E-waste scenario in India, its management and implications.

Electronic waste or E-waste comprises of old, end-of-life electronic appliances such as computers, laptops, TVs, DVD players, refrigerators, freezers, mobile phones, MP3 players, etc., which have been disposed of by their original users. E-waste contains many hazardous constituents that may negatively impact the environment and affect human health if not properly managed. Various organizations, bodies, and governments of many countries have adopted and/or developed the environmentally sound options and strategies for E-waste management to tackle the ever growing threat of E-waste to the environment and human health. This paper presents E-waste composition, categorization, Global and Indian E-waste scenarios, prospects of recoverable, recyclable, and hazardous materials found in the E-waste, Best Available Practices, recycling, and recovery processes followed, and their environmental and occupational hazards. Based on the discussion, various challenges for E-waste management particularly in India are delineated, and needed policy interventions were discussed.

A roadmap for development of sustainable E-waste management system in India.

The problem of E-waste has forced Environmental agencies of many countries to innovate, develop and adopt environmentally sound options and strategies for E-waste management, with a view to mitigate and control the ever growing threat of E-waste to the environment and human health. E-waste management is given the top priority in many developed countries, but in rapid developing countries like India, it is difficult to completely adopt or replicate the E-waste management system in developed countries due to many country specific issues viz. socio-economic conditions, lack of infrastructure, absence of appropriate legislations for E-waste, approach and commitments of the concerned, etc. This paper presents a review and assessment of the E-waste management system of developed as well as developing countries with a special emphasis on Switzerland, which is the first country in the world to have established and implemented a formal E-waste management system and has recycled 11kg/capita of WEEE against the target of 4kg/capita set by EU. And based on the discussions of various approaches, laws, legislations, practices of different countries, a road map for the development of sustainable and effective E-waste management system in India for ensuring environment, as well as, occupational safety and health, is proposed.

Characterization of a structural model of membrane bound cytochrome c-550 from Bacillus subtilis.

A structural model of Bacillus subtilis cytochrome c-550 has been built based upon hydropathy analysis, sequence alignment, homology modeling, and energy minimization. The model has a single transmembrane alpha-helix and a water-soluble domain folded around covalently attached heme C. Physical measurements on purified, recombinant cytochrome c-550 have been made to test aspects of the model. Excitation at either 280 or 295 nm yields fluorescence with an emission maximum at 334 nm and a quantum yield of 25% relative to n-acetyltryptophanamide. The model places one (i.e., W115) of the two tryptophans of cytochrome c-550 in the heme domain and the second (i.e., W3) in the transmembrane domain. The indole ring of W115 is within 5 A of the heme macrocycle and is expected to be highly quenched via resonance energy transfer to the heme. In contrast, W3 is at the start of the putative transmembrane helix and could be located a considerable distance from the heme. Förster theory assigns a distance of 42 A from W3 to the heme. This distance is important in adjusting the relative positions of the membrane-spanning and heme-binding domains. Circular dichroism measurements in the ultraviolet region indicate increased alpha-helical content of B. subtilis cytochrome c compared to mitochondrial cytochrome c in support of an alpha-helical transmembrane domain. The ionic strength dependence of redox kinetics for cytochrome c-550 indicates an overall negative charge that is consistent with a calculated pI of 5.4. However, the charge distribution specified by the model indicates a surface for electron exchange that is different from the classical front face used by mitochondrial cytochrome c.