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  • 1
    Electronic Resource
    Electronic Resource
    Water droplets in intercellular spaces of barley leaves examined by low-temperature scanning electron microscopy (1985)
    Springer
    Planta 166 (1985), S. 335-340 
    Details
    ISSN: 1432-2048
    Keywords: Apoplast ; Evaporation sites (leaf) ; Intercellular space ; Hordeum (apoplasmic water) ; Leaf (apoplasmic water) ; Water (apoplasmic, leaf)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Low-temperature scanning electron microscopy was used to examine fracture faces in leaf blades taken from well-watered or drought-stressed barley (Hordeum vulgare L. cv. Mazurka) seedlings. The leaf blades were freeze-fixed while hydrated and were examined with or without gold-coating. There were ‘droplets’ (with a smooth surface at the resolution achieved) on the surface of cell walls in leaf blades (0.91 g-1 water content) from well-watered seedlings grown in an environment of 67% relative humidity. These were mainly on the vascular bundle sheath, the guard and subsidiary cells, and on some mesophyll cells around the substomatal cavity and between the stoma and vascular bundle. The droplets occurred, more abundantly, in the same places in seedlings from 100% relative humidity. They occurred on a few guard cells from wilting leaf blades (0.81 g·g-1 water content) and were absent from severely drought-stressed leaf blades (0.15 g·g-1 water content). The droplets sublimed at the same moment as both water which was in leaf cells and water which was allowed to condense (after freeze-fixation) on the wall surface. It is suggested that the droplets are aqueous. Their possible origin and importance is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401170
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  • 2
    Electronic Resource
    Electronic Resource
    Identification and quantitative analysis of phendimetrazine and some of its metabolites in biological fluids (1986)
    Springer
    Monatshefte für Chemie 117 (1986), S. 1047-1055 
    Details
    ISSN: 1434-4475
    Keywords: Amphetamins ; Anorectics ; Antiobesity ; CNS stimulants ; Phendimetrazine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Nach oralen Dosen von Phendimetrazin an Menschen wurde im Harn unverändertes Phendimetrazin, der N-demethylierte Metabolit, Phenmetrazin und das N-Oxid von Phendimetrazin, nicht jedoch N-Hydroxyphenmetrazin gefunden; die Metaboliten wurden mittels TLC und GLC identifiziert. Die Stabilität von Phendimetrazin und dessen Metaboliten wurde in biologischen Flüssigkeiten und in Ether untersucht. Es wurde eine gaschromatographische Methode für die quantitative Bestimmung von Phendimetrazin, seinem N-Oxid und Phenmetrazin in Harn, Plasma und Speichel entwickelt, wobei das N-Oxid vor der Analyse reduziert wurde.
    Notes: Abstract In urine, after oral doses of phendimetrazine to man, were found unchanged drug, the N-demethylated metabolite, phenmetrazine, and the N-oxide of phendimetrazine, but not N-hydroxyphenmetrazine; the metabolites were identified using t.l.c. and g.l.c. The stability of the drug and its metabolites in biological fluids and in ether was studied. A gas chromatographic procedure for the quantitative determination of unchanged drug, its N-oxide and phenmetrazine in urine, plasma and saliva was developed, the N-oxide being reduced before analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811275
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    Paper (German National Licenses)
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