Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 41 for “"Teleosts"”.
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Pathology of parasitic infections in marine teleosts
The cellular responses of Crenimugil labrosus and Pleuronectes platessa to tissue parasites have been investigated using metacercariae of Cryptocotyle lingua and Rhipidocotyle johnstonei, and the myxosporidjan Myxobolus exiguous. The study was based on fish naturally infected with the parasites, …
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Differential Selection Pressure Among Duplicated Genes In Teleosts
… myo5ba for the cargo binding domain. Also, in teleosts, I found two rate classes for the rab11a branch, rab11a1 branch, and rab27bb. Using sequences from 7-10 organisms that diverged from a common ancestor 140-440 million years ago, I found ω values between 0.01 and 0.24 for the whole coding …
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Gonadal intersex in teleosts: Mechanisms, molecular biomarkers and diagnostic assays
<p>Natural and synthetic estrogenic and androgenic compounds are continuously released into aquatic ecosystems. Exposure of teleost fishes to these contaminants can negatively impact sex differentiation and reproductive output. Specifically, development of gonadal intersex in gonochoristic (fixed …
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Osmoregulation in teleosts by cortisol and prolactin: adaptation to low pH environments
Contains fulltext : mmubn000001_002239175.pdf (Publisher’s version ) (Open Access)
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Diencephalic asymmetries: morphological, immunohistochemical and ultrastructural analysis of habenular nuclei in elasmobranchs and teleosts
The habenular nuclei are diencephalic structures present in Vertebrates and they form, with the associated fiber systems, a part of the system that connects the telencephalon to the ventral mesencephalon (Concha M. L. and Wilson S. W., 2001). In representative species of almost all classes of …
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The biology of marine myxosporida and an investigation into the effects of these parasites on teleosts
A survey of Myxosporidia in teleosts from the South-Western. coast of England demonstrated the widespread occurrence of these parasites. Infection in selected fish species was related to age, sex and seasonal migration of the host. Structural studies of Myxobolus exiguus and Myxidium incurvatum …
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Sexual patterns of monooxygenase function in the liver of marine teleosts and the regulation of activity by estradiol
… activities were investigated in the marine teleosts scup (Stenotomus chrysops) and winter flounder (Pseudopleuronectes americanus). Microsomal cytochrome P-450 content per unit proteln was 3-6 tlmes lower in gonadally mature females than males. Ethoxyresorufin O-deethylase (EROD) activity in …
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Coastal zone utilization by juvenile fish in the Eastern Cape, South Africa
… habitats as nursery areas for the common coastal teleosts. The thesis comprises ten separate research papers and an overview of coastal zone utilization by juvenile teleosts in the Eastern Cape. Research was concentrated in Algoa Bay and covered the nearshore ichthyo-plankton, tidal exchange of …
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Estradiol regulation of the neurohypophysial hormones in the goldfish, Carassius auratus.
… vasopressin (AVP) and oxytocin (OXT). In teleosts, arginine vasotocin (AVT) and isotocin (IST) replace AVP and OXT, respectively. In mammals, the NHs have distinct functions as AVP is involved with fluid homeostasis and blood pressure regulation whereas OXT is involved with reproductive …
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CHARACTERIZATION OF THE EUKARYOTIC TRANSLATION INITIATION FACTOR 4E (eIF4E) FAMILY MEMBERS IN THE ZEBRAFISH (Danio rerio)
… been retained in tetrapods, but lost in higher teleosts. eIF4E-1C, appears to have retained function as a prototypical initiation factor. A duplication of Class II eIF4Es occurred prior to the emergence of the tetrapod branch, becoming eIF4E-2A and -2B. The genes proximal to the eIF4E-2A locus …
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An assessment of the long-term changes in chondrichthyan abundance on the inshore trawl grounds of the Agulhas Bank, South Africa
… smaller species was found. This applied both for teleosts as well as chondrichthyans, with the entire chondrichthyan catch composition showing a decrease, with the exception of Callorhinchus capensis, which increased significantly. Changes in chondrichthyan swept-area density were found to follow …
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Investigating non-canonical vertebral development in the zebrafish model system
… multiple ways of building vertebral bodies. In teleosts fish, the vertebral bodies initially form as mineralised rings within the notochord sheath (chordacentra) and then secondarily, bone is deposited around this (perichordal centra and arches). Notochord cells (chordoblasts) have been …
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Assessing the Effects of Temperature, Feeding Status, and the Microbiome on the Maximal Activities of Several Enzymes Important to Energy Production and Ammonia Detoxification in the Intestines of Teleost Fish
… in the intestines of three species of teleosts: the goldfish, rainbow darter and central stoneroller. In warm-acclimated goldfish, intestinal and branchial tissues were more responsive to feeding, while renal tissues were not affected by digestion or thermal acclimation. This was …
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Studio citogenetico della famiglia Muraenidae (Anguilliformes: Actinopterygii) mediante tecniche di citogenetica classica e molecolare
… (Actinopterygii, Anguilliformes, Muraenidae) are teleosts widespread in tropical and temperate seas and among the most common predators of the coral reef. Nevetherless, they are too little studied due to their hidden and nocturnal habits; furthermore, they are not important commercially, and in …
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Analysis of the antifreeze glycoprotein containing genomic locus in the Antarctic notothenioid fish dissostichus mawsoni
… BLAST searches of NCBI ESTs from different teleosts revealed clade III trypsinogens to be present in more basal warm-water teleosts (catfish, Siluriformes), suggesting they evolved in a time of warm climate, and thus were not of cold adaptive origin thus the cold active capability of some …
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The Na/K-ATPase in the gills of Antarctic and New Zealand nototheniids: The Physiologic and Molecular Effects of Warm-acclimation.
… of « 600mOsm/kg nearly double that of temperate teleosts. The increase in serum osmolality is due to proportional increases in the Na" and CT concentrations as compared to temperate teleosts, including members of the same family. The sodium and potassium adensosine triphosphatase (Na/K-ATPase) in …
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Carbachol-Induced Pigment Granule Dispersion
… that interdigitate with photoreceptors. In teleosts, the RPE aids in light adaptation through pigment granule movements. In the bright light, pigment granules are dispersed into the long apical processes thereby shielding rods from excessive light. The opposite occurs in dark conditions; …
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Aspects of the biology of Trypanorhynch tapeworms and investigations on their use as biological tags
… as a biological tag for commercially important teleosts. A pre-requisite of this last problem was the need to review critically all information on the use of parasites as population indicators. Thus a further 100 papers published in primary journals were researched. The work concludes with a …
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Zebrafish Cardiac Development Requires a Conserved Secondary Heart Field
… in birds and mammals are conserved in teleosts, as Nkx2.5 and Nkx2.7 as well as Fgf8 regulate Bmp signaling in the zebrafish heart fields. Additionally, the transcription factor Tbx1 and the Sonic hedgehog pathway are necessary for normal development of the zebrafish arterial pole.</p>
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Age, Growth, Reproduction, and Diet of the Finetooth Shark, <i>Carcharhinus isodon</i>, in the Northern Gulf of Mexico
… was conducted on 518 sharks and revealed that teleosts dominated the diet, with Gulf menhaden, <em>Brevoortia patronus,</em> being the most important prey species. The results of this comprehensive study better defines finetooth shark life history in the nGOM</p>
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