oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 2 )

2019 ( 206 )

2018 ( 321 )

2017 ( 296 )

Custom range...

Search Results: 1 - 10 of 297576 matches for " J. Schreiner "
All listed articles are free for downloading (OA Articles)
Page 1 /297576
Display every page Item
Determina o de metais em corantes alimentícios artificiais = Determination of metals in food dyes products
Cleber Antonio Lindino,Affonso Celso Gon?alves Júnior,Gracilene Gisele Orth Schreiner,Jackson Spohr Schreiner
Acta Scientiarum : Technology , 2008,
Abstract: Em raz o da grande utiliza o de corantes alimentícios artificiais nos mais diferentes produtos, o controle de qualidade se torna imprescindível. Um dos problemas que pode estar presente, nestes corantes, é o teor elevado de metais tóxicos em sua composi o, provenientes da contamina o da síntese da matéria-prima ou do processo de manufatura. Neste trabalho, os corantes em solu o foram caracterizados por espectrofotometria na regi o do visível e ultravioleta. Posteriormente, foram determinados os metais Pb, Cd, Al, Cr e As, em solu es aquo-alcóolicas de corantes artificiais, vendidas comercialmente. Foram encontrados todos metais pesados tóxicos estudados nas amostras de dois diferentes lotes de corantes, com alto coeficiente de varia o, com o As excedendo os limites legais em um dos lotes. Synthetic food dyes is the most additives using in food products in high concentration more time, in that the quality control is indispensable. The concentration of toxic metals in most of productsexceeded the limit of legislation, due to contamination by raw material or manufacturing process. This paper was determinate Pb, Cd, Al, Cr and As in solutions of synthetic food dyes. All of these metals were determinated with high variation coefficient.
Early onset of treatment effects with oral risperidone
Thomas J Raedler, Andreas Schreiner, Dieter Naber, Klaus Wiedemann
BMC Psychiatry , 2007, DOI: 10.1186/1471-244x-7-4
Abstract: In this observational study, 48 inpatients with acutely decompensated schizophrenia were offered antipsychotic treatment with oral risperidone. PANSS-ratings were obtained on day 0, day 1, day 3, day 7 and day 14.Significant effects of treatment were already present on day 1 and continued throughout the study. The PANSS positive subscore and the PANSS total score improved significantly more than the PANSS negative subscore.Our results are consistent with the growing number of studies suggesting an early onset of antipsychotic treatment effects. However, non-pharmacological effects of treatment also need to be taken into consideration.Since their introduction half a century ago, antipsychotics have constituted the backbone of pharmacological treatment of psychosis. In accordance with other groups of psychotropic agents (e.g. antidepressants), a substantial time-lag has been postulated between the initiation of antipsychotic treatment and the onset of the antipsychotic effect. However, this concept of a delayed onset of action has been challenged recently and an earlier onset of antipsychotic treatment effects has been proposed [1,2].Our group has recently shown that the atypical antipsychotic risperidone is effective in the treatment of acutely decompensated patients with schizophrenia [3]. In this manuscript we present an analysis of the time-course of treatment effects in acutely decompensated patients with schizophrenia, who remained in treatment.A detailed description of the study-design was previously published [3]. In brief, acutely decompensated subjects with schizophrenia were offered treatment with oral risperidone (daily dose 4 – 8 mg given in two doses) upon admission to the secure unit of the Dept. of Psychiatry of the University Medical Center Hamburg-Eppendorf. This unit serves a catchment-area of approximately 250.000 inhabitants of the city of Hamburg, Germany. Benzodiazepines (diazepam 5 – 60 mg/d and lorazepam 0.5 – 10 mg/d) as well as anticholinerg
Composition analysis of liquid particles in the Arctic stratosphere
C. Weisser,K. Mauersberger,J. Schreiner,N. Larsen
Atmospheric Chemistry and Physics Discussions , 2004,
Abstract: Synoptic scale polar stratospheric clouds (PSCs) that formed without the presence of mountain leewaves were observed in early December 2002 from Kiruna/Sweden using balloon-borne instruments. The physical, chemical, and optical properties of the particles were measured. Within the PSC solid particles existed whenever the temperature was below the equilibrium temperature for nitric acid trihydrate and liquid particles appeared when the temperature fell below an even lower threshold about 3 K above the frost point. The correlation of liquid supercooled ternary solution aerosols with local temperatures is a pronounced feature observed during this flight although the molar ratios H2O/HNO3 were about a factor of 2 higher than model predictions. In addition HCl has been measured for the first time in liquid aerosols. The chlorine isotope signature served as a unique tool to identify unambiguously HCl dissolved in STS particles. Within a narrow temperature range of about three degrees above the frost point, measured HCl molar ratios are below 1 weight%. There is only fair agreement with model predictions.
Composition analysis of liquid particles in the Arctic stratosphere under synoptic conditions
C. Weisser,K. Mauersberger,J. Schreiner,N. Larsen
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2006,
Abstract: Synoptic scale polar stratospheric clouds (PSCs) that formed without the presence of mountain lee waves were observed in early December 2002 from Kiruna/Sweden using balloon-borne instruments. The physical, chemical, and optical properties of the particles were measured. Within the PSC solid particles existed whenever the temperature was below the equilibrium temperature for nitric acid trihydrate and liquid particles appeared when the temperature fell below an even lower threshold about 3 K above the frost point with solid particles still present. The correlation of liquid supercooled ternary solution aerosols with local temperatures is a pronounced feature observed during this flight; average molar ratios H2O/HNO3 were somewhat higher than predicted by models. In addition HCl has been measured for the first time in liquid aerosols. The chlorine isotope signature served as a unique tool to identify unambiguously HCl dissolved in STS particles. Within a narrow temperature range of about three degrees above the frost point, the measured average amount of HCl in liquid particles is below 1 weight%.
Interpretation of the Underground Muon Charge Ratio
P. A. Schreiner,J. Reichenbacher,M. C. Goodman
Physics , 2009, DOI: 10.1016/j.astropartphys.2009.06.002
Abstract: The MINOS experiment has observed a rise in the underground muon charge ratio $r_\mu$ = ${\mu^+/\mu^-}$. This ratio can be related to the atmospheric production ratios of ${\pi^+/\pi^-}$ and ${K^+/K^-}$. Our analysis indicates that the relevant variable for studying the charge ratio+ $\ecos$, rather than $\emu$. We compare a simple energy dependent parameterization of the rise in the charge ratio with more detailed previously published Monte Carlo simulations and an analytical calculation. We also estimate the size of two previously neglected effects in this context: the charge sign dependency of the dE/dx in rock, and the energy dependence of heavy primaries on the derived ${K^+/K^-}$ ratio.
Gondang-Musik als überlieferungsgestalt Altv lkischer Lebensordnung
L. Schreiner
Bijdragen tot de Taal-, Land- en Volkenkunde , 1970,
Abstract:
Computer-Assisted Program Reasoning Based on a Relational Semantics of Programs
Wolfgang Schreiner
Electronic Proceedings in Theoretical Computer Science , 2012, DOI: 10.4204/eptcs.79.8
Abstract: We present an approach to program reasoning which inserts between a program and its verification conditions an additional layer, the denotation of the program expressed in a declarative form. The program is first translated into its denotation from which subsequently the verification conditions are generated. However, even before (and independently of) any verification attempt, one may investigate the denotation itself to get insight into the "semantic essence" of the program, in particular to see whether the denotation indeed gives reason to believe that the program has the expected behavior. Errors in the program and in the meta-information may thus be detected and fixed prior to actually performing the formal verification. More concretely, following the relational approach to program semantics, we model the effect of a program as a binary relation on program states. A formal calculus is devised to derive from a program a logic formula that describes this relation and is subject for inspection and manipulation. We have implemented this idea in a comprehensive form in the RISC ProgramExplorer, a new program reasoning environment for educational purposes which encompasses the previously developed RISC ProofNavigator as an interactive proving assistant.
Encoding of Temporal Information by Timing, Rate, and Place in Cat Auditory Cortex
Kazuo Imaizumi,Nicholas J. Priebe,Tatyana O. Sharpee,Steven W. Cheung,Christoph E. Schreiner
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0011531
Abstract: A central goal in auditory neuroscience is to understand the neural coding of species-specific communication and human speech sounds. Low-rate repetitive sounds are elemental features of communication sounds, and core auditory cortical regions have been implicated in processing these information-bearing elements. Repetitive sounds could be encoded by at least three neural response properties: 1) the event-locked spike-timing precision, 2) the mean firing rate, and 3) the interspike interval (ISI). To determine how well these response aspects capture information about the repetition rate stimulus, we measured local group responses of cortical neurons in cat anterior auditory field (AAF) to click trains and calculated their mutual information based on these different codes. ISIs of the multiunit responses carried substantially higher information about low repetition rates than either spike-timing precision or firing rate. Combining firing rate and ISI codes was synergistic and captured modestly more repetition information. Spatial distribution analyses showed distinct local clustering properties for each encoding scheme for repetition information indicative of a place code. Diversity in local processing emphasis and distribution of different repetition rate codes across AAF may give rise to concurrent feed-forward processing streams that contribute differently to higher-order sound analysis.
Electrochemical Characterization of1-Ethyl-3-methylimidazolium Thiocyanate and Measurement of Triiodide Diffusion Coefficients in Blends of two Ionic Liquids
M. Zistler, C. Schreiner, P. Wachter, P. Wasserscheid, D. Gerhard and H. J. Gores
International Journal of Electrochemical Science , 2008,
Abstract: According to literature, binary mixtures of ionic liquids (ILs) such as 1-methyl-3-propylimidazolium iodide (MPII) as an iodide source and another IL of low viscosity such as 1-ethyl-3-methylimidazolium thiocyanate (EMISCN) may be used to increase the diffusion coefficients of redox-active species (I-/I3-). As dye-sensitized solar cells (DSCs) are diffusion limited a better performance may result with blends when compared to cells based on MPII alone. In order to learn more about EMISCN and its blends with MPII, we electrochemically characterized this IL and measured diffusion coefficients of triiodide in binary mixtures containing EMISCN by polarization and impedance studies at thin layer cells with a distance between Pt-electrodes of about 30 to 40 μm. The electrochemical windows of the used ILs were measured by cyclic voltammetry (CV) and compared to those of other ILs, recently investigated by us.
Microbial food web dynamics along a soil chronosequence of a glacier forefield
J. Esperschütz,A. Pérez-de-Mora,K. Schreiner,G. Welzl
Biogeosciences Discussions , 2011, DOI: 10.5194/bgd-8-1275-2011
Abstract: Microbial food webs are critical for efficient nutrient turnover providing the basis for functional and stable ecosystems. However, the successional development of such microbial food webs and their role in "young" ecosystems is unclear. Due to a continuous glacier retreat since the middle of the 19th century, glacier forefields have expanded offering an excellent opportunity to study food web development at differently developed soils. In the present study, litter degradation and the corresponding C fluxes into microbial communities were investigated along the forefield of the Damma glacier (Switzerland). 13C-enriched litter of the pioneering plant Leucanthemopsis alpina (L.) Heywood was incorporated into the soil at sites that have been free from ice for approximately 10, 60, 100 and more than 700 years. The structure and function of microbial communities were identified by 13C analysis of phospholipid fatty acids (PLFA) and phospholipid ether lipids (PLEL). Results showed increasing microbial diversity and biomass, and enhanced proliferation of bacterial groups as ecosystem development progressed. Initially, litter decomposition proceeded faster at the more developed sites, but at the end of the experiment loss of litter mass was similar at all sites, once the more easily-degradable litter fraction was processed. As a result incorporation of 13C into microbial biomass was more evident during the first weeks of litter decomposition. 13C enrichments of both PLEL and PUFA biomarkers following litter incorporation were observed at all sites, suggesting similar microbial foodwebs at all stages of soil development. Nonetheless, the contribution of bacteria and actinomycetes to litter turnover became more pronounced as soil age increased in detriment of archaea, fungi and protozoa, more prominent in recently deglaciated terrain.
Page 1 /297576
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.