Open Access. Powered by Scholars. Published by Universities.®

Biology Commons™

Open Access. Powered by Scholars. Published by Universities.®

Biological Sciences Faculty Publications

Discipline
Institution
Keyword
Publication Year
File Type

Articles 1141 - 1156 of 1156

Full-Text Articles in Biology

Larval Specialization And Phenotypic Variation In Arctopsyche-Grandis (Trichoptera, Hydropsychidae), F. Richard Hauer, Jack Arthur Stanford Jan 1981

Larval Specialization And Phenotypic Variation In Arctopsyche-Grandis (Trichoptera, Hydropsychidae), F. Richard Hauer, Jack Arthur Stanford

Biological Sciences Faculty Publications

Life history, trophic dynamics, abundance, and microdistribution of Arctopsyche grandis (Banks) were investigated in the Flathead River Basin, Montana. Two morphologically and ecological distinct larvae (Type I, with a head stripe and Type II, without a head stripe) were found throughout the drainage except in lower order streams. Type II larvae grew more rapidly and attained a larger size in final instar than Type I larvae. In areas where A. grandis biomass was greatest, Type I larvae were >10 times as abundant as Type II larvae. Type II larvae selected microhabitats characterized by larger interstitial spaces; Type I larvae were …

Go to article

Attributes Of Dispersing Meadow Voles In Open-Grid Populations, Raymond D. Dueser, Marcia L. Wilson, Robert K. Rose Jan 1981

Attributes Of Dispersing Meadow Voles In Open-Grid Populations, Raymond D. Dueser, Marcia L. Wilson, Robert K. Rose

Biological Sciences Faculty Publications

Dispersal was investigated in two open-grid populations of meadow voles, Microtus pennsylvanicus (Ord, 1815) an central Virginia (U.S.A.) from November 1974 to April 1978. "Dispersal" was defined as immigration onto open, occupied population grids. Dispersers were distinguished from residents by weight at first capture. Individuals first captured at weights <30 g were classified as residents; those first captured at >30 g were classified as dispersers. Three independent lines of evidence support the validity of the 30-g criterion for recognizing dispersers in these vole populations. With frequent trapping and high trappability, particularly of young animals, this open-grid method of study offers two advantages in the study of dispersal. First, dispersers identified …

Go to article

Subunit Interactions And The Allosteric Response In Phosphorylase, S. Sprang, R. J. Fletterick Jan 1980

Subunit Interactions And The Allosteric Response In Phosphorylase, S. Sprang, R. J. Fletterick

Biological Sciences Faculty Publications

The contribution of intersubunit interactions to allosterically induced conformational changes in phosphorylase are considered. Phosphorylase a, Pa (phosphorylated at Ser-14), is significantly in the active (R) conformation, while phosphorylase b, Pb (nonphosphorylated), is predominantly in the inactive (T) conformation. The structure of glucose-inhibited (T) Pa has been determined at 2.5-A resolution and atomic coordinates have been measured. These data have been used to calculate the solvent accessible surface area at the subunit interface and map noncovalent interactions between protomers. The subunit contact involves only 6% of the Pa monomer surface, but withdraws an area of 4,600 A2 from solvent. The …

Go to article

Phytoplankton Studies Within The Virginia Barrier Islands I. Seasonal Study Of Phytoplankton In Goose Lake, Parramore Island, Harold G. Marshall Jan 1980

Phytoplankton Studies Within The Virginia Barrier Islands I. Seasonal Study Of Phytoplankton In Goose Lake, Parramore Island, Harold G. Marshall

Biological Sciences Faculty Publications

The phytoplankton of Goose Lake, an oligohaline lake on Parramore Island, was studied for one year. The populations consisted primarily of ultraplankton and nanoplankton-sized forms with diatoms and chlorophyceans dominant most of the year. A general pattern of seasonally higher cell concentrations in early summer and fall was noted, with an unidentified ultraplankton-sized component prominent throughout the collection period. A list of 154 species is given.

Go to article

The Structure Of Glycogen Phosphorylase A At 2.5 Å Resolution, Stephen Sprang, Robert J. Fletterick Jul 1979

The Structure Of Glycogen Phosphorylase A At 2.5 Å Resolution, Stephen Sprang, Robert J. Fletterick

Biological Sciences Faculty Publications

The structure of the glucose-inhibited form of glycogen phosphorylase a has been determined at a resolution of 2.5 Å. With the aid of the primary sequence derived by Titani et al. (1977) for this enzyme, we have constructed an atomic model of the 97,400 molecular weight monomer. A substantial improvement in the electron density map over that reported previously (Fletterick et al., 1976b) was achieved by extension of the data set to 2.5 Å and the inclusion of three additional "heavy-atom" derivatives in the phasing procedure. Main-chain and side-chain electron density are clearly resolved in the map, allowing an unambiguous …

Go to article

The Reproductive Cycle Of Microtus Ochrogaster In Eastern Kansas, Robert K. Rose, Michael S. Gaines Jan 1978

The Reproductive Cycle Of Microtus Ochrogaster In Eastern Kansas, Robert K. Rose, Michael S. Gaines

Biological Sciences Faculty Publications

About 800 Microtus ochrogaster were live—trapped at biweekly intervals from May 1971 through March 1973 in 3 grassland study areas in eastern Kansas, USA. Details of reproduction were determined by autopsy. Population density increased through the first winter, reached a peak in April 1972, then declined sharply during that summer and beyond. Body length, but not body mass, tended to be positively related to density. Both sexes matured at about the same weight; development was somewhat prolonged during the winter months, especially in the winter preceding the population peak. Pregnancy rates were high, approaching maximal iteroparity, throughout the study, with …

Go to article

Isoenzyme Loci In Brown Trout (Salmo Trutta L.) - Detection And Interpretation From Population Data, Fred W. Allendorf, N. Mitchell, N. Ryman, G. Stahl Jan 1977

Isoenzyme Loci In Brown Trout (Salmo Trutta L.) - Detection And Interpretation From Population Data, Fred W. Allendorf, N. Mitchell, N. Ryman, G. Stahl

Biological Sciences Faculty Publications

Previously reported results on natural populations of brown trout (Salmo trutta L.) urged further studies using additional electrophoretically detectable loci. Samples of brain, eye, heart, kidney, liver, and muscle from approximately 50 specimens from each of two populations and a large number of muscle samples from several additional populations were examined. Electrophoretic and staining methods for the 37 enzymes studied are given in detail. Of a total of 69 loci detected, 54 loci were considered usable in population genetics screenings. The expression of the loci coding for these enzymes is described and interpreted. The results presented will serve as …

Go to article

On The Sedimentation Behavior And Molecular Weight Of 16s Ribosomal Rna From Escherichia Coli, Walter E. Hill, Kenneth R. Bakke, Donald P. Blair Jan 1977

On The Sedimentation Behavior And Molecular Weight Of 16s Ribosomal Rna From Escherichia Coli, Walter E. Hill, Kenneth R. Bakke, Donald P. Blair

Biological Sciences Faculty Publications

No abstract provided.

Go to article

Live Trap Preference Among Grassland Mammals, Robert K. Rose, Norman A. Slade, James H. Honacki Jan 1977

Live Trap Preference Among Grassland Mammals, Robert K. Rose, Norman A. Slade, James H. Honacki

Biological Sciences Faculty Publications

In two independent studies, small mammals of grassland communities in eastern Kansas, when given a choice, preferred Fitch to Sherman live traps. Except for the harvest mice in the demographic study, the type of preferred trap and magnitude of selection was remarkably comparable, with microtines showing slight, and cricetines strong, preferences overall. The merits of each type of trap are compared, and related to season, weather, prior experience, and trap-associated mortality.

Go to article

Genetic Variation In Scandinavian Brown Trout (Salmo Trutta L.): Evidence Of Distinct Sympatric Populations, Fred W. Allendorf, Nils Ryman, A. Stennek, G. Stahl Jan 1976

Genetic Variation In Scandinavian Brown Trout (Salmo Trutta L.): Evidence Of Distinct Sympatric Populations, Fred W. Allendorf, Nils Ryman, A. Stennek, G. Stahl

Biological Sciences Faculty Publications

Large differences in certain morphological traits between populations of brown trout (Salmo trutfa L.) in the lakes of northern Sweden led us to initiate an electrophoretic examination in an effort to understand the genetic structure of these populations. A total of 549 brown trout from four lakes were examined at 10 electrophoretically detected loci. Genetic variation was found at only three loci, coding for lactate dehydrogenase (LDH), alpha-glycerophosphate dehydrogenase (AGP), and creatine phosphokinase (CPK). A total absence of heterozygotes at the LDH-I locus in Lake Bunnersjoarna, coupled with significant correlations between LDH-I type and both CPK-I allele frequencies and …

Go to article

Gene Duplication In The Family Salmonidae 111. Linkage Between Two Duplicated Loci Coding For Aspartate Aminotransferase In The Cutthroat Trout (Salmo Clarki), Fred W. Allendorf, Fred M. Utter Jan 1976

Gene Duplication In The Family Salmonidae 111. Linkage Between Two Duplicated Loci Coding For Aspartate Aminotransferase In The Cutthroat Trout (Salmo Clarki), Fred W. Allendorf, Fred M. Utter

Biological Sciences Faculty Publications

The genetic control of the supernatant form of aspartate aminotransferase (AAT) was studied in the cutthroat trout (Salmo clarki) through a series of experimental matings. 509 individuals of eight families were examined to determine (1) the number of loci, (2) the mode of inheritance (i.e. disomic or tetrasomic), and (3) the linkage relationship of the loci involved. The variation observed is controlled by a duplicated locus resulting from a presumed tetraploid event of an ancestral salmonid. The inheritance experiments revealed .the presence of two disomic loci rather than a single tetrasomic locus. indicating that disomy has been reestablished …

Go to article

Population Dynamics Of Microtus Ochrogaster In Eastern Kansas, Michael S. Gaines, Robert K. Rose Jan 1976

Population Dynamics Of Microtus Ochrogaster In Eastern Kansas, Michael S. Gaines, Robert K. Rose

Biological Sciences Faculty Publications

Four eastern Kansas populations of the prairie vole, Microtus ochrogaster were live trapped from 1970—73 to gain insight into the population regulation of this species. All four populations exhibited a 2—yr cycle in numbers with peak densities generally occurring in June 1972. Peak densities were followed by a decline in numbers, a recovery, and a population crash in spring 1973. Reproductive parameters changed dramatically as density rose and fell. The summer breeding season in the crash year of 1973 was shortened by at least 3 mo. A reduction in breeding activity occurred during the summer of every year of the …

Go to article

Delayed-Hypersensitivity Reactions Provoked By Ribosomes From Acid-Fast Bacilli - Physical Characteristics And Immunological Aspects Of Core Ribosomal-Proteins From Mycobacterium-Smegmatis, R. V. Loge, Walter E. Hill, Robert E. Baker, C. L. Larson Jan 1974

Delayed-Hypersensitivity Reactions Provoked By Ribosomes From Acid-Fast Bacilli - Physical Characteristics And Immunological Aspects Of Core Ribosomal-Proteins From Mycobacterium-Smegmatis, R. V. Loge, Walter E. Hill, Robert E. Baker, C. L. Larson

Biological Sciences Faculty Publications

No abstract provided.

Go to article

Ribosomes Of Acid-Fast Bacilli - Immunogenicity, Serology, And In-Vitro Correlates Of Delayed-Hypersensitivity, Robert E. Baker, Walter E. Hill, C. L. Larson Jan 1973

Ribosomes Of Acid-Fast Bacilli - Immunogenicity, Serology, And In-Vitro Correlates Of Delayed-Hypersensitivity, Robert E. Baker, Walter E. Hill, C. L. Larson

Biological Sciences Faculty Publications

No abstract provided.

Go to article

Resistance Of Mice To Infection With Friend Disease Virus After Subcutaneous Injection Of Friend Virus And Friend Spleen-Cells, C. L. Larson, R. N. Ushijima, S. K. Kasuga, Robert E. Baker, M. B. Baker Jan 1973

Resistance Of Mice To Infection With Friend Disease Virus After Subcutaneous Injection Of Friend Virus And Friend Spleen-Cells, C. L. Larson, R. N. Ushijima, S. K. Kasuga, Robert E. Baker, M. B. Baker

Biological Sciences Faculty Publications

No abstract provided.

Go to article

Succession In A Dune Community At Mentor Headlands, Ohio, Harold G. Marshall Jan 1955

Succession In A Dune Community At Mentor Headlands, Ohio, Harold G. Marshall

Biological Sciences Faculty Publications

Continual sand deposition on the Lake Erie shore, adjacent to the mouth of the Grand River, has led to the formation of a developing sand dune community and through the years a successional pattern of plant growth. An analysis was made of the general plant composition of the area by means of four transects directed from the bare beach inland. Definite zonation of specific plant species was present throughout the community in parallel formation. Named for the dominant plant types they contained, the major stages were: dune grass, poplar, aspen, and oak.

Go to article

First Prev