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Bonete JM, Tamashiro JR, Paiva FFGD, Queiroz-Fernandes GMD, Guidelli É, Baffa O, Kinoshita A. Influence of silver nanoparticles on the tissue reaction of polyacrylic acid-based gel. Acta Cir Bras 2022; 37:e370504. [PMID: 35976341 PMCID: PMC9377206 DOI: 10.1590/acb370504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Accepted: 04/20/2022] [Indexed: 11/22/2022] Open
Abstract
Purpose: To study the influence of silver nanoparticles (AgNP) on tissue reaction when incorporated into a polymeric matrix of polyacrylic acid-based (Carbopol®) gel as a proposal for a new low-cost type of biomaterial that is simple to manufacture for use as an antimicrobial and antioxidative dressing. Methods: In-vivo tests of implantation in the subcutaneous tissue of the back of rats were performed using polyethylene tubes in three situations: empty, only the gel, and gel incorporated with AgNP. Then, the tissue reaction was studied by counting inflammatory cells. Additionally, in-vitro tests of the antioxidative and antimicrobial activity of AgNP were performed. The radical 2,2 diphenyl-1 picrylhydrazyl (DPPH) was used to test the antioxidative activity of AgNP using electron spin resonance. The antimicrobial activity of AgNP was determined by minimum inhibitory concentration against the microorganisms: Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli. Results: The results indicated that AgNP presents antioxidative activity and was able to inhibit the growth of the microorganisms tested. The addition of AgNP in Carbopol® did not alter the tissue inflammatory response (p>0.05, Kruskal-Wallis’s test). Conclusions: The new biomaterial is promising for future use as a dressing for its beneficial properties for regenerative processes.
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Affiliation(s)
- Jéssica Mariana Bonete
- Graduate student. Centro Universitário Sagrado Coração - Center for Health Sciences - Bauru (SP), Brazil
| | - Jacqueline Roberta Tamashiro
- PhD. Universidade do Oeste Paulista - Postgraduate Program in Environment and Regional Development - Presidente Prudente (SP), Brazil
| | - Fábio Friol Guedes de Paiva
- PhD. Universidade do Oeste Paulista - Postgraduate Program in Environment and Regional Development - Presidente Prudente (SP), Brazil
| | | | - Éder Guidelli
- PhD. Universidade de São Paulo - Faculty of Philosophy, Sciences and Letters of Ribeirão Preto - Ribeirao Preto (SP), Brazil
| | - Oswaldo Baffa
- PhD. Universidade de São Paulo - Faculty of Philosophy, Sciences and Letters of Ribeirão Preto - Ribeirao Preto (SP), Brazil
| | - Angela Kinoshita
- PhD. Universidade do Oeste Paulista - Postgraduate Program in Environment and Regional Development - Presidente Prudente (SP), Brazil
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Bhingaradia YM, Gondaliya SJ. Utilization of Nonabsorbable (Polyamide Black) Buried Subcutaneous Suture Material in Closure of Elliptical Excision in Various Indications for Better Aesthetic Outcome. J Cutan Aesthet Surg 2021; 14:215-219. [PMID: 34566365 PMCID: PMC8423201 DOI: 10.4103/jcas.jcas_93_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The aim of this report was to study the effectiveness of nonabsorbable (polyamide black) subcutaneous buried suture (6-0) in elliptical excision of various indications for better outcome of the scar. Clinical data of 155 patients, who underwent nonabsorbable buried subcutaneous closure in elliptical excision for different indications, were collected randomly and analyzed retrospectively. By using a modified Vancouver Scar Scale, which includes an assessment of pliability, the height of scar, vascularity, and pigmentation, all postoperative scars were classified into five categories: excellent, good, moderate, hypertrophic scar, or keloid. A total of 155 patients of elliptical excision with different indications were included in the study. In this study, the male-to-female ratio was 1:2, and patients in the age-group between 10 and 70 years were involved. Of 155 patients, 72% of patients had excellent cosmetic outcome (0 score), 21.29% had good cosmetic outcome (1 score), and 2.58% had a moderate cosmetic outcome (2 score) without any hypertrophic scar or keloid by using a modified Vancouver Scar Scale. No complaints were reported during the study. Scar closure by nonabsorbable buried subcutaneous suture will reduce cutaneous tension, so there will be a better approximation of wound edges and thus better outcome of the scar.
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Affiliation(s)
- Yogesh M Bhingaradia
- Department of Dermatology, Shivani Skin Care and Cosmetic Clinic, Surat, Gujarat, India
| | - Shailika J Gondaliya
- Department of Dermatology, Shivani Skin Care and Cosmetic Clinic, Surat, Gujarat, India
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3
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Valencia AM, Valencia CH, Zuluaga F, Grande-Tovar CD. Synthesis and fabrication of films including graphene oxide functionalized with chitosan for regenerative medicine applications. Heliyon 2021; 7:e07058. [PMID: 34095569 PMCID: PMC8165423 DOI: 10.1016/j.heliyon.2021.e07058] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 11/08/2020] [Accepted: 05/10/2021] [Indexed: 12/16/2022] Open
Abstract
Graphene oxide (GO) has recently gained attention as a scaffold reinforcing agent for tissue engineering. Biomechanical and biological properties through a synergistic effect can be strengthened when combined with other materials such as chitosan (CS). For that reason, chitosan was used for Graphene Oxide (GO) functionalization through an amide group whose formation was evident by bands around 1600 cm−1 in the FTIR analysis. Furthermore, bands located at 1348 cm−1 (D band), 1593 cm−1 (G band), and 2416 cm−1 (2D band) in the RAMAN spectrum, and the displacement of the signal at 87.03 ppm (C5) in solid-state 13C-NMR confirmed the amide formation. Films including the CS-GO compound were prepared and characterized by thermogravimetric analysis (TGA), where CS-GO film presented a lighter mass loss (~10% less loosed) than CS due probably to the covalent functionalization with GO, providing film thermal resistance. The CS-GO films synthesized were implanted in Wistar rats' subdermal tissue as a first approximation to the biological response. In vivo tests showed a low inflammatory response, good cicatrization, and advanced resorption at 60 days of implantation, as indicated by histological images. It was evidenced that the covalent union between CS and GO increased biocompatibility and the degradation/resorption capacity, demonstrating tissue regeneration with typical characteristics and tiny remnants of implanted material surrounded by a type III collagen capsule. These results show the potential application of the new synthesized films, including the CS-GO compound, in tissue engineering.
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Affiliation(s)
- Ana María Valencia
- Laboratorio SIMERQO Polímeros, Departamento de Química, Universidad del Valle, Calle 13 # 100-00, Cali 76001, Colombia
| | - Carlos Humberto Valencia
- Escuela de Odontología, Grupo Biomateriales Dentales, Universidad del Valle, Calle 4B No. 36-00, Cali 76001, Colombia
| | - Fabio Zuluaga
- Laboratorio SIMERQO Polímeros, Departamento de Química, Universidad del Valle, Calle 13 # 100-00, Cali 76001, Colombia
| | - Carlos David Grande-Tovar
- Grupo de Investigación de Fotoquímica y Fotobiología, Universidad del Atlántico, Carrera 30 Número 8-49, Puerto Colombia 081008, Colombia
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4
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Nguyen VP, Yoo J, Lee JY, Chung JJ, Hwang JH, Jung Y, Lee SM. Enhanced Mechanical Stability and Biodegradability of Ti-Infiltrated Polylactide. ACS APPLIED MATERIALS & INTERFACES 2020; 12:43501-43512. [PMID: 32893625 DOI: 10.1021/acsami.0c13246] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Biodegradable polymers have been often used in place of conventional nondegradable polymers for industrial and medical applications. In particular, polylactide (PLA) has been regarded as a popular ecofriendly plastic and has many advantages like good biocompatibility and processability. Yet, it still has some drawbacks in mechanical properties. Here, we prepared Ti-infiltrated PLA by mimicking the gelatinous jaw of a seaworm whose mechanical properties are toggled up and down by the tiny amount of metal ions, expecting to prepare a new type of alternative. Ti induced significant chemical and microstructural changes in the PLA, which led to a notable improvement in the mechanical properties as compared to the neat PLA. The Ti-infiltrated PLA exhibited high resistance to rapid degradation. More importantly, the toxicity assessment demonstrated that the resulting PLA is still biocompatible and nontoxic. Consequently, we proved that the Ti-infiltrated PLA has high mechanical properties comparable to conventional nondegradable polymers and good biocompatibility as well as delayed biodegradability. We anticipate the current Ti-infiltrated PLA to be an ecofriendly replacement of some conventional plastics, which helps preserve a green environment.
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Affiliation(s)
- Viet Phuong Nguyen
- Nanomechatronics, Korea University of Science and Technology (UST), Daejeon 34113, Republic of Korea
- Department of Nanomechanics, Korea Institute of Machinery and Materials (KIMM), Daejeon 34103, Republic of Korea
| | - Jin Yoo
- Center for Biomaterials, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Ju Young Lee
- Animal Model Research Group, Jeonbuk Department of Inhalation Research, Korea Institute of Toxicology (KIT), Jeongeup 53212, Jeollabuk-do, Republic of Korea
- Division of Human and Environmental toxicology, Korea University of Science and Technology (UST), Daejeon 34113, Republic of Korea
| | - Justin J Chung
- Center for Biomaterials, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Jeong Ho Hwang
- Animal Model Research Group, Jeonbuk Department of Inhalation Research, Korea Institute of Toxicology (KIT), Jeongeup 53212, Jeollabuk-do, Republic of Korea
| | - Youngmee Jung
- Center for Biomaterials, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
- School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Seung-Mo Lee
- Nanomechatronics, Korea University of Science and Technology (UST), Daejeon 34113, Republic of Korea
- Department of Nanomechanics, Korea Institute of Machinery and Materials (KIMM), Daejeon 34103, Republic of Korea
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5
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Burnett CL, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD, Liebler DC, Marks JG, Shank RC, Slaga TJ, Snyder PW, Gill LJ, Heldreth B. Safety Assessment of Polyene Group as Used in Cosmetics. Int J Toxicol 2020; 39:59S-90S. [PMID: 32975153 DOI: 10.1177/1091581820952385] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The Expert Panel for Cosmetic Ingredient Safety (Panel) reviewed the safety of polyenes, which are reported to function in cosmetics primarily as film formers and viscosity increasing agents. The Panel reviewed relevant data related to these ingredients, not inggaps in the available safety data for some of the polyenes in this safety assessment. The data available for many of the ingredients are sufficient and can be extrapolated to support the safety of the entire group because of the similarities in the chemical structures, chemical properties, use concentrations, and reported functions across the group. The Panel concluded that polyenes were safe in cosmetics in the present practices of use and concentration described in this safety assessment.
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Naftalovich R, Naftalovich D, Greenway FL. Polytetrafluoroethylene Ingestion as a Way to Increase Food Volume and Hence Satiety Without Increasing Calorie Content. J Diabetes Sci Technol 2016; 10:971-6. [PMID: 26810925 PMCID: PMC4928218 DOI: 10.1177/1932296815626726] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Since satiety is largely due to stretch of the stomach and people tend to eat a consistent weight of food, increasing food volume and mass increases satiety. This can be achieved without increasing the calories of food by mixing food with a material that cannot be metabolized. Such a material should be inert, safe, resistant to stomach acid, lack taste, available in powder form, smooth, resistant to heat, and cost effective. Polytetrafluoroethylene (PTFE) is an ideal substance for this purpose. It is a soft plastic that is widely considered to be the most inert material known and is extremely stable. Animal feeding trials showed that rats fed a diet of 25% PTFE for 90 days had no signs of toxicity and that the rats lost weight. This article publishes the data from these subchronic animal feeding trials, reviews the relevant available literature, and hypothesizes that increasing the volume of food by mixing the food with PTFE powder at a ratio of 3 parts food to 1 part PTFE by volume will substantially improve satiety and reduce caloric consumption in people.
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Affiliation(s)
- Rotem Naftalovich
- Department of Anesthesiology, Saint Barnabas Medical Center, Livingston, NJ, USA
| | - Daniel Naftalovich
- Department of Medical Engineering, California Institute of Technology, Pasadena, CA, USA Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Frank L Greenway
- Department of Pharmacology-based Clinical Trials, Pennington Biomedical Research Center, Louisiana State University, Baton Rouge, LA, USA
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Meissner M, Valesky EM, Kaufmann R. Subcutaneous non-absorbable polypropylene (SNAP) sutures in serial excision of congenital naevi: A new time-saving technique reducing dehiscence with optimized aesthetic results. J Eur Acad Dermatol Venereol 2014; 30:533-5. [PMID: 25546586 DOI: 10.1111/jdv.12931] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- M Meissner
- Department of Dermatology, Venereology and Allergology, University Hospital Frankfurt, Goethe-University, Frankfurt am Main, Germany
| | - E M Valesky
- Department of Dermatology, Venereology and Allergology, University Hospital Frankfurt, Goethe-University, Frankfurt am Main, Germany
| | - R Kaufmann
- Department of Dermatology, Venereology and Allergology, University Hospital Frankfurt, Goethe-University, Frankfurt am Main, Germany
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Prabhawathi V, Thirunavukarasu K, Doble M. A study on the long term effect of biofilm produced by biosurfactant producing microbe on medical implant. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 40:212-8. [DOI: 10.1016/j.msec.2014.03.050] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 03/06/2014] [Accepted: 03/21/2014] [Indexed: 11/28/2022]
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Grotenhuis N, vd Toom HFE, Kops N, Bayon Y, Deerenberg EB, Mulder IM, van Osch GJVM, Lange JF, Bastiaansen-Jenniskens YM. In vitro model to study the biomaterial-dependent reaction of macrophages in an inflammatory environment. Br J Surg 2014; 101:983-92. [DOI: 10.1002/bjs.9523] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/03/2014] [Indexed: 01/29/2023]
Abstract
Abstract
Background
Macrophages play an important role in the reaction to biomaterials, which sometimes have to be used in a surgical field at risk of contamination. The macrophage phenotype in reaction to biomaterials in an inflammatory environment was evaluated in both an in vivo and in vitro setting.
Methods
In the in vivo setting, polypropylene (PP) biomaterial was implanted for 28 days in the contaminated abdominal wall of rats, and upon removal analysed by routine histology as well as immunohistochemistry for CD68 (marker for macrophages), inducible nitric oxide synthase (iNOS – a marker for proinflammatory M1 macrophages) and CD206 (marker for anti-inflammatory M2 macrophages). For the in vitro model, human peripheral blood monocytes were cultured for 3 days on biomaterials made from PP, collagen (COL), polyethylene terephthalate (PET) and PET coated with collagen (PET+COL). These experiments were performed both with and without lipopolysaccharide and interferon γ stimulation. Secretion of both M1- and M2-related proteins was measured, and a relative M1/M2 index was calculated.
Results
In vivo, iNOS- and CD206-positive cells were found around the fibres of the implanted PP biomaterial. In vitro, macrophages on both PP and COL biomaterial had a relatively low M1/M2 index. Macrophages on the PET biomaterial had a high M1/M2 index, with the highest increase of M1 cytokines in an inflammatory environment. Macrophages on the PET+COL biomaterial also had a high M1/M2 index.
Conclusion
Macrophages in an inflammatory environment in vitro still react in a biomaterial-dependent manner. This model can help to select biomaterials that are tolerated best in a surgical environment at risk of contamination.
Surgical relevance
Biomaterials in an environment at risk of contamination are often not tolerated owing to a high risk of postoperative infection, which may ultimately lead to removal of the biomaterial.
An in vitro model with primary human macrophages was used to provide insight into the acute reaction of macrophages to a biomaterial in an inflammatory environment simulated with lipopolysaccharide and interferon γ. The reaction of macrophages in such an inflammatory environment was still biomaterial-dependent.
This in vitro model can be used to study the reaction of macrophages to different biomaterials in an inflammatory environment in more detail, and thereby help to select biomaterials that are tolerated best in a surgical environment at risk of contamination.
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Affiliation(s)
- N Grotenhuis
- Department of Otorhinolaryngology, Erasmus MC University Medical Centre Rotterdam, Rotterdam, The Netherlands
- Department of General Surgery, Erasmus MC University Medical Centre Rotterdam, Rotterdam, The Netherlands
| | - H F E vd Toom
- Department of Otorhinolaryngology, Erasmus MC University Medical Centre Rotterdam, Rotterdam, The Netherlands
| | - N Kops
- Department of Orthopaedics, Erasmus MC University Medical Centre Rotterdam, Rotterdam, The Netherlands
| | - Y Bayon
- Covidien – Sofradim Production, Trévoux, France
| | - E B Deerenberg
- Department of General Surgery, Erasmus MC University Medical Centre Rotterdam, Rotterdam, The Netherlands
| | - I M Mulder
- Department of General Surgery, Erasmus MC University Medical Centre Rotterdam, Rotterdam, The Netherlands
| | - G J V M van Osch
- Department of Otorhinolaryngology, Erasmus MC University Medical Centre Rotterdam, Rotterdam, The Netherlands
- Department of Orthopaedics, Erasmus MC University Medical Centre Rotterdam, Rotterdam, The Netherlands
| | - J F Lange
- Department of General Surgery, Erasmus MC University Medical Centre Rotterdam, Rotterdam, The Netherlands
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Freeman AL, Buttermann GR, Beaubien BP, Rochefort WE. Compressive properties of fibrous repair tissue compared to nucleus and annulus. J Biomech 2013; 46:1714-21. [PMID: 23643028 DOI: 10.1016/j.jbiomech.2013.03.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Revised: 03/27/2013] [Accepted: 03/30/2013] [Indexed: 11/19/2022]
Abstract
The wound healing process includes filling the void between implant and tissue edges by collagenous connective repair tissue. This fibrous repair tissue may load share or stabilize implants such as spinal disc replacements. The objective of this study was the biomechanical characterization of human fibrous tissue compared to annulus fibrosus and nucleus pulposus. Human lumbar discs (10 nucleus and annulus) and 10 lumbar deep wound fibrous tissue specimens were sectioned into 12mm diameter×6mm high cylindrical samples. Confined compression testing, after 2h swelling at 0.11MPa, was performed at 5%, 10% and 15% strain over 3.5h. Unconfined dynamic testing (2-0.001Hz) was performed at 5-15% strain. Semi-quantitative histology estimated the proportion of proteoglycan to collagen. Fibrous tissue exhibited a decrease in height during the swelling period whereas annulus and nucleus tissues did not. The aggregate modulus was significantly less for fibrous tissue (p<0.002). Percent stress relaxation was greatest for the fibrous tissue and similar for annulus and nucleus. Dynamic testing found the storage modulus (E') was greater than the loss modulus (E″) for all tissues. Annulus were found to have greater E' and E″ than nucleus, whereas E' and E″ were similar between annulus and fibrous tissue. Fibrous tissue had the greatest increase in both moduli at greater frequencies, but had the lowest hydration and proteoglycan content. Fibrous tissue would not be a substitute for native tissue within the disc space but if adjacent to a disc prosthesis may impart some degree of intersegmental stability during acute loading activities.
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Affiliation(s)
- Andrew L Freeman
- Excelen Center for Bone and Joint Research, Minneapolis, MN, USA.
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Grotenhuis N, Bayon Y, Lange J, Van Osch G, Bastiaansen-Jenniskens Y. A culture model to analyze the acute biomaterial-dependent reaction of human primary macrophages. Biochem Biophys Res Commun 2013; 433:115-20. [DOI: 10.1016/j.bbrc.2013.02.054] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Accepted: 02/10/2013] [Indexed: 10/27/2022]
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