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Biomedical subjects

G Bäcker

Publications and source records attributed to G Bäcker.

4 recordsLinked to original sources
PubMed1979

In vitro studies on GABA release.

1 Recent studies have demonstrated growing evidence for a primary action of the benzodiazepines on gabaminergic neurones which induces a facilitation of gamma-aminobutyric acid (GABA)-mediated neurotransmission. As enhancement of GABA release has been suggested to account for their activation of GABA mechanisms, the effect of diazepam and clobazam, and of several other psychotropic drugs, on stimulated GABA release have been studied. 2 Using rat brain cortex slices saturated with [3H]-GABA, the electrically stimulated overflow of GABA is reduced in a concentration-dependent manner in the presence of both diazepam and clobazam. 3 The benzodiazepine-induced reduction in GABA overflow during electrical stimulation is antagonized by the GABA receptor blocker bicuculline, whereas bicuculline alone at 10(-6) M concentration does not change the overflow. 4 Among some other centrally active drugs tested, hexobarbitone and the 'second messenger; cyclic GMP also induce a significant but less marked reduction in GABA release. 5 A schematic model of a central gabaminergic synapse is proposed, which may explain the benzodiazepine effects on stimulated GABA release by suggesting an inhibitory feedback control of transmitter release mediated by presynaptic GABA receptors ('autoreceptors').

Animals↗
PubMed1978

[Working conditions and job-requirement of older industrial blue collar workers and the consequences in employment problems (author's transl)].

In the following passage the reduced vocational capacity of older workers will be discussed as a consequence of the intended high-capacity of workers as well as the non--human working--conditions in industry. The reduced personal sanity and working capacity of older workers point out the high rate of handicaps and the incapacity of vocational engagement. Problems of employment--and this could be pointed out by the high rates of unemployment amongst older workers--does not signify prejudice but indicates the low profitableness of older workers in the capitalistic production system. Finally discussed will be the contribution of a monetary--conpensatoric against a more prophylactic social policy for a better solution of the vocational problems of older blue-collar workers.

Age Factors↗
PubMed1977

Studies on brain metabolism of biogenic amines.

1. In vitro models (synaptosones, electrically stimulated brain slices and monoamine oxidase (MAO) preparations have been used to identify the sites of action of nomifensine on brain monoamine metabolism. 2. Nomifensine potentiates neurotransmission in noradrenergic and dopaminergic synapses by blocking catecholamine uptake. 3. Nomifensine does not inhibit MAO and does not enhance the release of biogenic amines. 4. Studies on electrically stimulated brain slices suggest that nomifensine does not directly stimulate dopamine (DA) nor noradrenaline (NA) receptor sites. 5. 5-Hydroxytryptamine (5-HT) uptake is not inhibited at "therapeutic" concentrations of nomifensine. 6. Nomifensine differs from the tricyclic antidepressants by virtue of its effect on the dopaminergic system.

Animals↗