㈠ 新型冠狀病毒的英語作文怎麼寫
As
for
me,
I
should
also
actively
contribute
my
own
strength
to
this
year's
new
year's
Eve,
do
not
visit
the
door,
do
not
have
a
dinner
party,
and
urge
my
family
to
do
a
good
job
in
health
and
epidemic
prevention.
I
have
to
go
to
public
places
and
wear
masks
in
a
standardized
way.
The
used
masks
are
thrown
into
the
"hazardous
waste"
bin
according
to
the
regulations.
Pay
attention
to
personal
hygiene,
often
ventilate,
wash
hands
frequently,
do
not
spit
everywhere,
and
make
correct
shelter
when
sneezing
and
coughing.
Study
at
home,
strengthen
exercise
and
protect
wild
animals.
The
bell
of
2020
has
been
ringing,
and
the
spring
is
not
far
away.
I
believe
that
with
the
joint
efforts
of
the
people
of
the
whole
country,
we
can
win
this
"battle"
and
usher
in
a
better
2020
in
my
heart!
翻譯:
每年春節到來的時候,家家戶戶都張燈結綵,貼上了美麗的窗花,各種各樣的大「福」字和春聯,到處都是喜氣洋洋的。
然而2020年的春節卻完全不一樣,一場不見硝煙,不聞炮響的戰爭打響了,不宣而戰,「新型管狀病毒「肺炎席捲而至,各地各部門積極響應,共同對抗疫情。白衣天使們,武警官兵們,志願者們……。許許多多奮戰在一線的勇士們,他們作為生命的逆行者,開啟了2020的新篇章。
至於我,也應該積極奉獻自己的一份力量,做到今年過年,不串門,不聚餐,督促家人做好衛生防疫,不得已去公共場所必須規范戴好口罩,使用過的口罩按規定丟入「有害垃圾「桶。注重個人衛生,常通風,勤洗手,不隨地吐痰,打噴嚏咳嗽時應做出正確遮擋。在家開展學習,加強鍛煉,保護野生動物。
2020年的鍾聲已經敲響,萬紫千紅的春天已經不遠了,我想信在全國人民的共同努力下,我們一定能打贏這場「戰役」,迎來我心中美好的2020!
㈡ 請你閱讀材料並回答問題:材料一:傳染性非典型肺炎是由冠狀病毒的一個變種(即SARS病毒)引起的.其傳播
傳染病是指由病原體引起的,能在人與人之間、人與動物之間互相傳染的一種疾病,傳染病一般有傳染源、傳播途徑和易感人群這三個基本環節,其中傳染源是指能夠散播病原體的人或動物,如流感患者等;傳播途徑是指病原體離開傳播源到達健康人所經過的途徑,如病人的排泄物,分泌物和傳播疾病的生物或非生物媒介等;易感人群是指對某些傳染病缺乏免疫力而容易感染該病的人群,如老人和小孩等.所以傳染病缺少了任何一個環節,就流行不起來. (1)某人未得傳染病之前屬於易感人群,患病以後則屬於傳染源 (2)預防傳染病的措施有控制傳染源、切斷傳播途徑、保護易感人群.傳染源指的是能夠散播病原體的人或是動物;傳播途徑指的是病原體離開傳染源到達健康人所經過的途徑;保護易感人群指的是對某種傳染病缺乏免疫力而容易感染該病的人群.所以講究個人衛生和環境衛生,這在傳染病預防措施中屬於切斷傳播途徑.積極參加體育鍛煉屬於保護易感人群. (3)當病原體進入人體後會刺激淋巴細胞產生一種抵抗該病原體的蛋白質,叫做抗體,「非典」患者的體內已經產生了抵抗SARS病毒的抗體,因此注射痊癒後「非典」患者的血清能夠治療「非典」. (4)病原體侵入人體後,會刺激淋巴細胞產生抵抗該病原體的特殊的蛋白質----抗體,引起人體產生抗體的物質叫抗原.某種抗體只與刺激它產生的那種抗原結合,促進吞噬細胞吞噬病原體,或使病原體失去致病性.有的抗原被清除後,相應的抗體仍留在人體內,當同樣的抗原再次侵入人體時,就會很快被體內存留的抗體按照同樣的方式加以清除,從而起到預防傳染病的作用,所以SARS屬於抗原.注射「非典」疫苗會刺激人體免疫細胞產生一種抵抗該病原體的特殊蛋白質,叫做抗體,抗體能夠協助吞噬細胞來消滅特定的病原體SARS病毒,這種免疫類型只對特定病原體起作用,對其它病原體無效,因此屬於特異性免疫. 故答案為:(1)易感人群;傳染源 (2)切斷傳播途徑;保護易感人群. (3)抗體(4)抗原;注射;特異性免疫 |
㈢ 冠狀病毒英語怎麼寫
冠狀病毒英語為coronavirus。
coronavirus
讀法:[kə,rəunə'vaiərəs]
釋義:n. 冠狀病毒;日冕形病毒
短語
1、SARS coronavirusSARS冠狀病毒 ; sars病毒 ; 冠狀病毒
2、Equine coronavirus馬冠狀病毒
3、novel coronavirus新型冠狀病毒 ; 冠狀病毒
4、coronavirus pneumonia冠狀病毒肺炎
5、coronavirus igg冠狀病毒
6、Canine coronavirus犬冠狀病毒
7、coronavirus antibody冠狀病毒抗體
8、Coronavirus infection冠狀病毒感染
9、Rat coronavirus大鼠冠狀病毒
例句
Theyfound thatfourof themasked palmcivets- whichhaveshortfur andblack and whitestripeson theirfaces-were carryingacoronavirusthat causedSars.
他們發現其中四隻毛發較短、面部有黑白條紋的果子狸攜帶了一種能導致非典的冠狀病毒。
㈣ 新型冠狀病毒英語作文有嗎
As
for
me,
I
should
also
actively
contribute
my
own
strength
to
this
year's
new
year's
Eve,
do
not
visit
the
door,
do
not
have
a
dinner
party,
and
urge
my
family
to
do
a
good
job
in
health
and
epidemic
prevention.
I
have
to
go
to
public
places
and
wear
masks
in
a
standardized
way.
The
used
masks
are
thrown
into
the
"hazardous
waste"
bin
according
to
the
regulations.
Pay
attention
to
personal
hygiene,
often
ventilate,
wash
hands
frequently,
do
not
spit
everywhere,
and
make
correct
shelter
when
sneezing
and
coughing.
Study
at
home,
strengthen
exercise
and
protect
wild
animals.
The
bell
of
2020
has
been
ringing,
and
the
spring
is
not
far
away.
I
believe
that
with
the
joint
efforts
of
the
people
of
the
whole
country,
we
can
win
this
"battle"
and
usher
in
a
better
2020
in
my
heart!
翻譯:
每年春節到來的時候,家家戶戶都張燈結綵,貼上了美麗的窗花,各種各樣的大「福」字和春聯,到處都是喜氣洋洋的。
然而2020年的春節卻完全不一樣,一場不見硝煙,不聞炮響的戰爭打響了,不宣而戰,「新型管狀病毒「肺炎席捲而至,各地各部門積極響應,共同對抗疫情。白衣天使們,武警官兵們,志願者們……。許許多多奮戰在一線的勇士們,他們作為生命的逆行者,開啟了2020的新篇章。
至於我,也應該積極奉獻自己的一份力量,做到今年過年,不串門,不聚餐,督促家人做好衛生防疫,不得已去公共場所必須規范戴好口罩,使用過的口罩按規定丟入「有害垃圾「桶。注重個人衛生,常通風,勤洗手,不隨地吐痰,打噴嚏咳嗽時應做出正確遮擋。在家開展學習,加強鍛煉,保護野生動物。
2020年的鍾聲已經敲響,萬紫千紅的春天已經不遠了,我想信在全國人民的共同努力下,我們一定能打贏這場「戰役「,迎來我心中美好的2020!
㈤ 關於冠狀病毒的作文怎樣寫
尊敬的白衣天使:
你們好!
今年這個春節,是一個太特別的春節。因為疫情發展的太過迅速,你們放下了回家的行囊,停下了回家的腳步,義無反顧地選擇堅守在抗疫的第一戰線上。在這個闔家歡樂的日子裡,我們在享受靜好歲月,而你們卻在負重前行,用愛守護著我們。
曾幾何時,網路上稱消防員是「最美逆行者」,當無情的大火肆虐,眾人紛紛逃離時,他們卻向著火光前行,只留下偉岸的背影。其實而在這場突如其來的疫情面前,你們又何嘗不是「最美逆行者」。
在大家對病毒避之唯恐不及的時候,是你們遞上了一張張「請戰書」身先士卒奔赴在抗治疫情的最前線,哪一個人不是逆流而上,你們才是這個時代最可愛的人!
在這場沒有硝煙的戰爭時期,我每天都有關注官方推送的關於疫情的消息,也因為這樣我才「結識」了你們。
當我得知,17年前領軍戰非典的84歲的鍾南山院士、以郭軍主任為領隊的清華大學附屬北京清華長庚醫院醫護人員和全國各地醫療隊義無反顧的馳援武漢,加入抗擊疫情行列時,腦海中浮現著「攜手無懼,為愛逆行」的字樣;
當我看到一張張充滿印痕、紅腫的臉和一個個寫在後背的名字時,我難以掩飾內心深處的悲痛以及敬意。你們也是爸爸、媽媽、兒子、女兒,你們的家人也在等你們回家團聚,
但你們依舊選擇不顧個人安危,始終奮戰在防治疫情第一線「舍小家,為大家」,我為你們點贊,更應該向你們學習。
在全國人民「眾志成城,抗擊疫情」之時,我不是像陳琳琳一樣馳援武漢的醫療隊員,不是像韓紅基金會一樣的後方援助手,而是一名2020年參加高考的考生也是一名剛剛成年的孩子。在這個特殊的時期,我也有責任、義務貢獻自己微弱的力量。
首先,我和家人也會停下出行的腳步,不為你們添堵添亂。其次,我也會在家合理安排學習和生活,積極的備戰高考。最後,我相信只要我們一起努力,疫情就一定會被擊垮,我們就一定會取得勝利。
請你們保護好自己的同時抗擊疫情,此時的全國人民都已點亮自己心中的光,前方再暗的路都會被照亮。也請你們相信,前路無懼讓我們攜手並進用愛去溫暖更多的人。
祖國定會像戰勝03年非典和H7N9禽流感一樣戰勝這次的冠狀病毒,我們等著你們的捷報傳來!
㈥ 關於新型冠狀病毒的作文怎麼寫
2020年的春節,在所有中國人的心裡,註定是一個永生難忘的記憶。新型冠狀病毒的肆虐,讓辭舊迎新的鍾聲更加沉重,人們臉上的那一個個口罩,讓這個春節倍感冷清。
這個冬天,梅花依然寧靜地開放;這個冬天,藍天依舊明凈如洗;這個冬天的武漢卻非常艱難,全國人民卻非常艱難。在這特殊的日子裡,我們謹遵醫囑,靜靜地待在家中。我們為武漢憂心忡忡,我們為治癒病例的增多而感到高興,為武漢的人們牽腸掛肚。
與此同時,有一群人,他們正沖在前方,用自己的平凡之軀為身後的億萬中國人築起防護的堡壘,他們舍小家為大家,不眠不休,戰斗在這場沒有硝煙的戰場上的最前沿。他們是來自全國各地的最美逆行者,他們是新時代的最美先鋒人物,他們是可親可敬的白衣天使。
在這群人當中,有一位84歲的老院士,叫鍾南山,17年前,這位老院士奮斗在抗非的最前線上,為抗擊非典立下了汗馬功勞。17年後的今天他臨危受命,搭上前往武漢的高鐵,再次前往抗擊疫情的前線;86歲的董宗祁老教授,他坐在輪椅上,一上午看了30多個病人,他說:「我這輩子,就是為了救人」;73歲的李蘭娟教授,知道國家有難,她毫不猶豫前往武漢,堅定地說出她的誓言:「我打算長期待在武漢,與那邊的醫護人員一起奮斗!」
這世上哪有什麼歲月靜好,只是因為有人在替我們負重前行罷了,這世上哪有什麼天生的英雄,只有因為人們需要,才有人願意犧牲自己成為英雄。
雖然我不知道他們是誰,但我明白他們是為了誰。他們也許並不富裕,甚至有些貧窮;他們也許並不高大,甚至有些瘦弱;他們也許並不光鮮,甚至有點卑微,他們的形象在我心中是那樣模糊,但他們的精神在我心中卻是那樣鮮明;不計生死,不求回報,默默堅守的他們,守護著健康,保衛著生命。
普通的我們無法到達正面戰場與病毒作戰,我們只能做好我們的後勤工作,不出門,少出門,勤洗手,戴口罩,這是為了不給他們添麻煩,祝願他們平安早日凱旋。
彩虹為證,千古不變,我要高歌。為生命喜悅,萬物都歌頌你的慈愛,大地訴說你的恩情。
致敬白衣天使!
致敬最美逆行者!
致敬抗擊疫情的每一個人!
㈦ 誰能幫我找一篇與微生物有關的英文文章``````
http://en.wikipedia.org/wiki/Microorganism
http://zh.wikipedia.org/wiki/%E5%BE%AE%E7%94%9F%E7%89%A9
A microorganism (also can be spelled as micro organism) or microbe is an organism that is microscopic (too small to be seen by the naked human eye). The study of microorganisms is called microbiology, a subject that began with Anton van Leeuwenhoek's discovery of microorganisms in 1675, using a microscope of his own design.
Microorganisms are incredibly diverse and include bacteria, fungi, archaea, and protists, as well as some microscopic plants and animals such as plankton, and popularly-known animals such as the planarian and the amoeba. They do not include viruses and prions, which are generally classified as non-living. Most microorganisms are single-celled, or unicellular, but some multicellular organisms are microscopic, while some unicellular protists, and a bacteria called Thiomargarita namibiensis are visible to the naked eye.
Microorganisms live in all parts of the biosphere where there is liquid water, including hot springs, on the ocean floor, high in the atmosphere and deep inside rocks within the Earth's crust. Microorganisms are critical to nutrient recycling in ecosystems as they act as decomposers. As some microorganisms can fix nitrogen, they are a vital part of the nitrogen cycle, and recent studies indicate that airborne microbes may play a role in precipitation and weather.
Microbes are also exploited by people in biotechnology, both in traditional food and beverage preparation, as well as modern technologies based on genetic engineering. However, pathogenic microbes are harmful, since they invade and grow within other organisms, causing diseases that kill millions of people, other animals, and plants.
History
Evolution
Single-celled microorganisms were the first forms of life to develop on earth, approximately 3–4 billion years ago.Further evolution was slow,and for about 3 billion years in the Precambrian eon, all organisms were microscopic. So, for most of the history of life on Earth the only form of life were microorganisms.Bacteria, algae and fungi have been identified in amber that is 220 million years old, which shows that the morphology of microorganisms has changed little since the triassic period.
Most microorganisms can reproce rapidly and microbes such as bacteria can also freely exchange genes by conjugation, transformation and transction between widely-divergent species.[10] This horizontal gene transfer, coupled with a high mutation rate and many other means of genetic variation, allows microorganisms to swiftly evolve (via natural selection) to survive in new environments and respond to environmental stresses. This rapid evolution is important in medicine, as it has led to the recent development of 'super-bugs' — pathogenic bacteria that are resistant to modern antibiotics.
Pre-Microbiology
The possibility that microorganisms might exist was discussed for many centuries before their actual discovery in the 17th century. The first ideas about microorganisms were those of the Roman scholar Marcus Terentius Varro in a book titled On Agriculture in which he warns against locating a homestead near swamps:
「 …and because there are bred certain minute creatures which cannot be seen by the eyes, which float in the air and enter the body through the mouth and nose and there cause serious diseases.」
This passage seems to indicate that the ancients were aware of the possibility that diseases could be spread by yet unseen organisms.
In The Canon of Medicine (1020), Abū Alī ibn Sīnā (Avicenna) stated that bodily secretion is contaminated by foul foreign earthly bodies before being infected.He also hypothesized that tuberculosis and other diseases might be contagious, i.e. that they were infectious diseases, and used quarantine to limit their spread.
When the Black Death bubonic plague reached al-Andalus in the 14th century, Ibn Khatima wrote that infectious diseases were caused by "contagious entities" that enter the human body. Later, in 1546, Girolamo Fracastoro proposed that epidemic diseases were caused by transferable seedlike entities that could transmit infection by direct or indirect contact, or even without contact over long distances.
All these early claims about the existence of microorganisms were speculative in nature and not based on any data or science. Microorganisms were neither proven, observed, nor correctly and accurately described until the 17th century. The reason for this was that all these early inquiries lacked the most fundamental tool in order for microbiology and bacteriology to exist as a science, and that was the microscope.
Discovery
Anton van Leeuwenhoek was the first person to observe microorganisms, using a microscope of his own design, thereby making him the first microbiologist. In doing so Leeuwenhoek would make one of the most important contributions to biology and open up the fields of microbiology and bacteriology. Prior to Leeuwenhoek's discovery of microorganisms in 1675, it had been a mystery as to why grapes could be turned into wine, milk into cheese, or why food would spoil. Leeuwenhoek did not make the connection between these processes and microorganisms, but using a microscope, he did establish that there were forms of life that were not visible to the naked eye.Leeuwenhoek's discovery, along with subsequent observations by Lazzaro Spallanzani and Louis Pasteur, ended the long-held belief that life spontaneously appeared from non-living substances ring the process of spoilage.
Lazzarro Spallanzani found that microorganisms could only settle in a broth if the broth was exposed to the air. He also found that boiling the broth would sterilise it and kill the microorganisms. Louis Pasteur expanded upon Spallanzani's findings by exposing boiled broths to the air, in vessels that contained a filter to prevent all particles from passing through to the growth medium, and also in vessels with no filter at all, with air being admitted via a curved tube that would not allow st particles to come in contact with the broth. By boiling the broth beforehand, Pasteur ensured that no microorganisms survived within the broths at the beginning of his experiment. Nothing grew in the broths in the course of Pasteur's experiment. This meant that the living organisms that grew in such broths came from outside, as spores on st, rather than spontaneously generated within the broth. Thus, Pasteur dealt the death blow to the theory of spontaneous generation and supported germ theory.
In 1876, Robert Koch established that microbes can cause disease. He did this by finding that the blood of cattle who were infected with anthrax always had large numbers of Bacillus anthracis. Koch also found that he could transmit anthrax from one animal to another by taking a small sample of blood from the infected animal and injecting it into a healthy one, causing the healthy animal to become sick. He also found that he could grow the bacteria in a nutrient broth, inject it into a healthy animal, and cause illness. Based upon these experiments, he devised criteria for establishing a causal link between a microbe and a disease in what are now known as Koch's postulates.Though these postulates cannot be applied in all cases, they do retain historical importance in the development of scientific thought and can still be used today.
Classification and structure
Microorganisms can be found almost anywhere in the taxonomic organization of life on the planet. Bacteria and archaea are almost always microscopic, while a number of eukaryotes are also microscopic, including most protists, some fungi, as well as some animals and plants. Viruses are generally regarded as not living and therefore are not microbes, although the field of microbiology also encompasses the study of viruses.
[edit] Prokaryotes
Prokaryotes are organisms that lack a cell nucleus and the other organelles found in eukaryotes. Prokaryotes are almost always unicellular, although some species such as myxobacteria can aggregate into complex structures as part of their life cycle. These organisms are divided into two groups, the archaea and the bacteria.
Bacteria
Bacteria are the most diverse and abundant group of organisms on Earth. Bacteria inhabit practically all environments where some liquid water is available and the temperature is below +140 °C. They are found in sea water, soil, air, animals' gastrointestinal tracts, hot springs and even deep beneath the Earth's crust in rocks.[20] Practically all surfaces which have not been specially sterilized are covered in bacteria. The number of bacteria in the world is estimated to be around five million trillion trillion, or 5 × 1030.
Bacteria are practically all invisible to the naked eye, with a few extremely rare exceptions, such as Thiomargarita namibiensis.They are unicellular organisms and lack membrane-bound organelles. Their genome is usually a single loop of DNA, although they can also harbor small pieces of DNA called plasmids. These plasmids can be transferred between cells through bacterial conjugation. Bacteria are surrounded by a cell wall, which provides strength and rigidity to their cells. They reproce by binary fission or sometimes by budding, but do not undergo sexual reproction. Some species form extraordinarily resilient spores, but for bacteria this is a mechanism for survival, not reproction. Under optimal conditions bacteria can grow extremely rapidly and can double as quickly as every 10 minutes......
微生物是指一切肉眼看不到或看不清楚,因而需要藉助顯微鏡觀察的微小生物。微生物包括原核微生物(如細菌)、真核微生物(如真菌、藻類和原蟲)和無細胞生物(如病毒)三類。
主要特性
微生物最大的特點,不但在於體積微小,而且在結構上亦相當簡單。由於微生物體積極之微小,故相對面積較大,物質吸收快,轉化快。微生物在生長與繁殖上亦是很迅速的,而且適應性強。從寒冷的冰川到極酷熱的溫泉,從極高的山頂到極深的海底,微生物都能夠生存。
由於微生物適應性強,又容易在較短時間內積聚非常多的個體(例如10^10個/毫升的數量級),因此容易篩選並分離到突變株。容易得到微生物突變株的性質,給人類利用與開發微生物帶來廣闊契機,但也是導致抗葯性的內在原因。
微生物的代謝
微生物的代謝指微生物(細胞)內發生的全部化學反應。 微生物的代謝異常旺盛,這是由於微生物的表面積與體積比很大(約是同等重量的成年人的30萬倍),使它們能夠迅速與外界環境進行物質交換。
代謝產物 微生物在代謝過程中,會產生多種代謝產物。根據代謝產物與微生物生長繁殖的關系,可以分為初級代謝產物和次級代謝產物兩類。 初級代謝產物是指微生物通過代謝活動產生的、自身生長和繁殖所必須的物質,如氨基酸、核苷酸、多糖、脂質、維生素等。在不同種類的微生物細胞中,初級代謝產物的種類基本相同。 次級代謝產物是指微生物生長到一定階段才產生的化學結構十分復雜,對該微生物無明顯生理功能,或並非是微生物生長和繁殖所必須的物質,如抗生素、毒素、激素、色素等。不同種類的微生物所產生的次級代謝產物不相同,它們可能積累在細胞內,也可能排到外環境中。
代謝的調節 微生物在長期的進化過程中,形成了一整套完善的代謝調節系統,以保證證代謝活動經濟而高效地進行。微生物的代謝調節主要有兩種方式:酶合成的調節和酶活性的調節。 另外人工控制微生物代謝的措施包括改變微生物遺傳特徵,控制生產過程中的各種條件等。
主要分類
微生物主要分為以下幾類:(參見生物分類總表)
原核微生物
細菌(Bacteria)
古菌(Archaea)
真核微生物
真菌(Fungi)
原生生物(protozoan)
藻類(algae)
無細胞生物
病毒(virus)
類病毒(virusoid)
擬病毒(viroid)
朊毒體(亦稱朊病毒、蛋白質質感染性顆粒)(prion)
微生物在自然界的存在
微生物在自然界中廣泛存在,數目巨大。下表為一些生態環境中微生物細胞數目的估計:
密度 全球總數
海水 108~109 L-1 約1029
海洋沉積物 109 g-1 約3×1029
動物消化道 1011 g-1 約1025
地表或海底下深處 102~108 約1030
原核生物共構成全球生物量的25~50%。
微生物的作用
微生物與人類的生產、生活和生存息息相關。有很多食品(如醬油、醋、味精、酒、酸奶、乳酪、蘑菇)、工業品(如皮革、紡織、石化)、葯品(如抗生素、疫苗、維生素、生態農葯)是依賴於微生物製造的;微生物在礦產探測與開采、廢物處理(如水凈化、沼氣發酵)等各種領域中也發揮重要作用。微生物是自然界唯一認知的固氮者(如大豆根瘤菌)與動植物殘體降解者(如纖維素的降解),同時位於常見生物鏈的首末兩端,從而完成碳、氮、硫、磷等生物質在大循環中的銜接。若沒有微生物,眾多生物就失去必需的營養來源、植物的纖維質殘體就無法分解而無限堆積,就沒有自然界當前的繁榮與秩序或人類的產生與維續。
此外,微生物對地球上氣候的變化也起著重要作用。許多微生物直接參與了溫室氣體的排放或者吸收,而也有很多微生物可以成為未來的生物燃料[1]。
微生物與人類健康
微生物與人類健康密切相關。多數微生物對人體是無害的。實際上,人體的外表面(如皮膚)和內表面(如腸道)生活著很多正常、有益的菌群。它們占據這些表面並產生天然的抗生素,抑制有害菌的著落與生長;它們也協助吸收或親自製造一些人體必需的營養物質,如維生素和氨基酸。這些菌群的失調(如抗生素濫用)可以導致感染發生或營養缺失。然而另一方面,人類與動植物的疾病也有很多是由微生物引起,這些微生物叫做病原微生物(pathogenic microorganism)或病原(pathogen)。重要的人類致病微生物列於下表中。
主要的人類致病微生物 疾病名稱 致病原 全球感染(攜帶者)人數 每年新發病例數 每年死亡人數
結核 結核分枝桿菌 ~20億人(全球三分之一人口) 881萬例 (2003 [1]) 175萬人 (2003 [2])
艾滋病 人類免疫缺陷病毒 4200萬人 550萬例 310萬人
痢疾 志賀氏菌、痢疾桿菌、大腸埃希氏桿菌等 27億例 190萬人
瘧疾 瘧原蟲 3-5億例 100萬人
乙型肝炎 乙型肝炎病毒 1000-3000萬例 100萬人
麻疹 麻疹病毒 3000萬例 90萬人
登革熱 登革病毒 2000萬例 2萬4千人
流感 流感病毒 幾乎全部人口 300-500萬例 25萬人
黃熱病 黃熱病毒 20萬例 3萬人
其他經常聽說的致病微生物還有:流行已經完全得到控制或消滅的天花病毒(引起天花)和脊髓灰質炎病毒(導致小兒麻痹症);引起炭疽病的炭疽桿菌;以及近年來顯現的薩斯冠狀病毒(引起嚴重急性呼吸道綜合症,又名薩斯、也俗稱非典型肺炎)和可能將在人類流行的禽流感。
對現代生物學研究與醫學技術的貢獻
現代生物學的若干基礎性的重大發現與理論,是在研究微生物的過程中或以微生物為實驗材料與工具取得的。這些理論包括:
證明DNA(脫氧核糖核酸)是遺傳信息的載體(三大經典實驗:肺炎球菌的轉化實驗、噬菌體實驗、植物病毒的重組實驗)
DNA的半保留復制方式(雙螺旋的每一條子鏈分別、都是復制模板)
遺傳密碼子的解讀(64個密碼子各對應20種氨基酸及終止信號的哪一種)
基因的轉錄調節(operon, promoter, operator, repressor, activator的概念與調節方式)
信使RNA的翻譯調節(terminator)
等等……(請添加)
現在,很多常用、通用的生物學研究技術依賴於微生物,比如:
分子克隆
重組蛋白在細菌或酵母中的表達
很多醫學技術也依賴於微生物。比如:
以病毒為載體的基因治療
㈧ 關於新冠肺炎的英語短文有什麼
Dear Lihua,
I』m glad to receive your email.You asked me to share with you what I』m doing in the epidemic situation.Here are my experiences.
Since the outbreak of novel coronavirus pneumonia in Wuhan in December,2019,I have been staying at home.On the one hand,I pay close attention to the epidemic situation through watching CCTV news or surfing the Internet;on the other hand I insist on studying.
Not only do I read classics, but also I have online courses given by my teachers.Besides,I take exercise every day to keep healthy.Faced with the disaster,many people including doctors,nurses and scientists act bravely and spare no effort to fight against it.They are real heroes.
Thank you for your concern.I』m looking forward to your reply.
Yours,
Li Hua
參考詞彙有:
疫情 :epidemic situation
新冠肺炎 :novel coronavirus pneumonia
㈨ 用英語寫出預防冠狀病毒的方法
(1) constantly wash hands
(2) Wear certified mask
(3) Don't go to place with many people.