TWO COLOR MUTATIONS OF RATS WHICH SHOW PARTIAL COUPLING.
TWO COLOR MUTATIONS OF RATS WHICH SHOW PARTIAL COUPLING.
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显示部分耦合的大鼠的两种颜色突变。
DOI:
10.1126/science.42.1075.193
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发表时间:
1915
期刊:
影响因子:
56.9
通讯作者:
S. Wright
中科院分区:
文献类型:
--
作者:
W. Castle;S. Wright
marked. One speaker in particular, as the result of several hearings, in the first half-year was rated at 10 per cent., in the second at 76 per cent. Of the different speakers, six were heard in both of the semesters, and are thus more directly comparable than the others. Their average for the first semester was 64 per cent., for the second, 92 per cent., that is, while during the first semester more than one word out of every three was unintelligible, only about one in twelve was unheard in the second. The effect was even more striking in seat V. Before the treatment of the chapel the average audibility was 71 per cent., exactly the same as at the greater distance, showing that the advantage gained by a somewhat nearer approach to the speaker was completely nullified by the disturbances from reverberation. The attention, as in the seat AA, was careful or strained. After the treatment the average audibility rose to nearly 96 per cent., nearly perfect hearing, and the attention in most cases was noted as easy. I n seat Q, about fifty-five feet from the speaker, the audibility rose from an average of 95 per cent. in the first semester to 100 per cent. in each separate case in the second. The results are summarized below for more easy comparison.