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  • Polymer and Materials Science  (2)
  • revertants  (2)
  • *Genes, Regulator  (1)
  • 1985-1989  (5)
  • 1940-1944
  • 1
    Electronic Resource
    Electronic Resource
    A short review of research on male sterility and prospects for F1 hybrid varieties in field beans (Vicia faba L.) (1989)
    Springer
    Euphytica 41 (1989), S. 87-90 
    Details
    ISSN: 1573-5060
    Keywords: Vicia faba ; field bean ; faba bean ; cytoplasmic male sterility ; maintainer and restorer lines ; revertants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary It has not yet been possible to utilise cytoplasmically inherited male sterility (CMS) in Vicia faba, in the commerical production of F1 hybrids. The main problem has been a rapid increase in the proportion of fertile revertants during multiplication. Investigations, mainly in France, have clarified environmental causes of phenotypic instability, CMS and maintainer lines with improved stability have been selected, and two new cytoplasms have been produced by mutation of the first two. CMS is known to be associated with cytoplasmic spherical particles, and recognisable types of double stranded RNA, and there may also be an association with mitochondrial DNA, and polypeptides of mitochondrial origin. The better understanding of CMS may eventually lead to more easily managed forms, either through genetic manipulation or biochemical assays that breeders can use for screening for stability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022416
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  • 2
    Electronic Resource
    Electronic Resource
    Prospects for commercialisation of F1 hybrid field beans Vicia faba L. (1989)
    Springer
    Euphytica 41 (1989), S. 81-86 
    Details
    ISSN: 1573-5060
    Keywords: Vicia faba ; F1 hybrids ; heterosis ; cost/benefit ratio ; cytoplasmic male sterility ; revertants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Yields of F1 hybrids averaged 22% more than the mean of their heavier-yielding inbred parents, and the advantage of hybrids over composite populations varied from 3 to 18%, more in winter than spring beans. From estimates of cost/benefit ratios that included the possibility of poor seedset on male steriles, on average 1 year in 10, it was concluded that hybrid seed might cost more than twice that of conventional varieties, but a 10% increase in yield on a 4t/ha crop would cover this extra cost of seed. Thus, hybrids could still be the more profitable type of variety provided seed rates are low and yield levels high. It is therefore still worthwhile to pursue the goal of stable cytoplasmic male sterility (CMS) and/or a control of the rate of increase in revertants. Some methods are suggested whereby it might be possible to reduce revertants, improve pollination or exploit heterosis other than with CMS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022415
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  • 3
    Electronic Resource
    Electronic Resource
    ESR-electrochemical cells and their performance in studies of redox processes (1989)
    Weinheim : Wiley-Blackwell
    Electroanalysis 1 (1989), S. 1-11 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A review of the various simultaneous ESR-electrochemical techniques that have been developed is presented. Special advantages and disadvantages of the stationary and flow-through cell configurations are described. A critical evaluation of the in situ ESR-electrochemical cells developed to date has also been made. A selected survey of applications is presented to illustrate the wide range of chemical information on redox reactions which can be obtained by the simultaneous ESR-electrochemical method.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140010103
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  • 4
    Electronic Resource
    Electronic Resource
    An evaluation of ultrathin ring and band microelectrodes as amperometric sensors in electrochemical flow cells (1989)
    Weinheim : Wiley-Blackwell
    Electroanalysis 1 (1989), S. 23-33 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Gold and platinum ultrathin ring microelectrodes (0.1-0.5 mm thick, 1.5-4 mm diameter) were made by sputtering, from fired metalloorganic paint, and from foil for use as sensors in a thick-layer wall-jet flow cell. An end-on array of three 0.1 μm × 0.5 mm gold band electrodes were mounted parallel to the flow direction in a thin-layer channel cell. These ultrathin sensors, along with a jet-centered carbon microdisk, were evaluated in the amperometric flow-injection mode for temporal stability, calibration sensitivity, detectivity, background signal, and flow rate dependence of the analytical signal using ferrocene samples in acetonitrile containing 10-4-10-2 M TEAP. The detectivity of gold paint ring electrodes made on borosilicate glass was 3-6 nM, an order of magnitude lower than any of the other electrodes tested. Analytical signals from gold paint and foil rings and the carbon microdisk had the best temporal stability. The current for the ultrathin band array in a channel cell was flow rate-independent, and the exponential dependence of cell current on flow rate was 0.11-0.14 for ultrathin rings in the thick-layer wall-jet mode.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140010105
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  • 5
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    The immunoglobulin octanucleotide: independent activity and selective interaction with enhancers (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-03-20
    Description: The thymidine kinase (tk) promoter of herpes simplex virus includes an octanucleotide sequence motif (ATTTGCAT) that is also an essential component of immunoglobulin kappa gene promoters. In the absence of an enhancer, tk promoter derivatives that contain this element support a higher rate of transcription than those that lack it. The action of the kappa enhancer augments that of the octanucleotide in B lymphoid cells; when both elements are present, tk promoter activity is increased by more than an order of magnitude. In contrast, the presence of the octanucleotide in this promoter markedly reduces its response to a nonimmunoglobulin enhancer. These results suggest that the octanucleotide may mediate a selective interaction among promoters and enhancers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Parslow, T G -- Jones, S D -- Bond, B -- Yamamoto, K R -- AI22536/AI/NIAID NIH HHS/ -- CA20535/CA/NCI NIH HHS/ -- CM07810/CM/NCI NIH HHS/ -- New York, N.Y. -- Science. 1987 Mar 20;235(4795):1498-501.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3029871" target="_blank"〉PubMed〈/a〉
    Keywords: DNA, Viral/genetics ; *Enhancer Elements, Genetic ; *Gene Expression Regulation ; *Genes, Regulator ; Immunoglobulin kappa-Chains/*genetics ; Lymphocytes/physiology ; Moloney murine sarcoma virus/genetics ; *Promoter Regions, Genetic ; Simplexvirus/genetics ; Thymidine Kinase/genetics
    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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