| Two techniques have recently been
developed to simplify research and reduce the number of nonhuman primates needed
in studies of certain complex hormonal reactions. One technique involves the
culturing of primate pituitary cells and the cells of certain human turnouts. In
the other, animal oviduct tissue is transplanted under the skin of laboratory
primates. Both culturing techniques complement existing methods of
studying intact animals. 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 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 [多项选择]Question 1 Look at the graph below which shows the sales of some durable goods between the years of 2004 and 2009 in City A. Using the information from the graph, write a short report describing and comparing the sales of the durable goods in 2004 and 2009. Write 120-140 words.
|
