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  • 1
    Digitale Medien
    Digitale Medien
    Evaluation of titania-alumina-supported hydrogenation catalysts for coal liquefaction applications (1989)
    s.l. : American Chemical Society
    Energy & fuels 3 (1989), S. 350-356 
    Details
    ISSN: 1520-5029
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Energietechnik , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ef00015a016
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  • 2
    Digitale Medien
    Digitale Medien
    The Preparation and Some Reactions of Ethyl α-Acetamidoacetoacetate (1948)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 70 (1948), S. 1150-1153 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja01183a081
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  • 3
    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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  • 4
    Digitale Medien
    Digitale Medien
    Energy expended on growth and gonad output in the ribbed musselAulacomya ater (1979)
    Springer
    Marine biology 53 (1979), S. 217-222 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Length/weight relationships have been computed for shell, flesh and byssus ofAulacomya ater (Molina) and energy values used to convert the weights to energy equivalents. Shell accounts for some 26% of total body energy, while the contribution of the byssus declines from 15 to 8% during growth. Observations of juvenile growth rates have been used to generate a Gompertz growth equation which predicts attainment of maximum length (90 mm) after 11 years. Reproductive condition has been assessed by monitoring seasonal fluctuations in the flesh weight of standard-sized individuals, calculated from monthly length/weight regressions. There appear to be three spawnings, of variable date and intensity, each year. From the above data, annual energy expenditure on growth and gonad output has been calculated for individuals of various sizes. The ratio of total production to biomass $$(P:\bar B)$$ is a declining clining function of shell length, dropping from 29.5 at 5 mm to 0.8 at 85 mm. The proportion of total production expended on gamete output increases steadily from 25% at attainment of maturity (15 mm) to 81% at 85 mm length. The considerable effects of changing size composition on the amount and type of production in natural populations are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00952429
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  • 5
    Digitale Medien
    Digitale Medien
    A unique method of computerizing chemical process information (1984)
    s.l. : American Chemical Society
    Journal of chemical information and modeling 24 (1984), S. 148-152 
    Details
    ISSN: 1520-5142
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ci00043a005
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  • 6
    Digitale Medien
    Digitale Medien
    The Ecology of Aggressive Behavior (1973)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 4 (1973), S. 117-138 
    Details
    ISSN: 0066-4162
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.es.04.110173.001001
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  • 7
    Digitale Medien
    Digitale Medien
    Bound states of He atoms on Ag(110) (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 910-916 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The spectrum of bound states of He atoms adsorbed on Ag(110) is calculated, using an interaction potential based on effective medium theory EMT for the repulsive term A exp(−bz) and the Zaremba–Kohn form for the attractive van der Waals dispersion term. The electronic charge density of the host in the selvedge region is modeled by superimposing atomic-charge densities using the Herman–Skillman tables and the prefactor A of the repulsive term is fitted to the exact ground state energy obtained from elastic He scattering data. Comparisons are made with the bound-state spectrum extracted from the measured resonances in the He scattering data and with the results of several other models used in the current literature. An assessment of the role played by higher-order dispersion contributions to the attractive potential is also included. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.471934
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  • 8
    Digitale Medien
    Digitale Medien
    Some physical features of soil after opencast mining (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 4 (1988), S. 0 
    Details
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. The soil of a restored opencast site in Northumberland is described and compared with the surrounding undisturbed soil. The most serious change in the soil was increased bulk density at the surface of the subsoil (0.3 m depth). Only a small overall reduction in pore space occurred, at the expense of continuous macropores. More of the pore space in the restored soil occurred as fine fissures as opposed to biotic channels, and the restored soil was weaker because of subsoiling and a loss of stability in microstructures. These changes are discussed in relation to root exploration, water movement and land management.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1475-2743.1988.tb00732.x
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  • 9
    Digitale Medien
    Digitale Medien
    Sex and Reproductive Status Related Brain Content of Mammalian and Chicken-II GnRHs in Rana esculenta (1997)
    Oxford, UK : Blackwell Science Ltd
    Journal of neuroendocrinology 9 (1997), S. 0 
    Details
    ISSN: 1365-2826
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Mammalian and chicken-II forms of gonadotropin-releasing hormone (mGnRH and cGnRH-II, respectively) have been measured simultaneously in the brain, pituitary, and peripheral terminal nerves (nasal area tissue) of adult males and females of a representative amphibian, Rana esculenta, during the annual reproductive cycle. Whereas in the male, brain concentrations of both GnRH forms showed significant reproductive status-related fluctuations, in the female brain only cGnRH-II content showed significant changes. The highest GnRH levels were recorded just prior to breeding in both sexes. In the pituitary both GnRHs were present in all seasons. In the peripheral terminal nerves, instead, only mGnRH was detected in all seasons confirming our previous immunohistochemical data. In both sexes furthermore, the brain and pituitary mGnRH levels were consistently much higher than those of cGnRH-II and there were no sex-related differences in the brain and pituitary content of GnRHs. Seasonal changes in brain GnRH levels may correlate with plasma sex steroid levels reinforcing the postulate that sex steroids affect GnRH neuronal systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2826.1997.00604.x
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  • 10
    Digitale Medien
    Digitale Medien
    The effect of drainage on herbage growth and soil development (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 43 (1988), S. 0 
    Details
    ISSN: 1365-2494
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: The effects of drainage on the yield of perennial ryegrass (Lolium perenne) swards grown for silage, and on soil development under grassland, were studied between 1982 and 1985.Over the 4 years of the experiment, drainage resulted in a mean increase in herbage production of 1-5 t dry matter (DM) ha−1, 16% above the yield recorded on the undrained site. Drainage also led to increased herbage nitrogen contents at every cut except one, so that total nitrogen recovery was increased by an average of 24-8 kg N ha−1 (15%) when drainage was installed. These total differences were mainly due to differences that were present at the first cut taken in June each year; drainage led to an average 24% increase in yield, and an average 27% increase in nitrogen recovery at the first cut.Detailed sward measurements taken in 1985 endeavoured to explain these differences; drainage increased depth to free water over winter, enabling increased root efficiency and nitrogen availability, greater tillering and more rapid leaf extension in early spring. There was some suggestion that drainage also led to an improved topsoil structure in terms of improved aggregation and aeration. This is important for long-term soil development as well as short-term herbage yield.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2494.1988.tb02158.x
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