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Articles 2011 - 2040 of 2496

Full-Text Articles in Life Sciences

Leg-Extensor Strength And Continuous-Scale Physical Functional Performance In Independent-Living Older Adults, Kathryn O'Bryan Wilson Jan 2002

Leg-Extensor Strength And Continuous-Scale Physical Functional Performance In Independent-Living Older Adults, Kathryn O'Bryan Wilson

LSU Master's Theses

A clear relationship between age-related decrements in leg strength and physical function have been reported. The purpose of this investigation was to describe the relationship between quadriceps strength tested at various velocities and the CS-PFP 10 items. Thirty-three older adults (ages 70-95 years) were assessed using the CS-PFP 10 test battery and performed quadriceps strength testing at 0, 90, 180º/sec using the Biodex dynamometer. Values for torque are reported as peak torque (PT) and relative peak torque (AdjPT) in Nm/kg body weight. The range of values for PT was (PT0: 20.2-144.3 Nm; PT90: 14-113.6 Nm; PT180: 9.6-86.4 Nm). Simple correlation …

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Management Of Imidazolinone-Tolerant (It) Rice In Drill- And Water-Seeded Rice, Kristie J. Pellerin Jan 2002

Management Of Imidazolinone-Tolerant (It) Rice In Drill- And Water-Seeded Rice, Kristie J. Pellerin

LSU Master's Theses

Field studies were conducted over two years in drill- and water-seeded rice to evaluate weed control and crop response with imazethapyr programs. Barnyardgrass [Echinochloa crus-galli (L.) Beauv.] was evaluated with imazethapyr applied alone at various rates and timings. Imazethapyr controlled barnyardgrass 95 to 97% with a soil application at 87 or 70 g/ha fb 53 or 70 g/ha EPOST or LPOST. A single EPOST application of imazethapyr at 140 g/ha controlled barnyardgrass and rice yield was equal to or above those treatments receiving two applications of imazethapyr. Research was also conducted at Crowley, LA and Rayne, LA to evaluate the …

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Development Of Diagnostic Tools For Detecting Expression Of Resistance-Associated Esterases In The Tobacco Budworm, Heliothis Virescens (F.), Huazhang Huang Jan 2002

Development Of Diagnostic Tools For Detecting Expression Of Resistance-Associated Esterases In The Tobacco Budworm, Heliothis Virescens (F.), Huazhang Huang

LSU Doctoral Dissertations

Esterase-based metabolic resistance was studied using biochemical and biological assays with organophosphate (OP)- and pyrethroid (PYR)- resistant tobacco budworms, Heliothis virescens. In biochemical assays, results suggest that: (1) esterase activities toward all substrates used were enhanced in both resistant strains compared with the susceptible strain, suggesting that esterases were involved in resistance; (2) esterase profiles differed depending on the strain and substrate used, and these differences were visualized by using native polyacrylamide gel electrophoresis; 3) esterase activities toward some pyrethroid substrates were significantly higher (P ≤ 0.01) in the PYR-R strain than those in the OP-R strain. These results suggest …

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Multidemensional Goals Of Farmers In The Beef Cattle An Dairy Industries, Aydin Basarir Jan 2002

Multidemensional Goals Of Farmers In The Beef Cattle An Dairy Industries, Aydin Basarir

LSU Doctoral Dissertations

Farm firm decision making processes have long been of concern to agricultural economists. The concept of maximizing utility rather than profit is an important concept in multidimensional goal research. The prevalence of low or negative net returns in Louisiana beef and dairy production leads to the hypothesis that goals other than profit maximization compete strongly in producers' decisions. The objective of this study is to determine the hierarchy of goals that motivate beef and dairy producers and evaluate them in a multi-dimensional framework. Seven goals were evaluated in producer decision making: Maintain and Conserve Land, Maximize Profit, Increase Farm Size, …

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Delayed Phytotoxicity Syndrome In Louisiana Rice Caused By The Use Of Thiobencarb Herbicide, Chiliang Chen Jan 2002

Delayed Phytotoxicity Syndrome In Louisiana Rice Caused By The Use Of Thiobencarb Herbicide, Chiliang Chen

LSU Doctoral Dissertations

Thiobencarb (TB), widely used for the control of broadleaf weeds, grasses, and sedges in rice fields, is considered safe for rice plants when used at recommended rates. TB's reductive dechlorination product, dechlorinated thiobencarb (DTB), is highly toxic to rice. TB is naturally transformed into DTB in field soils in certain areas in Japan and the United States. The resultant syndrome is called delayed phytotoxicity syndrome (DPS). This research was conducted to characterize DPS in Louisiana, to compare the toxicity of TB and DTB to rice, to determine uptake and retention rates of TB and DTB by rice, to confirm that …

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Evaluation Of Bacillus Thuringiensis Transgenic Field Corn For Management Of Louisiana Corn Pests, Boris A. Castro Jan 2002

Evaluation Of Bacillus Thuringiensis Transgenic Field Corn For Management Of Louisiana Corn Pests, Boris A. Castro

LSU Doctoral Dissertations

Efficacy of Bt corn hybrids expressing an insecticidal delta-endotoxin through different transformation events was evaluated in Louisiana. Efficacy levels were determined for southwestern corn borer (SWCB), Diatraea grandiosella Dyar; sugarcane borer (SCB), Diatraea saccharalis (F.); corn earworm (CEW), Helicoverpa zea (Boddie); and fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith). Insect (neonates and third instars) susceptibility was evaluated on Bt and non-Bt corn plants (V6 and R1 stages) in field plots and plant tissue in laboratory studies. Bt corn hybrids with MON810 and CBH351 transformation events sustained significantly (P < 0.05) less injury caused by SWCB, SCB, and FAW during infestations at mid-whorl stage. SWCB, SCB, and CEW infestations during silking stage were significantly reduced in Bt hybrids with the MON810 event. However, CEW infestations …

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Hypoxanthine Phosphoribosyl Transferase And Early Embryo Development, Michael Gerard Collins Ii Jan 2002

Hypoxanthine Phosphoribosyl Transferase And Early Embryo Development, Michael Gerard Collins Ii

LSU Doctoral Dissertations

The objectives of the first experiment were to ascertain if there were any differences between two mouse areola and adipose tissue cell lines. These cell lines differed only in the presence or absence of the hypoxanthine phosphoribosyl transferase (HPRT) gene. It was found that the cell lines were similar for all parameters. The objectives of the second experiment were to determine if the HPRT gene had an effect on the development of preimplantation mouse embryo. To test this transgenic mouse lines were created. The embryo sex and genotype ratio, the embryo diameter, and the embryo developmental patterns, using a Collin-Ryan …

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A Game Theoretic Analysis Of U.S. Rice Exports Under Alternative Japanese And South Korean Policy Scenarios, Dae-Seob Lee Jan 2002

A Game Theoretic Analysis Of U.S. Rice Exports Under Alternative Japanese And South Korean Policy Scenarios, Dae-Seob Lee

LSU Doctoral Dissertations

As a result of the Uruguay Round (UR), the impact on the international rice market is profound. In addition, another round of the WTO trade negotiations has started and the impacts of potential policy changes on rice trade are unknown. The major U.S. benefit of the UR has been the access to the Japanese market. However, the U.S. share of this import market has been unstable and the share of Korean rice market is zero percent. Therefore, this study attempts to analyze the potential implication of U.S. rice exports to Japan and Korea. The Japanese and Korean rice economies as …

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Effects Of Fire Frequency And The Red Imported Fire Ant On Native Insects In A Louisiana Longleaf Pine Savanna, Deanna M. Colby Jan 2002

Effects Of Fire Frequency And The Red Imported Fire Ant On Native Insects In A Louisiana Longleaf Pine Savanna, Deanna M. Colby

LSU Doctoral Dissertations

Ants and ground beetles were collected in pitfall traps from a longleaf pine savanna in the early stages of restoration. Insect abundance and species richness were compared among four treatment combinations of two fire frequencies and presence and absence of an exotic ant, Solenopsis invicta, the red imported fire ant. Amdro® was used to suppress S. invicta. Fire treatments consisted of a single fire in a two year period or two fires in a two year period, one applied each year. Fires were applied late in the growing season both years. Ten of the 28 ground beetle species …

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Production Of Transgenic Goats By Somatic Cell Nuclear Transfer, Brett C. Reggio Jan 2002

Production Of Transgenic Goats By Somatic Cell Nuclear Transfer, Brett C. Reggio

LSU Doctoral Dissertations

A series of experiments were conducted to produce transgenic goats by somatic cell nuclear transfer (NT). In all experiments, donor cells were electrically fused to enucleated metaphase II oocytes, then chemically activated. In a preliminary study to evaluate embryonic development following NT with proliferating or quiescent fibroblast or cumulus cells, significantly more embryos reconstructed with quiescent cumulus cells fused (77%) compared with proliferating cumulus cells (41%), proliferating fibroblasts (36%) or quiescent fibroblasts (37%). Improved development to the eight- to sixteen-cell stage was observed when fibroblast cells were serum starved (serum starved 39% vs. serum fed 15%). However, there was no …

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Bollworm (Lepidoptera: Noctuidae) Ecology On Genetically Engineered Bollgard And Bollgard Ii Cottons, Jeffrey Gore Jan 2002

Bollworm (Lepidoptera: Noctuidae) Ecology On Genetically Engineered Bollgard And Bollgard Ii Cottons, Jeffrey Gore

LSU Doctoral Dissertations

The ecology of bollworms, Helicoverpa zea (Boddie), on Bollgard and Bollgard II cottons, Gossypium hirsutum L., was studied in field and laboratory experiments. Neonate bollworm larvae were placed on selected components of cotton squares and flowers from non-Bollgard, Bollgard, and Bollgard II cotton varieties. Larval survival was higher on flower anthers and square anthers than on other floral parts for each cultivar. Bollworm survival was lowest on all Bollgard II floral structures. To evaluate larval behavior on Bollgard cotton, first instar bollworms were placed on terminals of non-flowering and flowering cotton plants. Larvae were recovered lower on Bollgard cotton than …

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Effects Of High-Load Eccentric Exercise Training On Rat Soleus Muscle Myofibrillar Disruption Following One-Week Of Hindlimb Suspension Unloading And Subsequent Reloading, Rhonda Dianne Prisby Jan 2002

Effects Of High-Load Eccentric Exercise Training On Rat Soleus Muscle Myofibrillar Disruption Following One-Week Of Hindlimb Suspension Unloading And Subsequent Reloading, Rhonda Dianne Prisby

LSU Doctoral Dissertations

Purpose: This investigation evaluated the effects of a high-load (50% body weight) eccentric exercise training protocol on reloading myofibrillar damage in soleus (SOL) and extensor digitorum longus (EDL) muscles in rats following 7 days (d) of hindlimb suspension unloading (HSU). Methods: 48 female Sprague-Dawley rats were randomly stratified to four experimental groups; exercise + hindlimb suspension unloading (ExHSU), hindlimb suspension unloading (HSU), exercise (Ex) and control (C). The ExHSU and Ex groups underwent a high-load eccentric exercise protocol for ~2.5 weeks. Following exercise training, the ExHSU and HSU groups underwent 7 d of hindlimb suspension unloading and a subsequent 16-19 …

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A Potential Nutraceutical From Leuconostoc Mesenteroides B-742 (Atcc 13146); Production And Properties, Chang-Ho Chung Jan 2002

A Potential Nutraceutical From Leuconostoc Mesenteroides B-742 (Atcc 13146); Production And Properties, Chang-Ho Chung

LSU Doctoral Dissertations

There is an emerging market for functional oligosaccharides for use in foods. Currently, technology for the production of oligosaccharides is limited to extraction from plant sources, acid or enzymatic hydrolysis of polysaccharides or synthesis by transglycosylation reactions. Oligosaccharides also can be produced using a Leuconostoc fermentation and restricting the polymer size by the addition of maltose. Maltose limits the dextransucrase reaction, yielding high concentrations of a-glucooligosaccharides. Branched oligomers produced by this process were found to be readily catabolized by bifidobacteria and lactobacillus but were not readily utilized by either Salmonella sp., or E. coli, pointing toward their use in intestinal …

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Intra- And Inter-Person Variability In Glycemic Responsiveness, Cassandra S. Baldwin Dec 2001

Intra- And Inter-Person Variability In Glycemic Responsiveness, Cassandra S. Baldwin

Honors Capstones

No abstract provided.

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Louisiana Agriculture Fall, 2001, Lsu Agcenter Oct 2001

Louisiana Agriculture Fall, 2001, Lsu Agcenter

Louisiana Agriculture

No abstract provided.

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Late Cretaceous Mammals And Magnetostratigraphy, Big Bend, Texas, Julia T. Sankey, Wulf Gose Aug 2001

Late Cretaceous Mammals And Magnetostratigraphy, Big Bend, Texas, Julia T. Sankey, Wulf Gose

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

No abstract provided.

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Diets Of Wild Versus Released, And Pen-Raised White-Tailed Deer In Southeastern Louisiana, Richard James Meyers Jul 2001

Diets Of Wild Versus Released, And Pen-Raised White-Tailed Deer In Southeastern Louisiana, Richard James Meyers

LSU Historical Dissertations and Theses

Twenty pen-raised white-tailed deer (Odocoileus virginianus) were released into mixed pine-hardwood forest habitat in southeastern Louisiana to compare their seasonal diets to the diets of the wild white-tailed deer population. Microhistological analysis was used to estimate the botanical composition of fecal pellet samples collected from both populations of deer over four consecutive seasons. Wild and pen-raised deer diets were found to be an average of 75.18% similar during the entire year of the study, and were significantly associated during all seasons (P < 0.001), indicating that all deer foraged on similar plant taxa in similar proportions regardless of season. Both populations of deer were found to be predominantly browsers during all seasons, with browse and fruit accounting for a yearly average of >55% of deer diets. Results from this study indicate that rehabilitated or translocated deer released into new environments …

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Preparations For Transformation Of Drosophila Melanogaster With Green Fluorescent Protein-Tagged Dmnopp140 And Dmnopp140-Rgg By P-Element Transformation, Jennifer Mccain Jul 2001

Preparations For Transformation Of Drosophila Melanogaster With Green Fluorescent Protein-Tagged Dmnopp140 And Dmnopp140-Rgg By P-Element Transformation, Jennifer Mccain

Honors Capstones

No abstract provided.

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Louisiana Agriculture Summer, 2001, Lsu Agcenter Jul 2001

Louisiana Agriculture Summer, 2001, Lsu Agcenter

Louisiana Agriculture

No abstract provided.

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Growth And Endocrine Patterns Of Cloned And Noncloned Brangus Heifers, William Buck Kyle May 2001

Growth And Endocrine Patterns Of Cloned And Noncloned Brangus Heifers, William Buck Kyle

Honors Capstones

No abstract provided.

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Attitudes And Practices About Weight, Weight Management, And The Association Of These Factors With The Development Of Chronic Disease In A Convenience Sample Of Dietetics Students, Karah Lynnette Lindbergh May 2001

Attitudes And Practices About Weight, Weight Management, And The Association Of These Factors With The Development Of Chronic Disease In A Convenience Sample Of Dietetics Students, Karah Lynnette Lindbergh

Honors Capstones

No abstract provided.

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The Characterization Of A Novel Petite Phenotype In Transgenic Arabidopsis Thaliana And The Examination Of The Expression Patterns Of A Gamma Carbonic Anhydrase Homologue In Arabidopsis Thaliana, Sumeet K. Asrani May 2001

The Characterization Of A Novel Petite Phenotype In Transgenic Arabidopsis Thaliana And The Examination Of The Expression Patterns Of A Gamma Carbonic Anhydrase Homologue In Arabidopsis Thaliana, Sumeet K. Asrani

Honors Capstones

No abstract provided.

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Hydrodynamic Properties Of Dna Polymerases, Angela Sherell Byrd May 2001

Hydrodynamic Properties Of Dna Polymerases, Angela Sherell Byrd

Honors Capstones

No abstract provided.

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The Examination Of The Expression Patterns Of A Gamma Carbonic Anhydrase Homologue In Arabidopsis Thaliana, Eric Thomas Dane Nielsen Iii Apr 2001

The Examination Of The Expression Patterns Of A Gamma Carbonic Anhydrase Homologue In Arabidopsis Thaliana, Eric Thomas Dane Nielsen Iii

Honors Capstones

No abstract provided.

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Louisiana Agriculture Spring, 2001, Lsu Agcenter Apr 2001

Louisiana Agriculture Spring, 2001, Lsu Agcenter

Louisiana Agriculture

No abstract provided.

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A Study On The Effect Of Storage Time On Specific Gravity And Eggshell Quality, Brock Kendall Laborde Jan 2001

A Study On The Effect Of Storage Time On Specific Gravity And Eggshell Quality, Brock Kendall Laborde

Honors Capstones

No abstract provided.

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Louisiana Agriculture Winter, 2001, Lsu Agcenter Jan 2001

Louisiana Agriculture Winter, 2001, Lsu Agcenter

Louisiana Agriculture

No abstract provided.

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Survival Of Canine Epididymal Sperm Under Cooled And Frozen-Thawed Conditions, Karla Stilley Jan 2001

Survival Of Canine Epididymal Sperm Under Cooled And Frozen-Thawed Conditions, Karla Stilley

LSU Master's Theses

The objective of the first experiment was to determine the effects of storage at 22„aC vs. 4„aC on the motility and percentage of membrane-intact sperm (%MIS) of epididymal mouse sperm. Testicles were allocated into 22„aC or 4„aC treatment groups and stored for 24 or 48 hours. Additional testicles were allocated into the 4„aC treatment for storage for 72 or 96 hours. Sperm was collected and analyzed at each time point. Storage at 22„aC lowered motility and %MIS (P<0.05) when compared with control sperm and 4„aC sperm at both the 24 and 48 hours. Motility and %MIS of 4„aC sperm did not decrease when compared with the control until after 72 hours of storage. The second experiment evaluated the effects of 22„aC vs. 4„aC storage for 24 and 48 hours on epididymal dog sperm. Motility and %MIS of the 22„aC sperm was lower than that of the 4„aC sperm and the control (P<0.05) at 24 and 48 hours. Motility of the 4„aC sperm was lower than the control at 24 and 48 hours (P<0.05), however %MIS was not lower than the control until 48 hours. The third experiment tested the effect of cryopreservation on epididymal dog sperm. Sperm was frozen immediately (A), after 48 hours at 4„aC in liquid (B) or after 48 hours at 4„aC of the whole testicle (C). Both pre-freeze (PF) and post-thaw (PT) motility and %MIS of B and C were lower than A (P<0.05). PT values were lower than PF values in all treatments (P<0.05). PT motility of B was lower than C (0 vs. 35.0¡Ó3.6%). Storage at 4„aC allows collection of motile epididymal mouse and dog sperm for several days after death. Dog testicles can be refrigerated for 2 days and epididymal sperm frozen with PT motility and %MIS of 35 and 62%.

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Trade Flows And Marketing Practices Of Louisiana And Gulf States Nurseries, Wade R. Hampton Jan 2001

Trade Flows And Marketing Practices Of Louisiana And Gulf States Nurseries, Wade R. Hampton

LSU Master's Theses

The markets facing nursery producers have changed dramatically in the past decade. These changes in nursery markets have outdated previous research. New research into nursery marketing will assist nursery producers in making marketing decisions. Nursery producers can market their plants to five different marketing channels: Mass-merchandisers, garden centers, other retailers, landscapers and re-wholesalers. This study described the 1998 Louisiana nursery industry, analyzed nursery market changes over the past decade in Louisiana and the Southeast and analyzed characteristics of Louisiana and Southeastern nurseries to estimate marketing channel choice. Data was collected via mail using the third Trade Flows and Marketing Practices …

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The Time-Course Of Vascular Adaptations Following Localized Short Term Exercise Training, Jason David Allen Jan 2001

The Time-Course Of Vascular Adaptations Following Localized Short Term Exercise Training, Jason David Allen

LSU Doctoral Dissertations

This is a series of 3 experiments in the area of vasoreactivity. The first study investigated the stability and reproducibility of brachial artery flow-mediated dilation (BAFMD). Twenty-six healthy volunteers underwent 3 scans on 2 days, performed by 2 ultrasonographers, and analyzed by 2 readers. All subjects were tested between 7 and 11am after refraining from food and exercise. Average baseline diameter was 3.48±0.53mm, which increased to 3.71±0.57mm (6.58±4.15%) at peak dilation. ICCC's for days, testers and readers were 0.9188, 0.9394, and 0.8982 respectively. To detect a difference in vasoreactivity of 60% (two-tailed), e.g. 5% vasodilation versus 8% vasodilation, at 90% …

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