Dimethyl sulphoxide effect on division cells

Resumen Dimetil sulfóxido, potente antimetabolito, a distintas concentraciones altera significativamente la cinética de poblaciones meristemáticas radicales deAllium cepa L., produciendo un cuatro de alteraciones morfológicas y figuras mitóticas atípicas.     

Acetaldehyde induces mature endoreduplicatedAllium cepa root cells to divide

Summary InAllium cepa root tips treated with acetaldehyde, metaphase cells showing diplochromosomes are occasionally observed. The short treatment time excludes the possibility that the endoreduplication has been induced by the chemical. Instead, it seems that acetaldehyde is able to stimulate, directly or indirectly, the division of mature cells previously endoreduplicated.     

数据库系统冗余数据的查找和删除

分析了目前对于冗余数据的常用处理方法，并给出了基于SQL的解决数据库冗余数据方案。     

Monoacylcadaverines as substrates for both monoamine oxidase and diamine oxidase; low rates of activity

Summary Monoacetylcadaverine and monopropionylcadaverine were found to be substrates for both rat liver monoamine oxidase and hog kidney diamine oxidase, but all the K_m-values for the oxidases were very high. The amines were common substrates for type A and type B monoamine oxidase.     

The occurrence of ¦ bipolar neurons in the abdominal mass ganglia of a pulmonate mollusc (Cryptomphallus aspersa)

Resumen Se describen en la masa ganglionar ventral del moluscoCryptomphallus aspersa (Gasteropoda, Pulmonata) la presencia de varios tipos de neuronas bipolares entremezcladas con las típicas unipolares. Estas observaciones morfológicas se discuten en relación a los hallazgos obtenidos previamente con técnicas electrofisiológicas por otros autores.