RESUMEN
Resumen: El actual desarrollo científico y tecnológico, que ha permitido aumentar el tiem po de vida en condiciones saludables, ha conducido a una reconfiguración de la vida y la vejez. Esto ha generado nuevas preguntas sobre el sentido de esa vida alargada en el tiempo. El artículo analiza cómo, a través del jovenismo y el consumismo, se ha entronizado el ideal de eterna juventud, denigrando la vejez, medicalizando la vida y creando una obsesión por la cosmética y la estética. En últimas, se evidencia que la búsqueda de la abolición de la vejez responde al intento de disolver la muerte.
Abstract: The current scientific and technological development, which has made it possi ble to increase life span in healthy conditions, has led to a reconfiguration of life and old age. This has raised new questions about the meaning of this extend ed life. The article analyzes how, through youthfulness and consumerism, the ideal of eternal youth has been enthroned, by denigrating old age, medicalizing life, and creating an obsession with cosmetics and aesthetics. Ultimately, it is evident that the search for the abolition of old age responds to the attempt to dissolve death.
RESUMEN
This study aimed to enhance the durability of selected green leafy vegetables, including Lettuce and Palak, by manipulating influential factors such as storage conditions (Ambient (35±5°C) and Refrigerated (5±5°C)), packing substrate (Low-density polyethylene and High-density polyethylene covers), and gas composition using modified atmosphere packaging. Factorial completely randomized design (FCRD) was employed, incorporating a total of 12 treatments for each crop. The evaluation primarily relied on calculating physiological weight loss. Lettuce showed optimal results with treatment T5 (0.38%) exhibiting superior performance, followed by T6 (0.45%) and T3 (0.58%) under ambient conditions. Similarly, for palak, T5 (0.18%) outperformed T3 (0.19%) and T2 (0.37%). Thus, it is advisable to adopt T5 (R1G3M1) as the preferred treatment with T3 (R1G2M1) as a viable alternative for ambient storage conditions. Refrigerated lettuce performed optimally with T11 (0.54%) leading, followed by T7 (0.56%) and T9 (0.69%). Similarly, palak exhibited superior results with T9 (0.61%) in the fore, succeeded by T11 (0.77%) and T7 (0.97%). Notably, produce stored under ambient conditions had a relatively short shelf life of approximately 5 days, while refrigeration extended it to 15 days, after which a decline in quality was observed across all treatments. Therefore, refrigerated produce has an extended shelf life, with T9 (R2G2M1) followed by T7 (R2G1M1) yielding highly favorable outcomes.
RESUMEN
Effects of copulation and male size on the oviposition behavior of the manure fly Archisepsis diversiformis (Diptera: Sepsidae). I evaluated the effect of copulation as a stimulation factor for oviposition of Archisepsis diversiformis by using two different age groups of females. In addition, I tested the effect of copulation on female longevity and progeny sex ratio, taking into account female and male size, and oocyte development in relation to female age. A delay in copulation leads to a delay in oviposition. Females of both age groups started to oviposit between four and five days after copulation. The number of eggs that were laid during the first ten days after copulation, the average number of ovipositions (number of eggs laid per day) during the females life, and the average time between ovipositions were all similar. I found further evidence for the effect of copulation on oviposition: when females copulate, they oviposited faster than virgin females. In addition, these females laid a lower number of eggs after the age of 13 days, while females of the same age (that have copulated before, when they were two or six days old) laid a higher number of eggs (an average of 75 eggs). Oocytes in virgin females became larger with age; 57 % of the variation in the number of eggs laid by females depends on females longevity. As in other studies, female size had an effect on the total number of eggs laid. However, male size significantly affected the oviposition rate (total number of eggs/female longevity). Females tended to have a higher oviposition rate after copulating with larger males. These data suggest that for this fly species, sexual selection through female choice might be occurring. Rev. Biol. Trop. 57 (Suppl. 1): 239-250. Epub 2009 November 30.
Se evaluó el efecto de la cópula como factor estimulante de la oviposición en Archisepsis diversiformis utilizando hembras de dos edades, y en la longevidad de la hembra y en la proporción sexual de la progenie, tomando en cuenta el tamaño de hembra y macho, y el desarrollo de los ovocitos en relación a la edad de la hembra. Se demostró que una demora en copular indujo una demora en oviponer. También hubo similitud en el número de huevos puestos en los diez primeros días después de la cópula, en el número promedio de posturas (grupo de huevos puestos por día) durante toda la vida de una hembra, y en el tiempo promedio transcurrido entre posturas. Otra evidencia del efecto de la cópula en la ovipostura, fue que las hembras que copularon ovipositaron más rápido que las vírgenes. Además, éstas colocaron un número muy bajo (en promedio 14) de huevos a partir de los 13 días de edad, mientras que hembras de esta misma edad (que previamente habían copulado a los dos o seis días de edad) colocaron un mayor número (en promedio 75) de huevos. Como en otros estudios, el tamaño de la hembra tuvo un efecto significativo sobre el número total de huevos puestos. Sin embargo, el tamaño del macho afectó significativamente la tasa (Nº total de huevos/duración de la vida de la hembra) de ovipostura. Estos datos sugieren la posibilidad de que la selección sexual por elección femenina actúe en hembras de esta especie de mosca.