科学家分析出血玛丽鸡尾酒的配方.doc

科学家分析出血玛丽鸡尾酒的配方更新日期：2011-03-31 09:52 浏览: 435次所属分类：2011年03月科学美国人提示:双击单词，即可查看词义！坐在家里上美国大学-订购课程DVD MP3下载 文本下载 返回列表 听力原文 Bloody Mary Gives Up Its Flavor Secrets2011 is the International Year of Chemistry. So scientists at the national meeting of the American Chemical Society in Anaheim raised a glass. (Or a beaker.) And they celebrated as only chemists canby carefully analyzing its contents. Neil Da Costa, Flavor chemistry of the Bloody Mary cocktailThe drink they dissected was the Bloody Mary, perhaps the worlds most chemically complex cocktail. A mix of tomato juice and vodka, along with lemon or lime, horseradish, Tabasco and Worcestershire sauces, black pepper and celery salt, the Bloody Mary packs a punch. And it lights up nearly our entire range of taste receptors, giving us sweet, salty, sour and savory.To find out the Bloody Marys secret, researchers shared one with a chromatograph, which identified the various compounds that contribute to the drinks flavor and bouquet. The scientists turned up plenty of antioxidants, as well as a few bartending tips.First, make it fresh. The acids in tomato juice can degrade the drinks other ingredients. Also, make it coldice slows the degradation. Use the best tomato juicethe major source of flavor. But feel free to cheap out on the vodka. Its taste gets lost in the complex mix. In other words, chemists say to save the Grey Goose for other experiments.Karen Hopkin废旧机油转化成汽油更新日期：2011-03-30 10:27 浏览: 458次所属分类：2011年03月科学美国人提示:双击单词，即可查看词义！坐在家里上美国大学-订购课程DVD MP3下载 文本下载 返回列表 听力原文 Chemists Turn Used Motor Oil Into GasTo keep your car purring, you have to change the oil. Such maintenance produces eight billion gallons of used motor oil annually. Some waste oil does get re-refined to produce oil for lubrication or heating. And some just gets dumped. So it would be more environmentally friendly and provide fresh fuel if we could convert the old motor oil to something really valuable: new gasoline. And thats what a research team thinks theyve done. They presented their work at the annual meeting of the American Chemical Society. Su Shiung Lam, Alan Russell and Howard Chase, From waste to valuable fuel: How microwave-heated pyrolysis can recycle waste automotive engine oilTheir approach involves pyrolysis, decomposing organic material with heat in the absence of oxygen. Pyrolysis can break down waste oil into gases, liquids, a little bit of solids. The gases and liquids can be converted into gas or diesel. But conventional pyrolysis methods dont do a great job with motor oil.The new technique mixes the oil with a material really good at absorbing microwave radiation. Tests showed that heating this mixture with microwaves was about 90 percent efficient at creating precursors to fuelwhich beats tossing the oil down the drain.Steve MirskyVOA常速英语:零售商琢磨如何满足二战后婴儿潮一代的需求更新日期：2011-06-02 09:14 所属分类：2011年06月VOA常速英语提示:双击单词，即可查看词义！坐在家里上美国大学-订购课程DVD MP3下载 文本下载 返回列表 Retailers Prepare for Aging Baby BoomersThe first group of so-called baby boomers, Americans born after World War II, turns 65 this year. Within the next 10 years, the number of Americans over 65 is expected to jump almost 30 percent. That has U.S. retailers pondering how to accommodate the millions of older shoppers wholl be flooding through their doors in the coming decades.Photo: Courtesy CVSCVS stores offer magnifiers for customers who might have trouble reading the small print on labels.What appeals to many shoppers - fully-stocked shelves with enticing displays, numerous aisles and gleaming floors - can have a different impact as we age. Take the floors, for example.Retailers love shiny floors, says retail anthropologist Georganne Bender. But shiny floors are scary to somebody whos not sure if its going to be, you know, slick footing for them.Then theres getting down those long aisles to the products, which may be on shelves that are too high or too low. Half the population over 65 has some kind of arthritis. A lot of younger people have it too. Reaching and bending get harder.Making changesThe National Retail Federation says its members are working to make shopping easier. Bender notes changes at one drugstore chain.Theyre re-setting their counters, not putting things too high or too low, theyre putting carpeting in the store.There also are magnifiers hanging from shelves so shoppers can read the fine print on packaging. But so far, Bender says, theres more talk than action from most retailers. New Yorkers Robert and Ronnie Rubin are retired teachers in their late sixties who run into problems while shopping, starting with the lack of automatic doors at many stores. You need to be, uh, Hercules to open the door, says Robert Rubin.Ronnie Rubin adds, Robert and I have more than once gone over to assist someone in opening the door because they just couldnt get it open. Were fortunate were still healthy enough to be able to do these things.Age-friendly shoppingBut there may come a time when the Rubins will benefit from a store designed with their needs in mind. Rosemary Bakker of Weill Cornell Medical College is an interior designer and gerontologist. She assesses a grocery store on Manhattans Upper West Side that the New York City council has called age-friendly. Bakker notices something age-unfriendly as soon as she walks in: the upbeat music blaring from the stores public address system.This music is geared for a much younger audience, and I find it with this very low beat, very distracting, she says. So I want to come in here and shop but theres this drum beat going on and I feel like Im in the wrong environment.Anyone with cognitive difficulties would find the visual stimuli of the displays, combined with the music, too much to handle, according to Bakker. A 79-year-old woman across the street confirms she avoids the market for that very reason. But on other fronts, this store does well. It has wide aisles, good lighting and helpful staff. The signs are easy to read. Bakker turns to the utensils at the salad bar.They have nice size handles here for me to pick up, so Im looking to make sure that I can easily grasp things