RISK RESEARCH AND PUBLIC OUTREACH: A TALE OF TWO CULTURES?

Agricultural economists have been challenged in recent years, by voices inside and outside the profession, to evaluate the integrity of the operational bridge between research and extension activities in the land grant system. This essay investigates links between the work of risk researchers and outreach programs. Survey results indicate that (a) a significant number of risk researchers are involved in extension activities; (b) extension economists are less frequently involved in risk research than their colleagues with no extension appointment; (c) full-time extension economists use less sophisticated risk tools in their outreach efforts than used in their research; and (d) all respondents, regardless of appointment, see a need for more applied risk analysis. Major challenges include a lack of financial support to close the data gap and to conduct relevant applied analysis present major communication challenges.Teaching/Communication/Extension/Profession,

SUGGESTED PROCEDURES FOR ESTIMATING FARM MACHINERY COSTS FOR EXTENSION AUDIENCES

North Central Farm Machinery Task Force is a group of extension economists who evaluated alternative methods for estimating farm machinery costs and made recommendations for the development of extension materials. This paper describes the procedures agreed upon, and explains the rationale for the procedures chosen. The focus is on "typical" machinery costs for use in extension budgets and other analyses and examples. This paper also provides detailed documentation of the methods used in recent versions of the widely used Minnesota Farm Machinery Economic Cost Estimates publication (referred to below as "the Minnesota fact sheet"), focusing mainly on the 2000 version.Agricultural Finance, Farm Management,

EC96-872-S Nebraska Crop Budgets 1996

Extension Circular 96-872-S: Nebraska Crop Budgets-1996

The structure of gravel-bed flow with intermediate submergence: a laboratory study

The paper reports an experimental study of the flow structure over an immobile gravel bed in open channel at intermediate submergence, with particular focus on the near-bed region. The experiments consisted of velocity measurements using three-component (stereoscopic) Particle Image Velocimetry (PIV) in near-bed horizontal plane and two-component PIV in three vertical planes that covered three distinctly different hydraulic scenarios where the ratio of flow depth to roughness height (i.e., relative submergence) changes from 7.5 to 10.8. Detailed velocity measurements were supplemented with fine-scale bed elevation data obtained with a laser scanner. The data revealed longitudinal low-momentum and high-momentum "strips'' in the time-averaged velocity field, likely induced by secondary currents. This depth-scale pattern was superimposed with particle-scale patches of flow heterogeneity induced by gravel particle protrusions. A similar picture emerged when considering second-order velocity moments. The interaction between the flow field and gravel-bed protrusions is assessed using cross correlations of velocity components and bed elevations in a horizontal plane just above gravel particle crests. The cross correlations suggest that upward and downward fluid motions are mainly associated with upstream-facing and lee sides of particles, respectively. Results also show that the relative submergence affects the turbulence intensity profiles for vertical velocity over the whole flow depth, while only a weak effect, limited to the near-bed region, is noticed for streamwise velocity component. The approximation of mean velocity profiles with a logarithmic formula reveals that log-profile parameters depend on relative submergence, highlighting inapplicability of a conventional "universal'' logarithmic law for gravel-bed flows with intermediate submergence

Exploration of bivalent ligands targeting putative mu opioid receptor and chemokine receptor CCR5 dimerization

Modern antiretroviral therapies have provided HIV-1 infected patients longer lifespans and better quality of life. However, several neurological complications are now being seen in these patients due to HIV-1 associated injury of neurons by infected microglia and astrocytes. In addition, these effects can be further exacerbated with opiate use and abuse. One possible mechanism for such potentiation effects of opiates is the interaction of the mu opioid receptor (MOR) with the chemokine receptor CCR5 (CCR5), a known HIV-1 co-receptor, to form MOR-CCR5 heterodimer. In an attempt to understand this putative interaction and its relevance to neuroAIDS, we designed and synthesized a series of bivalent ligands targeting the putative CCR5-MOR heterodimer. To understand how these bivalent ligands may interact with the heterodimer, biological studies including calcium mobilization inhibition, binding affinity, HIV-1 invasion, and cell fusion assays were applied. In particular, HIV-1 infection assays using human peripheral blood mononuclear cells, macrophages, and astrocytes revealed a notable synergy in activity for one particular bivalent ligand. Further, a molecular model of the putative CCR5-MOR heterodimer was constructed, docked with the bivalent ligand, and molecular dynamics simulations of the complex was performed in a membrane-water system to help understand the biological observation

PepSeeker: a database of proteome peptide identifications for investigating fragmentation patterns

Proteome science relies on bioinformatics tools to characterize proteins via their proteolytic peptides which are identified via characteristic mass spectra generated after their ions undergo fragmentation in the gas phase within the mass spectrometer. The resulting secondary ion mass spectra are compared with protein sequence databases in order to identify the amino acid sequence. Although these search tools (e.g. SEQUEST, Mascot, X!Tandem, Phenyx) are frequently successful, much is still not understood about the amino acid sequence patterns which promote/protect particular fragmentation pathways, and hence lead to the presence/absence of particular ions from different ion series. In order to advance this area, we have developed a database, PepSeeker (), which captures this peptide identification and ion information from proteome experiments. The database currently contains >185 000 peptides and associated database search information. Users may query this resource to retrieve peptide, protein and spectral information based on protein or peptide information, including the amino acid sequence itself represented by regular expressions coupled with ion series information. We believe this database will be useful to proteome researchers wishing to understand gas phase peptide ion chemistry in order to improve peptide identification strategies. Questions can be addressed to [email protected]

EC94-872-S Nebraska Crop Budgets

Resource Persons • Crops Budgeting Procedure • Prices Used for 1994 Panhandle • Gravity Irrigated Crops • Sugar Beets • Dry Edible Beans • Corn for Grain • Corn for Silage • Establish Alfatfa with Oats • Alfalfa Hay Gravity Irrigated • Center Pivot Irrigated Crops • Sugar Beets • Dry Edible Beans • Corn for Grain • Winter Wheat • Alfalfa Hay • Non-Irrigated Crops • Winter Wheat Stubble Much Fallow • Winter Wheat, Eco-Fallow (Chemical and Tillage Combination) • Sunflower, Wheat-Sunflower-Fallow Rotation • Millet, Wheat, Fallow, Millet, Fallow Southwest • Corn for Grain, Gravity Irrigated • Corn for Silage, Gravity Irrigated • Corn for Grain, Ditch Irrigated, Platte Valley • Corn for Grain, Ridge Planted, Gravity Irrigated • Corn for Grain, Center Pivot Irrigated, Fine Texture Soil • Corn for Grain, Center Pivot Irrigated, Sandy Soil • Pinto Beans, Center Pivot Irrigated • Soybeans, Center Pivot Irrigated • Fall Seed Alfalfa, Center Pivot Irrigated • Alfalfa Hay, Center Pivot Irrigated • Alfalfa Hay, Sub-Irrigated, Platte Valley • Fall Seed Grass, Center Pivot Irrigated • Pasture, Center Pivot Irrigated • Wheat, Center Pivot Irrigated • Wheat, Stubble Mulch Fallow • Wheat, Clean Till Fallow • Wheat, Continuous, Chemical Weed Control • Wheat, Followed by Corn, 3 Year Rotation, Eco-Fallow • Corn, Following Eco-Fallow Wheat • Grain Sorghum, Non-Irrigated • Grain Sorghum, Non-Irrigated, No-TUI Continuous • Cane Hay, Non-Irrigated North • Corn for Grain, Center Pivot Irrigated • Corn for Silage, Center Pivot Irrigated • Establish Alfalfa, Center Pivot Irrigated • Alfalfa Hay, Center Pivot Irrigated • Establish Grass, Center Pivot Irrigated • Pasture, Center Pivot Irrigated • Native Hay, Wet Meadow • Native Hay, Upland Central • Corn for Grain Center Pivot Irrigated • Corn for Silage Center Pivot Irrigated • Grain Sorghum for Grain, Limited Irrigation, Center Pivot • Corn for Grain, Gravity Irrigated • Corn for Silage Gravity Irrigated • Soybeans, Gravity Irrigated , • Establish Alfalfa, Gravity Irrigated • Alfalfa for Hay, Gravity Irrigated • Corn for Grain, Non-Irrigated • Corn for Grain, Eco-Fallow, Follows Wheat in 3 Year Rotation • Corn for Silage, Non-Irrigated • Grain Sorghum for Grain, Non-Irrigated • Grain Sorghum for Grain, Eco-Fallow, Follows Wheat in 3 Year Rotation • Grain Sorghum for Grain, Continuous, No Till, Non-Irrigated • Soybeans, Non-Irrigated • Wheat for Grain, Continuous Cropped, Non-Irrigated • Wheat for Grain, Continuous, No Till, Non-Irrigated • Wheat for Grain, Fallow Every Third Year • Establish Alfalfa, Non-Irrigated • Alfalfa for Hay, Non-Irrigated • Establish and Maintain Cover Crop on Set Aside Acres Northeast • Corn for Grain, Center Pivot Irrigated, Sandy Soils • Corn for Grain, Center Pivot Irrigated, Rolling Hills • Corn for Grain, Till-Plant, Rolling Hills • Soybeans, Non-Irrigated • Soybeans, Center Pivot Irrigated • Oats, Non-Irrigated 8 • Oats With Spring Alfalfa Seeding • Alfalfa Seeding • Establish Alfalfa, Sandy Soil, Fall Seeding • Alfalfa Hay, Large Round Baler • Alfalfa Hay Small Square Baler • East Central • Corn for Grain, Center Pivot Irrigated • Soybeans, Center Pivot Irrigated • Corn tor Grain, Non-Irrigated • No-Till Com in Soybean Residue • Grain Sorghum, Non-Irrigated • Soybeans, Non-Irrigated • Soybeans, After Corn Reduced Till • Wheat • Establish Alfalfa, Fall Seeded • Establish Alfalfa, Spring With Herbicide • Alfalfa Hay, Large Round Baler • Alfalfa Hay, Field Stacker • Oats, Non-Irrigated Southeast • Corn for Grain, Center Pivot Irrigated • Corn for Silage, Center Pivot Irrigated • Corn for Grain, Non-Irrigated • Grain Sorghum, Non-Irrigated • Forage Sorghum Silage, Non-Irrigated • Soybeans, Non-Irrigated • Wheat • Alfalfa Hay, Large Round Bale

The effect of landfast sea ice buttressing on ice dynamic speedup in the Larsen B embayment, Antarctica

We observe the evacuation of 11-year-old landfast sea ice in the Larsen B embayment on the East Antarctic Peninsula in January 2022, which was in part triggered by warm atmospheric conditions and strong offshore winds. This evacuation of sea ice was closely followed by major changes in the calving behaviour and dynamics of a subset of the ocean-terminating glaciers in the region. We show using satellite measurements that, following a decade of gradual slow-down, Hektoria, Green, and Crane glaciers sped up by approximately 20%-50% between February and the end of 2022, each increasing in speed by more than 100ma-1. Circumstantially, this is attributable to their transition into tidewater glaciers following the loss of their ice shelves after the landfast sea ice evacuation. However, a question remains as to whether the landfast sea ice could have influenced the dynamics of these glaciers, or the stability of their ice shelves, through a buttressing effect akin to that of confined ice shelves on grounded ice streams. We show, with a series of diagnostic modelling experiments, that direct landfast sea ice buttressing had a negligible impact on the dynamics of the grounded ice streams. Furthermore, we suggest that the loss of landfast sea ice buttressing could have impacted the dynamics of the rheologically weak ice shelves, in turn diminishing their stability over time; however, the accompanying shifts in the distributions of resistive stress within the ice shelves would have been minor. This indicates that this loss of buttressing by landfast sea ice is likely to have been a secondary process in the ice shelf disaggregation compared to, for example, increased ocean swell or the drivers of the initial landfast sea ice disintegration