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Tokurakawa M, Shirakawa A, Ueda K, Peters R, Fredrich-Thornton ST, Petermann K, Huber G. Ultrashort pulse generation from diode pumped mode-locked Yb3+:sesquioxide single crystal lasers. OPTICS EXPRESS 2011; 19:2904-2909. [PMID: 21369112 DOI: 10.1364/oe.19.002904] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We present diode pumped SESAM supported Kerr-lens mode locked laser operation based on Yb3+:Sc2O3 and Yb3+:Lu2O3 single crystals. Pulses as short as 71 fs with an average power of 1.09 W were obtained from an Yb3+:Lu2O3 single crystal. Yb3+:Sc2O3 delivered pulses as short as 81 fs with an average power of 840 mW. The mode locked laser operation was stable for longer than 2 hours.
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Gurrin L, Martin P, Koplin J, Peters R, Osborne N, Bertalli N, Matheson M, Lowe A, Ponsonby A, Wake M. Can Skin Prick Testing Thresholds Replace Oral Food Challenges In Population-based Studies And Community Screening Of Infants? J Allergy Clin Immunol 2011. [DOI: 10.1016/j.jaci.2011.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Beckett N, Peters R, Tuomilehto J, Swift C, Sever P, Potter J, McCormack T, Forette F, Gil-Extremera B, Dumitrascu D, Staessen JA, Thijs L, Fletcher A, Bulpitt C. Immediate and late benefits of treating very elderly people with hypertension: results from active treatment extension to Hypertension in the Very Elderly randomised controlled trial. BMJ 2011; 344:d7541. [PMID: 22218098 DOI: 10.1136/bmj.d7541] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVE To assess if very elderly people with hypertension obtain early benefit from antihypertensive treatment. DESIGN One year open label active treatment extension of randomised controlled trial (Hypertension in the Very Elderly Trial (HYVET)). SETTING Hospital and general practice based centres mainly in eastern and western Europe, China, and Tunisia. PARTICIPANTS People on double blind treatment at the end of HYVET were eligible to enter the extension. INTERVENTIONS Participants on active blood pressure lowering treatment continued taking active drug; those on placebo were given active blood pressure lowering treatment. The treatment regimen was as used in the main trial-indapamide SR 1.5 mg (plus perindopril 2-4 mg if required)-with the same target blood pressure of less than 150/80 mm Hg. MAIN OUTCOME MEASURES The primary outcome was all stroke; other outcomes included total mortality, cardiovascular mortality, and cardiovascular events. RESULTS Of 1882 people eligible for entry to the extension, 1712 (91%) agreed to participate. During the extension period, 1682 patient years were accrued. By six months, the difference in blood pressure between the two groups was 1.2/0.7 mm Hg. Comparing people previously treated with active drug and those previously on placebo, no significant differences were seen for stroke (n = 13; hazard ratio 1.92, 95% confidence interval 0.59 to 6.22) or cardiovascular events (n = 25; 0.78, 0.36 to 1.72). Differences were seen for total mortality (47 deaths; hazard ratio 0.48, 0.26 to 0.87; P = 0.02) and cardiovascular mortality (11 deaths; 0.19, 0.04 to 0.87; P = 0.03). CONCLUSION Very elderly patients with hypertension may gain immediate benefit from treatment. Sustained differences in reductions of total mortality and cardiovascular mortality reinforce the benefits and support the need for early and long term treatment. Trial registration Clinical trials NCT00122811.
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Hwang R, Chuan F, La J, Fung A, Peters R, Kuys S. Prevalence of Urinary Incontinence in People with Chronic Heart Failure. Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Boyde M, Song S, Peters R, Turner C, Thompson D, Stewart S. Self-care Education for People with Chronic Heart Failure. Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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106
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Peters R, Brünger A, Schulten K. Continuous fluorescence microphotolysis: A sensitive method for study of diffusion processes in single cells. Proc Natl Acad Sci U S A 2010; 78:962-6. [PMID: 16592981 PMCID: PMC319925 DOI: 10.1073/pnas.78.2.962] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Continuous fluorescence microphotolysis is a sensitive method for the study of translational diffusion in the plasma membrane of single living cells and related systems. In this communication the conceptual basis of the method and its theoretical framework and experimental realization, as well as applications, are reported. In continuous fluorescence microphotolysis a microscopic membrane area of a single fluorescently labeled cell is irradiated by a laser beam while the fluorescence emitted from the area is monitored. The decay of the measuring signal reflects the competition of two processes: (i) the elimination of fluorophores by irreversible photolysis, and (ii) the entrance of new fluorophores into the area by diffusion. Rate constants for the two processes can be derived from the measuring data by mathematical analysis. As compared to our initial approach, fluorescence microphotolysis [Peters, R., Peters, J., Tews, K. H. & Bähr, W. (1974) Biochim. Biophys. Acta 367, 282-294], the main advantage of the method described here is an improvement of data quality and detection limit by orders of magnitude. From the practical point of view the main advantage is a simplification of the experimental setup. Results obtained by this method are encouraging and support the contention that continuous fluorescence microphotolysis may disclose new aspects of diffusion processes in biological systems.
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108
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Peters R, Itti L. Integrating low-level and high-level visual influences on eye movement behavior. J Vis 2010. [DOI: 10.1167/7.9.949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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109
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Cushing T, Barnard S, Fleis R, Peters R. Pseudoangiomatous Squamous Cell Carcinoma in the Oral Cavity of a Dog. J Vet Diagn Invest 2010; 22:299-302. [DOI: 10.1177/104063871002200225] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
An 8-year-old, spayed, female Labrador Retriever mixed-breed dog was presented to the Cornell University Hospital for Animals with an invasive oral mass involving the upper left fourth premolar and first molar teeth. Initial biopsy results suggested a poorly differentiated squamous cell carcinoma, whereas further histologic examination of the surgically removed mass revealed a hemangiosarcoma-like mass composed of numerous vascular clefts and variable numbers of keratinizing epithelial cells. Histologic and immunohistochemical characteristics were compatible with pseudoangiomatous squamous cell carcinoma, a well-recognized human variant of acanthomatous squamous cell carcinoma. Because of histomorphologic similarities with canine gingival hemangiosarcoma, diagnosticians should be aware of the present tumor variant as a differential diagnosis for vascular-like growths in the oral cavity of dogs.
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Hwang R, Porteous H, Chuan F, Peters R, Korczyk D. Long-Term Effectiveness of Centre-Based Exercise Program in Patients with Chronic Heart Failure. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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111
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Chuan F, Peters R, Beswick T, Weglowski M, Korczyk D. Facilitating Optimum Doses of Heart Failure Medications: Evaluation of a Heart Failure Medication Titration Form. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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112
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González FI, Geist EL, Jaffe B, Kânoğlu U, Mofjeld H, Synolakis CE, Titov VV, Arcas D, Bellomo D, Carlton D, Horning T, Johnson J, Newman J, Parsons T, Peters R, Peterson C, Priest G, Venturato A, Weber J, Wong F, Yalciner A. Probabilistic tsunami hazard assessment at Seaside, Oregon, for near- and far-field seismic sources. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jc005132] [Citation(s) in RCA: 189] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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113
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Peters R. XVI. Ueber Erkrankungen des Rückenmarks bei hereditär-syphilitischen Neugeborenen und Säuglingen. Dermatology 2009. [DOI: 10.1159/000241912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Baer CRE, Kränkel C, Saraceno CJ, Heckl OH, Golling M, Südmeyer T, Peters R, Petermann K, Huber G, Keller U. Femtosecond Yb:Lu(2)O(3) thin disk laser with 63 W of average power. OPTICS LETTERS 2009; 34:2823-2825. [PMID: 19756117 DOI: 10.1364/ol.34.002823] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We present successful power-scaling of an Yb:Lu(2)O(3) thin disk laser to record high-power levels both in cw and mode-locked operation. In a simple multimode resonator we achieved 149 W of output power in cw operation with 73% optical-to-optical efficiency (eta(opt)). Building an 81 MHz fundamental transverse mode resonator with dispersion compensation and a semiconductor saturable absorber mirror (SESAM) for passive mode locking we achieved 63 W of average power in 535 fs pulses (eta(opt)=35%). The output beam is nearly diffraction limited (M(2)<1.2). The 0.78 microJ pulses with a peak power of 1.28 MW had a central wavelength of 1034 nm and were close to the Fourier transform limit. With an SESAM with a larger modulation depth we obtained pulses as short as 329 fs at 40 W average power corresponding to a pulse energy of 0.49 microJ and a peak power of 1.32 MW.
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Peters R. Ueber die Entzündung des extraduralen Gewebes des Rückenmarks bei der Genickstarre. Dtsch Med Wochenschr 2009. [DOI: 10.1055/s-0029-1188558] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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116
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Latz J, Peters R, Pasel J, Datsevich L, Jess A. Hydrodesulfurization of jet fuel by pre-saturated one-liquid-flow technology for mobile fuel cell applications. Chem Eng Sci 2009. [DOI: 10.1016/j.ces.2008.10.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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117
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Goschnick J, Lipp M, Ache HJ, Thomas H, Kaufmann R, Peters R, Höcker H. Afterchrome dyeing of wool. Part B — characterisation of chromium‐treated wool by secondary particle mass spectrometry. ACTA ACUST UNITED AC 2008. [DOI: 10.1111/j.1478-4408.1992.tb01438.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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118
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Thomas H, Kaufmann R, Peters R, Höcker H, Lipp M, Goschnick J, Ache HJ. Afterchrome dyeing of wool. Part A — chromium in the effluent, analytical determination and characterisation of influencing factors. ACTA ACUST UNITED AC 2008. [DOI: 10.1111/j.1478-4408.1992.tb01437.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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119
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Peters R, Tonoli D, van Duin M, Mommers J, Mengerink Y, Wilbers A, van Benthem R, de Koster C, Schoenmakers P, van der Wal S. Low-molecular-weight model study of peroxide cross-linking of ethylene-propylene (-diene) rubber using gas chromatography and mass spectrometry. J Chromatogr A 2008; 1201:141-50. [DOI: 10.1016/j.chroma.2008.03.092] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2008] [Revised: 03/27/2008] [Accepted: 03/28/2008] [Indexed: 11/25/2022]
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120
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Peters R, van Duin M, Tonoli D, Kwakkenbos G, Mengerink Y, van Benthem R, de Koster C, Schoenmakers P, van der Wal S. Low-molecular-weight model study of peroxide cross-linking of ethylene–propylene–diene rubber using gas chromatography and mass spectrometry. J Chromatogr A 2008; 1201:151-60. [DOI: 10.1016/j.chroma.2008.05.067] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2008] [Revised: 05/14/2008] [Accepted: 05/19/2008] [Indexed: 10/22/2022]
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Peters R. Some metabolic aspects of fluoroacetate especially related to fluorocitrate. CIBA FOUNDATION SYMPOSIUM 2008; 2:55-76. [PMID: 5212159 DOI: 10.1002/9780470719855.ch4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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122
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Alkhatib E, Peters R. Wet weather impact on trihalomethane formation potential in tributaries to drinking water reservoirs. ENVIRONMENTAL MONITORING AND ASSESSMENT 2008; 139:173-81. [PMID: 17564794 DOI: 10.1007/s10661-007-9823-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2006] [Accepted: 05/11/2007] [Indexed: 05/15/2023]
Abstract
During rain storm events, land surface runoff and resuspension of bottom sediments cause an increase in Trihalomethane (THM) precursors in rivers. These precursors, when chlorinated at water treatment facilities will lead to the formation of THMs and hence impact drinking water resources. In order to evaluate the wet weather impact on the potential formation of THMs, river samples were collected before, during and after three rain storms ranging from 15.2 to 24.9 mm precipitation. The samples were tested for THM formation potential and other indicators including UV254 absorbance, turbidity and volatile suspended solid (VSS). Average levels of THMs increased from 61 microg/l during dry weather to 131 microg/l during wet weather, and then went back to 81 microg/l after rain ended. Wet weather values of THM are well above the maximum contaminant level (MCL) 80 microg/l, set by EPA for drinking water. THM indicators also exhibited similar trends. Average levels increased from 0.6 to 1.8 abs; 2.6 to 6 ntu; and 7.5 to 15 mg/l respectively for UV254, turbidity and VSS. A positive correlation was observed between THM formation and THM indicators. The t-test of significance (p-value) was less than 0.05 for all indicators, and R values ranged from 0.85 to 0.92 between THMs and the indicators, and 0.72 to 0.9 among indicators themselves.
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Nyst HJ, van Veen RLP, Tan IB, Peters R, Spaniol S, Robinson DJ, Stewart FA, Levendag PC, Sterenborg HJCM. Performance of a dedicated light delivery and dosimetry device for photodynamic therapy of nasopharyngeal carcinoma: phantom and volunteer experiments. Lasers Surg Med 2008; 39:647-53. [PMID: 17886277 DOI: 10.1002/lsm.20536] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
UNLABELLED The objective of this study was to develop a light delivery and measurement device for photodynamic therapy (PDT) in the nasopharyngeal cavity, which achieves a homogeneous and reproducible fluence rate distribution to a target area and provides proper shielding of predefined risk areas. MATERIALS AND METHODS A flexible silicone applicator was developed, incorporating light delivery and dosimetry fibers. The applicator can be inserted through the mouth and fixed in the nasopharyngeal cavity. Tissue optical phantoms were prepared on the basis of optical properties measured in vivo using diffuse reflectance spectroscopy (DRS). The fluence rate over the length of the applicator surface was measured in air, in tissue optical phantoms and in five healthy volunteers. RESULTS The fluence rate distribution over the applicator surface in air and tissue optical phantom was found to be more homogeneous (SD/mean 3.8% and 18.3%, respectively) than the fluence rate distribution in five volunteers (SD/mean ranging from 19% up to 52%). The maximum observed fluence rate build-up in the nasopharynx varied between subjects and ranged from a factor of 4.1-6.9. Shielding of the risk area such as the soft palate and tongue was effective. CONCLUSIONS In air and in tissue optical phantoms the fluence rate distribution of the device was highly homogeneous. The observed inter-subject and intra-subject variations in fluence rate in healthy volunteers originated from differences in optical properties and nasopharyngeal geometry. Light delivery based on a single tissue surface measurement will not be adequate. In situ dosimetric measurements are required to determine the light fluence delivered to a geometrically complex site such as the nasopharynx. These observations should be taken in consideration when developing light applicators for PDT of the nasopharynx and other non-uniform surfaces.
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Marchese SV, Baer CRE, Peters R, Kränkel C, Engqvist AG, Golling M, Maas DJHC, Petermann K, Südmeyer T, Huber G, Keller U. Efficient femtosecond high power Yb:Lu(2)O(3) thin disk laser. OPTICS EXPRESS 2007; 15:16966-16971. [PMID: 19550987 DOI: 10.1364/oe.15.016966] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We demonstrate the first passively mode-locked thin disk laser based on Yb:Lu(2)O(3). The laser generates 370-fs pulses with 20.5 W of average power in a diffraction-limited beam (M(2) < 1.1). The nearly transform-limited pulses have a spectral bandwidth of 3.4 nm centered near 1034 nm. With slightly longer pulses (523 fs) we obtained 24 W of average power at a pump power of 56 W, resulting in an optical-to-optical efficiency of 43%, which is higher than for any previously mode-locked thin disk laser.
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Peters R, Witt J, Boyde M. Bridging the Gap: Outreach to Rural and Remote Southern Queensland through MSOAP. Heart Lung Circ 2007. [DOI: 10.1016/j.hlc.2007.06.465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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