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

Digital Commons Network™

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

2001

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 6541 - 6570 of 8289

Full-Text Articles in Entire DC Network

The Genetics Of Reproductive Isolation And The Potential For Gene Exchange Between Drosophila Pseudoobscura And D. Persimilis Via Backcross Hybrid Males, Mohamed A.F. Noor, Katherine L. Grams, Lisa A. Bertucci, Yvette Almendarez, Jane Reiland, Kelley R. Smith Jan 2001

The Genetics Of Reproductive Isolation And The Potential For Gene Exchange Between Drosophila Pseudoobscura And D. Persimilis Via Backcross Hybrid Males, Mohamed A.F. Noor, Katherine L. Grams, Lisa A. Bertucci, Yvette Almendarez, Jane Reiland, Kelley R. Smith

Faculty Publications

Hybrid male sterility, hybrid inviability, sexual isolation, and a hybrid male courtship dysfunction reproductively isolate Drosophila pseudoobscura and D. persimilis. Previous studies of the genetic bases of these isolating mechanisms have yielded only limited information about how much and what areas of the genome are susceptible to interspecies introgression. We have examined the genetic basis of these barriers to gene exchange in several thousand backcross hybrid male progeny of these species using 14 codominant molecular genetic markers spanning the five chromosomes of these species, focusing particularly on the autosomes. Hybrid male sterility, hybrid inviability, and the hybrid male courtship dysfunction …

Go to article

Estimating The Unbiased Estimator Θ For Population Genetic Survey Data, Jacqueline J. Weicker, Robb T. Brumfield, Kevin Winker Jan 2001

Estimating The Unbiased Estimator Θ For Population Genetic Survey Data, Jacqueline J. Weicker, Robb T. Brumfield, Kevin Winker

Faculty Publications

We consider a method of approximating Weir and Cockerham's θ, an unbiased estimator of genetic population structure, using values readily available from published studies using biased estimators (Wright's FST or Nei's GST). The estimation algorithm is shown to be useful for both model populations and real-world avian populations. However, the correlation between Wright's FST and Weir and Cockerham's θ is strong when compared among 39 empirical avian datasets. Thus, the advantage of approximating an unbiased estimator is unclear considering the small actual effect of θ's bias-removing power on empirical datasets.

Go to article

Evolutionary Implications Of Divergent Clines In An Avian (Manacus: Aves) Hybrid Zone, Robb T. Brumfield, Robert W. Jernigan, David B. Mcdonald, Michael J. Braun Jan 2001

Evolutionary Implications Of Divergent Clines In An Avian (Manacus: Aves) Hybrid Zone, Robb T. Brumfield, Robert W. Jernigan, David B. Mcdonald, Michael J. Braun

Faculty Publications

A previous study of the hybrid zone in western Panama between white-collared (Manacus candei) and golden-collared manakins (M. vitellinus) documented the unidirectional introgression of vitellinus male secondary sexual traits across the zone. Here, we examine the hybrid zone in greater genetic and morphological detail. Statistical comparisons of clines are performed using maximum-likelihood and nonparametric bootstrap methods. Our results demonstrate that an array of six molecular and two morphometric markers agree in cline position and width. Clines for male collar and belly color are similar in width to the first eight clines, but are shifted in position by at least five …

Go to article

Sexual Selection On Plumage And Behavior In An Avian Hybrid Zone: Experimental Tests Of Male-Male Interactions, David B. Mcdonald, Robert P. Clay, Robb T. Brumfield, Michael J. Braun Jan 2001

Sexual Selection On Plumage And Behavior In An Avian Hybrid Zone: Experimental Tests Of Male-Male Interactions, David B. Mcdonald, Robert P. Clay, Robb T. Brumfield, Michael J. Braun

Faculty Publications

In western Panama, an unusual hybrid zone exists between white-collared manakins, Manacus candei, and golden-collared manakins, M. vitellinus. Unidirectional introgression of plumage traits from vitellinus into candei has created a region in which all definitively plumaged males have a collar that is lemon-colored. These males are nearly indistinguishable from white-collared candei genetically and morphometrically, but strongly resemble golden-collared vitellinus due to the introgression of secondary sexual plumage traits, particularly the lemon-colored collar. The introgression could be explained by sexual selection for golden-collared traits or by a series of mechanisms that do not invoke sexual selection (e.g., neutral diffusion, dominant allele). …

Go to article

Membrane Lipid Biosynthesis In Chlamydomonas Reinhardtii. In Vitro Biosynthesis Of Diacylglyceryltrimethylhomoserine, T. S. Moore, Z. Du, Z. Chen Jan 2001

Membrane Lipid Biosynthesis In Chlamydomonas Reinhardtii. In Vitro Biosynthesis Of Diacylglyceryltrimethylhomoserine, T. S. Moore, Z. Du, Z. Chen

Faculty Publications

Diacylglyceryltrimethylhomo-Ser (DGTS) is an abundant lipid in the membranes of many algae, lower plants, and fungi. It commonly has an inverse concentration relationship with phosphatidylcholine, thus seemingly capable of replacing this phospholipid in these organisms. In some places this replacement is complete; Chlamydomonas reinhardtii is such an organism, and was used for these investigations. We have assayed headgroup incorporation to form DGTS in vitro. The precursor for both the homo-Ser moiety and the methyl groups was found to be S-adenosyl-L-Met. DGTS formation was associated with microsomal fractions and is not in plastids. By analogy with phosphatidylcholine and phosphatidylethanolamine biosynthesis in …

Go to article

Sweetpotato Periderm Components Inhibit In Vitro Growth Of Root Rotting Fungi, Jr Harrison, J. K. Peterson, C. A. Clark, M. E. Snook Jan 2001

Sweetpotato Periderm Components Inhibit In Vitro Growth Of Root Rotting Fungi, Jr Harrison, J. K. Peterson, C. A. Clark, M. E. Snook

Faculty Publications

Sweetpotato [Ipomoea batatas (L.) Lam.] periderm components were tested for their effect on four fungi that infect sweetpotato roots: Fusarium oxysporum Schlecht. f. sp. batatas (Wollenw.) Snyd. & Hans. and F. solani (Sacc.) Mart., both of which cause stem and root disease; and Lasiodiplodea theobromae (Pat.) Griffon & Maubl. and Rhizopus stolonifer (Ehr. ex Fr.) Lind., both of which cause storage root disease. Sequential extracts of 'Regal' sweetpotato periderm with hexane, methanol, and 50% methanol were inhibitory to the four fungi when incorporated into potato dextrose agar medium in petri dish bioassays. The methanol and 50% methanol extracts were much …

Go to article

Effect Of Commercial Fat Replacers On The Microstructure Of Low-Fat Cheddar Cheese, Kayanush J. Aryana, Zahur U. Haque Jan 2001

Effect Of Commercial Fat Replacers On The Microstructure Of Low-Fat Cheddar Cheese, Kayanush J. Aryana, Zahur U. Haque

Faculty Publications

This objective of this study was to determine the effect of protein-and carbohydrate-based fat replacers on the microstructure of low-fat Cheddar cheese. Microstructure was studied by transmission and scanning electron microscopy. Protein-based fat replacers were Dairy LoTM (DL) and SimplesseTM (SIMP), while the carbohydrate-based fat replacers were NovagelTM (NOV) and StellarTM (STEL). Low-fat Cheddar cheese was manufactured using these commercial fat replacers and aged for 6 months at 5 °C. Low-fat control (LFC) and low-fat Cheddar cheese made with SIMP and DL showed a rippled surface microstructure while incorporation of NOV and STEL resulted in cheese with an undulated and …

Go to article

Linkage And Association Analysis Of Angiotensin I-Converting Enzyme (Ace)-Gene Polymorphisms With Ace Concentration And Blood Pressure, Xiaofeng Zhu, Nourdine Bouzekri, Lorraine Southam, Richard S. Cooper, Adebowale Adeyemo, Colin A. Mckenzie, Amy Luke, Guangjie Chen, Robert C. Elston, Ryk Ward Jan 2001

Linkage And Association Analysis Of Angiotensin I-Converting Enzyme (Ace)-Gene Polymorphisms With Ace Concentration And Blood Pressure, Xiaofeng Zhu, Nourdine Bouzekri, Lorraine Southam, Richard S. Cooper, Adebowale Adeyemo, Colin A. Mckenzie, Amy Luke, Guangjie Chen, Robert C. Elston, Ryk Ward

Faculty Publications

Considerable effort has been expended to determine whether the gene for angiotensin I-converting enzyme (ACE) confers susceptibility to cardiovascular disease. In this study, we genotyped 13 polymorphisms in the ACE gene in 1,343 Nigerians from 332 families. To localize the genetic effect, we first performed linkage and association analysis of all the markers with ACE concentration. In multipoint variance-component analysis, this region was strongly linked to ACE concentration (maximum LOD score 7.5). Likewise, most of the polymorphisms in the ACE gene were significantly associated with ACE (P < .0013). The two most highly associated polymorphisms, ACE4 and ACE8, accounted for 6% and 19% of the variance in ACE, respectively. A two-locus additive model with an additive x additive interaction of these polymorphisms explained most of the ACE variation associated with this region. We next analyzed the relationship between these two polymorphisms (ACE4 and ACE8) and blood pressure (BP). Although no evidence of linkage was detected, significant association was found for both systolic and diastolic BP when a two-locus additive model developed for ACE concentration was used. Further analyses demonstrated that an epistasis model provided the best fit to the BP variation. In conclusion, we found that the two polymorphisms explaining the greatest variation in ACE concentration are significantly associated with BP, through interaction, in this African population sample. Our study also demonstrates that greater statistical power can be anticipated with association analysis versus linkage, when markers in strong linkage disequilibrium with a trait locus have been identified. Furthermore, alllelic interaction may play an important role in the dissection of complex traits such as BP.

Go to article

Effect Of Sweetpotato Genotype, Storage Time And Production Site On Feeding And Oviposition Behavior Of The Sweetpotato Weevil, Cylas Formicarius (Coleoptera: Apoinidae), L. Mao, R. N. Story, A. M. Hammond, D. R. Labonte Jan 2001

Effect Of Sweetpotato Genotype, Storage Time And Production Site On Feeding And Oviposition Behavior Of The Sweetpotato Weevil, Cylas Formicarius (Coleoptera: Apoinidae), L. Mao, R. N. Story, A. M. Hammond, D. R. Labonte

Faculty Publications

The effect of sweetpotato genotype, storage time and production site on Cylas formicarius (Fab.) feeding and oviposition was investigated. Sweetpotato genotype had a significant effect on feeding and oviposition rates in both no-choice and choice arenas. Beauregard and Centennial were uniformly susceptible across all age groups. W-250 had the least number of feeding punctures and eggs at 7 and 25 days after harvest. At 85 days after harvest, W-244 had the least number of feeding punctures and eggs, while W-250 was not significantly different from Beauregard and Centennial. Roots of the same genotype grown in different locations differed in the …

Go to article

The Asymptotic Equivalence Of The Fisher Information Matrices For Type I And Type Ii Censored Data From Location-Scale Families, Luis A. Escobar, William Q. Meeker Jan 2001

The Asymptotic Equivalence Of The Fisher Information Matrices For Type I And Type Ii Censored Data From Location-Scale Families, Luis A. Escobar, William Q. Meeker

Faculty Publications

Type I and Type II censored data arise frequently in controlled laboratory studies concerning time to a particular event (e.g., death of an animal or failure of a physical device). Log-location-scale distributions (e.g., Weibull, log-normal, and loglogistic) are commonly used to model the resulting data. Maximum likelihood (ML) is generally used to obtain parameter estimates when the data are censored. The Fisher information matrix can be used to obtain large-sample approximate variances and covariances of the ML estimates or to estimate these variances and covariances from data. The derivations of the Fisher information matrix proceed differently for Type I (time …

Go to article

Similarity Is Relative: Hierarchy Of Genetic Similarities In The Formosan Subterranean Termite (Isoptera: Rhinotermitidae) In Hawaii, C. Husseneder, J. K. Grace Jan 2001

Similarity Is Relative: Hierarchy Of Genetic Similarities In The Formosan Subterranean Termite (Isoptera: Rhinotermitidae) In Hawaii, C. Husseneder, J. K. Grace

Faculty Publications

Termites (Isoptera) have a strong hierarchical structure due to their social organization. To interpret genetic differences within and among termite populations it is first necessary to create a quantitative scale to determine the meaning of "different." To accomplish this, the entire hierarchy of genetic similarities in a Hawaiian population of Coptotermes formosanus Shiraki (Isoptera: Rhinotermitidae) was defined by multilocus DNA fingerprinting using the oligonucleotide (GTG)5 as a probe. The genetic background similarity in the population, based on the genetic similarity between unrelated termites, was 0.21 and falls in the range of other natural invertebrate and vertebrate populations. The mean genetic …

Go to article

Seasonal Distribution And Parasitism Of Scapteriscus Spp. (Orthoptera: Gryllotalpidae) In Southeastern Louisiana, D. C. Henne, S. J. Johnson Jan 2001

Seasonal Distribution And Parasitism Of Scapteriscus Spp. (Orthoptera: Gryllotalpidae) In Southeastern Louisiana, D. C. Henne, S. J. Johnson

Faculty Publications

Mole crickets of the genus Scapteriscus were accidentally introduced into the southern United States almost a century ago and are considered to be economically important pests in southern U.S. regions. Mole crickets were sampled using acoustic traps in Baton Rouge and New Orleans, Louisiana in the fall of 1998, the spring and fall of 1999, and the spring of 2000. In southeastern Louisiana Scapteriscus borellii has a seasonal flight period starting in late February and continuing into June. A lesser flight period occurs in the fall, starting in mid-September and continuing into November. S. vicinus was captured only from late …

Go to article

Lsu General Catalog 2001-2002, Louisiana State University And Agricultural And Mechanical College Jan 2001

Lsu General Catalog 2001-2002, Louisiana State University And Agricultural And Mechanical College

LSU General Catalog

The LSU General Catalog describes all undergraduate and graduate departments and programs with degree requirements and courses offered for each one. The General Catalog includes information on registration and financial aid as well as academic services offered to all students.

Go to article

Selection, Egg Viability, And Fecundity Of The Sugarcane Borer (Lepidoptera: Crambidae) With Tebufenozide, L. M. Rodriguez, J. A. Ottea, T. E. Reagan Jan 2001

Selection, Egg Viability, And Fecundity Of The Sugarcane Borer (Lepidoptera: Crambidae) With Tebufenozide, L. M. Rodriguez, J. A. Ottea, T. E. Reagan

Faculty Publications

Two separate attempts to select the sugarcane borer, Diatraea saccharalis (F.), for resistance to tebufenozide were unsuccessful. Both selected colonies were lost after the fourth generation due to a lack of oviposition. Differences were not detected in fecundity or percent egg viability for 5-d-old third instars exposed to concentrations (EC5, EC15, and EC30) of tebufenozide for 7 d. Decreases (P ≤ 0.01) in mean female pupal weights were detected in larvae exposed to EC15 and EC30 concentrations. An ovicidal impact using serial dilutions of tebufenozide (10, 100, and 200 ppm) also was detected. Percent viability was reduced from 98% for …

Go to article

Greeks, Indians, And The Scotticsh Presbyterian Dissident Arguments For Vegetarianism In Enlightenment Scotland, David Allen Jan 2001

Greeks, Indians, And The Scotticsh Presbyterian Dissident Arguments For Vegetarianism In Enlightenment Scotland, David Allen

1650-1850: Ideas, Aesthetics, and Inquiries in the Early Modern Era

No abstract provided.

Go to article

Book Reviews Jan 2001

Book Reviews

1650-1850: Ideas, Aesthetics, and Inquiries in the Early Modern Era

No abstract provided.

Go to article

In The Interest Of Justice: Granting Post-Conviction Deoxyribonucleic Acid (Dna) Testing To Inmates, Jennifer Boemer Jan 2001

In The Interest Of Justice: Granting Post-Conviction Deoxyribonucleic Acid (Dna) Testing To Inmates, Jennifer Boemer

William Mitchell Law Review

No abstract provided.

Go to article

A Muckraker's Aftermath: The Jungle Of Meat-Packing Regulation After A Century, Roger I. Roots Jan 2001

A Muckraker's Aftermath: The Jungle Of Meat-Packing Regulation After A Century, Roger I. Roots

William Mitchell Law Review

No abstract provided.

Go to article

Problems With Richard Posner's The Problematics Of Moral And Legal Theory, Ryan Fortson Jan 2001

Problems With Richard Posner's The Problematics Of Moral And Legal Theory, Ryan Fortson

William Mitchell Law Review

No abstract provided.

Go to article

Moving Toward A First-Best World: Minnesota's Position On Multiethnic Adoptions, Margaret F. Brinig Jan 2001

Moving Toward A First-Best World: Minnesota's Position On Multiethnic Adoptions, Margaret F. Brinig

William Mitchell Law Review

No abstract provided.

Go to article

Reforming The System To Protect Children In High Conflict Custody Cases, Linda D. Elrod Jan 2001

Reforming The System To Protect Children In High Conflict Custody Cases, Linda D. Elrod

William Mitchell Law Review

No abstract provided.

Go to article

Race, Poverty, And Neglect, Andrea Charlow Jan 2001

Race, Poverty, And Neglect, Andrea Charlow

William Mitchell Law Review

No abstract provided.

Go to article

Do We Know What We Think We Know About Winter Ranges Of Migrants To South America? The Case Of The Veery (Catharus Fuscescens), P. C. Stouffer Jan 2001

Do We Know What We Think We Know About Winter Ranges Of Migrants To South America? The Case Of The Veery (Catharus Fuscescens), P. C. Stouffer

Faculty Publications

No abstract provided.

Go to article

Differential Detection Of Bartonella Species And Strains In Cat Scratch Disease Diagnostics By Polymerase Chain Reaction Amplification Of 16s Ribosomal Rna Gene, Ronald A. Tapp, Alma F. Roy, Richard E. Corstvet, Vincent L. Wilson Jan 2001

Differential Detection Of Bartonella Species And Strains In Cat Scratch Disease Diagnostics By Polymerase Chain Reaction Amplification Of 16s Ribosomal Rna Gene, Ronald A. Tapp, Alma F. Roy, Richard E. Corstvet, Vincent L. Wilson

Faculty Publications

Cat scratch disease (CSD) has been difficult to diagnose in animals because of the protracted clinical course of infection and the quiescent phases when the microbial culprit lies dormant. The causative agent in CSD appears to be multiple species and strains of Bartonella. Using polymerase chain reaction (PCR) techniques for amplification of highly variable regions of the 16S ribosomal RNA (rRNA) gene sequence, a very sensitive species- and strain-specific assay for CSD-causing Bartonella species was developed. PCR primers were designed to specifically amplify the 16S rRNA gene of Bartonella species but not of other microbial pathogens. This initial PCR was …

Go to article

Crocodile Hunter, Jim Stewart '76 Jan 2001

Crocodile Hunter, Jim Stewart '76

Furman Magazine

For researcher Thomas Rainwater, catching crocs is all in a day's work.

Go to article

Furman Magazine. Volume 43, Issue 4 - Full Issue, Furman University Jan 2001

Furman Magazine. Volume 43, Issue 4 - Full Issue, Furman University

Furman Magazine

No abstract provided.

Go to article

The Prefab Days, Judith Babb Chandler '66 Jan 2001

The Prefab Days, Judith Babb Chandler '66

Furman Magazine

The years immediately following World War II were a special time to be young and part of a select campus community.

Go to article

Furman Alumni News, Furman University Jan 2001

Furman Alumni News, Furman University

Furman Magazine

No abstract provided.

Go to article

Co-Involvement Of Mitochondria And Endoplasmic Reticulum In Regulation Of Apoptosis: Changes In Cytochrome C, Bcl-2 And Bax In The Hippocampus Of Aluminum-Treated Rabbits, David A. Dewitt, Othman Ghribi, Michael S. Forbes, Mary M. Herman, John Savory Jan 2001

Co-Involvement Of Mitochondria And Endoplasmic Reticulum In Regulation Of Apoptosis: Changes In Cytochrome C, Bcl-2 And Bax In The Hippocampus Of Aluminum-Treated Rabbits, David A. Dewitt, Othman Ghribi, Michael S. Forbes, Mary M. Herman, John Savory

Faculty Publications and Presentations

Neurodegenerative diseases, including Alzheimer’s disease, are characterized by a progressive and selective loss of neurons. Apoptosis under mitochondrial control has been implicated in this neuronal death process, involving the release of cytochrome c into the cytoplasm and initiation of the apoptosis cascade. However, a growing body of evidence suggests an active role for the endoplasmic reticulum in regulating apoptosis, either independent of mitochondrial, or in concert with mitochondrial-initiated pathways. Members of the Bcl-2 family of proteins have been shown to either inhibit apoptosis, as is the case with Bcl-2, or to promote it, in the case of Bax. Investigations in …

Go to article

Maintaining Social Justice Hopes Within Academic Realities: A Freirean Approach To Critical Race/Latcrit Pedagogy, Daniel G. Solorzano, Tara J. Yosso Jan 2001

Maintaining Social Justice Hopes Within Academic Realities: A Freirean Approach To Critical Race/Latcrit Pedagogy, Daniel G. Solorzano, Tara J. Yosso

Denver Law Review

No abstract provided.

Go to article

First Prev Next Last