| 词汇 | protrusion |
| 释义 | protrusion noun[ C or U ] uk /prəˈtruː.ʒən/ us /prəˈtruː.ʒən/ something that sticks out from a surface, or the act of doing this: 突出物;伸出，凸起 It has a series of protrusions along its back.它背上有一连串的凸起。 The condition results in weight loss, rapid heart beat and protrusion of the eyes.这种病会导致体重下降、心动过速和眼球凸出。 Protruding and sticking out beetling bristly bug bug out bulbous bulge ledge male outcrop overhang overhanging peek poke project protuberance protuberant proud stick stick out stick up Examples of protrusionprotrusion Visible germination was defined as radicle protrusion of 1 mm or more. In this case, radicle extension also took place early during incubation, but inside the seed, enabling the radicle to find the hole for visible protrusion. The criterion for seed germination was visible radicle protrusion. This was obtained by placing a finite protrusion on one of the lateral walls (see figure 16). Mitochondria were isolated and purified at early stages of germination (before radicle protrusion), and their oxidative properties, membrane integrity and ultrastructure were examined. This was usually followed by macroscopic changes in leaf surface structure, namely protrusion of the minor leaf veins. The majority, if not all, of the species evaluated have seeds that produce ethylene prior to, or concomitant with, radicle protrusion. Mitochondria were isolated from fully imbibed seeds (12 h) and at the end of germination (22 h), just before radicle protrusion. When emerged males were present, the courtship process commenced immediately upon the protrusion of the female's head from the emergence hole. At the commencement of the emergence trial, germinated seeds (radicle protrusion of 1-2 mm) were selected from each treatment and planted. The spermatozoon is completely surrounded internally by microtubules and externally by dense material representing the external ornamentation except around the protrusion. At this stage, surface protrusions of the main cell body appeared to be altering from blebs to microridges. For this species there is a good correlation between endosperm cell wall dissolution and radicle protrusion. The mechanisms regulating cell wall extensibility in the embryos before radicle protrusion, although central to germination control, remain elusive. The micropylar endosperm of a seed was considered softened when it required a force of less than 1200 g to cause radicle protrusion. 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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