It’s also worth noting that even if alternatives superior to agar were found, scientists are reluctant to abandon established protocols (even when microbiologists do use other jellies, they often still add agar to the mix, for example, to increase the gel strength of the solid media). As agar has been the standard gelling agent in microbiology for around 150 years, an enormous infrastructure of standardized methods, reference values, and quality control procedures has emerged around its specific properties. Switching to a different medium (even a superior one) means results may not be directly comparable to decades of published literature or to other laboratories’ findings.
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孩子佩戴的手表由小朋友亲戚凑钱共同购头。因父亲健康原因，孩子不时需自行前往外婆家，为在路途中及时与家人联系、保障安全，故购买此手表。大疆相机为同行志愿者个人物品。漫画为志愿者知道孩子心愿后个人购买作为礼物赠与。所有帮扶家庭均经政府与公益机构实地核实，确属住房条件简陋、存在实际改造需求的困境家庭，绝非随意选定。
if (arr[i-1] arr[i]) return 0;