Web of Science, 2003-02-28, „deconvolution + kinetic*” (453 found)

Mougin P, Thomas A, Wilkinson D, et al. On-line monitoring of a crystallization processAICHE J 49 (2): 373-378 FEB 2003

On-Line Monitoring of a Crystallization Process Patricia Mougina, Alistair Thomasa, Derek Wilkinsona, Graeme Whitea, Kevin J. Robertsb, Norbert Herrmannc, Robert Jackc and Richard Tweediec

a Center for Molecular and Interface Engineering, Dept. of Mechanical and Chemical Engineering, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, U.K. b Institute for Particle Science and Engineering, Dept. of Chemical Engineering, University of Leeds, Leeds LS2 9JT, U.K. c Malvern Instruments Ltd., Enigma Business Park, Malvern, Worcestershire, WR14 1XZ, U.K.

Received 28 January 2002; revised 12 September 2002. Available online 7 February 2003. AbstractThe application of ultrasonic spectroscopy for particle-size measurements was investigated during the batch crystallization of (L)-glutamic acid -polymorph from an aqueous solution. The technique, based on measurements of the attenuation of ultrasonic waves through the suspension, was applied using a prototype ultrasonic spectrometer with a flow-through cell. High-precision measurements of ultrasonic attenuation in the frequency range 7–110 MHz were performed, the deconvolution of which enabled in-process measurement of crystal size distribution and solid concentration throughout the crystallization process. In addition to evincing secondary nucleation, growth and crystal breakage on-line in real time, the experimental results were used to obtain kinetic parameters essential for process design, including secondary nucleation rate and growth rate.

McIntyre NS, Davidson RD, Kim G, et al. New frontiers in X-ray photoelectron spectroscopyVACUUM 69 (1-3): 63-71 DEC 24 2002 http://keszei.chem.elte.hu/DSP/X-rayVacuum69.pdf

DOI: 10.1016/S0042-207X(02)00308-1 PII: S0042-207X(02)00308-1   Copyright © 2002 Elsevier Science Ltd. All rights reserved. New frontiers in X-ray photoelectron spectroscopy N. S. McIntyre , , R. D. Davidson, G. Kim and J. T. Francis Surface Science Western, Room G-1, Western Science Centre, University of Western Ontario, London, Ont., Canada N6A 5B7 Available online 17 October 2002. AbstractX-ray photoelectron spectroscopy (XPS) has seen widespread use in applied and basic surface science studies since 1970. Its capabilities appear to be undergoing a series of improvements, due both to technological changes and to the culmination of efforts by the XPS community to solve a series of scientific questions that underlie the technique. This paper describes some of the advances made in the past 5 yr and uses two particular studies to illustrate the improvements: the use of mathematical deconvolution to study the initial and extended oxidation of nickel metal, and the use of XPS imaging to identify electrochemical processes during the pitting corrosion of a nickel-based alloy. Finally, the use of modern synchrotrons in further improving the spectroscopic capabilities of XPS will be described.

Author Keywords: XPS; Photoelectron spectroscopy; Oxidation; Surface analysis

Weinmann P, Faraggi M, Moretti JL, et al. Clinical validation of simultaneous dual-isotope myocardial scintigraphyEUR J NUCL MED MOL I 30 (1): 25-31 JAN 2003

Endicott JF, Uddin J, Schlegel HB Some spectroscopic aspects of electron transfer in ruthenium(II) polypyridyl complexesRES CHEM INTERMEDIAT 28 (7-9): 761-777 2002

Wadhawan JD, Welford PJ, McPeak HB, et al. The simultaneous voltammetric determination and detection of oxygen and carbon dioxide - A study of the kinetics of the reaction between superoxide and carbon dioxide in non-aqueous media using membrane-free gold disc microelectrodesSENSOR ACTUAT B-CHEM 88 (1): 40-52 JAN 1 2003 http://keszei.chem.elte.hu/DSP/SensActB88.pdf

Vincent L, Sbirrazzuoli N, Vyazovkin S Evaluation of the dynamic response of a new heat flux calorimeter for kinetic purposesIND ENG CHEM RES 41 (26): 6650-6655 DEC 25 2002

Doc. type: Article    Language: English    Cited References: 11    Times Cited: 0    Abstract:A new reaction calorimeter has been developed for measuring the kinetics of reactions accompanied by small thermal effects. For kinetic purposes, the calorimeter was calibrated by simulating the heat flow in accord with a certain kinetic equation. This was accomplished by applying a software-controlled voltage to a resistor placed inside the calorimeter, The obtained isothermal data were deconvoluted and treated using two different kinetic methods to explore the effect of deconvolution on the values of the kinetic parameters. KeyWords Plus:CONDENSED-PHASE REACTIONS Addresses:Vincent L, Univ Nice, Equipe Thermocinet, Parc Valrose, F-06108 Nice 2, FranceUniv Alabama, Dept Chem, Birmingham, AL 35294 USAUniv Nice, Equipe Thermocinet, F-06108 Nice 2, France Publisher:AMER CHEMICAL SOC, WASHINGTON IDS Number: 628LC ISSN: 0888-5885

**Veldhuis JD, Bidlingmaier M, Anderson SM, et al. Impact of experimental blockade of peripheral growth hormone (GH) receptors on the kinetics of endogenous and exogenous GH removal in healthy women and menJ CLIN ENDOCR METAB 87 (12): 5737-5745 DEC 2002

Impact of experimental blockade of peripheral growth hormone (GH) receptors on the kinetics of endogenous and exogenous GH removal in healthy women and menVeldhuis JD, Bidlingmaier M, Anderson SM, Evans WS, Wu Z, Strasburger CJJOURNAL OF CLINICAL ENDOCRINOLOGY AND METABOLISM 87 (12): 5737-5745 DEC 2002Document type: Article    Language: English    Cited References: 43    Times Cited: 0    Abstract:Organs that respond to and metabolize GH are enriched in cognate high-affinity receptors. However, whether isologous receptors mediate the de facto access of ligand to cellular degradative pathways is not known. To address this query, we assessed the distribution and whole-body elimination kinetics of (endogenous and exogenous) GH before and after administration of a novel, potent, and selective recombinant human (rh) GH receptor antagonist peptide, pegvisomant. Sixteen healthy young adults (nine men and seven women) participated in

a double-blind, prospectively randomized, within-subject cross-over study. The intervention comprised a single sc injection of placebo vs. a high dose of pegvisomant (1 mg/kg sc) timed 62 and 74 h before the overnight sampling and daytime infusion sessions, respectively. The half-life, metabolic clearance rate (MCR), and distribution volume of GH were quantitated by way of: 1) deconvolution analysis of serum GH concentration time series collected every 10 min for 10 h; 2) exponential regression analysis of the decay of GH concentrations after a 6-min iv pulse of rhGH (1 and 10 mug/kg); 3) calculation of the MCR during constant iv infusion of rhGH (0.5 and 5.0 mug/kg every 2 h); and 4) exponential fitting of the elimination time-course of GH concentrations following cessation of each constant infusion. Concentrations of GH and pegvisomant were measured in separate, noncross-reactive, two-site monoclonal, immunofluorometric assays. Pegvisomant concentrations averaged 4860 +/- 480 mug/liter (+/-SEM) across the infusion interval, thus exceeding low steady state GH concentrations by 3000-fold. Inhibitory efficacy of the GH receptor antagonist peptide was affirmed by way of a 34% reduction in the serum total IGF-I concentration, i.e., from 257 +/- 37 (placebo) to 170 +/- 24 (drug) mug/liter (P < 0.001); and a reciprocal 77% elevation of the (10-h) mean GH concentration, i.e., from 1.3 +/- 0.23 (placebo) to 2.3 +/- 0.42 (drug) mug/liter (P = 0.003). ANOVA disclosed that prior administration of pegvisomant (compared with placebo) did not alter: 1) the calculated half-life (minutes) of secreted GH, which averaged 15 +/- 1.3 (placebo) and 14 +/- 0.69 (drug); 2) the half-time of disappearance (minutes) of an iv pulse of rhGH, 15 +/- 1.0 (placebo) and 13 +/- 0.5 (drug) (for the 10 mug/kg dose); 3) the distribution volume (milliliters per kilogram) of rhGH, 59 +/- 6.2 (placebo) and 58 +/- 3.5 (drug); 4) the steady state GH concentration (micrograms per liter) attained during constant iv infusion of rhGH (at a rate of 5 mug/kg every 2 h), 18.2 +/- 2.4 (placebo) and 18.3 +/- 2.3 (drug); 5) the half-life (minutes) of elimination of GH from equilibrium, 16 +/- 0.98 (placebo) and 16 +/- 1.8 (drug); and 6) the steady state MCR (liters per kilogram per day) of rhGH, 3.8 +/- 0.32 (placebo) and 3.5 +/- 0.31 (drug). In ensemble, the present data refute the a priori postulate that vascular-accessible GH receptors determine the in vivo pseudoequilibrium kinetics of GH disappearance in the human. KeyWords Plus:BINDING-PROTEIN, METABOLIC-CLEARANCE, ANTAGONIST PEGVISOMANT, EXTRACELLULAR DOMAIN, LUTEINIZING-HORMONE, RATIONAL DESIGN, PLASMA-INSULIN, RENAL-FAILURE, RAT-LIVER, PROFILES Addresses:Veldhuis JD, Mayo Clin, Mayo Clin & Mayo Grad Sch Med, Dept Internal Med, Div Endocrinol, 200 1st St SW, Rochester, MN 55905 USAUniv Munich, Klinikum Innenstadt, Med Klin, D-80336 Munich, GermanyUniv Virginia, Sch Med, Ctr Biochem Technol, Gen Clin Res Ctr,Div Endocrinol,Dept Internal Med, Charlottesville, VA 22908 USA Publisher: ENDOCRINE SOC, BETHESDA IDS Number: 628DC ISSN: 0021-972X

**Yazici AN, Chen RV, Solak S, et al. The analysis of thermoluminescent glow peaks of CaF2 : Dy (TLD-200) after beta-irradiationJ PHYS D APPL PHYS 35 (20): 2526-2535 OCT 21 2002

The analysis of thermoluminescent glow peaks of CaF2 : Dy (TLD-200) after beta-irradiationYazici AN, Chen RV, Solak S, Yegingil ZJOURNAL OF PHYSICS D-APPLIED PHYSICS 35 (20): 2526-2535 OCT 21 2002Document type: Article    Language: English    Cited References: 27    Times Cited: 0    Abstract:Variable dose (VD), T-m-T-stop, initial rise (IR), variable heating rate (VHR), peak shape (PS)

and computerized glow curve deconvolution (CGCD) methods are used to determine the number of peaks, the order of kinetics (b), the activation energy (Ea) and attempt-to-escape frequency (s) associated with the glow peaks in CaF2: Dy (TLD-200) after beta-irradiation between the dose level 0.1 and 110 Gy. The T-m-T-stop procedure indicates that the glow curve of this crystal consists of at least nine glow peaks. The dose variation experiment indicates that seven of them, namely peaks 1-6 and 8, are of first-order kinetics and peaks 7 and 9 are of general-order kinetics. However, the T-m-T-stop procedure and the CGCD method have indicated that peak 6 has general-order kinetics too. The activation energy found with the IR, VHR, PS and CGCD methods for peak 4 yield very close values. For all other peaks, there is no agreement between the results of all the applied methods. This work also indicates that the post-irradiation annealing and the heating rate have pronounced effects on the evaluated kinetic parameters of all glow peaks. KeyWords Plus: PARAMETERS, TL Addresses:Yazici AN, Univ Gaziantep, Dept Engn Phys, TR-27310 Gaziantep, TurkeyUniv Gaziantep, Dept Engn Phys, TR-27310 Gaziantep, TurkeyTel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys & Astron, IL-69978 Tel Aviv, IsraelCukurova Univ, Dept Phys, TR-01330 Adana, Turkey Publisher: IOP PUBLISHING LTD, BRISTOL IDS Number: 613KN ISSN: 0022-3727

Riabkov DY, Di Bella EVR Estimation of kinetic parameters without input functions: Analysis of three methods for multichannel blind identificationIEEE T BIO-MED ENG 49 (11): 1318-1327 NOV 2002

**Larsen MO, Elander M, Sturis J, et al. The conscious Gottingen minipig as a model for studying rapid pulsatile insulin secretion in vivoDIABETOLOGIA 45 (10): 1389-1396 OCT 2002

The conscious Gottingen minipig as a model for studying rapid pulsatile insulin secretion in vivoLarsen MO, Elander M, Sturis J, Wilken M, Carr RD, Rolin B, Porksen NDIABETOLOGIA 45 (10): 1389-1396 OCT 2002Document type: Article    Language: English    Cited References: 46    Times Cited: 0    Abstract:Aims/hypothesis. Pulsatile secretion is important for insulin action and suitable animal models are important tools for examining the role of impaired pulsatile insulin secretion as a possible link between beta-cell mass, function and morphology and insulin resistance. This study examines the vascular sampling site, insulin kinetics, pulsatility and the response to glucose pulse entrainment to evaluate the Gottingen minipig as a model for studying pulsatile insulin secretion. Methods. Basal and glucose entrained insulin secretion was examined in normal minipigs and evaluated by autocorrelation, cross correlation and deconvolution.Results. Cross correlation showed a relation between oscillations in insulin concentrations in the portal and jugular vein in anaesthetised animals (p<0.001 in all animals), confirming the usefulness of jugular vein sampling for pulse detection. Jugular vein sampling in conscious animals showed obvious oscillations allowing estimates of burst shape and insulin kinetics. Glucose entrainment improved the pulsatile pattern (autocorrelation: 0.555 +/- 0.148 entrained vs 0.350 +/- 0.197 basal, p=0.054). Deconvolution analysis resolved almost all insulin release as secretory bursts (69 +/- 20 basal vs 99.5 +/- 1.2% entrained, p<0.01) with a pulse interval (min)

of 6.6 +/- 2.2 (basal) and 9.4 +/- 1.5 (entrained) (p<0.05) and a pulse mass (pmol/l per pulse) which was higher after entrainment (228 +/- 117 vs 41.2 +/- 18.6 basal, p<0.001).Conclusion/interpretation. The ability to fit kinetic parameters directly by deconvolution of peripheral endogenous insulin concentration time series in combination with the suitability of jugular vein sampling, rapid kinetics and entrainability makes the Gottingen minipig ideal for mechanistic studies of insulin pulsatility and its effects on insulin action.Author Keywords:pulsatile insulin secretion, insulin kinetics, deconvolution, in vivo model, insulin action KeyWords Plus:CLINICAL CHEMICAL VALUES, PLASMA-INSULIN, METABOLIC SYNDROME, LIPID-METABOLISM, GLUCOSE, OSCILLATIONS, PIG, INDUCTION, DELIVERY, MONKEYS Addresses:Larsen MO, Novo Nordisk AS, Dept Pharmacol Res 1, Pharmacol, Res & Dev, Novo Alle 6A1-005, DK-2880 Bagsvaerd, DenmarkNovo Nordisk AS, Dept Pharmacol Res 1, Pharmacol, Res & Dev, DK-2880 Bagsvaerd, DenmarkRoyal Vet & Agr Univ, Dept Pharmacol & Pathobiol, Copenhagen, DenmarkNovo Nordisk AS, Dept Assay & Cell Technol, DK-2880 Bagsvaerd, DenmarkAarhus Univ Hosp, Dept Med M, DK-8000 Aarhus, Denmark Publisher: SPRINGER-VERLAG, NEW YORK IDS Number: 611DD ISSN: 0012-186X

*Kitis G, Pagonis V, Carty H, et al. Detailed kinetic study of the thermoluminescence glow curve of synthetic quartzRADIAT PROT DOSIM 100 (1-4): 225-228 2002

Detailed kinetic study of the thermoluminescence glow curve of synthetic quartzKitis G, Pagonis V, Carty H, Tatsis ERADIATION PROTECTION DOSIMETRY 100 (1-4): 225-228 2002Document type: Article    Language: English    Cited References: 10    Times Cited: 2    Abstract:A detailed kinetic analysis has been performed of the thermoluminescence (TL) glow curve of high purity synthetic quartz. The kinetic parameters of the glow peak at 110degreesC were evaluated for doses ranging from 0.1 Gy to 100 Gy using glow curve deconvolution (GCD), initial rise, variable heating rate and phosphorescence decay methods. All the methods gave results that agree within the experimental errors. KeyWords Plus:STIMULATED LUMINESCENCE, SUPERLINEARITY Addresses:Kitis G, Aristotle Univ Thessaloniki, Phys Nucl Lab, GR-54006 Thessaloniki, GreeceAristotle Univ Thessaloniki, Phys Nucl Lab, GR-54006 Thessaloniki, GreeceWestern Maryland Coll, Dept Phys, Westminster, MD 21158 USA Publisher: NUCLEAR TECHNOLOGY PUBL, ASHFORD IDS Number: 609JJ ISSN: 0144-8420

Kitis G, Furetta C, Sanipoli C Thermoluminescence properties of LiMgF3 doped with Ce, Er and DyRADIAT PROT DOSIM 100 (1-4): 247-250 2002

Thermoluminescence properties of LiMgF3 doped with Ce, Er and DyKitis G, Furetta C, Sanipoli CRADIATION PROTECTION DOSIMETRY 100 (1-4): 247-250 2002Document type: Article    Language: English    Cited References: 10    Times Cited: 0    Abstract:The main dosimetric properties are reported of a new perovskite. LiMgF3. doped with Ce, Er and Dy impurities. An annealing temperature of 400degreesC for one hour is necessary to erase any previous signal and to stabilise its sensitivity. A readout up to 450degreesC gives the same result. The glow curve structure consists of two intense and isolated glow peaks at 170degreesC and 315degreesC. The sensitivity of both glow peaks to beta irradiation increases as the dopant concentration increases. The sensitivity is higher than that of LiF:Mg,Ti using the glow peaks 4+5 integral. Other properties like TL dose response, fading, sensitivity versus successive readout and annealing cycles, sensitivity versus the heating rate, sensitivity to light and trapping parameter evaluation were also carried out. KeyWords Plus:CURVE DECONVOLUTION FUNCTIONS, CRYSTALS, KINETICS, LUMINESCENCE Addresses:Kitis G, Aristotle Univ Thessaloniki, Phys Nucl Lab, GR-54006 Thessaloniki, GreeceAristotle Univ Thessaloniki, Phys Nucl Lab, GR-54006 Thessaloniki, GreeceUniv Roma La Sapienza, Dept Phys, I-00185 Rome, Italy Publisher: NUCLEAR TECHNOLOGY PUBL, ASHFORD IDS Number: 609JJ ISSN: 0144-8420

Lee JI, Kim JL, Chang SY, et al. Analysis of the glow curves obtained from LiF : Mg,Cu,Na,Si TL material using the general order kinetics modelRADIAT PROT DOSIM 100 (1-4): 341-344 2002

Pagonis V, Tatsis E, Kitis G, et al. Search for common characteristics in the glow curves of quartz of various originsRADIAT PROT DOSIM 100 (1-4): 373-376 2002

*Oswald P, Desmet K, Sandra P, et al. Determination of the enantiomerization energy barrier of some 3-hydroxy-1,4-benzodiazepine drugs by supercritical fluid chromatographyJ CHROMATOGR B 779 (2): 283-295 NOV 5 2002 http://keszei.chem.elte.hu/DSP/Jchrom779.pdf

Determination of the enantiomerization energy barrier of some 3-hydroxy-1,4-benzodiazepine drugs by supercritical fluid chromatographyOswald P, Desmet K, Sandra P, Krupcik J, Majek P, Armstrong DWJOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES 779 (2): 283-295 NOV 5 2002Document type: Article    Language: English    Cited References: 46    Times Cited: 0    Abstract:The first-order kinetic equation for irreversible reactions was used to determine the enantiomerization barrier of some of 3-hydroxy-1,4-benzodiazepine enantiomers by supercritical fluid chromatography (SFC). The racemates of lorazepam, oxazepam and temazepam were separated by SFC on chiral (R,R)-Whelk-O1 column with supercritical carbon dioxide containing 12.5% methanol and 0.5% diethylamine as a mobile phase. Peak areas of enantiomers prior to (A(AO), A(BO)) and after the separation (A(A), A(B),), used for calculation of the enantiomerization barrier, were determined by computer-assisted peak deconvolution of peak

clusters from the chromatograms. It was demonstrated for the first time that using a model for a four-peak cluster produces height precise results, and most closely approximates the published results. The kinetic equation for irreversible reactions was used to determine apparent enantiomerization rate constants. The dependence of the apparent enatiornerization barrier (DeltaG(A-->B)(app), DeltaG(B-->A)(app)) on temperature was used to determine apparent activation enthalpy (DeltaH(R-->S)(app), DeltaH(S-->R)(app)) and entropy (DeltaS(R-->S)(app), DeltaS(S-->R)(app)) for all studied benzodiazepines. Elsevier Science B.V. All rights reserved. Author Keywords:enantiomerization energy barrier, enantiomer separation, lorazepam, temazepam, oxazepam KeyWords Plus:HUMAN-SERUM-ALBUMIN, PERFORMANCE LIQUID-CHROMATOGRAPHY, CHIRAL STATIONARY-PHASE, COMPUTER-SIMULATION, GAS-CHROMATOGRAPHY, ENANTIOSELECTIVE SEPARATION, INTERCONVERSION PROFILES, COLUMN, HPLC, BENZODIAZEPINES Addresses:Krupcik J, Slovak Univ Technol, Dept Analyt Chem, Radlinskeho 9, Bratislava 81237, SlovakiaSlovak Univ Technol, Dept Analyt Chem, Bratislava 81237, SlovakiaState Univ Ghent, Dept Organ Chem, B-9000 Ghent, BelgiumIowa State Univ Sci & Technol, Dept Chem, Ames, IA 50011 USA Publisher: ELSEVIER SCIENCE BV, AMSTERDAM IDS Number: 609ZR ISSN: 1570-0232

**Ros JMG, Kitis G Computerised glow curve deconvolution using general and mixed order kineticsRADIAT PROT DOSIM 101 (1-4): 47-52 2002

Computerised glow curve deconvolution using general and mixed order kineticsRos JMG, Kitis GRADIATION PROTECTION DOSIMETRY 101 (1-4): 47-52 2002Document type: Article    Language: English    Cited References: 10    Times Cited: 0    Abstract:Some accurate glow curve fitting functions for general and mixed order kinetics glow peaks are proposed and discussed. These mathematical expressions are used together with peak search and non-linear minimisation algorithins in order to provide a fast glow curve deconvolution for those materials which cannot he well fitted using first order kinetics. To test the accuracy of the proposed method, the result of the fitting of synthetic glow Curves is compared with the original data giving negligible errors for values of parameters currently found in TL materials. KeyWords Plus:DOSIMETRY Addresses:Ros JMG, CIEMAT, Av Complutense 22, E-28040 Madrid, SpainCIEMAT, E-28040 Madrid, SpainAristotle Univ Thessaloniki, Nucl Phys Lab, GR-54006 Thessaloniki, Greece Publisher: NUCLEAR TECHNOLOGY PUBL, ASHFORD IDS Number: 609JM ISSN: 0144-8420

Biderman S, Horowitz YS, Oster L, et al. Glow curve analysis of composite peak 5 in LiF : Mg,ti (TLD-100) using optical bleaching, thermal annealing and computerised glow curve deconvolutionRADIAT PROT DOSIM 101 (1-4): 69-72 2002

*Pagonis V, Kitis G On the possibility of using commercial software packages for thermoluminescence glow curve deconvolution analysisRADIAT PROT DOSIM 101 (1-4): 93-98 2002

On the possibility of using commercial software packages for thermoluminescence glow curve deconvolution analysisPagonis V, Kitis GRADIATION PROTECTION DOSIMETRY 101 (1-4): 93-98 2002Document type: Article    Language: English    Cited References: 10    Times Cited: 0    Abstract:This paper explores the possibility of using commercial software for thermoluminescence glow curve deconvlution (GCD) analysis. The program PEAKFIT has been used to perform GCD analysis of complex glow curves of quartz and dosimetric materials. First-order TL peaks were represented Successfully using the Weibull distribution function. Second-order and general-order TL peaks were represented accurately by using the Logistic asymmetric functions with varying symmetry parameters. Analytical expressions were derived for determining the energy E front the parameters of the Logistic asymmetric functions. The accuracy of these analytical expressions for E was tested for it wide variety of kinetic parameters and was found to be comparable to the commonly used expressions in the TL literature. The effectiveness of fit of the analytical functions used here was tested using the figure of merit (FOM) and was found to be comparable to the accuracy of recently published GCD expressions for first- and general-order kinetics. KeyWords Plus:ANALYSIS COMPUTER-PROGRAMS, FIT Addresses:Pagonis V, Western Maryland Coll, Dept Phys, Westminster, MD 21158 USAWestern Maryland Coll, Dept Phys, Westminster, MD 21158 USAAristotle Univ Thessaloniki, Nucl Phys Lab, GR-54006 Thessaloniki, Greece Publisher: NUCLEAR TECHNOLOGY PUBL, ASHFORD IDS Number: 609JM ISSN: 0144-8420

*Sartorio A, De Nicolao G, Liberati D An improved computational method to assess pituitary responsiveness to secretagogue stimuliEUR J ENDOCRINOL 147 (3): 323-332 SEP 2002

An improved computational method to assess pituitary responsiveness to secretagogue stimuliSartorio A, De Nicolao G, Liberati DEUROPEAN JOURNAL OF ENDOCRINOLOGY 147 (3): 323-332 SEP 2002Document type: Article    Language: English    Cited References: 20    Times Cited: 0    Abstract:Objective: The quantitative assessment of gland responsiveness to exogenous stimuli is typically carried out using the peak value of the hormone concentrations in plasma, the area under its curve (AUC), or through deconvolution analysis. However, none of these methods is satisfactory, due to either sensitivity to measurement errors or various sources of bias. The objective was to introduce and validate an easy-to-compute responsiveness index, robust in the face of measurement errors and interindividual variability of kinetics parameters. Design: The new method has been tested on responsiveness tests for the six pituitary hormones (using GH-releasing hormone, thyrotrophin-releasing hormone, gonadotrophin-releasing hormone and corticotrophin-releasing hormone as secretagogues), for a total of 174 tests. Hormone concentrations were assayed in six to eight samples between -30 min and 120 min from the stimulus.

Methods: An easy-to-compute direct formula has been worked out to assess the 'stimulated AUC', that is the part of the AUC of the response curve depending on the stimulus, as opposed to pre- and post-stimulus spontaneous secretion. The weights of the formula have been reported for the six pituitary hormones and some popular sampling protocols.Results and Conclusions: The new index is less sensitive to measurement error than the peak value. Moreover, it provides results that cannot be obtained from a simple scaling of either the peak value or the standard AUC. Future studies are needed to show whether the reduced sensitivity to measurement error and the proportionality to the amount of released hormone render the stimulated AUC indeed a valid alternative to the peak value for the diagnosis of the different pathophysiological states, such as, for instance, GH deficits.KeyWords Plus:GROWTH-HORMONE, METABOLIC-CLEARANCE, DECONVOLUTION, SECRETION, DEFICIENCY, LH Addresses:Sartorio A, IRCCS, Ist Auxol Italiano, LSRE, Via Ariosto 13, I-20145 Milan, ItalyIRCCS, Ist Auxol Italiano, LSRE, I-20145 Milan, ItalyIRCCS, Ist Auxol Italiano, Div Malattie Metab 3, Piancavallo, Verbania, ItalyUniv Pavia, Dipartimento Informat & Sistemist, I-27100 Pavia, ItalyPolitecn Milan, Dipartimento Elettr & Informat, CESTIA, Consiglio Nazl Ric, I-20133 Milan, Italy Publisher: BIO SCIENTIFICA LTD, BRISTOL IDS Number: 606QD ISSN: 0804-4643

*Diethelm S, Closset A, Van herle J, et al. Determination of chemical diffusion and surface exchange coefficients of oxygen by electrochemical impedance spectroscopyJ ELECTROCHEM SOC 149 (11): E424-E432 NOV 2002

Determination of chemical diffusion and surface exchange coefficients of oxygen by electrochemical impedance spectroscopyDiethelm S, Closset A, Van herle J, Nisancioglu KJOURNAL OF THE ELECTROCHEMICAL SOCIETY 149 (11): E424-E432 NOV 2002Document type: Article    Language: English    Cited References: 27    Times Cited: 0    Abstract:A rigorous mathematical model is developed for the complex impedance of a solid-state electrochemical cell, which is commonly used for the measurement of oxygen transport, oxygen exchange kinetics, and thermodynamic properties of nonstoichiometric mixed conducting oxides. The model leads to a simple equivalent circuit for the cell with unambiguous definition of the physical significance of its components. A method is proposed for the analysis of experimental data. The methodology thus developed is validated by comparing the experimental data measured for a well-studied perovskite (SrCo(0.5)Fe(0.5)O(32)d) with the results obtained from the completely equivalent potential-step technique. In addition, various electrochemical properties of the other cell components, such as Pt electrodes and yttria-stabilized zirconia electrolyte, also obtainable from measurements, show good agreement with the available literature data. The cell design, which significantly minimizes the gas space in contact with the sample, has a clear advantage over similar relaxation cells in terms of reducing the dominating effect of the gas-phase capacitance in numerical data analysis. A possible disadvantage, however, is the large impedance of the oxygen pump at low oxygen partial pressures, which may in a similar manner obstruct deconvolution of the sample properties from the measured data. (C) 2002 The Electrochemical Society.

KeyWords Plus:YTTRIA-STABILIZED ZIRCONIA, MIXED CONDUCTORS, TRANSPORT, CONDUCTIVITY, INTERFACE, OXIDES Addresses:Diethelm S, EPFL, Lab Energet Ind, CH-1015 Lausanne, SwitzerlandEcole Polytech Fed Lausanne, Lab Photon & Interfaces, CH-1015 Lausanne, SwitzerlandNorwegian Univ Sci & Technol, Dept Mat Technol & Electrochem, N-7491 Trondheim, Norway Publisher: ELECTROCHEMICAL SOC INC, PENNINGTON IDS Number: 604KV ISSN: 0013-4651

Rall LC, Walsmith JM, Snydman L, et al. Cachexia in rheumatoid arthritis is not explained by decreased growth hormone secretionARTHRITIS RHEUM 46 (10): 2574-2577 OCT 2002

Cachexia in rheumatoid arthritis is not explained by decreased growth hormone secretionRall LC, Walsmith JM, Snydman L, Reichlin S, Veldhuis JD, Kehayias JJ, Abad LW, Lundgren NT, Roubenoff RARTHRITIS AND RHEUMATISM 46 (10): 2574-2577 OCT 2002Document type: Article    Language: English    Cited References: 18    Times Cited: 0    Abstract:Objective. Patients with rheumatoid arthritis (RA) lose body cell mass (BCM) by unknown mechanisms. Since the loss of BCM in normal aging individuals parallels the characteristic age-related decline in growth hormone (GH) secretion, this study was carried out to determine whether further decreased GH secretion plays a role in the pathogenesis of this loss of BCM in RA patients, termed "rheumatoid cachexia." Methods. GH secretory kinetics were determined by deconvolution analysis in 16 patients with RA and 17 healthy controls matched for age (mean +/- SD 45.4 +/- 13.2 years and 47.1 +/- 14.6 years, respectively), sex, race, and body mass index. Blood samples were obtained every 20 minutes for 24 hours. Body composition was ascertained using total-body potassium (TBK) as a measure of BCM and dual x-ray absorptiometry to determine fat mass.Results. BCM was reduced in patients with RA compared with healthy controls (mean +/- SD gm TBK 79.5 +/- 9.5 versus 94.9 +/- 1.9, P < 0.0005), but there was no difference in fat mass. GH kinetic parameters in patients with RA did not differ from those in controls.Conclusion. These findings suggest that GH kinetics are unaltered in RA patients compared with healthy subjects; thus, GH deficiency does not account for rheumatoid cachexia.KeyWords Plus:TUMOR-NECROSIS-FACTOR, CHRONIC INFLAMMATION, BODY-COMPOSITION, POSTMENOPAUSAL WOMEN, MASS, STRENGTH Addresses:Roubenoff R, Tufts Univ, Nutr Exercise Physiol & Sarcopenia Lab, Jean Mayer USDA HNRCA, 711 Washington St, Boston, MA 02111 USATufts Univ, Nutr Exercise Physiol & Sarcopenia Lab, Jean Mayer USDA HNRCA, Boston, MA 02111 USAUniv Arizona, Coll Med, Tucson, AZ USAUniv Virginia, Hlth Sci Ctr, Charlottesville, VA 22903 USATufts Univ New England Med Ctr, Boston, MA 02111 USA Publisher: WILEY-LISS, NEW YORK IDS Number: 604QX ISSN: 0004-3591

*Suda Y, Ono T, Akazawa M, et al.

Preparation of carbon nanoparticles by plasma-assisted pulsed laser deposition method - size and binding energy dependence on ambient gas pressure and plasma conditionTHIN SOLID FILMS 415 (1-2): 15-20 AUG 1 2002 http://keszei.chem.elte.hu/DSP/ThinSolidFilm415.pdf

Preparation of carbon nanoparticles by plasma-assisted pulsed laser deposition method - size and binding energy dependence on ambient gas pressure and plasma conditionSuda Y, Ono T, Akazawa M, Sakai Y, Tsujino J, Homma NTHIN SOLID FILMS 415 (1-2): 15-20 AUG 1 2002Document type: Article    Language: English    Cited References: 26    Times Cited: 0    Abstract:Nanometer-size carbon particles were prepared on a Si substrate using pulsed laser deposition (PLD) assisted by radio frequency (RF) Ar plasma and were compared with ones prepared by PLD in vacuum and Ar gas. In both the plasma and gas ambiences, experiments were carried out in Ar pressure p(Ar) ranging from 0.13 to 13 Pa. The particle size increased as p(Ar) increased. However, the size obtained in the RF Ar plasma was approximately 1.5 times larger than that prepared in the Ar gas. An X-ray photoelectron spectroscopy (XPS) analysis revealed that the carbon film covered by the particles was in an amorphous state. The sp(3)/sp(2) carbon ratio of the film was evaluated by deconvolution of XPS carbon (Is) spectra into three components, which are attributed to diamond (sp(3)), graphite (sp(2)) and carbon oxide components. The highest sp(3) /sp(2) ratio was 0.4 in the Ar gas and Ar plasma at p(Ar) = 0.13 Pa. The sp(3) /sp(2) ratio decreases monotonously, as the particle size increases. The ratio obtained in the Ar plasma is larger than that in the Ar gas. The effects of p(Ar) and plasma for nanoparticle characteristics are discussed. (C) 2002 Elsevier Science B.V. All rights reserved. Author Keywords:nanoparticle, laser ablation, carbon, RF plasma, amorphous materials KeyWords Plus:DIAMOND-LIKE-CARBON, ION KINETIC-ENERGY, SUBPLANTATION MODEL, FILM GROWTH, ABLATION, SP(3), WAVELENGTH, PARTICLES, EMISSION, XPS Addresses:Sakai Y, Hokkaido Univ, Grad Sch Engn, Dept Ingn Elect & Informat, North 13,West 8, Sapporo, Hokkaido 0608628, JapanHokkaido Univ, Grad Sch Engn, Dept Ingn Elect & Informat, Sapporo, Hokkaido 0608628, JapanHokkaido Elect Power Co Inc, Ebetsu, Hokkaido 0670033, Japan Publisher: ELSEVIER SCIENCE SA, LAUSANNE IDS Number: 596ZW ISSN: 0040-6090

Earnhardt RC, Veldhuis JD, Cornett G, et al. Pathophysiology of hyperinsulinemia following pancreas transplantation - Altered pulsatile versus basal insulin secretion and the role of specific transplant anatomy in dogsANN SURG 236 (4): 480-491 OCT 2002

**Nugent-Glandorf L, Scheer M, Samuels DA, et al. Ultrafast photodissociation of Br-2: Laser-generated high-harmonic soft x-ray probing of the transient photoelectron spectra and ionization cross sectionsJ CHEM PHYS 117 (13): 6108-6116 OCT 1 2002 http://keszei.chem.elte.hu/DSP/JCP117.pdf

Ultrafast photodissociation of Br-2: Laser-generated high-harmonic soft x-ray probing of the transient photoelectron spectra and ionization cross sectionsNugent-Glandorf L, Scheer M, Samuels DA, Bierbaum VM, Leone SRJOURNAL OF CHEMICAL PHYSICS 117 (13): 6108-6116 OCT 1 2002Document type: Article    Language: English    Cited References: 28    Times Cited: 0   

Abstract:The ultrafast dissociation of gas-phase Br-2 is probed via a 400 nm pump soft-x-ray probe scheme at five different high-order harmonic wavelengths (13th, 15th, 17th, 19th, and 21st of an 800 nm Ti:sapphire laser). A series of time-resolved ultrafast photoelectron spectra reveals prompt two-photon ionization features, which allow in situ measurement of the cross correlation between the pump and probe pulses. Transient features are attributed to ionization of the dissociative excited state wave packet, and new spectral peaks are associated with the formation of atomic Br. Deconvolution of time-trace plots of the atomic signals with the cross-correlation pulse durations reveal similar dissociation times (similar to40 fs) at two probe wavelengths (47 and 42 nm). Analysis of the transient wave packet photoelectron signal suggests an ionization process that occurs during dissociation, with a broad electron kinetic energy distribution at an extended Br-Br bond length (R greater than or equal to3 Angstrom). At long delay times (greater than or equal to500 fs), an enhancement of the ionization cross section of the Br atom compared to the Br-2 molecule is observed with each of the probe wavelengths, the ratio increasing from a factor of 21+/-1 to 56+/-5 for probe wavelengths of 61.5 to 38 nm, respectively. The intensity of the transient wave packet signal on the dissociative state remains nearly constant between the 17th and 19th harmonic probes, indicating that the ionization cross section of the dissociative state has an entirely different wavelength dependence than the Br atom. The transient wave packet ionization signal is qualitatively 10%-20% of the simultaneous two-photon (400 nm+soft x-ray) ionization signal. The results are discussed in terms of the transient dynamics of dissociative state photoelectron spectroscopy, the correlation between molecular and atomic ionization probabilities, and above threshold ionization probabilities. (C) 2002 American Institute of Physics. KeyWords Plus:HIGH-ORDER HARMONICS, SPECTROSCOPY, DYNAMICS, PULSES, PHASE Addresses:Nugent-Glandorf L, Nortel Networks, M-S 04332F15, Nepean, ON K2H 8E9, CanadaNatl Inst Stand & Technol, Joint Inst Lab Astrophys, Dept Phys, Dept Chem & Biochem, Boulder, CO 80309 USA, Univ Colorado, Boulder, CO 80309 USA Publisher: AMER INST PHYSICS, MELVILLE IDS Number: 593BV ISSN: 0021-9606

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