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Biomedical subjects

V Samaras

Publications and source records attributed to V Samaras.

5 recordsLinked to original sources
PubMed2005

Cadmium uptake by tobacco as affected by liming, N form, and year of cultivation.

Tobacco is able to accumulate cadmium and reduction of cadmium content can reduce health hazards to smokers. Soil pH and form of N fertilizers are among the factors affecting Cd uptake by tobacco. This hypothesis was tested in an acid soil in northern Greece by a four year field experiment. The variability of Cd uptake by tobacco was attributed to the variation of soil Cd availability as affected by soil pH. Liming with 3000 kg Ca(OH)(2) ha(-1) increased soil pH by 0.8 units and decreased extractable with DTPA soil and leaf Cd by 40% and 35%, respectively. The ammonium fertilizer caused the opposite, but weaker, effects. Liming reduced soil Cd more in the ammonium treatment than in nitrate or combined N treatments. The year of cultivation strongly affected soil and leaf Cd. Four years after tobacco cultivation, soil pH was reduced by 0.5 units, whereas soil and leaf Cd reduction was more than 60% in the limed treatments. Liming affected Cd uptake only in the first three years of cultivation.

Agriculture↗
PubMed1987

Calcitonin concentrations in lung cancer and non-malignant pulmonary diseases.

The serum immunoreactive calcitonin (ICT) concentration was estimated in 107 patients with lung cancer of various cell types, 46 normal subjects and 24 non-cancer patients with various pulmonary diseases. Eighty-one of the cancer patients had localized lung cancer and the rest 26 primary lung cancer with metastases to other organs. The ICT was found significantly increased in the lung cancer patients. The highest ICT values were found in patients with lung cancer and metastases to other organs, especially to the liver. In localized disease, patients with small-cell carcinoma of the lung showed the highest, while those with adenocarcinoma and squamous-cell type demonstrated the lowest ICT concentrations. In 46 patients with lung cancer, serial determinations of serum ICT levels showed significantly decreased calcitonin levels in the patients who responded well to therapy with cytostatics, X-rays or both after more than 2 months of therapy. Fluctuations of ICT levels were in agreement with the regression or progression of the disease.

Aged↗
PubMed1978

[Angioscintigraphy of the aortic arch and the origin of the cerebral vessels in cerebro-vascular diseases (author's transl)].

Gamma-angioscintigraphy of the cerebral vessels starting from the aortic arch localises better the level of an eventual vascular lesion preventing a "false positive" aspect, possible by the usual technique as in the case reported. By starting the examination at the level of the aortic arch or by the use of a diverging collimator it is easy to decide of the necessity of an angiographic study, simple carotidography or angiography of the aortic arch and its branches.

Aorta, Thoracic↗