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  • 1
    Electronic Resource
    Electronic Resource
    Intestinal Disaccharidase and Peroxidase Deficiencies during Eimeria nieschulzi Infections in Rats (1978)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 25 (1978), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS Experiments were designed to study intestinal pathophysiologic changes associated with coccidial infections in mammalian hosts. Pairs of male Sprague-Dawley rats were killed at various times postinoculation (PI) with 104 or 106 sporulated occysts of Eimeria nieschulzi. The small intestine from each rat was removed, weighed, measured, and divided into thirds. From the middle 11 cm of each third, one cm was fixed for histologic examination. Mucosa was scraped from the remaining 10 cm and was assayed for protein content and for peroxidase, sucrase and trehalase activities. Infection with E. nieschulzi was associated with increased mass of the small bowel. Histologically, crypt depth throughout the small bowel was significantly greater (P≤ 0.005) in infected rats than in non-infected ones on PI days 8 and 16. Villus height did not change drastically during low-dose infections (104 oocysts) and varied during high-dose infections (106 oocysts). As a result of these morphologic changes in the mucosa, crypt/villus ratios were usually significantly greater (P≤ 0.005) in all infected rats throughout the small bowel. In general, increased gut weight and changes in crypt and villus dimensions became evident by PI day 2, were most pronounced at PI day 8, and began to return to control values by PI day 16. Peroxidase, sucrase, and trehalase levels equaled or were slightly higher than in controls on PI day 2, dropped significantly below controls (P≤ 0.05) by PI day 8, and returned to, or exceeded control levels by PI day 16. The intensity of all changes was directly dose-dependent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1978.tb04400.x
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  • 2
    Electronic Resource
    Electronic Resource
    Societal Benefits and Costs of Manpower Training in Appalachia (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Growth and change 8 (1977), S. 0 
    Details
    ISSN: 1468-2257
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-2257.1977.tb00327.x
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  • 3
    Electronic Resource
    Electronic Resource
    THE EFFECTS OF INTERDISCIPLINARY EDUCATIONAL FORMATS ON CONCEPT RETENTION AND PROBLEM–SOLVING ABILITY (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Decision sciences 7 (1976), S. 0 
    Details
    ISSN: 1540-5915
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: The purpose of this study was to examine the effects of different interdisciplinary problem-oriented formats on a student's knowledge of and retention of disciplinary concepts and principles, his application of these concepts and principles to disciplinary problems, and his use of a discipline in his analysis of a complex problem. Performances of students enrolled in the experimental sections were compared to those of students enrolled in standard lecture-discussion sections. Regression analysis was used to analyze students' performance in order to control the effects of differences in student backgrounds.It was found that altering the pedagogical format and reward system within the experimental sections had no significant effect upon student performances in the experimental, problem-oriented program. In general, this study indicates that students taught in the standard lecture-discussion format in which grades are determined by examination over course material retain concepts and principles, apply these concepts and principles to disciplinary problems, and integrate disciplinary concepts into their analysis of complex problems as well as, if not better than, students taught in an interdisciplinary, problem-solving format.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-5915.1976.tb00662.x
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  • 4
    Electronic Resource
    Electronic Resource
    A REGRESSION ESTIMATION METHOD FOR COLLINEAR PREDICTORS (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Decision sciences 6 (1975), S. 0 
    Details
    ISSN: 1540-5915
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: This paper addresses the important and pervasive condition of multicollinear predictors in regression analysis. The paper discusses the rudiments of a recently proposed “improved estimation” procedure (ridge regression analysis) to be used when the predictors are not orthogonal and compares the empirical performance of the ridge technique in estimating some known coefficients with the traditional estimation methods of least squares and stepwise regression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-5915.1975.tb01052.x
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  • 5
    Electronic Resource
    Electronic Resource
    Control of feeding behaviour and selective cannibalism in the rotifer Asplanchna (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 7 (1977), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. Feeding responses in campanulate females of Asplanchna sieboldi were induced with filtrates of homogenized saccate female clonemates, showing that such behaviour can be triggered entirely by chemical stimuli. The failure of campanulates to attack campanulate clonemates, however, probably cannot be explained by the tissue chemistry of these females – filtered and unfiltered homogenates of campanulates were as active as those of saccates—and appears to be a function of some property limited to the campanulate body surface.The roles of chemical and physical properties of food items in controlling feeding behaviour in Asplanchna and other rotifers are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1977.tb01681.x
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  • 6
    Electronic Resource
    Electronic Resource
    Selective feeding and its effect on polymorphism and sexuality in the rotifer Asplanchna sieboldi (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 8 (1978), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. Campanulate females of A. sieboldi (clone 12C1) attack Asplanchna brightwelli and A. girodi much more readily than either the alga Volvox aureus or the rotifer Brachionus calyciflorus. Pre-feeding campanulates on B. calyciflorus prior to testing does not appreciably affect their response to this prey. Discrimination during feeding occurs immediately after the campanulate's corona contacts a potential food organism and is probably mediated by chemoreceptors. Once a food organism is attacked, the probabilities of it being captured and subsequently swallowed are high and similar for each of the four organisms tested.Since food organisms other than Asplanchna. such as V. aureus and B. calyciflorus, induce campanulates in this clone to produce cruciform, and thus frequently sexual, females in succeeding generations, a tendency of these campanulates to select congeneric prey would favour the maintenance of the campanulate morphotype and thus the continuation of parthenogenetic reproduction in the ensuing population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1978.tb01424.x
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  • 7
    Electronic Resource
    Electronic Resource
    George Burke Maxey: A Lasting Influence on the Course of Modern Hydrology (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 17 (1979), S. 0 
    Details
    ISSN: 1745-6584
    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.1745-6584.1979.tb03266.x
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  • 8
    Electronic Resource
    Electronic Resource
    Limitations of the Electrical Resistivity Method in Landfill Investigations (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 15 (1977), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The electrical resistivity method has been used to delineate shallow zones of ground-water contamination resulting from solid waste disposal sites. Application of this method to sites located in alluvial deposits in Iowa revealed that the degree of success of the method was directly related to the degree of contamination. A detailed investigation of the interrelationship between electrical resistivity, material variation, and water quality was conducted in the alluvial deposits of the Skunk River at Ames, Iowa. The lateral variation of materials at this site resulted in a large, natural scatter in the resistivity response. The decrease in resistivity due to contamination was not greater than this natural scatter and thus could not be detected. These results suggested a relationship between the scatter levels at any site and the minimum degree of contamination necessary to be detected. The minimum level of contamination which can be detected over the natural scatter is herein called the threshold value. The threshold value must be known before the resistivity method can be applied with confidence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1977.tb03185.x
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  • 9
    Electronic Resource
    Electronic Resource
    ELECTRON AFFINITY GAS CHROMATOGRAPHIC DETERMINATION OF BETA-NITROPROPIONIC ACID AS ITS PENTAFLUOROBENZYL DERIVATIVE IN CHEESES AND MOLD FILTRATES (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 42 (1977), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A sensitive gas chromatographic method has been developed for betanitropropionic acid (BNP), a compound produced by certain molds. The method is based on extraction, isolation and derivatization of the compound to yield its pentafluorobenzyl derivative and determination by electron affinity gas chromatogiaphy. The structure of the derivative was verified by mass spectrometry. The method has been applied to the determination of BNP in mold filtrates and cheeses with a limit of detection of about 1 and 3 ppm, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1977.tb08448.x
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  • 10
    Electronic Resource
    Electronic Resource
    SORPTION-DESORPTION OF VINYLCHLORIDE IN SELECTED POLYVINYLCHLORIDE-FOOD SIMULATING SOLVENT SYSTEMS (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 42 (1977), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The partition or equilibrium distribution of vinylchloride between a polymer phase (polyvinylchloride) and a contacting phase (food simulants) has been determined using n-hexane, distilled water and vegetable oil as the food simulants. The results from the respective polyvinylchloride (unplasticized)-food simulating systems showed a concentration dependent, nonlinear distribution of monomer, in favor of the polymer, with decreasing initial levels of vinylchloride for n-hexane and vegetable oil. For the unplasticized polyvinylchloride-water system, the partition coefficient was also concentration dependent but linear. The partition coefficient was constant with respect to initial monomer concentration for plasticized polyvinylchloride and the food simulants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1977.tb01258.x
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