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[PG-0001] Growth performance among the provincial Teak (Tectona grandis Linn.f,) in Myanmar
EiSandi Sett(EiSandi Sett ),Hye-Jin LEE(Hye-Jin LEE),Yang-Gil KIM(Yang-Gil KIM),Dayoung LEE(Dayoung LEE),Sunjeong KIM(Sunjeong KIM),Yoon-Ji Hahn(Yoon-Ji Hahn),Tae-Lim YEO(Tae-Lim YEO),Kyu-Suk KANG(Kyu 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-
Kuguacin: biological activities of triterpenoid from Momordica charantia—a scoping review
Pedro Henrique Sette-de-Souza,Brenda Alencar Araújo Souza,Moan Jéfter Fernandes Costa,Fábio Andrey da Costa Araújo 경희대학교 융합한의과학연구소 2023 Oriental Pharmacy and Experimental Medicine Vol.23 No.1
The Momordica charantia is a vegetable crop used worldwide due to its biological activities. Investigations into the pharmacological activities of the M. charantia revealed that it presented a wide range of properties, including antimicrobial, anti-cancer, anti-diabetic, and anti-obesity. Over the years, the M. charantia compounds have been identified and studied. In this study, we highlighted the Kuguacin, a triterpenoid isolated from any M. charantia parts. Thus, we aimed to synthesize the scientific knowledge about the Kuguacin biological activities and identify gaps in this area. We performed a scoping review using the Preferred Reporting Items for Systematic reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) to design the study’s protocol, with search in PUBMED, EMBASE, SCOPUS, Science Direct, and SciFinder databases. Most of the studies used in vitro methods, and the Kuguacin were isolated from leaves, vines, fruits, and roots. Studies reported the anti-diabetic, anti-cancer, anti-influenza, anti-HIV, and anti-tuberculosis activities of the Kuguacin.
Fatigue of Self-Healing Nanofiber-based Composites: Static Test and Subcritical Crack Propagation
Lee, Min Wook,Sett, Soumyadip,Yoon, Sam S.,Yarin, Alexander L. American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.28
<P>Here, we studied the self-healing of composite materials filled with epoxy-containing nanofibers. An initial incision in the middle of a composite sample stretched in a static fatigue test can result in either crack propagation or healing. In this study, crack evolution was observed in real time. A binary epoxy, which acted as a self-healing agent, was encapsulated in two separate types of interwoven nano/microfibers formed by dual-solution blowing, with the core containing either epoxy or hardener and the shell being formed from poly(vinylidene fluoride)/ poly(ethylene oxide) mixture. The core shell fibers were encased in a poly(dimethylsiloxane) matrix. When the fibers were damaged by a growing crack in this fiber-reinforced composite material because of static stretching in the fatigue test, they broke and released the healing agent into the crack area. The epoxy used in this study was cured and solidified for approximately an hour at room temperature, which then conglutinated and healed the damaged location. The observations were made for at least several hours and in some cases up to several days. It was revealed that the presence of the healing agent (the epoxy) in the fibers successfully prevented the propagation of cracks in stretched samples subjected to the fatigue test. A theoretical analysis of subcritical cracks was performed, and it revealed a jumplike growth of subcritical cracks, which was in qualitative agreement with the experimental results.</P>
Self-healing of nanofiber-based composites in the course of stretching
Lee, Min Wook,Sett, Soumyadip,Yoon, Sam S.,Yarin, Alexander L. Elsevier 2016 Polymer Vol.103 No.-
<P><B>Abstract</B></P> <P>Here we aim to elucidate the self-healing mechanisms in composites with embedded solution-blown nanofibers containing separate reservoirs of epoxy resin and hardener in their cores. In tensile tests of such composite materials with the resin- and hardener-containing solution-blown nanofibers embedded in a polymer matrix, it is shown that the fibers can be ruptured by stretching, thereby releasing the epoxy resin and hardener. Given a resting (or holding) period of 1–2 h, such materials can experience a restoration or even enhancement of stiffness in subsequent stretching, thereby displaying self-healing properties. In two model macroscopic experiments with a single crack tip, conducted in the Appendix with the aim to elucidate the self-healing mechanism, the epoxy resin and hardener released into the tip are shown to react with each other, resulting in a cured and hardened epoxy that heals the crack tip.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Self-healing of nanofiber-based composites is due to release of epoxy and hardener. </LI> <LI> Then, diffusion mixing and curing reaction follow. </LI> <LI> Crack propagation is prevented by solidified epoxy. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Juliana Alves Macedo,Lara Duraes Sette,Helia Harumi Sato 한국식품과학회 2008 Food Science and Biotechnology Vol.17 No.5
Covalent cross-links between a number of proteins and peptides explain why transglutaminase may be widely used by food processing industries. The objective of this work was optimization of the fermentation process to produce transglutaminase from a new microbial source, the Streptomyces sp. P20. The strategy adopted to modify the usual literature media was: (1) fractional factorial design (FFD) to elucidate the key medium ingredients, (2) central composite design (CCD) to optimise the concentration of the key components. Optimization of the medium resulted in not only an 86% increase in microbial transglutaminase activity as compared to the media cited in the literature, but also a reduction in the production cost. Optimal fermentation conditions - namely temperature and agitation rate - were also studied, using CCD methodology. Usual conditions of 30℃ and 100 rpm were within the optimal area. All other parameters for enzyme production were experimentally proven to be optimum fermentation conditions.
Patricia Giovanella,Lídia de Azevedo Duarte,Daniela Mayumi Kita,Valéria Maia de Oliveira,Lara Durães Sette 한국미생물학회 2021 The journal of microbiology Vol.59 No.7
Soil contamination with diesel oil is quite common duringprocesses of transport and storage. Bioremediation is considereda safe, economical, and environmentally friendly approachfor contaminated soil treatment. In this context, studiesusing hydrocarbon bioremediation have focused on totalpetroleum hydrocarbon (TPH) analysis to assess process effectiveness,while ecotoxicity has been neglected. Thus, thisstudy aimed to select a microbial consortium capable of detoxifyingdiesel oil and apply this consortium to the bioremediationof soil contaminated with this environmental pollutantthrough different bioremediation approaches. Gas chromatography(GC-FID) was used to analyze diesel oil degradation,while ecotoxicological bioassays with the bioindicatorsArtemia sp., Aliivibrio fischeri (Microtox), and Cucumissativus were used to assess detoxification. After 90 days ofbioremediation, we found that the biostimulation and biostimulation/bioaugmentation approaches showed higher ratesof diesel oil degradation in relation to natural attenuation(41.9 and 26.7%, respectively). Phytotoxicity increased in thebiostimulation and biostimulation/bioaugmentation treatmentsduring the degradation process, whereas in the Microtoxtest, the toxicity was the same in these treatments as thatin the natural attenuation treatment. In both the phytotoxicityand Microtox tests, bioaugmentation treatment showed lowertoxicity. However, compared with natural attenuation, thisapproach did not show satisfactory hydrocarbon degradation. Based on the microcosm experiments results, we concludethat a broader analysis of the success of bioremediation requiresthe performance of toxicity bioassays.