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Vassilev N, Mendes GDO. Soil Fungi in Sustainable Agriculture. Microorganisms 2024; 12:163. [PMID: 38257989 PMCID: PMC10819681 DOI: 10.3390/microorganisms12010163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Accepted: 01/11/2024] [Indexed: 01/24/2024] Open
Abstract
It is widely accepted that the continuously growing human population needs rapid solutions to respond to the increased global demand for high agricultural productivity [...].
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Affiliation(s)
- Nikolay Vassilev
- Department of Chemical Engineering, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain
- Institute of Biotechnology, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain
| | - Gilberto de Oliveira Mendes
- Laboratório de Microbiologia e Fitopatologia, Instituto de Ciências Agrárias, Universidade Federal de Uberlândia, Monte Carmelo 38500-000, Brazil;
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2
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Angelova VT, Georgiev B, Pencheva T, Pajeva I, Rangelov M, Todorova N, Zheleva-Dimitrova D, Kalcheva-Yovkova E, Valkova IV, Vassilev N, Mihaylova R, Stefanova D, Petrov B, Voynikov Y, Tzankova V. Design, Synthesis, In Silico Studies and In Vitro Evaluation of New Indole- and/or Donepezil-like Hybrids as Multitarget-Directed Agents for Alzheimer's Disease. Pharmaceuticals (Basel) 2023; 16:1194. [PMID: 37765003 PMCID: PMC10534827 DOI: 10.3390/ph16091194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 08/13/2023] [Accepted: 08/17/2023] [Indexed: 09/29/2023] Open
Abstract
Alzheimer's disease (AD) is considered a complex neurodegenerative condition which warrants the development of multitargeted drugs to tackle the key pathogenetic mechanisms of the disease. In this study, two novel series of melatonin- and donepezil-based hybrid molecules with hydrazone (3a-r) or sulfonyl hydrazone (5a-l) fragments were designed, synthesized, and evaluated as multifunctional ligands against AD-related neurodegenerative mechanisms. Two lead compounds (3c and 3d) exhibited a well-balanced multifunctional profile, demonstrating intriguing acetylcholinesterase (AChE) inhibition, promising antioxidant activity assessed by DPPH, ABTS, and FRAP methods, as well as the inhibition of lipid peroxidation in the linoleic acid system. Compound 3n, possessing two indole scaffolds, showed the highest activity against butyrylcholinesterase (BChE) and a high selectivity index (SI = 47.34), as well as a pronounced protective effect in H2O2-induced oxidative stress in SH-SY5Y cells. Moreover, compounds 3c, 3d, and 3n showed low neurotoxicity against malignant neuroblastoma cell lines of human (SH-SY5Y) and murine (Neuro-2a) origin, as well as normal murine fibroblast cells (CCL-1) that indicate the in vitro biocompatibility of the experimental compounds. Furthermore, compounds 3c, 3d, and 3n were capable of penetrating the blood-brain barrier (BBB) in the experimental PAMPA-BBB study. The molecular docking showed that compound 3c could act as a ligand to both MT1 and MT2 receptors, as well as to AchE and BchE enzymes. Taken together, those results outline compounds 3c, 3d, and 3n as promising prototypes in the search of innovative compounds for the treatment of AD-associated neurodegeneration with oxidative stress. This study demonstrates that hydrazone derivatives with melatonin and donepezil are appropriate for further development of new AChE/BChE inhibitory agents.
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Affiliation(s)
- Violina T. Angelova
- Department of Chemistry, Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria; (I.V.V.); (Y.V.)
| | - Borislav Georgiev
- Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (B.G.); (N.T.)
| | - Tania Pencheva
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (T.P.); (I.P.)
| | - Ilza Pajeva
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (T.P.); (I.P.)
| | - Miroslav Rangelov
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (M.R.); (N.V.)
| | - Nadezhda Todorova
- Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (B.G.); (N.T.)
| | | | - Elena Kalcheva-Yovkova
- Faculty of Computer Systems and Techologies, Technical University–Sofia, 1000 Sofia, Bulgaria;
| | - Iva V. Valkova
- Department of Chemistry, Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria; (I.V.V.); (Y.V.)
| | - Nikolay Vassilev
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (M.R.); (N.V.)
| | - Rositsa Mihaylova
- Department of Pharmacology, Pharmacotherapy and Toxicology, Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria; (R.M.); (D.S.); (B.P.); (V.T.)
| | - Denitsa Stefanova
- Department of Pharmacology, Pharmacotherapy and Toxicology, Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria; (R.M.); (D.S.); (B.P.); (V.T.)
| | - Boris Petrov
- Department of Pharmacology, Pharmacotherapy and Toxicology, Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria; (R.M.); (D.S.); (B.P.); (V.T.)
| | - Yulian Voynikov
- Department of Chemistry, Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria; (I.V.V.); (Y.V.)
| | - Virginia Tzankova
- Department of Pharmacology, Pharmacotherapy and Toxicology, Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria; (R.M.); (D.S.); (B.P.); (V.T.)
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Al Methyeb M, Ruppel S, Eichler-Löbermann B, Vassilev N. The Combined Applications of Microbial Inoculants and Organic Fertilizer Improve Plant Growth under Unfavorable Soil Conditions. Microorganisms 2023; 11:1721. [PMID: 37512893 PMCID: PMC10385813 DOI: 10.3390/microorganisms11071721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 06/25/2023] [Accepted: 06/29/2023] [Indexed: 07/30/2023] Open
Abstract
The performance of two bio-inoculants either in single or in combined applications with organic fertilizer was tested to determine their effect on plant growth and yield under normal and unfavorable field conditions such as low pH value and low content of P. Arbuscular Mycorrhiza Fungi (AMF; three species of Glomus) and the plant-growth-promoting bacterial strain Kosakonia radicincitans DSM16656 were applied to barley in a two-year field experiment with different soil pH levels and available nutrients. Grain yield; contents of P, N, K, and Mg; and soil microbial parameters were measured. Grain yield and the content of nutrients were significantly increased by the applications of mineral fertilizer, organic fertilizer, AMF, and K. radicincitans, and the combined application of organic fertilizer with AMF and with K. radicincitans over the control under normal growth conditions. Under low-pH and low-P conditions, only the combined application of the organic fertilizer with K. radicincitans and organic fertilizer with AMF could increase the grain yield and content of nutrients of barley over the control.
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Affiliation(s)
- Malek Al Methyeb
- Faculty of Agricultural and Environmental Sciences, University of Rostock, Justus-von-Liebig Weg 6, D-18051 Rostock, Germany
| | - Silke Ruppel
- Leibniz Institute of Vegetable and Ornamental Crops (IGZ), Theodor-Echtermeyer-Weg 1, D-14979 Grossbeeren, Germany
| | - Bettina Eichler-Löbermann
- Faculty of Agricultural and Environmental Sciences, University of Rostock, Justus-von-Liebig Weg 6, D-18051 Rostock, Germany
| | - Nikolay Vassilev
- Institute of Biotechnology, Department of Chemical Engineering, University of Granada, 18071 Granada, Spain
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Vassileva M, Martos V, Del Moral LFG, Vassilev N. Effect of the Mode of Fermentation on the Behavior of Penicillium bilaiae in Conditions of Abiotic Stress. Microorganisms 2023; 11:microorganisms11041064. [PMID: 37110487 PMCID: PMC10143995 DOI: 10.3390/microorganisms11041064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 04/17/2023] [Accepted: 04/17/2023] [Indexed: 04/29/2023] Open
Abstract
The ability of a Penicillium bilaiae strain to support acid production and simultaneously solubilize inorganic sources of phosphate in conditions of submerged, solid-state fermentation (SSF) and immobilized cell system was examined in this study. Abiotic stress factors such as NaCl and different values of pH were introduced into the different fermentation process schemes to measure the fungal response. The results showed a higher tolerance of P. bilaiae when the fermentation process was carried out in solid-state and immobilized-cell conditions, which mimics the natural state of the soil microorganisms. The acidic culture conditions were not found to be suitable for fungal growth, which increased at a higher pH, with values of 4.0 and 6.0 being optimal for all types of fermentation. The presence of increasing amounts of NaCl provoked low biomass growth, titratable acidity, and simultaneous phosphate (P) solubilization. These results were, however, less pronounced at pH 4.0 and 6.0, particularly in conditions of SSF. Studying stress-tolerant microbial characteristics, particularly in different conditions and combinations of stress factors, is of great importance for further managing the overall microbial inoculants' production and formulation process as well as their applications in specific soil-plant systems.
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Affiliation(s)
- María Vassileva
- Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain
| | - Vanessa Martos
- Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain
| | | | - Nikolay Vassilev
- Instituto de Biotecnología, Universidad de Granada, 18071 Granada, Spain
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Angelova VT, Tatarova T, Mihaylova R, Vassilev N, Petrov B, Zhivkova Z, Doytchinova I. Novel Arylsulfonylhydrazones as Breast Anticancer Agents Discovered by Quantitative Structure-Activity Relationships. Molecules 2023; 28:molecules28052058. [PMID: 36903304 PMCID: PMC10004090 DOI: 10.3390/molecules28052058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 02/20/2023] [Accepted: 02/21/2023] [Indexed: 02/25/2023] Open
Abstract
Breast cancer (BC) is the second leading cause of cancer death in women, with more than 600,000 deaths annually. Despite the progress that has been made in early diagnosis and treatment of this disease, there is still a significant need for more effective drugs with fewer side effects. In the present study, we derive QSAR models with good predictive ability based on data from the literature and reveal the relationships between the chemical structures of a set of arylsulfonylhydrazones and their anticancer activity on human ER+ breast adenocarcinoma and triple-negative breast (TNBC) adenocarcinoma. Applying the derived knowledge, we design nine novel arylsulfonylhydrazones and screen them in silico for drug likeness. All nine molecules show suitable drug and lead properties. They are synthesized and tested in vitro for anticancer activity on MCF-7 and MDA-MB-231 cell lines. Most of the compounds are more active than predicted and show stronger activity on MCF-7 than on MDA-MB-231. Four of the compounds (1a, 1b, 1c, and 1e) show IC50 values below 1 μM on MCF-7 and one (1e) on MDA-MB-231. The presence of an indole ring bearing 5-Cl, 5-OCH3, or 1-COCH3 has the most pronounced positive effect on the cytotoxic activity of the arylsulfonylhydrazones designed in the present study.
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Affiliation(s)
- Violina T. Angelova
- Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria
- Correspondence: (V.T.A.); (I.D.)
| | - Teodora Tatarova
- Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria
| | - Rositsa Mihaylova
- Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria
| | - Nikolay Vassilev
- Laboratory “Nuclear Magnetic Resonance”, Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Boris Petrov
- Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria
| | - Zvetanka Zhivkova
- Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria
| | - Irini Doytchinova
- Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria
- Correspondence: (V.T.A.); (I.D.)
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6
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Malusà E, Vassilev N, Neri D, Xu X. Editorial: Plant root interaction with associated microbiomes to improve plant resiliency and crop biodiversity, volume II. Front Plant Sci 2023; 14:1143657. [PMID: 36866362 PMCID: PMC9971992 DOI: 10.3389/fpls.2023.1143657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Accepted: 01/31/2023] [Indexed: 06/18/2023]
Affiliation(s)
- E. Malusà
- Department of Plant Protection, National Institute of Horticultural Research, Skierniewice, Poland
- Council for Agricultural Research and Economics - Center for Viticulture and Enology, Conegliano, Italy
| | - N. Vassilev
- Department of Chemical Engineering, Institute of Biotechnology, University of Granada, Granada, Spain
| | - D. Neri
- Dipartimento di Scienze Agrarie, Alimentari ed Ambientali, Università Politecnica delle Marche, Ancona, Italy
| | - X. Xu
- NIAB, West Malling, United Kingdom
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7
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Deneva V, Slavova S, Kumanova A, Vassilev N, Nedeltcheva-Antonova D, Antonov L. Favipiravir-Tautomeric and Complexation Properties in Solution. Pharmaceuticals (Basel) 2022; 16:ph16010045. [PMID: 36678542 PMCID: PMC9864296 DOI: 10.3390/ph16010045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 12/16/2022] [Accepted: 12/23/2022] [Indexed: 12/31/2022] Open
Abstract
The tautomeric properties of favipiravir were investigated experimentally for the first time by using molecular spectroscopy (UV-Vis absorption, fluorescence and NMR), as well as DFT quantum-chemical calculations. According to the obtained results, the enol tautomer is substantially more stable in most of the organic solvents. In the presence of water, a keto form appears to be favored due to the specific solute-solvent interactions. Upon the addition of alkaline-earth-metal ions, deprotonation and complexation occurred simultaneously, giving the formation of 2 : 1 ligand : metal complexes. According to the theoretical simulations, the metal ion is captured between the carbonyl groups as a result of the size-fit effect.
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Affiliation(s)
- Vera Deneva
- Institute of Electronics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
- Correspondence: (V.D.); (L.A.)
| | - Sofia Slavova
- Institute of Electronics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Alina Kumanova
- Institute of Electronics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
| | - Nikolay Vassilev
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Daniela Nedeltcheva-Antonova
- Institute of Electronics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Luidmil Antonov
- Institute of Electronics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
- Correspondence: (V.D.); (L.A.)
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8
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Vassileva M, Mendes GDO, Deriu MA, Benedetto GD, Flor-Peregrin E, Mocali S, Martos V, Vassilev N. Fungi, P-Solubilization, and Plant Nutrition. Microorganisms 2022; 10:microorganisms10091716. [PMID: 36144318 PMCID: PMC9503713 DOI: 10.3390/microorganisms10091716] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 08/19/2022] [Accepted: 08/23/2022] [Indexed: 11/16/2022] Open
Abstract
The application of plant beneficial microorganisms is widely accepted as an efficient alternative to chemical fertilizers and pesticides. It was shown that annually, mycorrhizal fungi and nitrogen-fixing bacteria are responsible for 5 to 80% of all nitrogen, and up to 75% of P plant acquisition. However, while bacteria are the most studied soil microorganisms and most frequently reported in the scientific literature, the role of fungi is relatively understudied, although they are the primary organic matter decomposers and govern soil carbon and other elements, including P-cycling. Many fungi can solubilize insoluble phosphates or facilitate P-acquisition by plants and, therefore, form an important part of the commercial microbial products, with Aspergillus, Penicillium and Trichoderma being the most efficient. In this paper, the role of fungi in P-solubilization and plant nutrition will be presented with a special emphasis on their production and application. Although this topic has been repeatedly reviewed, some recent views questioned the efficacy of the microbial P-solubilizers in soil. Here, we will try to summarize the proven facts but also discuss further lines of research that may clarify our doubts in this field or open new perspectives on using the microbial and particularly fungal P-solubilizing potential in accordance with the principles of the sustainability and circular economy.
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Affiliation(s)
- Maria Vassileva
- Department of Chemical Engineering, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain
| | - Gilberto de Oliveira Mendes
- Laboratório de Microbiologia e Fitopatologia, Instituto de Ciências Agrárias, Universidade Federal de Uberlândia, Monte Carmelo 38500-000, Brazil
| | - Marco Agostino Deriu
- PolitoBIOMed Lab, Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Turin, Italy
| | | | - Elena Flor-Peregrin
- Department of Chemical Engineering, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain
| | - Stefano Mocali
- Council for Agricultural Research and Analysis of the Agricultural Economy, Research Centre for Agriculture and Environment, 50125 Firenze, Italy
| | - Vanessa Martos
- Institute of Biotechnology, University of Granada, 18071 Granada, Spain
| | - Nikolay Vassilev
- Department of Chemical Engineering, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain
- Institute of Biotechnology, University of Granada, 18071 Granada, Spain
- Correspondence:
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9
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Vezenkov LT, Danalev DL, Iwanov I, Lozanov V, Atanasov A, Todorova R, Vassilev N, Karadjova V. Synthesis and biological study of new galanthamine-peptide derivatives designed for prevention and treatment of Alzheimer 's disease. Amino Acids 2022; 54:897-910. [PMID: 35562605 DOI: 10.1007/s00726-022-03167-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 04/23/2022] [Indexed: 11/29/2022]
Abstract
The Alzheimer's disease leads to neurodegenerative processes and affecting negatively million people worldwide. The treatment of the disease is still difficult and incomplete in practice. Galanthamine is one of the most commonly used drugs against the illness. The main aim of this work is design and synthesis of new derivatives of galanthamine comprising peptide moiety as well as study of their β-secretase inhibitory activity and the anti-aggregating effect. All new derivatives of galanthamine containing analogues of Leu-Val-Phe-Phe (Aβ17-Aβ20) were synthesized in solution using fragment and consecutive condensation approaches. The new derivatives were characterized by melting points, NMR, and HPLC/MS. They were tested in vitro for β-secretase inhibition activity by means of fluorescent method and were investigated in vitro for anti-aggregation activity on sheep platelet-rich plasma. Although the new compounds do not contain a structural element responsible for the β-secretase inhibition, five of them show high or good β-secretase inhibitory activity between 19.98 and 51.19% with IC50 between 1.95 and 5.26 nM. Four of the new molecules were able to inhibit platelet aggregation between 55.0 and 90.0% with IC50 between 0.69 and 1.36 µM. Four of the compounds were able to inhibit platelet aggregation and two of them have high anti-aggregating effects.
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Affiliation(s)
| | - Dancho L Danalev
- University of Chemical Technology and Metallurgy, Sofia, 1756, Bulgaria.
| | - Iwan Iwanov
- University of Chemical Technology and Metallurgy, Sofia, 1756, Bulgaria
| | - Valentin Lozanov
- Department of Medical Chemistry and Biochemistry, Medical University of Sofia, Sofia, 1000, Bulgaria
| | - Atanas Atanasov
- Medical Faculty, Trakia University, Stara Zagora, 6000, Bulgaria
| | - Rumyana Todorova
- Medical Faculty, Trakia University, Stara Zagora, 6000, Bulgaria
| | - Nikolay Vassilev
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria
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Vassileva M, Mocali S, Canfora L, Malusá E, García del Moral LF, Martos V, Flor-Peregrin E, Vassilev N. Safety Level of Microorganism-Bearing Products Applied in Soil-Plant Systems. Front Plant Sci 2022; 13:862875. [PMID: 35574066 PMCID: PMC9096872 DOI: 10.3389/fpls.2022.862875] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 03/18/2022] [Indexed: 05/17/2023]
Abstract
The indiscriminate use of chemical fertilizers adversely affects ecological health and soil microbiota provoking loss of soil fertility and greater pathogen and pest presence in soil-plant systems, which further reduce the quality of food and human health. Therefore, the sustainability, circular economy, environmental safety of agricultural production, and health concerns made possible the practical realization of eco-friendly biotechnological approaches like organic matter amendments, biofertilizers, biopesticides, and reuse of agro-industrial wastes by applying novel and traditional methods and processes. However, the advancement in the field of Biotechnology/Agriculture is related to the safety of these microorganism-bearing products. While the existing regulations in this field are well-known and are applied in the preparation and application of waste organic matter and microbial inoculants, more attention should be paid to gene transfer, antibiotic resistance, contamination of the workers and environment in farms and biotech-plants, and microbiome changes. These risks should be carefully assessed, and new analytical tools and regulations should be applied to ensure safe and high-quality food and a healthy environment for people working in the field of bio-based soil amendments.
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Affiliation(s)
- Maria Vassileva
- Department of Chemical Engineering, Institute of Biotechnology, University of Granada, Granada, Spain
| | - Stefano Mocali
- Council for Agricultural Research and Economics, Research Centre for Agriculture and Environment, Rome, Italy
| | - Loredana Canfora
- Council for Agricultural Research and Economics, Research Centre for Agriculture and Environment, Rome, Italy
| | - Eligio Malusá
- Research Institute of Horticulture, Skierniewice, Poland
- Council for Agricultural Research and Economics, Center for Viticulture and Enology, Conegliano, Italy
| | | | - Vanessa Martos
- Department of Plant Physiology, University of Granada, Granada, Spain
| | - Elena Flor-Peregrin
- Department of Chemical Engineering, Institute of Biotechnology, University of Granada, Granada, Spain
| | - Nikolay Vassilev
- Department of Chemical Engineering, Institute of Biotechnology, University of Granada, Granada, Spain
- Institute of Biotechnology, University of Granada, Granada, Spain
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11
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Angelova VT, Pencheva T, Vassilev N, K-Yovkova E, Mihaylova R, Petrov B, Valcheva V. Development of New Antimycobacterial Sulfonyl Hydrazones and 4-Methyl-1,2,3-thiadiazole-Based Hydrazone Derivatives. Antibiotics (Basel) 2022; 11:antibiotics11050562. [PMID: 35625207 PMCID: PMC9137698 DOI: 10.3390/antibiotics11050562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 04/19/2022] [Accepted: 04/19/2022] [Indexed: 12/03/2022] Open
Abstract
Fifteen 4-methyl-1,2,3-thiadiazole-based hydrazone derivatives 3a–d and sulfonyl hydrazones 5a–k were synthesized. They were characterized by 1H-NMR, 13C NMR, and HRMS. Mycobacterium tuberculosis strain H37Rv was used to assess their antimycobacterial activity. All compounds demonstrated significant minimum inhibitory concentrations (MIC) from 0.07 to 0.32 µM, comparable to those of isoniazid. The cytotoxicity was evaluated using the standard MTT-dye reduction test against human embryonic kidney cells HEK-293T and mouse fibroblast cell line CCL-1. 4-Hydroxy-3-methoxyphenyl substituted 1,2,3-thiadiazole-based hydrazone derivative 3d demonstrated the highest antimycobacterial activity (MIC = 0.0730 µM) and minimal associated cytotoxicity against two normal cell lines (selectivity index SI = 3516, HEK-293, and SI = 2979, CCL-1). The next in order were sulfonyl hydrazones 5g and 5k with MIC 0.0763 and 0.0716 µM, respectively, which demonstrated comparable minimal cytotoxicity. All compounds were subjected to ADME/Tox computational predictions, which showed that all compounds corresponded to Lipinski’s Ro5, and none were at risk of toxicity. The suitable scores of molecular docking performed on two crystallographic structures of enoyl-ACP reductase (InhA) provide promising insight into possible interaction with the InhA receptor. The 4-methyl-1,2,3-thiadiazole-based hydrazone derivatives and sulfonyl hydrazones proved to be new classes of lead compounds having the potential of novel candidate antituberculosis drugs.
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Affiliation(s)
- Violina T. Angelova
- Department of Chemistry, Faculty of Pharmacy, Medical University, 1431 Sofia, Bulgaria;
- Correspondence: or (V.T.A.); (V.V.)
| | - Tania Pencheva
- Department of QSAR and Molecular Modeling, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;
| | - Nikolay Vassilev
- Laboratory “Nuclear Magnetic Resonance”, Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;
| | - Elena K-Yovkova
- Faculty of Computer Systems and Technologies, Technical University, 1756 Sofia, Bulgaria;
| | - Rositsa Mihaylova
- Laboratory “Drug Metabolism and Drug Toxicity”, Department “Pharmacology, Pharmacotherapy and Toxicology”, Faculty of Pharmacy, Medical University, 1431 Sofia, Bulgaria;
| | - Boris Petrov
- Department of Chemistry, Faculty of Pharmacy, Medical University, 1431 Sofia, Bulgaria;
| | - Violeta Valcheva
- Laboratory of Molecular Biology of Mycobacteria, Department of Infectious Microbiology, The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
- Correspondence: or (V.T.A.); (V.V.)
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Ahmedova A, Pavlović G, Marinov M, Marinova P, Momekov G, Paradowska K, Yordanova S, Stoyanov S, Vassilev N, Stoyanov N. Synthesis and anticancer activity of Pt(II) complexes of spiro-5-substituted 2,4-dithiohydantoins. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120605] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Vassilev N, Malusà E, Neri D, Xu X. Editorial: Plant Root Interaction With Associated Microbiomes to Improve Plant Resiliency and Crop Biodiversity. Front Plant Sci 2021; 12:715676. [PMID: 34276755 PMCID: PMC8283818 DOI: 10.3389/fpls.2021.715676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 06/01/2021] [Indexed: 06/13/2023]
Affiliation(s)
| | - Eligio Malusà
- Department of Plant Protection, The National Institute of Horticultural Research, Skierniewice, Poland
| | - Davide Neri
- Marche Polytechnic University, Ancona, Italy
| | - Xiangming Xu
- NIAB EMR, Department of Pest and Pathogen Ecology, West Malling, United Kingdom
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Vassilev N, Malusà E, Neri D, Xu X. Editorial: Plant Root Interaction With Associated Microbiomes to Improve Plant Resiliency and Crop Biodiversity. Front Plant Sci 2021; 12:715676. [PMID: 34276755 DOI: 10.3389/978-2-88971-278-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 06/01/2021] [Indexed: 05/28/2023]
Affiliation(s)
| | - Eligio Malusà
- Department of Plant Protection, The National Institute of Horticultural Research, Skierniewice, Poland
| | - Davide Neri
- Marche Polytechnic University, Ancona, Italy
| | - Xiangming Xu
- NIAB EMR, Department of Pest and Pathogen Ecology, West Malling, United Kingdom
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Georgiev A, Yordanov D, Vassilev N, Deneva V, Nedeltcheva D, Angelov I, Antonov L. A single isomer rotary switch demonstrating anti-Kasha behaviour: Does acidity function matter? Phys Chem Chem Phys 2021; 23:13760-13767. [PMID: 34132295 DOI: 10.1039/d1cp01378e] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A novel rotary switch, overcoming the disadvantages of hydrazone based switches with competitive proton acceptor sub-rotors, has been designed. The new compound contains a pyridyl ring and a COOH group as sub-rotors, which provides engagement of the pyridyl nitrogen atom and leads to the existence of a single isomer in the ground state. The availability of acidic functionality in the rotor creates conditions for excited state intramolecular proton transfer (ESIPT), which exhibits anti-Kasha behavior.
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Affiliation(s)
- Anton Georgiev
- Department of Organic Chemistry, University of Chemical Technology and Metallurgy, 1756 Sofia, Bulgaria
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16
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Vassileva M, Malusà E, Sas-Paszt L, Trzcinski P, Galvez A, Flor-Peregrin E, Shilev S, Canfora L, Mocali S, Vassilev N. Fermentation Strategies to Improve Soil Bio-Inoculant Production and Quality. Microorganisms 2021; 9:1254. [PMID: 34207668 PMCID: PMC8229917 DOI: 10.3390/microorganisms9061254] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 05/21/2021] [Accepted: 06/07/2021] [Indexed: 12/04/2022] Open
Abstract
The application of plant beneficial microorganisms has been widely accepted as an efficient alternative to chemical fertilizers and pesticides. Isolation and selection of efficient microorganisms, their characterization and testing in soil-plant systems are well studied. However, the production stage and formulation of the final products are not in the focus of the research, which affects the achievement of stable and consistent results in the field. Recent analysis of the field of plant beneficial microorganisms suggests a more integrated view on soil inoculants with a special emphasis on the inoculant production process, including fermentation, formulation, processes, and additives. This mini-review describes the different groups of fermentation processes and their characteristics, bearing in mind different factors, both nutritional and operational, which affect the biomass/spores yield and microbial metabolite activity. The characteristics of the final products of fermentation process optimization strategies determine further steps of development of the microbial inoculants. Submerged liquid and solid-state fermentation processes, fed-batch operations, immobilized cell systems, and production of arbuscular mycorrhiza are presented and their advantages and disadvantages are discussed. Recommendations for further development of the fermentation strategies for biofertilizer production are also considered.
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Affiliation(s)
- Maria Vassileva
- Department of Chemical Engineering, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain; (M.V.); (A.G.); (E.F.-P.)
| | - Eligio Malusà
- The National Institute of Horticultural Research, 96-100 Skierniewice, Poland; (E.M.); (L.S.-P.); (P.T.)
| | - Lidia Sas-Paszt
- The National Institute of Horticultural Research, 96-100 Skierniewice, Poland; (E.M.); (L.S.-P.); (P.T.)
| | - Pawel Trzcinski
- The National Institute of Horticultural Research, 96-100 Skierniewice, Poland; (E.M.); (L.S.-P.); (P.T.)
| | - Antonia Galvez
- Department of Chemical Engineering, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain; (M.V.); (A.G.); (E.F.-P.)
| | - Elena Flor-Peregrin
- Department of Chemical Engineering, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain; (M.V.); (A.G.); (E.F.-P.)
| | - Stefan Shilev
- Department of Microbiology and Environmental Biotechnology, University of Agriculture-Plovdiv, 4000 Plovdiv, Bulgaria;
| | - Loredana Canfora
- Research Centre for Agriculture and Environment, Council for Agricultural Research and Economics, 00184 Roma, Italy; (L.C.); (S.M.)
| | - Stefano Mocali
- Research Centre for Agriculture and Environment, Council for Agricultural Research and Economics, 00184 Roma, Italy; (L.C.); (S.M.)
| | - Nikolay Vassilev
- Department of Chemical Engineering, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain; (M.V.); (A.G.); (E.F.-P.)
- Institute of Biotechnology, University of Granada, 18071 Granada, Spain
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17
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Philipova I, Stavrakov G, Dimitrov V, Vassilev N. Galantamine derivatives: Synthesis, NMR study, DFT calculations and application in asymmetric catalysis. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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18
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Vassileva M, Malusá E, Eichler-Löbermann B, Vassilev N. Aspegillus terreus: From Soil to Industry and Back. Microorganisms 2020; 8:microorganisms8111655. [PMID: 33113865 PMCID: PMC7692665 DOI: 10.3390/microorganisms8111655] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 10/18/2020] [Accepted: 10/23/2020] [Indexed: 12/18/2022] Open
Abstract
Aspergillus terreus is an important saprophytic filamentous fungus that can be found in soils. Like many other soil microorganisms, A. terreus demonstrates multiple functions and offers various important metabolites, which can be used in different fields of human activity. The first application of A. terreus on an industrial level is the production of itaconic acid, which is now considered as one of the most important bioproducts in the Green Chemistry field. The general schemes for itaconic acid production have been studied, but in this mini-review some lines of future research are presented based on analysis of the published results. A. terreus is also intensively studied for its biocontrol activity and plant growth-promoting effect. However, this microorganism is also known to infect important crops such as, amongst others, rice, wheat, potato, sugar cane, maize, and soybean. It was suggested, however, that the balance between positive vs. negative effects is dependent on the soil-plant-inoculant dose system. A. terreus has frequently been described as an important human pathogen. Therefore, its safety manipulation in biotechnological processes for the production of itaconic acid and some drugs and its use in soil-plant systems should be carefully assessed. Some suggestions in this direction are discussed, particularly concerning the uses in crop production.
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Affiliation(s)
- Maria Vassileva
- Department of Chemical Engineering, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain;
| | - Eligio Malusá
- Research Institute of Horticulture, 96-101 Skierniewice, Poland;
- CREA—Research Centre for Viticulture and Enology, via XXVIII Aprile 26, 31015 Conegliano, Italy
| | - Bettina Eichler-Löbermann
- Institute of Land Use, Faculty of Agriculture and Environmental Sciences, University of Rostock, 18051 Rostock, Germany;
| | - Nikolay Vassilev
- Department of Chemical Engineering, University of Granada, C/Fuentenueva s/n, 18071 Granada, Spain;
- Institute of Biotechnology, University of Granada, 18071 Granada, Spain
- Correspondence:
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Vassilev N, Vassileva M, Martos V, Garcia del Moral LF, Kowalska J, Tylkowski B, Malusá E. Formulation of Microbial Inoculants by Encapsulation in Natural Polysaccharides: Focus on Beneficial Properties of Carrier Additives and Derivatives. Front Plant Sci 2020; 11:270. [PMID: 32211014 PMCID: PMC7077505 DOI: 10.3389/fpls.2020.00270] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Accepted: 02/20/2020] [Indexed: 05/23/2023]
Abstract
In the last 10-15 years, the wide application of bioformulated plant beneficial microorganisms is accepted as an effective alternative of chemical agro-products. Two main problems can be distinguished in their production and application: (a) economical competiveness based on the overall up-stream and down-stream operational costs, and (b) development of commercial products with a high soil-plant colonization potential in controlled conditions but not able to effectively mobilize soil nutrients and/or combat plant pathogens in the field. To solve the above problems, microbe-based formulations produced by immobilization methods are gaining attention as they demonstrate a large number of advantages compared to other solid and liquid formulations. This mini-review summarizes the knowledge of additional compounds that form part of the bioformulations. The additives can exert economical, price-decreasing effects as bulking agents or direct effects improving microbial survival during storage and after introduction into soil with simultaneous beneficial effects on soil and plants. In some studies, combinations of additives are used with a complex impact, which improves the overall characteristics of the final products. Special attention is paid to polysaccharide carriers and their derivates, which play stimulatory role on plants but are less studied. The mini-review also focuses on the potential difficulty in evaluating the effects of complex bio-formulations.
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Affiliation(s)
- Nikolay Vassilev
- Department of Chemical Engineering, Institute of Biotechnology, University of Granada, Granada, Spain
| | - Maria Vassileva
- Department of Chemical Engineering, Institute of Biotechnology, University of Granada, Granada, Spain
| | - Vanessa Martos
- Department of Plant Physiology, University of Granada, Granada, Spain
| | | | - Jolanta Kowalska
- Institute of Plant Protection – National Research Institute, Poznań, Poland
| | - Bartosz Tylkowski
- Chemical Technology Unit, Technology Centre of Catalonia, Tarragona, Spain
| | - Eligio Malusá
- Research Institute of Horticulture, Skierniewice, Poland
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Vassileva M, Flor-Peregrin E, Malusá E, Vassilev N. Towards Better Understanding of the Interactions and Efficient Application of Plant Beneficial Prebiotics, Probiotics, Postbiotics and Synbiotics. Front Plant Sci 2020; 11:1068. [PMID: 32765556 PMCID: PMC7378762 DOI: 10.3389/fpls.2020.01068] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 06/29/2020] [Indexed: 05/07/2023]
Affiliation(s)
- Maria Vassileva
- Department of Chemical Engineering, Institute of Biotechnology, University of Granada, Granada, Spain
| | - Elena Flor-Peregrin
- Department of Chemical Engineering, Institute of Biotechnology, University of Granada, Granada, Spain
| | - Eligio Malusá
- Research Institute of Horticulture, Skierniewice, Poland
| | - Nikolay Vassilev
- Department of Chemical Engineering, Institute of Biotechnology, University of Granada, Granada, Spain
- *Correspondence: Nikolay Vassilev,
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Angelova VT, Pencheva T, Vassilev N, Simeonova R, Momekov G, Valcheva V. New indole and indazole derivatives as potential antimycobacterial agents. Med Chem Res 2019. [DOI: 10.1007/s00044-019-02293-w] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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22
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Vassilev N, Eichler-Löbermann B, Flor-Peregrin E, Martos V, Reyes A, Vassileva M. Production of a potential liquid plant bio-stimulant by immobilized Piriformospora indica in repeated-batch fermentation process. AMB Express 2017; 7:106. [PMID: 28549373 PMCID: PMC5445041 DOI: 10.1186/s13568-017-0408-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 05/22/2017] [Indexed: 11/18/2022] Open
Abstract
Piriformospora indica, a mycorrhizal-like fungus able to establish associations with roots of a wide range of plants, supporting plant nutrition and increasing plant resistance and tolerance to stress, was shown to solubilise phosphate applied in the form of animal bone char (HABO) in fermentation systems. The process of P solubilisation was caused most likely by proton extrusion and medium pH lowering. The fungal mycelium was successfully immobilized/retained in a polyurethane foam carrier. Further employment of the immobilized mycelium in repeated-batch fermentation process resulted in at least 5 cycles of P solubilization. The concentration of soluble P increased during the experiment with 1.0 and 3.0 g HABO l−1 and at the end of the 5th batch cycle reached 40.8 and 120 mg l−1, respectively. The resulting final liquid product, without or with solubilized phosphate, was found to significantly increase plant growth and P plant uptake. It can be used as a biostimulant containing microbial plant growth-promoting substances and soluble P derived from renewable sources (HABO) thus supporting the development of sustainable agro-ecosystems.
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Angelova VT, Valcheva V, Pencheva T, Voynikov Y, Vassilev N, Mihaylova R, Momekov G, Shivachev B. Synthesis, antimycobacterial activity and docking study of 2-aroyl-[1]benzopyrano[4,3-c]pyrazol-4(1H)-one derivatives and related hydrazide-hydrazones. Bioorg Med Chem Lett 2017; 27:2996-3002. [PMID: 28512022 DOI: 10.1016/j.bmcl.2017.05.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 05/03/2017] [Accepted: 05/04/2017] [Indexed: 12/30/2022]
Abstract
A new convenient method for preparation of 2-aroyl-[1]benzopyrano[4,3-c]pyrazol-4(1H)-one derivatives 5b-g and coumarin containing hydrazide-hydrazone analogues 4a-e was presented. The antimycobacterial activity against reference strain Mycobacterium tuberculosis H37Rv and cytotoxicity against the human embryonic kidney cell line HEK-293 were tested in vitro. All compounds demonstrated significant minimum inhibitory concentrations (MIC) ranging 0.28-1.69μM, which were comparable to those of isoniazid. The cytotoxicity (IC50>200µM) to the "normal cell" model HEK-293T exhibited by 2-aroyl-[1]benzopyrano[4,3-c]pyrazol-4(1H)-one derivatives 5b-e, was noticeably milder compared to that of their hydrazone analogues 4a-e (IC50 33-403µM). Molecular docking studies on compounds 4a-e and 5b-g were also carried out to investigate their binding to the 2-trans-enoyl-ACP reductase (InhA) enzyme involved in M. tuberculosis cell wall biogenesis. The binding model suggested one or more hydrogen bonding and/or arene-H or arene-arene interactions between hydrazones or pyrazole-fused coumarin derivatives and InhA enzyme for all synthesized compounds.
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Affiliation(s)
- Violina T Angelova
- Faculty of Pharmacy, Medical University of Sofia, 2 Dunav Str., 1000 Sofia, Bulgaria.
| | - Violeta Valcheva
- "Stefan Angelov" Institute of Microbiology, Bulgarian Academy of Sciences, 26 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria
| | - Tania Pencheva
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, 105 Acad. G. Bonchev Str, 1113 Sofia, Bulgaria
| | - Yulian Voynikov
- Faculty of Pharmacy, Medical University of Sofia, 2 Dunav Str., 1000 Sofia, Bulgaria
| | - Nikolay Vassilev
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Rositsa Mihaylova
- Faculty of Pharmacy, Medical University of Sofia, 2 Dunav Str., 1000 Sofia, Bulgaria
| | - Georgi Momekov
- Faculty of Pharmacy, Medical University of Sofia, 2 Dunav Str., 1000 Sofia, Bulgaria
| | - Boris Shivachev
- Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 107 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria
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Vassilev N, Malusa E, Requena AR, Martos V, López A, Maksimovic I, Vassileva M. Potential application of glycerol in the production of plant beneficial microorganisms. J Ind Microbiol Biotechnol 2016; 44:735-743. [PMID: 27514665 DOI: 10.1007/s10295-016-1810-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Accepted: 07/30/2016] [Indexed: 12/24/2022]
Abstract
This review highlights the importance of research for development of biofertilizer and biocontrol products based on the use of glycerol for further process scale-up to industrial microbiology. Glycerol can be used successfully in all stages of production of plant beneficial microorganisms. It serves as an excellent substrate in both submerged and solid-state fermentation processes with free and immobilized microbial cells. Glycerol is also one of the most attractive formulation agents that ensures high cell density and viability including in harsh environmental conditions. Future research is discussed to make this inexpensive material a base for industrial production of plant beneficial microorganisms.
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Affiliation(s)
- Nikolay Vassilev
- Institute of Biotechnology, University of Granada, Granada, Spain. .,Department of Chemical Engineering, University of Granada, c/Fuentenueva s/n, 18071, Granada, Spain.
| | - Eligio Malusa
- Unit of Turin, CRA-Centre for Plant-Soil Systems, Turin, Italy
| | | | - Vanessa Martos
- Institute of Biotechnology, University of Granada, Granada, Spain
| | - Ana López
- Institute of Biotechnology, University of Granada, Granada, Spain
| | | | - Maria Vassileva
- Institute of Biotechnology, University of Granada, Granada, Spain
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Karadaev M, Fasulkov I, Vassilev N, Petrova Y, Tumbev A, Petelov Y. Ultrasound monitoring of the first trimester of pregnancy in local goats through visualisation and measurements of some biometric parameters. BJVM 2016. [DOI: 10.15547/bjvm.909] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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26
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Atanassova M, Vassilev N, Tashev E, Lachkova V, Varbanov S. Coordination chemistry of a para-tert-octylcalix[4]arene fitted with phosphinoyl pendant arms towards 4f-elements: Extraction, synergism, separation. SEP SCI TECHNOL 2015. [DOI: 10.1080/01496395.2015.1078358] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
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27
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Vassilev N, Vassileva M, Lopez A, Martos V, Reyes A, Maksimovic I, Eichler-Löbermann B, Malusà E. Unexploited potential of some biotechnological techniques for biofertilizer production and formulation. Appl Microbiol Biotechnol 2015. [PMID: 25957155 DOI: 10.1007/s00253-015-6656-6654] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2023]
Abstract
The massive application of chemical fertilizers to support crop production has resulted in soil, water, and air pollution at a global scale. In the same time, this situation escalated consumers' concerns regarding quality and safety of food production which, due to increase of fertilizer prices, have provoked corresponding price increase of food products. It is widely accepted that the only solution is to boost exploitation of plant-beneficial microorganisms which in conditions of undisturbed soils play a key role in increasing the availability of minerals that otherwise are inaccessible to plants. This review paper is focused on the employment of microbial inoculants and their production and formulation. Special attention is given to biotechniques that are not fully exploited as tools for biofertilizer manufacturing such as microbial co-cultivation and co-immobilization. Another emerging area includes biotechnological production and combined usage of microorganisms/active natural compounds (biostimulants) such as plant extracts and exudates, compost extracts, and products like strigolactones, which improve not only plant growth and development but also plant-microbial interactions. The most important potential and novel strategies in this field are presented as well as the tendencies that will be developed in the near future.
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Affiliation(s)
- N Vassilev
- Institute of Biotechnology, University of Granada, Granada, Spain,
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28
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Vassilev N, Vassileva M, Lopez A, Martos V, Reyes A, Maksimovic I, Eichler-Löbermann B, Malusà E. Unexploited potential of some biotechnological techniques for biofertilizer production and formulation. Appl Microbiol Biotechnol 2015; 99:4983-96. [DOI: 10.1007/s00253-015-6656-4] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 04/26/2015] [Accepted: 04/27/2015] [Indexed: 11/24/2022]
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29
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Philipova I, Stavrakov G, Vassilev N, Nikolova R, Shivachev B, Dimitrov V. Cytisine as a scaffold for ortho-diphenylphosphinobenzenecarboxamide ligands for Pd-catalyzed asymmetric allylic alkylation. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2014.12.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
The extensive research, production and use of microorganisms to improve plant nutrition have resulted in an inconsistent definition of the term "biofertiliser" which, in some cases, is due to the different microbial mechanisms involved. The rationale for adopting the term biofertiliser is that it derives from "biological fertiliser", that, in turn, implies the use of living microorganisms. Here, we propose a definition for this kind of products which is distinguishing them from biostimulants or other inorganic and organic fertilisers. Special emphasis is given to microorganism(s) with multifunctional properties and biofertilisers containing more than one microorganism. This definition could be included in legal provisions regulating registration and marketing requirements. A set of rules is also proposed which could guarantee the quality of biofertilisers present on the market and thus foster their use by farmers.
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Affiliation(s)
- E Malusá
- Research Institute of Horticulture, ul. Pomologiczna 18, 96-100, Skierniewice, Poland,
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31
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Vassilev N, Eichler-Löbermann B, Martos V, Vassileva M. Solubilization of animal bone char by Yarrowia lipolytica on medium containing glycerol. N Biotechnol 2014. [DOI: 10.1016/j.nbt.2014.05.989] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ivanov IC, Angelova VT, Vassilev N, Tiritiris I, Iliev B. Synthesis of 4-Aminocoumarin Derivatives with N-Substitutents Containing Hydroxy or Amino Groups. ACTA ACUST UNITED AC 2014. [DOI: 10.5560/znb.2013-3102] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Reactions of 4-hydroxycoumarin (1a) and 4-chlorocoumarin-3-carbaldehyde (1b) with amino alcohols or alkylene diamines led to the formation of the corresponding N-substituted 4-aminocoumarins 3, 5 and 6. However, 4-hydroxycoumarin-3-carbaldehyde (8) reacted with 2-aminoethanol and ethylenediamine to give N-substituted 3-(aminomethylene)-chromane-2,4-diones 9a, b. The structure and the E-configuration of compound 6 were proven by X-ray crystal structure analysis. Products 9a, b displayed signals of both E- and Z-isomers in their NMR spectra. All novel products have been characterized by means of spectral (IR, NMR, MS) data and elemental analyses
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Affiliation(s)
- Ivo C. Ivanov
- Faculty of Pharmacy, Medical University of Sofia, Dunav 2, BG-1000 Sofia, Bulgaria
| | - Violina T. Angelova
- Faculty of Pharmacy, Medical University of Sofia, Dunav 2, BG-1000 Sofia, Bulgaria
| | - Nikolay Vassilev
- Institute of Organic Chemistry with Centre of Phytochemistry, Acad. G. Bonchev St. 9, BG-1113 Sofia, Bulgaria
| | - Ioannis Tiritiris
- University of Applied Sciences, Beethovenstr. 1, D-73631 Aalen, Germany d Ionic Liquids Technologies GmbH, Salzstrasse 184, D-74076 Heilbronn, Germany
| | - Boyan Iliev
- Ionic Liquids Technologies GmbH, Salzstrasse 184, D-74076 Heilbronn, Germany
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Kovachev S, Nacheva A, Ganovska A, Ivanov A, Gigov P, Vassilev N. [Secondary non-Hodgkin lymphoma of female genital tract]. Akush Ginekol (Sofiia) 2014; 53:41-45. [PMID: 25679035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Non-Hodgkin Lymphomas (NHL) are a separate group of blood diseases, which includes all types of lymphomas, without Hodgkin lymphomas. The incidence of NHL in the female genital system is 0.5% of all the NHL. They develop in the female genital organs primary or affect them secondary. Secondary development of the genital non-Hodgkin's lymphoma we have when the biopsy of a lymph node that precedes the diagnosis of the disease is before the development of a genital tumor or we can find a genital tumor--along with simultaneous involvement of the lymph nodes or extra genital authority. We present a clinical case of 56 years patient with non-Hodgkin's lymphoma with secondary genital involvement. From ultrasonography, computed axial tomography and Tu markers that were maiden we have suspicion for ovarian tumor with mechanical pressure over pyelocalix system due to left hidroureter and left hydronephrosis II degree. That was the only reason for urgent surgical treatment with intraoperative histologic diagnosis of NHL. The postoperative chemotherapy in combination with surgical treatment in our case had a good and long-lasting disease survivor effect. One year after the operation and the chemotherapy in the patient, there is no evidence of relapse.
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Troev K, Todorov P, Naydenova E, Mitova V, Vassilev N. A Study of the Reaction of Phosphorus Trichloride with Paraformaldehyde in the Presence of Carboxylic Acids. PHOSPHORUS SULFUR 2013. [DOI: 10.1080/10426507.2012.745078] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- K. Troev
- a Institute of Polymers , Bulgarian Academy of Sciences , Sofia , Bulgaria
| | - P. Todorov
- b Department of Organic Chemistry , University of Chemical Technology and Metallurgy , Sofia , Bulgaria
| | - E. Naydenova
- b Department of Organic Chemistry , University of Chemical Technology and Metallurgy , Sofia , Bulgaria
| | - V. Mitova
- a Institute of Polymers , Bulgarian Academy of Sciences , Sofia , Bulgaria
| | - N. Vassilev
- c Institute of Organic Chemistry with Centre of Phytochemistry , Bulgarian Academy of Sciences , Sofia , Bulgaria
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Vassilev N, Martos E, Mendes G, Martos V, Vassileva M. Biochar of animal origin: a sustainable solution to the global problem of high-grade rock phosphate scarcity? J Sci Food Agric 2013; 93:1799-804. [PMID: 23504602 DOI: 10.1002/jsfa.6130] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2012] [Revised: 02/14/2013] [Accepted: 03/15/2013] [Indexed: 05/23/2023]
Abstract
Phosphorus (P) is an essential element for all living organisms. However, in soil-plant systems, this nutrient is the most limiting, leading to frequent applications of soluble P fertilisers. Their excessive use provokes alterations in the natural P cycle, soil biodiversity and ecological equilibrium and is the main reason for the eutrophication of water, with consequences on food safety. Biotechnology offers a number of sustainable solutions that can mitigate these problems by using various waste materials as a source of P and, on the other hand, their solubilisation by selected micro-organisms. This review present results on the solubilisation of animal bone char with high phosphate content by micro-organisms to produce organic acids such as lactic acid, citric acid and itaconic acid. All experiments were performed under conditions of liquid submerged and solid state fermentation processes. Freely suspended and immobilised cells of the corresponding microbial cultures were employed using substrates characterised by low cost and abundance. Other alternative technologies are discussed as well in order to stimulate further studies in this field, bearing in mind the progressive increase in P fertiliser prices based on high global P consumption and the scarcity of rock phosphate reserves.
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Affiliation(s)
- Nikolay Vassilev
- Department of Chemical Engineering, University of Granada, Granada, Spain; Institute of Biotechnology, University of Granada, Granada, Spain.
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Vassilev N, Slavchev B, Nacheva A. [Cervical intraepithelial neoplasia: an attempt to propose rules for good medical practice]. Akush Ginekol (Sofiia) 2013; 52:44-52. [PMID: 24283080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The authors emphasize the advantages of the term "cervical intraepithelial neoplasia" (CIN) over "dysplasia" and "carcinoma-in-situ". The rules for good medical practice in treating CIN are based on several starting points, namely: proven role of the human papillomavirus (HPV) in the development of CIN; current possibilities to diagnose and to prevent HPV infections; morphological stigmata of CIN within the epithelium; possibilities to treat CIN and lack of possibilities to treat HPV infection; assessment of the patient 's reproductive potential. In recent cases of CIN1 the history of anti-HPV vaccination is an important factor in choosing the best treatment protocol. In cases of persistent CIN1 treatment protocols are influenced by the presence/absence of high-risk types of HPV. In recent cases of CIN2 treatment protocols vary according to the extent of the lesion, as well as its penetration within the cervical canal. The latter sign is of foremost importance in recent cases of CIN3. Treatment protocols for all the above mentioned conditions, for persistent CIN2 and CIN3,as well as for post-treatment recurrences are presented in flow chart form. Patients' age and reproductive potential should be taken into consideration in selected cases of CIN2+. CIN in pregnant patients deserves a more conservative approach.
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Vassilev N, Eichler-Löbermann B, Vassileva M. Stress-tolerant P-solubilizing microorganisms. Appl Microbiol Biotechnol 2012; 95:851-9. [DOI: 10.1007/s00253-012-4224-8] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2012] [Revised: 05/29/2012] [Accepted: 05/30/2012] [Indexed: 11/25/2022]
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Vassileva M, Eichler-Lobermann B, Reyes A, Vassilev N. Animal bones char solubilization by gel-entrapped Yarrowia lipolytica on glycerol-based media. ScientificWorldJournal 2012; 2012:907143. [PMID: 22645462 PMCID: PMC3356734 DOI: 10.1100/2012/907143] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Accepted: 12/21/2011] [Indexed: 12/03/2022] Open
Abstract
Citric acid was produced with free and k-carrageenan-entrapped cells of the yeast Yarrowia lipolytica in single and repeated batch-shake-flask fermentations on glycerol-based media. Simultaneous solubilization of hydroxyapatite of animal bone origin (HABO) was tested in all experiments. The highest citric acid production by free yeast cells of 20.4 g/L and 18.7 g/L was reached after 96 h of fermentation in the absence and presence of 3 g/L HABO, respectively. The maximum values for the same parameter achieved by gel-entrapped cells in conditions of single batch and repeated-batch fermentation processes were 18.7 g/L and 28.1 g/L registered after 96 h and the 3d batch cycle, respectively. The highest citric acid productivity of 0.58 g L−1 h−1 was obtained with immobilized cells in repeated batch mode of fermentation when the added hydroxyapatite of 3 g/L was solubilized to 399 mg/L whereas the maximum efficiency of 89.0% was obtained with 1 g/L of HABO.
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Affiliation(s)
- Maria Vassileva
- Department of Chemical Engineering, Faculty of Sciences, University of Granada, 18071 Granada, Spain.
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Affiliation(s)
- S. Bayryamov
- a Institute of Organic Chemistry , Bulgarian Academy of Sciences , Sofia, Bulgaria
| | - D. Danalev
- b Department of Organic Chemistry , University of Chemical Technology and Metallurgy , Sofia, Bulgaria
| | - N. Vassilev
- a Institute of Organic Chemistry , Bulgarian Academy of Sciences , Sofia, Bulgaria
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Mavrova AT, Vuchev D, Anichina K, Vassilev N. Synthesis, antitrichinnellosis and antiprotozoal activity of some novel thieno[2,3-d]pyrimidin-4(3H)-ones containing benzimidazole ring. Eur J Med Chem 2010; 45:5856-61. [PMID: 20950896 DOI: 10.1016/j.ejmech.2010.09.050] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2010] [Revised: 09/20/2010] [Accepted: 09/21/2010] [Indexed: 10/19/2022]
Abstract
Some novel thieno[2,3-d]pyrimidin-4(3H)-ones containing benzimidazol-2-yl-thioethyl- and benzimidazol-2-yl-methanethioethyl moiety in second position of the pyrimidine ring were synthesized in order to determine their antitrichinellosis and antiprotozoal effects. The structures of the compounds were confirmed by IR, (1)H NMR and elemental analysis. The antiparasitic screening showed that the benzimidazole derivatives of thieno[2,3-d]pyrimidin-4(3H)-ones exhibited higher activity against Trichinella spiralis in vitro in comparison albendazole. The most active compound, 2-[2-(5-nitro-1H-benzimidazol-1-yl)ethyl]-5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidin-4(3H)-one 22 revealed 95% activity at a dosage of 5 mg/kg mw after 24 h, while compounds 8 and 10 applied at the same dose showed efficacy of 90% after 48 h. The compound 2-{2-[(5(6)-nitro-1H-benzimidazol-2-yl)thio]ethyl}-5,6,7,8-tetrahydro[1]-benzothieno[2,3-d]pyrimidin-4(3H)-one 11 exhibited 90% efficacy after 24 h. The pharmaco-therapeutic study in vivo on invaded with Lamblia muris white mice showed 100% effectiveness of the compounds 8, 10, 11, 13-15 and 22, 23 after five-days-treatment course.
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Affiliation(s)
- Anelia Ts Mavrova
- Department of Organic Synthesis, University of Chemical Technology and Metallurgy, 8Kliment Ohridski Blvd., 1756 Sofia, Bulgaria.
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Vassileva M, Serrano M, Bravo V, Jurado E, Nikolaeva I, Martos V, Vassilev N. Multifunctional properties of phosphate-solubilizing microorganisms grown on agro-industrial wastes in fermentation and soil conditions. Appl Microbiol Biotechnol 2010. [PMID: 19946684 DOI: 10.1007/s00253-009-2366-2360] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
One of the most studied approaches in solubilization of insoluble phosphates is the biological treatment of rock phosphates. In recent years, various techniques for rock phosphate solubilization have been proposed, with increasing emphasis on application of P-solubilizing microorganisms. The P-solubilizing activity is determined by the microbial biochemical ability to produce and release metabolites with metal-chelating functions. In a number of studies, we have shown that agro-industrial wastes can be efficiently used as substrates in solubilization of phosphate rocks. These processes were carried out employing various technologies including solid-state and submerged fermentations including immobilized cells. The review paper deals critically with several novel trends in exploring various properties of the above microbial/agro-wastes/rock phosphate systems. The major idea is to describe how a single P-solubilizing microorganism manifests wide range of metabolic abilities in different environments. In fermentation conditions, P-solubilizing microorganisms were found to produce various enzymes, siderophores, and plant hormones. Further introduction of the resulting biotechnological products into soil-plant systems resulted in significantly higher plant growth, enhanced soil properties, and biological (including biocontrol) activity. Application of these bio-products in bioremediation of disturbed (heavy metal contaminated and desertified) soils is based on another important part of their multifunctional properties.
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Affiliation(s)
- Maria Vassileva
- Department of Chemical Engineering, Faculty of Sciences, University of Granada, Granada 18071, Spain
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Vassileva M, Serrano M, Bravo V, Jurado E, Nikolaeva I, Martos V, Vassilev N. Multifunctional properties of phosphate-solubilizing microorganisms grown on agro-industrial wastes in fermentation and soil conditions. Appl Microbiol Biotechnol 2009; 85:1287-99. [PMID: 19946684 DOI: 10.1007/s00253-009-2366-0] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2009] [Revised: 11/14/2009] [Accepted: 11/15/2009] [Indexed: 11/28/2022]
Abstract
One of the most studied approaches in solubilization of insoluble phosphates is the biological treatment of rock phosphates. In recent years, various techniques for rock phosphate solubilization have been proposed, with increasing emphasis on application of P-solubilizing microorganisms. The P-solubilizing activity is determined by the microbial biochemical ability to produce and release metabolites with metal-chelating functions. In a number of studies, we have shown that agro-industrial wastes can be efficiently used as substrates in solubilization of phosphate rocks. These processes were carried out employing various technologies including solid-state and submerged fermentations including immobilized cells. The review paper deals critically with several novel trends in exploring various properties of the above microbial/agro-wastes/rock phosphate systems. The major idea is to describe how a single P-solubilizing microorganism manifests wide range of metabolic abilities in different environments. In fermentation conditions, P-solubilizing microorganisms were found to produce various enzymes, siderophores, and plant hormones. Further introduction of the resulting biotechnological products into soil-plant systems resulted in significantly higher plant growth, enhanced soil properties, and biological (including biocontrol) activity. Application of these bio-products in bioremediation of disturbed (heavy metal contaminated and desertified) soils is based on another important part of their multifunctional properties.
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Affiliation(s)
- Maria Vassileva
- Department of Chemical Engineering, Faculty of Sciences, University of Granada, Granada 18071, Spain
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Petrov P, Vassilev N, Angelova S, Shivachev B, Petrov G. Mechanism and Stereoselectivity of the Phosphinylation of 3-Acyl Coumarins-Stereocontrol Via Concurrent Aromatic Interaction/Oxaphosphole Formation. LETT ORG CHEM 2009. [DOI: 10.2174/157017809787582825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Danalev D, Koleva M, Ivanova D, Vezenkov L, Vassilev N. Synthesis of Two Peptide Mimetics as Markers for Chemical Changes of Wools Keratin During Skin Unhairing Process. Protein Pept Lett 2008; 15:353-5. [DOI: 10.2174/092986608784246489] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Denkova P, Vassilev N, Van Lokeren L, Willem R. Investigation of the dynamic stereochemistry of dimesityl-2,4,6-trimethoxyphenylmethane by complete lineshape analysis and 2D EXSY NMR spectroscopy. Magn Reson Chem 2008; 46:362-369. [PMID: 18273867 DOI: 10.1002/mrc.2183] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The static and dynamic stereochemistry of dimesityl-2,4,6-trimethoxyphenylmethane in solution was investigated by lineshape analysis of 1D NMR spectra and cross-peak amplitude processing in 2D EXSY spectra, recorded at variable temperatures. Previous studies on this propeller-shaped chiral compound show that the stereomer threshold interconversion is associated with helicity reversal and occurs through [1,2]- and [1,3]-two ring flips of one mesityl and the 2,4,6-trimethoxyphenyl rings. In the present study, the experimental rate constants of the [1,2]- and [1,3]-two ring flips, which are identical, were determined at various temperatures by combining quantitative 2D EXSY spectra processing and complete lineshape analysis (CLSA) of 1D NMR spectra. The latter were subjected to reference deconvolution and linear prediction in order to eliminate the lineshape distortions due to magnetic field inhomogeneity. The activation parameters of these ring flips were determined by an Eyring equation analysis of the temperature dependence of the rate constant. The experimentally determined activation enthalpy and entropy for the two-ring flips, and those obtained from theoretical ab initio calculations at different levels of theory and basis sets, were found to be in good agreement.
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Affiliation(s)
- Pavletta Denkova
- NMR Laboratory, Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences; Acad. G. Bontchev Str., Bl.9, 1113 Sofia, Bulgaria.
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Vassilev N, Nikolaeva I, Vassileva M. INDOLE-3-ACETIC ACID PRODUCTION BY GEL-ENTRAPPEDBACILLUS THURINGIENSISIN THE PRESENCE OF ROCK PHOSPHATE ORE. CHEM ENG COMMUN 2007. [DOI: 10.1080/00986440600983486] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Bonev G, Wehrend A, Vassilev N, Georgiev P, Dimitrov M, Yotov S. Sensitivität, Spezifität und Genauigkeit der transrektalen sonographischen Frühträchtigkeitsdiagnostik beim Schaf. Tierarztl Prax Ausg G Grosstiere Nutztiere 2007. [DOI: 10.1055/s-0037-1621641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Zusammenfassung
Gegenstand und Ziel: Überprüfung der Sensitivität, Spezifität und Genauigkeit der transrektalen sonographischen Frühträchtigkeitsuntersuchung beim Schaf. Material und Methode: Die Untersuchung erfolgte an 126 Schafen der Rasse Pleven Black Head. Die in drei Untersuchungsgruppen (je n = 42) eingeteilten Tiere wurden mittels gestagenhaltiger Vaginalspangen und Gabe von 500 IE eCG zyklussynchronisiert. Es folgte eine laparoskopische Besamung mit aufgetautem Tiefgefriersperma 54–56 Stunden nach Entfernung der Vaginalspangen. Die transrektale sonographische Trächtigkeitsdiagnose (5 MHz) wurde 20 Tage (Gruppe 1), 25 Tage (Gruppe 2) bzw. 30 Tage (Gruppe 3) später durchgeführt. Die Resultate der sonographischen Trächtigkeitsdiagnostik wurden mit den Ablammergebnissen verglichen. Ergebnisse: Genauigkeit, Sensitivität und Spezifität ergaben sich wie folgt: Gruppe 1: 76,2%, 93,3% und 33,3%; Gruppe 2: 80,9%, 90,6% und 50%; Gruppe 3: 87,8%, 94,4% und 40%. Schlussfolgerung: Die transrektale Sonographie zur frühen Graviditätsdiagnose sollte beim Schaf am 30. Tag der Trächtigkeit durchgeführt werden.
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Atanassova M, Lachkova V, Vassilev N, Varbanov S, Dukov I. Effect of p-tert-Butylcalix[4]arene Fitted with Phosphinoyl Pendant Arms as Synergistic Agent in the Solvent Extraction and Separation of Some Trivalent Lanthanoids with 4-Benzoyl-3-methyl-1-phenyl-5-pyrazolone. J INCL PHENOM MACRO 2006. [DOI: 10.1007/s10847-006-9140-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Vassilev N, Vassileva M, Nikolaeva I. Simultaneous P-solubilizing and biocontrol activity of microorganisms: potentials and future trends. Appl Microbiol Biotechnol 2006; 71:137-44. [PMID: 16544140 DOI: 10.1007/s00253-006-0380-z] [Citation(s) in RCA: 134] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2005] [Revised: 02/14/2006] [Accepted: 02/15/2006] [Indexed: 10/24/2022]
Abstract
Phosphate (P)-solubilizing microorganisms as a group form an important part of the microorganisms, which benefit plant growth and development. Growth promotion and increased uptake of phosphate are not the only mechanisms by which these microorganisms exert a positive effect on plants. Microbially mediated solubilization of insoluble phosphates through release of organic acids is often combined with production of other metabolites, which take part in biological control against soilborne phytopathogens. In vitro studies show the potential of P-solubilizing microorganisms for the simultaneous synthesis and release of pathogen-suppressing metabolites, mainly siderophores, phytohormones, and lytic enzymes. Further trends in this field are discussed, suggesting a number of biotechnological approaches through physiological and biochemical studies using various microorganisms.
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Affiliation(s)
- Nikolay Vassilev
- Department of Chemical Engineering, Faculty of Sciences, University of Granada, Spain.
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Medina A, Vassilev N, Barea JM, Azcón R. Application of Aspergillus niger-treated agrowaste residue and Glomus mosseae for improving growth and nutrition of Trifolium repens in a Cd-contaminated soil. J Biotechnol 2005; 116:369-78. [PMID: 15748763 DOI: 10.1016/j.jbiotec.2004.12.009] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2004] [Revised: 12/15/2004] [Accepted: 12/20/2004] [Indexed: 11/26/2022]
Abstract
The microbial transformation of sugar beet (SB) agrowaste with or without rock-phosphate (RP) has utility for the improvement of plant growth in a Cd (5 microg g-1) artificially contaminated soil, particularly when the soil is co-inoculated with arbuscular mycorrhizal (AM) fungus Glomus mosseae isolated from a Cd-polluted area. Under such Cd-polluted conditions, the limited growth, mineral nutrition, symbiotic developments (nodulation and AM-colonization) and soil enzymatic activities were stimulated using SB or SB+RP as soil amendments and G. mosseae as inoculant. G. mosseae enhanced plant establishment in a higher extent in amended soil; it is probably due to the interactive effect increasing the potential fertility of such compounds and its ability for decreasing Cd transfer from soil to plant. The amount of Cd transferred from soil solution to biomass of AM-colonized plants ranged from 0.09 microg Cd g-1 (in SB+RP-amended soil) to 0.6 microg Cd g-1 (in non-amended soil). Nodule formation was more sensitive to Cd than AM-colonization, and both symbioses were stimulated in amended soils. Not only AM-colonization but also amendments were critical for plant growth and nutrition in Cd-polluted soil. The high effectiveness of AM inoculum increasing nutrients and decreasing Cd in amended soil indicated the positive interaction of these treatments in increasing plant tolerance to Cd contamination.
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Affiliation(s)
- A Medina
- Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, CSIC, Profesor Albareda 1, 18008 Granada, Spain
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