时间:2019-01-02 作者:英语课 分类:科技之光


英语课

SCIENCE REPORT

March 27, 2002: New Stem Cell Study


By Mario Ritter



This is the VOA Special English SCIENCE REPORT.


Researchers at an American medical center say special stem cells in normal human blood can develop into other
kinds of healthy, new tissue. The new findings could become important in forming public policy concerning stem
cell research.



Adult stem cells are unformed cells that exist in the blood and blood-making tissue of the
body. Researchers at M-D Cancer Center in Houston, Texas say adult stem cells taken from
blood can create new tissue in several organs.


They made the discovery after examining about twelve patients who had received blood from
family members. The blood was rich in the rare stem cells that make red and white blood cells.


The patients needed the blood and stem cells after cancer treatments had destroyed the ability of their own bone
marrow 1 to make new blood cells. The doctors had thought the stem cells would only restore the patients’
ability
to make new blood cells.


However, they found that some of the stem cells spread to the patients’
livers and began to grow liver cells.
Some of the stem cells also grew into skin cells and cells in the intestine 2. The researchers said some of the stem
cells settled into the patients

organs within two weeks.


The research was published in the New England Journal of Medicine.


The doctors who did the research say the tests prove that adult stem cells can become liver, skin and other kinds
of cells. The experiment appears to show that adult stem cells are more useful than medical researchers had
thought.


Until recently, doctors did not think that adult stem cells could produce new tissue in organs. For this reason,
many people have urged Congress to permit research on embryonic 3 stem cells taken from fertilized 4 human eggs.
These unformed embryonic stem cells are believed to be able to become any kind of tissue in the body. However,
the Bush administration has put limits on embryonic stem cell research. President Bush believes it is not moral to
experiment on fertilized human eggs.


If confirmed, the new discovery will add to the debate over stem cells. It will also strengthen the idea that adults
have cells that can repair damage to organs. And experts say it could lead to new treatments for diseases based on
using the body ’s own cells.


This VOA Special English SCIENCE REPORT was written by Mario Ritter.



Email this article to a friend
Printer Friendly Version



n.骨髓;精华;活力
  • It was so cold that he felt frozen to the marrow. 天气太冷了,他感到寒冷刺骨。
  • He was tired to the marrow of his bones.他真是累得筋疲力尽了。
adj.内部的;国内的;n.肠
  • This vitamin is absorbed through the walls of the small intestine.这种维生素通过小肠壁被吸收。
  • The service productivity is the function,including external efficiency,intestine efficiency and capacity efficiency.服务业的生产率是一个包含有外部效率、内部效率和能力效率的函数。
adj.胚胎的
  • It is still in an embryonic stage.它还处于萌芽阶段。
  • The plan,as yet,only exists in embryonic form.这个计划迄今为止还只是在酝酿之中。
v.施肥( fertilize的过去式和过去分词 )
  • The study of psychology has recently been widely cross-fertilized by new discoveries in genetics. 心理学研究最近从遗传学的新发现中受益匪浅。
  • Flowers are often fertilized by bees as they gather nectar. 花常在蜜蜂采蜜时受粉。
学英语单词
A-300
Ahémè, L.
alcaydes
allopath, allopathist
antheridiums
Araltobe
asymbiotic nitrogen fixation
at sb's service
automatic radiotelegraph keying device
automatic tire pump
backslope, back slope
bast-court
bear -leading
Bogangolo
Bonfire Night
calx natrica
carnifexes
central projection
chargeable tonnage
coated rod
control valve for fluids
corona preventive screen
cotton waster
covariant system
credit lines
cubic coordination
cyclematics
determa
dispatching
diversion gate
dress goods
elastic-plastic range
enzyms
fahids
fibroma myxomatodes
field simultaneous colour television
finite-difference formula
firing expansion
flesh-tone
flux solder connection
funniess
ghostballs
Great Dog
halterneck
heat stabilized bearing
herdswoman
Homalocephala
I-column
immunorheophoresis
indirect investigation
induction disk relay
laterosporamine
lines of merchandise
logic master module
magnetic quantity sensor
master level control
mexican position
Mini Mouse
molar parachor
Mongolian lark
motavalli
multi-jet
neng
neutron width
New Norfolk
nickle and dime
oilfield gas injection
optima
orange liqueurs
organburg
paraphs
partial state machine
pastoresses
pettish
photometrically
PI8
pie filling
pineal calculus
Pisonia grandis
poly(ethylene oxide)
problem-solving language
Pulsatilla turczaninovii
reaction cycle time
red bed
repursuing
resting membrane electric potential
scientific explanation
solid dung
speak highly of
talking circuit
tapises
Tautama
technical inspector
toll enrichment
trietbhlene glycol
true rising and setting
unicomponent peak
up to the nines
verade
welding die
zwitterionic buffer