نتایج جستجو برای: swim bladder
تعداد نتایج: 61846 فیلتر نتایج به سال:
Several times throughout their radiation fish have evolved either lungs or swim bladders as gas-holding structures. Lungs and swim bladders have different ontogenetic origins and can be used either for buoyancy or as an accessory respiratory organ. Therefore, the presence of air-filled bladders or lungs in different groups of fishes is an example of convergent evolution. We propose that air bre...
هدف از انجام این مطالعه ، بررسی اثر ros درون سلولی اسپرم بر روی پارامترهای کلاسیک ، شکست (df) dna، تغییرات پتانسیل غشا میتوکندریmmp) )، مرگ سلولی ( (apoptosisبا استفاده از تکنیک فلوسایتومتری و ارتباط آن با میزان لقاح و مورفولوژی جنین ها در مردان نابارور کاندید درمان تزریق درون سیتوپلاسمی (icsi) بود. بدین منظور 28 نمونه منی افراد normospermic و 62 نمونه منی بیماران کاندید icsi از زوج های نابارور...
Cytostatics are compounds used in chemotherapy, known to be genotoxic, mutagenic, and teratogenic at low concentrations. The amount of cytostatic drugs prescribed increases every year as does their release into the aquatic ecosystems, which possibly is a major concern for health organisms. This study aimed evaluate putative toxicity five cytostatics fathead minnow (Pimephales promelas) larvae: ...
The current research was conducted with the aim to investigate rate of chromium accumulation in various tissues commercially valuable freshwater fish, Grass Carp, Ctenopharyngodon idella. Investigation included skin, muscles, liver, swim bladder, intestine, and gills fish. For this purpose, fish were exposed sub lethal concentration hexavalent form potassium dichromate a dose 120 mg/L for 40, 2...
My research has been devoted to neuromuscular control of sound production in toadfish, catfish, and other species along with an occasional foray into hearing. Toadfish utilize a heart shaped swim bladder superfast muscles small fibers unusual ultrastructure. Both sonic motor neurons muscle increase size number for multiple years, large fragment likely divide, maintaining energetic efficiency. d...
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