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牙菌斑生物膜 dental plaque biofilm
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考题
The sound of "th" in "thin" is__________.
A.voiceless, dental, and fricative
B.voiced, dental, and fricative
C.voiceless, dental, and affricative
D.voiced, dental, and affricative
考题
单选题A study by a group of dentists has concluded that regular use of a certain brand of mouthwash is as effective as flossing in preventing gum disease. The mouthwash company has released a television ad suggesting that people who do not like flossing can now rely solely on mouthwash and brushing to maintain good dental health. A leading manufacturer of dental floss brought a lawsuit against the mouthwash company demanding that the advertisement be discontinued on the grounds that it is misleading. Which of the following, if true, provides the strongest support for the dental floss company’s claim that the advertisement is misleading?A
The dental floss manufacturer is concerned that it will lose market share in the dental health market because the advertisement encourages people to switch from dental floss to mouthwash.B
The dental floss company claims in its own advertisements that brushing and flossing after every meal is the most effective way to maintain good dental health.C
Although mouthwash is an effective deterrent to gum disease, it is less effective than dental floss at removing plaque and preventing cavities between teeth.D
Per usage, mouthwash is three times more expensive than dental floss, if the recommended amounts of both products are used.E
The dentists who conducted the study on the effectiveness of mouthwash in preventing gum disease obtained their funding for the study from a company that manufactures mouthwash.
考题
单选题对牙菌斑的描述哪项准确？（ ）A
非附着菌斑不属于牙菌斑B
牙菌斑结构中没有中间层C
牙菌斑形成不需要经过获得膜形成阶段D
牙菌斑是一种微生物膜E
只有黏附到牙齿表面的才是牙菌斑
考题
单选题牙菌斑是一个典型的生物膜，是微生物赖以生存的基础。牙菌斑生物膜的结构特征具有保护细菌的作用。菌斑生物膜能够有效保护细菌，防止细菌被氧化损伤，其作用机制是通过（）A
膜内高水平的巯基B
黏附素C
大量的黏蛋白和糖蛋白D
高密度的菌群E
膜内多聚体基质形成的网络结构
考题
单选题牙菌斑是一个典型的生物膜，是微生物赖以生存的基础。牙菌斑生物膜的结构特征具有保护细菌的作用。菌斑生物膜能够防止细菌出现“酸休克”，其作用机制主要是通过（）A
膜内多聚体基质形成的网络结构B
膜结构的完整性C
高度密集的菌群D
节制细菌的代谢E
拮抗抗生素的作用
考题
问答题Dental Health Decay is not the only disease that can cause tooth loss. Another serious disease affects the gums, the tissue that surrounds the teeth. It is also caused by bacteria. If the bacteria are not removed every day, they form a substance that stays on the teeth. The substance is known as plaque. At first, the gums appear to be swollen, and may bleed when the teeth are brushed. This can lead to serious infection of the tissue around the teeth. The infection may damage the bone that supports the teeth and cause tooth loss and other health problems. Studies have found that people with severe gum disease have an increased risk of developing heart disease, diabetes and stroke. Gum disease can be treated by a special dentist called a periodontist. Periodontists are trained to repair the gum areas that have been damaged. This can be painful and costly. Dental health experts say the best thing to do is to stop gum disease before it starts. The way to do this is to clean the teeth every day. People also should use dental floss to remove plaque from between the teeth. Most experts also agree that another way to prevent tooth and gum problems is to eat foods high in calcium and vitamins and low in sugar. Scientists continue to develop better dental treatments and equipment. Improved technology may change the way people receive dental treatment in the future. For example, dentists are now suing laser light to treat diseased gums and teeth. Dentists use computer technology to help them repair damaged teeth. Researchers have developed improved methods to repair bone that supports the teeth. And genetic research is expected to develop tests that will show the presence of disease causing bacteria in the mouth. Such increased knowledge about dental diseases and ways to prevent them has improved the health of many people. Yet problems remain in some areas. In industrial countries, minorities and other groups have a high level of untreated dental disease. In developing countries, many areas do not have even emergency care services. The World Health Organization says people in countries in Africa have the most tooth and gum problems. World Health Organization experts say the dental health situation is different for almost every country in the world. As a result, it has developed oral health programs separately for each area. The WHO oral health program is mainly for people living in poor areas. It provides them with information about mouth diseases and health care. It also studies preventive programs using fluoride in water, salt, mild and toothpaste. And it explores ways to include dental health in national health care systems. Many governments and other organizations provide help, so people can get needed dental health services. But dental health professionals say people should take good care of their teeth and gums. They say people should keep their teeth as clean as possible. They should eat foods high in calcium and fiber. These include milk products, whole grain breads and cereals, vegetables, fruits, beans and nuts. Recent studies have shown that eating nuts can help slow the production of plaque on the teeth. Experts say these activities will help everyone improve their dental health throughout their lives.
考题
填空题牙菌斑生物膜的形成过程（）；细菌黏附和共聚；菌斑生物膜成熟。
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