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  • 1990-1994  (51)
  • 1985-1989  (26)
  • 1975-1979  (34)
  • 1
    Electronic Resource
    Electronic Resource
    Giant nonlinear optical rectification at 8–12 μm in asymmetric coupled quantum wells (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1822-1824 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report giant, nonlinear optical rectification in asymmetric quantum wells weakly coupled by an intermediate potential barrier. This phenomenon originates from (i) macroscopic displacements (30 nm) of carriers during optical transitions and (ii) large storage times of excited electrons because of a slow transfer mechanism between the wells (≈6 ps at 77 K). The resulting rectification coefficient is 1.62×10−3 m/V per well, more than six orders of magnitude higher than in bulk GaAs. These structures really behave as giant "quasimolecules'' optimized for infrared optical nonlinearities and their use may be envisioned for a new class of infrared detectors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103081
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  • 2
    Electronic Resource
    Electronic Resource
    Mirrorless all-optical bistability in bacteriorhodopsin (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 1489-1491 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report direct observations of all-optical mirrorless bistability associated with saturable absorption in three kinds of bacteriorhodopsin (BR) samples: wild-type BR in water solution and dispersed in thin films of a polymer matrix as well as water solution of the genetically engineered mutant BRD96N. The experiments are carried out with picosecond pulses at 532 nm. The values measured for the saturation intensity are explained in terms of the relaxation of the excited M state population to the B state of the BR photocycle for the three kinds of samples studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109665
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of Amylose Derivatives Selectively Modified at C-6. 6-Amino-6-deoxyamylose (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 2917-2922 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00089a004
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  • 4
    Electronic Resource
    Electronic Resource
    Progress in Electroweak Baryogenesis (1993)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 43 (1993), S. 27-70 
    Details
    ISSN: 0163-8998
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ns.43.120193.000331
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  • 5
    Electronic Resource
    Electronic Resource
    Oncogenes and Phosphatidylinositol Turnover (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 488 (1986), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1986.tb54426.x
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  • 6
    Electronic Resource
    Electronic Resource
    Humoral autoimmune response in Chagas' disease: Trypanosoma cruzi ribosomal antigens as immunizing agents (1993)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS immunology and medical microbiology 7 (1993), S. 0 
    Details
    ISSN: 1574-695X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract Molecular expression cloning techniques have revealed that patients with chronic Chagas' heart disease (cChHD) present a strong humoral response against the cloned C-terminal portions of the four Trypanosoma cruzi ribosomal P proteins TcP1, TcP2α (TcP2b), TcP2β (TcPJL5), and TcP0. This protein family presents several features that may be important in the immunopathology of Chagas disease. Their exposed location on the ribosome, and the amplification of their parasite-specific, Ser free C-terminal domain, generate a strong anti-parasite P response that may induce anti-P autoimmunity. Evidences indicate that the serological pattern of the anti-P response from chagasic patients may be the consequence of a chronic immunization with T. cruzi ribosomal antigens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-695X.1993.tb00400.x
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  • 7
    Electronic Resource
    Electronic Resource
    Control of molecular weight distribution of the biopolymer pullulan produced byAureobasidium pullulans (1993)
    Springer
    Journal of polymers and the environment 1 (1993), S. 3-9 
    Details
    ISSN: 1572-8900
    Keywords: Biopolymer ; pullulan ; polysaccharide ; molecular weight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of carbon, nitrogen, and phosphate source, along with concentration, was determined for effect on the weight average molecular weight, molecular weight distribution, and yield of pullulan produced byAureobasidium pullulans NRRL-Y 6220. Batch systems, scale-up batch, and continuous fermentations of 1 L and 10 L were also evaluated as were processing variables, including solvents, and extraction conditions. Products with weight average molecular weight from 1.0 × 105 to 4.0 × 106 were produced in 100-g quantities by varying fermentation conditions such as constituents of the culture medium, pH, and length of incubation. Three sets of culture conditions were defined for the formation of low (〈5.0×105), medium (1.0–2.0×106), and high (〉2.0×106) weight average molecular weight polymer. These defined molecular weight fractions of pullulan were used in further studies in producing films and fibers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01457648
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  • 8
    Electronic Resource
    Electronic Resource
    Nitrite activation of nitrate reductase in higher plants (1978)
    Springer
    Planta 138 (1978), S. 205-209 
    Details
    ISSN: 1432-2048
    Keywords: Hordeum Nitrite ; Nitrate reductase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Comparative studies of nitrate-activated nitrate reductase (NR-NO2) and nitrate-induced nitrate reductase (NR-NO3) (EC 1.6.6.2) indicate that the enzymes differ in structure, heat stability, and pH dependence, but have the same cofactor requirment. NR-NO2 developes in barley (Hordeum vulgare L. var. Dvir) seedlings as NR-NO3 disappears. A transition from the active to the inactive form of nitrate reductase takes place. Nitrite seems to activate the inactive form of the enzyme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386812
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  • 9
    Electronic Resource
    Electronic Resource
    Phytoavailability and toxicity of beryllium and vanadium (1990)
    Springer
    Water, air & soil pollution 53 (1990), S. 203-212 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Greenhouse and laboratory studies were conducted to evaluate the toxic effects of Be and V on collards (Brassica oleracea, var. acephala L.). In the laboratory germination study, incremental increases in the Be concentrations of the growing medium induced a steady decline in the radicle length of seven-day-old collard seedling. Beryllium concentrations greater than or equal to 8 mg Be L−1 totally inhibited seed germination. The presence of V in the growing medium had no effect on collard germination; however, it had a profound effect on subsequent radicle elongation. Concentrations of V less than 1 mg V L−1 stimulated radicle elongation, while concentrations greater than or equal to 3 mg V L−1 caused severe toxicity. In the greenhouse study, Be toxicity was observed in collards grown in a Blanton sand (Grossarenic Paleudult) received treatments greater than or equal to 150 mg Be kg −1 (as BeSO4). Irrespective of treatment level, 97% of the Be taken up by the plants remained in the roots while only 3% was translocated to aboveground plant parts. Vanadium tissue concentrations and toxicity to collards varied with soil type. Additions as low as 80 mg V kg−1 to the Blanton sand significantly reduced collard biomass while additions as high as 100 mg V kg−1 to an Orangebury loamy sand (Typic Paleudult) had no effect on plant biomass. The differential response was attributed to greater accumulation of V by plants grown in the Blanton soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170737
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  • 10
    Electronic Resource
    Electronic Resource
    Genetic diversity and environmental associations of wild barley,Hordeum spontaneum (Poaceae), in Iran (1986)
    Springer
    Plant systematics and evolution 153 (1986), S. 141-164 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Poaceae ; Hordeum spontaneum ; Genetic resources ; allozyme polymorphism ; correlation with environmental parameters ; Flora of Iran
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Genetic diversity and structure of populations of the wild progenitor of barleyHordeum spontaneum in Iran was studied by electrophoretically discernible allozymic variation in proteins encoded by 30 gene loci in 509 individuals representing 13 populations of wild barley. The results indicate that: a)Hordeum spontaneum in Iran is extremely rich genetically but, because of predominant self-pollination, the variation is carried primarily by different homozygotes in the population. Thus, genetic indices of polymorphismP-1% = 0.375, range = 0.267−0.500, and of genetic diversity,He = 0.134, range = 0.069−0.198, are very high. b) Genetic differentiation of populations includes clinal, regional and local patterns, sometimes displaying sharp geographic differentiation over short distances. The average relative differentiation among populations isGst = 0.28, range = 0.02−0.61. c) A substantial portion of the patterns of allozyme variation in the wild gene pool is significanctly correlated with the environment and is predictable ecologically, chiefly by combinations of temperature and humidity variables. d) The natural populations studied, on the average, are more variable than two composite crosses, and more variable than indigenous land races of cultivated barely,Hordeum vulgare, in Iran. — The spatial patterns and environmental correlates and predictors of genetic variation ofH. spontaneum in Iran indicate that genetic variation in wild barley populations is not only rich but also at least partly adaptive. Therefore, a much fuller exploitation of these genetic resources by breeding for disease resistance and economically important agronomic traits is warranted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983683
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