Comments on E. G. West and R. J. Staaf

Antibacterial activity of alkyl gallates and related compounds against Ralstonia solanacearum

“…11) Two cases have reported their structure-activity relationship against Gram-negative bacteria; antibacterial activity against Escherichia coli increases as the carbon number increases in the range of C1-C5 esters (n-amylϾiso-amylϾn-butylϾiso-butylϾn-propylϾiso-propylϾ ethylϾmethyl ester), and the activity of gallic acid is comparable to that of methyl gallate. 12) In Salmonella choleraesuis, nonyl and octyl gallate are the most effective, an increase or decrease in the carbon number of the ester reduces the activity, and propyl gallate and gallic acid are inactive. 13) A similar parabolic function of lipophilicity and antimicrobial activity is observed in Gram-positive bacteria and fungi.…”

“…Various mechanisms of action have been suggested for the antibacterial activity of gallate esters, such as membrane disruption 12) or inhibition of respiration; 11,14) however, the conclusions are still unclear. The structure-activity relationship of gallates and parabens in R. solanacearum is different from their relationship in other bacteria, suggesting that the mechanism of action may differ and be specific to R. solanacearum.…”

Synthesis and characterization of polystyrene‐supported glucosamine resin and its adsorption behavior for Au(III)

“…Both the linear relationship between Ϫln(1 Ϫ Q/Q 0 ) and t shown in Figure 2 and R 2 Ͼ 0.95 shown in Table I indicated that the adsorption process of PS-GA for Au(III) could be approximatively described by G. E. Boyd equation, meaning that this adsorption may obey the mechanism of liquid film diffusion control. 16 From Table I, it could be seen that the k values increase with increase of temperature on the whole, indicating that the adsorption could proceed more easily at higher temperature. This result agreed with that of the aforementioned adsorption kinetics experiments.…”

Synthesis of polystyrene‐supported glucosamine resin and its adsorption properties for metal ions

“…The excellent linear relationship between Ϫln[1 Ϫ (Q/Q 0 )] and t (R 2 Ͼ 0.91 as shown in , and Hg 2ϩ can be precisely described by the Boyd equation, meaning that the adsorptions obey the mechanism of liquid film diffusion control. 10 According to the Arrhenius equation, ln k ϭ ϪE a /RT ϩ ln A, where k is the constant of adsorption. Figure 9 shows the results of plotting ln k against 1/T.…”