A combination of tebuthiuron (25%) and diuron (50%) called Bimate* was evaluated for pre-emergence and postemergence weed control. An early post-emergence application was the best treatment. No phytotoxicity to either plant or ratoon cane was recorded when the recommended rates of 4,O kg of Bimate per ha were used on soil containing 8 to 30% clay, and 5,O kg of Bimate per ha on soil containing ...

INTRODUCTION Exposure to pollutants such as pesticides and heavy metals has been linked to health problems. Several studies have revealed the presence of these contaminants in Cali; however, there is no information available about the main routes of exposure and risk of these contaminants. OBJECTIVE To estimate the risk associated with the intake of cadmium, lead and mercury, and pesticides 2...

The hliA gene of Synechococcus, encoding a photoprotective high light inducible polypeptide, is up-regulated by high light (HL) or low intensity blue/UV-A light (BL). hliA expression was found to be up-regulated by KCN in low light (LL) (but not in the dark), and up-regulation in HL, BL, and LL (with KCN) was inhibited by 2,5-dibromo-3-methyl-6-isopropyl-benzoquinone. A working hypothesis is pr...

The light-dependent pH changes in the suspending medium of guard cell protoplasts (GCP) from Vicia faba were studied. Upon illumination, the medium was initially slightly alkalinized and then acidified. The extent of alkalinization was lower in CO(2)-free air than in normal air. This initial alkalinization was inhibited by DCMU. Acidification in CO(2)-free air became observable in shorter durat...