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Articles 1 - 18 of 18
Full-Text Articles in Life Sciences
Synopsis Of The Belostomatidae Of Arkansas, Phoebe A. Harp, George L. Harp
Synopsis Of The Belostomatidae Of Arkansas, Phoebe A. Harp, George L. Harp
Journal of the Arkansas Academy of Science
No abstract provided.
Management Of The Ozark Big-Eared Bat, Plecotus Townsendii Ingens, In Arkansas, Michael J. Harvey, Sam W. Barkley
Management Of The Ozark Big-Eared Bat, Plecotus Townsendii Ingens, In Arkansas, Michael J. Harvey, Sam W. Barkley
Journal of the Arkansas Academy of Science
No abstract provided.
Rotational Symmetries Of Nuclear States: Spin Determinations In Advanced Laboratory, Wilfred J. Braithwaite
Rotational Symmetries Of Nuclear States: Spin Determinations In Advanced Laboratory, Wilfred J. Braithwaite
Journal of the Arkansas Academy of Science
An advanced laboratory experiment is described which shows the connection between the rotational symmetries of nuclear states and the assignments of spins to discrete nuclear states. Standard angular correlation methods were used to study the two sequential gamma ray transitions in each ⁶⁰Ni nucleus, populated by unobserved beta decays from a weak radioactive ⁶⁰Co source. The chosen electronics and detectors were inexpensive and easy to operate. This experiment was extended to introduce students to real-world data acquisition, using finite-geometry detectors, which resulted in enormously larger coincident data rates.
Preliminary Study To Determine The Effect Of Microwaves On Green Wood, Rudolph J. Eichenberger
Preliminary Study To Determine The Effect Of Microwaves On Green Wood, Rudolph J. Eichenberger
Journal of the Arkansas Academy of Science
A preliminary study was done to determine the moisture content of green wood by treating the wood with microwaves in an oven for various times between 1 and 4 minutes. The temperature of the wood was measured immediately following the radiation with a probe interfaced to a microcomputer and with a mercury-in-glass thermometer. Temperature probes were inserted into the wood samples. Actual moisture content of the wood was determined by weighing the samples before and after drying. Half of the samples exhibited a directly proportional relationship between moisture content and temperature after microwaving. The linear relationship was not generalizable to …
Mermithid Nematodes: Sem Observations Comparing Hexamethyldisilazane And Critical Point Drying Methods, William R. Bowen, Christopher C. Hemann, Arthur A. Johnson, Barry H. Good
Mermithid Nematodes: Sem Observations Comparing Hexamethyldisilazane And Critical Point Drying Methods, William R. Bowen, Christopher C. Hemann, Arthur A. Johnson, Barry H. Good
Journal of the Arkansas Academy of Science
Morphological features of mermithid nematodes (Mermithidae) were studied with scanning electron microscopy, using hexamethyldisilazane-air drying in comparison with critical point drying via liquid carbon dioxide. Although general morphologic preservation of both HMDS-dried and CP-dried specimens was similar, structural features of the complex cuticle and internal organization were more easily resolved at higher magnifications in the HMDS-dried nematodes. These features include the superficial cuticular annulations, the fibrillar inner cuticle and peg-like microtrabeculae. The previously undescribed microtrabeculae are of special interest since they may facilitate an interaction of the mermithid (and perhaps nameatodes in general) musculature with its body wall that, at …
Vegetation Of Saratoga Landing Blackland Prairie, Thomas L. Foti
Vegetation Of Saratoga Landing Blackland Prairie, Thomas L. Foti
Journal of the Arkansas Academy of Science
Saratoga Landing Blackland Prairie is a 75-ha site owned by the U.S. Army Corps of Engineers and managed cooperatively with the Arkansas Natural Heritage Commission to protect its blackland prairie community and rare plant species. The site is a complex of prairies and forests, as interpreted from aerial photos and maps. It was substantially prairie at the time of settlement, and forest cover did not increase greatly until after 1951, apparently due to effective suppression of wildfires after that time. Plot sampling characterizes an individual prairie on the site as being dominated by a herbaceous canopy, but with a substantial …
Photosynthetic Competence Of An Endangered Shrub, Lindera Melissifolia, Robert D. Wright
Photosynthetic Competence Of An Endangered Shrub, Lindera Melissifolia, Robert D. Wright
Journal of the Arkansas Academy of Science
Net photosynthesis and water relations were investigated in situ for a population of Lindera melissifolia in northeast Arkansas. Photosynthetic light use efficiency was found to be characteristic of a shade plant. Response of photosynthesis to temperature and CO₂ was insensitive over ranges found during the growing season. High water use efficiency was demonstrated, but under typical conditions of low light this was marginally beneficial. In comparison -with competing understory plants, the species proved to be photosynthetically competent. The data are evaluated in terms of the survival potential of the species.
Fecundity Of Male White-Tailed Deer On Holla Bend National Wildlife Refuge, Thomas A. Nelson, Michael W. Johnson
Fecundity Of Male White-Tailed Deer On Holla Bend National Wildlife Refuge, Thomas A. Nelson, Michael W. Johnson
Journal of the Arkansas Academy of Science
Male reproductive tracts were collected from 57 white-tailed deer (Odocoileus virginianus) harvested on Holla Bend National Wildlife Refuge during the 1988 and 1989 archery deer seasons. Organ weights and total numbers of spermatozoa present were determined for both testes and epididymides. Among yearling and adult males, the mean weights of testes and epididymides peaked during November and decreased through the end of the collection period in mid-December. Total number of spermatozoa in the tract increased through October, peaked during the last half of November, and decreased through mid- December. No significant difference was found between the mean number of spermatozoa …
Aquatic Macroinvertebrates Of The St. Francis Sunken Lands In Northeast Arkansas, Betty G. Cochran, George L. Harp
Aquatic Macroinvertebrates Of The St. Francis Sunken Lands In Northeast Arkansas, Betty G. Cochran, George L. Harp
Journal of the Arkansas Academy of Science
The primary objective of this study was to survey the aquatic macroinvertebrate diversity of the St. Francis Sunken Lands in northeast Arkansas. Secondary objectives were a determination of their relative abundance and distributional and seasonal patterns. Sixty semi-annual collections were made from 30 stations by sampling each station 2 times for 1 ½ man-hours with a Turtox Indestructible™ dip net. Totals of 243 taxa and 13,952 organisms were recorded for the sample period (August 1987 - July 1988). Each station was assigned to 1 of 4 associations, distinguished by distinct physical factors within the river channels and the immediate watershed. …
Hematozoa Of Common Grackles (Quiscalus Quiscula Versicolor, Vieillot) In Central Arkansas, Arthur A. Johnson
Hematozoa Of Common Grackles (Quiscalus Quiscula Versicolor, Vieillot) In Central Arkansas, Arthur A. Johnson
Journal of the Arkansas Academy of Science
During the years 1977-84, 118 bronzed grackles, Quiscalus quiscula versicolor, Vieillot, of 132 examined were found infected with hematozoa. The eight species of symbionts collected from the infected birds included two microfilarial species (Chandlerella quiscali and Eufilaria hibleri), five apicomplexans (Haemoproteus quiscali, Leucocytozoon fringillinarum, Plasmodium matutinum, P. vaughani, P. sp.) and a flagellate (Trypanosoma ontarioensis). P. matutinum and T. ontarioensis represent new host records and all the protozoans represent new locality records. Comparisons are made of symbiont prevalance and diversity as this relates to seasons of the year, sex and age of the host. Comparisons are also made with previous …
Comparison Of Methods For Purification Of Dna From Rice, Theresa L. Hines, Neela R. Patel, Daoud Abu-Diab, Michael Sikes, Alvan K. Karlin
Comparison Of Methods For Purification Of Dna From Rice, Theresa L. Hines, Neela R. Patel, Daoud Abu-Diab, Michael Sikes, Alvan K. Karlin
Journal of the Arkansas Academy of Science
Three techniques were employed to purify genomic DNA from deomstic rice (Oryza sativa L). Following extraction, the DNA was electrophoresed through agarose to determine its integrity. We determined that spooling yielded better quality, through lower quantity DNA than either of the other two techniques.
Screening Rice (Oryza Sativa L.) Genotypes For Drought Tolerance Under Field Conditions, Mazo Price, Md. Jalaluddin, R. H. Dilday
Screening Rice (Oryza Sativa L.) Genotypes For Drought Tolerance Under Field Conditions, Mazo Price, Md. Jalaluddin, R. H. Dilday
Journal of the Arkansas Academy of Science
We evaluated the root pulling resistance (RPR) technique developed at the International Rice Research Institute (IRRI) for transplanted rice (Oryza sativa L.) to determine its applicability for assessing the drought tolerance of direct seeded rice. Experiments were conducted in 1988 and 1989 at the University of Arkansas at Pine Bluff Agricultural Research Farm. Fifty genotypes from four countries were grown with and without irrigation. The genotypes identified as drought tolerant germplasm by the RPR method in both years were significantly correlated. In both 1988 and 1 989, RPR was directly related to maximum root length, root number, and root dry …
Conformational And Circular Dichroism Studies On N-Acetyl-L-Prolyl-D-Alanyl-Methylamide, S. Ramaprasad
Conformational And Circular Dichroism Studies On N-Acetyl-L-Prolyl-D-Alanyl-Methylamide, S. Ramaprasad
Journal of the Arkansas Academy of Science
The compact ordered conformations of the molecule N-Acteyl-L-Prolyl-D-Alanyl-Methylamide have been studied by semiempirical energy calculations in vacuum and circular dichroism (CD) in solution. The presence of ordered structure has been observed in hydrogen bond promoting solvents like trifluoroethanol by CD studies. In hydrogen bond breaking solvents, like trifluoroacetic acid (TFA), significant fraction of the ordered conformers probably assume extended conformation without intramolecular hydrogen bonds and perhaps are in equilibrium with the fraction of compact ordered structures. The trend observed in going from nonpolar to polar solvent is also compatible with the previous NMR studies in solution. The semiempirical energy calculations …
Sexual Dimorphism And Intersexual Differences In Resource Allocations Of A Dioecious Shrub, Lindera Melissifolia (Walt.) Blume, Dennis J. Richardson, Robert D. Wright, Shannon Walker
Sexual Dimorphism And Intersexual Differences In Resource Allocations Of A Dioecious Shrub, Lindera Melissifolia (Walt.) Blume, Dennis J. Richardson, Robert D. Wright, Shannon Walker
Journal of the Arkansas Academy of Science
Morphometric data were gathered to make intersexual comparisons on the morphology and reproductive resource allocation patterns of the rare, dioecious shrub, Lindera melissifolia. Females produced significantly fewer flowers and leaves than did males. No other significant differences could be detected in morphology. Female "clones" exhibit low area coverage and low stem density, which suggests higher costs of reproduction. If this is the case, the deficits produced in resource allocations directed toward sexual reproduction seem to result in increased mortality and/or reduced vegetative reproduction.
Pellet Analysis Of Winter-Roosting Long-Eared Owls (Asio Otus) In Arkansas, Norman Lavers
Pellet Analysis Of Winter-Roosting Long-Eared Owls (Asio Otus) In Arkansas, Norman Lavers
Journal of the Arkansas Academy of Science
No abstract provided.
Reproductive Phenophases And Clutch Characteristics Of Selected Arkansas Amphibians, Stanley E. Trauth, Robert L. Cox Jr., Brian P. Butterfield, David A. Saugey, Walter E. Meshaka Jr.
Reproductive Phenophases And Clutch Characteristics Of Selected Arkansas Amphibians, Stanley E. Trauth, Robert L. Cox Jr., Brian P. Butterfield, David A. Saugey, Walter E. Meshaka Jr.
Journal of the Arkansas Academy of Science
Seasonal reproductive phenomena in 13 species of salamanders and 16 species of anurans from Arkansas were investigated. Most specimens were collected during a span of 6 years (1985-1990). Clutch characteristics, including mensural and meristic data, were determined from gravid females. In some species, the size of egg masses was also documented. Among the plethodontid salamanders, average clutch size (in parentheses) was greatest in Eurycea lucifuga (77.7) and smallest in Plethodon serratus (7.0). One of 2 ambystomatid salamanders (Ambystoma texanum) averaged 545.4 eggs per clutch; the other species (Ambystoma tigrinum) averaged 1 30.5. Siren intermedia nettingi (one of 3 large salamanders …
Time Course Of Photoreactivation Of Uv Induced Damage In G1 Phase Xenopus Cells That Leads To Chromosome Breaks Observable By Premature Chromosome Condensation, Robert Wright, Stephen Ruble, H. Gaston Griggs
Time Course Of Photoreactivation Of Uv Induced Damage In G1 Phase Xenopus Cells That Leads To Chromosome Breaks Observable By Premature Chromosome Condensation, Robert Wright, Stephen Ruble, H. Gaston Griggs
Journal of the Arkansas Academy of Science
No abstract provided.
Analysis Of The Fall And Winter Diet Of The Bobcat In Eastern Arkansas, C. Renn Tumlison, V. Rick Mcdaniel
Analysis Of The Fall And Winter Diet Of The Bobcat In Eastern Arkansas, C. Renn Tumlison, V. Rick Mcdaniel
Journal of the Arkansas Academy of Science
Food habits of the bobcat (Felis rufus) in eastern Arkansas were examined based on stomach contents of 148 specimens. Rabbits (Sylvilagus floridanus and S. aquaticus) were the primary food source for males, females, and kittens. Rice rats (Oryzomys palustris), nutria (Myocastor coypus), and several species of waterfowl are first reported as food of bobcats in Arkansas. Cotton rats (Sigmodon hispidus) and muskrats (Ondatra zibethica) were more common in bobcat diets in eastern versus western Arkansas. Adult males did not use smaller prey but this food source was common, in kittens; females were intermediate in their use of smaller prey.