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Biomedical subjects

A L Levin

Publications and source records attributed to A L Levin.

18 recordsLinked to original sources
PubMed1989

Surgical management of unresectable retroperitoneal leiomyosarcomas.

Retroperitoneal leiomyosarcomas are rare tumors with a poor prognosis. These tumors are often deemed unresectable because of their large size when diagnosed. This study presents two recent patients who show that retroperitoneal leiomyosarcomas can be resected successfully. Adjuvant radiotherapy is useful in treatment of patients with residual disease. Although the contribution of chemotherapy in prophylaxis and treatment of these tumors remains undefined, various chemotherapeutic regimens are currently under investigation.

Aged↗
PubMed1985

A model of corneal re-endotheliazation after surgical trauma.

A model for simulating the endothelial damage caused by surgery is described. The model consists of the introduction of a specially constructed instrument into the anterior chamber and using it for scraping the endothelium of a pre-determined, precisely quantifiable area of cornea. The process of healing of the scraped cornea can be followed and measured accurately by biomicroscopy, specular microscopy and histological techniques. The model can be used to study the qualitative and quantitative aspects of endothelium healing and the effects of the various endogenous, exogenous and iatrogenic factors on this process. The preliminary data presented shows that the healed endothelium consists of larger and less densly packed cells. The cell density is reduced by 43.3% after one scraping of 57% of the endothelium and by 69.2% after two such operations. Prolonged mild traumatic iritis causes the appearance of endothelial cells with incongruous shapes.

Animals↗
PubMedDate not supplied

[Stationary models of primary converters for electrochemical analyzers of dissolved oxygen].

Stationary models were obtained of dissolved oxygen primary converters with cathodes having flat and semispherical shape. After analysing these models a proper approach was provided to the exposure of functional possibilities, and feasibilities of their operation in preset conditions were formulated. It was shown that, in principle, it is possible to define the oxygen concentration in liquid media and such characteristics of oxygen transport as the diffusive conductivity and specific oxygen flow. The results obtained were checked experimentally by determination of oxygen content and showed their satisfactory fitness.

Electrochemistry↗