Seasonal variation of the ionic alkyllead species composition of rainwater

Article Abstract:

A study of the seasonal variations in the concentration levels of ionic alkyllead species in rainwater analyzed 57 samples over a 1.5-year period. The research indicated that concentration levels were lower during the summer. This was probably caused by a higher rate of atmospheric photochemical degradation. The study of concentration levels can help to determine a biogeochemical cycle of lead and to identify the negative biological and environmental effects of tetra-alkyllead compounds used in gasoline.

Contamination, Ionic solutions, Rain-water (Water-supply), Rainwater

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Relationship between alloy composition and tool-life of high-speed steel twist drills

Article Abstract:

The influence of the alloy composition of high-speed steel twist drills on the devices' performance are studied by means of tool-life tests. Experiments are conducted wherein several alloy-treated high-speed steel matrix twist drill specimens with low residual carbide content are fabricated and subjected to actual tooling processes. Results show that the drills' tool-life depends largely on the structures' matrix properties rather than their alloy composition.

Analysis, Alloys, Electric drills, Tool-steel, Tool steel

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Seasonal control of tuberization in potato: Conserved elements with the flowering response

Article Abstract:

The progress in the identification of the molecular mechanisms that define the day-length recognition in potato is described. Results show that common regulatory pathways are involved in both flowering and tuberization photoperiodic responses in plants.

United States, Potatoes, Potato Farming, Irish potatoes, Physiological aspects, Genetic aspects, Potato, Tubers

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