scholarly journals Comparative study of trophic guilds of free living nematodes inhabiting Rosetta Estuary and Eastern Harbor, Alexandria, Egypt

2008 ◽  
Vol 12 (1) ◽  
pp. 117-142
Keyword(s):  
Comparative Study ◽  
Trophic Guilds ◽  
Free Living

scholarly journals Estimating physical activity and sedentary behaviour in a free-living environment: A comparative study between Fitbit Charge 2 and Actigraph GT3X

PLoS ONE ◽  
2020 ◽  
Vol 15 (6) ◽  
pp. e0234426
Author(s):  
Marie-Louise K. Mikkelsen ◽  
Gabriele Berg-Beckhoff ◽  
Peder Frederiksen ◽  
Graham Horgan ◽  
Ruairi O’Driscoll ◽  
...  
Keyword(s):  
Physical Activity ◽  
Comparative Study ◽  
Sedentary Behaviour ◽  
Living Environment ◽  
Free Living

scholarly journals Extraordinary flight performance of the smallest beetles

2020 ◽  
Vol 117 (40) ◽  
pp. 24643-24645 ◽  
Author(s):  
Sergey E. Farisenkov ◽  
Nadejda A. Lapina ◽  
Pyotr N. Petrov ◽  
Alexey A. Polilov
Keyword(s):  
Body Size ◽  
Comparative Study ◽  
Reynolds Numbers ◽  
Flight Performance ◽  
Free Living ◽  
Low Reynolds Numbers ◽  
Horizontal Acceleration ◽  
Order Of Magnitude ◽  
Basic Biology ◽  
Wing Structure

Size is a key to locomotion. In insects, miniaturization leads to fundamental changes in wing structure and kinematics, making the study of flight in the smallest species important for basic biology and physics, and, potentially, for applied disciplines. However, the flight efficiency of miniature insects has never been studied, and their speed and maneuverability have remained unknown. We report a comparative study of speeds and accelerations in the smallest free-living insects, featherwing beetles (Coleoptera: Ptiliidae), and in larger representatives of related groups of Staphylinoidea. Our results show that the average and maximum flight speeds of larger ptiliids are extraordinarily high and comparable to those of staphylinids that have bodies 3 times as long. This is one of the few known exceptions to the “Great Flight Diagram,” according to which the flight speed of smaller organisms is generally lower than that of larger ones. The horizontal acceleration values recorded in Ptiliidae are almost twice as high as even in Silphidae, which are more than an order of magnitude larger. High absolute and record-breaking relative flight characteristics suggest that the unique morphology and kinematics of the ptiliid wings are effective adaptations to flight at low Reynolds numbers. These results are important for understanding the evolution of body size and flight in insects and pose a challenge to designers of miniature biomorphic aircraft.

scholarly journals A Comparative Study of Phase States of the Peribacteroid Membrane from Yellow Lupin and Broad Bean Nodules

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Natalia N. Kudryavtseva ◽  
Alexis V. Sof’in ◽  
Georgiy S. Bobylev ◽  
Evgeny M. Sorokin
Keyword(s):  
Comparative Study ◽  
Outer Membrane ◽  
Lipid Bilayer ◽  
Rhizobium Leguminosarum ◽  
Broad Bean ◽  
Lupinus Luteus ◽  
Bilayer Structure ◽  
Peribacteroid Membrane ◽  
Free Living ◽  
Yellow Lupin

A comparative study of the lipid bilayer phase status and structure of the outer membrane of free-livingBradyrhizobiumstrain 359a (Nod+Fix+) and 400 (Nod+FixL) orRhizobium leguminosarum97 (Nod+Fix+, effective) and 87 (Nod+FixL, ineffective) has been carried out. Also, the effect of the symbiotic pair combination on the lipid bilayer structure of the bacteroid outer membrane and peribacteroid membrane, isolated from the nodules ofLupinus luteusL. orVicia fabaL., has been studied. As a result, it is shown that the lipid bilayer status of the bacteroid outer membrane is mainly determined by microsymbiont, but not the host plant. In the contrast, the lipid bilayer status of the peribacteroid membrane and, as a consequence, its properties depend on interaction of both symbiotic partners.

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