scholarly journals Developmental Biology among Corbiculate Bees: Bombus impatiens, Including Observations on Its Egg Eclosion

2018 ◽  
Vol 2018 (3912) ◽  
pp. 1 ◽  
Author(s):  
Jerome G. Rozen ◽  
Corey Shepard Smith ◽  
Sarah Kocher ◽  
Eli S. Wyman
Keyword(s):  
Developmental Biology ◽  
Bombus Impatiens ◽  
Corbiculate Bees

scholarly journals Ubx promotes corbicular development in Apis mellifera

2014 ◽  
Vol 10 (1) ◽  
pp. 20131021 ◽  
Author(s):  
Victor Medved ◽  
Zachary Y. Huang ◽  
Aleksandar Popadić
Keyword(s):  
Apis Mellifera ◽  
Morphological Feature ◽  
Bombus Impatiens ◽  
Corbiculate Bees ◽  
Orderly Arrangement

The key morphological feature that distinguishes corbiculate bees from other members of the Apidae family is the presence of the corbicula (pollen basket) on the tibial segment of hind legs. Here, we show that in the honeybee ( Apis mellifera ), the depletion of the gene Ultrabithorax ( Ubx ) by RNAi transforms the corbicula from a smooth, bristle-free concave structure to one covered with bristles. This is accompanied by a reduction of the pollen press, which is located on the basitarsus and used for packing the pollen pellet as well as a loss of the orderly arrangement of the rows of bristles that form the pollen comb. All these changes make the overall identity of workers’ T3 legs assume that of the queen. Furthermore, in a corbiculate bee of a different genus, Bombus impatiens , Ubx expression is also localized in T3 tibia and basitarsus. These observations suggest that the evolution of the pollen gathering apparatus in corbiculate bees may have a shared origin and could be traced to the acquisition of novel functions by Ubx , which in Apis were instrumental for subsequent castes and behavioural differentiation.

The 1-MeV Electron Microscope Installation at the University of Colorado

1973 ◽  
Vol 31 ◽  
pp. 8-9 ◽  
Author(s):  
Mircea Fotino
Keyword(s):  
Electron Microscopy ◽  
Developmental Biology ◽  
Transmission Electron Microscopy ◽  
Electron Microscope ◽  
National Institutes Of Health ◽  
Experimental Program ◽  
University Of Colorado ◽  
Transmission Electron ◽  
The University ◽  
Research Resources

A new 1-MeV transmission electron microscope (Model JEM-1000) was installed at the Department of Molecular, Cellular and Developmental Biology of the University of Colorado in Boulder during the summer and fall of 1972 under the sponsorship of the Division of Research Resources of the National Institutes of Health. The installation was completed in October, 1972. It is installed primarily for the study of biological materials without many of the limitations hitherto unavoidable in standard transmission electron microscopy. Only the technical characteristics of the installation are briefly reviewed here. A more detailed discussion of the experimental program under way is being published elsewhere.

Developmental Biology Meets Ecology

2009 ◽  
Vol 138 (3) ◽  
pp. 421-422
Author(s):  
Antónia Monteiro
Keyword(s):  
Developmental Biology

The hydroid research of American naturalist Samuel F. Clarke, 1851–1928

1997 ◽  
Vol 24 (1) ◽  
pp. 19-36 ◽  
Author(s):  
DALE R. CALDER ◽  
LESTER D. STEPHENS
Keyword(s):  
Developmental Biology ◽  
Taxonomic Status ◽  
Doctoral Dissertation ◽  
Nominal Species ◽  
Marine Biological Laboratory ◽  
Spotted Salamander ◽  
Johns Hopkins University ◽  
American Naturalist ◽  
American Schools ◽  
American Society

Samuel Fessenden Clarke was the leading specialist on hydroids (phylum Cnidaria) in North America over the last quarter of the nineteenth century. During that period he published taxonomic papers on hydroids from both the Atlantic and Pacific coasts of the continent, from the Gulf of Mexico, and from the eastern Pacific off Central and South America. He also authored a section on hydrozoan biology for “The Riverside Natural History” series. Most of his papers on hydroids were published while he was in his twenties. Clarke described as new 61 nominal species, three nominal genera, and one nominal family, as well as two “varieties” of hydroids. A list of these, and their current taxonomic status, appears in the present work. Clarke consistently provided sound descriptions and locality data for all supposed new species, and drew accurate illustrations of most of them. His research on Hydrozoa, beyond alphataxonomy, was directed towards faunal distributions and the use of hydroid assemblages as biogeographic indicators. In addition to investigations on hydroids, Clarke carried out research on the developmental biology of amphibians and reptiles. His doctoral dissertation at Johns Hopkins University was based on the embryology of the “Spotted Salamander” (=Yellow-spotted Salamander), and he published a major paper on the habits and embryology of the American Alligator. Most of Clarke's career was devoted to academic duties at Williams College, Massachusetts, where he was recognized as a dedicated and inspiring teacher. He served the American Society of Naturalists in various capacities, including a term as its president, was an influential trustee of the Marine Biological Laboratory, Woods Hole, and promoted the study of science in American schools.

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