Manu Prakash, an assistant professor of bioengineering
at Stanford University, and two of his students have re-imagined the
microscope to come up with a nifty device that’s printed on paper and
folded like origami.
Traditional theory has it that the origin of complex life on earth was
catalysed by oxygenation of the atmospheric and ocean. Scientists now
counter this argument to suggest that in fact they were the first life
forms, such as sponges, which oxygenated the deep oceans and aided in
the evolution of complex life forms.
The ocean contained sufficient levels of oxygen to support life for over
1.5 billion years before the first animals evolved. Yet, the oxygen so
found was restricted to the upper few metres of the ocean. The ocean
depths, including the bottom of the water body, continued to remain
anoxic till half a billion years ago.
Central to determining the oxygen levels in deep oceans is the delicate
balance between oxygen supply and demand. The demand shoots up when
organic matter in the form of dead organic material settles to the
bottom. Sponges that were found in the continental shelf of the ocean
played a crucial role in reducing the oxygen demand by the dead organ…
The Supreme Court on Wednesday declined to review its
January 21 verdict, commuting the death sentence of 15 convicts to life
term because of inordinate delay on the part of the President in
disposing of their mercy petitions.