Voronezh State University

About: Voronezh State University is a education organization based out in Voronezh, Russia. It is known for research contribution in the topics: Silicon & Boundary value problem. The organization has 5166 authors who have published 6097 publications receiving 31680 citations. The organization is also known as: VSU & Voronezh University.

Circular dichroism from unpolarized atoms in multiphoton multicolor ionization

Abstract: The angular distribution of the photoelectrons produced from a ground-state atom ionized under the combined action of two (or several) radiation fields can exhibit circular dichroism effects, when reversing the polarization state (right versus left, for instance) of one of the fields. We address the question of such dichroic effects in a currently explored scenario in which the atom is ionized in the presence of a strong laser field and of one (or several) of its higher harmonics.

Cockroaches probably cleaned up after dinosaurs.

Abstract: Dinosaurs undoubtedly produced huge quantities of excrements. But who cleaned up after them? Dung beetles and flies with rapid development were rare during most of the Mesozoic. Candidates for these duties are extinct cockroaches (Blattulidae), whose temporal range is associated with herbivorous dinosaurs. An opportunity to test this hypothesis arises from coprolites to some extent extruded from an immature cockroach preserved in the amber of Lebanon, studied using synchrotron X-ray microtomography. 1.06% of their volume is filled by particles of wood with smooth edges, in which size distribution directly supports their external pre-digestion. Because fungal pre-processing can be excluded based on the presence of large particles (combined with small total amount of wood) and absence of damages on wood, the likely source of wood are herbivore feces. Smaller particles were broken down biochemically in the cockroach hind gut, which indicates that the recent lignin-decomposing termite and cockroach endosymbionts might have been transferred to the cockroach gut upon feeding on dinosaur feces.

Comparative Morphology of Trunk and Sacral Vertebrae of Tailed Amphibians of Russia and Adjacent Countries

Abstract: Trunk and sacral vertebrae of three species of the family Hynobiidae ( Onychodactylus fischeri , Ranodon sibiricus , and Salamandrella keyserlingii ) and nine species of the family Salamandridae ( Lissotriton montandoni , Lissotriton vulgaris , Mertensiella caucasica , Mesotriton alpestris , Ommatotriton ophryticus , Salamandra salamandra , Triturus cristatus , Triturus dobrogicus , and Triturus karelinii ) were studied. Analysis of individual variation of vertebrae of these species along the axial column and systematic descriptions of these species are given. Our comparative analysis revealed that all species studied have peculiarities which allow diagnosing them. Geographic variation in height of neurapophysis was found in Triturus karelinii . Specimens of the species from the Crimea and the Balkans have low neurapophyses, and newts from eastern Georgia and Dagestan are characterized by high ones.