College for Women, India. Toxicity is the degree to which a substance can damage an organism. Neither do we think of its origin nor its manufacturing process and the toxic load on our body and on environment. The purpose for writing this article is to make the people aware of harmful and dangerous effects of synthetic and semi-synthetic fibres. In older times, most of the fabrics used were made from the fibres that were derived from natural sources like cotton, wool, silk and jute. Those fibres were traditional, ecofriendly and non-toxic to wear by any means.
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Plastics have transformed everyday life; usage is increasing and annual production is likely to exceed million tonnes by In this concluding paper to the Theme Issue on Plastics, the Environment and Human Health, we synthesize current understanding of the benefits and concerns surrounding the use of plastics and look to future priorities, challenges and opportunities. It is evident that plastics bring many societal benefits and offer future technological and medical advances. However, concerns about usage and disposal are diverse and include accumulation of waste in landfills and in natural habitats, physical problems for wildlife resulting from ingestion or entanglement in plastic, the leaching of chemicals from plastic products and the potential for plastics to transfer chemicals to wildlife and humans. However, perhaps the most important overriding concern, which is implicit throughout this volume, is that our current usage is not sustainable. Around 4 per cent of world oil production is used as a feedstock to make plastics and a similar amount is used as energy in the process. Yet over a third of current production is used to make items of packaging, which are then rapidly discarded. Given our declining reserves of fossil fuels, and finite capacity for disposal of waste to landfill, this linear use of hydrocarbons, via packaging and other short-lived applications of plastic, is simply not sustainable. There are solutions, including material reduction, design for end-of-life recyclability, increased recycling capacity, development of bio-based feedstocks, strategies to reduce littering, the application of green chemistry life-cycle analyses and revised risk assessment approaches.
A nut is a type of fastener with a threaded hole. Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together. The two partners are kept together by a combination of their threads' friction with slight elastic deformation , a slight stretching of the bolt, and compression of the parts to be held together. In applications where vibration or rotation may work a nut loose, various locking mechanisms may be employed: lock washers , jam nuts , specialist adhesive thread-locking fluid such as Loctite , safety pins split pins or lockwire in conjunction with castellated nuts , nylon inserts nyloc nut , or slightly oval-shaped threads. Square nuts, as well as bolt heads, were the first shape made and used to be the most common largely because they were much easier to manufacture, especially by hand. While rare today [ when?