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  • 2005-2009
  • 1975-1979  (15)
  • 1979  (7)
  • 1975  (8)
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  • 2005-2009
  • 1975-1979  (15)
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  • 1
    Digitale Medien
    Digitale Medien
    Regrowth of ryegrass swards subject to different cutting regimes and stocking densities (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 34 (1979), S. 0 
    Details
    ISSN: 1365-2494
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: A cutting experiment was carried out on a sward of S23 perennial ryegrass to study the effect of different defoliation regimes on regrowth and the factors affecting regrowth. The defoliation frequencies and intensities encompassed the range commonly found on continuously stocked pastures. The defoliation regimes produced swards of contrasting growth form with regrowth characteristics which differed in respect of senescence loss, fall in water-soluble carbohydrate concentration, residual leaf area index, photosynthesis per unit leaf area index and photosynthesis per unit area of land. Regrowth was most closely related to the latter. These results were used to interpret data for net canopy photosynthesis of continuously grazed pastures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2494.1979.tb01454.x
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  • 2
    Digitale Medien
    Digitale Medien
    FETAL AXILLARY LYMPHANGIOMA COMPLICATING BREECH DELIVERY (1975)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 82 (1975), S. 0 
    Details
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: A case of massive lymphangioma arising from the axilla and complicating a breech delivery is described. From research of the literature it is believed that this is the only such case recorded.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-0528.1975.tb00692.x
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  • 3
    Digitale Medien
    Digitale Medien
    Virus Assembly (1975)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 44 (1975), S. 555-611 
    Details
    ISSN: 0066-4154
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Chemie und Pharmazie , Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.bi.44.070175.003011
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  • 4
    Digitale Medien
    Digitale Medien
    Quaternary methylsulfonylammonium salts. New reagents for mesylation. Mechanism of hydrogen multiexchange in sulfene reactions (1975)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 97 (1975), S. 2566-2567 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja00842a057
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  • 5
    Digitale Medien
    Digitale Medien
    Photosynthesis, respiration and nitrogen fixation in white clover (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 34 (1979), S. 0 
    Details
    ISSN: 1365-2494
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: An apparatus in which shoot and root CO2 exchange and acetylene reduction can be simultaneously measured in specific white cloverrhizobium associations is described. In mature stolonating clover there was a fairly constant ratio between net photosynthesis, root respiration and acetylene reduction. Of the net carbon fixed daily (12 h light of 80 W m-2, 400–700 nm; day/night temperature 15°C) 12% was lost during the dark period by the shoot and 17% by the nodulated root. Changes in the rate of acetylene reduction by nodulated root systems occurred more slowly than those in rates of root respiration in response to reduced irradiance. In 21·5 h continuous darkness the rate of acetylene reduction remained constant. Responses to increased irradiance were more immediate in both root respiration and acetylene reduction. In plants maintained at 15°C in a 12-h, 80-W m-2 photoperiod there was no significant diurnal variation in acetylene reduction or root respiration. Acetylene depressed root respiration by 20%. Assuming the energy requirement of the nitrogenase system to be the same when reducing acetylene and N the depression can be used as an indication of the energy requirement of fixed N assimilation, metabolism and export in the nodulated root. Of the net carbon fixed daily 3·4% was utilized in this way in plants growing in a 12-h photoperiod (80 W m-2, 400–700 nm) at 15°C.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2494.1979.tb01456.x
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  • 6
    Digitale Medien
    Digitale Medien
    A refinement of the crystal and molecular structure of hydrazinium sulphate by neutron diffraction (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 31 (1975), S. 2470-2474 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740875007820
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  • 7
    Digitale Medien
    Digitale Medien
    Some relationships between size, food availability and energy balance in the ribbed musselAulacomya ater (1979)
    Springer
    Marine biology 51 (1979), S. 141-149 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The effects of body size and suspension density on filtration rates, assimilation efficiencies and respiration rates in the ribbed musselAulacomya ater (Molina) have been determined by means of short-term laboratory experiments. Filtration rates accelerate rapidly in response to increasing algal concentration up to approximately 10×106 cellsDunaliella primolecta l-1, beyond which a plateau is approached. Percentage increments are greatest in small individuals. Assimilation efficiencies are independent of body size, but decline rapidly with increasing ration to approach zero above 32×106 cells l-1. Increases in respiration rate accompany increments in filtration rate in all but the smallest size class tested. Filtration, assimilation efficiency and respiration measurements are used to calculate ingestion rations, assimilation rations and scope for growth for mussels of different sizes over a range of algal concentrations. Scope for growth, expressed as percentage change in body energy per day, is a declining function of body size, but larger individuals achieve their maximum growth rates at lower ration levels than smaller ones. Growth efficiency is independent of body size, and is maximal at 5×106 cells l-1, where 29 to 43% of ingested ration is converted into body energy. The applicability of these experimental results to natural ecosystems is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00555193
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  • 8
    Digitale Medien
    Digitale Medien
    A quasioptimal finite element method for elliptic interface problems (1975)
    Springer
    Computing 15 (1975), S. 127-135 
    Details
    ISSN: 1436-5057
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung In [1] hat Babuška gestörte Variationsmethoden für elliptische Probleme mit unstetigen Koeffizienten vorgeschlagen. Diese Methoden sind aber nicht quasioptimal, d.h. Näherungslösungen, welche durch solche Verfahren erzeugt werden, haben nicht mehr die „beste Approximationseigenschaft” der Elemente des Unterraums der zulässigen Näherungen. In dieser Arbeit betrachten wir gewisse Extrapolaten, welche vermittels einer in [1] angegebenen Methode erhalten werden. Wir erhalten „optimale” asymptotische Fehlerabschätzungen. Unsere Methodik ist ähnlich derer, die wir in [7] gebrauchten, um Extrapolationsmethoden für elliptische Probleme mit glatten Koeffizienten zu erhalten.
    Notizen: Abstract In [1] Babuška proposed perturbed variational methods for elliptic problems, with discontinuous coefficients. However, these methods are not quasioptimal, i.e. the approximate solutions generated by such methods do not reproduce the properties of “best approximation” possessed by the subspace of admissable approximants. In this paper we consider certain extrapolates obtained by use of a particular method of [1] and obtain “optimal” asymptotic error estimates. Our approach is similar to that of [7] where we proposed extrapolation methods for elliptic problems with smooth coefficients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02252861
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  • 9
    Digitale Medien
    Digitale Medien
    The direct spinal area of the inferior olivary nucleus: An electron microscopic study (1975)
    Springer
    Experimental brain research 22 (1975), S. 13-24 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Inferior olive ; Spinal afferents ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Identification of the direct spinal areas (portions of the dorsal and medial accessory nuclei) within the opossum inferior olivary complex was accomplished by mapping the location of the terminal degeneration by the Fink-Heimer technique subsequent to cervical cord lesions. Following similar lesions, sampling of these same regions for electron microscopic study was assured by examination of transversely oriented, 1 μ plastic sections prior to thin sectioning. The first evidence of electron dense axon terminals was found at a survival time of 24 hours. At survival times of 36, 48 and 72 hours, degenerating presynaptic profiles shrink, become irregular in shape and are totally or partially surrounded by glial processes. Spinal terminals average 1–2 μ in their greatest dimension, contain round, clear synaptic vesicles and generally contact small diameter (0.4–1.8 μ) dendritic shafts or occasional spiny appendages. The spiny dendritic appendages make up the central core of the olivary glomeruli and these juxtaposed dendritic processes exhibit gap junctions. At longer survival times (5, 7 and 9 days) many presynaptic profiles with either round or pleomorphic synaptic vesicles remain normal in appearance and contact dendritic shafts or the spiny appendages within glomeruli. Afferents from other sources (possibly including intrinsic neurons) must terminate within the direct spinal portion of the nuclear complex to account for the numerous axon terminals which retain normal morphology after such long survival times.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00235408
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  • 10
    Digitale Medien
    Digitale Medien
    Determination of the sedimentary microbial biomass by extractible lipid phosphate (1979)
    Springer
    Oecologia 40 (1979), S. 51-62 
    Details
    ISSN: 1432-1939
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The measurement of lipid phosphate is proposed as an indicator of microbial biomass in marine and estuarine sediments. This relatively simple assay can be performed on fresh, frozen or frozen-lyophilized sediment samples with chloroform methanol extraction and subsequent phosphate determination. The sedimentary lipid phosphate recovery correlates with the extractible ATP and the rate of DNA synthesis. Pulse-chase experiments show active metabolism of the sedimentary phospholipids. The recovery of added 14C-labeled bacterial lipids from sediments is quantitative. Replicate analyses from a single sediment sample gave a standard deviation of 11%. The lipid extract can be fractionated by relatively simple procedures and the plasmalogen, diacyl phospholipid, phosphonolipid and non-hydrolyzable phospholipid content determined. The relative fatty acid composition can be readily determined by gas-liquid chromatography. The lipid composition can be used to define the microbial community structure. For example, the absence of polyenoic fatty acids indicates minimal contamination with benthic micro-eukaryotes. Therefore the high content of plasmalogen phospholipids in these sediments suggests that the anaerobic prokaryotic Clostridia are found in the aerobic sedimentary horizon. This would require anaerobic microhabitats in the aerated zones.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00388810
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