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Mano CP, Chapelle C, Kabakian ADM, Gross P, Paradis H, Delaune O, Patryl L. Algorithm development for low level radioxenon 2D spectra analysis: A first case of study using spectral unmixing for a β-γ detector. Appl Radiat Isot 2024; 203:111079. [PMID: 37951035 DOI: 10.1016/j.apradiso.2023.111079] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 10/13/2023] [Accepted: 10/20/2023] [Indexed: 11/13/2023]
Abstract
In the scope of the verification regime of the Comprehensive nuclear Test Ban Treaty, the CEA/DAM is developing new β-γ measurement systems. In order to improve the analysis methods at low statistics, a new multiplicative spectral unmixing algorithm for full-spectrum analysis was tested on a particular setup for different types of mixtures. The reconstructed activities for simulated spectra and the characteristic limits found with this algorithm are compared to the classic ROI analysis method.
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Affiliation(s)
- C P Mano
- Atomic Energy and Alternative Energies Commission, DAM DIF, F-91297, Arpajon, France.
| | - C Chapelle
- Atomic Energy and Alternative Energies Commission, DAM DIF, F-91297, Arpajon, France
| | | | - P Gross
- Atomic Energy and Alternative Energies Commission, DAM DIF, F-91297, Arpajon, France
| | - H Paradis
- Atomic Energy and Alternative Energies Commission, DAM DIF, F-91297, Arpajon, France
| | - O Delaune
- Atomic Energy and Alternative Energies Commission, DAM DIF, F-91297, Arpajon, France
| | - L Patryl
- Atomic Energy and Alternative Energies Commission, DAM DIF, F-91297, Arpajon, France
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2
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Shaya S, Gross P, Westrick R. OC4. Abstract Title: Thrombus Stability Explains the Factor V Leiden Paradox: A Mouse Model. Thromb Res 2019. [DOI: 10.1016/j.thromres.2019.09.023] [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: 11/26/2022]
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3
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Dai Y, Gross P. P3. Abstract Title: A Point-of-Care Assay for Measuring Thrombin Activity in Finger-Prick Whole Blood. Thromb Res 2019. [DOI: 10.1016/j.thromres.2019.09.012] [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: 10/25/2022]
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4
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Anderson D, Dunbar M, Murnaghan J, Kahn S, Gross P, Forsythe M. Aspirin or Rivaroxaban for VTE Prophylaxis After Hip or Knee Arthroplasty. J Vasc Surg Venous Lymphat Disord 2018. [DOI: 10.1016/j.jvsv.2018.07.002] [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: 10/28/2022]
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5
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Teitel JM, Gross P, Blake P, Garvey MB. A Bioluminescent Adenosine Nucleotide Release Assay for the Diagnosis of Heparin-Induced Thrombocytopenia. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1650606] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- J M Teitel
- The Department of Medicine, Division of Hematology, St. Michael’s Hospital, Toronto, and the University of Toronto, Toronto, Ontario, Canada
| | - P Gross
- The Department of Medicine, Division of Hematology, St. Michael’s Hospital, Toronto, and the University of Toronto, Toronto, Ontario, Canada
| | - P Blake
- The Department of Medicine, Division of Hematology, St. Michael’s Hospital, Toronto, and the University of Toronto, Toronto, Ontario, Canada
| | - M B Garvey
- The Department of Medicine, Division of Hematology, St. Michael’s Hospital, Toronto, and the University of Toronto, Toronto, Ontario, Canada
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Delaune O, Cagniant A, Gross P, Douysset G, Fontaine JP, Le Petit G. Low-level laboratory measurement of xenon radionuclides: Electron-photon versus photon measurements. Appl Radiat Isot 2017; 134:450-454. [PMID: 28743410 DOI: 10.1016/j.apradiso.2017.07.021] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Revised: 07/10/2017] [Accepted: 07/11/2017] [Indexed: 11/16/2022]
Abstract
Radioactive xenon (mainly 131mXe, 133Xe, 133mXe and 135Xe) are tracked as markers of nuclear weapons testing. The CEA has developed the PIPSBox, a measurement cell able to detect electrons emitted by xenon nuclides. Combined with an ultra-low background γ spectrometer, electron detection capacities allow reaching minimum detectable activities (MDA) for a 3-day long measurement of about 0.5mBq for the four xenon radionuclides. Compared to a classical measurement cell, MDAs are improved by a factor of 2-4.
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Affiliation(s)
- O Delaune
- CEA, DAM, DIF, F-91297 Arpajon, France.
| | | | - P Gross
- CEA, DAM, DIF, F-91297 Arpajon, France
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Cagniant A, Delaune O, Réglat M, Douysset G, Gross P, Le Petit G. Ground surface ultralow background spectrometer: Active shielding improvements and coincidence measurements for the Gamma 3 spectrometer. Appl Radiat Isot 2017; 126:197-200. [PMID: 28187930 DOI: 10.1016/j.apradiso.2017.01.044] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 01/05/2017] [Accepted: 01/25/2017] [Indexed: 11/28/2022]
Abstract
The ultralow background versatile spectrometer GAMMA3 has been optimized with the following shielding improvements: (i) optimized nitrogen injection flux of 300Lh-1, and (ii) cosmic veto configuration with 9 scintillating plates. These improvements allow a reduction of 39% of the normalized integral background count rate down to 2.7±0.2min-1kgGe-1 (40-2500keV energy range). Minimum Detectable Activities when performing direct γ-ray spectrometry or γ-γ coincidence spectrometry are compared.
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Affiliation(s)
| | - O Delaune
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - M Réglat
- CEA, DAM, DIF, F-91297 Arpajon, France
| | | | - P Gross
- CEA, DAM, DIF, F-91297 Arpajon, France
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Le Petit G, Cagniant A, Gross P, Douysset G, Topin S, Fontaine J, Taffary T, Moulin C. Spalax™ new generation: A sensitive and selective noble gas system for nuclear explosion monitoring. Appl Radiat Isot 2015; 103:102-14. [DOI: 10.1016/j.apradiso.2015.05.019] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Revised: 04/14/2015] [Accepted: 05/27/2015] [Indexed: 11/30/2022]
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Cagniant A, Le Petit G, Nadalut B, Gross P, Richard-Bressand H, Fontaine JP, Douysset G. On the use of (127)Xe standards for the quality control of CTBTO noble gas stations and support laboratories. Appl Radiat Isot 2014; 89:176-85. [PMID: 24657473 DOI: 10.1016/j.apradiso.2014.02.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Revised: 02/04/2014] [Accepted: 02/05/2014] [Indexed: 11/16/2022]
Abstract
(127)Xe has a longer half-life than (131m)Xe, it can be easily purely produced and it is present in the environment at very low level. For these reasons, (127)Xe is supposed to be a convenient quality control radionuclide for remote noble gas stations of the International Monitoring System (IMS) network. As CEA/DAM has recently developed two new photon/electron setups for low-level detection of (131m)Xe, (133m)Xe, (133)Xe and (135)Xe, we took the opportunity to test these setups for the measurement of a (127)Xe standard. The results and a detailed description of these measurements are presented in this paper. They illustrate the complexity of (127)Xe decay, emitting simultaneously several γ, X-rays, conversion electrons and Auger electrons; this results in highly summated coincidence spectra. The measurements performed provide precise electron energy calibration of the setups. The count rate of electrons in coincidence with iodine Kα X-rays was found to be surprisingly low, leading to the study of electron-gated photon spectrum. Finally, a comparison of three photon/electron coincidence spectra obtained with three different setups is given. The use of (127)Xe as a standard for energy calibration of IMS noble gas station is possible, but it appears to be quite complicated for efficiency check of noble gas station equipped with β/γ detectors.
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Affiliation(s)
| | | | - B Nadalut
- Preparatory Commission for the Comprehensive Nuclear Test Ban Treaty Organization, Provisional Technical Secretariat, P.O. Box 1200, 1400 Vienna, Austria
| | - P Gross
- CEA, DAM, DIF, F-91297 Arpajon, France
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Cagniant A, Le Petit G, Gross P, Douysset G, Richard-Bressand H, Fontaine JP. Improvements of low-level radioxenon detection sensitivity by a state-of-the art coincidence setup. Appl Radiat Isot 2013; 87:48-52. [PMID: 24332879 DOI: 10.1016/j.apradiso.2013.11.078] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Accepted: 11/20/2013] [Indexed: 11/29/2022]
Abstract
The ability to quantify isotopic ratios of 135, 133 m, 133 and 131 m radioxenon is essential for the verification of the Comprehensive Nuclear-Test Ban Treaty (CTBT). In order to improve detection limits, CEA has developed a new on-site setup using photon/electron coincidence (Le Petit et al., 2013. J. Radioanal. Nucl. Chem., DOI : 10.1007/s 10697-013-2525-8.). Alternatively, the electron detection cell equipped with large silicon chips (PIPS) can be used with HPGe detector for laboratory analysis purpose. This setup allows the measurement of β/γ coincidences for the detection of (133)Xe and (135)Xe; and K-shell Conversion Electrons (K-CE)/X-ray coincidences for the detection of (131m)Xe, (133m)Xe and (133)Xe as well. Good energy resolution of 11 keV at 130 keV and low energy threshold of 29 keV for the electron detection were obtained. This provides direct discrimination between K-CE from (133)Xe, (133m)Xe and (131m)Xe. Estimation of Minimum Detectable Activity (MDA) for (131m)Xe is in the order of 1mBq over a 4 day measurement. An analysis of an environmental radioxenon sample using this method is shown.
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Affiliation(s)
| | | | - P Gross
- CEA, DAM, DIF, F-91297 Arpajon, France
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Douysset G, Petit GL, Gross P, Jutier C. Long-term performances of the ⁹⁵ZR/⁹⁵Nb chronometer for nuclear events dating. Appl Radiat Isot 2013; 87:152-6. [PMID: 24326315 DOI: 10.1016/j.apradiso.2013.11.079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Accepted: 11/20/2013] [Indexed: 11/16/2022]
Abstract
The present work reports on a long-term analysis of the performances of the (95)Zr/(95)Nb chronometer for dating a nuclear event. Taking benefit of a recent Profiency Test Exercise, a sample containing a standardized mixture of fission products has been measured repeatedly with a low background HPGe spectrometer during a period extending up to one year with the aim of assessing the accuracy of the various zero-time determinations. Evaluation of the uncertainties associated to these evaluations was performed using a Monte Carlo approach. Input parameters sensitivity has been investigated, especially the influence of the (95m)Nb decay branch. The (95)Zr/(95)Nb chronometer was found to be accurate for zero-time determination within one day and one week for a decay of 3 months and 10 months respectively. Sub-day uncertainties are achievable for a two months old sample whereas sub-week uncertainties are reached after a decay of six months. Limitations of the technique for dating a real event are investigated.
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Affiliation(s)
| | | | - P Gross
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - C Jutier
- CEA, DAM, DIF, F-91297 Arpajon, France
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Liapikou A, Polverino E, Cilloniz C, Peyrani P, Ramirez J, Menendez R, Torres A, Nakamatsu R, Arnold F, Allen M, Broch G, Bordon J, Gross P, Weiss K, Legnani D, Bodi M, Porras J, Torres A, Lode H, Roig J, Benchetrit G, Gonzalez J, Videla A, Corral J, Martinez J, Rodriguez E, Rodriguez M, Victorio C, Levy G, Arteta F, Fuenzalida AD, Parada M, Luna J. A Worldwide Perspective of Nursing Home-Acquired Pneumonia Compared With Community-Acquired Pneumonia. Respir Care 2013; 59:1078-85. [DOI: 10.4187/respcare.02788] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Gross P. Ist eine Hyponatriämie ein Prognoseindikator? – Rolle der Hyponatriämie bleibt weitgehend ungeklärt. Dtsch Med Wochenschr 2013; 138:116. [DOI: 10.1055/s-0032-1329032] [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: 10/27/2022]
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Le Petit G, Cagniant A, Morelle M, Gross P, Achim P, Douysset G, Taffary T, Moulin C. Innovative concept for a major breakthrough in atmospheric radioactive xenon detection for nuclear explosion monitoring. J Radioanal Nucl Chem 2013. [PMID: 26224943 PMCID: PMC4513906 DOI: 10.1007/s10967-013-2525-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The verification regime of the comprehensive test ban treaty (CTBT) is based on a network of three different waveform technologies together with global monitoring of aerosols and noble gas in order to detect, locate and identify a nuclear weapon explosion down to 1 kt TNT equivalent. In case of a low intensity underground or underwater nuclear explosion, it appears that only radioactive gases, especially the noble gas which are difficult to contain, will allow identification of weak yield nuclear tests. Four radioactive xenon isotopes, 131mXe, 133mXe, 133Xe and 135Xe, are sufficiently produced in fission reactions and exhibit suitable half-lives and radiation emissions to be detected in atmosphere at low level far away from the release site. Four different monitoring CTBT systems, ARIX, ARSA, SAUNA, and SPALAX™ have been developed in order to sample and to measure them with high sensitivity. The latest developed by the French Atomic Energy Commission (CEA) is likely to be drastically improved in detection sensitivity (especially for the metastable isotopes) through a higher sampling rate, when equipped with a new conversion electron (CE)/X-ray coincidence spectrometer. This new spectrometer is based on two combined detectors, both exhibiting very low radioactive background: a well-type NaI(Tl) detector for photon detection surrounding a gas cell equipped with two large passivated implanted planar silicon chips for electron detection. It is characterized by a low electron energy threshold and a much better energy resolution for the CE than those usually measured with the existing CTBT equipments. Furthermore, the compact geometry of the spectrometer provides high efficiency for X-ray and for CE associated to the decay modes of the four relevant radioxenons. The paper focus on the design of this new spectrometer and presents spectroscopic performances of a prototype based on recent results achieved from both radioactive xenon standards and air sample measurements. Major improvements in detection sensitivity have been reached and quantified, especially for metastable radioactive isotopes 131mXe and 133mXe with a gain in minimum detectable activity (about 2 × 10−3 Bq) relative to current CTBT SPALAX™ system (air sampling frequency normalized to 8 h) of about 70 and 30 respectively.
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Affiliation(s)
| | | | - M Morelle
- Canberra Semiconductor NV, Olen, Belgium
| | - P Gross
- CEA, DAM, DIF, 91297 Arpajon, France
| | - P Achim
- CEA, DAM, DIF, 91297 Arpajon, France
| | | | - T Taffary
- CEA, DAM, DIF, 91297 Arpajon, France
| | - C Moulin
- CEA, DAM, DIF, 91297 Arpajon, France
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Pistrosch F, Passauer J, Herbrig K, Schwanebeck U, Gross P, Bornstein SR. Effect of thiazolidinedione treatment on proteinuria and renal hemodynamic in type 2 diabetic patients with overt nephropathy. Horm Metab Res 2012; 44:914-8. [PMID: 22723267 DOI: 10.1055/s-0032-1314836] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [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: 10/28/2022]
Abstract
Proteinuria in diabetic nephropathy predicts the progressive loss of glomerular filtration rate (GFR) and serves as independent predictor for mortality. We performed the present study (ClinicalTrials.gov identifier: NCT 00324675) to clarify whether the activation of PPARγ receptor by thiazolidinediones was able to improve proteinuria and preserve renal function in advanced diabetic nephropathy. A total of 28 type 2 diabetic patients (4 women and 24 men, mean age 66.1±9.1 years) with urinary albumin excretion >300 mg/24 h and an estimated GFR <60 ml/min were included into this prospective double blind trial to receive either rosiglitazone (RSG) 4 mg b.i.d or matching placebo (PLC) for 52 weeks in addition to their concomitant antidiabetic background therapy. At baseline and after 26 and 52 weeks, renal plasma flow (RPF) and GFR were determined before and after blockade of nitric oxide (NO) by intravenous administration of N-monomethyl-L-arginine acetate. RSG treatment resulted in a significant reduction of proteinuria (2.4±1.1; 1.2±0.6; 1.5±0.7 g/d at baseline, 26 weeks and 52 weeks; respectively, p<0.05) whereas PLC did not influence proteinuria (1.6±0.6; 1.6±0.8; 1.7±0.8 g/d). GFR and RPF did not change significantly during the study, however, RSG improved the intrarenal NO bioavailability. RSG treatment was generally well tolerated and the major adverse event - development of edema - could be controlled by dose adjustment of the study drug and diuretic agents. In conclusion, we demonstrated a possible renoprotective effect of RSG in patients with advanced diabetic nephropathy.
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Affiliation(s)
- F Pistrosch
- Medical Clinic III, Department of Internal Medicine, University Hospital Carl Gustav Carus, Dresden, Germany.
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Abstract
Hyponatremia is the most common electrolyte disorder in the hospital setting and is defined as a serum sodium concentration less than 135 mmol/l. Most patients have mild hyponatremia (plasma sodium concentration 130-134 mmol/l) and few if any symptoms. Serum sodium concentrations between 120 and 129 mmol/l can be associated with lack of concentration, nausea, forgetfulness, apathy and loss of balance. Severe hyponatremia (<120 mmol/l) can cause coma or grand mal seizure. If hyponatremia occurs acutely (duration <48 h) it will cause more severe symptoms than are observed in chronic hyponatremia (>48 h). It is important to distinguish between different types of hyponatremia: euvolemic hyponatremia causing syndrome of inappropriate antidiuretic hormone secretion(SIADH) also known as Schwartz-Bartter syndrome, hypervolemic hyponatremia (cardiac failure and liver cirrhosis) and hypovolemic hyponatremia (diarrhoea, vomiting or other gastrointestinal fluid losses). Increased levels of ADH and continued fluid intake are the pathogenetic causes of all three types of hyponatremia; nonetheless, infusion of isotonic fluid is the therapy of choice for hypovolemic hyponatremia. In contrast, fluid restriction, lithium carbonate, urea, loop diuretics or demeclocycline have been used as therapeutic options to correct hyponatremia in euvolemic or hypervolemic hyponatremia but most of these therapies have proven to be cumbersome and inefficient. Recently a new class of pharmacological agents has become available, the vaptans, orally taken vasopressin antagonists. Clinical trials showed them to provide effective, specific and safe therapy of hyponatremia. In Europe tolvaptan, the only such agent on the market is now approved for the treatment of euvolemic hyponatremia.
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Affiliation(s)
- S Heinrich
- Medizinische Klinik III/Abteilung Nephrologie, Universitätsklinikum Carl Gustav Carus, Fetscherstrasse 74, Dresden, Germany.
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Gold C, Gross P, Peyker L, Eickerling G, Simeoni GG, Stockert O, Kampert E, Wolff-Fabris F, Michor H, Scheidt EW. Interplay between crystal field splitting and Kondo effect in CeNi9Ge(4-x)Si(x). J Phys Condens Matter 2012; 24:355601. [PMID: 22885655 DOI: 10.1088/0953-8984/24/35/355601] [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] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The pseudo-ternary solid solution CeNi(9)Ge(4-x)Si(x) (0 ≤ x ≤ 4) has been investigated by means of x-ray diffraction, magnetic susceptibility, specific heat, electrical resistivity, thermopower and inelastic neutron scattering studies. The isoelectronic substitution of germanium by silicon atoms causes a dramatic change of the relative strength of competing Kondo, RKKY and crystal field (CF) energy scales. The strongest effect is the continuous elevation of the Kondo temperature T(K) from approximately 3.5 K for CeNi(9)Ge(4) to about 70 K for CeNi(9)Si(4). This increase of the Kondo temperature is attended by a change of the CF level scheme of the Ce ions. The interplay of the different energy scales results in an incipient reduction of the ground state degeneracy from an effectively fourfold degenerate non-magnetic Kondo ground state with unusual non-Fermi-liquid features of CeNi(9)Ge(4) to a lower one, followed by an increase towards a sixfold, fully degenerate ground state multiplet in CeNi(9)Si(4) (T(K) ∼ Δ(CF)).
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Affiliation(s)
- C Gold
- CPM, Institut für Physik, Universität Augsburg, Augsburg, Germany
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Hu JCY, Seo BK, Neri QV, Rozenwaks Z, Palermo GD, Fields T, Neri QV, Monahan D, Rosenwaks Z, Palermo GD, Szkodziak P, Plewka K, Wozniak S, Czuczwar P, Mroczkowski A, Lorenzo Leon C, Hernandez J, Chinea Mendez E, Concepcion Lorenzo C, Sanabria Perez V, Puopolo M, Palumbo A, Toth B, Franz C, Montag M, Boing A, Strowitzki T, Nieuwland R, Griesinger G, Schultze-Mosgau A, Cordes T, Depenbusch M, Diedrich K, Vloeberghs V, Verheyen G, Camus M, Van de Velde H, Goossens A, Tournaye H, Coppola G, Di Caprio G, Wilding M, Ferraro P, Esposito G, Di Matteo L, Dale R, Coppola G, Dale B, Daoud S, Auger J, Wolf JP, Dulioust E, Lafuente R, Lopez G, Brassesco M, Hamad M, Montenarh M, Hammadeh M, Robles F, Magli MC, Crippa A, Pescatori E, Ferraretti AP, Gianaroli L, Zahiri M, Movahedin M, Mowla SJ, Noruzinia M, Crippa A, Ferraretti AP, Magli MC, Crivello AM, Robles F, Gianaroli L, Sermondade N, Dupont C, Hafhouf E, Cedrin-Durnerin I, Poncelet C, Benzacken B, Levy R, Sifer C, Ferfouri F, Boitrelle F, Clement P, Molina Gomes D, Bailly M, Selva J, Vialard F, Yaprak E, Basar M, Guzel E, Arda O, Irez T, Norambuena P, Krenkova P, Tuettelmann F, Kliesch S, Paulasova P, Stambergova A, Macek M, Macek M, Rivera R, Garrido-Gomez T, Galletero S, Meseguer M, Dominguez F, Garrido N, Mallidis C, Sanchez V, Weigeng L, Redmann K, Wistuba J, Gross P, Wuebbelling F, Fallnich C, Burger M, Kliesch S, Schlatt S, San Celestino Carchenilla M, Pacheco Castro A, Simon Sanjurjo P, Molinero Ballesteros A, Rubio Garcia S, Garcia Velasco JA, Macanovic B, Otasevic V, Korac A, Vucetic M, Garalejic E, Ivanovic Burmazovic I, Filipovic MR, Buzadzic B, Stancic A, Jankovic A, Velickovic K, Golic I, Markelic M, Korac B, Gosalvez J, Ruiz-Jorro M, Garcia-Ochoa C, Sachez-Martin P, Martinez-Moya M, Caballero P, Hasegawa N, Fukunaga N, Nagai R, Kitasaka H, Yoshimura T, Tamura F, Kato M, Nakayama K, Oono H, Kojima E, Yasue K, Watanabe H, Asano E, Hashiba Y, Asada Y, Das M, Al-Hathal N, San-Gabriel M, Phillips S, Kadoch IJ, Bissonnette F, Holzer H, Zini A, Zebitay AG, Irez T, Ocal P, Sahmay S, Karahuseyinoglu S, Usta T, Repping S, Silber S, Van Wely M, Datta A, Nayini K, Eapen A, Barlow S, Lockwood G, Tavares R, Baptista M, Publicover SJ, Ramalho-Santos J, Vaamonde D, Rodriguez I, Diaz A, Darr C, Chow V, Ma S, Smith R, Jeria F, Rivera J, Gabler F, Nicolai H, Cunha M, Viana P, Goncalves A, Silva J, Oliveira C, Teixeira da Silva J, Ferraz L, Madureira C, Doria S, Sousa M, Barros A, Herrero MB, Delbes G, Troueng E, Holzer H, Chan PTK, Vingris L, Setti AS, Braga DPAF, Figueira RCS, Iaconelli A, Borges E, Sargin Oruc A, Gulerman C, Zeyrek T, Yilmaz N, Tuzcuoglu D, Cicek N, Scarselli F, Terribile M, Franco G, Zavaglia D, Dente D, Zazzaro V, Riccio T, Minasi MG, Greco E, Cejudo-Roman A, Ravina CG, Candenas L, Gallardo-Castro M, Martin-Lozano D, Fernandez-Sanchez M, Pinto FM, Balasuriya A, Serhal P, Doshi A, Harper J, Romany L, Garrido N, Fernandez JL, Pellicer A, Meseguer M, Ribas-Maynou J, Garcia-Peiro A, Fernandez-Encinas A, Prada E, Jorda I, Cortes P, Llagostera M, Navarro J, Benet J, Kesici H, Cayli S, Erdemir F, Karaca Z, Aslan H, Karaca Z, Cayli S, Ocakli S, Kesici H, Erdemir F, Aslan H, Tas U, Ozdemir AA, Aktas RG, Tok OE, Ocakli S, Cayli S, Karaca Z, Erdemir F, Aslan H, Li S, Lu C, Hwu Y, Lee RK, Landaburu I, Gonzalvo MC, Clavero A, Ramirez JP, Pedrinaci S, Serrano M, Montero L, Carrillo S, Weiss J, Ortiz AP, Castilla JA, Sahin O, Bakircioglu E, Serdarogullari M, Bayram A, Yayla S, Ulug U, Tosun SB, Bahceci M, Aktas RG, Ozdemir AA, Tok OE, Yoon SY, Shin DH, Shin TE, Park EA, Won HJ, Kim YS, Lee WS, Yoon TK, Lee DR, Hattori H, Nakajo Y, Kyoya T, Kuchiki M, Kanto S, Kyono K, Park M, Park MR, Lim EJ, Lee WS, Yoon TK, Lee DR, Choi Y, Mitra A, Bhattacharya J, Kundu A, Mukhopadhaya D, Pal M, Enciso M, Alfarawati S, Wells D, Fernandez-Encinas A, Garcia-Peiro A, Ribas-Maynou J, Abad C, Amengual MJ, Navarro J, Benet J, Esmaeili V, Safiri M, Shahverdi AH, Alizadeh AR, Ebrahimi B, Brucculeri AM, Ruvolo G, Giovannelli L, Schillaci R, Cittadini E, Scaravelli G, Perino A, Cortes Gallego S, Gabriel Segovia A, Nunez Calonge R, Guijarro Ponce A, Ortega Lopez L, Caballero Peregrin P, Heindryckx B, Kashir J, Jones C, Mounce G, Ramadan WM, Lemmon B, De Sutter P, Parrington J, Turner K, Child T, McVeigh E, Coward K, Bakircioglu E, Ulug U, Tosun S, Serdarogullari M, Bayram A, Ciray N, Bahceci M, Saeidi S, Shapouri F, Hoseinifar H, Sabbaghian M, Pacey A, Aflatoonian R, Bosco L, Ruvolo G, Carrillo L, Pane A, Manno M, Roccheri MC, Cittadini E, Selles E, Garcia-Herrero S, Martinez JA, Munoz M, Meseguer M, Garrido N, Durmaz A, Dikmen N, Gunduz C, Tavmergen Goker E, Tavmergen E, Gozuacik D, Vatansever HS, Kara B, Calimlioglu N, Yasar P, Tavmergen E, Tavmergen Goker E, Semerci B, Baka M, Ozbilgin K, Karabulut A, Tekin A, Sabah B, Cottin V, Kottelat D, Fellmann M, Halm S, Rosenthaler E, Kisida T, Kojima F, Sakamoto T, Makutina VA, Balezin SL, Rosly OF, Slishkina TV, Hatzi E, Lazaros L, Xita N, Makrydimas G, Sofikitis N, Kaponis A, Stefos T, Zikopoulos K, Georgiou I, Zikopoulos K, Lazaros L, Xita N, Makrydimas G, Sofikitis N, Kaponis A, Stefos T, Hatzi E, Georgiou I, Georgiou I, Lazaros L, Xita N, Makrydimas G, Sofikitis N, Kaponis A, Stefos T, Hatzi E, Zikopoulos K, Hibi H, Ohori T, Sumitomo M, Asada Y, Anarte C, Calvo I, Domingo A, Presilla N, Aleman M, Bou R, Guardiola F, Agirregoikoa JA, De Pablo JL, Barrenetxea G, Zhylkova I, Feskov O, Feskova I, Zozulina O, Somova O, Nabi A, Khalili MA, Roudbari F, Parmegiani L, Cognigni GE, Bernardi S, Taraborrelli S, Troilo E, Ciampaglia W, Pocognoli P, Infante FE, Tabarelli de fatis C, Arnone A, Maccarini AM, Filicori M, Silva L, Oliveira JBA, Petersen CG, Mauri AL, Massaro FC, Cavagna M, Baruffi RLR, Franco JG, Fujii Y, Endou Y, Mtoyama H, Shokri S, Aitken RJ. ANDROLOGY. Hum Reprod 2012. [DOI: 10.1093/humrep/27.s2.73] [Citation(s) in RCA: 4] [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: 11/13/2022] Open
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Gross P, Kleinschmidt L, Beer S, Fallnich C. Beam position stabilization for a confocal multiphoton microscope. Appl Opt 2011; 50:5361-5368. [PMID: 22016202 DOI: 10.1364/ao.50.005361] [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] [Indexed: 05/31/2023]
Abstract
The influence of beam-pointing on scanning confocal microscopy is investigated. The beam displacement is measured using a quadrant photodiode, and the apparent movement of a sub-micron-sized particle observed by second-harmonic microscopy is linked to the beam displacement. A simple beam-pointing stabilization is implemented, and improvement of beam stability by three orders of magnitude on long time scales is achieved.
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Affiliation(s)
- P Gross
- Institute of Applied Physics, University of Münster, Münster, Germany. p.gross@uni‐muenster.de
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Affiliation(s)
- P Gross
- Medizinische Klinik III, Universitätsklinikum Carl Gustav Carus, Dresden.
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Mallidis C, Wistuba J, Bleisteiner B, Damm OS, Gross P, Wübbeling F, Fallnich C, Burger M, Schlatt S. In situ visualization of damaged DNA in human sperm by Raman microspectroscopy. Hum Reprod 2011; 26:1641-9. [PMID: 21531992 DOI: 10.1093/humrep/der122] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Beyond determining the percentage of damaged sperm, current methods of DNA assessment are of limited clinical utility as they render the sample unusable. We evaluated Raman microspectroscopy, a laser-based non-invasive technique that provides detailed chemical 'fingerprints' of cells and which potentially could be used for nuclear DNA-based sperm selection. METHODS Eight healthy donors provided ejaculates. After system optimization, a minimum of 200 air-dried sperm/sample/donor, prior to/and after UVB irradiation, were assessed by two observers. Spectra were analysed by Principal Component, Spectral Angle and Wavelet Analyses. RESULTS Spectra provided a chemical map delineating each sperm head region. Principal Component Analysis showed clear separation between spectra from UV-irradiated and untreated samples whilst averaged data identified two regions of interest (1040 and 1400 cm(-1)). Local spectral analysis around the DNA PO(4) backbone peak (1042 cm(-1)), showed that changes in this region were indicative of DNA damage. Wavelet decomposition confirmed both the 1042 cm(-1) shift and a second UVB susceptible region (1400-1600 cm(-1)) corresponding to protein-DNA interactions. No difference was found between observer measurements. CONCLUSIONS Raman microspectroscopy can provide accurate and reproducible assessment of sperm DNA structure and the sites and location of damage.
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Affiliation(s)
- C Mallidis
- Centre for Reproductive Medicine and Andrology, University of Münster, Domagkstrasse 11, 48149 Münster, Germany.
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Gross P, Lindsay ID, Lee CJ, Nittmann M, Bauer T, Bartschke J, Warring U, Fischer A, Kellerbauer A, Boller KJ. Frequency control of a 1163 nm singly resonant OPO based on MgO:PPLN. Opt Lett 2010; 35:820-822. [PMID: 20237610 DOI: 10.1364/ol.35.000820] [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] [Indexed: 05/28/2023]
Abstract
We report the realization of a singly resonant optical parametric oscillator (SRO) that is designed to provide narrow-bandwidth, continuously tunable radiation at a wavelength of 1163 nm for optical cooling of osmium ions. The SRO is based on periodically poled, magnesium-oxide-doped lithium niobate and pumped at 532 nm. The output coupling of the resonant idler wave is adjusted to yield up to 400 mW of 1163 nm radiation, with a bandwidth of a few megahertz. For continuous frequency tuning of the idler wave, the SRO is equipped with an intracavity etalon, and the cavity length is controlled with a piezo-actuated mirror synchronized to the etalon angle.
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Affiliation(s)
- P Gross
- LPNO Group, MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands.
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Abstract
BACKGROUND Increasing data support the hypothesis of a local and systemic crosstalk between adipocytes and monocytes mediated by fatty acids. The aim of this study was to characterize the immunomodulatory effects of a large panel of fatty acids on cytokines and chemokines in monocytic THP-1 cells and primary human monocytes. We tested whether anti-inflammatory fatty acids are able to inhibit the binding of lipopolysaccharide (LPS) to its receptor, toll-like receptor/MD-2 (TLR4/MD-2). MATERIALS AND METHODS Resistin, monocyte chemoattractant protein-1 (MCP-1) and tumour necrosis factor (TNF) were measured by enzyme-linked immunosorbent assay. Proteins were analysed by Western blot. A designed Flag-tagged TLR4/MD-2 fusion protein (LPS trap) was used to investigate the effect of fatty acids on binding of LPS to its receptor. In 30 patients with type 2 diabetes mellitus (T2D), the correlation of serum triglyceride levels with LPS-induced monocyte activation was analysed. RESULTS Eleven fatty acids investigated exerted differential effects on the monocytic release of cytokines and chemokines. Eicosapentaenoic acid had potent anti-inflammatory effects on human primary monocytes and THP-1 cells; 100 and 200 microM eicosapentaenoic acid dose-dependently inhibited LPS binding to the LPS trap. LPS-induced release of monocytic MCP-1 and TNF was significantly and positively correlated with serum triglyceride levels in 30 patients with T2D. CONCLUSIONS Monocytic activation is differentially regulated by fatty acids and depends on triglyceride levels in T2D. The main finding of the present study shows that eicosapentaenoic acid inhibits the specific binding of LPS to TLR4/MD-2. Eicosapentaenoic acid represents a new anti-inflammatory LPS-antagonist.
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Affiliation(s)
- A Kopp
- Regensburg University Hospital, Regensburg, Germany
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Scheidler J, Vogel M, Gross P, Heuck A. Combined MRI and MRS in prostate cancer: improvement of spectral quality by susceptibility matching. ROFO-FORTSCHR RONTG 2009; 181:531-5. [PMID: 19353482 DOI: 10.1055/s-0028-1109182] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
PURPOSE Local magnetic field inhomogeneity caused by susceptibility artifacts due to air in the endorectal coil substantially degrades the quality of 3D MR spectroscopic imaging (3D-MRSI). Perflubron (PFB) has magnetic susceptibility similar to that of human tissue. We prospectively assessed the effect of susceptibility matching using PFB on in vivo prostate (1)H-3D-MRSI. MATERIALS AND METHODS Ninety-one consecutive patients referred for 3D-MRSI were examined using air and PFB as the filling agent for endorectal coils at 1.5T with an identically placed PRESS box and sat bands. Solely auto-shim without additional manual shimming was used. The full width at half maximum (FWHM) of the water peak was statistically compared with a paired t-test. The spectral quality was visually evaluated for the definition of metabolite peaks and for the citrate peak split (duplet). The MR image quality was rated on a five-point scale. RESULTS FWHM was significantly less (p < 0.001) using PFB (mean 9.0 +/- 3.3, range 3 - 20) than air (mean 14.9 +/- 4.2, range 6 - 26) in 85/91 patients (93%). The spectral quality markedly improved using PFB and frequently the duplet of the citrate peak was able to be identified. Image quality ratings were similar (mean rating PFB 4.2, air 4.3 points). Omitting manual shimming led to a time savings of 4 min. per study. CONCLUSION 3D-MRSI using PFB for susceptibility matching benefits from significantly better local field homogeneity, thus providing improved spectra quality. Combined with a substantial time savings in data acquisition, this may increase the clinical utilization of 3D-MRSI in patients with prostate cancer.
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Affiliation(s)
- J Scheidler
- Radiologie, Radiologisches Zentrum München-Pasing.
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Gross P, Scheel L, Stokinger H. Ozone Toxicity Studies; Destruction of Alveolar Septa – a Precursor of Emphysema? Respiration 2009. [DOI: 10.1159/000192426] [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: 11/19/2022] Open
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Burnett K, Williams H, Macey B, Mancia A, Gross P, Warr G, Chapman R, Burnett L. Resilience and sensitivity to environmental stress in the American oyster, Crassostrea virginica. Comp Biochem Physiol A Mol Integr Physiol 2008. [DOI: 10.1016/j.cbpa.2008.04.408] [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: 11/24/2022]
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Postma S, van Rhijn ACW, Korterik JP, Gross P, Herek JL, Offerhaus HL. Application of spectral phase shaping to high resolution CARS spectroscopy. Opt Express 2008; 16:7985-7996. [PMID: 18545508 DOI: 10.1364/oe.16.007985] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
By spectral phase shaping of both the pump and probe pulses in coherent anti-Stokes Raman scattering (CARS) spectroscopy we demonstrate the extraction of the frequencies, bandwidths and relative cross sections of vibrational lines. We employ a tunable broadband Ti:Sapphire laser synchronized to a ps-Nd:YVO mode locked laser. A high resolution spectral phase shaper allows for spectroscopy with a precision better than 1 cm(-1) in the high frequency region around 3000 cm(-1). We also demonstrate how new spectral phase shaping strategies can amplify the resonant features of isolated vibrations to such an extent that spectroscopy and microscopy can be done at high resolution, on the integrated spectral response without the need for a spectrograph.
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Affiliation(s)
- S Postma
- Optical Sciences Group, Department of Science and Technology, MESA Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands.
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Nieuwenhuis AF, Lee CJ, van der Slot PJM, Lindsay ID, Gross P, Boller KJ. High-efficiency mid-infrared ZnGeP2 optical parametric oscillator directly pumped by a lamp-pumped, Q-switched CrTmHo:YAG laser. Opt Lett 2008; 33:52-54. [PMID: 18157255 DOI: 10.1364/ol.33.000052] [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] [Indexed: 05/25/2023]
Abstract
We report a singly resonant optical parametric oscillator (SRO) based on a ZnGeP(2) crystal directly pumped by a lamp-pumped Q-switched CrTmHo:YAG laser. The IR was tunable from 4.7 to 7.8 microm via crystal angle tuning. A maximum optical to optical efficiency of 56% was obtained from the pump (2.09 microm) to total IR at a pump energy of 6.5 mJ. The corresponding idler energy was 1.45 mJ. The SRO was measured to have a slope efficiency of 64% and a threshold of 1 mJ. The spatial beam quality of the idler, characterized by the M(2) parameter, was 1.38 when the SRO was pumped at 2.5 times threshold. These results show that ZnGeP(2) optical parametric oscillators directly pumped by a CrTmHo:YAG laser can be operated efficiently, while maintaining good IR beam quality.
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Affiliation(s)
- A F Nieuwenhuis
- Laser Physics and Nonlinear Optics Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
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Scheidler J, Gross P, Vogel M, Heuck AF. MR-spektroskopische Bildgebung (MRSI) beim Prostatakarzinom: Beschleunigung und Verbesserung durch Suszeptibilitätsangleichung mit Perflubron (PFB). ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1073712] [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: 10/21/2022]
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Gross P. Muss die asymptomatische Hyponatriämie behandelt werden? Dtsch Med Wochenschr 2007; 132:1848. [PMID: 17726659 DOI: 10.1055/s-2007-984977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- P Gross
- Medizinische Klinik III, Universitätsklinikum Carl Gustav Carus, Dresden, Germany.
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Reheman A, Yang H, Bai X, Spring C, Wagner D, Fassler R, Gross P, Freedman J, Ni H. ROLE OF PLASMA FIBRONECTIN IN FIBRINOGEN/VWF-INDEPENDENT THROMBUS FORMATION. J Thromb Haemost 2007. [DOI: 10.1111/j.1538-7836.2007.tb01726.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Gross P, Störzer M, Fiebig S, Clausen M, Maret G, Aegerter CM. A precise method to determine the angular distribution of backscattered light to high angles. Rev Sci Instrum 2007; 78:033105. [PMID: 17411176 DOI: 10.1063/1.2712943] [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] [Indexed: 05/14/2023]
Abstract
We present an approach to measure the angular dependence of the diffusely scattered intensity of a multiple scattering sample in backscattering geometry. Increasing scattering strength give rise to an increased width of the coherent backscattering and sets higher demands on the angular detection range. This is of particular interest in the search for the transition to Anderson localization of light. To cover a range of -60 degrees to +85 degrees from direct back-reflection, we introduced a new parallel intensity recording technique. This allows one-shot measurements, with fast alignment and short measuring time, which prevents the influence of illumination variations. Configurational average is achieved by rotating the sample and singly scattered light is suppressed with the use of circularly polarized light up to 97%. This implies that backscattering enhancements of almost two can be achieved. In combination with a standard setup for measuring small angles up to +/-3 degrees , a full characterization of the coherent backscattering cone can be achieved. With this setup we are able to accurately determine transport mean free paths as low as 235 nm.
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Affiliation(s)
- P Gross
- Fachbereich Physik, University of Konstanz, Box M621, 78457 Konstanz, Germany
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Herbrig K, Gebler K, Oelschlaegel U, Pistrosch F, Foerster S, Wagner A, Gross P, Passauer J. Kidney transplantation substantially improves endothelial progenitor cell dysfunction in patients with end-stage renal disease. Am J Transplant 2006; 6:2922-8. [PMID: 17061996 DOI: 10.1111/j.1600-6143.2006.01555.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [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: 01/25/2023]
Abstract
Endothelial progenitor cells (EPC) are involved in endothelial repair and maintenance. Dysfunction of EPC may contribute to accelerated arteriosclerosis in chronic kidney disease. Kidney transplantation (KTx) improves both survival and endothelial function of dialysis patients. In a prospective study, we tested to which extent KTx changes EPC biology. We studied number and function (migratory activity, adhesion to extracellular matrix proteins and to mature endothelial cells [EC]) of EPC in 20 patients during dialysis and 3, 6, 9 and 12 months after KTx. Twenty-two healthy volunteers served as matched controls. Circulating precursor populations were measured by flow cytometric analysis. Cytokines relevant for EPC mobilization were monitored. Compared to the dialysis state, KTx increased the migration of EPC to approximately 2-fold. Adhesion to fibronectin and to collagen type IV was significantly increased after KTx. An improved adhesion rate of EPC to mature EC was observed. The number of EPC decreased. The amount of precursor populations showed no difference compared to the pretransplant state. Our study shows an improved function of EPC after KTx. This finding indicates an improved potential for endothelial repair which in turn may contribute to enhanced endothelial function and reduced cardiovascular morbidity after KTx.
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Affiliation(s)
- K Herbrig
- Nephrology, Department of Internal Medicine III, Technical University of Dresden, Dresden, Germany.
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Le Petit G, Jutier C, Gross P, Greiner V. Low-level activity measurement of 131Xem, 133Xem, 135Xe and 133Xe in atmospheric air samples using high-resolution dual X–γ spectrometry. Appl Radiat Isot 2006; 64:1307-12. [PMID: 16603369 DOI: 10.1016/j.apradiso.2006.02.094] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [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: 11/29/2022]
Abstract
High-resolution dual X and gamma spectrometry has been optimized to improve the sensitivity in analyzing radioxenon from environmental samples, especially for the metastable isotopes (131Xem and 133Xem). The full-energy peak (FEP) efficiency curve in the 20-700 keV range has been established with a global uncertainty better than +/-3% using a Monte Carlo simulation. The minimum detectable activity concentrations (MDC) achievable at the laboratory for 131Xem, 133Xem, 133Xe and 135Xe are presented and the influence of 133Xe activity on the metastable radioxenon MDCs is evaluated.
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Affiliation(s)
- G Le Petit
- Commissariat à l'Energie Atomique (CEA), DIF/DASE/SRCE, BP 12, 91680 Bruyères-le-Châtel, France.
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Verbalis JG, Ghali JK, Gross P, Long WA, Smith N. Efficacy and safety of the vasopressin antagonist conivaptan in patients with euvolemic hyponatremia evaluated in a phase III clinical trial. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.8550] [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] [Indexed: 11/20/2022] Open
Abstract
8550 Background: Hyponatremia, often caused by the inappropriate secretion of arginine vasopressin (AVP), is a common electrolyte disorder in patients with small-cell lung cancer (15%), head and neck cancer (3%), and non-small-cell lung cancer (0.7%). Conivaptan (CNV), a novel V1A and V2 AVP antagonist, produces aquaresis–the electrolyte-sparing excretion of water. CNV was recently approved for the treatment of euvolemic hyponatremia in hospitalized patients. The efficacy of CNV 40 mg/d was compared with that of placebo (PBO) on days 2 and 4 of a 4-day study in patients with euvolemic hyponatremia. Methods: This randomized, double-blind, multicenter, PBO-controlled trial enrolled 84 patients with euvolemic or hypervolemic hyponatremia (serum [Na+] 115 to <130 mEq/L). Patients were assigned to a PBO or a CNV 20-mg IV loading dose, followed by a continuous infusion of PBO or CNV 40 or 80 mg/d for 4 days. The primary efficacy measure was the change in serum [Na+] from baseline during treatment, as measured by the area under the serum [Na+]-time curve (AUC). Secondary efficacy measures included the change from baseline in serum [Na+]; time from first dose to achieve a confirmed ≥4 mEq/L increase in serum [Na+]; and the number of patients achieving a confirmed ≥6 mEq/L increase in serum [Na+] or normal serum [Na+] (≥135 mEq/L). Of the 84 patients enrolled, 56 (66.7%) had euvolemic hyponatremia; presented here are the results from 21 given PBO and 18 given CNV 40 mg/d. Results: The baseline serum [Na+] was similar in both treatment groups (PBO: 124.3 mEq/L, CNV 40 mg/d: 123.6 mEq/L). CNV 40 mg/d improved serum [Na+] and all secondary efficacy measures significantly more than PBO (Table). CNV was well tolerated; the most common adverse events associated with CNV at the end of the 4-day treatment were infusion-site reactions, postural hypotension, and thirst. Conclusion: CNV 40 mg/d increased serum [Na+] significantly more than PBO on days 2 and 4 in patients with euvolemic hyponatremia. [Table: see text] [Table: see text]
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Affiliation(s)
- J. G. Verbalis
- Georgetown University, Washington, DC; Louisiana State University, Shreveport, LA; Universitätsklinikum Carl Gustav Carus, Dresden, Germany; Cato Research, Durham, NC; Astellas Pharma US, Inc., Deerfield, IL
| | - J. K. Ghali
- Georgetown University, Washington, DC; Louisiana State University, Shreveport, LA; Universitätsklinikum Carl Gustav Carus, Dresden, Germany; Cato Research, Durham, NC; Astellas Pharma US, Inc., Deerfield, IL
| | - P. Gross
- Georgetown University, Washington, DC; Louisiana State University, Shreveport, LA; Universitätsklinikum Carl Gustav Carus, Dresden, Germany; Cato Research, Durham, NC; Astellas Pharma US, Inc., Deerfield, IL
| | - W. A. Long
- Georgetown University, Washington, DC; Louisiana State University, Shreveport, LA; Universitätsklinikum Carl Gustav Carus, Dresden, Germany; Cato Research, Durham, NC; Astellas Pharma US, Inc., Deerfield, IL
| | - N. Smith
- Georgetown University, Washington, DC; Louisiana State University, Shreveport, LA; Universitätsklinikum Carl Gustav Carus, Dresden, Germany; Cato Research, Durham, NC; Astellas Pharma US, Inc., Deerfield, IL
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40
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Christensen D, Feldman C, Rossi P, Marrie T, Blasi F, Luna C, Fernandez P, Porras J, Martinez J, Weiss K, Levy G, Lode H, Gross P, File T, Ramirez J. HIV infection does not influence clinical outcomes in hospitalized patients with bacterial community-acquired pneumonia: results from the CAPO international cohort study. Clin Infect Dis 2005; 41:554-6. [PMID: 16028168 DOI: 10.1086/432063] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2005] [Accepted: 04/11/2005] [Indexed: 11/03/2022] Open
Abstract
In a case-control study, outcomes for 58 human immunodeficiency virus (HIV)-positive patients with community-acquired pneumonia (CAP) were compared with outcomes for 174 HIV-negative patients with CAP. No differences were found in the time to clinical stability, the length of hospitalization, and mortality. Clinical outcomes for hospitalized patients with CAP may not be influenced by HIV infection.
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41
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Reheman A, Gross P, Yang H, Chen P, Allen D, Leytin V, Freedman J, Ni H. Vitronectin stabilizes thrombi and vessel occlusion but plays a dual role in platelet aggregation. J Thromb Haemost 2005; 3:875-83. [PMID: 15733060 DOI: 10.1111/j.1538-7836.2005.01217.x] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.0] [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: 11/29/2022]
Abstract
The role of vitronectin (Vn) in thrombosis is currently controversial; both inhibitory and supportive roles have been reported. To monitor directly the function of Vn in thrombotic events at the site of vascular injury, we studied Vn-deficient (Vn-/-) and wild-type (WT) control mice with two real-time intravital microscopy thrombosis models. In the mesenteric arteriole model, vessel injury was induced by ferric chloride. We observed unstable thrombi and a significantly greater number of emboli in Vn-/- mice. Vessel occlusion was also delayed and frequent vessel re-opening occurred. In the cremaster muscle arteriole model, vessel injury was induced by a nitrogen dye laser. We observed significantly fewer platelets, lower fibrin content, and unstable fibrin within the thrombi of Vn-/- mice. To define further the role of Vn in thrombus growth, we studied platelet aggregation in vitro. Consistent with our in vivo data, the second wave of thrombin-induced aggregation of gel-filtered platelets was abolished at a low concentration of thrombin in Vn-/- platelets. Interestingly, adenosine diphosphate (ADP)-induced platelet aggregation was significantly increased in Vn-/- platelet-rich plasma (PRP) and this effect was attenuated by adding purified plasma Vn. We also observed increased platelet aggregation induced by shear stress in Vn-/- whole blood. These data demonstrate that Vn is a thrombus stabilizer. However, in contrast to released platelet granule Vn which enhances platelet aggregation, plasma Vn inhibits platelet aggregation.
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Affiliation(s)
- A Reheman
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
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42
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Gross P, Herbrig K. Role of endothelial progenitor cells in cardiovascular pathology. Rocz Akad Med Bialymst 2004; 49:174-7. [PMID: 15631337] [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] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
Replacement of injured endothelial cells by bone marrow derived endothelial progenitor cells (EPC's) is a new pathway of vascular repair after ischemia. Endothelial progenitor cells contribute less than 0.01% to the peripheral venous compartment of mononuclear cells. The detection of EPC's requires a demonstration of CD 34 and VEGFR-2 (vascular endothelial growth factor receptor-2) antigenic cell membrane determinants and proof of endothelial characteristics after outgrowth and differentiation in cell culture. The most important stimuli to the mobilization and proliferation of EPC's are VEGF, GM-CSF (granulocyte-macrophage colony stimulating factor), erythropoietin, HMG-CoA-reductase inhibitors and tissue ischemia. In vivo in patients EPC's appear to contribute to endothelialization of vascular grafts, the formation of collaterals of ischemic limbs and the healing of myocardial infarcts. The role of EPC's in uremia is currently under investigation.
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Affiliation(s)
- P Gross
- Department of Nephrology, University Medical Center, TU Dresden, Germany.
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43
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Klein ME, Adel P, Auerbach M, Fallnich C, Gross P, Boller KJ. Microsecond pulsed optical parametric oscillator pumped by a Q-switched fiber laser. Opt Lett 2003; 28:2222-2224. [PMID: 14649948 DOI: 10.1364/ol.28.002222] [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] [Indexed: 05/24/2023]
Abstract
We report on what is to our knowledge the first optical parametric oscillator (OPO) pumped by microsecond pulses from a wavelength-tunable solid-state laser. The singly resonant OPO (SRO) is based on a periodically poled LiNbO3 crystal and pumped with 2.1-micros-long pulses from an actively Q-switched Yb fiber laser. At an average fiber laser power of 3.6 W, the SRO generates 1.9-micros-long pulses with a repetition rate of 25 kHz and an average power of 560 mW at 3360 nm. The SRO was tuned from 1518 to 1634 nm (signal) and from 3145 to 3689 nm (idler) via the crystal temperature and poling period. By all-electronic tuning of the fiber laser wavelength over 19 nm, tuning of the mid-infrared idler wavelength over 195 nm was achieved.
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Affiliation(s)
- M E Klein
- Nederlands Centrum voor Laser Research b.v., PO Box 2662, 7500 CR Enschede, The Netherlands.
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Enderlein M, Gross P. Additive effects of oxidized low-density lipoproteins and cyclosporine on endothelin-1 production of renal arterial endothelial cells. Transplant Proc 2003; 35:1581-3. [PMID: 12826225 DOI: 10.1016/s0041-1345(03)00451-2] [Citation(s) in RCA: 2] [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] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M Enderlein
- 3rd Department of Medicine, Medical Faculty Carl Gustav Carus, Technical University, Dresden, Germany
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45
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Klein ME, Gross P, Boller KJ, Auerbach M, Wessels P, Fallnich C. Rapidly tunable continuous-wave optical parametric oscillator pumped by a fiber laser. Opt Lett 2003; 28:920-922. [PMID: 12816246 DOI: 10.1364/ol.28.000920] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We report on rapid, all-electronically controlled wavelength tuning of a continuous-wave (cw) optical parametric oscillator (OPO) pumped by an ytterbium fiber laser. The OPO is singly resonant for the signal wave and consists of a 40-mm-long periodically poled lithium niobate crystal in a four-mirror ring cavity. By tuning of the fiber-laser wavelength over 33 nm through an intracavity acousto-optic tunable filter, the OPO idler wavelength is tuned from 3160 to 3500 nm in 330 micros, corresponding to an idler frequency-tuning speed of 28 THz/ms. At a fiber-laser power of 6.6 W at 1074 nm, the singly resonant OPO generates 1.13-W cw idler radiation at 3200 nm.
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Affiliation(s)
- M E Klein
- Nederlands Centrum voor Laser Research, b.v., P.O. Box 2662, 7500 CR Enschede, The Netherlands.
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Celi A, Merrill-Skoloff G, Gross P, Falati S, Sim DS, Flaumenhaft R, Furie BC, Furie B. Thrombus formation: direct real-time observation and digital analysis of thrombus assembly in a living mouse by confocal and widefield intravital microscopy. J Thromb Haemost 2003; 1:60-8. [PMID: 12871540 DOI: 10.1046/j.1538-7836.2003.t01-1-00033.x] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.6] [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: 11/20/2022]
Abstract
We have developed novel instrumentation using confocal and widefield microscopy to image and analyze thrombus formation in real time in the microcirculation of a living mouse. This system provides high-speed, near-simultaneous acquisition of images of multiple fluorescent probes and a brightfield channel, and supports laser-induced injury through the microscope optics. Although this imaging facility requires interface of multiple hardware components, the primary challenge in vascular imaging is careful experimental design and interpretation. This system has been used to localize tissue factor during thrombus formation, to observe defects in thrombus assembly in genetically altered mice, to study the kinetics of platelet activation and P-selectin expression following vascular injury, to analyze leukocyte rolling on arterial thrombi, to generate three-dimensional models of thrombi, and to analyze the effect of antithrombotic agents in vivo.
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Affiliation(s)
- A Celi
- Center for Hemostasis and Thrombosis Research, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
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47
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Gross P, Klein ME, Ridderbusch H, Lee DH, Meyn JP, Wallenstein R, Boller KJ. Wide wavelength tuning of an optical parametric oscillator through electro-optic shaping of the gain spectrum. Opt Lett 2002; 27:1433-1435. [PMID: 18026470 DOI: 10.1364/ol.27.001433] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We present a novel technique for tuning an optical parametric oscillator (OPO) through electro-optically induced shape variations of the parametric gain spectrum in quasi-phase-matched lithium niobate (LN). The diode-pumped, triply resonant continuous-wave OPO is based on a 58-mm-long LN crystal that consists of three equally long sections, the outer sections being periodically poled with a 50% duty cycle. The center section is single-domain material and serves as a tunable phase shifter through the electro-optic effect. By application of a voltage of up to 1230 V, the OPO signal and idler wavelengths are tuned over 102 nm from 1560 to 1660 nm, in good agreement with theory.
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48
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Chippaux JP, Houssier S, Gross P, Bouvier C, Brissaud F. [Pollution of the groundwater in the city of Niamey, Niger]. Bull Soc Pathol Exot 2002; 95:119-23. [PMID: 12145956] [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] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
We conducted a study on chemical and bacteriological groundwater pollution in Niamey, a Sahelian city of some 700,000 inhabitants. A total of 22 wells and 24 bore-holes were selected on a geological and socio-economic basis. The superficial aquifers, located on each bank of the River Niger and connected to the wells, presented high levels of oxidizable nitrogen and bacteriological pollution (coliform and faecal Streptococcus) which make the water unfit for human consumption. The deep aquifer, which supplies pumps, was also polluted but to a lesser degree. Faecal pollution increased after the rainy season. The lack of sanitation in Niamey and the seepage of polluted matters from the superficial layers could explain this pollution. Eventually, the use of the groundwater could increase and constitute a major health risk for the majority of the inhabitants of Niamey.
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Affiliation(s)
- J P Chippaux
- Centre de recherche sur les méningites et les schistosomoses, CERMES, Institut de recherche pour le développement (IRD, anciennement ORSTOM), Niamey, Niger.
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Abstract
The authors refer a case report of the Peutz-Jeghers tumour localised in transverse colon found during a systematic clinical examination of the 4-day-old newborn, without any signs of intestinal occlusion. The end-to-end colic resection was made. Post-operative course was without any complications. The observation is rarely due to the tumour's atypical localisation as well as its presence in the newborn.
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Affiliation(s)
- A Al Faour
- Service de Chirurgie Pédiatrique, Hôpital Delafontaine, Saint-Denis, France.
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50
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Gross P, Klein ME, Walde T, Boller KJ, Auerbach M, Wessels P, Fallnich C. Fiber-laser-pumped continuous-wave singly resonant optical parametric oscillator. Opt Lett 2002; 27:418-420. [PMID: 18007820 DOI: 10.1364/ol.27.000418] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We report on what is to our knowledge the first continuous-wave (cw) optical parametric oscillator (OPO) that is pumped by a tunable fiber laser. The OPO is singly resonant for the signal wave and consists of a 40-mm-long periodically poled LiNbO(3) crystal in a four-mirror ring cavity. At a pump power of 8.3 W provided by the wavelength-tunable Yb-doped fiber laser, the singly resonant OPO generates 1.9 W of 3200-nm cw idler radiation. The singly resonant OPO was tuned from 1515 to 1633 nm (signal) and from 3057 to 3574 nm (idler) by means of the crystal temperature and poling period. We obtained a wide idler tuning range, from 2980 to 3700 mn, by tuning the wavelength of the fiber laser from 1032 to 1095 nm.
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