干燥处理对野生稻愈伤组织绿苗分化率和某些生化指标的影响

对４种野生稻愈伤组织进行了干燥处理，其中３种野生稻绿苗分化率得到不同程度的提高．干燥处理的愈伤组织中吲哚乙酸（ＩＡＡ）、水溶性蛋白（ＷＳＰ）水平明显下降，过氧化物酶同工酶活性升高．干燥处理可能是通过提高愈伤组织中过氧化物酶同工酶活性来降低ＩＡＡ含量，从而促使野生稻绿苗分化率的提高．     

Structural tuning of coordination polymers by 4-connecting metal node and secondary building process

Due to variation in ligand's conformation, metal node's connecting geometry, and secondary building process by anions, bat-like, dumbell-like, diamondoid, or pillar-layer topologies are achieved.     

Stepwise adsorption in a mesoporous metal-organic framework: experimental and computational analysis

Stepwise adsorption in a metal-organic framework with both micro- and meso-pores is caused by adsorbates first filling the micropores, then adsorbing along the mesopore walls, and finally filling the mesopores.     

利用CCD图像的灰度梯度实现物体三维测量

提出了一种利用CCD单目图像的灰度梯度测量三维表面的方法——灰度梯度法。巧妙地运用中间变量，找到灰度梯度与聚焦像表面梯度之间的映射关系，将灰度约束方程转变为可求解的一元方程，从而解出聚焦像表面的深度信息。利用聚焦像表面与物体间的几何光学的约束以及它们之间的空间共轭对称关系，将该三维表面变换到实际三维尺寸，以达到三维测量的目的。最后对影响该测量系统的误差进行了分析。该方法克服了传统的光切法因过多冗余图像而使测量效率低的缺点，且该方法约束条件容易实现。对球体和柱面体的试验误差率分别为6．0％和4．85％，显示出该方法在一定范围内是有效的。     

Ammonia recycled percolation as a complementary pretreatment to the dilute-acid process

Applied Biochemistry and Biotechnology - A two-stage dilute-acid percolation (DA) was investigated as a pretreatment method for switchgrass. With use of extremely low acid (0.078 wt% sulfuric acid)...     

Precise Modulation of the Breathing Behavior and Pore Surface in Zr‐MOFs by Reversible Post‐Synthetic Variable‐Spacer Installation to Fine‐Tune the Expansion Magnitude and Sorption Properties

To combine flexibility and modifiability towards a more controllable complexity of MOFs, a post‐synthetic variable‐spacer installation (PVSI) strategy is used to implement kinetic installation/ uninstallation of secondary ligands into/from a robust yet flexible proto‐Zr‐MOF. This PVSI process features precise positioning of spacers with different length, size, number, and functionality, enabling accurate fixation of successive breathing stages and fine‐tuning of pore surface. It shows unprecedented synthetic tailorability to create complicated MOFs in a predictable way for property modification, for example, CO₂ and R22 adsorption/separation, thermal/chemical stability, and extended breathing behavior.     

一个未解决问题——46阶C-矩阵的存在性

一个C-矩阵是一个n阶方阵C,其对角元素为0和其余元素为+1或-1,使得 CC~T=(n-1)I。 已知C-矩阵存在的必要条件是:对对称C-矩阵,n≡2(mod4)和n-1=a~2+b~2,其中a和b为整数;对斜对称C-矩阵,n=2或n≡0(mod4)。 C-矩阵是Belevitch在研究会议电话(Conference telephony)网络的构造中提出来的,对称情形叫做会议矩阵。对一个斜对称C-矩阵C,矩阵H=C+I是一个斜对称Hadamard矩阵。从Paley,Goethals-Seidel和Delsarte-Goethals-Seidel知,对     

Nonisothermal simultaneous saccharification and fermentation for direct conversion of lignocellulosic biomass to ethanol

The enzymatic reaction in the simultaneous saccharification and fermentation (SSF) is operated at a temperature much lower than its optimum level. This forces the enzyme activity to be far below its potential, consequently raising the enzyme requirement. To alleviate this problem, a nonisothermal simultaneous saccharification and fermentation process (NSSF) was investigated. The NSSF is devised so that saccharification and fermentation occur simultaneously, yet in two separate reactors that are maintained at different temperatures. Lignocellulosic biomass is retained inside a column reactor and hydrolyzed at the optimum temperature for the enzymatic reaction (50°C). The effluent from the column reactor is recirculated through a fermenter, which runs at its optimum temperature (20-30°C). The cellulase enzyme activity is increased by a factor of 2-3 when the hydrolysis temperature is raised from 30 to 50°C. The NSSF process has improved the enzymatic reaction in the SSF to the extent that it reduces the overall enzyme requirement by 30-40%. The effect of temperature on β-glucosidase activity was the most significant among the individual cellulase compounds. Both ethanol yield and productivity in the NSSF are substantially higher than those in the SSF at the enzyme loading of 5 IFPU/g glucan. With 10 IFPU/g glucan, improvement in productivity was more discernible for the NSSF. The terminal yield attainable in 4 d with the SSF was reachable in 40 h with the NSSF.