Milk fat globule membrane supplementation protects againstβ-lactoglobul-ininduced food allergy in mice via upregulation of regulatory T cells and enhancement of intestinal barrier in a microbiota-derived short-chain fatty acids manner

Milk fat globule membrane(MFGM),which contains abundant glycoproteins and phospholipids,exerts beneficial effects on intestinal health and immunomodulation.The aim of this study was to evaluate the protective effects and possible underlying mechanisms of MFGM on cow’s milk allergy(CMA)in aβ-lactoglobulin(BLG)-induced allergic mice model.MFGM was supplemented to allergic mice induced by BLG at a dose of 400 mg/kg body weight.Results demonstrated that MFGM alleviated food allergy symptoms,decreased serum levels of lipopolysaccharide,pro-inflammatory cytokines,immunoglobulin(Ig)E,Ig G1,and Th2 cytokines including interleukin(IL)-4,while increased serum levels of Th1 cytokines including interferon-γand regulatory T cells(Tregs)cytokines including IL-10 and transforming growth factor-β.MFGM modulated gut microbiota and enhanced intestinal barrier of BLG-allergic mice,as evidenced by decreased relative abundance of Desulfobacterota,Rikenellaceae,Lachnospiraceae,and Desulfovibrionaceae,while increased relative abundance of Bacteroidetes,Lactobacillaceae and Muribaculaceae,and enhanced expressions of tight junction proteins including Occludin,Claudin-1 and zonula occludens-1.Furthermore,MFGM increased fecal short-chain fatty acids(SCFAs)levels,which elevated G protein-coupled receptor(GPR)43 and GPR109A expressions.The increased expressions of GPR43 and GPR109A induced CD103+dendritic cells accumulation and promoted Tregs differentiation in mesenteric lymph node to a certain extent.In summary,MFGM alleviated CMA in a BLG-induced allergic mice model through enhancing intestinal barrier and promoting Tregs differentiation,which may be correlated with SCFAs-mediated activation of GPRs.These findings suggest that MFGM may be useful as a promising functional ingredient against CMA.

SHA.LIN及S.T.O.N.E.评分系统预测输尿管软镜钬激光碎石术结石清除率的临床价值

目的 分析SHA.LIN及S.T.O.N.E.评分系统对输尿管软镜钬激光碎石术(FURS)结石清除率的评估价值,为临床提高结石清除率提供新思路。方法 回顾性分析张家港市第五人民医院2018年4月至2022年12月期间入院诊治的94例肾结石患者的临床资料,并根据术后是否有结石残留将其分为清除组(58例)和残留组(36例)。比较两组患者SHA.LIN及S.T.O.N.E.评分;对两组患者的一般资料进行单因素分析,并通过多因素Logistic回归模型分析,筛选影响FURS结石清除率的独立危险因素;并采用受试者工作特征(ROC)曲线分析SHA.LIN及S.T.O.N.E.评分对FURS结石清除率的预测效能。结果 残留组患者SHA.LIN及S.T.O.N.E.评分均显著高于清除组;残留组患者出血量、受累肾盏个数均显著多于清除组,最大累计截面积显著大于清除组(均P<0.05);多因素Logistic回归模型分析结果显示,SHA.LIN及S.T.O.N.E.评分高、出血量多、受累肾盏个数多均是影响FURS结石清除率的独立危险因素;经ROC曲线分析结果显示,SHA.LIN及S.T.O.N.E.评分预测FURS结石清除率的曲线下面积(AUC)分别为0.913、0.718,灵敏度分别为77.60%、65.50%,特异度分别为94.40%、75.00%,SHA.LIN评分预测的AUC、灵敏度、特异度均高于S.T.O.N.E.评分(均P <0.05)。结论 SHA.LIN及S.T.O.N.E.评分高,出血量多、受累肾盏个数多均是影响FURS结石清除率的危险因素,其中SHA.LIN及S.T.O.N.E.评分系统均能够预测FURS结石清除率情况,且SHA.LIN评分系统的预测价值高于S.T.O.N.E.评分系统。

Streptomyces sp.Tü 4128中新型抗生素bagremycins抗性基因bagJ的研究

通过框内敲除鉴定了链霉菌Streptomyces sp.Tü4128中基因bagJ的功能。HPLC结果表明,敲除基因bagJ导致抗生素生产水平大幅降低;回补菌株恢复了抗生素的生产;过表达菌株大幅提高了抗生素的产量,证明基因bagJ在新型抗生素bagremycins的生物合成中必不可少。抑菌圈实验表明基因bagJ敲除菌株较野生菌株对bagremycins更加敏感;BagJ在Streptomyces lividans TK64中异源表达后使该菌株对bagremycins的耐受性增强,证明bagJ是新型抗生素bagremycins的抗性基因。扫描电镜的结果证明了BagJ异源表达后导致Streptomyces TK64的菌丝形态发生了改变。其他抗生素的敏感性实验表明,BagJ可能是一个逆向转运蛋白。

Association between apolipoprotein E promoter-219G/T polymorphism and total cholesterol level in patients with Alzheimer disease

BACKGROUND: Many researches have suggested that apolipoprotein E (APOE) and total cholesterol metabolism are closely related with dementia. In the supposed theory, 219 site of APOE promoter region is near gene coding region, so its polymorphism may result in the abnormality of APOE gene and protein expression, and finally lead to dementia. OBJECTIVE: To observe the association between APOE promoter-219G/T polymorphisms with serum total cholesterol in patients with Alzheimer disease, and compare it with non-dementia people. DESIGN: Case-control, comparative observation. SETTING: Department of Neurology, Fengtian Hospital of Shenyang Medical College. PARTICIPANTS: Fifty-five dementia patients including 27 males and 28 females aged (66±3) years and treated in the Department of Neurology, Fengtian Hospital were selected from January 2002 to December 2005 as the Alzheimer disease group. They all diagnosed according to the DSM-Ⅳdiagnostic criteria of Alzheimer disease instituted by American Psychiatry Association in 1994. Meanwhile, 44 none-dementia patients including 21 males and 23 females aged (66±3) years were selected from other clinical departments of Fengtian Hospital as control group. All the participants were informed the detection and agreed. METHODS: Genomic DNA was extracted from the peripheral blood of all subjects, then 'NEST'PCR, DNA sequence and enzyme digestion were adopted to detect the expression of APOE promoter-219 polymorphism, following by biomedical statistics analysis based on the clinical total cholesterol level. MAIN OUTCOME MEASURES: Polymorphism of APOE promoter-219 G/T and total cholesterol level. RESULTS: All 55 dementia patients and 44 non-dementia ones were involved in the result analysis. ①Allele and genotype frequency: The T allele frequency of the Alzheimer disease group was significantly higher than that in the control group [88.2% (97/110), 54.5% (48/88)], while G allele frequency was remarkably lower than that in the control group [11.8%(13/110), 45.5%(40/88), χ2=8.2, P < 0.01]. The TT allele frequency of the Alzheimer disease group was significantly higher than that in the control group [76% (42/55), 48% (21/44)], while GT+GG allele frequency was remarkably lower than that in the control group [24%(13/55), 52%(23/44), χ2=8.7, P < 0.01]. ②Total cholesterol level: The level of the TT genotype patients in the Alzheimer group was obviously higher than that in GT+GG genotype patients (t =2.46, P < 0.05); the cholesterol level in the two genotypes of the control group was similar (P > 0.05). CONCLUSION: TT genotype and allele T in the APOE promoter-219 polymorphisms are the sensitive gene, and genotype TT has a relationship with the increase of total cholesterol level.

Practical approach in hepatitis b e antigen-negative individuals to identify treatment candidates

The natural history of chronic hepatitis B is characterized by different phases of infection,and patients may evolve from one phase to another or may revert to a previous phase.The hepatitis B e antigen(HBeAg)-negative form is the predominant infection worldwide,which consists of individuals with a range of viral replication and liver disease severity.Although alanine transaminase(ALT)remains the most accessible test available to clinicians for monitoring the liver disease status,further evaluations are required for some patients to assess if treatment is warranted.Guidance from practice guidelines together with thorough investigations and classifications of patients ensure recognition of who needs which level of care.This article aims to assist physicians in the assessment of HBeAgnegative individuals using liver biopsy or non-invasive tools such as hepatitis B s antigen quantification and transient elastography in addition to ALT and hepatitis B virus DNA,to identify who will remain stable,who will reactivate or at risk of disease progression hence will benefit from timely initiation of anti-viral therapy.

肾结石S.T.O.N.E.评分与Guy's分级预测经皮肾镜取石术后结石残留的比较

目的对比肾结石S.T.O.N.E.评分与Guy's分级预测经皮肾镜取石术后结石残留的准确性。方法回顾性分析收治的156例因肾结石行经皮肾镜取石术患者的临床资料并根据患者术前CT进行S.T.O.N.E.评分与Guy's分级,分析S.T.O.N.E.评分与Guy's分级与结石残留、手术时间、估计失血量等临床数据的关系并比较S.T.O.N.E.评分与Guy's分级预测经皮肾镜取石术后结石残留的准确性。结果 156例患者结石残留共70例(44.9%),结石残留患者与无残留患者S.T.O.N.E.评分分别为8.81±1.30和7.49±1.46(P=0.000),Guy's分级分别为3.23±0.78和2.31±0.84(P=0.000)。线性回归模型检验S.T.O.N.E.评分与Guy's分级与估计失血量(P=0.009,0.000)、手术时间(均P=0.000)均明显相关。logistic回归分析S.T.O.N.E.评分和Guy's分级均与经皮肾镜取石术后结石残留状态明显相关(OR=1.94,P=0.000;OR=3.63,P=0.000),ROC分析两者预测术后结石残留准确性无明显区别,AUC分别为0.750和0.773(P=0.608)。结论肾结石S.T.O.N.E.评分与Guy's分级法均可有效预测经皮肾镜取石术后结石残留状态,两者预测的准确性无明显区别。

Hepatitis B surface antigen and hepatitis B core-related antigen kinetics after adding pegylated-interferon to nucleos(t)ids analogues in hepatitis B e antigen-negative patients

BACKGROUND Hepatitis B e antigen-negative chronic hepatitis B patients under nucleos(t)ids analogues(NAs)rarely achieve hepatitis B surface antigen(HBsAg)loss.AIM To evaluate if the addition of pegylated interferon(Peg-IFN)could decrease HBsAg and hepatitis B core-related antigen(HBcrAg)levels and increase HBsAg loss rate in patients under NAs therapy.METHODS Prospective,non-randomized,open-label trial evaluating the combination of Peg-IFN 180μg/week plus NAs during forty-eight weeks vs NAs in monotherapy.Hepatitis B e antigen-negative non-cirrhotic chronic hepatitis B patients of a tertiary hospital,under NAs therapy for at least 2 years and with undetectable viral load,were eligible.Patients with hepatitis C virus,hepatitis D virus or human immunodeficiency virus co-infection and liver transplanted patients were excluded.HBsAg and HBcrAg levels(log10 U/mL)were measured at baseline and during ninety-six weeks.HBsAg loss rate was evaluated in both groups.Adverse events were recorded in both groups.The kinetic of HBsAg for each treatment group was evaluated from baseline to weeks 24 and 48 by the slope of the HBsAg decline(log10 IU/mL/week)using a linear regression model.RESULTS Sixty-five patients were enrolled,61%receiving tenofovir and 33%entecavir.Thirty-six(55%)were included in Peg-IFN-NA group and 29(44%)in NA group.After matching by age and treatment duration,baseline HBsAg levels were comparable between groups(3.1 vs 3.2)(P=0.25).HBsAg levels at weeks 24,48 and 96 declined in Peg-IFN-NA group(-0.26,-0.40 and-0.44)and remained stable in NA group(-0.10,-0.10 and-0.10)(P<0.05).The slope of HBsAg decline in Peg-IFN-NA group(-0.02)was higher than in NA group(-0.00)(P=0.015).HBcrAg levels did not change.Eight(22%)patients discontinued Peg-IFN due to adverse events.The HBsAg loss was achieved in 3(8.3%)patients of the Peg-IFN-NA group and 0(0%)of the NA group.CONCLUSION The addition of Peg-IFN to NAs caused a greater and faster decrease of HBsAg levels compared to NA therapy.Side effects of Peg-IFN can limit its use in clinical practice.

eNOS G894T基因多态性与胃癌发生发展关系的研究

目的:探讨内皮型一氧化氮合酶(Endothelial NOS,eNOS)基因多态性与胃癌发生发展的关系。方法:采用PCR-RFLP技术,检测福建地区汉族324例胃癌患者(病例组)和200例健康对照者(对照组)eNOS基因G894T多态性。结果:(1)在病例组和对照组中e,NOS G894T SNP基因型频率G/G分别为76.5%(248/324)和73.0%(146/200),G/T+T/T分别为23.5%(76/324)和27.0%(54/200),等位基因频率G分别为88.0%(570/648)和86.3%(345/400),T分别为12.0%(78/648)和13.7%(55/400)。eNOS G894T SNP基因型和等位基因频率在病例组与对照组的分布差异无统计学意义(均P>0.05);弥漫型胃癌和肠型胃癌分别与对照组比较,任一基因型或等位基因亦未增加患癌风险(均P>0.05)。(2)eNOS G894T基因型频率分布与胃癌的临床病理特征无明显关系(均P>0.05)。结论:福建地区汉族人群eNOS基因G894T多态性与胃癌的发生和发展无关。

盐度对芦苇(Phragmites australis)表流湿地除氮效果的影响

利用芦苇湿地去除农业污水中的氮是博斯腾湖流域控制富营养化的重要手段.但是,污水中的盐分往往会抑制芦苇(Phragmites australis)湿地的除氮效果.为了探索不同盐度对芦苇湿地脱氮效果的影响和机制,研究4个不同的盐度梯度(淡水、2‰、5‰和10‰)对芦苇表流湿地中氮去除的影响,测定不同盐度下湿地表层(0~10.0 cm)和下层土壤(10.0~20.0 cm)中硝化、反硝化作用强度的变化.结果表明,盐度上升显著降低了湿地氮的去除率,但是不同离子形态的氮变化趋势并不一致.5‰和10‰盐度下的芦苇湿地中总氮、铵态氮去除率分别下降了9.03%、31.80%和23.10%、39.20%,亚硝态氮累积率分别上升了190%、690%,而硝态氮并未发生明显变化.相对于参与反硝化作用的菌群,盐度对参与硝化作用菌群的抑制作用更强是产生此现象的主要原因.除此之外,盐度升高导致植物根系泌氧减少也是土壤中的硝化作用强度降低的重要原因之一.

肾结石S.T.O.N.E.评分与Guy’s分级对经皮肾镜碎石术后结石残留预测价值的比较

目的评价肾结石S.T.O.N.E.评分与Guy’s分级对经皮肾镜碎石术(percutaneous nephroscopic lithotripsy,PCNL)后结石残留的预测效能。方法选择2014年1月—2019年12月于蚌埠市第三人民医院泌尿外科行PCNL的肾结石患者114例,男72例、女42例;其中结石已清除(清除组)的患者77例,术后有结石残留(残留组)的患者37例。比较两组患者的临床特征、S.T.O.N.E.评分与Guy’s分级。采用多因素logisitic回归分析PCNL后结石残留的预测指标,绘制ROC曲线评价筛选所得指标的诊断效能,计算并比较不同指标的AUC。结果残留组的结石负荷显著大于清除组(P<0.01),肾皮质厚度显著小于清除组(P<0.05),手术时间显著长于清除组(P<0.01),术中出血量显著多于清除组(P<0.05)。残留组S.T.O.N.E.总评分为(8.65±1.32)分,显著高于清除组的(7.31±0.95)分(P<0.01)。残留组S.T.O.N.E.评分中结石最大横截面积2、3、4分,肾结石占肾盏数量2、3分患者所占比例均显著高于清除组(P值均<0.01);两组间穿刺通道长度、肾积水、结石密度各评分患者所占比例的差异均无统计学意义(P值均>0.05)。残留组Guy’s分级GⅢ、GⅣ级患者所占比例均显著高于清除组(P值均<0.01)。多因素logistic回归分析结果显示,S(结石最大横截面积)评分、N(受累肾盏数)评分、Guy’s分级、穿刺肾皮质厚度为PCNL后结石残留的独立预测指标。ROC曲线评价结果显示,S.T.O.N.E.总评分预测PCNL后结石残留的AUC为0.837(95%CI为0.756~0.900,P<0.05),Guy’s分级预测PCNL后结石残留的AUC为0.745(95%CI为0.655~0.822,P<0.05),S.T.O.N.E.总评分ROC曲线AUC显著高于Guy’s分级(Z=2.082,P=0.037)。S.T.O.N.E.总评分与Guy’s分级联合指标预测PCNL后结石残留的ROC曲线AUC为0.858(95%CI为0.780~0.916,P<0.05),有高于Guy’s分级的趋势,但差异无统计学意义(P>0.05)。结论S.T.O.N.E.评分与Guy’s分级对PCNL后结石残留均具有明确的预测价值,S.T.O.N.E.评分的预测效能更高。

HPV16 E6 gene mutation promotes the proliferation of cervical cancer cells by regulating the expression of BDNF/TrKB

Objective:Study on the mechanism of HPV16 E6 gene mutation promoting the proliferation of cervical cancer cells by influencing the expression of BDNF/TrkB.Methods:The expression levels of HPV16 E6 T350G,BDNF,TrkB and p53 mRNA in cervical cancer tissue samples and CINII cervical tissues were detected by Real-time PCR.HPV16 E6 T350G lentivirus(pLV5-HPV16 E6 T350G)and empty vector(pLV5-vector)were designed and constructed,and transfected with HCerEpiC cells,the expression levels of HPV16 E6 T350G,BDNF,TrKB and p53 mRNA were detected by Real-time PCR,and the expression levels of BDNF,TrKB,PI3K,pPI3K,AKT and pAKT protein were detected by western blot;cell proliferation was detected by MTT experiments.Results:Compared with cinii cervical tissue,HPV16 E6 T350G,BDNF and TrkB mRNA expression levels were all positive,while p53 mRNA expression was negative.After overexpression of HPV16 E6 T350G in HCerEpiC cells,it can up-regulate the expression levels of BDNF and TrKB protein and mRNA,and activate the PI3K/AKT signaling pathway which is the downstream of BDNF/TrKB,and reduce p53 protein expression levels;HPV16 E6 T350G overexpression can enhance the proliferation capacity of HCerEpiC cells.Conclusion:Overexpression of HPV16 E6 T350G can promote the proliferation of cervical cancer cells,which may be related to the upregulation of BDNF/TrKB expression,the activation of PI3K/AKT signaling pathway,and the decrease of p53 expression.

S.T.O.N.E.肾结石评分系统和CT值在肾结石手术治疗效果的预测价值对比

目的:探讨S.T.O.N.E.肾结石评分系统和CT值在肾结石手术治疗效果的预测价值。方法:选取医院泌尿外科收治的82例行肾结石手术治疗患者,根据手术治疗效果分为结石清除组(60例)和结石残留组(22例)。所有患者均在术前行S.T.O.N.E.肾结石评分和CT检查,根据S.T.O.N.E.肾结石评分系统对患者的结石状况进行评分,依据CT值预测结石清除的危险因素,采用受试者工作特征(ROC)曲线分析诊断效能,观察治疗后结石清除率、手术时间、住院时间以及术中出血量,分析影响结石清除的相关因素。结果:82例肾结石患者的平均术前S.T.O.N.E.肾结石评分为(7.52±1.26)分,CT值(1052.32±215.32)HU;在经皮肾镜术治疗后,结石清除率为73.17%,结石残留率为26.83%,其中手术时间为(101.25±15.32)min,住院时间为(9.23±1.25)d,术中出血量为(25.32±4.12)ml。ROC分析显示,S.T.O.N.E.肾结石评分和CT值预测结石清除的曲线下面积(AUC)分别为0.985和0.996,灵敏度分别为95.00%和98.30%,特异度分别为95.50%和100.00%。单因素分析显示,结石残留组与结石清除组在年龄、性别及结石位置比较中差异无统计学意义;而在CT值、结石长径、结石数目、结石所占肾盏数、肾积水程度以及S.T.O.N.E.肾结石评分比较中,差异具有统计学意义(χ^(2)=6.721,χ^(2)=8.183,χ^(2)=5.794,χ^(2)=8.966,χ^(2)=11.515,χ^(2)=11.437;P<0.05)。二元Logistic回归分析显示,高密度CT值、结石长径>40 mm、结石数目、结石所占肾盏数≥3个、重度和(或)中度肾积水以及S.T.O.N.E.肾结石评分均为影响肾结石手术患者结石清除的危险因素(OR=6.400,OR=4.978,OR=3.370,OR=4.950,OR=5.000,OR=7.619,OR=65.609;P<0.05)。结论:S.T.O.N.E.肾结石评分系统与CT值对肾结石手术治疗效果均有预测价值,但CT值的预测价值更高,而高密度CT值、S.T.O.N.E.肾结石评分等均为影响肾结石手术患者结石清除的危险因素。

Robust Non-Fragile Guaranteed Cost Control for Nonlinear Time Delay Discrete-Time Systems Based on T-S Model

This paper concerns the robust non-fragile guaranteed cost control for nonlinear time delay discrete-time systems based on Takagi-Sugeno （T-S） model. The problem is to design a guaranteed cost state feedback controller which can tolerate uncertainties from both models and gain variation. Sufficient conditions for the existence of such controller are given based on the linear matrix inequality （LMI） approach combined with Lyapunov method and inequality technique. A numerical example is given to illustrate the feasibility and effectiveness of our result.

S.T.O.N.E.评分与Guy分级预测经皮肾镜取石术结石清除率准确性的比较

目的比较S. T. O. N. E.肾结石评分与Guy肾结石分级对经皮肾镜取石术(percutaneous nephroscope lithoipsy,PCNL)结石清除率预测的准确性。方法选择2015-01至2017-12在西安交通大学第二附属医院接受PCNL的患者146例,术前分别进行S. T. O. N. E.评分和Guy分级。术后统计结石清除率,分别计算S. T. O. N. E.评分和Guy分级的ROC曲线下面积,对比两种方法预测的准确性。结果结石清除率为73. 97%。S. T. O. N. E.肾结石评分预测PCNL术后结石清除率的准确性为74. 8%,最佳阈值为8. 5分,灵敏度为73. 7%,特异度为71. 3%; Guy分级预测PCNL术后结石清除率的准确性为71. 5%,最佳阈值为2. 5级,灵敏度为71. 1%,特异度为64. 8%。两种方法的ROC曲线下面积分别为0. 748和0. 715,无统计学差异。结论 S. T. O. N. E.评分与Guy分级均具有中等水平预测能力,均可用来评估PCNL术后结石清除率,两个方法的预测能力未见统计学差别。

S.T.O.N.E.评分与Guy’s评分预测经皮肾镜取石术结石清除率对比分析

目的:对比和评价S.T.O.N.E.评分系统和Guy’s评分系统预测经皮肾镜取石术(PCNL)患者术后结石清除率。方法:回顾性分析362例接受PCNL患者的临床资料。对同一患者的临床资料分别计算S.T.O.N.E.评分和Guy’s评分。结果:一期结石清除率为72%,58(17%)位患者发生术后并发症。结石清除组与结石残留组的Guy’s评分平均分别为2.3分和2.9分(P<0.001),S.T.O.N.E.评分平均分别为8.2分和9.8分(P<0.001)。S.T.O.N.E.评分系统和Guy’s评分系统都能预测结石清除率,但S.T.O.N.E.评分系统(S_(ROC)=0.710)优于Guy’s评分系统(S_(ROC)=0.674)。结论:S.T.O.N.E.评分系统和Guy’s评分系统相比能够好地预测PCNL患者的结石清除率。

^(64)Cu-DOTA-SPIONs-PEG-FA:靶向叶酸受体阳性肿瘤的PET/MRI双模态显像探针

报道了一种可用于叶酸受体阳性肿瘤显像的PET/MRI双模态显像探针(^(64)Cu-DOTA-SPIONs-PEGFA)的合成、初步的生物学评价及PET/CT和MRI显像结果。该探针由包覆了生物相容性的聚乙二醇(poly ethylene glycol,PEG)、超顺磁氧化铁纳米粒子(superparamegnetic iron oxide nanoparticles,SPIONs)、叶酸(folic acid,FA)、1,4,7,10-四乙酸-1,4,7,10-四氮杂环十二烷(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid,DOTA)和正电子放射性核素^(64)Cu组成。经纯化后,^(64)Cu-DOTA-SPIONs-PEG-FA放化纯大于98%。荷KB裸鼠体内分布显示:^(64)Cu-DOTA-SPIONs-PEG-FA在肝脏、脾脏和肺中的放射性摄取较高,与非靶向标记物^(64)Cu-DOTA-SPIONs-PEG-OH比较,其对KB细胞瘤有明显的靶向作用。在MRI和PET/CT模式下,KB肿瘤能被较清晰地显像。^(64)Cu-DOTA-SPIONs-PEG-FA作为KB细胞肿瘤的PET/MRI双模态显像剂,有待于进一步深入研究以改善其标记率、稳定性和比活度等。

S.T.O.N.E.评分、Guy's分级、CROES图表计数预测经皮肾镜取石术后结石清除效果的比较

目的比较S.T.O.N.E.评分、Guy’s分级、CROES图表计数3种评分系统预测经皮肾镜碎石取石术后结石清除率的准确性。方法因肾结石行经皮肾镜碎石取石术病人133例,比较S.T.O.N.E.评分、Guy’s分级、CROES图表计数预测术后结石残留的准确性及与手术时间、术后住院时间、术中出血量等临床资料的关系。结果 133例病人术后结石残留有53例。Guy’s、S.T.O.N.E.评分系统随评分的增加,结石清除率逐渐降低;而CROES分级评分则相反。CROES图表计数评分方案对结石残留预测的准确性优于S.T.O.N.E.评分和Guy’s分级方案。结论与S.T.O.N.E.评分和Guy’s分级比较,CROES图表计数对经皮肾镜取石术后结石残留的预测准确性更高。

S-E-T悬吊训练对田径运动员平衡能力的影响

探讨S-E-T悬吊训练对田径运动员平衡能力的影响,通过实验法,以30名田径运动员为研究对象,进行为期12周的悬吊训练,测定比较训练前后平衡能力的变化情况,探讨S-E-T悬吊训练对田径运动员平衡能力的影响。经12周训练后,实验组的动态平衡能力和静态平衡能力显著提高,表明S-E-T悬吊训练可作为运动员改善平衡能力的有效锻炼方法之一在训练领域中进一步推广实施。

TSG-6调控PI3K/Akt-Bcl-2通路影响人瘢痕疙瘩凋亡机制的研究

目的研究瘢痕疙瘩形成中肿瘤坏死因子α刺激基因6(TSG-6)调控3-磷酸肌醇激酶/丝/苏氨酸蛋白激酶-B淋巴细胞瘤-2基因(PI3K/Akt-Bcl-2)信号通路对成纤维细胞表达和凋亡的关联性。方法构建p LVX-puro-TSG-6、p LVX-shRNA1-TSG-6及其对应空质粒重组慢病毒载体转入人瘢痕疙瘩成纤维(HKF)细胞,建立稳定转染的过表达细胞株、干扰细胞株、过表达对照细胞株、干扰对照细胞株,用流式细胞术和CCK-8法分别检测相应细胞株与HKF细胞凋亡与增殖。应用RT-PCR及Western blot分别检测TSG-6过表达细胞株、TSG-6干扰组细胞株及前两组对应对照组细胞株、HKF细胞株中PI3K、Akt、鼠双微基因2(MDM2)、P53基因、Bcl-2的信使核糖核酸及蛋白表达变化。结果与HKF组对比,TSG-6过表达组细胞增殖减缓,凋亡显著增加(t=-4.443,P=0.011);TSG-6干扰组则相反(t=3.827,P=0.019);其余各组间差异无统计学意义。RT-PCR、Western blot检测结果显示TSG-6过表达组抑制PI3K、Akt、MDM2、Bcl-2的mRNA及蛋白表达,促进P53的mRNA及蛋白表达(P<0.05)。TSG-6干扰组促进PI3K、Akt、MDM2、Bcl-2的mRNA及蛋白表达,抑制P53的mRNA及蛋白表达(P<0.05)。结论 TSG-6负向调控PI3K/Akt-Bcl-2通路促进HKF细胞凋亡,抑制瘢痕疙瘩增生。

TerraSAR-X几何校正及辐射定标模型

Terra SAR-X图像的几何校正和辐射定标对于获取地面目标高精度地理位置信息和辐射特征具有重要意义。采用距离-多普勒间接定位模型和仿射校正模型进行SAR影像几何校正,同时完成地形辐射校正并对辐射定标精度进行验证。距离向和方位向上达到了约0.3 m和0.4 m的几何定位精度;相对辐射定标精度优于0.3 d B,绝对辐射定标精度为0.22 d B,所以该模型能达到方法较高的精度且简单快捷。