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2001

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Articles 1 - 30 of 2779

Full-Text Articles in Life Sciences

Will Theaters Receive Two Thumbs Up From Individuals With Disabilities?, Joseph H. Huber Dec 2001

Will Theaters Receive Two Thumbs Up From Individuals With Disabilities?, Joseph H. Huber

Movement Arts, Health Promotion and Leisure Studies Faculty Publications

No abstract provided.


Molecular Mechanisms Involved In Human Platelet Aggregation By Synergistic Interaction Of Platelet-Activating Factor And 5-Hydroxytryptamine, B H. Shah, H Rasheed, I H. Rahman, A H. Shariff, F L. Khan, H B. Rahman, S Hanif, S A. Saeed Dec 2001

Molecular Mechanisms Involved In Human Platelet Aggregation By Synergistic Interaction Of Platelet-Activating Factor And 5-Hydroxytryptamine, B H. Shah, H Rasheed, I H. Rahman, A H. Shariff, F L. Khan, H B. Rahman, S Hanif, S A. Saeed

Department of Biological & Biomedical Sciences

Our recent studies have shown that co-activation of Gq and Gi proteins by 5-hydroxytryptamine (5-HT) and adrenaline show synergism in human platelet aggregation. This study was conducted to examine the mechanism(s) of synergistic interaction of 5-HT and platelet activating factor (PAF) in human platelets. We show that PAF, but not 5-HT, increased platelet aggregation in a concentration-dependent manner. However, low concentrations of 5-HT (2 microM) potentiated platelet aggregation induced by subthreshold concentration of PAF (40 nM) indicating a synergistic interaction between the two agonists and this synergism was blocked by receptor antagonists to either 5-HT or PAF. 5-HT also ...


A Synopsis Of The Ferns And Fern Allies Of Nebraska, With Maps Of Their Distribution, Steven B. Rolfsmeier, Robert B. Kaul, David M. Sutherland Dec 2001

A Synopsis Of The Ferns And Fern Allies Of Nebraska, With Maps Of Their Distribution, Steven B. Rolfsmeier, Robert B. Kaul, David M. Sutherland

Faculty Publications in the Biological Sciences

An annotated list and county-by-county distribution maps are presented for the 32 species of ferns and fern allies native to Nebraska, based upon field and herbarium studies and critical evaluation of the literature. Native to the state are Isoetes melanopoda, Selaginella rupestris, five species of Equisetum, and 25 species in 18 genera of ferns. Three native species are here verified for the first time, based upon recent collections: Matteuccia struthiopteris var. pensylvanica, Ophioglossum engelmannii, and Pellaeaglabella ssp. glabella. Isoetes melanopoda was rediscovered in 2000, the first record since 1941. Rejected are published reports of Lycopodium annotinum, Selaginella densa, Equisetum ...


Micrornas: Tiny Regulators With Great Potential, Victor Ambros Dec 2001

Micrornas: Tiny Regulators With Great Potential, Victor Ambros

Victor R. Ambros

Animal genomes contain an abundance of small genes that produce regulatory RNAs of about 22 nucleotides in length. These microRNAs are diverse in sequence and expression patterns, and are evolutionarily widespread, suggesting that they may participate in a wide range of genetic regulatory pathways.


Evaluation Of Striped Bass Stocks In Virginia, Monitoring And Tagging Studies, 1999-2003 Annual Report, 1 September 2000 - 31 October 2001, Philip W. Sadler, Robert J. Latour, Robert E. Harris, John E. Olney Dec 2001

Evaluation Of Striped Bass Stocks In Virginia, Monitoring And Tagging Studies, 1999-2003 Annual Report, 1 September 2000 - 31 October 2001, Philip W. Sadler, Robert J. Latour, Robert E. Harris, John E. Olney

Reports

This report presents the results of striped bass (Marone saxatilis) tagging and monitoring activities in Virginia during the penod 1 September 2000 through 31 October 2001. It includes an assessment of the biological characteristics of striped bass taken from the 2001 spring spawning run, estimates of annual survtval based on annual spring tagging, and the results of the fall 2000 directed mortality study that is cooperative with the Maryland Department of Natural Resources. The information contained in this report is required by the Atlantic States Marine Fisheries Commission and is used to implement a coordinated management plan for striped bass ...


Molecular Phylogenetic Studies In Rosaceae, Christopher S. Campbell Dec 2001

Molecular Phylogenetic Studies In Rosaceae, Christopher S. Campbell

University of Maine Office of Research Administration: Grant Reports

This project will investigate the evolutionary relationships within the large and important rose family. This group of plants contains numerous commercially valuable fruits (apples, pears, strawberries, cherries, peaches, plums, blackberries, and raspberries) and many horticulturally significant plants (roses, cotoneaster, lady's mantle, bridle-wreath, flowering quince, fire-thorn, cinqfoil, and others). Despite the large and important role that these plants play in our daily lives and scientific interest, we do not have a clear view of the evolutionary relationships of members of the family. A primary reason for this situation is that insufficient evidence has been accumulated to adequately address the problem ...


Manipulation Of Prenatal Hormones And Dietary Phytoestrogens During Adulthood Alter The Sexually Dimorphic Expression Of Visual Spatial Memory, Edwin D. Lephart, Trent D. Lund Dec 2001

Manipulation Of Prenatal Hormones And Dietary Phytoestrogens During Adulthood Alter The Sexually Dimorphic Expression Of Visual Spatial Memory, Edwin D. Lephart, Trent D. Lund

Faculty Publications

In learning and memory tasks, requiring visual spatial memory (VSM), males exhibit higher performance levels compared to females (a difference attributed to sex steroid hormonal influences). Based upon the results from our companion investigation, this study examined the influence of prenatal sex steroid hormone manipulations on VSM in adulthood, as assessed in the radial arm maze. Additionally, the influence of dietary soy phytoestrogens (i.e., the presence of high or low estrogen-like compounds present in the animal's diet) on VSM was examined in combination with the prenatal hormonal manipulations. Results: Radial arm maze performance on a phytoestrogen-rich diet: 1 ...


Visual Spatial Memory Is Enhanced In Female Rats (But Inhibited In Males) By Dietary Soy Phytoestrogens, Edwin D. Lephart, Trent D. Lund, Timothy W. West, Lilyan Y. Tian, Lihong H. Bu, Daniel L. Simmons, Kenneth Setchell, Herman Adlercreutz Dec 2001

Visual Spatial Memory Is Enhanced In Female Rats (But Inhibited In Males) By Dietary Soy Phytoestrogens, Edwin D. Lephart, Trent D. Lund, Timothy W. West, Lilyan Y. Tian, Lihong H. Bu, Daniel L. Simmons, Kenneth Setchell, Herman Adlercreutz

Faculty Publications

In learning and memory tasks, requiring visual spatial memory (VSM), males exhibit superior performance to females (a difference attributed to the hormonal influence of estrogen). This study examined the influence of phytoestrogens (estrogen-like plant compounds) on VSM, utilizing radial arm-maze methods to examine varying aspects of memory. Additionally, brain phytoestrogen, calbindin (CALB), and cyclooxygenase-2 (COX-2) levels were determined. Results: Female rats receiving lifelong exposure to a high-phytoestrogen containing diet (Phyto-600) acquired the maze faster than females fed a phytoestrogen-free diet (Phyto-free); in males the opposite diet effect was identified. In a separate experiment, at 80 days-of-age, animals fed the Phyto-600 ...


Longitudinal Variation In Muscle Protein Expression And Contraction Kinetics Of Largemouth Bass Axial Muscle, Tierney M. Thys, Jason M. Blank, David J. Coughlin, Fred Schachat Dec 2001

Longitudinal Variation In Muscle Protein Expression And Contraction Kinetics Of Largemouth Bass Axial Muscle, Tierney M. Thys, Jason M. Blank, David J. Coughlin, Fred Schachat

Biological Sciences

The present study investigates muscle protein expression in largemouth bass Micropterus salmoides through intra- and intermyomeric comparisons of white muscle. Using denaturing SDS-polyacrylamide gel electrophoresis, muscle protein expression in the arm and cone regions of sequential myomeres was compared for three bass. Low percentage (4.75 %) polyacrylamide-SDS gels and cyanogen bromide (CNBr) peptide mapping revealed no obvious intramyomeric differences between the myosin heavy chains of the arm and cone regions. Electrophoresis of myofibrils and muscle homogenates on higher percentage gels also failed to demonstrate any significant differences between arm and cone regions in either the myosin light chains or any ...


Northeast Research Station Watertown, South Dakota Annual Progress Report, 2001, Agricultural Experiment Station, Plant Science Department Dec 2001

Northeast Research Station Watertown, South Dakota Annual Progress Report, 2001, Agricultural Experiment Station, Plant Science Department

Agricultural Experiment Station and Research Farm Annual Reports

This is the 2001 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 weather data, yield comparisons, crop performance trials, corn trials, soybean trials, winter wheat performance testing, Barley Foliar information, weed and pest control, herbicide demonstrations, canola and flax variety trials and more.


West River Ag Center Crops And Soils Research Annual Progress Report, 2001, Agricultural Experiment Station Dec 2001

West River Ag Center Crops And Soils Research Annual Progress Report, 2001, Agricultural Experiment Station

Agricultural Experiment Station and Research Farm Annual Reports

This is the 2001 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.


West Florida Shelf Response To Local Wind Forcing: April 1998, Robert H. Weisberg, Zhenjiang Li, Frank E. Muller-Karger Dec 2001

West Florida Shelf Response To Local Wind Forcing: April 1998, Robert H. Weisberg, Zhenjiang Li, Frank E. Muller-Karger

Marine Science Faculty Publications

We compare west Florida shelf velocity and sea level data with a model simulation for April 1998. Responses for three upwelling and three downwelling favorable wind events are documented. Along-shelf jets accompanied by oppositely directed upper and lower layer across-shelf flows (with connecting vertical velocity) comprise the fully three-dimensional inner shelf responses, which are sensitive to stratification. With an initial density field representative of April 1998 the model simulates velocity and sea level variations in general agreement with the observations, whereas substantial mismatches occur without stratification. Despite the winds being the primary motive agent for the inner shelf the stratification ...


Growth And Metabolism Of Larval Zebrafish: Effects Of Swim Training, Brian P. Bagatto, B. Pelster, W. W. Burggren Dec 2001

Growth And Metabolism Of Larval Zebrafish: Effects Of Swim Training, Brian P. Bagatto, B. Pelster, W. W. Burggren

Brian P. Bagatto

Larval zebrafish (Danio rerio) of three different age classes ('yolk-sac' larvae, 96 h; 'swim-up' larvae, 9 days old; and 'free-swimming' larvae, 21 days old) were trained for 2, 6 and 11 days, respectively, to swim at 0 body lengths per second (BL s(-1)), 2 BL s(-1) and 5 BL s(-1). Survival was significantly diminished in larvae trained at 5 BL s(-1) compared to controls (0 BL s(-1)). Although training produced no significant differences in mass and length, the youngest larvae absorbed their yolk at a faster rate during training. Routine oxygen consumption (M(O2r)) and ...


Traversing The Internet For Useful Information, Julie Walker, Kory Bierle Dec 2001

Traversing The Internet For Useful Information, Julie Walker, Kory Bierle

Range Beef Cow Symposium

In the fast paced livestock industry, producers are looking for information that can give them an edge in a timely manner. Never before has so much information been at our fingertips. The Internet is an excellent tool that can be used for obtaining good research-based information. The type of information available on the Internet is endless. Daily, weekly, and yearly reports such as market reports can be found on free sites as well as private sites. When questions arise the Internet can be a resource finder. In addition, e-mail allows you to communicate with individuals on your time schedule.

Obtaining ...


Managing Young Cows, Dick Pruitt Dec 2001

Managing Young Cows, Dick Pruitt

Range Beef Cow Symposium

In a recent analysis of SPA records from the Northern Great Plains, pregnancy percentage, calving percentage and weaning percentage were important production variables related to profit (Dunn, 2000). The high profit group did not wean heavier calves than the medium profit group. Consistent with other studies, the high profit group had lower investment and total expenditures per cow than the medium or low profit groups. Although describing what makes a cow-calf enterprise profitable is not as simple as we might like, there is strong evidence that relatively high reproductive rate in combination with low cost of production is a very ...


Fat Supplementation For Beef Cows, Ivan G. Rush Dec 2001

Fat Supplementation For Beef Cows, Ivan G. Rush

Range Beef Cow Symposium

It has long been known that adequate energy is required for high reproduction in beef cows. Historically, most high energy supplements contained starch from grains such as corn, barley, etc., which may cause some negative effects on forage digestion when fed at relatively high levels. This is especially true when the ration is deficient in protein. An alternative to energy supplementation is utilizing plant and animal fat, which are much higher in energy than grains such as corn or barley. Early research has shown that very high levels of fat in the diet (in excess of 6-8% fat in the ...


The Role Of Undegradable Intake Protein In Management Of The Young Beef Female, Trey Patterson Dec 2001

The Role Of Undegradable Intake Protein In Management Of The Young Beef Female, Trey Patterson

Range Beef Cow Symposium

Reproductive failure in young cows is expensive to many beef operations in the Northern Great Plains. Scientists, nutritionists, and producers have typically placed great effort into heifer development and mature cow management at the expense of two- and three-year-old cows. Meek et al. (1999), working with a ranch in the Nebraska Sandhills, found that the net present value (current animal value accounting for time value of money) of beef females peaked at four years old. Why were bred heifers and pregnant two-year-olds not more valuable than four-year-old cows? Reproductive failure in the young cows did not allow them to stay ...


Economics Of Young Female Management, Dillon M. Feuz Dec 2001

Economics Of Young Female Management, Dillon M. Feuz

Range Beef Cow Symposium

What is the value of a heifer calf, a bred heifer, or a re-bred 2nd calf cow? How does that value compare to the current market price? What is your cost of raising a heifer calf, bred heifer, or re-bred 2nd calf cow? How many pencils have been worn dull or how many spreadsheets have been created to answer these questions? The unrealistic objective of this paper is to answer these questions. Perhaps a more realistic objective is to answer some of these questions and to provide you the framework to answer some of the questions for your own operation ...


What Are We Doing To Prevent Entry Of Potentially Catastrophic Foreign Animal Diseases Into The Usa, Gary C. Smith Dec 2001

What Are We Doing To Prevent Entry Of Potentially Catastrophic Foreign Animal Diseases Into The Usa, Gary C. Smith

Range Beef Cow Symposium

What are Foreign Animal Diseases? By definition, a Foreign Animal Disease (FAD) is one which originates in another country and can, or does, enter the USA. An agency of our federal government, the Animal and Plant Health Inspection Service (APHIS) of the U.S. Department of Agriculture (USDA), is charged with responsibility for preventing entry of FADs into our country and is especially vigilant regarding those FADs which would have potentially catastrophic effects on farm-animal populations, the agricultural economy and/or the public (human) health. Activities of APHIS specifically related to FADs include (USDA/APHIS, 2001): (a) Guarding our borders ...


Packing Industry Innovations As We Move To The Future?, H. Glen Dolezal Dec 2001

Packing Industry Innovations As We Move To The Future?, H. Glen Dolezal

Range Beef Cow Symposium

The beef industry has overcome numerous challenges in the past and has adopted and implemented new and innovative ideas to improve beef demand. A key change in the beef industry philosophy has been the switch from a mindset of commodity production to one of consumer focus for product safety, quality, convenience, and price point. The packing industry is well known for adopting technology. As we move into the future, technological advancements will continue in food safety and processing, as well as vision grading, case-ready solutions, value-added products, and product quality. Hopefully, these improvements will be made in cooperation with producers ...


Beef Market Outlook, Randy Blach Dec 2001

Beef Market Outlook, Randy Blach

Range Beef Cow Symposium

Beef Business Facts:

1. The beef industry is changing rapidly

2. Competition will be tougher and margins will narrow

3. Risk is increasing

4. Approaches to marketing are changing

5. An increased percentage of beef will be sold under a brand name

6. Environmental and food safety issues will increase

7. General observations


Leasing Arrangements For Cattle, Richard T. Clark, Duane Griffith, Kevin Dhuyvetter, Damona Doye Dec 2001

Leasing Arrangements For Cattle, Richard T. Clark, Duane Griffith, Kevin Dhuyvetter, Damona Doye

Range Beef Cow Symposium

Agriculturists have long used leasing arrangements as a means of farming or ranching with more than owned resources. Most commonly, land has been leased, but other resources can be acquired in a similar manner. Beef cows are leased between parties on either a cash or share of calf crop basis, but share leases seem to be predominant. Bulls, when not part of a cow share agreement, are primarily leased for cash.

Leasing arrangements may be considered in several situations. Producers can use leases, calf share in particular, to transfer ownership of cows to others over time with possibly less income ...


National Market Cow And Bull Beef Quality Audit - 1999, Deborah Roeber, Keith E. Belk, Thomas G. Field, John A. Scanga, Gary L. Cowman, Gary C. Smith Dec 2001

National Market Cow And Bull Beef Quality Audit - 1999, Deborah Roeber, Keith E. Belk, Thomas G. Field, John A. Scanga, Gary L. Cowman, Gary C. Smith

Range Beef Cow Symposium

The National Non-Fed Beef Quality Audit – 1994 (NNFBQA-94) was conducted to benchmark the quality characteristics of market cows and bulls in the beef and dairy industries for purposes of encouraging implementation of quality management practices within the beef industry. From this audit, it was determined that producers were losing $69.90 for each market cow and bull harvested due to quality defects. As a means of recovering the lost value, producers were provided three means by which they could begin to recapture the lost value: 1) Manage market cows and bulls to minimize defects and quality deficiencies, 2) Monitor the ...


Purchasing Versus Raising Replacement Females: To Outsource Or Not To Outsource?, Jack C. Whittier Dec 2001

Purchasing Versus Raising Replacement Females: To Outsource Or Not To Outsource?, Jack C. Whittier

Range Beef Cow Symposium

The beef cattle industry is experiencing changes in the way it does business. Some have suggested that there is more change occurring now than in any other period of the industry’s history. Among these changes are indications, driven by real incentives, that more uniformity of production is evolving. Alliances and coordinated supply systems are developing that suggest - even specify - certain genetic and production parameters for those who supply calves into their production programs.

Establishing and maintaining a logical, economical, practical and effective system for replenishing the cowherd is a necessary (some would say a necessary evil) component of producing ...


Muscle Profiling, Chris R. Calkins Dec 2001

Muscle Profiling, Chris R. Calkins

Range Beef Cow Symposium

In the mid-90's, Cattle Fax released some alarming data. They showed that over the previous 5-year period the value of the beef rib and loin had increased by just 3-4% while the value of the chuck and round had dropped by 24-25%. Given that these later two primals make up the more than 56% of the carcass, it was clear that dramatic action was needed to reverse the trend. Increasing the value of the chuck and round meant knowing more about the muscles which comprise these cuts. Therefore, the University of Nebraska and the University of Florida joined together ...


Environmental Challenges For The Ranching Community, Ron Micheli Dec 2001

Environmental Challenges For The Ranching Community, Ron Micheli

Range Beef Cow Symposium

My grandfather used to love to tell the story of a preacher who came to the ranch to visit. “My goodness, Joe, you have a beautiful place,” said the minister. “The green grass blowing in the wind, the cottonwood trees filled with singing birds, the abundant wildlife, and the sparkling streams, it is amazing what you and the good Lord have done.”

“Yes,” my grandfather said, “It is beautiful. But you should have seen it when the Lord was doing it by himself.”

There is a great message in that story. Man can improve the environment. Man can enhance mother ...


Beyond The Borders: International Marketing Developments And The Effects On Cattle Producers, Wendy Radakovich Dec 2001

Beyond The Borders: International Marketing Developments And The Effects On Cattle Producers, Wendy Radakovich

Range Beef Cow Symposium

The international market for U.S. beef has grown dramatically in the past decade to the benefit of beef producers. In 1990 U.S. beef and beef variety meat exports amounted to 508,109 metric tons worth $1.88 billion. By 2000 U.S. beef and beef variety exports grew to 1,237,000 metric tons worth $3.6 billion.

Why is the international market important to beef producers? There are several examples that demonstrate the importance of the export market to U.S. beef producers. U.S. beef exports represented 13% of production in 2000. This is equivalent to ...


Vertical Communication: The Aligning Of Beef Industry Segments, Charlie Peters Dec 2001

Vertical Communication: The Aligning Of Beef Industry Segments, Charlie Peters

Range Beef Cow Symposium

Relative to competing proteins, the beef industry has lagged in its ability to integrate productions segments. The inherent nature of protein production from ruminants dictates that some obstacles to vertical integration in the beef industry are relatively permanent in nature. Simply the vast differences in environments across the country and the way seedstock producers, cow-calf producers, backgrounders and feedyards respond by implementing more localized production and management practices creates a setting where “one-size-fits-all” is virtually impossible. True vertical integration requires control from start to finish. Control from start to finish of production and marketing occurs most readily with complete ownership ...


Vertical Communication: The Aligning Of Beef Industry Segments, Larry Corah, Steve Suther Dec 2001

Vertical Communication: The Aligning Of Beef Industry Segments, Larry Corah, Steve Suther

Range Beef Cow Symposium

Cow-calf producers can count on erratic weather, day-to-day market swings and continuing changes in everything else that affects them. In the last five or six years especially, structural and technological changes in the industry occurred so rapidly as to seem more threatening than those more familiar variables of weather and markets. But there is a silver lining to this storm of change: you can ride it out and come out on top if you understand it and take action.

Consolidation in the feedlot, retail, food service and packing segments has caused many cow-calf and stocker operations to ask that basic ...


Vertical Communication: The Aligning Of The Beef Industry Segments, Dave True Dec 2001

Vertical Communication: The Aligning Of The Beef Industry Segments, Dave True

Range Beef Cow Symposium

During this presentation, I hope to convey why True Ranches, a family owned cow/calf producer and feeder in Wyoming has joined forces with Future Beef Operations (FBO). In brief summary, we believe that True Ranches fits well with FBO’s strategy and there is a clear, well identified target towards which the entire system is striving.