Sample records for NEON 19 (neon 19)
from WorldWideScience.org

Sample records 1 - 3 shown.



1

Evaluación del Riego Ambiental del Insecticida Metamidofos en Bioensayos con Cuatro Organismos Acuáticos no Destinatarios/ Environmental Risk Assessment of the Insecticide Metamidophos in Bioassays with Four Non-Target Aquatic Organisms

Iannacone O, José; Onofre C, Roxana; Huanqui S, Olga; Giraldo A, Jorge; Mamani P, Nancy; Miglio T, Maria C; Alvariño F, Lorena
2007-06-01

Resumen en español El objetivo de este trabajo fue evaluar el efecto ecotoxicológico del metamidofos, en dos formulaciones de diferente categoría toxicológica [Monofos®, categoría Ia (extremadamente peligroso) y Tamaron®, categoría Ib (altamente peligroso)] sobre cuatro organismos acuáticos no destinatarios: la lombriz roja Chironomus calligraphus (Goeldi, 1905) (Diptera:Chironomidae), el erizo negro Tetrapygus niger Molina, 1782 (Echinodermata: Arbaciidae), el neón tetra Paracheir (mas) odon innesi (Rabout, 1940) (Osteichthyes: Characidae) y la trucha Oncorhynchus mykiss (Walbaum, 1792) (Osteichthyes: Salmonidae). Ambas formulaciones del metamidofos provocaron un alto riesgo sobre el ambiente acuático, al encontrarse efectos sobre las larvas de C. calligraphus (Clase Ia, CL50 a 48 h = 1,32 mg i.a. L-1 y Clase Ib, CL50 a 48 h = 4,5 mg i.a. L-1), sobre la fertilización de T. niger (Class Ia, CI50 a 1 h = 1423 mg i.a. L-1 y Clase Ib, CI50 a 1 h = 608 mg i.a. L-1), en P. innesi (Clase Ia, CL50 a 96 h = 20,56 mg i.a. L-1 y Clase Ib, CL50 a 96 h = 10,13 mg i.a. L-1) y en O. mykiss (Clase Ib, CL50 a 96 h = 19,12 mg i.a. L-1). La secuencia de sensibilidad al metamidofos en ambas formulaciones fue: C. calligraphus > O. mykiss ≈ P. innesi > T. niger. En adición, se evaluaron dos efectos subletales en P. innesi, inmovilización y nado extraño, y finalmente, incremento de movimiento opercular en O. mykiss. Los cuocientes de riesgo (CR) indicaron en todos los casos un alto riesgo del metamidofos en el ambiente acuático Resumen en inglés The aim of this research was to evaluate the ecotoxicological effect of methamidophos using two formulations of different toxicological class [Monofos®, class Ia (extremely dangerous) and Tamaron®, class Ib (highly dangerous)] on four non-target aquatic organisms: bloodworm Chironomus calligraphus (Goeldi, 1905) (Diptera: Chironomidae), black sea urchin Tetrapygus niger Molina, 1782 (Echinodermata: Arbaciidae), neon tetra Paracheirodon innesi (Rabout, 1940) (Osteichthye (mas) s: Characidae); and rainbow trout Oncorhynchus mykiss (Walbaum, 1792) (Osteichthyes: Salmonidae). Both methamidophos formulations evidenced a high risk effect on the aquatic environment, finding effects on larvae of C. calligraphus (Class Ia, LC50 at 48 h = 1.32 mg a.i. L-1 and Class Ib, LC50 at 48 h = 4.5 mg a.i. L-1), on fertilization of T. niger (Class Ia, IC50 at 1 h = 1423 mg a.i. L-1 and Class Ib, IC50 at 1 h = 608 mg a.i. L-1), on P. innesi (Class Ia, LC50 at 96 h = 20.56 mg a.i. L-1 and Class Ib, LC50 at 96 h = 10.13 mg a.i. L-1) and O. mykiss (Class Ib, LC50 at 96 h = 19.12 mg a.i. L-1). The sequence of sensibility to methamidophos in both formulations was: C. calligraphus > O. mykiss ≈ P. innesi > T. niger. In addition, two sublethal effects were evaluated on P. innesi, immobilization and strange swimming, and finally an increment of opercular movement in O. mykiss. Risk quotients (RQ) indicated in all cases a high risk of methamidophos towards the aquatic environments

Scientific Electronic Library Online (Spanish)

2

LASER EN EL TRATAMIENTO DE LA NEOPLASIA INTRAEPITELIAL DE VAGINA

Yazigi I, Roberto; Rodríguez A, Tulio; Contreras M, Luis
2006-01-01

Resumen en español Objetivo: Presentar la experiencia en el tratamiento de la neoplasia intraepitelial de vagina (VAIN) utilizando el láser de CO2. Método: 19 pacientes con el diagnóstico histológico de VAIN fueron tratadas con esta técnica. Se utilizó un diámetro del punto de helio-neón de 1,5 a 2 mm y un poder de densidad de 400 a 500 W/cm². Toda la lesión detectable más un margen de al menos 5 mm de tejido circundante aparentemente normal fueron vaporizados a una profundidad d (mas) e 2 mm. Resultados: 12 de las 14 pacientes evaluables lograron una respuesta completa inicial (86%), de éstas 12 hubo 2 recidivas posteriores (17%), obteniendo una curación en 10 de las 14 evaluables (71%). No hubo complicaciones y se preservó una función vaginal normal. Conclusión: La vaporización con láser es una buena modalidad terapéutica en VAIN, particularmente en mujeres jóvenes en que se ha descartado razonablemente la coexistencia de cáncer invasor Resumen en inglés Objective: To describe our experience in the treatment of vaginal intra-epithelial neoplasia (VAIN) with the use of CO2 laser. Method: Nineteen patients with the diagnosis of VAIN were treated by this technique. We used a spot size of 1.5 to 2 mm and a power density of 400 to 500 W/cm². The entire lesion in addition to at least a 5 mm margin of adjacent tissue were vaporized to a depth of 2 mm. Results: 12 of 14 evaluable patients had an initial complete response (86%), (mas) of these 12, there were 2 recurrences (17%), obtaining a 71% cure rate (10/14). There were no complications and preservation of normal vaginal function. Conclusion: Laser vaporization is a very good treatment modality, particularly in young women in whom the co-existence of invasive malignancy has been ruled out

Scientific Electronic Library Online (Spanish)

3

Aptitud biológica de poblaciones de Bemisia tabaci (Gennadius) Biotipo B (Hemiptera: Aleyrodidae) con diferente susceptibilidad al insecticida thiametoxam/ Fitness of Bemisia tabaci (Gennadius) B Biotype (Hemiptera: Aleyrodidae) populations with different levels of susceptibility to the thiametoxam insecticide

Campuzano-Martínez, Aidee; Rodríguez-Maciel, J Concepcion; Lagunes-Tejeda, Ángel; Llanderal-Cázares, Celina; Terán-Vargas, Antonio P; Vera-Graziano, Jorge; Vaquera-Huerta, Humberto; Silva-Aguayo, Gonzalo
2010-06-01

Resumen en inglés In two field-collected populations of de Bemisia tabaci (Gennadius) B biotype previously selected with the neonicotinoid insecticide thiamethoxam (NEO-R, NEO-N), and a population susceptible to insecticides (SUSC), the level of response to the insecticide thiametoxam, as well as the life and fertility tables were determined. At LC95, the NEO-R population showed a resistance ratio (RR95) value of 8.8-fold, an intrinsic rate of increase (r m) of 0.72. The fitness of the NEO (mas) -R and NEO-N populations in relation to the SUSC was 1.5 and 2.0, respectively. The RR95 value for NEO-N was 1.9-fold; it's r m value was 0.082, while in the SUSC population was 0.041. The developmental time of egg and adult were longer in NEO-R population, while the nymph and pupa lasted longer in the NEO-N and SUSC populations. The developmental time was different in the three NEO-R, NEO-N, and SUSC populations with 19.7 d (315.84 degree days or dd), 15.7 d (250.4 dd) and 18.5 d (296.6 d), respectively. The populations previously selected with thiamethoxam did not reproduce faster than their susceptible counterpart.

Scientific Electronic Library Online (Spanish)