Heavy metals are nothing but any metallic chemical element that has a relatively high molecular weight. But unlike normal metals, they are toxic or poisonous even at very low concentrations. Moreover, they have a propensity to accumulate in selective body organs and cause irreversible damage.
Pollution is a problem which exists in every part of the developed and developing world which further causes harm to the ecosystem. Cleaning up of such contaminated sites is a must to nurture human health and environment.
The horizon for treatment of wastewater has expanded with the Namami Gange Project. Bioremediation with the help of microbes is the simple and most effective way out.
India has been an agricultural nation since time immemorial. Agriculture is the part and parcel of this nation’s rich cultural heritage. As of 2011, India had a large and diverse agricultural sector, accounting, on average, for about 16% of GDP and 10% of export earnings.
We read about radioactivity and its possible hazards in a previous post. We also learnt about a bacterium Deinococcus radiodurans and its ability to survive high intensity radiation, which is otherwise lethal to all life forms. This article features the applications of the strain in bioremediation of radioactive waste as well as sites.
Solid state fermentation (SSF) is a technology which is used for cultivation and production of micro-organisms onto a solid surface in presence of very less or no free water. The solid substrate used in SSF resembles the natural habitat of some of the microbes. The substrate which are used in this technology are mostly of two types, one is nutritional substrate and other is inert material. In case of natural substrates, the substrate itself provides the required nutrients for growth and development of the microbes. Commonly used substrate are cereal husk, oil cakes, residual biomass generated in agriculture sector, etc. Inert materials are the one which provides supports for the microbial adherence on its surface. The inert materials have to be provided with additional source of nutrients.some of the commonly used inert materials are silica, hydrated magnesium silicate salts like Talc, Polyurathrane foam, etc.
“When one tugs at a single thing in nature, he finds it attached to the rest of the world”
We often wonder of the world beyond our skies, heavenly bodies and extra terrestrial life; but we seldom stop and think of the bountiful universe beneath our feet. We have this universe to thank, for the food we eat, the clean air we breathe, quite literally for our very existence. Along with organic matter, decaying material and inorganic components of the soil, are present billions of lively microbes that are responsible for the continuos replenishment of our soils.