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Optimization of the Secretion Pathway for Heterologous Proteins in Bacillus subtilis
박성훈,Wolfgang Schumann 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.4
Secretion of homologous proteins in large amounts has been accomplished for many proteins, but no efficient secretion system has been described so far which can be generally applied for heterologous proteins. The objective of this review article is to compare the three major secretion pathways in E. coli and in B. subtilis and review the stages of conversion of the secreted proteins from the unfolded polypeptide chains into the correctly folded and fully active protein. Furthermore, bottlenecks in the production of heterologous proteins and the ways to resolve them are briefly discussed.
Rosentritt, Martin,Schumann, Frederik,Krifka, Stephanie,Preis, Verena The Korean Academy of Prosthodonitics 2020 The Journal of Advanced Prosthodontics Vol.12 No.1
PURPOSE. To investigate the influence of crown material (lithium-disilicate, 3Y-TZP zirconia) and abutment type (rigid implant, resin tooth with artificial periodontium) on wear performance of their antagonist teeth and adjacent teeth. MATERIALS AND METHODS. A mandibular left first molar (#36) with adjacent human teeth (mandibular left second premolar: #35, mandibular left second molar: #37) and antagonistic human teeth (maxillary left second premolar: #25, maxillary left first molar: #26, maxillary left second molar: #27) was prepared simulating a section of the jaw. Samples were made with extracted human molars (Reference), crowned implants (Implant), or crowned resin tooth analogues (Tooth). Crowns (tooth #36; n = 16/material) were milled from lithium-disilicate (Li, IPS e.max CAD) or 3Y-TZP zirconia (Zr, IPS e.max ZirCAD, both Ivoclar Vivadent). Thermal cycling and mechanical loading (TCML) in the chewing simulator were applied simulating 15 years of clinical service. Wear traces were analyzed (frequency [n], depth [㎛]) and evaluated using scanning electron pictures. Wear results were compared by one-way-ANOVA and post-hoc-Bonferroni (α = 0.05). RESULTS. After TCML, no visible wear traces were found on Zr. Li showed more wear traces (n = 30-31) than the reference (n = 21). Antagonistic teeth #26 showed more wear traces in contact to both ceramics (n = 27-29) than to the reference (n = 21). Strong wear traces (> 350 ㎛) on antagonists and their adjacent teeth were found only in crowned groups. Abutment type influenced number and depth of wear facets on the antagonistic and adjacent teeth. CONCLUSION. The clinically relevant model with human antagonistic and adjacent teeth allowed for a limited comparison of the wear situation. The total number of wear traces and strong wear on crowns, antagonistic and adjacent teeth were influenced by crown material.
Chul, Kang Sung,Schumann, Robert,Murai, Shunji,Kiyoshi, Honda,Kim, Young Seup 대한원격탐사학회 1998 International Symposium on Remote Sensing Vol.14 No.1
The purpose of this study is to contribute the development of an El Nino prediction model. The objectives of the study are to (1) extract sea surface height data from the TOPEX/Poseidon altimeter, and (2) compare the relations among the sea surface height, sea surface temperature and wind field. NOAA AVHRR Multi-channel data is used for sea surface temperature and wind data is derived from ERS 1,2 AMI wind scatterometer. The results showed that sea surface height has increased significantly during the El Nino season. The sea surface height is positively related to sea surface temperature and negatively related to zonal wind.