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Noguchi T, Hirao M, Okamura G, Etani Y, Ebina K, Tsuboi H, Goshima A, Miyama A, Takahi K, Takami K, Tsuji S, Okada S, Hashimoto J. Stabilizing effect of total ankle arthroplasty by distal translation and lateralization of talus in varus ankle deformity. Musculoskelet Surg 2024:10.1007/s12306-024-00820-6. [PMID: 38705948 DOI: 10.1007/s12306-024-00820-6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 03/23/2024] [Indexed: 05/07/2024]
Abstract
BACKGROUND In end-stage arthritis indicated for total ankle arthroplasty (TAA), full-thickness cartilage damage, subchondral bone defect/shaving, and fluttering of the talar dome occur, shortening the distance between the tibial and talar insertions of ligaments and leading to laxity of ligaments surrounding the ankle joint. Under such conditions, medial ligaments (including the deltoid ligament) would not be expected to function properly. To stabilize the ankle joint during the stance phase, medial ligament function under tension is important. This study therefore examined whether TAA contributes to lengthening of the medial tibio-talar joint as evaluated radiographically, as a preferable method for achieving tensile effects on medial ligaments. MATERIALS AND METHODS Twenty-four feet with end-stage varus deformity of the ankle joint that underwent TAA were retrospectively investigated, excluding cases with any malleolar osteotomy or fracture. Distance between proximal and distal insertions of medial ligaments, lateralization of the talus, and talar tilt angle under valgus/varus stress condition were evaluated pre- and postoperatively. RESULTS Distance between proximal and distal insertions of medial ligaments was significantly elongated after TAA. At the same time, the talus showed significant lateralization. Furthermore, talar tilt under valgus/varus stress conditions was also significantly reduced after TAA. CONCLUSION TAA affects distal translation and lateralization of the talus in cases of varus ankle deformity. These effects might contribute to re-providing tensile force on lax medial ligaments, improving ligament function.
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Affiliation(s)
- T Noguchi
- Department of Orthopaedic Surgery, Osaka Minami Medical Center, National Hospital Organization, 2-1 Kidohigashi, Kawachinagano, Osaka, 586-8521, Japan
| | - M Hirao
- Department of Orthopaedic Surgery, Osaka Minami Medical Center, National Hospital Organization, 2-1 Kidohigashi, Kawachinagano, Osaka, 586-8521, Japan.
| | - G Okamura
- Department of Orthopaedic Surgery, Osaka Minami Medical Center, National Hospital Organization, 2-1 Kidohigashi, Kawachinagano, Osaka, 586-8521, Japan
| | - Y Etani
- Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - K Ebina
- Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - H Tsuboi
- Department of Orthopaedic Surgery, Osaka Rosai Hospital, Osaka, Japan
| | - A Goshima
- Department of Orthopaedic Surgery, Osaka Rosai Hospital, Osaka, Japan
| | - A Miyama
- Department of Orthopaedic Surgery, Osaka-Toneyama Medical Center, National Hospital Organization, Osaka, Japan
| | - K Takahi
- Department of Orthopaedic Surgery, Osaka-Toneyama Medical Center, National Hospital Organization, Osaka, Japan
| | - K Takami
- Department of Orthopaedic Surgery, Nippon Life Hospital, Osaka, Japan
| | - S Tsuji
- Department of Orthopaedic Surgery, Nippon Life Hospital, Osaka, Japan
| | - S Okada
- Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - J Hashimoto
- Department of Orthopaedic Surgery, Osaka Minami Medical Center, National Hospital Organization, 2-1 Kidohigashi, Kawachinagano, Osaka, 586-8521, Japan
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Tyutyunov Y, Sen D, Banerjee M. Does mutual interference stabilize prey-predator model with Bazykin-Crowley-Martin trophic function? Math Biosci 2024; 372:109201. [PMID: 38636925 DOI: 10.1016/j.mbs.2024.109201] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 03/10/2024] [Accepted: 04/12/2024] [Indexed: 04/20/2024]
Abstract
We investigated a system of ordinary differential equations that describes the dynamics of prey and predator populations, taking into account the Allee effect affecting the reproduction of the predator population, and mutual interference amongst predators, which is modeled with the Bazykin-Crowley-Martin (BCM) trophic function. Bifurcation analysis revealed a rich spectrum of bifurcations occurring in the system. In particular, analytical conditions for the saddle-node, Hopf, cusp, and Bogdanov-Takens bifurcations were derived for the model parameters, quantifying the strength of the predator interference, the Allee effect, and the predation efficiency. Numerical simulations verify and illustrate the analytical findings. The main purpose of the study was to test whether the mutual interference in the model with BCM trophic function provides a stabilizing or destabilizing effect on the system dynamics. The obtained results suggest that the model demonstrates qualitatively the same pattern concerning varying the interference strength as other predator-dependent models: both low and very high interference levels increase the risk of predator extinction, while moderate interference has a favorable effect on the stability and resilience of the prey-predator system.
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Affiliation(s)
- Yuri Tyutyunov
- Southern Scientific Centre of the Russian Academy of Sciences, 41 Chekhov St., Rostov-on-Don, 344006, Russia.
| | - Deeptajyoti Sen
- Department of Mathematics & Statics, Faculty of Science, Masaryk University, Kotlářská 2, Brno, 60200, Czech Republic
| | - Malay Banerjee
- Department of Mathematics & Statics, IIT Kanpur, Kalyanpur, 208016, Uttar Pradesh, India
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Liu SY, Xie JG, Chen XW, Chen DF. Dunaliella Ds-26-16 acts as a global regulator to enhance salt tolerance by coordinating multiple responses in Arabidopsis seedlings. Planta 2023; 257:110. [PMID: 37149499 DOI: 10.1007/s00425-023-04149-5] [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] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 04/28/2023] [Indexed: 05/08/2023]
Abstract
MAIN CONCLUSION Based on phenotypic, physiological and proteomic analysis, the possible mechanism by which Ds-26-16 regulates salt tolerance in Arabidopsis seedlings was revealed. Functional and mechanistic characterization of salt tolerance genes isolated from natural resources is crucial for their application. In this study, we report the possible mechanism by which Ds-26-16, a gene from Dunaliella, and its point mutation gene EP-5, enhance salt tolerance in Arabidopsis seedlings. Both Ds-26-16 and EP-5 transgenic lines displayed higher seed germination rates, cotyledon-greening rates, soluble sugar contents, decreased relative conductivity and ROS accumulation when germinating under 150 mM NaCl conditions. Comparative proteomic analysis revealed that there were 470 or 391 differentially expressed proteins (DEPs) in Ds-26-16 or EP-5, respectively, compared with the control (3301) under salt stress. The GO and KEGG enrichment analyses showed the DEPs in Ds-26-16 vs. 3301 and EP-5 vs. 3301 were similar and mainly enriched in photosynthesis, regulation of gene expression, carbohydrate metabolism, redox homeostasis, hormonal signal and defense, and regulation of seed germination. Thirty-seven proteins were found to be stably expressed under salt stress due to the expression of Ds-26-16, and eleven of them contain the CCACGT motif which could be bound by the transcription factor in ABA signaling to repress gene transcription. Taken together, we propose that Ds-26-16, as a global regulator, improves salt-tolerance by coordinating stress-induced signal transduction and modulating multiple responses in Arabidopsis seedlings. These results provide valuable information for utilizing natural resources in crop improvement for breeding salt-tolerant crops.
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Affiliation(s)
- Si-Yue Liu
- Department of Genetics and Cell Biology, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Jin-Ge Xie
- Department of Genetics and Cell Biology, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Xi-Wen Chen
- Department of Biochemistry and Molecular Biology, College of Life Sciences, Nankai University, Tianjin, 300071, China.
| | - De-Fu Chen
- Department of Genetics and Cell Biology, College of Life Sciences, Nankai University, Tianjin, 300071, China.
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Wu J, Ma LL, Zeng RJ. Role of extracellular polymeric substances in efficient chromium(VI) removal by algae-based Fe/C nano-composite. Chemosphere 2018; 211:608-616. [PMID: 30096574 DOI: 10.1016/j.chemosphere.2018.07.186] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 07/26/2018] [Accepted: 07/31/2018] [Indexed: 06/08/2023]
Abstract
Subsequent application of the obtained algae by chemical coagulation (e.g. Fe(III) addition) presents a challenge because of various iron compounds in algae. In this study, algae obtained by chemical coagulation were carbonized to yield an algae-based Fe/C nano-composite with a high capacity for hexavalent chromium (Cr(VI)) removal (236.9 mg/g), which is attributed to the high reductive Fe content (e.g., FeS, Fe(0), and FeO) and specific surface area. The optimal conditions-that is, 100 mg/L Fe(III) addition and 800 °C-were determined. Moreover, the role of extracellular polymeric substances (EPS) in carbonization was examined as it affected the product composition and efficiency of Cr(VI) removal, owing to the stabilizing property effect of EPS in algae. Algal EPS induced the homogeneous distribution of Fe compounds on the surface of the algae, and the generated α-FeOOH nanoparticles were wrapped in organic carbon matrix, resulting in a sufficient reaction between Fe compounds and organic carbon during carbonization. X-ray photoelectron spectroscopy showed that reduction and adsorption contributed 83.44% and 16.56% to Cr(VI) removal, respectively. This study provides a new insight into the role of EPS in the efficient Cr(VI) removal by algae-based Fe/C nano-composite and presents a promising application of this Fe/C nano-composite in environmental remediation.
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Affiliation(s)
- Jun Wu
- CAS Key Laboratory for Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, PR China
| | - Lin-Lin Ma
- CAS Key Laboratory for Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, PR China
| | - Raymond J Zeng
- CAS Key Laboratory for Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, PR China; Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China.
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