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Articles 1 - 30 of 40
Full-Text Articles in Life Sciences
A Check-List Of The Spiders Of Arkansas, Peggy Rae Dorris
A Check-List Of The Spiders Of Arkansas, Peggy Rae Dorris
Journal of the Arkansas Academy of Science
Collections of spiders were made from 1966, to the present in the six physiographic regions of Arkansas. During this time 435 species representing 35 families were collected and recorded.
Analysis Of Arkansas Fur Harvest Records - 1942-1984: I. State And Regional Accounts, Gary A. Heidt, James H. Peck, Tiny Sheldon, Joseph D. Clark
Analysis Of Arkansas Fur Harvest Records - 1942-1984: I. State And Regional Accounts, Gary A. Heidt, James H. Peck, Tiny Sheldon, Joseph D. Clark
Journal of the Arkansas Academy of Science
Fur harvest records maintained by the Arkansas Game and Fish Commission from 1942-1984 summarized the number of pelts sold by region (Ozark Mountains, Ouachita Mountains, Gulf Coastal Plain, and Mississippi Delta) and the average price per pelt for 16 furbearers. Analysis of these records showed that in the 1979-80 trapping season (the record year for both harvest and value both in Arkansas and the nation), the value of the Arkansas fur harvest ranked 14th nationally (2.12% of total national value). Fur harvests in Arkansas were high in the 1940's, declined in the 1950's and 1960's and then experienced a rapid …
Fluctuations And Relationships Of Selected Physiochemical Parameters In Dardanelle Reservoir, Arkansas, 1975-1982, John D. Rickett, Robert L. Watson
Fluctuations And Relationships Of Selected Physiochemical Parameters In Dardanelle Reservoir, Arkansas, 1975-1982, John D. Rickett, Robert L. Watson
Journal of the Arkansas Academy of Science
Annual and seasonal fluctuations and relationships are described for discharge, turbidity, chloride, total hardness, conductivity and suspended solids over an eight-year period in Dardanelle Reservoir. The parameters fluctuated rather widely primarily in response to seasonal patterns of rainfall. Chloride and conductivity were related and generally fluctuated together as did turbidity and suspended solids. Hardness appeared to vary independently of the others prior to 1979 then varied more closely with chloride after March 1979. Inherent differences between the Illinois Bayou arm and the main Arkansas River sections complicated the precise identification of any overall impact of power plant operation. No significant …
Incidence Of Giardia In Arkansas Beaver, Gary A. Heidt, Ann H. Nichols, James J. Daly
Incidence Of Giardia In Arkansas Beaver, Gary A. Heidt, Ann H. Nichols, James J. Daly
Journal of the Arkansas Academy of Science
No abstract provided.
Report On Fish Collections From The Ouachita River Basin, Arkansas, John A. Baker
Report On Fish Collections From The Ouachita River Basin, Arkansas, John A. Baker
Journal of the Arkansas Academy of Science
Collections of fishes were made throughout the Ouachita River system of southern Arkansas during July and August 1983. Seventeen sites were sampled using boat arid backpack electroshocker, experimental gill nets, hoop nets, and seines. A total of 8011 fish representing 79 species and one hybrid combination was taken in the study. Comments are presented on the distribution, habitat, and ecology of fishes collected.
Effects Of Litter On Aquatic Macrophyte Germination And Growth, Mark F. Carter, Forrest E. Lane, James B. Grace
Effects Of Litter On Aquatic Macrophyte Germination And Growth, Mark F. Carter, Forrest E. Lane, James B. Grace
Journal of the Arkansas Academy of Science
In Arkansas, during seasonal drought periods, lake water levels drop leaving exposed mudflats which are primary sites for seedling establishment. Commonly, these exposed mudflats are partially covered with decomposing litter from previous stands of aquatic plants. In this study, aqueous leachates from the litter of four macrophytes, Eleocharis quadrangulata, Justicia americana, Polygonum lapathifolium, and Potamogeton nodosus, were used to test for chemical interference with germination and seedling growth. Only Justicia americana leachate was found to affect the growth of several of the test species. The potential for chemical interference by Justicia litter was evaluated further using extracts of acidified leachate. …
Southern Woodfern, Dryopteris X Australis, New To Arkansas, Steve L. Orzell, James H. Peck
Southern Woodfern, Dryopteris X Australis, New To Arkansas, Steve L. Orzell, James H. Peck
Journal of the Arkansas Academy of Science
No abstract provided.
Observations And New Records Of Ferns Naturalizing In Arkansas, James H. Peck, Lance Peacock, William M. Shepherd
Observations And New Records Of Ferns Naturalizing In Arkansas, James H. Peck, Lance Peacock, William M. Shepherd
Journal of the Arkansas Academy of Science
No abstract provided.
Effects Of Gamma Radiation On Salix Nigra Marsh Cuttings, Roy Z. Gehring
Effects Of Gamma Radiation On Salix Nigra Marsh Cuttings, Roy Z. Gehring
Journal of the Arkansas Academy of Science
Dormant cuttings of Salix nigra Marsh, were exposed to gamma radiation from a cobalt-60 source at a dose rate of 1110 roentgens (r) per minute. Exposure doses ranged from 50 r through 100 Kr with 100% mortality at 10 Kr. Low doses of ionizing radiation apparently stimulated growth, while higher doses progressively retarded growth. The growth of the staminate catkins was inversely proportional to total exposure dose (increased dose resulted in progressively decreased growth). Determination of growth rates at different intervals post-irradiation indicated recovery of the surviving fraction of the irradiated cuttings. At ninety days, the highest growth rate occurred …
Concanavalin A-Binding Enzymes Of Crotalus Scutulatus Scutulatus Venom, Michael W. Hinson, C. K. Childs, Bob D. Johnson, Dewey H. Sifford
Concanavalin A-Binding Enzymes Of Crotalus Scutulatus Scutulatus Venom, Michael W. Hinson, C. K. Childs, Bob D. Johnson, Dewey H. Sifford
Journal of the Arkansas Academy of Science
Crotalus scutulatus scutulatus crude venom was separated into two fractions by Concanavalin A Sepharose 4B affinity chromatography. The proteins binding to Con A exhibited phosphomonoesterase (orthophosphoric monoester phosphohydrolase EC 3.1.3.2), phosphodiesterase, 5'-nucleotidase (5'-ribonucleotide phosphohydrolase EC 3.1.3.5), phospholipase A(phosphatidate 2-acylhydrolase EC 3.1.1 .4), hyaluronidase (hyaluronate glycanohydrolase EC 3.2.1 d), N-benzoyl-L-arginine ethyl esterase, p-toluenesulfonyl-L-arginine methyl esterase, L-amino acid oxidase (L-amino acid: 02 oxidoreductase [deaminating] EC 1.4.3.2), and caseinolytic activities. Thrombin-like and NAD nucleosidase (5'-ribonucleotide phosphohydrolase EC 3.1.3.5) activities were not observed. The crude venom and the fraction containing the glycoproteins which bound to Con A were fractionated by DEAE Sephadex A-50 ion …
Changes In Forest Soils Following Clearcutting Of Pine Forests In The Ouachita Mountains Of Arkansas, Harlan R. Stoin, Bajuri Bin Kadmin, Lyell F. Thompson
Changes In Forest Soils Following Clearcutting Of Pine Forests In The Ouachita Mountains Of Arkansas, Harlan R. Stoin, Bajuri Bin Kadmin, Lyell F. Thompson
Journal of the Arkansas Academy of Science
Soil characteristics of the mineral surface soil (0-6 cm) on three small watersheds in the Ouachita Mountains of Arkansas from which the pine forests have been clearcut, crushed, and burned for site preparation were studied for the first two years following clearcutting and compared to soils from adjacent uncut pine forest watersheds. Following clearcutting and burning, soil pH was generally higher than in uncut forest soils. The greatest pH differences occurred within several months of burning and generally decreased through the end of the second year. Soil organic matter content was lower immediately following clearcutting and burning and increased to …
Dytiscidae From Randolph County, Arkansas, Mark A. Pippenger, George L. Harp
Dytiscidae From Randolph County, Arkansas, Mark A. Pippenger, George L. Harp
Journal of the Arkansas Academy of Science
No abstract provided.
Comparative Study Of Lactate Dehydrogenase Activity In Diving And Nondiving Reptiles, Dennis A. Baeyens, Deborah Bursey, Robert Rountree
Comparative Study Of Lactate Dehydrogenase Activity In Diving And Nondiving Reptiles, Dennis A. Baeyens, Deborah Bursey, Robert Rountree
Journal of the Arkansas Academy of Science
The properties of lactate dehydrogenase (LDH) were examined in two snake species and one turtle species. The snakes used in the study were the semi-aquatic Nerodia rhombifera and the terrestrial Elaphe obsoleta, while Pseudemys scripta represented the turtle species. Our purpose was to compare the LDH activity of nondiving reptiles (Nerodia and Elaphe) with that of the well established diver Pseudemys. The kinetic properties of LDH and its susceptibility to inhibition by elevated pyruvate concentrations were investigated in the brain and heart of the three species. Brain and heart were chosen because they are highly aerobic tissues and therefore should …
Population Trends Of The Loggerhead Shrike (Lanius Ludovicianus) In Arkansas, Fred L. Burnside Jr., William M. Shepherd
Population Trends Of The Loggerhead Shrike (Lanius Ludovicianus) In Arkansas, Fred L. Burnside Jr., William M. Shepherd
Journal of the Arkansas Academy of Science
No abstract provided.
Effects Of Temperature And Crowding On The Pathogenicity Of Edwardsiella Ictaluri In Channel Catfish (Ictalurus Punctatus), Sharon L. Johnson, Lawrence W. Hinck
Effects Of Temperature And Crowding On The Pathogenicity Of Edwardsiella Ictaluri In Channel Catfish (Ictalurus Punctatus), Sharon L. Johnson, Lawrence W. Hinck
Journal of the Arkansas Academy of Science
Channel catfish were injected with Edwardsiella ictaluri and stocked at increasing temperatures and densities. Bacteriological examination of kidney, liver and spleen revealed the greatest numbers of organisms in fish from the highest temperature and stocking density tested. Survival time was the shortest for fish held at the highest temperature and stocking density. Increased temperature and crowding were directly proportional to the number of organisms recovered from the organs and inversely proportional to fish survival time.
Role Of Centriolar Matrix And Striated Rootlets In Centriolar Pairing And Orientation During Spermatogenesis In Hydractina Echinata, Maurice G. Kleve
Role Of Centriolar Matrix And Striated Rootlets In Centriolar Pairing And Orientation During Spermatogenesis In Hydractina Echinata, Maurice G. Kleve
Journal of the Arkansas Academy of Science
Transmission electron microscopy of the spermatogenic stages of the hydroid, Hydractinia echinata, reveals a series of complex structural and positional changes in the centrioles of spermatocytes and spermatids. The newly generated centriolar pairs of spermatocytes form an unusual four-centriole aggregate that persists until cell division. The distal centrioles of this aggregate are shrouded with a very dense matrix that accumulates after centriolar replication. This matrix facilitates the mechanical attachment between distal centrioles and microtubular nucleating satellites, striated rootlets and pericentriolar processes. The association of these accessory structures occurs sequentially and is repeated in spermatocytes and spermatids. An electron dense plaque, …
Corticocortical Projections Of A Visually Responsive Area In The Cat Brain, Joseph Mcgrath
Corticocortical Projections Of A Visually Responsive Area In The Cat Brain, Joseph Mcgrath
Journal of the Arkansas Academy of Science
The Clare-Bishop (CB) area bears the name of the investigators who first (1954) demonstrated a cortical area in the cat brain located along the lateral aspect of the middle suprasylvian gyrus which responded electrophysiologically to both optic nerve and striate cortex (area 17) stimulation. More recent studies of CB or the lateral suprasylvian (LS) area have supported its role in visual and/or oculomotor functions. Silver degeneration methods were undertaken to clarify some of the corticocortical connections of this cortical region. The data accumulated provides a morphological basis in support of the CB area's role in visual and/or oculomotor activities
Model To Predict Arkansas Gray Fox Fur Harvests, James H. Peck, Gary A. Heidt
Model To Predict Arkansas Gray Fox Fur Harvests, James H. Peck, Gary A. Heidt
Journal of the Arkansas Academy of Science
Linear regression analysis of total gray fox (Urocyon cinereoargenteus) fur harvests from 1954-1983 in Arkansas showed a high correlation with mean pelt values (r = 0.956). Single variable models using linear regression analyses of current season's pelt values (CSPV) and previous season's pelt values (PSPV) were designed to predict fur harvests. These models demonstrated high correlations for predicting harvests (r = 0.933 and r = 0.893 respectively). Regional analyses revealed a high correlation between mean pelt values and harvest for the Ozark Mountain region (r = 0.923), Ouachita Mountain region (r = 0.971 ), and Gulf Coastal Plain (r = …
Age And Growth Of The Bluegill Lepomis Macrochrius Rafinesque From An Unmanaged Watershed Lake In Northeast Arkansas With Observations On Lake Ecology, Stephen A. Sewell
Age And Growth Of The Bluegill Lepomis Macrochrius Rafinesque From An Unmanaged Watershed Lake In Northeast Arkansas With Observations On Lake Ecology, Stephen A. Sewell
Journal of the Arkansas Academy of Science
Age and growth data were compiled on 114 bluegill, Lepomis macrochirus Rafinesque, taken from floodwater retarding structure #15 of the Big Creek Watershed project in Craighead and Greene counties of northeast Arkansas. This project was completed in the early 1960's by USDA-SCS. The 73 surface acre lake has not been managed for fish production and has been subjected to unscheduled water level manipulations during dry weather periods. These manipulations have maintained the bluegill population in healthy condition. The oldest bluegill collected were age class IV+. Average condition coefficient K(TL)declined from oldest to youngest individuals (2.96 in age class IV+ - …
Analysis Of Arkansas Fur Harvest Records - 1942-1984: Iii. Harvest-Price Relationships, Joseph D. Clark, Gary A. Heidt, Tina Sheldon, James H. Peck
Analysis Of Arkansas Fur Harvest Records - 1942-1984: Iii. Harvest-Price Relationships, Joseph D. Clark, Gary A. Heidt, Tina Sheldon, James H. Peck
Journal of the Arkansas Academy of Science
Correlation and linear regression analyses between mean annual pelt price and total harvest of 13 Arkansas furbearer species between 1965 and 1983 were performed for state and regions (Ozark Mountains, Ouachita Mountains, Gulf Coastal Plain, and Mississippi Delta). Statewide, strong correlations (r > 0.80) were identified for bobcat (Felis rufus), coyote (Canis latrans), gray fox (Urocyon cinereoargenteus), mink (Mustela vison), nutria (Myocastor coypus), opossum (Didelphis virginiana), and raccoon (Procyonlotor). Moderate correlations (r = 0.55 - 0.79) were identified for eastern spotted skunk (Spilogale putorius), muskrat (Ondatra zibethicus), river otter (Lutra canadensis), and striped skunk (Mephitis mephitis). Nonsignificant correlations (r < 0.468) were shown for beaver (Castor canadensis) and long-tailed weasel (Mustela frenata). Regional differences were noted for each species.
Reports Of Albino Birds In Arkansas Since 1968, Earl L. Hanebrink
Reports Of Albino Birds In Arkansas Since 1968, Earl L. Hanebrink
Journal of the Arkansas Academy of Science
No abstract provided.
Range Extension Of The Porcupine (Erethizon Dorsatum) Into Southwest Arkansas, Joseph D. Clark
Range Extension Of The Porcupine (Erethizon Dorsatum) Into Southwest Arkansas, Joseph D. Clark
Journal of the Arkansas Academy of Science
No abstract provided.
Flow Reduction May Explain Sporadic Occurrence Of Craspedacusta Sowerbyi (Trachylina) Medusae, Peter P. Brussock, Lawrence D. Willis, Arthur V. Brown
Flow Reduction May Explain Sporadic Occurrence Of Craspedacusta Sowerbyi (Trachylina) Medusae, Peter P. Brussock, Lawrence D. Willis, Arthur V. Brown
Journal of the Arkansas Academy of Science
No abstract provided.
Distribution And Status Of Etheostoma Cragini Gilbert And E. Microperca Jordan And Gilbert In Arkansas, John L. Harris, Kenneth L. Smith
Distribution And Status Of Etheostoma Cragini Gilbert And E. Microperca Jordan And Gilbert In Arkansas, John L. Harris, Kenneth L. Smith
Journal of the Arkansas Academy of Science
No abstract provided.
Fall Deer Food Selection In The Ouachita National Forest, James D. Fenwood, David A. Saugey, Carl A. Racchini
Fall Deer Food Selection In The Ouachita National Forest, James D. Fenwood, David A. Saugey, Carl A. Racchini
Journal of the Arkansas Academy of Science
No abstract provided.
Synopsis Of The Hydrometridae Of Arkansas, George L. Harp
Synopsis Of The Hydrometridae Of Arkansas, George L. Harp
Journal of the Arkansas Academy of Science
No abstract provided.
Notes On Three Palustrine Natural Community Types In The Arkansas Ozarks, Steve L. Orzell, William F. Pell, Gary E. Tucker
Notes On Three Palustrine Natural Community Types In The Arkansas Ozarks, Steve L. Orzell, William F. Pell, Gary E. Tucker
Journal of the Arkansas Academy of Science
No abstract provided.
Identifying Perplexing Chickadee Specimens From Skeletal Material, Douglas A. James, James D. Rising
Identifying Perplexing Chickadee Specimens From Skeletal Material, Douglas A. James, James D. Rising
Journal of the Arkansas Academy of Science
No abstract provided.
Pesticide Use In The 1983 Soybean Crop: Report Of A Survey Of Arkansas Producers, Joseph D. Waldrum
Pesticide Use In The 1983 Soybean Crop: Report Of A Survey Of Arkansas Producers, Joseph D. Waldrum
Journal of the Arkansas Academy of Science
No abstract provided.
Demonstration Of A Heat-Stable Cyclic Gmp Phosphodiesterase In The Medium Of Physarum Flavicomum, Thomas J. Lynch, Mark S. Ross
Demonstration Of A Heat-Stable Cyclic Gmp Phosphodiesterase In The Medium Of Physarum Flavicomum, Thomas J. Lynch, Mark S. Ross
Journal of the Arkansas Academy of Science
No abstract provided.