How extended space flights affect astronauts’ brains

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New York, May 5 | Long-duration space flight can alter fluid-filled spaces along veins and arteries in the brain, according to new research.

Researchers from Oregon Health & Science University (OHSU) imaged the brains of 15 astronauts before and after extended tours of duty on the International Space Station (ISS).

“The findings have important implications as we continue space exploration,” said Juan Piantino, Assistant Professor of Paediatrics (Neurology) in the OHSU School of Medicine.

“It also forces you to think about some basic fundamental questions of science and how life evolved here on Earth.”

The team used magnetic resonance imaging to measure perivascular space – or the space around blood vessels – in the brains of astronauts prior to their launch and again immediately after their return.

They also took MRI measurements again at one, three, and six months after they had returned. Astronauts’ images were compared with those taken of the same perivascular space in the brains of 16 Earth-bound control subjects.

Comparing before and after images, they found an increase in the perivascular spaces within the brains of first-time astronauts, but no difference among astronauts who previously served aboard the space station orbiting earth.

It is because experienced astronauts may have reached some kind of homeostasis – a self-regulating process by which biological systems maintain stability while adjusting to changing external conditions, said Piantino, in the paper published in the journal Scientific Reports.

In all cases, scientists found no problems with balance or visual memories that might suggest neurological deficits among astronauts, despite the differences measured in the perivascular spaces of their brains.

Further, the team decided to find out by measuring perivascular spaces, where cerebrospinal fluid flows in the brain.

These spaces are integral to a natural system of brain cleansing that occurs during sleep. Enlargement of these spaces occurs in ageing, and also has been associated with the development of dementia.

Researchers used a technique to measure changes in these perivascular spaces through MRI scans.

Piantino said the study could be valuable in helping to diagnose and treat Earth-bound disorders involving cerebrospinal fluid, such as hydrocephalus.

“These findings not only help to understand fundamental changes that happen during space flight, but also for people on Earth who suffer from diseases that affect circulation of cerebrospinal fluid,” Piantino said.

Source: IANS

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Weekly Technical Share Market Outlook

Weekly Technical Share Market Outlook

The Indian market recovered sharply on the last trading day amid the weekend after a continuous fall. Market has managed to halt above 16000 Nifty levels after continuous losing streak. Index reacted violently, grasping Indian as well as global factors throughout the week. Simultaneously, Inflation is catching up and profit margins are taking a hit.

 

Sensex advanced 1532 points or 2.90 percent while Nifty gained 484 points or 3.07 percent in a week. Simultaneously, Bank nifty has overcome bear’s dominance ending the session with 3.49 percent gain. Sectorally,Nifty Metal saw the highest gains of 7.40 percent followed by the Realty and Auto added over 4% gain. On the flip side Nifty IT tumbled 2.82 percent on weekly basis. Midcap and Small Cap measures rising nearly 2 percent as well.

In Nifty stock, EICHERMOT gained 11.31% while TECHM lost 5.98% on a weekly basis. INDIA VIX closes at 23.10 suggests volatility driven market is going to remain intact. Coming to the OI Data, on the call side highest OI witnessed at 17000 Nifty followed by 16800 Nifty strike price while on the put side, the highest OI was at 16000 Nifty followed by 15800 Nifty strike price. Technically, Nifty has formed a Tweezer Bottom type pattern in the weekly chart suggesting a short term buying rally may drive the market until monthly expiry. On the daily chart, price has rebounded from the lower Bollinger band as well.

Momentum indicators MACD & Stochastic were trading with a positive crossover & reversed from oversold zone. However, Index is still struggling to get the support of 50 Simple Moving Average in daily chart. Short term investors and traders are advised to work with option strategies to neutralize the volatility. Overall, Nifty is having support at 15700 mark while on the upside 16700 followed by 16500 may act as an immediate resistance. While Bank nifty has support around 32500 while resistance is placed at 36000 on weekly chart.

Sumeet Bagadia
Executive Director
Choice Broking

Source: Choice India

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