时间:2018-12-24 作者:英语课 分类:2017年Scientific American(二)月


英语课

 


Head to the mountains, and if the steep trails don't slow you down, the thin air will. There's less oxygen up there—so strenuous 1 activity can leave you dizzy, out of breath…or worse. But even though you're beat, biochemical processes are already busy at work, acclimating 2 your body. 


Scientists investigated those pathways in humans and mice. They found that exposure to low oxygen depletes 3 stores of a red-blood-cell protein called eENT1. That's a good thing. Because now other substances that protect your body against low oxygen are free to rapidly accumulate and help the body adapt. 


But here's the kicker—once the eENT1 protein goes away, it doesn’t come back. Meaning red blood cells kind of 'remember' their altitude exposure. And that means if you hit the mountains again soon enough, you can acclimate 4 faster than you did the first time. The findings are in the journal Nature Communications. [Anren Song et al., Erythrocytes retain hypoxic adenosine response for faster acclimatization upon re-ascent] 


There is one caveat 5. "In humans the red blood cell lifespan is 120 days." Study author Yang Xia, a biochemist with the UT Health Science Center in Houston. "So the longer you stay at sea level before you re-climb to high altitude, then such memory will gradually disappear." So unless you're a frequent mountain climber—there's really no shortcut 6 to acclimatization. Then again, there's no shortcut to the summit, either.


—Christopher Intagliata



1 strenuous
adj.奋发的,使劲的;紧张的;热烈的,狂热的
  • He made strenuous efforts to improve his reading. 他奋发努力提高阅读能力。
  • You may run yourself down in this strenuous week.你可能会在这紧张的一周透支掉自己。
2 acclimating
v.使适应新环境,使服水土服水土,适应( acclimate的现在分词 )
3 depletes
使大大的减少,使空虚( deplete的第三人称单数 ); 耗尽,使枯竭
  • Stress depletes both energy and motivation. 压力不仅消耗体力而且让你丧失动力。
  • Scientists refute a longstanding theory of how HIV slowly depletes the body's capacity to fight infection. 科学家驳倒一个爱滋病毒如何慢慢地耗尽身体容量对抗感染的长时间理论。
4 acclimate
v.使服水土,使习惯于新环境
  • I help them acclimate to living in the U.S.我帮助他们适应在美国的生活。
  • How much time does she need to acclimate?她需要多少时间才能适应?
5 caveat
n.警告; 防止误解的说明
  • I would offer a caveat for those who want to join me in the dual calling.为防止发生误解,我想对那些想要步我后尘的人提出警告。
  • As I have written before,that's quite a caveat.正如我以前所写,那确实是个警告。
6 shortcut
n.近路,捷径
  • He was always looking for a shortcut to fame and fortune.他总是在找成名发财的捷径。
  • If you take the shortcut,it will be two li closer.走抄道去要近2里路。
学英语单词
acrospiromas
analytic operator-valued function
area levelling
atomic oxygen fluence model
axial cut distance
azimuth compiler
bahorok
ballast draft condition
batch calculation
bellowed
causative factors of injury
cepalotribe
cobalt nitrate
commodity in warehouse
companion piece
completion message
concentration tracer
cu fts
despotic monarch
dextropropoxyphene
doubling course
dwarf grey willows
elbow-bone
ewan mcgregor
fakeness
flat-plate pressing machine
foot piece
free open textured sand
friction bezel ring
game-fishing
hecto-coulombs
henders
heterogenous catalysis
hog-nosed snake
hollow cathode aluminum ion laser
horsemeat
hungers
hydrophiling
ill-luck
in boundless enthusiasm
incident neutron energy
Indigosol Green IB
iner
katastates
keep your chin up
lavand
load-carrying winding
low-volume shipper
Macquarie Island
magson
Maskil
mason cities
master distance indicator
MCAIS
measurement pattern
mene, mene, tekel, upharsin
metasilicate
more significant bit
Murray State University
new productive capacity
nonoperating
numerical response
optimum capital stock
pachycholia
paramilitarisms
paratrygonica
pentapyrrolidinium
phobic layer
phrasemakings
pinos
power weight ratio
prolified
rageaholics
ravet
reactive termination
redirector
retrofittable
rookly
rotundatus
rugous
satyr plays
sea-cornet
Seckels
single-tub wagon tipper
special holder
spironolactone(anti-aldosterone)
spitball
standard money unit of account
state of permanent neutrality
statistic bit rate
steel hemp
suck at
suratenses
to service
tweer
underground gasification of coal
urcaryote
variable-duration
water regeneration technique
whip a fault out of sb.
wormly
yellowishness