Ruzanna Petrosyan

Polyploidy in germ cell of brown bear Ursus arctos (Ursidae, Mammalia): A case report

Lianna Virabyan, Ruzanna Petrosyan, Irina Ayvazyan, Emma Rose Khachatrian et autres

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Variation and Morphological Manifestation of Germline-Restricted Chromosomes in Three Species of Leaf Warblers of Genus Phylloscopus

Irina Ayvazyan, Ruzanna Petrosyan, Emma Rose Khachatrian, Lianna Virabyan et autres

INTRODUCTION: Germline restricted chromosomes are considered a rather ancient element in the genomes of passerine birds. Obviously, detailed comparative studies on model groups including closely related species are required for a better understanding of GRC evolution. It is especially interesting if GRCs …

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THE CORRELATIOAN OF DEFENSE MECHANISMS AND SELF-ESTEEM AT DIFFERENT AGE GROUPS

Ruzanna Zhamkotsyan, Ruzanna Petrosyan

The article presents the applicability of psychological defense mechanisms in different age groups of personality development, the levels of self-esteem development and correlations between individual psychological defense mechanisms and self-esteem. The data obtained show the frequency of use of psychological defense mechanisms, …

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Premeiotic endoreplication is the mechanism of obligate parthenogenesis in rock lizards of the genus Darevskia

Dmitrij Dedukh, Marie Altmanová, Ruzanna Petrosyan, Marine Arakelyan et autres

Among vertebrates, obligate parthenogenesis occurs exclusively in squamate reptiles. Premeiotic endoreplication in a small subset of developing oocytes has been documented as the mechanism of production of unreduced eggs in minutely explored obligate parthenogenetic lineages, namely in teiids and geckos. The situation …

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Author response for "Premeiotic endoreplication is the mechanism of obligate parthenogenesis in rock lizards of the genus Darevskia"

Marie Altmanová, Ruzanna Petrosyan, Marine Arakelyan, EDUARD A. GALOYAN et autres

Premeiotic endoreplication is the mechanism of obligate parthenogenesis in rock lizards of the genus Darevskia

Dmitrij Dedukh, Marie Altmanová, Ruzanna Petrosyan, Marine Arakelyan et autres

Abstract Among vertebrates, obligate parthenogenesis occurs exclusively in squamate reptiles. Premeiotic endoreplication in a small subset of developing oocytes has been documented as the mechanism of production of unreduced eggs in minutely explored obligate parthenogenetic lineages, namely in teiids and geckos. The …

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MOTIVATION FOR SUCCESS AT A YOUNG AND MATURE AGE

Ruzanna Petrosyan, Hakob Gevorgyan

The article discusses the peculiarities of the aspirations of young and mature people to success, the peculiarities of reflecting and manifesting success as a multifaceted phenomenon, combined and identified in literature and research, in various spheres of life. Considering that professional activity …

Status of the Dwarf Lizard (Parvilacerta parva) at the edge of its range in Armenia

Marine Arakelyan, Tigran Tadevosyan, Ruzanna Petrosyan, Tigran Ghrejyan et autres

Studying the geographic distribution of the Dwarf Lizard (Parvilacerta parva) at the north-eastern edge of its geographic range in Armenia, we compiled a list of 31 locations in six regions (marzes) of northern and central Armenia. Three occurrences remain unconfirmed, and we …

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Peculiarities of Thermal Biology in Two Parthenogenetic Rock Lizard Species, Darevskia armeniaca and Darevskia unisexualis, and One Bisexual Species, Darevskia valentini (Lacertidae, Squamata)

Oleg Nikolaev, D. A. Belova, B. A. Novikov, I. B. Simis et autres

Abstract Some aspects of thermal biology were considered in three species of the lizard genus Darevskia: the parthenogenetic Darevskia armeniaca and D. unisexualis, and their parental bisexual species Darevskia valentini. The main objective of the present research was to compare the thermal …

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Genetic Variability and the Potential Range of Darevskia rostombekowi in Transcaucasia

Fedor A. Osipov, Andrey A. Vergun, Marine Arakelyan, Ruzanna Petrosyan et autres

Abstract — The results of the analysis of the genetic variability of parthenogenetic Darevskia rostombekowi (Darevsky, 1957) species using four microsatellite-containing loci are presented. Based on 118 records with geographical coordinates of the presence of this species in Transcaucasia, the maps of …

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Rediscovery of Chernov's skink ( Ablepharus chernovi ) in Armenia

Marine Arakelyan, Vasil Ananian, Ruzanna Petrosyan

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Extraordinary centromeres: differences in the meiotic chromosomes of two rock lizards speciesDarevskia portschinskiiandDarevskia raddei

Victor E. Spangenberg, Marine Arakelyan, EDUARD A. GALOYAN, Mark Pankin et autres

According to the synthesis of 30 years of multidisciplinary studies, parthenogenetic species of rock lizards of genusDarevskiawere formed as a result of different combination patterns of interspecific hybridization of the four bisexual parental species:Darevskia raddei,D. mixta,D. valentini, andD. portschinskii. In particular,D. portschinskiiandD. …

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