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 256 for “"Secretions"”.
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Pigments and Neurogenic Secretions of Dermasterias Imbricata
Identification of the compound from the asteroid Dermasterias imbricata that evokes the swimming response in the sea anemone Stomphia coccinea was attempted. Although the compound was not identified, it was postulated to be a low molecular weight highly polar molecule of possible carbohydrate …
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A study of lipids from animal skin secretions
… animals. Comparatively few animal skin glands or secretions have been investigated chemically. The sebaceous secretion of the sheep, wool wax, has been much investigated owing to the commercial value of this product; and the author participated for some years in studies of wool wax at the National …
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Biological activities and antidiabetic potential of novel peptides from frog secretions
… techniques have been used to study the frog skin secretions from the Burmeister’s leaf frog, Phyllomedusa burmeisteri; the hylid frog, Phyllomedusa sauvagei and the Chinese tiger frog, Hoplobatrachus rugulosus. More specifically, the molecular cloning strategy was performed to isolate target …
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Pheochromocytoma-induced cardiomyopathy : a model of synergistic effects of multifactorial tumor secretions
One specific thesis of pathogenesis holds that diseases are dependent upon the complex interactions of multiple compounds and cofactors. While one agent may dominate, its powerful effects are mediated by ancillary factors that alone may have no discernible action. We examined this paradigm by …
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Facultative butterfly-ant interactions - the role of variation in composition of nectar secretions
The significance of variation in nectar secretions of facultatively ant-associated lycaenid butterfly larvae was investigated. The strongly myrmecophilous European Polyommatus coridon, and two moderately myrmecophilous species, the Palaearctic P. icarus and the subtropical Zizeeria knysna were …
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Host-defence peptides from frog skin secretions: identification and bioactivity evaluation and optimisation
With the rapid development of antibiotic resistance, new types of antimicrobial drugs are urgently needed. A novel AMP, Brevinin-1H, was isolated from skin secretion of Amolops hainanensis (A. hainanensis) with broad spectrum antimicrobial activity, anti-proliferative activity, and strong …
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QUB-2791: Identification of novel bioactive peptide from the Agalychnis annae skin secretions
… Antibacterial peptides (AMPs) found in the secretions of amphibians have broad-spectrum antibacterial activity. In addition, AMP and antibiotics have different killing mechanisms, therefore, AMP may be promising for solving the antibiotic resistance.<br/><br/>In this study, a novel peptide …
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Bioactive peptides from the defensive skin secretions of selected American and Asian frogs
… believe that there is a great potential in these secretions to discover new pharmaceuticals from natural products. In recent years, the biochemical/pharmaceutical components including peptides, proteins and nucleic acids, derived from amphibians, have been subjected to intensive studies. Original …
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The discovery and functional assessment of novel peptides from the skin secretions of frogs
… and QUB2687, were isolated from from skin secretions of Phyllomedusa tarsius, Phyllomedusa palliata and Agalychnis callidryas, respectively. The complementary DNAs (cDNAs) encoding biosynthetic precursors of the three peptides were cloned through 3’RACE PCR. Briefly, degenerate primers were …
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Discovery of novel anti-inflammatory proteins inspired by bone marrow mesenchymal stem cell secretions
Bone marrow mesenchymal stem cells (MSCs) may soon become the first FDA-approved stem cell therapy for autoimmune and inflammatory disease. Our lab originally hypothesized that much of the therapeutic activity of MSCs may be attributed to molecules secreted by these cells. This thesis will test …
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Identification, Molecular Cloning and Functional Characterisation of Novel Bioactive Peptide Drugs from Amphibian Skin Secretions
Skin secretions of amphibians, which contain a large amount of bioactive compounds, play an essential role in their survival. For instance, some toxic or irritant secretions can protect them against predators. Due to the pharmacological and bioactive characteristics of the components in amphibian …
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The use of anticholinergic agents to treat excessive oropharyngeal and tracheal secretions in palliative care
… may develop difficulty clearing respiratory secretions causing a characteristic ‘death rattle’, which although not generally considered to be distressing for the patient, is often treated with a variety of anticholinergic drugs in an attempt to reduce the ‘noisy breathing’ for the benefit of …
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Bioactivity evaluation and structural modification of Bowman-Birk type protease inhibitory peptides from amphibian skin secretions
Frog skin can produce secretions containing complex chemical components in a holocrine manner. On the one hand, these chemical molecules play an important role in the physiological functions and defence systems of frogs. On the other hand, they provide the main source for the development of new …
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Hindgut secretions in <I> Camponotus pennsylvanicus </I> (De Geer) (Hymenoptera: Formicidae): attractants and nitrogenous excretory materials
The anatomical source of the trail pheromone in the black carpenter ant, <I> Camponotus pennsylvanicus </I>, was investigated by presenting workers with crude or synthetic hindgut extracts to test for attractancy and trail-following behavior. Chemical analysis was used in conjunction with …
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Behavioral and Physiological Evidence for Musk Gland Secretions as a Chemical Alarm Cue in the Cottonmouth, Agkistrodon Piscivorus
<p>Snakes release malodorous secretions from cloacal musk glands when harassed by predators. Although these secretions have mainly been evaluated as predator deterrents, they have also been suggested to function as alarm pheromones. I conducted two experiments to test the hypothesis that musk gland …
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The Effects of Methotrexate on Rat Parotid and Submandibular Glands and Their Secretions (Antineoplastic, Protein, Salivary, Amylase Catecholamines)
Experimental animals were injected intraperitoneally with methotrexate (15 mg/kg) for 3 days. Parotid and submandibular main ducts were cannulated and saliva flow was evoked by either intravenous infusion of acetylcholine (10 to 100 (mu)g/min) or an intravenous injection of bethanechol (100 …
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The Influence of Season on Estrus, Ovulation, and Reproductive Hormone Secretions in Barren and Periparturient Pony Mares (Postpartum, Adrenal, Parturition)
An extended study was done to determine reproductive and hormonal parameters in pony mares during the peripartum period over three seasons: winter, summer and fall. Experiments were also conducted on control and hormonally manipulated barren mares during the same three seasons.
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Exploring the Interface Between Macroorganisms and Microorganisms: Biochemical, Ecological, and Evolutionary Contexts
… 1) the presence and function of macroorganism secretions and 2) the role of secretions in managing microfouling on macroorganism surfaces. Particularly of interest are how barriers are biochemically reinforced to mitigate microfouling and the potential consequences of a breach in those …
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