ABSTRACT
Este estudo foi desenvolvido com o objetivo de avaliar a expressão gênica do fator de crescimento semelhante à insulina I (IGF-I) e do receptor do hormônio do crescimento (GHR) no fígado e no músculo do peito de codornas de corte, alimentadas com dietas contendo diferentes níveis de suplementação de metionina, em duas gerações sucessivas. Foram utilizadas codornas dos 22 aos 42 dias de idade, distribuídas em três e cinco tratamentos na primeira e na segunda geração, respectivamente. Ao final, as aves foram abatidas por deslocamento cervical, sendo coletados fígado e músculo do peito para extração de RNA total. O cDNA foi amplificado usando primers específicos para os genes analisados. Os resultados mostraram que a expressão dos genes GHR e IGF-I sofreu influência da suplementação. No quinto tratamento, em que apenas a primeira geração recebeu uma suplementação acima do padrão das exigências para o período, houve uma expressão significativamente maior do GHR tanto no músculo do peito como no fígado e igualmente do IGF-I no músculo, levando a concluir que o excesso de metionina na dieta torna-se tóxica para as aves. Apesar de a expressão dos genes ter sofrido influência da adição de metionina nos níveis estudados, não foi observada diferença no consumo alimentar, na conversão alimentar e no peso das aves.(AU)
This study was conducted to evaluate the gene expression of the insulin-like I growth factor (IGF-I) and growth hormone receptor (GHR), in the liver and chest muscle of slaughter quails fed with diets containing different levels of methionine supplementation, in two successive generations. Twenty-two to 42 day-old quails were used, distributed in three and five treatments in the first and second generation, respectively. At the end, the birds were killed by cervical dislocation, and their liver and chest muscle were collected for total RNA extraction. The cDNA was amplified using specific primers for the genes analyzed. The results showed that the expression of GHR gene and IGF-I were influenced by the supplementation. In the fifth treatment, where only the first generation received supplementation above the standard requirements for the period, there was a significantly higher expression of GHR both in muscle chest and in the liver, and also IGF-I on muscle, leading to the conclusion that the excess dietary methionine becomes toxic to birds. Despite the gene´s expression seeming to be influenced by the addition of methionine levels in the study, there was no difference in feed intake, feed conversion and weight of the birds.(AU)
Subject(s)
Animals , Coturnix/genetics , Dietary Supplements/analysis , Gene Expression , Insulin-Like Growth Factor I/genetics , Methionine/administration & dosage , Receptors, Somatotropin/genetics , DNA Primers , Real-Time Polymerase Chain Reaction/veterinaryABSTRACT
Background: Angiogenesis is a complex process. Phosphodiesterase inhibitors may have a direct angiogenic effect. Aim: To determine if phosphodiesterase inhibitors have angiogenic properties, using a chicken egg model. Material and Methods: We used 44 fertilized chicken eggs. A methylcellulose filter was placed over their allantocorionic membrane. This preparation was instilled with different solutions. Group A (Control) received 30 u.1 of saline solution, Group B, C and D received 30 jul of a solution made of saline solution and sildenafil at different concentrations of 0.33, 1 and 3.3 u-g/ul, respectively. At day 12 the filters were removed, prepared for histologic analysis, and the number of capillaries in an area of 2250 urn² were blindly counted. Statistical analysis was made using variance analysis (ANOVA) with Bonferroni technique (p < 0.001). Results: The number of capillaries counted, per 2250 urn², in Groups A, B, C, and D were 11.1 +/- 0.5, 15.4 +/- 1.2, 16.6 +/- 0.8 and 19.2 +/- 0.9, respectively. The number of capillaries of groups B, C and D were significantly higher than those of group A (control). Moreover, there was a linear relationship between the number of capillaries and sildenafil dose (p < 0.001). Conclusions: In this experiment, sildenafil had a potent angiogenic effect.
Introducción: El proceso de angiogenesis es un proceso complejo. El uso de factores proangiogénicos está bien establecido. En este estudio se trató de averiguar si los inhibidores de fosfodiesterasa, además de su rol vasodilatador, tendrían un efecto angiogénico en los tejidos para evaluar su potencial uso terapéutico futuro en injerto dermoepidérmico. Hipótesis: Se plantea como hipótesis que el inhibidor de fosfodiesterasa tiene un efecto angiogénico directo. Material y Método: Se utilizaron 44 huevos de pollo fecundados obtenidos del Instituto de Salud Pública (ISP), a los cuales se les implantó un disco de metilcelulosa sobre la membrana alantocoriónica, a los que luego se les instiló distintas soluciones: Grupo A control, se instiló 30li1 de solución fisiológica. Grupo B, C y D 30li1 de solución con Citrato de Sildenafil a una concentración de 0,33 Lig/u.1, 1 ug/Lil y 3,3 ug/ul respectivamente. Al día 12 se removieron los discos y se fijaron para análisis histológico y se contaron de manera ciega los capilares en área de 2.250 um². Análisis estadístico con método de análisis de varianza (ANOVA) con técnica de Bonferroni (p < 0,001). Resultados: En Grupo A control, existía un promedio de 11,09 capilares/2.250um² DS 0,52. Grupo B 15,35 capilares/2.250 um² DS 1,19. Grupo C 16,62 capilares/2.250 Lim² DS 0,82. Grupo D 19,2 capilares/2.250 um² DS 0,89. Se encontró que el numero de capilares era significativamente mayor en los Grupos B, C y D en relación a control (p < 0,001). Además se observó diferencias estadísticamente significativas entre todos los grupos que recibieron tratamiento con dosis progresivas del Citrato de Sildenafil (p < 0,001). Conclusión: Se observó un efecto angiogénico del inhibidor de fosfodiesterasa utilizado, lo que podría ser aplicado en modelo para estudiar angiogénesis en injertos.
Subject(s)
Phosphodiesterase Inhibitors/pharmacology , Neovascularization, Physiologic , Piperazines/pharmacology , Sulfones/pharmacology , Analysis of Variance , Models, Biological , Purines/pharmacology , Skin TransplantationABSTRACT
En continuidad con los estudios del área de Perfiles de la Cátedra de Psicología Experimental I y II, se llevó a cabo un análisis comparativo de Perfiles de Personalidad en estudiantes de psicología. La muestra fue intencional y autoseleccionada, quedó conformada por 153 estudiantes de Psicología. Se ha utilizado un diseño Descriptivo y Comparado. El instrumento utilizado fue el Inventario Multifásico de la Personalidad Minnesota-2 (MMPI-2). Los resultados reportan que existe un patrón de personalidad con similitudes muy acentuadas en los estudiantes de la carrera de psicología, independiente del curso al que pertenecen, y en comparación a los perfiles de años anteriores (n = 152, muestra 2001: n=168, muestra 2007: y n= 101 muestra 2008).
In continuity with the studies of the area of Profiles of the Professorship of Experimental Psychology I and II, a comparative analysis of Profiles of Personality in students of psychology was carried out. The sample was intentional and autoseleccionada, remained conformed by 153 (166) students of Psychology. A Descriptive design has been utilized and Compared. The instrument utilized was the Polyphase Inventory of the Personality Minnesota-2 (MMPI-2). The results report that a boss of personality with similarities exists very accentuated in the students of the career of psychology, independent of the course to which they belong, and in comparison to the profiles of previous years (n = 152 sample 2001; n = 168, sample 2007 and n = 101 sample 2008).
ABSTRACT
Se llevó a cabo un análisis correlacional entre el conocimiento y uso de las nuevas tecnologías y la preferencia en la comunicación de estudiantes de segundo año de la Educación Media del Colegio Público seleccionado. La muestra fue intencional y autoseleccionada, conformada por 277 estudiantes de segundo año de la Educación Media. Se aplicó un diseño descriptivo, exploratorio y correlacional. Los instrumentos utilizados fueron los siguientes cuestionarios: "Conocimiento y Uso de las Nuevas Tecnologías de la Información y la Comunicación (NTIC's)" y "Preferencias de los jóvenes en su Comunicación Cotidiana". Los resultados reportan que existe correlación entre el conocimiento y uso y la preferencia de comunicación en los estudiantes de segundo año de la Educación Media.
It has been made a correlational analysis between knowledge and usage of new technologies and preference in communication of second year of Secondary Education (11th grade) students from a selected public school. The sample was intentional, self-selected and composed of 277 students. A descriptive, exploratory and correlational design was applied. The used instruments were the following questionnaires: "Knowledge and Usage of New Technologies of Information and Communication (NITC's)" and "Young people's Preference in Daily Communication". The results indicated that there is a correlation between knowledge and usage, and the preference of communication in students attending second year of Secondary.
ABSTRACT
Se contemplan los nuevos aspectos conceptuales, adquiridos en base a los avances en el campo inmunologico, la citoquimica, de cinetica celular y microscopia electronica aplicados para una mejor comprension de las linfohistiopatias. Todos ellos han cristalizado en la interpretacion del SMF asi como en una topografia inmunologica de estas estructuras, desembocando en clasificaciones con miras hacia una nosotaxia citohistogenetica-inmunologica