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Articles 1 - 30 of 37
Full-Text Articles in Life Sciences
Arkansas Animal Science Department Report 2006, Zelpha B. Johnson, D. Wayne Kellogg
Arkansas Animal Science Department Report 2006, Zelpha B. Johnson, D. Wayne Kellogg
Arkansas Agricultural Experiment Station Research Series
No abstract provided.
The Changing Structure Of Arkansas' Economy: A Shift-Share Analysis, Biswaranjan Das, Daniel V. Rainey
The Changing Structure Of Arkansas' Economy: A Shift-Share Analysis, Biswaranjan Das, Daniel V. Rainey
Research Reports and Research Bulletins
The state of Arkansas enjoys the advantages of its unique central location in the nation, excellent natural surroundings, low cost of living, and one of the best business climates in the southern United States. It is home to several of the largest corporations in the world. Over the period 1980-2000, there was tremendous growth in the state’s economy. However, the growth was confined to specific regions that led to several socio-economic issues adversely affecting the state. To better understand the components and variations in economic growth, a county-wise shift-share analysis was conducted. Employment, a good indicator of economic growth, was …
Field Evaluation Of Herbicides On Rice 2005, Drew T. Ellis, Ronald E. Talbert, Marilyn R. Mcclelland
Field Evaluation Of Herbicides On Rice 2005, Drew T. Ellis, Ronald E. Talbert, Marilyn R. Mcclelland
Arkansas Agricultural Experiment Station Research Series
Field studies to evaluate herbicides in rice weed management systems were conducted in 2005 at the Rice Research and Extension Center near Stuttgart, Arkansas. New herbicides, herbicide mixtures, and application timings were evaluated for weed control efficacy and rice tolerance. Results of these studies, in part, provide useful information to producers, fellow researchers, and the crop protection industry for the most effective, economical herbicide programs for successful rice production in Arkansas.
Infiltration And Short-Term Movement Of Nitrogen In A Silt-Loam Soil Typical Of Rice Cultivation In Arkansas, Lindsay M. Copenhaver, Mary C. Savin, David M. Miller, Peter J. Tomlinson, Kristofor R. Brye, Richard J. Norman
Infiltration And Short-Term Movement Of Nitrogen In A Silt-Loam Soil Typical Of Rice Cultivation In Arkansas, Lindsay M. Copenhaver, Mary C. Savin, David M. Miller, Peter J. Tomlinson, Kristofor R. Brye, Richard J. Norman
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
Rice production in Arkansas is one of the top three crop commodities in terms of cash receipts. Researchers and farmers report that nitrogen (N) needs to be managed according to a variety of factors with two important ones being soil and fertilizer type. The objectives of this experiment were to determine: 1) the degree to which floodwater-incorporated N applied as urea or as ammonium sulfate infiltrates intact cores (7.2-cm dia., 10-cm depth) containing DeWitt siltloam soil, and 2) the distribution of N during 12 h of ponding. Inorganic-N concentrations were analyzed at 2-cm depth intervals in cores following removal of …
Status And Distribution Of The Arkansas Darter (Etheostoma Cragini) In Arkansas, Brian K. Wagner, Mark D. Kottmyer
Status And Distribution Of The Arkansas Darter (Etheostoma Cragini) In Arkansas, Brian K. Wagner, Mark D. Kottmyer
Journal of the Arkansas Academy of Science
The Arkansas darter, Etheostoma cragini, has an extremely limited distribution in Arkansas and is designated as a andidate for listing under the Endangered Species Act. It was first discovered in the state in 1979 in Wilson Spring near Fayetteville and has since been found in4 additional headwater streams in Benton and Washington counties prior to this study. A study in 1997 (bund the species in3 of the 5 historic streams, but one stream yielded only a single individual. This study sought to reassess the status of the 5 historically known populations and sample additional spring-run habitats in the Arkansas River …
Distribution Of Arkansas's Bottomland Bats, Rex E. Medlin Jr., Stephen C. Brandebura, H. Bobby Fokidis, Thomas S. Risch
Distribution Of Arkansas's Bottomland Bats, Rex E. Medlin Jr., Stephen C. Brandebura, H. Bobby Fokidis, Thomas S. Risch
Journal of the Arkansas Academy of Science
No abstract provided.
Initial Evaluation Of Novel Preparations Of Bordetella Avium By Determination Of Antibody Response Titers, Joel Gallagher, Stacy Higgins, Luc Berghman, Billy Hargis
Initial Evaluation Of Novel Preparations Of Bordetella Avium By Determination Of Antibody Response Titers, Joel Gallagher, Stacy Higgins, Luc Berghman, Billy Hargis
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
The efficacy of killed vaccines generally is not equal to live vaccines. However, due to safety and ease of production, they remain a vital part of controlling and preventing diseases. In this study, the immune response to four different vaccination preparation techniques for the agent of bordetellosis of turkeys, Bordetella avium (BA), was compared. Preparation/inactivation techniques included (1) formalin inactivation, (2) opsonization of formalin-inactivated BA, (3) buffered acetic-acid BA inactivation, or (4) opsonization of buffered acetic-acid-inactivated BA. Nonadjuvated suspensions containing equal antigen mass were administered subcutaneously (0.2 mL) at day-of-hatch in all cases. For each treatment (N=40/treatment), plasma samples were …
Effects Of Tank Mixes Of Mon 3539 And Selected Compounds In Roundupready Flex® Cotton – 2005, Jarrod Hardke, Gus Lorenz, Kyle Colwell, Craig Shelton
Effects Of Tank Mixes Of Mon 3539 And Selected Compounds In Roundupready Flex® Cotton – 2005, Jarrod Hardke, Gus Lorenz, Kyle Colwell, Craig Shelton
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
Field experiments were conducted in 2005 to evaluate potential weed control interactions when MON 3539 (glyphosate) was applied with several insecticides and a plant growth regulator to RoundupReady Flex® cotton. Applications were made at the 1-3 leaf stage, the 6-8 node stage, and at the 12-14 node stage. Different combinations of tank mixes were used in each of the three applications. In the first application, all plots received the same treatment: MON 3539 at a rate of 0.75 lb ae/a. A second application was made to evaluate crop injury. Only the MON 3539 + Dimate (dimethoate) mixture significantly increased crop …
Drying Of Post-Harvest Rough Rice With Silica Gel: A Preliminary Investigation, Stephen J. O'Brien, Terry J. Siebenmorgen
Drying Of Post-Harvest Rough Rice With Silica Gel: A Preliminary Investigation, Stephen J. O'Brien, Terry J. Siebenmorgen
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
Rice drying operations can encounter problems of over drying and losses in head rice yield (HRY) through the formation of fissures. Typical rice drying methods also utilize large volumes of expensive fossil fuels to dry the kernels. Drying of rice with a solid desiccant such as silica gel has several potential advantages that avoid some of these problems. Two cultivars of long-grain rough rice, ‘Cheniere’ and ‘Wells’ with harvest moisture contents of 17.8% and 22.0%, respectively, were dried over a 48-h period with various ratios of rough rice-to-silica gel. It was found that an intimate mixture of 3:1 rough rice …
Instructions For Authors, Discovery Editors
Instructions For Authors, Discovery Editors
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
No abstract provided.
Letter From The Dean, Gregory J. Weidemann
Letter From The Dean, Gregory J. Weidemann
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
No abstract provided.
Evaluation Of Water-Retention Ability Of Eastern Arkansas Prairie And Agricultural Soil, Maria L. Barrenechea, Kristofor R. Brye
Evaluation Of Water-Retention Ability Of Eastern Arkansas Prairie And Agricultural Soil, Maria L. Barrenechea, Kristofor R. Brye
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
Agricultural land use affects soil physical properties, such as bulk density, water content, organic matter content, and soil structure; all of which in turn affect ecosystem productivity. The objective of this study was to evaluate the effects of: 1) time since aboveground biomass has been removed by haying (i.e., 0 vs. 23 years), and 2) land use (i.e., undisturbed tallgrass prairie vs. cultivated agriculture) on water-retention characteristics in a silt-loam soil of the Grand Prairie region of eastern Arkansas. Soil samples were collected from the 0- to 10-cm depth and were wetted with varying amounts of distillated water to create …
Combined Inhibitory Effect Of Nisin With Edta Against Listeria Monocytogenes In Soy-Protein Edible Coating On Turkey Frankfurters Stored At 4°C And 10°C, Emily Bennett, T. Sivarooban, N. S. Hettiarachchy, M. G. Johnson
Combined Inhibitory Effect Of Nisin With Edta Against Listeria Monocytogenes In Soy-Protein Edible Coating On Turkey Frankfurters Stored At 4°C And 10°C, Emily Bennett, T. Sivarooban, N. S. Hettiarachchy, M. G. Johnson
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
Several food contamination outbreaks are linked to Listeria monocytogenes. More effective methods are needed to prevent the growth and recontamination of L. monocytogenes on ready-to-eat (RTE) food products. Therefore, the objectives of this study were to evaluate the inhibitory activities of nisin (10,000 IU/mL), EDTA (sodium Ethylenediaminetetraacetic acid: 1.6 mg/mL), and the combination of nisin (10,000 IU/mL) with EDTA 1.6 mg/mL either in brain-heart-infusion (BHI) media at 37°C for 72 h or in soy-protein edible coating on the surface of full-fat commercial turkey frankfurters against the cell populations of approximately 106 colony forming units (CFU/mL) of L. monocytogenes. The surface-inoculated …
Discovery: The Student Journal Of Dale Bumpers College Of Agricultural, Food And Life Sciences - Volume 7 2006, Several Authors
Discovery: The Student Journal Of Dale Bumpers College Of Agricultural, Food And Life Sciences - Volume 7 2006, Several Authors
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
No abstract provided.
Contents, Discovery Editors
Contents, Discovery Editors
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
No abstract provided.
Adventitious Shoot Propagation And Cultural Inputs In Nursery Production Of A Primocane-Fruiting Blackberry Selection, Kimberley Dennis, John R. Clark, James A. Robbins
Adventitious Shoot Propagation And Cultural Inputs In Nursery Production Of A Primocane-Fruiting Blackberry Selection, Kimberley Dennis, John R. Clark, James A. Robbins
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
Studies were conducted from January to October 2005 to determine the effect of root-cutting length on adventitious shoot yield and the management practices necessary to produce nurseryquality primocane-fruiting blackberry plants. The first portion of the study measured the average number of shoots produced from 7.6 cm- and 15.2 cm-long root cuttings of APF-44 blackberry—a primocane-fruiting genotype from the University of Arkansas breeding program. Cuttings were forced in a shallow bin containing a soilless potting medium. The average number of shoots per root cutting from 7.6 cm- and 15.2 cm- long root cuttings averaged 1.6 and 2.7 shoots per root cutting, …
Discovery Of A Dicephalic Western Diamondback Rattlesnake, Crotalus Atrox (Serpentes: Viperidae), From Texas, With A Summary Of Dicephalism Among Members Of The Genus Crotalus, Chris T. Mcallister, Van Wallach
Discovery Of A Dicephalic Western Diamondback Rattlesnake, Crotalus Atrox (Serpentes: Viperidae), From Texas, With A Summary Of Dicephalism Among Members Of The Genus Crotalus, Chris T. Mcallister, Van Wallach
Journal of the Arkansas Academy of Science
We document the fourth record of a dicephalic western diamondback rattlesnake, Crotalus atrox, collected on 17 September 2005 in Tom Green County, Texas, along with features of its external and internal anatomy, which are compared with normal C. atrox neonates. This is only the second reported case of complete anatomical duplication of the respiratory system and nearly complete duplication of the circulatory and digestive systems in dicephalic snakes. In addition, we present a summary of dicephalism among 10 species within the genus Crotalus.
Status Survey Of The Peppered Shiner, Notropis Perpallidus Hubbs And Black, In Arkansas And Oklahoma, Henry W. Robison
Status Survey Of The Peppered Shiner, Notropis Perpallidus Hubbs And Black, In Arkansas And Oklahoma, Henry W. Robison
Journal of the Arkansas Academy of Science
The peppered shiner, Notropis perpallidus Hubbs and Black, is a small, silvery, upland stream fish found only in southwestern Arkansas and eastern Oklahoma. This fish species was studied from 1999-2001 to determine its distribution, habitat, and conservation status. A total of81 collections was made during the 2-year study; however, only 17 specimens were collected. The present distribution of the peppered shiner in Arkansas and Oklahoma is described as well as the conservation status of this cyprinid in both states.
Vascular Flora Of The South Fork Native Plant Reserve, Van Buren County, Arkansas, Theo Witsell, Brent Baker
Vascular Flora Of The South Fork Native Plant Reserve, Van Buren County, Arkansas, Theo Witsell, Brent Baker
Journal of the Arkansas Academy of Science
The South Fork Native Plant Preserve, a property owned and managed by the Gates Rogers Foundation, Inc., is located along the South Fork of the Little Red River (now Greers Ferry Lake) in Van Buren County, Arkansas. We conducted a floristic inventor/ of a 61.3 ha study area consisting of the preserve, adjacent lakefront property owned by the U.S. Army Corps of Engineers, and a riparian corridor on neighboring land from February through November 2005. A total of 582 vascular plant taxa, representing 118 families and 336 genera, was documented including six species (Carex lupuliformis Sartwell ex L.H.Dewey, Carex swanii …
Hyperinfection With The Bass Tapeworm, Proteocephalus Ambloplites (Cestoda), In The Black Basses Micropterus Punctulatus And M. Dolomieui From Certain Arkansas Reservoir Lakes, James J. Daly Sr., Randal J. Keller, Bruce Deyoung
Hyperinfection With The Bass Tapeworm, Proteocephalus Ambloplites (Cestoda), In The Black Basses Micropterus Punctulatus And M. Dolomieui From Certain Arkansas Reservoir Lakes, James J. Daly Sr., Randal J. Keller, Bruce Deyoung
Journal of the Arkansas Academy of Science
No abstract provided.
New Evidence For A Maternity Colony Of The Indiana Bat (Myotis Sodalis) In The Delta Of Arkansas, Stephen C. Brandebura, Rex E. Medlin Jr., Thomas S. Risch
New Evidence For A Maternity Colony Of The Indiana Bat (Myotis Sodalis) In The Delta Of Arkansas, Stephen C. Brandebura, Rex E. Medlin Jr., Thomas S. Risch
Journal of the Arkansas Academy of Science
No abstract provided.
Organometallic Ruthenium Complexes Of Novel Thiosemicarbazones, Floyd A. Beckford, Amon T. Holt
Organometallic Ruthenium Complexes Of Novel Thiosemicarbazones, Floyd A. Beckford, Amon T. Holt
Journal of the Arkansas Academy of Science
We present the preliminary results of a study of two novel thiosemicarbazones (TSCs) and theirruthenium complexes. The TSCs were prepared by refluxing thiosemicarbazide with 9-anthraldehyde or benzanthrone in ethanol for 3 hours. The metal complex of each ligand (complex I =[(r|6 -C6H6 )Ru(9-ant-TSC )(C1)]C1 and complex II= [(r|6 -C6H6 )Ru(benz-TSC)(Cl)]Cl) was prepared by refluxing the appropriate TSC with [(r|6 -C6H6 )RuCl 2 ] r The compounds were characterized using infrared, ultraviolet-visible, and NMRspectroscopy. Two different methods, the disk diffusion test and luminometry, were used to test the compounds against a variety of different bacterial strains for antibacterial activity. The most …
Aquatic Macroinvertebrates Of The Strawberry River System In North-Central Arkansas, George L. Harp, Henry W. Robison
Aquatic Macroinvertebrates Of The Strawberry River System In North-Central Arkansas, George L. Harp, Henry W. Robison
Journal of the Arkansas Academy of Science
The Strav/berry River has been designated an Extraordinary Resource Water, an Ecologically Sensitive Water Body, and a Natural and Scenic Waterway. As such, it is particularly important that the biodiversity of this river system be documented thoroughly. The purpose of this research was to develop a comprehensive list of the aquatic macroinvertebrates of the Strawberry River and its major tributaries. The information was developed from a thorough literature review and by examining specimens housed in various collections of the Arkansas State University Museum of Zoology and collections of the authors. The latter included 9 collections at 4 sites along the …
Biomass Dynamics Of Tipula (Insecta: Diptera) In Forested Streams Of The Interior Highlands, Arkansas, Samuel B. Mccord, Alan D. Christian, Richard S. Grippo
Biomass Dynamics Of Tipula (Insecta: Diptera) In Forested Streams Of The Interior Highlands, Arkansas, Samuel B. Mccord, Alan D. Christian, Richard S. Grippo
Journal of the Arkansas Academy of Science
Abundance patterns of aquatic macroinvertebrates that utilize coarse particulate organic matter as a food source are important indicators of non--point source pollution associated with silviculture activities. This group, referred to as shredders, typically decreases in abundance as its food source—primarily leaves—is removed from the ecosystem. We tested whether larval biomass of the crane fly Tipula, a common member of the group, was an effective estimator of shredder abundance. Additionally, we used regression analysis to test whether the length to dry mass relationship of Tipula differed among geographic regions, between seasons, and between years. Results did not indicate significant differences in …
Leeches (Annelida: Hirudinida) Of Northern Arkansas, William E. Moser, Donald J. Klemm, Dennis J. Richardson, Benjamin A. Wheeler, Stanley E. Trauth, Bruce A. Daniels
Leeches (Annelida: Hirudinida) Of Northern Arkansas, William E. Moser, Donald J. Klemm, Dennis J. Richardson, Benjamin A. Wheeler, Stanley E. Trauth, Bruce A. Daniels
Journal of the Arkansas Academy of Science
Twenty-one lotic and lentic environments throughout central and northern Arkansas were surveyed for the presence of leeches during June 2004 and April, July - October 2005. Fourteen species of leeches {Helobdella elongata, Helobdella papillata, Helobdella stagnalis, Placobdella cryptobranchii, Placobdella multilineata, Placobdella ornata, Placobdella papillifera, Placobdella parasitica, Placobdella phaler a, Placobdella picta, Haemopis marmorata, Erpobdella fervida, Erpobdella microstoma, and Erpobdella punctata) representing 3 families were collected. Five species (H. elongata, P. cryptobranchii, P. multilineata, H. marmorata, and E. fervida) are reported from Arkansas for the first time. The natural history of the 22 species of leeches now known from Arkansas is …
Evaluation Of Cross Pollination Of Zephyranthes And Habranthus Species And Hybrids, Moytri Roy Chowdhury, John Hubstenberger
Evaluation Of Cross Pollination Of Zephyranthes And Habranthus Species And Hybrids, Moytri Roy Chowdhury, John Hubstenberger
Journal of the Arkansas Academy of Science
The genus Zephyranthes and the related genus Habranthus in the family Amaryllidaceae are commonly grown ornamental bulbs having new world homologies. Inter-specific and inter-generic hybridizations are complicated by the fact that some of the species are apomictic, cross incompatible, or have widely variable 2n chromosome numbers. A simple, inexpensive method of pollen storage was tested to evaluate the production of hybrid seed. Intact anthers harvested after pollen release and stored at 4°C were used for pollination. Emasculated flowers were pollinated at noon on the first or second day of anthesis. Hybrid crosses were labeled and seed collected when formed. All …
Geographic Distribution And Harvest Dynamics Of The Eastern Spotted Skunk In Arkansas, D. Blake Sasse, Matthew E. Gompper
Geographic Distribution And Harvest Dynamics Of The Eastern Spotted Skunk In Arkansas, D. Blake Sasse, Matthew E. Gompper
Journal of the Arkansas Academy of Science
The eastern spotted skunk (Spilogale putorius) is a small carnivore found across much of the central and southeastern United States, and while once common, this species has become rare in most obits range. We used harvest records collected by the Arkansas Game and Fish Commission from 1941-2004 to examine historic and current distribution and long-term harvest dynamics of this species in Arkansas. Eastern spotted skunks have historically been most common in the Ozarks and the Ouachitas though the species appears to have been present, but uncommon, in the Gulf Coastal Plain and in some counties in southeastern Arkansas near the …
Unusual Prey Item Found In An Eastern Bluebird Nest, Sarah De Viney Baxter, Richard J. Baxter, Thomas S. Risch
Unusual Prey Item Found In An Eastern Bluebird Nest, Sarah De Viney Baxter, Richard J. Baxter, Thomas S. Risch
Journal of the Arkansas Academy of Science
No abstract provided.
Ichthyofaunal Assemblages In Three Approximate But Ecologically Diverse Streams In Clark County, Arkansas, C. Renn Tumlison, Scott Jordan, Lesley Self, Henry W. Robison
Ichthyofaunal Assemblages In Three Approximate But Ecologically Diverse Streams In Clark County, Arkansas, C. Renn Tumlison, Scott Jordan, Lesley Self, Henry W. Robison
Journal of the Arkansas Academy of Science
Three tributaries to the Ouachita River in eastern Clark County, Arkansas, empty into the river within a collective distance of about 9 km. The streams drain basins derived from the Wilcox formation, partially overlain by terrace and alluvial deposits. Despite their proximity, the streams are very different: L'Eau Frais has a gravel substrate and was recognized by the French as a cool water stream, Tupelo Creek is a bottomland stream from which numerous Water Tupelo (Nyssa aquatica) emerge, and Saline Bayou was named due to its marked salinity. We studied the assemblages of fishes in these 3 very different drainages …
New Distributional Records Of Lampreys From Arkansas, Henry W. Robison, C. Renn Tumlison, James C. Petersen
New Distributional Records Of Lampreys From Arkansas, Henry W. Robison, C. Renn Tumlison, James C. Petersen
Journal of the Arkansas Academy of Science
No abstract provided.