An in vitro study was performed to ascertain the marginal seal elemental composition of amalgam restored extracted teeth of known marginal leakage. Occlusal cavities were cut in 400 caries free extracted teeth and left unlined or lined with one of 5 bases. A varnish was applied to half the cavities followed by restoration with a low copper or high copper amalgam to produce 20 restoration combin...

the quantitative performance of wheat crop under 1-5 year old poplar plantations in irrigated agro-ecosystem was studied to ascertain the biological yield of tree and crop. results revealed that growth and yield of wheat decreased significantly with the increase in poplar age. the per cent reduction in net grain yield was 17% under one year old poplar plantation, which increased to 52.15% under...

The biofuels debate in the European Union has long been seen as a battle between politicians intent on finding a viable alternative to fossil fuels and campaign groups that claim the creation of biofuels creates potential environment damage, cuts into food production, and may be of limited effect in tackling climate change. But in a move to acknowledge concerns about the increasing complexity s...

Large-scale cattle and crop production are the primary drivers of deforestation in the Amazon today. Such land-use changes can degrade stream ecosystems by reducing connectivity, changing light and nutrient inputs, and altering the quantity and quality of streamwater. This study integrates field data from 12 catchments with satellite-derived information for the 176,000 km(2) upper Xingu watersh...

the recent decades emphasis on reducing pesticide use especially herbicide has led to increased interest in alternative weed control methods. the purpose of this study was to evaluate the hilling time and simultaneous interseeding of two cover crops as living mulch to control weeds in potato and to determine the impact of these actions on potato yield. a randomized complete block design as spli...

inoculum containing 80 cells. Over 5 million cells were needed to give 100 per cent takes. With mouse adenocarcinoma db & B, the smallest num ber of cells necessary to induce tumors was eight een (three takes out of 57 mice). For 50 per cent takes, 300 cells were necessary; for 100 per cent takes, 2,590 cells were required (4). Hewitt (1), working with a cell suspension of a spindle-cell carcin...

an investigation of the incidence of colour defects was made in primary school students. the children ranged in age from 7 to 14 years. the frequencies were 7,04 per cent. for males and 0,53 per cent. for females.

The development of duplex scanning carries the prospect of an entire non-invasive work-up of patients with peripheral arterial occlusive disease. To obtain the best available estimates of its diagnostic accuracy, a meta-analysis of 71 studies evaluating duplex scanning was performed. Independent methodological judgement left 16 studies for data extraction. Pooled estimates (95 per cent confiden...

Harvester ants often selectively forage seeds, causing these to be viewed as pests in agricultural areas where they may on crop seeds. While little research has been done harvester ant preferences for cover grower observations the Lower Rio Grande Valley (LRGV) suggest that remove seeds before germination. We examined red (Pogonomyrmex barbatus F. Smith) (fescue, oat, sunn hemp, radish, vetch, ...