| 词汇 | stoma |
| 释义 | stoma noun[ C ] biology specializeduk /ˈstəʊ.mə/ us /ˈstoʊ.mə/pluralstomata one of the many pores (= very small holes in the surface) on a leaf or stem of a plant through which gases are able to pass in and out（植物叶子或茎表面的）气孔 Parts of plants axil bark bilobed blade bulb caning cascara sagrada corolla endodermis floret inflorescence knot pistil rooty rosella seed coat seed pod sessile sting taproot Examples of stomastoma The number of stomata was counted at each point, using a microscope with a lattice micrometer. The distribution of the stomata could not be determined, but their polar axis lies along the length of the leaf. In the adult worm, this papilla becomes dome-shaped with a small central stoma. The stomata were observed to respond to changing ambient conditions within three minutes. A distal stoma allows bowel function to recover. However, water loss can also occur across the trichomes and the cuticle when stomata are closed. This was also true for the upper epidermis of tannia and sweet potato where stomata were present. The consequence is a prolonged requirement for parenteral nutritional support, and sometimes further surgery, usually involving stoma formation. They too observed partial closure of the stomata during the day, even in irrigated trees. Fifty patients from an urban practice were included in the study and their stoma care needs were assessed. There also has to be psychological acceptance of the stoma by the patient. This species had two types of stomata, large and small. These two species did not have stomata on the upper epidermis. In the majority of patients bowel control is achieved because they have a stoma. Because of the capacity of stomata to control water loss, relative turgidity measurements do not appear to be a good measure of plant water status. 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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