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1988

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Articles 1 - 14 of 14

Full-Text Articles in Medical Sciences

Passive Cation Transport In Reversibly Sickling Deer Red Blood Cells, Norma C. Adragna, Peter K. Lauf Dec 1988

Passive Cation Transport In Reversibly Sickling Deer Red Blood Cells, Norma C. Adragna, Peter K. Lauf

Pharmacology and Toxicology Faculty Publications

No abstract provided.

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The Epidermal Growth Factor Receptor From Prostate Cells Is Dephosphorylated By A Prostate-Specific Phosphotyrosyl Phosphatase., Ming-Fong Lin, Gail M. Clinton Dec 1988

The Epidermal Growth Factor Receptor From Prostate Cells Is Dephosphorylated By A Prostate-Specific Phosphotyrosyl Phosphatase., Ming-Fong Lin, Gail M. Clinton

Journal Articles: Biochemistry & Molecular Biology

Human prostatic acid phosphatase (PAcP) has been found to have phosphotyrosyl-protein phosphatase activity (H. C. Li, J. Chernoff, L. B. Chen, and A. Kirschonbaun, Eur. J. Biochem. 138:45-51, 1984; M.-F. Lin and G. M. Clinton, Biochem. J. 235:351-357, 1986) and has been suggested to negatively regulate phosphotyrosine levels, at least in part, by inhibition of tyrosine protein kinase activity (M.-F. Lin and G. M. Clinton, Adv. Protein Phosphatases 4:199-228, 1987; M.-F. Lin, C. L. Lee, and G. M. Clinton, Mol. Cell. Biol. 6:4753-4757, 1986). We investigated the molecular interaction of PAcP with a specific tyrosine kinase, the epidermal growth factor …

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Patterns Of Polyadenylation Site Selection In Gene Constructs Containing Multiple Polyadenylation Signals., Roger Denome, Charles Cole Nov 1988

Patterns Of Polyadenylation Site Selection In Gene Constructs Containing Multiple Polyadenylation Signals., Roger Denome, Charles Cole

Dartmouth Scholarship

We have constructed a series of plasmids containing multiple polyadenylation signals downstream of the herpes simplex virus type 1 (HSV) thymidine kinase (tk)-coding region. The signals used were from the simian virus 40 (SV40) late gene, the HSV tk gene, and an AATAAA-containing segment of the SV40 early region. This last fragment signals polyadenylation poorly in our constructs and not at all during SV40 infection. All plasmids contained the SV40 origin of replication. Plasmids were transfected into Cos-1 cells; after 48 h, cytoplasmic RNA was isolated and the quantity and 3'-end structure of tk mRNAs was analyzed by using S1 …

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Camp Antagonizes Interleukin 2-Promoted T-Cell Cycle Progression At A Discrete Point In Early G1., Kirk W. Johnson, Bruce H. Davis, Kendall A. Smith Aug 1988

Camp Antagonizes Interleukin 2-Promoted T-Cell Cycle Progression At A Discrete Point In Early G1., Kirk W. Johnson, Bruce H. Davis, Kendall A. Smith

Dartmouth Scholarship

T lymphocytes are stimulated to proliferate in an autocrine/paracrine manner by the lymphokine interleukin 2 (IL-2). In seeking further insight into the mechanisms by which IL-2 induces progression of T cells through the G1 phase of the cell cycle, studies were performed with agents that increase cellular adenosine 3',5'-cyclic monophosphate (cAMP), a well-known inhibitor of lymphocyte growth. The addition of dibutyryl-cAMP, cholera toxin, forskolin, or 3-isobutyl-1-methylxanthine to an IL-2-dependent murine T-cell line evoked a dose-related suppression of S-phase transition without affecting cellular viability. Moreover, elevation of cAMP levels led to an accumulation of uniformly small cells, suggesting an arrest in …

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Insulin Stimulates The Dephosphorylation And Activation Of Acetyl-Coa Carboxylase., Lee A. Witters, Thomas D. Watts, Diana L. Daniels, Joseph L. Evans Aug 1988

Insulin Stimulates The Dephosphorylation And Activation Of Acetyl-Coa Carboxylase., Lee A. Witters, Thomas D. Watts, Diana L. Daniels, Joseph L. Evans

Dartmouth Scholarship

The mechanism underlying the ability of insulin to acutely activate acetyl-CoA carboxylase [acetyl-CoA: carbon-dioxide ligase (ADP-forming), EC 6.4.1.2; AcCoA-Case] has been examined in Fao Reuber hepatoma cells. Insulin promotes the rapid activation of AcCoACase, as measured in cell lysates, and this stimulation persists to the same degree after isolation of AcCoACase by avidin-Sepharose chromatography. The insulin-stimulated enzyme, as compared with control enzyme, exhibits an increase in both citrate-independent and -dependent activity and a decrease in the Ka for citrate. Direct examination of the phosphorylation state of isolated 32P-labeled AcCoACase after insulin exposure reveals a marked decrease in total enzyme phosphorylation …

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Phloretin And Phlorizin Derivative Containing Compounds, Donald F. Diedrich, Susanne L. Diedrich Jul 1988

Phloretin And Phlorizin Derivative Containing Compounds, Donald F. Diedrich, Susanne L. Diedrich

Pharmacology and Nutritional Sciences Faculty Patents

Compounds including phloretin and/or phlorizin derivatives coupled to an undigestible and non-absorbable matrix are provided. The compounds have pharmacological efficacies. They inhibit sugar uptake from the intestine and may be used in composition form in methods for treating diabetes and for promoting weight loss. A method for the manufacture of these compounds and a novel intermediate phlorizin derivative for making these compounds are also disclosed.

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Foraging Patterns Of Two Syngnathid Fishes: Importance Of Harpacticoid Copepods, Kevin Tipton, Susan S. Bell Jul 1988

Foraging Patterns Of Two Syngnathid Fishes: Importance Of Harpacticoid Copepods, Kevin Tipton, Susan S. Bell

Integrative Biology Faculty and Staff Publications

The diets of juvenile (mm) Syngnathus scovelli and of Hippocampus zosterae, abundant members of a resident fish community in a Thalassia testudnum seagrass bed in Tampa Bay, Florida, were examined from Apnl to October 1984. Harpacticoid copepods comprised most of the diet, both in terms of percent number and percent biomass, for the smaller size classes of S. scovelli and for H. zosterae, and harpacticoids generally had the highest index of relative importance (IRI) for both syngnathids. S. scovelli displayed ontogenetic switching to larger food items, such as amphipods, shrimp and crustacean eggs. Harpacticus sp. 1 was the …

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K+ Efflux In Nih Mouse 3t3 Cells And Transformed Derivatives: Dependence On Extracellular Ca2+ And Phorbol Esters., Martin Lubin Jul 1988

K+ Efflux In Nih Mouse 3t3 Cells And Transformed Derivatives: Dependence On Extracellular Ca2+ And Phorbol Esters., Martin Lubin

Dartmouth Scholarship

In culture medium deficient in Ca2+, NIH mouse 3T3 cells lose K+, gain Na+, and stop growing. A marked increase in the rate of K+ efflux accounts for this loss; Na+, K+-ATPase pump activity increases but does not fully compensate for enhanced K+ efflux. Phorbol esters and cycloheximide inhibit K+ loss in Ca2+-deficient medium. Phorbol esters inhibit K+ efflux from human fibroblasts as well, even at physiological levels of Ca2+. Two cell lines derived from NIH-3T3, one transformed by a simian virus 40 deletion mutant, the other by the polyoma virus oncogene encoding the middle-sized tumor antigen, retain K+ and …

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Art, Science, Areté, Neil Greenberg Apr 1988

Art, Science, Areté, Neil Greenberg

Faculty Publications and Other Works -- Ecology and Evolutionary Biology

No abstract provided.

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Dynamics Of The Aboveground And Belowground Structure Of The Seagrass Halodule Wrightii, Ruth A. Pangallo, Susan S. Bell Mar 1988

Dynamics Of The Aboveground And Belowground Structure Of The Seagrass Halodule Wrightii, Ruth A. Pangallo, Susan S. Bell

Integrative Biology Faculty and Staff Publications

Dynamics of the aboveground and belowground structure of the seagrass Halodule wrightii (Asherson) Asherson was studied from April 1984 to March 1985. Seasonality of plant structure was evident, with the highest abundance of short shoots and belowground structures occurring in June. An Inverse relationship between root and rhizome biomass was observed with the former reaching a maximum in February and March, while the latter attained highest values in July and August. The number of short shoots produced per branch varied over the year, ranging from a low of 0.4 to a high of 1.5. The ratio number of branches/rhizome length …

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Fibrinogen Birmingham: A Heterozygous Dysfibrinogenemia (Aα 16 Arg → His) Containing Heterodimeric Molecules, Kevin R. Siebenlist, J. T. Prchal, Michael W. Mosesson Mar 1988

Fibrinogen Birmingham: A Heterozygous Dysfibrinogenemia (Aα 16 Arg → His) Containing Heterodimeric Molecules, Kevin R. Siebenlist, J. T. Prchal, Michael W. Mosesson

Biomedical Sciences Faculty Research and Publications

Fibrinogen was isolated from the plasma of a 25-year-old female with a history of mild bleeding and several recent moderate to severe hemorrhagic episodes. Coagulability with thrombin approached 100% and varied directly with the time of incubation with the enzyme. High- performance liquid chromatography analysis of thrombin-induced fibrinopeptide release demonstrated retarded fibrinopeptide A (FPA) and fibrinopeptide B (FPB) release and the presence of an abnormal A peptide (FPA) amounting to 50% of the total. The same biochemical abnormalities were found in her asymptomatic father. Amino acid analysis and carboxypeptidase digestion of FPA demonstrated the substitution of His for Arg at …

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Identification Of The Binding Subunit Of The Sigma-Type Opiate Receptor By Photoaffinity Labeling With 1-(4-Azido-2-Methyl[6-3h]Phenyl)-3-(2-Methyl[4,6-3h]Phenyl)Guanidine, Michael Kavanaugh, Barbara C. Tester, Michael W. Scherz, John F. W. Keana, Eckard Weber Jan 1988

Identification Of The Binding Subunit Of The Sigma-Type Opiate Receptor By Photoaffinity Labeling With 1-(4-Azido-2-Methyl[6-3h]Phenyl)-3-(2-Methyl[4,6-3h]Phenyl)Guanidine, Michael Kavanaugh, Barbara C. Tester, Michael W. Scherz, John F. W. Keana, Eckard Weber

Biomedical and Pharmaceutical Sciences Faculty Publications

The sigma-type opiate receptor is a distinct binding site in the brain that may mediate some of the psychotomimetic effects caused by benzomorphan opiates and phencyclidine in humans. We have developed a synthetic, highly selective ligand for this receptor, 1,3-di-o-tolylguanidine (DTG). To identify the binding protein(s) of the sigma receptor, we have now synthesized a radiolabeled azide derivative of DTG, 1-(4-azido-2-methyl[6-3H]phenyl)-3-(2-methyl[4,6-3H]phenyl)-guanidine ([3H]N3DTG). In guinea pig brain membrane binding assays conducted in the dark, [3H]N3DTG bound reversibly, selectively, and with high affinity (Kd = 10 nM) to sigma receptors. The drug specificity profile of reversible [3H]-N3DTG binding was identical to that …

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Improved Selective Medium For The Isolation Of Treponema Hyodysenteriae, Robert A. Kunkle, J. M. Kinyon Jan 1988

Improved Selective Medium For The Isolation Of Treponema Hyodysenteriae, Robert A. Kunkle, J. M. Kinyon

School of Veterinary and Biomedical Sciences: Faculty Publications

An agar medium with improved selection for Treponema hyodysenteriae was developed. Cultures of T. hyodysenteriae and T. innocens, feces from 11 clinically normal pigs, and colonic contents from 6 pigs with gross lesions consistent with swine dysentery were diluted in phosphate-buffered saline and plated on Trypticase soy agar (BBL Microbiology Systems, Cockeysville, Md.) with 5% citrated bovine blood (TSA), TSA with 400 ,ug of spectinomycin per ml (TSA-S400), TSA-S400 with 25 ,ug each of colistin and vancomycin per ml, and TSA with 5% pig feces extract and five antimicrobial agents (spiramycin, rifampin, vancomycin, colistin, and spectinomycin) (BJ). Viable numbers …

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Biotechnology And The Law: Social Responsibility V. Freedom Of Scientific Inquiry?, George P. Smith Ii Jan 1988

Biotechnology And The Law: Social Responsibility V. Freedom Of Scientific Inquiry?, George P. Smith Ii

Scholarly Articles

At American University in Washington, D.C., on November 20, 1973, Julius Stone presented the tenth annual Mooers Lecture, entitled, "Knowledge, Survival, and the Duties of Science."' The central question and thesis that he propounded could and, indeed, should be raised anew today; they form the very core of the province and function of law, science, and medicine. In our brave new world they point to the leeways of choice and patterns of discourse that exist in grappling with the central issue of social responsibility in scientific inquiry. Perhaps they will assist in forging a consensus opinion for a subsequent course …

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