[Evaluation of the efficacy of 70% ethanol in removing calcium hydroxide in curved root canals].

Purpose: To evaluate the efficacy of micro-computed tomography(Micro-CT) in removing calcium hydroxide from posterior curved root canals.

Methods: Twenty molar teeth (48 root canals) extracted at the Department of General Dentistry, Shanghai Ninth People's Hospital between December 2023 and February 2024 were collected. After preparing by Ni-TI instruments M3 according to standard root canal treatment procedures, calcium hydroxide was injected into the root canals.

[Study of the effect of different methods on the removal of calcium hydroxide in root canal by micro-computed tomography in vivo].

Purpose: To establish molar root canal model with micro-computed tomography (Micro-CT) and evaluate the removal efficiency of calcium hydroxide by different methods.

Methods: Eight molar teeth (24 root canals) extracted from the Department of General Dentistry, Shanghai Ninth People's Hospital from October 2023 to February 2024 were collected. Root canal preparation was instrumented by M3 according to standard root canal treatment procedures, then calcium hydroxide was injected into the root canal.

Comparative Study on Chemical Constituents of Ginseng Flowers with Four Consecutive Cultivation Age.

The harvest period of cultivated ginseng is generally 4-6 years. Ginseng flowers (GFs), the nonmedicinal parts, are usually removed every autumn, in which components are generally believed to stay unchanged with the increasing cultivation age. Recently, few documents were reported on the variation of volatile organic compounds (VOCs) and other components about ginseng flowers.

miR-522 facilitates the prosperities of endometrial carcinoma cells by directly binding to monoamine oxidase B.

It is well known that microRNAs (miRNAs) are crucial regulatory factors in tumorigenesis, as tumor suppressors or cancer-promoting factors. However, the study of endometrial carcinoma relevance in miR-522 is rare, indicating an undefined molecular mechanism for its role. Therefore, we performed this study to examine the role of miR-522 on the biological behaviors of endometrial carcinoma.

[Effect of catalase on marginal microleakage of resin restoration after external bleaching].

Purpose: To investigate the effect of catalase on marginal microleakage of resin restoration after external tooth bleaching with 10% carbamide peroxide.

Methods: Forty extracted human premolars, both intact and health, were randomly divided into 4 groups: group 1, direct composite resin filling without bleaching; group 2, composite resin filling immediately after external bleaching; group 3, immersed in artificial saliva for 3 weeks after external bleaching ,then filling with composite resin; group 4 ,cavity treated with catalase after external bleaching and then filled with composite resin. After 2000 thermal cycles, the teeth were immersed in 2% methylene blue for 24 hours, then the microleakage of interface of resin restorations was observed under stereomicroscope.

FeCl3-catalyzed stereoselective construction of spirooxindole tetrahydroquinolines via tandem 1,5-hydride transfer/ring closure.

An efficient FeCl(3)-catalyzed stereoselective intramolecular tandem 1,5-hydride transfer/ring closure reaction was developed. The method allows for the formation of structurally diverse spirooxindole tetrahydroquinolines in high yields (up to 98%) with good to excellent levels of diastereoselectivity (up to 99:1 dr). The catalytic enantioselective variant of this process was also investigated preliminarily with a chiral BINOL-derived phosphoric acid.

[Advance in research on endocardial fiborelastosis].

Endocardial fiborelastosis (EFE) is a common infantile myocardiosis. The pathogenesis of EFE may be associated with viral infection, genetic factors, immune factors and endocardial dysplasia. The fundamental pathological changes of EFE include hyperplasia of endocardium elastic fibers and collagen fibers.

Highly efficient and stereoselective construction of dispiro-[oxazolidine-2-thione]bisoxindoles and dispiro[imidazolidine-2-thione]bisoxindoles.

An efficient and stereoselective reaction between 3-isothiocyanato oxindoles and isatins/isatinimines has been developed to afford structurally diverse dispiro[oxazolidine-2-thione]bisoxindoles and dispiro[imidazolidine-2-thione]bisoxindoles in excellent results under mild conditions. The potential of asymmetric induction by means of a chiral auxiliary was explored. The isomers are separable, and products could be isolated as single diastereomers by column chromatography.

Diastereo- and enantioselective conjugate addition of 3-substituted oxindoles to nitroolefins catalyzed by a chiral Ni(OAc)2-diamine complex under mild conditions.

A simple catalyst system assembled from an enantiomerically pure diamine ligand and Ni(OAc)(2) efficiently generates chiral metal enolates derived from 3-substituted oxindoles bearing an N-1 carbonyl group. The enolates smoothly undergo diastereo- and enantioselective conjugate addition to a wide range of nitroolefins under mild reaction conditions, furnishing 3,3-disubstituted oxindole products bearing two vicinal quaternary/tertiary stereocenters in 74-95% yields and 60:40 to 99:1 dr, 71-97% ee.

[Clinical analysis of 68 cases of childhood dilated cardiomyopathy].

Objective: To study the ECG features in children with dilated cardiomyopathy (DCM), and related factors for the occurrence of arrhythmia secondary to DCM.

Methods: Data from 68 children with DCM from January 1998 to March 2011 were studied. The children were classified into three groups: severe arrhythmia (n=42), non-severe arrhythmia (n=20) and non-arrhythmia (n=6).

[Studies and application of flow injection chemiluminescence in analytical chemistry].

At present, flow-injection chemiluminescence is of high sensitivity, fast analysis, low cost, wide linear response range, and simplified operation for trace analysis, and makes a feature of fast development and wide application. As a trace analysis method, it is infiltrated in diverse areas. The principle and characteristics of flow-injection chemiluminescence were expounded, and the chemiluminescence systems were introduced in detail in the present article.

[Voice fatigue test analysis in secondary school teachers].

Objective: To investigate the status of voice fatigue and throat disease in the secondary school teachers in Urumqi.

Methods: This study included 11 689 teachers from 109 secondary schools offered by Teaching and Researching Center of Urumqi as the second-stage random sampling. Among them, 3217 teachers were selected to carry out voice fatigue test and routine examination of throat.

[Fluorescence research on reaction mechanism of nucleic acid with small organic molecules].

The interaction mechanism of nucleic acid with small organic molecules plays an important role in the recognition of the structure and function of nucleic acids, which can also reveal the biological function of nucleic acids and the mechanism of some drugs. Research on the interaction between nucleic acid and small organic molecules plays an important part in simulating the life process and exploring the essence of life. In the present article, detailed description of the fluorescence spectroscopy research methods used in this field is presented.

Spectroscopic studies on the interaction of a water-soluble cationic porphyrin with proteins.

The interaction of a water-soluble cationic porphyrin, meso-tetrakis (4-N,N,N-trimethylanilinium) porphyrin (TMAP), with two proteins, bovine serum albumin (BSA) and human serum albumin (HSA), was studied by UV-vis absorption spectroscopy, fluorescence spectroscopy, fluorescence anisotropy and synchronous fluorescence spectroscopy at neutral aqueous solutions. Free base TMAP bound to proteins as monomers and no aggregation was observed. The binding of TMAP quenched the fluorescence of the protein.

[Clinical observation on acupuncture combined with medicine for treatment of infantile febrile convulsion].

Objective: To explore an effective therapy for treatment of infantile febrile convulsion.

Methods: Seventy infants of febrile convulsion were randomly divided into two groups, a combined acupuncture and drug group (n = 36) were treated with Xingnao Kaiqiao needling method with Shuigou (GV 26) selected as main combined with intramuscular injection of luminal and intravenous perfusion of diazepam; and a drug group (n = 34) treated with simple intramuscular injection of luminal and intravenous perfusion of diazepam. Their therapeutic effects, the time of inducing the stopping convulsion, and the recurrence rate were investigated.