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  • Articles  (1,320)
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  • Springer  (1,320)
  • 2020-2022
  • 2005-2009
  • 1980-1984  (1,320)
  • 1980  (1,320)
  • Biology  (1,320)
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  • Articles  (1,320)
  • Other Sources
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  • 2020-2022
  • 2005-2009
  • 1980-1984  (1,320)
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  • 1
    Electronic Resource
    Electronic Resource
    Ly-1 inducer and Ly-1,2 acceptor t cells in the feedback suppression circuit bear an I-J-subregion controlled determinant (1980)
    Springer
    Immunogenetics 11 (1980), S. 549-557 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract An I-J-subregion controlled determinant is expressed on Ly-1 inducer and Ly-1,2 acceptor T cells in the feedback suppression circuit. Ly-1 T cells absorb the I-J antibody reactive with the Ly-1,2 acceptor T cell, suggesting that both inducer and acceptor T cells have the same 1-J determinant. Since less than 10 percent of Ly-1 or Ly-1,2 T cells are killed by anti-I-J plus complement treatment, the I-J determinant demarcates functionally distinct subsets of both the Ly-1 and Ly-1,2 T-cell sets. This I-J determinant is not expressed on a detectable number of Ly-1 helper T cells which induce B lymphocytes to produce anti-sheep red cell antibody in tissue culture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01567824
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  • 2
    Electronic Resource
    Electronic Resource
    The benthic biological conditions of Los Angeles-Long Beach Harbors: Results of 28 years of investigations and monitoring (1980)
    Springer
    Helgoland marine research 34 (1980), S. 193-205 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Los Angeles-Long Beach Harbors were a grossly polluted body of water at the time of the initiation of benthic biological studies in 1951. Industrial, domestic and storm wastes were emptied into these waters with little or no treatment. The inner harbor waters contained little or no dissolved oxygen and much of the benthos was azoic or possessed a stressed community. However, the outer harbor water mass contained adequate dissolved oxygen, and the benthos supported a rich fauna dominated by many species of polychaetes. A pollution abatement program was initiated in 1968, and today many former wastes have been eliminated or are being diverted to treatment plants for processing. The benthic fauna changed markedly and rapidly following this environmental clean-up. Peaks in population were reached throughout the harbor in 1973–1974 which was followed by a slight decline then stability. An oil tanker explosion, pre-treatment of fish-cannery wastes then diversion of these wastes to a sewage treatment plant, and a change from primary to secondary treatment of sewage brought about changes in the benthic fauna. In the latter instance, benthic population of polychaetes, fish populations and the number of birds feeding within the area decreased significantly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01984040
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  • 3
    Electronic Resource
    Electronic Resource
    Ökophysiologische Untersuchungen an Pflanzen der Namib-Wüste (1980)
    Springer
    Naturwissenschaften 67 (1980), S. 21-28 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Notes: Abstract The southern Namib desert has a vegetation cover of mainly succulent plants in which species of the Mesembryanthemaceae are predominant. Climatically this area is characterized by hot and dry days, and cool and humid nights with episodic rainfalls only in winter. In this environment a great number of species perform a crassulaceaen acid metabolism (CAM). The responses of these plants to water stress as well as the regulation of CAM in the natural habitat are described and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424499
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  • 4
    Electronic Resource
    Electronic Resource
    Leaf temperatures and energy balance ofWelwitschia mirabilis in its natural habitat (1980)
    Springer
    Oecologia 44 (1980), S. 258-262 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Welwitschia mirabilis is a perennial desert plant with extremely large leaves (0.5–1.0 m broad, 1–2 m long). Leaf temperatures were measured in the field and the energy budget was calculated. The portions of the leaf which were kept above the ground had leaf temperatures which were only 4–6°C above air temperature. In the leaf portions which were in contact with the ground leaf temperatures were 6–12°C above air temperature (absolute maximum 51°C). The important feature in the energy budget ofWelwitschia mirabilis is its high reflectivity (38% of the global radiation). Only about 56% of the global radiation is absorbed by the thick leathery leaves. The energy loss due to convection is of the same order of magnitude as the reflection and it is abouy the same in the portions of leaf on and above the ground. The difference in leaf temperatures found in these portions is due to the loss of thermal radiation from the section of leaf above the ground to the cooler ground which is shaded by the leaf. The provision of a heat sink due to the large area of shade cast by these large leaves is of significance to the existence ofWelwitschia mirabilis in its arid habitats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572688
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  • 5
    Electronic Resource
    Electronic Resource
    Tubulin immunohistochemistry (1980)
    Springer
    Histochemistry and cell biology 68 (1980), S. 183-195 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary We report here the results observed when tubulin fluorescence immunohistochemistry is performed upon dissociated cultures of nervous tissue, principally of chick embryo spinal cord. When fixation includes nonpolar solvents or detergents, a uniform fluorescence is seen in neuron perikarya (with the exception of their nuclei), and the processes to which they give rise. Fixation with formaldehyde or glutaraldehyde alone, however, results in a discontinuous staining of neurites, and a less regular staining of their perikarya. The former pattern of response can be elicited if aldehyde fixation is followed by exposure to non-polar solvents. Such results are obtained both in thinly spread regions of the cultures, where neurons and their processes can easily be seen, and in the cell aggregates that also characterise them. Possible interpretations of these results are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00489513
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  • 6
    Electronic Resource
    Electronic Resource
    Larval dispersal of a deep-sea hydrothermal vent bivalve from the Galápagos Rift (1980)
    Springer
    Marine biology 57 (1980), S. 127-133 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The prodissoconch morphology of an unclassified mytilid from a hydrothermal vent on the Galápagos Rift indicates the presence of a planktotrophic larval stage with longrange dispersal capabilities. Recorded abyssal currents are probably sufficient to transport such larvae hundreds of kilometers. It is suggested that one or more aspects of the unusual biological or physico-chemical conditions (such as high microbial densities, elevated water temperatures, and hydrogen sulfide concentrations) encountered at vents, provide a stimulus to larval settlement. Such a behavioral response, perhaps coupled with a “gregarious settling” response, would provide a means of concentrating relatively sedentary organisms in and around these restricted, geographically isolated regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387378
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  • 7
    Electronic Resource
    Electronic Resource
    Flow through brushborders and similar protuberant wall structures (1980)
    Springer
    The journal of membrane biology 56 (1980), S. 183-190 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Longitudinal flow through channels with protuberant wall structures such as brushborders were studied both experimentally and theoretically. The experiments were performed using tubes with synthetic internal brushborders, scaled to resemble the geometry and flow in proximal tubules of the kidney. Fractional flow rates in the brushborder were deduced from transit times of dye traces through the central core and total flow rate. The measured ratios of brushborder to core flowQ B /Q C were found to be independent of Reynolds number over the rangeRe=0.01–0.2. They agreed reasonably well with theoretical predictions based on the Kozeny-Carman equation for flow through arrays of parallel cylinders. The predictions can be extended to arbitrary geometries and turbulent flow conditions by appropriate modifications. Extrapolation of the results to the proximal tubule of the kidney indicate that brushborder flowrates there vary from 0.003 to 0.09% of total flow. Any axial transport in these structures would be predominantly diffusive in nature, and would be highly unlikely to affect radial brushborder gradients and transmural flux.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01869475
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  • 8
    Electronic Resource
    Electronic Resource
    The boundaries and copy numbers of Ti plasmid T-DNA vary in crown gall tumors (1980)
    Springer
    Molecular genetics and genomics 177 (1980), S. 637-643 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The Ti plasmid DNA maintained in octopine-type crown gall tumor lines is variable, but always includes at least part of the Ti plasmid that maps over the region of Hind III fragment 1 of pTi-B6-806. The right-hand boundary of transferred DNA (T-DNA) varies considerably among the three independent tumor lines examined; the left boundary was not located definitively. The T-DNA of two sibling clones of the same tumor line, E1 and E9, appears identical. The copy number of T-DNA in E9 tumor DNA appears higher for the right end (about 30 copies) than for the left end (approximately 1 copy).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272674
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis for petroleum products in marine environments (1980)
    Springer
    Helgoland marine research 33 (1980), S. 257-271 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Petroleum is composed of a complex mixture of hydrocarbons that readily undergo chemical and biological conversions on entering aquatic environments. These conversions lead to the formation of a host of oxygenated products, some of which are potentially toxic to marine life and to the consumer of fishery products. State-of-the-art analytical methods, as employed in our laboratories, utilize glass-capillary gas chromatography in conjunction with mass spectrometry to analyze environmental samples containing trace amounts of aliphatic and aromatic petroleum hydrocarbons. These procedures are applied on a routine basis to the analysis of seawater, sediments and tissues of marine organisms. Despite this analytical proficiency, a need exists for analyzing oxygenated and other polar petroleum products in environmental samples. For example, techniques such as high-performance liquid chromatography (HPLC), in conjunction with on-line fluorometric assay techniques and mass spectrometry, make possible the analysis of polar oxygenated compounds resulting from both chemical and biological conversions. These methodologies are first steps toward the development of routine assay procedures for environmental samples. Current techniques for hydrocarbon analyses and new methods for analyzing polar aromatic compounds are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02414751
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  • 10
    Electronic Resource
    Electronic Resource
    Diel changes in plankton and water chemistry in Wicken brickpit (1980)
    Springer
    Hydrobiologia 74 (1980), S. 249-271 
    Details
    ISSN: 1573-5117
    Keywords: plankton ; diet change ; vertical migration ; crowding ; light intensity ; pond ; water chemistry ; nutrient changes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In a flooded Fenland brickpit 3 metres deep a 24-hr study (supplemented by other observations in the field and in the laboratory) revealed marked changes with depth and time in oxygen concentration, pH, total carbon dioxide, ammonium, oxidised nitrogen, phosphate and silica; as well as changes in the rate of cell-division and the vertical distribution of phytoplankton (Dinobryon and Peridinium), and the feeding and vertical movement of zooplankton (copepods, Bosmina, Ceriodaphnia, Polyarthra and Keratella). Directional trapping of zooplankton revealed relationships between population density and the intensity of locomotory activity (a relationship subsequently supported by laboratory experiments), and between the rate of change of light intensity and the direction of swimming. Significant temporal segregation of the occupancy of a given level by zooplankters implies interspecific competition. Transient peaks in the concentrations of some nutrients near the surface are tentatively attributed to nutrient release by zooplankters that have fed at depth. Small-scale temporal and spatial heterogeneity of the type described here may help to explain the ‘paradox of the plankton’. These marked diel changes in water chemistry suggest that conclusions based on the analysis of single water samples should be viewed with caution.[/p]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008758
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