Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 15 of 15
Full-Text Articles in Entire DC Network
Genotype By Environment Interaction For Ear Moisture Loss Rate In Corn., Robert T. Magari
Genotype By Environment Interaction For Ear Moisture Loss Rate In Corn., Robert T. Magari
LSU Historical Dissertations and Theses
Corn (Zea mays L.) hybrids with rapid ear moisture loss rate (EMLR) are needed to reduce post-harvest production costs relative to artificial grain drying. Previous investigations indicated that genetic variation for grain dry-down rate existed; however, genotype by environment interaction (GEI) for this trait has not been specifically investigated. The objectives of this study were: (1) to evaluate EMLR and stability of selected commercial corn hybrids in different environments, (2) to determine approximate optimum numbers of plants per plot, replications, and environments for evaluating EMLR, and (3) to assess the contribution of known environmental factors to GEI for EMLR. Experiments …
Etiology And Biological Control Of Seedling Disease In Water-Seeded Rice., Se-Chul Chun
Etiology And Biological Control Of Seedling Disease In Water-Seeded Rice., Se-Chul Chun
LSU Historical Dissertations and Theses
In order to assess the potential of biological control of rice seedling disease, detailed etiological information was required, i.e. when and for how long are seedlings susceptible and which portions of the seed and seedling are susceptible. Contaminant-free seeds were required for these studies. For this purpose, rice seeds were soaked for 2 hrs in freshly prepared 2.6% sodium hypochlorite adjusted to pH 7.0 with a final concentration of 0.5 M potassium phosphate. This treatment was not only very effective in disinfesting seeds but also seemed to promote seedling growth. On the basis of this observation, a study was conducted …
Production Of Transgenic Channel Catfish., Mark Christian Bates
Production Of Transgenic Channel Catfish., Mark Christian Bates
LSU Historical Dissertations and Theses
The channel catfish industry has experienced tremendous growth over the last several years. This growth has triggered more intensive culture practices resulting in disease outbreaks and devastating mortalities. Medicated feeds and vaccination have been of limited use. This research presents studies on techniques to produce disease resistant channel catfish by gene transfer. The gene used was the cecropin B gene from the giant silkworm moth Hyalophora cecropia, controlled by an acute phase response (APR) promoter also from H. cecropia. The objectives of this study were to: (1) determine if an early maturing population of catfish from Lake Maurepas, Louisiana, could …
Vegetation, Soils, And Hydrology Of Central Louisiana Bottomland Hardwood Forest Types., William Brown Patterson
Vegetation, Soils, And Hydrology Of Central Louisiana Bottomland Hardwood Forest Types., William Brown Patterson
LSU Historical Dissertations and Theses
Wetland delineation in bottomland hardwood forests is controversial due to uncertainty of the duration of inundation and soil saturation on seasonally dry sites. Wetland delineation requires an assessment of hydrophytic vegetation, hydric soils, and wetland hydrology. The objectives were to: (i) classify forest types in five Wildlife Management Areas in central Louisiana within Sharkey clay and Fausse clay soil mapping units, (ii) compare site and soil variables between the forest types, (iii) evaluate relationships between tree species distributions and soil/site factors, (iv) characterize soils in the study area, (v) evaluate differences in forest types for durations of inundation, soil saturation, …
The Production Of Glucooligosaccharides By Leuconostoc Mesenteroides Atcc 13146 And Lipomyces Starkeyi Atcc 74054., Sun Kyun Yoo
The Production Of Glucooligosaccharides By Leuconostoc Mesenteroides Atcc 13146 And Lipomyces Starkeyi Atcc 74054., Sun Kyun Yoo
LSU Historical Dissertations and Theses
Glucooligosaccharides of less than DP 10 were produced either by mixed cultures of Leuconostoc mesenteroides ATCC 13146 and L. starkeyi ATCC 74054, or by an acceptor reaction produced by Leuconostoc mesenteroides ATCC 13146. The yields of glucooligosaccharides produced by mixed culture and acceptor reaction reached up to 49 and 90% of theoretical yield. The composition of carbohydrates at the end of fermentation by mixed culture was 31.4% oligosaccharides, 17.6% dextran, 31.4% mannitol, 2.1% fructose, and 2.4% of sucrose. The composition of carbohydrates at the end of fermentation by acceptor reaction was 32.7% pannose, 30.4% branched isomaltotetraose (DP 4), 21.7% branched …
Amino Acid Requirements And Crystalline Amino Acids For Finishing Pigs., Theresia Alice Knowles
Amino Acid Requirements And Crystalline Amino Acids For Finishing Pigs., Theresia Alice Knowles
LSU Historical Dissertations and Theses
This research was conducted to obtain a better understanding of the amino acid needs of finishing pigs. Twelve experiments were conducted using the urea nitrogen method to determine the lysine requirement of gilts and barrows. Two experiments were conducted to determine the optimum ratio of total sulfur amino acids to lysine for finishing pigs (74 to 111 kg); and three experiments were conducted to evaluate the net energy content of low crude protein, crystalline amino acid supplemented diets for finishing pigs (70 to 117 kg). The lysine requirement of gilts, as determined by the urea nitrogen method, decreased as body …
A Case-Ready Modified-Atmosphere Packaging System For Beef., Brian Scott Smith
A Case-Ready Modified-Atmosphere Packaging System For Beef., Brian Scott Smith
LSU Historical Dissertations and Theses
Beef tenderness and color stability were evaluated in conventional and modified atmosphere packaging (MAP) systems. Equal portions of inside rounds removed immediately (PM0) or at 48 h postmortem (PM48) were vacuum packaged (VP) whole or cut into steaks and packaged in 80%N$\sb2$:20%CO$\sb2$ MAP. On day 12, MAP environments were exchanged for 80%O$\sb2$:20%CO$\sb2$. Calpastatin activity was lower at 2 d postmortem for PM48 steaks than PM0 steaks. Electrophoresis indicated more degradation of 50 and $>$250 kDA compounds at 2 d postmortem for PM48 than PM0 steaks. Steaks from PM48 required less shear force than PM0 steaks. HunterLab 'L', 'a' and …
Interactive Effects Of Weeds And Defoliating Insects In Soybean (Glycine Max)., Charles Frost Grymes
Interactive Effects Of Weeds And Defoliating Insects In Soybean (Glycine Max)., Charles Frost Grymes
LSU Historical Dissertations and Theses
Field experiments were conducted to evaluate the influence of simulated insect defoliation and full season weed competition on soybean (Glycine max (L.) Merr.) growth and yield. Weeds were johnsongrass (Sorghum halepense (L.) Pers.), common cocklebur (Xanthium strumarium L.), and hemp sesbania (Sesbania exaltata (Raf.) Rybd. ex A. W. Hill) at 15, 3, and 12 plants/6 m of row. Simulated defoliation at R2 and R5 soybean growth stages was accomplished by removal of 0, 1, or 2 leaflets per soybean trifoliate, which approximated 0, 33, and 66% defoliation, respectively. Averaged across defoliation levels and stages, johnsongrass, common cocklebur, and hemp sesbania …
Reduction And Management Of Risks Associated With Aflatoxin And Fumonisin Contamination In Corn., Socrates Trujillo
Reduction And Management Of Risks Associated With Aflatoxin And Fumonisin Contamination In Corn., Socrates Trujillo
LSU Historical Dissertations and Theses
Aflatoxins and fumonisins, secondary mold metabolites, occur naturally as co-contaminants in corn. Health and economic risks associated with this contamination of food and feed have been the focus of much research worldwide. Research programs resulting from the discovery of aflatoxins in the 1960's has been used to guide study programs for fumonisins. The establishment of food safety programs, including mycotoxin decontamination procedures, must be evaluated for further application. The evaluation of selected procedures which reduce the risks associated with the contamination of these mycotoxins in food utilized for human and animal consumption was the focus of this study. This study …
Potential For Glufosinate As A Selective Herbicide For Red Rice Control In Bar-Transformed Rice., Sujatha Sankula
Potential For Glufosinate As A Selective Herbicide For Red Rice Control In Bar-Transformed Rice., Sujatha Sankula
LSU Historical Dissertations and Theses
A three year study was conducted to evaluate the herbicide glufosinate on BAR-transformed rice and on the weed red rice. Preliminary evaluations with 1.1 and 2.2 kg/ha glufosinate on the BAR-transformed Gulfmont and Koshihikari rice varieties showed that both were resistant, but there was more injury to Koshihikari. Glufosinate at 2.2 kg ai/ha injured BAR-transformed Gulfmont rice more when applied to the 1- to 2-leaf stage (23-26%) than when applied to 3- to 4-leaf (13-19%) plants. The damage was least with boot stage applications (3-14%). Phytotoxicity to BAR-transformed Gulfmont rice was greater when 2.2 kg/ha glufosinate was combined with 0.4 …
Evaluation Of Water-Seeded No-Till Rice Culture With Respect To Weeds And Seedling Disease., Roland Detleo Mendt
Evaluation Of Water-Seeded No-Till Rice Culture With Respect To Weeds And Seedling Disease., Roland Detleo Mendt
LSU Historical Dissertations and Theses
Field studies were conducted over three years to evaluate preplant postemergence herbicides for red rice control in rice under no-till water-seeded culture. Application of paraquat or sulfosate plus thiobencarb and paraquat alone 3 days before seeding (DBS) resulted in the greatest red rice control 11 weeks after seeding (WAS). Rice yield was increased and percent red rice in rice grain decreased when paraquat or sulfosate was applied in combination with thiobencarb compared with the nontreated control. Rice yield was increased when herbicides were applied 3 and 7 DBS as compared with 14 and 28 DBS. Aqueous extracts of cursed buttercup, …
The Recycling Potential Of Out-Of-Service Utility Poles For Engineered Wood Products., Han Roliadi
The Recycling Potential Of Out-Of-Service Utility Poles For Engineered Wood Products., Han Roliadi
LSU Historical Dissertations and Theses
This study on the recycling potential of out-of-service poles for use in engineered wood products involved determination of basic properties of used southern pine (Pinus sp.) utility poles and also manufacture of glued-laminated beams from these poles. Most of the defect-free portions of 25-year treated poles still retained adequate strengths comparable to those of freshly treated poles and untreated southern pine. Creosote contents, however, diminished with pole ages. The reduction in creosote content was correlated with lower decay resistance, poorer dimensional stability, and lower lumber recovery, but better gluability. The spectrometry method for creosote content determination was explored as an …
The Effects Of Homogenized Cream And Commercial Buttermilk Powder On Low-Fat Cheddar Cheese., Tonya Conner Schoenfuss
The Effects Of Homogenized Cream And Commercial Buttermilk Powder On Low-Fat Cheddar Cheese., Tonya Conner Schoenfuss
LSU Historical Dissertations and Theses
Seventy percent reduced fat Cheddar cheese was manufactured with homogenized cream and sweet cream buttermilk powder in an effort to improve flavor and texture characteristics. Manufacturing procedures, as well as the chemical, physical and sensory attributes. Pasteurized cream was homogenized (15.8 MPa) with and without the addition of buttermilk powder. The cream was added to pasteurized skim milk to produce two vats of cheese, one with and one without buttermilk powder. After milling, each vat was split to produce a washed curd and normal curd cheese. The four cheeses were sampled at week one, and months one, two and four. …
Evaluation Of Sampling Gear For Predicting Harvest Size, Yield And Incidence Of Stunting In Crawfish Ponds., Jimmy Lee Avery
Evaluation Of Sampling Gear For Predicting Harvest Size, Yield And Incidence Of Stunting In Crawfish Ponds., Jimmy Lee Avery
LSU Historical Dissertations and Theses
Dip-nets, test traps and experimental drop samplers were evaluated for their potential to predict crawfish (Procambarus spp.) yields and size distribution at harvest. Field studies were conducted at the Rice Research Station, LSU Agricultural Center, Crowley, Louisiana, between 1991 and 1996 in 82 (0.16-0.2 ha) earthen impoundments. Fields were managed to simulate rice-crawfish systems typical of the southwestern and south-central Louisiana. Multiple linear regression analysis was used to determine the relationship among catch-per-unit-effort (CPUE) of sampling gear (alone and in combination) with respect to yield in weight (kg/ha), yield in number (crawfish/ha) and size distribution at harvest. Relative abundance of …
Intrarow Plant Spacing And Family By Environment Interaction Effects On Sugarcane Cross Evaluation., Orlando De Sousa Vieira
Intrarow Plant Spacing And Family By Environment Interaction Effects On Sugarcane Cross Evaluation., Orlando De Sousa Vieira
LSU Historical Dissertations and Theses
Progeny testing is practiced to select the best crosses (families) prior to individual plant selection and to guide decisions relative to hybridizing and seedling planting in many crops including sugarcane (Saccharum sp. hyb.). Research to optimize the progeny testing methodology examined its effectiveness relative to family, within family, environment, replication, and intrarow plant spacing. Variance-component analysis indicated that family by environment (locations, years) interaction was a minor inhibitor of selection effectiveness. Within-family variance was the largest source of variation for the five traits considered. For stalk weight, stalk length, and stalk diameter, a small majority of this variance was due …