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Biomedical subjects

C Yang

Publications and source records attributed to C Yang.

At least 307 records · Page 17Linked to original sources
PubMed1998

[The study on the relationship between luteal phase serum sex hormone levels and pregnancy outcome in in vitro fertilization embryo transfer cycle].

OBJECTIVE: To study the influence of maternal endocrine factors on clinical pregnancy outcome in an in Vitro Fertilization Embryo Transfer (IVF-ET) program. METHODS: 62 IVF-ET treatment cylces were studied. Luteal phase serum sex hormone levels [estrogen (E2), progesterone (P), prolactin (PRL)] in natural and superovulation cycles were measured by radioimmunoassay and the clinical pregnancy outcome was observed. RESULTS: Serum luteal phase sex hormone levels were higher than in natural cycles (P < 0.05). P level and P/E2 ratio in progesterone supplementation group were higher than the group without progesterone supplementation (P < 0.05). In pregnancy group serum E2(4,885.5 +/- 1,269.0 pmol/L) was lower, PRL (66.4 +/- 26.8 micrograms/L), P/E2 (373.0 +/- 152.5) were higher than in nonpregnancy group (E2 6,091.2 +/- 1,522.1 pmol/L, PRL 49.1 +/- 24.1 micrograms/L, P/E2 227.4 +/- 116.7) (P < 0.05). When P/E2 ratio was between 300-400 and PRL level was between 60-100 micrograms/L, the clinical pregnancy rate increased markedly (P < 0.05). CONCLUSION: Luteal phase serum sex hormone level may influence embryo implantation in IVF-ET. In order to improve the clinical pregnancy rate, it is very necessary to supplement progesterone for the IVF-ET patients according to the different sex hormone levels.

Embryo Transfer↗
PubMed1998

[Neurilemmoma of the pharynx: 4 cases report].

This paper reported 4 cases of neurilemmoma of the pharynx so as to introduce our clinical experience. Tumor body of 3 cases lay parapharyngeal space, and other one did retropharyngeal space. Among 4 cases, tumor body of two cases derived from vagus nerve, one from hypoglossus nerve, and one from pharyngeal plexus likely. The diagnosis of these cases were verified by operation and pathological observation. They didn't recurred after 3 years of following-up. The points for attention in diagnosis and treatment of this disease were discussed.

Adult↗
PubMed1998

[Analysis of paracetamol, caffeine and chlorphenamine maleate in suxiaoshangfeng capsules by capillary gas chromatography].

A simple and rapid method for simultaneous determination of paracetamol, caffeine and chlorphenamine maleate in Suxiaoshangfeng capsule by capillary gas chromatography with n-hexadecane as internal standard has been reported. In the capsule, the three components can be separated on a 5% Ph-Me-Silicone column (2.65 microns x 0.53 mm x 10 m), with programmed column temperature from 180 degrees C to 230 degrees C at 8 degrees C/min, hold 6 min and then 230 degrees C to 260 degrees C at 10 degrees C/min, hold 10 min. Both the injector and FID detetor temperatures were 280 degrees C. N2 flow rate was 3.5 mL/min and H2 35 mL/min. The injection volume was 1 uL with splitting ratio of 1/25. These components were identified by their retention times and quantitatively determined by their peak areas. The calibration curves were, r = 0.9996 for paracetamol, r = 0.9984 for caffeine and r = 0.9996 for chlorphenamine maleate. The linear ranges were 4.0-20 g/L, 0.15-0.75 g/L and 0.080-0.40 g/L, respectively. The average recoveries were 99.62% (RSD = 0.40%, n = 5), 96.46%. (RSD = 1.32%, n = 5) and 98.55% (RSD = 0.65%, n = 5), respectively.

Acetaminophen↗
PubMed1998

[Determination of organochlorine pesticide residues in herba Asari by GC].

OBJECTIVE: To provide a theoretical guide for the production and application of Herba Asari. METHOD: A GC method for multiresidue analysis was used. RESULT: Fifteen samples of Herba Asari were detected with the method for the first time. The contents of organochlorine pesticide residues in most of the samples were under the Chinese national limits for grains and green vegetables (GB 2707-2763-81). The other samples were polluted seriously. CONCLUSION: Some suggestions have been put forward to help keep down pesticide residue pollution in Chinese herbal medicines.

Chromatography, Gas↗
PubMed1998

[Arthroscopic sclerotherapy and suturing for disc displacement of the TMJ].

OBJECTIVE: The generation of the scar using TMJ arthroscopic sclerotheray in retrodiscal tissue needs some weeks. As the sclerotherapy can't fix disc reposited at once, we designed some new methods of discal traction suture with posterior sclerotherapy and anterior release. METHODS: 30 cases with 15 joints of disc displacement with reduction and 16 joints of disc displacement without reduction were treated with the above-mentioned techniques. RESULTS: The mean follow-up period was 27 mon (range 6-39). According to the rang of interincisal distances during maximum active opening and painful level using a standard 100 mm visual analog scale, and, analyzing an eight-item jaw pain questionnaire and jaw function using 5 item jaw function questionnaire, the total success rate was 74.2% (23/31), the success rate of disc displacement with reduction was 93.3% (14/15), and the success rate of disc displacement without reduction was 56.4% (9/16). CONCLUSION: TMJ arthroscopic disc traction suture with posterior sclerotherapy and anterior release is effective on disc displacement. Diagnosis, treatment and post-operative evaluation can be performed in the same arthroscopic procedure.

Adult↗
PubMed1998

[A quick algorithm for detecting macro-particles distributed rarefiedly].

This paper presents a simple and quick algorithm, based on the principle of OR operation, for detecting macro-particles when the distribution of macro-particled is few and scattered. Counting and measuring the basic size parameters of macro-particles will be simultaneously accomplished by scanning the macroparticle image only once time.

Algorithms↗
PubMed1998

[The development of medical infusion monitoring and controlling network system].

The paper provided a medical infusion monitoring and controlling network system, in which the mainframe and its extensions can realize communication with each other by means of asynchronous serial port. At the same time, every extension can test infusion speed and adjust it to the presetting infusion speed gradually. The extensions also can alarm and stop infusion automatically when infusion will be over or there is a infusion malfunction.

Computer Communication Networks↗
PubMed1998

[Study on the volatile oils of Murraya microphylla].

The essential oils from the leaves of Murraya microphylla (Merr. et Chun) Swing. growing in Sangya city, Hainan province have been studied by GC-MS and 22 compounds have been isolated and identified. Major compounds are identified as beta-terpinene (27.86%), decahdro-1, 1,7-trimethylene-1H-cyclopop[e] azulene (24.572%), 1,2,3,4,4 alpha, 5,6,8 alpha-octahydro-7-methyl-1-(1-methyl) naphthalene (11.426%), 3-carene (10.125%), 1, 1-dimethy1-2-(3-methyl-1, 3-butadienyl) cyclopropane (5.581%). According to Mr. Bipeixi's opinion, it exists two distinct sections within Murraya microphylla (Merr. et Chun) Swing. belongs to Murraya section Bergera. Monoterpene must be the dominated volatile fractions according Li Qian's opinion, but it is a exception. Maybe it has special taxonomic significance.

Chromatography, Gas↗
PubMed1998

[Analysis of 12 cases of the intraosseous vascular malformation]

OBJECTIVE:This study is to discuss the main points of diagnosis and treatments of the intraosseous vascular malformations. METHODS: 12 cases have been compared and analyzed on the respects of the clinical and radiographic presentations and surgery methods. RESULTS: All the lesions were treated by radical resectins.Some of them also underwent the ligations of artery or transarterial embolizations. In two patients, vascularized bone graft with implants were carried out simultaneously. CONCLUSION: The results of this study indicate that the radiographys have no pathognomonic appearence. Surgery is widely accepted as a radical treatment at present. Nowadays, the main point is indicating to approach more on the functional restoration.

Journal Article↗
PubMed1998

[Application of simple OMA system for rapid spectrochemical quantitative analysis to steel sample composition].

In this paper, the experimental method and characteristic of a simple optical multichannel analyzer (OMA) system used for rapid spectrochemical quantitative analysis was introduced. Mangangese and chromium contents in different steel samples were measured. The reliability of experimental results was discussed according to the mathematical statistics theory. Analytical results were compared with those of chemical and ICP analysis.

English Abstract↗
PubMed1998

[Analysis of air pollutants with a combination of GC/FTIR and GC/MS].

In this paper, the air pollutants were analyzed with a combination of Gas chromatography/Fourier transform infrared spectroscopy (GC/FTIR) and Gas chromatography/Mass spectroscopy (GC/MS). The organic mixture was well separated after a careful adjustment of GC and IR parameters in GC/FTIR. In the identification of unknown components, MS is a main method, while IR is also useful to confirm the results.

English Abstract↗
PubMed1998

[Research of eximer laser-excited fast speed spectrochemical analysis].

Experimental method including XeCl eximer Laser-excited, optical multichannel analyzer (OMA) combined with the simultaneous spectrum widen technique was introduced in this paper. We programed data acquisition software and tested alloy-steel sample. The acquisition result of 150nm simultaneous spectrum was showed. The charaterics and significances of our research were discussed.

English Abstract↗
PubMed1998

[Determination of the content of serum calcium with methylthymol blue as chromogenic reagent].

It is reported in this paper that calcium can be determined with MTB as chromogenic reagent by isoabsorption dual-wavelength elimination. The measuring wavelength and referential wavelength were 613.7 and 590.0nm, respectively. No masking reagent was necessary in the analysis. The average recovery and RSD of calcium are 98.98% and 0.81%, respectively. Compared with titration, this method is rapid, simple and precise.

Absorption↗
PubMed1997

Mouse chromosomal locations of nine genes encoding homologs of human paraneoplastic neurologic disorder antigens.

The paraneoplastic neurologic disorders (PND) are a rare group of neurologic syndromes that arise when an immune response to systemic tumors expressing neuronal proteins ("onconeural antigens") develops into an autoimmune neuronal degeneration. The use of patient antisera to clone the genes encoding PND antigens has led to new insight into the mechanism of these autoimmune disorders. The tumor antigens can now be grouped into three classes: (1) neuron-specific RNA-binding proteins, (2) nerve terminal vesicle-associated proteins, and (3) cytoplasmic signaling proteins. To understand better the evolutionary relatedness of these genes and to evaluate them as candidates for inherited neurological disorders, we have determined the mouse chromosomal locations of nine of these genes-Hua, Hub, Huc, Hud, Nova1, Nova2, Natpb, Cdr2, and Cdr3. These data suggest that the Hua-Hud genes arose from gene duplication and dispersion, while the other genes are dispersed in the genome. We also predict the chromosomal locations of these genes in human and discuss the potential of these genes as candidates for uncloned mouse and human mutations.

Animals↗
PubMed1997

Electrokinetic Effects on Pressure-Driven Liquid Flows in Rectangular Microchannels

The effects of the electrical double layer near the solid-liquid interface and the induced electrokinetic field on the pressure-driven liquid flow through a rectangular microchannel are analyzed in this work. A nonlinear, two-dimensional Poisson-Boltzmann equation governing the electrical double layer field in the cross section of rectangular channels is numerically solved with the use of a finite-difference scheme. A body force caused by the electrical double field and the flow-induced electrokinetic field is considered in the equation of motion. An exact solution to this equation of motion in rectangular microchannels is obtained by employing the Green function formulation. The effects of the ionic concentration of the liquid, the zeta potential of the solid surface, and the size and the shape of microchannels on the fluid velocity distribution, streaming potential, volumetric flow rate, friction coefficient, and apparent viscosity are discussed. The results clearly show that for a liquid solution of low ionic concentration and a solid surface of high zeta potential the liquid flow in rectangular microchannels is significantly influenced by the presence of the electrical double layer field and hence deviates from the flow characteristics described by classical fluid mechanics. Copyright 1997 Academic Press. Copyright 1997Academic Press

Journal Article↗
PubMed1997

Apoptosis of chondrocytes in transgenic mice lacking collagen II.

Previous work demonstrated that collagen fibrils were not detectable in the cartilage of transgenic mice homozygous for targeted inactivation of the collagen II gene. In the present work, we used the same mice to show that chondrocytes undergo apoptosis in the absence of collagen II, the major component of the extracellular matrix of cartilage. The chondrocytes in the homozygous mice had condensed nuclei, fragmentation of nuclear DNA, and decreased levels of the Bcl-2 protein. These results provide direct evidence that cartilage extracellular matrix lacking collagen II cannot support the survival of chondrocytes. In addition, the results suggest that apoptosis may play a role in degenerative connective tissue diseases such as osteoarthritis in which there is extensive tissue loss.

Animals↗