Phagocytic activity from human PMN obtained from defibrinated peripheral blood of young adults of both sexes was studied. Defibrinated blood was distributed in volumes of 0.6 ml over 12 glass slip ...covers, and incubated at 37 degrees C in humid chamber for 30 minutes, in order to permit the PMN adherence to glass. Then the PMN were rinsed with culture medium, covered with 0.6 ml of 1 x 10(6) latex particles (0.81 microns, Bacto-latex Difco) suspension in autologous serum by milliliter, and incubated by triplicate per 30 minutes at 35 degrees C, 37 degrees C and 39 degrees C. Then slip covers were rinsed with culture medium and stained with Wright stain. Phagocytic index was calculated as the average of phagocytized latex particles per 300 PMN. The results obtained were: at 35 degrees C, 17.26 +/- 6.1; at 37 degrees C, 19.80 +/- 6.26; at 39 degrees C, 21.94 +/- 6.94; and at 41 degrees C, 25.58 +/- 6.69. The correlation coefficient between this temperature increase and the phagocytic indexes was 0.41. This allow to conclude that a direct linear increment exists between the PMN phagocytic indexes and the temperature increase.
Este artículo utiliza un modelo de efectos mixtos para medir la relación entre el conocimiento de una prueba estandarizada a nivel nacional (ENLACE) con pruebas bimestrales administradas a nivel ...aula. Utilizamos una base de datos confidencial donde observamos tanto el resultado en la prueba ENLACE como las calificaciones bimestrales de los alumnos de educación primaria en el Distrito Federal para el periodo 2006-2009. Si el aprendizaje de las aulas se transmite a la prueba ENLACE, entonces las calificaciones bimestrales deberían determinar los resultados en Enlace. Sin embargo, los resultados implican que el aprendizaje de las aulas afecta alrededor de 0.30 desviaciones estándar a la prueba ENLACE. Asimismo, los resultados muestran que la estructura de la escuela tiene un impacto mayor, alrededor de 0.70 desviaciones estándar, sobre el resultado en pruebas estandarizadas que el desempeño del alumno y del docente.
It has been reported that a great part of the deleterious effect caused by ionizing radiations is due to oxidative phenomena. The purpose of this work was to investigate if some antioxidants commonly ...used in the food industry might have a radioprotecting effect. N propyl-galate (NPG), hydroxyanisol-butylated (HAB) and hydroxytoluene-butylated (HTB) were utilized. Forty BALB/C mice that received 600 rads of gamma irradiation from a 60Co emitter died 17.12 +/- 7.82 days after. Thirteen mice that were injected 5 mg of NPG 24 hours and 30 minutes before radiation survived for more than 90 days. This same effect was observed in 13 mice that were also injected with 10 mg NPC and in other 13 that received 10 mg of HAB in the same way. Doses of 5 mg HAB or 5 and 10 mg HTB did not have a radioprotecting effect. When the radiation dose was increased to 800 rads, the radioprotecting effect was absent with any of the NPG, HAB or HTB doses. In protected mice, preservation of higher numbers of hematopoietic cells were observed in the bone marrow together with slight reduction of chromosomal fractures. There results show that antioxidants used in the food industry have a radioprotecting effect that had not been investigated.
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