Johannes Gleitz

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Two cell lines of carrot (Daucus carota L. spp. sativus), grown as cell-suspension cultures in the dark, were irradiated with ultraviolet light (315–420 nm) 10 d after the onset of cultivation. Chalcone synthase (CHS) enzyme activity was induced in both cell lines. Anthocyanin synthesis was only stimulated in the anthocyanin-containing cell line DCb.(More)
Extracts of the plant Aconitum spec. are used in traditional Chinese medicine predominantly as anti-inflammatory and analgesic agents, the latter allegedly equally potent as morphine but without any habit-forming potential. As the only pharmacologically active compounds, the C19 diterpenoid alkaloid aconitine, and some of its derivatives, have been proven(More)
A method is described for the on-line detection of L-(+)-lactate released from brain vesicles under physiological conditions. The principle of L-lactate detection is based on the reversible oxidation of L-lactate catalysed by L-lactate dehydrogenase (LDH, EC employing 3-acetylpyridine-adenine-dinucleotide (APAD) as analogue of NAD according to the(More)
Kava pyrones are pharmacologically active compounds extracted from Piper methysticum Forst. Because kava pyrones were characterized by their anticonvulsive, analgesic and centrally muscle relaxing action, we investigated the influence of (+/-)-kavain, a synthetic kava pyrone, on veratridine-stimulated increase in intrasynaptosomal Na+ concentration ([Na+]i)(More)
The accumulation of anthocyanins in cell cultures of Daucus carota L. and the enzymes involved in their biosynthesis were investigated under growth in the dark, continuous irradiation with UV light, incubation with elicitors from Pythium aphanidermatum, and elicitor treatment of UV-irradiated cells. Upon UV irradiation, anthocyanin accumulation was strongly(More)
The effect of aconitine, an alkaloid neurotoxin known to bind at site 2 of the sodium channel, was investigated on epileptiform activity in hippocampal slices by use of extracellular recordings in CA1 pyramidal cell layer. Epileptiform activity was induced by bicuculline, picrotoxin, penicillin, pentylenetetrazol or by omission of magnesium from the bathing(More)
Extracts of St. John's wort, Hypericum perforatum L. (Hypericaceae), are used as a phytotherapeutic antidepressant. A number of clinical studies demonstrate that their antidepressive potency is comparable to tricyclic antidepressants (TCA). Although the therapeutic effect of hypericum extracts is well documented, very little is known about the molecular(More)
Synaptosomes of rat cerebral cortex were used to study the effect of veratridine-induced Na+ load on postanoxic recovery of respiration and on aerobic and anaerobic ATP turnover, calculated from rates of oxygen consumption and lactate production. Non-stimulated synaptosomes: after onset of anoxia lactate synthesis of synaptosomes rose immediately from 0.8(More)
Alkaloids of Aconitum spec. (Ranunculaceae) are employed in traditional Chinese folk medicine as analgesics. The present study was designed in order to investigate the effects of the structurally related alkaloids aconitine, lappaconitine, and 6-benzoylheteratisine on experimentally induced epileptiform activity. Experiments were performed as extracellular(More)
Neutral chlorothiophenecarboxamides bearing an amino acid and a substituted aniline were synthesized and investigated for their factor Xa inhibitory activity in vitro. From selected 2-methylphenyl morpholinones the solution properties were determined. The most soluble and active compounds were then investigated in different animal species to compare the(More)