| 1. |
MAIN ARTERIES IN THE REGION OF THE NECK AND THORAX OF THE AUSTRALIAN CASSOWARY |
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Canadian Journal of Research,
Volume 20d,
Issue 12,
1942,
Page 363-367
Fred H. Glenny,
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摘要:
A mature specimen of the Australian cassowary (Casuarius australisWallace) was dissected and a diagram of the main arteries in the neck region prepared. In the arrangement and distribution of these arteries, the cassowary differs from other species of birds previously studied. The left radix aortae and left ductus Botalli remain as a ligamentous vestige, the ligamentum aortae. The left internal carotid artery alone enters the hypapophysial canal. The right internal carotid artery is lacking or has become modified to form the ascending oesophageal artery of the adult, in the basal portion of the neck. The pattern of the arrangement of the main arteries in the neck and thorax shows a relatively primitive avian condition.
ISSN:1923-4287
DOI:10.1139/cjr42d-030
出版商:NRC Research Press
年代:1942
数据来源: NRC
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| 2. |
POLARIZATION AND PROGRESSION IN PAIRING: III. PACHYTENE OBSERVATIONS INNEODIPRION(HYMENOPTERA) |
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Canadian Journal of Research,
Volume 20d,
Issue 12,
1942,
Page 368-379
Stanley G. Smith,
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摘要:
From an analysis of 72 nuclei at pachytene in three species ofNeodiprionit is shown (1) that the rate of pairing is independent of chromosome size, (2) the nucleolar chromosomes are at no disadvantage in pairing, and (3) the incompletions observed are the result of an interruption by fixation of the process of zygotene pairing. It is concluded that there is no fixed relationship between the intimacy of telophase association and pachytene pairing, the degree of relational coiling at diplotene, and the distribution of chiasmata at metaphase.
ISSN:1923-4287
DOI:10.1139/cjr42d-031
出版商:NRC Research Press
年代:1942
数据来源: NRC
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| 3. |
STUDIES ON FACTORS INFLUENCING THE HEALTH OF PIGS: I. THE RELATIONSHIP OF BLOOD HAEMOGLOBIN CONCENTRATIONS TO RATE OF GAIN IN SUCKLING PIGS |
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Canadian Journal of Research,
Volume 20d,
Issue 12,
1942,
Page 380-386
W. E. Swales,
E. W. Crampton,
G. C. Ashton,
L. Choquette,
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摘要:
The trends of blood haemoglobin concentrations in suckling pigs in a herd in which clinical anaemia does not occur have been studied and compared to rates of gain in body weight.Ferrous sulphate and reduced iron were then used to keep the haemoglobin concentrations at higher levels, and statistical analysis of the observations snowed a significant difference in body weight at weaning time between the treated and control groups.The results indicate that pigs should be provided with a source of iron within a day or two after birth in order to ensure normal development and, possibly, resistance to disease.Work on this and other possible factors in disease resistance is being continued.
ISSN:1923-4287
DOI:10.1139/cjr42d-032
出版商:NRC Research Press
年代:1942
数据来源: NRC
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