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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Langmuir 3 (1987), S. 1098-1102 
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 45 (1967), S. 733-733 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The determination of oxyhemoglobin by means of the amount of oxygen, which will be bound by the free hemoglobin of a sample of blood is realized by measuring the absorbed oxygen, contained in a phosphate buffer solution. the decrease of the current of a galvanic goldamalgam-zinc element indicates the equivalent of the micrograms of oxygen, removed by the free hemoglobin of the blood, when added to the buffer solution. Total oxygen capacity of the blood sample minus the amount of removed oxygen, yields the oxyhemoglobin. The whole procedure lasts about one minute, the time of calibration included.
    Notes: Zusammenfassung Durch Strommessung mit Hilfe des galvanischen Elements Goldamalgam-Zink (Messung in schnell bewegter Phosphatpufferlösung) konnte diejenige Sauerstoffmenge direkt von einem Galvanometer abgelesen werden, welche durch das freie Hämoglobin einer zugegebenen Blutprobe gebunden wird. Die Reaktion erfolgt in wenigen Sekunden, so daß die Messung des freien Hämoglobins einschließlich Eichung in etwa 1 min durchführbar ist. Zieht man das freie Hämoglobin vom Gesamthämoglobin ab, so erhält man das Oxyhämoglobin.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 40 (1962), S. 918-919 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 40 (1962), S. 883-889 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung 1. Bei Hunden kommt es unter der Bedingung einer normalen Diurese nach Ureterabklemmung zur Entwicklung des sog. „hohen“ Ureterdruckes, dessen Plateau Ausdruck eines Gleichgewichtes von Glomerulusfiltration und tubulärer Rückresorption ist, weil das mit Inulin indirekt bestimmte Glomerulusfiltrat gegenüber dem Ausgangswert entweder unverändert oder nur reduziert gefunden wurde. 2. Unter osmotischer Diurese kommt es nach Ureterabklemmung zur Ausbildung des „maximalen“ Ureterdruckes, bei dem nicht mehr filtriert werden kann. 3. Der intratubuläre Druckanstieg führt zu einer Zunahme des intraglomerulären Capillardruckes, so daß während des „hohen“ Ureterdruckes der effektive Filtrationsdruck unverändert gefunden werden kann. Der „maximale“ Ureterdruck übersteigt den „hohen“ um den bisherigen Betrag des effektiven Filtrationsdruckes. 4. Die Zunahme des intraglomerulären Capillardruckes (Autoregulation des Glomerulusfiltrates) ist die Folge einer venösen Abflußbehinderung durch druckbedingte Erweiterung der Tubuluslumina und die Folge einer Erweiterung des Vas afferens. 5. Das Ausmaß der Erweiterung des Vas afferens bestimmt das Verhalten der Nierendurchblutung bei intrarenalem Druckanstieg durch Harnabflußbehinderung. Die präglomeruläre Widerstandsabnahme kann trotz gesteigerter intrarenaler Drucke die postglomeruläre Widerstandszunahme kompensieren — oder sogar überwiegen, so daß dann die Nierendurchblutung zunimmt. 6. Es wird dieDilatation des Vas afferens beiintrarenalem (intratubulärem) Druckanstieg gegenübergestellt derConstriction dieses Gefäßes beiintraarteriellem Druckanstieg (Autoregulation der Nierendurchblutung).
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 26 (1984), S. 727-734 
    ISSN: 1432-1041
    Keywords: adverse drug reactions ; psychotropic drugs ; intensive drug monitoring ; organized spontaneous reporting ; psychiatric patients ; adverse reaction frequency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary A system for monitoring adverse drug reactions (ADR) in psychiatric inpatients was introduced in psychiatric hospitals in the FRG in May 1979. It consists of intensive drug monitoring (IDM) and a so-called “organized spontaneous reporting system” (OSR). ADR are rated separately according to impact on therapy and probability of causal relationship. With IDM all ADR (Grades I–III) are assessed in a randomly selected sample of inpatients. With OSR only ADR leading to discontinuation of the drugs in question (=ADR Grade III) are assessed. In 406 drug-treated inpatients monitored by IDM in the psychiatric hospitals of Berlin and Munich from May 1979 to Dec. 1981, ADR were observed in 60,4%. In 15% of IDM-patients ADR led to discontinuation of the drugs in question; with OSR the relative frequency of these Grade III ADR was 9,0% in 5096 patients monitored throughout the entire period. Life-threatening events were observed in 1,2% of patients undergoing IDM as well as 1.2% of those undergoing OSR. The most frequently observed ADR by IDM were sedation, extrapyramidal signs, disturbances of the autonomic nervous system and increase in transaminases, and by OSR Parkinsonism, akathisia, sedation, toxic delirium and increased transaminases. The relative frequency of Grade III ADR was similar for neuroleptics and antidepressants (5,4% and 5,3% in OSR); a very low relative frequency of ADR Grade III was found for tranquilizers and hypnotics (0,7% and 0,2%). Methodological aspects of this drug monitoring system are discussed in the light of current literature.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1041
    Keywords: drug surveillance ; adverse drug reactions ; psychotropic drugs ; comparison of assessment methods ; inter-rater agreement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Within an ongoing drug surveillance project (AMÜP) in psychiatric hospitals, a comparative study was carried out to evaluate two methods commonly used in the field of adverse drug reaction assessment. Two raters, who have cooperated with the project since its inception, evaluated 80 randomly selected ADRs twice; first, by an empirical (implicit) approach, and second, 4 weeks later, by using an algorithm as proposed by Kramer et al. 1979. Agreement on medication and related probability ratings was obtained in 81% of all 80 cases for the empirical method (weighted Kappa=0.41), and in 69% for the algorithmic method (weighted Kappa=0.62), indicating that agreement exceeded chance for both methods. By comparison with assessments made in previous case conferences of the project, empirical ratings were found to be reliable over time due to homogeneous use of criteria by project raters. In contrast to the reports on the subject, agreement between raters appeared to be superior in the empirical method as compared to the algorithmic assessment. Analysis of disagreements suggested that probability ratings based on the empirical method were nonspecific, due to conventional criteria applied in the project. Inter-rater agreement was reduced by polypharmacy, especially in the case of algorithmic assessments. The consistency of assessment was also lowered by the fact that the 2 methods assigned different weights to particular assessment criteria.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 8306-8313 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Kinetic oscillations in catalytic reactions are often attributed either to attractive absorbate–absorbate interactions between adatoms or to required vacant sites for chemical reaction and are usually described by ordinary differential equations. These mechanisms are examined as possible causes for oscillations in surface reactions using Monte Carlo simulations. Self-sustained oscillations driven by a phase transition on the catalyst surface are found. It is shown that spatial inhomogeneity of the surface controls the existence of oscillations which therefore cannot be modeled using ordinary differential equations. The problem of synchronization of numerous oscillators on the surface is investigated. In particular, the influence of adatom migration and surface defects on Hopf bifurcation is examined. It is demonstrated that sites on surface with strong binding energy result in more chaotic oscillations whose amplitude decreases. The influence of concentration and distribution of defects on the kinetic oscillations is discussed.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 5374-5386 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Oscillations with large amplitudes (〉500 K), high frequencies (〉8 Hz), and good reproducibility are observed in methylamine decomposition on electrically heated Pt, Rh, and Ir wires at pressures of 0.25–8.0 Torr and temperatures between 900 and 1500 K. The major reaction involves formation of HCN which is endothermic by 37 kcal/mol, so that the reaction strongly cools the wire, which counteracts resistive heating. A photodiode array was used to monitor spatial and temporal oscillations with resolutions of 1 mm and 30 Hz, respectively. On Pt, the frequency increased with increasing pressure and with decreasing wire diameter, while amplitude was a weak function of these parameters. On Ir, oscillations were more complex with regions of the wire often oscillating independently and more variability between experiments. However, the overall behavior resembles that on Pt. On Rh, frequencies were much lower (〈0.03 Hz), oscillations occurred over a smaller temperature range and halves of the wire frequently oscillated out of phase with each other. Oscillatory behavior of methylamine decomposition on Pt was modeled by a simple lumped model which gives semiquantitative agreement with observations. The model assumes a simple unimolecular reaction with CH3NH2 adsorption blocked at low temperatures by formation of a strongly adsorbed CN which is known to be very stable on Pt (Ed (approximately-equal-to)50 kcal/mol). Calculated frequencies, pressure dependencies, amplitudes, and temperature range of oscillations agree quite well with experiments using reasonable values for adsorption and reaction rate parameters, and wire geometry and properties.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6597-6604 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Surface diffusion of hydrogen, deuterium, and CO on Rh(111) has been investigated by laser-induced thermal desorption (LITD) and compared with previous results for these species on Pt(111) and on other metals. As the coverage θ of deuterium increases from 0.02 to 0.33, the preexponential factor D0 remains constant at 8×10−2 cm2/s, but the diffusion activation energy Ediff rises from 3.7 to 4.3 kcal/mol. Ediff for hydrogen is 0.6 kcal/mol lower than for deuterium, consistent with the difference in zero-point energy. For CO, Ediff =7 kcal/mol at all coverages, but D0 rises from 10−3 to 10−2 cm2/s between θ=0.01 and 0.40. Values of Ediff for these adsorbates vary by several orders of magnitude for surfaces on which heats of adsorption are essentially identical. These differences appear to correlate with differences in heats of adsorption in different binding states which form saddle point configurations in surface diffusion. Ediff is found to be nearly identical to the reaction activation energies for the CO and hydrogen oxidation reactions on Rh and on several other transition metal surfaces. This suggests that surface diffusion of the reducing agent may be the rate-limiting step in their bimolecular surface reactions.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 745-756 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Complex behavior of an oscillating reaction on an array of catalytic regions was modeled using a distributed model consisting of a 10×10 matrix with ten randomly placed oscillators coupled via heat transfer. Each single oscillator was described by a very simple system of two differential equations chosen to model the CO/NO reaction on supported Pd. However, the coupled system exhibited very complex behavior with periodic oscillations, period multiplications, beat structures and chaos. All of these complex features predicted by the model have also been found in experiments. In addition, the model was able to predict the experimentally observed tendencies in the development of complex behavior with changing reaction conditions. Changing distributions of the cells or introducing small differences in the description of the single oscillators did not change the principal features of the system. However, the transition to chaos could be changed in that for one distribution of active cells a Feigenbaum sequence to chaos was found but not in another. With one oscillator twice as active as the rest of the cells, the high activity cell was dominant and entrained the whole system, leading to completely synchronized behavior. Also in this situation, however, chaotic responses were found, when the high activity oscillator was in a stable ignited state. Possible generalizations of this treatment to other oscillating systems are discussed.
    Type of Medium: Electronic Resource
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