73 results match your criteria: "⊥Photochemistry Center RAS[Affiliation]"

Nanotechnology has emerged as a revolutionary domain with diverse applications in medicine, and one of the noteworthy developments is the exploration of bacterial magnetosomes acquired from magnetotactic bacteria (MTB) for therapeutic purposes. The demand for natural nanomaterials in the biomedical field is continuously increasing due to their biocompatibility and eco-friendly nature. MTB produces uniform, well-ordered magnetic nanoparticles inside the magnetosomes, drawing attention due to their unique and remarkable features.

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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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Pioneering heat transfer enhancements in latent thermal energy storage: Passive and active strategies unveiled.

Heliyon

October 2024

Marwadi University Research Center, Department of Mechanical Engineering, Faculty of Engineering & Technology, Marwadi University, Rajkot, 360003, Gujarat, India.

Intermittent renewable energy sources such as solar and wind necessitate energy storage methods like employing phase change materials (PCMs) for latent heat thermal energy storage (LHTES). However, the low thermal conductivity of PCMs limits their thermal response rate. This paper reviews recent progress in active heat transfer augmentation methods for improving LHTES system performance, encompassing mechanical aids, vibrations, jet impingement, injection, and external fields.

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Interplay of Kinetic and Thermodynamic Factors in the Stationary Composition of Vapor-Liquid-Solid IIIVV Nanowires.

Nanomaterials (Basel)

August 2024

Submicron Heterostructures for Microelectronics, Research and Engineering Center RAS, Politekhnicheskaya Street, 26, 194021 St. Petersburg, Russia.

Compositional control over vapor-liquid-solid III-V ternary nanowires based on group V intermix (VLS IIIVV NWs) is complicated by the presence of a catalyst droplet with extremely low and hence undetectable concentrations of group V atoms. The liquid-solid and vapor-solid distributions of IIIVV NWs at a given temperature are influenced by the kinetic parameters (supersaturation and diffusion coefficients in liquid, V/III flux ratio in vapor), temperature and thermodynamic constants. We analyze the interplay of the kinetic and thermodynamic factors influencing the compositions of VLS IIIVV NWs and derive a new vapor-solid distribution that contains only one parameter of liquid, the ratio of the diffusion coefficients of dissimilar group V atoms.

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The taxonomic status of many species of the family Cyclocoelidae is still unclear. Two species of cyclocoelids, and , were collected from the air sacs of birds ( and ) inhabiting the Middle Volga region (European Russia). Here, we provide the first detailed morphological description of these cyclocoelids and combine it with the first molecular phylogenetic analysis of Cyclocoelidae from birds in Russia based on partial sequences of their 28s rDNA and coI mtDNA genes.

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We study recombination processes in nitride LEDs emitting from 270 to 540 nm with EQE ranging from 4% to 70%. We found a significant correlation between the LEDs' electro-optical properties and the degree of nanomaterial disorder (DND) in quantum wells (QWs) and heterointerfaces. DND depends on the nanoarrangement of domain structure, random alloy fluctuations, and the presence of local regions with disrupted alloy stoichiometry.

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Article Synopsis
  • The study explores 29 potato varieties to find new methods for improving potato cultivation and breeding.
  • Key phenotyping tools measured multiple factors like leaf size, number of stems, tuber weight, and virus resistance.
  • Results showed strong positive correlations between yield and bush area, leaf dimensions, and virus resistance, while growth dynamics had an inverse relationship with yield.
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Five spp. parasitize bats in European Russia: , , , , and Their identification is difficult due to a high morphological similarity. The morphological variability of these species is poorly studied.

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Nematodes of the genus are common parasites of the small intestine of amphibians and reptiles. Our recent molecular analysis of nematodes revealed that only , which possesses high morphological variability, parasitizes amphibians and reptiles in European Russia. Here we present the study of nematodes from the European green toad (Anura, Bufonidae) collected at different localities of the Middle Volga region in 2018-2022.

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Article Synopsis
  • Triazole fungicides, specifically Vintage and Titul Duo, negatively impact nodule formation and root weight in peas, with significant effects observed 20 days post-inoculation.
  • Microscopic analysis revealed structural changes in nodules, including cell wall modifications, thickening of infection threads, and accumulation of specific compounds in bacteroids.
  • The study highlights a need for additional research on how pesticides affect legume-symbiosis to improve their application in agriculture.
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Trematode infection of the second intermediate hosts can lead to changes in their fitness and, as a result, a change in the invasion rate of animal communities. It is especially pronounced during the invasion of parasite species that reduce activity due to the manipulation of hosts through the changes of their morphology and physiology. One of these cases is an anomaly P syndrome hotspot found in some populations of water frogs and toads in Europe caused by the trematode Strigea robusta metacercariae.

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Halophytes represent important models for studying the key mechanisms of salt tolerance. One approach to the development of new knowledge of salt tolerance is to study the properties of detergent-resistant membranes (DRMs). In this work, the lipid profiles of DRMs of chloroplasts and mitochondria of euhalophyte Willd, before and after their exposure to shock concentrations of NaCl, have been investigated.

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Twenty-four potato (Solanum tuberosum L.) varieties differing in ripening groups (early, middle-early, and mid-season-ripening) were studied. Potatoes were grown under the conditions of the Middle Volga region of Russia in 2019-2021.

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X-ray diffraction and scanning electron microscopy were used to study changes in the structure of amorphous alloys under deformation by high-pressure torsion and multiple rolling. The change in mean nearest neighbor distance (the radius of the first coordination sphere) under deformation was determined. During deformation, shear bands are formed in amorphous alloys, which are regions of lower density compared to the surrounding undeformed amorphous matrix.

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Single-coil eddy current sensors (SCECS) form a separate and independent branch among the existing eddy current probes. Such sensors are often used for aviation and aerospace applications where the conditions accompanying the measuring process are harsh and even extreme. High temperatures (up to +600 °C in the compressor and over +1000 °C in the turbine of gas turbine engines), the complex shape surfaces of the monitored parts, the multidimensional movement of the power plants' structural elements, restrictions on the probes number and their placement in the measuring zone are the main factors affecting the reliability and accuracy of the measurement results obtained by the sensors.

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Anthocyanins are well-known antioxidants that are beneficial for plants and consumers. Dihydroflavonol-4-reductase () is a key gene of anthocyanin biosynthesis, controlled by multiple transcription factors. Its expression can be enhanced by mutations in the negative regulator of anthocyanin biosynthesis myeloblastosis family transcription factor-like 2 ().

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This study was aimed to investigate the applicability of the exosome fluorescence-lifetime imaging microscopy (FLIM) for colorectal cancer (CRC) diagnosis. Differential ultra-centrifugation was used to extract exosomes from the blood plasma of 11 patients with colon polyps (CPs) and 13 patients with CRC at the T2-4, N0-3, and M0-1 stages. Analysis was performed using a two-photon FLIM device.

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Trematodes of Genera and from Bats in European Russia: Morphology and Molecular Phylogeny.

Biology (Basel)

June 2022

Joint Directorate of the Mordovia State Nature Reserve, National Park "Smolny", Saransk 430005, Russia.

Morphological variability of trematodes from bats (Chiroptera) is poorly studied. Since the variability of adult digenean specimens may be rather high, morphological features are often insufficient for the identification of closely related species, and confirmation with the use of molecular data is required. The aim of our study was to combine the morphological and molecular phylogenetic analyses of several bat trematodes from the genera and (Pleurogenidae): , , , , and , of which and are little known in European Russia.

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Saline rivers are highly productive ecosystems in arid regions. The meiobenthic community (bottom meiofauna) and its dominant representatives are one of the least studied components of these aquatic ecosystems. Ostracods and are major consumers among the species of bottom meiofauna in saline rivers flowing into the hyperhaline Lake Elton (Volgograd Region, Russia).

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Plant cell differentiation is based on rearrangements of the tubulin cytoskeleton; this is also true for symbiotic nodules. Nevertheless, although for indeterminate nodules (with a long-lasting meristem) the organization of microtubules during nodule development has been studied for various species, for determinate ones (with limited meristem activity) such studies are rare. Here, we investigated bacteroid morphology and dynamics of the tubulin cytoskeleton in determinate nodules of four legume species: , , , and .

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Anthocyanin Biosynthesis Genes as Model Genes for Genome Editing in Plants.

Int J Mol Sci

August 2021

Institute of Biochemistry and Genetics, Ufa Federal Research Center RAS, Prospekt Oktyabrya 71, 450054 Ufa, Russia.

CRISPR/Cas, one of the most rapidly developing technologies in the world, has been applied successfully in plant science. To test new nucleases, gRNA expression systems and other inventions in this field, several plant genes with visible phenotypic effects have been constantly used as targets. Anthocyanin pigmentation is one of the most easily identified traits, that does not require any additional treatment.

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Objective: The aim of the study is to identify the consistency of expert opinions when manually identifying the reference points positions for studying the soft-tissue face profile in digital teleradiological images of the skull lateral projection.

Material And Methods: The study involved 11 orthodontists having a 1 to 8 year experience. They localized the reference points manually, using the software with image enhancement options.

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The capacities of the euhalophyte SaLi-Cornia perennans Willd. and glycohalophyte Artemisia santonica L. to accumulate NaCl, Cu, and Cd, as well as their physiological and biochemical responses to these compounds, was investigated.

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Article Synopsis
  • The study investigates lipid profiles and inflammatory markers in patients with stable angina, highlighting differences between those with and without type 2 diabetes mellitus (T2DM) to understand gender-related disease mechanisms.
  • 194 patients, average age 60, were split into two groups: one with angina without diabetes and another with T2DM, examining gender differences within each.
  • Results showed a significant increase in certain atherogenic lipid fractions in women without diabetes, while women with T2DM exhibited higher levels of inflammatory markers; logistic regression identified uric acid and TNF-α as key indicators for worsening ischemic heart disease in women with T2DM.
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