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Biomedical subjects

F A Ahmed

Publications and source records attributed to F A Ahmed.

8 recordsLinked to original sources
PubMed1997

The termination of optic nerve fibers in the albino mouse.

To establish the terminal sites of the optic nerve fibers in the albino mouse, the immunohistochemical method using cholera toxin, subunit B (CTB), as well as three kinds of selective silver impregnation methods for degenerating nerve fibers were used. Termination was confirmed in the following nuclei: bilateral dorsal nuclei of the lateral geniculate body (LGB), ventral nuclei of LGB, preoptic areas, posterolateral nuclei, superior colliculi, suprachiasmatic nuclei, medial terminal nuclei of the accessory optic tract (AOT), and dorsal terminal nuclei of AOT. The percentage of the optic nerve fibers crossing at the optic chiasm was estimated at 90 to 95. Fibers from the unilateral retina were observed to terminate more in the contralateral nucleus. With regard to the suprachiasmatic nucleus, however, the terminations were observed to be distributed evenly and bilaterally.

Animals↗
PubMed1996

Fluoro-Green and Fluoro-Red: two new fluorescent retrograde tracers with a number of unique properties.

As a means of improving nerve tract-tracing in the peripheral and central nervous systems we experimented with two (retrograde) fluorescent emulsions, which we have tentatively named Fluoro-Green (FGr) and Fluoro-Red (FRe), and which we believe possess the following seven advantages: (1) they show little diffusion beyond the injection site; (2) their excitation/emission characteristics allow their use in double-tracing experiments; (3) they do not 'leak' from labeled cells; (4) their fluorescence is presented as large granules in the cytoplasm and its processes; (5) the fluorescence lasts for a sufficiently long time to permit repeated observation; (6) they may be used in combination with a wide variety of other neuroanatomical tracing methods; (7) they are economical, non-toxic and easy to utilize.

Animals↗
PubMed1993

Esophageal cancer in Qatar.

There were 41 cases of esophageal cancer over a 7 years period in the State of Qatar. Qataris accounted for 30 (73.17%) of these cases while representing about 38% of the entire population. Also there is a slight preponderance of female cases especially among Qataris. Nutritional factors, dietary preferences, environmental factors, social status and habits as well as genetic factors may constitute important etiologic factors in the genesis of esophageal cancer in Qatar.

Adenocarcinoma↗
PubMed1989

Growth effects, uptake and metabolism of trifluralin in tissue cultures.

Growth effects, uptake and metabolism of trifluralin (alpha, alpha, alpha-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) in carrot (Daucus carota L.) and tobacco (Nicotiana tabaccum L.) callus tissue were determined. Carrot callus was initiated from tap root tissue on Murashige and Skoog medium with kinetin and 2,4-dichlorophenoxy acetic acid (2,4-D). Tobacco callus was initiated from pith tissue on Murashige and Skoog medium with indole-3-acetic acid (IAA) and kinetin.

Culture Techniques↗
PubMed1989

Effect of yohimbine on xylazine-induced diuresis in rats.

Intraperitoneal (ip) administration of xylazine (1-6 mg/kg) in male rats significantly increased urine flow over a 2-hr period in a dose-dependent manner, while urine osmolality was significantly decreased. Xylazine at 4.5 and 6 mg/kg significantly increased sodium excretion, whereas the 3 and 6 mg/kg doses of xylazine significantly increased potassium excretion. Yohimbine injected ip at 0.5 or 1 mg/kg 15 min before xylazine (6 mg/kg, ip) significantly decreased urine flow by 44% and 64% respectively. Yohimbine also prevented the increase in sodium and potassium excretion induced by xylazine. The data indicate that yohimbine is of value in controlling the diuretic effect of xylazine in rats.

Animals↗
PubMed1986

Binge stroke. A case report.

Cerebral infarction developed in a 33-year-old normotensive coloured male after an alcoholic binge. This sequence of events has been described in Scandinavia and may occur in southern Africa more often than is realized.

Adult↗
PubMed1983

Intake and digestibility of berseem (Medicago sativa) and Sorghum Abu 70 (Sorghum vulgare) forages by Sudan zebu cattle and desert sheep.

Two experiments were carried out with Sudan zebu cattle and desert sheep to study the voluntary intake and digestibility of berseem (Medicago sativa) and Abu 70 (Sorghum vulgare) forages when offered ad lib. alone and with supplements of molasses to the cattle and dura grain to the sheep. In both experiments the intake of berseem was significantly higher than Abu 70. Supplementation increased Abu 70 intake and while molasses significantly increased berseem intake by cattle, dura decreased its intake by sheep. On the basis of metabolic body size sheep showed a higher intake of these forages than cattle. There was no significant difference in DM digestibility between berseem and Abu 70 by cattle. Sheep digested berseem significantly better than Abu 70. Molasses and dura significantly increased the digestibility of Abu 70 by cattle and sheep but had no significant effect on the DM digestibility of berseem.

Animals↗