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Agar diffusion was first used by Martinus Beijerinck in 1889 to study the effect of auxins on bacterial growth. However, the method has been developed, refined and standardized by many scientists and scientific organizations over the years including George F. Reddish, Norman Heatley, James G. Vincent, [8] Alfred W. Bauer, William M.M. Kirby, John C. Sherris, [4] [5] Hans Martin Ericsson, the ...
A variety of specific cutoff tests for skin color emerged; the most famous one was the brown paper bag test. [81] If people's skins were darker than the color of a brown paper bag, they were considered "too dark". While the origin of this test is unclear, it is best attested to in 20th-century black culture.
Literacy is the ability to read and write. Some researchers suggest that the study of "literacy" as a concept can be divided into two periods: the period before 1950, when literacy was understood solely as alphabetical literacy (word and letter recognition); and the period after 1950, when literacy slowly began to be considered as a wider concept and process, including the social and cultural ...
Punjab (Punjabi: puñjāba pronounced [pənˈdʒaːb] ⓘ) is a state in northwestern India.Forming part of the larger Punjab region of the Indian subcontinent, the state is bordered by the Indian states of Himachal Pradesh to the north and northeast, Haryana to the south and southeast, and Rajasthan to the southwest; by the Indian union territories of Jammu and Kashmir to the north and ...