Open Access. Powered by Scholars. Published by Universities.®
Articles 31 - 60 of 245
Full-Text Articles in Entire DC Network
Effect Of Tillage And Herbicide Treatments On Redvine (Brunnichia Ovata) Subterranean Morphology, E. C. Gordon, T. C. Keisling, L. R. Oliver, T. A. Castillo
Effect Of Tillage And Herbicide Treatments On Redvine (Brunnichia Ovata) Subterranean Morphology, E. C. Gordon, T. C. Keisling, L. R. Oliver, T. A. Castillo
Journal of the Arkansas Academy of Science
Redvine Brunnichia ovata (Walt.) Shinners is a perennial weed that reproduces from seed, rootstock, and rhizomes. Redvine infested areas that were exposed to different tillage practices, slicing techniques, and herbicide treatments were selected to excavate in order to observe rhizome and root morphology. When comparing tillage systems, deep tillage appeared to delay rhizome development following cultivation, but a characteristic branching occurred over time. Shallow cultivation (2.5 to 7.5m) concentrated rhizomes immediately below the depth of tillage; whereas, no-till areas concentrated rhizomes near the soil surface. Slicing the underground parts of redvine will not kill rhizomes if they are still attached …
Checklist Of Major Plant Species In Ashley County, Arkansas Noted By General Land Office Surveyors, Don C. Bragg
Checklist Of Major Plant Species In Ashley County, Arkansas Noted By General Land Office Surveyors, Don C. Bragg
Journal of the Arkansas Academy of Science
The original General Land Office (GLO) survey notes for the Ashley County, Arkansas, area were examined to determine the plant taxa mentioned during the 1818 to 1855 surveys. While some challenges in identifying species were encountered, at least 39 families and approximately 100 species were identified with reasonable certainty. Most references were for trees used to witness corners or lines. Prominent arboreal genera recorded in these early survey records included Quercus, Pinus, Carya, Liquidambar, Nyssa, Ulmus, Acer, Fraxinus, and Taxodium. A number of shrubs, vines, graminoids, and herbaceous species were also reported, including notable genera like Vaccinium, Lindera, Crataegus, Myrica, …
Fire Effects On Three Trophic Levels In A Central Arkansas Grassland, Laura Skelton, Amy Polk, Brenna C. Fitzgerald, Matthew D. Moran
Fire Effects On Three Trophic Levels In A Central Arkansas Grassland, Laura Skelton, Amy Polk, Brenna C. Fitzgerald, Matthew D. Moran
Journal of the Arkansas Academy of Science
We studied the effect of a late growing-season fire on the plant and foliar arthropod communities in a naturally occurring grassland. In central Arkansas, these grasslands are common on south-facing slopes where shallow soils and hot/dry weather conditions during the summer cannot support the growth of a forest community. Patches of grassland were burned in the autumn (4 November, late growing season), often the time of natural fires in Arkansas, and compared to unburned areas. Fire increased the biomass of forbs and decreased the biomass of grasses, although overall biomass was not different between treatments. Among the foliar arthropods, herbivores …
Arkansas Field Botany (Flora And Vegetation) Bibliography (1988-2000), James H. Peck, C. Theo Witsell, Thomas L. Foti
Arkansas Field Botany (Flora And Vegetation) Bibliography (1988-2000), James H. Peck, C. Theo Witsell, Thomas L. Foti
Journal of the Arkansas Academy of Science
The floristic richness and diversity of vegetation in Arkansas continues to require and stimulate a growing body of taxonomic and ecological research publications. Peck and Peck (1988) listed 766 references, including those of the two prior lists. Since then we have gathered 417 additional references. The total list now contains 1,183 references, with 70% prepared or published since 1970. This update is provided for four reasons: 1) to compile a comprehensive source to direct and facilitate future studies, 2) to provide easier access to many reports not normally located in electronic databases, 3) to improve communications with botanists outside Arkansas, …
Diversity Of Lamium (Lamiceae) In Arkansas, Including Occurrences Of Lamium Hybridum And Flower Color Forms, Jason A. Haley, Daniel L. Marsh
Diversity Of Lamium (Lamiceae) In Arkansas, Including Occurrences Of Lamium Hybridum And Flower Color Forms, Jason A. Haley, Daniel L. Marsh
Journal of the Arkansas Academy of Science
No abstract provided.
Characterization Of A PorosTm-Fumonisin B1 Affinity Column For Isolating Ceramide Synthase From Rat Liver, S. Jernigan, W. B. Melchior Jr., G. R. Jenkins, K. L. Rowland, D. W. Roberts, P. C. Howard, H. Tolleson
Characterization Of A PorosTm-Fumonisin B1 Affinity Column For Isolating Ceramide Synthase From Rat Liver, S. Jernigan, W. B. Melchior Jr., G. R. Jenkins, K. L. Rowland, D. W. Roberts, P. C. Howard, H. Tolleson
Journal of the Arkansas Academy of Science
Fumonisin B1 is a mycotoxin produced by fungi of the genus Fusarium, common pathogens of corn and other grain plants. Toxic effects associated with fumonisin B1 include equine leukoencephalomacia, porcine pulmonary edema, rat renal carcinoma, and murine hepatocellular carcinoma. Increased risk for esophageal cancer in humans has been epidemiologically associated with consumption of corn contaminated with Fusarium, suggesting that fumonisin B1 may be involved. The biological effects of fumonisin B1 exposure result primarily from disruption of de novo sphingolipid biosynthesis via inhibition of ceramide synthase. Exposure of animals or cultured cells to fumonisin B1 results in the characteristic accumulation of …
Survey Of Salvinia (Salviniaceae) In Eastern Arkansas, James H. Peck
Survey Of Salvinia (Salviniaceae) In Eastern Arkansas, James H. Peck
Journal of the Arkansas Academy of Science
Salvinia, water spangles, is a genus of 10 species of free-floating heterosporous aquatic ferns with two species introduced to North America. S. minima Baker was introduced into the eastern United States by at least 1814 and occurs mainly across the southeastern United States. S. molesta Mitchell was recognized as a distinct species in the 1970s, was introduced into the United States as a water-garden plant in the 1980s, and has escaped and spread across the southeastern United States in the 1990s. It is recognized by federal agency as noxious aquatic weed. S. minima Baker was discovered in Arkansas in 1998. …
Status Report On Harperella, Ptilimnium Nodosum (Rose) Mathias, In Arkansas, Edith L. Hardcastle, David X. Williams
Status Report On Harperella, Ptilimnium Nodosum (Rose) Mathias, In Arkansas, Edith L. Hardcastle, David X. Williams
Journal of the Arkansas Academy of Science
No abstract provided.
Ouachita Mountain Population Of Diphasiastrum Digitatum (Dillenius Ex. A. Braun (Holub)) Reported In Montgomery County On The Ouachita National Forest, Terry Keith Mckay, Daniel L. Marsh
Ouachita Mountain Population Of Diphasiastrum Digitatum (Dillenius Ex. A. Braun (Holub)) Reported In Montgomery County On The Ouachita National Forest, Terry Keith Mckay, Daniel L. Marsh
Journal of the Arkansas Academy of Science
No abstract provided.
Optical Transmittance Of A Rice Leaf Via Ray Tracing, Stephen Nicoletti, Alois (Al) J. Adams
Optical Transmittance Of A Rice Leaf Via Ray Tracing, Stephen Nicoletti, Alois (Al) J. Adams
Journal of the Arkansas Academy of Science
Optical reflectance from a plant leaf increases in response to stress and disease. Previous studies at the University of Arkansas at Little Rock found that, while the reflectance from a rice leaf increased with increased salinity, reflectance changes could not be used to differentiate one stress or disease from another. The objective of this study is to characterize the angular distribution of optical transmittance for a healthy rice leaf using a ray tracing technique and assuming a three-media optical model. The ultimate goal is to relate this distribution to specific plant pathologies. Three rays are traced through the cross section …
Floristic Status Of Log Ferns (Dryopteris) In Arkansas, James H. Peck
Floristic Status Of Log Ferns (Dryopteris) In Arkansas, James H. Peck
Journal of the Arkansas Academy of Science
The fern flora of Arkansas consists of 96 taxa, including five species and three hybrids of the Log Fern genus Dryopteri This report summarizes a twenty year floristic and ecologic study of their distribution and abundance in Arkansas. Historica data are presented to review the slow accumulation of taxa reported in floras of Arkansas from early collectors to 1980 and the rapid accumulation of taxa since 1980 employing modern field techniques. Chorological data and floristic data are presented based on field, herbarium, and literature studies to correct the record and document the known localities of the eight Arkansas taxa: Dryopteris …
Characteristics Of Some Fruiting Plant Species In Northwest Arkansas, And The Avian Assemblages That Feed On Them, John W. Prather, Kimberly G. Smith, Michael A. Mlodinow, Cecilia M. Riley
Characteristics Of Some Fruiting Plant Species In Northwest Arkansas, And The Avian Assemblages That Feed On Them, John W. Prather, Kimberly G. Smith, Michael A. Mlodinow, Cecilia M. Riley
Journal of the Arkansas Academy of Science
Fruits continue to be recognized as an important food source for birds in temperate areas, particularly during the fall migration period. More than 20 species of plants producing fleshy fruits are found in the Arkansas Ozarks. However, only a few of these appear to be important resources for birds during the fall migration period (August - October). Among those are sassafras (Sassafras albidum), gray-backed grape (Vitis cinerea), black cherry (Prunus serotina), hercules club (Araliaspinosa) and pokeweed (Phytolacca americana). Over the past 4 years, we have documented the physical and nutritional characteristics of those fruits and taken observational data on the …
Occurrences Of Petalphyllum (Fossombroniaceae) In The Interior Highlands Of Arkansas, Jared W. Kyzer, Daniel L. Marsh
Occurrences Of Petalphyllum (Fossombroniaceae) In The Interior Highlands Of Arkansas, Jared W. Kyzer, Daniel L. Marsh
Journal of the Arkansas Academy of Science
No abstract provided.
Variations In Sphaerocarpos (Marcantiopsida) In Arkansas, Timothy A. Golden, Daniel L. Marsh
Variations In Sphaerocarpos (Marcantiopsida) In Arkansas, Timothy A. Golden, Daniel L. Marsh
Journal of the Arkansas Academy of Science
No abstract provided.
Floristic Inventory Of Three Bogs On Crowley's Ridge In Arkansas, Staria S. Vanderpool, Edward Leon Richards
Floristic Inventory Of Three Bogs On Crowley's Ridge In Arkansas, Staria S. Vanderpool, Edward Leon Richards
Journal of the Arkansas Academy of Science
A floristic inventory of vascular plant taxa of three wetlands known locally as bogs on Crowley's Ridge in Greene and Clay counties was conducted from August 1979 to July 1981. Total combined area of the three sites was 9.2 ha with a range from 2.3 ha to 4.3 ha. Overall 360 taxa representing 227 genera and 92 families were collected from the bogs and surrounding upland forest and identified. Plant taxa from bog sites ranged from 81 to 89 species with 35 species collected from all 3 bogs and 26 found in 2 of the 3 sites. Among the taxa …
Rediscovery Of Marsilea Vestita Subsp. Vestita In Pulaski County, Arkansas After 162 Years, Theo Witsell, William M. Shepherd
Rediscovery Of Marsilea Vestita Subsp. Vestita In Pulaski County, Arkansas After 162 Years, Theo Witsell, William M. Shepherd
Journal of the Arkansas Academy of Science
No abstract provided.
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.
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 …
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.
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.
Partial Characterization Of Bacteriophages Of Pseudomonas Syringae Pv.Tomato, Scott M. Minor, Russell O. Nordeen, Chad E. Paschall
Partial Characterization Of Bacteriophages Of Pseudomonas Syringae Pv.Tomato, Scott M. Minor, Russell O. Nordeen, Chad E. Paschall
Journal of the Arkansas Academy of Science
No abstract provided.
Plantain Sunflower (Helianthus Occidentalis Subsp. Plantagineus) In Arkansas, Daniel L. Marsh, Timothy A. Golden
Plantain Sunflower (Helianthus Occidentalis Subsp. Plantagineus) In Arkansas, Daniel L. Marsh, Timothy A. Golden
Journal of the Arkansas Academy of Science
No abstract provided.
Effect Of Thidiazuron And Benzylaminopurine On In Vitro Shoot Proliferation Of Carnation (Dianthus Caryophyllus L.), Mohanjeet S. Brar, Jameel M. Al-Khayri, Gerald L. Klingaman
Effect Of Thidiazuron And Benzylaminopurine On In Vitro Shoot Proliferation Of Carnation (Dianthus Caryophyllus L.), Mohanjeet S. Brar, Jameel M. Al-Khayri, Gerald L. Klingaman
Journal of the Arkansas Academy of Science
Carnations (Dianthus caryophyllus L.) are among the most widely used cut flowers in the world. Tissue culture techniques offer an efficient method for the micropropagation of carnations. This study was conducted to test the effect of thidiazuron (TDZ) and benzylaminopurine (BAP), artificial cytokinins, on shoot multiplication of two carnation cultivars, Barlo II Nora and Raggio di Sole. Isolated axillary buds were cultured on Gamborg's (B-5) basal medium supplemented with 30 g/L sucrose and 8 g/L agar. The cultures were maintained at a 10-h photoperiod (40 (mu-Em2s-1) and 23°C±2C°. Number of multiple shoots produced was dependent upon the genotype and was …
Callus Induction And Plant Regeneration Of Commercial Rice (Oryza Sativa L.) Cultivars, Jameel M. Al-Khayri, Edwin J. Anderson
Callus Induction And Plant Regeneration Of Commercial Rice (Oryza Sativa L.) Cultivars, Jameel M. Al-Khayri, Edwin J. Anderson
Journal of the Arkansas Academy of Science
Manipulation of agronomic traits at the cellular and molecular levels offers an efficient approach to enhance conventional breeding efforts for rice improvement. Plant regeneration protocols, required for biotechnological applications, have not yet been developed for a number of important rice cultivars. This study was conducted to establish a system for plant regeneration of elite rice cultivars adapted to the southern U.S.A. Callus was induced from dehusked grains of cultivars Alan, Katy, and LaGrue, on MS media containing 0.5, 2, and 4 mg L-1 2,4-D, with 0.5 mg L-1 kinetin or without kinetin. Plant regeneration was accomplished by transferring the callus …
Checklist And Distribution Of Arkansas Pteridophytes, James H. Peck, W. Carl Taylor
Checklist And Distribution Of Arkansas Pteridophytes, James H. Peck, W. Carl Taylor
Journal of the Arkansas Academy of Science
Over the past 14 years, an effort was made to summarize and improve our knowledge of the Arkansas pteridophyte flora beyond that developed by Taylor and Demaree (1979). They presented a flora of 68 species plus 2 varieties plus 4 hybrids, for a total of 74 taxa vouchered with 1335 county-level occurrence records. Changes in accepted nomenclature, field work, and herbaria searches have added as new to the flora 10 species plus 1 variety plus 7 hybrids, supported with 74 county-level occurrence records. Another 815 county-level occurrence records were added to the known flora. The Arkansas pteridophyte flora now consists …
Distance Of Interference Of Red Rice (Orya Sativa) In Rice (O. Sativa), Sam L. Kwon, Roy J. Smith Jr., Ronald E. Talbert
Distance Of Interference Of Red Rice (Orya Sativa) In Rice (O. Sativa), Sam L. Kwon, Roy J. Smith Jr., Ronald E. Talbert
Journal of the Arkansas Academy of Science
Three rice cultivars were grown to determine the distance at which red rice affects growth and grain yield. Red rice reduced grain yield of Lemont when rice plants grew within 71 and 53 cm of red rice in 1986 and 1988, respectively. Grain yield of Newbonnet was reduced when grown within 53 cm of red rice in both years. Grain yield of Tebonnet was reduced when grown within 53 and 36 cm of red rice in 1986 and 1988, respectively. Grain yield reduction in influenced areas averaged 35, 26 and 21% for Lemont, Newbonnet, and Tebonnet, respectively. As the distance …
First Record Of Leptodora Kindti In Dardanelle Reservoir And Status Of Other Recent Additions To Dardanelle Fauna, John D. Rickett, Robert L. Watson
First Record Of Leptodora Kindti In Dardanelle Reservoir And Status Of Other Recent Additions To Dardanelle Fauna, John D. Rickett, Robert L. Watson
Journal of the Arkansas Academy of Science
No abstract provided.