A computational approach to the D-module of meromorphic functions

Let $D$ be a divisor in ${\bf C}^n$. We present methods to compare the ${\mathcal D}$-module of the meromorphic functions ${\mathcal O}[* D]$ to some natural approximations. We show how the analytic case can be treated with computations in the Weyl algebra.Comment: 11 page

Actualización, pronóstico y medidas de intervención para la tríada de la mujer deportista

El propósito de este artículo fue determinar las medidas a adoptar para prevenir, diagnosticar y tratar la tríada de la mujer deportista. Métodos: Se comparan los reportes de numerosos estudios realizados acerca de las causas, diagnóstico y tratamiento de esta entidad, con experiencia acumulada en la atención a deportistas de alto rendimiento por especialistas que laboran en este campo. Resultados: Se hizo énfasis en los factores predisponentes y desencadenantes de la aparición de la tríada y se proponen medidas preventivas y curativas de intervención. Conclusiones: Se propone una estrategia encaminada a evitar la aparición de este síndrome

Contribution of N-2 fixing cyanobacteria to rice production: availability of nitrogen from N-15-labelled cyanobacteria and ammonium sulphate to rice

This study investigate the potential contribution of nitrogen fixation by indigenous cyanobacteria to rice production in the rice fields of Valencia (Spain). N-2-fixing cyanobacteria abundance and N-2 fixation decreased with increasing amounts of fertilizers. Grain yield increased with increasing amounts of fertilizers up to 70 kg N ha(-1). No further increase was observed with 140 kg N ha(-1). Soil N was the main source of N for rice, only 8-14% of the total N incorporated by plants derived from N-15 fertilizer. Recovery of applied N-15-ammonium sulphate by the soil-plant system was lower than 50%. Losses were attributed to ammonia volatilization, since only 0.3-1% of applied N was lost by denitrification. Recovery of N-15 from labeled cyanobacteria by the soil-plant system was higher than that from chemical fertilizers. Cyanobacterial N was available to rice plant even at the tillering stage, 20 days after N application