The horseradish peroxidase labeled affinity purified mice anti-UEA (Urea soluable egg antigen of Schistosoma japonicum) antibody was used in enzyme-linked immunoe ectrotransfer blot (EITB) te monitor the changes after UEA being processed by M?.The immune respon-sive peptides were delected in the culture supernatant and homogenate of M? pulsed with UEA in vitro (M?+).After processing by M? the high molecular weight UEA was cleaved into low molecular weight peptides,as shown,by the reactive bands.They markedly differed from that native UEA or trypsin-digested UEA; The bands of M? supernatant and homogenate showed similarity with certain quantitative differences.According to the result described above,we considered: 1.UEA could be processed into smaller pieces by M?,the style of processing is cleavage.2.The processed peptides might be released to extracellular environment.

Indirect ELISA was employed to monitor the serum anti-UEA(urea soluble egg antigen of Schistosoma japonicum )antibody level of mice immunized by a. UEA pulsed macrophage (M + ); b. Cultural supernatant of M+; c. paraformaldehyde fixed M(P -M)pulsed with UEA; d. Ammonium chloride treated M0 (NH4Cl-M0) pulsed with UEA, e. P -M0 pulsed with trypsin digested UEA (T-UEA ); f. NH4C1-M pulsed with T-UEA. The normal M its supernatant and the culture media RPMI 1640 acted as the negative control.The results showed : 1. Serum anti-UEA antibody levels of mice immunized by a and b raised markedly, indicating that the immunogenicity of UEA might be kept up after M processing and the antigenic message could be transferred either by the M+ or by its supernatant; 2. Mice immunized by c and d gave similar results, but the anti-UEA antibody level of the former was higher than that of the latter, suggesting that polyformaldehyde could not alter the UEA binding site on the surface of M; 3. In the case of mice immunized by e and f , the antibody levels were much lower than that of mice immunized by c and d, suggesting that UEA binding sites on M surface as well as UEA immunogenicity could be changed by trypsin.

Abstract: Objective　To analyze the vaccination status of SARS-CoV-2 in children, and explore the relationship between SARS-CoV-2 vaccination and COVID-19 in children. Methods　A retrospective study was conducted to analyze the clinical data of 335 cases of SARS-CoV-2 Omicron variant infection from February 15, 2022 to March 18, 2022 in Shenzhen Third People's Hospital. Results　Among 335 children with SARS-CoV-2 infection, 174(51.9%) cases were vaccinated with the SARS-CoV-2 vaccine; 33(31.4%) cases were vaccinated in the 3-<6 years old group; 141(61.3%) cases were vaccinated in the 6-<14 years old group. There was a statistically significant difference in the proportion of SARS-CoV-2 vaccination between the 6-<14 years old group and the 3-<6 years old group (χ2=26.1, P<0.05). In the study cohort, 3-<6 years old group and 6-<14 years old group, there was no significant difference in the incidence of COVID-19 in the vaccinated group compared with the unvaccinated group (P>0.05). In the study cohort, the proportion of confirmed cases of 1 dose of SARS-CoV-2 vaccine and 2 doses or more of SARS-CoV-2 vaccine was 89.5% (68 cases) and 77.6% (76 cases), respectively; in the 6~<14 years old group, the proportion of confirmed cases of 1 dose of SARS-CoV-2 vaccine and 2 doses or more of SARS-CoV-2 vaccine was 90.0% (54 cases) and 76.5% (62 cases), respectively; the differences were statistically significant (χ2=4.264, P<0.05; χ2=4.279，P<0.05). The IgG levels of 18.28 (6.61, 55.2) AU/mL and 58.3 (25.85, 131.41) AU/mL in the study cohort who were vaccinated for 1 dose, 2 doses and more, respectively; the IgG levels of 20.13 (8.33, 44.33) AU/mL and 56.57 (25.85, 150.07) AU/mL in the 6~<14 years old group who were vaccinated for 1 dose, 2 doses and more, respectively; and the differences were statistically significant (Z=-4.37, P<0.05; Z=-3.96, P<0.05). Conclusions　Children who received 2 doses of SARS-CoV-2 vaccine have a lower incidence of COVID-19 and higher levels of SARS-CoV-2 antibodies compared with who received 1 dose . It is recommended that children are advised to be vaccinated against the COVID-19.

OBJECTIVETo evaluate the clinical effects of short-segment transpedicular fixation and vertebroplasty via paraspinal intermuscular approach in treating thoracolumbar fractures.

METHODSFrom January 2009 to January 2012,18 patients with thoracolumbar fractures without neurological symptoms were treated with short-segment transpedicular fixation and vertebroplasty via paraspinal intermuscular approach. There were 11 males and 7 females, aged from 52 to 76 years old with an average of 62.2 years. The duration from injuries to surgery ranged from 8 h to 7 d with an average of 4.2 d. According to the Denis fracture classification, 12 cases got compression fractures and 6 cases got burst fractures.

LOCATION6 vertebra with T12, 9 with L1, 6 with L2, and 3 with L3. Anterior vertebral body height, the sagittal Cobb angle, the sagittal index (SI), condition of internal fixation failure and recurrent kyphosis were observed.

RESULTSAll patients were followed up for 12-28 months with an average of 16.5 months. Operation time was from 80 to 130 min with a mean of 95 min and bleeding volume during operation ranged from 100 to 180 ml with a mean of 145 ml. Anterior vertebral body height ratios preoperation, 3 days after operation and final follow-up was 54.3 +/- 2.8, 90.9 +/- 1.5, 88.6 +/- 1.7, respectively; sagittal Cobb angle was (27.8 +/- 2.5) degrees, (5.3 +/- 0.8) degrees, (6.3 +/- 1.4) degrees, respectively; sagittal index was 52.3 +/- 3.8, 89.2 +/- 5.2, 86.4 +/- 4.5, respectively. Data obtained 3 days after operation obviously improved than preoperation, and there was no statistically significant difference between 3 days after operation and last follow-up. No internal fixation failure, neurological complications and recurrent kyphosis were found.

CONCLUSIONTreatment of thoracolumbar fractures with short-segment transpediclar screw fixation and vertebroplasty via paraspinal intermuscular approach can retain the posterior ligament complex and restore the mechanical strength of the anterocentral column,which proved an ideal method for preventing the failure of internal fixation and reduction of post-traumatic segmental kyphosis.

Aged ; Bone Screws ; Female ; Fracture Fixation, Internal ; methods ; Humans ; Male ; Middle Aged ; Spinal Fractures ; surgery ; Thoracic Vertebrae ; injuries ; surgery ; Vertebroplasty ; methods

Objective To investigate whether PSD 93 reduce neurotoxity induced by platelet activating factor (PAF) and study on the mechanism of cell molecularbiology.Methods PAF treated the cultural cortex neurons in wild type and PSD 93 knockout mice and the cells were stained with PI/Calcein AM for apoptosis; neuronal viability was measured by MTT. The expression of PSD93 and PSD95 protein in neurons was tested by Western Blot.Results PSD 93 and PSD 95 expressed in wild type neurons and only PSD 95 expressed in PSD 93 knockout. Cortex neuronal apoptosis in PSD 93 knockout mice was lower then that in wild type ( P

Objective To explore the feasibility for determination of chloroform and tetrachloromethane in drinking water with DB-5, Rtx-1 and DB-1 capillary columns. Methods For the mild solubility of chloroform and tetrachloromethane in drinking water, chloroform and tetrachloromethane were analysed by static headspace gas chromatography with DB-5, Rtx-1 and DB-1 capillary columns and electron capture detectorECD, external standard method was used for quantification. Results Three kinds of columns were used for determination of chloroform and tetrachloromethane,the retention time was lower than 3 min, for chloroform and tetrachloromethane the average recovery rates were 92.06%-104.95% and 78.33%-103.22% respectively, RSD were 2.06%-2.71% and 1.76%-5.59% respectively. Conclusion DB-5, Rtx-1 and DB-1 capillary columns are suitable for determination of chloroform and tetrachloromethane in drinking water.

Objective To approach the feasibility of identifying the specific biomarker of ovarian cancer by SELDI TOF mass spectrometry. Methods The relative contents of serum protein of both 24 the patients with ovarian cancer and 56 cases of healthy people were tested by IMAC3 chip and proteinchip reader (CipherGen Inc., VS). Results On the M/Z values ranged from 4000Da to 10000Da, there were six kinds of protein contents in the serum of the were obviously different between the two groups. Among them the serum protein of M/Z value 4472Da may be regarded as a specific biomarker of ovarian cancer. In the learning mode, all the 24 patients and 56 control people were diagnosed and distinguished out correctly, while in the test mode, 23 patients were correctly diagnosed and 56 control people were distinguished out, the total accuracy was 98 75%(79/80), and the sensitivity and specificity were 95 8%(23/24) and 100%(56/56), respectively. Conclusion Ovarian cancer can be quickly and correctly diagnosed by this method with high sensitivity and specificity. That will be widely used in clinical application

BACKGROUND: When the dynamic equilibrium between oxidation system and anti-oxidation system in the body is upset, the overly produced active oxygen-derived free radicals will attack the target organs, thus resulting in the damage to organs and big molecules, and then diseases. Total anti-oxidation capacity (T-AOC), superoxide dismutase (SOD), and nitric oxide synthase (NOS) activity are the majorindexes for the defense system of the body, and their status is closely related to diseases. OBJECTIVE:To explore the level of T-AOC, SOD and NOS in serum,and find out its relationship with lifestyle. DESIGN:Single sample investigation. SETTING:Department of Health Laboratory Technology, College of Public Health of Harbin Medical University. PARTICIPANTS:Totally 531 residents of Bin County aged 20 to 70years were recruited between September 2000 and May2001. MATERIALS:The reagents kits of T-AOC, SOD and NOS were manufactured by Nanjing Jiancheng Bio-engineering Institute. METHODS:The investigators surveyed the residents with the same questionnaire. Questionnaire was made and the investigators were trained in advance. The questionnaire was filled in item by item as required. Questionnaire items consisted of the general situation, financial status, dietary habit, hobby, status of health care, and mental factor. Finally 95 investigation indexes were completed. The activity of serum T-AOC, SOD and NOS of the 531 residents in Bin County was determined, respectively, with reagent kits produced by Nanjing Jiancheng Bio-engineering Institute. The lifestyle factors were analyzed by multivariate stepwise regression analysis,and informed consent was obtained from the participants. MAIN OUTCOME MEASURFS:① Serum T-AOC, SOD and NOS in the participants; ② lifestyle factors affecting T-AOC, SOD and NOS.RFSULTS:According to actual analysis, the 531 participants entered the results analysis. T-AOC was measured in 489 participants, SOD in 525participants, and NOS in 531 participants. ① Indexes of the participants:T-AOC of the males was obviously higher than that of the females [(20.01±7.21), (15.25±6.22) kU/L, P ＜ 0.05]. SOD of the males was slightly lower than that of the females while NOS of the males was slightly higher than that of the females, but there was no significant difference. ②Multivariate stepwise regression analysis showed that risk factors related to T-AOC were gender difference (OR=2.188), educational level (OR=1.859),and the presence of rheumatism, respectively (OR =1.142). SOD-related risk factors were educational level (OR=1.584), years of spirit drinking (OR =1.048), presence of nephritis (OR=1.093), and irradiation (OR=1.770);frequency of tea drinking was a beneficial factor (OR=0.800). NOS-related risk factors were the average amount of cigarette smoking (OR=1.194) and the times of weekly spirit drinking (OR=1.368). However, the beneficial factor that affected serum NOS was the frequency of weekly mutton eating (OR=0.458) CONCLUSION:This experiment revealed that the ability to clean free radical in the 531 subjects was good and that it was better in males than in females. The increased educational level and presence of rheumatism can decrease T-AOC. Drinking, smoking and irradiation decrease SOD activity while the frequency of tea drinking and mutton eating are beneficial factors.

Objective To study genotyping and molecular epidemiology distribution of GBS pathogenic strains of GBS positive pregnant women in Guangzhou,for GBS pathogenic strains of rapid molecular diagnosis and epidemiological surveillance pro-vide certain theoretical basis and method.Methods In the Guangzhou area,used multi stage stratified sampling method col-lecting GBS positive pregnant women’s reproductive tract specimens from January to December 2015,drug sensitivity quality control standard strains:Streptococcus pneumoniae (ATCC49619)and Staphylococcus aureus (ATCC25923),took culture of bacterial,strain,identification,DNA extraction,PCR,gene detection method,through the relevant software for data analy-sis,analyzed GBS strains of gene and molecular epidemiology.Results In the study,collected 2 812 samples of secretions,af-ter identification of strains isolated from 178 strains of pathogenic GBS strains,the detection rate was 6.33%.GBS patho-genic strains to linezolid vancomycin,penicillin,nitrfurantion and other antimicrobial drug resistance rate was 0,GBS parho-genic strains to ampicillin,ciprfloxacin moxifloxacin and levofloxacintesistant parts,the restance rates were 1.1%,16.9%, 18.0% and 22.5%,but GBS pathogenic strains to erythromycin,clindamycin tetracydine antibiotics showed a high resistance rate,the resistance rates were 50.6%,47.8%(of which 20 cases of erythromycin induced clindamycin resistance accouted for 23.5%)and 73.0%.Among them,65 strains of GBS detected the mreA gene,56 strains of GBS detected the ermB gene,36 strains of GBS detected the mefA gene,28 strains of GBS detected the mefE gene,5 strains of GBS detected the ermA gene, ermC gene was not detected in the gene.Among them,carried five multidrug resistance gene of 3 strains (1.6 9%)and 4 kinds of resistant gene carried with 15 strains (8.43%),carried three resistance genes of 19 strains (10.67%),2 kinds of resistant gene carrying a 25 strains (14.04%),carried the resistance gene of 5 strains (2.81%),did not carry resistance gene of 1 strain (0.56%).The nucleotide sequences of the five drug resistance genes were 100%,and no gene mutation oc-curred.Conclusion The main GBS disease resistant gene was mreA,ermA,ermB,mrfA,mefE and its nucleotide sequence homology was 100%.The clinical need to strengthen the detection of resistant gene and molecular level and guide clinical more scientific and rational drug use.

Objective: To establish the methods for extraction and isolation of punicalagin from pomegranate peel, and further study the purification and quantification of punicalagin. Methods: Using an ultrasonic-assisted extraction method, punicalagin in pomegranate peel was extracted at room temperature by 50% ethanol with 20-fold volume of raw material. The content of punicalagin in the crude extract was determined by HPLC. To optimize the purification process of punicalagin, static adsorption and desorption experi-ments were employed to study five kinds of macroporous adsorbent resins (D101, A8-8, NKA-9, HPD-100 and HPD-500) for the one with the highest purification efficacy of punicalagin. In addition, the technical parameters of the macroporous adsorbent resin were opti-mized to obtain punicalagin with higher purity. Punicalagin was further separated and purified by using a reverse phase MCI GEL CHP20P column. Results:HPD500 resin showed the best ability to absorb and separate punicalagin in among five kinds of macro-porous adsorbent resins. The best technical parameters were as follows:the mass concentration of sample solution was 15 mg·ml-1 , the loading amount was 2BV, the pH was 2 and the eluting solvent was 8BV of 30% ethanol. With the best process as described a-bove, the content of punicalagin extracted from pomegranate peel increased from 10. 3% to 30. 7%. The obtained punicalagin could be further purified to 61. 3% from 30% in ethanol eluate by the reverse phase MCI GEL CHP20P column. Conclusion:HPD500 resin is the most effective in the purification of punicalagin from pomegranate peel, and the content of punicalagin can be dramatically increased after the purification by a reverse phase MCI GEL CHP20P column. The optimized process shows good reproducibility and stability.