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231.
Tight junction strands are lipidic cylinders 总被引:1,自引:0,他引:1
H. W. Meyer 《Die Naturwissenschaften》1983,70(5):251-252
232.
233.
Ingeborg Meyer 《Die Naturwissenschaften》1957,44(24):635-636
234.
D. L. Meyer 《Marine Biology》1971,9(3):235-241
A major adaptive problem among comatulid crinoids is the need for a system of articulation and muscularization of the skeleton which provides rigidity in the cirri, arms, and pinnules for maintaining position and feeding in moving water masses, and also the ability to undergo occasional rapid flexions. Most skeletal ossicles of comatulids are united by so-called ligament fibers, while arm articulations possess masses of muscle as well as ligament. Light and electron microscopic work shows that the ligament consists primarily of collagen fibers. Similarity of this dual system of crinoid arm musculature to the muscles and collagenous catch apparatus of echinoid spines suggests that the crinoid ligaments may provide the needed rigidity to the crinoid skeleton, in a manner similar to that by which the echinoid catch apparatus can hold the spine tightly to the test in one position. 相似文献
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The Science of Nature - 相似文献
237.
Cassel T Ashbaugh L Flocchini R Meyer D 《Journal of the Air & Waste Management Association (1995)》2005,55(6):816-825
Ammonia emissions contribute to the formation of secondary particulate matter (PM) and violations of the National Ambient Air Quality Standard. Ammonia mass concentration measurements were made in February 1999 upwind and downwind of an open-lot dairy in California, using a combination of active bubbler and passive filter samplers. Ammonia fluxes were calculated from concentrations measured at 2, 4, and 10 m above ground at three locations on the downwind edge of the dairy, using micrometeorological techniques. A new method was developed to interpolate fluxes at six additional locations from ammonia concentrations measured at a single height, providing measurements at sufficient spatial resolution along the downwind border of the dairy to account for the heterogeneity of the source. PM measured up- and downwind of the dairy demonstrated insignificant ammonium particle formation in the immediate vicinity of the dairy and negligible contribution of dissociated ammonium nitrate to measured ammonia concentrations. Ammonium nitrate concentrations measured downwind of the dairy ranged from 26 to 0.26 microg m(-3) and from 2 to 43% of total PM2.5 mass concentrations. Measured ammonia fluxes showed that liquid manure retention ponds represented relatively minor sources of ammonia in winter on the dairy studied. Ammonia emission factors derived from the measurements ranged from 19 to 143 g head(-1) day(-1), showing an increase with warmer, drier weather and a decrease with increased relative humidity and lower temperatures. 相似文献
238.
239.
Gundolf Meyer 《Die Naturwissenschaften》1967,54(18):489-490
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