Dieter Gross

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This review includes novel natural products of microbial and plant origin reported to exert plant growth-regulating activities. The well-known “classic” plant hormones are excluded. The substances described with their biological activities are restricted to those that have been isolated from microbial or plant sources later than 1990 or that have been(More)
We report on charge separation between type II aligned CdTe and CdSe nanocrystals. Two types of electrostatically bound nanocrystal structures have been studied: first, clusters of nanocrystals hold together by Ca(II) ions in aqueous solution and, second, thin film structures of nanocrystals created with layer-by-layer deposition in combination with(More)
Nanoscale materials will play an important role in the development of future devices and applications. Among these materials, semiconductor nanocrystals (NCs) are attracting increasing interest due to their relatively easy preparation and the striking properties determined by quantum confinement. There are several examples of the use of NCs in biological(More)
This paper presents results from measurements of viscosity of suspensions of Yttrium Oxide Y2O3 ceramic nanopowder in ethyl alcohol. The study was conducted at the request of and in cooperation with the ICMB. This research will add important information about the formation and viscosity characteristics of suspensions of nanopowders. The behavior of(More)
Jasmonic acid [(l^?5',27?5')-3-oxo-2-(2Z-pentenyl)cyclopentane-1-acetic acid] (4)* (Fig. 1) and its methyl ester are not only important substances in perfumery but the (-)-enantiomer of 4 and (-)-methyl jasmonate are also known to be endogenous plant growth regulators, widely distributed within the plant kingdom, and possessing phytohormone like properties(More)
The biotransformation of [2-14C](±)9, 10-dihydrojasmonic acid (DJA) was studied in excised shoots of 6-day-old barley seedlings after 72 h. From the ethyl acetate extract, some minor metabolites were isolated and purified by DEAE-Sephadex A-25 chromatography, thin-layer chromatography (TLC), C18-cartridges, and high-performance liquid chromatography (HPLC).(More)
Charge separation and diffusion in type II multilayered structures of CdTe and CdSe nanocrystals with a polymer spacer are unambiguously proven by surface photovoltage spectroscopy. Holes accumulate in CdTe nanocrystal layers, and the electrons in CdSe nanocrystal layers. An increase of thickness of the polymer spacer strongly decreases the charge(More)
Phytoalexins accumulated in selected woody plants in response to microbial attack or stress are reviewed and listed with respect to their chemical structure and probable biogenetic origin. The host-pathogen systems from which they have been isolated are described. The review also considers the antimicrobial activity of the phytoalexins to the causal(More)
Nuclear magnetic resonance (NMR) microimaging is a noninvasive and nondestructive technique that has great potential for the study of soil processes. Hydrogen-1 NMR microimaging techniques were used to examine the distribution of water in four different soil cores. Fluorine-19 NMR microimaging is also used to study the transport of three model contaminants(More)
Aus der Kenntnis der vaskulären Ordnung der Körperoberfläche und der peripheren Organisation des Sympathicus ergibt sich zunächst die Möglichkeit, die hyperalgetischen ZonenHeads in diese einzuordnen. Es zeigen sich neue diagnostische Wege und eine Basis für die gesamte physikalische Therapie. Für eine gezielte Anästhesietherapie ergeben sich klinische(More)