SCIENCE IN THE NEWS - Acne, Eczema and More: Scratching the
SCIENCE IN THE NEWS - Acne, Eczema and More: Scratching the Surface on the Rough Life of Skin
By Caty Weaver 1
Broadcast: Tuesday, November 29, 2005
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VOICE ONE:
I'm Sarah Long with Bob Doughty 2, and this is the VOA Special English program, SCIENCE IN THE NEWS.
VOICE TWO:
Today, we talk about some disorders 4 of the skin, and ways to treat them.
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VOICE ONE:
Skin. It is the largest organ of the body. The first barrier to the outside. It keeps out many harmful bacteria and other things. Of course, it also keeps in all the things we need inside our bodies.
Skin is the largest organ of the body
The skin helps control body temperature. Glands 6 on the skin release fluid to cool the body when it gets too hot. When a person gets too cold, blood vessels 7 in the skin narrow. This helps to trap heat inside the body.
VOICE TWO:
Yet, like other organs of the body, the skin can have problems. Almost any teenager can tell you the most common disorder 3: acne. Acne is connected to hormones 8 and how they affect the oil glands of the skin.
The skin gets its oil, called sebum, from the sebaceous glands. Each gland 5 connects to a passage of extremely small hairs. The sebum travels through these passages. The oil reaches the surface of the skin through little holes, called pores. Sometimes, the sebum, hair and cells of the pores block these openings. This is how acne starts.
Bacteria can grow in a blocked pore. The bacteria produce chemicals and enzymes 9. White blood cells -- infection fighters -- travel to the area. All this leads to a growth on the skin, a pimple 10. This becomes red, hot and often painful.
VOICE ONE:
Some people think eating chocolate or oily foods causes acne. Others blame dirty skin or nervous tension. Yet researchers tell us none of these cause acne.
So what does? Doctors are not sure. But they have some ideas. For one thing, they know that hormones called androgens play a part. Androgens cause the sebaceous glands to grow and make more oil.
Young people will not be happy about this next fact. Androgens increase when boys and girls enter their teenage years.
VOICE TWO:
There are several treatments for acne. Mild cases are generally treated with medicines for use directly on the skin. These often contain salicylic acid or benzoyl peroxide.
People with more serious acne may be given antibiotics 12 to take by mouth. Or they might use a combination of pills and creams.
One of the drugs used to treat the most severe forms of acne is called isotretinoin. It is normally taken for about five months. Isotretinoin has been shown to cure acne in ninety percent of people who use it.
However, isotretinoin and another acne medicine called Accutane can cause serious problems in some cases. If used during pregnancy 13, for example, they can harm the fetus 14.
VOICE ONE:
Skin experts say there are simple ways to help prevent acne outbreaks. One is to touch your face as little as possible, so as not to add oils or put pressure on the skin.
Another good idea is to avoid the urge to burst pimples 15. This can leave permanent marks on the skin.
Doctors also say to avoid strong soaps, and to be gentle as you wash and dry your skin.
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VOICE TWO:
There are other skin problems far more serious than acne. There are several kinds of skin cancer, for example.Skin cancer is often the result of time spent in the sun. Light and heat from the sun can change the chemicals in the skin. The sun produces ultraviolet radiation that causes the skin to burn and, over time, develop cancer.
The most serious skin cancer is melanoma. It begins in the cells that produce skin color. Melanomas can develop anywhere, but are usually found on the back and the shoulders.
Most melanomas are black or brown. They can look like other kinds of growths. But they are the deadliest form of skin cancer. So it is important to watch for signs that can help identify melanoma. Treating it early can make the difference between life and death.
People should see a doctor immediately if they find a growth of a strange shape, with uneven 16 sides or edges that are not straight. Or a growth of different colors. Or a growth larger than six millimeters.
VOICE ONE:
The usual treatment for melanoma is an operation to remove the growth. The surgery is often followed by drugs to kill any cancer cells that remain. Doctors may also order radiation treatment. Radiation kills cancer cells and shrinks cancerous growths.There are experimental treatments for melanoma, as well. Researchers are working on ways to genetically 18 change white blood cells. The goal is to help the body increase its own efforts to destroy the cancer.
Researchers are also working on a possible melanoma vaccine 19. It would not prevent the disease like traditional vaccines 20. Instead, it would help the body fight the cancer in a way similar to the genetic 17 treatment.
However, the best thing is to reduce the chances that you might ever get melanoma. Doctors tell people to limit the amount of time they spend in sunlight. They also suggest wearing hats and other protective clothes. And, they urge people to use products that help protect the skin from the sun.
VOICE TWO:
Yet there are times when doctors use ultraviolet light to treat some skin problems -- like psoriasis, for example.
Psoriasis creates raised areas of skin that are dry and itchy. They are found most often on the elbows, knees and head. But psoriasis can spread to cover larger areas.
It usually begins before age twenty or after fifty. The newest research shows that psoriasis is most likely a disorder that causes the body's defense 22 system to produce too many skin cells.
There is no cure, but there are treatments that can improve the condition. One involves the use of ultraviolet light in the doctor's office to reduce swelling 23 and slow skin cell production. This is sometimes used in combination with a drug called psoralen.
Psoriasis seems to pass down from parent to child. Scientists are searching for a possible gene 11 linked to this condition.
VOICE ONE:
Another skin disorder is atopic dermatitis, commonly called eczema. It creates areas of skin that itch 21 and become rough like leather.
Eczema is most common in babies. At least half of those cases clear up within a few years. But, in adults, this painful condition generally never goes away completely.
People with eczema often also suffer from allergic 24 conditions like asthma 25 and seasonal 26 hay fever. Like psoriasis, there is no cure for eczema. But there are treatments with steroid drugs and also some newly developed kinds without steroids.
Environmental conditions can also play a part. That is why doctors often advise people with eczema not to use cleaners that contain soap, which can make skin dry. Even water can cause dry skin, which can make eczema worse. So can temperature changes and stress.
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VOICE TWO:
Some skin disorders do not cause any physical pain. But, they can cause emotional pain by how they affect the appearance of the skin.
Vitiligo [vit-i-LIE-go], for example, is the destruction of the pigment 27 cells. This disease causes areas of the skin to lose all color. Even the hairs turn white.
For some people, the white spots of vitiligo appear only in one or two areas. Others find pigment loss on just one side of their bodies. Most people, however, develop many such areas all over their skin.
Around the world, as many as fifty-million people have vitiligo. It affects all races and both sexes.
Doctors do not know the cause. However, as with some other skin disorders, they suspect that the body's immune system is involved.
VOICE ONE:
To treat vitiligo, some patients receive psoralen and ultraviolet light. A number of steroid drugs can also help, especially when started early in the disease.
Doctors may also wish to operate to treat severe cases of vitiligo. However, these are considered experimental treatments.
The newest kind of operation involves the removal of a very small piece of healthy skin from the patient. The skin is placed in a substance that helps it grow more pigment cells. These new cells are then placed in the areas where the patient needs pigment.
Vitiligo can cause extreme changes in a person's appearance. That is why there are mental health professionals and also support groups that can help people who have this disease of the skin.
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VOICE TWO:
SCIENCE IN THE NEWS was written by Caty Weaver. It was produced by Mario Ritter. This is Bob Doughty.
VOICE ONE:
And this is Sarah Long. Join us again next week for more news about science in Special English Program on the Voice of America.
- She was a fast weaver and the cloth was very good.她织布织得很快，而且布的质量很好。
- The eager weaver did not notice my confusion.热心的纺织工人没有注意到我的狼狈相。
- Most of successful men have the characteristics of contumacy and doughty.绝大多数成功人士都有共同的特质：脾气倔强，性格刚强。
- The doughty old man battled his illness with fierce determination.坚强的老人用巨大毅力与疾病作斗争。
- When returning back,he discovered the room to be in disorder.回家后，他发现屋子里乱七八糟。
- It contained a vast number of letters in great disorder.里面七零八落地装着许多信件。
- Reports of anorexia and other eating disorders are on the increase. 据报告，厌食症和其他饮食方面的功能紊乱发生率正在不断增长。 来自《简明英汉词典》
- The announcement led to violent civil disorders. 这项宣布引起剧烈的骚乱。 来自《简明英汉词典》
- This is a snake's poison gland.这就是蛇的毒腺。
- Her mother has an underactive adrenal gland.她的母亲肾上腺机能不全。
- The river is navigable by vessels of up to 90 tons. 90 吨以下的船只可以从这条河通过。 来自《简明英汉词典》
- All modern vessels of any size are fitted with radar installations. 所有现代化船只都有雷达装置。 来自《现代汉英综合大词典》
- It was said that washing powders containing enzymes remove stains more efficiently. 据说加酶洗衣粉除污更有效。
- Among the enzymes which are particularly effective are pepsin, papain. 在酶当中特别有效的是胃朊酶、木瓜酶。
- His face was covered with pimples.他满脸粉刺。
- This is also a way to prevent the pimple.这也是防止疙瘩的一个途径。
- A single gene may have many effects.单一基因可能具有很多种效应。
- The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。
- the discovery of antibiotics in the 20th century 20世纪抗生素的发现
- The doctor gave me a prescription for antibiotics. 医生给我开了抗生素。
- Early pregnancy is often accompanied by nausea.怀孕早期常有恶心的现象。
- Smoking during pregnancy increases the risk of miscarriage.怀孕期吸烟会增加流产的危险。
- In the fetus,blood cells are formed in different sites at different ages.胎儿的血细胞在不同时期生成在不同的部位。
- No one knows why a fetus is not automatically rejected by the mother's immune system. 没有人知道为什么母亲的免疫系统不会自动排斥胎儿。
- It gave me goose pimples just to think about it. 只是想到它我就起鸡皮疙瘩。
- His face has now broken out in pimples. 他脸上突然起了丘疹。 来自《简明英汉词典》
- The sidewalk is very uneven—be careful where you walk.这人行道凹凸不平—走路时请小心。
- The country was noted for its uneven distribution of land resources.这个国家以土地资源分布不均匀出名。
- It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
- Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。
- All the bees in the colony are genetically related. 同一群体的蜜蜂都有亲缘关系。
- Genetically modified foods have already arrived on American dinner tables. 经基因改造加工过的食物已端上了美国人的餐桌。 来自英汉非文学 - 生命科学 - 基因与食物
- The polio vaccine has saved millions of lives.脊髓灰质炎疫苗挽救了数以百万计的生命。
- She takes a vaccine against influenza every fall.她每年秋季接种流感疫苗。
- His team are at the forefront of scientific research into vaccines. 他的小组处于疫苗科研的最前沿。
- The vaccines were kept cool in refrigerators. 疫苗放在冰箱中冷藏。
- The accused has the right to defense.被告人有权获得辩护。
- The war has impacted the area with military and defense workers.战争使那个地区挤满了军队和防御工程人员。
- Use ice to reduce the swelling. 用冰敷消肿。
- There is a marked swelling of the lymph nodes. 淋巴结处有明显的肿块。
- Alice is allergic to the fur of cats.艾丽斯对猫的皮毛过敏。
- Many people are allergic to airborne pollutants such as pollen.许多人对空气传播的污染物过敏，比如花粉。
- I think he's having an asthma attack.我想他现在是哮喘病发作了。
- Its presence in allergic asthma is well known.它在过敏性气喘中的存在是大家很熟悉的。
- The town relies on the seasonal tourist industry for jobs.这个城镇依靠季节性旅游业提供就业机会。
- The hors d'oeuvre is seasonal vegetables.餐前小吃是应时蔬菜。