Soon, robotic plants that can grow roots



LONDON: Plantoid! Plants may soon have robotic counterparts, thanks to Italian researchers who are developing a system that mimics the behaviour of roots.


Researchers unveiled a project called PLANTOID to build a machine that grows roots - just like a plant does.

The team led by Barbara Mazzolai from the Italian Institute of Technology in Genoa plans to use bespoke soft sensors for underground exploration, tips that grow by unwinding material and a mechanism to reduce friction when penetrating the soil.

The artificial plant system will be equipped to detect gravity, water, temperature, touch, pH, nitrate and phosphate, 'NewScientist' reported.

According to researchers, modelling a growing root is difficult as it bends while increasing in length, adding cells on the opposite side from the direction in which it is heading.

A root perceives several physical and chemical stimuli at once and prioritises them, researchers said.

"The mock-ups and prototypes we've developed aim to validate some of the functions and features of plant roots," said Mazzolai.

In addition to mimicking a single root, researchers are also looking at how roots interact with each other, coordinating their movements through soil.

"New findings could be the basis for novel swarm intelligence," said Mazzolai.

The system could produce more energy-efficient robots that can adapt to their environment, the report said.

Plant-like robots can be used in environmental monitoring, and their knack for exploration and ability to anchor themselves could have applications in space.

Such a system can also find use in medicine, for example as flexible, growing endoscopes that can move easily inside a human body.


Study reveals origin of India’s caste system



Study reveals origin of India’s caste system
The study was carried out by Harvard Medical School and the CSIR-Centre for Cellular and Molecular Biology (CCMB) in Hyderabad.
India's caste system, says a new genetic study, began about 2,000 years ago. The study adds that people from different genetic populations — from the North and the South — began to mix with each other about 4,200 years ago but that the mixing stopped about 2,000 years ago.

The study was carried out by Harvard Medical School and the CSIR-Centre for Cellular and Molecular Biology (CCMB) in Hyderabad. David Reich, a professor of genetics at Harvard Medical School, said that the caste system in India has been around for a long time, but that it had certainly not begun right at the very beginning.

Reich's 2009 study, based on an analysis of 25 different Indian population groups, found that all populations in India showed evidence of a genetic mixing of two ancestral groups — the Ancestral North Indians (ANI), who are related to central Asians, middle easterners, caucasians, and Europeans ; and the Ancestral South Indians (ASI), who are primarily from the subcontinent.

In the beginning, when the ANI and ASI populations mixed, their chromosomal segments would have been very long. But when the two groups began to intermarry, the chromosomal segments would have broken up at one or two places per chromosome, per generation, thus recombining maternal and paternal genetic material.

The researchers, by measuring the lengths of the segments of ANI and ASI ancestry in Indian genomes, were thereby able to obtain precise estimates of when this population mixture occurred. They found that it started 4,200 years ago — the Indus Valley civilisation was waning then, and huge migrations were occurring across north India, which might have caused the intermarrying . It is suspected that before that, the two groups lived side by side for centuries without intermarrying.

The researchers said the mixing was thorough, with even isolated tribes showing ancestry from both groups.

Lalji Singh, a former researcher at CSIR-CCMB , said: "The fact that every population in India evolved from randomly mixed populations suggests that social classifications like the caste system are not likely to have existed in the same way before the mixture happened."

The intermarrying stopped about 2,000 years ago. The Manusmriti , forbidding intermarriage across castes, was written around 100 BC.

The researchers added that once the caste system was established, it became genetically effective, and mixing across groups became very rare.

New laser 'death test' predicts how long you have left to live


LONDON: Scientists have designed a non-invasive test called the "death test" - the first of its kind in the world - which can tell people how long they have left to live

A painless laser pulse is applied to the surface of the skin through a wristwatch-style device.

This measures how a person's body will decline with age by analysing endothelial cells.

These cells line the smallest blood vessels, capillaries, in our bodies and respond to complex activity elsewhere in the body.

By measuring the oscillations within the cells, the scientists say they can calculate the length of time before death and also test for diseases including cancer and dementia, the Sunday Times reported.

The result is graded from 0 for death to 100 for optimum functioning. The predictions become more accurate as more data is added.

A user-friendly version of the system is expected to be completed within the next three years. 
 
 
 
 

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