966 resultados para Mary, Queen of Scots, 1542-1587
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Intraspecific variation in social organization is common, yet the underlying causes are rarely known. An exception is the fire ant Solenopsis invicta in which the existence of two distinct forms of social colony organization is under the control of the two variants of a pair of social chromosomes, SB and Sb. Colonies containing exclusively SB/SB workers accept only one single queen and she must be SB/SB. By contrast, when colonies contain more than 10% of SB/Sb workers, they accept several queens but only SB/Sb queens. The variants of the social chromosome are associated with several additional important phenotypic differences, including the size, fecundity and dispersal strategies of queens, aggressiveness of workers, and sperm count in males. However, little is known about whether social chromosome variants affect fitness in other life stages. Here, we perform experiments to determine whether differential selection occurs during development and in adult workers. We find evidence that the Sb variant of the social chromosome increases the likelihood of female brood to develop into queens and that adult SB/Sb workers, the workers that cull SB/SB queens, are overrepresented in comparison to SB/SB workers. This demonstrates that supergenes such as the social chromosome can have complex effects on phenotypes at various stages of development.
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Description based on: 16th ed. (1901).
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Description based on: 16th ed. (1901).
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Description based on: 16th ed. (1901).
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Description based on: 16th ed. (1901).
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Description based on: 16th ed. (1901).
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Description based on: 16th ed. (1901).
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Description based on: 16th ed. (1901).
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An undated black and white studio portrait of Rev. and Mrs. Wright and family presented to Mrs. Mary Bell. The photograph is mounted in a decorative board frame and bears the handwritten inscription "Mrs. Mary Bell from Mrs. and Rev. Wright" on the reverse. This photograph was included in memorabilia owned by the Richard Bell family of St. Catharines, Ontario.
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A cabinet card believed to be of Mary Bell, photographed by F. Pfaff, Artistic Photographer, of Erie, Pennsylvania. A handwritten entry on the reverse of the photo lists the address "231 Duke St.", however, the company's logo identifies its address as 1011 State St., Ground Floor Gallery. This photograph was in the possession of Iris Sloman Bell, of St. Catharines, Ontario. The Sloman - Bell family includes relatives who are former Black slaves from the United States."Cabinet card photographs were first introduced in 1866. They were initially employed for landscapes rather than portraitures. Cabinet cards replaced Carte de visite photographs as the popular mode of photography. Cabinet cards became the standard for photographic portraits in 1870. Cabinet cards experienced their peak in popularity in the 1880's. Cabinet cards were still being produced in the United States until the early 1900's and continued to be produced in Europe even longer. The best way to describe a cabinet card is that it is a thin photograph that is mounted on a card that measures 4 1/4″ by 6 1/2″. Cabinet cards frequently have artistic logos and information on the bottom or the reverse of the card which advertised the photographer or the photography studio's services. " Source: http://cabinetcardgallery.wordpress.com/category/cabinet-card-history/
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Genealogical notes of Cyrus and Mary Sumner, n.d.; includes birth and some death dates of children. Listed are eleven names of children with birth dates and one child's death dated at two months of age.