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The list presented here is a checklist of global bumblebee [1] species (Tribe Bombini) based on the Bombus phylogeny presented by Cameron et al (2007) [2] and grouped by subgenus following the revision of Williams et al (2008). [3]
Alan Kostelecký and Stuart Samuel showed in 1989 that mechanisms arising in the context of string theory can lead to spontaneous breaking of Lorentz symmetry. [6] [7] A set of models at the level of effective field theory were defined that contained gravitational fields and a vector field B μ that has a nonzero vacuum expectation value, <B μ > = b μ.
The special fragrance collection organs are seen on the large hind legs of this Euglossa viridissima as it sleeps on a leaf. Male orchid bees have uniquely modified legs which are used to collect and store different volatile compounds (often esters) throughout their lives, primarily from orchids in the subtribes Stanhopeinae and Catasetinae, where all species are exclusively pollinated by ...
This is a list of crop plants pollinated by bees along with how much crop yield is improved by bee pollination. [1] Most of them are pollinated in whole or part by honey bees and by the crop's natural pollinators such as bumblebees, orchard bees, squash bees, and solitary bees. Where the same plants have non-bee pollinators such as birds or ...
The photon having non-zero linear momentum, one could imagine that it has a non-vanishing rest mass m 0, which is its mass at zero speed. However, we will now show that this is not the case: m 0 = 0. Since the photon propagates with the speed of light, special relativity is called for. The relativistic expressions for energy and momentum ...
A field guide is a book designed to help the reader identify wildlife (flora or fauna or funga) or other objects of natural occurrence (e.g. rocks and minerals). It is generally designed to be brought into the " field " or local area where such objects exist to help distinguish between similar objects. [ 1 ]
PFG 1: A Field Guide to the Birds (1934), by Roger Tory Peterson . Second edition (1939): A Field Guide to the Birds Third edition (1947): A Field Guide to the Birds Fourth edition (1980): A Field Guide to the Birds: A Completely New Guide to All the Birds of Eastern and Central North America
Bombus sonorus, commonly known as the Sonoran bumble bee, is a species of bumble bee in the family Apidae.It is found in Mexico and southwestern North America. [1] [2] [3] Although it has often been categorized as a subspecies of Bombus pensylvanicus, [4] it is has since been shown to not hybridize with B. pensylvanicus over a broad area of geographic overlap, confirming its status as a ...