Triploid intersexes in Drosophila melanogaster
Triploid intersexes in Drosophila melanogaster
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DOI：
10.1126/science.54.1394.252
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发表时间：
1921-07-01
期刊：
影响因子：
56.9
通讯作者：
Bridges, CB
中科院分区：
文献类型：
--
作者：
Bridges, CB
已经从炼焦中获益。我们觉醒的结果显示在新发布的1920年人口普查摘要中。1914年，美国有754家工厂生产化学品，产品价值200,195,800美元。1920年，它有1,374个机构，产品价值694,643,000美元。这些产品的价值在六年内增长了247%。钾盐和钾盐产品的生产量是1914年的两倍多，酸的生产量大约是1914年的2.5倍，苏打和钠的生产量几乎是1914年的三倍，煤焦油产品的生产量为133,340,000美元，而1914年的生产量为8,839,000美元，大约是1914年的15倍。尽管取得了这种进展，但一些基本化学工业的复杂性，以及它们必须与其他工业建立谨慎的调整关系，使我们在安全之前需要更多的进步。对国防至关重要的煤焦油行业的领导人宣称，尽管我们已经远远超过了除德国和瑞士以外的所有其他国家，但我们还需要五年时间才能使我们的地位坚不可摧。就目前而言，我们的许多制药和染料制造公司--去年我们有213家公司生产这些和其他煤焦油产品--有权完成关税保护。哥伦比亚大学的化学家们通过了要求“选择性禁运”的决议。在这一领域的某些领域需要的任何禁运都可以也应该通过明智的关税立法来提供，而不是像一些人要求的那样，通过许可局的武断法令来提供。--《纽约晚报》
have gained from coking. The results of our awakening are shown in thenewly issued summary of the 1920 census. In 1914 the United States had 754 establishments manu-facturing chemicals, with products worth $200,195,800. In 1920 it had 1,374 establish-ments, with products worth $694,643,000. The increase in the value of the products in six years was 247 per cent. The manufacture of potash and potassium products was slightly more than twice as great-measured in value-as in 1914; that of acids about two and a half times as great; that of sodas and sodium almost three times as great, and that of coal tar products was $133,340,000, as against $8,839,000 in 1914, or about fifteen times as great.Gratifying as this progress is, the complex-ity of some essential chemical industries, the careful adjustments they must establish with other industries, render more progress necessary before we are safe. Leaders in the coal-tar business, which are vital to national defence, declare that although we have far surpassed all other nations except Germany and Switzerland, we need five years yetto make our position impregnable. For the time being many of our drug-making and dye-making firms-we had 213 companies making these and other coal-tar products last year-have a right to complete tariff protection. The chemists at Columbia University have adopted resolutions asking for a" selective embargo." Any embargo needed in certain parts of this field can and should be provided by wise tariff legislation, and not, as some demand, by the arbitrary decrees of a licensing bureau.-New York Evening Post.