Life Sciences Commons^™

Discharge Responses Of The Nematocysts Of The Stinging Nettle Chrysaora Quinquecirrha To External Stimuli, Christa Merz Hubbard

Master's Theses

Chrysaora quinquecirrha nematocysts and isolated in suspension were systematically exposed to a wide range of chemical and mechanical stimuli to determine which ones would initiate discharge.

Nematocysts in situ were found to be highly responsive to stimuli and showed well-marked, immediate discharge when treated with acid, base and electrical stimuli. Slight discharge occurred with salt solutions, beef extract, beef extract and contact, human hair and change in temperature.

Discharge increased with the concentration of the reagent or the strength of the mechanical stimuli. A significant increase in discharge occurred in isolated nematocysts treated with HCl, acetic acid and sodium hydroxide. …

The Effects Of The Toxins Of Lophopodella Carteri (Ectoprocta) On The Blood Gas Properties Of The Bluegill Lepomis Macrochirus, Robert Allen May

Master's Theses

Lepomis macrochirus (bluegill) were exposed, in small containers, to homogenates of Lophopodella carteri, an ectoproct that contains substances toxic to gilled vertebrates. Blood pH, pco₂, and po₂ were determined with a blood gas analyzer. Blood carbonic anhydrase activity was measured manometrically.

The ectoproct toxins caused significant decreases in blood pH and po₂ and a significant increase in blood pco₂ and carbonic anhydrase activity. It is proposed that these changes in blood properties were initiated by a film of mucus covering the gill epithelium. The secretion of mucus is thought to be a response to irritation …

An Examination Of The Pharmacology Of Spermidine And Its Possible Role In The Central Nervous System, Lawrence Rodichok

Master's Theses

No abstract provided.

Interspecific Homology Between Ribosomal Proteins: The Characterization Of A 30 S Ribosomal Protein From Bacillus Stearothermophilus Which Functionally Replaces Escherichia Coli S 19, Artemios W. Vassos

Master's Theses

No abstract provided.

Effects Of Diethylstilbestrol, Norethindrone, And Mestranol On Selected Microbes, John N. Haan

Master's Theses

No abstract provided.

Regeneration In Zebrafish, Brachydanio Rerio, Gabriel J. Ekandem

Master's Theses

No abstract provided.

The Dependency Of Brain Membrane-Bound Enzymes On Exogenous Linoleic And Linolenic Acids, Frank Joseph Spitz

Master's Theses

No abstract provided.

Ketoaldehydes And Glyoxalase Type Enzymes In The Life Cycle Of Panagrellus Silusiae, Caroline Gardiner

Master's Theses

No abstract provided.

In Vitro Effects Of Prolactin, Cortisol, Aldosterone, And Cyclic Amp On Branchial Na+, K+ - Activated Atpase Of The Killifish, Fundulus Heteroclitus, Stephen Burke Kerby

Master's Theses

In vitro effects of prolactin, cortisol, aldosterone, and cyclic adenosine monophosphate were studied on branchial Na+, K+ - activated ATPase of freshwater adapted killifish, Fundulus heteroclitus. Decreases in ATPase activity were found after treatment with prolactin and aldosterone. Cyclic AMP caused an increase in ATPase activity. The action of cortisol on this enzyme was not clear.A dose - response relationship was found only for cyclic AMP .It is proposed that cyclic AMP may be involved in the adaptation of F. heteroclitus to seawater.

A Comparative Study Of Fish Populations In The Vicinity Of A Thermal Discharge In The James River, Virginia, Judson Wayne White

Master's Theses

The size, species composition and structure of fish populations in a six mi stretch of the James River in the Piedmont Province of Virginia were analyzed. Twenty collections were made by electrofishing from October 1972 through September 1973 from both the north side of the river, which received a thermal discharge from a power station, and the south side where temperatures were ambient. Parameters investigated were number of species, total number of individuals and the Shannon-Wiener and evenness indices of species diversity. Significant differences in seasonal patterns were found between the communities in the thermal discharge and those on the …