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Articles 1 - 28 of 28
Full-Text Articles in Life Sciences
Field Evaluation Of Herbicides On Small Fruit, Vegetable, And Ornamental Crops, 1996, Ron Talbert, Lance A. Schmidt, Nilda R. Burgos, Jennifer A. Johnson, Joe K. Curless, Jason K. Norsworthy
Field Evaluation Of Herbicides On Small Fruit, Vegetable, And Ornamental Crops, 1996, Ron Talbert, Lance A. Schmidt, Nilda R. Burgos, Jennifer A. Johnson, Joe K. Curless, Jason K. Norsworthy
Arkansas Agricultural Experiment Station Research Series
No abstract provided.
Herbicide Evaluation In Arkansas Rice, 1996, Eric Webster, Ron Talbert, Ford Baldwin, David Gealy, Tomilea Dillon, Jason Norsworthy, Lance Schmidt, Dwayne Beaty
Herbicide Evaluation In Arkansas Rice, 1996, Eric Webster, Ron Talbert, Ford Baldwin, David Gealy, Tomilea Dillon, Jason Norsworthy, Lance Schmidt, Dwayne Beaty
Arkansas Agricultural Experiment Station Research Series
No abstract provided.
The Mercosur Rice Economy, Ralph Bierlen, Eric J. Wailes, Gail L. Cramer
The Mercosur Rice Economy, Ralph Bierlen, Eric J. Wailes, Gail L. Cramer
Research Reports and Research Bulletins
There has been growing interest among nations in the western hemisphere in preferential trading arrangements (Taylor et al., 1995; Schuh and Junguita, 1993). Since 1990, 33 regional agreements have been registered with the World Trade Organization — the supranational organization that sets the rules for international trade (Blandford, 1995). One of the most important of these trading arrangements is the Mercado Comun del Sur (Common Market of the South), commonly referred to by its acronym, the MERCOSUR. (See Table 1 for a definition of acronyms and technical terms.) The MERCOSUR is a customs union whose member nations are Argentina, Brazil, …
B.R. Wells Rice Research Studies 1996, R. J. Norman, T. H. Johnston
B.R. Wells Rice Research Studies 1996, R. J. Norman, T. H. Johnston
Arkansas Agricultural Experiment Station Research Series
No abstract provided.
Arkansas Soil Fertility Studies 1996, Wayne E. Sabbe
Arkansas Soil Fertility Studies 1996, Wayne E. Sabbe
Arkansas Agricultural Experiment Station Research Series
No abstract provided.
Yield, Earliness And Fiber Strength Of Blends Of Cotton (Gossypium Hirsutum L.) Cultivars, J. S. Mcconnell, F. M. Bourland, W. H. Baker, B. S. Frizzell
Yield, Earliness And Fiber Strength Of Blends Of Cotton (Gossypium Hirsutum L.) Cultivars, J. S. Mcconnell, F. M. Bourland, W. H. Baker, B. S. Frizzell
Research Reports and Research Bulletins
Pricing of cotton (Gossypium hirsutum L.) has been determined primarily by fiber length and grade, which were manually determined. Implementation of the high volume instrument (HVI) cotton classing system in 1991 allowed other fiber quality parameters to be objectively and rapidly measured (Deussen, 1989). One quality parameter added to the pricing structure by the advent of HVI in determining the value of ginned lint is fiber strength (Table 1). Open-end spinning, a new technology being utilized by the textile industry, requires high-strength cotton fibers (>25 g/tex) for manufacture of yarns. As this technology becomes more widely used, cotton with …
Fish Community Of Indian Bayou, A Coastal Plain Stream Of Remarkable Species Richness In The Lower White River Drainage Of Arkansas, Thomas M. Buchanan
Fish Community Of Indian Bayou, A Coastal Plain Stream Of Remarkable Species Richness In The Lower White River Drainage Of Arkansas, Thomas M. Buchanan
Journal of the Arkansas Academy of Science
It is increasingly important to identify unique aquatic ecosystems in the coastal plain lowlands of Arkansas, because of the extensive human-induced alteration of aquatic habitats and loss of fish diversity in that region. Indian Bayou, part of a small (103 km2 ), chute-fed drainage system off the lower White River in Monroe County, Arkansas, has a fish community that is unique among Delta streams in darter (Percidae) species richness. Twenty-five fish samples collected by seine and rotenone from the Indian Bayou drainage system over an 18-year period produced 62 fish species, including 13 darter species. The fish community at one …
Method To Correct The Voxel Size In Press Localized Nmr Stereoscopy, Diana M. Lindquist, Roger M. Hawk, Richard A. Komoroski
Method To Correct The Voxel Size In Press Localized Nmr Stereoscopy, Diana M. Lindquist, Roger M. Hawk, Richard A. Komoroski
Journal of the Arkansas Academy of Science
Two techniques commonly used on human magnetic resonance spectroscopy systems to obtain spectra from localized volumes in the brain are point resolved spectroscopy (PRESS) and stimulated echo acquisition mode (STEAM) spectroscopy. PRESS gives a signal twice as large as that obtained with STEAM, but suffers from longer minimum echo times. While STEAM must be used to detect species with short spin-spin relaxation times, PRESS can be used for species with longer relaxation times to give a spectrum with a better signal to noise ratio. Only STEAM was provided for the GE Omega 4.7 T small animal imager used in this …
Distribution And Status Of The Ozark Shiner, Notropos Ozarcanus Meek, In Arkansas, Henry W. Robison
Distribution And Status Of The Ozark Shiner, Notropos Ozarcanus Meek, In Arkansas, Henry W. Robison
Journal of the Arkansas Academy of Science
The Ozark shiner, Notropis ozarcanus, an endemic species of the Ozark Highlands, was studied from 1994-1995 to determine its present distribution and conservation status in Arkansas. One-hundred and four collections of fishes were made from throughout the historic range of the Ozark shiner. A total of 91 Ozark shiners was collected during the two-year study. The present state distribution is described as well as the conservation status of the Ozark shiner in Arkansas. The largest populations seem to be present in the protected Buffalo River.
Methodology For Integrating Aerial Photography And Landsat Tm Imagery For Inventory Of Forest Land Cover, Chris W. Bennett, Robert C. Weih Jr.
Methodology For Integrating Aerial Photography And Landsat Tm Imagery For Inventory Of Forest Land Cover, Chris W. Bennett, Robert C. Weih Jr.
Journal of the Arkansas Academy of Science
Forest cover for 7.25 million acres (2.93 million hectares) in southeastern Georgia was characterized for the years 1988 and 1994 with the intent of assessing the efficacy of remote sensing procedures for broad scale forest inventory. Landsat-5 Thematic Mapper digital satellite scenes of seven spectral bands were obtained for winter and summer of each year and were analyzed two separate 14-band multi-temporal images. Images were geo-referenced to the universal transverse mercator (UTM) coordinate system prior to classification. Spectral classification with the 1SOCLUSTER algorithm produced 250 categories. Color infrared aerial photographs were mapped to the digital imagery and were used to …
Effects Of Retained Pine And Hardwood Basal Areas On Percent Cover Of Plants Utilized By Bobwhite Quail, David G. Peitz, Philip A. Tappe, Michael G. Shelton
Effects Of Retained Pine And Hardwood Basal Areas On Percent Cover Of Plants Utilized By Bobwhite Quail, David G. Peitz, Philip A. Tappe, Michael G. Shelton
Journal of the Arkansas Academy of Science
Percent cover of seven forage species utilized by bobwhite quail (Colinus virginianus) was determined before thinning and 2 and 4 years after thinning a 35-year-old loblolly pine-hardwood stand. Combinations of three loblolly pine (15, 18, and 21 m2/ha) and three hardwood (0, 3.5, and 7 m2/ha) basal areas were replicated three times. Percent cover was determined for American beautyberry (Callicarpa americana), blackberry (Rubus spp.), tick trefoil (Desmodium spp.), lespedeza (Lespedeza spp.), panic grass (Panicum spp.), yellow wood sorrel (Oxalis stricta), and three-seeded mercury (Acalypha spp.). Percent cover of American beautyberry and blackberry increased with time. Tick trefoil and panic grass …
Revised Status Of Rare And Endangered Unionaea (Mollusca: Margaritiferidae, Unionidae) In Arkansas, John L. Harris, Peter J. Rust, Alan D. Christian, William R. Posey Ii, Chris L. Davidson, George L. Harp
Revised Status Of Rare And Endangered Unionaea (Mollusca: Margaritiferidae, Unionidae) In Arkansas, John L. Harris, Peter J. Rust, Alan D. Christian, William R. Posey Ii, Chris L. Davidson, George L. Harp
Journal of the Arkansas Academy of Science
Harris and Gordon (1987) reviewed the distribution and status of 18 rare and /or endangered unionacean bivalve species (commonly referred to as clams, mussels, freshwater mussels, naiads) that occur or have occurred in Arkansas. They discussed four species that were federally listed as endangered, four species that were considered endangered or extirpated within Arkansas, four species considered threatened within Arkansas, four species of special concern within Arkansas, and two species for which the conservation status was considered uncertain due to questions regarding taxonomic validity. Numerous unionacean field surveys have been performed during 1986 1996, and a substantial database of new …
Assessing The Cost Of Best Management Practices In Arkansas, Richard A. Kluender, Robert C. Weih Jr., M. Corrigan, J. Pickett
Assessing The Cost Of Best Management Practices In Arkansas, Richard A. Kluender, Robert C. Weih Jr., M. Corrigan, J. Pickett
Journal of the Arkansas Academy of Science
A geographic information system (GIS) is a set of powerful, computer-based, analytical algorithms for solving spatial data problems. Recently, due to increases in memory size, computing speed, and programming advances, personal computers have been used in spatial analysis problems. This study reports the benefits of using a PC-based GIS system to solve a common, but complicated problem in forest management: assignment of harvesting areas with harvesting exclusion zones. Two stands each from the USDA Crossett Experimental Forest, the University of Arkansas Forest, and the Ouachita National Forest (total six) were analyzed to determine the changes due to following best management …
Age, Growth And Condition Of Largemouth Bass, Micropterus Salmoides, Of Lake Ashbaugh, Arkansas, Ronald L. Johnson, Rosalyne M. Davis
Age, Growth And Condition Of Largemouth Bass, Micropterus Salmoides, Of Lake Ashbaugh, Arkansas, Ronald L. Johnson, Rosalyne M. Davis
Journal of the Arkansas Academy of Science
The population size structure, length at age and condition of 140 largemouth bass, Micropterus salmoides, were studied for Lake Ashbaugh, Arkansas. Scales and otoliths were used for age and length at age determination of individual bass. Length at age was determined by back-calculation and relative weight was used to measure condition. The Lake Ashbaugh population is dominated by young, slow growing bass in poor condition. Ninety-one percent of the largemouth bass in Lake Ashbaugh were less than four years of age, with age 3+ bass serving as the dominant year class. Proportional and relative stock density values were 25 and …
Prediction Of Potential Antimigraine Activity Using Artificial Neural Networks, Qing Luo, Jerry A. Darsey, Cesar M. Compadre, Sanjay K. Mitra
Prediction Of Potential Antimigraine Activity Using Artificial Neural Networks, Qing Luo, Jerry A. Darsey, Cesar M. Compadre, Sanjay K. Mitra
Journal of the Arkansas Academy of Science
More than 10 million Americans, three quarters of them women, suffer some degree of recurrent migraine headaches. Feverfew [Tanacetum parthenium (L.) Schultz-Bip.) is a member of the Asteraceae family that is native to Europe. This plant is a perennial flowering aromatic plant common in gardens. It has been widely used as a self-medication of arthritis, fever, and migraine headaches for over 2000 years. Sesquiterpene lactones (SL) are the components responsible for the antimigraine activity of feverfew. In this research, the relationship between SL structural information and their biological activity was studied by using Gaussian 92 program in conjunction with artificial …
New Records For The Distribution Of An Unusual Liverwort, Petalophyllum Ralfsii (Fossombroniaceae), Daniel L. Marsh, Timothy A. Golden, David L. Mcdaniel, Gregory A. Nunley, Winfred D. Crank
New Records For The Distribution Of An Unusual Liverwort, Petalophyllum Ralfsii (Fossombroniaceae), Daniel L. Marsh, Timothy A. Golden, David L. Mcdaniel, Gregory A. Nunley, Winfred D. Crank
Journal of the Arkansas Academy of Science
No abstract provided.
Swimming Behavior In The Fox Squirrel, Sciurus Niger (Rodentia: Sciuridae), From Northeastern Arkansas, Stanley E. Trauth, David H. Jamieson
Swimming Behavior In The Fox Squirrel, Sciurus Niger (Rodentia: Sciuridae), From Northeastern Arkansas, Stanley E. Trauth, David H. Jamieson
Journal of the Arkansas Academy of Science
No abstract provided.
Effect Of Media Constituents On In Vitro Culturing Of Cowpea (Vigna Unguiculata) Shoot Tip And Leaf Disk Explants, Mohanjeet S. Brar, Edwin J. Anderson, Teddy E. Morelock, Ronald W. Mcnew
Effect Of Media Constituents On In Vitro Culturing Of Cowpea (Vigna Unguiculata) Shoot Tip And Leaf Disk Explants, Mohanjeet S. Brar, Edwin J. Anderson, Teddy E. Morelock, Ronald W. Mcnew
Journal of the Arkansas Academy of Science
Cowpea is an important legume food crop that is commonly grown in Arkansas and numerous other southern states. The application of biotechnological approaches for the improvement of U.S. cowpea genotypes is currently not possible due to the lack of a regeneration and transformation system. Therefore, the first priority of our research efforts is the development of a plant regeneration system that will facilitate plant transformation studies. In an effort to optimize the media requirements for tissue culturing cowpea, we evaluated the in vitro response of shoot tip and leaf disk explants to various levels of Murashige and Skoog (MS) macro …
Comparison Of Waterbird Utilization Of Two Northwest Arkansas Reservoirs, Jefferey T. Briggler, Robert C. Dobbs
Comparison Of Waterbird Utilization Of Two Northwest Arkansas Reservoirs, Jefferey T. Briggler, Robert C. Dobbs
Journal of the Arkansas Academy of Science
Waterbird use of two moderately-sized reservoirs in northwest Arkansas was studied in the autumns of 1993 and 1995. In addition to waterbird counts; surface area, water temperature, conductivity, pH, turbidity, dissolved oxygen, macrophyte presences, number of total macroin vertebrates and degree of human activity were evaluated. Lake Fayetteville supported a greater overall waterbird species richness and species abundance than Lake Wedington. The observed number of ducks per hectare showed a significant difference between the lakes in both 1993 and 1995. Surface feeding birds were significantly more abundant at Lake Fayetteville in both 1993 and 1995, whereas diving birds, which feed …
Variability In Forest Floor Mass And Nutrient Concentration Of Mature Pine-Hardwoods In The Ouachita Mountains, Hal O. Liechty, Michael G. Shelton, Edwin R. Lawson
Variability In Forest Floor Mass And Nutrient Concentration Of Mature Pine-Hardwoods In The Ouachita Mountains, Hal O. Liechty, Michael G. Shelton, Edwin R. Lawson
Journal of the Arkansas Academy of Science
Prior to timber harvesting, forest floor mass and nutrient concentrations in forest floor and mineral soil were determined in 24 mature, shortleaf pine (Pinus echinata Mill.)-hardwood stands occurring within the northern, eastern, southern and western sub-ecoregions of the Ouachita Mountains. The forest floor samples were collected at each of three locations representing the lower, mid, and upper slope positions within each stand. Samples of the L-(litter) and F-layers (fermentation) were collected separately. Materials from the L-layer were differentiated into hardwood foliage, pine foliage, and woody/reproductive components. Mass and nutrient concentrations of the various forest floor components were compared among slope …
Skeletochronological Study Of Adult Spiny Softshell Turtles (Apalone Spinifera) From Northeastern Arkansas, Stanley E. Trauth, Hilary J. Worley
Skeletochronological Study Of Adult Spiny Softshell Turtles (Apalone Spinifera) From Northeastern Arkansas, Stanley E. Trauth, Hilary J. Worley
Journal of the Arkansas Academy of Science
Skeletochronological techniques were used to examine age and growth in adult spiny softshell turtles {Apalone spiniferd) from northeastern Arkansas. The diaphyseal region offemurs of 24 specimens (8 mars mars; 16 venus venus) was excised, decalcified in weak hydrochloric acid, and histologically prepared for light microscopy. Skeletal growth was determined from histosectioned bones by measuring femur diameters as well as by counting lines of arrested growth (LAGs) that appear between distinct periosteal layers (marks of skeletal growth =MSGs) laid down during a single growing season. Although significant positive correlations were found between carapace length (CL) and femur diameter in both males …
Survey Of Mollusca (Bivalva: Unionacea) Inhabiting Myatt Creek, Fulton County, Arkansas, Chris L. Davidson, George L. Harp, John L. Harris
Survey Of Mollusca (Bivalva: Unionacea) Inhabiting Myatt Creek, Fulton County, Arkansas, Chris L. Davidson, George L. Harp, John L. Harris
Journal of the Arkansas Academy of Science
No abstract provided.
First Records For The Blackmask Racer (Coluber Constrictor Latrunculus) In Eastern Arkansas, Stanley E. Trauth
First Records For The Blackmask Racer (Coluber Constrictor Latrunculus) In Eastern Arkansas, Stanley E. Trauth
Journal of the Arkansas Academy of Science
The presence of the blackmask racer (Coluber constrictor latrunculus) in eastern Arkansas was first demonstrated by examination of a series of color slides of live specimens now preserved and deposited in the Arkansas State University Museum of herpetology. Adult color pattern is of paramount importance in the definition of subspecies of C. constrictor, and this is especially true for C. c. latrunculus. This subspecies is characterized by a conspicuous black stripe that extends from the postnasal, through the eye and onto the temporals or anterior dorsal scales. The dorsum is slate gray, and the venter is a pale grayish blue. …
Floristic Survey And Annotated Checklist Of The Pine Bluff Arsenal, Stephen A. Walker, Julian Campbell
Floristic Survey And Annotated Checklist Of The Pine Bluff Arsenal, Stephen A. Walker, Julian Campbell
Journal of the Arkansas Academy of Science
We conducted a floristic survey of the Pine Bluff Arsenal during the spring, summer, and fall of 1996. In total, 622 taxa representing 113 families and 351 genera were identified and compiled into an annotated checklist. The largest families were Asteraceae (79 genera), Poaceae (73 genera). Fabaceae (41 genera), and Cyperaceae (38 genera). Exotic species composed only 8.5% of the flora. Fifty-five of the specimens represent new records for Jefferson County.
Integrating Gis And Remote Sensing With Ecosystem Research, Suzanne Wiley, Robert C. Weih Jr.
Integrating Gis And Remote Sensing With Ecosystem Research, Suzanne Wiley, Robert C. Weih Jr.
Journal of the Arkansas Academy of Science
In the Phase II Ecosystem Management Research Program in the Ouachita and Ozark National Forests, an interdisciplinary group of scientists are evaluating the effects and trade-offs of partial cutting methods in a replicated stand level study. Information from approximately 2,000 plots is being collected by more than fifty researchers during this five-year project with plans to continue data collection long term. To evaluate the effects of different management strategies and their interactions with forest resources, data must be brought into a common format and made available to all researchers. To this end, a data support system was developed which utilizes …
Factors Affecting Transformation Efficiency Of Poplar Hybrid Line Nc5331 By Agrobacterium Tumefaciens, Xin Y. Li, Feng H. Huang, Edward E. Gbur Jr.
Factors Affecting Transformation Efficiency Of Poplar Hybrid Line Nc5331 By Agrobacterium Tumefaciens, Xin Y. Li, Feng H. Huang, Edward E. Gbur Jr.
Journal of the Arkansas Academy of Science
Acetosyringone, pH, and glucose, which may affect Agrobacterium-mediated gene transformation to poplar hybrid line NC5331, were investigated in an attempt to raise the gene transfer efficiency. The Agrobacterium tumefaciens strain used harbored disarmed vector (pMON9749) carrying a bet-glucuronidase gene and a kanamycin resistant marker. With the addition of acetosyringone at 25 to 75 MuM, the transformation efficiency was significantly enhanced, but dependent on pH. Acetosyringone required a pH above 5.8 to achieve an efficient gene transfer and failed to enhance the transformation at lower pH. However, with addition of both acetosyringone and glucose, the transformation was not affected by pH. …
Ground Flora Composition Following Harvesting Of A Bottomland Hardwood Forest In The Mississippi River Batture Lands, James E. Kellum, Eric Sundell, Brian Roy Lockhart
Ground Flora Composition Following Harvesting Of A Bottomland Hardwood Forest In The Mississippi River Batture Lands, James E. Kellum, Eric Sundell, Brian Roy Lockhart
Journal of the Arkansas Academy of Science
No abstract provided.
Rediscovery Of Parnassia Asarifolia Vent (Parnassiaceae) In Arkansas, David L. Mcdaniel, Daniel L. Marsh, Winfred D. Crank
Rediscovery Of Parnassia Asarifolia Vent (Parnassiaceae) In Arkansas, David L. Mcdaniel, Daniel L. Marsh, Winfred D. Crank
Journal of the Arkansas Academy of Science
No abstract provided.