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  • 1985-1989  (7)
  • 1960-1964  (4)
  • 1955-1959  (1)
  • 1945-1949  (1)
  • 1
    Electronic Resource
    Electronic Resource
    CHROMATOGRAPHIC HETEROGENEITY OF SOME ENZYMES IN NORMAL TISSUES AND TUMORS (1961)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 94 (1961), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1961.tb35563.x
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  • 2
    Electronic Resource
    Electronic Resource
    Quantitative determination of trace levels of cationic surfactants in environmental matrixes using fast atom bombardment mass spectrometry (1988)
    s.l. : American Chemical Society
    Analytical chemistry 60 (1988), S. 2613-2620 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00174a016
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  • 3
    Electronic Resource
    Electronic Resource
    On the significance of C3—C4 intermediate photosynthesis to the evolution of C4 photosynthesis (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 12 (1989), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Evidence is drawn from previous studies to argue that C3—C4 intermediate plants are evolutionary intermediates, evolving from fully-expressed C3 plants towards fully-expressed C4 plants. On the basis of this conclusion, C3—C4 intermediates are examined to elucidate possible patterns that have been followed during the evolution of C4 photosynthesis. An hypothesis is proposed that the initial step in C4-evolution was the development of bundle-sheath metabolism that reduced apparent photorespiration by an efficient recycling of CO2 using RuBP carboxylase. The CO2-recycling mechanism appears to involve the differential compartmentation of glycine decarboxylase between mesophyll and bundle-sheath cells, such that most of the activity is in the bundlesheath cells. Subsequently, elevated phosphoenolpyruvate (PEP) carboxylase activities are proposed to have evolved as a means of enhancing the recycling of photorespired CO2. As the activity of PEP carboxylase increased to higher values, other enzymes in the C4-pathway are proposed to have increased in activity to facilitate the processing of the products of C4-assimilation and provide PEP substrate to PEP carboxylase with greater efficiency. Initially, such a ‘C4-cycle’ would not have been differentially compartmentalized between mesophyll and bundlesheath cells as is typical of fully-expressed C4 plants. Such metabolism would have limited benefit in terms of concentrating CO2 at RuBP carboxylase and, therefore, also be of little benefit for improving water- and nitrogen-use efficiencies. However, the development of such a limited C4-cycle would have represented a preadaptation capable of evolving into the leaf biochemistry typical of fully-expressed C4 plants. Thus, during the initial stages of C4-evolution it is proposed that improvements in photorespiratory CO2-loss and their influence on increasing the rate of net CO2 assimilation per unit leaf area represented the evolutionary ‘driving-force’. Improved resourceuse efficiency resulting from an efficient CO2-concentrating mechanism is proposed as the driving force during the later stages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1989.tb01629.x
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  • 4
    Electronic Resource
    Electronic Resource
    Expression of C4-like photosynthesis in several species of Flaveria (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 12 (1989), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Photosynthetic metabolism was investigated in leaves of five species of Flaveria (Asteraceac), all previously considered to be C4 plants. Leaves were exposed to 14CO2 for different intervals up to 16s. Extrapolation of 14C-product curves to zero time indicated that only F. trinervia and F.bidentis assimilated atmospheric CO2 exclusively through phosphoenolpyruvate carboxylase. The proportion of direct fixation of 14CO2 by ribulose-I, 5-bisphosphate carboxylase/oxygenase (Rubisco) ranged from 5 to 10% in leaves of F. australasica. F. palmeri and F. vaginata.Protoplasts of leaf mesophyll and bundle sheath cells were utilized to examine the intercellular compartmentation of principal photosynthetic enzymes. Leaves of F. australasica, F. palmeri and F. vaginata contained 5 to 7% of the leaf's Rubisco activity in the mesophyll cells, while leaves of F. trinervia and F. bidentis contained at most 0.2 to 0.8% of such activity in their mesophyll cells. Thus, F. trinervia and F. bidentis have the complete C4 syndrome, while F. australasica, F. palmeri and F. vaginata are less advanced, C4-like species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1989.tb02127.x
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  • 5
    Electronic Resource
    Electronic Resource
    Coumarin-like Substances from Australian Termites (1962)
    [s.l.] : Nature Publishing Group
    Nature 195 (1962), S. 1101-1102 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nasutins have been detected in Nasut^termes exitiosus Hill, N. fumigatus Brauer, N. magnus Froggatt and N. walkeri Hill; but they appear to be absent from N. dixoni Hill and from all species of other genera (Porotermes, Heterotermes, Hamitermes and Drepanotermes) so far examined. With N. exitiosus, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1951101a0
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  • 6
    Electronic Resource
    Electronic Resource
    A New Synthesis of Cinnoline Derivatives (1949)
    [s.l.] : Nature Publishing Group
    Nature 163 (1949), S. 918-919 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN connexion with an investigation on the elaboration of the Coffey1 synthesis of 1-ketotetra-hydrocarbazoles, a study of the action of acidic reagents on a number of 1 : 2-cyclohexadionemonophenylhydrazones of the type (I) has recently been undertaken. Although it has not so far ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/163918c0
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  • 7
    Electronic Resource
    Electronic Resource
    Polymorphism and Parthenogenesis in a Ptinid Beetle (1956)
    [s.l.] : Nature Publishing Group
    Nature 177 (1956), S. 847-848 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] P. hirtellus has been maintained in culture at the Pest Infestation Laboratory for many generations and abundant material of both sexes has been available for study. Attempts to obtain cultures of P. latro by similar methods have led to the discovery that this is a parthenogenetic form of unusual ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/177847b0
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  • 8
    Electronic Resource
    Electronic Resource
    Net flux of carbon dioxide from tropical forests in 1980 (1985)
    [s.l.] : Nature Publishing Group
    Nature 316 (1985), S. 617-620 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The FAO/UNEFs8'9 estimate of deforestation in the tropics is compared in Table 1 with estimates made by Myers10'12 and the FAO's Production Yearbook13. Comparison of the rates given by FAO/UNEP and the Production Yearbook assumes that deforestation of the open and closed forests of the former is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/316617a0
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  • 9
    Electronic Resource
    Electronic Resource
    Histochemical localization of mushroom tyrosinase in whole tissue sections on nitrocellulose (1989)
    Springer
    Histochemistry and cell biology 90 (1989), S. 379-381 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Mushrooms were cut into vertical and horizontal sections. These sections were blotted onto nitrocellulose sheets and the sheets were then stained for tyrosinase using l-dopa. Tyrosinase was localized throughout the mushroom tissues but more enzyme was located in the epidermis of the cap, the gill region, and the stipe. Preincubation of the nitrocellulose sheets in specific inhibitors of tyrosinase completely blocked enzyme staining, suggesting that the enzyme stained areas on the nitrocellulose blots were regions of tyrosinase activity. Immunochemical localization of tyrosinase was similar to that observed by histochemical staining. Nitrocellulose blotting of mushrooms allows localizations of enzyme at the whole tissue level and may be useful for other enzymes in mushrooms as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00508316
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  • 10
    Electronic Resource
    Electronic Resource
    An extracellular polysaccharide produced by Palmella mucosa Kütz. (1964)
    Springer
    Archives of microbiology 49 (1964), S. 158-166 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An extracellular polysaccharide composed of glucose, fucose, arabinose and glucuronic acid in a molar proportion of 11:6:3:1 is a major end-product of photosynthesis by Palmella mucosa Kütz. The liberation of polysaccharide is related to the age of the culture. Glucose can substitute efficiently for CO2 as the source of carbon for polysaccharide synthesis. Nitrate-nitrogen from sodium, potassium and calcium salts can be used in the mineral salts medium with little differences in carbon metabolism of the alga. Ammonium nitrate produces an acidic medium which limits polysaccharide production. The incorporation of C14 into the polysaccharide from NaHC14O3 shows initially a trend toward intracellular synthesis. The C14 appears in the extracellular polysaccharide after prolonged exposure. Glucose-C14 is actively transformed to polysaccharide material which is an indication that glucose may play an important role in the synthesis of polysaccharide by Palmella mucosa Kütz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00422139
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