To make chitosan having PH sensitivity, in this paper chitosan was grafted by sulfadimethoxypyrimidine (SDM) which is a pH sensitivity group.

为了制备具有pH敏感性能的壳聚糖，本文采用将磺胺二甲氧基嘧啶（SDM）作为pH敏感基团接枝到壳聚糖上。

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Editorial writer Rapheal Reece-Harrel(ph) has used his column in the free paper Metro to exhort Mexicans to participate in response to widespread marches in the United States.

NPR: Immigration Activists Target U.S. Businesses in Mexico

Mr. ROLAND MARTIN (Executive Editor, Chicago Defender): Well, I mean, first of all, John Shinstack(ph), when he died, left the paper to the trust and--for them to do as they so wished.

NPR: Roundtable: Voting Rights Act, NABJ Conference