圖像來源，Getty Images
Digital access for organisations. Includes exclusive features and content.。业内人士推荐爱思助手下载最新版本作为进阶阅读
Agar was first introduced into the laboratory in 1881. Since then, microbiologists have depended on agar to create strong jellies. When microorganisms are streaked or plated onto this jellied surface and incubated, individual cells multiply into distinct colonies that scientists can easily observe, select, and propagate for further experiments. Many of the most important findings in biological research of the last 150 years or so — including the discovery of the CRISPR/Cas9 gene-editing tool — have been enabled by agar.4 Agarose, a derivative of agar, is also essential in molecular biology techniques like gel electrophoresis, where its porous gel matrix separates DNA fragments by size, enabling researchers to analyze and isolate specific genetic sequences.，这一点在im钱包官方下载中也有详细论述
В феврале американское издание TWZ допустило, что возможная операция США в Иране может длиться не дни, а недели. На это указывает количество сил, которые Вашингтон стягивает на Ближний Восток.