Open Access. Powered by Scholars. Published by Universities.®

Life Sciences Commons™

Open Access. Powered by Scholars. Published by Universities.®

Louisiana State University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 1951 - 1980 of 2496

Full-Text Articles in Life Sciences

Factors Affecting Plant Location Decisions Of U.S. Broiler Executives, Pramod Sambidi Jan 2003

Factors Affecting Plant Location Decisions Of U.S. Broiler Executives, Pramod Sambidi

LSU Master's Theses

The broiler operations in the United States, which are concentrated in the southeast and south central regions are unevenly distributed within those states. The major concern for Louisiana¡¯s broiler industry is that even though its production is increasing every year it is relatively low compared to many other southeastern states. This study analyzes the relative importance of factors that affect location decision of a broiler complex. A national survey of broiler industry executives is conducted to analyze site-specific factors related to the broiler-complex location problem. Conjoint analysis is used to measure the relative importance of each attribute in the location …

Go to article

Establishing The Economic Impact Of The Green Industry On Louisiana's Economy, Raul A. Pinel Jan 2003

Establishing The Economic Impact Of The Green Industry On Louisiana's Economy, Raul A. Pinel

LSU Master's Theses

The general objective of this study was to provide updated estimates of value of the green industry in Louisiana. Data collection was conducted for the production sector (Nursery Growers and Sod Producers, and Landscape Design, Installation and Maintenance Services) and the Golf Industry. In addition, expenditures on green industry products and services incurred by other sectors were obtained. Among those sectors were churches and cemeteries, public schools (elementary and secondary), public colleges and universities, private schools (elementary, secondary and college/university), parish/city grounds, state parks, road shoulder and median maintenance, and airports. To conduct the surveys, listings from those sectors were …

Go to article

Resistant Rice Starch Development, Siow Ying Tan Jan 2003

Resistant Rice Starch Development, Siow Ying Tan

LSU Master's Theses

This study showed that enzyme treatments were effective in producing resistant starch from rice flour and starch. Rice starch produced higher resistant starch yields than rice flour. The lower resistant starch yields in rice flour could be attributed to the presence of lipids and proteins which were competitively binding to amylose, resulting in decreased recrystallization of amylose. The gelatinization type and incubation periods were not as influential as enzyme treatments in the resistant starch formation. The rapid visco amylograph (RVA) analysis indicated that the gelatinized samples have minimal pasting characteristics since they had been gelatinized prior to enzyme treatments. Pasting …

Go to article

Use Of Urine Ph To Predict Incidence Of Ketosis In Transition Dairy Cows, Amy Elizabeth Beem Jan 2003

Use Of Urine Ph To Predict Incidence Of Ketosis In Transition Dairy Cows, Amy Elizabeth Beem

LSU Master's Theses

Forty-one (10 primiparous and 31 multiparous) Holstein cows were used in an experiment to determine the effects of prepartum dietary energy (PDE) and supplemental Ca-propionate on the incidence of ketosis in transition dairy cows and to evaluate the usefulness of urine pH as a predictor for ketosis. Treatment factors were prepartum dietary energy concentration (normal vs. high) with or without 113.5g Ca-Propionate/day (Nutro Cal®, Kemin Industries, Inc., Des Moines, IA). All cows were fed the same basal diet postpartum. Ca-propionate supplementation continued postpartum. Cows were individually fed and dry matter intakes (DMI) were measured daily. Milk production was measured and …

Go to article

Purification And Antioxidant Activities Of Soybean Isoflavones, Qiju Wu Jan 2003

Purification And Antioxidant Activities Of Soybean Isoflavones, Qiju Wu

LSU Master's Theses

An efficient procedure was developed and used to extract and purify isoflavones from defatted soy flour. The purity of the final product reached 94%. The antioxidant activities of soybean isoflavones (genistein and daidzein purchased from Sigma Chemical Co, and a mixture of isoflavone glycosides extracted from defatted soy flour) were investigated by a cholesterol oxidation model accelerated by 2,2’-azobis(2-methylpropionamidine) dihydrochloride (AAPH). All components exhibited very high antioxidant activities in the inhibition of cholesterol oxidation. Genistein had higher inhibition to the formation of 5,6beta-epoxycholesterol (5,6b-EP) and 7-ketocholesterol (7-keto), while no significant difference was found between the antioxidant activities of daidzein and …

Go to article

A Comparison Of Microbial Communities In Soil With And Without A Sugarcane Cropping, Carolyn Faye Savario Jan 2003

A Comparison Of Microbial Communities In Soil With And Without A Sugarcane Cropping, Carolyn Faye Savario

LSU Master's Theses

Sugarcane (inter-specific hybrids of Saccharum) is grown largely under long-term monoculture production in Louisiana. This can lead to a complex problem termed "yield decline" that results in poor root health and reduced productive capacity of sugarcane. This problem has been documented to be a limiting factor for sugarcane production in diverse regions, including Louisiana, Hawaii, Jamaica, and Australia. Previous work showed that biological factors affect root health and contribute to yield decline. The objectives of this study were to increase our understanding of microbial communities in sugarcane soils, to determine if there are differences in microbial communities associated with sugarcane …

Go to article

Analyzing Changes In Contractual Practices In The Louisiana Nursery Industry, Roberto E. Navajas Jan 2003

Analyzing Changes In Contractual Practices In The Louisiana Nursery Industry, Roberto E. Navajas

LSU Master's Theses

The flow of nursery products through the different market channels has changed over the past decade. As mass-merchandisers’ market share increased, buyers of nursery product imposed conditions on nursery growers in terms of their business practices as well as the presentation of the product itself. This study analyzed changes in contractual terms between buyer and sellers for two market channels; mass-merchandisers and garden centers. The items evaluated were that product information tags be applied, barcode stickers be applied, special containers be used, transportation to retailer be paid by the seller, returnable shipping equipment be supplied by the grower, on-time delivery …

Go to article

Cryopreservation By Pellet Freezing Of Epididymal And Ejaculated Spermatozoa From Male Dogs, Brooke Fahrig Jan 2003

Cryopreservation By Pellet Freezing Of Epididymal And Ejaculated Spermatozoa From Male Dogs, Brooke Fahrig

LSU Master's Theses

In this study, I evaluated the cryopreservation by pellet freezing of spermatozoa from individual dogs. In Experiment I, spermatozoa from 15 pairs of epididymides were suspended in glycerol, frozen as pellets of 10, 50, 100, or 200 μl volumes, and thawed by dilution with TALP (Tyrode's solution plus albumin, lactate, pyruvate). In Experiment II, spermatozoa from 16 pairs of epididymides were suspended in glycerol, dimethyl sulfoxide, or ethylene glycol, frozen as 100 μl pellets, and thawed by dilution with TALP, canine capacitation medium (CCM), or 3% sodium citrate solution. In Experiment III, spermatozoa from 15 pairs of epididymides were suspended …

Go to article

Sensory Characteristics Of Flavored Milk Candies, Noemi Raquel Pavon Jan 2003

Sensory Characteristics Of Flavored Milk Candies, Noemi Raquel Pavon

LSU Master's Theses

A natural milk candy, composed mainly of milk powder, has not been commercially sold in the U. S. market. The milk candy we developed contains calcium and other essential nutrients, which make it a potential food supplement for adults and children. This thesis research was designed to characterize sensory properties of flavored milk candies and to determine the consumer sensory profile driving product acceptance and purchase intent. A descriptive trained panel (n=12) developed a lexicon and evaluated 3 milk candies (plain, chocolate, and coffee) in triplicate using a 15-cm line scale. 335 adult consumers evaluated acceptability of appearance, size/shape, texture, …

Go to article

Consumer Perception And Application Of Edible Coatings On Fresh-Cut Fruits And Vegetables, Sirisha Sonti Jan 2003

Consumer Perception And Application Of Edible Coatings On Fresh-Cut Fruits And Vegetables, Sirisha Sonti

LSU Master's Theses

Plasticized whey protein coatings have been shown to extend the shelf life of fresh produce. This thesis research was designed to determine consumer acceptance and perception of fresh-cut fruits and vegetables (FCFV) and edible coatings (EC) and to determine effects of plasticized whey protein coatings on quality of fresh-cut apples. Two studies were conducted. In the first study, a questionnaire on FCFV and EC was prepared and completed by 611 consumers. The data were analyzed using Probit analysis. In the second study, physical and microbial quality of fresh-cut (FC) apples coated with three whey proteins (30% glycerol added) each at …

Go to article

Random Centroid Optimization Of Lutein-Enriched Oil In Water Emulsion At Acidic Ph, Armen Khachatryan Jan 2003

Random Centroid Optimization Of Lutein-Enriched Oil In Water Emulsion At Acidic Ph, Armen Khachatryan

LSU Master's Theses

Age-related macular degeneration (AMD) is a physiological condition that affects the elderly, diabetic patients, and leads to loss of vision. There are no effective therapies for AMD. The role of nutrition in preventing AMD is receiving strong scientific scrutiny. Lutein and zeaxanthin have been identified as dietary strategies that can delay the onset of AMD. Consumption of at least six milligrams of lutein per day has been reported to delay the onset of AMD by as much as 43%. However, most available food sources contain such low levels of lutein that it would be difficult to meet the daily requirement. …

Go to article

Physical Function And Quality Of Life In The Very- And Oldest-Old: Gender Differences, Kellye A. Ferachi Jan 2003

Physical Function And Quality Of Life In The Very- And Oldest-Old: Gender Differences, Kellye A. Ferachi

LSU Master's Theses

Age is associated with deterioration in physical function (PF) and health-related quality of life (HRQL). Recent investigations suggest that a decrease in function may have a greater impact on perceived activities of daily living (ADL) competency in women than in men. The purpose of this investigation was to test the hypothesis that the association between PF and HRQL among older adults is influenced by gender. We examined 108 older adults aged 60 years or older, for PF (Continuous Scale-Physical Function Performance test (CS-PFP10) and Functional Status Index (FSI)) and HRQL (SF-36). In order to address this question we assigned subjects …

Go to article

Population Structure And Genetics Of Longevity In A Colony Of Dog Guides, John B. Cole Jan 2003

Population Structure And Genetics Of Longevity In A Colony Of Dog Guides, John B. Cole

LSU Doctoral Dissertations

The objectives of this study were the description of changes in genetic diversity in a colony of dog guides since its founding, and the investigation of the genetics of longevity in that population. Two breeds of dog, German Shepherds (GS) and Labrador Retrievers (LR), were evaluated. There were rapid increases in average pairwise relationship in both breeds, although the average was approximately one-third higher in the GS population than in the LR population. A similar trend was observed for average inbreeding. In the current generation, relationship and inbreeding for all animals averaged 25.3% and 26.2% in GS and 15.5% and …

Go to article

Proportional Assessment Of X And Y Chromosome-Bearing Spermatozoa In Bull And Boar Ejaculates Using Conventional And Real-Time Pcr Techniques, Julius Braden Paul Jan 2003

Proportional Assessment Of X And Y Chromosome-Bearing Spermatozoa In Bull And Boar Ejaculates Using Conventional And Real-Time Pcr Techniques, Julius Braden Paul

LSU Doctoral Dissertations

Considerable variation in the percentage of Y-chromosome bearing spermatozoa (%Y-CBS) between ejaculates in the same male has been reported. Collection regime has been speculated to influence the degree of variation in %Y-CBS in bull ejaculates (Chandler et al., 1998). Experiments were designed to evaluate the effects of two collection regimes on %Y-CBS. Conventional PCR combined with gel electrophoresis and image analysis was employed to determine %Y-CBS in ejaculates from two bulls collected on 7-day intervals and two bulls on 21-day intervals. Real-time PCR technology was used to quantify %Y-CBS in the same ejaculates. Boar ejaculates were also analyzed with both …

Go to article

The Effects Of Composition And Processing Of Milk On Foam Characteristics As Measured By Steam Frothing, Michael Levy Jan 2003

The Effects Of Composition And Processing Of Milk On Foam Characteristics As Measured By Steam Frothing, Michael Levy

LSU Master's Theses

Steam frothing of milk is required to produce an acceptable foam for many espresso coffee drinks. Specific aspects of composition and processing may affect the foaming properties of milk. The aim of this study was to determine the effect of fat content, heat treatment, free fatty acid addition and storage time on the frothing properties of milk. The four treatments included: fat content (0.08% and 3.25%), pasteurization temperatures (171°F for 15 seconds and 210°F for 45 seconds), pre and post-pasteurization addition of lauric acid solution (0.0% and 2.0% of 0.5 M concentration) and storage time (1 and 10 days). For …

Go to article

Thrips Species Composition In Louisiana Cotton And Associated Management Strategies, Donald Ray Cook Jan 2003

Thrips Species Composition In Louisiana Cotton And Associated Management Strategies, Donald Ray Cook

LSU Doctoral Dissertations

The common species of thrips infesting cotton seedlings include flower thrips, Frankliniella tritici (Fitch); tobacco thrips, Frankliniella fusca (Hinds); western flower thrips, Frankliniella occidentalis (Pergande); onion thrips, Thrips tabaci (Lindeman); and soybean thrips, Neohydatothrips variabilis (Beach). In surveys of cotton seedlings at several locations in Louisiana, tobacco thrips was the most common species. The occurrence of flower thrips and soybean thrips was variable. Western flower thrips accounted for < 15% of adults collected at all locations, except two. The performance of acephate and imidacloprid applied as seed treatments and in-furrow, and aldicarb applied in-furrow was evaluated for thrips management across different production environments. Insecticide treatments reduced thrips densities and delayed development of thrips larval populations. The at-planting insecticides influenced thrips species composition in some instances. In studies to evaluate the effects of winter-spring vegetation type (native vegetation and wheat) on aldicarb efficacy, vegetation type did not influence thrips densities on cotton, with one exception. Aldicarb reduced thrips densities regardless of vegetation type. Vegetation type or insecticide treatments did not influence lint yield. Increasing aldicarb rates generally did not improve thrips control. Aldicarb rates currently recommended in conventional tillage systems should be adequate for systems that incorporate winter-spring vegetation as cover crops. Additional studies were conducted to further investigate the influence of thrips on crop maturity and yield. The addition of an at-planting insecticide improved lint yield in one of six tests. Thrips infestations did not affect crop maturity, and with few exceptions boll distribution and boll retention. The majority of these exceptions were associated with the test where the addition of an at-planting insecticide improved lint yield. Several soil applied at-planting insecticides were evaluated against tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), in a field caged infestation study. Acephate and imidacloprid provided little control of tarnished plant bugs. Thiamethoxam and aldicarb resulted in ≥ 50% tarnished plant bug mortality until 10 and 18 DAE, respectively. These are the first reports of western flower thrips infesting cotton seedlings in Louisiana. The addition of an at-planting insecticide provided control of thrips, but affects on crop maturity and yield were variable.

Go to article

Biology And Ecology Of Leptographium Species And Their Vectos As Components Of Loblolly Pine Decline, Lori G. Eckhardt Jan 2003

Biology And Ecology Of Leptographium Species And Their Vectos As Components Of Loblolly Pine Decline, Lori G. Eckhardt

LSU Doctoral Dissertations

Loblolly pine (Pinus taeda L.) decline (LPD) has been present in upland sites of central Alabama since the 1960s. Symptoms of LPD (fine root deterioration, short chlorotic needles, sparse crowns, reduced radial growth) begin in the 30-40 yr age class, resulting in premature death at ages 35-50. Previously, declining loblolly was diagnosed as littleleaf disease (LLD); however, site conditions associated with LPD are different from LLD sites. Littleleaf disease only occurs on eroded, heavy clay soils and is secondarily associated with the fungus, Phytophthora cinnamomi. In contrast, LPD occurs on sandy, well-drained soils and is associated with Leptographium spp., as …

Go to article

Arm Crank Power And Hyperammonemia In Respones To L-Aspartic Acid Supplementation, William W. Edwards Jan 2003

Arm Crank Power And Hyperammonemia In Respones To L-Aspartic Acid Supplementation, William W. Edwards

LSU Doctoral Dissertations

PURPOSE: To examine the effect of L-Aspartic Acid (L-Asp) supplementation on short-term arm-crank power (i.e. W·min-1) and exercise-induced hyperammonemia in two gender-specific investigations. METHODS: The male investigation (MALE) used nine highly-trained intercollegiate water polo players (WP) and nine moderately-trained college students (MOD); the female investigation (FEM) used 18 recreationally-trained college students. All exercised to exhaustion on two occasions following counterbalanced double-blind ingestion of 12.5g x 2 of L-Asp or placebo (P). The warm-up phase began at 25 W·min-1 and increased in 25 W·min-1 stages every 30 seconds (constant 100 rpm). Performance began (i.e. the subjects turned …

Go to article

Using Self-Determination Theory To Understand African American Women's Physical Activity Patterns, Joan B. Landry Jan 2003

Using Self-Determination Theory To Understand African American Women's Physical Activity Patterns, Joan B. Landry

LSU Doctoral Dissertations

Physical inactivity is a major health risk factor in our society. Women and minority populations are especially at risk with regard to physical inactivity. This three-part study employed quantitative and qualitative methodologies to investigate physical activity behaviors in middle aged and older African American women. This population was chosen because African American women are the least active segment of our society. In the first phase, a quantitative approach was used to investigate relationships between Self-Determination and the Stage of Change for physical activity in a sample of 105 African American women. This study provided validation for using this theoretical approach …

Go to article

Arterial And Venous Adaptations To Short-Term Handgrip Exercise Training, Mahmoud Awad Alomari Jan 2003

Arterial And Venous Adaptations To Short-Term Handgrip Exercise Training, Mahmoud Awad Alomari

LSU Doctoral Dissertations

Four studies on vascular and exercise physiology are presented in this document. The 1st study examined the relationships between measures of fitness and FVF in 55 young [22.6 ± 3.5 years] adults. Estimated VO2peak correlated with arterial inflow (Ainf) [r=0.54; p=0.012] and resting venous outflow (Vout) [r=0.56; p=0.016]. Lastly, HG strength was associated with Vcap [r=0.57; p=0.007] and Vout [r=0.67; p=0.001]. The 2nd study examined the relationship between FVF and exercise tolerance (ExT) in 20 patients with HF [age: 59 ± 13 years] and 10 age-matched controls [age: 51 ± 16 years. The ExT was measured as the maximum …

Go to article

Protein Folding Studies Of Adipocyte Lipid Binding Protein And Homologous Mesophilic And Thermophilic Type I Dna Polymerases, Allyn J. Schoeffler Nov 2002

Protein Folding Studies Of Adipocyte Lipid Binding Protein And Homologous Mesophilic And Thermophilic Type I Dna Polymerases, Allyn J. Schoeffler

Honors Capstones

No abstract provided.

Go to article

Variations In The Xenodontid Water Snake Helicops Scalaris Jan, And The Status Of H. Hogei Lancini, Douglas A. Rossman Nov 2002

Variations In The Xenodontid Water Snake Helicops Scalaris Jan, And The Status Of H. Hogei Lancini, Douglas A. Rossman

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

Go to article

Louisiana Agriculture Fall, 2002, Lsu Agcenter Oct 2002

Louisiana Agriculture Fall, 2002, Lsu Agcenter

Louisiana Agriculture

No abstract provided.

Go to article

Louisiana Agriculture Summer, 2002, Lsu Agcenter Jul 2002

Louisiana Agriculture Summer, 2002, Lsu Agcenter

Louisiana Agriculture

No abstract provided.

Go to article

The Effects Of Egg Positioning On Broiler Breeder Eggs During Incubation On Hatchability And Chick Weight, Brian Tyler Thompson May 2002

The Effects Of Egg Positioning On Broiler Breeder Eggs During Incubation On Hatchability And Chick Weight, Brian Tyler Thompson

Honors Capstones

No abstract provided.

Go to article

The Effects Of Albumen Removal On Broiler Breeder Eggs Prior To Incubation On Hatchability And Chick Weight, Charles Sutcliffe May 2002

The Effects Of Albumen Removal On Broiler Breeder Eggs Prior To Incubation On Hatchability And Chick Weight, Charles Sutcliffe

Honors Capstones

No abstract provided.

Go to article

The Modulation And Cross-Talk Between Stat 5 And Socs-3 In Insulin And Growth Hormone Signaling In 3t3-L1 Adipocytes., David James Story May 2002

The Modulation And Cross-Talk Between Stat 5 And Socs-3 In Insulin And Growth Hormone Signaling In 3t3-L1 Adipocytes., David James Story

Honors Capstones

No abstract provided.

Go to article

The Creation Of A Knock-Out Mutation Of A Gamma And Beta Carbonic Anhydrase In Deinococcus Radiodurans And The Construction Of Expression Plasmids, Amy E. Noles May 2002

The Creation Of A Knock-Out Mutation Of A Gamma And Beta Carbonic Anhydrase In Deinococcus Radiodurans And The Construction Of Expression Plasmids, Amy E. Noles

Honors Capstones

No abstract provided.

Go to article

The Effects Of Soy Protein On Bone Mineral Density On Ovariectomized Rats, Mary C. May May 2002

The Effects Of Soy Protein On Bone Mineral Density On Ovariectomized Rats, Mary C. May

Honors Capstones

No abstract provided.

Go to article

The Physiological And Biochemical Characteristics Of Saccharomycetalean Yeasts Associated Endosymbiotically With Beetles In The Macroscopic Fruiting Bodies Of Basidiomycetes, Ebony Antoinette Spikes Apr 2002

The Physiological And Biochemical Characteristics Of Saccharomycetalean Yeasts Associated Endosymbiotically With Beetles In The Macroscopic Fruiting Bodies Of Basidiomycetes, Ebony Antoinette Spikes

Honors Capstones

No abstract provided.

Go to article

First Prev Next Last