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Recent claims for the existence of meiotic drive in the ABO blood groups require the assumption of equal fertility (if there is no other selection operating) for the various mating types. There is evidence that does not support this assumption, and there are no convincing a priori grounds for making it. 相似文献
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Visual displays consisting of arrays of dots are proposed as a possible method for quantifying the parameters of the hidden-figures tests. Detection of form in such displays is difficult for cerebral palsied children as a group. Oculomotor control may be one of the determining factors in successful performance of the perceptual task. 相似文献
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A diagnosis of dicoumarol toxicity in a herd of Friesian cattle was made following investigation of the deaths of three mature cows and eleven yearling heifers. Affected stock had been fed wrapped, bailed silage containing approximately 90% sweet vernal grass ( Anthoxanthum odoratum ). Sweet vernal grass contains coumarin, which can be converted to dicoumarol, a vitamin K antagonist, through the action of moulds. Most deaths were preceded by lethargy, severe anaemia and subcutaneous and internal haemorrhage. Dicoumarol toxicosis was suspected based on clinical signs, necropsy findings and prolonged prothrombin and activated partial thromboplastin times. Dicoumarol analysis of blood from affected animals and silage confirmed the diagnosis. 相似文献
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A case of lymphocytic leukaemia with metastatic brain lesions and a concurrent Cladosporium trichoides infection is described in a cat. The lesions in the brain consisted of haemorrhage, foci of neoplastic cells in the parenchyma and perivascular cuffing with neoplastic cells. Lesions due to Cladosporium were found only in the kidney and were circumscribed necrotic areas surrounded by neutrophils and macrophages with hyphae in the centre. Identification of the fungus was made by growth characteristics, morphology, biochemical tests and experimental animal inoculation. Résumé. On décrit, chez un chat, un cas de leucétmie lymphocytique avec des lésions cérébrales métastatiques et une infection concourante Cladosporium trichoides. Les lésions cérébrales consistaient en une hémorragie, des foyers de cullules néoplastiques dans le parenchyme et un cuffing périvasculaire avec cellules néoplastiques. On a trouvé des lésions dues au Cladosporium dans le rein seulement et elles étaient des régions nécrotiques circonscrites entourées de neutrophils et de macrophages avec des hyphes au centre. On a identifié le fongus grâce aux caractéristiques de croissance, à la morphologie, à des tests biochimiques et à une infection chez des animaux expérimentaux. Zusammenfassung. Lymphozythämische Leukämiemit metastatischer Gehirnverletzung und begleitender Cladosporium trichoides Infiszierung, ist im Fall einer Katze beschrieben. Die Gehirnverletzung bestand aus Blutung, Foci der neoplastischen Parenchyma Zellen und perivaskularer Cuffing der neoplastichen Zellen. Cladosporium entstammende Verletzungsspuren wurden nur in der Niere entdeckt, und zwar, als abgestorbene Zonen, die von Hyphen-kernigen Neutrophil und Makrophage umrahmt waren. Die Fungus Identifikation wurde an Merkmale des Wachstums, Morphologie, biochemischen Proben und Infektion der Versuchstiere, vorgenommen. 相似文献
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LYNN G. WHEATON dvm diplomateacvs WILLIE M. REED dvm phd diplomateacvp 《Veterinary surgery : VS》1985,14(1):7-14
To facilitate blood collection from blood donor dogs, arteriovenous fistulas were established between the common carotid arteries and external jugular veins in five adult dogs. Twelve to 16 mm, side-to-side anastomoses were created using simple interrupted 6–0 polypropylene sutures. Starting 1 month after the surgical procedure, 500 ml of blood was collected from each dog as required. Electrocardiography, thoracic radiography, and cardiac output and rate were used to monitor cardiac changes. Blood flow characteristics, and proliferative and dystrophic cellular changes occurring in the vessels were documented in one dog.
The mean blood collection times were 2 minutes and 45 seconds from the fistula site and 9.0 minutes from the opposite jugular vein. Ventricular hypertrophy and myocardial changes were observed on electrocardiogram in two dogs, and radiographic evidence of pulmonary hypertension was noted in three dogs. Reversed blood flow was documented in the common carotid artery and external jugular vein distal to the arteriovenous fistula. Four dogs were still in use as blood donors 1 to 1 1/2 years after establishment of the fistulas. Clinical signs of congestive heart failure were not observed. 相似文献
The mean blood collection times were 2 minutes and 45 seconds from the fistula site and 9.0 minutes from the opposite jugular vein. Ventricular hypertrophy and myocardial changes were observed on electrocardiogram in two dogs, and radiographic evidence of pulmonary hypertension was noted in three dogs. Reversed blood flow was documented in the common carotid artery and external jugular vein distal to the arteriovenous fistula. Four dogs were still in use as blood donors 1 to 1 1/2 years after establishment of the fistulas. Clinical signs of congestive heart failure were not observed. 相似文献
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The first recorded outbreak of anthracnose ( Colletotrichum acutatum ) on ornamental lupin in the United Kingdom occurred in 1989. Seedborne infection by Colletotrichum acutatum was investigated after seed was implicated in the origin of the outbreaks and infection was found on seed of three of 14 cultivars tested. In pathogenicity tests, typical anthracnose symptoms developed only on plants of Lupinus spp; there were slight symptoms on Pisum sativum Vicia sativa and Lathyrus odoratus , but none on Vicia faba, Phaseolus coccineus, P. vulgaris and Onobrychis viciifolia 相似文献
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