نتایج جستجو برای: gill histopathology

تعداد نتایج: 33176  

Journal: :General and comparative endocrinology 1998
J M Shrimpton S D McCormick

The potential effects of growth hormone (GH), prolactin (Prl), and triiodothyronine (T3) on gill Na+,K+-ATPase activity and corticosteroid receptor (CR) concentration (Bmax) and dissociation constant (Kd) were examined in juvenile Atlantic salmon (Salmo salar). Compared to controls, fish injected with GH (ovine, 5.0 microgram g-1) had significantly greater gill Na+,K+-ATPase activity after 7 an...

2005
KEN LUKOWIAK

The gill withdrawal reflex (GWR) and its subsequent habituation can be evoked by tactile stimulation of the siphon or gill when the CNS is either intact or removed. It has been suggested that the neural circuits that mediate the GWR evoked at these two loci are parallel and independent. We provide three lines of evidence which show that these circuits interact and, therefore, comprise a single ...

Journal: :Aquatic toxicology 2008
Oana Birceanu M Jasim Chowdhury Patricia L Gillis James C McGeer Chris M Wood Michael P Wilkie

Models such as the Biotic Ligand Model (BLM) predict how natural organic matter (NOM) and competing ions (e.g., Ca(2+), H(+) and Na(+)) affect metal bioavailability and toxicity in aquatic organisms. However, such models focus upon individual metals, not metal mixtures. This study determined whether Pb and Cd interact at the gill of rainbow trout (Oncorhynchus mykiss) when trout were exposed to...

Journal: :iranian journal of ichthyology 0
mahboobeh khabbazi department of fisheries, gonbad kavous university, gonbad kavous, iran. mohammad harsij department of fisheries, gonbad kavous university, gonbad kavous, iran. seyed ali akbar hedayati department of fisheries, gorgan university of agricultural and natural resources, gorgan, iran. mohammad hasan gerami department of fisheries, gonbad kavous university, gonbad kavous, iran. hamed ghafari-farsani young researchers & elite club, shahrekord branch of islamic azad university, shahrekord, iran.

copper is a very common element in water resources. for this reason, concerns about the risks and consequences of this element in water contamination are arising. the purpose of this study was to investigate the effects of water-born cuo (copper (ii) oxide) on the rainbow trout, oncorhynchus mykiss gill tissue to establish a suitable biomarker for copper in water resources. samples with 18±3g b...

Journal: :Revista de biologia tropical 2004
A A Ayoade A A Sowunmi H I Nwachukwu

Fluctuating asymmetry (FA), often used as indicator of environmental stress, was evaluated in gill rakers and filaments of Labeo ogunensis from Ogun river, Southwest Nigeria. Mean length and weight of 13.68 +/- 1.28 cm and 59.40+17.48 g were respectively recorded. The gill rakers (t = -0.919) and filaments (t = -1.150) from both sides were not significantly different. The gill filaments recorde...

Journal: :Journal of evolutionary biology 2012
C P Gowell T P Quinn E B Taylor

Ecologically, morphologically and genetically distinct populations within single taxa often coexist in postglacial lakes and have provided important model systems with which to investigate ecological and evolutionary processes such as niche partitioning and ecological speciation. Within the Salmonidae, these species complexes have been well studied, particularly within the Coregonus clupeaformi...

Journal: :The Journal of experimental biology 2006
Diego F Fiol Stephanie Y Chan Dietmar Kültz

Mechanisms of induction of osmotic stress transcription factor 1 (Ostf1) were analyzed in gill epithelium of tilapia exposed to salinity stress. Experiments with primary cultures of gill epithelial cells revealed that hyperosmotic Ostf1 induction was independent of systemic factors. In addition, the synthetic glucocorticoid receptor agonist dexamethasone did not affect Ostf1 levels, arguing aga...

Journal: :The Journal of experimental biology 2013
Yuki Hongo Yoshimitsu Nakamura Shigeru Shimamura Yoshihiro Takaki Katsuyuki Uematsu Takashi Toyofuku Hisako Hirayama Ken Takai Masatoshi Nakazawa Tadashi Maruyama Takao Yoshida

Deep-sea Calyptogena clams harbor thioautotrophic intracellular symbiotic bacteria in their gill epithelial cells. The symbiont fixes CO2 to synthesize organic compounds. Carbonic anhydrase (CA) from the host catalyzes the reaction CO2 + H2O ↔ HCO3(-) + H(+), and is assumed to facilitate inorganic carbon (Ci) uptake and transport to the symbiont. However, the localization of CA in gill tissue r...

Journal: :Diseases of aquatic organisms 1999
F R Roubal

Sanguinivorous Naobranchia variabilis prefer the first gill arch, external hemibranch and anterior end of the gill arch. The smallest N. variabilis observed attached to fish by a thin filament which connects fused tips of second maxillae to a 'plug' inserted into the gill tissue. Second maxillae enlarge to encircle and increasingly compress the gill filament, which results in a thin layer of ep...

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