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  • 1975-1979  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Chlorophyllase activity in developing leaves of Phaseolus vulgaris L. (1978)
    Springer
    Planta 139 (1978), S. 79-83 
    Details
    ISSN: 1432-2048
    Keywords: Chlorophyllase ; Chlorophyll-proteins ; Etiolation ; Greening ; Phaseolus ; Plastid membranes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In crude extracts of primary leaves from dark grown seedlings of Phaseolus vulgaris L., relatively high hydrolytic activity of chlorophyllase (chlorophyll-chlorophyllido-hydrolase, EC 3.1.1.14) was observed. When plants were exposed to continuous illumination, the enzyme activity in the extracts was doubled within 3 days and both chlorophyll a and b were synthesized. However, when exposed to periodic illumination (1 min light-59 min dark) the enzyme activity was doubled within 1 to 2 days and chlorophyll a was synthesized but the formation of chlorophyll b was suppressed. When plants were transferred from periodic illumination to continuous illumination chlorophyll b was synthesized but the activity of chlorophyllase declined. Chloramphenicol blocked the increase in enzyme activity independent of the light regimes, but cycloheximide inhibited the activity more effectively during growth in the light. The presence of chlorophyllase activity in the leaves is discussed in relation to the chlorophyll-proteins and the membranes known to be present in chloroplasts. It is suggested that the enzyme is synthesized on plastid ribosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390814
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nuclear structure of low-lying 0+ states in Ge and Se isotopes (1975)
    Springer
    The European physical journal 274 (1975), S. 251-257 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The following meanlives of levels in72Se have been measured using the recoildistance Doppler-shift method:Τ(2+, 862 keV)=3.1±0.6 ps,Τ(2+′, 1317 keV)=12.5±2.6 ps,Τ(4+, 1638 keV)=1.2±0.3 ps andΤ(6+, 2469 keV)≦0.7 ps. These meanlives yield sixB(E2) values which are discussed together with the known data of the depopulation of the excited 0+′ state at 937 keV. Systematics of 0+′ states in the mass region 70≲A≲100 show that the low excitation energy of the 0+′ states is correlated with subshell closures. This suggests that the previous interpretation of the 0+′ state in72Se as a rotational band head is questionable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437737
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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