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Edited By: MOHAMED A. NOOR, Editor-in-Chief

Impact factor: 3.818
ISI Journal Citation Reports @ Ranking: 2017: 33/158 (Ecology)
ISI Journal Citation Reports @ Ranking: 2017: 16/49 (Evolutionary Biology)
ISI Journal Citation Reports @ Ranking: 2017: 48/171 (Genetics Heredity)
Online ISSN: 1558-5646
© Society for the Study of Evolution
Volume 72, Issue 6
June 2018

published for the Society for the Study of Evolution,is the premier publicationdevoted to the study of organic evolution and the integration of the various fields of science concerned with evolution. The journal presents significant and original results that extend our understanding of evolutionary phenomena and processes.

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The following is a list of the most cited articles based on citations published in the last three years, according to CrossRef.

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1191-1332
June 2018
1017-1190
May 2018
719-1016
April 2018
411-718
March 2018

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will be published in online-only format effective with the 2017 volume. This is a proactive move towards reducing the environmental impact caused by the production and distribution of printed journal copies and will allow the journal to invest in further digital development. Published articles will continue to be disseminated quickly through the journal’s broad network of indexing services, including ISI, MEDLINE and Scopus. Articles will also continue to be discoverable through popular search engines such as Google. All color images will now be reproduced digitally and published free of charge.

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One of the great technical challenges of introducing color broadcast television was the desire to conserve bandwidth , potentially three times that of the existing black-and-white standards, and not use an excessive amount of radio spectrum . In the United States, after considerable research, the National Television Systems Committee [122] approved an all-electronic Compatible color system developed by , which encoded the color information separately from the brightness information and greatly reduced the resolution of the color information in order to conserve bandwidth. The brightness image remained compatible with existing black-and-white television sets at slightly reduced resolution, while color televisions could decode the extra information in the signal and produce a limited-resolution color display. The higher resolution black-and-white and lower resolution color images combine in the brain to produce a seemingly high-resolution color image. The NTSC standard represented a major technical achievement.

Color bars used in a test pattern , sometimes used when no program material is available.

Although all-electronic color was introduced in the U.S. in 1953, [123] high prices, and the scarcity of color programming, greatly slowed its acceptance in the marketplace. The first national color broadcast (the 1954 Tournament of Roses Parade ) occurred on 1 January 1954, but during the following ten years most network broadcasts, and nearly all local programming, continued to be in black-and-white. It was not until the mid-1960s that color sets started selling in large numbers, due in part to the color transition of 1965 in which it was announced that over half of all network prime-time programming would be broadcast in color that fall. The first all-color prime-time season came just one year later. In 1972, the last holdout among daytime network programs converted to color, resulting in the first completely all-color network season.

Early color sets were either floor-standing console models or tabletop versions nearly as bulky and heavy; so in practice they remained firmly anchored in one place. The introduction of 's relatively compact and lightweight Stacy Adams Sedgwick Cap Toe Oxford DqjzNi
set in the spring of 1966 made watching color television a more flexible and convenient proposition. In 1972, sales of color sets finally surpassed sales of black-and-white sets. Color broadcasting in Europe was not standardized on the format until the 1960s, and broadcasts did not start until 1967. By this point many of the technical problems in the early sets had been worked out, and the spread of color sets in Europe was fairly rapid. By the mid-1970s, the only stations broadcasting in black-and-white were a few high-numbered UHF stations in small markets, and a handful of low-power repeater stations in even smaller markets such as vacation spots. By 1979, even the last of these had converted to color and, by the early 1980s, BW sets had been pushed into niche markets, notably low-power uses, small portable sets, or for use as video monitor screens in lower-cost consumer equipment. By the late 1980s even these areas switched to color sets.

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