Outbreaks of enterohemorrhagic Escherichia coli O157:H7 infections associated with lettuce and other leaf crops have occurred with increasing frequency in recent years. Contaminated manure and polluted irrigation water are probable vehicles for the pathogen in many outbreaks. In this study, the occurrence and persistence of E. coli O157:H7 in soil fertilized with contaminated poultry or bovine ...

This study aimed to investigate the in vitro bioaccessibility of vitamin C from various fruits and vegetables. Vitamin 14 8 vegetables was examined under simulated gastrointestinal digestion method. values were analyzed by reverse-phase High-Performance Liquid Chromatography. The initial amounts ranged between 1.9 (yellow apple) 61.8 mg/100 g (strawberry) 3.8 (curly lettuce) 326.9 (purple cabba...

Turnip (Brassica rapa var. rapa L.), beetroot (Beta vulgaris L.) and carrot (Daucus carota L.) are common vegetables in South Africa. The allelopathic potential of aqueous leaf and root extracts of Aloe ferox Mill.a highly valued medicinal plantwas evaluated against seed germination and seedling growth of the three vegetables in Petri dish experiments. The extracts were tested at concentrations...

The largest open reading frame of the turnip yellow mosaic virus RNA genome encodes a 206-kDa protein that is cleaved to yield N-terminal 150-kDa (p150) and C-terminal 70-kDa (p70) proteins. Using a genomic cDNA clone capable of generating infectious transcripts in vitro, we have introduced substitution, frameshift, and in-frame deletion mutations into the regions encoding both proteins. None o...

The interactions between vernalization and photoperiodic effects on the flowering of 12 turnip varieties were examined under controlled environment. Seedlings of all varieties bolted and flowered under a long-day condition of 24 h day-length (LD) when the germinated seeds had been pre-exposed to low temperature at 3 •Ž (LT) for 30 days. Under the LD condition, the ratio of flower formation of a...