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细胞周期 cell cycle
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更多“细胞周期 cell cycle”相关的问题
第1题
To: Jack-Doe2006@yahoo. com
From: George. Gilhooley@yahoo. com
Subject: Application for the Programmer Position
Date: July 28, 2009
Dear Mr. Jack Doe,
I am writing to apply for the programmer position advertised in the Times Union. As requested, I am enclosing a completed job application, my certification, my resume and three references.
The opportunity presented in this listing is very interesting, and I believe that my strong technical experience and education background will make me a very competitive candidate for this position. The key strength that I possess for success in this position include:
I have successfully designed, developed, and supported live use applications.
I strive for continued excellence.
I provide exceptional contributions to customer service for all customers.
With a BS degree in Computer Programming, I have a full understanding of the full life cycle of a software development project. I also have experience in learning and excelling at new technologies as needed.
Please see my resume for additional information on my experience.
I can be reached anytime via e-mail at george. gillhooley﹫yahoo, com or my cell phone, 909-426-537.
Thank you for your time and consideration. I look forward to speaking with you about this employment opportunity
Sincerely,
George Gilhooley
Enclosure: Resume and other relative files
To: Jack - Doe2006@ yahoo. com
From: George. Gilhooley@yahoo. com
Subject: Confirmation
Date: August 3, 2009
Dear Mr. Jack Doe,
I submitted a letter of application and a resume earlier this month for the programmer position advertised in the Times Union. To date, I have not heard from your office. I would like to confirm receipt of my application and reiterate my interest in the job.
I am very interested in working at Sycamore Company and I believe my skills and experience would be an ideal match for this position.
If necessary, I would be glad to resend my application materials or to provide any further information you might need regarding my candidacy. I can be reached at 909-426-537 or george. gillhooley@yahoo. com. I look forward to hearing from you.
Thank you for your consideration.
Sincerely,
George Gilhooley
What is Mr. Jack Doe's profession？
A．An accountant of the Sycamore
B．The chief editor of the Times Union
C．The personnel manager of Sycamore Company
D．A colleague of George Gilhooley
第2题
Meanwhile, in a larger chamber down the hall, Glass is monitoring tropical monkeys. He has found that exercise and arousal from sleep have major impacts on the biological rhythms of the monkeys, permanently shifting their clocks in the absence of normal daylight and darkness cues.
Glass's research and that of others could have implications for the millions of people who take com monanti-depressants and other drugs that affect serotonin in the brain. It has long been known that the substance is a key player in the biological clock, and that the region has an unusually high concentration of receptors for the neurotransmitter.
Glass's work is part of the fast-growing field of circadian(or daily)rhythm research focused on a region at the base of the brain, the size of a corn kernel, that scientists discovered 25 years ago is the body's timing mechanism.
Like other animals and even plants, humans have built-in clocks that regulate internal functions on a 24-hour basis. For most mammals, the clocks trigger sleep and waking, as well as metabolism, hor mone levels, body temperature and many other changes. This is a particularly exciting time for circadian-rhythm researchers. In recent times, scientists at universities in Illinois, Texas and Japan have found genes involved with the clock, including one that appears to be a basic building block of the mechanism and is common across all species, from fruit flies to humans. Meanwhile, researchers like Glass, whose work has attracted US $1.2 million(9.6 mil lion RMB)in grants from the National Institute of Health, are trying to understand how the clock works.
Sitting on top of the optic nerve, the clock is heavily influenced by light. But other factors, too, are involved in resetting the mechanism, most notably physical activity and substances like serotonin. Glass and his students found that, when lights in the hamster chamber were switched off, the serotonin levels in the rodents'clock region shot up: hamsters are nocturnal, meaning they rest during the day and are awake at night. But when hamsters in the midst of their sleep cycle were put onto an activity wheel, a significant rise in serotonin levels was measured in those hamsters that woke up enough to ex ercise.
It has long been known that serotonin is key to body clock function, according to Thomas Wehr, a scientist at the National Institute of Mental Health in Bethesda, Maryland. Researchers at the Mary land Institute took cells from the clock region of the brain, sprinkled serotonin on them and, by monito ring electrical impulses, watched the cells "reset" themselves.
"There are certain drugs used with humans that have also been squirted on these cells in dishes and have been shown to reset the clock in the dish, so it seems quite possible there are similar effects in hu mans who take these drugs. "Wehr says. Indeed, some people taking anti-depressants do report sleep disorders such as insomnia or daytime drowsiness that could be related to changes in their biological clocks. Human studies have yet to focus on the issue.
Studies have found that serotonin affects the clock in different ways, depending on the point in the cell's daily cycle that it is administered. Glass rece
A．Y
B．N
C．NG
第8题
A.4 cycle to local L1
B.9 cycle to local L2
C.25~33 cycle to local partition L3
D.16- 25 cycle to remote partition L3
第9题
A.the accounting cycle or one year, whichever is shorter.
B.the operating cycle or one year, whichever is longer.
C.the accounting cycle or one year, whichever is longer.
D.the operating cycle or one year, whichever is shorter.
