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
2'-phosphodiesterase
a cutie pie
abnormal focal length
aggregation of individual preferences
air inlet valve of dredger's deliving pipeline
air-guns
alcala de la selva
archeri
Ariquemes
assinie
Auberger blood group system
Banbayan Pt.
bar rack
be food for worms
between-class correlation
Brachypodium sylvaticum
calex
capon test
carbon steel
catch copy
Central I.
chantha
chromophobic
couchful
day disk
deformational stress
detonation point
deutscheland
drive out of
duramatral
echymose
Elephanta Island
expected yield
fadged
fermentation inhibitor
floating point unit
folded and grooved seam
go hard or go home
half titles
harker lines
hideosities
Higher bid
imperialls
insinuate
iris detachment
Jeans viscosity equation
lactocidin
lbgs
lead metasilicate
left atrium failure
Liberation Tigers of Tamil Eelam
lock cylinder
loi-cadre
M.H.R.
macromitrium ferriei
marie dolores eliza rosanna gilberts
membranogenesis
mesh side cutter
Minskian
nodes
nonitemized
normal congruence
observantially
order parameter
pachometers
papular pruritic gloves and socks syndrome
paroxysmal coliky pain
patent licence-agreement
Phulsāri
pioneering work
plain ashlar
plant ledger card
pork fillet
preconising
PSD (power spectral density)
ragtop
relish
residual valency
Santa Maria, I.
satish
scientific data processing
search and seizure
Seawater Quality Standards
sharpness of focusing
side-by-side
Simonart band
Sleepwell
smazes
spherochromatism
starch slurry
stop-and-direction-indicator-lamps
storage cathode ray tube
sweetkin
tabby-cats
teamkillers
tetracontagons
tip clearance area
Tossåsen
uppermost part
us sea
water ejection tube
you're a star