People in the modern society spend most of their time in closed environments due to present day activities and lifestyles. Hence, the air quality inside closed environments plays an important role for maintaining healthy mental and physical conditions. However, the concentration of carbon dioxide has not been used as an index of indoor air quality. It has been reported that the high concentration of carbon dioxide in closed environments affects the human health. The importance of monitoring of carbon dioxide level in closed environments has not yet been fully recognized. The American Society of Heating, Refrigerating and Air-Conditioning Engineers, has set a standard for indoor carbon dioxide concentration as 700 ppm. In the present project, an electronic device was designed to simultaneously measure the carbon dioxide concentration and the relative humidity with ambient temperature. The research was carried out to measure the concentration of carbon dioxide inside vehicles with passengers, functioning laboratories and hospital rooms. Due to human respiration metabolism, carbon dioxide concentration inside those closed environments is continuously increased. Although air conditioners control the indoor temperature and relative humidity, it does not control the concentration of carbon dioxide. The present results show that the carbon dioxideconcentration in all closed environment with people exceeds the limit of 700 ppm. Inside the closed vehicles, the concentration of carbon dioxide increaseover 5000 ppm creating an uncomfortable feeling for passengers. Therefore, the results verify that monitoring and controlling of the carbon dioxideconcentration inside closed environments are important for human health.

Broiler chicken is considered as a major source of dietary protein. The core purpose of this present study was to determine the concentration of Chromium (VI), the harmful form of chromium, in various body parts of broilerchicken.A total of 30 chicken samples (15 large chickens and 15 small chickens) were collected from randomly selected poultry shops of Nabinagar, Dhaka, Bangladesh. Samples were prepared by wet digestion method. Then they were analyzed by atomic absorption spectrophotometer for the presence of hexavalent chromium. Our results showed that, in small chicken the lowest concentration (0.0094ppm ± 0.00049SE) of Cr (VI) was found in the liver, whereas the highest concentration was quantified in the bones (0.0466ppm ± 0.00106SE). In case of large chicken, minimum concentration of Cr (VI) was analyzed in head (0.0447ppm ± 0.00069SE), whereas breast meat showed the maximum concentration, 0.0799ppm ± 0.00068SE. Consumption of healthy chicken meat can meet the need of protein as a basic nutrient and can make available at a cheaper rate to the people of all walk of life.

The principal objective of the present research work is to determine the floristic composition of riverine ecotones and determine the factors responsible for the floristic pattern of two stressed rivers of Valsad district in the northern part of the Western Ghats. We have studied the floristic diversity of the thirteen study area for two years and analyzed the same using ecological models. Floristic diversity of the area is qualitatively determined using the Jaccardian index of various riverine sites, and quantitatively determined by the Important Value Index of trees, and frequency, abundance, and density of herbaceous cover. A total of 221 species were recorded represented by 183 genera of 64 families. We analyzed the difference in vegetation composition between two rivers is mainly due to geological and climatic reason and little anthropogenic influence was also observed. Finding the most prototypical stress factor affecting the floristic diversity of the riverine ecotone of hilly tracks of northern the Western Ghats and creating a database of the same will help in better preservation of biodiversity. This will guide future ecologists and governmental bodies in environmental management.