病原菌

Organisms evolved sexual reproduction so they could stay one step ahead of parasites. Or so the theory goes. But what about beasties that make babies without sex? How do they escape infection? A study in the journal Science suggests that for bdelloid

发表于:2018-12-02 / 阅读(164) / 评论(0) 分类 Scientific American(一)月

One common protein-contact prediction is that, if the side chain of one member of a pair of amino acids brought close together by folding is long, 一种比较普通的蛋白质接触预测就是,如果一对氨基酸的一个侧链折叠后很长,

发表于:2018-12-05 / 阅读(153) / 评论(0) 分类 经济学人科技系列

> 58 菌类植物产生于几十亿年前 DATE=8/24/01 TITLE=ENVIRONMENT REPORT - Early Plant Study BYLINE=Cynthia Kirk (Start at 1’00” )This is Bill White with the VOA Special English ENVIRONM

发表于:2019-01-02 / 阅读(176) / 评论(0) 分类 自然探索

Supporting National Parks Through the Arts Artist Rosalie Haizlett starts every day by opening a map of the Great Smokey Mountains National Park. Over breakfast, she plans her walk for the day. She packs food and a sketch book, and then leaves for he

发表于:2019-01-03 / 阅读(152) / 评论(0) 分类 2018年VOA慢速英语(七)月

This is scientific Americans 60 second science,I'm Cynthia Graber.This will just take a minute.A coal mine can decrease the local environment but a Fungi may indivertantly help cleanup the mine with its own waste products. Researchers worked with the

发表于:2019-01-08 / 阅读(182) / 评论(0) 分类 Scientific American(七)月

1. Efforts to reach six Utah coal miners trapped more than 1500 feet underground will take at least three days. That's according to one of the mine's owners who says rescuers aren't sure the men survived the cave-in. There has been no word from them

发表于:2019-01-08 / 阅读(176) / 评论(0) 分类 美联社新闻一分钟2007

This is the VOA Special English Agriculture Report. Farmers know that if you reduce harmful insects and diseases in your crops, you have a chance for a better harvest. Today, many farmers and experts praise Integrated Pest Management, or IPM. IPM is

发表于:2019-01-12 / 阅读(157) / 评论(0) 分类 2010年VOA慢速英语(十一)月

AS IT IS 2016-09-15 What is Pneumonia and How Do You Get it? 什么是肺炎?怎么预防? This week, presidential candidate Hillary Clinton made news -- not for what she said, but for her health. 这一周,总统候选人希拉里克林顿(H

发表于:2019-01-12 / 阅读(122) / 评论(0) 分类 2016年VOA慢速英语(九)月

University of Maryland scientists are working on a genetically-engineered fungus that would kill the malaria parasite. The battle against malaria continues to challenge doctors, scientists, and public health officials. Now, a team of British and Amer

发表于:2019-01-14 / 阅读(152) / 评论(0) 分类 VOA标准英语2011年(三月)

Science and technology 科学技术 Bioremediation 生物降解 Bottom feeders 清道夫平菇 A novel way of dealing with an unpleasant problem 解决烦人难题的新颖方法 For your delight and delectation 愿你欢愉 DESPITE their name, dispo

发表于:2019-01-16 / 阅读(151) / 评论(0) 分类 经济学人科技系列

《回到未来2》上映于1989年,片中主角从1985年穿越到了2015,演绎了对2015年的一系列怪异预测。 Although several of the film's predictions, like video calls and wearable technology, came true, Back to the Future II showe

发表于:2019-02-13 / 阅读(137) / 评论(0) 分类 阅读空间

11.Acids are chemical compounds that,in water solution,have a sharp taste, a corrosive action on metals,and the ability to turn certain blue vegetable dyes red. 12.Billie Holiday's reputation as a great jazz-blues singer rests on her ability to giv

发表于:2019-02-13 / 阅读(135) / 评论(0) 分类 托福英语

Insects Donate DNA to Unrelated Bugs 昆虫捐献DNA给无关的虫类 You can thank your parents for your DNA. Because humans share genes through sexual reproduction, passing DNA from parent to child. It's known as the 'vertical transfer' of DNA. No

发表于:2019-02-13 / 阅读(147) / 评论(0) 分类 2018年科学美国人2月

For most of that time of life on Earth, living organisms have been relatively simple -- single cells. 地球的大多数时间,生物体多是以简单的单细胞存在的。 But they had great diversity, and, inside, great complexity. 但是它们是

发表于:2019-02-14 / 阅读(120) / 评论(0) 分类 TED演讲教育篇

In 1969, in an attempt to bring some order to the growing inadequacies of classification, 1969年,为了整理一下越来越显得不足的分类法, an ecologist from Cornell University named R. H. Whittaker unveiled in the journal Science a pr

发表于:2019-02-17 / 阅读(220) / 评论(0) 分类 万物简史

When times are good, they exist as one-celled individuals, much like amoebas. 当年景好的时候,它们以单细胞的形式独立存在,很像是变形虫; But when conditions grow tough, they crawl to a central gathering place and become,

发表于:2019-02-17 / 阅读(116) / 评论(0) 分类 万物简史

在我们的生活中,死亡是我们所有人必定会遇到的事情,无论是家庭成员还是宠物,甚至是你都将有终结之时。事实上,每分钟世界上大约就有100人死亡。但在人死之时到底会发生什么呢?

发表于:2019-02-17 / 阅读(197) / 评论(0) 分类 阅读空间

11. Acids are chemical compounds that, in water solution, have a sharp taste, a corrosive action on metals, and the ability to turn certain blue vegetable dyes red. 11. 酸是一种化合物,它在溶

发表于:2019-02-18 / 阅读(132) / 评论(0) 分类 实用英语

1. 在并列连词(and, but, for, nor, or, yet )前使用,用来连接句中的各分句。 The principal reason for this is that none of them possesses chlorophyll, andsince they cannot synthesize their own carbohydrates, they obtain their supplie

发表于:2019-02-19 / 阅读(145) / 评论(0) 分类 托福英语

Well, mushrooms are merely one of many types of fungi. Not all fungi grow in soil. However, mushrooms and other fungi do resemble plants in many ways, so much so that scientists long classified fungi plants, but they know better now. Eating Habits Wh

发表于:2019-02-24 / 阅读(129) / 评论(0) 分类 英语听力文摘 English Digest
学英语单词
a day behind the fair
agals
air bottle pressure chamber
alphanumeric listeral
alternating-current plate resistance
analytical function
applied business statistics
arc of recess
auger-type grain elevator
Balkan Romani
bell type autoclave press
bisztyga
Box and Jenkins model
brachiocephalic arteritis
calepitrimerus undatus
Changchongsan
Cooper Hugh Lincoln
cortical area
Cramer's butter
dart leader
dassell
dead-end station
dibutyryl cyclic adenosine monophosphate
direct write-off method for uncollectibles
Dogo Argentino
dorsal nasal vein
dose equivalent commitment
El Arâich
emergency red aspect
engineering advisor
equivalet conductance
erysimum arkansanums
ethanedithioamide
first reduction pinion
front draft lug
glycerylphosphatide
hereto
hipdom
hydro-forming
ice bags
indirect-cooled desuperheater
infin.
inner counter
kelkal
Koskaecodde L.
ladenness
lattice framing
leadout
lemish
Leptodermis oblonga
lig. carpi transversum
linear amplification
Metepec
micrometer caliper gage
myohemoglobin
narbo
night defense
numerosas
nursing officer
odoration
optical delay
panthon
paper misfeed rate
phenoxaphosphine
photolettering
poophilus
practical men
prohibite
Provideniya, Bukhta
pseudo-off line working
reabjustment
recreator
right of transit passage
sail-fish
scuzzier
seismic reflection profiling
shaft gear
ship traffic simulation
Siambisso
special columnar journal sheet
spings
spinomuscular tract
spore membrane
spreing
standard testing sieve
standards for university libraries
stroke volume
sub-mucosa
susis
sword stick
tail roller
tankbusting
tetu
the base of the standard
the fucking you get isn't worth the fucking you get
thyrotoxins
true height of the barometer
twelve-year compulsory education
unilaterally connected graph
university training department
visual pairing
Waldachtal