Showing papers by "Leibniz Association published in 1991"
TL;DR: Conclusions on the location of functionally important sites of eukaryotic small ribosomal subunits are discussed with regard to the respective location of these sites in the prokaryotic counterpart.
66 citations
TL;DR: A new 3,28-bidesmosidic triterpenoid saponin was isolated from the leaves of Schefflera octophylla together with a new trisaccharide and oleanonic acid.
27 citations
TL;DR: The secretion and in situ removal stimulates anthraquinone production in cell cultures of Galium vernum, and best results were obtained with Wofatit ES and Amberlite XAD-2.
Abstract: Anthraquinones produced by suspension cultures of Galium vernum are completely retained intracellularly. Surprisingly, in the presence of some polymeric adsorbents anthraquinones are partially released into the culture medium. The secretion and in situ removal stimulates anthraquinone production in cell cultures of Galium vernum. Best results were obtained with Wofatit ES and Amberlite XAD-2.
25 citations
TL;DR: The semi-dwarfing gene Rht8 seems to promote only a minor effect, but the day-length sensitive allele ppd1 determined a major increase in callus growth and regeneration ability.
Abstract: The influence of genes affecting the ‘plant growth habit’ in wheat (Rht8 and Ppd1) and rye (ct1 and ct2) on tissue culture response was studied using immature embryos. Whereas the semi-dwarfing gene Rht8 seems to promote only a minor effect, the day-length sensitive allele ppd1 determined a major increase in callus growth and regeneration ability. With regards to their tissue culture efficiency, the four alleles studied could be ranked as follows: ppd1>Rht8>rht8>Ppd1. In contrast to wheat, the GA insensitive semi-dwarfing genes of rye (ct1 and ct2) appear not to influence in vitro response.
24 citations
TL;DR: For the first time rutacridone accumulation was stimulated either by a yeast, Phytophthora or Colletotrichum elicitor, and an elicitor-mediated induction of 5-adenosyl-L-Methionine: anthranilic acid N-methyltransferase, N-methylanthranilic Acid «activating» enzyme and rutACridone synthase was recorded.
15 citations
Journal Article•
11 citations
TL;DR: Two new withanolides were isolated from roots of Dunalia australis from physical data and chemical transformations and the structure of both constituents was determined as (20 S ,22 R )-1α-acetoxy-3β-hydroxy-witha-5,24-dienolide and (20 R,22 R)-3 β- acetoxy-1 α,12β,20-trihydroxyphenolide.
9 citations
TL;DR: In this paper, the authors studied the nonlinear quantum dynamics of the simultaneous transfer of two electrons in a molecular chain and derived a set of nonlinear rate equations which take into account the shift of the electronic site energies due to the mutual Coulomb interaction.
6 citations
1 citations
TL;DR: In this paper, high resolution and analytical transmission electron microscopy (TEM) and X-ray diffraction (XRD) were used to characterize short-period strained-layer Sim-Gen superlattices.
Abstract: High resolution and analytical transmission electron microscopy (TEM) and X-ray diffraction (XRD) were used to characterize short-period strained-layer Sim-Gen superlattices ( m monolayers Si, n monolayers Ge, total number of periods N≤ 145, total thickness ≃ 200 nm). The superlattices were grown by low-temperature molecular beam epitaxy (T = 300–400°C) on different SiGe alloy buffer layers on Si (100)substrates. The combination of these two methods shows that detailed informations can be obtained about superlattice periodicity, interface roughness, strain, and average composition.