Edward Willett

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Food coatings

Most people prefer shiny apples to dull ones, crisp French fries to soggy ones, and fresh nuts to stale ones. Enter food coatings. Some are visible and some are invisible, but they're on much of the food you buy, keeping it fresh-tasting and -looking longer. It's not easy. After all, the coating has to be edible and either taste good or taste like nothing at all. Depending on the food it's applied to, it may be called upon to prevent oxidation, limit moisture and oil transfer and stabilize the food during freezing and thawing. It also has to be able to be applied, stick and stay stuck to all kinds ...

Posted by Edward Willett at 22:35, April 17th, 2001 under Blog, Columns, Science Columns | Comment now »

Teflon

The first time I saw a Teflon-covered pan, when I was four or five, I thought it was magic. Now that I cook, I'm even more impressed by non-stick surfaces. Teflon was discovered by accident by Roy J. Plunkett, 27, a DuPont scientist who was trying to develop a new chlorofluorocarbon (CFC) for use as a refrigerant by reacting a gas called tetrafluoroethylene (TFE) with hydrochloric acid. He'd prepared 100 pounds of TFE in pressure cylinders, which, for safety reasons, he stored in dry ice. On the morning of April 6, 1938, Plunkett's assistant, Jack Rebok, opened the valve of a canister of TFE--and nothing came out. They weighed the cylinder. The gas was still inside, ...

Posted by Edward Willett at 3:47, January 30th, 2001 under Blog, Columns, Science Columns | Comment now »

Christmas chemistry

The Physics of Christmas is a very good book by Roger Highland. But there's more science to Christmas than just physics; there's chemistry, too. Consider those popular Christmas spices, ginger and cinnamon. Ginger has been used for thousands of years. Greek bakers were making gingerbread more than four thousand years ago (though probably not in the shape of little men). Ginger's name comes from a Sanskrit word meaning horn-shaped (probably referring to the shape of the root), but its distinctive flavor comes from chemistry, from aromatic compounds called--what else?--gingerols. Cinnamon also derives its flavor from a chemical compound, cinnamic aldehyde. True cinnamon, the bark ...

Posted by Edward Willett at 16:22, December 19th, 2000 under Blog, Columns, Science Columns | Comment now »

The chemistry of love

Men have always suspected it, but now there's scientific evidence: chocolate makes females more interested in sex. OK, so maybe that's oversimplifying. What the study announced just before Valentine's Day (appropriately enough) really said was that a "messenger protein" called DARPP-32 makes female rodents more interested in sex. But even the study's lead author, Dr. Shaila Mani, a molecular biologist with Baylor College of Medicine in Houston, Texas, made the connection. Dr. Mani said that sensory cues such as soft lights, wine and, yes, chocolate, stimulate the brain's production of dopamine. Dopamine, in turn, activates DARPP-32, which gears up the interest in sex. Dr. Mani studied female mice and rats, who don't have sex just ...

Posted by Edward Willett at 5:52, February 15th, 2000 under Blog, Columns, Science Columns | Comment now »

Platinum

Residents of Cardiff, Wales, were bemused (and probably amused) not to long ago to see a respected geologist out on the streets of town early one Sunday morning, sweeping road dust into a dustpan. Fortunately, Dr. Hazel Prichard hadn't been forced to take up stree-sweeping because she had lost her job at Cardiff University; instead, she was testing a theory that the streets of Cardiff--and most other major Western cities--are slowly becoming paved with platinum. Dr. Prichard told a conference in Cardiff last week that the amount of platinum spewed out on city streets from the catalytic convertors used to control pollution is approaching the point where it might be economical to recycle it. Platinum, which ...

Posted by Edward Willett at 20:44, September 14th, 1998 under Blog, Columns, Science Columns | Comment now »

Sunscreens

  Considering our winters, it's not surprising we love the summer sun. Unfortunately, too much sun isn't good for us: the thinning ozone layer is letting in more ultraviolet radiation than it used to, and as a result, skin cancer is on the increase. That unhappy fact has made sunscreens, concoctions that keep ultraviolet radiation from reaching the skin, all the rage. Just one problem: although they prevent sunburns, we don't know for sure if they prevent skin cancer. Ultraviolet radiation, which make up 15 percent of the solar energy that reaches Earth's surface, packs enough energy to damage our skin's DNA. Our skin tries to fight this by tanning: producing more of the dark pigment melanin. There are two kinds of ...

Posted by Edward Willett at 23:08, June 15th, 1998 under Blog, Columns, Science Columns | Comment now »

Skunks

  There are lots of good things to smell in the summertime: flowers, steaks on the barbecue, fresh-cut grass. But there are also other, less fortunate smells: hot wet dog, five-day-old roadkill--and skunk. My personal experience of the smell of skunk has been limited to a whiff of that inimitable scent wafted on the breeze, for which I am grateful. But many a pet owner has had a much more up-close-and-personal encounter with the smell, and this year has been worse than usual, because the skunk population is booming. That's because there's also a huge population of mice and voles this year and, although most people don't realize it, skunks are predators who feed on mice and voles. (Also grasshoppers, ...

Posted by Edward Willett at 14:18, October 11th, 1997 under Blog, Columns, Science Columns | Comment now »

Food coloring

Today is the day when all across our land, people gather to celebrate food coloring. In kitchens, in restaurants, in bars, they partake of special holiday foods, each given "a touch of the green"--green beer, green milkshakes, green pasta. It's a touching and important reminder of the importance of color additives to our diet. What's that? It's St. Patrick's Day, not the annual Food Coloring Festival? Oh. Well, whatever day it is, it's still a good one to talk about food coloring, since so much of it will be used, albeit it mostly the same color. Actually, any day would be a good day to talk about food coloring, but ...

Posted by Edward Willett at 22:37, March 17th, 1997 under Blog, Columns, Science Columns | Comment now »

Garlic

There are few foods that can't be improved with a little garlic. (Ice cream and pecan pie, maybe, but that's about it.) Its distinctive taste has made it a favorite flavoring for thousands of years...although no doubt the ancient Egyptians and Romans, both of whom used it, also made the first jokes about "garlic breath." Nowadays, there are even better reasons than flavor to eat garlic. Garlic (Allium sativum) is related to the onion (big surprise). It produces bulbs covered with a papery skin. Each bulb can be broken into smaller bulblets, called "cloves." It's these cloves that are used for flavoring, either whole or crushed or turned into a ...

Posted by Edward Willett at 11:49, January 27th, 1997 under Blog, Columns, Science Columns | Comment now »

Winemaking

The process of making wine begins, of course, with growing grapes and extracting their juice.  But then what happens? I'm here to elucidate (which is not a word you want to try saying after you've drunk a little too much wine, by the way). Once the juice is in the vat, it’s left to ferment. Traditionally this fermentation was brought about by natural yeasts present on the grape skins, but today cultured yeasts are often added. Yeast feeds on the sugar in the juice and converts it to alcohol. If the wine is left fermenting long enough, the yeast will eventually convert all the sugar into alcohol. The result is a "dry"--non-sweet--wine. However, fermentation can also ...

Posted by Edward Willett at 16:26, July 1st, 1996 under Blog, Columns, Science Columns | Comment now »