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1998

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Articles 1 - 30 of 2159

Full-Text Articles in Life Sciences

Absorption Efficiencies And Biochemical Fractionation Of Assimilated Compounds In The Cold Water Appendicularian Oikopleura Vanhoeffeni, Alexander B. Bochdansky, Don Deibel, Richard B. Rivkin Dec 1998

Absorption Efficiencies And Biochemical Fractionation Of Assimilated Compounds In The Cold Water Appendicularian Oikopleura Vanhoeffeni, Alexander B. Bochdansky, Don Deibel, Richard B. Rivkin

OEAS Faculty Publications

Using Ge-68:C-14 dual-labeling, we investigated the absorption efficiency of diatom carbon for the cold water appendicularian Oikopleura vanhoeffeni. The absorption efficiency of bulk carbon (mean = 67%) was not influenced by body size or ingestion rate. For the first time for a pelagic tunicate, food and feces were fractionated into their major biochemical constituents (i.e., low-molecular-weight compounds, lipid, protein, and polysaccharide), allowing calculation of absorption efficiencies for each fraction. Low-molecular-weight compounds and proteins were preferentially absorbed over lipids and polysaccharides. However, predicted C:N ratios of the fecal pellets of O. vanhoeffeni were in the lower range of C ...


Functional Analysis Of Tpr: Identification Of Nuclear Pore Complex Association And Nuclear Localization Domains And A Role In Mrna Export, Peter Lawrence Bangs, Brian Burke, Christine M. Powers, Roger W. Craig, Aruna Purohit, Stephen J. Doxsey Dec 1998

Functional Analysis Of Tpr: Identification Of Nuclear Pore Complex Association And Nuclear Localization Domains And A Role In Mrna Export, Peter Lawrence Bangs, Brian Burke, Christine M. Powers, Roger W. Craig, Aruna Purohit, Stephen J. Doxsey

Open Access Articles

Tpr is a 270-kD coiled-coil protein localized to intranuclear filaments of the nuclear pore complex (NPC). The mechanism by which Tpr contributes to the structure and function of the nuclear pore is currently unknown. To gain insight into Tpr function, we expressed the full-length protein and several subdomains in mammalian cell lines and examined their effects on nuclear pore function. Through this analysis, we identified an NH2-terminal domain that was sufficient for association with the nucleoplasmic aspect of the NPC. In addition, we unexpectedly found that the acidic COOH terminus was efficiently transported into the nuclear interior, an event that ...


Drosophila Fascin Mutants Are Rescued By Overexpression Of The Villin-Like Protein, Quail, Kelly Cant, Brenda A. Knowles, Shalina Mahajan-Miklos, Matthew Heintzelman, Lynn Cooley Dec 1998

Drosophila Fascin Mutants Are Rescued By Overexpression Of The Villin-Like Protein, Quail, Kelly Cant, Brenda A. Knowles, Shalina Mahajan-Miklos, Matthew Heintzelman, Lynn Cooley

Open Dartmouth: Faculty Open Access Articles

Actin bundle assembly in specialized structures such as microvilli on intestinal epithelia and Drosophila bristles requires two actin bundling proteins. In these systems, the distinct biochemical properties and temporal localization of actin bundling proteins suggest that these proteins are not redundant. During Drosophila oogenesis, the formation of cytoplasmic actin bundles in nurse cells requires two actin bundling proteins, fascin encoded by the singed gene and a villin-like protein encoded by the quail gene. singed and quail mutations are fully recessive and each mutation disrupts nurse cell cytoplasmic actin bundle formation. We used P-element mediated germline transformation to overexpress quail in ...


Index To Volume 9, Nos. 1-24, Agricultural Law Digest Dec 1998

Index To Volume 9, Nos. 1-24, Agricultural Law Digest

Agricultural Law Digest

No abstract provided.


Discount For Potential Capital Gains Tax Liability, Neil Harl Dec 1998

Discount For Potential Capital Gains Tax Liability, Neil Harl

Agricultural Law Digest

Although it has been well established for years that discounts could be claimed on corporate stock (and some other ownership interests) for minority interest and nonmarketability, the courts until this year have resisted efforts to obtain a deduction for potential capital gains tax liability. However, two 1998 cases have been responsible for a break-through and have allowed discounts for potential income tax liability from liquidation in valuing corporate stock. Both Eisenberg v. Commissioner, and Estate of Davis v. Commissioner, involved stock valuation for federal gift tax purposes.


Cases, Regulations And Statutes, Robert P. Achenbach Jr. Dec 1998

Cases, Regulations And Statutes, Robert P. Achenbach Jr.

Agricultural Law Digest

No abstract provided.


Release Of Camp Gating By The Alpha6beta4 Integrin Stimulates Lamellae Formation And The Chemotactic Migration Of Invasive Carcinoma Cells, Kathleen L. O'Connor, Leslie M. Shaw, Arthur M. Mercurio Dec 1998

Release Of Camp Gating By The Alpha6beta4 Integrin Stimulates Lamellae Formation And The Chemotactic Migration Of Invasive Carcinoma Cells, Kathleen L. O'Connor, Leslie M. Shaw, Arthur M. Mercurio

Cancer Biology Publications and Presentations

The alpha6beta4 integrin promotes carcinoma in-vasion by its activation of a phosphoinositide 3-OH (PI3-K) signaling pathway (Shaw, L.M., I. Rabinovitz, H.H.-F. Wang, A. Toker, and A.M. Mercurio. Cell. 91: 949-960). We demonstrate here using MDA-MB-435 breast carcinoma cells that alpha6beta4 stimulates chemotactic migration, a key component of invasion, but that it has no influence on haptotaxis. Stimulation of chemotaxis by alpha6beta4 expression was observed in response to either lysophosphatidic acid (LPA) or fibroblast conditioned medium. Moreover, the LPA-dependent formation of lamellae in these cells is dependent upon alpha6beta4 expression. Both lamellae formation and chemotactic migration are ...


Northeast Research Station Watertown, South Dakota Annual Progress Report, 1998, Agricultural Experiment Station, Plant Science Department Dec 1998

Northeast Research Station Watertown, South Dakota Annual Progress Report, 1998, Agricultural Experiment Station, Plant Science Department

Agricultural Experiment Station and Research Farm Annual Reports

This is the 1998 annual progress report for the Northeast Research Station in Watertown, South Dakota. This report is issued by the South Dakota Agricultural Experiment Station and the South Dakota State University Plant Science Department. This report includes information on the 1998 crop season, including: precipitation summary, small grain , corn, and soybean performance trials, flax and canola variety trials, spring and winter wheat breeding , soybean row space/population studies, performance of corn hybrids, corn yields, rotation studies and fungicide test.


Analysis Of Murine Cd8(+) T-Cell Clones Specific For The Dengue Virus Ns3 Protein: Flavivirus Cross-Reactivity And Influence Of Infecting Serotype, Anne C. Spaulding, Ichiro Kurane, Francis A. Ennis, Alan L. Rothman Dec 1998

Analysis Of Murine Cd8(+) T-Cell Clones Specific For The Dengue Virus Ns3 Protein: Flavivirus Cross-Reactivity And Influence Of Infecting Serotype, Anne C. Spaulding, Ichiro Kurane, Francis A. Ennis, Alan L. Rothman

Open Access Articles

Serotype-cross-reactive dengue virus-specific cytotoxic T lymphocytes (CTL) induced during a primary dengue virus infection are thought to play a role in the immunopathogenesis of dengue hemorrhagic fever (DHF) during a secondary dengue virus infection. Although there is no animal model of DHF, we previously reported that murine dengue virus-specific CTL responses are qualitatively similar to human dengue virus-specific CTL responses. We used BALB/c mice to study the specificity of the CTL response to an immunodominant epitope on the dengue virus NS3 protein. We mapped the minimal H-2Kd-restricted CTL epitope to residues 298 to 306 of the dengue type 2 ...


Interaction Of Zpr1 With Translation Elongation Factor-1alpha In Proliferating Cells, Laxman Gangwani, Monique Mikrut, Zoya Galcheva-Gargova, Roger J. Davis Dec 1998

Interaction Of Zpr1 With Translation Elongation Factor-1alpha In Proliferating Cells, Laxman Gangwani, Monique Mikrut, Zoya Galcheva-Gargova, Roger J. Davis

Open Access Articles

The zinc finger protein ZPR1 is present in the cytoplasm of quiescent mammalian cells and translocates to the nucleus upon treatment with mitogens, including epidermal growth factor (EGF). Homologues of ZPR1 were identified in yeast and mammals. These ZPR1 proteins bind to eukaryotic translation elongation factor-1alpha (eEF-1alpha). Studies of mammalian cells demonstrated that EGF treatment induces the interaction of ZPR1 with eEF-1alpha and the redistribution of both proteins to the nucleus. In the yeast Saccharomyces cerevisiae, genetic analysis demonstrated that ZPR1 is an essential gene. Deletion analysis demonstrated that the NH2-terminal region of ZPR1 is required for normal growth and ...


Dynamics Of Human Immunodeficiency Virus Type 1 Replication In Vertically Infected Infants, Katherine Luzuriaga, Hulin Wu, Margaret M. Mcmanus, Paula Britto, William Borkowsky, Sandra K. Burchett, Betsy Smith, Lynne M. Mofenson, John L. Sullivan Dec 1998

Dynamics Of Human Immunodeficiency Virus Type 1 Replication In Vertically Infected Infants, Katherine Luzuriaga, Hulin Wu, Margaret M. Mcmanus, Paula Britto, William Borkowsky, Sandra K. Burchett, Betsy Smith, Lynne M. Mofenson, John L. Sullivan

Open Access Articles

Plasma human immunodeficiency virus type 1 (HIV-1) turnover and kinetics were studied in children aged 15 days to 2 years following the initiation of a triple antiretroviral drug regimen consisting of zidovudine, lamivudine, and nevirapine. HIV-1 turnover was at least as rapid as that previously described in adults; turnover rates were more rapid in infants and children aged 3 months to 2 years than in infants less than 3 months of age. These data confirm the central role of HIV-1 replication in the pathogenesis of vertical HIV-1 infection and reinforce the importance of early, potent combination therapies for the long-term ...


Promotor (Flt) For The Full-Length Transcript Of Peanut Chlorotic Streak Caulimovirus (Pclsv) And Expression Of Chimeric Genes In Plants, Indu B. Maiti, Robert J. Shepherd Dec 1998

Promotor (Flt) For The Full-Length Transcript Of Peanut Chlorotic Streak Caulimovirus (Pclsv) And Expression Of Chimeric Genes In Plants, Indu B. Maiti, Robert J. Shepherd

Kentucky Tobacco Research and Development Center Faculty Patents

The isolation, modification and use of wild-type and modified viral FLt promoters of peanut chlorotic streak caulimovirus (PClSV) in the expression of chimeric genes in plant cells. The FLt promoter from PClSV has been modified to have duplicated enhancer domains.


Central Crops And Soils Research Station Highmore, South Dakota: Annual Progress Report, 1998, Agricultural Experiment Station Dec 1998

Central Crops And Soils Research Station Highmore, South Dakota: Annual Progress Report, 1998, Agricultural Experiment Station

Agricultural Experiment Station and Research Farm Annual Reports

This report of the Central Crops and Soils Research Station at Highmore, South Dakota is a progress report and, therefore, the results presented are not necessarily complete nor conclusive. Any interpretation given is tentative because additional data from continuation of these experiments may produce conclusions different from those of any one year. The data presented in this report reflect the 1998 growing season.


Endangered And Threatened Wildlife And Plants; Final Rule To List The Topeka Shiner As Endangered Dec 1998

Endangered And Threatened Wildlife And Plants; Final Rule To List The Topeka Shiner As Endangered

Endangered Species Bulletins and Technical Reports (USFWS)

The U.S. Fish and Wildlife Service determines the Topeka shiner (Notropis Topeka) to be an endangered species under the authority of the Endangered Species Act of 1973 (Act), as amended (16 U.S.C. 1531 et seq.). The Topeka shiner is a small fish presently known from small tributary streams in the Kansas and Cottonwood river basins in Kansas; the Missouri, Grand, Lamine, Chariton, and Des Moines river basins in Missouri; the North Raccoon and Rock river basins in Iowa; the James, Big Sioux and Vermillion river watersheds in South Dakota; and, the Rock and Big Sioux river watersheds ...


Soybean Designated Ax7017-1-3, Walter R. Fehr, Earl G. Hammond Dec 1998

Soybean Designated Ax7017-1-3, Walter R. Fehr, Earl G. Hammond

Iowa State University Patents

A soybean seed is provided which exhibits an extremely high level of palmitic acid within the vegetable oil component of the seed. The soybean seed is designated AX7017-1-3 and bears ATCC Accession No. 97967. Palmitic acid is present in the endogenously formed vegetable oil in a concentration of at least 18 percent by weight (preferably at least 20 percent by weight) based upon the total fatty acid content as determined by gas chromatography. Descendants which exhibit a comparable palmitic acid content within the vegetable of the present invention are included within the concept of the present invention. A soybean plant ...


Rhodospirillum Rubrum Poly-Β-Hydroxyalkanoate Synthase, Thomas E. Clemente, Ganish M. Kishore, Timothy A. Mitsky, David M. Stark Dec 1998

Rhodospirillum Rubrum Poly-Β-Hydroxyalkanoate Synthase, Thomas E. Clemente, Ganish M. Kishore, Timothy A. Mitsky, David M. Stark

Faculty Publications from the Center for Plant Science Innovation

Isolated DNA fragments encoding a Rhodospirillum rubrum (ATCC 25903) polyhydroxyalkanoate (PHA) synthase, or biologically functional equivalents thereof, are provided. Also provided is the deduced amino acid sequence of the R. rubrum PHA synthase. These molecules are useful in the production of PHAs in bacteria and plants.


Recent Northern Records Of The Nine-Banded Armadillo (Dasypodidae) In Nebraska, Patricia W. Freeman, Hugh H. Genoways Dec 1998

Recent Northern Records Of The Nine-Banded Armadillo (Dasypodidae) In Nebraska, Patricia W. Freeman, Hugh H. Genoways

Mammalogy Papers: University of Nebraska State Museum

Examination of the distribution of ninebanded armadillo in Nebraska reveals that these animals may be entering the state from two directions. The animals in Chase, Dundy, and Furnas counties appear to be closely associated with the Republican River and its tributaries and probably reached the state along these riparian habitats from northwestern Kansas and northeastern Colorado. Records in the central and eastern part of Nebraska are not closely tied to one river system. For the specimen from Ord to have followed watercourses, it would have needed to follow the Big or Little Blue rivers, crossed to the Platte River, and ...


Short-Term Hooking Mortality Of Summer Flounder In New York And Virginia, Mark H. Malchoff, Jon A. Lucy Dec 1998

Short-Term Hooking Mortality Of Summer Flounder In New York And Virginia, Mark H. Malchoff, Jon A. Lucy

Reports

No abstract provided.


Establishment Of A Functional Human Immunodeficiency Virus Type 1 (Hiv-1) Reverse Transcription Complex Involves The Cytoskeleton, Alissa G. Bukrinskaya, Beda Brichacek, Angela Mann, Mario Stevenson Dec 1998

Establishment Of A Functional Human Immunodeficiency Virus Type 1 (Hiv-1) Reverse Transcription Complex Involves The Cytoskeleton, Alissa G. Bukrinskaya, Beda Brichacek, Angela Mann, Mario Stevenson

Open Access Articles

After interaction of human immunodeficiency virus type 1 (HIV-1) virions with cell surface receptors, a series of poorly characterized events results in establishment of a viral reverse transcription complex in the host cell cytoplasm. This process is coordinated in such a way that reverse transcription is initiated shortly after formation of the viral reverse transcription complex. However, the mechanism through which virus entry and initiation of reverse transcription are coordinated and how these events are compartmentalized in the infected cell are not known. In this study, we demonstrate that viral reverse transcription complexes associate rapidly with the host cell cytoskeleton ...


Bt Corn Hybrid Evaluation: Year 2, Dale E. Farnham, Clinton Drake Pilcher Dec 1998

Bt Corn Hybrid Evaluation: Year 2, Dale E. Farnham, Clinton Drake Pilcher

Integrated Crop Management News

This past growing season was good for evaluating the impact of a variety of environmental factors on corn yield, such as nitrogen losses, hail damage, green snap, etc. It was not, however, a particularly good growing season for evaluating the damaging effects of European corn borer. Insect pressures were fairly light across the state. The light insect pressures coupled with the effects of one or more environmental factors made Bt hybrid evaluations challenging in 1998 (i.e., it was difficult to identify exactly what caused yield variability). Presented herein are the results from replicated field trials conducted by Iowa State ...


Nuisance Protection Law Unconstitutional, Neil E. Harl, Charles F. Curtiss Dec 1998

Nuisance Protection Law Unconstitutional, Neil E. Harl, Charles F. Curtiss

Integrated Crop Management News

In late September, the Iowa Supreme Court declared unanimously that an Iowa statute providing protection against nuisance suits for agricultural operations is "flagrantly" unconstitutional. The lawsuit involved the Iowa agricultural areas statute that allows counties to designate agricultural areas of at least 300 contiguous acres. Farming operations conducted within such a designated area are not subject to nuisance lawsuits if they are operated properly.


Manure Management Policy, Angela M. Rieck-Hinz Dec 1998

Manure Management Policy, Angela M. Rieck-Hinz

Integrated Crop Management News

Manure management policy and regulations are issues of concern to many Iowa crop and livestock producers. These policies and regulations have been changing so quickly that often we barely have time to comprehend the effects of one set of policies before a new draft has replaced the old policies. Currently, there are regulations in Iowa that are being discussed at both the state and federal levels.


New Scn Slide Set Available, Gregory L. Tylka Dec 1998

New Scn Slide Set Available, Gregory L. Tylka

Integrated Crop Management News

A new slide set describing the biology, symptoms, and management of soybean cyst nematode (SCN) in the Midwest is available from Iowa State University Extension. The slide set, titled "The SCN Coalition Leader's Guide for SCN Management Training," is organized in a three-ring binder and includes an illustrated script to accompany the slides. Three separate sections describing SCN biology (17 slides), symptoms and scouting (23 slides), and management (17 slides) are included in the slide set, and a fourth section (47 slides) contains an integrated presentation of all aspects of SCN biology, scouting, and management.


Cftc Complaint Upheld, Neil Harl Dec 1998

Cftc Complaint Upheld, Neil Harl

Agricultural Law Digest

The hedge-to-arrive saga took another turn on November 6, 1998, with release of the Agricultural Law Judge's opinion in the Grain Land Coop case. The hedge-to arrive controversy arose in 1995-96 when grain and soybean prices rose sharply and caught many producers with multi-year contracts hedged on a nearby futures contract month. The old crop-new crop spread between the 1995 and 1996 crops widened to unprecedented proportions in the early summer of 1996 and caused huge losses to elevators which were holding the futures obligation. Litigation since that time has endeavored to ascertain who would ultimately bear the losses ...


Cases, Regulations And Statutes, Robert P. Achenbach Jr. Dec 1998

Cases, Regulations And Statutes, Robert P. Achenbach Jr.

Agricultural Law Digest

No abstract provided.


Biochemistry Of Hemolysin Toxin Activation By Fatty Acylation: Characterization Of An Internal Protein Acyltransferase, Michael S. Trent Dec 1998

Biochemistry Of Hemolysin Toxin Activation By Fatty Acylation: Characterization Of An Internal Protein Acyltransferase, Michael S. Trent

Electronic Theses and Dissertations

Hemolysin toxin produced and secreted by pathogenic Escherichia coli is one of a family of cytolytic, structurally homologous protein toxins known as RTX (repeats in toxin) toxins. RTX toxins are products of a gene cluster, CABD . The A gene product, nontoxic hemolysin (proHlyA) is made toxic by post-translational fatty acylation of two internal lysine residues. HlyC, C gene product, is essential for acylation, and acyl-acyl carrier protein (ACP) is the acyl donor. HlyB and HlyD are involved in secretion of the toxin. HlyC was thought to serve as an internal protein acyltransferase and remained uncharacterized until now. ProHlyA and HlyC ...


Can The Irish Grey Partridge (Perdix Perdix) Be Saved? A National Conservation Strategy., Brendan P. Kavanagh Dec 1998

Can The Irish Grey Partridge (Perdix Perdix) Be Saved? A National Conservation Strategy., Brendan P. Kavanagh

Division of Biology Articles

The grey partridge, Perdix perdix, is endemic to Ireland and has been declining since 1850. A contraction of range has occurred in the past 30 years with 3% of the country recording birds in 1991. The decline has continued through the 1990s with many populations disappearing. In 1995 partridge were only in two areas outside County Wexford. Both these populations were on cutaway bogland under natural recolonisation. The total number of wild partridge was < 100 pairs in 1995. The objective of this study was to suggest a conservation strategy for the remaining birds. Radio telemetry studies (HEARSHAW, 1996) revealed low breeding success within these populations with hooded crow, Corvus corone cornix, predation responsible for most losses. Radio-collared birds preferred cutaway bogland as opposed to surrounding farmland. Within cutaways railway lines were most preferred. Insufficient young birds were produced to compensate for natural loss. Management of one wild population in 1994 and 1995 involving hooded crow and red fox, Vulpes vulpes, control from February to June has resulted in an increase in partridges. Paris selected territories on farmland for the first time in 1995. Release of captive reared by 1992 and 1993 on two farmland sites was ineffective. All birds died within days of release. Releases on one cutaway was more successful with good winter survival after 60-70% initial losses in the first 2 weeks. Adoption of released birds by wild barren pairs may have improved survival. The conservation strategy for grey partridges involves continued management of the remnant population using traditional methods. Release of birds in depleted populations is continuing as is radio tracking of wild birds.


Assessing Soil Quality In A Riparian Buffer By Testing Organic Matter Fractions In Central Iowa, Usa, Carmen Omaira Marquez, Cynthia A. Cambardella, Thomas M. Isenhart, Richard C. Schultz Dec 1998

Assessing Soil Quality In A Riparian Buffer By Testing Organic Matter Fractions In Central Iowa, Usa, Carmen Omaira Marquez, Cynthia A. Cambardella, Thomas M. Isenhart, Richard C. Schultz

Forestry Publications

A multispecies riparian buffer strip (MRB) was established along Bear Creek in central Iowa by the Agroecology Issues Team at Iowa State University (ISU) in order to assess the ability of the MRB to positively impact soil erosion and process non-point source pollutants to improve water quality. Soil organic matter (SOM), and especially biologically-active soil organic matter, is considered to be an important soil quality indicator variable because of it has relationship to critical soil functions like erodibility and the capacity of the soil to act as an environmental buffer. The objectives of this study were to examine trends in ...


Bulletin No. 36: Amphibians And Reptiles Of The Connecticut College Arboretum, Jill Devito, Joseph Markow Dec 1998

Bulletin No. 36: Amphibians And Reptiles Of The Connecticut College Arboretum, Jill Devito, Joseph Markow

Bulletins

No abstract provided.


Evaluation Of A Methyl Anthranilate-Based Bird Repellent: Toxicity To Channel Catfish Ictalurus Punctatus And Effect On Great Blue Heron Ardea Herodias Feeding Behavior, Brian S. Dorr, Larry Clark, Igor Mezine Dec 1998

Evaluation Of A Methyl Anthranilate-Based Bird Repellent: Toxicity To Channel Catfish Ictalurus Punctatus And Effect On Great Blue Heron Ardea Herodias Feeding Behavior, Brian S. Dorr, Larry Clark, Igor Mezine

Brian S Dorr

No abstract provided.