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Search Results: 1 - 10 of 78327 matches for " Shulin Chen "
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Industrial Biosystems Engineering and Biorefinery Systems
Shulin Chen,

生物工程学报 , 2008,
Abstract: The concept of Industrial Biosystems Engineering (IBsE) was suggested as a new engineering branch to be developed for meeting the needs for science, technology and professionals by the upcoming bioeconomy. With emphasis on systems, IBsE builds upon the interfaces between systems biology, bioprocessing, and systems engineering. This paper discussed the background, the suggested definition, the theoretical framework and methodologies of this new discipline as well as its challenges and future development
Industrial Biosystems Engineering and Biorefinery Systems

Shulin Chen,

微生物学报 , 2008,
Abstract: The concept of Industrial Biosystems Engineering (IBsE) was suggested as a new engineering branch to be developed for meeting the needs for science, technology and professionals by the upcoming bioeconomy. With emphasis on systems, IBsE builds upon the interfaces between systems biology, bioprocessing, and systems engineering. This paper discussed the background, the suggested definition, the theoretical framework and methodologies of this new discipline as well as its challenges and future development.
Yarrowia lipolytica as an Oleaginous Cell Factory Platform for Production of Fatty Acid-Based Biofuel and Bioproducts
Ali Abghari,Shulin Chen
Frontiers in Energy Research , 2014, DOI: 10.3389/fenrg.2014.00021
Abstract: Today’s biotechnologists seek new biocatalysts to meet the growing demand for the bioproducts. This review critically evaluates the potential use of Y. lipolytica as an oleaginous cell factory platform. This yeast has undergone extensive modifications for converting a wide range of hydrophobic and hydrophilic biomass, including alkane, oil, glycerol, and sugars to fatty acid-based products. This article highlights challenges in the development of this platform and provides an overview of strategies to enhance its potential in the sustainable production of biodiesel, functional dietary lipid compounds, and other value-added oleochemical compounds. Future applications of the recombinant Y. lipolytica platform are also discussed.
The largest eigenvalue distribution of the Laguerre unitary ensemble
Shulin Lyu,Yan Chen
Physics , 2015,
Abstract: We study the probability that all eigenvalues of the Laguerre unitary ensemble of n by n matrices are between 0 and t, i.e., the largest eigenvalue distribution. Associated with this probability, in the ladder operator approach for orthogonal polynomials, there are recurrence coefficients, namely {\alpha}n(t) and \b{eta}n(t), as well as three auxiliary quantities, denoted by rn(t), Rn(t) and sigma n(t). We establish the second order differential equations for both beta n(t) and rn(t). By investigating the soft edge scaling limit when alpha = O(n) as n ! 1 or alpha is finite, we derive a PII , the sigma-form, and the asymptotic solution of the probability. In addition, we develop differential equations for orthogonal polynomials Pn(z) corresponding to the largest eigenvalue distribution of LUE and GUE with n finite or large. For large n, asymptotic formulas are given near the singular points of the ODE. Moreover, we are able to deduce a particular case of Chazy equation for rho(t) = d/dt(capsigma(t) with capsigma(t) satisfying the sigma-form of PIV or PV . 1 I
Case Study of Biodiesel-Diesel Blends as a Fuel in Marine Environment  [PDF]
Tianxi Zhang, Yapeng Chao, Nan Liu, Joe Thompson, Manuel Garcia, Brian B. He, Jon Van Gerpen, Shulin Chen
Advances in Chemical Engineering and Science (ACES) , 2011, DOI: 10.4236/aces.2011.12011
Abstract: Formation of excessive sludge and fuel filter clogging were experienced in using biodiesel blends under marine environment. In this study, a field test was conducted in a marine ferry boat fueled by canola-based biodiesel blends. The sludge materials collected in the fuel purifier were characterized using inductively coupled plasma (ICP), pyrolysis-GC/MS (Py-GC/MS), thermogravimetric analysis (TGA), and Karl-Fischer titration. It was found that the sludge materials consisted of four distinctive fractions: organic materials derived from diesel and canola biodiesel (major fraction), ash (11-14% w/w), water (~17% w/w), and bacteria. The active bacteria were present in the sludge samples. It was suggested that bacterial contamination was one of the major factors in contribution to the sludge formation.
Renewable Hydrogen Produced from Different Renewable Feedstock by Aqueous-Phase Reforming Process  [PDF]
Yi Wei, Hanwu Lei, Yupeng Liu, Lu Wang, Lei Zhu, Xuesong Zhang, Gayatri Yadavalli, Birgitte Ahring, Shulin Chen
Journal of Sustainable Bioenergy Systems (JSBS) , 2014, DOI: 10.4236/jsbs.2014.42011

Aqueous phase reforming (APR) of biomass derived feedstock producing hydrogen was reviewed. The APR process was discussed based on different feedstock categories such as sugars, polyols and ethanol. The mechanism of APR was analyzed referring to different structures of feedstock. The reaction pathways of APR were investigated. The usage of catalysts should be judged by feedstock on the requirement including C-C bond cleavage, water-gas shift (WGS) reaction, and catalyst maintenance. The prospects were concluded based on the recent works from bimetallic catalysts and high efficient supports. Examples of significant challenges of reducing catalyst cost and increasing catalyst stability have been discussed. The modification and utilization of alkane selectivity of APR processes for liquid fuel production was also investigated.

Insular cortex involvement in declarative memory deficits in patients with post-traumatic stress disorder
Shulin Chen, Lingjiang Li, Baihua Xu, Jun Liu
BMC Psychiatry , 2009, DOI: 10.1186/1471-244x-9-39
Abstract: Twelve subjects with PTSD and 12 subjects without PTSD victims underwent functional magnetic resonance imaging and magnetic resonance imaging. All subjects performed encoding and retrieval memory tasks during the fMRI session. Voxel-based morphometry method was used to analyze gray-matter volume, and the Statistical Parametric Mapping (SPM2) was used to analyze activated brain areas when performing tasks.Grey matter volume was significantly reduced bilaterally in the insular cortex of PTSD subjects than non-PTSD. PTSD group also had lower level of activation in insular cortex when performing word encoding and retrieval tasks than non-PTSD group.The study provides evidence on structural and function abnormalities of the insular cortex in patients with PTSD. Reduced grey-matter volume in insular cortex may be associated with declarative memory deficits in patients with PTSD.The insular cortex (IC) is a region located in the centre of the cerebral hemisphere. It processes sensory input in all modalities: gustatory, olfactory, auditory, visual and somatosensory [1,2]. Although IC is considered primarily as a taste area and is involved in conditional taste aversion and taste recognition, some studies demonstrated the involvement of IC in face recognition, tactile recognition and working memory[3,4]. Results of two animal studies also suggest that the IC is involved in declarative memory. For instance, Bermudez-Rattoni reported that IC is involved in consolidation of memory, and the study by Miranda suggested that cholinergic transmission in the IC is necessary for the acquisition and consolidation of contextual memory[5,6].Studies on PTSD suggest a specific association between the traumatic stress and changes in memory functions [7-9]. Patients with PTSD may suffer from long-term memory deficits. In Archibald and Tuddenham's follow-up study, many veterans of World War II still suffered from episodes of 'black-outs' or impairment of explicit memory[10]. Intrusive memories
Advanced biorefinery in lower termite-effect of combined pretreatment during the chewing process
Jing Ke, Dhrubojyoti D Laskar, Difeng Gao, Shulin Chen
Biotechnology for Biofuels , 2012, DOI: 10.1186/1754-6834-5-11
Abstract: We discovered a combination of specific structural and compositional modification of the lignin framework and partial degradation of carbohydrates that occurs in softwood with physical chewing by the termite, Coptotermes formosanus, which are critical for efficient cell wall digestion. Comparative studies on the termite-chewed and native (control) softwood tissues at the same size were conducted with the aid of advanced analytical techniques such as pyrolysis gas chromatography mass spectrometry, attenuated total reflectance Fourier transform infrared spectroscopy and thermogravimetry. The results strongly suggest a significant increase in the softwood cellulose enzymatic digestibility after termite chewing, accompanied with utilization of holocellulosic counterparts and an increase in the hydrolysable capacity of lignin collectively. In other words, the termite mechanical chewing process combines with specific biological pretreatment on the lignin counterpart in the plant cell wall, resulting in increased enzymatic cellulose digestibility in vitro. The specific lignin unlocking mechanism at this chewing stage comprises mainly of the cleavage of specific bonds from the lignin network and the modification and redistribution of functional groups in the resulting chewed plant tissue, which better expose the carbohydrate within the plant cell wall. Moreover, cleavage of the bond between the holocellulosic network and lignin molecule during the chewing process results in much better exposure of the biomass carbohydrate.Collectively, these data indicate the participation of lignin-related enzyme(s) or polypeptide(s) and/or esterase(s), along with involvement of cellulases and hemicellulases in the chewing process of C. formosanus, resulting in an efficient pretreatment of biomass through a combination of mechanical and enzymatic processes. This pretreatment could be mimicked for industrial biomass conversion.Transformational scientific knowledge on bioprocessing is requir
In situ lignocellulosic unlocking mechanism for carbohydrate hydrolysis in termites: crucial lignin modification
Jing Ke, Dhrubojyoti D Laskar, Deepak Singh, Shulin Chen
Biotechnology for Biofuels , 2011, DOI: 10.1186/1754-6834-4-17
Abstract: We investigated the associated structural modification caused by termites in the lignin biomolecular assembly in softwood tissues crucial for cell-wall degradation. We conducted comparative studies on the termite-digested (i.e. termite feces) and native (control) softwood tissues with the aid of advanced analytical techniques: 13C crosspolarization magic angle spinning and nuclear magnetic resonance (CP-MAS-NMR) spectroscopy, flash pyrolysis with gas chromatography mass spectrometry (Py-GC/MS), and Py-GC-MS in the presence of tetramethylammonium hydroxide (Py-TMAH)-GC/MS.The 13C CP/MAS NMR spectroscopic analysis revealed an increased level of guaiacyl-derived (G unit) polymeric framework in the termite-digested softwood (feces), while providing specific evidence of cellulose degradation. The Py-GC/MS data were in agreement with the 13C CP/MAS NMR spectroscopic studies, thus indicating dehydroxylation and modification of selective intermonomer side-chain linkages in the lignin in the termite feces. Moreover, Py-TMAH-GC/MS analysis showed significant differences in the product distribution between control and termite feces. This strongly suggests that the structural modification in lignin could be associated with the formation of additional condensed interunit linkages.Collectively, these data further establish: 1) that the major β-O-4' (β-aryl ether) was conserved, albeit with substructure degeneracy, and 2) that the nature of the resulting polymer in termite feces retained most of its original aromatic moieties (G unit-derived). Overall, these results provide insight into lignin-unlocking mechanisms for understanding plant cell-wall deconstruction, which could be useful in development of new enzymatic pretreatment processes mimicking the termite system for biochemical conversion of lignocellulosic biomass to fuels and chemicals.Lignin is one of the structural components of the plant cell wall, and provides strength and rigidity in plant tissues [1]. It is highly res
Data Warehouse and Its Application in the Policy Decision of Library

Zhang Shulin Chen Min,

现代图书情报技术 , 2000,
Abstract: Data Warehouse becomes just gradually major increase point of database market and a technique hot spot which second only to Internet in the advanced country from now on. Data Warehouse and OnLine Analytical Precessing (OLAP) have provided technique support for the synthetical Policy decision support system. This paper has expounded the definition of Data Warehouse, feature and system structure and its development direction, and has inquired into the library Data Warehouse s exploitation steps, and the system structure of the synthetical library policy decision support system based on Data Warehouse.
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