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Heterochronic Mutants Of The Nematode Caenorhabditis Elegans, Victor Ambros, R. Horvitz

Victor R. Ambros

Mutations in the Caenorhabditis elegans genes lin-14, lin-28, and lin-29 cause heterochronic developmental defects: the timing of specific developmental events in several tissues is altered relative to the timing of events in other tissues. These defects result from temporal transformations in the fates of specific cells, that is, certain cells express fates normally expressed by cells generated at other developmental stages. The identification and characterization of genes that can be mutated to cause heterochrony support the proposal that heterochrony is a mechanism for phylogenetic change and suggest cellular and genetic bases for heterochronic variation.

Characterization Of The Transport Of Oxaloacetate By Pea Leaf Mitochondria, David J. Oliver, Griffin H. Walker

David J. Oliver

Mitochondria isolated from pea (Pisum sativum L.) leaves are able to transport the keto acid, oxaloacetate, from the reaction medium into he mitochondrial matrix at high rates. The rate of uptake by the mitochondria was measured as the rate of disappearance of oxaloacetate from the reaction medium as it was reduced by matrix malate dehydrogenase using NADH provided by glycine oxidation. The oxaloacetate transporter was identifed as being distinct from the dicarboxylate and the α-ketoglutarate transporters because of its inhibitor sensitivities and its inability to interact with other potential substrates. Phthalonate and phthalate were competitive inhibitors of oxaloacetate transport with …

Process For The Preparation Of Protein Isolates Of Improved Quality From Vegetable Protein Sources, Lawrence A. Johnson, Hwei-Mei Wen

Lawrence A. Johnson

Protein isolates are recovered from vegetable protein sources, such as sunflower meal, by extracting the meal with an alkali solution in the presence of an alkali metal borohydride, and then acid precipitating the resulting aqueous protein extract phase to produce a protein isolate. Typically, the alkali metal borohydride is employed in an amount of at least about 20 ppm, based on the combined weight of vegetable meal and alkali solution. Protein isolates produced by this process exhibit improved color, palatability and/or nutritional value, and comprise highly desirable additives for food products, animal foods, etc.

Influence Of Hormonal Chemicals And Genotypes On Fruit Growth Of Lycopersicon Esculentum, Henry R. Owen

Henry R. Owen

The effects of hormonal chemicals and different genotypes on fruit growth of greenhouse-grown tomatoes ( Lycopersicon esculentum Mill.) were examined. Continuous root application of lOnM N6 -benzylaminopurine in Hoagland's nutrient solution to tomato seedlings of 'Fireball' and 'Red Cherry' significantly delayed anthesis of 'Fireball', but not 'Red Cherry'. Ovary diameter at anthesis, final fruit diameter, and fruit weight of both cultivars were unaffected. Irrespective of treatments, a significant positive correlation was obtained between ovary diameter at anthesis and final fruit diameter. A single foliar application of 0.25mM or 0.37mM 6-naphthoxyaceticacid (betaNOA) at the appearance of the first inflorescence of 'Fireball' …

The Flight And Migration Ecology Of The Red Milkweed Beetle (Tetraopes Tetraophthalmus), Mark Davis

Mark Davis

No abstract provided.

Taxonomic Notes On Two Common Neotropical Species Of Cyperus (Cyperaceae), Gordon C. Tucker

Gordon C. Tucker

No abstract provided.

A Revision Of Kyllinga Rottb. (Cyperaceae) In Mexico And Central America, Gordon C. Tucker

Gordon C. Tucker

No abstract provided.

Sective Deficits In The Sense Of Smell Caused By Chemical Modification Of Olfactory Epithelium, J Russell Mason, Larry Clark, Thomas Morton

Larry Clark

A chemically selective procedure for covalent modification of Schiff base-forming binding sites in proteins is demonstrated in vitro. In vivo studies show that the same procedure produces a selective anosmia ("odor blindness") when applied to the olfactory epithelia of experimental animals. Surgical experiments confirm that the sense of smell is specifically affected.

Consequences Of Homeothermic Capacity Of Nestlings On Parental Care In The European Starling, Larry Clark

Larry Clark

The homeothermic capacity of chicks varied as a function of brood size, age, and air temperature. Commitment to rooding by parents also varied as a function of brood size, age of the young brooded, and prevailing air temperature. It was experimentally determined that parents altered their brooding commitment in direct response to the achieved mean homeothermic capacity of the brood rather than energy demands of the brood per se. Because larger broods achieved a given level of homeothermic capacity earlier than smaller broods, parents spent less time brooding larger broods. This "freed" time represented an increase in potential foraging time …

Tva Fluid Fertilizers Chapter Two - Agronomic Aspects, Eugene C. Sample, Gary W. Akin, Robert Mikkelsen

Robert Mikkelsen

No abstract provided.

Tva Fluid Fertilizers Chapter One- History, Growth, And Status, Robert Mikkelsen

Robert Mikkelsen

No abstract provided.

Tva Fluid Fertilizers Chapter Four - Chemical Properties, A W. Frazier

Robert Mikkelsen

No abstract provided.

Tva Fluid Fertilizers Chapter Five - Production, Handling, And Use Of Anydrous Ammonia And Status, G. M. Blouin, H. L. Kimborough, W. J. Sharratt

Robert Mikkelsen

No abstract provided.

Mechanics, Power Output And Efficiency Of The Swimming Muskrat (Ondatra-Zibethicus), Frank E. Fish

Frank E. Fish

No abstract provided.

Cyclic Gmp May Serve As A Second Messenger In Peptide-Induced Muscle Degeneration In An Insect, Lawrence M. Schwartz, J. W. Truman

Lawrence M. Schwartz

At the end of metamorphosis, the intersegmental muscles of the moth Antheraea polyphemus undergo rapid degeneration in response to the peptide eclosion hormone (EH). Muscle death was preceded by a 22-fold increase in muscle guanosine-3',5'-cyclic monophosphate (cGMP) titers, which peaked 60 min after peptide exposure; adenosine-3'5'-cyclic monophosphate (cAMP) titers remained unchanged. EH induced a dose-dependent increase in muscle cGMP content with a threshold dose similar to that needed to induce cell death. Exogenous cGMP, but not cAMP, mimicked the action of EH. Sodium nitroprusside, a potent stimulator of guanylate cyclase, and methylated xanthines, a class of 3',5'-cyclic-nucleotide phosphodiesterase inhibitors, also …

Estimation Of Body Density In Adolescent Athletes, W G. Thorland, G O. Johnson, G D. Tharp, T J. Housh, C J. Cisar

Craig J. Cisar

National samples of 141 male and 133 female highly-trained adolescent athletes were studied to derive anthropometric-based equations predicting body density. Anthropometric measures included skinfold thicknesses at seven sites, circum- ferences at 14 sites, and diameters at nine sites. Criterion measures of body density were determined by underwater weighing with corrections for residual lung vol- ume based on the oxygen dilution method. Variable selection procedures included factor analysis followed by forward-stepping regression and polynomial analysis. For both the male and female samples, two quadratic equations utilizing either the sum of three or seven skinfold measures were derived. Within the male sample, …

The Role Of Biogenic Amines In The Regulation Of Exocrine Gland Function: A Possible Mechanism For The Pathogenesis Of Cystic Fibrosis, A. Tenenhouse, E. Yu

Edward Yu

No abstract provided.

Investigations Of The Potential Effects Of Underwater Noise From Petroleum Industry Activities On Migrating Gray Whale Behavior. Phase Ii: January 1984 Migration, Charles Malme, Paul Miles, Christopher Clark, Peter Tyack, James Bird

James E Bird

The applied research discussed in detail in this report supplements the work performed during the 1983 southbound and northbound migrations of the gray whale, Eschrichtius robustus, in the Monterey, California region. The objective of both phases has been to determine the degree of behavioral response of migrating gray whales to acoustic stimuli associated with oil and gas exploration and development activities. The results of that earlier work were presented in Bolt Beranek and Newman Inc. Report No. 5366* This companion document extends the 1983 research effort, adding to the statistical data base through measurements of behavioral response of the January …

Larval Parasitism Of Psilocorsis Spp. (Lepidoptera: Oecophoridae), Leaftiers Of Central Missouri Oaks, J. Pasek, W. Kearby

Judith E Pasek

Larval parasitism of 3 Psilocorsis species in central Missouri forests averaged 22% for the years 1977-1979. Twenty-three species of parasitoids were reared in the laboratory from the larvae collected. Seventeen species emerged from P. reflexella Clemens, 14 from P. quercicella Clemens, and 10 from P. cryptolechiella (Chambers). The most abundant parasitoids were the braconids Apanteles n. sp., Agathis calcarata (Cresson), and A. cincta (Cresson); the eulophid Elachertus proteoteratis Howard; the ichneumonid Diadegma psilocorsis Walley; and the 3 closely related pteromalids, Perilampus fulvicornis Ashmead, P. prothoracicus Smulyan, and P. n. sp. Elachertus proteoteratis was reared only from P. reflexella. Twenty-three new …

Tva Fluid Fertilizers Chapter Seven - Suspension Fertilizers - Production And Use, J Getsinger, Frank Achorn, George Hoffmeister, Robert Mikkelsen

Robert Mikkelsen

No abstract provided.

Extracellular Enzyme Production By Rhizopus And Mucor Species On Solid Media, D P. Thompson, Broderick Eribo

Broderick Eribo

Intensity As A Third Factor Of Disturbance Regime And Its Effect On Species Diversity, George P. Malanson

George P Malanson

No abstract provided.

Chapter Six - Liquid (Solution) Fertilizers, Frank P. Achorn, Lawrence C. Faulkner, Robert Mikkelsen

Robert Mikkelsen

No abstract provided.

Tva Fluid Fertilizers Chapter Three - Physical Properties Evaluation Aspects, T M. Jones, H L. Balay, Robert Mikkelsen

Robert Mikkelsen

No abstract provided.