Dang H.,Xiamen University |
Dang H.,CAS Qingdao Institute of Bioenergy and Bioprocess Technology |
Lovell C.R.,University of South Carolina
Microbiology and Molecular Biology Reviews | Year: 2016
Biotic and abiotic surfaces in marine waters are rapidly colonized by microorganisms. Surface colonization and subsequent biofilm formation and development provide numerous advantages to these organisms and support critical ecological and biogeochemical functions in the changing marine environment. Microbial surface association also contributes to deleterious effects such as biofouling, biocorrosion, and the persistence and transmission of harmful or pathogenic microorganisms and their genetic determinants. The processes and mechanisms of colonization as well as key players among the surface-associated microbiota have been studied for several decades. Accumulating evidence indicates that specific cell-surface, cell-cell, and interpopulation interactions shape the composition, structure, spatiotemporal dynamics, and functions of surface-associated microbial communities. Several key microbial processes and mechanisms, including (i) surface, population, and community sensing and signaling, (ii) intraspecies and interspecies communication and interaction, and (iii) the regulatory balance between cooperation and competition, have been identified as critical for the microbial surface association lifestyle. In this review, recent progress in the study of marine microbial surface colonization and biofilm development is synthesized and discussed. Major gaps in our knowledge remain. We pose questions for targeted investigation of surface-specific communitylevel microbial features, answers to which would advance our understanding of surface-associated microbial community ecology and the biogeochemical functions of these communities at levels from molecular mechanistic details through systems biological integration. Copyright © 2015, American Society for Microbiology. All Rights Reserved.
Wang Q.,CAS Qingdao Institute of Bioenergy and Bioprocess Technology
Renewable and Sustainable Energy Reviews | Year: 2011
The booming automobile in China has added additional pressure on the country that needs to import almost 50% of its oil. Non-food-based biofuel is a viable fuel alternative for cars. China already has the required-foundation to commercialize non-food-based biofuel. Chinese crop straw and stock, energy crop, and woody biomass that could potentially be converted into energy are projected to be 700 million toe (ton of oil equivalent) in the near future. Meanwhile, Chinese food-based ethanol fuel industry ranks as the world's third after United States and Brazil. Several non-food-based ethanol plants are constructed or under constructed, one of which has been licensed. However, more efforts should be directed to commercializing non-food-based biofuel, including industrialized feedstock, strengthening key technology research, supporting private enterprise, and E10 upgrading to E20. The enormous increase in private ownership of car must compel China to commercialize biofuel. © 2010 Elsevier Ltd.
Cui G.,Max-Planck-Institut fur Kohlenforschung |
Lan Z.,CAS Qingdao Institute of Bioenergy and Bioprocess Technology |
Thiel W.,Max-Planck-Institut fur Kohlenforschung
Journal of the American Chemical Society | Year: 2012
In commonly studied GFP chromophore analogues such as 4-(4- hydroxybenzylidene)-1,2-dimethyl-1H-imidazol-5(4H)-one (PHBDI), the dominant photoinduced processes are cis-trans isomerization and subsequent S 1 → S 0 decay via a conical intersection characterized by a highly twisted double bond. The recently synthesized 2-hydroxy-substituted isomer (OHBDI) shows an entirely different photochemical behavior experimentally, since it mainly undergoes ultrafast intramolecular excited-state proton transfer, followed by S 1 → S 0 decay and ground-state reverse hydrogen transfer. We have chosen 4-(2-hydroxybenzylidene)-1H-imidazol-5(4H)-one (OHBI) to model the gas-phase photodynamics of such 2-hydroxy-substituted chromophores. We first use various electronic structure methods (DFT, TDDFT, CC2, DFT/MRCI, OM2/MRCI) to explore the S 0 and S 1 potential energy surfaces of OHBI and to locate the relevant minima, transition state, and minimum-energy conical intersection. These static calculations suggest the following decay mechanism: upon photoexcitation to the S 1 state, an ultrafast adiabatic charge-transfer induced excited-state intramolecular proton transfer (ESIPT) occurs that leads to the S 1 minimum-energy structure. Nearby, there is a S 1/S 0 minimum-energy conical intersection that allows for an efficient nonadiabatic S 1 → S 0 internal conversion, which is followed by a fast ground-state reverse hydrogen transfer (GSHT). This mechanism is verified by semiempirical OM2/MRCI surface-hopping dynamics simulations, in which the successive ESIPT-GSTH processes are observed, but without cis-trans isomerization (which is a minor path experimentally with less than 5% yield). These gas-phase simulations of OHBI give an estimated first-order decay time of 476 fs for the S 1 state, which is larger but of the same order as the experimental values measured for OHBDI in solution: 270 fs in CH 3CN and 230 fs in CH 2Cl 2. The differences between the photoinduced processes of the 2- and 4-hydroxy-substituted chromophores are attributed to the presence or absence of intramolecular hydrogen bonding between the two rings. © 2011 American Chemical Society.
Rostamnia S.,Islamic Azad University at Maragheh |
Xin H.,CAS Qingdao Institute of Bioenergy and Bioprocess Technology
Applied Organometallic Chemistry | Year: 2013
A series of ordered mesoporous organic-inorganic hybrid material was designed by using the amine-functionalized SBA-15 (PdX2@SBA-15/N Y, Y = 1, 2) as solid support for palladium complexes. Among them, the Pd(OAc)2/ethylenediamine complex encapsulated into SBA-15 (Pd(OAc)2@SBA-15/PrEn or Pd(OAc)2@SBA-15/PrNHEtNH 2) exhibits higher activity and selectivity toward Suzuki cross-coupling reaction under aerobic conditions and water solvent mixture. The SBA-15/PrEn supported palladium pre-catalyst could be separated easily from reaction products and used repetitively several times, showing its superiority over homogeneous catalysts for industrial and chemical applications. Copyright © 2013 John Wiley & Sons, Ltd.
Lu X.,CAS Qingdao Institute of Bioenergy and Bioprocess Technology
Biotechnology Advances | Year: 2010
Biofuels are expected to play a key role in the development of a sustainable, economical and environmentally safe source of energy. Microbes offer great potential for applications in technology based biofuel production. Three fundamental questions need to be addressed in order for the development of microbial synthesis of biofuels to be successful. Firstly, what energy resource platform could be used to make biofuels. Secondly, what type of biofuel is the ideal fuel molecule that should be targeted. Finally, what microbial system could be used to transform energy resources into the targeted biofuel molecules. In this perspective, the potential of using photosynthetic microbes (cyanobacteria in particular) in the solar energy driven conversion of carbon dioxide to fatty acid-based biofuels is explored. © 2010 Elsevier Inc.