Nutrition Commons^™

Effects Of Stabilizers And Ph Adjustments On Milk Proteins In Uht-Treated Citrus Juice/Skim Milk Blend Drink, Sandra M. Newman

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A UHT-processed skim milk (85%)/orange juice (15%) drink was developed. Product integrity and stability were maintained by two methods. Proper homogenization of the blend before UHT processing stabilized a drink formulation containing .25% carboxymethyl cellulose and .025% carrageenan. Adjusting the pH of the blend (pH 6.3 and 6.5) resulted in a different stabilization. After 28 days at room temperature, settling of milk solids was 5.2% of volume height in the prehomogenized sample and 86.9% of volume height in the same blend that had not been homogenized prior to UHT processing. After storage, the two treatments were analyzed to verify that …

A New Method For Measuring Macroparticulate Systems Applied To Measuring Syneresis Of Renneted Milk Gels, Jonathan R. Maynes

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Syneresis is an integral part of cheese manufacture. The rate and extent of syneresis affect the properties of cheese. There are many factors that affect syneresis, but measured results vary because of inaccuracies in measuring techniques. To better control syneresis, an accurate mathematical description must be developed. Current mathematical models describing syneresis are limited because of inherent error in measuring techniques used to develop them. Developing an accurate model requires an accurate way to measure syneresis.

The curd becomes a particle in a whey suspension when the coagulum is cut. The most effective technique to measure particle size, without interference, …

Physical And Functional Events Involved In Conjugal Transfer Of Lactose Utilization In Lactococcus Lactis Subsp. Lactis, Hua Wang

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The nature of the cell surface components involved in donor cell clumping (Clu⁺) and the relationship of Clu⁺ to high frequency conjugal transfer of lactose utilization (Lac) in Lactococcus lactis subsp. lactis ML3 was examined. Lactose positive (Lac⁺), Clu⁺ transconjugants, containing a novel 104 kilobase Lac plasmid, were obtained by mating ML3 with LM2301. When used as Lac+ donors in second round matings, these transconjugants transferred Lac at high frequencies ranging from 10^-2 to 10^-4 transconjugants per donor CFU. Treatment of donor cells with EDTA and EGTA containing solutions or proteolytic enzymes …

The Role Of Lactose In The Age Gelation Of Ultra-High-Temperature Processed Concentrated Skim Milk, Venkatachalam Narayanaswamy

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this research was to relate lactose reactivity and age gelation of UHT processed concentrated milk. Skim milk was pasteurized, diafiltered batchwise to reduce lactose concentration to less than 0.05%, and UF concentrated to 3X (one-third volume reduction). Lactose and sucrose were then each added at 3% or 6% w/v to part of the concentrate. The five samples, control (

All samples stored at 4°C and 20°C gelled after 21 weeks of storage. The viscosity changed slightly during the first 19 weeks of storage but increased suddenly (> 100 cPs) just before gelation. Samples stored at 35°C did …

The Effect Of Computer-Assisted Nutrition Education On Nutrition Knowledge, Nutrition Status, Dietary Compliance, And Quality Of Life Of Hemodialysis Patients, Julianne Stewart

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study was conducted to assess the effect of nutrition education utilizing computerized dietary analysis on nutrition knowledge, dietary compliance, nutrition status, and quality of life in hemodialysis patients. Twenty patients of the Bonneville Dialysis Center in Ogden, Utah voluntarily agreed to participate in this six-month study. All participants completed quality of life assessments, the Beck Depression Inventory© (BDI), and a nutrition knowledge assessment pre- and post-study. Patients in the treatment group (n=12) completed monthly 3-day food records which were analyzed by Computrition® nutrient analysis software. Results were discussed with the patients during one-on-one education sessions. Control patients (n=8) completed …

Phosphorus Sorption By Gravels In Lateritic Soils, D. M. Weaver, G. S.P. Ritchie, R. J. Gilkes

Food Science and Nutrition

The effect of sesquioxidic gravels (>2 mm size fraction) on phosphorus sorption by two gravelly lateritic soils was investigated by phosphorus sorption experiments, X-ray diffraction, autoradiography and electron microscopy.In one soil the abundance and size of gravels decreased downslope. As the gravel content of both soils increased (13-61%), the proportion of large (>8 mm) gravels increased (0-70%). Phosphorus sorption increased in the order: (>2 mm fraction) < (whole soils) < (2 mm) decreased with increasing gravel size and increased with increasing time. Phosphorus sorption by whole soils decreased with increasing gravel content. Phosphorus sorption by the >2 mm fraction was principally by the external surfaces of the gravels. The estimation of phosphorus application rates for lateritic soils depended on the amount of phosphorus required by the plant …

The Effect Of Canteen Menu On Nutritional Knowledge, Attitudes And Behaviour Of Year Five Students, Sharon Mcbride

Theses: Doctorates and Masters

Eating habits are learned during childhood, and patterns of behaviour established in childhood have important health ramifications throughout life. Over half of all deaths in Australia are linked to diet with over-consumption of saturated fat, sugar and salt, and lack of fibre being identified as particular problem areas. Nutrition education is an important component of primary health education curricula, and yet school canteens, and integral part of the school environment, do not necessarily offer healthy food choices that support nutrition instruction in the classroom. This study investigated the effect of canteen menu on student knowledge and attitudes toward nutrition and …

How To Turn Your Kitchen Into A Lab!, Charlotte P. Brennand Ph. D.

Archived Food and Health Publications

Publication goes over the steps to a proper experiment and teaches how to do experiments in your own kitchen.

Drug Residues And Food Safety, Clell V. Bagley Dvm

Archived Food and Health Publications

Publication discusses drug residues in food animal products and food safety concerning drug residues.

The Effects Of A Commercial Nutritional Supplement Combining Amino Acids, Glutamine, Carnitine And B-Vitamins On The Physiological Responses To Ultraendurance Triathlon Training, Performance And Recovery, Mary V. Mitchell

Human Movement Studies & Special Education Theses & Dissertations

In a placebo, double blind, randomized design, five male triathletes participated in a simulated triathlon which examined the physiological responses of a commercial nutritional supplement. The supplemental protocol included 7.1 gm·d^-1 of an amino acid complex with B-vitamins (AA) and between 2.2-7.3 gm·d^-1 META-MAX™ containing leucine, isoleucine, valine, glutamine and carnitine in which quantities were based on the athletes training volume. A maltodextrin carbohydrate replacement drink was also included in the protocol. The placebo was an isocaloric lactose substance. The supplements were ingested for 14 d prior to the simulated triathlon and then for 3 d after the …

Enhanced Attraction To Blood By Pigs With Inadequate Dietary Protein Supplementation, David Fraser, D. E. Bernon, R. O. Ball

Nutrition Collection

In two experiments, 60 individually penned growing pigs were exposed daily to two sections of cotton cord, one of which had been soaked with pigs' blood and subsequently dried, while the other was plain. The animals' preference for chewing-on the blood-impregnated cord was quantified by direct observation. When fed a standard "control" diet of corn, barley, and soybean meal with mineral and vitamin supplements, the pigs had a clear but modest preference for chewing the blood-impregnated cord. Omission of the protein supplement (soybean meal) from the diet for 4 wk led to a major increase in attraction to blood and …

Serum Vitamin B-12 Levels And Urinary Methylmalonate Excretion In Total Vegetarians, Shari H. Patchett

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this research project was threefold: 1) to determine the present serum vitamin B-12 status in a select group of strict or total vegetarians all of whom had been vegetarian for six months or more. 2) to determine the daily intake of vitamin B-12, total calories, protein, % calories as fat, folic acid, and crude fiber on a total vegetarian diet. 3) to observe if subjects with low serum vitamin B-12 levels and low intakes of oral vitamin B-12 also had elevated methylmalonic acid (MMA) in the urine.

Six of the 19 serum vitamin B-12 levels were below …

Effects Of Heat Treatment Of Ultrafiltered Milk On Its Rennet Coagulation Time And On Whey Protein Denaturation, Bashir H. Yousif

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this research was to determine the effects of heating (including heating to ultra-high temperatures) homogenized ultrafiltered whole and skim milks on whey protein denaturation and milk's subsequent rennet coagulation properties: coagulation time, curd firmness, and microstructure.

Whole and skim milk samples were ultrafiltered using a spiral wound ultrafiltration membrane system. Samples were preheated to 72°C for 58 s, held for 8 s then heated to 72, 89, 106, 123, or 140°C for more than 97 sand held for 4 s. The milk was then cooled to 60°C and homogenized, further cooled to 30°C, packaged into 120 ml …

Enzyme-Hydrolyzed Retentate For The Development Of A Whipped Topping Mix, Shirley Ann Bond

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Ultrafiltered skim milk concentrated to 20-22% solids was hydrolyzed with a mixture of proteases from Aspergillus oryzae and an acid protease from Aspergillus niger. The enzyme preparation from A. oryzae did not produce bitterness, so the effects of its hydrolyzing action on the whipping properties of the retentate in liquid and powdered forms were examined. Its effect on the amount of soluble nitrogen in the powder was also determined. After inoculation of 250 ml retentate with .05% w/v enzyme, the samples were held in a 45°C water bath. The samples thickened with increasing hydrolysis until syneresis occurred. They also …

Meat Effects On Nonheme Iron Absorption, Yunji Kim

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Studies were undertaken to investigate if gastric acidity and iron chelation to a meat component enhance nonheme iron absorption. Cereal meals, with and without added proteins, were gavaged into iron-deficient rats. The role of iron chelation was investigated by adding sodium phytate, an iron chelator implicated with decreased iron absorption, to the meals. The role of gastric acidity was investigated by treating the rats with cimetidine, which inhibits gastric acid production. In rats with normal acid production, beef, pork and chicken enhanced iron absorption when phytate had been added to the meals, suggesting a role for chelation in meat enhancement …

Factors Affecting Moisture Distribution In 290-Kilogram Stirred-Curd Cheddar Cheese Blocks, Robert S. Reinbold

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this dissertation was to study factors affecting moisture distribution in 290-kilogram stirred-curd Cheddar cheese blocks cooled in stainless steel hoops. Uneven moisture distribution within blocks may create cheese with variable texture and flavor, which can be extremely costly to the producer. The effects of temperature, pH, and vacuum treatment on moisture distribution were investigated. Temperature, pH, moisture, and pressure profiles were presented. Also, comparisons were made between temperature profiles of 290- kilogram stirred-curd Cheddar cheese blocks cooled in stainless steel and in plywood hoops, as well as between temperature profiles of 66-kilogram Swiss cheese blocks cooled in …

Soil Tests For Aluminum Toxicity In The Presence Of Organic Matter: Laboratory Development And Assessment, M. G. Whitten, G. S.P. Ritchie

Food Science and Nutrition

Al toxicity in plants is related to the activity of Al³⁺ and Al-hydroxy monomers in the soil solution, whereas Al complexed with ligands such as fluoride (F), sulphate (SO₄^2-), and oxalate is not toxic. Estimation of toxic Al relies on measurement of “labile”; Al after short contact times with colorimetric reagents or cation-exchange resins. However, shifts in equilibrium may result in non-toxic forms of Al reacting with the complexing agent or resin.

A series of laboratory experiments tested the degree to which labile Al is related to Al³⁺ in simplified media and compared methods of …

Calcium Chloride Extractable Cadmium As An Estimate Of Cadmium Uptake By Subterranean Clover, M. G. Whitten, G. S.P. Ritchie

Food Science and Nutrition

Cadmium (Cd) may accumulate in soils which have been regularly fertilized with phosphate fertilizers which contain Cd originating in rock phosphate. Soil was taken from three sites in the wheatbelt of Western Australia which were estimated to have received different amounts of phosphate fertilizer over the past decade. The pH was adjusted with dilute HCl or CaCO₃. No Cd was added experimentally. The concentration of Cd in the whole tops of Trifolium subterraneum cv Mt Barker grown in a glasshouse pot experiment increased from 0.2-0.8 µg g^-1 dry wt at pH 6.6-6.9 (1:5 0.01 M CaCl …

A Comparison Of Soil Tests To Predict The Growth And Nodulation Of Subterranean Clover In Aluminium-Toxic Topsoils, M. G. Whitten, G. S.P. Ritchie

Food Science and Nutrition

Total Al concentration or pH in 1∶5 10 mM CaCl₂ extracts and exchangeable Al in 100 mM BaCl₂ extracts cannot always distinguish between Al-toxic and Al-nontoxic topsoils. Our objectives were to compare the abilities of different measures of Al and pH in various extracts to predict the effects of acidity on growth and nodulation of subterranean clover. In a glasshouse experiment, Trifolium subterraneum L. cv. Mt Barker was grown in acidic soils from 3 sites in the Western Australian wheatbelt with different histories of phosphate fertilizer application. The pH was adjusted to give a range of …

A Soil Test For Aluminium Toxicity In Acidic Subsoils Of Yellow Earths In Western Australia, S. J. Carr, G. S.P. Ritchie, W. M. Porter

Food Science and Nutrition

Many of the yellow earths in the Western Australian wheatbelt have naturally acidic subsoils which can reduce the yield of wheat grown on them. Current methods of assessing soil acidity cannot identify which soils have subsoil acidity severe enough to restrict wheat yields.

We conducted 53 field experiments at 34 sites in 5 regions over 3 years to determine the relationship between yield of wheat and several different indices for identifying subsoils with toxic concentrations of aluminium, Al. Initially, we identified that the concentration of aluminium, [Al], in the soil solution and in 1 : 5 0.005 M KCl extracts …

Supplementary Feeding Of Weaner Sheep At Esperance, Julian Gardner, Peter Doyle

Journal of the Department of Agriculture, Western Australia, Series 4

Cereal grains, particularly barley, have been the usual supplement fed to weaner sheep during summer and autumn along Western Australia's south coast. This area is a major barley producer, and weather-damaged and other feed quality grain have a ready use. High protein lupin seed, and to a lesser extent silage, have gained wide acceptance recently as alternative supplements. This article discusses the results of the first two of a series of supplementary feeding experiments at Esperance Downs Research Station.

Getting The Best Out Of Weaner Sheep In The Eastern Wheatbelt, Sally Revell

Journal of the Department of Agriculture, Western Australia, Series 4

A study of the growth of Merino weaner flocks over summer and autumn in Western Australia 's eastern wheatbelt during 1989 and 1990 has identified efficient weaner management strategies, and provided a basis for future research and extension needs of this area. The average liveweight of several weaner flocks was unexpectedly low at the start of summer. Weaner flocks may need to be supplemented before the start of summer to prevent undue weight loss at this time.

Phomopsis-Resistant Lupin Stubbles As Feed For Weaner Sheep, Colin Mcdonald, Keith Croker, Jeremy Allen

Journal of the Department of Agriculture, Western Australia, Series 4

The breeding of sweet, narrow-leafed lupins with increased resistance to Phomopsis leptostromiformis, the fungus that causes lupinosis in sheep, is a breakthrough for the summer nutrition of weaner sheep. The new resistant varieties, Gungurru for the medium (325 to 450 mm) rainfall areas and Yorrel for low rainfall areas (less than 325 mm), were released by the Department of Agriculture in 1988.

This article discusses progress in a four-year project which is examining liveweight and wool production of weaners grazing Gungurru stubbles.

History And Analysis Of Food Guides In The United States, Barbara B. Carlson

Health Services Research Dissertations

This work elucidates the development of nutrient-based dietary standards in the United States from the original energy and protein-based standards proposed by Atwater in 1894 to the micronutrient-based Recommended Dietary Allowances revised by the National Research Council in 1989. This qualitative historical research chronicles the development and subsequent revisions of nutrient-based food guides and food guidance models issued in the United States between 1916 and 1991. A literature search of historical food guides, research, and review papers from the fields of nutrition science and education, dietetics, and health science provided primary sources of information for the history. A literature search …

The Effects Of Moderate Exercise Training On Nutrient Intake In Mildly Obese Women, Leann Onasch

Loma Linda University Electronic Theses, Dissertations & Projects

The relationship between moderate exercise training (five 45 min sessions/week, brisk walking at 62+2% V0_2max for 15 weeks) and changes in nutrient intake was investigated in a group of 36 sedentary, mildly obese women, conducted using a two (exercise, EX and nonexercise, NEX groups) x three (baseline, six-, 15-week testing sessions) factorial design, with data analyzed using repeated measures ANOVA. The pattern of change over time between groups for kilocalorie intake tended to be different between groups [F(2,68)=2.50,p=0.089] with the EX group experiencing a significant decrease versus baseline by 15 weeks. Significant group x time interactions were found for …

Delayed Protein Complementation With Common Foods Used In The Middle East, Ladon J. Hilton

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this research was to determine whether whole wheat and lentils, food staples consumed in the Middle East, will exhibit delayed protein complementation when fed in alternating meals. Lentils are limiting in sulfur containing amino acids, especially methionine, while whole wheat is limiting in lysine, and when these proteins are fed together they supplement one another.

Sixty male, Sprague-Dawley weanling rats were divided into six diet groups with ten in each group as follows: diets fed ad libitum; wheat, lentils, wheat and lentils combined; diets pair-fed; wheat and lentils combined, wheat alternating with lentils, lentils alternating with wheat. …

Substrate Concentration, Calcium Concentration And Κ-Casein Hydrolysis In Milk Coagulation, Fenjin He

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Milk coagulation consists of four overlapping phases: enzymic hydrolysis, micelle aggregation, gelation and syneresis. The objectives of this study were to determine the effects of added CaCl₂ on milk coagulation and the relationship between enzymic hydrolysis and micelle aggregation with substrate at different concentrations.

Addition of CaCl₂ to milk is widely practiced in industry and in laboratories. This changes calcium concentration, pH and ionic strength. It is impossible to separate these three variables and investigate each one independently.

Addition of low levels of CaCl₂ shortens coagulation time and increases curd firming rate. Low levels of CaCl_{2 …}

Interrelationships Among Magnesium Deficiency, Ketogenic Diet, And Fasting On Seizure Susceptibility, Hamdia Mohammed Shahwan Ai-Hamdani

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Fasting and ketogenic diet prevent seizures in epileptic children, magnesium-deficient rats and other animal models of seizure disorders. This effect has been attributed to increased levels of circulating ketone bodies. The purpose of this study was to determine the role of serum ketone bodies, measured as beta-hydroxybutyrate (BHB), in preventing audiogenically-induced seizures in weanling rats fed a magnesium-deficient diet for 17 days.

The effect on seizure susceptibility was investigated by feeding a magnesium-deficient diet to weanling rats for 17 days. Fasting and ketogenic diet (dietary medium chain triglycerides, MCT) markedly decreased seizure incidence that was associated with increased serum BHB …

Obstacles Faced By Emergency Food Providers In Serving The Hungry Of Connecticut, Jean Ann Anliker

Storrs Agricultural Experiment Station

No abstract provided.

Prediction Of Zinc Deficiency In Navy Beans (Phaseolus Vulgaris) By Soil And Plant Analyses, J. D. Armour, A. D. Robson, G. S.P. Ritchie

Food Science and Nutrition

Navy beans (Phaseolus vulgaris cv. Gallaroy) were grown with 7 rates of zinc (Zn) in a Zn-deficient gravelly sandy loam in a glasshouse experiment. The plant shoots were harvested 31 days after sowing and the Zn concentration in each of 4 plant parts (YL, young leaf; YOL, young open leaf; YFEL, youngest fully expanded leaf; and whole shoots) was related to the fresh weight of the shoots. The critical Zn concentrations (mgtkg) in the plant parts determined by the 2 intersecting straight lines model were 21.1 for YL (r² = 0.66), 17.1 for YOL (r² = 0.83), …