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| Registros recuperados: 105 | |
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| Pereira-Junior,Pedro P.; Marocolo,Moacir; Rodrigues,Fabricio P.; Medei,Emiliano; Nascimento,José H.M.. |
| Heart rate variability (HRV) analysis consists in a well-established tool for the assessment of cardiac autonomic control, both in humans and in animal models. Conventional methods for HRV analysis in rats rely on conscious state electrocardiogram (ECG) recording based on prior invasive surgical procedures for electrodes/transmitters implants. The aim of the present study was to test a noninvasive and inexpensive method for ECG recording in conscious rats, assessing its feasibility for HRV analysis. A custom-made elastic cotton jacket was developed to fit the rat's mean thoracic circumference, with two pieces of platinum electrodes attached on its inner surface, allowing ECG to be recorded noninvasively in conscious, restrained rats (n=6). Time- and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Electrocardiography; Heart rate variability; Methodology; Noninvasive; Rat. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200019 |
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| Floodgate, G.d.; Lochte, K.; Egan, B.. |
| The data obtained in surveys to investigate the bacteriological aspects of the biology of two contrasting frontal systems has shown that the Inherent homeostasis and the complexity of the environment, together with the Imprecision of the data, lead to biomass values that are difficult to interpret in terms of the physical factors governing the formation of fronts. Although biochemical measurements offer some promise of providing more reliable and less confusing information, the oeed to develop high precision methods that can be made very frequently is emphasised. |
| Tipo: Text |
Palavras-chave: Bacteria; Discontinuities; Fronts; Methodology. |
| Ano: 1982 |
URL: http://archimer.ifremer.fr/doc/00306/41742/40953.pdf |
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| Franks, J.R.; Collis, Jimi. |
| Benchmarking is the practice of establishing the relative performance of a business or enterprise against an appropriate standard, generally industry standards derived from a survey of farms. The Policy Commission into the Future of Farming and Food (2002) highlighted a need to spread and improve benchmarking on farms. The requirements of effective benchmarking are illustrated in a ten step framework. The ten steps illustrate the range of expertise and resources a manager requires before being able to justify allocating resources to benchmarking. A comparison of alternative farm surveys and methodologies used to collect, analyse and report industry standards illustrates the difficulties farmers can have in identifying appropriate, robust and accurate... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Benchmarking; Comparative analysis; Processes; Industry standards; Methodology; Techniques; Farm Management. |
| Ano: 2003 |
URL: http://purl.umn.edu/24326 |
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| Bakucs, Lajos Zoltan. |
| There is a continuously growing literature on the agricultural transformation in Central and Eastern European countries (see some surveys in Brooks and Nash 2002; Rozelle and Swinnen 2004). The research has focused on various aspects of transition, including land reform, farm restructuring, price and trade liberalisation, but even though Farm Accountancy Data Network (FADN) data are now available for some years, there are only a few studies (e.g. Bakucs et al. 2010, Fogarasi and Latruffe, 2007, Baráth et al., 2009) focusing on Hungarian farm performance. The objective of this paper is to shed light on some methodological issues that are needed to study Hungarian farm performance. Here we consider one aspect of farm performance, namely technical efficiency.... |
| Tipo: Journal Article |
Palavras-chave: Farm technical efficiency; Stochastic Frontier Analysis; Methodology; Productivity Analysis; Research Methods/ Statistical Methods. |
| Ano: 2011 |
URL: http://purl.umn.edu/102404 |
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| Junior,Daniel Dias Valadão; Biachini,Aloísio; Valadão,Franciele Caroline Assis; Rosa,Rodrigo Pengo. |
| This study aimed to evaluate the effect of penetration rate and the size of the cone base on the resistance to penetration under different soil moistures and soil bulk density. The experimental design was completely randomized in a 4x2x2x2 factorial arrangement, with the factors, soil bulk density of 1.0; 1.2; 1.4 and 1.6 Mg m-3, soil moisture at the evaluation of 0.16 and 0.22 kg kg-1, penetration rates of 0.166 and 30 mm s-1 and areas of the cone base of 10.98 and 129.28 mm² resulting in 32 treatments with 8 replicates. To ensure greater uniformity and similarity to field conditions, samples passed through cycles of wetting and drying. Only the interaction of the four factors was not significant. Resistance values varied with the density of the soil,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil bulk density; Soil moisture; Methodology. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052014000200012 |
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| Gaspar-Oliveira, Carolina Maria; UNESP; Martins, Cibele Chalita; Faculdade de Ciências Agronômicas / UNESP - Botucatu-SP; Nakagawa, João; Faculdade de Ciências Agronômicas - UNESP Botucatu-SP. |
| O objetivo do trabalho foi padronizar a metodologia de pré-condicionamento das sementes de mamoneira (Ricinus communis L.) para a avaliação do potencial fisiológico pelo teste de tetrazólio. Testaram-se os seguintes métodos de pré-condicionamento: sementes com tegumento entre papel umedecido a 30, 35 e 40°C por 6, 8, 10, 12, 14, 16 e 18h; sementes sem tegumento entre papel umedecido e sementes com tegumento imersas em água a 25, 30, 35 e 40° C por 1, 2, 3, 4, 5 e 6h. Após o pré-condicionamento, removeu-se o tegumento das sementes, que foram cortadas no sentido do comprimento e imersas na solução de tetrazólio a 0,2%, por 120 min., a 35°C. Avaliaram-se a porcentagem de germinação das sementes, o teor de água, antes e após a... |
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Palavras-chave: 5.01.00.00-9; 5.01.03.00-8; 5.01.03.03-2 Viabilidade; Mamona; Metodologia; Potencial fisiológico Agronomia; Fitotecnia; Produção e Beneficiamento de Sementes Viability; Castor bean; Methodology; Physiological potential. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6025 |
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| Széchy,Maria Teresa M. de; Galliez,Maron; Marconi,Márcia I.. |
| The suitability of quantitative variables for phenological studies was evaluated in a population of the brown seaweed Sargassum vulgare from "Praia das Gordas", Angra dos Reis, Ilha Grande Bay, state of Rio de Janeiro. From June 1998 to May 1999, twenty adult individuals were randomly sampled at bimonthly intervals. Fifteen variables related to the vegetative and reproductive development of perennial and non-perennial parts of the individuals were quantified. Variables related to the non-perennial parts were more useful than those related to the perennial parts, because they showed a clear variation over the year. Vegetative development declined from June to October, and increased from October to February, when maximum median values of thallus height,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Methodology; Reproduction; Sargassum; Temporal variation; Vegetative development. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000100004 |
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| SCHMITZ,M.F.; ZANDONÁ,R.R.; VARGAS,A.A.M.; GARCIA,J.R.; TUNES,L.V.M.; AGOSTINETTO,D.. |
| ABSTRACT: The commercialization of ryegrass seeds with the presence of resistant biotypes is a serious issue that increses the dispersion of resistance to new areas without this problem. Therefore, this study aimed to develop a quick test to detect susceptible and resistant seeds to the glyphosate herbicide in order to identify contaminated seed lots with glyphosate resistance. Three experiments were carried out, one in greenhouse and the other two in the seed laboratory. First, the resistance factor (RF) was determined by a dose-response curve experiment in biotypes suspected to be resistant and susceptible to glyphosate. Then, the germination test was conducted with the selected biotypes under increasing glyphosate rates (0, 3.5, 6.9, 13.9, 27.8, 55.5,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lolium multiflorum; Germination; Herbicide; Methodology. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100243 |
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| Bach, P.; Chauvelon, P.. |
| Daily growth increments (DGI) density - otolith radius relationship according to the von Bertanlanffy's growth model: application to Lutjanus sebae (Cuvier, 1828) in Seychelles. Often, age determination of fishes is conducted from several parts (scales and otoliths for teleost fishes, vertebrae, spine, opercular bones, ...) displaying seasonal marks (annuli) associated with growth checks, which can be used for the estimation of individual age. Since Panella's (1971, 1974) discovery of the daily growth increments (DGI) in the teleost otoliths, age determination with DGI method has been used more and more on larval stages of both temperate and tropical species and juvenile and adult individuals of, principally, snapper and grouper species. The age study of... |
| Tipo: Report |
Palavras-chave: Otolith reading; Age determination; Methodology; Growth; Lutjanus sebae. |
| Ano: 1993 |
URL: http://hdl.handle.net/1834/5119 |
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| Bach, P.; Chauvelon, P.. |
| The age study of fishes using daily growth increments DGI observations is made from: 1- either the exhaustive determination of increments, 2- or the calculation of daily growth increments density for different otolith zones between the nucleus and the margin edge of otolith, the width of increments being presumed constant for each zone. To apply the first method, increments may be readable individually from the nucleus to the margin edge of otolith. This is a very time consuming operation. It can cause miscalculation of increments and errors of the age estimation. The second method, called "DGI density method" is based on the decrease of the increment width in relation to the slowing down of the growth phenomena. The more used approach according to this... |
| Tipo: Report |
Palavras-chave: LUTJANUS SEBAE; Age determination; Growth; Methodology; Otolith reading; Age determination; Growth; Methodology. |
| Ano: 1994 |
URL: http://hdl.handle.net/1834/1315 |
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| Registros recuperados: 105 | |
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