时间:2019-01-08 作者:英语课 分类:Scientific American(四)月


英语课

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute.


Landfills produce methane 1—which can be valuable as an energy source. But scientists haven't known why landfills make so much methane. The solid waste in landfills is typically at a pH that's considered too acidic to host methanogens, methane-producing microbes.


So scientists did some digging, literally 2, to investigate. They found a particularly hearty 3 methanogen called Methanosarcina barkeri, or just M. barkeri, that can survive at low pH levels.


M. barkeri eats the acids and produces some methane. At the same time, it raises the pH level in the area around it. The less-acidic environment that results becomes a better host for other methanogens. As liquid leaches 4 through the landfill, it carries higher pH materials and the methanogens living among them to other areas of the landfill.


M. barkeri repeats this cycle, making the landfill environment even more methanogen-friendly. The research was published in the journal Applied 5 and Environmental Microbiology.


M. barkeri not only produces methane that could be harvested for fuel—the microbes also make the whole trash mound 6 more compact. The finding could help in the development of ways to accelerate the process. Leading to more methane collection and more room for waste without more landfills.


Thanks for the minute. For Scientific American's 60-Second Science, I'm Cynthia Graber.



n.甲烷,沼气
  • The blast was caused by pockets of methane gas that ignited.爆炸是由数袋甲烷气体着火引起的。
  • Methane may have extraterrestrial significance.甲烷具有星际意义。
adv.照字面意义,逐字地;确实
  • He translated the passage literally.他逐字逐句地翻译这段文字。
  • Sometimes she would not sit down till she was literally faint.有时候,她不走到真正要昏厥了,决不肯坐下来。
adj.热情友好的;衷心的;尽情的,纵情的
  • After work they made a hearty meal in the worker's canteen.工作完了,他们在工人食堂饱餐了一顿。
  • We accorded him a hearty welcome.我们给他热忱的欢迎。
n.(将化学品、矿物质等)过滤( leach的名词复数 );(液体)过滤,滤去
  • People consume it when it leaches from plastic into baby formula, water or food in container. 当它被从塑料中经沥滤而入婴儿配方奶粉、水或罐装食品当中的时候,人们将其摄入。 来自互联网
  • After this article uses is also the microwave pretreatment, leaches the method with the solution. 本文采用的也是微波预处理后用溶液浸取的方法。 来自互联网
adj.应用的;v.应用,适用
  • She plans to take a course in applied linguistics.她打算学习应用语言学课程。
  • This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
n.土墩,堤,小山;v.筑堤,用土堆防卫
  • The explorers climbed a mound to survey the land around them.勘探者爬上土丘去勘测周围的土地。
  • The mound can be used as our screen.这个土丘可做我们的掩蔽物。
标签: SSS 托福素材
学英语单词
a.e
airtronic
alpha ray component
arrestins
Atlantic Ocean Islands
bank rate of discount
bench jockey
Boehmeria formosana
BORDETELLOSES
bounded region
Caith.
Cape Codders
Ceratostigma willmottianum
Chelyadinove
coal mining
coinsuring
combustion chamber casing
companywide
complementized
concelebrates
continental dispersion
cummed
cyclotropin
dawgie
diphenyl antimony cyanide
dispersing oil
dollar convertibility into gold
Eberhard effect
egcs
electrically heated drying oven
Elmendorf Air Force Base
etymemazine
eyelet wire
faculas
femoral ring
fifth day
fish-bellied beam
fissura interhemisphacrica
floatable
foundation of wall
fruit-flies
genicoms
genus chelidoniums
give oneself trouble
handing profits over to the state
hate-boners
historical bibliography
hydraulic operation
hypersynergia
i still remember
imminences
intense fall
irisated
Laportea interrupta
Lappian
lienas
light boat
low-frequency limit
major error
mcgrain
mcmichaels
mean hemispherical candle power
medium frequency electrodiagnosis
mentition
mission-minded
Montenero di Bisaccia
nickless
nodalization
non-institutional shares
offware
pimple dick
predator-preys
pressurises
Prokop'yevsk
puritanic
re-cross
ridgeland
rotary fluid pressure machine
Ruska
schiebold-sauter photograph
screen banks
Sedum tsinghaicum
self determination
self-division
Shaivism
single states
soldierliness
stand density
summer haw
TBO life
tearing machine
tenison
thatchboard
the little edge of the wedge
timeplex
transmission matrix
U-cell(undefined)lymphoma
variable-gain cell
Vorgod
warmongering
woodlief
yak meat