Vitamin - a and limb regeneration in stages of the egyptian toad, bufo regularis Reuss-histological study

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contributor.author Michael, M. I. [ميلاد اسحق ميخائيل] en_US
contributor.author El-Mekkawy, Desouki A. en_US
contributor.author Sayed-Ahmed, Abdulla A. en_US
contributor.author Mahmoud, Gamal A. en_US
date.accessioned 2009-11-25T15:21:16Z en_US
date.available 2009-11-25T15:21:16Z en_US
date.issued 1995 en_US
identifier.citation Qatar University Science Journal, 1995, Vol. 15, No. 1, Pages 121-130. en_US
identifier.uri http://hdl.handle.net/10576/9906 en_US
description.abstract The histogenesis of regenerated limbs, of both control and treated /larvae/ with 30 I.U./ml of retinol palmitate for 3 days, was studied in two larval stages (viz. stages 53 & 54) of the anuran amphibian, Bufo regularis Reuss. Some histological changes took place in the amputated limbs of treated larvae in two phases: (a) during treatment and (b) after cessation of treatment and thereafter. In (a): the wound epidermal superficial layer became corrugated, basement membrane was not discernible, local haemorrhage was extensive and blastema call accumulation was inhibited. In (b): the epidermal surface maintained its irregularity for some days and contained numerous large vocuolated cells. Also, cells from the dedifferentiated stump tissues underwent active proliferation leading to the establishment of a large blastema, particularly in the case of the earlier stage. Cellular condensations in these blastemas were mostly unevenly distributed; they appeared more closely packed together posteriorly than anteriorly along the antero-posterior axis. Histological observations concerning blastema cells and theair active proliferation after cessation of treatment, were confirmed quantitatively through the blastema volume in both stages. en_US
description.abstract اختص هذا البحث بدراسة تاثيرفيتامين "ألما على تجدد الطرف الخلفي لطورين يرقيين للعلجوم المصري (برمائيات لاذيلية) وذلك بعمل فحرص نسيجية لكل من يرقات مجموعة ضابطة دس قات مجموعة معالجة بفيتامين "أ" (تركيز 30 وحدة دولية/ملليلتما لمدة ثلاثة أيام بعد البترعند منتسف المساق . ar
language.iso en en_US
publisher Qatar University en_US
subject Zoology en_US
subject علم الحيوان ar
title Vitamin - a and limb regeneration in stages of the egyptian toad, bufo regularis Reuss-histological study en_US
title.alternative فيتامين (أ) والتجد د الطرفي في أطوار العلجوم المصري ، بوفو رجيولارس ريوس - درا سة نسيجية ar
type Article en_US
identifier.pagination 121-130 en_US
identifier.issue 1 en_US
identifier.volume 15 en_US


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