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| Registros recuperados: 95 | |
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| Dominguez, M.. |
| La Antártica se ha constituido en una región de gran interés científico debido a las condiciones extremas que allí se presentan, en especial, de temperatura y radiación ultravioleta. En el campo de la microbiología, las investigaciones se han enfocado, principalmente, en el estudio de la biodiversidad bacteriana, lo que ha llevado a la descripción de nuevas especies, y también gran interés ha despertado la producción de compuestos con aplicaciones biotecnológicas. Entre éstos se encuentran los que pudieran presentar actividad antibacteriana, de gran importancia debido a que uno de los mayores problemas de los últimos años es la emergencia de patógenos intrahospitalarios con una amplia resistencia a los agentes antibacterianos disponibles, no existiendo... |
| Tipo: Journal Contribution |
Palavras-chave: Bacteria; Antibiotics; Antibiotics; Bacteria; Http://aims.fao.org/aos/agrovoc/c_492; Http://aims.fao.org/aos/agrovoc/c_765. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3365 |
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| Oliveira,Maria Luiza Peixoto de; Costa,Marcio Gilberto Cardoso; Silva,Crislene Viana da; Otoni,Wagner Campos. |
| The objective of this study was to evaluate the effects of 6-benzylaminopurine (BAP) and α-naphthaleneacetic acid (NAA) combinations, basal media and beta-lactam antibiotics on in vitro organogenesis from mature stem segments of 'Pêra', 'Valência' and 'Bahia' sweet oranges and 'Cravo' rangpur lime. For induction of shoot regeneration, the segments of the four cultivars were placed on Murashige and Skoog (MS) medium containing the following BAP/NAA concentrations: 0.0/0.0; 0.25/0.0; 0.25/0.25; 0.5/0.0; 0.5/0.5; 1.0/0.0; 2.0/0.0; 2.0/0.25; 2.0/0.5; and 2.0/1.0 mg L-1. In order to test the influence of the culture media on shoot-bud induction, (MS), Murashige and Tucker (MT), and woody plant medium (WPM) formulations were evaluated, associated with the best... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus limonia; C. sinensis; Adult tissues; Antibiotics; Organogenesis. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000700004 |
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| Miller, Gay Y.; Algozin, Kenneth A.; McNamara, Paul E.; Bush, Eric J.. |
| Public health experts are concerned about the diminishing efficacy of antibiotics. Some have called for a ban on growth-promoting antibiotics in animal agriculture. This study identifies the contribution of growth-promoting antibiotics in the grower/finisher phase of U.S. pork production. With National Animal Health Monitoring System swine data, relationships are estimated between growth-promoting antibiotic use and productivity. Results indicate improvements in average daily gain (0.5%), feed conversion ratio (1.1%), and mortality rate (reduced 0.22 percentage points); these productivity improvements translate into a profitability gain of $0.59 per pig marketed, or an improvement of 9% in net profits associated with growth promotion antibiotics. |
| Tipo: Journal Article |
Palavras-chave: Antibiotics; Economics; Growth promotants; Productivity; Resistance; Swine; Q12; Q18. |
| Ano: 2003 |
URL: http://purl.umn.edu/43146 |
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| MacDonald, James M.; Wang, Sun Ling. |
| We use data from a recent national survey to analyze the use of subtherapeutic antibiotics (STAs) among producers of broilers. STAs are included in feed or water and are intended to prevent disease or promote growth. Producers who do not use STAs instead rely on a set of other practices, including pathogen testing, expanded sanitary protocols, altered feeding regimens, and HACCP plans, to maintain production. We find that producers who do not use STAs realize levels of production that are slightly lower, given other inputs, than STA users, but the differences are not statistically significant. STA users realize lower payments per pound than those who are not users. The 4 percent difference, which is statistically significant, suggests that STA users have... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Antibiotics; Broilers; Production; Industrial Organization; Livestock Production/Industries; Production Economics; Q12. |
| Ano: 2009 |
URL: http://purl.umn.edu/49198 |
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| McBride, William D.; Key, Nigel D.; Mathews, Kenneth H., Jr.. |
| Antimicrobial drugs are fed to hogs at sub-therapeutic levels to prevent disease and promote growth. However, there is concern that the presence of antimicrobial drugs in hog feed is a factor promoting the development of antimicrobial drug-resistant bacteria. This study describes the extent to which antibiotics are used in hog production and how this changed between 2004 and 2009. This study also uses a sample-selection model to examine the impact that use has on the productivity of U.S. hog operations. Using hog producer data from 2004, the analysis did not find a relationship between productivity and sub-therapeutic antibiotics fed during finishing, but productivity was significantly improved when fed to nursery pigs. These results are being evaluated... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Antibiotics; Hogs; Sample selection; Farm Management; Production Economics. |
| Ano: 2011 |
URL: http://purl.umn.edu/103232 |
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| Ott, Stephen L.. |
| The NAHMS Dairy '96 Study was designed to provide both participants and the industry with information on the nation's dairy animal population for education and research. The USDA's National Agricultural Statistics Service (NASS) collaborated with NAHMS to select a statistically valid sample yielding 2,542 producers. Included in the study were 20 states that represented 83.1 percent of the U.S. milk cows as of January 1, 1996. Veterinary Medical Officers (VMO's) and Animal Health Technicians (AHT's) collected data for Part III from 1,219 operations that had 30 or more milk cows on January 1, 1996, from February 20 through May 24, 1996. Contact for this paper: Steven Ott |
| Tipo: Report |
Palavras-chave: NAHMS; Dairy; Cattle; Health; Mastitis; Labor; Antibiotics; Biosecurity; Vaccination; Manure management; Livestock Production/Industries. |
| Ano: 1996 |
URL: http://purl.umn.edu/32752 |
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| Hayes, Dermot J.; Jensen, Helen H.. |
| McDonald's Corporation, one of the largest buyers of meat in the U.S. fast-food industry, recently adopted a policy that prohibits its direct suppliers from using medically important antibiotics as growth promotants in food animals after 2004. Although the implications of such a voluntary ban in the United States remain to be seen, recent experiences in Denmark provide some comparable evidence on the effects for hog production. An economic analysis, compiled from information gleaned from interviews with Danish veterinarians, farmers, economists, and industry analysts, estimates the economic costs of an antibiotics ban on pork producers in the United States. Denmark first imposed a ban in pork production at the finishing stage, which was considered a... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Antibiotics; Economic costs of regulation; Food safety; Pork production; Livestock Production/Industries. |
| Ano: 2003 |
URL: http://purl.umn.edu/36919 |
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| Laxminarayan, Ramanan; Brown, Gardner M., Jr.. |
| In recent years bacteria have become increasingly resistant to antibiotics, leading to a decline in the effectiveness of antibiotics in treating infectious disease. This paper uses a framework based on an epidemiological model of infection in which antibiotic effectiveness is treated as a nonrenewable resource. In the model presented, bacterial resistance (the converse of effectiveness) develops as a result of selective pressure on nonresistant strains due to antibiotic use. When two antibiotics are available, the optimal proportion and timing of their use depends precisely on the difference between the rates at which bacterial resistance to each antibiotic evolves and on the differences in their pharmaceutical costs. Standard numerical techniques are used... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Antibiotics; Disease; Externality; Livestock Production/Industries; Q3; I1. |
| Ano: 2000 |
URL: http://purl.umn.edu/10619 |
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| Registros recuperados: 95 | |
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