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Biomedical subjects

O Tamir

Publications and source records attributed to O Tamir.

6 recordsLinked to original sources
PubMed2006

The impact of UV-B and sulphur- or copper-containing solutions in acidic conditions on chlorophyll fluorescence in selected Ramalina species.

Ramalina maciformis and Ramalina lacera were exposed to different solutions and UV-B to seek for alterations in the PSII photosynthetic quantum yield (F(v)/F(m)), in response to chemicals and radiation. For R. maciformis, significant alterations of the F(v)/F(m) ratio occurred only in response to different bisulphite solutions. The F(v)/F(m) ratio decreased most in R. maciformis and R. lacera following exposure to 5 and 1 mM bisulphite, respectively. Significant differences in F(v)/F(m) ratios were observed for R. lacera in response to different solutions and light at different wavelengths, this being synergistic. The PSII system was unaffected by simulated acid rain in both lichens. R. maciformis, in particular, may survive limited acid rain exposure owing to high Ca oxalate accumulation. The F(v)/F(m) ratio decreased most in R. lacera following short-term exposures to CuSO(4), suggesting that this species is more sensitive to Cu ions under acidic conditions.

Acid Rain↗
PubMed1992

[Incarcerated obturator hernia causing bowel obstruction].

Obturator hernia is rare and is usually discovered by chance at operation or autopsy. In certain cases obturator hernia may cause sliding and strangulation of abdominal viscera inside the hernial sac, presenting clinically as bowel obstruction. An 83-year-old woman with signs of bowel obstruction was operated after 48 hours of conservative treatment and a small bowel loop was found strangulated inside the sac of an obturator hernia.

Aged↗
PubMed1990

[Multiple enteral fistulas in peritoneal tuberculosis].

A 40-year-old Ethiopian man had abdominal pain for a year and a half, diarrhea and weight loss. Multiple enteral fistulas were diagnosed by X-ray and colonoscopy. During investigation, the differential diagnosis was between Crohn's disease, intestinal lymphoma and intestinal tuberculosis. Therapeutic trial with corticosteroids was unsuccessful. At operation peritoneal tuberculosis was diagnosed and several entero-enteric fistulas were found, but there were no other intestinal lesions nor other foci of tuberculosis. Intestinal fistulas complicating peritoneal tuberculosis are rare in comparison with enteral tuberculosis, lymphoma or Crohn's disease. After the fistulas were closed surgically and antitubercular treatment given, the patient recovered, returned to his normal weight, and had no complaints.

Adult↗
PubMedDate not supplied

Photosynthesis, chlorophyll integrity, and spectral reflectance in lichens exposed to air pollution.

The major objective of the present study was to identify the relationship of physiologial parameters of the photosynthetic system with the elemental content of the lichen Ramalina lacera (With.) J.R. Laund. Thalli of R. lacera were collected in an unpolluted site and transplanted in a national park and an industrial region in Israel for 8 mo. Analyses of photosynthetic activity, chlorophyll integrity, spectral reflectance, and amount of 11 metals were performed after this period of exposure. The normalized difference vegetation index (NDVI), indicative of the spectral reflectance response of the thallus, correlated with photosynthetic rate and chlorophyll and K content and correlated inversely with amounts of Ba, Cr, Cu, and Ni. The NDVI appears to enable the detection of early signs of pollutant-induced stress before changes in other physiological parameters become apparent. Elevated amounts of Cr, Cu, Fe, Mn, Ni, and Zn in lichens transplanted to an industrial area and the correlation of Mn and Ni, Mn and V, Ni and V, Fe and Mn, Fe and V, and Fe and Zn point for the greater part to metal processing in a steel smelter. Correlations of Cr and Ni, Cu and Ni, Zn and Cu, Cu and Mn, and Zn and Ni could be related to metal processing in the industrial area but indicate also vehicular activity as a possible originator.

Air Pollution↗