时间:2019-01-02 作者:英语课 分类:60秒科学


英语课

科学家发现杀害疾病传播型蚊子的新方法:干扰其泌尿过程。


Message to Mosquitoes: Urine Trouble


You know how uncomfortable it feels when you really have to go to the bathroom? And you have to hold it in? If researchers get their way, disease-carrying mosquitoes will spend their last moments being that uncomfortable. Cornell University scientists [Peter M. Piermarini, et al] have been trying to disrupt the life cycle of Aedes aegypti mosquitoes, which spread dengue fever. The mosquitoes pick up the virus when they feed on one human and transmit it in their saliva 1 to their next victim.


There’s no vaccine 2 for dengue, and no fully 3 protective treatment. So the only recourse has been to figure out how to best kill the mosquitoes themselves. Here’s where urination comes in. When the mosquito takes a blood meal, it has to get rid of fluid and salt so it doesn’t overload—and die. Scientists have discovered a key protein in the renal tubes of these mosquitoes that helps with the necessary excretion. Blocking the protein keeps a mosquito from urinating. Without whizzing, they become too heavy to fly away. The researchers say they’re thus more likely to be swatted or eaten. So look for new insecticides that stop mosquitoes from lightening their liquid load. With fatal results.


—Cynthia Graber

 



n.唾液,口水
  • He wiped a dribble of saliva from his chin.他擦掉了下巴上的几滴口水。
  • Saliva dribbled from the baby's mouth.唾液从婴儿的嘴里流了出来。
n.牛痘苗,疫苗;adj.牛痘的,疫苗的
  • 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。
adv.完全地,全部地,彻底地;充分地
  • The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气,然后全部呼出。
  • They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。
学英语单词
acidol-pepsin
agave families
Alfcol
alpha-lactam
aluminized method
anuwat
asciiz string
automatic diaphragm control
average sampling inspection quality limit
be at loose ends
blacktop paver
breeching bolt
buffet boundary
building flow zones
Burke's Peerage
bypass anode
cercospora jatrophicola
christensens
clay pick
computer architecture level
congnition
cryptographic ignition key
deformity of rectum
Dhali
diamond type winding
Dryopteridaceae
duplex spot weld
endotoxoids
enfamous
enfant terribles
epically
ferro-magnesian retgersite
flow time
generic safety report
globaline
GTFO
Jerusalem cross
juiz
Lasianthus kerrii
leaa
legal business
lesbianization
low-frequency cable line
luggage floor mat
malt carbohydrase
Marinesco-Sjogren Garland syndrome
mega-amps
mestite
metal clad switchgear
minimum curve radius
misdeal
MLW
mobile oil testing equipment
murky waters
nealon
Neisseria pharyngis
niffiest
Nomtsas
nonketotic hyperosmolar coma
note payable to bearer
observation deck
Ollier-Thiersch free skin graft
on black
oothecostomy
orange-and-yellow
orange-river
outvenomed
overdependent
pat-terns
paved shoulder
perforation fluid
PMAI
programming logic chart
progress of fracture
provisional unit
pseudo wet-bulb potential temperature
reyche
seek...in the bottle
shipping route
Shirokawa
spsi
square-law detection
structured objective
T effector cell
thamnobryum sandei
thermochronology
thoroughbred races
tilemakers
towing operation
travelling mast
Tyap
Télimélé, Rég.Adm.de
ultrahip
unapplied expenses allocation
wacke
waggon headed vault
walking dream
walking ferns
watershed management
wheel tree
whinge
winding-engine