Toxic metals in imported fruits and vegetables marketed in Kuwait

The contentration of lead, cadmium, and mercury in 134 samples of imported fruits and vegetables marketed in Kuwait were determined using an atomic absorption spectrophotometer with a graphite furnace and the cold vapor technique. Results obtained showed that the concentration of these metal ions in most cases did not exceed the maximum permissible concentration of metals in fresh fruits and vegetables as restricted by some countries. Only a few samples of fruits and vegetables contained levels of mercury, cadmium, and lead which exceeded these maximum permissible levels.     

红树植物对养殖水体中营养盐和浮游植物的影响

对深圳沙井镇9个种植红树的鱼塘和一个无红树植物的对照塘水体中营养盐及浮游植物进行了为期1 a的调查研究.结果表明：在鱼塘中种植红树植物能有效降低养殖水体中的营养盐浓度,种植不同种类及不同面积比例红树的鱼塘对N、P营养盐的降低效果无明显的差异,对照塘中浮游植物的密度和生物量均高于种植红树的鱼塘,其初级生产力亦远高于实验塘.     

The adaptive function of ammonia and guanine in the biocoenotic association between ascomycetes and flour mites (Acarus siro L.)

The Science of Nature -     

Sonographic diagnosis of fetal congenital cataracts

Five fetuses with congenital cataracts diagnosed in utero by ultrasound are reported. The fetuses, who were between 14 and 27 weeks' gestation, also had other severe malformations. The sonographic features of the cataracts are presented.