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1994

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Articles 1 - 30 of 1726

Full-Text Articles in Life Sciences

Effects Of 17Β-Estradiol On Distribution Of Pituitary Isoforms Of Luteinizing Hormone And Follicle-Stimulating Hormone During The Follicular Phase Of The Bovine Estrous Cycle, F. N. Kojima, Andrea S. Cupp, T. T. Stumpf, D. D. Zalesky, M. S. Roberson, L. A. Werth, M. W. Wolfe, Roger J. Kittok, H. E. Grotjan, J. E. Kinder Dec 1994

Effects Of 17Β-Estradiol On Distribution Of Pituitary Isoforms Of Luteinizing Hormone And Follicle-Stimulating Hormone During The Follicular Phase Of The Bovine Estrous Cycle, F. N. Kojima, Andrea S. Cupp, T. T. Stumpf, D. D. Zalesky, M. S. Roberson, L. A. Werth, M. W. Wolfe, Roger J. Kittok, H. E. Grotjan, J. E. Kinder

Faculty Papers and Publications in Animal Science

The objective of this study was to examine the influence of 17β-estradiol (E2) on distribution of LH and FSH isoforms during the follicular phase of the bovine estrous cycle prior to the preovulatory surges of LH and FSH. On Day 16 of the estrous cycle (Day 0 = estrus), intact controls (CONT; n = 4) were treated with prostaglandin F (PGF) to induce luteal regression and initiation of the follicular phase. Other cows were also treated with PGF and either ovariectomized (OVX; n = 5) or ovariectomized and given E2 implants (OVXE; n = 6) to mimic the pattern ...


Changes In Plant Variety Protection, Neil Harl Dec 1994

Changes In Plant Variety Protection, Neil Harl

Agricultural Law Digest

Since enactment in 1970, the Plant Variety Protection Act had received relatively little attention until the litigation relating to the "saved seed" exception commenced in 1991. That case, Asgrow Seed Co. v. Winterboer, is before the U.S. Supreme Court with a decision expected some time in 1995.

The Congress has now passed and the President has signed legislation amending the 1970 act which reverses, statutorily, the U.S. Court of Appeals decision in Asgrow Seed Co. v. Winterboer and makes several other changes in the Plant Variety Protection Act.


Cases, Regulations And Statutes, Robert P. Achenbach Jr. Dec 1994

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

Agricultural Law Digest

No abstract provided.


Cropwatch No. 94-24-2, Dec. 16, 1994, Lisa Brown Jasa Dec 1994

Cropwatch No. 94-24-2, Dec. 16, 1994, Lisa Brown Jasa

Crop Watch

Inside

1994 index .......................... 164

Grants for producers .......... 166

CropWatch order form........ 167

Annual survey .................... 167


Agricultural And Food Policy Preferences: The 1994 Perspectives Of South Dakota Agricultural Producers, Bashir Qasmi, John A. Sondey Dec 1994

Agricultural And Food Policy Preferences: The 1994 Perspectives Of South Dakota Agricultural Producers, Bashir Qasmi, John A. Sondey

Economics Research Reports

U.S. farm policies are reviewed, every five years concurrent with the drafting of new farm legislation. The present farm bill expires in 1995, and a new bill will be debated and enacted in 1995. Since farm and food policies have a major impact on farmers, information on their preferences with regard to these policies are invaluable to legislators as well as to different advocacy groups (working for farmers). The research was completed as a part of a 15 state study to document the agricultural and food policy preferences by agricultural producers. This report deals with the policy preferences of ...


Northeast Research Station Watertown, South Dakota Annual Progress Report, 1994, Agricultural Experiment Station, Plant Science Department Dec 1994

Northeast Research Station Watertown, South Dakota Annual Progress Report, 1994, Agricultural Experiment Station, Plant Science Department

Agricultural Experiment Station and Research Farm Annual Reports

This is the 1994 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 1994 crop season, including: precipitation summary, crop performance trials, oat research forage yields, soybean breeding, various fungicide testing, weed control.


More On Related Party Sales, Neil Harl Dec 1994

More On Related Party Sales, Neil Harl

Agricultural Law Digest

In the April 29, 1994, Agricultural Law Digest, we examined the subject of related party sales with emphasis on the rules governing sales of depreciable property between related persons and related party sales where the buyer resells the property within two years. Because of the interest in the topic, particularly involving the sale of livestock held for breeding and dairy purposes, this article explores additional features of the general problem of related party sales.


Cases, Regulations And Statutes, Robert P. Achenbach Jr. Dec 1994

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

Agricultural Law Digest

No abstract provided.


Indicators Of Nutrient Limited Plankton Growth In Lakes Near Mount Saint Helens, Washington, Kurt Davis Carpenter Dec 1994

Indicators Of Nutrient Limited Plankton Growth In Lakes Near Mount Saint Helens, Washington, Kurt Davis Carpenter

Dissertations and Theses

Several lakes located in the blast zone of the 1980 eruption of Mount St. Helens were studied to determine if the plankton in the lakes were limited in their growth by nitrogen or phosphorus availability. Long term nutrient enrichment experiments were performed on lake water from five lakes and measures of chlorophyll-a, carbon fixation, and nutrient uptake were used to evaluate the extent of limitation. Nutrient concentrations, ratios, and uptake from 14 lakes provided additional evidence for limitation by nitrogen and/or phosphorus. The physical, chemical, and biological characteristics of the lakes were also examined to monitor the return of ...


Daughter Cells Of Saccharomyces Cerevisiae From Old Mothers Display A Reduced Life Span, Nicanor Austriaco, Brian K. Kennedy, Leonard Guarente Dec 1994

Daughter Cells Of Saccharomyces Cerevisiae From Old Mothers Display A Reduced Life Span, Nicanor Austriaco, Brian K. Kennedy, Leonard Guarente

Biology Department Faculty Publications

The yeast Saccharomyces cerevisiae typically divides asymmetrically to give a large mother cell and a smaller daughter cell. As mother cells become old, they enlarge and produce daughter cells that are larger than daughters derived from young mother cells. We found that occasional daughter cells were indistinguishable in size from their mothers, giving rise to a symmetric division. The frequency of symmetric divisions became greater as mother cells aged and reached a maximum occurrence of 30% in mothers undergoing their last cell division. Symmetric divisions occurred similarly in rad9 and ste12 mutants. Strikingly, daughters from old mothers, whether they arose ...


Pronominal Clitics In Québec Colloquial French: A Morphological Analysis, Julie Auger Dec 1994

Pronominal Clitics In Québec Colloquial French: A Morphological Analysis, Julie Auger

IRCS Technical Reports Series

The grammatical status of Romance pronominal clitics has long been the object of intense debate. Are they syntactically-independent arguments or are they affixal agreement markers? This dissertation addresses this question with respect to Québec Colloquial French (QCF). It treats the morphophonological and morphosyntactic dimensions as two independent dimensions, thus allowing either for affixes to have argument status and prohibiting them from co-occurring with an overt, lexical argument, or for non-affixal elements to behave like agreement markers and not count as syntactic arguments. The analysis reveals that all the clitics of QCF are affixes at the morphological level, since they demonstrate ...


Factors Influencing The Oxidation Of Lipoproteins And Plasma Lipids, Yanshan Ma Dec 1994

Factors Influencing The Oxidation Of Lipoproteins And Plasma Lipids, Yanshan Ma

Electronic Theses and Dissertations

The hypothesis that antioxidant vitamins (ascorbate and tocopherols) along with urate protect blood plasma lipids from oxidation was tested. Dietary fat is also an important factor influencing plasma lipid peroxidation. The purpose of this study was to investigate the role of plasma antioxidants and dietary fat on low density lipoprotein (LDL) and plasma lipid oxidation. In the first part of this study, we compared the ability of urate and ascorbate to protect human LDL from in vitro oxidation. LDL oxidation was initiated by 15 mM of a water soluble azo-initiator in the presence or absence of ascorbate or urate. The ...


Microcirculation: Electrophysiological Basis For The Response Of Endothelial Cells To Inflammatory Mediators-Bradykinin, Kai Miao Dec 1994

Microcirculation: Electrophysiological Basis For The Response Of Endothelial Cells To Inflammatory Mediators-Bradykinin, Kai Miao

Electronic Theses and Dissertations

Using conventional microelectrodes, I studied the electrical basis for determining the resting V$\sb{\rm m}$ in intact EC's from hamsters. The resting V$\sb{\rm m}$ were found to be $-$40 mV for aortic EC's and $-$43 mV for vena caval EC's. The contributions of ions to the resting V$\sb{\rm m}$ of aortic EC's were compared in terms of the transference number (t$\sb{\rm ion}$). To develop a technique for in situ monitoring changes in V$\sb{\rm m}$ of postcapillary venular EC's in the hamster mesentery, a voltage-sensitive fluorescent probe ...


Role Of The Cd40-Cd40 Ligand Interaction In Cd4(+) T Cell Activation Of Monocyte Interleukin-1 Synthesis, David H. Wagner Dec 1994

Role Of The Cd40-Cd40 Ligand Interaction In Cd4(+) T Cell Activation Of Monocyte Interleukin-1 Synthesis, David H. Wagner

Electronic Theses and Dissertations

Most studies of the induction of cytokine synthesis in monocytes have used an exogenous triggering agent such as Lipolpoysaccharide (LPS). However, during nonseptic chronic inflammatory responses (e.g., rheumatoid arthritis) monocyte activation occurs as a result of T cell generated signals. This report demonstrated that plasma membranes from anti-CD3 activated peripheral CD4$\sp{+}$ T cells (Tm$\sp{\rm A}$) but not from resting CD4$\sp{+}$ cells (Tm$\sp{\rm R}$) induced monocytes to synthesize IL-1 in the absence of costimulatory cytokines. The expression kinetics of the molecule(s) unique to activated T cells which interact with monocyte receptors to induce ...


The Effects Of Elevated Glucose Upon Na+/K+-Atpase In Bovine Retinal Pigment Epithelial Cells, Julie Y. Crider Dec 1994

The Effects Of Elevated Glucose Upon Na+/K+-Atpase In Bovine Retinal Pigment Epithelial Cells, Julie Y. Crider

Theses and Dissertations

Crider, Julie Y., The Effects of Elevated Glucose Upon Na+/K+-ATPase in Bovine Retinal Pigment Epithelial Cells. Doctor of Philosophy (Biomedical Sciences, Pharmacology), December, 1994, 154 pp., 14 tables, 31 illustrations, bibliography, 288 titles. Bovine retinal pigment epithelial (RPE) cells were cultured under 1, 4.5 and 10 g/l glucose conditions in order to characterize the effects of hyperglycemia upon Na+/K+-ATPase. Functional activity of Na+/K+-ATPase was measured as ouabain-sensitive Rb+ uptake. 3H ouabain was used to assess binding characteristics of Na+/K+-ATPase. The major contributors to rubidium (mRb+) uptake activity were the ouabain-sensitive ...


Native Vegetation Handbook For The Shire Of Tammin, Sarah J. Weaving Dec 1994

Native Vegetation Handbook For The Shire Of Tammin, Sarah J. Weaving

Native vegetation handbook series

This booklet provides land managers with information relating to the natural resources of the Shire of Tammin including the existing vegetation, drainage systems and soils. Some of the problems relating to the management of natural vegetation resources in the Shire of Tammin and possible solutions to these problems are also discussed. By providing this information it is hoped this booklet will contribute to the long term viability of the agricultural landscape and the conservation of native vegetation within the Shire.


Native Vegetation Handbook For The Shire Of Wyalkatchem, Sarah J. Weaving Dec 1994

Native Vegetation Handbook For The Shire Of Wyalkatchem, Sarah J. Weaving

Native vegetation handbook series

This booklet provides land managers with information relating to the natural resources of the Shire of Wyalkatchem including the existing vegetation, drainage systems and soils. Some of the problems relating to the management of natural vegetation resources in the Shire of Wyalkatchem and possible solutions to these problems are also discussed. Provision of this information will contribute to the long term viability of the agricultural landscape and the conservation of native vegetation within the Shire.


Native Vegetation Handbook For The Shire Of York, Sarah J. Weaving Dec 1994

Native Vegetation Handbook For The Shire Of York, Sarah J. Weaving

Native vegetation handbook series

This booklet provides rural communities with information relating to the natural resources of the Shire of York including the original and existing vegetation, fauna and flora, drainage systems, topography and soils. Some of the problems relating to the management of natural vegetation resources in the Shire of York and community initiatives to address these problems are also discussed. It is hoped that this information will contribute to the long term viability of the agricultural landscape and the conservation of native vegetation within the Shire.


Research Report No. 32, Trends Of Non-Straight Tree Stems In Loblolly And Slash Pine Plantations In East Texas, 1985-1994, H. Alexis Ross, J. David Lenhart Dec 1994

Research Report No. 32, Trends Of Non-Straight Tree Stems In Loblolly And Slash Pine Plantations In East Texas, 1985-1994, H. Alexis Ross, J. David Lenhart

Informal Project Reports

Trees from East Texas loblolly ( Pinus taeda L. ) and slash ( Pinus effiottii Engelm. ) pine plantations are one of the sources of raw material for conversion into products such as paper, veneer and lumber by East Texas forest product mills. The utilization of the planted trees may depend on various biological and economical factors. Factors such as tree size, tree condition, stumpage prices and interest rates can play a role in the merchandizing process.

One of the factors, tree condition, may be affected by tree crown position in canopy, incidence of disease, single stem and straightness of stem. Trees with straighter ...


Southeast South Dakota Experiment Farm Annual Progress Report, 1994, Agricultural Experiment Station Dec 1994

Southeast South Dakota Experiment Farm Annual Progress Report, 1994, Agricultural Experiment Station

Agricultural Experiment Station and Research Farm Annual Reports

This thirty-fourth annual report of the research program at the Southeast South Dakota Experiment Farm has special significance for those engaged in agriculture and the agriculturally related businesses in the nine county area of southeast South Dakota. Reports in this document include information on: temperatures and precipitation data, corn production and performance, soybean research and planting, soil testing, alfalfa yield test, fertilizer testing, herbicide research, crop rotation, sorghum, small grains, livestock research, and pest and weed control.


Weed Resistance Assessment Program (Wrap), Bob Hartzler Dec 1994

Weed Resistance Assessment Program (Wrap), Bob Hartzler

Proceedings of the Integrated Crop Management Conference

The phenomena of herbicide resistance is not a new concern; triazine resistant weeds were first reported in the late 1960's. Since then, resistance has developed to many other important classes of herbicides. Although there are isolated infestations of triazine resistant weeds across Iowa, these weeds are not considered a major problem in the state. Recent shifts in herbicide use patterns has increased the potential for the development of resistant biotypes. This paper will describe factors which influence the development of resistance and how weed management programs can be manipulated to minimize the potential for resistance.


The Positive Impact Of Agricultural Professionals On Health And Safety Changes Among Farmers, Carol J. Lehtola Dec 1994

The Positive Impact Of Agricultural Professionals On Health And Safety Changes Among Farmers, Carol J. Lehtola

Proceedings of the Integrated Crop Management Conference

This workshop presents examples of program results and applications that indicate farmers are willing to purchase safety equipment and develop safer working practices. Many of these interventions for improving farmers' safety have been promoted and endorsed by the ag professionals who work directly with farmers. Case study examples show how ag professionals are playing a positive and active role towards improving the safety and health of Iowa's farm families.


Foliar Fungicides In Seed Corn Production, C. A. Martinson, F. W. Nutter Jr., Stephen N. Wegulo, J. M. Rivera C. Dec 1994

Foliar Fungicides In Seed Corn Production, C. A. Martinson, F. W. Nutter Jr., Stephen N. Wegulo, J. M. Rivera C.

Proceedings of the Integrated Crop Management Conference

Since 1982, we have conducted a program to determine the fungicides that may be effective for controlling foliar diseases in inbred and hybrid com. For the past seven years we have limited our research to only inbreds or sister line hybrids. In 1990, we started a cooperative program with seed companies and have conducted our research in commercial seed production fields in five greatly different years in terms of weather patterns. Thirty experiments have been established in seed production fields and 25 fields have been harvested for yield. Five experiments were abandoned because of herbicide injury interactions (2,4-D) with ...


Lighting And Marking Farm Equipment, H. Mark Hanna, Charles V. Schwab, Carol J. Lehtola, Richard W. Steffen Dec 1994

Lighting And Marking Farm Equipment, H. Mark Hanna, Charles V. Schwab, Carol J. Lehtola, Richard W. Steffen

Proceedings of the Integrated Crop Management Conference

Agriculture is one of the most hazardous occupations in the United States as determined by death rates. Excluding persons under 14 years of age, the National Safety Council (1993) estimates there were 37 deaths per 100,000 agricultural workers in 1992. Farm machinery and motor vehicles being used for farm related purposes are often involved in accidental agricultural deaths. The classes of injury causing agent with the greatest frequency of accidental occupational farm fatalities during 1992 in Iowa were tractors, machinery, and motor vehicles {IDPH, 1993). Together these three classes accounted for 64 percent of 83 recorded fatalities. Thirty-one percent ...


No-Till And Soybean Diseases In Iowa, X. B. Yang, Fekede Workneh, Gregory Tylka Dec 1994

No-Till And Soybean Diseases In Iowa, X. B. Yang, Fekede Workneh, Gregory Tylka

Proceedings of the Integrated Crop Management Conference

Conventional tillage methods are effective means of controlling plant disease because completely burying crop residues destroys plant pathogens and breaks disease cycles (Boosalis et al, 1986). Today, cropping practices are shifting to surface-tillage systems to offset the rising cost of production and to comply with USDA/ ASCS mandatory soil conservation requirements which have a deadline of 1 January 1995. The percentage of no-till soybean fields in Iowa was 19% of total acreage in 1993. It is predicted that the total acreage of conservation tillage in Iowa will increase to 11 million acres by 1995. Because conservation tillage practices leave crop ...


Transgenic Bt Corn: Is This The Future Of Insect Pest Management?, Marlin E. Rice, John J. Obrycki, William B. Showers Dec 1994

Transgenic Bt Corn: Is This The Future Of Insect Pest Management?, Marlin E. Rice, John J. Obrycki, William B. Showers

Proceedings of the Integrated Crop Management Conference

In a few short years, it is expected that a dramatically different management tactic will be ready for field corn producers to combat the ravages of the European com borer. This new tactic currently goes by a variety of names including genetically-engineered com, transgenic com, Bt com, or transgenic Bt com. But whatever name eventually is used, it offers a hope that biotechnology will deliver a corn plant that is resistant to leaf feeding, stalk tunneling, dropped ears and reduced grain yields caused by the European corn borer.


Production And Marketing Of Specialty Soybeans, Walter R. Fehr Dec 1994

Production And Marketing Of Specialty Soybeans, Walter R. Fehr

Proceedings of the Integrated Crop Management Conference

The soybean breeding project at Iowa State University has been involved in the development of soybean cultivars for specific end uses for more than 40 years. The initial objective was to develop cultivars with unique characteristics for food products, including tofu, miso, and vegetable soybeans. In the late 1960's, research began at Iowa State on the development of cultivars with modified oil composition. Until the 1980's, the interest of other public institutions and of private companies in breeding specialty cultivars was limited. The situation changed dramatically in the 1980's as more breeders in the public and private ...


The 1994 Iowa Crop- Did We Get It Right?, Garren O. Benson Dec 1994

The 1994 Iowa Crop- Did We Get It Right?, Garren O. Benson

Proceedings of the Integrated Crop Management Conference

The answer to the question raised in the title is yes. The October Crop Report estimated Iowa corn and soybean yields at 150 and 51 bu/ac respectively. If maintained in the November and January reports both yields would be records. The prior corn record was 147 bu/ ac in 1992. The soybean yield is an incredible 7 bu/ ac over the previous record of 44 bu/ac set in 1992. If 1994 yield estimates fit historic patterns, the final estimate in January may be even higher than those indicated in Table 1. The 1994 crop is a complete reversal ...


Diseases Of Corn And Soybeans In 1994, Gary P. Munkvold Dec 1994

Diseases Of Corn And Soybeans In 1994, Gary P. Munkvold

Proceedings of the Integrated Crop Management Conference

Growing conditions in 1994 were quite favorable overall, but the variability of weather this year resulted in some areas with substantially wetter or drier than normal conditions for some portion of the season. Serious disease problems are often associated with weather conditions outside the norms. Some diseases can be expected to appear almost every year, and 1994 was typical in regard to some of the common corn and soybean diseases. In corn, there were some problems with Fusarium crovm rot, common smut, northern leaf blight, Gibberella ear rot and stalk rots caused by Gibberella zeae and Colletotrichum graminicola {anthracnose). However ...


Managing Insects On Fresh Market Sweet Corn, Rick Foster Dec 1994

Managing Insects On Fresh Market Sweet Corn, Rick Foster

Proceedings of the Integrated Crop Management Conference

The key to sweet corn pest management is the awareness of the interaction of plant phenology and insect activity, which produces "windows of vulnerability." In most areas of the Midwest, the planting period for sweet corn extends over several months, as does harvest. Sweet corn fields are surrounded by a much larger acreage of field corn that is planted during a short period in the spring and harvested in the fall, usually after sweet corn has been harvested. Insects may leave field corn and select sweet corn as a more attractive host as field corn dries down.