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 [填空题]The author worries about the colleges which have too few or too many students.
[简答题] Life is indeed full of problems on which we have to make decisions, as citizens or as private individuals. But neither the real difficulty of these decisions, nor their true and disturbing challenge to each individual, can often be communicated through the mass media. The disinclination to suggest a real choice of individual decision, which is to be found in the mass media, is not simply the product of a commercial desire to keep the customers happy. It is within the grain of mass communications.
The organs of the Establishment, however well intentioned they may be and whatever their form (the State, the Church, voluntary societies, political parties), have a vested(既得的)interest in ensuring that the public boat is not violently rocked and will so affect those who work within the mass media that they will be led insensibly towards forms of production which, though they go through the motions of dispute and enquiry, do not break through the skin to where such enquiries might reall
我来回答: 提交
|