Publications by authors named "Sergey Kazakov"

Two platinide plumbides, EuPtPb and SrPtPb, were discovered using high-temperature exploratory synthesis and flux-assisted crystal growth. Their crystal structures were determined from single-crystal X-ray diffraction. Both compounds crystallize in the orthorhombic system; EuPtPb belongs to the YRhSn structure type (2, = 4.

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The synthesis of langbeinite-type phosphates with small cations such as Li or Na a high-temperature solid-state reaction is a challenging task due to the predominant formation of a related NaSICON-type phase. This work reports on the synthesis route, crystal structure, thermal behavior, and Na-conductive properties of the langbeinite-type NaZr(PO) prepared by a mechanochemically activated ion-exchange reaction between hydrothermally prepared NHZr(PO) and NaNO. The crystal structure of NaZr(PO) is refined based on X-ray diffraction data and validated by Fourier-transformed infrared spectroscopy.

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  • Biodegradable microgels are studied as a drug delivery system, but their degradation and drug release kinetics are not well understood.
  • Spherical microgels were created using specific monomers and a cross-linker with disulfide bonds and tested under varying concentrations of glutathione to observe degradation processes.
  • The study found that microgel degradation involves swelling and erosion processes that occur at different rates, potentially allowing for faster drug release in cancer cells due to higher levels of glutathione.
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  • This study compares the effectiveness of 2-oxoglutarate mimetics and branched-tail oxyquinoline inhibitors in activating HIF prolyl hydroxylase, focusing on their performance in a luciferase reporter assay.
  • Novel oxyquinoline inhibitors identified in this research showed significantly higher potency than existing drugs like roxadustat and vadadustat, especially when 2-methyl substitution was applied.
  • Transcriptomic analysis revealed that the new inhibitors stimulated HIF1 and HIF2 pathways similarly to roxadustat but had distinct effects on alternative pathways involving p53 and NF-κB, suggesting a specific action of the 2-methyl variant on HIF PHD2.
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Ginsenoside Rh2 increases the efficacy of doxorubicin (DOX) treatment in murine models of solid and ascites Ehrlich's adenocarcinoma. In a solid tumor model (treatment commencing 7 days after inoculation), DOX + Rh2 co-treatment was significantly more efficacious than DOX alone. If treatment was started 24 h after inoculation, the inhibition of tumor growth of a solid tumor for the DOX + Rh2 co-treatment group was complete.

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  • The review discusses the potential benefits and drawbacks of using HIF prolyl hydroxylase inhibitors as a treatment option for COVID-19.
  • These inhibitors can enhance the production of erythropoietin (Epo), which has anti-inflammatory and healing effects, possibly helping patients with moderate to severe symptoms.
  • However, while they may address complications arising from the disease, they are not expected to be effective in preventing the initial stages of COVID-19 infection.
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Mutations in FLNC for a long time are known in connection to neuromuscular disorders and only recently were described in association with various cardiomyopathies. Here, we report a new clinical phenotype of filaminopathy in four unrelated patients with early-onset restrictive cardiomyopathy (RCM) in combination with congenital myopathy due to FLNC mutations (NM_001458.4:c.

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  • - Preeclampsia (PE) is a critical pregnancy complication linked to high maternal and fetal mortality, highlighting the need for early diagnosis and treatment.
  • - Researchers conducted targeted next-generation sequencing to analyze genetic variations in patients with PE compared to a control group, utilizing bioinformatics tools for assessment.
  • - They identified several genetic markers associated with PE and one variant potentially protective against it, but further investigation is needed to fully understand the gene's role in the disease's development during pregnancy.
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This is the announcement of a draft genome sequence of strain Leningrad-2, phase I. The strain, which is mildly virulent in infected guinea pigs, was isolated in 1957 from the blood of a patient with acute Q fever in Leningrad (now Saint Petersburg), Russia.

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A series of substitutional solid solutions-Eu₇CuTAs (T = Fe, Co, Ni)-based on a recently discovered clathrate-like compound (Eu₇CuAs) were synthesized from the elements at 800 °C. Almost up to 50% of Cu can be substituted by Ni, resulting in a linear decrease of the cubic unit cell parameter from = 16.6707(1) Å for the ternary compound to = 16.

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The result of polymeric nanogels and lipid vesicles interaction-lipobeads-can be considered as multipurpose containers for future therapeutic applications, such as targeted anticancer chemotherapy with superior tumor response and minimum side effects. In this work, micrometer sized lipobeads were synthesized by two methods: (i) mixing separately prepared microgels made of poly(N-isopropylacrylamide) (PNIPA) and phospholipid vesicles of micrometer or nanometer size and (ii) polymerization within the lipid vesicles. For the first time, a high vacuum scanning electron microscopy was shown to be suitable for a quick validation of the structural organization of wet lipobeads and their constituents without special sample preparation.

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  • Flavonoids can activate genetic responses to low oxygen and oxidative stress by interacting with estrogen receptors or activating certain kinases.
  • * The study evaluated various compounds like flavones and catechols to identify their ability to stabilize key transcription factors HIF1 and Nrf2, which are crucial for hypoxic and antioxidant defenses.
  • * It was found that NDGA, a compound from the Creosote bush, effectively stabilizes HIF1 and Nrf2 and shows strong neuroprotective effects in a Parkinson's Disease animal model, outperforming typical flavonoids due to its better bioavailability and stability.
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Two new compounds with the LaOAgS structure, EuFZnAs (1) and EuFZnSb (2), were obtained via solid state reaction. Both compounds are tetragonal (P4/nmm) with the cell parameters a = 4.1000(1) Å and c = 9.

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  • High-throughput metagenomic sequencing has transformed our understanding of microbial communities, but analyzing their composition remains challenging due to high complexity and lack of reference genomes.* -
  • The researchers developed MetaFast, a computational method that represents metagenomes using a modified de Bruijn graph, allowing for efficient analysis and comparison of diverse microbial environments.* -
  • MetaFast is freely available for download and is designed to work across different platforms, making it accessible for analyzing metagenomes from previously unexplored niches.*
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Nature uses combination of lipid bilayers and cross-linked macromolecular networks to achieve workability, multifunctionality, and dynamism in living cells of different types. Despite the concept of liposome-nanogel structures (lipobeads) is known for about 30 years, lipobead-based drug delivery systems are still largely experimental. The data available on nano- and giant lipobeads are reviewed to demonstrate technological achievability of lipobeads and to support the expectations that additional expenses on their production will be reimbursed by the potential advantages of their use.

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  • * It shares 99% similarity in 16S rRNA sequences with various Pantoea species but has unique biochemical traits that complicate its exact species identification.
  • * The genome of strain 3.5.1 is composed of nearly 4.97 million base pairs and includes 4,556 protein-coding and 143 RNA genes, along with two phytase genes linked to its phytate-degrading activity.
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About 20 new compounds with the Sillén-Aurivillius intergrowth structure, Me(1)Me(2)Bi3Nb2O11X (Me(1) = Pb, Sr, Ba; Me(2) = Ca, Sr, Ba; X = Cl, Br, I), have been prepared. They are composed of stacking of [ANb2O7] perovskite blocks, fluorite-type [M2O2] blocks and halogen sheets. The cation distribution between the fluorite and perovskite layers has been studied for Ba2Bi3Nb2O11I, Ca1.

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  • - The paper reveals the complete genome sequence of the Bacillus ginsengihumi strain M2.11, known for producing an enzyme that can break down phytase.
  • - The genome size of strain M2.11 is 3.7 megabases (Mb).
  • - This strain contains a total of 3,082 coding sequences within its genome.
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  • Hypertrophic cardiomyopathy is a genetic heart disease that requires early diagnosis, but traditional methods are often ineffective due to the numerous causative genes and mutations involved.
  • A custom AmpliSeq panel was developed to analyze key genes associated with cardiomyopathy using next-generation sequencing on both student cohorts and patients, applying statistical software for genetic marker selection.
  • The findings revealed multiple gene substitutions linked to cardiomyopathy risk, along with protective genetic variants, demonstrating the potential of this method for improved risk prediction in patients.
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Two new ternary arsenides, namely, Eu7Cu44As23 and Sr7Cu44As23, were synthesized from elements at 800 °C. Their crystal structure represents a new filled version of the BaHg11 motif with cubic voids alternately occupied by Eu(Sr) and As atoms, resulting in a 2 × 2 × 2 superstructure of the aristotype: space group Fm3̅m, a = 16.6707(2) Å and 16.

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  • The first draft genome assembly of Serratia grimesii strain A2 has been completed, correcting its prior identification as Escherichia coli strain A2.
  • This strain produces a specific protease called ECP32 that targets the protein actin.
  • Additionally, S. grimesii strain A2 exhibits multidrug resistance because it contains multiple efflux pump genes.
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Background: The process of generating raw genome sequence data continues to become cheaper, faster, and more accurate. However, assembly of such data into high-quality, finished genome sequences remains challenging. Many genome assembly tools are available, but they differ greatly in terms of their performance (speed, scalability, hardware requirements, acceptance of newer read technologies) and in their final output (composition of assembled sequence).

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Three new ternary copper phosphides, Sr(2)Cu(6)P(5), Eu(2)Cu(6)P(5), and EuCu(4)P(3), have been synthesized from the elements in evacuated silica capsules. Eu(2)Cu(6)P(5) and Sr(2)Cu(6)P(5) adopt the Ca(2)Cu(6)P(5)-type structure, while EuCu(4)P(3) is isostructural to BaMg(4)Si(3) and still remains the only representative of this structure type among the ternary Cu pnictides. All three materials show metallic conductivity in the temperature range 2 K ≤ T ≤ 290 K, with no indication for superconductivity.

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Small molecules inhibiting hypoxia inducible factor (HIF) prolyl hydroxylases (PHDs) are the focus of drug development efforts directed toward the treatment of ischemia and metabolic imbalance. A cell-based reporter produced by fusing HIF-1 alpha oxygen degradable domain (ODD) to luciferase was shown to work as a capture assay monitoring stability of the overexpressed luciferase-labeled HIF PHD substrate under conditions more physiological than in vitro test tubes. High throughput screening identified novel catechol and oxyquinoline pharmacophores with a "branching motif" immediately adjacent to a Fe-binding motif that fits selectively into the HIF PHD active site in in silico models.

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