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Biomedical subjects

N Levy

Publications and source records attributed to N Levy.

178 records · Page 10Linked to original sources
PubMedDate not supplied

Ulcerative colitis in pregnancy in Israel.

Sixty pregnancies in 31 ulcerative colitis patients were studied retrospectively. Twelve patients (20 per cent) improved, 11 (18.3 per cent) deteriorated, while in 37 (61.6 per cent) there was no change during pregnancy. Seven pregnancies (13.7 per cent) ended by spontaneous and two by artificial abortions. There were 50 full-term deliveries and one premature birth. Seven of the patients were treated with sulfasalazine; five were given steroids; and two, azathioprine. All gave birth to normal children. Of unplanned pregnancies 38.4 per cent were associated with activity of the disease versus only 12 per cent of planned gestations. Pregnancy does not seem to aggravate the course of pre-existing ulcerative colitis, nor does the colitis interfere with the outcome of the pregnancy.

Adolescent↗
PubMedDate not supplied

Distributed synchrony in a cell assembly of spiking neurons.

We investigate the formation of a Hebbian cell assembly of spiking neurons, using a temporal synaptic learning curve that is based on recent experimental findings. It includes potentiation for short time delays between pre- and post-synaptic neuronal spiking, and depression for spiking events occurring in the reverse order. The coupling between the dynamics of synaptic learning and that of neuronal activation leads to interesting results. One possible mode of activity is distributed synchrony, implying spontaneous division of the Hebbian cell assembly into groups, or subassemblies, of cells that fire in a cyclic manner. The behavior of distributed synchrony is investigated both by simulations and by analytic calculations of the resulting synaptic distributions.

Action Potentials↗
PubMedDate not supplied

Phosphoamino acid phosphatases in normal and cancerous tissues of the human uterus, cervix and ovary.

The activities of phosphoamino acid phosphatases were measured in human myometrium and fibroma and normal and cancerous tissues of the cervix and ovary. Phosphoserine and phosphothreonine phosphatases were detected only in myometrium and fibroma and the values were relatively low. Phosphotyrosine phosphatase activities in myometrium and fibroma fell within a similar range; this was also the case for ovary and ovarian carcinoma, whereas values for cervical tumours were significantly higher than for normal cervix. Activities of phosphotyrosine phosphatase in serum from patients with cervical or other tumours were, in most cases, within the range of values obtained for normal serum.

Cervix Uteri↗