Abstract-The photodegradation of two phenylurea herbicides monuron 3-(4-chloropylphenyl)-1,1 dimethylurea) and isoproturon (3-(4isopropylphenyl)-1,1 dimethylurea) in an aqueous solutions containing nitrates (10 M) and nitrites (10 M), using irradiation at 310 nm and at 365 nm respectively is investigated. In both cases MN (10 M) and IP (10 M) photodegradation followed pseudo-first order kinetic...

Urinary tract infections are common in infancy and childhood and may indicate an underlying urological problem requiring treatment. The standard method for the diagnosis of urinary tract infection remains the microscopic examination and quantitative culture of a clean catch specimen of urine, but recently a dipstick has become available that tests for two markers of infection-leucocyte esterase...

Nitrite poisoning in pigs was suspected when 4 of 18 pigs died in a piggery near Ellisras in the Northern Province. The pigs showed typical brownish discolouration of the blood at autopsy. It was established that they ingested vegetable tops and weeds from the adjacent garden as part of their daily ration. Of the available plants, only Capsella bursa-pastoris contained nitrites. The drinking wa...

Alkyl nitrites readily transfer nitrosonium into calixarene-based synthetic nanotubes thus offering a mild, effective and precise method to fill them.