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Conti Nibali V, Pezzotti S, Sebastiani F, Galimberti DR, Schwaab G, Heyden M, Gaigeot MP, Havenith M. Wrapping Up Hydrophobic Hydration: Locality Matters. J Phys Chem Lett 2020; 11:4809-4816. [PMID: 32459100 PMCID: PMC8253475 DOI: 10.1021/acs.jpclett.0c00846] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 05/27/2020] [Indexed: 05/17/2023]
Abstract
Water, being the universal solvent, acts as a competing agent in fundamental processes, such as folding, aggregation or biomolecular recognition. A molecular understanding of hydrophobic hydration is of central importance to understanding the subtle free energy differences, which dictate function. Ab initio and classical molecular dynamics simulations yield two distinct hydration water populations in the hydration shell of solvated tert-butanol noted as "HB-wrap" and "HB-hydration2bulk". The experimentally observed hydration water spectrum can be dissected into two modes, centered at 164 and 195 cm-1. By comparison to the simulations, these two bands are attributed to the "HB-wrap" and "HB-hydration2bulk" populations, respectively. We derive a quantitative correlation between the population in each of these two local water coordination motifs and the temperature dependence of the solvation entropy. The crossover from entropy to enthalpy dominated solvation at elevated temperatures, as predicted by theory and observed experimentally, can be rationalized in terms of the distinct temperature stability and thermodynamic signatures of "HB-wrap" and "HB-hydration2bulk".
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Affiliation(s)
- V. Conti Nibali
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
| | - S. Pezzotti
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
- LAMBE
CNRS UMR8587, Université d’Evry
val d’Essonne & Université Paris-Saclay, 91000 Evry, France
| | - F. Sebastiani
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
| | - D. R. Galimberti
- LAMBE
CNRS UMR8587, Université d’Evry
val d’Essonne & Université Paris-Saclay, 91000 Evry, France
| | - G. Schwaab
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
| | - M. Heyden
- School
of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - M.-P. Gaigeot
- LAMBE
CNRS UMR8587, Université d’Evry
val d’Essonne & Université Paris-Saclay, 91000 Evry, France
| | - M. Havenith
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
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Hoberg C, Balzerowski P, Havenith M. Integration of a rapid scanning technique into THz time-domain spectrometers for nonlinear THz spectroscopy measurements. AIP Adv 2019; 9:035348. [PMID: 31249728 PMCID: PMC6594716 DOI: 10.1063/1.5080653] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Accepted: 03/15/2019] [Indexed: 06/09/2023]
Abstract
We have implemented a rapid scanning technique into THz time-domain spectrometers using an oscillating frictionless delay line, especially adapted for nonlinear THz experiments. Thereby we were able to increase the dynamic range of THz measurements in the frequency range from 40 to 200 cm-1 by up to 24 dB and reduce the scanning time by up to a factor of 200. We report here test measurements on TDS-setups at repetition rates of 80 MHz and 5 kHz. The dynamic range exceeds 64 dB, which allows to record even small changes in the THz absorption upon optical excitation by a THz probe, covering the frequency range of the intermolecular modes and the phonon bands. We demonstrate the potential of this technique for optical-pump THz-probe experiments using a 70 μm thick high-resistivity silicon, excited by 400 nm, ∼50 fs pulses as a sample.
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Affiliation(s)
- C. Hoberg
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - P. Balzerowski
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - M. Havenith
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum, Germany
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Ykema JMA, D'Haens EJ, Havenith M, van Eyck J, van Lingen RA, Hemels MAC. Pilot study demonstrates that placental histology can provide an additional tool for diagnosing early-onset neonatal sepsis. Acta Paediatr 2018; 107:2086-2091. [PMID: 29786145 DOI: 10.1111/apa.14410] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 04/20/2018] [Accepted: 05/16/2018] [Indexed: 12/29/2022]
Abstract
AIM We explored whether placental histology could help to diagnose early-onset neonatal sepsis (EONS), guide clinical decision-making 48 hours after birth and reduce antibiotic use. METHODS This study comprised 109 infants born at less than 32 weeks of gestation, who were admitted to the neonatal intensive care unit of Isala, Zwolle, The Netherlands, between January 2013 and December 2013. EONS was defined as clinical symptoms plus raised serial C-reactive protein (CRP) >10 mg/L and a positive (proven EONS) or a negative (suspected EONS) blood culture. Placentas were studied for a histological inflammatory response and scored according to Redline's criteria. RESULTS A histological inflammatory response was seen in 15/88 (17%) placentas and this occurred significantly more often in infants with a high suspicion of EONS (p < 0.05). No histological inflammatory response was seen if maternal risk factors for EONS were absent, despite a raised CRP level. Based on placental histology, the duration of antibiotic therapy was reduced from more than five days to 48 hours in 20/27 infants (74%). CONCLUSION Histological examination of the placenta helped to diagnose EONS and guide clinical decision-making 48 hours after birth and led to a clinically relevant reduction in antibiotic use.
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Affiliation(s)
- J M A Ykema
- Princess Amalia Children's Centre; Department of Neonatology; Isala Women and Children's Hospital Zwolle; AB Zwolle The Netherlands
| | - E J D'Haens
- Princess Amalia Children's Centre; Department of Neonatology; Isala Women and Children's Hospital Zwolle; AB Zwolle The Netherlands
| | - M Havenith
- Department of Pathology; Isala Women and Children's Hospital Zwolle; AB Zwolle The Netherlands
| | - J van Eyck
- Department of Obstetrics and Gynaecology; Isala Woman and Children's Hospital Zwolle; AB Zwolle The Netherlands
| | - R A van Lingen
- Princess Amalia Children's Centre; Department of Neonatology; Isala Women and Children's Hospital Zwolle; AB Zwolle The Netherlands
| | - M A C Hemels
- Princess Amalia Children's Centre; Department of Neonatology; Isala Women and Children's Hospital Zwolle; AB Zwolle The Netherlands
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Mukherjee K, Schwaab G, Havenith M. Cation-specific interactions of protein surface charges in dilute aqueous salt solutions: a combined study using dielectric relaxation spectroscopy and Raman spectroscopy. Phys Chem Chem Phys 2018; 20:29306-29313. [PMID: 30444249 DOI: 10.1039/c8cp05011b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
We exploited glycine as a zwitterionic model system to experimentally probe the cation specific interaction of protein surface charges in dilute (≤0.25 mol L-1) aqueous solutions of four biologically relevant inorganic salts, NaCl, KCl, MgCl2 and CaCl2, via dielectric relaxation spectroscopy (DRS) and Raman spectroscopy. Glycine is the simplest building block of proteins and it exposes the same charged groups (carboxylate and ammonium) to the solvent that dominate the protein-water interface. As a counter ion, we selected Cl- due to its biological importance. For all systems, we performed simultaneous fitting of the real (ε') and imaginary (ε″) parts of the dielectric functions, assuming a multimodal relaxation model, obtained from concentration dependent dielectric measurements at ∼293 K. We observe a reduction of the dielectric amplitude for the glycine relaxation while the corresponding time constant shows only small (<7%) deviations compared to aqueous glycine solutions. We propose that the observed reduction in dielectric amplitude is due to a reduction of the effective dipole moment (µeff) of zwitterionic glycine caused by the interaction of glycine with the ion even at very low (0.05 M) salt concentrations. The interaction between divalent metal ions and zwitterionic glycine is increased compared to the monovalent cation-zwitterion interaction; a finding that is also supported by Raman spectroscopy. Our combined dielectric relaxation and Raman spectroscopic study indicates that ion-glycine interactions are weak and mediated by the solvent. Cation-specificity of protein surface charges is also observed in dilute salt solutions (≤0.25 mol L-1), where electrostatic interactions dominate.
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Affiliation(s)
- K Mukherjee
- Ruhr University Bochum, Faculty of Chemistry and Biochemistry, Physical Chemistry 2, Germany.
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Knake L, Vondracek H, Havenith M. A novel set-up to investigate the low-frequency spectra of aqueous solutions at high hydrostatic pressure. Rev Sci Instrum 2016; 87:104101. [PMID: 27802710 DOI: 10.1063/1.4964099] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present a novel setup to investigate the low frequency (THz/FIR) spectra of an aqueous solution under high hydrostatic pressure (HHP). By integration of a diamond anvil cell into a THz Fourier transform spectrometer, we are able to record the absorption of bulk water in the pressure range from 1 bar to 10 kbar. The difference in intensity can directly be compared to the difference in extinction coefficients. The spectroscopic data reveal a blue shift of the H-bond stretch vibration at 180 cm-1, which is evidence of changes in the H-bond network dynamics.
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Affiliation(s)
- L Knake
- Department of Physical Chemistry II, Ruhr-University Bochum, 44780 Bochum, Germany
| | - H Vondracek
- Department of Physical Chemistry II, Ruhr-University Bochum, 44780 Bochum, Germany
| | - M Havenith
- Department of Physical Chemistry II, Ruhr-University Bochum, 44780 Bochum, Germany
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Di Florio G, Bründermann E, Yadavalli NS, Santer S, Havenith M. Graphene multilayer as nanosized optical strain gauge for polymer surface relief gratings. Nano Lett 2014; 14:5754-5760. [PMID: 25244634 DOI: 10.1021/nl502631s] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this paper, we show how graphene can be utilized as a nanoscopic probe in order to characterize local opto-mechanical forces generated within photosensitive azobenzene containing polymer films. Upon irradiation with light interference patterns, photosensitive films deform according to the spatial intensity variation, leading to the formation of periodic topographies such as surface relief gratings (SRG). The mechanical driving forces inscribing a pattern into the films are supposedly fairly large, because the deformation takes place without photofluidization; the polymer is in a glassy state throughout. However, until now there has been no attempt to characterize these forces by any means. The challenge here is that the forces vary locally on a nanometer scale. Here, we propose to use Raman analysis of the stretching of the graphene layer adsorbed on top of polymer film under deformation in order to probe the strength of the material transport spatially resolved. With the well-known mechanical properties of graphene, we can obtain lower bounds on the forces acting within the film. Upon the basis of our experimental results, we can deduce that the internal pressure in the film due to grating formation can exceed 1 GPa. The graphene-based nanoscopic gauge opens new possibilities to characterize opto-mechanical forces generated within photosensitive polymer films.
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Affiliation(s)
- G Di Florio
- Physical Chemistry II, Ruhr-Universität Bochum , Universitätsstrasse 150, 44780 Bochum, Germany
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7
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Affiliation(s)
- M. Heyden
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - G. Schwaab
- Lehrstuhl
für Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - M. Havenith
- Lehrstuhl
für Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum, Germany
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Filimon M, Kopf I, Schmidt DA, Bründermann E, Rühe J, Santer S, Havenith M. Local chemical composition of nanophase-separated polymer brushes. Phys Chem Chem Phys 2011; 13:11620-6. [DOI: 10.1039/c0cp02756a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gutberlet A, Schwaab G, Birer O, Masia M, Kaczmarek A, Forbert H, Havenith M, Marx D. Aggregation-Induced Dissociation of HCl(H2O)4 Below 1 K: The Smallest Droplet of Acid. Science 2009; 324:1545-8. [DOI: 10.1126/science.1171753] [Citation(s) in RCA: 176] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Heyden M, Bründermann E, Heugen U, Niehues G, Leitner DM, Havenith M. Long-range influence of carbohydrates on the solvation dynamics of water--answers from terahertz absorption measurements and molecular modeling simulations. J Am Chem Soc 2008; 130:5773-9. [PMID: 18393415 DOI: 10.1021/ja0781083] [Citation(s) in RCA: 218] [Impact Index Per Article: 13.6] [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
We present new terahertz (THz) spectroscopic measurements of solvated sugars and compare the effect of two disaccharides (trehalose and lactose) and one monosaccharide (glucose) with respect to the solute-induced changes in the sub-picosecond network dynamics of the hydration water. We found that the solute affects the fast collective network motions of the solvent, even beyond the first solvation layer. For all three carbohydrates, we find an increase of 2-4% in the THz absorption coefficient of the hydration water in comparison to bulk water. Concentration-dependent changes in the THz absorption between 2.1 and 2.8 THz of the solute-water mixture were measured with a precision better than 1% and were used to deduce a dynamical hydration shell, which extends from the surface up to 5.7 +/- 0.4 and 6.5 +/- 0.9 A for the disaccharides lactose and trehalose, respectively, and 3.7 +/- 0.9 A for the glucose. This exceeds the values for the static hydration shell as determined, for example, by scattering, where the long-range structure was found to be not significantly affected by the solute beyond the first hydration shell. When comparing all three carbohydrates, we found that the solute-induced change in the THz absorption depends on the product of molar concentration of the solute and the number of hydrogen bonds between the carbohydrate and water molecules. We can conclude that the long-range influence on the sub-picosecond collective water network motions of the hydration water is directly correlated with the average number of hydrogen bonds between the molecule and adjacent water molecules for carbohydrates. This implies that monosaccharides have a smaller influence on the surrounding water molecules than disaccharides. This could explain the bioprotection mechanism of sugar-water mixtures, which has been found to be more effective for disaccharides than for monosaccharides.
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Affiliation(s)
- M Heyden
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum, Germany
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Schröck K, Schröder F, Heyden M, Fischer RA, Havenith M. Characterization of interfacial water in MOF-5 (Zn4(O)(BDC)3)—a combined spectroscopic and theoretical study. Phys Chem Chem Phys 2008; 10:4732-9. [DOI: 10.1039/b807458p] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ortlieb M, Birer Ö, Letzner M, Schwaab GW, Havenith M. Observation of Rovibrational Transitions of HCl, (HCl)2, and H2O−HCl in Liquid Helium Nanodroplets. J Phys Chem A 2007; 111:12192-9. [DOI: 10.1021/jp0759980] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [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)
- M. Ortlieb
- Department of Physical Chemistry II, Ruhr-University Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany
| | - Ö. Birer
- Department of Physical Chemistry II, Ruhr-University Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany
| | - M. Letzner
- Department of Physical Chemistry II, Ruhr-University Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany
| | - G. W. Schwaab
- Department of Physical Chemistry II, Ruhr-University Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany
| | - M. Havenith
- Department of Physical Chemistry II, Ruhr-University Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany
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Havenith M, Hilpert G, Petri M, Urban W. Measurement of the first excited bending state of Ar-CO using a new concentration modulation technique in the jet. Mol Phys 2007. [DOI: 10.1080/00268979400100661] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Rudolph S, Wollny G, von Haeften K, Havenith M. Probing collective excitations in helium nanodroplets: Observation of phonon wings in the infrared spectrum of methane. J Chem Phys 2007; 126:124318. [PMID: 17411134 DOI: 10.1063/1.2709887] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The authors have recorded the nu(3) infrared spectrum of methane in helium nanodroplets using our cw infrared optical parametric oscillator. In a previous paper, Nauta and Miller [Chem. Phys. Lett. 350, 225 (2001)] reported the observation of the monomer rovibrational transitions of methane in helium nanodroplets. Here, they report the observation of additional absorption bands in the frequency range between 2990 and 3070 cm(-1) blueshifted compared to the monomer transitions. They attribute these absorption features to phonon wings of individual rovibrational transitions, i.e., the simultaneous excitation of collective excitation modes of the quantum fluid and the rovibrational excitation of the methane monomer in the helium nanodroplet.
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Affiliation(s)
- S Rudolph
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum, Germany
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Affiliation(s)
- M. Havenith
- a Institut für Angewandte Physik , Wegelerstrasse 8, 5300 , Bonn 1 , Germany
| | - M. Schneider
- a Institut für Angewandte Physik , Wegelerstrasse 8, 5300 , Bonn 1 , Germany
| | - W. Bohle
- a Institut für Angewandte Physik , Wegelerstrasse 8, 5300 , Bonn 1 , Germany
| | - W. Urban
- a Institut für Angewandte Physik , Wegelerstrasse 8, 5300 , Bonn 1 , Germany
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Heugen U, Schwaab G, Bründermann E, Heyden M, Yu X, Leitner DM, Havenith M. Solute-induced retardation of water dynamics probed directly by terahertz spectroscopy. Proc Natl Acad Sci U S A 2006; 103:12301-6. [PMID: 16895986 PMCID: PMC1567875 DOI: 10.1073/pnas.0604897103] [Citation(s) in RCA: 340] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The dynamics of water surrounding a solute is of fundamental importance in chemistry and biology. The properties of water molecules near the surface of a bio-molecule have been the subject of numerous, sometimes controversial experimental and theoretical studies, with some suggesting the existence of rather rigid water structures around carbohydrates and proteins [Pal, S. K., Peon, J., Bagchi, B. and Zewail A. H. (2002) J. Phys. Chem. B 106, 12376-12395]. Hydrogen bond rearrangement in water occurs on the picosecond time scale, so relevant experiments must access these times. Here, we show that terahertz spectroscopy can directly investigate hydration layers. By a precise measurement of absorption coefficients between 2.3 THz and 2.9 THz we could determine the size and the characteristics of the hydration shell. The hydration layer around a carbohydrate (lactose) is determined to extend to 5.13 +/- 0.24 A from the surface corresponding to approximately 123 water molecules beyond the first solvation shell. Accompanying molecular modeling calculations support this result and provide a microscopic visualization. Terahertz spectroscopy is shown to probe the collective modes in the water network. The observed increase of the terahertz absorption of the water in the hydration layer is explained in terms of coherent oscillations of the hydration water and solute. Simulations also reveal a slowing down of the hydrogen bond rearrangement dynamics for water molecules near lactose, which occur on the picosecond time scale. The present study demonstrates that terahertz spectroscopy is a sensitive tool to detect solute-induced changes in the water network.
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Affiliation(s)
- U. Heugen
- *Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum, Germany; and
| | - G. Schwaab
- *Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum, Germany; and
| | - E. Bründermann
- *Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum, Germany; and
| | | | - X. Yu
- Department of Chemistry, University of Nevada, Reno, NV 89557
| | - D. M. Leitner
- Department of Chemistry, University of Nevada, Reno, NV 89557
| | - M. Havenith
- *Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum, Germany; and
- To whom correspondence should be addressed. E-mail:
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Kruse AJ, Havenith M, Arabin B. Comparison of Pregnancy Course and Outcome with Color and Radiographic Angiography of the Placenta in a Monochorionic Triplet Pregnancy. Placenta 2006; 27:517-20. [PMID: 15951016 DOI: 10.1016/j.placenta.2005.04.001] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2005] [Revised: 04/06/2005] [Accepted: 04/06/2005] [Indexed: 11/16/2022]
Abstract
A patient with spontaneous monochorionic (MC) triamniotic triplet pregnancy developed symptoms of feto-fetal-transfusion-syndrome (FFTS) at 18 weeks of gestation with one donor (oligohydramnios) and one receptor (polyhydramnios) triplet. The patient "received" a diet enriched with proteins. Amniotic-fluid volume returned to normal after 24 weeks. At 32 weeks, a Cesarean section was performed due to intra-uterine growth restriction of the donor triplet. Post partum color injection and computer angiograms showed arterio-arterial (AA) anastomoses between all triplets. Deep arterio-venous (AV) anastomoses between the two triplets who had demonstrated with oligo- and polyhydramnios between 18 and 26 weeks were revealed by computer angiography that were not seen by placental color angiogram. Detailed analysis of placental vascular communications by use of color injection angiogram of the chorionic plate and computer angiogram demonstrating deep anastomoses beneath the chorionic plate helps to understand the individual pathophysiology and clinical course in patients with FFTS, which is even more complex in MC triplet compared to MC twin pregnancies.
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Affiliation(s)
- A-J Kruse
- Department of Perinatology, Isala Clinics (Sophia), Dr. v. Heesweg 2, NL-8025 AD, Zwolle, The Netherlands
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von Haeften K, Metzelthin A, Rudolph S, Staemmler V, Havenith M. High-resolution spectroscopy of NO in helium droplets: a prototype for open shell molecular interactions in a quantum solvent. Phys Rev Lett 2005; 95:215301. [PMID: 16384151 DOI: 10.1103/physrevlett.95.215301] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2005] [Indexed: 05/05/2023]
Abstract
We have measured the high-resolution infrared spectrum of the radical NO in the (2)Pi(1/2) state in superfluid helium nanodroplets. The features are attributed to the -doubling splitting and the hyperfine structure. The hyperfine interaction is found to be unaffected by the He solvation. For the Lambda-doubling splitting, we find a considerable increase by 55% compared to the gas phase. This is explained by a confinement of the electronically excited NO states by the surrounding He. The rotational level spacing is decreased to 76% of the gas phase value. The IR transition to the J=1.5 state is found to be homogeneously broadened. We attribute both observations to the coupling between the molecular rotation and phonon/roton excitations in superfluid (4)He droplets.
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Affiliation(s)
- K von Haeften
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum, Germany
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Havenith M. Comment on “Theoretical absorption spectrum of the Ar–CO van der Waals complex” [J. Chem. Phys. 118, 9596 (2003)]. J Chem Phys 2003. [DOI: 10.1063/1.1606671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hecker A, Scheele I, Havenith M. IR-High resolution spectroscopy of the N2O dimer: The torsional modeElectronic supplementary information (ESI) available: List of measured rotational transitions and assignments. See http://www.rsc.org/suppdata/cp/b3/b300733m/. Phys Chem Chem Phys 2003. [DOI: 10.1039/b300733m] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Madeja F, Havenith M. High resolution spectroscopy of carboxylic acid in the gas phase: Observation of proton transfer in (DCOOH)2. J Chem Phys 2002. [DOI: 10.1063/1.1507581] [Citation(s) in RCA: 144] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kunze M, Markwick PRL, Pörtner N, Reuss J, Havenith M. Infrared–microwave double resonance spectroscopy of OCS in pure 4He and mixed 4He/3He clusters. J Chem Phys 2002. [DOI: 10.1063/1.1467330] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Grebenev S, Havenith M, Madeja F, Toennies JP, Vilesov AF. Microwave-infrared double resonance spectroscopy of an OCS molecule inside a 4He droplet. J Chem Phys 2000. [DOI: 10.1063/1.1286243] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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24
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Schmidt C, Perić M, Mürtz P, Wienkoop M, Havenith M, Urban W. Faraday Laser Magnetic Resonance Spectroscopy of Vibrationally Excited C2D. J Mol Spectrosc 1998; 190:112-124. [PMID: 9645931 DOI: 10.1006/jmsp.1998.7563] [Citation(s) in RCA: 5] [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] [Indexed: 05/22/2023]
Abstract
We studied the gas phase spectrum of the deuterated ethynyl radical C2D in the region between 3196 and 3243 cm-1 using a Faraday LMR spectrometer in combination with a CO overtone laser. The C2D radicals were generated in a dc glow discharge containing helium, deuterium, and acetylene. We observed a hot band between two vibronic 2Pi states with an origin at 3225 cm-1. The lower level is assigned to the first excited bending level of the electronic X ground state. The upper level corresponds to the first excited electronic state A at 3513 cm-1, which was observed previously [J. Mol. Struct. 190, 41-60 (1988)]. This region is subject to strong vibronic interaction, caused by mixing of the electronic X ground state with the A state at 3513 cm-1. From the analysis of the spectra we could determine the orbital g factor of the upper level, which gave important information about the mixing ratios. In addition we were able to derive a precise term value for the first excited bending level of the electronic X ground state. The experimentally derived molecular parameters are compared with theoretically calculated values, obtained by ab initio calculations. Copyright 1998 Academic Press.
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Affiliation(s)
- C Schmidt
- Institut für Angewandte Physik, Universität Bonn, Wegelerstrasse 8, Bonn, D-53115, Germany
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25
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Xu Y, Civiš S, McKellar A, König S, Haverlag M, Hilpert G, Havenith M. High-K(‘propeller’) states in the infrared spectrum of the Ar-CO complex. Mol Phys 1996. [DOI: 10.1080/00268979600100741] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Heineking N, Stahl W, Olthof EHT, Wormer PES, van der Avoird A, Havenith M. The nuclear quadrupole coupling constants and the structure of the para–para ammonia dimer. J Chem Phys 1995. [DOI: 10.1063/1.468972] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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28
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Schrander-Stumpel C, Havenith M, Linden EV, Maertzdorf W, Offermans J, van der Harten J. De la Chapelle dysplasia (atelosteogenesis type II): case report and review of the literature [corrected]. Clin Dysmorphol 1994; 3:318-27. [PMID: 7632220] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We report a male infant with de la Chapelle dysplasia (atelosteogenesis type II), a skeletal dysplasia characterized by severe shortening of the long bones, deficient ossification of distinct parts of the skeleton, cleft palate and neonatal death from asphyxia. This is a rare condition with only 10 patients described in the literature. We report the clinical, radiographical and histopathological data and summarize the data on the total of 11 patients. Differential diagnosis with diastrophic dysplasia and atelosteogenesis (type I) is discussed. On clinical and histological grounds we hypothesize that de la Chapelle dysplasia and diastrophic dysplasia are closely related. The mode of inheritance is autosomal recessive.
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Affiliation(s)
- C Schrander-Stumpel
- Department of Clinical Genetics, Academic Hospital Maastricht, The Netherlands
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29
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Lucas CM, Dubelaar ML, Van der Veen FH, Kloosterman-Castro-Ravelo E, Havenith M, Habets J, Van der Nagel T, Penn OC, Wellens HJ. A new stimulation protocol for cardiac assist using the latissimus dorsi muscle. Pacing Clin Electrophysiol 1993; 16:2012-21. [PMID: 7694248 DOI: 10.1111/j.1540-8159.1993.tb00995.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [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] [Indexed: 01/26/2023]
Abstract
When treating severe cardiac failure with dynamic cardiomyoplasty, knowledge about the optimal way of stimulating the latissimus dorsi (LD) muscle is of obvious importance. We evaluated a new stimulation protocol in four goats using in situ electrical stimulation of the left LD muscle. Stimulation was started using a burst of two pulses with an interpulse interval of 100 msec for 50 bursts/min. The number of pulses was increased every 2 weeks concomitant with a decrease in interpulse interval. This resulted after 12 weeks in 60 bursts/min using bursts of six pulses with an interpulse interval of 20 msec after 12 weeks. Force measurements, which were done every 2 weeks, showed an early decrease in contraction and relaxation speed as reflected in the ripple (= interstimulus amplitude/peak force amplitude measured at 10 Hz). Fatigue resistance increased significantly within 4 weeks of conditioning as indicated by preservation of force, positive dF/dt, and negative dF/dt. Full preservation of these variables was seen even during a 1-hour fatigue test at the end of the conditioning period. Skeletal muscle enzyme activity as an indicator of muscle damage showed a significant rise in creatine kinase enzyme activity only on the first day following the start of LD stimulation. LD muscle biopsies revealed almost complete transformation to type I muscle fibers with a significant increase in capillary/fiber ratio when compared to the nonstimulated LD muscle. However, some biopsies, in particular near the electrodes, did show some signs of skeletal muscle damage. Contraction characteristics of the fully transformed LD muscles were tested by increasing the number of bursts of six pulses from 50/min to 100/min. Interpulse intervals of 20 and 33 msec were used. These tests revealed that maximal force, positive dF/dt, and negative dF/dt was reached with 50 bursts/min using a six pulse burst with interpulse intervals of 20 msec.
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Affiliation(s)
- C M Lucas
- Department of Cardiology, Academic Hospital Maastricht, University of Limburg, The Netherlands
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Abstract
OBJECTIVES To obtain information on the long-term effects of dynamic cardiomyoplasty on hemodynamics and muscle histology, this surgical method was evaluated in goats. BACKGROUND Dynamic cardiomyoplasty has been introduced as a new method to treat patients with severe cardiac failure. METHODS In 24 goats, the left latissimus dorsi muscle was wrapped around the heart. The muscle was then subjected to progressive electrical stimulation. In 16 goats, invasive transesophageal Doppler echocardiographic measurements and histologic evaluation of the latissimus dorsi muscle were performed at > or = 12 weeks after the wrapping. RESULTS Only two goats showed an increase in aortic and left and right ventricular pressures concomitant with increased aortic flow during latissimus dorsi muscle stimulation both before and after induction of cardiac failure using imipramine. This was accompanied by a preserved latissimus dorsi muscle structure and nearly complete transformation to type I muscle fibers. The remaining 14 goats showed extensive lipomatosis in the latissimus dorsi muscle, with severe intimal hyperplasia and proliferation of smooth muscle cells in the walls of the thoracodorsal artery and its branches. An increase in endoneural and endomysial connective tissue was observed, with some goats showing destroyed nerve branches near the electrodes. These findings differed from those observed after long-term electrical stimulation of goat latissimus dorsi muscle in situ. CONCLUSIONS Dynamic cardiomyoplasty is of use in the treatment of severe heart failure if the histologic structure of the wrapped latissimus dorsi muscle remains intact. Long-term results in goats suggest that the current approach used in dynamic cardiomyoplasty may lead to deterioration of the wrapped muscle.
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Affiliation(s)
- C M Lucas
- Department of Cardiology, University of Limburg, Maastricht, The Netherlands
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31
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Stals FS, Zeytinoglu A, Havenith M, de Clercq E, Bruggeman CA. Rat cytomegalovirus-induced pneumonitis after allogeneic bone marrow transplantation: effective treatment with (S)-1-(3-hydroxy-2-phosphonyl-methoxypropyl)cytosine. Antimicrob Agents Chemother 1993; 37:218-23. [PMID: 8383939 PMCID: PMC187642 DOI: 10.1128/aac.37.2.218] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Two antiviral compounds, (S)-1-(3-hydroxy-2-phosphonylmethoxypropyl)cytosine (HPMPC) and 9-(1,3-dihydroxy-2-propoxymethyl)guanine (DHPG), were evaluated for their effects on rat cytomegalovirus (RCMV)-induced interstitial pneumonitis after allogeneic bone marrow transplantation (BMTx). Eight-week-old Brown Norway rats immunosuppressed by a lethal dose of total body irradiation were inoculated with RCMV and received allogeneic bone marrow cells from Lewis rats. Animals were treated with either HPMPC (20 mg/kg of body weight as a single dose) or DHPG (20 mg/kg as two daily doses for 5 days). The effect of antiviral therapy was monitored by measuring RCMV titers in different organs and the histopathologic changes in lungs at 8 to 10 days postinfection. In RCMV-infected allogeneic BMTx recipients, severe diffuse thickening of alveolar septa (6.02 microns) with a diffuse infiltration of mononuclear cells occurred, whereas in the noninfected allogeneic BMTx recipients, the septal width was on the order of 2 microns (P < 0.01). Treatment with DHPG (20 mg/kg in two daily doses for 5 days) resulted in a decrease in virus titers (log10 PFU per gram of tissue) in lungs and spleens from 3.81 +/- 0.34 and 4.29 +/- 1.07 (untreated animals) to 1.26 +/- 0.53 and 3.22 +/- 0.27 (treated animals), respectively. Treatment with HPMPC (20 mg/kg as a single dose) resulted in a complete reduction of virus titers in all organs to below the detection level (P < 0.01). Furthermore, antiviral treatment resulted in a reduction of the alveolar septal width from 6.02 +/- 1.59 microns (untreated animals) to 4.67 +/- 1.70 and 3.32 +/- 0.63 microns after DHPG and HPMPC treatment, respectively. Treatment with HPMPC (20 mg/kg as a single dose) resulted in a complete reduction of virus titers in all organs to below the detection level (P <0.01). Furthermore, antiviral treatment resulted in a reduction of the alveolar septal width from 6.02 +/- 1.59 micrometre (untreated animals) to 4.67 +/- 0.63 micrometre after DHPG and HPMPC treatment, respectively. Furthermore, the influx of mononuclear cells in the alveolar septa was significantly impaired after treatment with HPMPC (P <0.01). We conclude that in the described rat model, HPMPC is highly effective in suppressing RCMV-induced interstitial pneumonitis after allogeneic BMTx.
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Affiliation(s)
- F S Stals
- Department of Medical Microbiology, University of Limburg, Maastricht, The Netherlands
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Klöpping-Ketelaars WA, Havenith M, Maertzdorf WJ, Kuipers IM, Blanco CE. The effect of hypocapnia and mechanical pulmonary stress on lung tissue in newborn lambs. Biol Neonate 1993; 64:254-60. [PMID: 8260561 DOI: 10.1159/000243997] [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] [Indexed: 01/29/2023]
Abstract
Positive pressure ventilation, using high inspiratory pressures, often causes lung damage. When associated with hypocapnia, it can produce severe focal alveolar alkalosis and can cause damage in areas of low blood flow. A vein-to-vein extracorporeal membrane oxygenator (ECMO) system was used to control blood gases independently of mechanical ventilation in 12 healthy newborn lambs. After connection to the ECMO system, ventilation was started with a peak inspiratory pressure of 35 cm H2O and a positive end-expiratory pressure of 5 cm H2O; the ventilator rate was 40/min with I:E = 1.5 and FiO2 = 1.0. In 6 of the 12 lambs sweep gases through the silicone membrane were regulated to assure arterial normocapnia. The other 6 were ventilated with the same settings and perfused with the same pump flow, but PaCO2 was allowed to fall to hypocapnic levels. The lambs were ventilated for 4 h. Average pH and PaCO2 were 7.62 +/- 0.14 and 2.11 +/- 0.54 kPa, respectively, in the hypocapnic group and 7.39 +/- 0.11 and 4.79 +/- 0.51 kPa in the normocapnic group. After sacrificing the lambs, the lungs were inspected macroscopically and microscopically by computer-assisted morphometry to assess atelectasis and lung edema. Macroscopically there were no hemorrhages, barotrauma or widespread atelectasis of the lungs in either group. The thickness of interlobular lung septa in the right upper lobe was 32.5 +/- 18.0 microns for the hypocapnic group and 29.7 +/- 12.5 microns for the normocapnic group. The parenchymal-alveolar area ratio in the right upper lobe was 28.4 +/- 5.04 and 24.6 +/- 3.75% in the hypocapnic and normocapnic groups, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
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Bär FW, van Oppen J, de Swart H, van Ommen V, Havenith M, Daemen M, Leenders P, van der Veen FH, van Lankveld M, Verduin M. Percutaneous implantation of a new intracoronary stent in pigs. Am Heart J 1991; 122:1532-41. [PMID: 1957747 DOI: 10.1016/0002-8703(91)90268-m] [Citation(s) in RCA: 10] [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] [Indexed: 12/29/2022]
Abstract
Sixty-two self-expanding parallel wire stainless steel stents were implanted in normal coronary arteries of 31 young pigs using a newly developed delivery system. In 57 of 62 procedures, the percutaneous coronary implant of the stent was successful; five stents were released in side branches. Implants remained in place for a few hours to 6 months. In spite of correct sizing, two stents migrated out of the coronary arteries. Seven pigs died prematurely; in six of them death might be stent-related. Although no anticoagulant and antiplatelet aggregation drugs were administered during the follow-up period, at autopsy thrombi were observed in only seven arteries (nonobstructive in four of seven arteries). All arteries except for three were patent; these three vessels occluded probably due to oversizing of the stent. Complete neointimal coverage was found within 3 weeks. Important hyperplasia was not seen. It was concluded that coronary implantation of this stent usually was easy. Obstructive thrombus formation was rather uncommon despite the absence of chronic anticoagulant and antiplatelet aggregation therapy. Hyperplasia was rare.
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Affiliation(s)
- F W Bär
- Department of Cardiology, Academic Hospital Maastricht, University of Limburg, The Netherlands
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Zacks S, Rosenthal A, Granton B, Havenith M, Opas M, Gotlieb AI. Characterization of Cobblestone mitral valve interstitial cells. Arch Pathol Lab Med 1991; 115:774-9. [PMID: 1863188] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Mitral valve interstitial cells (MVICs) are important in the structure and function of the valve. In a cell culture system that used explants to harvest MVICs, we found that after several passages, some of the cultures at confluence formed a monolayer of cobblestone-shaped cells (CB type). The rest of the cultures were, however, different, consisting of elongated cells (EL type) that formed overlapping orthogonal patterns. When compared with the MVICs-EL, cells from cultures of MVICs-CB were less adherent to a plastic substratum initially than were MVICs-EL and were more sensitive to trypsinization following culture for 3 to 7 days. Ultrastructurally, the cultures of MVICs-CB showed prominent Golgi's complexes and endoplasmic reticulum and fewer microfilaments when compared with those of MVICs-EL. Most strikingly, the CB cells contained much less alpha-smooth-muscle cell actin compared with that of EL cells. The MVICs-CB were not endothelial cells as they did not show the characteristic dense peripheral band that was present in endothelial cells in a confluent monolayer and showed only trace amounts of fluorescence when incubated with 1,1-dioctadecyl 1-3,3,3,3 tetramethyl-indocarbocyanine-percholate (Dil-)--acetylated low-density lipoprotein compared with large amounts of fluorescence with endothelial cells. Cells that were morphologically similar to MVICs-CB were present in the in vivo valve as well and also formed small islands of cells even in the primary cultures that grew out of the explant. The findings supported the hypothesis that MVICs-CB represent a distinct phenotype of the MVICs that is different from that of the MVICs-EL and is not that of either endothelial or medial smooth-muscle cells.
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Affiliation(s)
- S Zacks
- Department of Pathology, Banting and Best Diabetes Centre, Toronto, Ontario, Canada
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35
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Havenith M, Cohen RC, Busarow KL, Gwo D, Lee YT, Saykally RJ. Measurement of the intermolecular vibration–rotation tunneling spectrum of the ammonia dimer by tunable far infrared laser spectroscopy. J Chem Phys 1991. [DOI: 10.1063/1.460562] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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36
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van Lijnschoten G, Havenith M. Early recurrent miscarriage: histology of conception products. Br J Obstet Gynaecol 1991; 98:336. [PMID: 2021583 DOI: 10.1111/j.1471-0528.1991.tb13418.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Gwo DH, Havenith M, Busarow K, Cohen R, Schmuttenmaer C, Saykally R. Tunable far-infrared laser spectroscopy of van der Waals bonds: thejkc= 10← 00Σ bending vibration of Ar-14NH3. Mol Phys 1990. [DOI: 10.1080/00268979000101901] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Abstract
By using a Langendorff-perfused ring of anisotropic rabbit epicardium, sustained reentrant ventricular tachycardia with a cycle length of 168 +/- 13 msec (n = 26) was induced by programmed electrical stimulation. Continuous left ventricular epicardial mapping with 256 simultaneously recorded unipolar electrograms demonstrated that the tachycardia was based on circuital movement of the impulse around a fixed obstacle. Because of the anisotropic properties of the myocardium, the circuit consisted of a ring with segments in which the circulating wave propagated slowly (20 +/- 2 cm/sec) or faster (62 +/- 4 cm/sec). This was related to transverse or longitudinal propagation in relation to fiber direction. In six of 26 experiments, sudden acceleration in rate of the tachycardia was observed during programmed electrical stimulation. This acceleration was caused by the occurrence of double-wave reentry (two successive waves traveling in the same direction and using the same circuit). In one of the experiments, induction of double-wave reentry was only possible at basal conditions but not after the administration of a class III antiarrhythmic drug. In a seventh experiment, induction of double-wave reentry became possible after the administration of a class IC antiarrhythmic drug. Because conduction velocity around the ring was depressed during acceleration, the total revolution time of the circuit during double-wave reentry was about 120% of that during single-wave reentry. Ventricular tachycardias in which double-wave reentry could be elicited had longer cycle lengths (197 +/- 11 vs. 156 +/- 8 msec, p less than 0.001) and larger excitable gaps (71 +/- 16 vs. 28 +/- 5 msec, p less than 0.001) than those not showing this phenomenon. Double-wave reentry might have important clinical implications in understanding ventricular tachycardia acceleration during programmed electrical stimulation, proarrhythmic effects of drugs, and pathophysiology of rapid ventricular tachycardias.
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Affiliation(s)
- J Brugada
- Department of Physiology, University of Limburg, Maastricht, The Netherlands
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40
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Affiliation(s)
- F T Bosman
- Department of Pathology, University of Limburg, Medical Faculty, Maastricht, The Netherlands
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Cohen RC, Busarow KL, Laughlin KB, Blake GA, Havenith M, Lee YT, Saykally RJ. Tunable far infrared laser spectroscopy of van der Waals bonds: Vibration–rotation–tunneling spectra of Ar–H2O. J Chem Phys 1988. [DOI: 10.1063/1.454789] [Citation(s) in RCA: 100] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Havenith M, Bohle W, Werner J, Urban W. Vibration rotation spectroscopy of excited electronic states Faraday-L.M.R. spectroscopy of COa3π. Mol Phys 1988. [DOI: 10.1080/00268978800100723] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Lemery R, Brugada P, Havenith M, Barbour D, Roberts WC, Wellens HJ. Sudden death in hemochromatosis after closed-chest catheter ablation of the atrioventricular junction. Am J Cardiol 1988; 61:941-3. [PMID: 3354476 DOI: 10.1016/0002-9149(88)90385-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- R Lemery
- Department of Cardiology, University of Limburg, University Hospital, Maastricht, the Netherlands
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Abstract
Basement membranes are ubiquitous tissue constituents which occur as supportive structure adjacent to epithelium, endothelium, mesothelium and also around smooth as well as striated muscle cells, Schwann cells and fat cells. In various types of cancer, basement membranes have been extensively studied by electron microscopy. Often basement membrane interruptions were seen in invasive neoplasms but in some tumors the neoplastic cells were surrounded by a continuous basal lamina. Recent immunocytochemical studies have shown that in invasive carcinomas the neoplastic cells often lack a continuous basement membrane. This may be caused by catabolic activity of invasive tumor cells, which have been shown to produce specific collagenases, or by insufficient production and/or extracellular assembly of basement membrane components by the neoplastic epithelial cells. In diagnostic histopathology, immunocytochemical staining of basement membrane components such as type IV collagen and laminin may help to distinguish between noninvasive (benign or in situ) and invasive lesions. Furthermore, in carcinomas the extent of the expression of basement membrane components may be correlated with the degree of differentiation of the neoplastic cells. Finally, in soft tissue tumors, basement membrane staining may be helpful for the differentiation of basement membrane producing neoplasms (e.g. of vascular, neural, smooth muscle or striated muscle origin) from non-basement membrane producing neoplasms (e.g. of fibroblastic origin).
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