Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 60 (1921), S. 382-384 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 116 (1994), S. 6001-6002 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 30 (1982), S. 392-394 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1432-1041
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Zusammenfassung Es warden 165 CO2-Antwort-kurven von 74 lungengestmden, jungen Probanden über-wiegend vor und nach Applikation eines Pharmakons ausgewertet. Dabei warden folgende Ergebnisse gewonnen: — 1. Der sog. Erregbarkeitsquotient (EQ) betrug bei diesen im Mittel 24,24 Jahre alien 74 Versuchspersonen 2.32±1.33 1/min/mm Hg. Die 54 männlichen Versuchspersonen (mittleres Alter 24.35 Jahre) hatten einen EQ von 2.58±1.12 1/min/mm Hg, die 20 weiblichen Versuchspersonen (mittleres Alter 23.95 Jahre) einen EQ von 2.12±0.851/min/mm Hg. Der Unterschied zwischen Männern und Frauen war mit p = 0.06 gerade nicht mehr signifikant. — 2. Die i.v. Injektion von 2 ml physiologischer Kochsalzlösung veränderte den EQ nicht. — 3. Bei einer zweiten Messung des EQ beim gleichen Probanden in einem Zeitraum bis zu mehreren Monaten ergab sich kein signifikanter Unterschied im Laufe dieses Zeitraumes. — 4. Valium® Roche (Diazepam) in einer Dosierung von 20 mg i.m. führte zu einer signifikanten Abnahme des EQ im Mittel um 28 %. Die Infusion einer 0.8 %igen Distraneurin®-Lösung (Chlormethiazol) bis zum Einschlafen der Probanden führte zu einer Abnahme des EQ im Mittel um 24 %. Wohl wegen der kleinen Zahl (n = 5) ist das letzte Resultat nicht signifikant. — 5. Micoren® (Prethcamid) führte zu einer mcht signifikanten Zunahme des EQ im Mittel um 31%. — 6. Zwei noch nicht im Handel befindliche Medikamente (UCB 1402 and CG 423) hatten in der geprüften Dosierung and Applikationsform keinen signifikanten Einfluß auf den EQ. — Weiterhin wurden 25 Untersuchungen an Patienten mit chronischen obstruktiven Lungenerkrankungen, alveolarer Hypoventilation und kompensierter respiratorischer Acidose durchgeführt. Diese Kranken warden in drei hinsichtlich Alter und Schweregrad vergleichbare Kollektive eingeteilt. Die Auswirkungen einer i.v. Injektion von 10 mg Valium® und von 50 mg UCB 1402 bzw. der Infusion einer 0,8-%igen Distraneurin®-Lösung warden an den Blutgasen verfolgt. Es ergaben sich folgende Resultate: — 1. Valium® Roche, das in einer Dosierung von 20 mg i. m. eine signifikante Abnahme des EQ bewirkte, führte auch zu einem signifikanten Anstieg des arteriellen CO2-Druckes. — 2. Distraneurin®, das einen ähnlichen Abfall des EQ bewirkte, der sich aber — wohl wegen der kleinen Zahl von Probanden — nicht sichern ließ, führte ebenfalls zu einem signifikanten Anstieg des arteriellen CO2-Druckes. — 3. UCB 1402, das den EQ nicht signifikant beeinflußte, erbrachte trotz seiner sedierenden Komponente auch keinen signifikanten Anstieg des arteriellen CO2-Druckes. — Die Bedeutung derartiger Untersuchungen und Befunde für praktisch medizinische Belange wird diskutiert.
    Notes: Summary 165 CO2-response-curves of 74 young test persons without evidence of lung disease were analysed, most of them before and after application of a drug. The following results were obtained: — 1. The so called “excitability quotient” (EQ) — that means the slope of the excitability curve — of these 74 test persons (mean age 24.24 years) was 2.32±1.33 1/min/mm Hg. The 54 males (mean age 24.35 years) had an EQ of 2.58±1.12 1/min/mm Hg, the 20 females (mean age 23.95 ,years) had an EQ of 2.12±0.85 1/min/mm Hg. The difference between males and females was not significant (p = 0.06). —2. Intravenous injection of 2 ml of physiological sodium chloride solution had no influence upon the EQ. — 3. A second measurement of the EQ in the same person, after an interval of up to several months, showed no significant difference as compared with the first measurement. —4. Valiumg® (Diazepam) in a dose of 20 mg intramuscularly caused a mean decrease of the EQ of 28% which was statistically significant. An infusion of a 0.8% Distraneurin® (Chlormethiazol) solution in a dose that made the test person fall asleep, caused a mean diminution of the EQ of 24%. Probably because of the small number (n = 5) of test persons, the result is not statistically significant. — 5. Micoren® (Prethcamid) caused a not significant mean increase of the EQ of 31%. — 6. Two drugs which are still in clinical trial (UCB 1402 and CG 423) had — in the dose and the application used —no significant influence upon the EQ. — In addition, 25 studies were performed in patients with chronic obstructive lung diseases, alveolar hypoventilation, and compensated respiratory acidosis. These patients were divided into three groups, which were comparable with regard to age and stage of disease. The effect of intravenous injections of 10 mg Valium®, of 50 mg UCB 1402, and of an infusion of a 0.8% solution of Distraneurin® was followed up by means of determinations of blood gases. The following results were obtained: — 1. Valium®, which caused a significant decrease of the EQ in a dose of 20 mg intramuscularly, brought about a significant increase of the arterial CO2-tension. — 2. Distraneurin®, which caused a similar, but not statistically significant, decrease of the EQ, brought about a significant increase of the arterial CO2-tension. — 3. UCB 1402, which had no influence upon the EQ, caused no significant increase of the arterial CO2-tension, though it has a sedative side effect. — The significance of these investigations and results for practical medical problems is discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular modeling 4 (1998), S. 12-32 
    ISSN: 0948-5023
    Keywords: Keywords Conducting polymers ; Nonlinear dynamics ; Solitons ; Polarons ; Electronic spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  Conjugated organic polymers are intrinsically semiconductors but become conducting upon doping and photoconducting after optical excitation. In the low doping regime they show usually conduction without an associated spin transport. Thus as charge carriers in this regime nonlinear quasiparticles are assumed, such as charged solitons in materials with a degenerate ground state like e.g. trans-polyacetylene or pernigraniline. In the case of materials with a non-degenerate ground state the situation is often less clear but it is assumed that charged polarons or bipolarons are the charge carriers in them. We present a theoretical model for the description of the dynamics of such quasiparticles which yields also information on their mobility, their nature and stability, as well as their spectral properties. The model is based on a π-electron Hamiltonian including electron-electron interactions. On the basis of the prototype material polyacetylene it is demonstrated how such a model can be parametrized with the help of correlated ab initio or density functional calculations and applied. We discuss in some detail the dynamics of the pristine material, as well as of doped and of electronically excited polyene chains. With the help of these dynamics a scenario for the conduction mechanism assumed for polyacetylene is given. Further we calculate optical spectra from the dynamics for charged solitons and for excited chains which are in fair agreement with experiments. The thermal mobility of neutral solitons is also studied. Further we show how the model can be extended for applications to polymers different from polyacetylene. Such modifications could yield informations about the nature of nonlinear quasiparticles involved in the process of charge transport in cases where the question is not completely solved. This is the case in cis-polyacetylene where recent literature suggests that bipolarons should be instable. However, we could show that both charged polarons and bipolarons are stable in the material with bipolarons favored over charged polarons. Due to the fact that the model can be extended to other polymers, also to chemical stuctures not yet synthesized, it could gain also predictive power after further development.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Informatik, Forschung und Entwicklung 10 (1995), S. 216-219 
    ISSN: 0949-2925
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5976-5978 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The combination of vibrational overtone excitation with time-resolved laser induced fluorescence detection of the excited molecule permits the study of collisional energy transfer in highly vibrationally excited molecules with single quantum state resolution. We apply this new technique to aceytlene excited in the region of the second CH stretching overtone transition (3νCH) (εvib =9640 cm−1) and probed via the A˜ electronic state. Our results show that self-relaxation proceeds at essentially the gas kinetic collision rate while quenching by the rare gases He, Ar, and Xe is only about a factor of two slower. The insensitivity of the relaxation rate to the structure of the collision partner clearly points to rotational relaxation or intramolecular vibrational energy transfer as the mechanism for collisionally depopulating the initially prepared state.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 10049-10057 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The relationship between the bulk density and pressure of configurations corresponding to local minima on the potential energy surface of molecular models of ethane, n-pentane, and cyclopentane (the equation of state of their energy landscape) has been explored. Like simpler, atomic fluids, these systems exhibit a limiting bulk density below which minimum energy configurations are no longer spatially homogeneous, but consist instead of a locally dense fraction and large, system-spanning voids. In the case of n-pentane, the sampling of the minima on the energy landscape was found to depend strongly on temperature, due to changing Boltzmann factors associated with the different conformers in the liquid. The pressures of the minimum energy configurations, in contrast, were found to be essentially independent of the liquid temperature in all cases. The highest amount of isotropic tension (negative pressure) that minimum energy configurations can sustain is reached at the limiting densities, and is of similar magnitude (approximately 250 MPa) for all three model substances. Crystalline configurations of ethane and n-pentane, in contrast, were found to exhibit higher isotropic tensile strength than their amorphous counterparts. A pronounced segregation of end groups on the boundary of large voids was observed in the minimum energy configurations of low bulk density pentane. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 78 (1991), S. 0 
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A method is described for the rapid isolation of the activated murein precursors UDP-N-acetylmuramyl-pentapeptide (UDP-MurNAc-pentapeptide) and UDP-MurNAc-tripeptide from Bacillus cereus. After accumulation of the precursors by inhibition of murein synthesis either in the presence of vancomycin (for the pentapeptide precursor) or d-cycloserine (for the tripeptide precursor) the cells were extracted with boiling water. Prior to high pressure liquid chromatography the material was freed from acid precipitable material. UDP-MurNAc-penta- and tripeptide were separated from other components by reversed-phase HPLC on Hypersil ODS using isocratic elution conditions with sodium phosphate buffer. The precursors were obtained with at least 98% purity and a yield of about 50 μmol from a 10–1 culture of B. cereus.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...