One-pot Synthesis of lO-Methyl-1,2,3,4,5,6,7,8,9,10-decahydroacridine-l,8-dione Derivatives under Microwave Heating without Catalyst

A series of 10-methyl-1,2,3,4,5,6,7,8,9,10-decahydroacridine-1,8-dione derivatives were synthesized by one-pot reaction of aldehyde, dimedone or 1,3-cyclohexanedione and methylamine in glycol or water under microwave heating without catalyst. The method has the advantage of short routine and reaction time, high yields as well as friendly environment. And the reaction was not only suitable for aliphatic and aromatic monoaldehyde, but also for aromatic dialdehyde.

Sol-Gel Derived Carbon Ceramic Electrode Bulk-Modified with Tris(1,10-phenanthroline-5,6-dione)iron(II) Hexafluorophos-phate and Its Use as an Amperometric Iodate Sensor

A surface-renewable tris(1, 10-phenanthroline-5,6-dione)iron (Ⅱ)hexafluorophosphate (FePD) modified carbon ceramic electrode was constructed by dispersing FePD andgraphite powder in methyltrimethoxysilane (MTMOS) based gels. The FePD-modified electrode presentedpH-dependent voltammetric behavior, and its peak currents were diffusion-controlled in 0.1 mol/LNa_2SO_4 + H_2SO_4 solution (pH = 0.4). In the presence of iodate, clear electrocatalytic reductionwaves were observed and thus the chemically modified electrode was used as an amperometric sensorfor iodate in common salt. The linear range, sensitivity, detection limit and response time of theiodate sensor were 5 x 10^(-6)―1 x 10~2 mol/L, 7.448 μA·L/mmol, 1.2 x 10^(-6) mol/L and 5 s,respectively. A distinct advantage of this sensor is its good reproducibility of surface-renewal bysimple mechanical polishing.

Sono-chemical Synthesis and Mechanism of Dibenz[a,c]anthracene

Planar polycyclic aromatic hydrocarbons have important applications in optoelectronics,environmental chemistry and cancer researches.An improved sono-chemical synthetic procedure of dibenz[a,c]anthracene（D[a,c]A） was reported in this work.The yield was increased to 56% and the resultant was carefully characterized via gas chromatography-electron impact mass spectrometry（GC-EIMS）,matrix assisted laser desorption ionization-time of flight（MALDI-TOF）,1 H NMR,13 C NMR,correlation spectrometry（1 H1 H COSY）,heteronuclear multiple bond correlation（HMBC） and heteronuclear multiple quantum coherence（HMQC）.Based on the characterization data,we proposed a 4-step mechanistic explanation for the formation of D[a,c]A under sono-chemical bis-ortho-Wittig reaction conditions.

Dynamic changes in cerebral microcirculation and hypoxia in the early stages of diffuse axonal injury

This study demonstrated that damage to the cerebral microvasculature, the formation of microthrombi and swelling of vascular endothelial cells occur early and peak 12 hours after injury in a rat model of diffuse axonal injury. Moreover, these pathological changes were most evident in the cerebral cortex. Cerebral microcirculatory dysfunction peaked later and had a shorter duration than axonal injury. In addition, the radioactive imaging agent, 99Tcm-4, 9-diaza-2, 3, 10, 10- tetramethyldodecan-2, 11 -dione dioxime, was used to visualize the dynamic changes that occur in tissue with cerebral hypoxia. The results demonstrated that cerebral hypoxia occurs at an early stage in diffuse axonal injury. Cerebral hypoxia was evident 12 hours after injury and declined slightly 24 hours after injury, but was significantly higher than in the control group. The pathological changes that underpin microcirculatory dysfunction did not occur at the same time as axonal injury, but did occur simultaneously with neuronal injury. Cerebral hypoxia plays a key role in promoting the secondary brain injury that occurs after diffuse axonal injury.

山沉香中两个新倍半萜的结构鉴定和抗菌活性(英文)

目的:对山沉香中化学成分的分离鉴定和抗菌活性进行研究。方法:运用柱层析等方法对山沉香氯仿层进行分离纯化,并通过波谱解析和理化鉴别进行结构鉴定。同时对分离得到化合物的抗菌活性进行了评估。结果:从山沉香分离得到2个倍半萜类化合物:guai-9-en-4β-ol(1)和14, 15-dinorguai-1, 11-dien-9, 10-dione(2)。化合物1对Bacillus coagulas具有良好的活性而对Proteous vulgaris活性较差; 化合物2对Eschecheria coli具有良好的活性而对Staphylococcus aureus活性较差。结论:化合物1和2为新化合物, 具有较好的抗菌活性。