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Articles by R.K.Robinson
Total Records ( 2 ) for R.K.Robinson
  M.S.Y. Haddadin , S. Khattari Daniela Caretto and R.K.Robinson
  Although it is alleged that lithium is not toxic to humans below an intake of 500 mg day -1, test animals have been affected at levels as low as 50 mg kg-1 of feed. This study sought to establish whether fruits grown in the Jordan Valley could accumulate sufficient lithium for consumers to reach a target of 50 mg day-1. The mean soil levels of extractable lithium were 13.1, 20.3 and 25.4 mg kg-1 in three different growing regions of the Valley, while the highest levels in citrus fruits were 51.3 mg kg-1 in clementines (Citrus mitis) and 49.4 mg kg-1 in the lemon (Citrus limon). As the latter values were on a dry weight basis, the risk of lithium toxicity would appear to be minimal but, equally important, deficiency syndromes should not be manifest either.
  J. H. Al-Jedah and R.K.Robinson
  The nutritional value of ten fresh fruit juices purchased from retail outlets in Doha, Qatar was calculated on the basis that approximately 100 g of fruit is used to make one glass of juice (250 ml). Avocado juice was the best source of energy and potassium followed by banana juice, while guava juice was an outstanding source of vitamin C and carotene. By contrast, the microbiological quality of all the products was well outside the Gulf Standards for fruit juices, and coliform counts usually exceeded 1,000 cfu ml -1. In one sample of mixed fruit juice, the coliform count was above 1.0 x 106 cfu ml -1, and both Escherichia coli and Enterococcus faecalis (1.0 x 107 cfu ml -1) were detected. It is concluded that, while the practice of consuming fresh fruit juices with meals should be encouraged on nutritional grounds, steps must be taken to improve the microbial quality of the products.
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