Measurements of benzo(a)pyrene in the city of Bombay for the evaluation of carcinogenic risk

Cigarette smoking, environmental chemicals and ionizing radiations are the three factors known to cause cancer in human beings. The relative importance of each of these is being constantly evaluated. There is an urgent need to monitor the environmental carcinogens on a large scale to assess the role of environmental chemicals in the incidence of cancer in human populations. Polycyclic aromatic hydrocarbons (PAH) are released into the atmosphere as a result of fossil fuel combustion and some of the PAH (e.g. benzo(a)pyrene) are recognised carcinogens. Measurement of benzo(a)pyrene in urban, suburban and rural regions of Bombay is carried out in order to evaluate the possible correlation with lung cancer incidence among different population groups. The variations in the concentration at the three sampling locations are discussed. The wide differences in the concentration at different locations seem to be very suitable for epidemiological investigations.     

Voltage and temperature sensing applications of silver-doped GE17Te83

This paper reports measurements that show silver-doped amorphous chalcogenide (Ge₁₇Te₈₃) is a promising material for sensing voltage and temperature and at frequencies >1 kHz, it can be used as a voltage-variable capacitor (varactor). The bidirectional and nearly-linear behaviour of itsC–V plot, obtained at relatively low operating voltages, makes silver doped chalcogenide superior to conventional varactors (reverse-biased p-n diodes) which are normally used in integrated circuits. At lower frequencies <1 kHz, the a.c. resistance of the doped sample displayed sensitivity not only to voltage but also to temperature. Such a property makes the doped material useful for devices used in biasing and automatic-gain-control circuits.     

A thymine-based molecular structure to design logic gates and memory devices

Journal of Computational Electronics - A computational study is carried out on thymine using the two-probe method. A&nbsp;thymine molecule with thiol anchors is sandwiched between two gold...