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  • 1
    ISSN: 1617-4623
    Keywords: Ethylene ; Lycopersicon esculentum ; Fruit ripening ; Gene transcription
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have investigated the mechanism of action of the plant hormone ethylene by analyzing the expression of ethylene-inducible genes isolated from tomato (Lycopersicon esculentum). We have found that the expression of each cloned gene is regulated by ethylene in a unique manner. That is, for certain genes ethylene affects transcriptional processes, while for another gene it affects both transcriptional and post-transcriptional processes. Furthermore, induction of gene transcription by ethylene is organ specific for one gene, while for others it is not. In addition, we have measured gene expression as a function of ethylene concentration and have found that each gene displays a unique ethylene dose-response curve. Our results suggest that ethylene modulates gene expression by a variety of mechanisms.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] Monellin is a protein that elicits a flavor approximately 100,000 times sweeter than sugar on a molar basis. The protein exists naturally as a heterodimer, with its sweet flavor lost upon denaturation. A single–chain monellin gene, encoding both polypeptide chains linked by a hinge sequence, ...
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  • 3
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Acrylamide gel disc electrophoretic patterns of water-soluble extracts consistently showed the presence of 2–4 fast-moving, faint components which increased in relative intensity with post-mortem aging. The electrophoretic patterns of salt-soluble and urea-soluble extracts showed no corresponding pattern changes. The extractability of unbuffered water-soluble proteins was less at 24 hr postmortem than at 30 min post-mortem in breast muscle obtained from seven 7–10-week-old chickens. The percentage of dialyzable pep-tides in the water-soluble extracts and the percentages of salt-soluble and urea-soluble proteins in those extracts remained fairly constant during a 24hr post-mortem aging period.
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 77 (1955), S. 5703-5707 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2145
    Keywords: Key words Cell division ; Arabidopsis thaliana ; Embryo mutants ; Endosperm ; T-DNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A T-DNA-tagged, embryo-defective Arabidopsis thaliana mutant, fist, was identified and shown to exhibit defects in nuclear positioning and cell division orientation beginning at the four-cell stage of the embryo proper. Cell division orientation was randomised, with each embryo exhibiting a different pattern. Periclinal divisions did not occur after the eight-cell embryo proper stage and fist embryos lacked a histologically distinct protoderm layer. Terminal embryos resembled globular-stage embryos, but were a disorganised mass containing 30–100 cells. Some terminal embryos (5%) developed xylem-like elements in outer surface cells, indicating that the fist mutation affects radial pattern. A soybean β-conglycinin seed storage protein gene promoter, active in wild-type embryos from heart stage to maturity, was also active in terminal fist embryos despite their disorganised globular state. This indicated that some pathways of cellular differentiation in fist embryos proceed independently of both organised division plane orientation and normal morphogenesis. Endosperm morphogenesis in seeds containing terminal fist embryos was arrested at one of three distinct developmental stages and appeared unlinked to fist embryo morphogenesis. The β-conglycinin seed storage protein gene promoter, normally active in cellularised wild-type endosperm, was inactive in fist endosperm, indicating abnormal development of fist endosperm at the biochemical level. These data indicate that the fist mutation, either directly or indirectly, results in defects in cell division orientation during the early stages of Arabidopsis embryo development. Other aspects of the fist phenotype, such as defects in endosperm development and radial pattern formation, may be related to abnormal cell division orientation or may occur as pleiotropic effects of the fist mutation.
    Type of Medium: Electronic Resource
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