SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Larsen, Eric R.; Lloyd, James W..

The potential need for several new services within the Veterinary Teaching Hospital (VTH) is unknown. However, based on focus groups and practitioner surveys conducted over the last several years, potential new services were identified: overnight emergency, behavior medicine, equine sports medicine, dentistry, oncology and exotic animal medicine. Michigan State University's College of Veterinary Medicine (MSU-CVM) has recently expanded its equine research, diagnostic and therapy capabilities with the addition of the new Mary Anne McPhail Equine Performance Center. As a result of this expansion, a study was conducted to determine whether the VTH should also broaden its clinical offerings with a new complement of services targeted specifically toward...

Tipo: Working or Discussion Paper

Palavras-chave: Teaching/Communication/Extension/Profession.

Ano: 2002

URL: http://purl.umn.edu/11752

A MARKETING SYSTEMS APPROACH TO REMOVING DISTRIBUTION BARRIERS CONFRONTING SMALL-VOLUME FRUIT AND VEGETABLE GROWERS

Rhea, Alice J.; Eastwood, David B.; Brooker, John R.; Estes, Edmund A.; Stegelin, Forrest E.; Woods, Timothy A..

A MARKETING-SYSTEM APPROACH TO REMOVING DISTRIBUTION BARRIERS CONFRONTING SMALL-VOLUME FRUIT AND VEGETABLE GROWERS

Palavras-chave: Industrial Organization; Marketing.

Ano: 2002

URL: http://purl.umn.edu/16620

Eastwood, David B.; Brooker, John R.; Stegelin, Forrest E.; Woods, Timothy A.; Estes, Edmund A..

Tipo: Journal Article

Palavras-chave: Marketing.

Ano: 2002

URL: http://purl.umn.edu/27647

A mathematical framework for group analysis of von Willebrand factor multimeric composition following luminography

BJMBR

Lopes,A.A.; Soares,R.P.S.; Maeda,N.Y..

The objective of the present study was to establish a method for quantitative analysis of von Willebrand factor (vWF) multimeric composition using a mathematical framework based on curve fitting. Plasma vWF multimers from 15 healthy subjects and 13 patients with advanced pulmonary vascular disease were analyzed by Western immunoblotting followed by luminography. Quantitative analysis of luminographs was carried out by calculating the relative densities of low, intermediate and high molecular weight fractions using laser densitometry. For each densitometric peak (representing a given fraction of vWF multimers) a mean area value was obtained using data from all group subjects (patients and normal individuals) and plotted against the distance between the peak...

Tipo: Info:eu-repo/semantics/other

Palavras-chave: Von Willebrand factor; Luminography; Densitometry; Curve fitting; Pulmonary hypertension.

Ano: 2002

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002001100002

A Mathematical Model for the Removal of Organic Mater in Stabilization Ponds

BABT

Medri,Waldir; Medri,Vandir.

This work presents an application to systemize the construction of ponds systems for treatment of domestic sewage. It consisted of two anaerobic ponds operated in parallel during May/97 to April/99. These were connected in series with a chicaned facultative pond. The treatment system was controlled with samples collected from the crude sewage (compound sample), in the affluents and effluents of the ponds and along the flux of the anaerobic and facultative ponds. The following parameters were analyzed: pH, Biochemical Oxygen Demand, Chemical Oxygen Demand, Total Solids, Sedimentable Solids, Total Coliforms, Oxygen Consumed in Acid Medium (OCAM) and temperature.

A MATHEMATICAL PROGRAMMING MODEL FOR OPTIMAL MANAGEMENT ZONE DELINEATION IN PRECISION AGRICULTURE

Palavras-chave: Stabilization ponds; Mathematical model; Optimization.

Ano: 2002

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000100014

Dillon, Carl R..

The identification of optimal management zones, including optimal uniform grid size, is a complex issue central to the successful implementation of variable rate input application. A novel economic optimization model is developed and applied that identifies the economically optimal management zone. Variable rate seeding can increase profits and reduce risk.

A menu-driven facility for complex sample size calculation in randomized controlled trials with a survival or a binary outcome

Palavras-chave: Farm Management.

Ano: 2002

URL: http://purl.umn.edu/19672

Royston, Patrick; Babiker, Abdel.

We present a menu-driven Stata program for the calculation of sample size or power for complex clinical trials with a survival time or a binary outcome. The features supported include up to six treatment arms, an arbitrary time-to-event distribution, fixed or time-varying hazard ratios, unequal patient allocation, loss to follow-up, staggered patient entry, and crossover of patients from their allocated treatment to an alternative treatment. The computations of sample size and power are based on the logrank test and are done according to the asymptotic distribution of the logrank test statistic, adjusted appropriately for the design features.

Tipo: Journal Article

Palavras-chave: Randomized controlled trials; Survival analysis; Logrank test; Experimental design; Research Methods/ Statistical Methods.

Ano: 2002

URL: http://purl.umn.edu/115958

A Meta-Analysis of Technical Efficiency in Farming: A Multi-Country Perspective

Bravo-Ureta, Boris E.; Rivas, Teodoro E.; Thiam, Abdourahmane.

The objective of this study is to undertake a meta-analysis seeking to explain the variation in average technical efficiency focusing on the agricultural sector. For this purpose, a meta-analysis of 126 technical efficiency studies on the agricultural sector of developing and developed countries was undertaken. In addition, the study contributes to cross-country productivity literature because the existing body of work in this area typically uses aggregate (i.e., national) level data to estimate total factor productivity and has ignored the technical efficiency component of productivity. The econometric results suggest that stochastic frontier models generate higher mean technical efficiency estimates than deterministic models, while parametric frontier...

A Method for chromosome location of new Autosomal recessive mutations of Ceratitis capitata (Wiedemann) (Diptera: Tephritidae) based on crosses with three strains bearing autosomal-Y translocations

Palavras-chave: Farm Management.

Ano: 2002

URL: http://purl.umn.edu/7018

Neotropical Entomology

ZAPATER,MIGUEL C.; PEREZ-CAMARGO,GLADYS.

A method is proposed to locate any new autosomal and recessive mutation in the Mediterranean fruit fly, Ceratitis capitata (Wied.). A series of crosses searches for pseudo-linkage between sex and the mutation by employing three strains with Y-linked translocations, thereby indicating its chromosome location.

A method for soil health assessment in the conversion to organic farming

Palavras-chave: Insecta; Mediterranean fruit fly; Y chromosome; Pseudo-linkage.

Ano: 2002

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2002000100009

Organic Eprints

Mata, Macarena; Garrido, Marisol; Longhurst, Phil; Seaton, Roger.

This paper was presented at the UK Organic Research 2002 Conference of the Colloquium of Organic Researchers (COR). The regulation for the assessment of the conversion to organic farming establishes the use of soil/produce pollution and the type of agricultural practices as indicators of performance. However, these indicators don’t reflect the complexity of the soil ecosystem and soil health. Therefore, complementary indicators were sought (soil biostructure and field capacity), and a specific three-steps method for the assessment and monitoring of soil health during the conversion process was developed.

Tipo: Conference paper, poster, etc.

Palavras-chave: Soil biology; Technology transfer; Biodiversity and ecosystem services; Soil quality.

Ano: 2002

URL: http://orgprints.org/8236/1/mata_soil_health_assessment_conversion.pdf

A Methodological Note on the Estimation of Programming Models

Heckelei, Thomas; Wolff, Hendrik.

The paper introduces a general methodological approach for the estimation of constrained optimisation models in agricultural supply analysis. It is based on optimality conditions of the desired programming model and shows a conceptual advantage compared to Positive Mathematical Programming in the context of well posed estimation problems. Moreover, it closes the empirical and methodological gap between programming models and duality based functional models with explicit allocation of fixed factors. Monte Carlo simulations are performed with a maximum entropy estimator to evaluate the functionality of the approach as well as the impact of empirically relevant prior information in small sample situations.

A Methodology to Evaluate the Impact of Cost Recovery in Canadian Agriculture and Agri-Food Chains

Palavras-chave: Agricultural Supply Analysis; Programming Models; Maximum Entropy Estimation; Prior Information; Research Methods/ Statistical Methods.

Ano: 2002

URL: http://purl.umn.edu/24896

A MODEL OF DEVELOPMENT OF AGRICULTURAL BIOTECHNOLOGICAL INNOVATIONS: PATENT POLICY ANALYSIS

Short, Cameron.

This publication is a technical report describing the methodology Strategic Policy Branch used in its cumulative impact study (which was published in 1998). The purpose is to further document the methodology and adapt it to estimate coefficients which can be used to assist in the analysis of proposed fees. Its main audience is policy analysts within government. The report presents a description of the economic analysis of user fees, describes a mathematical model used to quantitatively assess the impact of a change in user fees, and presents sets of coefficients or multipliers which can be used to estimate the incidence of proposed fees.

Tipo: Report

Palavras-chave: Agricultural and Food Policy.

Ano: 2002

URL: http://purl.umn.edu/54496

Nadolnyak, Denis A.; Sheldon, Ian M..

In this paper, peculiarities of the process of development of agricultural biotechnological innovations are considered, in particular the distinction between R&D races for gene discoveries and subsequent competition for developing their marketable applications in the form of genetically modified (GM) crops, the results of which determine the payoffs of discovering a gene. A formal two-stage model is specified and analyzed with regard to how different patent protection regimes and other government policies affect firm's R&D strategies and the welfare realized from an innovation. We find that different policy measures affect the outcomes of the two stages of biotechnological innovation differently, which leaves some ambiguity as to which patent...

A Model of Diffusion of Genetically Modified Crop Technology in Concentrated Agricultural Processing Markets - The Case of Soybeans

Palavras-chave: Research and Development/Tech Change/Emerging Technologies.

Ano: 2002

URL: http://purl.umn.edu/19802

Nadolnyak, Denis A.; Sheldon, Ian M..

In the paper, a dynamic model of diffusion of genetically modified crop technology is developed and simulated using the U.S. soybean market data. The model accounts for factors specific to agricultural markets, such as oligopsony power and strategic interaction among crop processors, growers' characteristics such as adoption behavior, and identity preservation requirements. Simulation results show how these factors affect the magnitude and distribution of the potential gains from genetically modified crops.

A MODEL OF ENTRY-EXIT DECISIONS AND CAPACITY CHOICE UNDER DEMAND UNCERTAINTY

Palavras-chave: Biotechnology in agriculture; Soybeans; Innovation diffusion; Oligopsony; Genetically modified crop; Consumer/Household Economics.

Ano: 2002

URL: http://purl.umn.edu/24872

Isik, Murat; Coble, Keith H.; Hudson, Darren; House, Lisa.

Many investment decisions of agribusiness firms such as when to invest in an emerging market or whether to expand the capacity of the firm involve irreversible investment and uncertainty about demand, cost or competition. This paper uses an option-value model to examine the factors affecting an agribusiness firm's decision whether and how much to invest in an emerging market under demand uncertainty. Demand uncertainty and irreversibility of investment make investment less desirable than the net present value (NPV) rule indicates. The inactive firm is more reluctant to enter the market when it takes into account demand uncertainty because it preserves the opportunity of making a better investment later. The active firm is more reluctant to abandon the...

A MODEL OF INFORMATION AND I.T. ADOPTION IN FOOD SUPPLY CHAINS

Palavras-chave: Agribusiness decision-making; Demand uncertainty; Entry-exit decisions; Net present value; Real options; Remote sensing; Demand and Price Analysis.

Ano: 2002

URL: http://purl.umn.edu/19797

Mohtadi, Hamid; Kinsey, Jean D..

Evidence from the Food Supply chain suggests that food retailers often exhibit a reluctance to share information with their suppliers even when this benefits both parties. For example, inventory coordination and reduced costs may be realized by adopting appropriate supply chain management technologies such as cooperative planning, forecasting, and replenishment. This behavior is explained by viewing information as a strategic asset and modeling information exchange and the corresponding adoption of information technologies and analysis as a strategic game, i.e., an economic model where food retailers and their suppliers operate with uncertainty. The game is based on stylized facts from the food industry. Some key results from the game model are: (a) under...

Tipo: Working or Discussion Paper

Palavras-chave: Information technology; Supply chain; IT strategy; Food industry; Industrial Organization; Research and Development/Tech Change/Emerging Technologies.

Ano: 2002

URL: http://purl.umn.edu/14299

A model to explain high values of pH in an alkali sodic soil

Scientia Agricola

Guerrero-Alves,José; Pla-Sentís,Ildefonso; Camacho,Rafael.

For alkali sodic soils (pH>8.5), the "hydrolysis of exchangeable sodium" has been used as a possible explanation for the alkalinity production and rise in pH of these soils. As an alternative to this hypothesis, a model was developed to simulate and to explain that the alkalinity production and rise in pH is possible in a soil that accumulates alkaline sodium salts and CaCO3. Several simulations were performed by using different combinations of CO2 partial pressures (P), presence or absence of MgCO3, along with experimental values of exchangeable sodium percentage (ESP) and ion concentrations in saturation extracts from an alkali sodic soil (named Pantanal). A hypothetical system with similar conditions to the Pantanal soil but with a Gapon selectivity...

A morfometria e o estado trófico de um reservatório urbano: lagoa do Nado, Belo Horizonte, Estado de Minas Gerais

Palavras-chave: Gapon selectivity coefficients; Calcium carbonate; Sodium bicarbonate; Alkaline hydrolysis.

Ano: 2002

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400021

Biological Sciences

Bezerra Neto, José Fernandes; UFMG; Pinto-Coelho, Ricardo Motta; UFMG.

São descritas as características morfométricas de um pequeno reservatório, a lagoa do Nado. Trata-se de lago artificial raso, com 2,7 m e 7,6 m de profundidades média e máxima, respectivamente. A localização, no fundo de um pequeno vale, rodeado por vegetação de grande porte, elevada profundidade relativa (5,5%) e bacia de acumulação de formato cônico (Dv = 1,07), indica uma alta estabilidade física da coluna de água. O tempo de retenção da água no reservatório, no período seco, foi de 78 dias e, no período chuvoso, de 2,1 dias. O presente estudo ainda apresenta a primeira carta batimétrica do reservatório. Finalmente, o estado trófico foi avaliado mensalmente, de setembro/99 a setembro/00, utilizando-se o índice de estado trófico (IET) de Carlson. O...

Palavras-chave: 2.00.00.00-6 Ciências Biológicas morfometria; Reservatório; Estado trófico 2.00.00.00-6 Ciências Biológicas.

Ano: 2002

URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2263

A MULTIATTRIBUTE UTILITY ANALYSIS OF TECHNOLOGICAL CHOICE IN THE CALIFORNIA WILD RICE INDUSTRY

Noel, Jay E.; Ahern, James.

Technological choice and competitive strategy issues are reviewed and then a framework for choosing between two competing technologies is proposed.The two competing technologies differ in their ability to store and process wild rice over a marketing year. The traditional technologies requires almost immediate processing of the harvested wild rice while the experimental technology allows harvested wild rice to be stored and processed over the course of the marketing year. Technological choice is explored using multiattribute utility analysis and two economic evaluations. The economic evaluations are payback period analysis and internal rate of return analysis given uncertain demand conditions. The experimental technology is shown to be the dominant...

A multicenter comparative study of cefepime versus broad-spectrum antibacterial therapy in moderate and severe bacterial infections

Palavras-chave: Research and Development/Tech Change/Emerging Technologies.

Ano: 2002

URL: http://purl.umn.edu/19870

BJID

Badaró,Roberto; Molinar,Fernando; Seas,Carlos; Stamboulian,Daniel; Mendonça,João; Massud,João; Nascimento,Luiz Olympio.

The safety and efficacy of cefepime empiric monotherapy compared with standard broad-spectrum combination therapy for hospitalized adult patients with moderate to severe community-acquired bacterial infections were evaluated. In an open-label, multicenter study, 317 patients with an Acute Physiology and Chronic Health Evaluation (APACHE II) score ranging from >5 to =19 were enrolled with documented pneumonia (n=196), urinary tract infection (n=65), intra-abdominal infection (n=38), or sepsis (n=18). Patients were randomly assigned 1:1 to receive cefepime 1 to 2 g IV twice daily or three times a day or IV ampicillin, cephalothin, or ceftriaxone ± aminoglycoside therapy for 3 to 21 days. For both treatment groups, metronidazole, vancomycin, or macrolide...