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
Filter
  • 1995-1999  (3)
  • 1985-1989  (6)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 724-726 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have successfully passivated the surface of n-type (100) GaAs on the basis of P2S5/NH4OH treatment of the surface. A fivefold increase in the photoluminescence (PL) intensity results at room temperature when the surface is passivated and the PL intensity remains the same even after ten days' exposure to room air. Current-voltage characteristic also corroborates the PL measurements and shows that the GaAs surface retains its integrity when passivated with P2S5 and its electronic characteristic remains invariant with time even after exposure to air for one month. The results are indications of the robust stability of the passivated GaAs surface.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 2823-2825 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The crystallization of amorphous BaxSr1−xTiO3 (BST) thin films was studied in a synchrotron x-ray scattering experiment. In a 550 Å thick film, the crystallization to perovskite phase was occurred at around 700 °C, while a 5500 Å thick film became crystalline at 500 °C. The thickness dependence of the crystallization was attributed to the observed intermediate phase nucleated near 600 °C at the interface. In thin films, high annealing temperature was required due to the energy barrier between the perovskite phase and the intermediate phase. In the thick film, the perovskite phase was nucleated directly from the amorphous phase in the bulk of the film concurrent to the nucleation of the intermediate phase at the interface. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2187-2189 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of growth temperature on the microscopic structure of GaN nucleation layers were studied in a synchrotron x-ray scattering experiment. As the growth temperature increases from 467 to 655 °C, the stacking of GaN changes from random stacking to a mixture of cubic and hexagonal stacking. With increasing the growth temperature, the order in the atomic layer positions in the out-of-plane direction increases and the mosaic distribution becomes narrow. The optimal photoluminescence spectrum was obtained on the GaN epilayer deposited on the nucleation layer grown at 505 °C. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Congenital adrenal hyperplasia (CAH) is a common autosomal recessive disorder mainly caused by defects in the steroid 21-hydroxylase (CYP21) gene. We have analyzed CYP21 gene sequences in 65 CAH families in Taiwan. All ten exons of the CYP21 gene were analyzed by differential polymerase chain reaction followed by single-strand conformation polymorphism electrophoresis and the amplification-created restriction site method. About 95% (123 chromosomes) contain mutations due to conversion of DNA sequences into its neighboring homologous pseudogene, CYP21P. Four novel mutations representing 5% of the total chromosomes have also been identified. The mutations were confirmed by sequencing an aberrant DNA fragment. These four mutations included a base change of the splicing donor site at intron 2 from GT to AT, a base substitution of C to T at codon 316, deletion of ten bases (TCCAGCTCCC) at codons 330–333 of exon 8, and duplication of 16 bases (CCTGGATGACACGGTC) at codons 393–397 of exon 9. The loss of the splicing donor site at intron 2 and the premature stop at codon 316 may result in aberrant splicing to reduce enzyme activity and a truncated protein with no enzyme activity, respectively. Likewise, both the duplication and the deletion forms create a frameshift and premature stop during translation. The resulting proteins lack the heme-binding domain and hence are expected to lose enzymatic activity. Since these mutations are not found in the neighboring CYP21P pseudogene, gene conversion should not be the cause of these novel mutations.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Infection 15 (1987), S. 232-236 
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Auf der Suche nach diagnostisch verwertbaren klinischen Befunden und Laborwerten für die Früherfassung der spontanen bakteriellen Peritonitis wurden zwei Patientengruppen mit chronischer Lebererkrankung und Aszites identifiziert: 1.) 38 Patienten, bei denen 40 Episoden einer spontanen bakteriellen Peritonitis aufgetreten waren und 2.) 39 zufallsgemäß ausgewählte Patienten, bei denen 40mal durch Parazentese steriler Aszites gewonnen wurde, und die bei vergleichbar schwerer Leberfunktionsstörung als Referenzgruppe geeignet waren. Wir untersuchten eine Vielzahl klinischer und Laborparameter. In der Patientengruppe mit spontaner bakterieller Peritonitis fand sich im Mittel eine gegenüber der Referenzgruppe geringere absolute Lymphozytenzahl im peripheren Blut (Mittelwert: 703/mm3 im Vergleich zu 1.212/mm3, p〈0,005. Mit vier Laborparametern aus dem Aszites, das heißt einer Leukozytenzahl von ≥ 300/mm3, einer Granulozytenzahl von ≥ 240/mm3, einem Aszites/Serum-LDH-Quotienten von ≥ 0,4 und einem Aszites/Serum-Glukose-Quotienten von ≤ 1,0 war eine Unterscheidung zwischen spontaner bakterieller Peritonitis und der Referenzgruppe bei einer Sensitivität und Spezifität von 〉 70% möglich. Obwohl die Gesamtleukozytenzahl und Granulozytenzahl im Aszites brauchbare Hinweise für eine Frühdiagnose der spontanen bakteriellen Peritonitis liefern, muß die Möglichkeit falsch positiver Befunde bedacht werden. Die kombinierte Anwendung mehrerer Untersuchungsverfahren einschließlich der Bestimmung der Aszites/Serum-LDH- und Glukose-Quotienten erreicht einen besseren positiven prädiktiven Wert als die Anwendung eines einzelnen diagnostischen Verfahrens.
    Notes: Summary In a search for clinical and laboratory factors that would aid in early diagnosis of spontaneous bacterial peritonitis, we identified two groups of patients with chronic liver disease and ascites: 1) 38 patients with 40 episodes of spontaneous bacterial peritonitis, and 2) 39 randomly selected patients with 40 sterile paracenteses who were matched for severity of liver dysfunction as a reference group. A variety of clinical and laboratory features were examined. The absolute lymphocyte count in peripheral blood was lower for the spontaneous bacterial peritonitis group (mean=703/mm3 vs. 1,212/mm3, p〈0.005). Four ascitic fluid variables, i.e., a white blood cell count of ≥ 300/mm3, a polymorphonuclear leukocyte count of ≥ 240/mm3, an ascitic fluid/serum LDH ratio of ≥ 0.4, or an ascitic fluid/serum glucose ratio of ≤ 1.0, could separate the spontaneous bacterial peritonitis and reference groups with both sensitivity and specificity of 〉 70%. Although ascitic fluid total leucocyte and polymorphonuclear leucocyte counts are appropriate indicators for the early diagnosis of spontaneous bacterial peritonitis, the possibility of their false positivity should be warranted. The use of multiple tests including ascitic fluid/serum LDH and glucose ratios has better positive predictive value than a single test alone.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 33 (1987), S. 366-381 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The alternating flow model (AFM) views dispersion in packed beds as a sequence of streamline plugs that must repeatedly split and merge as the bulk fluid traverses the vessel. Thus, the flow in the AFM is ordered, as opposed to the random flow implied by the Fickian analogy. For mass dispersion only, model parameters arise from a priori considerations of packing geometry. Steady state and transient data (5.6 〈 Dt/dp 〈 54.4, 100 〈 Rep 〈 1,000, gases and liquids) show the AFM to surpass the Fickian analogy (based on correlations for dispersion coefficients) in most cases. Further, it can describe well the radial velocity profile trends in packed beds. For heat dispersion, two additional parameters (heat transfer coefficients) arise that are not functions of packing geometry. Simple correlations for these parameters and the justifications are given. Most of the comparisons made with the literature experimental results show the AFM to be at least as good as the back-fit Fickian analogy. The AFM should be most useful for packed beds with a relatively small Dt/dp.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 32 (1986), S. 309-312 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 31 (1985), S. 1939-1946 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Platinum supported on silica is used as a model supported catalyst for the purpose of demonstrating that the selective physisortion method yields the fractional catalyst surface area of supported catalysts, inclucing metal compounds catalysts for which the method is primarily intended. The selective physisorption results with nitrous oxide as adsorbate are compared with hydrogen chemisorption results for this purpose. Experimental and theoretical refinements of the method developed earlier in our laboratory are presented that allow rather accurate determination of the catalyst surface area. The refinements also make the method effctive even when the catalyst covers a small portion of the total surface area. Because of the nature of physisorption, the method should be applicable to any supported catalyst including metal compounds catalysts, provided a suitable adsorbate is used. Adsorbates other than nitrous oxide and carbon dioxide which are suitable for selective physisorption, are suggested.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Biotechnology letters 8 (1986), S. 853-858 
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A nuclear polyhedrosis virus ofHyphantria cunea replicated successfully in theTrichoplusia ni cell line. Restriction endonuclease analysis of the viral DNA obtained from infected cell culture showed the same general homogeneity as that from virus isolated from diseased host larvae. Electron microscopic observations showed that the occluded virus from cell culture consists of rod-like nucleocapsids (31×320 nm) enveloped in aggregates and embedded in polyhedral inclusion bodies from 0.6 to 2.5 μm in diameter.
    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...