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  • 1995-1999
  • 1990-1994  (36)
  • 1975-1979
  • 1970-1974  (5)
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  • 1940-1944
  • 1994  (17)
  • 1993  (19)
  • 1972  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Optically generated liquid crystal gratings (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2542-2544 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optically controlled planar orientation of liquid crystal molecules with polarized light is used to make phase gratings in liquid crystal media. The electro-optical properties of liquid crystal linear and chirped gratings are discussed. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112629
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  • 2
    Electronic Resource
    Electronic Resource
    Male pseudohermaphroditism caused by mutations of testicular 17β–hydroxysteroid dehydrogenase 3 (1994)
    [s.l.] : Nature Publishing Group
    Nature genetics 7 (1994), S. 34-39 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Defects in the conversion of androstenedione to testosterone in the fetal testes by the enzyme 17β–hydroxysteroid dehydrogenase (17β–HSD) give rise to genetic males with female external genitalia. We have used expression cloning to isolate cDNAs encoding a microsomal ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/ng0594-34
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  • 3
    Electronic Resource
    Electronic Resource
    Localization of Glyoxylate Cycle Enzymes in Glyoxysomes in Euglena (1972)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 19 (1972), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. We demonstrated previously microbodies in Euglena gracilis grown in the dark on 2-carbon substrates. We have now established in Euglena the particulate nature of enzymes known in other organisms to be localized in microbodies (glyoxysomes and leaf peroxisomes). On a linear sucrose gradient the glyoxylate cycle enzymes band together at a nigner equilibrium density (1.20 g/cm3) than mitochondrial marker enzymes (1.17 g/cm3), establishing the existence in Euglena of glyoxysomes similar to those of higher plants. Glyoxylate (hydroxypyruvate) reductase and, under certain conditions, also glycolate dehydrogenase co-band with the glyoxylate cycle enzymes, suggesting that Euglena glyoxysomes, like those of higher plants, may contain peroxisomal-type enzymes. Catalase, an enzyme characteristic of microbodies from a variety of sources, was not detected in Euglena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1972.tb03521.x
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  • 4
    Electronic Resource
    Electronic Resource
    Odour detection in bees (1993)
    [s.l.] : Nature Publishing Group
    Nature 362 (1993), S. 119-120 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR — Breed and Julian1 argue that data they obtained from controlled agonistic interactions of worker honey-bees "... suggest a system of ordering of priority of cues by the bees. . ." in the context of nestmate discrimination. This interpretation builds on the "hierarchy of importance of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/362119b0
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  • 5
    Electronic Resource
    Electronic Resource
    The occurrence of microbodies and peroxisomal enzymes in achlorophyllous leaves (1972)
    Springer
    Planta 105 (1972), S. 114-138 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Several types of leaves of leaf parts lacking chlorophyll were fixed and embedded according to conventional procedures and examined electron-microscopically for microbodies. Comparisons of relative abundance of microbodies, plastids and mitochondria were made by computing the average numbers of organelle profiles per cell section. Similar leaves were homogenized and assayed for three enzymes characteristic of leaf peroxisomes. The localization of these enzymes in microbodies was indicated for the achlorophyllous tissues by the positive result obtained when 3,3′-diaminobenzidine was used as an electron cytochemical stain for catalase activity. Microbodies were present in all non-photosynthetic leaves or leaf parts examined, including yellowish-white segments of variegated leaves, albino leaves, and etiolated leaves of two species. In several cases, the numbers of microbody profiles per cell section were as great in the achlorophyllous leaves as in the chlorophyllous. The levels of peroxisomal enzyme activity in the yellowish-white leaves were substantial, although often not as high as in the green leaves. It was concluded that enzymatically these microbodies are probably similar to the peroxisomes characterized from chlorophyllous leaves. In the absence of the photosynthetic product, glycolate, however, it seems unlikely that the organelle is performing the same functions as in green leaves. It is also apparent that the initial formation of peroxisomes in leaves can occur when neither light nor a photosynthate such as glycolate is present as an inducer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385572
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  • 6
    Electronic Resource
    Electronic Resource
    An inclusive fitness model for the evolutionary advantage of sibmating (1994)
    Springer
    Evolutionary ecology 8 (1994), S. 61-69 
    Details
    ISSN: 1573-8477
    Keywords: sibmating ; inbreeding depression ; haplodiploid ; inclusive fitness ; one-locus genetic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We construct an inclusive fitness model of the relative selective advantage of sibmating and outbreeding behaviour, under the assumption that inbred offspring pay a fitness penalty. We are particularly interested in the question of whether such inbreeding depression is enough to generate a stable phenotypic polymorphism, with both kinds of breeding observed. The model predicts that, under diploidy, such a polymorphism is never found, but under haplodiploidy, it exists for a narrow range of parameter values. The inclusive fitness argument is technically interesting because care must be taken with reproductive values. We also present a corrected version of a one-locus genetic model for sibmating and find that the inclusive fitness and genetic models give identical results when selection is weak.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01237666
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  • 7
    Electronic Resource
    Electronic Resource
    Boundary-layer depth and entrainment zone characterization with a boundary-layer profiler (1994)
    Springer
    Boundary layer meteorology 68 (1994), S. 375-385 
    Details
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A technique for determining the height of the convective atmospheric boundary layer (CBL) with a 915 MHz boundary-layer profiler is discussed. The results are compared with CBL heights determined from radiosonde measurements. The profiler provides continuous CBL height measurements with very good time resolution (30 minutes or less), allowing for detailed understanding of the growth and fluctuations of the CBL. In addition, the profiler provides information about the degree of definition of the CBL top and the thickness of the entrainment zone. The measurements discussed were taken during the Rural Oxidants in the Southern Environment II (ROSE II) experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00706797
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  • 8
    Electronic Resource
    Electronic Resource
    The Student Integration Survey: Development of an early alert assessment and reporting system (1993)
    Springer
    Research in higher education 34 (1993), S. 513-531 
    Details
    ISSN: 1573-188X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract This study describes efforts to develop a self-report rating scale (Student Integration Survey: SIS) that provides diagnostic information about students with academic and/or social integration difficulties. Data obtained from administration of the SIS to incoming freshmen at a postsecondary technical institution for the deaf in the fall of 1990 and 1991 were subjected to Rasch rating scale analysis. Fit of data to the measurement model resulted in a set of 28 positive and negative statements that empirically defined the concept of “institutional integration” in terms of their calibration hierarchy. This type of instrument calibration has the potential of providing person measures and item scale values that are invariant over a useful range of comparisons. The early alert reporting system provides an evaluation and diagnosis of observed responses relevant to expected responses for individual respondees. The substance and methods employed may provide a model for other integration assessment efforts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00991858
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  • 9
    Electronic Resource
    Electronic Resource
    The global oscillation network group site survey (1994)
    Springer
    Solar physics 152 (1994), S. 351-379 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Global Oscillation Network Group (GONG) Project will place a network of instruments around the world to observe solar oscillations as continuously as possible for three years. The Project has now chosen the six network sites based on analysis of survey data from fifteen sites around the world. The chosen sites are: Big Bear Solar Observatory, California; Mauna Loa Solar Observatory, Hawaii; Learmonth Solar Observatory, Australia; Udaipur Solar Observatory, India; Observatorio del Teide, Tenerife; and Cerro Tololo Interamerican Observatory, Chile. Total solar intensity at each site yields information on local cloud cover, extinction coefficient, and transparency fluctuations. In addition, the performance of 192 reasonable components analysis. An accompanying paper describes the analysis methods in detail; here we present the results of both the network and individual site analyses. The selected network has a duty cycle of 93.3%, in good agreement with numerical simulations. The power spectrum of the network observing window shows a first diurnal sidelobe height of 3 × 10−4 with respect to the central component, an improvement of a factor of 1300 over a single site. The background level of the network spectrum is lower by a factor of 50 compared to a single-site spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00680444
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  • 10
    Electronic Resource
    Electronic Resource
    Changes in soil organic matter with cropping as measured by organic carbon fractions and 13C natural isotope abundance (1993)
    Springer
    Plant and soil 155-156 (1993), S. 399-402 
    Details
    ISSN: 1573-5036
    Keywords: carbon-13 ; cropping systems ; δ13C ; KMnO4 oxidation ; soil organic matter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The decline in soil organic matter with cropping is a major factor affecting the sustainability of cropping systems. Changes in total C levels are relativelyinsensitive as a sustainability measure. Oxidation with different strength KMnO4 has been shown to be a more sensitive indicator of change. The relative size of soil C fractions oxidised by 333 mM KMnO4 declined with cropping, whilst the relative size of the unoxidised fraction increased. Changes in δ13C ratio have been used to measure C turnover in systems which include C3 and C4 species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025067
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