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  • 1
    Electronic Resource
    Electronic Resource
    Effect of in ovo bursectomy on the course of an infectious bronchitis virus infection in line C White Leghorn chickens (1991)
    Springer
    Archives of virology 118 (1991), S. 225-234 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary White Leghorn line C chicks were surgically bursectomised (Bx) in ovo to eliminate antibody production. After inoculation with infectious bronchitis virus (IBV) at 14 days after hatching, Bx chicks experienced a more severe and longer lasting infection than intact chicks. The severity and duration of clinical infection in the Bx chicks resembled that previously observed in the highly susceptible line 15 I chicks, however no increase in mortality was observed, in contrast to the high levels of mortality recorded in IBV-inoculated line 15 I chicks. After secondary challenge the degree of damage to the ciliated epithelium of the trachea was greater in the Bx chicks than in the intact chicks. The results indicate that, although antibodies play an important role in recovery from IBV infection, other immunological factor(s) may also be involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01314032
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Physiological aspects of growth promotion in poultry (1983)
    Springer
    Veterinary research communications 7 (1983), S. 59-68 
    Details
    ISSN: 1573-7446
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Growth promotants used in poultry production fall into two categories: those which increase the utilization of food (e.g. antibiotics) and those which have anabolic activity. The mode of action of antibiotics is not certain. Several interacting factors may be involved: altered gut microflora, reduced ammonia production, thinner intestinal walls, reduced epithelial cell turnover and improved nutrient absorption. It has been suggested that antibiotics have a systemic action but evidence of gross physiological change is difficult to find. Thyroid function was not affected after feeding aureomycin but penicillin-fed chickens had a greater plasma growth hormone concentration than control birds. The plasma corticosterone responses to a stressor, corticotrophin, were similar in control and penicillin-fed birds. Goitrogenic substances cause lipid deposition and thyroactive substances improve feather cover but neither consistenly improve growth. Oestrogenic substances tend to stimulate energy consumption and lipogenesis at the expense of protein deposition. Use is made of them to improve carcass quality of capons and turkeys. Androgenic substances have either no effect or depress growth. Growth hormone improves weight gain, increases protein and decreases fat in the carcass. It may be of use in the production of older table birds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02228597
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructural changes in sarcosomes after exposure of adult Calliphora erythrocephala to lethal and sub-lethal high temperatures (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 78 (1971), S. 49-57 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The effects of lethal and sub-lethal high temperatures on the morphology of intact flight muscle sarcosomes of adult Calliphora erythrocephala are described. Treatment of adult flies to lethal temperatures results in ultrastructural changes in the organisation of the cristae and the appearance of electron opaque inclusions. These changes have not been observed after sub-lethal heat treatment, when 50% of the animals recover. It is suggested that changes in the ultrastructure of the intact sarcosomes may be correlated with changes in their ability to couple oxidative phosphorylation with α-glycerophosphate. Age-dependent changes in the sensitivity of sarcosomes are related to changes in the heat death point of the animal and suggest that the impairment of sarcosomal function may be one of the primary lesions in heat death of adult C. erythrocephala.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040780108
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Changes in the functional efficiency of flight muscle sarcosomes during heat death of adult Calliphora erythrocephala (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 78 (1971), S. 37-47 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The temperature sensitivity of flight muscle mitochondria from adult Calliphora erythrocephala has been studied. Intact flies were treated to sublethal and lethal high temperatures, their sarcosomes were isolated and the efficiency of the coupling of oxidation and phosphorylation was measured. The temperature sensitivity of sarcosomes is correlated with the heat death point of the intact animal and the impairment of oxidative phosphorylation with α-glycerophosphate suggests that a breakdown in ATP synthesis may be one of the causes of heat death. Restitution of enzyme activity was observed in mitochondria isolated from flies recovering from sublethal heat treatment. The results suggest that the impairment of membrane-enzyme complexes may be important lesions in heat death.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040780107
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    Paper (German National Licenses)
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