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  • Life and Medical Sciences  (2)
  • *Protein Biosynthesis  (1)
  • BIOSCIENCES  (1)
  • 1
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    Histone gene expression: progeny of isolated early blastomeres in culture make the same change as in the embryo (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-08-01
    Description: Stage-specific changes in histone synthesis during sea urchin development reflect the expression of different sets of genes. The three kinds of blastomeres formed at the 16-cell stage are the earliest "determined" cells and fall into three distinct size classes. At this stage that cells synthesize only "early" histones. Such blastomeres can survive and divide in culture after being separated from the embryo, whether or not they are permitted to aggregate. With or without reaggregation, cultured progeny cells of each type of isolated blastomere perform the same changeover of histone synthesis as takes place in the intact embryo, that is, they begin spontaneously to synthesize a new set, the "late" histone variants. Normal contact relations among cells of the embryo are, therefore, not required for this programmed change in gene expression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Arceci, R J -- Gross, P R -- New York, N.Y. -- Science. 1980 Aug 1;209(4456):607-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7394523" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blastomeres/*metabolism ; Cells, Cultured ; DNA/metabolism ; DNA, Superhelical/metabolism ; Embryo, Nonmammalian/*metabolism ; Female ; *Genes ; Histones/*biosynthesis ; Nucleosomes/metabolism ; *Protein Biosynthesis ; Sea Urchins ; *Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Panel discussion: Present status and perspectives in the study of cytodifferentiation at the molecular level. II. Discussion (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 72 (1968), S. 219-230 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040720415
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Ammonia effects in cultures of normal and transformed 3T3 cells (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 80 (1972), S. 373-381 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: 3T3 and SV-40 transformed 3T3 mouse fibroblasts were cultured in media with serum and antibiotics plus ammonia (NH3 z NH4+) added as NH4C1. Both cell lines cultured without added ammonia showed normal morphology and multiplication even though ammonia in the medium at the end of the culture period ranged from 35 to 48 μg/ml. Ammonia concentrations being significantly higher in media removed from cells at the end of the culture period than in media incubated identically without cells, verified that cells released substantial quantities of ammonia in addition to components of the medium which underwent spontaneous breakdown. Both cell lines showed changes in morphology and highly significant reductions in cell multiplication which increased progressively as the concentration of added ammonia on the initial day of culture was increased to 35μg/ml. Control 3T3 cultures released significantly greater quantities of ammonia per cell than control cultures of transformed cells but their multiplication was more adversely affected by added ammonia. There were downward shifts in pH of the culturing medium for both cell lines as culture age increased at all concentrations of added ammonia, However, significant reductions in cell multiplication resulted from additions of ammonia that did not produce significant changes in extracellular pH. The data show that studies upon the effects of pH of the medium on cultured cells require control of ammonia concentrations.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040800308
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  • 4
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    RNA protein synthesis in developing sea urchin eggs (1967)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Ribonucleic acid and protein synthesis in sea urchin eggs after fertilization
    Keywords: BIOSCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
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