نتایج جستجو برای: killifish
تعداد نتایج: 771 فیلتر نتایج به سال:
Annual killifish adapted to life in seasonally ephemeral water-bodies exhibit desiccation resistant eggs that can undergo diapause, a period of developmental arrest, enabling them to traverse the otherwise inhospitable dry season. Environmental cues that potentially indicate the season can govern whether eggs enter a stage of diapause mid-way through development or skip this diapause and instea...
narrow physiological range, equivalent to about one-third seawater osmolality. The gills, kidney and intestine are important osmoregulatory organs in fishes, creating ionic and osmotic gradients between the body fluid and external environments (Evans, 1993). It is well established that gill mitochondria-rich (MR) cells, or chloride cells, are responsible for salt secretion in seawater-adapted f...
1 2 In teleost oocytes, yolk proteins (YP)-derived from the yolk precursors vitellogenins are 3 partially cleaved into free amino acids and small peptides during meiotic maturation prior to 4 ovulation. This process increases the osmotic pressure of the oocyte that drives its hydration 5 which is essential for the production of buoyant eggs by marine teleosts (pelagophil species). 6 However, th...
Understanding and predicting the fate of populations in changing environments require knowledge about the mechanisms that support phenotypic plasticity and the adaptive value and evolutionary fate of genetic variation within populations. Atlantic killifish (Fundulus heteroclitus) exhibit extensive phenotypic plasticity that supports large population sizes in highly fluctuating estuarine environ...
In teleost oocytes, yolk proteins (YPs) derived from the yolk precursors vitellogenins are partially cleaved into free amino acids and small peptides during meiotic maturation before ovulation. This process increases the osmotic pressure of the oocyte that drives its hydration, which is essential for the production of buoyant eggs by marine teleosts (pelagophil species). However, this mechanism...
New Bedford Harbor (MA, U.S.A.; NBH) is a Superfund site inhabited by Atlantic killifish (Fundulus heteroclitus) with altered aryl hydrocarbon receptor (Ahr) signaling, leading to resistance to effects of polychlorinated biphenyls (PCBs) and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). The Ahr is a transcription factor that regulates gene expression of many Phase I and II detoxifying enzymes and...
INTRODUCTION The euryhaline killifish Fundulus heteroclitus lives in estuaries and salt marshes on the eastern coast of North America. Killifish must dynamically regulate their ion balance because of routine fluctuations in salinity in their natural environment. This species can tolerate changes in salinity from freshwater to nearly four times seawater (Griffith, 1974), and have therefore been ...
Previous studies have shown that killifish (Fundulus heteroclitus) renal proximal tubules express a luminal membrane transporter that is functionally and immunologically analogous to the mammalian multidrug resistance-associated protein isoform 2 (Mrp2, ABCC2). Here we used confocal microscopy to investigate in killifish tubules the transport of a fluorescent cAMP analog (fluo-cAMP), a putative...
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