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A.autografts
B.isografts
C.homografts
D.heterografts
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更多“Grafts used for transplantation from a different species are ____.”相关的问题
A.autografts
B.isografts
C.homografts
D.heterografts
With an in vitro culturing technique, researchers are deciphering how biochemical agents regulate the secretion of prolactin, the pituitary hormone that promotes milk production. The cultured cells survive for as long as a month, and they do not require serum, a commonly used culture ingredient that can influence cellular function and confound study results. One primate pituitary gland may yield enough cells for as many as 72 culture dishes, which otherwise would require as many animals.
The other technique allows scientists to monitor cellular differentiation in the reproductive tracts of female monkeys. While falling short of the long-sought goal of developing an in vitro model of the female reproductive system, the next-best alternative was achieved. The method involves transplanting oviduct tissue to an easily accessible site under the skin, where the grafted cells behave exactly as if they were in their normal environment. In about 80 percent of the grafts, blood vessels in surrounding abdominal skin grow into and begin nourishing the oviduct tissue. Otherwise, the tissue is largely isolated, walled off by the surrounding skin. A cyst forms that shrinks and swells in tandem with stages of the menstrual cycle. With about 80 percent of the grafts re-establishing themselves in the new site, a single monkey may bear as many as 20 miniature oviducts that are easily accessible for study. Because samples are removed with a simple procedure requiring only local anaesthesia, scientists can track changes in oviduct cells over short intervals. In contrast, repeated analysis of cellular changes within the oviduct itself would require abdominal surgery every time a sample was taken--a procedure that the animals could not tolerate.
Scientists are using the grafting technique to study chlamydia infections, a leading cause of infertility among women. By infecting oviduct tissues transplanted into the abdominal skin of rhesus monkeys, researchers hope to determine how the bacteria cause pelvic inflammatory disease and lesions that obstruct the oviduct. Such research could eventually lead to the development of antibodies to the infectious agent and a strategy for producing a chlamydia vaccine.
This passage deals primarily with ______.
A．reproductive organs of nonhuman primates
B．diseases of the pituitary glands
C．in vitro studies of pituitary hormones
D．techniques for studying hormonal reactions
With an in vitro culturing technique, researchers are deciphering how biochemical agents regulate the secretion of prolactin (催乳激素), the pituitary hormone that promotes milk production. The cultured cells survive for as long as a month, and they do not require serum (血清), a commonly used culture ingredient that can influence cellular function and confound study results. One primate pituitary gland may yield enough cells for as many as 72 culture dishes, which otherwise would require as many animals.
The other technique allows scientists to monitor cellular differentiation in the reproductive tracts of female monkeys. While falling short of the long-sought goal of developing an in vitro model of the female reproductive system, the next-best alternative was achieved. The method involves transplanting oviduct tissue to an easily accessible site under the skin, where the grafted cells behave exactly as if they were in their normal environment. In about 80 percent of the grafts, blood vessels in surrounding abdominal skin grow into and begin nourishing the oviduct tissue. Otherwise, the tissue is largely isolated, walled off by the surrounding skin. A cyst (囊胞) forms that shrinks and swells in tandem(一前一后的串联) with stages of the menstrual cycle. With about 80 percent of the grafts reestablishing themselves in the new site, a single monkey may bear as many as 20 miniature oviducts that are easily accessible for study. Because samples are removed with a simple procedure requiring only local anesthesia, scientists can track changes in oviduct cells over short intervals. In contrast, repeated analysis of cellular changes within the oviduct itself would require abdominal surgery every time a sample was taken-a procedure that the animals could not tolerate.
Scientists are using the grafting technique to study Chlamydia (衣原体) infections, a leading cause of infertility among women. By infecting oviduct tissues transplanted into the abdominal skin of rhesus (罗猴) monkeys, researchers hope to determine how the bacteria cause pelvic inflammatory disease and lesions (损害) that obstruct the oviduct. Such research could eventually lead to the development of antibodies to the infectious agent and a strategy for producing a Chlamydia vaccine.
This passage deals primarily with ______.
A．reproductive organs of nonhuman primates
B．diseases of the pituitary glands
C．in vitro studies of pituitary hormones
D．techniques for studying hormonal reactions
A.Begin Tran、Commit、RollBack
B.Begin、Continue、End
C.Create Tran、Commit、RollBack
D.Begin Tran、Continue、End
SQL语句“COMMIT TRAN [FSACTION〕]事务名”的作用是:回滚一个事务。()
The power of ADAS cells to transform. into bone, cartilage and even neurons has been studied for years in test tubes. But Jeffrey Gimble, who studies human ADAS cells at Louisiana State University in Baton Rouge says Longaker's report is an important step forward. "Actually repairing a defect in an animal model had never been done. This is an excellent study." If the same technique works in humans, these cells could be coaxed to mend broken bones and correct other defects in tens of thousands of surgical procedures each year in which bone grafts and prosthetics are now necessary.
Longaker's group tested the ability of ADAS cells to heal four-millimetre-long fractures surgically-induced in the skulls of mice. In 12 weeks, the cells filled 70 to 90 per cent of the defects, while untreated animals had only unorganized bone formation in less than 10 per cent of the fractures. No extreme genetic manipulation or treatment of the cells was necessary. ADAS cells began manufacturing bone when they were simply laid onto a biodegradable polymer that contained apatite, a compound that naturally occurs in bone. Furthermore, the ADAS cells performed as well as bone marrow stromal cells, which would seem to be more natural architects of bone. It remains to be seen whether human ADAS cells will build bone as effectively. But researchers are excited about the prospects. Human bone marrow stromal cells are already being used in clinical trials as sources of skeleton-building material, but the ADAS cells may have some significant advantages.
Longaker reports that ADAS cells grow seven times faster than the bone marrow cells in the laboratory. And it is relatively easy to harvest more than a litre of fat tissue, even from patients who are not obese. Bone marrow is much less plentiful and must be removed in a painful surgical procedure. Of course, liposuction itself is not a pleasant operation. But according to the American Society of Plastic Surgeons, more than 300,000 people volunteered to have the procedure in 2003 simply for cosmetic reasons. "If the procedure was the first step to healing broken bones or replacing other tissue its popularity could only grow," says Gimble. "Just think of that."
Gimble speaks highly of Longaker in that ______.
A．his work made an unprecedented achievement in the field
B．he proved that ADAS cells contributed a lot to cell therapy
C．his work paved way for ADAS cell application in clinical trials
D．he cured an animal defect that had never been repaired before
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