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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of N-CBz-glycyl-glycyl-arginyl peptidase and glycyl-prolyl peptidase of Bacteroides gingivalis (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 22 (1987), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Bacteroides gingivalis produces large amounts of proteolytic enzymes which may play a role in its virulence. These enzymes may participate in the tissue destruction of the inflammatory process. In this study, the characteristics of two such enzymes, N-CBz-glycyl-glycyl-arginyl peptidase (N-CBz-Gly-Gly-Arg peptidase) and glycyl-prolyl peptidase (Gly-Pro peptidase) were investigated. The enzymes eluted in different peaks from an anion exchange column. N-CBz-Gly-Gly-Arg peptidase was associated with cells up to 48 h in culture. If cultured longer, it also released in the supernatant. It exhibited optimal activity between pH of 7.0 and 7.5 and was readily inactivated by heat treatment (45°C for 15 min). The enzyme activity was inhibited by p-chloromercuribenzoic acid (PCMB), leupeptin and antipain, suggesting that it is a thiol protease. The B. gingivalis N-CBz-Gly-Gly-Arg peptidase was different from the serum enzyme that digests the same substrate. The serum enzyme was more resistant to heat treatment and was inhibited by diisopro-pylfluorophosphate (DFP). B. gingivalis also produced Gly-Pro peptidase that is released in the supernatant. The enzyme has an optimal pH range between 7.5 and 8.0. The B. gingivalis Gly-Pro peptidase was inhibited by DFP, suggesting that it represents a serine protease. The serum Gly-Pro peptidase did not differ from the bacterial enzyme with respect to its sensitivity to inhibitors; however, they were markedly different in heat sensitivity. The bacterial enzyme was completely inactivated at 60°C for 30 min, whereas the serum enzyme was not inactivated even at 1 h at 60°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1987.tb01608.x
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  • 2
    Electronic Resource
    Electronic Resource
    Species Hybrids of Tea (1958)
    [s.l.] : Nature Publishing Group
    Nature 181 (1958), S. 1674-1675 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A chromatogram for phenolic constituents of C. irrawadiensis shows a characteristic spot which at once distinguishes it from a chromatagram of C. sinensis2, while chromatograms of a punctate F hybrid between C. irrawadiensis and C. sinensis var. assamica (Masters) show spots characteristic of both ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1811674a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    What is Tea? (1957)
    [s.l.] : Nature Publishing Group
    Nature 179 (1957), S. 506-507 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] TEA is a very old and popular beverage. More than one-third of the Western world's tea is made in India, where the Government has taken steps to define this important export. The general definition1 states that tea is made from "plants of the Camellia genus and Thea species". Although this is not a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/179506a0
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  • 4
    Electronic Resource
    Electronic Resource
    Morphological Basis of Quality in Tea (1954)
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 630-631 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] TEA breeding at this Station was begun by us in 1936 on the recommendation of a commission of inquiry led by Prof, (now Sir Frank) Engledow. Much attention has been paid to the production of tea of the quality which is characteristic of Assam and which can be obtained from no other source. For the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/173630a0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Toxicity of Mercury Vapour to Insects (1938)
    [s.l.] : Nature Publishing Group
    Nature 142 (1938), S. 754-754 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A REFERENCE was made in a communication under this title by H. C. Gough in NATURE of May 21, p. 922, to an old Indian custom of placing a small quantity of mercury in a container amongst stored pulses. It seems worth while to direct attention to an analogous belief amongst the Ahoms. A notable ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/142754b0
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