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咖啡中含有抑制口臭的物質

以色列科学家最新研究发现，咖啡中含有抑制口臭的物質，将来或可用于漱口水、口气清新剂和口香糖中。

以色列特拉維夫大學口氣專家羅森貝格教授說：“每個人都認爲咖啡導致口氣不佳，因爲當咖啡與牛奶混合後，致使口腔內部脫水，發酵産生發臭物質。”但他在實驗中意外發現，咖啡反而可能抑制口臭。

羅森貝格和同事分別選用兩種以色列産咖啡和一種“雀巢”速溶咖啡，放入裝有唾液的玻璃試管中，希望證明咖啡與唾液混合後，産生散發臭味的氣體。結果出人意料，他們發現，咖啡能阻止這種氣體的産生，一些實驗中氣體産生最多可減少90%。

口腔內部舌頭、牙槽等部位是牙菌斑的“樂園”，這種細菌能制造揮發性的硫磺化合物，令口腔散發出臭味。如果食用洋蔥、大蒜等味道重的食物，口臭會持續較長時間，因爲血液會吸收這些食物成分，然後進入肺部，再呼出體外。漱口水和口香糖只能短暫遮蓋而無法消除臭味，只有等這些食物排出體外以後，臭味才會消失。

罗森贝格计划把咖啡中这种神奇物质分离出来。他说：“我们将使用的不是原始的提取物，而是其中的活性物质。” 这种咖啡提取物能抑制牙菌斑形成，从源头上阻断口臭的发生。它或将取代只能掩盖口气的薄荷，成为新一代漱口水、口气清新剂、口香糖的基础成分

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"We walked by the side of our teams or behind the wagons, we slept on the ground at night, we did our own cooking, we washed our knives by sticking them into the ground rapidly a few times, and we washed our plates with sand and wisps of grass. When we stopped, we arranged our wagons in a circle, and thus formed a 'corral,' or yard, where we drove our oxen to yoke them up. And the corral was often very useful as a fort, or camp, for defending ourselves against the Indians. Do you see that little hollow down there?" he asked, pointing to a depression in the ground a short distance to the right of the train. "Well, in that hollow our wagon-train was kept three days and nights by the Indians. Three days and nights they stayed around, and made several attacks. Two of our men were killed and three were wounded by their arrows, and others had narrow escapes. One arrow hit me on the throat, but I was saved by the knot of my neckerchief, and the point only tore the skin a little. Since that time I have always had a fondness for large neckties. I don't know how many of the Indians we killed, as they carried off their dead and wounded, to save them from being scalped. Next to getting the scalps of their enemies, the most important thing with the Indians is to save their own. We had several fights during our journey, but that one was the worst. Once a little party of us were surrounded in a small 'wallow,' and had a tough time to defend ourselves successfully. Luckily for us, the Indians had no fire-arms then, and their bows and arrows were no match for our rifles. Nowadays they are well armed, but there are[Pg 41] not so many of them, and they are not inclined to trouble the railway trains. They used to do a great deal of mischief in the old times, and many a poor fellow has been killed by them." The boys looked in the direction indicated, but could see nothing. This is not surprising, when we remember that sailors' eyes are accustomed to great distances, and can frequently see objects distinctly long before landsmen can make them out. Mr. Charlton's melancholy eyes seemed to be fixed on space. Just for the moment he had forgotten that he was not alone. Lawrence gave a sympathetic cough. As a matter of fact, he had not yet explained what he was doing there, and the longer the explanation was postponed the better he would be pleased. "You see our patient has gone," Balmayne said smoothly. "As a matter of fact, the whole thing was a ridiculous mistake. But you must not blame us. The blame is due to the charming young lady who sent for you. But that is one of the drawbacks of your noble profession. Goodnight." In one of the inmost circles, a sacred elephant had gone must, breaking his ropes, and confined now by only one leg. The chains fastened round his feet as soon as he showed the first symptoms of madness were lying broken in heaps on the ground. The brute had demolished the walls of his stable and then two sheds that happened to be in his way; now he was stamping a dance, every muscle in incessant motion, half swallowing his trunk, flinging straw in every direction, and finally heaping it on his head. A mob of people stood gazing from a distance, laughing at his heavy, clumsy movements; at the least step forward they[Pg 113] huddled back to fly, extending the circle, but still staring at the patient. In an adjoining stable were two more elephants very well cared for, the V neatly painted in red and white on their trunks, quietly eating and turning round only at the bidding of the driver; but one of them shed tears. The rajah's sleeping-room has at one end a dais ascended by three steps; here the sovereign's bed used to be spread; and here, now, the judges of the Supreme Court have their seats. In the middle of the room was a confused array of benches and tables, and against the walls, also washed with yellow, hung a series of portraits of bewigged worthies. No new clues offered themselves. He detached one of the hard, adhering chunks of gum and dropped it into his pocket, “just in case,” he said, half-grinning, “just in case they transfer themselves somewhere else. I’ll leave twenty-nine of them—and see.” The Lieutenant and Si and Shorty tried to make themselves believe that the noise was receding, showing that the rebels were being driven. At times it certainly was so, and then again it would burst out, Naturally, the boys were big-eyed all the time with the sights that filled the landscape near and far. Wherever they looked they were astonished, and when in a march they came out on a crest that commanded a wide view, they could not help halting, to drink all its wonders in. Even the experienced Si and Shorty were as full of amazement as they, and watched with fascination the spectacle of mighty preparation and concentrated power. "It has a great deal to do with this lecture with which you have favored us," answered the Major dryly. "But we'll not discuss that in open court. Are you through with the witness, Judge-Advocate? If so, call the next." "But I'm not going to leave you alone to brood," Albin said. "Because I'm your friend. And brooding isn't good for you. It's brooding that's got you into such a state—where you worry about growing things, for God's sake, and about freedom and silly things like that." Albin grinned. "What you've got to do is stop worrying, and I know how to get you to do that, kiddo. I really do." "Where may I learn the others?" But Gornom didn't answer, and Cadnan's breathing-space was over. He had to be back at the board, pushing buttons, watching carefully. Gornom stood behind him, peering over his shoulder with a cloudy eye. 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