The anatomy of the unopened spear leaf of the chambira palm (Astrocaryum chambira), from which chambira fiber is extracted, is described and compared with that of three species (Astrocaryum jauari, occasionally used for fiber extraction, A. standleyanum and A. perangustatum, which do not provide any fiber). Chambira fiber consists of non-vascular fiber strands closely adhered to the adaxial hypodermis; this forms a compact unit, which makes it easy to separate from the rest of the lamina. A similar arrangement is found in Astrocaryum jauari; however, the non-vascular fiber cells are shorter and fewer per strand. Differences in leaf anatomy of Astrocaryum standleyanum and A. perangustatum may explain why fiber is not extracted: Astrocaryum standleyanum has a dense row of non-vascular fibrous strands under the adaxial hypodermis similar to Astrocaryum chambira but the large size of non-vas...

The purpose of the present investigation has been to observe the effect of the lipidic fractions of Leoidium meyenii Walpers, «maca» on the reproductive organs of female mice, following the method adapted by S. Garg et al (1998) The yellow maca from central andean rcgion (Puna, Junín) was used. Initially we obtained the hexanic and ethanolic éxtracts by means of saponification of the first one, fatty acids and total sterols were separated. Lipidic fractions, which were oraily administered to four groups of female mice in dosis of 200 and 100 mg/kg respectively for a period of 16 days, maintaining the control group. For the histological observation the animals were sacrificed and their avaries were fixed previous to its inclusion in paraffin.The results demostrated a significant stimulative effect on the folliclegenesis with the total sterols fraction on the ovaries of the evaluated a...

The anatomy of the unopened spear leaf of the chambira palm (Astrocaryum chambira), from which chambira fiber is extracted, is described and compared with that of three species (Astrocaryum jauari, occasionally used for fiber extraction, A. standleyanum and A. perangustatum, which do not provide any fiber). Chambira fiber consists of non-vascular fiber strands closely adhered to the adaxial hypodermis; this forms a compact unit, which makes it easy to separate from the rest of the lamina. A similar arrangement is found in Astrocaryum jauari; however, the non-vascular fiber cells are shorter and fewer per strand. Differences in leaf anatomy of Astrocaryum standleyanum and A. perangustatum may explain why fiber is not extracted: Astrocaryum standleyanum has a dense row of non-vascular fibrous strands under the adaxial hypodermis similar to Astrocaryum chambira but the large size of non-vas...

The purpose of the present investigation has been to observe the effect of the lipidic fractions of Leoidium meyenii Walpers, «maca» on the reproductive organs of female mice, following the method adapted by S. Garg et al (1998) The yellow maca from central andean rcgion (Puna, Junín) was used. Initially we obtained the hexanic and ethanolic éxtracts by means of saponification of the first one, fatty acids and total sterols were separated. Lipidic fractions, which were oraily administered to four groups of female mice in dosis of 200 and 100 mg/kg respectively for a period of 16 days, maintaining the control group. For the histological observation the animals were sacrificed and their avaries were fixed previous to its inclusion in paraffin.The results demostrated a significant stimulative effect on the folliclegenesis with the total sterols fraction on the ovaries of the evaluated a...

Las evaluaciones realizadas por el Minedu todos los años, a los estudiantes del nivel primaria y secundaria en nuestro país demuestran el bajo rendimiento en comprensión lectora y razonamiento matemático. Esta es también la realidad de nuestra la Institución Educativa N° 80700 “Carlos Noriega Jiménez” del caserío de Purrupampa del distrito de Sinsicap, ya que en las últimas evaluaciones censales los resultados demuestran bajos niveles de logros de aprendizaje en la capacidad de comprensión de textos en el área de Comunicación en los estudiantes del VI ciclo de EBR, por lo que a través del presente plan de acción trazamos la meta de elevar el nivel satisfactorio de los logros de aprendizajes utilizando diferentes estrategias. Se realizó el trabajo académico con la finalidad de fortalecer las capacidades de los docentes en el área de comunicación, en la competencia d...

El presente trabajo de investigación se realizó con el objetivo de describir los procesos de lectura de textos literarios que realizan los adolescentes en un contexto especial de pandemia ocasionada por el COVID-19. El estudio es de tipo documental y se empleó como métodos al método científico y analítico-sintético e inductivo-deductivo. A partir del abordaje del marco teórico en relación a los objetivos del estudio, se realizó el análisis minucioso de la lectura en adolescentes en el periodo COVID-19, luego del cual se pudo arribar a conclusiones significativas. La investigación concluyó que, la pandemia ha ocasionado impactos negativos en el ámbito educativo, propiciando un incremento en la inequidad de los aprendizajes y en las tasas de deserción; lo que acarreó una disminución en la calidad educativa. En cuanto a la práctica de la lectura en estudiantes a nivel mun...

Purpose. This paper aims to identify what are the moderating factors affecting the relationship between firms’ adoption of international financial and reporting standards (IFRS) and the firm’s opacity. Design/methodology/approach. This study uses the meta-analysis methodology from Hunter et al. (1982) to find if the mere IFRS adoption reduces firm’s opacity and a meta-regression from Stanley and Jarrell (1989) to identify the moderating factors that may influence this relationship. Findings. Contrary to previous studies, this study finds a low, negative and nonsignificant correlation between IFRS adoption and firms’ opacity, but this relationship depends on the geographical region. Using 34 results from 28 studies from different continents published between 2005 and 2018 this study finds that IFRS adoption reduces opacity in countries with common law (COML) and with more authorit...

Purpose. This paper aims to identify what are the moderating factors affecting the relationship between firms’ adoption of international financial and reporting standards (IFRS) and the firm’s opacity. Design/methodology/approach. This study uses the meta-analysis methodology from Hunter et al. (1982) to find if the mere IFRS adoption reduces firm’s opacity and a meta-regression from Stanley and Jarrell (1989) to identify the moderating factors that may influence this relationship. Findings. Contrary to previous studies, this study finds a low, negative and nonsignificant correlation between IFRS adoption and firms’ opacity, but this relationship depends on the geographical region. Using 34 results from 28 studies from different continents published between 2005 and 2018 this study finds that IFRS adoption reduces opacity in countries with common law (COML) and with more authorit...

Objectives: To determine the influence of Bidens pilosa L. whole plant ethanolic extract on colon cancer induced in rats. Design: Experimental study. Setting: Faculties of Medicine, Pharmacy and Biochemistry and Biologic Sciences, Universidad Nacional Mayor de San Marcos, Lima, Peru. Biologic material: Holzmann rats. Interventions: Fortyeight 2 months 100 g to 130 g Holtzmann rats were separated in six groups of eight each and 1,2-dimethylhidrazine induction of colon cancer was performed. Groups were normal control, group with pathology and groups with pathology and treatments. Main outcome measures: Nitric oxide levels, oxidative stress markers and colon cellular pattern modifications. Results: There was increment of nitric oxide levels and lipoperoxidation in the 1,2-dimethylhidrazine (DMH) animals, and decrease in those receiving both the toxic and the plant extract. Histopathology re...

The objetive has been to determine the antiinflammatory activity in Vitro in red globules of rats and to know the security in rates of the watery extract atomizado of Krameria's lappacea root (ratania), also the marker of oxidativo stress (malondialdehído MDA). The antiinflammatory activity in vitro (Hernández et al. 2006) was in red globules of rat faced 10, 50, 100 and 200 ug/mL of extract, a solution control (distilled water 1 mL) and solution of reference hidrocortisona to 400 ug/mL; the security was realized in albino rats Holtzmann distributed in 3 groups: normal with physiological whey 5 mL/kg, A group with inoculation subcutaneous route of a compound constituted by dietilamina and nitrito of sodium in three mammary glands, and the third in addition to inoculate received 300 mg/kg of the extract administered by oral route to the day for 30 days, then it extracted sample of blood...

Objective: To determine the influence of both the ethanolic extract and the methanolic fraction containing phenolic and flavonoids compounds of Bidens pilosa L whole plant on gastric cancer induced in rats with N-nitroso-N-methylurea (NMU). Design: Experimental. Setting: Instituto de Investigaciones ClínicasBioterio, Facultad de Medicina UNMSM. Biologic material: Holtzmann male albino rats. Interventions: Following Ferraz de Souza et al., 2002, we had a normal control group, a group with NMU and NMU groups plus treatments with ethanolic extract and methanolic fraction at 300 mg/kg doses. For statistical significance we considered p<0,05. Main outcome measures: Progresion of gastric neoplasia induced in rats. Results: Indicate dysplasia and initial stages of carcinoma in the rats stomachs, which was less evident in the animals with treatment, being better the group that received the m...

El objetivo ha sido determinar la actividad antiinflamatoria in Vitro en glóbulos rojos de ratas y saber la seguridad en ratas del extracto acuoso atomizado de la raíz de Krameria lappacea (ratania}, asimismo el marcador de estrés oxidativo (malondialdehído MDA). La actividad antiinflamatoria in vitro (Hemández et al. 2006) fue en glóbulos rojos de rata enfrentados a 10, 50, 100 y 200 ug/mL de extracto, una solución control (agua destilada lmL) y solución de referencia hidrocortisona a 400 ug/mL; la seguridad se realizó en ratas albinas cepa Holtzmann distribuidas en tres grupos: normal con suero fisiológico 5 mL/kg, un grupo con inoculación vía subcutánea de un compuesto constituido por dietilamina y nitrito de sodio en tres glándulas mamarias, y el tercero además del inóculo recibió 300 mg/kg del extracto administrado por vía oral una vez al día durante 30 días, lue...