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Articles 10261 - 10290 of 10916
Full-Text Articles in Entire DC Network
Carboxymethylcellulose As A Carrier For Follicle Stimulating Hormone In The Female Rat And Bovine, C. Leroy Johnson
Carboxymethylcellulose As A Carrier For Follicle Stimulating Hormone In The Female Rat And Bovine, C. Leroy Johnson
Electronic Theses and Dissertations
A series of biological assays were conducted to compare physiological saline (PSS) and carboxymethylcellulose (CMC) as carriers for follicle stimulating hormone (FSH) and to determine the optimum ratio of FSH to CMC. Constant individual dosages of 0.5 mg FSH were injected into a total of 384 immature female rats in four experiments. Treatments included single injections of FSH in PSS, FSH in 1 percent CMC at ratios (mg FSH: ml CMC) OF 1:3, 1:2, 1:1, 2:1, 3:1, 5:1 and FSH in 2 percent CMC at a ratio of 1:1. Parameters of primary and secondary response were ovarian and uterine weight, …
Evidence For The Presence Of Two Nucleases In Barley Tissue And The Influence Of Genotype On Their Properties, Clay G. Johnson
Evidence For The Presence Of Two Nucleases In Barley Tissue And The Influence Of Genotype On Their Properties, Clay G. Johnson
Electronic Theses and Dissertations
Several lines of evidence have shown that genetic variability exists within the barley species (Hordeum vulgare L.) with respect to the kinetics and specificity of yeast ribonucleic acid degradation. Initial efforts demonstrated that ribonuclease (RNase), in the crude soluble protein fraction from the cultivar Dicktoo, was inhibited by KC1 and phosphate. RNase activity was enhanced if heated to 60 C for short periods. In contrast, RNase in the crude soluble protein of the cultivar Tennessee Winter showed no altered response by either KC1 or phosphate. Maximal RNase activity was at pH 5.0 for extracts of both cultivars (0.16 M KC1), …
Estimation Of N Availability And No3-N Movement In Soils, Raymond Charles Ward
Estimation Of N Availability And No3-N Movement In Soils, Raymond Charles Ward
Electronic Theses and Dissertations
Objectives of this study were: (a) to evaluate several N soil tests that are used to estimate soil N availability, and (b) to measure the distribution of inorganic N in the soil profile after an application of fertilizer N. Small grain yield response from an application of 17, 34, or 67 kg N/ha was used as the parameter of N availability. These parameters were related to 23 independent variables by use of a step wise multiple regression program. Nitrogen soil tests and climatic factors (rainfall and temperature) were the independent variables involved in the analysis. Nitrogen soil tests included were …
Effects Of Manganese Chloride On Gravid Gilts And Newborn Pigs, Dale A. Wade
Effects Of Manganese Chloride On Gravid Gilts And Newborn Pigs, Dale A. Wade
Electronic Theses and Dissertations
Excessive dietary manganese in young mammals has depressed hemoglobin levels, red blood cell synthesis and growth in some investigations, while in other research these were increased. Toxic levels, mode of action and specific physiological effects are unknown although manganese, cobalt and iron appear to compete for absorption mechanisms. Manganese functions in enzyme systems and in carbohydrate and lipid metabolism, is present in red cells and plasma and may be incorporated into the hemoglobin molecule. Gravid gilts were utilized in these investigations since piglet anemia is an economic problem and manganese effects in swine have not been fully defined. Gilt rations …
Amino Acid Supplementation Of Low Protein Layer Diets, Harlal Choudhury
Amino Acid Supplementation Of Low Protein Layer Diets, Harlal Choudhury
Electronic Theses and Dissertations
Experiments were conducted at the South Dakota State University Poultry Research Center to study the effects of amino acid supplementation of low protein diets on performance of laying type hens. Hans, housed in 8-inch cages, were fed at 24 weeks of age typical 16% protein corn-soy diets diluted with glucose to 10.8% protein and supplemented with 0.15% DL-methionine, 0.19% L-lysine and 0.04% DL-tryptophan. After about 20 weeks of depletion, supplements of 0.05 and 0.1% DL-threonine and DL-valine and 0.1% DL-isoleucine alone and in all combinations were fed for a further period of 16 weeks using a factorial design. Individual supplements …
Bionomics Of A Greenbug Parasite Lysiphlebus Testaceipes (Cresson), Barrington M. J. Tyler
Bionomics Of A Greenbug Parasite Lysiphlebus Testaceipes (Cresson), Barrington M. J. Tyler
Electronic Theses and Dissertations
The greenbug, Schizaphis graminum (Rondani), is a major pest to grain crops in the Great Plains states. In 1968, 7.3 X 106 acres of sorghum were infested in nine of these states. The loss of sorghum in Kansas alone was estimated at lJ.5 X 106 bushels. In 1969 and 1970 the combined South Dakota recorded sorghum yield and control losses were over $2.6 X io6 (USDA 1970 and 1971). The greenbug is an economic vector for diseases of winter wheat, barley, oats, sorghum, and cane. Severe infestations on winter wheat have led to reduced crop cover and soil erosion. S. …
A Study Of The In Vitro Drug Availability Of Various Brands Of Prednisolone Tablets, Robert E. Northern
A Study Of The In Vitro Drug Availability Of Various Brands Of Prednisolone Tablets, Robert E. Northern
Electronic Theses and Dissertations
No abstract provided.
Effects Of Polychlorinated Biphhenyls In The Ring-Necked Pheasant, Robert Bernard Dahlgren
Effects Of Polychlorinated Biphhenyls In The Ring-Necked Pheasant, Robert Bernard Dahlgren
Electronic Theses and Dissertations
In 1970 and 1971, cock pheasants (Phasianus colchicus) were given single capsules weekly containing 0 and 25 mg polychlorinated biphenyls (PCB), Aroclor 1254, and hens were given O, 12.5, and 50 mg. Egg production was reduced (P<0.01) in the hens given 50 mg PCB both years. Fertility, determined by visual inspection of incubated eggs, was unaffected by PCB. Hatchability was lowest in the group of hens given 50 mg in both years but significantly lower (P<0.01) only in 1971. PCB adversely affected the viability of the embryo both years, as the number of eggs pipped but not hatched in PCB groups was higher (P<0.05). PCB did not affect eggshell thickness. Behavior on the visual cliff shortly after hatching was affected among offspring of hens given 50 mg PCB in 1970 (P,0.01). Offspring of hens given 50 mg chose the visually-deep side of the cliff. No differences in behavior on the visual cliff were evident in 1971. Response to hand catching of offspring was affected in 1970 (P <0.01). The ability of penned pheasants to avoid hand capture was least where both parents received PCB, followed by those where hens only, cocks only and neither parent received PCB. No differences in response to hand capture among groups were found in 1971. Weights of chicks from hens on 50 mg were lower (P<0.01) at 6 weeks of age in 1970. This effect was not seen in 1971. Survival of chicks in brooders to 6 weeks of age was lower (P<0.01) in offspring of hens given 50 mg PCB weekly in 1970. No differences were found among offspring of treatment groups in 1971. Survival from 6 weeks of age to fall was similar in all groups. Overall survival from hatching to fall was less (P<.0.05) in offspring of hens given 50 mg weekly in both years combined. No differential effect was found between sexes for survival. PCB in doses varying front 10 mg to 210 mg daily caused hyper-excitability, weakness, tremoring, lack of appetite, lack of feathers, and a comatose death. Birds 11-weeks old given 10 or 20 mg PCB daily, birds 6 to 9 months old given 50 or 100 mg each 3.5 days, and adult hens given up to 50 mg once a week continued to eat. Eleven-week old birds given 210 mg daily stopped eating or those given 210 mg daily, the heaviest birds lost the greatest percentage of their weight (15 to 31 percent) before death occurred (1.3 to 4.3 days). Birds intentionally starved at the same time lost a greater percentage of weight (27 to 51 percent) before death (2.3 to 8.6 days). Some adult hens were given a single 50-mg capsule and samples of whole body, brain, liver, muscle, eggs, and feces were analyzed to determine patterns of storage and excretion. Levels of PCB were highest at 12 hours after capsule administration. Residues were highest in liver, followed by brain and muscle over 28 days following the single 50-mg capsule. From 94 to 98 percent of the administered dose was absorbed and 40.5 mg of the 50mg were in the body after 28 days. Hens were in a state of low egg production and excreted 4.2 mg in the eggs and 4.0 mg in the feces over 28 days. Excretion in the egg could be an important means of ridding the body of PCB. Four hens from the 1970 breeding experiment, given 17 capsules weekly containing 12.5 mg PCB and killed 1 week following the last capsule, had from 37 to 56 percent of the administered dose in their bodies. Four hens on the 50-mg level in 1970 had from 60 to 82 percent of the dose given. Five hens given 12.5 mg weekly for 16 weeks in 1971 had an average of 23.8 ppm PCB in their bodies 1 week after the last capsule, three hens had an average of 13.6 ppm after 3months on a clean diet, and three others had an average of 20.9 ppm after 6 months. Excretion was variable and slow. An analysis of brain, liver, and muscle tissues from dead and surviving birds fed PCB at various levels showed that brain residue levels from 300 to 400 ppm wet weight were indicative of death from FCB toxicosis. Liver and muscle levels were too variable to be useful in assessing cause of death. Administration of PCB decreased weights of heart and spleen (P <0. 01) at all levels given and increased weights of kidneys and livers in birds given 10- and 20-rng doses daily (P <0. 01) but not in birds given 210 mg daily. Splenic atrophy, where spleens were small, pale-tan color, and had wrinkled capsules resulting from depletion of lymphatic nodules, was characteristic of birds given PCB. PCB and dieldrin were given singly and jointly, and only additive, not synergistic, effects were noted. Livers of wild pheasants from Pennsylvania, Indiana, and South Dakota had no more than 2 ppm PCB. This indicates low-level contamination.
Studies On Reaction Of Mimosine With Various Amines And Effects Of Mimosine On Tyrosine Decarboxylation, Paul D. Ballata
Studies On Reaction Of Mimosine With Various Amines And Effects Of Mimosine On Tyrosine Decarboxylation, Paul D. Ballata
Electronic Theses and Dissertations
As early as 1897 the toxic effects of mimosine were observed and animals ingesting mimosine showed symptoms of hair loss, infertility, and retardation of growth. Mimosine occurs naturally in leguminous plants indigenous throughout the tropics of the world. Since the forage of these plants has a protein content as high as alfalfa and is relished by all kinds of livestock, the mechanism of the toxicity of mimosine should be explained. Although the effects of mimosine have been known for a long time, the reason or mechanism for these effects has not been explained. Much work has been done on the …
Biologies Of Altica Subplicata (Leconte) And Disonycha Alternata (Illiger) (Coleoptera: Chrysomelidae) Found On Salix Interior Rowlee, David H. Deswarte
Biologies Of Altica Subplicata (Leconte) And Disonycha Alternata (Illiger) (Coleoptera: Chrysomelidae) Found On Salix Interior Rowlee, David H. Deswarte
Electronic Theses and Dissertations
Disoqycha alternata (Illiger) and Altica subplicata (LeConte) are two flea-beetles characteristically found feeding on Salix spp. The only studies done to date on these two genera are taxonomic, either local faunistic or descriptive works. Both Disonycha and Altica have been taxonomically studied for limited zoogeographic areas, but many of these works are old, incomplete, and in need of revision. No previous work has been done on the biologies of either of these two species. This paper includes morphological descriptions of the larvae of D. alternata and A. subplicata and outlines their life histories. A few notes on behavior have also …
A College Characteristics Instrument Measure Of Absolute Change Between Freshman Expectations And Perceptions Of A College Environment As Related To Grade Point Average And Sex Of The Student, Zdzislaw Piotrowski
Electronic Theses and Dissertations
The general thesis underlying this study is that a student's absolute change between expectations and perceptions of a college environment is related to his performance and sex. Two null hypotheses were generated. The hypotheses as related to the methodology and the CCI instrument of the study were: 1. There are no significant differences in the freshman change or C-score on the basis of sex of the student. 2. There are no significant differences in the freshman change or C-score on the basis of grade point average grouping. The population was divided into three groups with male and female subdivided within …
Physiological Regulation Of Cyclic Flowering In Flax, Aurora Salazar Hovland
Physiological Regulation Of Cyclic Flowering In Flax, Aurora Salazar Hovland
Electronic Theses and Dissertations
The flowering pattern of flax (Linum usitatissimum, L.) is cyclic in nature with periods of blossoming separated by periods of rest. To study the regulation of flowering cycles, four experiments were conducted. The first two dealt with nutritional aspects of cyclic flowering by imposing environmental stresses which conceivably might regulate flowering pattern nutritionally. The third and fourth experiments dealt with regulation from hormonal systems and included in vitro regulation of bud growth by growth regulators as well as characterization of endogenous hormonal systems by fluorimetry and bioassays. In the first experiment, the effects of light intensity, temperature, nitrogen and defoliation …
A Study Of Selected Demographic Factors Associated With Changes In Age Structure In The Population Of South Dakota From 1960-1970, Robert Todd Wagner
A Study Of Selected Demographic Factors Associated With Changes In Age Structure In The Population Of South Dakota From 1960-1970, Robert Todd Wagner
Electronic Theses and Dissertations
A study of the population profile for South Dakota for 1960 and 1970 was made to determine: (1) the changes that transpired in the composition 0£ the population for the age categories 0-4, 0-14, 15-34, 35-64, 65+ and 75+; (2) the variation in the changes observed in the selected age categories when controlled according to residence, sex and race differentials; and (3) the extent to which changes in the basic demographic components of migration, fertility and mortality are associated with changes in the age interval 0-4. Each county in South Dakota was employed as the unit of analysis, and census …
Pheasant Production Using Wild Cocks And Penned Game-Farm Hens, Michael R. Grode
Pheasant Production Using Wild Cocks And Penned Game-Farm Hens, Michael R. Grode
Electronic Theses and Dissertations
Pheasant production using free-flying wild cooks and penned game-farm hens was evaluated during 1971. Hens were placed in 0.5-acre pens to compare production at density levels of 10, 20, and 40 hens per acre. Wild cooks entered the 0.5-acre pens the day following introduction of the game-farm hens. The greatest numbers of cooks were observed in the pens with the highest density of hens. Censusing in mid-March indicated a population of 12 to 15 wild cooks in the vicinity of the study pens. A known mortality of 31 hens occurred and percentage mortality was similar at each density level. Pulling …
Use Of Eelctrophoresis To Determine Populations Of Pheasants In South Dakota, David George Montag
Use Of Eelctrophoresis To Determine Populations Of Pheasants In South Dakota, David George Montag
Electronic Theses and Dissertations
The ring-necked pheasant (Phasianus colchicus) is an important game bird, and various management techniques have been implemented in its behalf. One of the most common practices has been transplanting or stocking wherein pheasants are introduced into an area with a depleted population in hopes of increasing pheasant production. The effects of such programs are difficult to evaluate since there is no way of knowing if the introduced birds are in any way responsible for production changes which subsequently occur. If the taxonomic characteristics of the native and the introduced populations could be determined, the effect that introduced birds have on …
Effects Of Diethylstilbestrol On Reproduction In The Black-Tailed Prairie Dog, Donald G. Pfeiffer
Effects Of Diethylstilbestrol On Reproduction In The Black-Tailed Prairie Dog, Donald G. Pfeiffer
Electronic Theses and Dissertations
Research was conducted in southwestern South Dakota in 1970 and 1971 to obtain information on the reproductive cycle of the black-tailed prairie dog (Cynomys ludovicianus) and to test effectiveness of diethylstilbestrol as a reproductive inhibitor. Embryo body lengths from 10 pregnant females were compared to body lengths of 14 known day-old young to learn the peak breeding period when an estrogenic chemosterilant would be most effective. Conception dates were obtained for three females by backdating the gestation period. The breeding peak was found to occur in late February and early March in South Dakota. Nine of 11 Prairie dogs were …
Dimensions Of Professionalism : Nurses In A Vocational Education Setting As Compared To Other Vocational-Technical Teachers / By Marvin Lanier Sanders, Marvin Lanier Sanders
Dimensions Of Professionalism : Nurses In A Vocational Education Setting As Compared To Other Vocational-Technical Teachers / By Marvin Lanier Sanders, Marvin Lanier Sanders
Electronic Theses and Dissertations
No abstract provided.
Economic Feasibility Of Crawfish Culture In Northern Mississippi/ By Seth Berry Stalcup, Seth Berry Stalcup
Economic Feasibility Of Crawfish Culture In Northern Mississippi/ By Seth Berry Stalcup, Seth Berry Stalcup
Electronic Theses and Dissertations
No abstract provided.
A Study Of Chemotaxis In Physarum Polycephalum Schw., Linda Sue Donnelly
A Study Of Chemotaxis In Physarum Polycephalum Schw., Linda Sue Donnelly
Electronic Theses and Dissertations
No abstract provided.
Implications For Music Education From Susanne K. Langer, Abraham H. Maslow, Marshall Mcluhan, Jerome S. Bruner, Max Kaplan, And Jean Piaget / By Don R. Lewis, Don R. Lewis
Electronic Theses and Dissertations
No abstract provided.
Social Distance Attitudes Of White College Students Toward The Negro, Laddie L. Eaves
Social Distance Attitudes Of White College Students Toward The Negro, Laddie L. Eaves
Electronic Theses and Dissertations
No abstract provided.
Morphology And Chemical Composition Of Cannabis Sativa L., Man Hee Lee
Morphology And Chemical Composition Of Cannabis Sativa L., Man Hee Lee
Electronic Theses and Dissertations
No abstract provided.
The Synthesis Of Certain 4-Anilidopiperidines As Potential Analgetics, Danny Boyd Hale
The Synthesis Of Certain 4-Anilidopiperidines As Potential Analgetics, Danny Boyd Hale
Electronic Theses and Dissertations
No abstract provided.
Psychodrama : A Means Of Attaining Human Wholeness, Linda Lu Mcgahey
Psychodrama : A Means Of Attaining Human Wholeness, Linda Lu Mcgahey
Electronic Theses and Dissertations
No abstract provided.
A Study Of Gas-Exchange In The Pulmonary Capillary Blood Flow, Lu-Yuan Lee
A Study Of Gas-Exchange In The Pulmonary Capillary Blood Flow, Lu-Yuan Lee
Electronic Theses and Dissertations
No abstract provided.
A Theatre Management Portfolio, Jerrol Lynn Kellum
A Theatre Management Portfolio, Jerrol Lynn Kellum
Electronic Theses and Dissertations
No abstract provided.
A Quantative Study Of Cannabinoids During The Growing Season Ofa Turkish Variant Of Cannabis Satavia L., Ricardo Oswaldo Guerrero
A Quantative Study Of Cannabinoids During The Growing Season Ofa Turkish Variant Of Cannabis Satavia L., Ricardo Oswaldo Guerrero
Electronic Theses and Dissertations
No abstract provided.
Religion In The Novels Of Theodore Dreiser, Katherine Speed Burt
Religion In The Novels Of Theodore Dreiser, Katherine Speed Burt
Electronic Theses and Dissertations
No abstract provided.
An Experimental Study Of Oxygen Uptake By Loring Sediment In Agitated Vessels / By Herng Huei Tseng, Herng Huei Tseng
An Experimental Study Of Oxygen Uptake By Loring Sediment In Agitated Vessels / By Herng Huei Tseng, Herng Huei Tseng
Electronic Theses and Dissertations
No abstract provided.
Enteric Bacteriophages In Saint Louis Bay, Mississippi, Joe Oliver Graves
Enteric Bacteriophages In Saint Louis Bay, Mississippi, Joe Oliver Graves
Electronic Theses and Dissertations
No abstract provided.