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Bacteria are extremely small living things. While we measure our own sizes in inches or centimeters, bacterial size is measured in microns. One micron is a thousandth of a millimeter: a pinhead is about a millimeter across. Rod-shaped bacteria are u

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- 04 - assume vt.假装；假定，设想；承担；呈现，采取 assumption n.假定，设想；采取；承担；推测；假装 assurance n.保证,担保；确信,断言；信心,信念 assure vt.使确信，使放心(of)；向保证 astonish vt.使惊讶，使吃惊 astronaut n.太空人，太空旅行者 astronomy n

VOA标准英语2015--Rock-Consuming Organisms Alter Views of Life Processes

Rock-Consuming Organisms Alter Views of Life Processes LOS ANGELES Kenneth Nealson can be described in many ways, including expert in microbiology and biochemistry. But that's not the one he is most proud of. People call me the 'father of Shewanella,

VOA慢速英语2009年-Agriculture Report - With Resistant Crops,

This is the VOA Special English Agriculture Report. Plant breeders and genetic engineers keep working to give crops the strength to resist threats like insects, diseases, droughts or floods. But before you can resist a threat, you need to understand

VOA标准英语2015--Study: Rats Pose Plague Risk in Croplands

Study: Rats Pose Plague Risk in Croplands Efforts to boost food production in East Africa may increase the risk of plague. A new study says the conversion of natural lands into croplands in Tanzania has been accompanied by a large increase in the rod

英语听力文摘 English Digest 608、大自然中的DNA交易

Wouldnt it be great if we could trade genes with other species? For example, suppose you could trade the family cat your genes for intelligence for its genes for physical coordination! Well, okay, thats not likely to happen anytime soon. But DNA trad

2007年VOA标准英语-Rising Numbers of TB Victims, Emergence of Drug

By Scott Bobb Johannesburg 19 March 2007 Tuberculosis until a few years ago was off the informal list of priority diseases because it could be prevented and it could be cured. Now, as the world marks Tuberculosis Day, the disease is causing alarm be

2006年VOA标准英语-FDA Warning Consumers to Avoid Fresh Spinach

By Mil Arcega Washington, DC 19 September 2006 watch report on E Coli The United States Food and Drug Administration (F.D.A.) has expanded its search for the source of the deadly E.Coli bacterium that has already killed one woman and sickened more t

VOA标准英语2011--Human Waste Killing Caribbean Coral

Human Waste Killing Caribbean Coral In the first documented case of a human pathogen infecting a marine species, U.S. scientists say a bacterium in untreated human sewage is killing coral along the Florida coast and in the Caribbean Sea. The finding

2006年VOA标准英语-Drug Resistant TB Is More Widespread Than Previ

By Jessica Berman Washington 24 December 2006 A new study by the World Health Organization has found drug-resistant tuberculosis in virtually all of the 79 countries the organization surveyed around the world, with particularly high levels in countr

2007年VOA标准英语-Tuberculosis Remains a Global Threat

By David McAlary Washington 30 May 2007 U.S. health officials have quarantined an airline passenger who may have exposed others to a potentially dangerous form of tuberculosis. The unusual decision was made after the passenger took flights from the U

VOA标准英语2012--New TB Drug Regimen Launched in Africa, South America

New TB Drug Regimen Launched in Africa, South America With nearly 4000 people dying of tuberculosis each day around the world, public health officials say TB control efforts urgently need new drugs. The clinical trials being launched by the TB Allian

VOA标准英语2010年-Frog Skin Oozes Possibly Powerful Anti

Frogs secrete compounds that could be used to battle MRSA and a new emerging bacterium that affects many wounded soldiers in Iraq. According to Mideast researchers, the amphibians could provide several new antibiotic compounds to fight drug resistant

科学美国人60秒 SSS 2014-03-06

During the physical examine, doctors pick up blood from thepatients including that patient's bacteria. To keep infection from spreading,physicians try to always wash their hands between examines. But they don'talways scrub their stethoscopes. To see

科学美国人60秒 SSS Bacteria Can Be Resistant to Brand-New Antibiotics

Bacteria Can Be Resistant to Brand-New Antibiotics 谁在对抗最新的抗生素 Perhaps the chief poster child of antibiotic resistance is methicillin-resistant Staphylococcus aureus, or MRSA. The bacterium is impervious to a suite of antibiotics,

英语听力：自然百科 已知的宇宙：外星生命 Alien_Contact-4

Water allows the sand grains to flow to gather and intermingle and form more complex structures. In the same way, water acts like a cocktail mixer, allowing the atoms and molecules to come together, and also may form the building blocks of life. All

2006年VOA标准英语-New Research Suggests Infections May Run in Fam

By Jessica Berman Washington 04 October 2006 New research suggests that infectious diseases may run in families. Investigators say the discovery represents a major shift in the way scientists view human disease. Experts have always accepted that cer

2006年VOA标准英语-Cholera Drug Tested Successfully, but Pand

By David McAlary Washington 07 June 2006 Children collect water in Luanda, Angola Researchers in Bangladesh have tested a drug that cures cholera in most patients, showing that it is a useful new weap

英语听力文摘 English Digest 428、泥土的芬芳

The Smell of Dirt A lot of people love that fresh-dirt smell. The surprising thing, though, is that it isnt coming from the dirt itself. Microbiologist s have traced the pleasant odor to an organic chemical called geosmin. No way! But how does geosmi