Anti-metabolic Extract from the Brain of Protopterus aethiopicus
نویسندگان
چکیده
منابع مشابه
Ornithine-Urea Cycle Enzymes in the African Lungfish, Protopterus aethiopicus.
The presence of all five enzymes of the ornithine-urea cycle has been demonstrated in the liver of the African lungfish Protopterus aethiopicus. Levels of activity of the rate-limiting enzymes, carbamoyl phosphate synthetase and argininosuccinate synthetase, are similar to those in the premetamorphic tadpole of Rana catesbeiana and considerably lower than the levels reported for other ureotelic...
متن کاملRespiratory allocation and standard rate of metabolism in the African lungfish, Protopterus aethiopicus.
This paper quantifies the relationship between respiratory allocation (air vs. water) and the standard rate of metabolism (SMR) in the primitive air-breathing lungfish, Protopterus aethiopicus. Simultaneous measurements of oxygen consumed from both air and water were made to determine the SMR at ecologically relevant aquatic oxygen levels for juveniles 2 to 221 g. Total metabolic rate was posit...
متن کاملAestivation of the African lungfish Protopterus aethiopicus: cardiovascular and respiratory functions.
The present study was undertaken to elicit the temporal sequence of changes in cardiovascular and respiratory function during aestivation. Twelve lungfish (2-6 kg) equipped with ECG electrodes, arterial and buccal cannulae, were studied while aestivating in mud or in artificial cloth-bag nests. The periods of observation ranged from 0̂ 5 to 9-5 months. The mean arterial blood pressure gradually ...
متن کاملDecline of theAfrican lung¢sh (Protopterus aethiopicus) in LakeVictoria (East Africa)
Catch and e¡ort data for the period 1973^1990 demonstrate a dramatic decline of lung¢sh in the Tanzanian waters of Lake Victoria. Bottom trawl catches in the Mwanza Gulf showed a decline in catch rates from 67.5 kg h in1973 to 5.5 kg h in1986.Trawling of commercial vessels in the Speke Gulf revealed a decline in lung¢sh catches from1.3 kg h 1 in1986 to 0.07 kg h 1 in 1990. The development of an...
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در این پژوهش به بررسی اثر افزایش ترافیک بر روی تعداد تصادفات پرداخته شده است. به این منظور 30 تقاطع در شهر تهران بطور تصادفی انتخاب گردید و تعداد تصادفات ماهیانه در این تقاطعات در طول سالهای 89-90 از سازمان کنترل ترافیک شهر تهران استخراج گردید و با استفاده از مدل داده های تابلویی و نرم افزار eviews مدل خطی و درجه دوم تخمین زده شد و در نهایت این نتیجه حاصل شد که تقاطعات پر ترافیک تر تعداد تصادفا...
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ژورنال
عنوان ژورنال: Nature
سال: 1968
ISSN: 0028-0836,1476-4687
DOI: 10.1038/217671a0