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Biomedical subjects

G Kamel

Publications and source records attributed to G Kamel.

At least 37 records · Page 2Linked to original sources
PubMed1998

Pulmonary development in the fetal one-humped camel: morphometry.

The structural development of the fetal camel lung is described and quantified morphometrically in this report. During fetal development the lung weight and volume increased polynomially with body length. The correlation coefficient between lung weight and body length is +0.991, and between lung volume and body length is +0.995. Volume density of the future bronchial tree showed a progressive increment with gestational age and is relatively higher in male than female fetuses, and the differences are statistically significant at 340-420 mm CRL. The proportion of lung tissue occupied by saccular airspaces increased enormously during the canalicular and alveolar stage, and the differences between both sexes are statistically significant at the former stage. The number of alveoli per unit area correlates closely with body length (r = +0.928) and the correlation coefficient between alveolar diameter and body length is +0.991. On the other hand, the correlation coefficient between the number of alveolar ducts per unit area and body length is -0.993, and is about +0.977 between the diameter of alveolar ducts and body length.

Aging↗
PubMed1998

Surface ultrastructure of fetal bronchial epithelium in camel.

The surface ultrastructural features of fetal camel bronchial epithelium were studied at various stages of development. The bronchial epithelium in fetuses of 90-280 mm crown-to-rump length (CRL) presented a large number of disintegrating sloughed epithelial cells and a few ciliogenic cells at different stages of ciliary differentiation. The disintegrating cells had vacuolated electron lucent cytoplasm, which contained variable amounts of glycogen, swollen mitochondria, strands of dilated rough endoplasmic reticulum and irregular pyknotic nuclei. They were joined by a distorted junctional complex at their luminal ends. From 330-480 mm CR length fetuses, the disintegrating sloughed cells of the bronchial epithelium of camel lung were relatively fewer than those observed at the previous fetal stage. On the other hand, the non-ciliated microvilli-covered cells and the ciliogenic cells were increased in number. On reaching 500-560 mm CR length, the disintegrating sloughed cells had completely disappeared from the bronchial surface, and the lining epithelium was characterized by the presence of abundant ciliogenic cells at various stages of differentiation. Towards 570-700 mm CR length, most of the bronchial surface cells underwent ciliogenesis. From 830 mm CRL up to term, the bronchial epithelium demonstrated ciliated and non-ciliated microvilli-covered cells, together with some cells possessing microplicae at their apical surface.

Animals↗
PubMed1993

Population dynamics and schistosomal infection of Biomphalaria alexandrina in four irrigation canals in Egypt.

The natural growth, reproductivity, mortality and schistosomal infection of Biomphalaria alexandrina, the snail vector of Schistosoma mansoni in Egypt, were studied for one year in four irrigation canals, namely El-Khassa and Radwan (Giza Governorate) and Sendebis and Sanafeer (Qalyoubiya Governorate). Radwan canal contains a considerably dense Biomphalaria population and three generations of snails (parents generation and autumn and spring generations) were recognized. Two phases of growth were distinguished in both autumn and spring generations, a faster phase followed by a slower one. The faster phase extends from January to May and from March to August in the autumn and spring generations, respectively. The daily mortality rate of snails was highest in the hot season (June--September) and lowest in the cold months (December--April). Continuous reproductivity of Biomphalaria snails was observed allover the year with highest values of reproduction index from November to March. Biomphalaria snails collected from El Khassa and Radwan canals were free of S. mansoni infection, while snails of Sanafeer canal carried patent infection in September and October. Prepatent infection was also found in Sanafeer canal in July and September and in Sendebis canal in September.

Animals↗
PubMed1993

Ecology of Biomphalaria alexandrina the snail vector of Schistosoma mansoni in Egypt.

The patterns of spreading and seasonal variation of population density of Biomphalaria alexandrina, the snail vector of Schistosoma mansoni in Egypt, in correlation with some environmental parameters were studied for 1988-1990 in four irrigation canals in Giza and Qalyoubiya Governorates. Results shown that the spreading patterns of snails along canals are changeable because of water current and irrigation activities. The snail population density showed two peaks, different in height, in April-May and November-December separated by two bottoms following the Winter Closure and during the hot summer season. The height of the peaks appears to be dependent on the extent of the "Winter Closure" and the prevailing water temperature. Two snail sampling tools, the dip-net and drag scoop, were used concurrently in this study. No considerable difference in sampling efficacy was recognized between these tools in the case of Biomphalaria. However, the dip-net appears to be more efficient in sampling other pulmonates while the drag scoop is more efficient in sampling prosobranchs. It is also realized that double sampling of 50% of sampling sites the next day should be satisfactory as a quality control system in snail population studies.

Animals↗