575 results match your criteria: "Universitetskaya emb[Affiliation]"

Gallophilous theory of cyclical parthenogenesis in aphids (Homoptera, Aphidinea).

Comp Cytogenet

December 2024

Zoological Institute of the Russian Academy of Sciences, Universitetskaya Emb. 1, Saint Petersburg, 199034, Russia Zoological Institute of the Russian Academy of Sciences Saint Petersburg Russia.

The paper elaborates theoretical basis of the origin of aphid cyclical parthenogenesis in view of the original life of these insects in strobiloid galls on spp. The period of gall opening is greatly extended in time, which prevents normal panmixia and creates a selective advantage for parthenogenetic reproduction. Migration of aphids to secondary host plants, on which closed galls never form, parthenogenetic reproduction on these plants, and the subsequent simultaneous return of "remigrants" to the main host plant make it possible to synchronize the development of the bisexual generation and achieve mass panmixia at the end of the life cycle only; it coincides with the end of summer growth shoots or the autumn end of the vegetation period as a whole.

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The family Hippoboscidae, commonly known as "louse flies," comprises pupiparous Diptera that are ectoparasites of birds and mammals, with significant impacts on their hosts and epidemiological importance. The louse fly fauna of Vietnam is relatively understudied compared to other countries in the Southeast Asia region. In this study, we describe a new species of the genus Speiser, 1905 (Diptera: Hippoboscidae), , collected from the lesser coucal (Gmelin, JF, 1788) in Cat Tien National Park, Vietnam.

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Amyloid Fibrils of the s36 Protein Modulate the Morphogenesis of Eggshell.

Int J Mol Sci

November 2024

St. Petersburg Branch, Vavilov Institute of General Genetics, Russian Academy of Sciences, Universitetskaya Emb. 7/9, 199034 St. Petersburg, Russia.

is the oldest classic model object in developmental genetics. It may seem that various structures of the fruit fly at all developmental stages have been well studied and described. However, recently we have shown that some specialized structures of the eggshell contain an amyloid fibril network.

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Transition metal dichalcogenides (TMDCs), particularly molybdenum disulfide (MoS), have gained significant attention in the field of optoelectronics and photonics due to their unique electronic and optical properties. The integration of TMDCs with plasmonic materials allows to tailor the optical response and offers significant advantages for photonic applications. This study presents a novel approach to synthesize MoS-Au nanocomposites utilizing femtosecond laser ablation in liquid to achieve tunable optical properties in the near-infrared (NIR) region.

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Lead Catalyzed GaAs Nanowires Grown by Molecular Beam Epitaxy.

Nanomaterials (Basel)

November 2024

Faculty of Physics, St. Petersburg State University, Universitetskaya Emb. 13B, 199034 St. Petersburg, Russia.

This study investigates the growth of gallium arsenide nanowires, using lead as a catalyst. Typically, nanowires are grown through the vapor-solid-liquid mechanism, where a key factor is the reduction in the nucleation barrier beneath the catalyst droplet. Arsenic exhibits limited solubility in conventional catalysts; however, this research explores an alternative scenario in which lead serves as a solvent for arsenic, while gallium and lead are immiscible liquids.

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Time-resolved fluorescence of ANS dye as a sensor of proteins LLPS.

Biochem Biophys Res Commun

January 2025

Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology, Russian Academy of Sciences, 4 Tikhoretsky Ave., 194064, St. Petersburg, Russia. Electronic address:

The explosive growth in the number of works addressing the phase separation of intrinsically disordered proteins has driven both the development of new approaches and the optimization of existing methods for biomolecular condensate visualization. In this work, we studied the potential use of the fluorescent dye ANS as a sensor for liquid-liquid phase separation (LLPS), focusing on visualizing condensates formed by the stress-granules scaffold protein G3BP1. Using fluorescence lifetime imaging microscopy (FLIM), we demonstrated that ANS can accumulate in RNA-induced G3BP1 condensates in aqueous solutions, but not in G3BP1 condensates formed under macromolecular crowding conditions in highly concentrated PEG solutions.

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The caliscelid genus, Chirodisca Emeljanov, 1996 (Caliscelinae, Caliscelini), is reviewed. Adults and 5th instar nymph of Chirodisca astyages (Dlabola, 1982) and adults of Ch. eximia (Stål, 1859) are described and illustrated on the basis of type specimens and other material examined.

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Orthopteran surveys were recently conducted at the Panti Forest Reserve in Johor State of Peninsular Malaysia. Based on new material, three species new to science are described here: Agryllus sori Tan, Muhammad & Gorochov, sp. nov.

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New species of little-known crickets from the subfamily Pteroplistinae (Orthoptera, Grylloidea) from Sabah and contribution to their bioacoustics.

Zootaxa

September 2024

Institut de Systématique; Evolution; Biodiversité (ISYEB); Muséum national d'Histoire naturelle; CNRS; SU; EPHE-PSL; UA; 57 rue Cuvier; CP 50; 75231 Paris Cedex 05; France.

Recent fieldwork in eastern Sabah led to the discovery of new little-known crickets from the subfamily Pteroplistinae (Orthoptera, Grylloidea). Three new species are described: Tembelingiola biaculeata sp. nov.

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A revision of the chigger mite collection in the KwaZulu-Natal Museum (NM, Pietermaritzburg, South Africa) resulted in finding holotypes or paratypes for 15 of the 51 species described by R.F. Lawrence in 1948-1951 and originally deposited in this museum.

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Three species belonging to the family Cosmopterigidae are treated: Anatrachyntis koreana sp. nov. is described as new to science, Anatrachyntis ptilodelta (Meyrick, 1922) and Macrobathra nomaea Meyrick, 1914 are reported for the first time in Korea.

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Article Synopsis
  • Twenty species of Eupholidoptera, a type of cricket, are identified in southwestern Turkey.
  • A new species named Eupholidoptera abscondita is introduced, while existing names are clarified, confirming synonyms for two other species.
  • The study compares twenty-one species from Turkey and the Middle East using images of their female subgenital plates for further identification.
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Article Synopsis
  • The genus Cottus, part of the Cottidae family, consists of 72 species, with 37 in North America, 17 in Asia, and 18 in Europe.
  • Over the last 18 years, nine new species were identified in Western and Central Europe, including the newly described Cottus dorofeevi found in the Western Dvina/Daugava River system.
  • Cottus dorofeevi exhibits unique morphological traits like a flattened head and long pelvic fins, and its genetic makeup shows distinct differences from other European Cottus species.
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The paper provides a detailed morphological description of a previously unknown female of Supella eocenica Anisyutkin et Perkovsky, 2023. The structure of the tegmina and wings of the type species of the genus Supella, S. longipalpa (Fabricius, 1798), is also redescribed.

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The nogodinid genus Goniopsara Metcalf, 1952 is revised. The type species of the genus, Goniopsara mystica (Melichar, 1899), is redescribed and illustrated along with male genitalia structure is examined and described for the first time. A new species, Goniopsara ridens sp.

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A new alpine autumnal species of the genus Pediasia Hübner, 1825 (Lepidoptera: Crambidae) from Kyrgyzstan.

Zootaxa

November 2024

Russian Entomological Society; Nzhny Novgorod Branch; P.O. Box 97; Nizhny Novgorod 603009; Russia.

A new species, Pediasia gorbunovi sp. nov., is described from Kyrgyzstan, Baidulu Mountains, at Dolon Pass (41°52'40"N, 75°42'11"E, 2790 m altitude).

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Recent Advances in the Growth and Compositional Modelling of III-V Nanowire Heterostructures.

Nanomaterials (Basel)

November 2024

Faculty of Physics, St. Petersburg State University, Universitetskaya Emb. 13B, 199034 St. Petersburg, Russia.

Article Synopsis
  • - Nanowire heterostructures enhance the integration of III-V photonics with silicon electronics, allowing for precise bandgap engineering and improved optical properties.
  • - Recent advancements in modeling these structures focus on deterministic approaches based on classical nucleation and growth theories, helping to understand the formation mechanisms and interfacial profiles.
  • - A variety of models exist for predicting heterostructure behavior, each with unique parameters and limitations, and there is a need for further research to refine these methods and enhance their applicability to experimental data.
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