词汇 | algal |
释义 | BETA Examples of algalalgal isn’t in the Cambridge Dictionary yet. You can help! Figure 4e shows a resedimented fragment of an algal layer. These algal mats are said to be rich in phosphates, nitrogen, organic matter, and cation-exchange capacity. The reworked component includes red algal debris and clasts encrusted by bryozoans. They changed diurnally in consort with presumed changes in plant and algal photosynthetic activity. The organic matter and lumps of fragmented, resedimented algal layers are dispersed within the mineral matrix. Other contributing factors may be a reduction in light due to greater phytoplankton in the -oodwater and possibly epiphytic algal growth on the submerged leaves. These algal cells grow in clusters under artificial cultivation conditions. At three sites of such fullerene discoveries the building blocks for these large molecules may have come from algal remains. The media composition indeed influenced the algal growth. At one level, a petrified forest comprising silicified tree trunks surrounded by a concentric algal coat signifies a continental to lagoonal environment. These sediments were found to be mixed with each other and intermingled with an algal mat, which consisted of cyanobacteria. We interpret these black dots as being the degradation products of algal cells composed of organic matter, probably of a kerogen nature. During dehydration, fractures at the top and the bottom of the algal layer and at the transition zone of the siderite layer are formed. Salinity was measured weekly and water was changed once a month to prevent algal accumulation. Estimations of the relative contribution of primary archaeal and algal sources to the uppermost black shale can only be tentative. The latter species, are algal feeders and higher rainfall and humidity may reduce the risk of desiccation, thus increasing the time available for foraging. |
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