Linkage single

Single linkage type. Several of these are neutral glucans, eg curdlan. Others are polyanionic homopolymers and, unlike the glucans, also contain acyl groups. 

Figure 7.2 Three main types of homopolysaccharides, a) Single linkage type, eg curdlan. b) Side chain type, eg scleroglycan. c) Branched chain type, eg dextran. The figure also show various ways of illustrating exopolysaccharida structure.

Nakatsu CH, NA Straus, RC Wyndham (1995) The nucleotide sequence of the Tn 5271 3-chlorobenzoate 3,4-dioxygenase genes (cbaAB) unites the class lA oxygenases in a single linkage Microbiology (UK) 141 485-595. 

There is a wide variety of hierarchical algorithms available and it is impossible to discuss all of them here. Therefore, we shall only explain the most typical ones, namely the single linkage, the complete linkage and the average linkage methods. 

Fig. 30.7. Dendrograms for the data of Tables 30.3-30.7 (a) average linkage (b) single linkage (c) complete linkage.

Successive reduced matrices for the data of Table 30.4 obtained by single linkage... 

Single linkage methods have a tendency to chain together ill-defined clusters (see Fig. 30.8). This eventually leads to include rather different subjects (A to X of Fig. 30.8) into the same long drawn-out cluster. For that reason one sometimes... 

Fig. 30.8. Dissimilar objects A and X are chained together in a cluster obtained by single linkage.

There exist several methods of hierarchical clustering which use diverse measures of distance or similarity, respectively, e.g., single linkage, complete linkage, average linkage, centroid linkage, and Ward s method (Sharaf et al. [1986], Massart et al. [1988], Otto [1998] Danzer et al. [2001]). 

Compute the distances between all clusters using complete linkage, single linkage, average linkage, or other methods. 

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