Pub Date : 2021-03-06DOI: 10.37394/232023.2021.1.3
B. Kim, S. S. Sawant, T. Tran
Global energy demand and environmental concerns have stimulated increasing efforts to produce bioenergy and biofuels directly from renewable resources. The production of petroleum alternative compounds like bioplastics from abundantly available renewable materials in nature such as cellulosic and algal biomass through consolidated bioprocessing is an innovative approach. Here we show the production of bioplastics polyhydroxylkanotes (PHA) by consolidated bioprocessing using a bacterium with ability to degrade complex polysaccharides such as agarose and xylan without pre-treatment. The association of the bacterium in coculture with another bacterium dynamically enhanced agarose degradation and PHA production from xylan. Consolidated bioprocessing of complex polysaccharides to PHA investigated in this study opens up new avenues of employment of pure and co-culture for efficient production of PHA.
{"title":"Production of Polyhydroxyalkanotes from Complex Polysaccharides","authors":"B. Kim, S. S. Sawant, T. Tran","doi":"10.37394/232023.2021.1.3","DOIUrl":"https://doi.org/10.37394/232023.2021.1.3","url":null,"abstract":"Global energy demand and environmental concerns have stimulated increasing efforts to produce bioenergy and biofuels directly from renewable resources. The production of petroleum alternative compounds like bioplastics from abundantly available renewable materials in nature such as cellulosic and algal biomass through consolidated bioprocessing is an innovative approach. Here we show the production of bioplastics polyhydroxylkanotes (PHA) by consolidated bioprocessing using a bacterium with ability to degrade complex polysaccharides such as agarose and xylan without pre-treatment. The association of the bacterium in coculture with another bacterium dynamically enhanced agarose degradation and PHA production from xylan. Consolidated bioprocessing of complex polysaccharides to PHA investigated in this study opens up new avenues of employment of pure and co-culture for efficient production of PHA.","PeriodicalId":336407,"journal":{"name":"MOLECULAR SCIENCES AND APPLICATIONS","volume":"253 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131880803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-04DOI: 10.37394/232023.2021.1.2
L. Porojan, F. Topala
The development of different materials for the use in posterior areas for aesthetic monolitic crowns has been a challenge in dental technology. The goal of this study was to develop 3D posterior teeth covered with complete aesthetic monolitic crowns and to compare the stress distributions under loads, revealing the effect of various materials on the biomechanical performance of the crowns. For the experimental analyses premolars and molars were chosen in order to simulate the biomechanical behaviour of the teeth restored with complete aesthetic monolitic crowns (zirconia, glass ceramic, composite). A static structural analysis was performed to calculate the stress distribution using the computer-aided engineering software. First principal stresses were recorded in the tooth structures and in the restoration for all these materials. Stresses recorded in the ceramic restorations are direct proportional with the elasticity of the material. Crowns made of materials with high elasticity (composite) show better behaviour for premolars then for molars, compared to ceramic materials. Stress values and distribution results can provide design guidelines for new and varied materials, regarding to the restored teeth.
{"title":"Influence of the Material on Stress Distribution in Aesthetic Monolitic Complete Dental Crowns","authors":"L. Porojan, F. Topala","doi":"10.37394/232023.2021.1.2","DOIUrl":"https://doi.org/10.37394/232023.2021.1.2","url":null,"abstract":"The development of different materials for the use in posterior areas for aesthetic monolitic crowns has been a challenge in dental technology. The goal of this study was to develop 3D posterior teeth covered with complete aesthetic monolitic crowns and to compare the stress distributions under loads, revealing the effect of various materials on the biomechanical performance of the crowns. For the experimental analyses premolars and molars were chosen in order to simulate the biomechanical behaviour of the teeth restored with complete aesthetic monolitic crowns (zirconia, glass ceramic, composite). A static structural analysis was performed to calculate the stress distribution using the computer-aided engineering software. First principal stresses were recorded in the tooth structures and in the restoration for all these materials. Stresses recorded in the ceramic restorations are direct proportional with the elasticity of the material. Crowns made of materials with high elasticity (composite) show better behaviour for premolars then for molars, compared to ceramic materials. Stress values and distribution results can provide design guidelines for new and varied materials, regarding to the restored teeth.","PeriodicalId":336407,"journal":{"name":"MOLECULAR SCIENCES AND APPLICATIONS","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122082766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.37394/232023.2021.1.1
E. Sulman, Yu.V. Lugovoy, Y. Kosivtsov, K. Chalov, I. Smirnov, A. Sidorov, A. Stepacheva
In this paper the influence of different catalyst on the catalytic thermolysis of different biomass wastes was studied. Synthetic and natural zeolites were used as catalysts for thermolysis. During the test it was mentioned that the pore size of additives had a strong effect on the catalytic activity and promoted the hydrocarbons formation. Also it was found the positive influence of the molded compositions on the structural and sorption characteristics and a role of catalyst in the subsequent thermolysis reaction. Moreover within the laboratory scale the catalytic refining method of gaseous products was developed and described for further commercial use. The natural aluminosilicate had increased the gaseous product yield in 2 times compared to non-catalytic process. The gases produced by fast thermolysis can be used as an alternative to fossil fuels.
{"title":"Aluminosilicates in Biomass Thermolysis Gas Refining","authors":"E. Sulman, Yu.V. Lugovoy, Y. Kosivtsov, K. Chalov, I. Smirnov, A. Sidorov, A. Stepacheva","doi":"10.37394/232023.2021.1.1","DOIUrl":"https://doi.org/10.37394/232023.2021.1.1","url":null,"abstract":"In this paper the influence of different catalyst on the catalytic thermolysis of different biomass wastes was studied. Synthetic and natural zeolites were used as catalysts for thermolysis. During the test it was mentioned that the pore size of additives had a strong effect on the catalytic activity and promoted the hydrocarbons formation. Also it was found the positive influence of the molded compositions on the structural and sorption characteristics and a role of catalyst in the subsequent thermolysis reaction. Moreover within the laboratory scale the catalytic refining method of gaseous products was developed and described for further commercial use. The natural aluminosilicate had increased the gaseous product yield in 2 times compared to non-catalytic process. The gases produced by fast thermolysis can be used as an alternative to fossil fuels.","PeriodicalId":336407,"journal":{"name":"MOLECULAR SCIENCES AND APPLICATIONS","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124599238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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