Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
Filter
  • Articles: DFG German National Licenses  (11)
  • 1995-1999
  • 1990-1994  (11)
  • 1993  (11)
  • 1
    Electronic Resource
    Electronic Resource
    Observation of cavity effect on spontaneous emission lifetime in AlGaAs quantum microcavities using continuous tuning of emission wavelength (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2944-2946 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Cavity effect on spontaneous emission lifetime has been observed through the continuous tuning of the emission wavelength by quantum confined Stark effect in AlGaAs Fabry–Perot microcavities. The obtained emission wavelength dependence of the exciton lifetime shows that the lifetime increases with the emission wavelength, specifically indicating a sharp increase at the cavity resonant wavelength. This behavior agrees well with the theoretical prediction based on the theoretical model of G. Björk, S. Machida, Y. Yamamoto, and K. Igeta [Phys. Rev. A 44, 669 (1991)]. Furthermore, we have also investigated the emission wavelength dependence of the transfer efficiency and obtained good agreement with the theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110280
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A synchrotron radiation study of potassium zinc fluoride perovskite (1993)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 632-636 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768193002666
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    X-ray analysis of wavefunctions by the least-squares method incorporating orthonormality. II. Ground state of the Cu2+ ion of bis(1,5-diazacyclooctane)copper(II) nitrate in a low-symmetry crystal field (1993)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 1001-1010 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768193007657
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    A new micromechanical formulation of martensite kinetics driven by temperature and/or stress (1993)
    Springer
    Archive of applied mechanics 63 (1993), S. 522-533 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Es wird das Verhalten der martensitischen Umwandlung von Legierungen unter beliebiger thermischer und/oder dreiachsiger mechanischer Spannungsbelastung untersucht, indem eine neue Gleichung der Umwandlungskinetik gelöst wird. Diese Gleichung wurde vor kurzem von denselben Autoren vorgestellt. Die numerischen und die analytischen Lösungen zeigen, daß das Transformationsverhalten nahezu pfadunabhängig ist. Die Linien gleicher Volumsfraktion von Martensit sind nahezu parallel im Spannungs-Temperatur-Diagramm. Es werden auch einige neue analytische Formeln für die Umwandlungskinetik von Martensit präsentiert.
    Notes: Summary Martensitic transformation behavior of alloys is studied under the arbitrary action of a thermal and/or a triaxial mechanical load-stress state by solving a transformation kinetic equation presented recently by the same authors. Numerical and analytical solutions reveal that the transformation behavior is almost path-independent. Lines of constant volume fraction of martensite are nearly parallel in the stress-temperature plane. Some new analytical formulae for martensitic transformation kinetics are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00804754
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Arteriovenous malformation and diaschisis (1993)
    Springer
    Acta neurochirurgica 120 (1993), S. 26-32 
    Details
    ISSN: 0942-0940
    Keywords: Arteriovenous malformation ; basal ganglia ; cerebral blood flow ; diaschisis ; thalamus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We investigated the haemodynamic dysfunction and secondary thalamic and brainstem atrophy in 24 patients with angiographically proven cerebral arteriovenous malformations (AVM) and no clinical history of cerebral haemorrhage. Cerebral blood flow (CBF) was measured by the method using either stable Xenon or single photon emission computerized tomography (SPECT). Morphological changes in the thalamus and brainstem were evaluated by magnetic resonance imaging (MRI). Two factors are considered to influence hypoperfusion in the ipsilateral cerebral and contralateral cerebellar hemisphere and secondary atrophy of the thalamus and brainstem. One is the size of the nidus and the other is the involvement of the basal ganglia. It is presumed that continuous haemodynamic stress over a long period of time may cause irreversible histological changes in areas remote from the lesion, especially in the AVM which demonstrates involvement of the basal ganglia or a large nidus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02001465
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Effect of cytochalasin A on actin distribution in the fission yeastSchizosaccharomyces pombe studied by fluorescent and electron microscopy (1993)
    Springer
    Protoplasma 176 (1993), S. 24-32 
    Details
    ISSN: 1615-6102
    Keywords: Actin ; Cytoskeleton ; Schizosaccharomyces pombe ; Freeze substitution ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Actin distribution and ultrastructure of the fission yeastSchizosaccharomyces pombe treated with cytochalasin A (CA) were investigated by fluorescence microscopy using rhodamine-conjugated phalloidin (rh-ph) and freeze substitution electron microscopy. Among the cytochalasins tested, CA was most effective and at 5 μg/ ml inhibited the appearance of the actin ring at the cell equator at the stage prior to septum formation and the accumulation of actin dots at the septum-forming site both in wild-type cells and the mutantcdc 11, which is defective in septum formation at restrictive temperature. Freeze substitution electron microscopy of CA-treated cells revealed the displacement and morphological alteration of cytoplasmic vesicles and dictyosomes within 30 min and the appearance of dense bodies in the cytoplasm. A sub-population of cytoplasmic vesicles and dictyosomes were insensitive to CA and maintained their original structure. An electron less dense layer containing filamentous material was noted beneath the plasma membrane and thought to be the area of heavy actin patches stained with rh-ph at the cells ends. These results suggest that CA disrupted an actin network that normally maintains the organization of the secretory pathway involving dictyosomes and vesicles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378936
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    High detection rates of cryptococcal antigen in pulmonary cryptococcosis by Eiken Latex Agglutination test with pronase pretreatment (1993)
    Springer
    Mycopathologia 123 (1993), S. 75-79 
    Details
    ISSN: 1573-0832
    Keywords: Antigen detection ; Capsular polysaccharide ; Cryptococcus neoformans ; Latex agglutination assay ; Pulmonary cryptococcosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Two different kits for the detection of serum cryptococcal antigen in patients with pulmonary cryptococcosis were evaluated. The Eiken test (the Eiken Co., Tokyo), which uses pronase for pretreatment of serum, was compared with the Crypto-LA test (International Biological Laboratories, Cranbury, NJ), which did not use pronase prior to testing. Cryptococcal antigen was detected in 21 of 23 patients (91%) with the Eiken test and in only 10 of 23 patients (43%) with the Crypto-LA test (p〈0.01 by Mcnemar test). However, the sensitivity of two tests was identical without use of pronase, as both tests could detect as little as 104 cells/ml ofCryptococcus neoformans and 10 ng/ml of capsular polysaccharide ofC. neoformans. In those serum specimens for which both tests were positive, titers were much higher for the Eiken test, but there was a statistically significant correlation between the two tests (coefficient correlation 0.79,p〈0.01). Cryptococcal antigen titer levels measured by the Eiken test correlated well with clinical courses. There was one false-positive reaction among 82 sera of non-cryptococcal patients. Pronase enhanced the sensitivity of the Eiken test, which appeared to be useful in patients with pulmonary cryptococcal disease, and its use may prevent unneeded lung biopsies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01365083
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Regional changes in neuropeptide levels after 5,7-dihydroxytryptamine-induced serotonin depletion in the rat brain (1993)
    Springer
    Journal of neural transmission 92 (1993), S. 151-157 
    Details
    ISSN: 1435-1463
    Keywords: Neuropeptide ; serotonin depletion ; 5,7-dihydroxytryptamine (5,7-DHT)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The levels of five neuropeptides (substance-P, somatostatin, cholecystokinin octapeptide, methionin-enkephalin and dynorphin) were examined in the brain and the spinal cord of rats 2 weeks after intracerebroventricular injection of 5,7-dihydroxytryptamine (5,7-DHT). 5,7-DHT injection caused a significant reduction of the serotonin level in all regions of the brain. The level of each neuropeptide except dynorphin significantly increased in specific regions of the brain after 5,7-DHT treatment without any decrease in their levels in any region. Since, coexistence and interaction between classical neurotransmitters and neuropeptides in the same neurons have been reported, both are indispensable for evaluating pathophysiological state of the brain function associated with abnormal neural transmission. The present findings together with previous reports suggest that neuropeptides act as neurotransmitters and compensate for the impaired function of the serotonergic systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244874
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Cold adaptation of the terrestrial isopod, Porcellio scaber, to subnivean environments (1993)
    Springer
    Journal of comparative physiology 163 (1993), S. 439-444 
    Details
    ISSN: 1432-136X
    Keywords: Supercooling point ; Lower lethal temperature ; Cryoprotectants ; Gut contents ; Isopod, Porcellio scaber
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The terrestrial isopod, Porcellio scaber, was susceptible to subzero temperature: both freezing and chilling were injurious. The level of cold hardiness against chilling and freezing showed different patterns in their seasonal variation. The lower lethal temperature causing 50% mortality, an indicator of the tolerance to chilling, ranged from-1.37°C in August to-4.58°C in December. The whole body supercooling point, the absolute limit of freeze avoidance, was kept at about-7°C throughout the year. The winter decrease in lower lethal temperature was concomitant with an accumulation of low molecular weight carbohydrates which are possible protective reagents against chilling injury, whereas the less seasonally variable supercooling point seemed to be associated with the year-round presence of gut content. Food derivatives may act as efficient ice nucleators. The different trend in seasonal changes between lower lethal temperature and supercooling point may be related to the microclimate of the hibernacula in subnivean environments, where the winter temperature became lower than the lower lethal temperature in the summer active phase, but remained higher than the summer supercooling point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346927
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Immunohistological observations on pulmonary tissues from dogs infected withDirofilaria immitis (1993)
    Springer
    Veterinary research communications 17 (1993), S. 109-117 
    Details
    ISSN: 1573-7446
    Keywords: Dirofilaria immitis ; dog ; immunohistology ; lung ; peroxidase-antiperoxidase staining
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Pulmonary tissues from non-infected dogs, naturallyDirofilaria immitis-infected dogs and experimentally infected puppies, selectively necropsied after infection, were assessed using peroxidase-antiperoxidase (PAP) staining technology. Sequential sections of pulmonary tissue were PAP stained with anti-freshD. immitis serum, anti-paraffin processedD. immitis serum, anti-dog immunoglobulin (IgG, IgG Fc, IgM) sera and anti-dog complement (C3) serum, and examined for antibody, complement and forD. immitis antigen. The extent of alveolar septal thickening was positively correlated with infection status. Cellular infiltration was most evident surrounding obstructed areas whereD. immitis werein situ. Antigenic material (microfilariae, eggs, fragmented filariae) labelled by PAP was identified in the pulmonary arteries, alveolar capillaries and alveolar septa. Deposits of complement and IgG, presumably associated with immune complex formation, were also observed in some of the infected dogs. Identification of antigen, antibodies and complement associated with alveolar septal pathology suggested that immune mechanisms were active in its development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01839238
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...