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Search Results: 1 - 10 of 1495 matches for " Yris; Espinoza "
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Efecto de la fertilización con fósforo en la relación suelo-planta-animal en suelos ácidos del estado Cojedes, Venezuela
Díaz,Yris; Espinoza,Freddy; Gil,José L;
Zootecnia Tropical , 2004,
Abstract: with the purpose of evaluating the effect of two phosphorus sources on pasture yield and beef production, it was carried out an experiment in the central savannas of cojedes state, venezuela. treatments were randomly distributed as, t1: control (no p), t2: 300 kg/ha of partially acidulated rock phosphate (parp), and t3: 500 kg/ha of rock phosphate (rp). the variables were: dry matter pasture yield, crude protein, crude fiber content, calcium content, p content in grass, soil, blood and feces, and beef production by area. no significant differences were found among treatments (p>0.05) for any of the variables; however, it was observed an increase in y matter yield when pasture received p (2.4 and 2.6 t/ha/cut for parp and rp, respectively), compared to control (2.3 t/ha/cut). also, animal production by area was higher with parp treatment (206.4 kg/ha). it was not observed a response to p fertilization, possibly due to the lack of some other macro and micro nutrients, mainly nitrogen. phosphorus applications improved the balance of this element in the system, which would indicate the need of periodical p fertilization to avoid pasture degradation.
Utilización del banco de energía como estrategia de manejo en sabanas del estado Cojedes: II. Producción de materia seca y valor nutritivo
Espinoza,Freddy; Díaz,Yris; Perdomo,Efren; León,Luis;
Zootecnia Tropical , 2002,
Abstract: with the objective to evaluate the effect of energy bank of urochloa humidicola on the production of dry matter (dm) and nutritive value in savannas of poor fertility, it was carried out an experiment in a farm in the municipio tinaco, cojedes state, venezuela (9°42' n; 68"26' o) in soils of medium to heavy texture and low in phosphorous, potassium, and calcium, and with problems with aluminum interchange. it was evaluated two treatments; t1; savanna with energy bank (s + eb) and t2: savanna (s), with a mean stocking rate of 1,2 and 0,58 au/ha, respectively. the area of energy bank was 20% oftotal area. for the estimation the dm, it was used three transects/treatment of 1 km long, where the transects was a repetition. the nutritive value was estimated from the samples of production of dm. the experimental design was a random block and means compared with tukey test for the comparison.the results of dm production showed significant differences among treatments (p>005) for protein, magnesium, cooper, manganese and zinc were observed however, the content of phosphorous, potassium, sodium and protein did not satisfy the animal reqoiremeots it is concluded that the utilization of energy bank io poor savannas is an altemative of use, because increased in 60% dm production and increased the nutritive value.
Comparación botánica de dos bosques deciduos en el municipio San José de Guaribe, estado Guárico, Venezuela
Rengifo,Zulay; Espinoza,Freddy; Romero,Eva; Díaz,Yris;
Zootecnia Tropical , 2008,
Abstract: the objective of this study was to evaluate the botanical composition of two forests in dual purpose ranchs located at northeastern of the guárico state, venezuela. the average annual temperature of the area is 26.9oc, with annual precipitation ranging from 924 to 1,423 mm/yr, and seven dry months (november to may), strongly acidic soils, and low fertility. the evaluation of forests were realized with three transects of 250 m each with a minimum separation of 50 m between them. in each transect there was located an area of 10 x 10 m. the species were identified and calculated the relative importance value (riv). the results showed that the forest in farm a consisted of 26 species, outstanding the families leguminosae (37%), boraginaceae (18%), and bignoniaceae (14%), with 50% of riv was covered by the species tubebuia chrysantha, acacia glomerosa, arabiadaea brachypoda, cordia sp., and guazuma ulmifolia. also, 26 species were found in farm b where the leguminoseae family predominated with 34%, followed by boraginaceae (20%), and bignoniaceae (17%), with 50% of riv covered by the species acacia macracantha, cordia thaisiana, bourreria cumanensis, tubebuia chrysantha, acacia glomerosa, and guazuma ulmifolia. from all species identified in two farms, at least 30% of them have forage value.
Carcinoma adenoideo quístico de la mama: A propósito de un caso
Espinoza,Luis Darío; León,Linerys; Bravo Bello,Yris; Socorro,Grace;
Revista Venezolana de Oncología , 2010,
Abstract: objective: adenoid cystic breast carcinoma is rare variant occurring less than 1 %. the presentation of this case is related to the rarity of it, because the incidence of this tumor in the breast is 0.1 %. method: female patient, 56 years old, menarche: 15 years. iii pregnancy: ib, ip, ia. menopause: 2002. not receiving substitutive hormone therapy. no personal and family history of breast pathology. she came in august, 2007 for breast evaluation, physicalexamination:normal. mammography:breastwith moderate amount of fibroglandular tissue, nodular opacity in union of lower quadrants right breast. breast ultrasound: solid image, with regular edges, located at junction of lower quadrants right breast, measuring 6.1 mm x 7.1 mm x 7.0 mm, which corresponds with nodular mammographic opacity. discussion: mast logical evaluation class iv. histological evaluation of lesion, using the technique of microbiopsia ecoguide. pathology report: adenoid cystic carcinoma, nuclear grade ii. this atypical mitotic activity, stromal desmoplasia severe. immunohistochemistry: ck7 + (secretory cells), ck7/ck14 + (adenosquamous cell), type iv collagen. partial mastectomy was performed in oncology right after echolocate confirmation by imaging, margins cut more frozen sentinel node. with pathology report: adenoid cystic carcinoma of 0.7 cm. nuclear grade i, atypical mitotic activity, edge of surgical resection and additional margin free of injury. additional mammary pathology: fibrocystic status, ductal ectasia. a sentinel lymph node without evidence of malignancy; march 2009, the patient comes to control,where assessment is completed mast logical class iirf.
Respuesta productiva de vacas doble propósito pastoreando soca de sorgo (Sorghum bicolor) y suplementadas con dieta líquida a base de cují (Acacia macracantha) y ureafosfato
Espinoza,Freddy; Díaz,Yris; Hidalgo,Víctor; Folache,Luis; Palma,José;
Zootecnia Tropical , 2009,
Abstract: the experiment was carried out in a farm at the north of guárico state, venezuela, with the objective to evaluate the effect of a liquid diet with molasses, cují leaves (acacia macracantha) and ureaphosphate in dual purpose cows grazing sorghum straw (sorghum bicolor) on the production of milk and weight gain in the dry period, and a simple analysis of income vs. supplement cost. the duration of the experiment was 75 days, including 15 days of adaptation during the dry period of year 2006. thirty two cows bos taurus x bos indicus were used with an initial weight average of 422.5 ± 30.4 kg, grazing a pasture of 80 ha of sorghum straw (pss). the design was a completely random where each animal represented a repetition. two treatments were used, t1: pss and t2: pss supplemented with liquid diet molasses, cují leaves, urea phosphate, and water at the rate of 70, 15, 6, 9%, respectively. the variables studied were milk production (mp), weight gain (wg), dry matter (dm) offer of sorghum straw, and chemical composition. the initial dry matter was 3044 kg dm/ha and residual herbage was 1702 kg dm/ha, which represented 44% of efficiency of grazing of sorghum straw (p<0.01). mp was higher in t2 (6.4 vs. 5.7 l/animal/d) (p<0.01). wg was higher in t2 (p>0.05) with values of 991 g/animal/day. the content of crude protein, calcium, and phosphorus in supplement was 14, 0.78, and 1.18%, respectively (p<0.01). the income was higher in t2 with a difference near to us $ 887. it is concluded that the supplementation with liquid diet molasses-cují-urea phosphate in dual purpose cows improved the bioproductive indicators.
Oferta de forraje en un sistema silvopastoril en la región noreste del estado Guarico, Venezuela
Miliani,Tisbey; Espinoza,Freddy; Gil,José L; Baldizán,Alfredo; Díaz,Yris;
Zootecnia Tropical , 2008,
Abstract: this study was carried out at the san jose de guaribe municipality, northeast of guárico state, venezuela, with the objective to estimate the forage offer in a silvopastoral system during the dry and rainy season of 2007. three treatments were evaluated: grazing on cynodon nlemfuensis, grazing with restricted access to forest for 5 h, and grazing with open access to forest. fifteen to thirty dual purpose steers were used with a grazing pressure of 6 kg dm/100 kg lw. animals were assigned to paddocks of 0.5 and 2 ha. dry matter offer for the grazing grass only was 2,227 and 2,467 kg dm/ha for dry and rainy season, respectively, while when forest was incorporated, offer incremented to 10,800 and 5,926 kg dm/ha, for the same seasons. also, there was a season effect (p<0.01) with higher forge offer in the dry season, as consequence of litter, foliage and fruits from forest species. it is conclude that dry matter forage duplicates in the rainy season, while in the dry season it is five times higher.
Utilización de un bosque deciduo por bovinos a pastoreo
Miliani,Tisbey; Espinoza,Freddy; Gil,José L; Baldizán,Alfredo; Diaz,Yris;
Zootecnia Tropical , 2008,
Abstract: with the objective to evaluate the utilization of a deciduous forest by grazing bovines at northeast of guarico state, venezuela, in dry and rainy seasons in 2007, it was carried out an experiment with a factorial design with randomized blocks. for that, there were used mixed dual purpose heifers with a grazing pressure of 6 kg dm/100 kg lw. the evaluated treatments were three grazing conditions: og: grazing of star grass (cynodon nlemfuensis), raf: grazing of c. nlemfuensis with restricted access to the forest (5 h) and oaf: grazing of c. nlemfuensis with open access to the forest. the area used for the treatments with forest was 2 ha. dry matter utilization of grasses, litter, tree foliage, and fallen fruits were measured. no significant differences were found for grass utilization among treatments. however, significant differences (p<0.01) were observed due to season, being higher at the dry season due to the absence of pasture growing. significant differences were also found for the season by grazing type interaction on the litter and tree foliage utilization. it is concluded that by means of the use of the forest, animals tend to diversify their diets, improving the selectivity capabilities.
Composición botánica de un bosque seco tropical al noreste del estado Guárico, Venezuela
Tisbey,Miliani; Espinoza,Freddy; Gil,José L; Baldizán,Alfredo; Díaz,Yris;
Zootecnia Tropical , 2008,
Abstract: with the objective to identify botanically the woody species present in a tropical dry forest in in the san jose de guaribe parish, northeast of guárico state, venezuela, it was carried out an evaluation on a 4 ha area. the studied zone is classified as a deciduous forest with a mean annual temperature of 27oc and precipitation of 979 mm. the botanical composition of the forest was determined in two side by side paddocks with forested areas of 2 ha by means of three transects of 50 m long by area. the relative importance value was the studied variable. the design used was randomized blocks, and means compared by student?s t. in both forests, leguminosae family predominated with 50.5%. in forest 1, the main families, after legumes, were bromeliaceae (19.7%), euphorbiaceae (9.9%), and bignonaceae (8.7%), while in forest 2 were the families zygophyllaceae (14.5%), bromeliaceae (7.7%), and euphorbiaceae (7.2%). it is concluded that the deciduous forest have potential forage species for bovine production, represented by the legumes.
Carcinoma adenoideo quístico de la mama: A propósito de un caso
Luis Darío Espinoza,Linerys León,Yris Bravo Bello,Grace Socorro
Revista Venezolana de Oncología , 2010,
Abstract: OBJETIVO: El carcinoma adenoideo quístico de la mama es inusual se presenta con una frecuencia menor al 1 %. La presentación de este caso está relacionada con la rareza del mismo, incidencia de 0,1 %. MéTODOS: Paciente femenina 56 a os de edad, menarquía: 15 a os. IIIG, IP, IC, IA. Menopausia: 2002. No recibe terapia hormonal. No antecedentes personales y/o familiares de patología mamaria. Consulta a nuestra unidad por control, examen físico:normal. Mamografía:mamascon moderadacantidad de tejido fibroglandular, evidencia opacidad nodular en unión de cuadrantes inferiores mama derecha. Eco mamario: imagen aspecto sólido bordes regulares, ubicada en cuadrantes inferiores de mama derecha de 6,1 mm x 7,1 mm x 7,0 mm, se corresponde con opacidad nodular mamográfica. DISCUSIóN: Evaluación mastológica clase IV. Se recomienda evaluación histológica de la lesión a través de técnica de biopsia ecoguiada. Anatomía patológica: carcinoma adenoideo quístico. Grado nuclear II, actividad mitótica atípica presente. Desmoplasia estromal severa. Estudio de inmunohistoquímica: CK7+ (célulassecretoras),CK7/CK14+(célulasadenoescamosas), colágeno tipo IV. Se realizamastectomía parcial oncológica derecha, previa localización y confirmación por imagen márgenes por corte congelado más ganglio centinela. Anatomía patológica: carcinoma adenoideo quístico de 0,7 cm. Grado nuclear I. Actividad mitótica atípica presente. Bordes de resección quirúrgica, margen adicional libres de lesión. Patología mamaria adicional: ectasia ductal y condición fibroquística. Ganglio linfático centinela uno sin evidencia de neoplasia. En marzo de 2009, paciente acude a control, donde se realiza evaluación mastológica concluyéndose clase IIRF. OBJECTIVE: Adenoid cystic breast carcinoma is rare variant occurring less than 1 %. The presentation of this case is related to the rarity of it, because the incidence of this tumor in the breast is 0.1 %. METHOD: Female patient, 56 years old, menarche: 15 years. III pregnancy: IB, IP, IA. Menopause: 2002. Not receiving substitutive hormone therapy. No personal and family history of breast pathology. She came in August, 2007 for breast evaluation, physicalexamination:Normal. Mammography:Breastwith moderate amount of fibroglandular tissue, nodular opacity in union of lower quadrants right breast. Breast ultrasound: Solid image, with regular edges, located at junction of lower quadrants right breast, measuring 6.1 mm x 7.1 mm x 7.0 mm, which corresponds with nodular mammographic opacity. DISCUSSION: Mast logical evaluation class IV. Histological evaluation of lesion,
PROBLEMáTICA DE LOS PASIVOS AMBIENTALES MINEROS EN COLOMBIA
ARANGO ARAMBURO MARCELA,OLAYA YRIS
Gestión y Ambiente , 2012,
Abstract: Los pasivos ambientales mineros (PAM) se refieren a "un área donde existe la necesidad de restauración, mitigación o compensación por un da o ambiental o impacto no gestionado, producido por actividades mineras inactivas o abandonadas que pone en riesgo la salud, calidad de vida o bienes públicos o privados" . En Colombia no se han reglamentado los PAM, pero dada la antigüedad y la prevalencia de la informalidad en la explotación minera, el interés en definir, reglamentar y gestionar estas obligaciones es creciente. En este artículo nos aproximamos a la problemática de la valoración de pasivos ambientales en Colombia, basándonos en la revisión de la gestión de PAM mineros en el mundo e identificamos los requerimientos de información clave para realizar dicha gestión en Colombia.
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