نتایج جستجو برای: dasyatidae
تعداد نتایج: 156 فیلتر نتایج به سال:
سفرهماهیها از جمله غضروف ماهیهایی هستند که در آبهای شمالی خلیج فارس و دریای عمان حضور دارند و ممکن است که بر روی دم شلاق مانند خود یک یا چند خار سخت دندانهدار داشته باشد. وقتی که پشت این حیوانات لمس شود، دم با یک حرکت رفلکسی حرکت میکند و خار خود را در بدن متجاوز وارد میکند که باعث ایجاد جراحت و وارد کردن زهر میشود. در این تحقیق به مقایسه خصوصیات مورفولوژیکی بافت زیرپوستی خار در گونههای...
سفرهماهیها از جمله غضروف ماهیهایی هستند که در آبهای شمالی خلیج فارس و دریای عمان حضور دارند و ممکن است که بر روی دم شلاق مانند خود یک یا چند خار سخت دندانهدار داشته باشد. وقتی که پشت این حیوانات لمس شود، دم با یک حرکت رفلکسی حرکت میکند و خار خود را در بدن متجاوز وارد میکند که باعث ایجاد جراحت و وارد کردن زهر میشود. در این تحقیق به مقایسه خصوصیات مورفولوژیکی بافت زیرپوستی خار در گونههای...
To test the hypothesis that the preference for ketone bodies rather than lipids as oxidative fuel in elasmobranchs evolved in response to the appearance of urea-based osmoregulation, we measured total non-esterified fatty acids (NEFA) in plasma as well as maximal activities of enzymes of intermediary metabolism in tissues from marine and freshwater elasmobranchs, including: the river stingray P...
Stingrays are prominent marine animals; however, there are few published reference values for their blood chemistry and hematology. Twenty-eight southern stingrays (Dasyatis americana) were caught using the bottom trawl nets of fishery-independent boats operated by the South Carolina Department of Natural Resources during June and July 2002 from Winyah Bay, South Carolina, to St. Augustine, Flo...
The cloning of cDNAs encoding facilitated urea transporters (UTs) from the kidneys of the elasmobranchs indicates that in these fish renal urea reabsorption occurs, at least in part, by passive processes. The previously described elasmobranch urea transporter clones from shark (shUT) and stingray (strUT-1) differ from each other primarily because of the COOH-terminus of the predicted strUT-1 tr...
The biological function of anatomical specializations in the mechanosensory lateral line of elasmobranch fishes is essentially unknown. The gross and histological features of the lateral line in the Atlantic stingray, Dasyatis sabina, were examined with special reference to its role in the localization and capture of natural invertebrate prey. Superficial neuromasts are arranged in bilateral ro...
BACKGROUND AND AIM Percutaneous coronary interventions (PCI) within chronically occluded coronary arteries remain challenging procedures with a lower success rate compared to classic PCI. However, over the last years we have witnessed many technological advances in the treatment of chronic total occlusion (CTO) including new wires, retrograde approach, subintimal tracking and re-entry technique...
In cartilaginous fish, two cDNAs encoding calcitonin-family receptors were isolated for the first time from the stingray brain. The open reading frame of one receptor cDNA coded a 525-amino acid protein. The amino acid identity of this receptor to human calcitonin-receptor-like receptor (CRLR) is 64.5%, frog CRLR is 64.7%, and flounder CRLR is 61.2% and this was higher than to human calcitonin ...
Tropical fresh water stingrays have become quite popular among amateur and professional aquarists due to their attractive appearance. However, the species may have a high life-threatening potential. Stingray intoxication is rare in Eastern Europe and there is no specific antivenin available. We present the first case of “rayism” – envenomation caused by sp. Reticulatus in Eastern Europe. The pa...
Six species of Acanthobothrium, 4 described as new, are reported in stingrays from southern Ecuador. Acanthobothrium atahualpai n. sp. in Gymnura afuerae most closely resembles Acanthobothrium fogeli and Acanthobothrium parviuncinatum by having bothridial hooks with recurved prongs and short handles. It differs from A. fogeli by having bothridial hooks 163-195 microns vs. 78-114 microns long an...
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