| 词汇 | sandfly |
| 释义 | sandfly noun[ C ] uk /ˈsændˌflaɪ/ us /ˈsændˌflaɪ/ a flying, biting insect found in areas where there is a lot of sand: 沙蝇 He contracted a parasite-borne infection spread by sandflies.他被感染了一种通过沙蝇传播的寄生虫。 EzumeImages/iStock/Getty Images Plus/GettyImages Examples of sandflysandfly Immunoblot analysis has revealed striking specificity of antigen components in the 3 sandfly species studied. Possibly a similar difference in preference could be found amongst different sandfly species. None of the 1469 sandflies from 44 feeding trials were infected on dissection. The composition of sandfly saliva varies considerably between species and even between populations of different geographical origin. When bloodmeal digestion is completed the sandflies feed on sugar meals and the parasites migrate forwards. From these 271 sandflies hatched and 22 larvae remained in diapause, of which 13 hatched within 1 to 2 months and the rest died. Overall, these results may have important implications for sandfly trap design. Whereas the majority of the single pots started hatching on the 46th day, the first sandflies from pot no. 223 hatched on the 60th day. Irregularity in the appearance of different larval stages and the hatching of isolated sandflies or of small batches over several weeks signify unfavourable conditions. Female sandflies were not blood-fed but both males and females were allowed access to a saturated solution of sucrose. Only 14 sandflies hatched and 94 larvae remained hibernating. He assumed an intoxication of the eggs in the body of the sandfly as the cause of this phenomenon. Usually a few males hatch first and a few sandflies only hatch later than the majority. Firstly, widespread populations of these sandflies are naturally infected. Unfortunately the feeding preferences of the different species of sandflies do not allow this. 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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