Live Bliksemontladingen

De teller in het icoon met het onweersbuitje geeft live het actuele aantal bliksemontladingen uit onze regio weer. De dekking ligt in een vierkant om Nederland en België, waardoor er ook data van rondom Parijs, op de Noordzee en uit een deel van Duitsland wordt weergegeven.

Ontladingen

De ontladingen kun je terugvinden op de Google Maps kaart onderaan de pagina. Deze worden nog niet live bijgewerkt, voor de meest actuele ontladingen ververs je de pagina. De iconen op de kaart lopen in kleur van Geel naar Rood, waarbij Geel een 'nieuwe' ontlading is en Rood een 'oude'.

Geluid

De teller maakt geluid als het aantal bliksemontladingen verhoogt. Dus, bij een update van 0 naar 1 hoor je geluid. Je kunt dit uitschakelen met het luidspreker icoontje in de balk hierboven.

Data © Blitzortung.org / Lightningmaps.org
nl
StormTrack Beta
Welkom op onweer-online.nl! Als je je nog niet hebt geregistreerd, meld je dan nu aan op de leukste en grootste weercommunity van Nederland. Heb je al een account, log dan hier in.
Joyce.s
Moderator
Woonplaats: Helmond
Berichten: 2048
Lid sinds: 13 jan. 2015
3 november, 14:30 uur | Bericht #482983

Here's What Long-Term Living in Space Does to Astronaut Brains


SQUISH.MIKE MCRAE
3 NOV 2017

As if astronauts didn't have enough to worry about, a new study has confirmed one more possible health problem intrepid spacefarers face as they reach for the stars – tissue expansion at the top of the brain.

It's not clear yet what the consequences of this swelling might be, and if there are any adverse health effects at all. But it's hard to imagine 'brain squeeze' is something potential Martian pioneers would be looking forward to.
The NASA-funded research was conducted on 34 astronauts who participated in short- and long-term missions to the International Space Station (ISS) or short trips on the space shuttle.

Each subject had their brain scanned with functional magnetic resonance imaging (fMRI) technology shortly before and after their mission, with the scans sent to neuroradiologists for interpreting.

None of the interpreters knew who the scans belonged to, and had no idea if the astronaut had been in space for as little as a week or two, or a number of months.

Sure enough, staying in space for long periods appears to increase your chances of developing some serious-sounding abnormalities.

Of the 18 ISS astronauts who were classified as long-term space residents, 17 showed signs of a narrowing of the brain's central sulcus; a cleft that runs across the middle of the brain. This was seen in just three of the short-term travellers.

The sulcus divides areas of the brain responsible for motor control from those looking after sensory input.
An overall upward shift of the brain into the very top of the skull was seen in 12 of the long-duration astronauts, but in none of the short-term group.

Similarly, a shrinking of the cerebrospinal fluid channels at the top of the skull was seen in 12 of the long term group and just one of the short term.

While it all may sound alarming, it's actually hard to know what this narrowing means - whether it impedes the flow of cerebrospinal fluid or puts pressure on surrounding tissues.

"We don't know if these changes will continue to worsen with mission duration or if they may eventually reach a plateau," researcher Donna Roberts from the Medical University of South Carolina told CNN's Ashley Strickland.

More research is clearly needed, and future missions can provide that data. But the predictions aren't comforting.

"We hypothesise that upward brain shift and expansion of tissue along the top of the brain may in result in compression of adjacent venous structures along the top of the head," says Roberts.
"While we cannot prove it yet, we suspect that this may ultimately result in a decrease in the outflow of (cerebrospinal fluid) and blood from the head."

It's no surprise that microgravity would change how organs like the brain change shape, affecting the movement of fluids.

Time spent in free-fall produces a wide variety of changes on our biology, often affecting male and female anatomy in unique ways.

If you're familiar with astronaut lingo, you might have heard of the term "puffy head bird legs" to describe the condition of fluid hanging about in the upper body, making legs seem scrawny as the face swells.

Staying in space for half a year or more can alter the shape of our eyes, for instance, impairing our vision.

Oddly, not a lot of study has been done on the central nervous system.

Several years ago a similar piece of research also showed some significant changes to the volumes of various parts of the brain.

There is also evidence that the increased amounts of radiation showering down on astronauts can increase their risks of developing Alzheimer's disease.

Could the long trip to Mars hit them with a double whammy, building up damaging proteins that aren't efficiently whisked away thanks to narrow channels?

Space is hell on the human body, but then so were long ocean voyages just a few centuries ago.

It's clearly still early days for spacefaring humans, but understanding the problem is the first step in solving it. 

This research was published in The New England Journal of Medicine.
Bron: http://www.sciencealert.com/brain-structures-change-size-long-term-space-travel-2017
Terug naar boven
1 Gebruiker leest nu dit topic, onderverdeeld in 1 gast en 0 leden
Berichten
Er zijn in totaal 25.154 topics, welke bij elkaar 434.289 reacties hebben gekregen.
Leden
We zijn met 10.485 leden.
Het nieuwste lid is MariavE.

Berichten
Je moet inloggen om je berichten te kunnen lezen.
Dit topic
1 mensen bekijken nu dit topic.

Record
Op 6 december 2010 om 11.29 uur waren er 2.792 mensen tegelijkertijd online op onweer-online!
Stats
Er zijn nu 229 mensen aan het browsen op het forum. 2 Daarvan zijn ingelogd.
Van die 229, lezen 9 mensen het topic "Zomer discussietopic 2015".

Sponsors en partners

Actueel op OnweerOnline.nl

Medicane Ionische Zee

Wintersfeer topic

Zware overstromingen in Attica, Griekenland

Aardbeving Iran/Irak

Meer dan 300 doden

© 2003 - 2017 onweer-online.nl   |   Alle rechten voorbehouden   |   Algemene gebruiksvoorwaarden