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  • 1
    Monograph available for loan
    Monograph available for loan
    Leiden : Backhuys Publ.
    Call number: M 09.0014
    Type of Medium: Monograph available for loan
    Pages: VI, 565 S. , Ill., graph. Darst., Abb.
    ISBN: 9073348676
    Classification:
    Ecology
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Call number: AWI A12-17-90659
    Type of Medium: Series available for loan
    Pages: 72 S. , Ill., graph. Darst. , 24 cm
    ISBN: 3531083473
    Series Statement: Vorträge / Rheinisch-Westfälische Akademie der Wissenschaften 347
    Language: German
    Note: Die Vorlage enth. insgesamt 2 Werke , Enth. auch: Globale Aspekte der atmosphärischen Chemie / Paul J. Crutzen
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 61 (1989), S. 1755-1758 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 37 (1960), S. 124-133 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung 1. Merulius lacrymans unterscheidet sich in seinem “Aufbauquotienten” (Gramm Trockengewichtszunahme/Gramm veratmete Glucose) nicht grundsätzlich von anderen Holzzerstörern (Merulius silvester, Coniophora cerebella, Polyporus vaporarius). 2. Die Atmung des Hausschwammes ist durch 2,4-Dinitrophenol in etwa dem gleichen Ausmaß zu entkoppeln wie die von Coniophora cerebella und sogar stärker als die von Merulius silvester. 3. Es wird daher geschlossen, daß Merulius lacrymans keine spezifische Fähigkeit zur Wasserbildung beim Substratabbau zukommt. 4. Die Mycelstränge bei Merulius lacrymans sind die bevorzugten Wanderwege für markiertes Phosphat und C14-Glucose. Die Wandergeschwindigkeit beträgt mindestens etwa 2 cm/Std und übertrifft die Leistung einer normalen Diffusion weit. 5. Die Versuche zum Stofftransport werden als Stütze (wenn auch nicht als Beweis) für die Annahme einer spezifischen Wasserleitfähigkeit des Hausschwammes betrachtet.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 15 (1951), S. 428-429 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 128 (1981), S. 407-411 
    ISSN: 1432-072X
    Keywords: Cadmium ; Euglena ; Mercury ; Photochemical activities ; Photosynthesis ; Respiration ; Zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Results on the effect of sub-lethal concentrations of zinc chloride (ZnCl2), cadmium chloride (CdCl2), and mercuric chloride (HgCl2) on Euglena are presented. During the growth cycle respiratory oxygen uptake and photosynthetic oxygen evolution in the light are initially strongly inhibited by Zn, Cd and Hg. The effects of the three metals on photosynthesis, using oxygen evolution as a criterion was confirmed by carbon fixation techniques. Photosystem I (PSI) associated electron transport 2,6-dichlorophenol indophenol (DCPIP)red. → methyl viologen (MV) → O2, in contrast to total photosynthetic capacity, was only slightly inhibited by Zn, Cd and Hg, whereas the levels of activity of NADP-oxidoreductase in cells untreated or treated with heavy metals showed development like total photosynthesis. Metals strongly inhibited this enzyme which means that the supply of NADPH is lowered due to the action of Zn, Cd and Hg. Photosystem II (PSII) associated electron transport (H2O → dibromothymoquinone/2,3-dimethyl-5,6-methylenedioxy-D-benzoquinone → O2), however, was severely inhibited in a way similar to total photosynthesis. Effects on the cooperation of PSI + II showed patterns similar to PSII alone, i.e., heavy metals strongly reduced PSI + II dependent activities.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 16 (1951), S. 363-363 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0931-1890
    Keywords: Key words Aluminium ; Carbon isotope ratios ; Cerrado ; Chlorophyll fluorescence ; Mistletoes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Chlorophyll a fluorescence parameters showing the instantaneous performance and carbon-isotope ratios reflecting long-term behaviour of leaves were determined for a large number of mistletoe/host-pairs in the cerrado belt of Brazil. Study sites were a very exposed rupestrian field, a semi-exposed savanna and a highly shaded gallery forest. The major question asked was if photosynthetic capacity of mistletoe leaves differed from that of the leaves of their respective hosts. It is shown that except for the very exposed rupestrian field site, photosynthetic capacity appeared to be similar in mistletoes and host leaves. The superior behaviour of host leaves in the rupestrian field was due to particularly expressed sun-plant characteristics of the host. However, mistletoes always had higher average stomatal conductances, lower leaf temperatures at similar or even higher irradiance and higher intercellular CO2-partial pressures than hosts. Photosynthetic performance of mistletoe leaves was independent of whether a given mistletoe species parasitized aluminium-accumulating or non-accumulating host species in the cerrados with their aluminium-rich soils.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0931-1890
    Keywords: Key words Acylesterhydrolase ; Heartwood formation ; Lipase ; Robinia pseudoacacia L. ; Phospholipases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  The radial profile of lipase and phospholipase activities was determined in the trunkwood of Robinia pseudoacacia L. The trees were felled in November at the time of heartwood formation and alterations in the enzymatic activities were investigated across the sapwood and heartwood. Methods employed include gaschromatographic, colorimetric and enzymatic assays. On a dry weight basis, the hydrolysis of the artificial substrate p-nitrophenylpalmitate shows a maximum activity in growth ring 4; however, the assay has proved not to be specific for lipase. In contrast, lipase analyses (triacylglycerol acylhydrolase; E.C. 3.1.1.3) with an authentic substrate show activity peaks in growth rings 1 and 4. With protein as a reference the highest activity is found in growth ring 5. A similar tendency is observed for phospholipase A1 (E.C. 3.1.1.32) and phospholipase A2 (E.C. 3.1.1.4). Phospholipase C (E.C. 3.1.4.3) activity decreases towards the sapwood-heartwood boundary; negligible traces of activity are detected in the heartwood, whereas, based on the protein content, growth ring 4 yields maximal activity. Phospholipase D (3.1.4.4) exhibits the same radial pattern with regard to protein content as a reference. On a dry weight basis there is a significant increase within the sapwood area, while in the heartwood the activity drastically decreases. The enzyme activities are discussed in relation to degradative processes within the plasma membranes and the hydrolysis of reserve lipids during heartwood formation.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0931-1890
    Keywords: Key words Cambial differentiation ; Glucose-6-phosphate dehydrogenase ; 6-Phosphogluconate dehydrogenase ; NAD kinase ; Pyridine nucleotides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Despite the importance of the vascular cambial differentiation, little is known about its regulation. In order to address this problem we attempted to biochemically characterize differentiating xylem and phloem elements during the early stages of development. By applying techniques of quantitative histochemistry we show that the total pool size of pyridine nucleotides is similar in the phloem (PD) and xylem (XD) oriented derivatives of the cambial zone of trees of Robinia pseudoacacia L. Within the PD zone, the amount of NAD + NADH exceeded that of NADP + NADPH [around 600 versus 200 pmol (mg dry weight)–1], possibly indicative of a preponderance of catabolic pathways (ratio of NADH : NAD about 1). In contrast, the NADP(H) system dominated in the XD zone. This coincided with a high activity of NAD kinase. In addition, the extractable activities of the key enzymes of the oxidative pentose phosphate pathway, glucose-6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase, were greatly increased. At a ratio of NADPH : NADP of approximately 1, this could be indicative of increased rates of reductive biosyntheses, and could thus well be involved in early steps of the formation of phenols and lignin monomers. Taken together, this first approach clearly shows that phloem-oriented and xylem-oriented cambial descendents exhibit distinct differences in their biochemical patterns even in early stages of differentiation.
    Type of Medium: Electronic Resource
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