CVI.—The yellow colouring principles of various tannin matters

The comparison of various club guessing principles

Investigation of Tannin content in Diospyros mespiliformis Extract using Various Extraction Solvents

Plants produce many bioactive compounds that are called secondary metabolites, and have a wide variation in chemical diversity, distribution and function [1]. Phytochemistry of plants has revealed the pharmacological effect and their uses in industries [2-4]. Secondary metabolites have long been known as a source of effective medical therapies such as anti-bacterial and anti-cancer as reported ...

Investigation of Tannin content in Diospyros mespiliformis Extract using Various Extraction Solvents

Plants produce many bioactive compounds that are called secondary metabolites, and have a wide variation in chemical diversity, distribution and function [1]. Phytochemistry of plants has revealed the pharmacological effect and their uses in industries [2-4]. Secondary metabolites have long been known as a source of effective medical therapies such as anti-bacterial and anti-cancer as reported ...

Colouring graphs with bounded generalized colouring number

Given a graph G and a positive integer p, χp(G) is the minimum number of colours needed to colour the vertices of G so that for any i ≤ p, any subgraph H of G of tree-depth i gets at least i colours. This paper proves an upper bound for χp(G) in terms of the k-colouring number colk(G) of G for k = 2p−2. Conversely, for each integer k, we also prove an upper bound for colk(G) in terms of χk+2(G)...

Edge-colouring and total-colouring chordless graphs

A graph G is chordless if no cycle in G has a chord. In the present work we investigate the chromatic index and total chromatic number of chordless graphs. We describe a known decomposition result for chordless graphs and use it to establish that every chordless graph of maximum degree ∆ ≥ 3 has chromatic index ∆ and total chromatic number ∆+1. The proofs are algorithmic in the sense that we ac...