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Plum plants were regenerated from hypo-cotyl segments derived from the embryonic axes of ungerminated seeds stored for up to six months at 4°C. Shoots were produced in 45 percent of the explants with an average of 8 shoots per explant. This regeneration system was used for Agrobacterium-mediated transformation with plasmids containing genes for neo-mycin(More)
Caffeine is a competitive antagonist at adenosine receptors. Receptor up-regulation during chronic drug treatment has been proposed to be the mechanism of tolerance to the behavioral stimulant effects of caffeine. This study reassessed the role of adenosine receptors in caffeine tolerance. Separate groups of rats were given scheduled access to drinking(More)
Shoots were regenerated from the proximal region of immature cotyledons (with the embryonic axis removed) of Prunus persica (peach) and from the same area in mature cotyledons of P. domestica (plum) and P. cerasus (sour cherry) on MS medium containing (in mgl-1) thiamine-HCl, 0.4; nicotinic acid, 0.5; pyridoxine-HCl, 0.5; sucrose, 25 000; and 0.7% agar. The(More)
Peach leaf segments, immature embryos, and long-term embryogenic calli have been transformedin vitro with the engineeredAgrobacterium tumefaciens strain A281 containing pGA472. All three tissue sources proliferated callus which grew on a medium containing 100–200 mg/l kanamycin or 10–20 mg/l G-418 as selective agents. These calli were shown to produce(More)
Cultures were propagated from apical meristem slices of Musa textilis plants. They were cultured in vitro in light on either MS medium containing BAP (10 mg/l), but without edamin or MS mineral salts supplemented with 100 mg/l each of inositol, tyrosine, ascorbic acid; 150 mg/l citric acid; 2 mg/l cysteine; 0.4 mg/l thiamine HCl; 3% sucrose and 0.5–0.8%(More)
Mature soybean cotyledons (Maturity group VII) were cultured on modified MS containing 0–2.5 μM indole-butyric acid (IBA); 0–10 μM 6-benzylaminopurine (BAP) and 0.7% agar. Embryonic axes of explants were removed prior to culture initiation and cultures were incubated at 24°C with 45–50 μE. s−1.M−2 of mixed irradiance with 16 h photoperiod. Shoot(More)
Caffeine potently inhibited forskolin-stimulated cyclic AMP accumulation in slices of rat cerebral cortex, with an IC50 of 21 +/- 3 microM. Because caffeine competitively blocks adenosine receptors, we examined whether the action of forskolin involved endogenous adenosine or whether caffeine was acting through some novel mechanism. Inhibition by caffeine(More)
A chemically reactive prazosin analog (SZL 49) has been suggested to be an alpha 1A-selective alkylating agent. We found SZL 49 competed for alpha 1-adrenoceptor binding sites with a similar potency (IC50 1 nM) in tissues enriched in both the alpha 1A (hippocampus) and alpha 1B (liver) subtypes. SZL 49 was very difficult to wash out of membrane(More)