Objective To investigate the effects of dilution of whole blood in vitro with different amount of normal saline on blood coagulation.Methods Nineteen healthy adult volunteers were enrolled in the present study.Venous blood samples obtained from each volunteer were diluted with normal saline in saline/blood ratio(v/v) of 2∶8(20%),3∶7(30%),4∶6(40%),5∶5(50%) and 6∶4(60%).Undiluted blood was considered as control.Coagulability of each group was determined with Sonoclot coagulation and platelet function analyzer,including activated clotting time(ACT),clot rate(CR),time to peak(TP),maximal clot signal(MCS),and platelet function(PF).Results 1) ACT: Compared with control value,ACT was significantly shortened with 20% dilution(P

Objective To investigate the action of integron-mediated multidrug resistance in clinical multi-resistant Pseudomonas aeruginosa.Methods The strains of multi-resistant Pseudomonas aeruginosa were selected with K-B susceptibility method. The three-dimensional method was taken to differentiate the various beta-lactamases. The integron was determined by PCR with integron-specific primer. DNA sequencing was also used to analyze resistance-related gene in the integron in multi-resistant Pseudomonas aeruginosa.Results The positive rate of integron detection in multi-resistant Pseudomonas aeruginosa was 42.4%.Three kinds of different length integron were found .They were 750bp,1 000bp and 2 500bp and aadB,aadA2,aadB,aac6-II and PSE-1 were the resistance-related gene cassette in the integrons.Conclusions Integron took part in mutiple resistance in multi-resistant Pseudomonas aeruginosa.We should pay more attention to integron-mediated horizontal transference of mulidurg resistance to lessen the occurrence of multi-resistant strains.

The reverse problem of Electrical impedance tomography(EIT) is a highly ill-posed problem.It is concluded that spatial prior information could improve the final image quality.This paper proposes a new method for obtaining prior information.By this method,the inspected cross-section contour and internal structure for EIT can be achieved.

Objective To compare the performance of novel Ag/AgCl pulverized electrodes with conventional Ag/AgCl coating electrodes in cerebral application of Electrical Impedance Tomography(EIT).Methods Based on the EIT system developed by our group,raw data were measured on a phantom and an adult volunteer,with Ag/AgCl coating electrodes and pulverized electrodes,respectively.The performances of electrode systems were evaluated in contact impedance and two other figures(the high-frequency SNR,HFSNR;the low-frequency SNR,LFSNR).Results Ag/AgCl pulverized electrode plays a better performance in resisting noise and keeping stabilization.Conclusion Ag/AgCl pulverized electrode develops the needs of imaging and monitoring human brains in EIT more availably.

Objective To construct humulus scandens pollen major allergen DNA vaccine pcDNA-LC2 and evaluate its immunogenicity. Methods Humulus scandens pollen allergen gene was digested from recombinant plasmid pTripIEx2-LC2 by EcoRⅠ and HindⅢ of restriction endonuclease, and then inserted into expression vector pcDNA3.1(-). A large amount of endotoxin pcDNA3.1-LC2 purified plasmid was extracted after successful construction, and animal experiment was carried out to study its immunocompetence. Results Sequencing results showed that 672bp in the coding sequence of frames of recombinant pcDNA3.1-LC2 was in line with the original base line, without deletion or mutation. pcDNA3.1-LC2 of pollen allergen humulus scandens allergen vaccinated BALB/c mice. Double immunodiffusion test showed that pcDNA3.1-LC2 could be expressed and produce antibodies in mice. Conclusion Humulus scandens grass pollen major allergen DNA vaccine pcDNA3.1-LC2 has been successfully constructed. It can be expressed in mice, produces humulus scandens grass pollen allergen specific antibody and has a good immunogenicity.

Objective To provide the hardware system of EIT with an excellent direct current(DC) power source. Methods The spectrums of the outputs of DC power source and the driving source were analyzed by means of Spectrum Analyzer- E4408B when EIT system was respectively powered by battery, linear power source and switching power source. Based on the numbers and power levels of the spurs of the three power sources and the numbers and power levels of the interferences within the driving source, the influence of the three power sources on the error of measuring was estimated. Meanwhile the EIT system did data acquisition, the overall signal-to-noise-ratio(SNR) of the three power sources at the 18 frequencies were calculated and the influence of the three power sources on the error of measuring was judged. Results With respect to the numbers and power levels of the interferences within the driving source when EIT was powered respectively by the three power sources, the battery output 6 interferences, the highest power of which achieved -78.25 dBm; the linear power source output 6 interferences, the highest power of which achieved -67.11 dBm; the switching power source output 15 interferences, the highest power of which achieved -35.83 dBm. The overall SNRs of the battery at the 18 driving frequencies were higher than that of the linear power source, and the overall SNRs of the linear power source were higher than that of the switching power source. Conclusion The power mode of battery is the best for the hardware of EIT among the three power sources.

Polyethersulfone hollow fiber membranes were prepared from polyethersulfone/N, N-Dimethylacctamide/poly (N-vinyl-2-pyrrolidinone) systems by dry/wet phase inversion process using water as coagulation bath. The effects of coagulation bath temperature and air gap distance on the surface structure, cross section structure and water flux of membranes were discussed. As increasing the temperature of coagulation bath and the air gap distance, the size of the pores at the surface effectively increased, while the finger-like structure under the outer surface changed to a sponge-like structure.

BACKGROUND:Patients with Parkinson disease (PD) are always supplied exogenous dopamine so as to balance a disproportion of neurotransmitter.However,a long-term administration may easily cause drug resistance;therefore,it is not able to solve nerve injuries at all.A lot of researches suggest that ganglioside can promote neural axon growth,improve neurotrophy,and resist cellular toxicity mediated by glutamic acid (GA).OBJECTIVE:To probe into the duration and effect of oraL administration of ganglioside on improving clinical symptoms of PD patients.DESIGN:Retrospective case analysis.SETTING:Department of Internal Medicine.Shanghai Electric Power Hospital;Departments of Neurosurgery and Internal Medicine,the First Affiliated Hospital of Kunming Medical College.PARTICIPANTS:A total of 6 344 PD patients were selected from Heilongjiang,Hebei,Shandong,Henan, Beijing,Jiangsu,Gansu,Qinghai.Guizhou,Fujian,Hunan,Shanxi, Hubei,Sichuan,Chongqing,Jiangxi, Shanghai and Yunnan from January 2001 to January 2005.All patients met the diagnostic and typing criteria of PD in Practical Neurology.They orally took≥10 mg/d ganglioside for more than 1 month,and all of them were provided the consent.METHODS:Patients who were treated with oral ganglioside accepted neural functional rehabilitation. Every oral solution of ganglioside contained 0.25 g/L ganglioside [including monosialoteterahexosyl ganglioside 1 (21%),diplo-sialoteterahexosyl ganglioside 1a(40%),diplo-sialoteterahexosyl ganglioside 1 b(16%),and tri-sialoteterahexosyl ganglioside 1b(19%)],and patients fastingly took two ampoules in every morning and 2 in every evening before sleeping, or took 4 ampoules in every evening before sleeping. Every 3 months was regarded as a course, and patients were always treated for two or three courses;especially,patients having a long-term duration were treated for above 4 courses.Regular follow-up was performed during the administration to observe the improvements of PD patients on the aspects of chatter, myotone, bradypraxia,posture irregularity, etc. Effective evaluation: Iilness improvements of PD patients who orally took ganglioside were observed within 3,6,9 months and 1 year.Excellent effective: Chatter and myotone disappeared after gradually stopping administration of dopamine preparation;improvement: Symptoms mentioned above were relieved after gradually reducing administration of dopamine preparation (effect=apparent effect+improvement);inefficacy:Symptoms mentioned above were not changed.MAIN OUTCOME MEASURES:Effect at various time Points of administration.RESULTS:Among 5 937 patients who met the inclusion criteria,all of them were involved in the final analysis without any loss.① Improvement of clinical symptoms at various time points of administration:There were 669 PD patients with the effective improvements within 1-3 months.941 within 4-6 months and 1713 within 7-12 months.The total effective rate was 56%.② Therapeutic effective rate of PD patients at various administrating times:The therapeutic effective rates of patients who received administration from 1 to 3 months,from 4 to 6 months and from 7 to 12 months were 30%,57%and 84%respectively.The rate was higher of patients administrated from 4 to 6 months than.of those from 1 co 3 months(P<0.05),and also higher of those from 7 to 12 months than of those from 4 tp 6 months and from 1 to 3 months (P<0.05,P<0.01).CONCLUSION:Ganglioside can effectively improve clinical symptoms,such as chatter,myotone,bradypraxia,posture irregularity,etc.In addition,it has a better effect during a long-term administration.

Objective To make a bioinformatical analysis of the specific allergen pTSX1 cDNA clone obtained from Humulus pollen in allergic asthma by immunological screening and gene cloning. Methods Bioinformatical approaches, including sequence analysis, sequence alignment, genetic makeup, protein structure and function prediction, were used. Results The analysis of the specific allergen pTSX1 cDNA showed that the gene had no reading frame and coded a protein with 204 amine acids. The analysis of amine acids sequence coded by the pTSX1 cDNA showed that the protein identity of this gene product might be one of ribosomal proteins. Conclusion The pTSX1 cDNA cloned from Humulus pollen in allergic asthma is a new gene, and the protein coded by pTSX1 gene may be one of ribosomal proteins.