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1997

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Full-Text Articles in Life Sciences

Assessment Of Shellfish Populations In The Great Bay Estuary, Richard Langan Dec 1997

Assessment Of Shellfish Populations In The Great Bay Estuary, Richard Langan

PREP Reports & Publications

No abstract provided.


The Tim54p–Tim22p Complex Mediates Insertion Of Proteins Into The Mitochondrial Inner Membrane, Oliver Kerscher, Jason Holder, Maithreyan Srinivasan, Roxanne S. Leung, Robert E. Jensen Dec 1997

The Tim54p–Tim22p Complex Mediates Insertion Of Proteins Into The Mitochondrial Inner Membrane, Oliver Kerscher, Jason Holder, Maithreyan Srinivasan, Roxanne S. Leung, Robert E. Jensen

Arts & Sciences Publications

We have identified a new protein, Tim54p, located in the yeast mitochondrial inner membrane. Tim54p is an essential import component, required for the insertion of at least two polytopic proteins into the inner membrane, but not for the translocation of precursors into the matrix. Several observations suggest that Tim54p and Tim22p are part of a protein complex in the inner membrane distinct from the previously characterized Tim23p-Tim17p complex. First, multiple copies of the TIM22 gene, but not TIM23 or TIM17, suppress the growth defect of a tim54-1 temperature-sensitive mutant. Second, Tim22p can be coprecipitated with Tim54p from detergent-solubilized mitochondria, but ...


Cases, Regulations And Statutes, Robert P. Achenbach Jr. Dec 1997

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

Agricultural Law Digest

No abstract provided.


More On Fobe, Neil Harl Dec 1997

More On Fobe, Neil Harl

Agricultural Law Digest

The family-owned business exclusion, enacted as part of the Taxpayer Relief Act of 1997 contained numerous omissions and ambiguities as enacted. A letter from the Joint Committee on Taxation to Sen. Charles E. Grassley of Iowa has provided additional insights into JCT’s view of how the statute should be interpreted.


Index To Volume 8, Nos. 1-24, Agricultural Law Digest Dec 1997

Index To Volume 8, Nos. 1-24, Agricultural Law Digest

Agricultural Law Digest

No abstract provided.


Quantitative Assessment Of Fishing Mortality For Tautog (Tautoga Onitis) In Virginia : Preliminary Report, Geoffrey G. White, James E. Kirkley, Jon A. Lucy Dec 1997

Quantitative Assessment Of Fishing Mortality For Tautog (Tautoga Onitis) In Virginia : Preliminary Report, Geoffrey G. White, James E. Kirkley, Jon A. Lucy

Reports

Tautog (Tautoga onitis) have become a popular food and sport fish from Massachusetts to Virginia over the past ten years. Tautog are a long lived (30 years), late maturing (3-4 years), slow growing species. Although the maximum age recorded in Virginia is 31 years, recent studies have found that over 95% of the population is less than 12 years old (Hostetter and Munroe, 1993; White et aL, 1996). Adult tautog inhabit hard bottom wreck and reef environments, which are limited in Virginia's waters and are easily located and re-located by fishermen. Tautog are known to migrate inshore-offshore in New ...


West River Ag Center Crops And Soils Research Annual Progress Report, 1997, Agricultural Experiment Station Dec 1997

West River Ag Center Crops And Soils Research Annual Progress Report, 1997, Agricultural Experiment Station

Agricultural Experiment Station and Research Farm Annual Reports

This is the 1976 progress report of the West River Crops and Soils Research Projects, South Dakota Agricultural Experiment Station. This document includes reports on: weather and climate, wheat and grain variety trials, management and tillage, and weed and pest control.


Northeast Research Station Watertown, South Dakota Annual Progress Report, 1997, Agricultural Experiment Station, Plant Science Department Dec 1997

Northeast Research Station Watertown, South Dakota Annual Progress Report, 1997, Agricultural Experiment Station, Plant Science Department

Agricultural Experiment Station and Research Farm Annual Reports

This is the 1997 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 1997 crop season, including: precipitation summary, canola evaluations, flax trials, crop trials and performance test, fertilizer test on corn, row spacing effects on corn, rotation studies.


Activation Of A Retroviral Membrane Fusion Protein: Soluble Receptor-Induced Liposome Binding Of The Alsv Envelope Glycoprotein, Lorraine D. Hernandez, Reuben J. Peters, Sue E. Delos, John A. T. Young, David A. Agard, Judith M. White Dec 1997

Activation Of A Retroviral Membrane Fusion Protein: Soluble Receptor-Induced Liposome Binding Of The Alsv Envelope Glycoprotein, Lorraine D. Hernandez, Reuben J. Peters, Sue E. Delos, John A. T. Young, David A. Agard, Judith M. White

Reuben J. Peters

It is not known how membrane fusion proteins that function at neutral pH, for example the human immunodeficiency virus envelope (Env) glycoprotein and intracellular fusion machines, are activated for target bilayer binding. We have addressed this question using a soluble oligomeric form of an avian retroviral Env glycoprotein (API) and soluble forms of its receptor. Binding of soluble receptor to API induces API to bind to liposomes composed of phosphatidylcholine and cholesterol at neutral pH. Liposome binding only occurs at fusion permissive temperatures (T > 20°C), is complete between 2 to 5 min at 37°C, and is stable to ...


Cropwatch No. 97-26, Dec. 12, 1997, Lisa Brown Jasa Dec 1997

Cropwatch No. 97-26, Dec. 12, 1997, Lisa Brown Jasa

Crop Watch

Inside

Field reports.............198

Bt corn resource.............199

Farm-saved soybean seed.............201

Seed lab tests.............201

Roundup Ready.............201

Winter Extension meetings.............202

Crop Watch index.............203

Weather update.............206

Regent approved.............206

Crop Watch

Order Form.............206


Intracellular Lipid-Binding Proteins And Their Genes, David A. Bernlohr, Melanie A. Simpson, Ann Vogel Hertzel, Leonard J. Banaszak Dec 1997

Intracellular Lipid-Binding Proteins And Their Genes, David A. Bernlohr, Melanie A. Simpson, Ann Vogel Hertzel, Leonard J. Banaszak

Biochemistry -- Faculty Publications

Intracellular lipid-binding proteins are a family of low-molecularweight single-chain polypeptides that form 1:1 complexes with fatty acids, retinoids, or other hydrophobic ligands. These proteins are products of a large multigene family of unlinked loci distributed throughout the genome. Each lipid-binding protein exhibits a distinctive pattern of tissue distribution. Transcriptional control, regulated by a combination of peroxisome proliferator activated receptors and CCAAT/enhancer-binding proteins, allows for a variety of both cell and tissue-specific expression patterns. In some cells, fatty acids increase the expression of the lipid-binding protein genes. Fatty acids, or their metabolites, are activators of the peroxisome proliferator–activated ...


International Markets, Merlyn Carlson Dec 1997

International Markets, Merlyn Carlson

Range Beef Cow Symposium

The potential for International Beef Marketing is both a dynamic and exciting agenda. However, it has been tempered by concern for safety of the food supply. We all recognize a growing percentage of United States beef producers income is tied to beef exports. All preliminary figures point to US. Beef Exports for calendar year 1997 will meet or exceed 1996 levels with an impressive $3 billion sales (wholesale value) or 13 percent of the U.S. beef supply.

Export opportunities are growing for the beef industry, not only from population growth but also from a booming growth in disposable income ...


Future Of International Markets – Beef Cattle, Norman L. Dalsted Dec 1997

Future Of International Markets – Beef Cattle, Norman L. Dalsted

Range Beef Cow Symposium

As cattle producers are slowly working their way through the downturn in the current "infamous" cattle cycle what will the next century bring. At the turn of the last century the cattle industry was in its infancy relative to the position it currently holds in the U.S. agricultural sector. Some experts often refer to the cattle business as a mature, well established entity indicating that cattle producers, processors, and packers represent an established, stable component of the agricultural sector. However, the dynamics of this industry are anything but stable to the individual cattle producer. Thus, as we enter the ...


Beef Quality Assurance–Past, Present, Future, Gary C. Smith, J. D. Tatum, K. E. Belk Dec 1997

Beef Quality Assurance–Past, Present, Future, Gary C. Smith, J. D. Tatum, K. E. Belk

Range Beef Cow Symposium

The Beef Quality Assurance Task Force (BQATF) was formed in early 1986 when three NCBA (then, the National Cattlemen's Association) Policy Committees independently directed NCBA to address "the growing issue of consumer concern about the safety and wholesomeness of beef." It was believed that the cattle industry's efforts aimed at improving beefs image as a healthful food with regard to its nutrient profile could not stand alone, and that lingering consumer concerns about drug and chemical residues in beef could negate any progress made in the diet/health area. Consequently, the BQATF (then, the Beef Safety Assurance Task ...


Introduction To The Symposium On Double-Crested Cormorants: Population Status And Management Issues In The Midwest, Stephen J. Lewis, D.V. (Chip) Weseloh Dec 1997

Introduction To The Symposium On Double-Crested Cormorants: Population Status And Management Issues In The Midwest, Stephen J. Lewis, D.V. (Chip) Weseloh

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

Populations of double-crested cormorants (Phalacrocorax auritus) have increased dramatically in the last 2 decades, particularly in the Great Lakes and the Southeastern United States. Their food habits and propensity for killing the trees in which they nest and roost have made cormorants the subject of much controversy. Cormorants affect—or are perceived to affect—sport fishing, aquaculture operations, vegetation, and other colonial waterbirds. Anglers, aquaculturists, resort operators, lakehome owners, politicians, and others are calling for a solution to these problems. This symposium was convened to provide information that will help conservation agencies and others make sound resource management decisions about ...


Front Matter And Contents Dec 1997

Front Matter And Contents

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest


The Problems Of Being Successful: Managing Interactions Between Humans And Double-Crested Cormorants, Douglas Siegel-Causey Dec 1997

The Problems Of Being Successful: Managing Interactions Between Humans And Double-Crested Cormorants, Douglas Siegel-Causey

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

The natural history, behavior, and ecology of double-crested cormorants (Phalacrocorax auritus) predispose this species for conflict with human sport and commercial fisheries. Cormorants breed early in life, have large broods, are efficient predators even in marginal conditions, seem to be able to adjust colony sizes quickly in response to local conditions, and have limited requirements for feeding and nesting habitats. A survey of the past history of successes and failures in managing cormorants reveals that economic impact is greatest with aquaculture and least in sport fisheries. Research during the past 5 years suggests that some control methods like culling and ...


Nesting Populations Of Double-Crested Cormorants In The United States And Canada, Laura A. Tyson, Jerrold L. Belant, Francesca J. Cuthbert, D.V. (Chip) Weseloh Dec 1997

Nesting Populations Of Double-Crested Cormorants In The United States And Canada, Laura A. Tyson, Jerrold L. Belant, Francesca J. Cuthbert, D.V. (Chip) Weseloh

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

Double-crested cormorants (Phalacrocorax auritus) are receiving increasing attention in North America because of depredations at aquaculture facilities and alleged impacts on sport and commercial fisheries. We obtained recent (most since 1994) estimates for the number of nesting double-crested cormorants in the United States and Canada from published references and by conducting telephone interviews with State and Provincial biologists. Using published data, we also determined annual rates of change in the number of cormorants since about 1990. The estimated minimum number of nesting pairs (colonies) of double-crested cormorants was 372,000 (852). Most cormorants nested in the Interior region (68 percent ...


Changes In The Status, Distribution, And Management Of Double-Crested Cormorants In Wisconsin, Summer W. Matteson, Paul W. Rasmussen, Kenneth L. Stromborg, Thomas I. Meier, Julie Van Stappen, Eric C. Nelson Dec 1997

Changes In The Status, Distribution, And Management Of Double-Crested Cormorants In Wisconsin, Summer W. Matteson, Paul W. Rasmussen, Kenneth L. Stromborg, Thomas I. Meier, Julie Van Stappen, Eric C. Nelson

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

We reviewed and summarized historical data and conducted population surveys from 1973 through 1997 to determine the breeding status and distribution of doublecrested cormorants (Phalacrocorax auritus) in Wisconsin. Breeding cormorants historically occupied large, isolated lakes and wetlands in northern Wisconsin, but there were no known nesting sites until 1919, when cormorants were reported nesting on Lake Wisconsin in south-central Wisconsin. From the 1920’s to the 1950’s, cormorants occupied 17 colony sites in 16 counties, though no more than 7 sites were occupied during any particular year. From the 1950’s to the early 1970’s, the number of ...


Impact Of Double-Crested Cormorant Predation On The Yellow Perch Population In The Les Cheneaux Islands Of Michigan, Glenn Y. Belyea, Susan L. Maruca, James S. Diana, Philip J. Schneeberger, Steve J. Scott, Richard D. Clark Jr., James P. Ludwig, Cheryl L. Summer Dec 1997

Impact Of Double-Crested Cormorant Predation On The Yellow Perch Population In The Les Cheneaux Islands Of Michigan, Glenn Y. Belyea, Susan L. Maruca, James S. Diana, Philip J. Schneeberger, Steve J. Scott, Richard D. Clark Jr., James P. Ludwig, Cheryl L. Summer

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

The Michigan Department of Natural Resources, in conjunction with the University of Michigan and the U.S. Fish and Wildlife Service, initiated a research study to determine the impact of double-crested cormorants (Phalacrocorax auritus) on the yellow perch (Perca flavescens) population in the Les Cheneaux Islands area of northern Lake Huron. Aerial and nesting colony counts were conducted to monitor cormorant abundance. Creel census counts and tagging of 8,400 perch were used to study perch abundance. We collected 373 cormorants to study food habits via stomach-content analysis. We found that (1) cormorants fed heavily on yellow perch in early ...


Fish Losses To Double-Crested Cormorant Predation In Eastern Lake Ontario, 1992–97, Robert M. Ross, James H. Johnson Dec 1997

Fish Losses To Double-Crested Cormorant Predation In Eastern Lake Ontario, 1992–97, Robert M. Ross, James H. Johnson

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

We examined 4,848 regurgitated digestive pellets of double-crested cormorants (Phalacrocorax auritus) over a 6-year period (1992–97) to estimate annual predation on sport and other fishes in the eastern basin of Lake Ontario. We found more than 51,000 fish of 28 species. Using a model that incorporates annual colony nest counts; fledgling production rates; adult, immature, and young-of-year residence times (seasonal); estimates of mean number of fish per pellet and mean fish size; and a fecal pathway correction factor (4.0 percent), we estimate total annual number of fish consumed by cormorants in the eastern basin of Lake ...


Diet Of The Double-Crested Cormorant In Western Lake Erie, Michael T. Bur, Sandra L. Tinnirello, Charles D. Lovell, Jeff T. Tyson Dec 1997

Diet Of The Double-Crested Cormorant In Western Lake Erie, Michael T. Bur, Sandra L. Tinnirello, Charles D. Lovell, Jeff T. Tyson

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

Sport and commercial fishing interest groups are concerned about potential impacts double-crested cormorants (Phalacrocorax auritus) may have on fish species. Our objectives for this study were to determine the diet of the cormorant in western Lake Erie and the diet overlap and competition for resources with piscivorous fish, such as walleye (Stizostedion vitreum.) The stomach contents of 302 double-crested cormorants collected in western Lake Erie consisted primarily of young-of-the-year gizzard shad (Dorosoma cepedianum), emerald shiner (Notropis atherinoides,) and freshwater drum (Aplodinotus grunniens). In the spring, freshwater drum were the most frequently occurring food in the stomachs and constituted the greatest ...


Double-Crested Cormorant Impacts On Sport Fish: Literature Review, Agency Survey, And Strategies, John L. Trapp, Stephen J. Lewis, Diane M. Pence Dec 1997

Double-Crested Cormorant Impacts On Sport Fish: Literature Review, Agency Survey, And Strategies, John L. Trapp, Stephen J. Lewis, Diane M. Pence

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

In response to concerns expressed by anglers, the U.S. Fish and Wildlife Service conducted an extensive review of published studies done throughout the United States and Canada on the impacts of double-crested cormorants (Phalacrocorax auritus) on sport-fish populations in open waters. The literature review indicated that fish species valued by sport and commercial anglers make up a very small proportion of the cormorants’ diet and that these birds have a minor effect on fish populations compared to the effects of sport and commercial fishing, natural predation, and other mortality factors. The Service sent a questionnaire to State agencies, soliciting ...


Strategies To Reduce Double-Crested Cormorant Depredation At Aquaculture Facilities In Mississippi, David S. Reinhold, Charles A. (Bo) Sloan Dec 1997

Strategies To Reduce Double-Crested Cormorant Depredation At Aquaculture Facilities In Mississippi, David S. Reinhold, Charles A. (Bo) Sloan

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

Double-crested cormorant (Phalacrocorax auritus) depredation throughout the Southeastern United States has been on the increase over the past 20 years. The increase in depredation coincides with the growth of the aquaculture industry and an expansion of double-crested cormorant wintering populations throughout the Southeast. The U.S. Department of Agriculture–Animal and Plant Health Inspection Service–Wildlife Services plays a major role in reducing double-crested cormorant damage. Nonlethal harassment on farms, dispersal from night roosts, and lethal control have reduced double-crested cormorant depredation at aquaculture farms in Mississippi. However, the efficiency and compatibility of current methods of reducing double-crested cormorant depredation ...


Possible Effects Of Catfish Exploitation On Overwinter Body Condition Of Double-Crested Cormorants, James F. Glahn, Mark E. Tobin, J. Brent Harrel Dec 1997

Possible Effects Of Catfish Exploitation On Overwinter Body Condition Of Double-Crested Cormorants, James F. Glahn, Mark E. Tobin, J. Brent Harrel

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

Concurrent with the rapid growth of the Mississippi catfish industry during the 1980’s, there was evidence of similar growth of double-crested cormorant (Phalacrocorax auritus) populations wintering in the delta region of Mississippi. Observational and food habits studies indicate that this expansive industry, incorporating more than 100,000 acres of ponds, provides an enormous food base for overwintering populations estimated in recent years to exceed 50,000 birds. As much as 75 percent of the diet in certain roosting areas of the Mississippi delta consisted of catfish, and according to bioenergetic models cormorants can exploit as much as 940 metric ...


Colonial Waterbird Nesting On West Sister Island National Wildlife Refuge And The Arrival Of Double-Crested Cormorants, Mark C. Shieldcastle, Larry Martin Dec 1997

Colonial Waterbird Nesting On West Sister Island National Wildlife Refuge And The Arrival Of Double-Crested Cormorants, Mark C. Shieldcastle, Larry Martin

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

Recent survey data have shown the importance of West Sister Island National Wildlife Refuge, Lake Erie, to nesting waders. About 40 percent of all herons and egrets nesting in the U.S. Great Lakes are found there, including the Great Lakes’ largest colonies of great blue heron (Ardea herodias), great egret (Ardea alba), and black-crowned nightheron (Nycticorax nycticorax), and the largest of two snowy egret (Egretta thula). West Sister Island’s importance to Ohio has grown in recent decades with the loss of smaller mainland colonies of waders, especially the black-crowned night-heron. The double-crested cormorant (Phalacrocorax auritus) returned to Ohio ...


A Geographic Information System To Monitor Nest Distributions Of Double-Crested Cormorants And Black-Crowned Night-Herons At Shared Colony Sites Near Toronto, Canada, S. Jarvie, H. Blokpoel, T. Chipperfield Dec 1997

A Geographic Information System To Monitor Nest Distributions Of Double-Crested Cormorants And Black-Crowned Night-Herons At Shared Colony Sites Near Toronto, Canada, S. Jarvie, H. Blokpoel, T. Chipperfield

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

In the early 1990’s, it became apparent that the rapid colonization of Tommy Thompson Park on Lake Ontario near Toronto by double-crested cormorants (Phalacrocorax auritus) would eventually affect the existing colonies of blackcrowned night-herons (Nycticorax nycticorax) owing to competition for nest sites and destruction of nest trees. As a result, monitoring of these two species was expanded in 1992 by individually marking all nest trees (using permanent metal tree tags) and by recording the numbers of heron and cormorant nests for all nest trees. In 1996, professional surveyors determined the exact locations of nest trees. We have developed a ...


Double-Crested Cormorant Culling In The St. Lawrence River Estuary: Results Of A 5-Year Program, J. Bedard, A. Nadeau, M. Lepage Dec 1997

Double-Crested Cormorant Culling In The St. Lawrence River Estuary: Results Of A 5-Year Program, J. Bedard, A. Nadeau, M. Lepage

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

Modeling indicated that lowering the doublecrested cormorant population from 17,361 to 10,000 pairs could be attained only by a combination of techniques: culling breeding birds in arboreal colonies to lower breeding stock and egg spraying in accessible ground nests to lower recruitment. The 5-year program was launched in 1989; culling was halted 4 years later because the population had fallen below the threshold of 10,000 breeding pairs. A greater vulnerability of males to shooting (203:100) probably accounted for the faster-than-predicted drop in numbers. Egg spraying spanned the entire 5-year period, during which 25,095 nests were ...


Information Needs For The Double-Crested Cormorant In Midwestern North America, As Identified By An Audience Survey , D.V. (Chip) Weseloh, Stephen J. Lewis Dec 1997

Information Needs For The Double-Crested Cormorant In Midwestern North America, As Identified By An Audience Survey , D.V. (Chip) Weseloh, Stephen J. Lewis

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest

Double-crested cormorant (DCCO) research needs and data gaps were identified in the early 1990’s by Erwin (1995) and Nisbet (1995). Erwin (1995) recommended four areas of research: (1) large-scale banding and marking to determine age- and sex specific survival and fecundity, (2) studies of movements during migration and winter, (3) assessment of limiting factors such as contaminants and disease, especially in light of recent Newcastle disease in cormorants, and (4) evaluation of economic impacts of cormorants on cultured fishes and ways to reduce predation by fish-eating birds.


Double-Crested Cormorants In The Midwest: Symposium Summary, Francesca J. Cuthbert Dec 1997

Double-Crested Cormorants In The Midwest: Symposium Summary, Francesca J. Cuthbert

Symposium on Double-Crested Cormorants: Population Status and Management Issues in the Midwest


Populations of double-crested cormorants (DCCO’s, Phalacrocorax auritus) have increased dramatically in North America during the past 2 decades (1978–98), especially in the Great Lakes region and Southeastern United States. Concern about the impact, real or imagined, of DCCO’s on economics and ecosystem health has risen in parallel to the increase in cormorant numbers.

A daylong symposium on this subject was opened by Stephen Lewis and D. V. (Chip) Weseloh, who introduced the audience to the general problems associated with cormorants in the Midwest. The moderators identified the following symposium objectives: (1) to provide current information on the ...