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药物的鉴别方法 洋地黄毒苷
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患者，女，25岁，G1P0，孕38周，风湿性心脏病，心功能Ⅰ～Ⅱ级，胎儿估计2700g，分娩期处理正确的是
Scientists have known for more than two decades that cancer is a disease of the genes. Something scrambles the DNA inside a nucleus, and suddenly, instead of dividing in a measured fashion, a cell begins to copy itself furiously. Unlike an ordinary cell, it never, stops. But describing the process isn’t the same as figuring it out. Cancer cells are so radically different from normal ones that it’s almost impossible to untangle the sequence of events that made them that way. So for years researchers have been attacking the problem by taking normal cells and trying to determine what changes will turn them cancerous - always Without success. According to a report in the current issue of Nature, a team of scientists based at M. I .T.’s Whitehead Institute for Biomedical Research has finally managed to make human ceils malignant -a feat they accomplished with two different cell types by inserting just three altered genes into their DNA. While these manipulations were done only in lab dishes and won’t lead to any immediate treatment, they appear to be a crucial step in understanding the disease. This is a "landmark paper," wrote Jonathan Weitzman and Moshe Yaniv of the Pasteur Institute in Paris, in an accompanying commentary. The dramatic new result traces back to a breakthrough in 1983, when the Whitehead’s Robert Weinberg and colleagues showed that mouse cells would become cancerous when subjected to two altered genes. But when they tried such alterations on human cells, they didn’t work. Since then, scientists have learned that mouse cells differ from human cells in an important respect: they have higher levels of an enzyme called telomerase. That enzyme keeps caplike structures called telomeres on the ends of chromosomes from getting shorter with each round of cell division. Such shortening is part of a cell’s aging process, and since cancer cells keep dividing forever, the Whitehead group reasoned that making human cells more mouselike might also make them cancerous. The strategy worked. The scientists took connective-tissue and kidney cells and introduce three altered genes—one that makes cells divide rapidly; another that disables two substances meant to rein in excessive division; and a third that promotes the production of telomerase, which made the cells essentially immortal. They’d created a tumor in a test tube. "Some people believed that telomerase wasn’t that important," says the Whitehead’s William Hahn, the study’s lead author. "This allows us to say with some certainty that it is.\ One key factor in creating tumor with human cells is ______.
药物中的特殊杂质 盐酸普鲁卡因注射液
王某携全家老小赴深圳经商，于是将几件不易携带但又较为贵重的家具交给邻居周某保管，其中包括价值4000元的全自动洗衣机一台。与此同时，周某委托王某将自己一个祖传的手镯带到深圳去卖掉，价格以市场价为准。王某到达深圳后，经调查，该手镯的市场价为1万元，正当王某准备拿到市场上卖掉时，其好友秦某前来探望，并发现了该手镯。王某告知了该手镯的情况，秦某表示特别喜欢该手镯，请王某以5000元的价格卖给他，并许以好处。王某考虑再三，答应了秦某的要求。周某后来得知了此事，遂要求王某赔偿损失，但王某坚称5000元即是市场价格，拒绝赔偿。周某一气之下将王某的洗衣机以自己的名义卖给了不知情的谭某，谭某支付了价款并实际占有了该洗衣机。问题： 本案中共存在哪几个法律关系？
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