Effect of deoxynivalenol (DON) mycotoxin on in vivo and in vitro porcine circovirus type 2 infections.

Deoxynivalenol (DON) is a mycotoxin produced by Fusarium spp and is a common contaminant of grains in North America. Among farm animals, swine are the most susceptible to DON because it markedly reduces feed intake and decreases weight gain. Porcine circovirus type 2 (PCV2) is the main causative agent of several syndromes in weaning piglets collectively known as porcine circovirus-associated disease (PCVAD). The objectives of this study were to investigate the impact of DON on PCV2 replication in NPTr permissive cell line, and to determine eventual potentiating effects of DON on PCV2 infection in pigs. Noninfected and infected cells with PCV2 were treated with increasing concentrations of DON (0, 70, 140, 280, 560, 1200 ng/mL) and cell survival and virus titer were evaluated 72 h postinfection. Thirty commercial piglets were randomly divided into 3 experimental groups of 10 animals based on DON content of served diets (0, 2.5 and 3.5 mg/kg DON). All groups were further divided into subgroups of 6 pigs and were inoculated with PCV2b virus. The remaining pigs (control) were sham-inoculated with PBS. In vitro results showed that low concentrations of DON could potentially increase PCV2 replication depending on virus genotype. In vivo results showed that even though viremia and lung viral load tend to be higher in animal ingesting DON contaminated diet at 2.5 mg/kg, DON had no significant effect on clinical manifestation of PCVAD in PCV2b infected animals. DON has neither in vitro nor in vivo clear potentiating effects in the development of porcine circovirus infection despite slight increases in viral replication.

In vitro and in vivo effects of deoxynivalenol (DON) mycotoxin on porcine reproductive and respiratory syndrome virus (PRRSV) in piglets

Les récoltes de céréales sont souvent contaminées par des moisissures qui se développent pendant la récolte et l’entreposage et produisent des métabolites secondaires appelés mycotoxines. Le porc est reconnu pour être sensible au déoxynivalénol (DON). L’infection virale la plus importante chez le porc est causée par le virus du syndrome reproducteur et respiratoire porcin (VSRRP). Celui-ci provoque un syndrome grippal et des troubles de reproduction. L’objectif du présent projet était de déterminer l'effet in vitro de DON sur la réplication du VSRRP dans de lignées cellulaires permissives, MARC-145 et PAM, et déterminer in vivo l'impact de DON dans des aliments naturellement contaminés sur l’infection au VSRRP chez le porcelet. Tout d’abord, les cellules ont été incubées avec des doses croissantes de DON et ont été infectées avec du VSRRP pour évaluer la viabilité et la mortalité cellulaire, la réplication virale et l’expression de cytokines. Les résultats ont montré que les concentrations de DON de 560ng/ml et plus affectaient significativement la survie des cellules MARC-145 et PAM infectées par le VSRRP. En revanche, il y avait une augmentation significative de la viabilité et une réduction de la mortalité cellulaire à des concentrations de DON de 140 à 280 ng/ml pour les cellules PAM et de 70 à 280 ng/ml pour les cellules MARC-145 avec une réduction de l'effet cytopathique provoqué parle VSRRP. Au niveau in vivo, 30 porcelets divisés en 3 groupes de 10 porcelets et nourris pendant 2 semaines avec 3 différentes diètes naturellement ont été contaminées avec DON (0; 2,5 et 3,5 mg/kg). Les porcelets ont été subdivisés en 6 groupes, 3 groupes de 6 porcelets et ont été exposés au DON pendant 2 semaines et infectés par voie intratrachéale et intramusculaire avec le virus. Les 3 autres groupes de 4 porcelets servaient de contrôle non infectés. Les signes cliniques ont été enregistrés pendant 21 jours. La virémie a été évaluée par PCR. À la fin de l’expérimentation, les porcelets ont été euthanasiés et les lésions pulmonaires ont été évaluées. Les résultats ont montré que l’ingestion de DON à 3,5 mg/kg a augmenté l’effet du VSRRP sur la sévérité des signes cliniques, les lésions pulmonaires et la mortalité. L’ingestion de DON à 2,5 mg/kg a entrainé une augmentation de la virémie au jour 3 après l’infection mais sans impact sur les signes cliniques et les lésions pulmonaires. Mot clés: DON, VSRRP, MARC-145, PAM, effet cytopathique, cytokines, PCR

Don Giovanni. Il dissoluto punito ovvero la possibilità e lo spostamento

Traduction du titre : Don Juan. Le dissolu puni ou bien la possibilité et le déplacement.

Deoxynivalenol (DON) naturally contaminated feed impairs the immune response induced by porcine reproductive and respiratory syndrome virus (PRRSV) live attenuated vaccine

Cereal commodities are frequently contaminated with mycotoxins produced by the secondary metabolism of fungal infection. Among these contaminants, deoxynivalenol (DON), also known as vomitoxin, is the most prevalent type B trichothecene mycotoxin worldwide. Pigs are very sensitive to the toxic effects of DON and are frequently exposed to naturally contaminated feed. Recently, DON naturally contaminated feed has been shown to decrease porcine reproductive and respiratory syndrome virus (PRRSV) specific antibody responses following experimental infection. The objective of this study was to determine the impact of DON naturally contaminated feed on the immune response generated following vaccination with PRRSV live attenuated vaccine. Eighteen pigs were randomly divided into three experimental groups of 6 animals based on DON content of the diets (0, 2.5 and 3.5 mg DON/kg). They were fed these rations one week prior to the vaccination and for all the duration of the immune response evaluation. All pigs were vaccinated intra-muscularly with one dose of Ingelvac® PRRSV modified live vaccine (MLV). Blood samples were collected at day −1, 6, 13, 20, 27 and 35 post vaccination (pv) and tested for PRRSV RNA by RT-qPCR and for virus specific antibodies by ELISA. Results showed that ingestion of DON-contaminated diets significantly decreased PRRSV viremia. All pigs fed control diet were viremic while only 1 (17%) and 3 (50%) out of 6 pigs were viremic in the groups receiving 3.5 and 2.5 mg of DON/kg, respectively. Subsequently, all pigs fed control diet developed PRRSV specific antibodies while only viremic pigs that were fed contaminated diets have developed PRRSV specific antibodies. These results suggest that feeding pigs with DON-contaminated diet could inhibit vaccination efficiency of PRRSV MLV by severely impairing viral replication.

Influence of additives on the charactaristics of stone matrix asphalt

The increase in traffic growth and maintenance expenditures demands the urgent need for building better, long-lasting, and more efficient roads preventing or minimizing bituminous pavement distresses. Many of the principal distresses in pavements initiate or increase in severity due to the presence of water. In Kerala highways, where traditional dense graded mixtures are used for the surface courses, major distress is due to moisture induced damages. The Stone Matrix Asphalt (SMA) mixtures provide a durable surface course. Proven field performance of test track at Delhi recommends Stone Matrix Asphalt as a right choice to sustain severe climatic and heavy traffic conditions. But the concept of SMA in India is not so popularized and its application is very limited mainly due to the lack of proper specifications. This research is an attempt to study the influence of additives on the characteristics of SMA mixtures and to propose an ideal surface course for the pavements. The additives used for this investigation are coir, sisal, banana fibres (natural fibres), waste plastics (waste material) and polypropylene (polymer). A preliminary investigation is conducted to characterize the materials used in this study. Marshall test is conducted for optimizing the SMA mixtures (Control mixture-without additives and Stabilized mixtures with additives). Indirect tensile strength tests, compression strength tests, triaxial strength tests and drain down sensitivity tests are conducted to study the engineering properties of stabilized mixtures. The comparison of the performance of all stabilized mixtures with the control mixture and among themselves are carried out. A statistical analysis (SPSS package Ver.16) is performed to establish the findings of this study

Waste plastic as a stabilizing additive in Stone Mastic Asphalt

The present study investigates the benefits of stabilizing the stone mastic asphalt (SMA) mixture in flexible pavement with shredded waste plastic. Conventional (without plastic) and the stabilized SMA mixtures were subjected to performance tests including Marshall Stability, tensile strength and compressive strength tests. Triaxial tests were also conducted with varying percentage bitumen by weight of mineral aggregate (6% to 8%) and by varying percentage plastic by weight of mix (6% to 12% with an increment of 1%). Plastic content of 10% by weight of bitumen is recommended for the improvement of the performance of Stone Mastic Asphalt mixtures. 10% plastic content gives an increase in the stability, split tensile strength and compressive strength of about 64%, 18% and 75% respectively compared to the conventional SMA mix. Triaxial test results show a 44% increase in cohesion and 3% decrease in angle of shearing resistance showing an increase in the shear strength. The drain down value decreases with an increase in plastic content and the value is only 0.09 % at 10% plastic content and proves to be an effective stabilizing additive in SMA mixtures

Influence Of Additives On The Drain Down Characteristics Of Stone Matrix Asphalt Mixtures

In Kerala highways, where traditional dense graded mixtures are used for the surface courses, major distress is due to moisture induced damages. Development of stabilized Stone Matrix Asphalt (SMA) mixtures for improved pavement performance has been the focus of research all over the world for the past few decades. Many successful attempts are made to stabilize SMA mixtures with synthetic fibres and polymers. India, being an agricultural economy produces fairly huge quantity of natural fibres such as coconut, sisal, banana, sugar cane, jute etc.. Now- a -days the disposal of waste plastics is a major concern for an eco- friendly sustainable environment. This paper focuses on the influence of additives like coir, sisal, banana fibres (natural fibres), waste plastics (waste material) and polypropylene (polymer) on the drain down characteristics of SMA mixtures. A preliminary investigation is conducted to characterize the materials used in this study. Drain down sensitivity tests are conducted to study the bleeding phenomena and drain down of SMA mixtures. Based on the drain down characteristics of the various stabilized mixtures it is inferred that the optimum fibre content is 0.3% by weight of mixture for all fibre mixtures irrespective of the type of fibre. For waste plastics and polypropylene stabilized SMA mixtures, the optimum additive contents are respectively 7% and 5% by weight of mixture. Due to the absorptive nature of fibres, fibre stabilizers are found to be more effective in reducing the drain down of the SMA mixture. The drain values for the waste plastics mix is within the required specification range. The coir fibre additive is the best among the fibres investigated. Sisal and banana fibre mixtures showed almost the same characteristics on stabilization.

Los sistemas de econom??a de fichas en el ??rea de Educaci??n F??sica : los don fenomenales

Se presenta experiencia educativa que propone el sistema de econom??a de fichas para motivar al alumnado en el ??rea de la Educaci??n F??sica. Se realiza en el CEIP San Isidro Labrador en El Chaparral, Granada. Los objetivos son: erradicar conductas no deseables en el ??mbito escolar, tratando de lograr una transferencia a la vida real de las conductas positivas aprendidas; paliar deficiencias sociales en cuanto a h??bitos diversos, haciendo especial hincapi?? en aquellos relacionados con la higiene y el aseo personal; interiorizar en el alumnado conductas que por su ??ndole se observen como de especial trascendencia.

Don Quijote busca a Dulcinea

Cuento con pictogramas sobre Don Quijote y Dulcinea realizado por alumnos de educaci??n infantil que versiona la historia de amor de la novela de Cervantes conmemorando la celebraci??n del 400 aniversario de su primera edici??n.

Don Borja y Do??a Blanca : taller literario con alumnado de atenci??n a la diversidad

Las ilustraciones son de Diego Corbal??n Hern??ndez

Seis escenas biográficas sobre la vida de Don Diego Saavedra y Fajardo.

Conjunto de seis narraciones (cuentos) para ser leídos en clase sobre personajes y sucesos históricos con un resumen de los acontecimientos más importantes acaecidos en el año en el que se enmarca temporalmente la narración y una sucinta biografía del personaje. En las notas explicativas se aclara el significado de palabras relevantes para la comprensión de la historia. El objetivo es dar a conocer la vida y la obra de Diego Saavedra y Fajardo, ilustre político y diplomático murciano en los reinados de Felipe III y Felipe IV..

Don't be an Alien. 'No seas un Alien'

Resumen basado en el de la publicaci??n

El pensamiento pedagógico del arabista Don Julian Ribera.

Mostrar, a través de los textos de Ribera, la relevancia de su pensamiento. Se aborda primero su pensamiento pedagógico, esencialmente crítico y original y después, los motivos e influencias en su pensamiento, concluyendo con la vigencia de su obra en la actualidad. Bibliografía. Estudio de la bibliografía. El estudio de la figura de Don Julian Ribera durante su vida pública (1887-1927), nos da a conocer las cuatro dimensiones más a resaltar: su talante crítico lo conduce al estudio del fenómeno educativo en la realidad actual, descubriendo el fracaso de las instituciones pedagógicas, que no crean hombres magistrales, por lo que pide un saber más espontáneo, esto nos lleva a su fe en lo natural, es decir, en el saber práctico frente al teórico, para lo que sugiere un camino que es el arte de aprender junto al de enseñar, quedando todo plasmado en su proyecto pedagógico.

Don Jos?? P??rez Jim??nez (1887-1967)

Resumen tomado de la publicaci??n

Plan exportador para la empresa Croc Ltda. en su línea de productos "Don Chicharrón"

Este trabajo de grado pretende realizar un Plan Exportador mediante el cual sea posible determinar si la empresa Croc Ltda. está o no preparada para exportar su línea de producto “Don Chicharrón”. El proceso se desarrolla a través de: Descripción del estado actual de la empresa, Realización del “Diagnóstico de la Empresa”, Inteligencia de Mercados sumado a la Matriz de Proexport y finalmente el Diseño del Plan de Logística incluido una simulación de costos de exportación al mercado objetivo; en este caso Perú. Como resultado de la investigación se logro determinar que la empresa Croc Ltda. se encuentra en un nivel medio de internacionalización debido a que existen falencias en la ejecución de la Gestión de Mercados, Gestión de Operaciones, Gestión Financiera y Gestión de Talento Humano. Después de seleccionar posibles países para exportar y variables a investigar para construir la “Matriz de Proexport” se concluyo el país objetivo, alterno y contingente; Perú, México y España respectivamente. De esta manera, se comienza la investigación de mercados para los tres países. Para finalizar, en el diseño del plan de logística se determino que la mejor forma para exportar “Don Chicharrón” al Perú es por vía marítima a través del Incoterm DDU (Delivered Duty Unpaid). Es así como se puede concluir este trabajo de grado, y darle cierre a la investigación y entregar a la empresa Croc Ltda. en su línea de productos “Don Chicharrón” un Plan Exportador para que se pueda hacer uso de éste en su proceso de internacionalización.