蚊子的作文,Mosquito

2018-07-19 14:01:28来源:作文小巨人作者:小巨人

英语作文蚊子

蚊子

蚊子的主要危害是蚊媒疾病。据研究,蚊虫传播疾病有80多种。在地球上,没有昆虫比蚊子对人类更有害。世界上有2000多种蚊子,中国约有140种。可以传播疾病的蚊子可以分为三类:一类叫做按蚊,俗称按蚊蚊子,主要传播疟疾。另一种叫做蚊虫,主要传播丝虫病和日本脑炎。第三类被称为伊蚊(Aedes)蚊子,其具有黑色和白色条纹,也被称为黑色斑点蚊子。它主要传播流行性乙型脑炎和登革热。消灭蚊子是预防疾病减少的有效方法。每个人都开始清理蚊子如河流和垃圾容易生长的地方。现代科学技术在40°C也有电蚊香,表现为头痛,恶心,呕吐,精神疲劳和嗜睡。如果不及时治疗,孩子很快会出现持续性惊厥,颈项强直,呼吸衰竭等症状。该病的高死亡率是威胁儿童生命和健康的严重疾病之一。救助后幸存的儿童往往会有不同程度的后遗症,如失语,瘫痪和痴呆等蚊子的益处。 1.蚊子越咬人,免疫力越强据“新科学家”杂志日前报道,先前被昆虫咬伤的人可能不会被寄生虫携带的昆虫感染的病毒所困扰。

由于人体皮肤暴露于咬人昆虫的唾液中,因此它对病毒具有一定的免疫力。如果可以提取昆虫唾液的成分,未来疟疾和其他致命疾病疫苗的发展将会取得更大的突破。 2.蚊子对唾液的神奇作用以前记载了利什曼病的情况,尤其是黑热病。利什曼病是一种传染病。它由鞭毛虫原生动物利什曼原虫引起,并通过吸血雪貂传播给人体或动物体。在伊拉克战争期间,这种皮肤病已经感染了驻扎在伊拉克的许多美国军队。现在,研究人员对小鼠的临床研究表明,蚊子的唾液可以抵抗疟疾感染。 3.刺激蚊子唾液免疫圣母大学的免疫寄生虫专家Mary Ann McDowell说,一些地区的人每天都遭到数千蚊子的蹂躏。

他们暴露在太多的蚊子唾液中。科学家对昆虫的临床研究表明,先前被沙蝇咬伤的人可以抵抗利什曼病的传播。因此,McDowell决定进一步研究疟疾传播是否具有相同的特性。作为国立卫生研究院(NIH)的一部分的国家过敏和传染病研究所接管了这项研究。该小组将老鼠放在携带疟疾蚊子的环境中,其中一些蚊子已经被蚊子咬伤,而蚊子并未携带??疟疾。

经过一段时间后,临床结果显示,被蚊虫咬伤的这些小鼠肝脏和血液中只含有少量寄生虫。因为蚊子叮咬小鼠的唾液可刺激小鼠的免疫系统产生免疫信号化学物质细胞因子。被蚊子咬伤的好处是什么?虽然有好处,但我们不能对蚊子采取较轻的措施,或者我们必须尽量防止蚊子咬人。

毕竟,这是四大弊端之一,缺点远远不止于此。特别是,孩子的家长应采取有效措施,防止蚊子盯着后婴儿红肿。如果他们被咬伤,他们绝不能让宝宝受到感染。

Mosquito

The main harm of mosquitoes is mosquito-borne diseases. According to research, there are more than 80 kinds of mosquito-borne diseases. On earth, no insect is more harmful to humans than mosquitoes. There are more than 2,000 species of mosquitoes in the world and about 140 species in China. Mosquitoes that can transmit diseases can be divided into three categories: A class called Anopheles, commonly known as Anopheles mosquitoes, which mainly transmit malaria. The other is called Culex mosquito, which mainly spreads filariasis and Japanese encephalitis. The third category is called Aedes mosquito, which has black and white stripes, also known as black spotted mosquitoes. It mainly spreads epidemic encephalitis B and dengue fever. Elimination of mosquitoes is an effective way to prevent disease reduction. Everyone starts to clean up places where mosquitoes such as rivers and garbage can easily grow. Modern science and technology also has electric mosquito coils at 40°C, manifested as headache, nausea, vomiting, mental fatigue and lethargy. Without timely treatment, children will soon experience persistent convulsions, stiff neck, respiratory failure and other symptoms. The high mortality rate of the disease is one of the serious diseases that threaten the life and health of children. The children who survived the rescue also often have different degrees of sequelae, such as the benefits of mosquitoes such as aphasia, paralysis, and dementia. 1. Mosquitoes The more biting bites, the stronger the immunity According to "New Scientist" magazine recently reported that people who had previously been bitten by insects may not be plagued by infectious viruses carried by parasites in insects.

Because the human skin is exposed to the saliva of biting insects, it can have a certain immunity to the virus. If the components of insect saliva can be extracted, the future development of vaccines for malaria and other deadly diseases will make even greater breakthroughs. 2. The miraculous effect of mosquitoes on saliva The case of leishmaniasis, especially kala-azar, has been previously documented. Leishmaniasis is an infectious disease. It is caused by a flagellate protozoan Leishmania and transmitted to the human or animal body through blood-sucking ferrets. During the Iraq war, this skin disease had infected many U.S. troops stationed in Iraq. Now a clinical study of mice by researchers has shown that mosquitoes' saliva can resist malaria infection. 3. Mosquito saliva stimulating immunity Immune parasite expert Mary Ann McDowell from the University of Notre Dame said that people in some areas are ravaged by thousands of mosquitoes every day.

They are exposed to too much mosquito saliva. Scientists' clinical studies on insects have shown that people who were previously bitten by sand flies can resist the spread of leishmaniasis. Therefore, McDowell decided to conduct further research on whether malaria transmission has the same properties. The National Institute of Allergy and Infectious Diseases, which is part of the National Institutes of Health (NIH), took over the study. The team placed the mice in an environment that carried malaria mosquitoes, some of which had been bitten by mosquitoes that did not carry malaria.

After a period of time, clinical results showed that these mice bitten by mosquitoes contained only a small amount of parasites in the liver and blood. Because the saliva that mosquitoes bite in mice can stimulate the mouse's immune system to produce immune signaling chemicals cytokines. Is the benefits of being bitten by mosquitoes surprising? Although there are benefits, we must not take lighter measures against mosquitoes, or we must try to prevent mosquitoes from biting.

After all, it is one of the four evils, and the disadvantage is far more than good. In particular, parents of children should take effective measures to prevent the baby from getting red and swollen after the mosquitoes are staring. If they are bitten, they must not let the baby be infected.