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
  • 1
    Electronic Resource
    Electronic Resource
    Determination of temperature dependence of GaSb absorption edge and its application for transmission thermometry (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6632-6635 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transmission spectra of GaSb have been obtained over a temperature range from 10 to 470 °C. Using this information, transmission thermometry is applied to obtain accurate measurements of sample temperature during molecular beam epitaxy growth on GaSb substrates. A GaSb surface reconstruction transition is determined as a function of Sb flux and substrate temperature, establishing a laboratory-independent temperature standard. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370290
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Infrared dielectric constant of cubic SiC (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 7255-7258 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The real dielectric constant for chemical vapor deposition 3C-SiC grown on silicon (Si) has been determined at 300 K and at 5 K from an analytic fit to interference fringes in transmission over the spectral range from the near infrared to the submillimeter region. This technique is capable of high accuracy being limited typically by the sample thickness and accuracy with which the thickness is measured. The resulting real dielectric constant is lower than the values usually attributed to this material. We find: at 300 K ε 0=9.52 and ε ∞=6.38; at 5 K ε0=9.28 and ε ∞=6.22. In all cases the estimated error is ±0.8%. The observed ratio ε0 /ε∞ agrees with the Lyddane–Sachs–Teller relation to 0.1% at 300 K and 0.2% at 5 K. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360438
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Infrared dielectric constant of gallium arsenide (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6939-6942 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The real dielectric constant of gallium arsenide has been determined at 300 and at 5 K from fits to observed interference in transmission of thin samples with parallel surfaces. Measurement was carried out over all or part of the range 30–4000 cm−1. An accuracy of ±0.5% is estimated based on the quality of the analytic fits and the sample thickness measurement technique. We find at 300 K, ε0=12.90 and ε∞=10.86. At 5 K, ε0=12.46 and ε∞=10.58. An analytic expression for the dielectric function is given which allows accurate values of the real dielectric constant to be determined throughout most of the 0–4000 cm−1 spectral range. The observed ratio ε0/ε∞ agrees with the Lyddane–Sachs–Teller relation calculated with Raman values of transverse and longitudinal optical phonon frequencies to better than 0.1% at 300 and at 5 K. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363818
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Erratum: Infrared dielectric constant of gallium arsenide [J. Appl. Phys. 80, 6939 (1996)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3732-3732 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365497
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Optimum growth parameters for type-II infrared lasers (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 1796-1799 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The surface, structural, and optical properties of InAs/InGaSb/AlSb mid-infrared lasers grown by molecular beam epitaxy have been systematically studied, respectively, by Nomarski differential interference contrast, high-resolution x-ray diffraction, and variable-temperature photoluminescence. It is found that the optimum growth temperature is between 400 and 450 °C, based on the calibrated transmission thermometry. In addition, the impact of interfacial bond type and Sb sources has been investigated. A 5.91 μm laser, grown with the optimal growth parameters, exhibits a maximum cw operating temperature of 210 K. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370971
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    THE HALF-LIFE OF ACETYLCHOLINESTERASE IN MATURE RAT BRAIN (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 22 (1974), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: —The rate of degradation of acetylcholinesterase [EC 3.1.1.7] in mature rat cerebral cortex was determined from the time course of the label introduced into the protein by one intraventricular injection of l-leucine-l-14C. The half life of the enzyme was 2.84 ± 013 days.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1974.tb04319.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    ISOLATION AND PARTIAL CHARACTERIZATION OF RAT BRAIN SYNAPTIC PLASMA MEMBRANES (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 22 (1974), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— Synaptic plasma membranes from the cortices of adult rat brain were isolated from synaptosomes prepared by flotation of a washed mitochondrial pellet (P2) in a discontinuous Ficoll-sucrose gradient. Contamination of the synaptosome fraction by microsomes was estimated by enzymic and chemical analysis to be less than 15 per cent. (2) The purified synaptosome fraction was subjected to osmotic shock, subfractionated on a discontinuous sucrose gradient and the distribution of enzymic and chemical markers for synaptic plasma membranes, microsomal membranes and mitochondria was determined. (3) Comparison of synaptosome subfractions prepared in the presence and absence of 1 mM NaH2 PO4/0.1 mM EDTA buffer pH 7.5, indicated that the ionic composition of the isolation medium markedly affected the distribution and enzymic composition of the subfractions. (4) Synaptic plasma membranes prepared in the presence of PO4/EDTA exhibited a 10-fold enrichment in [Na++ K+] ATPase and were characterized by less than 15 and 10 per cent contamination by microsomes and mitochondria respectively. (5) The polypeptide composition of the purified synaptic plasma membranes was compared with the microsomes and mitochondria by polyacrylamide gel electrophoresis in sodium dodecyl sulphate. No differences between the protein and glycoprotein composition of the synaptic plasma membranes and microsomes were detected. The mitochondria, in contrast, possessed a unique protein composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1974.tb11591.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    THE DISTRIBUTION OF SYNAPTOSOMAL OXIDATIVE ENZYMES AFTER EXPOSURE TO DEOXYCHOLATE (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 17 (1970), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— The distributions of NADH2 dehydrogenase, NADH, cytochrome c reductase and cytochrome oxidase have been determined utilizing synaptosomal isolation techniques. Deoxycholate was used to determine compartmentation and/or ‘latency’ of these activities. NADPH, dehydrogenase proved to be a soluble and mitochondrial enzyme and the activity of this enzyme was not appreciably changed by deoxycholate treatment. NADHg cytochrome c reductase proved to be a mitochondrial enzyme with considerable activity in microsomal fractions. Deoxycholate treatment increased activity in the synaptosomal fraction 8.3-fold. A bimodal activation pattern was observed with synaptosomal and mitochondrial NADH, cyrochrome c reductase upon exposure to increasing concentrations of deoxycholate, with enhancement of activity at 0.25 % (w/v) and 0.50 % (w/v) deoxycholate. The enzyme was stable at concentrations of deoxycholate less than 0.25% (w/v) but was irreversibly inactivated at concentrations higher than 0.25% (w/v). The mechanism of this activation pattern appeared to be a combination of enzyme release and inactivation. Similar results were not observed in liver mitochondria.Cytochrome oxidase, a known mitochondrial marker, exhibited a 17-fold increase in synaptosomal activity with deoxycholate treatment. The synaptosomal cytochrome oxidase activity after deoxycholate treatment approached the activity in the free mitochondrial fraction. The percentage of mitochondrial protein in synaptosomal fractions was estimated to be about 30 per cent from a comparison of the respective total (deoxycholate-treated) activities. On the basis of these data we suggest that the synaptosomal fraction possesses a relatively sizable energy-producing potential which may be of significance in vivo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1970.tb11391.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    PROTEIN SYNTHESIS IN VISUAL CELLS OF LIMULUS (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 17 (1970), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— The incorporation of l-[4,5-3H]leucine into the primary visual cells of lateral eyes of Xiphusura polyphemus (Limulus) was followed by electron microscopic radio-autography, while protein synthesis in the tissue surrounding the primary cells was measured by scintillation counting of the extracted protein. In the primary cells, the incorporation of radioactivity during 24 h into the rhabdomal membranes was 10–20 times greater in dark than in light, and was especially high in eyes that had been exposed to light before a period of incorporation in the dark. In tissue adjacent to the primary cells, protein synthesis was about 50 per cent greater in eyes exposed to light. These results are interpreted in terms of the photochemistry of Limulus rhodopsin and the competition for ATP between sodium-pump and protein-synthetic mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1970.tb00516.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    PROPERTIES OF ACETYLCHOLINESTERASE FROM RAT BRAIN (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 22 (1974), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: —Acetylcholinesterase (EC 3.1.1.7) from cerebral cortex of mature rats was purified by means of affinity chromatography, to a specific activity of 4.5 mmol acetylthiocholine hydrolysed × min−1× mg−1 protein. The enzyme is a glycoprotein and contains a single subunit with a mol. wt of about 80,000. Electrofocusing either a pure or a crude preparation of the enzyme produces six enzymatically active bands with a range of isoelectric points from 5.04 to 5.54. Gel filtration yields oligomers with molecular weights of about 150,000, 320,000, 500,000 and 650,000, with 60 per cent of the activity in the 150,000 fraction. The gel fractions with molecular weights 150,000 and 320,000 produce the same isoelectric patterns. Different subcellular fractions of the cortex show different characteristic isoenzyme patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1974.tb04320.x
    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...