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Williams JC, Faillace MS, Gonzalez EJ, Dominguez RE, Knappenberger K, Heredia DA, Moore TA, Moore AL, Allen JP. Mn-porphyrins in a four-helix bundle participate in photo-induced electron transfer with a bacterial reaction center. Photosynth Res 2023:10.1007/s11120-023-01051-9. [PMID: 37910331 DOI: 10.1007/s11120-023-01051-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 09/18/2023] [Indexed: 11/03/2023]
Abstract
Hybrid complexes incorporating synthetic Mn-porphyrins into an artificial four-helix bundle domain of bacterial reaction centers created a system to investigate new electron transfer pathways. The reactions were initiated by illumination of the bacterial reaction centers, whose primary photochemistry involves electron transfer from the bacteriochlorophyll dimer through a series of electron acceptors to the quinone electron acceptors. Porphyrins with diphenyl, dimesityl, or fluorinated substituents were synthesized containing either Mn or Zn. Electrochemical measurements revealed potentials for Mn(III)/Mn(II) transitions that are ~ 0.4 V higher for the fluorinated Mn-porphyrins than the diphenyl and dimesityl Mn-porphyrins. The synthetic porphyrins were introduced into the proteins by binding to a four-helix bundle domain that was genetically fused to the reaction center. Light excitation of the bacteriochlorophyll dimer of the reaction center resulted in new derivative signals, in the 400 to 450 nm region of light-minus-dark spectra, that are consistent with oxidation of the fluorinated Mn(II) porphyrins and reduction of the diphenyl and dimesityl Mn(III) porphyrins. These features recovered in the dark and were not observed in the Zn(II) porphyrins. The amplitudes of the signals were dependent upon the oxidation/reduction midpoint potentials of the bacteriochlorophyll dimer. These results are interpreted as photo-induced charge-separation processes resulting in redox changes of the Mn-porphyrins, demonstrating the utility of the hybrid artificial reaction center system to establish design guidelines for novel electron transfer reactions.
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Affiliation(s)
- J C Williams
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287, USA
| | - M S Faillace
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287, USA
| | - E J Gonzalez
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287, USA
| | - R E Dominguez
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287, USA
| | - K Knappenberger
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287, USA
| | - D A Heredia
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287, USA
| | - T A Moore
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287, USA
| | - A L Moore
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287, USA
| | - J P Allen
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287, USA.
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2
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Allen JP, Chamberlain KD, Williams JC. Identification of amino acid residues in a proton release pathway near the bacteriochlorophyll dimer in reaction centers from Rhodobacter sphaeroides. Photosynth Res 2023; 155:23-34. [PMID: 36197600 DOI: 10.1007/s11120-022-00968-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 09/21/2022] [Indexed: 06/16/2023]
Abstract
Insight into control of proton transfer, a crucial attribute of cellular functions, can be gained from investigations of bacterial reaction centers. While the uptake of protons associated with the reduction of the quinone is well characterized, the release of protons associated with the oxidized bacteriochlorophyll dimer has been poorly understood. Optical spectroscopy and proton release/uptake measurements were used to examine the proton release characteristics of twelve mutant reaction centers, each containing a change in an amino acid residue near the bacteriochlorophyll dimer. The mutant reaction centers had optical spectra similar to wild-type and were capable of transferring electrons to the quinones after light excitation of the bacteriochlorophyll dimer. They exhibited a large range in the extent of proton release and in the slow recovery of the optical signal for the oxidized dimer upon continuous illumination. Key roles were indicated for six amino acid residues, Thr L130, Asp L155, Ser L244, Arg M164, Ser M190, and His M193. Analysis of the results points to a hydrogen-bond network that contains these residues, with several additional residues and bound water molecules, forming a proton transfer pathway. In addition to proton transfer, the properties of the pathway are proposed to be responsible for the very slow charge recombination kinetics observed after continuous illumination. The characteristics of this pathway are compared to proton transfer pathways near the secondary quinone as well as those found in photosystem II and cytochrome c oxidase.
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Affiliation(s)
- J P Allen
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287-1604, USA.
| | - K D Chamberlain
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - J C Williams
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287-1604, USA
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3
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Espiritu E, Chamberlain KD, Williams JC, Allen JP. Bound manganese oxides capable of reducing the bacteriochlorophyll dimer of modified reaction centers from Rhodobacter sphaeroides. Photosynth Res 2020; 143:129-141. [PMID: 31641987 DOI: 10.1007/s11120-019-00680-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 10/09/2019] [Indexed: 06/10/2023]
Abstract
A biohybrid model system is described that interfaces synthetic Mn-oxides with bacterial reaction centers to gain knowledge concerning redox reactions by metal clusters in proteins, in particular the Mn4CaO5 cluster of photosystem II. The ability of Mn-oxides to bind to modified bacterial reaction centers and transfer an electron to the light-induced oxidized bacteriochlorophyll dimer, P+, was characterized using optical spectroscopy. The environment of P was altered to obtain a high P/P+ midpoint potential. In addition, different metal-binding sites were introduced by substitution of amino acid residues as well as extension of the C-terminus of the M subunit with the C-terminal region of the D1 subunit of photosystem II. The Mn-compounds MnO2, αMn2O3, Mn3O4, CaMn2O4, and Mn3(PO4)2 were tested and compared to MnCl2. In general, addition of the Mn-compounds resulted in a decrease in the amount of P+ while the reduced quinone was still present, demonstrating that the Mn-compounds can serve as secondary electron donors. The extent of P+ reduction for the Mn-oxides was largest for αMn2O3 and CaMn2O4 and smallest for Mn3O4 and MnO2. The addition of Mn3(PO4)2 resulted in nearly complete P+ reduction, similar to MnCl2. Overall, the activity was correlated with the initial oxidation state of the Mn-compound. Transient optical measurements showed a fast kinetic component, assigned to reduction of P+ by the Mn-oxide, in addition to a slow component due to charge recombination. The results support the conjecture that the incorporation of Mn-oxides by ancient anoxygenic phototrophs was a step in the evolution of oxygenic photosynthesis.
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Affiliation(s)
- Eduardo Espiritu
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - Kori D Chamberlain
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - JoAnn C Williams
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - James P Allen
- School of Molecular Sciences, Arizona State University, Tempe, AZ, 85287-1604, USA.
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Khmelnitskiy A, Williams JC, Allen JP, Jankowiak R. Influence of Hydrogen Bonds on the Electron-Phonon Coupling Strength/Marker Mode Structure and Charge Separation Rates in Reaction Centers from Rhodobacter sphaeroides. J Phys Chem B 2019; 123:8717-8726. [PMID: 31539255 DOI: 10.1021/acs.jpcb.9b08388] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Low-temperature persistent and transient hole-burning (HB) spectra are presented for the triple hydrogen-bonded L131LH + M160LH + M197FH mutant of Rhodobacter sphaeroides. These spectra expose the heterogeneous nature of the P-, B-, and H-bands, consistent with a distribution of electron transfer (ET) times and excitation energy transfer (EET) rates. Transient P+QA- holes are observed for fast (tens of picoseconds or faster) ET times and reveal strong coupling to phonons and marker mode(s), while the persistent holes are bleached in a fraction of reaction centers with long-lived excited states characterized by much weaker electron-phonon coupling. Exposed differences in electron-phonon coupling strength, as well as a different coupling to the marker mode(s), appear to affect the ET times. Both resonantly and nonresonantly burned persistent HB spectra show weak blue- (∼150 cm-1) and large, red-shifted (∼300 cm-1) antiholes of the P band. Slower EET times from the H- and B-bands to the special pair dimer provide new insight on the influence of hydrogen bonds on mutation-induced heterogeneity.
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Affiliation(s)
| | - JoAnn C Williams
- School of Molecular Sciences , Arizona State University , Tempe , Arizona 85287 , United States
| | - James P Allen
- School of Molecular Sciences , Arizona State University , Tempe , Arizona 85287 , United States
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Mandal S, Espiritu E, Akram N, Lin S, Williams JC, Allen JP, Woodbury NW. Influence of the Electrochemical Properties of the Bacteriochlorophyll Dimer on Triplet Energy-Transfer Dynamics in Bacterial Reaction Centers. J Phys Chem B 2018; 122:10097-10107. [PMID: 30351114 DOI: 10.1021/acs.jpcb.8b07985] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Energetics, protein dynamics, and electronic coupling are the key factors in controlling both electron and energy transfer in photosynthetic bacterial reaction centers (RCs). Here, we examine the rates and mechanistic pathways of the P+HA- radical-pair charge recombination, triplet state formation, and subsequent triplet energy transfer from the triplet state of the bacteriochlorophyll dimer (P) to the carotenoid in a series of mutant RCs (L131LH + M160LH (D1), L131LH + M197FH (D2), and L131LH + M160LH + M197FH (T1)) of Rhodobacter sphaeroides. In these mutants, the electronic structure of P is perturbed and the P/P+ midpoint potential is systematically increased due to addition of hydrogen bonds between P and the introduced residues. High-resolution, broad-band, transient absorption spectroscopy on the femtosecond to microsecond timescale shows that the charge recombination rate increases and the triplet energy transfer rate decreases in these mutants relative to the wild type (WT). The increase of the charge recombination rate is correlated to the increase in the energy level of P+HA- and the increase in the P/P+ midpoint potential. On the other hand, the decrease in rate of triplet energy transfer in the mutants can be explained in terms of a lower energy of 3P and a shift in the electron spin density distribution in the bacteriochlorophylls of P. The triplet energy-transfer rate follows the order of WT > L131LH + M197FH > L131LH + M160LH > L131LH + M160LH + M197FH, both at room temperature and at 77 K. A pronounced temperature dependence of the rate is observed for all of the RC samples. The activation energy associated to this process is increased in the mutants relative to WT, consistent with a lower 3P energy due to the addition of hydrogen bonds between P and the introduced residues.
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Wang YN, Kreider W, Hunter C, Cunitz BW, Thiel J, Starr F, Dai JC, Nazari Y, Lee D, Williams JC, Bailey MR, Maxwell AD. An in vivo demonstration of efficacy and acute safety of burst wave lithotripsy using a porcine model. Proc Meet Acoust 2018; 35:020009. [PMID: 32612743 PMCID: PMC7329000 DOI: 10.1121/2.0000975] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Burst wave lithotripsy (BWL) is a new non-invasive method for stone comminution using bursts of sub-megahertz ultrasound. A porcine model of urolithiasis and techniques to implement BWL treatment has been developed to evaluate its effectiveness and acute safety. Six human calcium oxalate monohydrate stones (6-7 mm) were hydrated, weighed, and surgically implanted into the kidneys of three pigs. Transcutaneous stone treatments were performed with a BWL transducer coupled to the skin via an external water bath. Stone targeting and treatment monitoring were performed with a co-aligned ultrasound imaging probe. Treatment exposures were applied in three 10-minute intervals for each stone. If sustained cavitation in the parenchyma was observed by ultrasound imaging feedback, treatment was paused and the pressure amplitude was decreased for the remaining time. Peak negative focal pressures between 6.5 and 7 MPa were applied for all treatments. After treatment, stone fragments were removed from the kidneys. At least 50% of each stone was reduced to <2 mm fragments. 100% of four stones were reduced to <4 mm fragments. Magnetic resonance imaging showed minimal injury to the functional renal volume. This study demonstrated that BWL could be used to effectively fragment kidney stones with minimal injury.
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Affiliation(s)
- Y-N Wang
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, 1013 NE 40th St., Seattle, WA 98105, USA
| | - W Kreider
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, 1013 NE 40th St., Seattle, WA 98105, USA
| | - C Hunter
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, 1013 NE 40th St., Seattle, WA 98105, USA
| | - B W Cunitz
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, 1013 NE 40th St., Seattle, WA 98105, USA
| | - J Thiel
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, 1013 NE 40th St., Seattle, WA 98105, USA
| | - F Starr
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, 1013 NE 40th St., Seattle, WA 98105, USA
| | - J C Dai
- Department of Urology, University of Washington School of Medicine, 1959 NE Pacific Street, Box 356510, Seattle, WA 98195
| | - Y Nazari
- Department of Radiology, University of Washington School of Medicine, 1959 NE Pacific Street, Box 356510, Seattle, WA 98195
| | - D Lee
- Department of Radiology, University of Washington School of Medicine, 1959 NE Pacific Street, Box 356510, Seattle, WA 98195
| | - J C Williams
- Department of Biostatistics, Indiana University-Purdue University Indianapolis, 410 W. Tenth St., Suite 3000., Indianapolis, IN 46202, USA
| | - M R Bailey
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, 1013 NE 40th St., Seattle, WA 98105, USA
| | - A D Maxwell
- Department of Urology, University of Washington School of Medicine, 1959 NE Pacific Street, Box 356510, Seattle, WA 98195
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Hunter C, Cunitz B, Dunmire B, Bailey M, Randad A, Kreider W, Maxwell AD, Sorensen MD, Williams JC. Impact of stone characteristics on cavitation in burst wave lithotripsy. Proc Meet Acoust 2018; 35:020005. [PMID: 32612739 PMCID: PMC7328948 DOI: 10.1121/2.0000950] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Non-invasive kidney stone treatments such as shock wave lithotripsy (SWL) and burst wave lithotripsy (BWL) rely on the delivery of pressure waves through tissue to the stone. In both SWL and BWL, the potential to hinder comminution by exciting cavitation proximal to the stone has been reported. To elucidate how different stones alter prefocal cavitation in BWL, different natural and synthetic stones were treated in vitro using a therapy transducer operating at 350 kHz (peak negative pressure 7 MPa, pulse length 20 cycles, pulse repetition frequency 10 Hz). Stones were held in a confined volume of water designed to mimic the geometry of a kidney calyx, with the water filtered and degassed to maintain conditions for which the cavitation threshold (in the absence of a stone) matches that from in vivo observations. Stone targeting and cavitation monitoring were performed via ultrasound imaging using a diagnostic probe aligned coaxially with the therapy transducer. Quantitative differences in the extent and location of cavitation activity were observed for different stone types-e.g., "softer" stones (natural and synthetic) that disintegrate into "dusty" fragments produced larger prefocal cavitation clouds. Future work will focus on correlation of such cavitation metrics with stone fragmentation.
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Affiliation(s)
- C Hunter
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, Seattle, Washington, UNITED STATES
| | - B Cunitz
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, Seattle, Washington, UNITED STATES
| | - B Dunmire
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, Seattle, Washington, UNITED STATES
| | - M Bailey
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, Seattle, Washington, UNITED STATES
| | - A Randad
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, Seattle, Washington, UNITED STATES
| | - W Kreider
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, Seattle, Washington, UNITED STATES
| | - A D Maxwell
- Department of Urology, University of Washington School of Medicine, Seattle, Washington, UNITED STATES
| | - M D Sorensen
- Department of Urology, University of Washington School of Medicine, Seattle, Washington, UNITED STATES
| | - J C Williams
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana, UNITED STATES
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Abstract
A histopathological study is reported of the autopsy findings in two strains of rats treated with N-methyl-N-nitrosourea (MNU). The induced mammary tumours were histologically indistinguishable from those produced by dimethylbenz(a)anthracene (DMBA). A number of other primary tumours were found and there was no evidence of metastases.
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Espiritu E, Olson TL, Williams JC, Allen JP. Binding and Energetics of Electron Transfer between an Artificial Four-Helix Mn-Protein and Reaction Centers from Rhodobacter sphaeroides. Biochemistry 2017; 56:6460-6469. [PMID: 29131579 DOI: 10.1021/acs.biochem.7b00978] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ability of an artificial four-helix bundle Mn-protein, P1, to bind and transfer an electron to photosynthetic reaction centers from the purple bacterium Rhodobacter sphaeroides was characterized using optical spectroscopy. Upon illumination of reaction centers, an electron is transferred from P, the bacteriochlorophyll dimer, to QA, the primary electron acceptor. The P1 Mn-protein can bind to the reaction center and reduce the oxidized bacteriochlorophyll dimer, P+, with a dissociation constant of 1.2 μM at pH 9.4, comparable to the binding constant of c-type cytochromes. Amino acid substitutions of surface residues on the Mn-protein resulted in increases in the dissociation constant to 8.3 μM. The extent of reduction of P+ by the P1 Mn-protein was dependent on the P/P+ midpoint potential and the pH. Analysis of the free energy difference yielded a midpoint potential of approximately 635 mV at pH 9.4 for the Mn cofactor of the P1 Mn-protein, a value similar to those found for other Mn cofactors in proteins. The linear dependence of -56 mV/pH is consistent with one proton being released upon Mn oxidation, allowing the complex to maintain overall charge neutrality. These outcomes demonstrate the feasibility of designing four-helix bundles and other artificial metalloproteins to bind and transfer electrons to bacterial reaction centers and establish the usefulness of this system as a platform for designing sites to bind novel metal cofactors capable of performing complex oxidation-reduction reactions.
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Affiliation(s)
- Eduardo Espiritu
- School of Molecular Sciences, Arizona State University , Tempe, Arizona 85287-1604, United States
| | - Tien L Olson
- School of Molecular Sciences, Arizona State University , Tempe, Arizona 85287-1604, United States
| | - JoAnn C Williams
- School of Molecular Sciences, Arizona State University , Tempe, Arizona 85287-1604, United States
| | - James P Allen
- School of Molecular Sciences, Arizona State University , Tempe, Arizona 85287-1604, United States
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Olson TL, Espiritu E, Edwardraja S, Canarie E, Flores M, Williams JC, Ghirlanda G, Allen JP. Biochemical and spectroscopic characterization of dinuclear Mn-sites in artificial four-helix bundle proteins. Biochim Biophys Acta Bioenerg 2017; 1858:945-954. [PMID: 28882760 DOI: 10.1016/j.bbabio.2017.08.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 08/28/2017] [Accepted: 08/31/2017] [Indexed: 01/18/2023]
Abstract
To better understand metalloproteins with Mn-clusters, we have designed artificial four-helix bundles to have one, two, or three dinuclear metal centers able to bind Mn(II). Circular dichroism measurements showed that the Mn-proteins have substantial α-helix content, and analysis of electron paramagnetic resonance spectra is consistent with the designed number of bound Mn-clusters. The Mn-proteins were shown to catalyze the conversion of hydrogen peroxide into molecular oxygen. The loss of hydrogen peroxide was dependent upon the concentration of protein with bound Mn, with the proteins containing multiple Mn-clusters showing greater activity. Using an oxygen sensor, the oxygen concentration was found to increase with a rate up to 0.4μM/min, which was dependent upon the concentrations of hydrogen peroxide and the Mn-protein. In addition, the Mn-proteins were shown to serve as electron donors to bacterial reaction centers using optical spectroscopy. Similar binding of the Mn-proteins to reaction centers was observed with an average dissociation constant of 2.3μM. The Mn-proteins with three metal centers were more effective at this electron transfer reaction than the Mn-proteins with one or two metal centers. Thus, multiple Mn-clusters can be incorporated into four-helix bundles with the capability of performing catalysis and electron transfer to a natural protein.
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Affiliation(s)
- Tien L Olson
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA
| | - Eduardo Espiritu
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA
| | | | - Elizabeth Canarie
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA
| | - Marco Flores
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA
| | - JoAnn C Williams
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA
| | - Giovanna Ghirlanda
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA
| | - James P Allen
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA.
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Mandal S, Carey AM, Locsin J, Gao BR, Williams JC, Allen JP, Lin S, Woodbury NW. Mechanism of Triplet Energy Transfer in Photosynthetic Bacterial Reaction Centers. J Phys Chem B 2017; 121:6499-6510. [DOI: 10.1021/acs.jpcb.7b03373] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Sarthak Mandal
- Center
for Innovations in Medicine, The Biodesign Institute at ASU, Arizona State University, Tempe, Arizona 85287, United States
| | - Anne-Marie Carey
- Center
for Innovations in Medicine, The Biodesign Institute at ASU, Arizona State University, Tempe, Arizona 85287, United States
| | - Joshua Locsin
- Center
for Innovations in Medicine, The Biodesign Institute at ASU, Arizona State University, Tempe, Arizona 85287, United States
| | | | - JoAnn C. Williams
- School
of Molecular Sciences, Arizona State University, Tempe, Arizona 85287−1604, United States
| | - James P. Allen
- School
of Molecular Sciences, Arizona State University, Tempe, Arizona 85287−1604, United States
| | - Su Lin
- Center
for Innovations in Medicine, The Biodesign Institute at ASU, Arizona State University, Tempe, Arizona 85287, United States
- School
of Molecular Sciences, Arizona State University, Tempe, Arizona 85287−1604, United States
| | - Neal W. Woodbury
- Center
for Innovations in Medicine, The Biodesign Institute at ASU, Arizona State University, Tempe, Arizona 85287, United States
- School
of Molecular Sciences, Arizona State University, Tempe, Arizona 85287−1604, United States
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12
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Williams JC, Clements S. Making time for what's important: what elements should we value when planning practice-based professional training? Br Dent J 2016; 221:109-11. [PMID: 27514338 DOI: 10.1038/sj.bdj.2016.552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/10/2016] [Indexed: 11/09/2022]
Abstract
Newly qualified professional healthcare graduates, whether training to become doctors, dentists, veterinary surgeons or nurses, tend to need some support as they take their first steps along that bumpy road from university to confident, competent practice. We identify some key features of the UK programme of dental practice-based training to acknowledge its strengths - 12 months of clinical practice within a well-established dental team, one-to-one weekly meetings with the same dedicated mentor, regular peer learning with the same group of peers over 12 months and the opportunity to observe role models from the profession including training programme directors and other general dental practitioners (GDPs). This educational programme is unique to dentistry and this article outlines why we believe it is important to value these features when designing postgraduate professional training in healthcare sciences.
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Affiliation(s)
- J C Williams
- Department of Orthodontics, University of Bristol, School of Oral and Dental Health Sciences, Lower Maudlin Street, Bristol, BS1 2LY
| | - S Clements
- Castle Dental Care, Tangmere Square, Castle Vale, Birmingham, B35 6DL
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13
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Olson TL, Espiritu E, Edwardraja S, Simmons CR, Williams JC, Ghirlanda G, Allen JP. Design of dinuclear manganese cofactors for bacterial reaction centers. Biochim Biophys Acta 2015; 1857:539-547. [PMID: 26392146 DOI: 10.1016/j.bbabio.2015.09.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 09/14/2015] [Indexed: 12/28/2022]
Abstract
A compelling target for the design of electron transfer proteins with novel cofactors is to create a model for the oxygen-evolving complex, a Mn4Ca cluster, of photosystem II. A mononuclear Mn cofactor can be added to the bacterial reaction center, but the addition of multiple metal centers is constrained by the native protein architecture. Alternatively, metal centers can be incorporated into artificial proteins. Designs for the addition of dinuclear metal centers to four-helix bundles resulted in three artificial proteins with ligands for one, two, or three dinuclear metal centers able to bind Mn. The three-dimensional structure determined by X-ray crystallography of one of the Mn-proteins confirmed the design features and revealed details concerning coordination of the Mn center. Electron transfer between these artificial Mn-proteins and bacterial reaction centers was investigated using optical spectroscopy. After formation of a light-induced, charge-separated state, the experiments showed that the Mn-proteins can donate an electron to the oxidized bacteriochlorophyll dimer of modified reaction centers, with the Mn-proteins having additional metal centers being more effective at this electron transfer reaction. Modeling of the structure of the Mn-protein docked to the reaction center showed that the artificial protein likely binds on the periplasmic surface similarly to cytochrome c2, the natural secondary donor. Combining reaction centers with exogenous artificial proteins provides the opportunity to create ligands and investigate the influence of inhomogeneous protein environments on multinuclear redox-active metal centers. This article is part of a Special Issue entitled Biodesign for Bioenergetics--the design and engineering of electronic transfer cofactors, proteins and protein networks, edited by Ronald L. Koder and J.L. Ross Anderson.
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Affiliation(s)
- Tien L Olson
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA
| | - Eduardo Espiritu
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA
| | | | - Chad R Simmons
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA
| | - JoAnn C Williams
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA
| | - Giovanna Ghirlanda
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA
| | - James P Allen
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA.
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Flores M, Olson TL, Wang D, Edwardraja S, Shinde S, Williams JC, Ghirlanda G, Allen JP. Copper Environment in Artificial Metalloproteins Probed by Electron Paramagnetic Resonance Spectroscopy. J Phys Chem B 2015. [DOI: 10.1021/acs.jpcb.5b04172] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Marco Flores
- Department
of Chemistry and
Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - Tien L. Olson
- Department
of Chemistry and
Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - Dong Wang
- Department
of Chemistry and
Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - Selvakumar Edwardraja
- Department
of Chemistry and
Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - Sandip Shinde
- Department
of Chemistry and
Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - JoAnn C. Williams
- Department
of Chemistry and
Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - Giovanna Ghirlanda
- Department
of Chemistry and
Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - James P. Allen
- Department
of Chemistry and
Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
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15
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Abstract
The presentation of alternative treatment plans and the discussion of these options with the adolescent patient is a routine part of both general dental and specialist orthodontic practice. This article will cover the issues involved in obtaining consent for treatment from the adolescent patient and suggests a practical means, if appropriate, to ensure that these patients can give and withdraw consent for their own treatment.
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Affiliation(s)
- J C Williams
- School of Oral and Dental Sciences, University of Bristol and Royal United Hospitals, Bath
| | - N E Atack
- Bristol Dental Hospital, UH Bristol NHS Foundation Trust and Musgrove Park Hospital, Taunton
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16
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Pardaev SA, Williams JC, Twieg RJ, Jakli A, Gleeson JT, Ellman B, Sprunt S. Polar structure of disclination loops in nematic liquid crystals probed by second-harmonic-light scattering. Phys Rev E Stat Nonlin Soft Matter Phys 2015; 91:032501. [PMID: 25871132 DOI: 10.1103/physreve.91.032501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Indexed: 06/04/2023]
Abstract
Angle-resolved, second-harmonic-light scattering (SHLS) measurements are reported for three different classes of thermotropic nematic liquid crystals (NLCs): polar and nonpolar rodlike compounds and a bent-core compound. Results revealing well-defined scattering peaks are interpreted in terms of the electric polarization induced by distortions of the nematic orientational field ("flexopolarity") associated with inversion wall defects, nonsingular disclinations, analogous to Neel walls in ferromagnets, that often exhibit a closed loop morphology in NLCs. Analysis of the SHLS patterns based on this model provides a "proof-of-concept" for a potentially useful method to probe the flexopolar properties of NLCs.
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Affiliation(s)
- Shokir A Pardaev
- Department of Physics, Kent State University, Kent, Ohio 44242, USA
| | - J C Williams
- Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44242, USA
| | - R J Twieg
- Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44242, USA
| | - A Jakli
- Chemical Physics Interdisciplinary Program and Liquid Crystal Institute, Kent State University, Kent, OH 44242, USA
| | - J T Gleeson
- Department of Physics, Kent State University, Kent, Ohio 44242, USA
| | - B Ellman
- Department of Physics, Kent State University, Kent, Ohio 44242, USA
| | - S Sprunt
- Department of Physics, Kent State University, Kent, Ohio 44242, USA
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17
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Olson TL, Williams JC, Allen JP. The three-dimensional structures of bacterial reaction centers. Photosynth Res 2014; 120:87-98. [PMID: 23575738 DOI: 10.1007/s11120-013-9821-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2013] [Accepted: 03/27/2013] [Indexed: 06/02/2023]
Abstract
This review presents a broad overview of the research that enabled the structure determination of the bacterial reaction centers from Blastochloris viridis and Rhodobacter sphaeroides, with a focus on the contributions from Duysens, Clayton, and Feher. Early experiments performed in the laboratory of Duysens and others demonstrated the utility of spectroscopic techniques and the presence of photosynthetic complexes in both oxygenic and anoxygenic photosynthesis. The laboratories of Clayton and Feher led efforts to isolate and characterize the bacterial reaction centers. The availability of well-characterized preparations of pure and stable reaction centers allowed the crystallization and subsequent determination of the structures using X-ray diffraction. The three-dimensional structures of reaction centers revealed an overall arrangement of two symmetrical branches of cofactors surrounded by transmembrane helices from the L and M subunits, which also are related by the same twofold symmetry axis. The structure has served as a framework to address several issues concerning bacterial photosynthesis, including the directionality of electron transfer, the properties of the reaction center-cytochrome c 2 complex, and the coupling of proton and electron transfer. Together, these research efforts laid the foundation for ongoing efforts to address an outstanding question in oxygenic photosynthesis, namely the molecular mechanism of water oxidation.
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Affiliation(s)
- T L Olson
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ, 85287-1604, USA
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18
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Tufts AA, Flores M, Olson TL, Williams JC, Allen JP. Electronic structure of the Mn-cofactor of modified bacterial reaction centers measured by electron paramagnetic resonance and electron spin echo envelope modulation spectroscopies. Photosynth Res 2014; 120:207-220. [PMID: 23868400 DOI: 10.1007/s11120-013-9887-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Accepted: 07/06/2013] [Indexed: 06/02/2023]
Abstract
The electronic structure of a Mn(II) ion bound to highly oxidizing reaction centers of Rhodobacter sphaeroides was studied in a mutant modified to possess a metal binding site at a location comparable to the Mn4Ca cluster of photosystem II. The Mn-binding site of the previously described mutant, M2, contains three carboxylates and one His at the binding site (Thielges et al., Biochemistry 44:389-7394, 2005). The redox-active Mn-cofactor was characterized using electron paramagnetic resonance (EPR) and electron spin echo envelope modulation (ESEEM) spectroscopies. In the light without bound metal, the Mn-binding mutants showed an EPR spectrum characteristic of the oxidized bacteriochlorophyll dimer and reduced quinone whose intensity was significantly reduced due to the diminished quantum yield of charge separation in the mutant compared to wild type. In the presence of the metal and in the dark, the EPR spectrum measured at the X-band frequency of 9.4 GHz showed a distinctive spin 5/2 Mn(II) signal consisting of 16 lines associated with both allowed and forbidden transitions. Upon illumination, the amplitude of the spectrum is decreased by over 80 % due to oxidation of the metal upon electron transfer to the oxidized bacteriochlorophyll dimer. The EPR spectrum of the Mn-cofactor was also measured at the Q-band frequency of 34 GHz and was better resolved as the signal was composed of the six allowed electronic transitions with only minor contributions from other transitions. A fit of the Q-band EPR spectrum shows that the Mn-cofactor is a high spin Mn(II) species (S = 5/2) that is six-coordinated with an isotropic g-value of 2.0006, a weak zero-field splitting and E/D ratio of approximately 1/3. The ESEEM experiments showed the presence of one (14)N coordinating the Mn-cofactor. The nitrogen atom is assigned to a His by comparing our ESEEM results to those previously reported for Mn(II) ions bound to other proteins and on the basis of the X-ray structure of the M2 mutant that shows the presence of only one His, residue M193, that can coordinate the Mn-cofactor. Together, the data allow the electronic structure and coordination environment of the designed Mn-cofactor in the modified reaction centers to be characterized in detail and compared to those observed in other proteins with Mn-cofactors.
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Affiliation(s)
- A A Tufts
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ, 85287-1604, USA
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19
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Kuang L, Olson TL, Lin S, Flores M, Jiang Y, Zheng W, Williams JC, Allen JP, Liang H. Interface for Light-Driven Electron Transfer by Photosynthetic Complexes Across Block Copolymer Membranes. J Phys Chem Lett 2014; 5:787-791. [PMID: 26274068 DOI: 10.1021/jz402766y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Incorporation of membrane proteins into nanodevices to mediate recognition and transport in a collective and scalable fashion remains a challenging problem. We demonstrate how nanoscale photovoltaics could be designed using robust synthetic nanomembranes with incorporated photosynthetic reaction centers (RCs). Specifically, RCs from Rhodobacter sphaeroides are reconstituted spontaneously into rationally designed polybutadiene membranes to form hierarchically organized proteopolymer membrane arrays via a charge-interaction-directed reconstitution mechanism. Once incorporated, the RCs are fully active for prolonged periods based upon a variety of spectroscopic measurements, underscoring preservation of their 3D pigment configuration critical for light-driven charge transfer. This result provides a strategy to construct solar conversion devices using structurally versatile proteopolymer membranes with integrated RC functions to harvest broad regions of the solar spectrum.
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Affiliation(s)
- Liangju Kuang
- †Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Tien L Olson
- ‡Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Su Lin
- ‡Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Marco Flores
- ‡Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Yunjiang Jiang
- †Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Wan Zheng
- †Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| | - JoAnn C Williams
- ‡Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - James P Allen
- ‡Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Hongjun Liang
- †Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
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20
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Olson TL, Williams JC, Allen JP. Influence of protein interactions on oxidation/reduction midpoint potentials of cofactors in natural and de novo metalloproteins. Biochim Biophys Acta 2013; 1827:914-22. [PMID: 23466333 DOI: 10.1016/j.bbabio.2013.02.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 02/13/2013] [Accepted: 02/23/2013] [Indexed: 01/14/2023]
Abstract
As discussed throughout this special issue, oxidation and reduction reactions play critical roles in the function of many organisms. In photosynthetic organisms, the conversion of light energy drives oxidation and reduction reactions through the transfer of electrons and protons in order to create energy-rich compounds. These reactions occur in proteins such as cytochrome c, a heme-containing water-soluble protein, the bacteriochlorophyll-containing reaction center, and photosystem II where water is oxidized at the manganese cluster. A critical measure describing the ability of cofactors in proteins to participate in such reactions is the oxidation/reduction midpoint potential. In this review, the basic concepts of oxidation/reduction reactions are reviewed with a summary of the experimental approaches used to measure the midpoint potential of metal cofactors. For cofactors in proteins, the midpoint potential not only depends upon the specific chemical characteristics of cofactors but also upon interactions with the surrounding protein, such as the nature of the coordinating ligands and protein environment. These interactions can be tailored to optimize an oxidation/reduction reaction carried out by the protein. As examples, the midpoint potentials of hemes in cytochromes, bacteriochlorophylls in reaction centers, and the manganese cluster of photosystem II are discussed with an emphasis on the influence that protein interactions have on these potentials. This article is part of a Special Issue entitled: Metals in Bioenergetics and Biomimetics Systems.
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Affiliation(s)
- T L Olson
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604, USA
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21
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22
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Challa PK, Curtiss O, Williams JC, Twieg R, Toth J, McGill S, Jákli A, Gleeson JT, Sprunt SN. Light scattering from liquid crystal director fluctuations in steady magnetic fields up to 25 tesla. Phys Rev E Stat Nonlin Soft Matter Phys 2012; 86:011708. [PMID: 23005438 DOI: 10.1103/physreve.86.011708] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Indexed: 06/01/2023]
Abstract
We report on homodyne dynamic light scattering measurements of orientational fluctuation modes in both calamitic and bent-core nematic liquid crystals, carried out in the new split-helix resistive magnet at the National High Magnetic Field Laboratory. The relaxation rate and inverse scattered intensity of director fluctuations exhibit a linear dependence on field-squared up to 25 tesla, which is consistent with strictly lowest order coupling of the tensor order parameter Q to field (Q(αβ)B(α)B(β)) in the nematic free energy. However, we also observe evidence of field dependence of certain nematic material parameters, an effect which may be expected from the mean field scaling of these quantities with the magnitude of Q and the predicted variation of Q with field.
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Affiliation(s)
- Pavan K Challa
- Department of Physics, Kent State University, Kent, Ohio 44242, USA.
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23
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Buschke DG, Resto P, Schumacher N, Cox B, Tallavajhula A, Vivekanandan A, Eliceiri KW, Williams JC, Ogle BM. Microfluidic sorting of microtissues. Biomicrofluidics 2012; 6:14116-1411611. [PMID: 22505992 PMCID: PMC3324260 DOI: 10.1063/1.3692765] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2011] [Accepted: 02/12/2012] [Indexed: 05/31/2023]
Abstract
Increasingly, invitro culture of adherent cell types utilizes three-dimensional (3D) scaffolds or aggregate culture strategies to mimic tissue-like, microenvironmental conditions. In parallel, new flow cytometry-based technologies are emerging to accurately analyze the composition and function of these microtissues (i.e., large particles) in a non-invasive and high-throughput way. Lacking, however, is an accessible platform that can be used to effectively sort or purify large particles based on analysis parameters. Here we describe a microfluidic-based, electromechanical approach to sort large particles. Specifically, sheath-less asymmetric curving channels were employed to separate and hydrodynamically focus particles to be analyzed and subsequently sorted. This design was developed and characterized based on wall shear stress, tortuosity of the flow path, vorticity of the fluid in the channel, sorting efficiency and enrichment ratio. The large particle sorting device was capable of purifying fluorescently labelled embryoid bodies (EBs) from unlabelled EBs with an efficiency of 87.3% ± 13.5%, and enrichment ratio of 12.2 ± 8.4 (n = 8), while preserving cell viability, differentiation potential, and long-term function.
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24
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Kálmán L, Haffa ALM, Williams JC, Woodbury NW, Allen JP. Reduction of the oxidized bacteriochlorophyll dimer in reaction centers by ferrocene is dependent upon the driving force. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424607000266] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The rates of electron transfer from ferrocene to the oxidized bacteriochlorophyll dimer, P , in reaction centers from the purple photosynthetic bacterium Rhodobacter sphaeroides, were measured for a series of mutants in which the P / P + midpoint potentials range from 410 to 765 mV (Lin et al. Proc. Natl. Acad. Sci. USA 1994; 91: 10265-10269). The observed rate constant for each mutant was found to be linearly dependent upon the ferrocene concentration up to 50 μM. The electron transfer is described as a second order reaction with rate constants increasing from 1.5 to 35 × 106 M -1. s -1 with increasing P / P + midpoint potential. This dependence was tested for three additional mutants, each of which exhibits a pH dependence of the P / P + midpoint potential due to an electrostatic interaction with an introduced carboxylic group (Williams et al. Biochemistry 2001; 40: 15403-15407). For these mutants, the pH dependence of the bimolecular rate constants followed a sigmoidal pattern that could be described with a Henderson-Hasselbalch equation, attributable to the change of the free energy difference for the reaction due to deprotonation of the introduced carboxylic side chains.
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Affiliation(s)
- László Kálmán
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA
- Department of Physics, Concordia University, 7141 Sherbrooke West, Montreal, Quebec H4B 1R6, Canada
| | - Arlene L. M. Haffa
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA
| | - JoAnn C. Williams
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA
| | - Neal W. Woodbury
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA
| | - James P. Allen
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA
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25
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Evan AP, Unwin RJ, Williams JC. Renal stone disease: a commentary on the nature and significance of Randall's plaque. Nephron Clin Pract 2011; 119:p49-53. [PMID: 21952643 DOI: 10.1159/000330255] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Accepted: 06/16/2011] [Indexed: 11/19/2022] Open
Affiliation(s)
- A P Evan
- Indiana University School of Medicine, Indianapolis, IN 46202-5120, USA
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26
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Williams JC, Thorell WE, Treves JS, Fidler ME, Moore GF, Leibrock LG. Giant cell reparative granuloma of the petrous temporal bone: a case report and literature review. Skull Base Surg 2011; 10:89-93. [PMID: 17171108 PMCID: PMC1656763 DOI: 10.1055/s-2000-7276] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Giant cell reparative granuloma (GCRG) is an unusual, benign bone lesion that most commonly affects the maxilla and mandible; skull involvement is rare. The etiology is uncertain but may be related to trauma. GCRG is difficult to distinguish from giant cell tumor of the bone and has a lower recurrence rate. Thirteen reports of temporal bone GCRG in 11 patients have been reported. One report of a petrous GCRG in a 3-year-old girl has been identified. A 38-year-old male presented with a 2-year history of fullness in his left ear, ipsilateral hearing loss, and intermittent cacosmia. Computed tomography and magnetic resonance imaging revealed a large left-sided anterior temporal extradural mass. The patient underwent a left frontotemporal craniotomy and resection of a left temporal fossa tumor that involved the petrous and squamous parts of the temporal bone. The patient's post-operative course was uneventful, except for increased hearing loss secondary to opening of the epitympanum. Follow-up at one month revealed no other problems. Histopathology of the specimen was consistent with a giant cell reparative granuloma.
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27
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Pan J, Lin S, Allen JP, Williams JC, Frank HA, Woodbury NW. Carotenoid Excited-State Properties in Photosynthetic Purple Bacterial Reaction Centers: Effects of the Protein Environment. J Phys Chem B 2011; 115:7058-68. [DOI: 10.1021/jp200077e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jie Pan
- The Biodesign Institute at Arizona State University, Arizona State University, Tempe, Arizona 85287-5201, United States
| | - Su Lin
- The Biodesign Institute at Arizona State University, Arizona State University, Tempe, Arizona 85287-5201, United States
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - James P. Allen
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - JoAnn C. Williams
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - Harry A. Frank
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - Neal W. Woodbury
- The Biodesign Institute at Arizona State University, Arizona State University, Tempe, Arizona 85287-5201, United States
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
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28
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Barratt-Boyes BG, Lowe JB, Watt WJ, Cole DS, Williams JC. Initial Experiences with Extracorporeal Circulation in Intracardiac Surgery. Br Med J 2011; 2:1826-31. [PMID: 20789013 DOI: 10.1136/bmj.2.5216.1826] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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29
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Deshmukh SS, Williams JC, Allen JP, Kálmán L. Light-Induced Conformational Changes in Photosynthetic Reaction Centers: Redox-Regulated Proton Pathway near the Dimer. Biochemistry 2011; 50:3321-31. [DOI: 10.1021/bi200169y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sasmit S. Deshmukh
- Department of Physics, Concordia University, Montreal, Quebec H4B 1R6, Canada
| | - JoAnn C. Williams
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - James P. Allen
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - László Kálmán
- Department of Physics, Concordia University, Montreal, Quebec H4B 1R6, Canada
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Allen JP, Williams JC. The evolutionary pathway from anoxygenic to oxygenic photosynthesis examined by comparison of the properties of photosystem II and bacterial reaction centers. Photosynth Res 2011; 107:59-69. [PMID: 20449659 DOI: 10.1007/s11120-010-9552-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2009] [Accepted: 04/05/2010] [Indexed: 05/29/2023]
Abstract
In photosynthetic organisms, such as purple bacteria, cyanobacteria, and plants, light is captured and converted into energy to create energy-rich compounds. The primary process of energy conversion involves the transfer of electrons from an excited donor molecule to a series of electron acceptors in pigment-protein complexes. Two of these complexes, the bacterial reaction center and photosystem II, are evolutionarily related and structurally similar. However, only photosystem II is capable of performing the unique reaction of water oxidation. An understanding of the evolutionary process that lead to the development of oxygenic photosynthesis can be found by comparison of these two complexes. In this review, we summarize how insight is being gained by examination of the differences in critical functional properties of these complexes and by experimental efforts to alter pigment-protein interactions of the bacterial reaction center in order to enable it to perform reactions, such as amino acid and metal oxidation, observable in photosystem II.
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Affiliation(s)
- J P Allen
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604, USA.
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31
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Deshmukh SS, Williams JC, Allen JP, Kálmán L. Light-Induced Conformational Changes in Photosynthetic Reaction Centers: Dielectric Relaxation in the Vicinity of the Dimer. Biochemistry 2010; 50:340-8. [DOI: 10.1021/bi101496c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Sasmit S. Deshmukh
- Department of Physics, Concordia University, Montreal, Quebec H4B 1R6, Canada
| | - JoAnn C. Williams
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - James P. Allen
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States
| | - László Kálmán
- Department of Physics, Concordia University, Montreal, Quebec H4B 1R6, Canada
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32
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Hong SH, Williams JC, Twieg RJ, Jákli A, Gleeson J, Sprunt S, Ellman B. Second-harmonic generation in a bent-core nematic liquid crystal. Phys Rev E Stat Nonlin Soft Matter Phys 2010; 82:041710. [PMID: 21230298 DOI: 10.1103/physreve.82.041710] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2009] [Revised: 03/03/2010] [Indexed: 05/30/2023]
Abstract
Second-harmonic generation (SHG) is studied in the magnetically aligned nematic phase of a bent-core liquid crystal (BCN) and compared to similar measurements made on a conventional rodlike (calamitic) nematic compound. The second-harmonic (SH) light detected from both materials is predominantly due to scattering and therefore incoherent. Results on the calamitic are consistent with a polarization induced by ordinary director fluctuations in the nematic phase. However, the SH scattering collected in the BCN exhibits a different temperature and angular dependence. We discuss how these differences could arise from the effects of short-range correlated, smectic-C-type molecular clusters, which have been detected in recent studies on various BCN materials.
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Affiliation(s)
- S H Hong
- Department of Physics, Kent State University, Kent, Ohio 44242, USA
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Petrillo G, Vishnevskiy D, Zielinski M, Bhatti A, Demortier L, Goulianos K, Hatakeyama K, Lungu G, Mesropian C, Yan M, Atramentov O, Gershtein Y, Gray R, Halkiadakis E, Hidas D, Hits D, Lath A, Rose K, Schnetzer S, Somalwar S, Stone R, Thomas S, Cerizza G, Hollingsworth M, Spanier S, Yang ZC, York A, Asaadi J, Eusebi R, Gilmore J, Gurrola A, Kamon T, Khotilovich V, Montalvo R, Nguyen CN, Pivarski J, Safonov A, Sengupta S, Toback D, Weinberger M, Akchurin N, Bardak C, Damgov J, Jeong C, Kovitanggoon K, Lee SW, Mane P, Roh Y, Sill A, Volobouev I, Wigmans R, Yazgan E, Appelt E, Brownson E, Engh D, Florez C, Gabella W, Johns W, Kurt P, Maguire C, Melo A, Sheldon P, Velkovska J, Arenton MW, Balazs M, Buehler M, Conetti S, Cox B, Hirosky R, Ledovskoy A, Neu C, Yohay R, Gollapinni S, Gunthoti K, Harr R, Karchin PE, Mattson M, Milstène C, Sakharov A, Anderson M, Bachtis M, Bellinger JN, Carlsmith D, Dasu S, Dutta S, Efron J, Gray L, Grogg KS, Grothe M, Herndon M, Klabbers P, Klukas J, Lanaro A, Lazaridis C, Leonard J, Lomidze D, Loveless R, Mohapatra A, Polese G, Reeder D, Savin A, Smith WH, Swanson J, Weinberg M. First measurement of Bose-Einstein correlations in proton-proton collisions at √s=0.9 and 2.36 TeV at the LHC. Phys Rev Lett 2010; 105:032001. [PMID: 20867758 DOI: 10.1103/physrevlett.105.032001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2010] [Indexed: 05/29/2023]
Abstract
Bose-Einstein correlations have been measured using samples of proton-proton collisions at 0.9 and 2.36 TeV center-of-mass energies, recorded by the CMS experiment at the CERN Large Hadron Collider. The signal is observed in the form of an enhancement of pairs of same-sign charged particles with small relative four-momentum. The size of the correlated particle emission region is seen to increase significantly with the particle multiplicity of the event.
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J, Wöhri HK, Altsybeev I, Belotelov I, Bunin P, Finger M, Finger M, Golutvin I, Kamenev A, Karjavin V, Kozlov G, Lanev A, Moisenz P, Palichik V, Perelygin V, Shmatov S, Smirnov V, Volodko A, Zarubin A, Bondar N, Golovtsov V, Ivanov Y, Kim V, Levchenko P, Smirnov I, Sulimov V, Uvarov L, Vavilov S, Vorobyev A, Andreev Y, Gninenko S, Golubev N, Kirsanov M, Krasnikov N, Matveev V, Pashenkov A, Toropin A, Troitsky S, Epshteyn V, Gavrilov V, Ilina N, Kaftanov V, Kossov M, Krokhotin A, Kuleshov S, Oulianov A, Safronov G, Semenov S, Shreyber I, Stolin V, Vlasov E, Zhokin A, Boos E, Dubinin M, Dudko L, Ershov A, Gribushin A, Kodolova O, Lokhtin I, Obraztsov S, Petrushanko S, Sarycheva L, Savrin V, Snigirev A, Andreev V, Dremin I, Kirakosyan M, Rusakov SV, Vinogradov A, Azhgirey I, Bitioukov S, Datsko K, Grishin V, Kachanov V, Konstantinov D, Krychkine V, Petrov V, Ryutin R, Slabospitsky S, Sobol A, Sytine A, Tourtchanovitch L, Troshin S, Tyurin N, Uzunian A, Volkov A, Adzic P, Djordjevic M, Krpic D, Maletic D, Milosevic J, Puzovic J, Aguilar-Benitez M, Alcaraz Maestre J, Arce P, Battilana C, Calvo E, Cepeda M, Cerrada M, Chamizo Llatas M, Colino N, De La Cruz B, Diez Pardos C, Fernandez Bedoya C, Fernández Ramos JP, Ferrando A, Flix J, Fouz MC, Garcia-Abia P, Gonzalez Lopez O, Goy Lopez S, Hernandez JM, Josa MI, Merino G, Puerta Pelayo J, Redondo I, Romero L, Santaolalla J, Willmott C, Albajar C, de Trocóniz JF, Cuevas J, Fernandez Menendez J, Gonzalez Caballero I, Lloret Iglesias L, Vizan Garcia JM, Cabrillo IJ, Calderon A, Chuang SH, Diaz Merino I, Diez Gonzalez C, Duarte Campderros J, Fernandez M, Gomez G, Gonzalez Sanchez J, Gonzalez Suarez R, Jorda C, Lobelle Pardo P, Lopez Virto A, Marco J, Marco R, Martinez Rivero C, Martinez Ruiz del Arbol P, Matorras F, Rodrigo T, Ruiz Jimeno A, Scodellaro L, Sobron Sanudo M, Vila I, Vilar Cortabitarte R, Abbaneo D, Auffray E, Baillon P, Ball AH, Barney D, Beaudette F, Bell AJ, Bellan R, Benedetti D, Bernet C, Bialas W, Bloch P, Bocci A, Bolognesi S, Breuker H, Brona G, Bunkowski K, Camporesi T, Cano E, Cattai A, Cerminara G, Christiansen T, Coarasa Perez JA, Covarelli R, Curé B, Dahms T, De Roeck A, Elliott-Peisert A, Funk W, Gaddi A, Gennai S, Gerwig H, Gigi D, Gill K, Giordano D, Glege F, Gomez-Reino Garrido R, Gowdy S, Guiducci L, Hansen M, Hartl C, Harvey J, Hegner B, Henderson C, Hoffmann HF, Honma A, Innocente V, Janot P, Lecoq P, Leonidopoulos C, Lourenço C, Macpherson A, Mäki T, Malgeri L, Mannelli M, Masetti L, Mavromanolakis G, Meijers F, Mersi S, Meschi E, Moser R, Mozer MU, Mulders M, Nesvold E, Orsini L, Perez E, Petrilli A, Pfeiffer A, Pierini M, Pimiä M, Racz A, Rolandi G, Rovelli C, Rovere M, Ryjov V, Sakulin H, Schäfer C, Schwick C, Segoni I, Sharma A, Siegrist P, Simon M, Sphicas P, Spiga D, Spiropulu M, Stöckli F, Traczyk P, Tropea P, Tsirou A, Veres GI, Vichoudis P, Voutilainen M, Zeuner WD, Bertl W, Deiters K, Erdmann W, Gabathuler K, Horisberger R, Ingram Q, Kaestli HC, König S, Kotlinski D, Langenegger U, Meier F, Renker D, Rohe T, Sibille J, Starodumov A, Caminada L, Chen Z, Cittolin S, Dissertori G, Dittmar M, Eugster J, Freudenreich K, Grab C, Hervé A, Hintz W, Lecomte P, Lustermann W, Marchica C, Meridiani P, Milenovic P, Moortgat F, Nardulli A, Nessi-Tedaldi F, Pape L, Pauss F, Punz T, Rizzi A, Ronga FJ, Sala L, Sanchez AK, Sawley MC, Schinzel D, Sordini V, Stieger B, Tauscher L, Thea A, Theofilatos K, Treille D, Weber M, Wehrli L, Weng J, Amsler C, Chiochia V, De Visscher S, Ivova Rikova M, Millan Mejias B, Regenfus C, Robmann P, Rommerskirchen T, Schmidt A, Tsirigkas D, Wilke L, Chang YH, Chen KH, Chen WT, Go A, Kuo CM, Li SW, Lin W, Liu MH, Lu YJ, Wu JH, Yu SS, Bartalini P, Chang P, Chang YH, Chang YW, Chao Y, Chen KF, Hou WS, Hsiung Y, Kao KY, Lei YJ, Lin SW, Lu RS, Shiu JG, Tzeng YM, Ueno K, Wang CC, Wang M, Wei JT, Adiguzel A, Ayhan A, Bakirci MN, Cerci S, Demir Z, Dozen C, Dumanoglu I, Eskut E, Girgis S, Gökbulut G, Güler Y, Gurpinar E, Hos I, Kangal EE, Karaman T, Kayis Topaksu A, Nart A, Onengüt G, Ozdemir K, Ozturk S, Polatöz A, Sahin O, Sengul O, Sogut K, Tali B, Topakli H, Uzun D, Vergili LN, Vergili M, Zorbilmez C, Akin IV, Aliev T, Bilmis S, Deniz M, Gamsizkan H, Guler AM, Ocalan K, Ozpineci A, Serin M, Sever R, Surat UE, Zeyrek M, Deliomeroglu M, Demir D, Gülmez E, Halu A, Isildak B, Kaya M, Kaya O, Ozbek M, Ozkorucuklu S, Sonmez N, Levchuk L, Bell P, Bostock F, Brooke JJ, Cheng TL, Cussans D, Frazier R, Goldstein J, Hansen M, Heath GP, Heath HF, Hill C, Huckvale B, Jackson J, Kreczko L, Mackay CK, Metson S, Newbold DM, Nirunpong K, Smith VJ, Ward S, Basso L, Bell KW, Belyaev A, Brew C, Brown RM, Camanzi B, Cockerill DJA, Coughlan JA, Harder K, Harper S, Kennedy BW, Olaiya E, Radburn-Smith BC, Shepherd-Themistocleous CH, Tomalin IR, Womersley WJ, Worm SD, Bainbridge R, Ball G, Ballin J, Beuselinck R, Buchmuller O, Colling D, Cripps N, Cutajar M, Davies G, Della Negra M, Foudas C, Fulcher J, Futyan D, Guneratne Bryer A, Hall G, Hatherell Z, Hays J, Iles G, Karapostoli G, Lyons L, Magnan AM, Marrouche J, Nandi R, Nash J, Nikitenko A, Papageorgiou A, Pesaresi M, Petridis K, Pioppi M, Raymond DM, Rompotis N, Rose A, Ryan MJ, Seez C, Sharp P, Sparrow A, Stoye M, Tapper A, Tourneur S, Vazquez Acosta M, Virdee T, Wakefield S, Wardrope D, Whyntie T, Barrett M, Chadwick M, Cole JE, Hobson PR, Khan A, Kyberd P, Leslie D, Reid ID, Teodorescu L, Bose T, Clough A, Heister A, St John J, Lawson P, Lazic D, Rohlf J, Sulak L, Andrea J, Avetisyan A, Bhattacharya S, Chou JP, Cutts D, Esen S, Heintz U, Jabeen S, Kukartsev G, Landsberg G, Narain M, Nguyen D, Speer T, Tsang KV, Borgia MA, Breedon R, Calderon De La Barca Sanchez M, Cebra D, Chertok M, Conway J, Cox PT, Dolen J, Erbacher R, Friis E, Ko W, Kopecky A, Lander R, Liu H, Maruyama S, Miceli T, Nikolic M, Pellett D, Robles J, Schwarz T, Searle M, Smith J, Squires M, Tripathi M, Vasquez Sierra R, Veelken C, Andreev V, Arisaka K, Cline D, Cousins R, Deisher A, Erhan S, Farrell C, Felcini M, Hauser J, Ignatenko M, Jarvis C, Plager C, Rakness G, Schlein P, Tucker J, Valuev V, Wallny R, Babb J, Clare R, Ellison J, Gary JW, Hanson G, Jeng GY, Kao SC, Liu F, Liu H, Luthra A, Nguyen H, Pasztor G, Satpathy A, Shen BC, Stringer R, Sturdy J, Sumowidagdo S, Wilken R, Wimpenny S, Andrews W, Branson JG, Dusinberre E, Evans D, Golf F, Holzner A, Kelley R, Lebourgeois M, Letts J, Mangano B, Muelmenstaedt J, Padhi S, Palmer C, Petrucciani G, Pi H, Pieri M, Ranieri R, Sani M, Sharma V, Simon S, Tu Y, Vartak A, Würthwein F, Yagil A, Barge D, Blume M, Campagnari C, D'Alfonso M, Danielson T, Garberson J, Incandela J, Justus C, Kalavase P, Koay SA, Kovalskyi D, Krutelyov V, Lamb J, Lowette S, Pavlunin V, Rebassoo F, Ribnik J, Richman J, Rossin R, Stuart D, To W, Vlimant JR, Witherell M, Bornheim A, Bunn J, Gataullin M, Kcira D, Litvine V, Ma Y, Newman HB, Rogan C, Shin K, Timciuc V, Veverka J, Wilkinson R, Yang Y, Zhu RY, Akgun B, Carroll R, Ferguson T, Jang DW, Jun SY, Paulini M, Russ J, Terentyev N, Vogel H, Vorobiev I, Cumalat JP, Dinardo ME, Drell BR, Ford WT, Heyburn B, Luiggi Lopez E, Nauenberg U, Smith JG, Stenson K, Ulmer KA, Wagner SR, Zang SL, Agostino L, Alexander J, Blekman F, Chatterjee A, Das S, Eggert N, Fields LJ, Gibbons LK, Heltsley B, Hopkins W, Khukhunaishvili A, Kreis B, Kuznetsov V, Kaufman GN, Patterson JR, Puigh D, Riley D, Ryd A, Shi X, Sun W, Teo WD, Thom J, Thompson J, Vaughan J, Weng Y, Wittich P, Biselli A, Cirino G, Winn D, Abdullin S, Albrow M, Anderson J, Apollinari G, Atac M, Bakken JA, Banerjee S, Bauerdick LAT, Beretvas A, Berryhill J, Bhat PC, Bloch I, Borcherding F, Burkett K, Butler JN, Chetluru V, Cheung HWK, Chlebana F, Cihangir S, Demarteau M, Eartly DP, Elvira VD, Fisk I, Freeman J, Gao Y, Gottschalk E, Green D, Gutsche O, Hahn A, Hanlon J, Harris RM, James E, Jensen H, Johnson M, Joshi U, Khatiwada R, Kilminster B, Klima B, Kousouris K, Kunori S, Kwan S, Limon P, Lipton R, Lykken J, Maeshima K, Marraffino JM, Mason D, McBride P, McCauley T, Miao T, Mishra K, Mrenna S, Musienko Y, Newman-Holmes C, O'Dell V, Popescu S, Pordes R, Prokofyev O, Saoulidou N, Sexton-Kennedy E, Sharma S, Smith RP, Soha A, Spalding WJ, Spiegel L, Tan P, Taylor L, Tkaczyk S, Uplegger L, Vaandering EW, Vidal R, Whitmore J, Wu W, Yumiceva F, Yun JC, Acosta D, Avery P, Bourilkov D, Chen M, Di Giovanni GP, Dobur D, Drozdetskiy A, Field RD, Fu Y, Furic IK, Gartner J, Kim B, Klimenko S, Konigsberg J, Korytov A, Kotov K, Kropivnitskaya A, Kypreos T, Matchev K, Mitselmakher G, Pakhotin Y, Piedra Gomez J, Prescott C, Remington R, Schmitt M, Scurlock B, Sellers P, Wang D, Yelton J, Zakaria M, Ceron C, Gaultney V, Kramer L, Lebolo LM, Linn S, Markowitz P, Martinez G, Mesa D, Rodriguez JL, Adams T, Askew A, Chen J, Diamond B, Gleyzer SV, Haas J, Hagopian S, Hagopian V, Jenkins M, Johnson KF, Prosper H, Sekmen S, Veeraraghavan V, Baarmand MM, Guragain S, Hohlmann M, Kalakhety H, Mermerkaya H, Ralich R, Vodopiyanov I, Adams MR, Anghel IM, Apanasevich L, Bazterra VE, Betts RR, Callner J, Cavanaugh R, Dragoiu C, Garcia-Solis EJ, Gerber CE, Hofman DJ, Khalatian S, Lacroix F, Shabalina E, Smoron A, Strom D, Varelas N, Akgun U, Albayrak EA, Bilki B, Cankocak K, Clarida W, Duru F, Lae CK, McCliment E, Merlo JP, Mestvirishvili A, Moeller A, Nachtman J, Newsom CR, Norbeck E, Olson J, Onel Y, Ozok F, Sen S, Wetzel J, Yetkin T, Yi K, Barnett BA, Blumenfeld B, Bonato A, Eskew C, Fehling D, Giurgiu G, Gritsan AV, Guo ZJ, Hu G, Maksimovic P, Rappoccio S, Swartz M, Tran NV, Whitbeck A, Baringer P, Bean A, Benelli G, Grachov O, Murray M, Radicci V, Sanders S, Wood JS, Zhukova V, Bandurin D, Bolton T, Chakaberia I, Ivanov A, Kaadze K, Maravin Y, Shrestha S, Svintradze I, Wan Z, Gronberg J, Lange D, Wright D, Baden D, Boutemeur M, Eno SC, Ferencek D, Hadley NJ, Kellogg RG, Kirn M, Mignerey A, Rossato K, Rumerio P, Santanastasio F, Skuja A, Temple J, Tonjes MB, Tonwar SC, Twedt E, Alver B, Bauer G, Bendavid J, Busza W, Butz E, Cali IA, Chan M, D'Enterria D, Everaerts P, Gomez Ceballos G, Goncharov M, Hahn KA, Harris P, Kim Y, Klute M, Lee YJ, Li W, Loizides C, Luckey PD, Ma T, Nahn S, Paus C, Roland C, Roland G, Rudolph M, Stephans GSF, Sumorok K, Sung K, Wenger EA, Wyslouch B, Xie S, Yilmaz Y, Yoon AS, Zanetti M, Cole P, Cooper SI, Cushman P, Dahmes B, De Benedetti A, Dudero PR, Franzoni G, Haupt J, Klapoetke K, Kubota Y, Mans J, Petyt D, Rekovic V, Rusack R, Sasseville M, Singovsky A, Cremaldi LM, Godang R, Kroeger R, Perera L, Rahmat R, Sanders DA, Sonnek P, Summers D, Bloom K, Bose S, Butt J, Claes DR, Dominguez A, Eads M, Keller J, Kelly T, Kravchenko I, Lazo-Flores J, Lundstedt C, Malbouisson H, Malik S, Snow GR, Baur U, Iashvili I, Kharchilava A, Kumar A, Smith K, Strang M, Zennamo J, Alverson G, Barberis E, Baumgartel D, Boeriu O, Reucroft S, Swain J, Wood D, Zhang J, Anastassov A, Kubik A, Ofierzynski RA, Pozdnyakov A, Schmitt M, Stoynev S, Velasco M, Won S, Antonelli L, Berry D, Hildreth M, Jessop C, Karmgard DJ, Kolb J, Kolberg T, Lannon K, Lynch S, Marinelli N, Morse DM, Ruchti R, Slaunwhite J, Valls N, Warchol J, Wayne M, Ziegler J, Bylsma B, Durkin LS, Gu J, Killewald P, Ling TY, Williams G, Adam N, Berry E, Elmer P, Gerbaudo D, Halyo V, Hunt A, Jones J, Laird E, Lopes Pegna D, Marlow D, Medvedeva T, Mooney M, Olsen J, Piroué P, Stickland D, Tully C, Werner JS, Zuranski A, Acosta JG, Huang XT, Lopez A, Mendez H, Oliveros S, Ramirez Vargas JE, Zatzerklyaniy A, Alagoz E, Barnes VE, Bolla G, Borrello L, Bortoletto D, Everett A, Garfinkel AF, Gecse Z, Gutay L, Jones M, Koybasi O, Laasanen AT, Leonardo N, Liu C, Maroussov V, Merkel P, Miller DH, Neumeister N, Potamianos K, Shipsey I, Silvers D, Yoo HD, Zablocki J, Zheng Y, Jindal P, Parashar N, Cuplov V, Ecklund KM, Geurts FJM, Liu JH, Morales J, Padley BP, Redjimi R, Roberts J, Betchart B, Bodek A, Chung YS, de Barbaro P, Demina R, Flacher H, Garcia-Bellido A, Gotra Y, Han J, Harel A, Miner DC, Orbaker D, Petrillo G, Vishnevskiy D, Zielinski M, Bhatti A, Demortier L, Goulianos K, Hatakeyama K, Lungu G, Mesropian C, Yan M, Atramentov O, Gershtein Y, Gray R, Halkiadakis E, Hidas D, Hits D, Lath A, Rose K, Schnetzer S, Somalwar S, Stone R, Thomas S, Cerizza G, Hollingsworth M, Spanier S, Yang ZC, York A, Asaadi J, Eusebi R, Gilmore J, Gurrola A, Kamon T, Khotilovich V, Montalvo R, Nguyen CN, Pivarski J, Safonov A, Sengupta S, Toback D, Weinberger M, Akchurin N, Bardak C, Damgov J, Jeong C, Kovitanggoon K, Lee SW, Mane P, Roh Y, Sill A, Volobouev I, Wigmans R, Yazgan E, Appelt E, Brownson E, Engh D, Florez C, Gabella W, Johns W, Kurt P, Maguire C, Melo A, Sheldon P, Velkovska J, Arenton MW, Balazs M, Buehler M, Conetti S, Cox B, Hirosky R, Ledovskoy A, Neu C, Yohay R, Gollapinni S, Gunthoti K, Harr R, Karchin PE, Mattson M, Milstène C, Sakharov A, Anderson M, Bachtis M, Bellinger JN, Carlsmith D, Dasu S, Dutta S, Efron J, Gray L, Grogg KS, Grothe M, Hall-Wilton R, Herndon M, Klabbers P, Klukas J, Lanaro A, Lazaridis C, Leonard J, Lomidze D, Loveless R, Mohapatra A, Polese G, Reeder D, Savin A, Smith WH, Swanson J, Weinberg M. Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at square root of s = 7 TeV. Phys Rev Lett 2010; 105:022002. [PMID: 20867699 DOI: 10.1103/physrevlett.105.022002] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2010] [Indexed: 05/29/2023]
Abstract
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at square root of s = 7 TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit pairs, and fully reconstructed charged-particle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity dN(ch)/dη|(|η|<0.5) = 5.78 ± 0.01(stat) ± 0.23(syst) for non-single-diffractive events, higher than predicted by commonly used models. The relative increase in charged-particle multiplicity from square root of s = 0.9 to 7 TeV is [66.1 ± 1.0(stat) ± 4.2(syst)]%. The mean transverse momentum is measured to be 0.545 ± 0.005(stat) ± 0.015(syst) GeV/c. The results are compared with similar measurements at lower energies.
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Williams JC, Steiner LA, Ogden RC, Simon MI, Feher G. Primary structure of the M subunit of the reaction center from Rhodopseudomonas sphaeroides. Proc Natl Acad Sci U S A 2010; 80:6505-9. [PMID: 16593385 PMCID: PMC390381 DOI: 10.1073/pnas.80.21.6505] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The reaction center is a membrane-bound bacteriochlorophyll-protein complex that mediates the primary photochemical events in the photosynthetic bacterium Rhodopseudomonas sphaeroides. The previously determined amino-terminal sequences of the three subunits of the reaction center protein were used to design synthetic mixed oligonucleotide probes for the structural genes encoding the subunits. One of these probes was used to isolate and clone a fragment of DNA from R. sphaeroides that contained the gene encoding the M subunit. The nucleotide sequence of this gene was determined by the dideoxy method. In addition, a number of tryptic and chymotryptic peptides from the M protein were isolated and subjected to sequence analysis, and the sequence of the carboxyl terminus was determined. Together with the amino-terminal sequence, the data establish the primary structure of the M protein. The distribution of hydrophobic residues in the amino acid sequence suggests the presence of five membrane-spanning segments. A significant homology was found between the amino acid sequence of the M subunit and a thylakoid membrane protein (M(r) 32,000) from spinach that has been implicated in herbicide and quinone binding.
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Affiliation(s)
- J C Williams
- Department of Biology, University of California, San Diego, La Jolla, CA 92093
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Vigler M, Lee SK, Palti R, Williams JC, Kaminsky AJ, Posner MA, Hausman MR. Biomechanical comparison of techniques to reduce the bulk of lacerated flexor tendon ends within digital sheaths of the porcine forelimb. J Hand Surg Am 2009; 34:1653-8. [PMID: 19762164 DOI: 10.1016/j.jhsa.2009.06.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2008] [Revised: 06/26/2009] [Accepted: 06/29/2009] [Indexed: 02/02/2023]
Abstract
PURPOSE Zone II flexor tendon repairs may create a bulging effect with increased bulk and resistance to tendon gliding. A biomechanical time 0 study was performed to assess 2 methods of tendon antibulking for work of flexion and strength characteristics. METHODS We placed 24 fresh-frozen porcine forelimb tendons in a custom jig. Deep flexor tendon was sectioned just distal to the intact A1 and A2 pulleys. Specimens were divided into 3 groups before repair: group 1, nonmodified tendon; group 2, 30 degrees bilateral notch excised from both tendon ends; and group 3, triangular longitudinal central wedge excised from both tendon ends. All repairs used a 4-strand modified Kessler core suture and running circumferential epitendinous suture. Work of flexion, 2-mm gap formation, and ultimate load to failure were tested. RESULTS Both antibulking techniques (groups 2 and 3) had significantly less work of flexion than group 1 (36.3 and 34.9 J vs 142.9 J, p < .001). There was no significant change in work of flexion between groups 2 and 3 (p > .05). There was no significant difference in terms of 2-mm gap formation among the 3 groups (p > .05). Groups 1 and 3 exhibited a significantly higher load to failure compared with group 2 (p < .05). CONCLUSIONS The antibulking repair techniques used in this study decrease the work of flexion with no significant change in force to 2-mm gap formation. Group 2, however, did have significantly lower load to failure. These techniques might be beneficial in zone II flexor tendon injury, in which the tight annular pulley system restricts tendon gliding. However, this is a time 0 study and the potential adverse effects of increase tendon manipulation and trauma were not analyzed, which might increase adhesions and scar during the healing phase of tendon repair.
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Affiliation(s)
- M Vigler
- Department of Orthopedic Surgery, Mount Sinai Medical Center, New York, NY 11210, USA.
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Felton EA, Radwin RG, Wilson JA, Williams JC. Evaluation of a modified Fitts law brain-computer interface target acquisition task in able and motor disabled individuals. J Neural Eng 2009; 6:056002. [PMID: 19700814 PMCID: PMC4075430 DOI: 10.1088/1741-2560/6/5/056002] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A brain-computer interface (BCI) is a communication system that takes recorded brain signals and translates them into real-time actions, in this case movement of a cursor on a computer screen. This work applied Fitts' law to the evaluation of performance on a target acquisition task during sensorimotor rhythm-based BCI training. Fitts' law, which has been used as a predictor of movement time in studies of human movement, was used here to determine the information transfer rate, which was based on target acquisition time and target difficulty. The information transfer rate was used to make comparisons between control modalities and subject groups on the same task. Data were analyzed from eight able-bodied and five motor disabled participants who wore an electrode cap that recorded and translated their electroencephalogram (EEG) signals into computer cursor movements. Direct comparisons were made between able-bodied and disabled subjects, and between EEG and joystick cursor control in able-bodied subjects. Fitts' law aptly described the relationship between movement time and index of difficulty for each task movement direction when evaluated separately and averaged together. This study showed that Fitts' law can be successfully applied to computer cursor movement controlled by neural signals.
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Affiliation(s)
- E A Felton
- Department of Biomedical Engineering, University of Wisconsin-Madison, WI 53706, USA
| | - R G Radwin
- Department of Biomedical Engineering, University of Wisconsin-Madison, WI 53706, USA
| | - J A Wilson
- Department of Biomedical Engineering, University of Wisconsin-Madison, WI 53706, USA
| | - J C Williams
- Department of Biomedical Engineering, University of Wisconsin-Madison, WI 53706, USA
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Gohlke PR, Williams JC, Vilen BJ, Dillon SR, Tisch R, Matsushima GK. The receptor tyrosine kinase MerTK regulates dendritic cell production of BAFF. Autoimmunity 2009; 42:183-97. [PMID: 19301199 DOI: 10.1080/08916930802668586] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The MerTK receptor tyrosine kinase is an important negative regulator of dendritic cell function and is required to prevent B cell autoimmunity in vivo. It is not currently known however, if any causal relationship exists between these two aspects of MerTK function. We sought to determine if dendritic cells (DC) from mice lacking MerTK (mertk(- / - ) mice) have characteristics that may aid in the development of B cell autoimmunity. Specifically, we found that mertk(- / - ) mice contain an elevated number of splenic DC, and this population contains an elevated proportion of cells secreting the critical B cell pro-survival factor, B cell activating factor (BAFF). Elevated numbers of BAFF-secreting cells were also detected among mertk(- / - ) bone marrow-derived dendritic cell (BMDC) populations. This was observed in both resting BMDC, and BMDC stimulated with lipopolysaccharide (LPS) or treated with exogenous apoptotic cells. We also found that DC in general have a pro-survival effect on resting B cells in co-culture. However, despite containing more BAFF-secreting cells, mertk(- / - ) BMDC were not superior to C57BL/6 or baff-deficient BMDC at promoting B cell survival. Furthermore, using decoy receptors, we show that DC may promote B cell survival and autoimmunity through a BAFF-and a proliferation-inducing ligand-independent mechanism.
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Affiliation(s)
- P R Gohlke
- Department of Microbiology and Immunology, University of North Carolina-CH, Chapel Hill, 27599, USA
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Abstract
In Noh, a traditional performing art of Japan, extremely expressive voice quality is used to convey an emotional message. A periodicity of voice appears responsible for these special effects. Acoustic signals were recorded for selected portions of dramatic singing in order to study the acoustic effects of delicate voice control by a master of the Konparu school. Using a signal analysis-synthesis algorithm, TANDEM-STRAIGHT, to represent multiple candidates for pitch perception, signals deviating from the harmonic structure have been successfully displayed, corresponding to auditory impressions of pitch movements, even when narrow-band spectrograms failed to show the perceived events. Strong interaction between vocal tract resonance and vocal fold vibration seems to play a major role in producing these expressive voice qualities.
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Affiliation(s)
- Osamu Fujimura
- The Ohio State University, Department of Speech and Hearing Science, Columbus, OH 43210-1002, USA.
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Allen JP, Cordova JM, Jolley CC, Murray TA, Schneider JW, Woodbury NW, Williams JC, Niklas J, Klihm G, Reus M, Lubitz W. EPR, ENDOR, and special TRIPLE measurements of P(*+) in wild type and modified reaction centers from Rb. sphaeroides. Photosynth Res 2009; 99:1-10. [PMID: 18819016 DOI: 10.1007/s11120-008-9346-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2008] [Accepted: 07/22/2008] [Indexed: 05/26/2023]
Abstract
The influence of the protein environment on the primary electron donor, P, a bacteriochlorophyll a dimer, of reaction centers from Rhodobacter sphaeroides, has been investigated using electron paramagnetic resonance and electron nuclear double resonance spectroscopy. These techniques were used to probe the effects on P that are due to alteration of three amino acid residues, His L168, Asn L170, and Asn M199. The introduction of Glu at L168, Asp at L170, or Asp at M199 changes the oxidation/reduction midpoint potential of P in a pH-dependent manner (Williams et al. (2001) Biochemistry 40, 15403-15407). For the double mutant His L168 to Glu and Asn at L170 to Asp, excitation results in electron transfer along the A-side branch of cofactors at pH 7.2, but at pH 9.5, a long-lived state involving B-side cofactors is produced (Haffa et al. (2004) J Phys Chem B 108, 4-7). Using electron paramagnetic resonance spectroscopy, the mutants with alterations of each of the three individual residues and a double mutant, with changes at L168 and L170, were found to have increased linewidths of 10.1-11.0 G compared to the linewidth of 9.6 G for wild type. The Special TRIPLE spectra were pH dependent, and at pH 8, the introduction of aspartate at L170 increased the spin density ratio, rho (L)/rho (M), to 6.1 while an aspartate at the symmetry related position, M199, decreased the ratio to 0.7 compared to the value of 2.1 for wild type. These results indicate that the energy of the two halves of P changes by about 100 meV due to the mutations and are consistent with the interpretation that electrostatic interactions involving these amino acid residues contribute to the switch in pathway of electron transfer.
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Affiliation(s)
- J P Allen
- Department of Chemistry and Biochemistry and Center for Bioenergy and Photosynthesis, Arizona State University, Tempe, AZ, 85287-1604, USA.
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Wang H, Lin S, Katilius E, Laser C, Allen JP, Williams JC, Woodbury NW. Unusual Temperature Dependence of Photosynthetic Electron Transfer due to Protein Dynamics. J Phys Chem B 2008; 113:818-24. [DOI: 10.1021/jp807468c] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Haiyu Wang
- The Biodesign Institute at Arizona State University, 1001 South McAllister Avenue, Tempe, Arizona 85287-5201, and The Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604
| | - Su Lin
- The Biodesign Institute at Arizona State University, 1001 South McAllister Avenue, Tempe, Arizona 85287-5201, and The Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604
| | - Evaldas Katilius
- The Biodesign Institute at Arizona State University, 1001 South McAllister Avenue, Tempe, Arizona 85287-5201, and The Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604
| | - Christa Laser
- The Biodesign Institute at Arizona State University, 1001 South McAllister Avenue, Tempe, Arizona 85287-5201, and The Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604
| | - James P. Allen
- The Biodesign Institute at Arizona State University, 1001 South McAllister Avenue, Tempe, Arizona 85287-5201, and The Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604
| | - JoAnn C. Williams
- The Biodesign Institute at Arizona State University, 1001 South McAllister Avenue, Tempe, Arizona 85287-5201, and The Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604
| | - Neal W. Woodbury
- The Biodesign Institute at Arizona State University, 1001 South McAllister Avenue, Tempe, Arizona 85287-5201, and The Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604
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Kálmán L, Williams JC, Allen JP. Comparison of bacterial reaction centers and photosystem II. Photosynth Res 2008; 98:643-655. [PMID: 18853275 DOI: 10.1007/s11120-008-9369-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2008] [Accepted: 09/11/2008] [Indexed: 05/26/2023]
Abstract
In photosynthetic organisms, the utilization of solar energy to drive electron and proton transfer reactions across membranes is performed by pigment-protein complexes including bacterial reaction centers (BRCs) and photosystem II. The well-characterized BRC has served as a structural and functional model for the evolutionarily-related photosystem II for many years. Even though these complexes transfer electrons and protons across cell membranes in analogous manners, they utilize different secondary electron donors. Photosystem II has the unique ability to abstract electrons from water, while BRCs use molecules with much lower potentials as electron donors. This article compares the two complexes and reviews the factors that give rise to the functional differences. Also discussed are the modifications that have been performed on BRCs so that they perform reactions, such as amino acid and metal oxidation, which occur in photosystem II.
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Affiliation(s)
- László Kálmán
- Department of Physics, Concordia University, Montreal, QC, Canada
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Aubert B, Bona M, Boutigny D, Couderc F, Karyotakis Y, Lees JP, Poireau V, Tisserand V, Zghiche A, Grauges E, Palano A, Chen JC, Qi ND, Rong G, Wang P, Zhu YS, Eigen G, Ofte I, Stugu B, Abrams GS, Battaglia M, Brown DN, Button-Shafer J, Cahn RN, Charles E, Gill MS, Groysman Y, Jacobsen RG, Kadyk JA, Kerth LT, Kolomensky YG, Kukartsev G, Pegna DL, Lynch G, Mir LM, Orimoto TJ, Pripstein M, Roe NA, Ronan MT, Wenzel WA, del Amo Sanchez P, Barrett M, Ford KE, Harrison TJ, Hart AJ, Hawkes CM, Watson AT, Held T, Koch H, Lewandowski B, Pelizaeus M, Peters K, Schroeder T, Steinke M, Boyd JT, Burke JP, Cottingham WN, Walker D, Asgeirsson DJ, Cuhadar-Donszelmann T, Fulsom BG, Hearty C, Knecht NS, Mattison TS, McKenna JA, Khan A, Kyberd P, Saleem M, Sherwood DJ, Teodorescu L, Blinov VE, Bukin AD, Druzhinin VP, Golubev VB, Onuchin AP, Serednyakov SI, Skovpen YI, Solodov EP, Todyshev KY, Best DS, Bondioli M, Bruinsma M, Chao M, Curry S, Eschrich I, Kirkby D, Lankford AJ, Lund P, Mandelkern M, Roethel W, Stoker DP, Abachi S, Buchanan C, Foulkes SD, Gary JW, Long O, Shen BC, Wang K, Zhang L, Hadavand HK, Hill EJ, Paar HP, Rahatlou S, Sharma V, Berryhill JW, Campagnari C, Cunha A, Dahmes B, Hong TM, Kovalskyi D, Richman JD, Beck TW, Eisner AM, Flacco CJ, Heusch CA, Kroseberg J, Lockman WS, Nesom G, Schalk T, Schumm BA, Seiden A, Spradlin P, Williams DC, Wilson MG, Albert J, Chen E, Cheng CH, Dvoretskii A, Fang F, Hitlin DG, Narsky I, Piatenko T, Porter FC, Mancinelli G, Meadows BT, Mishra K, Sokoloff MD, Blanc F, Bloom PC, Chen S, Ford WT, Hirschauer JF, Kreisel A, Nagel M, Nauenberg U, Olivas A, Ruddick WO, Smith JG, Ulmer KA, Wagner SR, Zhang J, Chen A, Eckhart EA, Soffer A, Toki WH, Wilson RJ, Winklmeier F, Zeng Q, Altenburg DD, Feltresi E, Hauke A, Jasper H, Merkel J, Petzold A, Spaan B, Brandt T, Klose V, Lacker HM, Mader WF, Nogowski R, Schubert J, Schubert KR, Schwierz R, Sundermann JE, Volk A, Bernard D, Bonneaud GR, Latour E, Thiebaux C, Verderi M, Clark PJ, Gradl W, Muheim F, Playfer S, Robertson AI, Xie Y, Andreotti M, Bettoni D, Bozzi C, Calabrese R, Cibinetto G, Luppi E, Negrini M, Petrella A, Piemontese L, Prencipe E, Anulli F, Baldini-Ferroli R, Calcaterra A, de Sangro R, Finocchiaro G, Pacetti S, Patteri P, Peruzzi IM, Piccolo M, Rama M, Zallo A, Buzzo A, Contri R, Lo Vetere M, Macri MM, Monge MR, Passaggio S, Patrignani C, Robutti E, Santroni A, Tosi S, Brandenburg G, Chaisanguanthum KS, Lee CL, Morii M, Wu J, Dubitzky RS, Marks J, Schenk S, Uwer U, Bard DJ, Bhimji W, Bowerman DA, Dauncey PD, Egede U, Flack RL, Nash JA, Nikolich MB, Vazquez WP, Behera PK, Chai X, Charles MJ, Mallik U, Meyer NT, Ziegler V, Cochran J, Crawley HB, Dong L, Eyges V, Meyer WT, Prell S, Rosenberg EI, Rubin AE, Gritsan AV, Denig AG, Fritsch M, Schott G, Arnaud N, Davier M, Grosdidier G, Höcker A, Lepeltier V, Le Diberder F, Lutz AM, Oyanguren A, Pruvot S, Rodier S, Roudeau P, Schune MH, Serrano J, Stocchi A, Wang WF, Wormser G, Lange DJ, Wright DM, Chavez CA, Forster IJ, Fry JR, Gabathuler E, Gamet R, George KA, Hutchcroft DE, Payne DJ, Schofield KC, Touramanis C, Bevan AJ, Clarke CK, Di Lodovico F, Menges W, Sacco R, Cowan G, Flaecher HU, Hopkins DA, Jackson PS, McMahon TR, Salvatore F, Wren AC, Brown DN, Davis CL, Allison J, Barlow NR, Barlow RJ, Chia YM, Edgar CL, Lafferty GD, Naisbit MT, Williams JC, Yi JI, Chen C, Hulsbergen WD, Jawahery A, Lae CK, Roberts DA, Simi G, Blaylock G, Dallapiccola C, Hertzbach SS, Li X, Moore TB, Saremi S, Staengle H, Cowan R, Sciolla G, Sekula SJ, Spitznagel M, Taylor F, Yamamoto RK, Kim H, McLachlin SE, Patel PM, Robertson SH, Lazzaro A, Lombardo V, Palombo F, Bauer JM, Cremaldi L, Eschenburg V, Godang R, Kroeger R, Sanders DA, Summers DJ, Zhao HW, Brunet S, Côté D, Simard M, Taras P, Viaud FB, Nicholson H, Cavallo N, De Nardo G, Fabozzi F, Gatto C, Lista L, Monorchio D, Paolucci P, Piccolo D, Sciacca C, Baak MA, Raven G, Snoek HL, Jessop CP, LoSecco JM, Benelli G, Corwin LA, Gan KK, Honscheid K, Hufnagel D, Jackson PD, Kagan H, Kass R, Rahimi AM, Regensburger JJ, Ter-Antonyan R, Wong QK, Blount NL, Brau J, Frey R, Igonkina O, Kolb JA, Lu M, Potter CT, Rahmat R, Sinev NB, Strom D, Strube J, Torrence E, Gaz A, Margoni M, Morandin M, Pompili A, Posocco M, Rotondo M, Simonetto F, Stroili R, Voci C, Benayoun M, Briand H, Chauveau J, David P, Del Buono L, de la Vaissière C, Hamon O, Hartfiel BL, Leruste P, Malclès J, Ocariz J, Roos L, Therin G, Gladney L, Biasini M, Covarelli R, Angelini C, Batignani G, Bettarini S, Bucci F, Calderini G, Carpinelli M, Cenci R, Forti F, Giorgi MA, Lusiani A, Marchiori G, Mazur MA, Morganti M, Neri N, Paoloni E, Rizzo G, Walsh JJ, Haire M, Judd D, Wagoner DE, Biesiada J, Danielson N, Elmer P, Lau YP, Lu C, Olsen J, Smith AJS, Telnov AV, Bellini F, Cavoto G, D'Orazio A, del Re D, Di Marco E, Faccini R, Ferrarotto F, Ferroni F, Gaspero M, Gioi LL, Mazzoni MA, Morganti S, Piredda G, Polci F, Tehrani FS, Voena C, Ebert M, Schröder H, Waldi R, Adye T, Franek B, Olaiya EO, Ricciardi S, Wilson FF, Aleksan R, Emery S, Gaidot A, Ganzhur SF, de Monchenault GH, Kozanecki W, Legendre M, Vasseur G, Yèche C, Zito M, Chen XR, Liu H, Park W, Purohit MV, Wilson JR, Allen MT, Aston D, Bartoldus R, Bechtle P, Berger N, Claus R, Coleman JP, Convery MR, Dingfelder JC, Dorfan J, Dubois-Felsmann GP, Dujmic D, Dunwoodie W, Field RC, Glanzman T, Gowdy SJ, Graham MT, Grenier P, Halyo V, Hast C, Hryn'ova T, Innes WR, Kelsey MH, Kim P, Leith DWGS, Li S, Luitz S, Luth V, Lynch HL, MacFarlane DB, Marsiske H, Messner R, Muller DR, O'Grady CP, Ozcan VE, Perazzo A, Perl M, Pulliam T, Ratcliff BN, Roodman A, Salnikov AA, Schindler RH, Schwiening J, Snyder A, Stelzer J, Su D, Sullivan MK, Suzuki K, Swain SK, Thompson JM, Va'vra J, van Bakel N, Wagner AP, Weaver M, Weinstein AJR, Wisniewski WJ, Wittgen M, Wright DH, Wulsin HW, Yarritu AK, Yi K, Young CC, Burchat PR, Edwards AJ, Majewski SA, Petersen BA, Wilden L, Ahmed S, Alam MS, Bula R, Ernst JA, Jain V, Pan B, Saeed MA, Wappler FR, Zain SB, Bugg W, Krishnamurthy M, Spanier SM, Eckmann R, Ritchie JL, Satpathy A, Schilling CJ, Schwitters RF, Izen JM, Lou XC, Ye S, Bianchi F, Gallo F, Gamba D, Bomben M, Bosisio L, Cartaro C, Cossutti F, Della Ricca G, Dittongo S, Lanceri L, Vitale L, Azzolini V, Lopez-March N, Martinez-Vidal F, Banerjee S, Bhuyan B, Brown CM, Fortin D, Hamano K, Kowalewski R, Nugent IM, Roney JM, Sobie RJ, Back JJ, Harrison PF, Latham TE, Mohanty GB, Pappagallo M, Band HR, Chen X, Cheng B, Dasu S, Datta M, Flood KT, Hollar JJ, Kutter PE, Mellado B, Mihalyi A, Pan Y, Pierini M, Prepost R, Wu SL, Yu Z, Neal H. Exclusive branching-fraction measurements of semileptonic tau decays into three charged hadrons, into phipi(-)nu tau, and into phi K(-)nu tau. Phys Rev Lett 2008; 100:011801. [PMID: 18232752 DOI: 10.1103/physrevlett.100.011801] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2007] [Indexed: 05/25/2023]
Abstract
Using a data sample corresponding to an integrated luminosity of 342 fb(-1) collected with the BABAR detector at the SLAC PEP-II electron-positron storage ring operating at a center-of-mass energy near 10.58 GeV, we measure B(tau(-)--> pi(-)pi(-)pi+nu(tau)(ex.K(S0))=(8.83+/-0.01+/-0.13)%, B(tau(-) -->K(-)pi(-)pi+nu tau(ex.K(S0))=(0.273+/-0.002+/-0.009)%, B(tau(-) -->K(-)pi(-)K+nu tau)=(0.1346+/-0.0010+/-0.0036)%, and B(tau(-) -->K(-)K(-)K+nu tau)=(1.58+/-0.13+/-0.12)x10;{-5}, where the uncertainties are statistical and systematic, respectively. These include significant improvements over previous measurements and a first measurement of B(tau(-) -->K(-)K(-)K+nu tau) in which no resonance structure is assumed. We also report a first measurement of B(tau(-) -->var phi(-)nu tau)=(3.42+/-0.55+/-0.25)x10(-5), a new measurement of B(tau(-) -->var phi K(-)nu tau)=(3.39+/-0.20+/-0.28)x10(-5) and a first upper limit on B(tau(-) -->K(-)K(-)K+nu tau(ex.var phi)).
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Affiliation(s)
- B Aubert
- Laboratoire de Physique des Particules, IN2P3/CNRS et Université de Savoie, F-74941 Annecy-Le-Vieux, France
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Frampton JP, Hynd MR, Williams JC, Shuler ML, Shain W. Three-dimensional hydrogel cultures for modeling changes in tissue impedance around microfabricated neural probes. J Neural Eng 2007; 4:399-409. [PMID: 18057507 DOI: 10.1088/1741-2560/4/4/006] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
One limitation to the use of neuroprosthestic devices for chronic application, in the treatment of disease, is the reactive cell responses that occur surrounding the device after insertion. These cell and tissue responses result in increases in device impedance and failure of the device to interact with target populations of neurons. However, few tools are available to assess which components of the reactive response contribute most to changes in tissue impedance. An in vitro culture system has been developed that is capable of assessing individual components of the reactive response. The system utilizes alginate cell encapsulation to construct three-dimensional architectures that approach the cell densities found in rat cortex. The system was constructed around neuroNexus acute probes with on-board circuitry capable of monitoring the electrical properties of the surrounding tissue. This study demonstrates the utility of the system by demonstrating that differences in cell density within the three-dimensional alginate constructs result in differences in resistance and capacitance as measured by electrochemical impedance spectroscopy. We propose that this system can be used to model components of the reactive responses in brain tissue, and that the measurements recorded in vitro are comparable to measurements recorded in vivo.
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Affiliation(s)
- J P Frampton
- Department of Biomedical Sciences, School of Public Health, University at Albany, Albany, NY, USA.
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Johnson MD, Otto KJ, Williams JC, Kipke DR. Bias voltages at microelectrodes change neural interface properties in vivo. Conf Proc IEEE Eng Med Biol Soc 2007; 2004:4103-6. [PMID: 17271203 DOI: 10.1109/iembs.2004.1404145] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Rejuvenation of iridium microelectrode sites, which involves applying a 1.5 V bias for 4 s, has been shown to reduce site impedances of chronically implanted microelectrode arrays. This study applied complex impedance spectroscopy measurements to an equivalent circuit model of the electrode-tissue interface. Rejuvenation was found to cause a transient increase in electrode conductivity through an IrO2 layer and a decrease in the surrounding extracellular resistance by 85 +/- 1% (n=73, t-test p < 0.001) and a decrease in the immediate site resistance by 44 +/- 7% (n=73, t-test p<0.001). These findings may be useful as an intervention strategy to prolong the lifetime of chronic microelectrode implants for neuroprostheses.
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Affiliation(s)
- M D Johnson
- Department of Biomedical Engineering, University of Michigan, MI, USA
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Blake AJ, Pearce TM, Rao NS, Johnson SM, Williams JC. Multilayer PDMS microfluidic chamber for controlling brain slice microenvironment. Lab Chip 2007; 7:842-9. [PMID: 17594002 PMCID: PMC2556125 DOI: 10.1039/b704754a] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A novel three-layer microfluidic polydimethylsiloxane (PDMS) device was constructed with two fluid chambers that holds a brain slice in place with microposts while maintaining laminar perfusate flow above and below the slice. Our fabrication technique permits rapid production of PDMS layers that can be applied to brain slices of different shapes and sizes. In this study, the device was designed to fit the shape and thickness (530-700 microm) of a medullary brain slice taken from P0-P4 neonatal rats. Medullary slices in this chamber spontaneously produced rhythmic, respiratory-related motor output for up to 3 h, thereby demonstrating that brain slice viability was maintained for prolonged periods. This design is unique in that it achieves independent control of fluids through multiple channels in two separate fluid chambers. The laminar flow exhibited by the microfluidic chamber allows controlled solutions to target specific areas of the brain slice based on the input flow rates. To demonstrate this capability, a stream of Na(+)-free solution was focused on one half of a medullary slice to abolish spontaneous neural activity in only that half of the brain slice, while the other half remained active. We also demonstrated that flow of different solutions can be focused over the midline of the brain slice. The multilayer brain slice chamber design can integrate several traditional types of electrophysiology tools that are commonly used to measure neurophysiological properties of brain slices. Thus, this new microfluidic chamber is advantageous for experiments that involve controlled drug or solution delivery at high spatiotemporal resolution.
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Affiliation(s)
- A J Blake
- University of Wisconsin-Madison, Department of Biomedical Engineering, 1550 Engineering Drive, Madison, WI 53706, USA
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48
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Aubert B, Barate R, Bona M, Boutigny D, Couderc F, Karyotakis Y, Lees JP, Poireau V, Tisserand V, Zghiche A, Grauges E, Palano A, Chen JC, Qi ND, Rong G, Wang P, Zhu YS, Eigen G, Ofte I, Stugu B, Abrams GS, Battaglia M, Brown DN, Button-Shafer J, Cahn RN, Charles E, Gill MS, Groysman Y, Jacobsen RG, Kadyk JA, Kerth LT, Kolomensky YG, Kukartsev G, Lynch G, Mir LM, Orimoto TJ, Pripstein M, Roe NA, Ronan MT, Wenzel WA, del Amo Sanchez P, Barrett M, Ford KE, Harrison TJ, Hart AJ, Hawkes CM, Morgan SE, Watson AT, Held T, Koch H, Lewandowski B, Pelizaeus M, Peters K, Schroeder T, Steinke M, Boyd JT, Burke JP, Cottingham WN, Walker D, Cuhadar-Donszelmann T, Fulsom BG, Hearty C, Knecht NS, Mattison TS, McKenna JA, Khan A, Kyberd P, Saleem M, Sherwood DJ, Teodorescu L, Blinov VE, Bukin AD, Druzhinin VP, Golubev VB, Onuchin AP, Serednyakov SI, Skovpen YI, Solodov EP, Todyshev KY, Best DS, Bondioli M, Bruinsma M, Chao M, Curry S, Eschrich I, Kirkby D, Lankford AJ, Lund P, Mandelkern M, Mommsen RK, Roethel W, Stoker DP, Abachi S, Buchanan C, Foulkes SD, Gary JW, Long O, Shen BC, Wang K, Zhang L, Hadavand HK, Hill EJ, Paar HP, Rahatlou S, Sharma V, Berryhill JW, Campagnari C, Cunha A, Dahmes B, Hong TM, Kovalskyi D, Richman JD, Beck TW, Eisner AM, Flacco CJ, Heusch CA, Kroseberg J, Lockman WS, Nesom G, Schalk T, Schumm BA, Seiden A, Spradlin P, Williams DC, Wilson MG, Albert J, Chen E, Dvoretskii A, Fang F, Hitlin DG, Narsky I, Piatenko T, Porter FC, Ryd A, Samuel A, Mancinelli G, Meadows BT, Mishra K, Sokoloff MD, Blanc F, Bloom PC, Chen S, Ford WT, Hirschauer JF, Kreisel A, Nagel M, Nauenberg U, Olivas A, Ruddick WO, Smith JG, Ulmer KA, Wagner SR, Zhang J, Chen A, Eckhart EA, Soffer A, Toki WH, Wilson RJ, Winklmeier F, Zeng Q, Altenburg DD, Feltresi E, Hauke A, Jasper H, Petzold A, Spaan B, Brandt T, Klose V, Lacker HM, Mader WF, Nogowski R, Schubert J, Schubert KR, Schwierz R, Sundermann JE, Volk A, Bernard D, Bonneaud GR, Grenier P, Latour E, Thiebaux C, Verderi M, Clark PJ, Gradl W, Muheim F, Playfer S, Robertson AI, Xie Y, Andreotti M, Bettoni D, Bozzi C, Calabrese R, Cibinetto G, Luppi E, Negrini M, Petrella A, Piemontese L, Prencipe E, Anulli F, Baldini-Ferroli R, Calcaterra A, de Sangro R, Finocchiaro G, Pacetti S, Patteri P, Peruzzi IM, Piccolo M, Rama M, Zallo A, Buzzo A, Capra R, Contri R, Lo Vetere M, Macri MM, Monge MR, Passaggio S, Patrignani C, Robutti E, Santroni A, Tosi S, Brandenburg G, Chaisanguanthum KS, Morii M, Wu J, Dubitzky RS, Marks J, Schenk S, Uwer U, Bard DJ, Bhimji W, Bowerman DA, Dauncey PD, Egede U, Flack RL, Nash JA, Nikolich MB, Panduro Vazquez W, Behera PK, Chai X, Charles MJ, Mallik U, Meyer NT, Ziegler V, Cochran J, Crawley HB, Dong L, Eyges V, Meyer WT, Prell S, Rosenberg EI, Rubin AE, Gritsan AV, Denig AG, Fritsch M, Schott G, Arnaud N, Davier M, Grosdidier G, Höcker A, Le Diberder F, Lepeltier V, Lutz AM, Oyanguren A, Pruvot S, Rodier S, Roudeau P, Schune MH, Stocchi A, Wang WF, Wormser G, Cheng CH, Lange DJ, Wright DM, Chavez CA, Forster IJ, Fry JR, Gabathuler E, Gamet R, George KA, Hutchcroft DE, Payne DJ, Schofield KC, Touramanis C, Bevan AJ, Di Lodovico F, Menges W, Sacco R, Cowan G, Flaecher HU, Hopkins DA, Jackson PS, McMahon TR, Ricciardi S, Salvatore F, Wren AC, Brown DN, Davis CL, Allison J, Barlow NR, Barlow RJ, Chia YM, Edgar CL, Lafferty GD, Naisbit MT, Williams JC, Yi JI, Chen C, Hulsbergen WD, Jawahery A, Lae CK, Roberts DA, Simi G, Blaylock G, Dallapiccola C, Hertzbach SS, Li X, Moore TB, Saremi S, Staengle H, Cowan R, Sciolla G, Sekula SJ, Spitznagel M, Taylor F, Yamamoto RK, Kim H, McLachlin SE, Patel PM, Robertson SH, Lazzaro A, Lombardo V, Palombo F, Bauer JM, Cremaldi L, Eschenburg V, Godang R, Kroeger R, Sanders DA, Summers DJ, Zhao HW, Brunet S, Côté D, Simard M, Taras P, Viaud FB, Nicholson H, Cavallo N, De Nardo G, Fabozzi F, Gatto C, Lista L, Monorchio D, Paolucci P, Piccolo D, Sciacca C, Baak M, Raven G, Snoek HL, Jessop CP, LoSecco JM, Allmendinger T, Benelli G, Gan KK, Honscheid K, Hufnagel D, Jackson PD, Kagan H, Kass R, Rahimi AM, Ter-Antonyan R, Wong QK, Blount NL, Brau J, Frey R, Igonkina O, Lu M, Rahmat R, Sinev NB, Strom D, Strube J, Torrence E, Gaz A, Margoni M, Morandin M, Pompili A, Posocco M, Rotondo M, Simonetto F, Stroili R, Voci C, Benayoun M, Chauveau J, Briand H, David P, Del Buono L, de la Vaissière C, Hamon O, Hartfiel BL, John MJJ, Leruste P, Malclès J, Ocariz J, Roos L, Therin G, Gladney L, Panetta J, Biasini M, Covarelli R, Angelini C, Batignani G, Bettarini S, Bucci F, Calderini G, Carpinelli M, Cenci R, Forti F, Giorgi MA, Lusiani A, Marchiori G, Mazur MA, Morganti M, Neri N, Rizzo G, Walsh JJ, Haire M, Judd D, Wagoner DE, Biesiada J, Danielson N, Elmer P, Lau YP, Lu C, Olsen J, Smith AJS, Telnov AV, Bellini F, Cavoto G, D'Orazio A, del Re D, Di Marco E, Faccini R, Ferrarotto F, Ferroni F, Gaspero M, Li Gioi L, Mazzoni MA, Morganti S, Piredda G, Polci F, Safai Tehrani F, Voena C, Ebert M, Schröder H, Waldi R, Adye T, De Groot N, Franek B, Olaiya EO, Wilson FF, Aleksan R, Emery S, Gaidot A, Ganzhur SF, Hamel de Monchenault G, Kozanecki W, Legendre M, Vasseur G, Yèche C, Zito M, Chen XR, Liu H, Park W, Purohit MV, Wilson JR, Allen MT, Aston D, Bartoldus R, Bechtle P, Berger N, Claus R, Coleman JP, Convery MR, Cristinziani M, Dingfelder JC, Dorfan J, Dubois-Felsmann GP, Dujmic D, Dunwoodie W, Field RC, Glanzman T, Gowdy SJ, Graham MT, Halyo V, Hast C, Hryn'ova T, Innes WR, Kelsey MH, Kim P, Leith DWGS, Li S, Luitz S, Luth V, Lynch HL, MacFarlane DB, Marsiske H, Messner R, Muller DR, O'Grady CP, Ozcan VE, Perazzo A, Perl M, Pulliam T, Ratcliff BN, Roodman A, Salnikov AA, Schindler RH, Schwiening J, Snyder A, Stelzer J, Su D, Sullivan MK, Suzuki K, Swain SK, Thompson JM, Va'vra J, van Bakel N, Weaver M, Weinstein AJR, Wisniewski WJ, Wittgen M, Wright DH, Yarritu AK, Yi K, Young CC, Burchat PR, Edwards AJ, Majewski SA, Petersen BA, Roat C, Wilden L, Ahmed S, Alam MS, Bula R, Ernst JA, Jain V, Pan B, Saeed MA, Wappler FR, Zain SB, Bugg W, Krishnamurthy M, Spanier SM, Eckmann R, Ritchie JL, Satpathy A, Schilling CJ, Schwitters RF, Izen JM, Lou XC, Ye S, Bianchi F, Gallo F, Gamba D, Bomben M, Bosisio L, Cartaro C, Cossutti F, Della Ricca G, Dittongo S, Lanceri L, Vitale L, Azzolini V, Martinez-Vidal F, Banerjee S, Bhuyan B, Brown CM, Fortin D, Hamano K, Kowalewski R, Nugent IM, Roney JM, Sobie RJ, Back JJ, Harrison PF, Latham TE, Mohanty GB, Pappagallo M, Band HR, Chen X, Cheng B, Dasu S, Datta M, Flood KT, Hollar JJ, Kutter PE, Mellado B, Mihalyi A, Pan Y, Pierini M, Prepost R, Wu SL, Yu Z, Neal H. Evidence of a broad structure at an invariant mass of 4.32 GeV/c2 in the reaction e+e- --> pi+pi-psi(2S) measured at BABAR. Phys Rev Lett 2007; 98:212001. [PMID: 17677767 DOI: 10.1103/physrevlett.98.212001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2006] [Revised: 01/31/2007] [Indexed: 05/16/2023]
Abstract
We present a measurement of the cross section of the process e(+)e(-)-->pi(+)pi(-)psi(2S) from threshold up to 8 GeV center-of-mass energy using events containing initial-state radiation, produced at the SLAC PEP-II e(+)e(-) storage rings. The study is based on 298 fb(-1) of data recorded with the BABAR detector. A structure is observed in the cross section not far above threshold, near 4.32 GeV. We also investigate the compatibility of this structure with the Y(4260) previously reported by this experiment.
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Affiliation(s)
- B Aubert
- Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France
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Aubert B, Barate R, Boutigny D, Couderc F, Karyotakis Y, Lees JP, Poireau V, Tisserand V, Zghiche A, Grauges E, Palano A, Pappagallo M, Pompili A, Chen JC, Qi ND, Rong G, Wang P, Zhu YS, Eigen G, Ofte I, Stugu B, Abrams GS, Battaglia M, Breon AB, Brown DN, Button-Shafer J, Cahn RN, Charles E, Day CT, Gill MS, Gritsan AV, Groysman Y, Jacobsen RG, Kadel RW, Kadyk J, Kerth LT, Kolomensky YG, Kukartsev G, Lynch G, Mir LM, Oddone PJ, Orimoto TJ, Pripstein M, Roe NA, Ronan MT, Wenzel WA, Barrett M, Ford KE, Harrison TJ, Hart AJ, Hawkes CM, Morgan SE, Watson AT, Fritsch M, Goetzen K, Held T, Koch H, Lewandowski B, Pelizaeus M, Peters K, Schroeder T, Steinke M, Boyd JT, Burke JP, Chevalier N, Cottingham WN, Kelly MP, Cuhadar-Donszelmann T, Fulsom BG, Hearty C, Knecht NS, Mattison TS, McKenna JA, Khan A, Kyberd P, Saleem M, Teodorescu L, Blinov AE, Blinov VE, Bukin AD, Druzhinin VP, Golubev VB, Kravchenko EA, Onuchin AP, Serednyakov SI, Skovpen YI, Solodov EP, Yushkov AN, Best D, Bondioli M, Bruinsma M, Chao M, Eschrich I, Kirkby D, Lankford AJ, Mandelkern M, Mommsen RK, Roethel W, Stoker DP, Buchanan C, Hartfiel BL, Foulkes SD, Gary JW, Long O, Shen BC, Wang K, Zhang L, del Re D, Hadavand HK, Hill EJ, MacFarlane DB, Paar HP, Rahatlou S, Sharma V, Berryhill JW, Campagnari C, Cunha A, Dahmes B, Hong TM, Mazur MA, Richman JD, Verkerke W, Beck TW, Eisner AM, Flacco CJ, Heusch CA, Kroseberg J, Lockman WS, Nesom G, Schalk T, Schumm BA, Seiden A, Spradlin P, Williams DC, Wilson MG, Albert J, Chen E, Dubois-Felsmann GP, Dvoretskii A, Hitlin DG, Narsky I, Piatenko T, Porter FC, Ryd A, Samuel A, Andreassen R, Jayatilleke S, Mancinelli G, Meadows BT, Sokoloff MD, Blanc F, Bloom P, Chen S, Ford WT, Nauenberg U, Olivas A, Rankin P, Ruddick WO, Smith JG, Ulmer KA, Wagner SR, Zhang J, Chen A, Eckhart EA, Soffer A, Toki WH, Wilson RJ, Zeng Q, Altenburg D, Feltresi E, Hauke A, Spaan B, Brandt T, Brose J, Dickopp M, Klose V, Lacker HM, Nogowski R, Otto S, Petzold A, Schott G, Schubert J, Schubert KR, Schwierz R, Sundermann JE, Bernard D, Bonneaud GR, Grenier P, Schrenk S, Thiebaux C, Vasileiadis G, Verderi M, Bard DJ, Clark PJ, Gradl W, Muheim F, Playfer S, Xie Y, Andreotti M, Azzolini V, Bettoni D, Bozzi C, Calabrese R, Cibinetto G, Luppi E, Negrini M, Piemontese L, Anulli F, Baldini-Ferroli R, Calcaterra A, de Sangro R, Finocchiaro G, Patteri P, Peruzzi IM, Piccolo M, Zallo A, Buzzo A, Capra R, Contri R, Lo Vetere M, Macri M, Monge MR, Passaggio S, Patrignani C, Robutti E, Santroni A, Tosi S, Bailey S, Brandenburg G, Chaisanguanthum KS, Morii M, Won E, Wu J, Dubitzky RS, Langenegger U, Marks J, Schenk S, Uwer U, Bhimji W, Bowerman DA, Dauncey PD, Egede U, Flack RL, Gaillard JR, Morton GW, Nash JA, Nikolich MB, Taylor GP, Vazquez WP, Charles MJ, Mader WF, Mallik U, Mohapatra AK, Cochran J, Crawley HB, Eyges V, Meyer WT, Prell S, Rosenberg EI, Rubin AE, Yi J, Arnaud N, Davier M, Giroux X, Grosdidier G, Höcker A, Le Diberder F, Lepeltier V, Lutz AM, Oyanguren A, Petersen TC, Pierini M, Plaszczynski S, Rodier S, Roudeau P, Schune MH, Stocchi A, Wormser G, Cheng CH, Lange DJ, Simani MC, Wright DM, Bevan AJ, Chavez CA, Coleman JP, Forster IJ, Fry JR, Gabathuler E, Gamet R, George KA, Hutchcroft DE, Parry RJ, Payne DJ, Schofield KC, Touramanis C, Cormack CM, Di Lodovico F, Sacco R, Brown CL, Cowan G, Flaecher HU, Green MG, Hopkins DA, Jackson PS, McMahon TR, Ricciardi S, Salvatore F, Brown D, Davis CL, Allison J, Barlow NR, Barlow RJ, Hodgkinson MC, Lafferty GD, Naisbit MT, Williams JC, Chen C, Farbin A, Hulsbergen WD, Jawahery A, Kovalskyi D, Lae CK, Lillard V, Roberts DA, Simi G, Blaylock G, Dallapiccola C, Hertzbach SS, Kofler R, Koptchev VB, Li X, Moore TB, Saremi S, Staengle H, Willocq S, Cowan R, Koeneke K, Sciolla G, Sekula SJ, Spitznagel M, Taylor F, Yamamoto RK, Kim H, Patel PM, Robertson SH, Lazzaro A, Lombardo V, Palombo F, Bauer JM, Cremaldi L, Eschenburg V, Godang R, Kroeger R, Reidy J, Sanders DA, Summers DJ, Zhao HW, Brunet S, Côté D, Taras P, Viaud B, Nicholson H, Cavallo N, De Nardo G, Fabozzi F, Gatto C, Lista L, Monorchio D, Paolucci P, Piccolo D, Sciacca C, Baak M, Bulten H, Raven G, Snoek HL, Wilden L, Jessop CP, LoSecco JM, Allmendinger T, Benelli G, Gan KK, Honscheid K, Hufnagel D, Jackson PD, Kagan H, Kass R, Pulliam T, Rahimi AM, Ter-Antonyan R, Wong QK, Brau J, Frey R, Igonkina O, Lu M, Potter CT, Sinev NB, Strom D, Strube J, Torrence E, Dorigo A, Galeazzi F, Margoni M, Morandin M, Posocco M, Rotondo M, Simonetto F, Stroili R, Voci C, Benayoun M, Briand H, Chauveau J, David P, Del Buono L, de la Vaissière C, Hamon O, John MJJ, Leruste P, Malclès J, Ocariz J, Roos L, Therin G, Behera PK, Gladney L, Guo QH, Panetta J, Biasini M, Covarelli R, Pacetti S, Pioppi M, Angelini C, Batignani G, Bettarini S, Bucci F, Calderini G, Carpinelli M, Cenci R, Forti F, Giorgi MA, Lusiani A, Marchiori G, Morganti M, Neri N, Paoloni E, Rama M, Rizzo G, Walsh J, Haire M, Judd D, Wagoner DE, Biesiada J, Danielson N, Elmer P, Lau YP, Lu C, Olsen J, Smith AJS, Telnov AV, Bellini F, Cavoto G, D'Orazio A, Di Marco E, Faccini R, Ferrarotto F, Ferroni F, Gaspero M, Li Gioi L, Mazzoni MA, Morganti S, Piredda G, Polci F, Safai Tehrani F, Voena C, Schröder H, Wagner G, Waldi R, Adye T, De Groot N, Franek B, Gopal GP, Olaiya EO, Wilson FF, Aleksan R, Emery S, Gaidot A, Ganzhur SF, Giraud PF, Graziani G, Hamel de Monchenault G, Kozanecki W, Legendre M, London GW, Mayer B, Vasseur G, Yèche C, Zito M, Purohit MV, Weidemann AW, Wilson JR, Yumiceva FX, Abe T, Allen MT, Aston D, Bartoldus R, Berger N, Boyarski AM, Buchmueller OL, Claus R, Convery MR, Cristinziani M, Dingfelder JC, Dong D, Dorfan J, Dujmic D, Dunwoodie W, Fan S, Field RC, Glanzman T, Gowdy SJ, Hadig T, Halyo V, Hast C, Hryn'ova T, Innes WR, Kelsey MH, Kim P, Kocian ML, Leith DWGS, Libby J, Luitz S, Luth V, Lynch HL, Marsiske H, Messner R, Muller DR, O'Grady CP, Ozcan VE, Perazzo A, Perl M, Ratcliff BN, Roodman A, Salnikov AA, Schindler RH, Schwiening J, Snyder A, Stelzer J, Su D, Sullivan MK, Suzuki K, Swain S, Thompson JM, Va'vra J, Weaver M, Weinstein AJR, Wisniewski WJ, Wittgen M, Wright DH, Yarritu AK, Yi K, Young CC, Burchat PR, Edwards AJ, Majewski SA, Petersen BA, Roat C, Ahmed M, Ahmed S, Alam MS, Ernst JA, Saeed MA, Wappler FR, Zain SB, Bugg W, Krishnamurthy M, Spanier SM, Eckmann R, Ritchie JL, Satpathy A, Schwitters RF, Izen JM, Kitayama I, Lou XC, Ye S, Bianchi F, Bona M, Gallo F, Gamba D, Bomben M, Bosisio L, Cartaro C, Cossutti F, Della Ricca G, Dittongo S, Grancagnolo S, Lanceri L, Vitale L, Martinez-Vidal F, Panvini RS, Banerjee S, Bhuyan B, Brown CM, Fortin D, Hamano K, Kowalewski R, Roney JM, Sobie RJ, Back JJ, Harrison PF, Latham TE, Mohanty GB, Band HR, Chen X, Cheng B, Dasu S, Datta M, Eichenbaum AM, Flood KT, Graham M, Hollar JJ, Johnson JR, Kutter PE, Li H, Liu R, Mellado B, Mihalyi A, Pan Y, Prepost R, Tan P, von Wimmersperg-Toeller JH, Wu SL, Yu Z, Neal H. Measurement of branching fractions and mass spectra of B-->Kpipigamma. Phys Rev Lett 2007; 98:211804. [PMID: 17677766 DOI: 10.1103/physrevlett.98.211804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2006] [Indexed: 05/16/2023]
Abstract
We present a measurement of the partial branching fractions and mass spectra of the exclusive radiative penguin processes B-->Kpipigamma in the range m(Kpipi)<1.8 GeV/c(2). We reconstruct four final states: K(+)pi(-)pi(+)gamma, K(+)pi(-)pi(0)gamma, K(S)(0)pi(-)pi(+)gamma, and K(S)(0)pi(+)pi(0)gamma, where K(S)(0)-->pi(+)pi(-). Using 232 x 10(6) e(+)e(-)-->BB events recorded by the BABAR experiment at the SLAC PEP-II asymmetric-energy storage ring, we measure the branching fractions B(B(+)-->K(+)pi(-)pi(+)gamma)=[2.95+/-0.13(stat)+/-0.20(syst)] x 10(-5), B(B(0)-->K(+)pi(-)pi(0)gamma)=[4.07+/-0.22(stat)+/-0.31(syst)] x 10(-5), B(B(0)-->K(0)pi(+)pi(-)gamma)=[1.85+/-0.21(stat)+/-0.12(syst)] x 10(-5), and B(B(+)-->K(0)pi(+)pi(0)gamma)=[4.56+/-0.42(stat)+/-0.31(syst)] x 10(-5).
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Affiliation(s)
- B Aubert
- Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France
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Gharbia SE, Williams JC, Andrews DM, Shah HN. Genomic clusters and codon usage in relation to gene expression in oral Gram-negative anaerobes. Anaerobe 2007; 1:239-62. [PMID: 16887533 DOI: 10.1006/anae.1995.1024] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- S E Gharbia
- Department of Microbiology, Eastman Dental Institute, University of London, UK.
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