نتایج جستجو برای: asterina burtani
تعداد نتایج: 167 فیلتر نتایج به سال:
مایکوسپرین ها، متابولیت های جذب کننده تابش فرابنفش هستند که از طریق مسیر سنتز اسید های آمینه آروماتیک (shikimate pathway) تولید می شوند. در مطالعه حاضر به بررسی تاثیر نوع غذا بر میزان تجمع این ترکیبات در آرتمیا اورمیانا (artemia urmiana) و آرتمیای بکرزا (parthenogenetic artemia) پرداخته شد. سیست های هر دو جمعیت آرتمیا تحت شرایط استاندارد تخم گشایی شدند. لارو ها (ناپلیوس اینستار i) بلافاصله بعد ...
Meiotic maturation is essential for the reproduction procedure of many animals. During this process an oocyte produces a large egg cell and tiny polar bodies by highly asymmetric division. In this study, to fully understand the sophisticated spatiotemporal regulation of accurate oocyte meiotic division, we focused on the global and local changes in the tension at the surface of the starfish (As...
Starfish oocytes arrest at metaphase of the first meiotic division (MI arrest) in the ovary and resume meiosis after spawning into seawater. MI arrest is maintained by lower intracellular pH (pH(i)) and release from arrest by cellular alkalization. To elucidate pH(i) regulation in oocytes, we cloned the starfish (Asterina pectinifera) Na(+)/H(+) exchanger 3 (ApNHE3) expressed in the plasma memb...
I mmune cell recruitment is a crucial process in cell homing and vertebrate immunity, initiating powerful host innate and adaptive defense mechanisms. However, immune cell recruitment also critically contributes to the pathologic sequelae of events driving various inflammatory diseases in humans such as atherosclerosis. The recruitment process is executed by chemokines, which promote the direct...
In the starfish Marthasterias glacialis, polyethylene glycol (PEG) homologous fused pairs consisting of two immature oocytes, blocked at the germinal vesicle stage, or two ootids, blocked at the female pronucleus stage, remain arrested at these specific stages, unless they are stimulated by the hormone 1-methyladenine. In contrast, heterologous pairs develop up to female pronucleus formation in...
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