Life Sciences Commons^™

Changes In Tenderness And Collagen Of Beef Semitendinosus Muscle Heated At Two Rates, Marjorie Porter Penfield

Doctoral Dissertations

Tenderness, an important quality attribute of meat, is affected by many factors, including rate of heating. The purpose of this investigation was to study the changes occurring in beef semitendinosus muscle and intramuscular connective tissue heated at rates comparable to oven roasting at 93 and 149°C. The sequence of changes occurring during heating was followed by evaluating samples heated to four end points, 40, 50, 60, and 70°C. Cores of meat and isolated connective tissue samples in buffer were heated in a water bath "programmed" to produce the desired rate of heating.

As internal temperature increased Warner Bratzler shear values …

Protein-Phospholipid Interactions In Heated Phospholipid Emulsions Containing Bovine Myoglobin Or Sarcoplasmic Proteins, Sharon Lynn Melton

Doctoral Dissertations

A simplified procedure for determination of myoglobin concentration in aqueous muscle extract was developed. The procedure was used in an investigation of possible interactions between phospholipids and bovine myoglobin, either isolated or as a component of sarcoplasmic proteins. Investigation of the possible interactions was carried out as follows. Solutions containing myoglobin or sarcoplasmic proteins and emulsions (phospholipid, sarcoplasmic protein-phospholipid, and myoglobin-phospholipid) were heated from 25°C to end point temperatures up to 77°C. The following measurements were made on all protein dispersions; (1) pH; (2) percent protein remaining dispersed; (3) myoglobin concentration; (4) available lysine, basic group and acidic group equivalents …

Fluometuron And 2,4,5-T Residues In Soil, Sediment, Runoff Water, And Percolation Water, Glenn Gray Davis

Doctoral Dissertations

The rates of disappearance of 1,1-dimethyl-3-(a, a, a-trifluoro-m-toly1) urea (fluometuron) and the propylene glycol butyl either esters and a triethylamine salt of (2, 4, 5-trichlorophenoxy) acetic acid (2, 4, 5-T) from the application site in field plots and lysimeters were determined. Residual herbicide concentrations were estimated for field plot soil, runoff water collected in the plots after rainfall, and permanently impounded drainage water from the plots. Bioassays, spectrophotometry, and gas-liquid chromatography were utilized to detect residual concentrations of the three compounds. Linear and multicurvilinear equations were developed from known concentrations of the herbicide for predictions of residue amounts …

The Effects Of Dietary Supplements On Bone Density And Nutritional Status Of Elderly Women, Glenda Sue Thompson

Doctoral Dissertations

Seventy-six ambulatory women with a mean age of 68 years participated in a 12-month study of the effects of fluoride, with and without multivitamin and calcium phosphate supplements, on nutritional status including bone density. Mean daily nutrient intakes calculated from 4- to 7-day weighed food intakes were 15 19 kcal including 15% from protein and 36% from fat; others were 797 mg calcium, 1000 mg phosphorus, and 8.6 mg iron. Mean intakes by 59 women who were not receiving vitamin supplements were 5800 IU of vitamin A and 35 mg of ascorbic acid. Mean blood hemoglobin was 13.9 g/100 ml; …

Isolation And Characterization Of A High Energy Iron-Sulfur Protein From Mammalian Cells, Beth Feland

Doctoral Dissertations

A sulfur-containing protein (S-protein) was proposed to be an intermediate in the sulfation of cellular constituents containing ester sulfate after it was observed that S-protein isolated from the particulate fraction of the cell was unaffected by avitaminosis E, the stress of malathion intoxication or the level of inorganic sulfate in the diet. The present investigation was undertaken in an attempt to identify the cellular role of the S-protein in sulfate utilization.

The role of the S-protein as a possible intermediate in the sulfation of ester sulfates was determined using both a natural sulfate acceptor, mucopolysaccharide, and an artificial sulfate acceptor, …

Staffing Patterns Of Dietetic Clinics, Katherine Hooper Benson

Doctoral Dissertations

Responsibilities and time demands of the dietetic clinic staff within institutions containing dietetic internships were investigated. Information was obtained from a questionnaire and observation of the diet instruction time records at the Dietetic Clinic at The University of Tennessee Memorial Research Center and Hospital (UTMRCH). The sample consisted of 45 dietetic clinics whose directors returned the completed instrument.

The staffing patterns of the dietetic clinics varied widely. There was a broad range of educational levels, man-hours worked, and defined responsibilities in the department, institution and community of the personnel in the participating clinics. Time averages are presented for some responsibilities. …

The Effects Of Age And Acid Stress On Bone And Renal Responses Of Rats, Grace Kathleen Newell

Doctoral Dissertations

The effects of age and acid stress on bone and renal responses in rats were investigated. Albino, male weanling rats and male 10-month old retired breeder rats were maintained on a commercial laboratory chow until they were 4 months and 16 months of age, respectively, and then transferred to semi-synthetic experimental diets, containing either 500 mg or 100 mg calcium per 100 g diet, with or without 2% ammonium chloride as an acid stress. The rats remained on the experimental diets 9 months, that is, until the "young" animals were 13 months and the "old" ones were 25 months of …

Soil-Solution Equilibration Parameters And Their Relationship To The Accumulation Of Potassium By Ryegrass, Samuel Kincheloe

Doctoral Dissertations

Three Tennessee soils (Hartsells, Maury and Grenada) were investigated with respect to the soil-solution equilibration parameters and the content of potassium in ryegrass grown in a greenhouse. The soils were fertilized with N, P and K which was varied from 0-100 ppm added to the soil. Two harvestings of ryegrass were made. The content of K, Ca and Mg in the ryegrass was measured. Soil samples were taken immediately following the first harvesting and subjected to the soil-solution equilibration technique. Two forms of equilibration curves resulted. Seven of the 33 equilibration curves were curvilinear in form, whereas the remaining 26 …

The Influence Of Initial Cow Weight On Progeny Performance And Tdn Efficiency In Production Of Slaughter Cattle, James Burkett Neel

Doctoral Dissertations

Data utilized in this study were from records (collected over a two-year period) of 45 Angus cow-calf pairs in which both the individual TDN consumption of the cows over a twelve month period and the individual TDN consumption of the calves from birth to slaughter (excluding TDN provided by milk) were recorded. The objectives of this study were to determine total digestible nutrient (TDN) consumed by cows of various sizes and weights, to determine the TDN intake of both cow and calf per unit weight of slaughter calves which varied in growth potential, to establish weights at which maximum TDN …