Publications by authors named "Petrova Y"

Introduction: Precise semantic segmentation of microbial alterations is paramount for their evaluation and treatment. This study focuses on harnessing the SegFormer segmentation model for precise semantic segmentation of strawberry diseases, aiming to improve disease detection accuracy under natural acquisition conditions.

Methods: Three distinct Mix Transformer encoders - MiT-B0, MiT-B3, and MiT-B5 - were thoroughly analyzed to enhance disease detection, targeting diseases such as Angular leaf spot, Anthracnose rot, Blossom blight, Gray mold, Leaf spot, Powdery mildew on fruit, and Powdery mildew on leaves.

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Poly(A) tails are crucial for mRNA translation and degradation, but the exact relationship between tail length and mRNA kinetics remains unclear. Here, we employ a small library of identical mRNAs that differ only in their poly(A)-tail length to examine their behavior in human embryonic kidney cells. We find that tail length strongly correlates with mRNA degradation rates but is decoupled from translation.

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  • A study analyzed the genetic variants rs7903146 of the TCF7L2 gene and rs1801282 of the PPARG gene in 64 Tyumen citizens aged 40-70, focusing on their relationship with metabolic parameters and insulin resistance.
  • The researchers found that homozygous carriers of the C allele for rs7903146 had higher C-peptide levels and associations with increased waist circumference, elevated glycated hemoglobin, and hypertension.
  • For the rs1801282 variant, homozygous carriers of the C allele showed higher triglyceride levels and similar associations with waist circumference and glycated hemoglobin compared to other genotypes.
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Extensive crop losses are caused by oomycete and fungal damping-off diseases. Agriculture relies heavily on chemical pesticides to control disease, but due to safety concerns multiple agents have been withdrawn. were successfully used as commercial biopesticides because of their fungicidal activity and plant protective traits.

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The electrochemical features of the interactions of sulfur- and iron-containing compounds (ferrous sulfate, elemental sulfur, pyrite tailings, cysteine, sodium thiosulfate) with a model acidophilic consortium, including the genera , , , , and , were studied. The method of cyclic voltammetry recorded redox processes at the electrode/solution interface in the presence of the studied sulfur- and iron-containing compounds. In general, the modeling consortium led to the intensification of these processes.

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sensu lato bacteria have genomes rich in biosynthetic gene clusters (BGCs) encoding for multiple bioactive specialised metabolites. Diverse classes of antimicrobial natural products have been isolated from , including polyynes, shikimate pathway derivatives, polyketides, non-ribosomal peptides and hybrid polyketide non-ribosomal peptides. We highlight examples of metabolites, overviewing their biosynthesis, bioactivity, mechanisms of action and secretion.

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Burkholderia have potential as biocontrol agents because they encode diverse biosynthetic gene clusters (BGCs) for a range of antimicrobial metabolites. Given the opportunistic pathogenicity associated with Burkholderia species, heterologous BGC expression within non-pathogenic hosts is a strategy to construct safe biocontrol strains. We constructed a yeast-adapted Burkholderia-Escherichia shuttle vector (pMLBAD_yeast) with a yeast replication origin 2 μ and URA3 selection marker and optimised it for cloning BGCs using the in vivo recombination ability of Saccharomyces cerevisiae.

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  • The COVID-19 pandemic has led to the emergence of multiple SARS-CoV-2 variants that show increased resistance to vaccines and treatments, prompting the need for better tools to study these variants.
  • Researchers developed biotin-labeled molecular probes targeting different parts of the SARS-CoV-2 spike protein to help isolate neutralizing antibodies and monitor vaccine effectiveness.
  • The study provides a collection of these probes, which can identify immune responses and aid in the characterization of neutralizing antibodies, with constructs made available for wider research use.
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Aim      To evaluate the right and left ventricular function and their interaction in patients with ischemic heart disease (IHD) complicated with mitral valve insufficiency (MVI) according to data of echocardiography (EchoCG) with the strain in gray scale, vector and diagram analyses.Material and methods  The study included 118 patients evaluated with EchoCG at the preoperative stage of treatment; 71 of these patients had ischemic MVI (group 1) and 47 patients had uncomplicated IHD (group 2 or comparison group). Mean age of patients was 64±10 years.

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Primary melanocytic tumors of the central nervous system (CNS) are extremely rare and account for only 1% of all melanomas and 0.05% of primary brain tumors. In case of diffusely invasive lesions of the pia mater with a tumor of melanocytic origin (without signs of extracranial metastases), the tumors are classified as primary diffuse meningeal melanomatosis (PDMM).

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  • The COVID-19 pandemic has led to the evolution of SARS-CoV-2, resulting in various variants that can resist vaccines and treatments, particularly due to mutations in the virus's spike protein.
  • The researchers designed biotin-labeled molecular probes for these spike variants, allowing for easier isolation of neutralizing antibodies and assessment of vaccine effectiveness.
  • They validated these probes with yeast displaying virus-binding antibodies and made their findings available through Addgene to help further research on immune responses and antibody characterization against COVID-19 variants.
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Natural products that possess alkyne or polyyne moieties have been isolated from a variety of biological sources and possess a broad a range of bioactivities. In bacteria, the basic biosynthesis of polyynes is known, but their biosynthetic gene cluster (BGC) distribution and evolutionary relationship to alkyne biosynthesis have not been addressed. Through comprehensive genomic and phylogenetic analyses, the distribution of alkyne biosynthesis gene cassettes throughout bacteria was explored, revealing evidence of multiple horizontal gene transfer events.

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Biotin-labeled molecular probes, comprising specific regions of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike, would be helpful in the isolation and characterization of antibodies targeting this recently emerged pathogen. Here, we design constructs incorporating an N-terminal purification tag, a site-specific protease-cleavage site, the probe region of interest, and a C-terminal sequence targeted by biotin ligase. Probe regions include full-length spike ectodomain as well as various subregions, and we also design mutants that eliminate recognition of the angiotensin-converting enzyme 2 (ACE2) receptor.

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Application of biologically active compositions, containing colamine, succinic acid, serine, and pyridoxine hydrochloride before hatching decreased hatchery waste and increased hatching rates by 2.65% and egg hatchability by 1.85%.

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Article Synopsis
  • - Researchers developed biotin-labeled molecular probes from regions of the SARS-CoV-2 spike protein to help isolate and study antibodies against the virus.
  • - The design involved using a purification tag and a targeted protease-cleavage site, yielding different amounts of biotin-labeled probes, with specific structures confirmed through cryo-electron microscopy.
  • - Funding for the project came from multiple sources, including the National Institute of Allergy and Infectious Diseases and various grants, while no conflicts of interest were reported by the authors.
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Article Synopsis
  • Researchers created biotin-labeled molecular probes targeting specific regions of the SARS-CoV-2 spike protein to help isolate and study antibodies against the virus.
  • These probes included various designs, such as full-length spike regions and modifications to prevent ACE2 receptor recognition, yielding different amounts during production.
  • The resulting probes were tested for their ability to bind antibodies and were structurally analyzed using advanced imaging techniques, showcasing the effectiveness of combining structural design with purification methods.
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Relational categories are structure-based categories, defined not only by their internal properties but also by their extrinsic relations with other categories. For example, predator could not be defined without referring to hunt and prey. Even though they are commonly used, there are few models taking into account any relational information.

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Mast cells (MCs) participate in allergy, inflammation, and defense against pathogens. They release multiple immune mediators via exocytosis, a process that requires SNARE proteins, including syntaxins (Stxs). The identity of the Stxs involved in MC exocytosis remains controversial.

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Multidrug-resistant tuberculosis (TB), extensively drug-resistant TB, and TB-human immunodeficiency virus (HIV) coinfection require a special approach in anti-TB treatment. Most patients cannot be successfully cured by conventional chemotherapy alone. They need a modern approach using minimally invasive therapeutic and surgical techniques.

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Therapeutic antibodies targeting ovarian cancer (OvCa)-enriched receptors have largely been disappointing due to limited tumor-specific antibody-dependent cellular cytotoxicity. Here we report a symbiotic approach that is highly selective and superior compared with investigational clinical antibodies. This bispecific-anchored cytotoxicity activator antibody is rationally designed to instigate "cis" and "trans" cytotoxicity by combining specificities against folate receptor alpha-1 (FOLR1) and death receptor 5 (DR5).

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α-Methylacyl-CoA racemase (AMACR; P504S) is a promising novel drug target for prostate and other cancers. Assaying enzyme activity is difficult due to the reversibility of the 'racemisation' reaction and the difficulties in the separation of epimeric products; consequently few inhibitors have been described and no structure-activity relationship study has been performed. This paper describes the first structure-activity relationship study, in which a series of 23 known and potential rational AMACR inhibitors were evaluated.

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Mast cells (MCs) play pivotal roles in many inflammatory conditions including infections, anaphylaxis, and asthma. MCs store immunoregulatory compounds in their large cytoplasmic granules and, upon stimulation, secrete them via regulated exocytosis. Exocytosis in many cells requires the participation of Munc18 proteins (also known as syntaxin-binding proteins), and we found that mature MCs express all three mammalian isoforms: Munc18-1, -2, and -3.

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Mast cells (MCs) are involved in host defenses against pathogens and inflammation. Stimulated MCs release substances stored in their granules via regulated exocytosis. In other cell types, Munc13 (mammalian homolog of uncoordinated gene 13) proteins play essential roles in regulated exocytosis.

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