Rank-abundance curvesFriedemann Goral
OTUrankcurve（RankAbundance曲线）【基本概念】16S结题报告中都会有这么⼀张图：这张图是OTU Rank曲线，该曲线可以展⽰样品的多样性。⽽样品的多样性常通过以下两个⽅⾯ 进⾏解释：物种的丰富程度和均匀程度。Rank曲线中，曲线在横轴上的跨度越长，表明样品的 物种含量越丰富；曲线越平坦，表⽰样品的...
则表明样本中的优势菌群所占比例高,多样性低。 relative abundance:就是该OTU所包含的序列数除以总的序列数,从上图可以看出丰度最高的OTU在10%~100%。 不搞清楚原理,这张图还是很难理解的。 这有点类似于计算N50,把所有OTU按照相对丰度排序,然后一个一个叠加,假设第一个OTU20%,第二个OTU15%,然后依次往后画...
则表明样本中的优势菌群所占比例高,多样性低。 relative abundance:就是该OTU所包含的序列数除以总的序列数,从上图可以看出丰度最高的OTU在10%~100%。 不搞清楚原理,这张图还是很难理解的。 这有点类似于计算N50,把所有OTU按照相对丰度排序,然后一个一个叠加,假设第一个OTU20%,第二个OTU15%,然后依次往后画...
Figure 22.13.Organism breakdown: sample rank abundance plot by phylum. Therarefactioncurve of annotated species richness is a plot of the total number of distinct species annotations as a function of the number of sequences sampled. The slope of the right-hand part of the curve is related to ...
A possible way to present some properties of a theoretical or empirical SAD is the construction of a rank-abundance curve (RAC). With regard to the applicability of the RAC as a widely used indicator of the structure of a multispecies community and of the ecological status of its habitat, ...
For example, if any of the microarray processing steps (labeling, hybridization, scanning, etc.) are non-linear functions of transcript abundance, and the conditions affecting these non-linear functions change from array to array or with biologic condition due to unbalanced gene expression, then ...
For example, if any of the microarray processing steps (labeling, hybridization, scanning, etc.) are non-linear functions of transcript abundance, and the conditions affecting these non-linear functions change from array to array or with biologic condition due to unbalanced gene expression, then ...
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Spectral unmixing-based methods unmix the latent HR-HSI into underlying pure endmembers matrix and HR abundance matrix. For example, the coupled nonnegative matrix factorization (CNMF) method (Yokoya et al., 2012) alternately unmixes each image base on the linear mixture model to generate a new...