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Oxygen isotopic values are helpful to understand if changes in δ13C are linked to plant response to stomatal or biochemical restriction, also clarifying the relationship with water use. 10 Manuela Capano and Simona Altieri In plant tissues, natural values of δ15N reflect the net effect of a variety of processes. They depend on different isotopic values of nitrogen sources, temporal and spatial variations of available nitrogen and changes in plant demand. , NOX). Radiocarbon concentration in atmosphere changes in the years due to anthropogenic (Bombcarbon peaks and Suess effect) and natural factors.

The SPS uses a low-speed water wheel which circulates pond water between a fish compartment and a waste treatment compartment. The water wheel enables the suspension of particulate matter in the water column facilitating nitrogen biogeochemical transformations. The production associated with a SPS is estimated between 20,000 and 30,000 pounds of catfish acre-1; 3-5 times greater than traditional earthen ponds. Nutrient management strategies in both recreational and commercial fish ponds are an essential tool in sustaining quality fish for both sport and economic value in the southeastern United States.

Swami Civil Engineering Department, Malaviya National Institute of Technology JLN Marg, Jaipur, Rajasthan, India RESEARCH SUMMARY Noise has a direct impact on the environment and is a threat to the health and well being of the exposed individuals. Rapid urbanization and industrialization have resulted in increased volume of motorized vehicles which is responsible for about 55% of the total noise in any urban environment. In the present chapter fundamental concepts of noise pollution, modeling and its health effects on exposed individuals and various abatement measures are discussed with the aid of flow diagrams.

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