Premeiotic DNA Synthesis and the Time of Chromosome Pairing in Locusta migratoria
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چکیده
منابع مشابه
Premeiotic DNA Synthesis and the Time of Chromosome Pairing in Locusta migratoria.
Labeled spermatocytes from locusts killed 0, 1, 2, 3, 4, and 6 days after exposure to tritiated thymidine were examined with the electron microscope to determine their meiotic stage. It was found that tritiated thymidine uptake in young spermatocyte nuclei is completed some 24 hours before synaptinemal complexes are formed. It is concluded that in the locust, premeiotic DNA synthesis is complet...
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A concise synthesis of (1S*,3R*,6R*)-1-hydroxy-7(14),10-bisaboladien-4-one, an antifeedant against the locust Locusta migratoria isolated from the Japanese cedar Cryptomeria japonica, was achieved by starting from 4-hydroxy-2-cyclohexenone.
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کاتالیست یک سنتز جدید برای تیواترها توصیف شده است. واکنش الکل ها با آریل، هتروآریل و آلکیل تیو ل ها درحضور 1،3،5- تری آزو- 2،4،6- تری فسفرین-2،2،4،4،6،6 هگزاکلراید ((tapc به عنوان یک کاتالیست موُثر، بازده های خوب تا عالی از تیواترها را حاصل می کند. علاوه براین، واکنش تحت شرایط بدون فلز و بدون حلال پیش می رود، بنابراین یک مکمل جالب برای روش های شناخته شده سنتز تیواترها ارائه می دهد. یک مکانیسم ا...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1970
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.66.1.94