Kinetic Studies on Radical Scavenging Activity of Kaempferol Decreased by Sn(II) Binding

Sn(II) binds to kaempferol (HKaem, 3,4′,5,7-tetrahydroxy-2-(4-hydroxyphenyl)-4H-1-benzopyran-4-one) at the 3,4-site forming [Sn(II)(Kaem)2] complex in ethanol. DPPH• scavenging efficiency of HKaem is dramatically decreased by SnCl2 coordination due to formation of acid inhibiting deprotonation of HKaem as ligands and thus reduces the radical scavenging activity of the complex via a sequential proton-loss electron transfer (SPLET) mechanism. Moderate decreases in the radical scavenging of HKaem are observed by Sn(CH3COO)2 coordination and by contact between Sn and HKaem, in agreement with the increase in the oxidation potential of the complex compared to HKaem, leading to a decrease in antioxidant efficiency for fruits and vegetables with Sn as package materials

The Effect of Direction on Cursor Moving Kinematics

There have been only few studies to substantiate the kinematic characteristics of cursor movement. In this study, a quantitative experimental research method was used to explore the effect of moving direction on the kinematics of cursor movement in 24 typical young persons using our previously developed computerized measuring program. The results of multiple one way repeated measures ANOVAs and post hoc LSD tests demonstrated that the moving direction had effects on average velocity, movement time, movement unit and peak velocity. Moving leftward showed better efficiency than moving rightward, upward and downward from the kinematic evidences such as velocity, movement unit and time. Moreover, the unique pattern of the power spectral density (PSD) of velocity (strategy for power application) explained why the smoothness was still maintained while moving leftward even under an unstable situation with larger momentum. Moreover, the information from this cursor moving study can guide us to relocate the toolbars and icons in the window interface, especially for individuals with physical disabilities whose performances are easily interrupted while controlling the cursor in specific directions

3D Modeling Method of Whole Structure for Turbo-generator Based on PROE-ANSOFT Information Interaction

In this paper, a new method based on PROE-ANSOFT Information Interaction for building 3D model of turbo-generator structure is proposed, which can solve those problems such as low efficiency of surface modeling, the lack of physical connection relation for the automatic turbo-generator integral structure, the occurrence of insufficient memory and even crashes for imported PROE model. Taking the stator winding coil of a turbo-generator as an example, the establishment process of 3D solid model is given. On this basis, the overall structure of turbo-generator in the ANSOFT working platform is completed. And the advantages and disadvantages of five kinds of simulation models in ANSOFT working platform are compared and analyzed. The results show that the 3D simulation model drawn by this method can be no longer limited to the special solution environment of electromagnetic field symmetry. Meanwhile, this model can simulate the real physical connection relationship, and complete the division of the simulation model, which will be helpful for the further simulation analysis of the finite element software

The measurement factor of employee participation for Knowledge Management System in engineering consulting firms

Knowledge Management Systems (KMS) is a fundamental tool in the implementation process of Knowledge Management (KM), which is used to manage knowledge of information technology systems in an organization. However, a well-developed KMS should not only take advantage of information technology function, but also require the development of a complete measurement system for KMS. The purpose of this research is to develop an employee participation framework to describe the cause-effect relationship of KMS. Three case studies were interviewed for building measurement factors of KMS used by engineering consulting firms. Two questionnaires were sent to managers of engineering consulting firms for establishing main factors and sub factors in the measurement system in which four primary objectives were identified as “Activity in forum”, “Statistic of knowledge system”, “Participation of KM activity”, and “Number of documents”. The cause-effect relationship among four objectives was shown by path analysis. First published online: 27 Aug 201

Comparative Study of 3D Simulation and Experiment on Stator MPPUA of Generator under FWISC Faults with Different Degrees

In order to study the impacts of the stator magnetic pull per unit area (MPPUA) characteristics under different field winding inter-turn short-circuit (FWISC) degrees in generator, comparative study of 3D numerical simulations and experiments are respectively taken to calculate the quantitative data of stator MPPUA by finite-element method (FEM) in this paper. Firstly, the nature exciting force of stator vibration, which is called MPPUA, is carried out. Then simulations data on MPPUA under normal condition and different short-circuit degrees are obtained. Finally, the variation rules of MPPUA characteristics by experiments under different conditions are studied. The results show that in normal condition the main harmonic components of MPPUA consist of only 6th-harmonic component. However, the occurrence of FWISC will bring in extra 1st, 2nd, 3rd, 4th and 5th-harmonic components to MPPUA. Meanwhile, with the increasing of the rotor short circuit degrees, the amplitudes of 1st, 2nd, 3rd, 4th and 5th-harmonic components will present an increasing trend. However, the amplitudes of 6th-harmonic component will present a decrease trend

Depressive Neurosis Treated by Acupuncture for Regulating the Liver —A Report of 176 Cases

ObjectiveTo observe therapeutic effect of acupuncture for regulating the liver on depressive neurosis.MethodsIn a multi-center randomized controlled trial, 440 patients were divided into 3 groups: Acupuncture group for regulating the liver (Acup., 176 cases) was treated by acupuncture at Siguan Points, i.e. bilateral Hegu (LI 4) and Taichong (LR 3), Baihui (GV 20) and Yintang (EX-HN3) plus ear-acupuncture, Prozac group (P., 176 cases) by oral administration of Prozac, and Non-acupoint needling group (NAN, 88 cases) by acupuncture at non-acupoints as acupuncture placebo. Self-rating Depression Scale (SDS) was examined before treatment, and one month, two and three months after treatment respectively to evaluate therapeutic effect, and Rating Scale for Side Effects (SERS) was used to evaluate the safety.ResultsAfter one month of treatment, SDS scores in Acup. Group were significantly lower than that in P. Group (P<0.05) and than that in NAN Group (P<0.01), and SDS scores in P. Group were lower than that in NAN Group (P<0.05), showing the SDS scores in Acup. Group <P. Group <NAN Group. After 2 months of treatment, SDS scores in Acup. Group were also significantly lower than that in P. Group (P<0.01) and than that in NAN Group (P<0.01), and SDS scores in P. Group were also lower than that in NAN Group (P<0.05), showing the SDS scores in Acup. Group <P. Group <NAN Group. After 3 months of treatment, SDS scores in Acup. Group were also significantly lower than that in P. Group (P<0.01) and than that in NAN Group (P<0.01), and SDS scores in P. Group were also lower than that in NAN Group (P<0.01), showing the SDS score in Acup. Group <P. Group <NAN Group. After treatment, SERS scores were 0.16±0.95, 6.51±5.09 and 0.23±1.36 in Acup. Group, P. Group and NAN Group respectively. A significant difference existed between Acup. Group and P. Group (P<0.05), but no significant difference between Acup. Group and NAN Group (P>0.05), showing the SERS scores in Acup. Group <NAN Group <P. Group. No side effect was found in Acup. and NAN groups.ConclusionThe therapeutic effect of acupuncture on depressive neurosis is better than or similar to that of Prozac but with less side effect

Detection of no isochromosome 20q by interphase fluorescent in situ hybridization on uncultured amniocytes in a pregnancy with mosaic isochromosome 20q in cultured amniocytes at amniocentesis

AbstractObjectiveTo present prenatal diagnosis and molecular cytogenetic characterization of mosaic isochromosome 20q at amniocentesis.Materials and methodsA 36-year-old woman underwent amniocentesis at 17 weeks of gestation because of advanced maternal age, and conventional cytogenetic analysis revealed a karyotype of 46,XY,i(20)(q10)[12]/46,XY[7]. Repeated amniocentesis was performed at 20 weeks of gestation. During repeated amniocentesis, array comparative genomic hybridization (aCGH), interphase fluorescence in situ hybridization (FISH), and quantitative fluorescent polymerase chain reaction (QF-PCR) were performed on uncultured amniocytes, and conventional cytogenetic analysis and interphase FISH were performed on cultured amniocytes.ResultsConventional cytogenetic analysis of cultured amniocytes revealed a karyotype of 46,XY,i(20)(q10)[4]/46,XY[16]. Interphase FISH analysis on 217 uncultured amniocytes did not detect isochromosome 20q, aCGH on the DNA extracted from uncultured amniocytes showed no genomic imbalance, and QF-PCR analysis on the DNA extracted from uncultured amniocytes excluded uniparental disomy 20 (UPD 20). Interphase FISH analysis on 115 cultured untouched amniocytes revealed 13% (15/115 cells) mosaicism for isochromosome 20q.ConclusionMosaic isochromosome 20q detected at amniocentesis can be a cell culture artifact. Detailed ultrasound examination, performing interphase FISH and/or aCGH on uncultured amniocytes for confirmation of true mosaicism, and performing QF-PCR to exclude UPD 20 may be useful under such a circumstance