oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 3 )

2019 ( 333 )

2018 ( 425 )

2017 ( 437 )

Custom range...

Search Results: 1 - 10 of 328992 matches for " V. R. Canavesio "
All listed articles are free for downloading (OA Articles)
Page 1 /328992
Display every page Item
Valores predictivos y sensibilidad a nivel de rodeo de mastitis a partir de las características de las pruebas diagnósticas individuales y el tama o del muestreo Herd-level predictive values and sensitivity of mastitis base on individual-animal mastitis characteristics and sample size
M.L. Signorini,V.R. Canavesio,V.E. Neder,A.I. Molineri
InVet , 2008,
Abstract: El objetivo del presente trabajo fue ilustrar las dificultades para interpretar los resultados de las principales pruebas diagnósticas individuales para infecciones intramamarias (IIM) y su relación con el estatus sanitario del rodeo y el tama o del muestreo. Los datos empleados correspondieron a muestreos realizados en tambos de las provincias de Santa Fe, Córdoba y Buenos Aires (Argentina) entre mayo de 1999 y agosto de 2007, seleccionados sobre la base de presentar problemas de IIM. Los resultados refuerzan la importancia que debe darse al tipo de prueba empleada para estudios a nivel de rodeo y las consideraciones que deben realizarse para interpretar la distribución de las prevalencias de las enfermedades antes de realizar cualquier extrapolación a partir de pruebas diagnósticas individuales. Para clasificar correctamente la prevalencia de IIM a nivel de rodeos en los que se presume una baja prevalencia, se debe muestrear una proporción de animales cercana al 15% y tender al empleo de técnicas diagnósticas con alta sensibilidad, mientras que la especificidad de la técnica es importante cuando se presumen prevalencias altas. Our objective was to build a simulation model to illustrate the difficulties in interpreting the results of intramammary infections diagnostic test and its relationship with the herd sanitary status and the sample size. Data used in this study corresponded to microbiological testing of composite milk samples of lactating cows from dairy farms located in the Provinces of Santa Fe, Córdoba and Buenos Aires (Argentina) between May 1999 and August 2007. The results reinforce the importance to be given to the type or test used to studies at herd-level and the consideration to interpreting the diseases prevalence distributions before making any extrapolation from individual diagnostic tests. To properly classify of mammary infections prevalence at herd-level, if presumed a low herd prevalence, a greater proportion of animals must be sampled and tend to use diagnostic test with high sensibility, whereas if the herd prevalence is high, the most important to consider is the diagnostic test specificity.
Intramammary infections during the periparturient period in Argentine dairy heifers Infecciones intramamarias durante el periparto en vaquillonas en Argentina
L. F. Calvinho,V. R. Canavesio,I. A. Iguzquiza,I. Marioni
Revista argentina de microbiolog?-a , 2007,
Abstract: Prevalence of intramammary infections at prepartum and postpartum in primigravid heifers from five dairy herds located in the central dairy area of Argentina was determined. Mammary secretion samples from 140 heifers (560 mammary quarters) were obtained 14 days prior to the expected calving day and within 7 days after parturition and subjected to bacteriological analysis. No clinical mastitis cases were detected during the study. The number of infected heifers in at least one mammary quarter at pre and postpartum was 87 (62.2%) and 53 (37.8%), respectively. The most prevalent mastitis pathogens at prepartum among samples yielding a positive bacteriological culture were coagulasenegative staphylococci (69.07%), Staphylococcus aureus (12.71%) and Streptococcus uberis (4.42%). A decrease on isolation frequency of coagulase-negative staphylococci (53.41%) and S. uberis (2.27%) was observed at postpartum, while that of S. aureus showed an increase (21.59%). Presence of intramammary infections appeared to be associated with some management conditions. These results highlighted the need to improve diagnosis and control measures in replacement heifers. Se determinó la prevalencia al preparto y posparto de infecciones intramamarias causadas por organismos patógenos de mastitis en vaquillonas primíparas de cinco establecimientos lecheros ubicados en la cuenca central santafesina. Se tomaron muestras de secreción mamaria de 140 vaquillonas (560 cuartos mamarios) aproximadamente 14 días antes de la fecha probable de parto y dentro de los 7 días posparto, y se procesaron bacteriológicamente. No se detectaron casos de mastitis clínicas durante el estudio. El número de vaquillonas infectadas en al menos un cuarto mamario al preparto y posparto fue de 87 (62,2%) y 53 (37,8%), respectivamente. Los organismos patógenos más prevalentes al preparto entre las muestras con cultivo bacteriológico positivo fueron estafilococos coagulasa negativos (69,07%), Staphylococcus aureus (12,7%) y Streptococcus uberis (4,42%). Al posparto se observó un descenso en la frecuencia de aislamiento de estafilococos coagulasa negativos (53,41%) y S. uberis (2,27%), mientras que la de S. aureus mostró un aumento (21,59%). La presencia de infecciones intramamarias pareció estar asociada con algunas prácticas de manejo. Estos resultados ponen de manifiesto la importancia de hacer extensivo el diagnóstico y control de la enfermedad a las vaquillonas de reemplazo antes de su ingreso al rodeo en orde o.
Valores predictivos y sensibilidad a nivel de rodeo de mastitis a partir de las características de las pruebas diagnósticas individuales y el tama?o del muestreo
Signorini,M.L.; Canavesio,V.R.; Neder,V.E.; Molineri,A.I.; Vitulich,C.A.; Tarabla,H.D.; Calvinho,L.F.;
InVet , 2008,
Abstract: our objective was to build a simulation model to illustrate the difficulties in interpreting the results of intramammary infections diagnostic test and its relationship with the herd sanitary status and the sample size. data used in this study corresponded to microbiological testing of composite milk samples of lactating cows from dairy farms located in the provinces of santa fe, córdoba and buenos aires (argentina) between may 1999 and august 2007. the results reinforce the importance to be given to the type or test used to studies at herd-level and the consideration to interpreting the diseases prevalence distributions before making any extrapolation from individual diagnostic tests. to properly classify of mammary infections prevalence at herd-level, if presumed a low herd prevalence, a greater proportion of animals must be sampled and tend to use diagnostic test with high sensibility, whereas if the herd prevalence is high, the most important to consider is the diagnostic test specificity.
Intramammary infections during the periparturient period in Argentine dairy heifers
Calvinho,L. F.; Canavesio,V. R.; Iguzquiza,I. A.; Marioni,I.; Puricelli,F. G.; Neder,V. E.; Tarabla,H. D.; Aubagna,M. D.;
Revista argentina de microbiolog?-a , 2007,
Abstract: prevalence of intramammary infections at prepartum and postpartum in primigravid heifers from five dairy herds located in the central dairy area of argentina was determined. mammary secretion samples from 140 heifers (560 mammary quarters) were obtained 14 days prior to the expected calving day and within 7 days after parturition and subjected to bacteriological analysis. no clinical mastitis cases were detected during the study. the number of infected heifers in at least one mammary quarter at pre and postpartum was 87 (62.2%) and 53 (37.8%), respectively. the most prevalent mastitis pathogens at prepartum among samples yielding a positive bacteriological culture were coagulasenegative staphylococci (69.07%), staphylococcus aureus (12.71%) and streptococcus uberis (4.42%). a decrease on isolation frequency of coagulase-negative staphylococci (53.41%) and s. uberis (2.27%) was observed at postpartum, while that of s. aureus showed an increase (21.59%). presence of intramammary infections appeared to be associated with some management conditions. these results highlighted the need to improve diagnosis and control measures in replacement heifers.
Presence of enterotoxigenic Staphylococcus aureus in bulk tank milk from Argentine dairy farms
Neder,Verónica E.; Canavesio,Vilma R.; Calvinho,Luis F.;
Revista argentina de microbiolog?-a , 2011,
Abstract: staphylococcus aureus is the most prevalent bovine mastitis pathogen in argentina. the ability of this organism to produce enterotoxins is linked to staphylococcal food poisoning. staphylococcal enterotoxins are low molecular weight proteins, highly resistant to heat and proteolytic enzyme activity. the aim of this study was to determine the ability to produce enterotoxins and types of enterotoxins a through e produced among 94 s. aureus isolated from bulk tank milk in argentina by enzyme-linked immunosorbent assay. eleven isolates (11.7 %) produced enterotoxins. seven of them (7.4 %) produced enterotoxin c, two (2.1 %) enterotoxin d, one (1.1 %) enterotoxin b and one (1.1 %) enterotoxins c-d-e. none of the isolates produced enterotoxins a or e alone. since presence of staphylococcal enterotoxins constitute a potential risk to public health, these findings underscore the need to control s. aureus bovine mastitis and to limit bacterial multiplication in bulk tank milk.
Presence of enterotoxigenic Staphylococcus aureus in bulk tank milk from Argentine dairy farms Presencia de Staphylococcus aureus enterotoxigénico en leche de tanque de frío de tambos de Argentina
Verónica E. Neder,Vilma R. Canavesio,Luis F. Calvinho
Revista argentina de microbiolog?-a , 2011,
Abstract: Staphylococcus aureus is the most prevalent bovine mastitis pathogen in Argentina. The ability of this organism to produce enterotoxins is linked to staphylococcal food poisoning. Staphylococcal enterotoxins are low molecular weight proteins, highly resistant to heat and proteolytic enzyme activity. The aim of this study was to determine the ability to produce enterotoxins and types of enterotoxins A through E produced among 94 S. aureus isolated from bulk tank milk in Argentina by enzyme-linked immunosorbent assay. Eleven isolates (11.7 %) produced enterotoxins. Seven of them (7.4 %) produced enterotoxin C, two (2.1 %) enterotoxin D, one (1.1 %) enterotoxin B and one (1.1 %) enterotoxins C-D-E. None of the isolates produced enterotoxins A or E alone. Since presence of staphylococcal enterotoxins constitute a potential risk to public health, these findings underscore the need to control S. aureus bovine mastitis and to limit bacterial multiplication in bulk tank milk. Staphylococcus aureus es el patógeno causante de mastitis más prevalente en Argentina. Las enterotoxinas producidas por este organismo constituyen una de las causas más importantes de intoxicación alimentaria en seres humanos. Las enterotoxinas estafilocócicas son proteínas de bajo peso molecular, termoestables y resistentes a enzimas proteolíticas. El objetivo del presente trabajo fue determinar por enzimoinmunoensayo la presencia de enterotoxinas A-E y establecer su tipo en 94 aislamientos de Staphylococcus aureus obtenidos de leche de tanque de frío de tambos de Argentina. Se identificaron 11 % aislamientos enterotoxigénicos (11,7 %); siete (7,4 %) produjeron enterotoxina C, dos produjeron enterotoxina D (2,1 %), uno produjo enterotoxina B (1,1 %) y uno produjo enterotoxinas C-D-E (1,1 %). No se detectaron aislamientos que produjeran enterotoxinas A o E solamente. Estos hallazgos indican la necesidad de implementar un eficaz control de la mastitis bovina para disminuir la presencia de S. aureus en leche de tanque y evitar riesgos potenciales para la salud pública.
Croissance économique des pays émergents et géographie mondiale des pierres précieuses
Remy Canavesio
EchoGéo , 2011,
Abstract: L’évolution mondiale des activités extractives est de plus en plus dépendante de la demande des pays émergents. Les conséquences de la croissance de ces pays sur les exploitations de pierres précieuses sont complexes car le marché des gemmes a de nombreuses particularités. La demande est étroitement liée aux matrices socioculturelles de chaque pays. Par ailleurs, l’enrichissement des populations a également un impact sur la production de pierres telles que les saphirs ou les rubis. En effet, ces gemmes sont principalement extraites dans des exploitations informelles et cette activité est de moins en moins attractive pour une population dont le niveau de vie s’élève peu à peu. Dans les vastes gisements sri lankais et birmans, l’épuisement de la ressource est une autre menace. Finalement, si la croissance du marché du diamant est assurée par le Canada, la Russie et l’Australie, pour les autres gemmes, l’Afrique de l’Est est devenue le nouvel Eldorado . Dans ces pays, les contextes géologiques, économiques, politiques et sociaux sont très favorables au développement des exploitations artisanales de gemmes. Extraction activities evolution is more and more dependent on the increase of demand in the emerging countries. The consequences of this growth on the gemstone mining activities are complex. The gemstone market is very special and the demand depends on the historic and cultural situation of every country. Moreover, for precious stones like rubby and sapphire, the supply coming from this emerging country is also affected by the social and economic changes. As the small scale mining is widely held in this activity, people that are becoming richer are less interested in that kind of job. In Sri Lanka and Burma, the depletion of many deposits is an other challenge. Finally, if new diamonds deposits of Canada, Russia and Australia are supplying the growth of the diamond market, Est Africa looks like the new Eldorado for the other gemstones. Geologic, economic, social and political context of these countries are perfectly adapted for the development of new gemstone small scall mining areas.
Association between milking practices and psychrotrophic bacterial counts in bulk tank milk Asociación entre prácticas de orde o y recuento de organismos psicrótrofos en leche de tanque de frío
Ana I. Molineri,Marcelo L. Signorini,Alejandra L. Cuatrín,Vilma R. Canavesio
Revista argentina de microbiolog?-a , 2012,
Abstract: The objective of this work was to determine on-farm risk factors for psychrotrophic bacterial counts in bulk tank milk from dairy farms in Argentina. Raw milk samples from bulk tanks of 27 dairy farms were examined for total psychrotrophic counts (TPC), proteolytic psychrotrophic counts (PPC) and lipolytic psychrotrophic counts (LPC) (dependent or outcome variables). A survey recording infrastructure conditions, milking equipment and milking management (independent variables) was performed. Bivariate association proofs and logistic regression analyses were used to determine association between independent variables and psychrotrophic bacterial counts. Milk cooled in plate heat exchangers or barrel tanks were 16.39 and 10.52 times more likely to yield TPC and PPC above the standard established for high quality milk compared with milk cooled in bulk tanks, respectively. Periodic cleaning of cooling tanks (3 times a week or daily) was associated with lower TPC (approximately 1.5 log CFU/ml) than weekly cleaning frequency and farms where milkers did not wash their hands during milking time were 7.81 times more likely to have higher PPC. No association was found between LPC and any of the independent variables. The only variable associated with TPC and PPC in a logistic regression model was the refrigeration system used on the farm. Dairy farms that possessed bulk milk cooling tanks yielded the lowest bacterial counts. Results of this study highlight the importance of both the type of cooling system used on the farm and its adequate hygienic maintenance for obtaining low pshychrotrophic counts at dairy farm. El objetivo del trabajo fue determinar los factores de riesgo para altos recuentos de organismos psicrótrofos en leche de tanques de tambos de la Argentina. Se examinaron muestras de leche cruda de tanques de frío de 27 tambos, y se realizó el recuento de organismos psicrótrofos totales (PT), de psicrótrofos proteolíticos (PP) y de psicrótrofos lipolíticos (PL) (variables dependientes). Se realizó una encuesta para registrar las condiciones de infraestructura, el equipo de orde o y las prácticas de orde o (variables independientes). Se utilizaron pruebas bivariadas de asociación y regresión logística para determinar la asociación entre las variables independientes y los recuentos de organismos psicrótrofos. La leche enfriada en sistemas de placas de intercambio o tanques tipo cuba tuvo una probabilidad mayor de dar recuentos elevados de PT y PP (16,39 y 10,52) comparada con la enfriada en tanques tipo "panza fría". La limpieza periódica del equipo de frí
Giant Plagioclase Basalts from Northeastern Deccan Volcanic Province, India: Implications for Their Origin and Petrogenetic Significance  [PDF]
Reddy V. R. Talusani
International Journal of Geosciences (IJG) , 2012, DOI: 10.4236/ijg.2012.35103
Abstract: The giant plagioclase basalts (GPBs) with plagioclase phenocrysts that reach up to 3 cm in length are found near Jabalpur in the northeastern part of the Deccan Volcanic Province (DVP). The thickness of the basalt flow (flow 6) that contains the GPBs is ~ 20 m. Plagioclase phenocysts (An58 - An64) in the GPBs display many features of magma mixing (e.g., resorption, reverse zoning). Of the nine flows in the Jabalpur section, the GPBs (flow 6) with lowest Mg#s (38 - 43) and MgO (4.16 - 5.08 wt%), Ni and Cr abundances are the most evolved compositions. In addition, these GPBs have highest abundances of incompatible elements (TiO2, P2O5, Nb, Zr, Sr and Ba). The GPBs are compositionally similar to the well-studied Mahabaleshwar lavas of the western DVP. This new occurrence of GPBs has implications for existence of local crustal magma chambers, feeders and vents in the northeastern part of the DVP.
Aggression questionnaire scores in extremely violent male prisoners, male bodybuilders, and healthy non-violent men  [PDF]
Henning Vr?y
Open Journal of Psychiatry (OJPsych) , 2013, DOI: 10.4236/ojpsych.2013.33029
Abstract:

Two aggression questionnaires, the Revised Swedish Version (AQ-RSV) of the Buss-Perry Aggression Questionnaire (AQ) and the shortened and refined version by Bryant and Smith (BS-AQ) were compared. Both questionnaires identified subscore levels of aggression and there were significant differences between the groups. On the AQ-RSV subscales, the violent inmates showed statistically significantly more aggression for Hostility (p = 0.000), Anger (p = 0.000), Physical Aggression (p = 0.000) and Verbal Aggression (p = 0.01) than the healthy (non-violent) men. The bodybuilders, all “on” performance-enhancing substances, scored significantly higher on the Physical Aggression subscale than the healthy men (p = 0.000). Compared to the bodybuilders, the violent inmates scored significantly higher on the Anger (p = 0.02) and Hostility (p = 0.002) subscales. For the BS-AQ, where general variance was higher than for the original AQ, some of the above mentioned relationships were different. The violent inmates still scored significantly higher than the healthy men for Hostility (p = 0.000), Anger (p = 0.006) and Physical Aggression (p = 0.000), but not for Verbal Aggression. The inmates scored significantly higher than the bodybuilders for Anger (p = 0.006) and Verbal Aggression (p = 0.006), and the bodybuilders scored higher than the healthy men on the Physical Aggression (p = 0.002) subscale only. These and other more complex relationships are discussed in the light of previous findings. Thus the BS-AQ resulted in more sharply defined relationships and, at the same time, showed some important differences between the groups studied. Verbal Aggression does not seem to distinguish violent inmates from healthy men. Angry bodybuilders tend to express their aggression through Physical Aggression.

Page 1 /328992
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.