Confirmatory testing of 120 positive HIV antibody screening samples in Lanxi City / 预防医学

Objective@#To analyze the confirmatory test results of 120 positive HIV antibody screening samples in Lanxi City, Zhejiang Province, so as to provide insights into AIDS detection and control. Methods Western blotting confirmatory assay was performed on 120 positive HIV antibody samples from HIV screening laboratories in Lanxi City from 2020 to 2022. The confirmatory test results were determined according to the “National Technical Guidelines for AIDS Testing (2020 revision)” and “Diagnosis for HIV/AIDS” (WS 293-2019), and the positive rate of confirmatory test and band distribution were analyzed. @*Methods @#Western blotting confirmatory assay was performed on 120 positive HIV antibody samples from HIV screening laboratories in Lanxi City from 2020 to 2022. The confirmatory test results were determined according to the “National Technical Guidelines for AIDS Testing (2020 revision)” and “Diagnosis for HIV/AIDS” (WS 293-2019), and the positive rate of confirmatory test and band distribution were analyzed.@*Results@#Among 120 positive HIV antibody screening samples, there were 100 HIV-1 antibody positive samples (83.33%) as revealed by Western blotting confirmatory assay, 6 HIV antibody negative samples (5.00%), and 14 HIV-1 indeterminate tests (11.67%). There were 72 men and 28 men tested positive for HIV-1 antibody, with a male to female ratio of 2.57∶1, and there were 88 patients at ages of 20 to 59 years (88.00%), with the highest frequency of gp160, gp120 and p24 bands (100.00%). The most common Western blotting band pattern was p24 among HIV-1 indeterminate tests (78.57%). Among all HIV-1 indeterminate Western blotting tests, 6 cases were tested positive for HIV-1 antibody (gp160+p24) and 8 cases tested negative for HIV antibody during the follow-up period. @*Conclusions@# The prevalence of HIV-1 antibody was 83.33% in 120 positive HIV antibody screening samples in Lanxi City. The three most common Western blotting band patterns were gp160, gp120 and p24. The follow-up requires to be reinforced in HIV-1 indeterminate Western blotting tests for early identification and early intervention.

Prenatal Genetic Diagnosis and Origin Analysis of Rare Complete Translocation Trisomy 18 / 中山大学学报(医学科学版)

ObjectiveTo discuss the origin of rare abnormal karyotypes of fetuses with high risk of trisomy 18 revealed by non-invasive prenatal testing （NIPT） and its impact on fertility. MethodsThe cytogenetic and molecular genetic analyses were performed on the abnormal chromosomes of a prenatally diagnosed fetus with rare complete translocation trisomy 18. Using the keywords “translocation trisomy 18” or “trisomy 18 translocation” in both Chinese and English， we searched PubMed， CNKI， SinoMed， WanFang Data， CQ VIP and the Chinese Medicine database. The relevant case series were retrieved and critically appraised. ResultsG-banded karyotype analysis showed that the maternal karyotype was 46，XX，t（9；18）（q31.2；q23） and the fetal karyotype was 47， XN， t （9； 18） （q31.2；q23）mat， +18， which was a rare complete translocation type of trisomy 18. The SNP array revealed the fetus had increased copy number of chromosome 18 and two complete chromosome 18 inherited from the mother with balanced chromosomal translocation. Literature search found two children with complete translocation trisomy 18 reported abroad. Both of them had trisomy 18 phenotype and originated from the balanced translocation between parental chromosome 18 and other chromosomes. ConclusionNIPT gives an effective advance warning of trisomy 18. SNP array not only improves the detection rate of chromosomal abnormalities， but also helps identify the origin. The karyotype is still the gold standard for prenatal diagnosis.

Ambient air pollution in the development and exacerbation of autoimmune diseases: a systematic review of literature / 中华风湿病学杂志

Objective:To systematically evaluate the role of air pollutants in the development and exacerbation of autoimmune rheumatic diseases.Methods:We followed PRISMA guidelines and searched EMBASE, Scopus, PubMed, and Cochrane Library databases using keywords and MeSH terms from inception to July 2019. Observational studies reporting the relationship between autoimmune rheumatic diseases and exposure to certain air pollutants were included. Screening of literature according to established inclusion and exclusion criteria. No meta-analysis but the qualitative analysis was conducted due to the high methodological heterogeneity.Results:A total of 24 studies were included. Rheumatoid arthritis (RA) ( n=6), anti-neutrophil cytoplasmic antibodies (ANCA)-associated vasculitis (AAV) ( n=1), ankylosing spondylitis (AS) ( n=1), systemic lupus erythematosus (SLE) ( n=3), childhood-onset systemic lupus erythematosus (cSLE) ( n=3), juvenile idiopathic arthritis (JIA) ( n=2), Kawasaki disease (KD) ( n=4), systemic autoimmune rheumatic diseases (SARD) ( n=4). The results of the study suggested that short-term elevation in particulate matter (PM)2.5 concentration was possibly associated with an increased risk of SLE and cSLE flare-ups, disease activity of AS, JIA and SARDs exacerbation. Studies demonstrated an increased risk of RA with cumulative exposure to carbon monoxide (CO), nitrogen dioxide (NO 2), ozone (O 3), and sulfur dioxide (SO 2). Only one study demonstrated an increased risk of KD admission with elevated O 3 levels. No association was found between AAV and ambient air pollution. Conclusion:Air pollution is likely to be involved in the development and exacerbation of certain autoimmune diseases. At the same time, the mechanism of autoimmune diseases of ambient air pollutants should be actively studied, so as to promote the early prevention of cardiovascular diseases.

Association of leptin and leptin receptor polymorphisms with coronary artery disease in a North Chinese Han population

Abstract INTRODUCTION: Leptin (LEP) is a peptide hormone that acts via leptin receptor (LEPR) binding. Genetic evidence from different human populations has implicated LEP/LEPR in the pathogenesis of coronary artery disease (CAD), and suggests that certain LEP/LEPR gene polymorphisms may increase the risk of CAD. The aim of this study was to assess two single nucleotide polymorphisms (SNPs) in LEP genes (rs2167270 and rs7799039) and two in LEPR genes (rs6588147, rs1137100) for association with CAD. METHODS: We enrolled 271 North Chinese Han CAD patients, and 113 healthy age- and sex-matched controls. Genomic DNA was extracted from whole blood, and the four SNPs were assessed using a MassArray system. RESULTS: The G allele frequency at rs2167270 was significantly higher among CAD cases than among controls. The AG genotype at rs7799039 was associated with a significantly decreased risk of CAD unlike the AA genotype used as the reference. The A allele was significantly associated with the CAD patient group. Interestingly, statistically significant differences in genotype and allele frequency at LEP rs2167270 and rs7799039 existed among females but not among males. CONCLUSIONS: The current study detected a significant association between genetic variations at LEP rs7799039 and rs2167270 and the risk of CAD in a north Chinese population, and revealed that LEP rs2167270 and rs7799039 gene polymorphisms might act as predisposing factors for CAD.

Knockout of glutathione peroxidase 5 down-regulates the piRNAs in the caput epididymidis of aged mice / 亚洲男科学杂志(英文版)

The mammalian epididymis not only plays a fundamental role in the maturation of spermatozoa, but also provides protection against various stressors. The foremost among these is the threat posed by oxidative stress, which arises from an imbalance in reactive oxygen species and can elicit damage to cellular lipids, proteins, and nucleic acids. In mice, the risk of oxidative damage to spermatozoa is mitigated through the expression and secretion of glutathione peroxidase 5 (GPX5) as a major luminal scavenger in the proximal caput epididymidal segment. Accordingly, the loss of GPX5-mediated protection leads to impaired DNA integrity in the spermatozoa of aged Gpx5

Detection of MSX1 gene mutations in patients with congenital tooth loss in Van der Woude syndrome / 口腔疾病防治

Objective@#To explore the relationship between MSX1 gene detection and tooth loss in a Van der Woude syndrome (VWS) family @* Methods @# DNA was extracted from the venous blood of 2 patients with dental hy⁃podontia in the 9th family of Van der Woude syndrome (VWS) families and 62 controls with complete dentition. Primers were designed for the MSXl gene. The coding regions of exons 1 and 2 of the MSX1 gene were amplified by PCR. The purified products of exons 1 and 2 of the MSX1 gene were sequenced and analyzed by sequence alignment @*Results@#The ivs2+68 C>T polymorphism in the MSX1 gene was found in the VWS9 members with tooth loss, and the VWS pa⁃tients with IRF6 gene mutations had increased tooth loss@* Conclusion@#Congenital tooth loss in the patients with con⁃genital missing teeth in VWS family 9 may be related to the ivs2 + 68 C> T polymorphism of the MSX1 gene.

Effect of moxibustion at "Guanyuan" (CV 4) and "Sanyinjiao" (SP 6) on bone morphology, metabolism and ERα of bone marrow mesenchymal stem cells in the ovariectomized rats / 中国针灸

OBJECTIVE@#To observe the effects of moxibustion at "Guanyuan" (CV 4) and "Sanyinjiao" (SP 6) on bone morphology, metabolism and ERα of bone marrow mesenchymal stem cells (MSCs) in the ovariectomized rats and explore the underlying mechanism of moxibustion at Guanyuan (CV 4) and Sanyinjiao (SP 6) on the regulation of bone metabolism.@*METHODS@#A total of 60 SD rats were randomized into a normal group (20 rats) and an ovariectomy group (40 rats). In the normal group, no any treatment was provided. In the ovariectomy group, the classical ovariectomy was adopted to set up the osteoporosis model. In the 13th week after ovariectomy, 10 rats were collected from each of the normal group and the ovariectomy group for model identification. After model identification, the ovariectomy group was subdivided into a model group, an estradiol group and a moxibustion group, 10 rats in each one. In the normal group and the model group, the gavage was provided with 2 mL 0.9% sodium chloride solution, once a day. In the estradiol group, the gavage was provided with 17β-estradiol 100 μg/(kg•d), once a day. In the moxibustion group, moxibustion was applied at "Guanyuan" (CV 4) and "Sanyinjiao" (SP 6), 15 min at each acupoint, once a day. The 6 treatments were as one course, with 1 day of interval, 12 courses were required. After 12-week intervention, the dual-energy X-ray was adopted to determine the bone mineral density (BMD) and bone mineral content of the whole body in living condition. After sacrificed, HE staining was adopted to observe femur structure, the enzyme-linked immunosorbent assay was to determine the absorbance of estradiol (E) and alkaline phosphatase (ALP) in serum and the real-time quantitative PCR method was to determine the mRNA expressions of ERα of MSCs in tibia and femur.@*RESULTS@#Compared with the model group, BMD was increased obviously in the pelvis and spine in the moxibustion group and the estradiol group (0.05). Compared with the model group, the bone trabeculas were stronger and well connected in the moxibustion group, indicated by HE staining. Compared with the model group, the concentrations of E in serum were increased obviously in the estradiol group and the moxibusiton group (both <0.01), and ALP concentrations reduced obviously in the estradiol group and the moxibustion group (both <0.001), the mRNA expressions of ERα in MSCs increased in the estradiol group and the moxibustion group (both <0.001).@*CONCLUSION@#Moxibustion at "Guanyuan" (CV 4) and "Sanyinjiao" (SP 6) effectively increases BMD and bone strength in the ovariectomized rats and the mechanism may be related to the improvement of serum E concentration, the decrease of serum ALP concentration and the up-regulation of mRNA expression of ERα in MSCs.

The relationship between calcaneal bone mineral density and bone mineral, fat and muscle content in adolescents / 中国学校卫生

Objective@#To investigate the correlation between calcaneal bone mineral density and bone mineral, fat and muscle content in adolescents.@*Methods@#A total of 368 adolescents who received health examination in Hainan People’s Hospital were selected as the study subject. Calcaneal bone mineral density, bone mineral content, fat content and muscle content of adolescents were measured. Bone mineral density and body composition of adolescents of different ages and sexes were compared. The correlation between calcaneal bone mineral density and bone mineral content, fat and muscle content were analyzed.@*Results@#The BUA, muscle mass and bone mineral content of boys were significantly higher than those of girls, and the fat content of boys was significantly lower than that of girls, the differences were of statistical significance(t=13.51, 10.65, 4.52, -7.55, P<0.05). Calcaneal bone mineral density in adolescents was positively correlated with BMI, bone mineral content and muscle mass(r=0.39, 0.42, 0.69, P<0.05). There were significant differences in BUA, BMI, muscle mass and bone mineral content among boys of different ages(F=7.95, 8.63, 6.96, 5.01, P<0.05). There were significant differences in BUA, fat, muscle and bone mineral contents among girls of different age groups(F=8.65, 10.33, 7.96, 4.87, P<0.05). There was no significant correlation between BUA value of calcaneus and BMI and muscle mass in adolescents aged 12, 13-year old(P>0.05), while BUA value of calcaneus in adolescents aged 14-year old, 15-year old and 16-year old was positively correlated with BMI and muscle mass(P<0.05).@*Conclusion@#Calcaneal bone mineral density in adolescents is closely related to bone mineral and muscle content, but not to fat content.

Analysis on clinical efficacy of minimally invasive distal gastric cancer surgery combined with D2 lymph node dissection / 局解手术学杂志

Objective To explore the clinical effect of minimally invasive distal gastric cancer surgery combined with D2 lymph node dissection. Methods From September 2010 to September 2012,95 cases of gastric cancer surgically treated from our hospital were selected. Among them,2 cases were converted to laparotomy by abdominal cavity,and a total of 93 patients were included in the study. According to dif-ferent surgical methods,there were 43 cases in the observation group and 50 cases in the control group. The observation group was treated with minimally invasive distal gastric cancer surgery combined with D2 lymph node dissection,and the control group was treated with open surgery combined with D2 lymph node dissection. The bleeding volume,ambulation time,operative time,hospitalization time,lymph node dissection and postoperative complications were compared between the two groups. The recurrence,metastasis and mortality during 1 year,3 years and 5 years follow-up were also compared. Results The bleeding volume in the observation group was less than that in the control group,and the off-bed activity occurred earlier than that in the control group. The hospitalization time was shorter in the observation group than in the control group(P<0. 05),but there was no significant difference in operative time between the two groups(P>0. 05). There was no statistical differ-ence between the number of lymph nodes in the first station, the number of lymph nodes in second stations and the total number of lymph nodes in the two groups(P>0. 05). The incidence of postoperative complications in the observation group(6. 98％) was lower than that of the control group (22. 00％)(P<0. 05). The two groups were followed up for 1,3 and 5 years,and the recurrence rate and mortality rate were low(P>0. 05). Conclusion minimally invasive distal gastric cancer surgery combined with D2 lymph node dissection has significant clinical effect,less blood loss,quicker postoperative recovery and fewer complications,as well as less recurrence and metastasis and death in long-term follow-up.

Hypothermia combined with dexamethasone reduces ICAM1 expression and protects spermatogenesis after testicular torsion-detorsion / 中华男科学杂志

<p><b>OBJECTIVE</b>To investigate the protective effect of hypothermia combined with dexamethasone on spermatogenesis and the expression of intercellular adhesion molecule 1 (ICAM1) after testicular torsion-detorsion.</p><p><b>METHODS</b>We made unilateral testicular torsion models in 100 pubertal male Sprague-Dawley rats by 720 degree torsion of the left testis and then randomly divided them into four groups of equal number to be treated with normal temperature + physiological saline (group A), hypothermia + physiological saline (group B), normal temperature + dexamethasone (group C), and hypothermia + dexamethasone (group D). After 48 hours, we collected the testes, observed pathological changes of the testicular tissue by HE staining under the light microscope, detected the apoptosis of spermatogenic cells by TUNEL, and determined the expression of ICAM1 by Western blot.</p><p><b>RESULTS</b>HE staining showed different degrees of testicular tissue injury in the four groups of rats, most obvious in group A, but mild in the other three. The ICAM1 protein expression was significantly higher in group A (0.68 +/-0. 03) than in B (0. 49 +/- 0. 06, P <0. 05) , C (0. 46 +/- 0. 09, P < 0.05) , and D (0.17 +/- 0.08, P <0.01). The nuclei were deep brown or brown. Lots of apoptotic spermatogenic cells were seen in the torsion testis of group A, with a significantly higher apoptosis index ( [33. 13 +/- 3.21 ]%) than in B ( [ 17. 12 +/-5.23 ]%, P < 0.05), C ([14.13 +/- 2.03]%, P <0.05), and D ([9.05 +/- 1.03]%, P <0.01).</p><p><b>CONCLUSION</b>Hypothermia combined with dexamethasone can protect the testis from injury as well as the reproductive function of the testis after testicular torsion-detorsion and reduce the expression of ICAM1.</p>

One case of 2q37 deletion syndrome: clinical and genetic diagnosis / 中华儿科杂志

<p><b>OBJECTIVE</b>To diagnose a new born baby with 2q37 deletion syndrome by comprehensive use of cytogenetic and molecular techniques and to investigate the phenotype characteristics and applicability of array-comparative genomic hybridization (array-CGH) and multiplex ligation-dependent probe amplification (MLPA) for detection of this syndrome.</p><p><b>METHOD</b>Following conventional chromosome preparation, G banded karyotyping was performed.Genomic DNA was extracted using standard procedures, which were then analyzed by array-CGH and MLPA.</p><p><b>RESULT</b>The patient presented with a typical face, special fist posture and congenital heart disease in 2q37 deletion syndrome. A 4.709 Mb deletion at 2q37.3 (chr2:237, 967, 852-242, 677, 269.NCBI36/hg18, including genes from COL6A3 toPDCD1) was detected by array-CGH. The results of MLPA and G banded karyotyping confirmed the existence of this deletion.</p><p><b>CONCLUSION</b>2q37.3 deletion was determined to be the cryptic cause of this case.2q37 deletion syndrome has some clinically recognizable characteristics. And array-CGH is a powerful technique for the accurate diagnosis and genotype-phenotype correlation study of this syndrome.</p>

Contributions of medical practitioners of Xin'an area on acupuncture theory / 中国针灸

Contributions of Xin'an medical school and physicians to acupuncture theory were introduced in the article. Academic theories or characteristics of several physicians of Xin'an school such as YANG Xuan-cao, WU Kun, WANG Ji, WU Yi-ding, ZHENG Mei-jian and XU Chun-fu, et al were sorted out. Contributions of inheriting and illustrations on acupuncture theory were analyzed so as to expound its significance and value on modern acupucture clinic.

Study on the relative specificity of the heart and lung meridians in brain with fMRI / 中国针灸

<p><b>OBJECTIVE</b>To study the central modulation mechanism on the relative specificity of the Heart and Lung Meridians and to provide the experimental evidence for deeply study on correlation between meridian-viscera and brain.</p><p><b>METHODS</b>Ten healthy students in Anhui College of TCM were chosen and a modified block design was adopted. After 32 time points of resting and 32 of rotation needling, then 48 of resting and 32 stimulating, and 16 resting time points, functional imagings were collected at last. All the process would last for 10 min 44 sec. Acupuncture work was finished by one acupuncturist with extensive experience by acupuncture at the left Shenmen (HT 7) or Taiyuan (LU 8) with the disposable sterile stainless steel needle, and uniform reinforcing-reducing method was used with frequency of 1 Hz and depth of 1.0 cm. After the experiment, the sensation of acupuncture and the other feeling or psychic process were inquired and recorded detailedly. These data were analyzed by AFNI software.</p><p><b>RESULTS</b>Acupuncture at Taiyuan (LU 8) could excite the contralateral frontal lobe, apical lobe, cerebral ganglion, VI, VIII areas and inferior semilunar lobule of cerebellum, and restrain bilateral callosal gyrus and homolateral gyrus rectus. Acupuncture at Shenmen (HT 7) could excite the contralateral IV-VIII areas of cerebellum, and homolateral VI, VII areas of cerebellum, and restrain parts of homolateral apical lobe.</p><p><b>CONCLUSION</b>Acupuncture at Shenmen (HT 7) of the Heart Meridian and Taiyuan (LU 8) of the Lung Meridian can excite or restrain different brain areas, indicating that there are relatively specific corresponding brain areas for the Heart Meridian and Lung Meridian.</p>

Analysis of fetal chromosomal karyotype and etiology in 252 cases of early spontaneous abortion / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To investigate the relationship between fetal chromosomal karyotype and early spontaneous abortion, and the effect of the environmental factors on spontaneous abortion.</p><p><b>METHODS</b>Choronic villi from 252 cases of missed abortion were sampled as patient group and 50 normal pregnancies as control group. Chorionic villi were cultured and karyotype analysis was performed by G-banding. Clinical information was collected.</p><p><b>RESULTS</b>The rate of chorion chromosome abnormality in the patient group was 58.09%, significantly higher than that in the control group (4.17%) (P<0.01). Among the 140 cases of karyotype abnormalities, 81 were trisomy, 29 were monosomy X and 17 were polyploidy, accounting for 57.86%, 20.71% and 12.14% of total abnormalities, respectively. Long time and low dose radiation exposure of the pregnant female seemed to be related with spontaneous abortion(P<0.01).</p><p><b>CONCLUSION</b>Chorion chromosome abnormality is a major reason of early spontaneous abortion and karyotype analysis of chorionic villus is of clinical importance. For pregnant women, long-term exposure to computers and television seems a risk factor for missed abortion.</p>

Association study on single nucleotide polymorphisms in HTRA1 gene and rheumatoid arthritis / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To study the association between the single nucleotide polymorphisms (SNPs) in the high-temperature requirement A-1 (HTRA1) gene and rheumatoid arthritis (RA) in Chinese Han population.</p><p><b>METHODS</b>Five SNPs in the HTRA1 gene (rs2014307, rs2248799, rs2300433, rs714816 and rs2268356) were genotyped by ABI Snapshot method in Han Chinese cohort composed of 344 patients with RA and 288 healthy controls. The serum rheumatoid factor (RF) and C-reactive protein (CRP) of the patients were determined by endpoint nephelometry method.</p><p><b>RESULTS</b>Genotypes of all the five SNPs in the HTRA1 gene were not significantly different between the RA patients and controls (P> 0.05). Haplotypes generated by these five SNPs did not show significantly difference between the two groups either (P> 0.05). Serum RF levels in the RA patients had no significant difference among the genotypes for four SNPs (rs2014307, rs2248799, rs714816, and rs2268356) in the HTRA1 gene, while RF levels in the RA patients with genotypes AA+AG of the rs2300433 locus were significantly higher than that in genotype GG carriers (P< 0.05). Serum CRP levels in the RA patients had no significant difference among the genotypes for all the five SNPs.</p><p><b>CONCLUSION</b>Author's results suggested that although the five SNPs in the HTRA1 gene were not associated with RA in Chinese Han population, RF levels in the RA patients with genotypes AA and AG in the rs2300433 locus were significantly higher than the GG carriers. The HTRA1 role in RF regulation needs to be further investigated.</p>

Percutaneous locking plate combined with Sizhi-Xifang for treatment of the distal tibial fracture / 中国骨伤

<p><b>OBJECTIVE</b>To observe the clinical effect of Sizhi-Xifang in the improvement of postoperative ankle function.</p><p><b>METHODS</b>From Jan. 2006 to Mar. 2008,49 patients were divided randomly into treatment group and control group. The treatment group included 16 males and 8 females with an average age of (41.3 +/- 13.2) years, involving 13 cases of tye A, 9 of type B and 2 of type C based on AO classification. The control group included 15 males and 10 females with an average age of (38.2 +/- 10.9) years, involving 12 cases of type A, 10 of type B, 3 of type C. Minimal invasive percutaneous plate were used in each group. In treatment group 24 cases were treated with Sizhi-Xifang after the incisions were healed.</p><p><b>RESULTS</b>There were no incision infections, flaps necrosis, bone and plate exposure after treatment in two groups. All patients were followed-up for 4 to 16 months with an average of 8.6 months. According to Johner-Wruhs evaluation standard, there were 7 cases in excellent, 12 good, 5 in fair in treatment group and in control group there were 5 cases in excellent, 7 in good, 10 in fair and 3 in poor. The comparison of effect between two groups had significant difference (P < 0.05).</p><p><b>CONCLUSION</b>Sizhi-Xifang is helpful to improve the ankle postoperative function.</p>

Effect of IKVAV Peptide Nanofiber on Proliferation,Adhesion and Differentiation into Neurocytes of Bone Marrow Stromal Cells / 华中科技大学学报（医学）（英德文版）

This study examined the effect of IKVAV peptide nanofiber on proliferation,adhesion and differentiation into neurocytes of bone marrow stromal cells(BMSCs).IKVAV Peptide-amphiphile was synthesized and purified.Then,hydrogen chloride was added to the diluted aqueous solutions of PA to induce spontaneous formation of nanofiber in vitro.The resultant samples was observed under transmission electron microscope.BMSCs were cultured with IKVAV peptide nanofiber.The effect of IKVAV nanofiber on the proliferation,adhesion and induction differentiation of BMSCs was observed by inverted microscopy,calcein-AM/PI staining,cell counting and immunofluorescence staining.The results demonstrated that IKVAV peptide-amphiphile could self-assemble to form nanofiber gel.BMSCs cultured in combination with IKVAV peptide nanofiber gel grew well and the percentage of live cells was over 90%.IKVAV peptide nanofiber gel exerted no influence on the proliferation of BMSCs and could promote the adhesion of BMSCs and raise the ratio of neurons when BMSCs were induced to differentiate into neurocytes.It is concluded that BMSCs could proliferate and adhere well and yield more neurons during when induced to differente into neurocytes on IKVAV peptide nanofiber gel.

Repair of Rabbit Femoral Defects with a Novel BMP2-derived Oligopeptide P24 / 华中科技大学学报（医学）（英德文版）

In this study, the bioactivity of a novel BMP2-derived oligopeptide P24 was investigated by using the model of rabbit femoral defect after loaded in the biodegradable poly (lactic acid / glycolic acid / asparagic acid-co-polyethylene glycol) (PLGA-[ASP-PEG]). A 1.5-cm unilateral segmental bone defect was created in the left femoral diaphysis in each of the 30 new zealand white rabbits.The defects of 18 legs filled with BMP2-derived peptide P24 combined with PLGA-[ASP-PEG]scaffold serves as the experimental group, and the defects in the rest 12 rabbits filled with(PLGA-[ASP-PEG]) without P24 as control group. The bone-repairing capability in the target region of the two group was grossly, radiologically, histopathologically and biomechanically evaluated 4, 8and 12 weeks after the operation. Our results showed that in each group, primary healing of incision was achieved in the two groups. Radiographically, in experimental group, defects were filled with induced callus within 8 weeks, and a cortical bone-like structure was observed in some animals at the12th week. According to the standardized stage of bone defect repair, 9 (64.28%) achieved grade-4healing. In contrast, little bone formation was seen in the defects even 12 weeks after the operation,and 5 (62.50%) had grade 0 healing in this group. Histologically, tissue engineering material was mostly absorbed and cartilage was found around implants in the experimental group at the 4th week;8 weeks after operation, the engineering material was completely absorbed, and formation of woven bone was observed and typical trabecular bone structure could be seen. In control group, 8 weeks after operation, the defect was filled with fibrous tissues, and no bone-like structure was observed. Statistical analysis showed very significant difference in biomechanical indicators between the two groups (P＜0.05). It is concluded that new oligopeptide P24 can induce excellent bone regeneration and promote bone repair.

Procedural sedation and analgesia in the emergency medicine / 中国医学科学院学报

The relief of acute pain is a key link in modern emergency medicine. Procedural sedation and analgesia is a necessary technique for emergency physicians. This article summarizes its application in emergency therapy.

MLST typing of Streptococcus suis isolated from clinical patients in Guangdong Province in 2005 / 南方医科大学学报

Intensive surveillance of human S.suis infection was carried out in July and August of 2005 in Guangdong Province, which coincided with the Sichuan outbreak. Five isolated cases of human infections were identified during this period, from which 5 S. suis serotype 2 isolates were recovered. MLST analysis showed that these 5 isolates shared identical sequences of 6 MLST housekeeping genes except for one point mutation found within the thrA gene fragment, a neutral mutation (TTA to TTG) in the third nucleotide (360 nt) of the codon for leucine. MLST analysis identified 2 sequence types in the Guangdong sporadic infection. Three Guangdong isolates L-SS002, L-SS003 and L-SS005 belonged to ST7, while the other two isolates L-SS004 and L-SS006 belonged to ST1, but they all belonged to ST1 clonal complex. This finding represents a striking feature that differs from the Sichuan outbreak caused by a single ST7 SS2 clone. The 3 isolates of ST7 were probably imported from Sichuan Province, while the origin of the other 2 isolates of ST1 still remain to be clarified.