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Müller DF, Wibbing D, Herwig C, Kager J. Simultaneous real-time estimation of maximum substrate uptake capacity and yield coefficient in induced microbial cultures. Comput Chem Eng 2023. [DOI: 10.1016/j.compchemeng.2023.108203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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2
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Dong H, Yu H, Xu R, Cheng W, Ye Y, Xie S, Zhao J, Cheng Y. Review and prospects of mining chemical dust suppressant: classification and mechanisms. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:18-35. [PMID: 36371569 DOI: 10.1007/s11356-022-23840-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 10/22/2022] [Indexed: 06/16/2023]
Abstract
Coal mine pollution is a serious threat to the mine safe production and occupational health of miners. Chemical dust suppression can effectively reduce the concentration of coal dust and suppress the re-entrainment of dust. This paper discusses the research progress of three kinds of traditional dust suppressants: the wetting-type, cohesive type, and condensed type. In order to meet dust suppression and environmental protection requirements, 7 kinds of new type dust suppressants, such as compound, ecological environmental protection, polymer, functional, microbes, and enzymes, have been developed by the predecessors. And all kinds of dust suppressant mechanism and main performance index have been summarized. Through the analysis of the research results from 1985 to 2021, it is found that the compound and environment-friendly dust suppressants have gradually become the research focus in this field, accounting for 17.93% and 26.21% of the total number of achievements. In the recent 5 years, new materials, such as microbe suppressant, urease suppressant, and nanomaterials, have gradually emerged. Because of their natural and environmental protection characteristics, it could be predicted that they will become the future development trend in this field. However, there are still some problems to be improved, such as expensive price and complex preparation technology.
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Affiliation(s)
- Hui Dong
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Haiming Yu
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China.
| | - Rongxiao Xu
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Weimin Cheng
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Yuxi Ye
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Sen Xie
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Junwei Zhao
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Yu Cheng
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
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Zeng F, Fan Z, Wu S, Cheng X, Tian Y. Photo-patterned oxygen sensing films based on Pt porphyrin for controlling cell growth and studying metabolism. RSC Adv 2019; 9:924-930. [PMID: 35517627 PMCID: PMC9059522 DOI: 10.1039/c8ra09234f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 12/23/2018] [Indexed: 11/21/2022] Open
Abstract
A new type of biocompatible and photo-polymerizable hydrogel with oxygen sensors for microengineering was developed. Herein, a red emitter as an oxygen probe which was chemically immobilized in a poly(2-hydroxyethyl methacrylate)-co-polyacrylamide-based matrix was expected to monitor cell metabolism. A few micropatterned films with gratings (5, 7, 10, 20, and 50 μm in width, respectively and with 1.2 μm in height) were designed and fabricated by photo-lithography using these hydrogels. SEM and AFM were used to validate these films to attain their lateral width and vertical depth. The oxygen responses of these films were characterized. Results showed that patterned films exhibited higher sensitivity than the non-patterned films. The films' construction can also have some influence on cell alignment and elongation. This phenomenon was evaluated by culturing human cervical cancer cells (HeLa cells) and mouse embryo fibroblasts (3T3-L1), on the film surfaces with different construction. Linear correlation between cell elongation and the logarithm of grating width was observed. Real-time monitoring of oxygen consumption of HeLa cells in cell culture medium was achieved. This study is expected to have potential to be applied in micro-structured design and to help understanding metabolism.
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Affiliation(s)
- Fei Zeng
- Department of Materials Science and Engineering, Southern University of Science and Technology No. 1088 Xueyuan Blvd, Xili, Nanshan District Shenzhen Guangdong 518055 China
| | - Zengju Fan
- Department of Materials Science and Engineering, Southern University of Science and Technology No. 1088 Xueyuan Blvd, Xili, Nanshan District Shenzhen Guangdong 518055 China
| | - Shanshan Wu
- Guangdong Industry Polytechnic No. 152 Xingang West Road, Haizhu District Guangzhou 510300 China
| | - Xing Cheng
- Department of Materials Science and Engineering, Southern University of Science and Technology No. 1088 Xueyuan Blvd, Xili, Nanshan District Shenzhen Guangdong 518055 China
| | - Yanqing Tian
- Department of Materials Science and Engineering, Southern University of Science and Technology No. 1088 Xueyuan Blvd, Xili, Nanshan District Shenzhen Guangdong 518055 China
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Lee SY, Shin WR, Sekhon SS, Lee JP, Kim YC, Ahn JY, Kim YH. Molecular Docking Analysis and Biochemical Evaluation of Levansucrase from Sphingobium chungbukense DJ77. ACS COMBINATORIAL SCIENCE 2018; 20:414-422. [PMID: 29812898 DOI: 10.1021/acscombsci.8b00002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Bacterial exopolymer Levan (β-(2,6) polyfructan) synthesized by levansucrase has attracted interest for various applications due to its low intrinsic viscosity compared with other polysaccharides. We report a novel levansucrase (Lsc) isolated from Sphingobium chunbukense DJ77 and verify its biochemical characteristics by comparative analysis of molecular docking analysis (MOE) and catalytic residue analysis. The complete sequence of the Lsc encoding gene ( lsc) was cloned under the direction of the T7 promoter and purified in an Escherichia coli BL21 (DE3) protein expression system. The enzyme activity analysis and ligand docking MOE study of S. chungbukense DJ77 Lsc revealed that Arg 77, Ser112, Arg 195, Asp196, Glu257, and Gln275 were involved in the sucrose binding and splitting as well as transfructosylation activity. A catalytic comparison of Lsc of S. chungbukense DJ77 with the results of site-directed mutational analysis indicated that Gln275 may coordinate a favorable substrate binding environment, offering broad pH resistance in the range of 5-10. The results suggest that the recombinant E. coli carrying S. chungbukense DJ77 Lsc might produce levan under the regular growth conditions with less need for pH manipulation.
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Affiliation(s)
- Soo Youn Lee
- School of Biological Sciences, Chungbuk National University, 1 Chungdae-Ro, Seowon-Gu, Cheongju 28644, Korea
- Climate Change Research Division, Korea Institute of Energy Research, 152 Gajeong-Ro, Yuseong-Gu, Daejeon 34129, Korea
| | - Woo-Ri Shin
- School of Biological Sciences, Chungbuk National University, 1 Chungdae-Ro, Seowon-Gu, Cheongju 28644, Korea
| | - Simranjeet Singh Sekhon
- School of Biological Sciences, Chungbuk National University, 1 Chungdae-Ro, Seowon-Gu, Cheongju 28644, Korea
| | - Jin-Pyo Lee
- School of Biological Sciences, Chungbuk National University, 1 Chungdae-Ro, Seowon-Gu, Cheongju 28644, Korea
| | - Young-Chang Kim
- School of Biological Sciences, Chungbuk National University, 1 Chungdae-Ro, Seowon-Gu, Cheongju 28644, Korea
| | - Ji-Young Ahn
- School of Biological Sciences, Chungbuk National University, 1 Chungdae-Ro, Seowon-Gu, Cheongju 28644, Korea
| | - Yang-Hoon Kim
- School of Biological Sciences, Chungbuk National University, 1 Chungdae-Ro, Seowon-Gu, Cheongju 28644, Korea
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6
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Avoiding overfeeding in high cell density fed-batch cultures of E. coli during the production of heterologous proteins. J Biotechnol 2014; 192 Pt A:146-53. [DOI: 10.1016/j.jbiotec.2014.09.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 08/28/2014] [Accepted: 09/04/2014] [Indexed: 11/17/2022]
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7
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Zhou B, Liu K, Liu X, Yung KY, Bartsch CM, Heckman EM, Bright FV, Swihart MT, Cartwright AN. Enhanced performance from a hybrid quenchometric deoxyribonucleic acid (DNA) silica xerogel gaseous oxygen sensing platform. APPLIED SPECTROSCOPY 2014; 68:1302-1305. [PMID: 25280266 DOI: 10.1366/13-07430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A complex of salmon milt deoxyribonucleic acid (DNA) and the cationic surfactant cetyltrimethylammonium (CTMA) forms an organic-soluble biomaterial that can be readily incorporated within an organically modified silane-based xerogel. The photoluminescence (PL) intensity and excited-state luminescence lifetime of tris(4,7'-diphenyl-1,10'-phenanathroline) ruthenium(II) [(Ru(dpp)3](2+), a common O2 responsive luminophore, increases in the presence of DNA-CTMA within the xerogel. The increase in the [Ru(dpp)3](2+)excited-state lifetime in the presence of DNA-CTMA arises from DNA intercalation that attenuates one or more non-radiative processes, leading to an increase in the [Ru(dpp)3](2+) excited-state lifetime. Prospects for the use of these materials in an oxygen sensor are demonstrated.
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Affiliation(s)
- Bin Zhou
- KLA-Tencor Corporation, 1 Technology Dr., Milpitas, CA 95035 USA
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8
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Johnsson O, Andersson J, Lidén G, Johnsson C, Hägglund T. Feed rate control in fed-batch fermentations based on frequency content analysis. Biotechnol Prog 2013; 29:817-24. [DOI: 10.1002/btpr.1727] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Revised: 02/27/2013] [Indexed: 11/06/2022]
Affiliation(s)
- Ola Johnsson
- Dept. of Automatic Control; Faculty of Engineering LTH; Lund University; Sweden
| | | | - Gunnar Lidén
- Dept. of Chemical Engineering; Faculty of Engineering LTH; Lund University; Sweden
| | - Charlotta Johnsson
- Dept. of Automatic Control; Faculty of Engineering LTH; Lund University; Sweden
| | - Tore Hägglund
- Dept. of Automatic Control; Faculty of Engineering LTH; Lund University; Sweden
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9
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Yung KY, Xu H, Liu K, Martinez GJ, Bright FV, Detty MR, Cartwright AN. Hybrid oxygen-responsive reflective Bragg grating platforms. Anal Chem 2012; 84:1402-7. [PMID: 22191377 DOI: 10.1021/ac2024816] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Oxygen responsive sensor platforms were fabricated by pin printing tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) ([Ru(dpp)(3)](2+)) doped sols onto wavelength tuned reflective Bragg gratings. In an epi-luminescence configuration, these Bragg gratings (Gr) were designed to selectively reflect the O(2) responsive [Ru(dpp)(3)](2+) emission toward the detector to enhance the detected signal magnitude. The xerogel based sensors were formed onto (i) glass (XGl), (ii) directly on top of the grating (XGrGl), or (iii) on the glass substrate opposite the grating (XGlGr). The results show that all sensors exhibit linear, statistically equivalent O(2) sensitivities, and the XGrGl platform yields up to an 8-fold increase in relative detected analytical signal (RDAS) in comparison to the control (XGl) platform.
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Affiliation(s)
- Ka Yi Yung
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, USA
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10
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Vanags J, Hrynko V, Viesturs U. Development and application of a flexible controller in yeast fermentations using pO2 cascade control. Eng Life Sci 2010. [DOI: 10.1002/elsc.200900112] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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11
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Sahoo P, Ananthanarayanan R, Malathi N, Rajiniganth M, Murali N, Swaminathan P. Pulsating potentiometric titration technique for assay of dissolved oxygen in water at trace level. Anal Chim Acta 2010; 669:17-24. [DOI: 10.1016/j.aca.2010.04.040] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2010] [Revised: 04/16/2010] [Accepted: 04/22/2010] [Indexed: 11/16/2022]
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12
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Medaglia G, Valsesia G, Panke S. Development of a high cell-density protocol for the production of pregallidermin, a non-toxic precursor of the lantibiotic gallidermin. J Biotechnol 2010; 145:176-85. [DOI: 10.1016/j.jbiotec.2009.11.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2009] [Revised: 11/03/2009] [Accepted: 11/12/2009] [Indexed: 11/17/2022]
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13
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Pizarro SA, Dinges R, Adams R, Sanchez A, Winter C. Biomanufacturing process analytical technology (PAT) application for downstream processing: Using dissolved oxygen as an indicator of product quality for a protein refolding reaction. Biotechnol Bioeng 2009; 104:340-51. [DOI: 10.1002/bit.22382] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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14
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Development of a fed-batch process for the production of anticancer drug TATm-survivin(T34A) in Escherichia coli. Biochem Eng J 2009. [DOI: 10.1016/j.bej.2008.09.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Feeding strategies for the enhanced production of recombinant human serum albumin in the fed-batch cultivation of Hansenula polymorpha. Process Biochem 2008. [DOI: 10.1016/j.procbio.2008.04.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Drakakis EM, Lim M, Radomska A, Mantalaris A, Panoskaltsis N, Cass A. A real-time multi-channel monitoring system for stem cell culture process. IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS 2008; 2:66-77. [PMID: 23852753 DOI: 10.1109/tbcas.2008.925639] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A novel, up to 128 channels, multi-parametric physiological measurement system suitable for monitoring hematopoietic stem cell culture processes and cell cultures in general is presented in this paper. The system aims to measure in real-time the most important physical and chemical culture parameters of hematopoietic stem cells, including physicochemical parameters, nutrients, and metabolites, in a long-term culture process. The overarching scope of this research effort is to control and optimize the whole bioprocess by means of the acquisition of real-time quantitative physiological information from the culture. The system is designed in a modular manner. Each hardware module can operate as an independent gain programmable, level shift adjustable, 16 channel data acquisition system specific to a sensor type. Up to eight such data acquisition modules can be combined and connected to the host PC to realize the whole system hardware. The control of data acquisition and the subsequent management of data is performed by the system's software which is coded in LabVIEW. Preliminary experimental results presented here show that the system not only has the ability to interface to various types of sensors allowing the monitoring of different types of culture parameters. Moreover, it can capture dynamic variations of culture parameters by means of real-time multi-channel measurements thus providing additional information on both temporal and spatial profiles of these parameters within a bioreactor. The system is by no means constrained in the hematopoietic stem cell culture field only. It is suitable for cell growth monitoring applications in general.
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Gnoth S, Jenzsch M, Simutis R, Lübbert A. Control of cultivation processes for recombinant protein production: a review. Bioprocess Biosyst Eng 2007; 31:21-39. [DOI: 10.1007/s00449-007-0163-7] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2007] [Accepted: 09/11/2007] [Indexed: 12/21/2022]
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18
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Henes B, Sonnleitner B. Controlled fed-batch by tracking the maximal culture capacity. J Biotechnol 2007; 132:118-26. [PMID: 17573139 DOI: 10.1016/j.jbiotec.2007.04.021] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2006] [Revised: 04/04/2007] [Accepted: 04/19/2007] [Indexed: 11/30/2022]
Abstract
Fed-batch processes are well established in the biotech industry. The major reason to apply this technique is to avoid overflow metabolism and/or accumulation of toxic substrates. The basic idea of this approach is to control the physiological state of the culture, rather than just the typically exponential feed rate profile, by challenging a fed-batch cultivation repetitive in useful time intervals. The feed rate is reduced for a short period and culture responses are analysed in real time and on-line. Thus it is possible to get a positive response at the earliest detectable point of potential overfeeding. During the disturbance minute amounts of overflow metabolites will deplete simultaneously. This highly dynamic approach was applied successfully to industrially relevant production systems such as yeasts (Saccharomyces cerevisiae, Pichia pastoris) and bacteria (Escherichia coli).
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Affiliation(s)
- Bernhard Henes
- Institute for Chemistry and Biotechnology, Zurich University of Applied Sciences, Winterthur, Switzerland
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19
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Optical Sensing Material for Dissolved Oxygen: Covalent Immobilization of Tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) Complex in Sol-Gels. B KOREAN CHEM SOC 2007. [DOI: 10.5012/bkcs.2007.28.5.883] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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20
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Synthesis of Tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) Complexes Possessing a Linker Arm for Use in Sol-gel-based Optical Oxygen Sensor. B KOREAN CHEM SOC 2006. [DOI: 10.5012/bkcs.2006.27.12.2084] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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21
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de Maré L, Cimander C, Elfwing A, Hagander P. Feeding strategies for E. coli fermentations demanding an enriched environment. Bioprocess Biosyst Eng 2006; 30:13-25. [PMID: 17082912 DOI: 10.1007/s00449-006-0090-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2006] [Accepted: 10/01/2006] [Indexed: 11/26/2022]
Abstract
The addition of a carbon nutrient feed to a fed-batch cultivation is often not enough to obtain satisfactory growth and/or production. In some cases, an additional feed with for example supplementary amino acids or complex media is required. This work presents the development of feeding strategies where more than one feed is required and the knowledge of the growth requirements is low. Simulations and cultivations with E. coli are shown using the proposed feed controllers which are based on a probing control concept. The strategies work well and they can be used to shorten the process development phase considerably.
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Affiliation(s)
- L de Maré
- Department of Automatic Control, LTH, Lund University, Box 118, 221 00 Lund, Sweden.
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22
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Tao Z, Tehan EC, Tang Y, Bright FV. Stable Sensors with Tunable Sensitivities Based on Class II Xerogels. Anal Chem 2006; 78:1939-45. [PMID: 16536431 DOI: 10.1021/ac051657b] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report on the analytical figures of merit for O2-responsive sensor arrays and films formed by sequestering tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) within class II organically modified silicates that are composed of tetramethoxysilane or tetraethoxysilane and monoalkylsiloxanes of the form (CnH(2n+1))-Si-(OR)3 (n = 1-12, R = Me or Et). These sensors exhibit a reasonably linear response to gaseous and dissolved O2 (r2 > 0.99), and the sensor responses are stable for over 2 years. Sensor sensitivity can be tuned continuously by adjusting n. For gas-phase O2 detection, changes in the sensor sensitivity depend primarily on the O2 diffusion coefficient within the xerogel phase. The O2 solubility coefficient within the xerogel phase is also a factor but to a lesser degree. For dissolved O2 detection, changes in the sensor sensitivity depend on the O2 diffusion coefficient and the O2 solubility coefficient within the xerogel phase. A linear correlation also exists between the sensor sensitivity and the polarity within these xerogels. Finally, the feature size of pin-printed sensor elements was found to depend linearly on pin velocity. The results of these experiments demonstrate a new strategy for creating xerogel-based sensor arrays consisting of diversified sensor elements for the same target analyte.
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Affiliation(s)
- Zunyu Tao
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, USA
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Graumann K, Premstaller A. Manufacturing of recombinant therapeutic proteins in microbial systems. Biotechnol J 2006; 1:164-86. [PMID: 16892246 DOI: 10.1002/biot.200500051] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Recombinant therapeutic proteins have gained enormous importance for clinical applications. The first recombinant products have been produced in E. coli more than 20 years ago. Although with the advent of antibody-based therapeutics mammalian expression systems have experienced a major boost, microbial expression systems continue to be widely used in industry. Their intrinsic advantages, such as rapid growth, high yields and ease of manipulation, make them the premier choice for expression of non-glycosylated peptides and proteins. Innovative product classes such as antibody fragments or alternative binding molecules will further expand the use of microbial systems. Even more, novel, engineered production hosts and integrated technology platforms hold enormous potential for future applications. This review summarizes current applications and trends for development, production and analytical characterization of recombinant therapeutic proteins in microbial systems.
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Affiliation(s)
- Klaus Graumann
- Novartis Biopharmaceutical Operations, Sandoz GmbH, Biochemiestrasse 10, 6250 Kundl, Austria.
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24
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Tang Y, Tao Z, Bukowski RM, Tehan EC, Karri S, Titus AH, Bright FV. Tailored xerogel-based sensor arrays and artificial neural networks yield improved O2 detection accuracy and precision. Analyst 2006; 131:1129-36. [PMID: 17003861 DOI: 10.1039/b604214g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The objective of this research is to develop arrays of tuned chemical sensors wherein each sensor element responds to a particular target analyte in a unique manner. By creating sol-gel-derived xerogels that are co-doped with two luminophores at a range of molar ratios, we can form suites of sensor elements that can exhibit a continuum of response profiles. We trained an artificial neural network (ANN) to "learn" to identify the optical outputs from these xerogel-based sensor arrays. By using the ANN in concert with our tailored sensor arrays we obtained a 5-10 fold improvement in accuracy and precision for quantifying O2 in unknown samples. We also explored the response characteristics of these types of sensor elements after they had been contacted with rat plasma/blood. Contact with plasma/blood caused approximately 15% of the luminophore molecules within the xerogels to become non-responsive to O2. This behavior is consistent with rat albumin blocking certain pore sub-populations within the mesoporous xerogel matrix thereby limiting O2 access to the luminophores.
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Affiliation(s)
- Ying Tang
- Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, USA
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