Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
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Cyclic alkyl chains promote the polymer self-assembly and packing orders for solar cells
No full textThe micro-structure ordering of the pi-conjugated polymer film self-assembling from solution governs its electrical characteristics and performances for organic electronics. The side chains appended on the conjugated backbone could impact the self-assembling characteristics of the polymer, which show us how to design novel substituents to optimize the polymer arrangement and packing in its solid state. Here, cyclic alkyl chains are proven to be excellent ones for designing of narrow bandgap polymers, the design feature of which with preferential conformations can promote the polymer self-assembly and result in higher degree of lamellar order as well as tighter lamellar packing in the active layer, comparing with linear alkyl chains. The linear ones have poorer ordering in the polymer: fullerene blends as well as in the single crystals of the monomers. The well-organized polymer micro-structures facilitate polymer: fullerene phase separation together with balanced hole/electron transporting, and ultimately, improve the power conversion efficiency impressively compared to linear chains
Effect of SO2 on Catalytic CO Oxidation Over Nano-Structured, Mesoporous Au/Ce1-xZrxO2 Catalysts
No full textA series of nano-structured, mesoporous Au/Ce1 - xZrxO2 type catalysts were synthesized by first synthesizing Ce1-xZrxO2 type of support with different degree of Zr substitutions and following sol-gel route. One weight percent of Au was incorporated on these supports using deposition-precipitation method. These synthesized catalysts were characterized in detail by various techniques, and evaluated for their CO oxidation activity. Effect of SO2 poisoning on catalytic CO oxidation activity was also investigated in detail. It was observed that the catalytic activity for CO oxidation reaction depends on the Ce/Zr molar ratio. The effect of SO2 on CO oxidation was less prominent for the Zr incorporated 'Au/Ce0.8Zr0.2O2 (ACZ0.2)' as compared to bare 'Au/CeO2 (AC)' catalyst. In case of ACZ0.2, the activity remains quite stable even after 5 h of SO2 exposure, however, after 12 and 18 h, the activity decreases to 62 and 55%, respectively. Whereas AC catalyst shows rapid decline in catalytic activity from the first hour of SO2 exposure, and continue to decline significantly to 35 and 18% after 12 and 18 h of SO2 exposure, respectively. Multiple regeneration studies of both bare and Zr incorporated catalysts show pronounced improvement/regain in catalytic activity
Synthesis of a Co-Mo sulfide catalyst with a hollow structure for highly efficient hydrodesulfurization of dibenzothiophene
No full textA facile template-free method is developed to prepare porous Co–
Mo sulfide sub-microtubes with open-ended structures via
sulfurization of the Co–Mo precursor in an ethanol solution of CS2.
The hollow structure significantly improves the exposure degree
of active components, resulting in an ultra-high activity for HDS of
dibenzothiophene
Unexpected Opposite Influences of Para vs Ortho Backbone Fluorination on the Photovoltaic Performance of a Wide-Bandgap Conjugated Polymer
No full textFluorination density and regioregularity are known factors that have high impact on the performance of organic solar cells; however, due to the limited available fluorination positions, the influence of backbone fluorination positions (such as ortho, para, and meta) has not been well studied. Here we disclose that the fluorination position on a conjugated polymer backbone may have completely opposite effects on its performance. Specifically, compared to the nonfluorinated control, Devices fabricated with the conjugated polymer based on para-fluorinated dibenzo[c,h][2,6]-naphthyridine-5,11-(6H,12H)-dione (DBND) block exhibit improved power conversion efficiencies (PCEs) up to 6.55%, while devices fabricated with the conjugated polymer based on ortho-fluorinated DBND block exhibit much worse PCEs as low as 1.44%, although both polymers have similar HOMO/LUMO levels, bandgaps, and backbone torsion angles. It is found that different fluorination positions result in different dipole moments, intermolecular binding energies, and syn/anti conformer ratios, which eventually lead to the distinct phase-separation behaviors of the corresponding solar cells
甘蓝型油菜 ＣＣＣＨ 基因 ＢｎａＡ０７ｇ２６０５０Ｄ 的克隆及表达分析
No full text油菜是我国重要的油料作物ꎬ它的产量受到各种逆境胁迫的影响.我们之前的研究表明ꎬ拟南芥 ＣＣＣＨ 锌指蛋白
ＡｔＣ３Ｈ１４ 控制植株生长发育的诸多过程.在本研究中ꎬ我们证实甘蓝型油菜 ＣＣＣＨ 基因 ＢｎａＡ０７ｇ２６０５０Ｄ(ＡｔＣ３Ｈ１４ 的同源基因)响
应盐胁迫和干旱胁迫.ＢｎａＡ０７ｇ２６０５０Ｄ 蛋白 Ｃ 端包含两个串联的 ＣＸ ８ ＣＸ ５ ＣＸ ３ Ｈ 结构域ꎬ在酵母中具有转录激活活性ꎬ类似于
ＡｔＣ３Ｈ１４.将 ＢｎａＡ０７ｇ２６０５０Ｄ 融合 ＧＦＰ 转化拟南芥原生质体ꎬ 发现其主要定位于细胞质和 Ｐ － ｂｏｄｙ 中. ｑＲＴ － ＰＣＲ 检 测
ＢｎａＡ０７ｇ２６０５０Ｄ 基因的组织表达模式ꎬ结果表明该基因主要在上部茎、根和花中大量表达ꎬ而在其他组织中表达较低.此外ꎬｑＲＴ－
ＰＣＲ 证实 ＢｎａＡ０７ｇ２６０５０Ｄ 基因在盐胁迫和干旱胁迫下表达量都明显上调ꎬ证明该基因可能参与干旱和盐胁迫.我们的研究为利用
基因工程技术培育耐盐、旱油菜新品种提供了基因源
脂肪酶—P450脂肪酸脱羧酶融合蛋白催化的α-烯烃合成
No full textThe irreversibly diminishing reserves and the fluctuating price of crude oil, together with the serious concerns on the global environment and energy security, all suggests an unpleasant future of fossil fuel. Within this context, it is imperative to find alternative eco-friendly fuel with properties that highly mimic fossil fuel. Aliphatic alka(e)nes generated from renewable resources via biosynthetic pathways perfectly suits the criteria and represents the ideal “drop-in” biofuels. α-Alkenes are special microbial natural products. These biohydrocarbons have attracted much attention due to their potential application as biofuels and biomaterials. By coupling the activity of lipase and P450 decarboxylase, lipids (i.e. triglycerides) can be transformed into α-alkenes via free fatty acid intermediates. To improve the conversion efficiency of lipids to α-alkenes, in this study, four different versions of fusion proteins of the lipase TlL from Thermomyces lanuginosus and the P450 decarboxylase OleTJE from Jeotgalicoccus sp. ATCC 8456, including FusA (His6-TlL-linker-OleTJE), FusB (TlL-Linker-OleTJE-His6), FusC (His6-OleTJE-linker-TlL) and FusD (OleTJE- linker-TlL-His6), were constructed and comparatively evaluated. The optimal fusion enzyme FusC was able to convert a number of triacylglycerols including trilaurin (C12), trimyristin (C14) and tripalmitin (C16) into corresponding α-alkenes via the coupled hydrolysis and decarboxylation. The 31.7% yield of 1-tridecene from trimyristin demonstrates good substrate channeling effect. Due to the higher catalytic efficiency compared to the mixed TlL and OleTJE, as well as the simplified enzyme purification and hence the lower cost, this fusion strategy may hold significant potential of application
A Delicately Designed Sulfide Graphdiyne Compatible Cathode for High-Performance Lithium/Magnesium-Sulfur Batteries
No full textNovel sulfur cathodes hold the key to the development of metal-sulfur batteries, the promising candidate of next-generation high-energy-storage systems. Herein, a fascinating sulfur cathode based on sulfide graphdiyne (SGDY) is designed with a unique structure, which is composed of a conducting carbon skeleton with high Li+ mobility and short sulfur energy-storing unites. The SGDY cathode can essentially avoid polysulfide dissolution and be compatible with commercially available carbonate-based electrolytes and Grignard reagent-based electrolytes (all phenyl complex (APC) type electrolytes). Both the assembled Li-S and Mg-S batteries exhibit excellent electrochemical performances including large capacity, superior rate capability, high capacity retention, and high Coulombic efficiency. More importantly, this is the first implementation case of a reliable Mg-S system based on nucleophilic APC electrolytes
Improving phloroglucinol tolerance and production in Escherichia coli by GroESL overexpression. Microbial Cell Factories,
No full text双原子掺杂的B-Al-MCM-41介孔催化剂的制备及其对β-蒎烯二聚反应的高选择性催化.
No full text采用水热法制备了双原子掺杂的介孔催化剂B-Al-MCM-41( 1) ，其结构经TEM，FI-IＲ，XＲD，N2-吸附脱
附和NH3-TPD 表征。并研究了1 对β-蒎烯二聚反应的催化性能。结果表明: 1 具有高度有序的介孔结构和两个
协同的酸性位点( B 和Al) 。1 对β-蒎烯二聚反应的催化活性优于B-MCM-41 和Al-MCM-41。1 用量为2%时，二
聚产物的产率高达62． 82%。循环使用4 次，1
的催化性能基本不变