| 词汇 | sebum |
| 释义 | sebum noun[ U ] biology specializeduk /ˈsiː.bəm/ us /ˈsiː.bəm/ an oil-like substance produced by the sebaceous glands in the skin that makes hair shiny and prevents skin from becoming dry皮脂（皮肤上的皮脂腺产生的一种油性物质，可使头发光泽，预防皮肤变干） Substances & structures in the body abductor accessorius ACL actin adductor fundus funiculus fusiform glomerular glomerulus myosin navicular neuroendocrine neurohormonal neurohormone tendinis tendinous tendinum tendo tensor Examples of sebumsebum Each day target 1 (control) was treated with 200 ml of solvent (dichloromethane) and target 2 (test) with 200 ml of sebum solution. The acidic fraction of sebum had no detectable activity, but both the non-acidic and phenolic fractions did. Each day 400 ml of sebum solution in methanol were applied to the test net and 400 ml of methanol were applied to the control. The treatments were alternated between two sites for nine days (as long as the sebum lasted). The presence of flanking nets with or without sebum did not increase the catch of either species significantly. Despite this, the responses of tsetse flies to the skin secretions of hosts (hereafter sebum) have not been extensively investigated in the field. This paper reports a series of experiments designed to investigate the activity of ox sebum on tsetse in the field. The effects of sebum or its fractions were thus tested as additions to this basic attractant. The latter also causes the skin to become dry as sebum production reduces, therefore increasing the possibility of mechanical stress. In the present experiments the sebum extract was crude and the concentrations (in host equivalence per unit time) was not measured. Testing of fractions of sebum revealed active component(s) in the phenolic and non-acidic fractions but not in the acidic fraction. Sebum collected in dichloromethane, and sebum collected in methanol were used in two successive experiments. Treatments 1 and 3-had 200 ml of solvent applied to the target daily and treatments 2 and 4 had 200 ml of sebum solution applied daily. The effect of sebum was to attract more flies to the target rather than to induce a landing response in a higher proportion of attracted flies. As the sebum was applied to the cloth, the electric grids were moved with treatments and thus any difference in the efficiency of the grids is confounded with treatments. 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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