| 词汇 | tropism |
| 释义 | tropism noun[ U ] biology specializeduk /ˈtrəʊpɪzəm/ us /ˈtroʊpɪzəm/ the fact of living things turning towards or away from something, for example light（生物的）向性 Examples of tropismtropism These differences include their infectivity in host cells, virulence and pathogenesis in animal models, drug sensitivity, tissue tropism, morphology, and antigenic composition. The molecular basis for receptorbinding specificity and the role this plays in viral tropism and host range is not as clear-cut as is often portrayed. These vectors can efficiently transduce dividing and nondividing cells and have broad tissue tropism. The virus also has gastrointestinal tropism in various bird species. The virus exhibits multiple cell tropisms, infecting peripheral blood mononuclear cells and skin cells before establishing latency in sensory neurons. The transmission route could even be linked to host specificity and virulence or tissue tropism. The incentives for these tropisms, again, are too complex to summarize here. Topics covered include: energy flow, water relations, mineral nutrition, translocation, growth, hormones, cell growth and differentiation, vegetative and reproductive development, photomorphogenesis, tropisms and resistance to stress. Urbanczyk (1996, 2000) formalises this implicit assumption by appealing to the notion of 'tropism ', which is used in referring to edges. Rolls rejects this definition since he wishes to eliminate taxes, tropisms, and reflexes. Cunningham (1956) described the tropisms (taxes) of various stages of this same nematode, observing the direction of migration in inclined closed tubes. Yet bacteria of all those colonies communicate for tropism in shared tasks, coordinated activities and exchange of relevant genetic bacterial information using biochemical communication of meaning-bearing semantic messages. However, this is not a form of tropism, but a nastic movement, a similar phenomenon. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The difference is that tropisms are influenced by the direction of their stimulus, while nastic movements are not. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. One of the nucleotide mutations is in the process of glycoprotein formation and affects tropism. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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