Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Superoxide dismutase in vegetative cells, heterocysts and akinetes of Anabaena cylindrica Lemm (1991)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 80 (1991), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract: Superoxide dismutase (SOD) activity was assayed in vegetative cells, heterocysts and akinetes of Anabaena cylindrica Lemm. The iron-containing isoenzyme (Fe-SOD) was in all cases predominant over the manganese-containing isoenzyme (Mn-SOD). Differentiated cells maintained the same relative content of the two enzymes as in vegetative cells. However, heterocysts and akinetes contained only 20 and 35%, respectively, of the total SOD activity present in vegetative cells.Both Mn-SOD and Fe-SOD activities increased in all types of cells isolated from A. cylindrica grown at high light intensity. The increase of SOD in heterocysts paralleled that of nitrogenase, suggesting a role of SOD in the protection mechanism of nitrogenase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1991.tb04654.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Oxygen concentration, nitrogenase activity and heterocyst frequency in the leaf cavities of Azolla filiculoides Lam (1989)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 59 (1989), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Oxygen concentration within the leaf cavities from the apex to the base of Azolla filiculoides Lam. was measured by an oxygen microprobe. The oxygen values in the leaf cavities were lower than in the aerated water and were within the range 0.157–0.183 atm. At 140 μE m−2 s−1 irradiance, oxygen decreased in the leaf cavities where acetylene reduction activity and heterocyst frequency were highest. Oxygen evolution and oxygen consumption inhibition by KCN strongly suggest that oxygen concentration changes, in the leaf cavities, are due to both photosynthesis of Azolla and Anabaena and to respiration of the whole system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1989.tb03126.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Ammonium content, nitrogenase activity and heterocyst frequency within the leaf cavities of Azolla filiculoides Lam (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 71 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Ion selective new microelectrodes have been used to measure the ammonium concentrations within the various leaf cavities from the apical to the basal ones, of Azolla filiculoides Lam. Ammonium is present in solution within all leaf cavities, and its concentration varies considerably from the apex to the base. Median leaf cavities, which have the highest rate of nitrogenase activity, contain 0.6–0.8 mM of ammonium and exhibit numerous cyanophycin granules accumulated within the Anabaena vegetative cells. Basal cavities contain 6 mM ammonium, the lowest nitrogenase activity and lowe cyanophycin granules in Anabaena. The mechaniems involved in ammonium accumulation in the basal leaf cavities are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb03823.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Ion determinations within Azolla leaf cavities by microelectrodes
    Amsterdam : Elsevier
    Sensors and Actuators B: Chemical 7 (1992), S. 431-435 
    Details
    ISSN: 0925-4005
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0925-4005(92)80338-X
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Ultrastructural changes in aging akinetes of nostoc sp
    Amsterdam : Elsevier
    Ultramicroscopy 12 (1983), S. 141 
    Details
    ISSN: 0304-3991
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-3991(83)90411-4
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Purification of iron superoxide dismutase from the cyanobacterium Anabaena cylindrica Lemm. and localization of the enzyme in heterocysts by immunogold labeling (1992)
    Springer
    Planta 187 (1992), S. 438-444 
    Details
    ISSN: 1432-2048
    Keywords: Anabaena ; Heterocyst ; Iron-superoxide dismutase (immunogold labeling)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Iron superoxide dismutase (Fe-SOD; EC 1.15.1.1) was isolated from the nitrogen-fixing cyanobacterium Anabaena cylindrica Lemm. Polyacrylamide gel electrophoresis separated the purified protein into three closely running, enzymatically active bands. The molecular weight of the enzyme was estimated by gel filtration to be about 40 kDa. Polyclonal antibodies were produced by immunization of rabbits with the isolated enzyme, and were purified on a column of protein A-Sepharose. The Fe-SOD antibody reacted with the purified Fe-SOD and also specifically recognized the protein in extracts of A. cylindrica. In the extracts, anti-Fe-SOD did not cross-react with Mn-SOD, an enzyme which belongs to an SOD class displaying high homology of primary and three-dimensional structure with respect to Fe-SOD. Iron superoxide dismutase was localized in heterocysts by immunogold labeling and transmission electron microscopy. These results are the first in-situ evidence for the presence of SOD in the cells specialized for nitrogenase activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00199961
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    In vitro development of parthenocarpic fruits of Crocus sativus L. (1987)
    Springer
    Plant cell, tissue and organ culture 11 (1987), S. 75-78 
    Details
    ISSN: 1573-5044
    Keywords: Crocus sativus L. fruit development in vitro ; parthenocarpy ; 2,4-dichlorophenoxyacetic acid ; benzyladenine ; gibberellin ; abscisic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In vitro development of parthenocarpic fruits of Crocus sativus L. was induced by culturing ovaries on MS agar medium supplemented with growth-regulators (2,4-D, GA3 and BAP). Amongh these, 2,4-D was the most effective in promoting fructification. The fructigenic activity was independent of both the stage at which the ovaries were excised (before, during or after anthesis) and pollination of the stigmas. Unlike the above compounds, abscisic acid inhibited fructification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00036578
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Effects of antibiotic treatments onAzolla-Anabaena andArthrobacter (1991)
    Springer
    Plant and soil 137 (1991), S. 151-155 
    Details
    ISSN: 1573-5036
    Keywords: Anabaena ; Arthrobacter ; Azolla ; erythromycin ; novobiocin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The leaf cavities and the sporocarps of the water fernAzolla contain bacteria belonging to the genusArthrobacter Conn and Dimmick. The number of these bacteria can be decreased by treating the plants with novobiocin and erythromycin. The latter antibiotic kills theAnabaena, soAnabaena free plants can be obtained. In these plants the bacteria disappear almost completely. The novobiocin does not affect the heterocyst differentiation, but it decreases the N2-fixation activity by affecting the synthesis of the dinitrogenase reductase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02187447
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Localization of iron-superoxide dismutase in the cyanobiont ofAzolla filiculoides Lam (1992)
    Springer
    Protoplasma 169 (1992), S. 1-8 
    Details
    ISSN: 1615-6102
    Keywords: Immunogold labeling ; Iron-superoxide dismutase ; Cyanobiont ; Azolla filiculoides ; Heterocysts ; Nitrogenase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Immunogold labeling and transmission electron microscopy were used to localize iron-superoxide dismutase (Fe-SOD) in the different cells of nitrogen-fixing cyanobacterial symbiont present within different leaf cavity groups ofAzolla filiculoides Lam. As evidenced by Western blotting and immunoprecipitation, Fe-SOD antibody fromAnabaena cylindrica recognized Fe-SOD in extracts of the cyanobiont and showed the same electrophoretic mobility and pattern as purifiedA. cylindrica Fe-SOD. In vegetative cells of the cyanobiont, Fe-SOD was mainly localized in the thylakoidal membranes and in the outer membrane. The labeling pattern was similar in vegetative cells of the various groups of leaf cavities examined except at the apex where a lower gold particle density was seen. In heterocysts of the leaf cavity groups containing high nitrogenase activity, Fe-SOD labeling was most pronounced and more intense than in vegetative cells. The Fe-SOD label was preferentially located throughout the heterocyst cytoplasm and in the honeycomb regions. In accordance with the decline in nitrogenase activity, the Fe-SOD gold particle density decreased significantly in heterocysts of basal leaf cavity group. The presence of Fe-SOD in regions of high nitrogenase protein levels, and the fact that the pattern of Fe-SOD label parallels that of nitrogenase activity support a role of Fe-SOD in the protection of nitrogenase against superoxide radicals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01343364
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...