Underwater adhesives, Disappearing frogs and Electric Eels

Hello Folks! As promised, here is part II of our roundup of the most interesting breakthroughs in the world of science in the last couple of weeks. If you missed Part I, you can read it here. You will learn about mysterious brain cells of male roundworms, methods for remote-controlling cancer-fighting immune cells, the latest findings concerning Pluto by the New Horizons spacecraft, and much more.

And now, for the rest.

A glue inspired by nature

<a href="">Mhy</a> / Pixabay

Making glues that work underwater has long been a challenge for chemical engineers. Since a long time, researchers have been trying to exploit their knowledge of marine mussels to overcome this problem. Mussels stick to rocks in shallow waters using thread-like processes and can withstand battering by heavy waves without losing their grip. They do this by using a family of proteins, called mussel foot proteins (mfps) which they secrete near their points of contact with the rocks. A lot of interest, therefore, lies in uncovering the special properties of mfps that allow them to adhere underwater. Chemically, the main suspects are modified amino acids called catechols, the presence of large numbers of positive and negative charges in the same protein, and non-polar, hydrophobic elements interspersed throughout. Researchers at University of California, Santa Barbara, decided to strip away all the extraneous stuff and design a single small molecule that would incorporate all these components. This they achieved by chemically modifying a zwitterionic (having both positive and negative charges) detergent molecule to include the important catechol group alongside a few other small modifications. When this new material was tested for its stickiness, is was found to be highly adhesive, much stronger than the mfp proteins themselves, and could easily stick underwater forming a thin, uniform layer. According to the scientists, this might have important applications in the field of nanofabrication.

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New Horizons, Mysterious male neurons, and Remote-controlled T-cells

Hi everyone! I missed making a post on the last two Sundays, so today I’m bringing you a bunch of interesting discoveries that occurred over the last two weeks. Or rather, I am bringing you half of those stories, because there are simply too many to include in one post. I’ll be posting Part II in a day or two, so stay tuned for that.

Let’s begin!

Pluto Spills its secrets

A close-up of Pluto’s surface, taken by New Horizons

The New Horizons spacecraft was launched from Cape Canaveral on January 19, 2006 with a mission to make a close flyby of objects in the Kuiper belt, the dark outer frontier of our solar system. By far, the most interesting target was Pluto, the erstwhile planet, of which we only had data from distant astronomical observations till now. New Horizons took about thirteen months to reach Jupiter and then used Jupiter’s gravity to get a boost in speed before making a beeline for Pluto. On July 14, 2015, it made its closest approach to Pluto, after having transmitted images and data relating to it for a period of almost six months. This month, the results from the flyby were published in the journal Science, exposing a wealth of new information.

For starters, Pluto seems to be unusually geologically active for a planet of its size and status. Its surface is dotted with craters alongside deep features like mountains that can only be formed as a result of tectonic activity and the presence of hard bedrock. The surface of Pluto is covered with nitrogen, carbon monoxide and methane ice, which do not fit the requirement for hard bedrock, and hence this suggests the presence of a harder substance below the surface layer – most likely water-ice. Also, certain parts of Pluto’s surface show really few craters, suggesting that these regions were formed relatively recently – strong evidence for continuing geological activity. Intriguingly, in certain places, the scientists even reported seeing ‘glacier-like’ features.

PIA18179 d-Pluto270-Hubble2003-20100204Pluto-01 Stern 03 Pluto Color TXTAnother surprising discovery was the extent of Pluto’s atmosphere – with an almost 150 Km deep atmospheric ‘haze’ clearly visible above the surface. The surface pressure is low, about 10 microbar (for comparison, atmospheric pressure at the earth’s surface is approximately 1 bar, about 100,000 times that of Pluto). Methane and Nitrogen were among the gases detected. In addition to studying Pluto, New Horizons also took high resolution photos of Pluto’s biggest moon, Charon. Charon also shows evidence of tectonic activities, and has several large craters on its surface. New Horizon also sent back information about two more moons of Pluto – Hydra and Nyx – which are tiny, irregularly shaped satellites, whose highly reflective surfaces indicate that they are mostly covered with water-ice.
Till the New Horizons flyby, the highest resolution image we had of Pluto is the one shown on the top left, taken from the Hubble Space Telescope. Compare it to the latest images released by NASA (top right), if you want to know how much the recent flyby has added to our knowledge of this controversial member of our solar system.

Mysterious male neurons of C. elegans

Caenherrobditis elegans is a small soil-living roundworm (also called a nematode) found in temperate zones. In 1974, the famous South African geneticist Sydney Brenner, proposed the use of C. elegans as a model system for studying development in multicellular organisms.

Read moreNew Horizons, Mysterious male neurons, and Remote-controlled T-cells

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