10.1946年,George Scatchard用溶液的渗透压测定了牛血清蛋白的分子量,他将9.63g蛋白质配成1.00dm3水溶液,测
10.1946年,George Scatchard用溶液的渗透压测定了牛血清蛋白的分子量,他将9.63g蛋白质配成1.00dm3水溶液,测得该溶液在298K(25℃)时的渗透压为0.353kPa,计算牛血清蛋白的分子量。如果该溶液的密度近似为1.00g·cm-3,能否用凝固点下降法测定蛋白质的分子量?为什么?(水的Kf=1.86K·kg·mol-1)
10.1946年,George Scatchard用溶液的渗透压测定了牛血清蛋白的分子量,他将9.63g蛋白质配成1.00dm3水溶液,测得该溶液在298K(25℃)时的渗透压为0.353kPa,计算牛血清蛋白的分子量。如果该溶液的密度近似为1.00g·cm-3,能否用凝固点下降法测定蛋白质的分子量?为什么?(水的Kf=1.86K·kg·mol-1)
A.How have you been?
B.Pleased to meet you, George.
C.Mind if call you George?
D.The pleasure's mine.
A.popularity
B.population
C.popularization
D.polar
A.often
B.little
C.young
D.well
A.Thomas Aquinas
B.Thomas Becket
C.St Augustine
D.St George
A.William Butler Yeats
B.John Galsworthy
C.James Joyce
D.George Bernard Shaw
A.the English Channel
B.the Irish Sea
C.St. George's Channel
D.the North Sea
According to following information, please write an application letter for salary
(1) You are George, and your boss is Mr. Smith.
(2) Your reasons for the letter
(3) Your expectation for the salary raise
Many people in the United States worry about not looking young and attractive. For many people, looking good also means being thin. Other people worry about their health. Many doctors say being overweight is not healthy. But are Americans really fat?
Almost 30 million Americans weigh at least 20 percent more than their ideal weight. In fact, the United States is the most overweight country in the world. "The stored fat of adult Americans weighs 2. 3 trillion pounds," says University of Massachusetts anthropologist(人类学家) George Armelagos. He says burning off that stored energy would produce enough power for 900,000 cars to go 12,000 miles.
Losing weight is hard work, but most people want to find a fast and easy way to take off fat. Bookstores sell lots of diet books. These books tell readers how to lose weight. Each year, dozens of new books like these are written. Each one boasts to help people to get rid of fat.
Which of the following is NOT mentioned as a way of losing weight?
A.To eat less fats and sugars.
B.To take much exercise.
C.To have surgery.
D.To work hard.