THE CHROMOSOMES IN CROSS-FERTILIZED ECHINOID EGGS
نویسندگان
چکیده
منابع مشابه
Experimental separation of pronuclei in fertilized sea urchin eggs: chromosomes do not organize a spindle in the absence of centrosomes
We tested the ability of chromosomes in a mitotic cytoplasm to organize a bipolar spindle in the absence of centrosomes. Sea urchin eggs were treated with 5 X 10(-6) colcemid for 7-9 min before fertilization to block future microtubule assembly. Fertilization events were normal except that a sperm aster was not formed and the pronuclei remained up to 70 microns apart. After nuclear envelope bre...
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Although, the first transgenic animal was produced more than 30 years ago, there are still many factors limiting efficiency of transgenesis. One of them is the low rate of transgene incorporation into the genome of microinjected eggs. This mini-review summarizes recent research methods based on pronuclear microinjection of rabbit fertilized eggs in order to reach higher efficiency of transgene ...
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The eccentric shift of the sea-urchin egg within the fertilization membrane under an electric field was analysed by measuring the electrophoretic mobility of the isolated fertilization membrane and that of the egg deprived of the fertilization membrane. In addition, the migration speed of the egg proper was measured within the fertilization membrane under the conditions that: either (1) the mov...
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This 12-week, double-blind, placebo-controlled study investigated the effects of fertilized egg powder (Young Tissue Extract; YT®) intake on outcome measures for depression. Fifty-five patients with depression were randomly assigned to receive YTE, YTE plus Melissa officinalis, or placebo for 12 weeks. At baseline, there were no significant differences in scores on the Hamilton Depression Ratin...
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A role for thioredoxin in metazoan DNA synthesis has been assessed by injecting rapidly dividing Xenopus eggs with purified heterologous thioredoxins, which might act as inhibitors if they were to replace resident thioredoxins in some but not all reaction steps. Of 10 tested proteins, spinach chloroplast thioredoxin m is the most potent inhibitor. Eggs cleave and produce cells lacking nuclei. D...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1908
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1536065