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  • Wiley  (54)
  • Blackwell Publishing Ltd  (27)
  • American Geophysical Union  (14)
  • 1980-1984  (80)
  • 1955-1959  (9)
  • 1950-1954  (6)
  • 1
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    Economics of Harem Maintenance by a Neotropical Bat (1981)
    Wiley
    Details
    Publication Date: 1981-06-01
    Print ISSN: 0012-9658
    Electronic ISSN: 1939-9170
    Topics: Biology
    Published by Wiley on behalf of Ecological Society of America.
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Method for Coding Data on Protozoan Strains for Computers (1980)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 27 (1980), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Traditionally, observations on the nature of protozoa have been published in periodicals or books, or remain buried in research notebooks. The retrieval and processing of information on a particular species or strain are dependent solely upon individual investigators. Although various modern methods have been applied to the study of protozoa, no attempt has been made to develop a system with which information on protozoan strains can be stored, retrieved easily, and processed for various analyses by computer technology. Based upon an existing system for encoding data on bacterial strains, a complementary system applicable to protozoan strains was developed and is described herein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1980.tb05374.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    COMPARISON OF FIVE LEAST-SQUARES INVERSION TECHNIQUES IN RESISTIVITY SOUNDING (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 30 (1982), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: A brief history of the development of the inverse problem in resistivity sounding is presented with the development of the equations governing the least-squares inverse. Five algorithms for finding the minimum of the least-square problem are described and their speed of convergence is compared on data from two planar earth models. Of the five algorithms studied, the ridge-regression algorithm required the fewest numbers of forward problem evaluations to reach a desired minimum.Solution space statistics, including (1) parameter-standard errors, (2) parameter correlation coefficients, (3) model parameter eigenvectors, and (4) data eigenvectors are discussed. The type of weighting applied to the data affects these statistical parameters. Weighting the data by taking log10 of the observed and calculated values is comparable to weighting by the inverse of a constant data error. The most reliable parameter standard errors are obtained by weighting by the inverse of observed data errors. All other solution statistics, such as dataparameter eigenvector pairs, have more physical significance when inverse data error weighting is used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1982.tb01334.x
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  • 4
    Electronic Resource
    Electronic Resource
    An economic assessment of the potential benefits of replacing grass by grass-clover mixtures for 18-month beef systems (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 38 (1983), S. 0 
    Details
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A mathematical model which simulates the potential production and utilization of herbage on perennial ryegrass and grass-white clover swards in the context of an 18-month beef enterprise is described. Using the model the potential costs and benefits of replacing grass by grass-clover mixtures have been determined. Potentially grass-clover swards receiving no fertilizer N are shown to have annual DM yields equivalent to ryegrass swards receiving at least 300 kg N ha −1. Apart from the benefits of reduced fertilizer N usage there appear to be indirect benefits related to a lower concentrate requirement per head. In consequence, from an economic viewpoint grass-clover swards potentially compare very favourably with heavily fertilized grass swards, even if account is taken of the opportunity costs of lower stocking rates associated with grass-clover systems. However, this conclusion awaits experimental confirmation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2494.1983.tb01649.x
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  • 5
    Electronic Resource
    Electronic Resource
    The integration of conservation with grazing for milk production: a computer simulation of the practical and economic implications (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 38 (1983), S. 0 
    Details
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Earlier studies have concluded that for a dairy enterprise the most profitable conservation strategy, where cutting and grazing areas are separate, is generally associated with relatively low-digestibility silage. The aim of this study has been to investigate whether this conclusion remains true where cutting and grazing are integrated. A mathematical model of grass production and utilization by a dairy enterprise has been developed from information collected from a variety of experimental sources. It was found that cutting strategies aimed at making low-digestibility silage could not automatically be regarded as the most profitable. In good grass-growing conditions strategies resulting in low-digestibility silage did appear to offer the highest gross margins per unit area, but under average and poor growth conditions the greatest profits were associated with high-digestibility silage strategies. In particular, it was noted that the timing and frequency of conservation cuts influenced the efficiency with which grass could be utilized on the grazing areas and this fact rather than yield of conserved material influenced the comparative biological and economic efficiency of the different cutting strategies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2494.1983.tb01648.x
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  • 6
    Electronic Resource
    Electronic Resource
    Changes in the lignin and hemicellulose concentrations of ten varieties of temperate grasses with increasing maturity (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 35 (1980), S. 0 
    Details
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The lignin and total hemicellulose concentrations of ten varieties of temperate grasses (five species) were determined with increasing maturity. A strong correlation existed between the lignin and hemicellulose concentrations. Lignin and hemicellulose concentrations tended to be higher in cocksfoot and timothy than in perennial ryegrass and diploid varieties also had higher lignin and hemicellulose concentrations than their tetraploid counterparts. The hemicellulose fractions were further separated into their linear and branched components whose compositions were determined. The varieties with higher lignin concentrations showed a higher linear:branched ratio and the ‘linear’ components also had higher xylose: arabinose ratios. These findings were consistent for both leaf and stem tissue although the effects from stem tissue were more marked.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2494.1980.tb01525.x
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  • 7
    Electronic Resource
    Electronic Resource
    AIR-LIFT SAMPLERS FOR ZONE-OF-SATURATION MONITORING (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water monitoring & remediation 1 (1981), S. 0 
    Details
    ISSN: 1745-6592
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6592.1981.tb00797.x
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  • 8
    Electronic Resource
    Electronic Resource
    Impact of Dredged Material Disposal Upon Ground-Water Quality (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 19 (1981), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: A two-year ground-water monitoring program at three upland dredge disposal sites in the United States was conducted to determine whether the sites were contributing to ground-water degradation. Facilities were located at Grand Haven, Michigan, Sayreville, New Jersey, and Mobile, Alabama. Leachate samples were collected from vacuum/pressure lysimeters and ground-water wells. Ground-water wells were situated directly under the fill, downgradient, and in an area representative of indigeneous ground-water quality. Analyses of 27 parameters from 10 sampling periods indicated that calcium and manganese represent major water quality problems due to their contribution to water hardness. Of the trace metals, manganese and iron were found to exceed recommended EPA drinking-water quality standards at all sites. Levels of potassium, total organic carbon (TOC), chloride, sodium, calcium, alkalinity, and magnesium appear to affect local ground-water quality. Possible controlling mechanisms for observed leachate concentrations for these parameters include absorption, adsorption, ion exchange complexation, dilution and biological activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1981.tb03469.x
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  • 9
    Electronic Resource
    Electronic Resource
    The Loch Dee Project: a Study of the Ecological Effects of Acid Precipitation and Forest Management on an Upland Catchments in Southwest Scotland. 1. Preliminary Investigations (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 15 (1984), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A description is given of the preliminary stages of an ecological study of the effects of acid precipitation and coniferous afforestation in the Loch Dee Catchments in the Galloway area of south-west Scotland. Information on the current chemical, hydrologieal and biological status of the loch and its three major tributaries is presented.Acid precipitation episodes of pH 〈 4.5 occurred for 20% of rainfall in 1981 and were generally coincident with the movements of air masses from areas of high sulphur emissions to the south, east and north. In 1981 the mean pH of the loch was 5.2 and in recent years artificial slocking of the loch has been employed to maintain a viable trout fishery. The densities of fish populations in two of the major inflowing streams were sometimes 〈 10 fish per 100 m2. During high stream flow, the concentrations of free acidity (H+) and aluminium were in the range where a significant reduction in the survival of hatching trout would be expected. The impact of various forms of calcium carbonate, spread on the catchments or added directly to one inflowing stream, is being monitored to assess long-term changes in stream and loch ecology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1984.tb00289.x
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  • 10
    Electronic Resource
    Electronic Resource
    Observations on the food of juvenile Atlantic salmon, Salmo salar L, reared in a Scottish hill loch (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 23 (1983), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: An analysis of the stomach contents of 0+ and 1 + Atlantic salmon parr, Salmo salar, introduced into a Scottish hill loch showed that benthos, plankton, and surface organisms were all taken. Molluscs comprised a relatively small proportion of the food material, probably because they are less active than other animal groups. The most abundant plankter was Daphnia hyalina. Cyclops spp. were scarce and no Diaptomus spp. were present in the stomachs despite their abundance in the loch plankton. Laboratory experiments indicated that copepods were difficult to capture and that D. hyalina was the organism most frequently selected, even when larger individuals of this species were removed from the environment. Differences between the results from the Scottish loch and similar work in Wales, Sweden and Canada are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1983.tb02909.x
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