桃浆中微量元素的湿法消解法和碳化酸溶法比较研究

目的:测定桃浆中微量元素的含量。方法:采用火焰原子吸收光谱法测定不同前处理方法(湿法消解法和碳化酸溶法),及不同比例HNO3+HClO4混合酸消解的桃浆中Fe、Mn、Cu的含量。结果:用不同的前处理方法得出的含量不一致,桃浆中3种金属离子含量的顺序为:Fe>Mn>Cu,且回收率在92.6%~119.6%间,RSD<2.86%。结论:该方法准确度高,稳定性好,结果准确可靠,同时证明桃浆中含有丰富的Fe、Cu、Mn,为进一步研究桃浆药理作用提供参考依据。     

Sinus floor elevation via hydraulic detachment and elevation of the Schneiderian membrane

OBJECTIVES: Minor sinus floor elevation is a method with relatively high predictability but is technically demanding. Improvement of the technique and increase in the predictability are desirable. MATERIAL AND METHODS: A clinical protocol for minor sinus floor elevation with SLA-ITI (large grit acid-etched implants with diameter of 4.8 mm) is described. Using trephine instead of spiral burrs enables the harvesting of autogenous grafts from the implant socket and guarantees a perfect implant socket. The latter is necessary for optimal implant anchoring and for the hydraulic seal between socket and the osteotome. The whole allows a hydraulic detachment of the Schneiderian membrane, where the blood cushion gradually detaches and elevates the membrane, preventing its contact with the graft. RESULTS: Eight patients were successfully treated with the method described above. No membrane perforation occurred and an uneventful healing was observed in all patients. All implants were loaded prosthodontically 3 months after the implantation. CONCLUSIONS: The clinical protocol presented provides high predictability in clinical outcome, together with extremely low morbidity and shortened surgery.     

桃红四物汤对慢性盆腔炎患者炎性应激及局部微循环状态的影响

目的:观察桃红四物汤对慢性盆腔炎患者炎性应激及局部微循环状态的影响。方法:将2014年5月—2015年2月本院收治的56例慢性盆腔炎患者随机分为对照组和观察组,每组各28例。对照组给予常规西医治疗,观察组给予桃红四物汤治疗。检测两组患者治疗前后细胞因子和血清炎性应激指标水平变化情况。结果:对照组治疗后2周及治疗后4周细胞因子指标和血清炎性应激指标改善情况均优于治疗前,观察组治疗后各期细胞因子和血清炎性应激指标改善情况均优于治疗前,差异均有统计学意义(P0.05);观察组治疗后各指标均优于对照组,差异具有统计学意义(P0.05)。治疗后观察组局部微循环指标优于对照组,差异具有统计学意义(P0.05)。结论:桃红四物汤可显著改善慢性盆腔炎患者炎性应激水平及局部微循环状态。     

不同产地脱脂乳木果仁总酚含量测定及其生物活性

测定了26个不同产地脱脂乳木果仁甲醇提取物的总酚含量(TPC)、抗氧化、细胞毒、EB病毒早期抗原(EBV-EA)抑制等活性,并评价了TPC与各生物活性间的相关性。采用紫外分光光度法测定TPC;采用1,1-二苯基-2-苦基肼(DPPH)自由基清除法、2,2′-连氮基-双(3-乙基苯并噻唑啉-6-磺酸)二铵盐(ABTS)自由基清除法和铁离子还原法(FRAP)3种方法评价提取物抗氧化活性;3-(4,5-二甲基噻唑-2)-2,5-二苯基四氮唑溴盐(MTT)法评价提取物对人白血病细胞HL60,肺癌细胞A549和乳腺癌细胞SK-BR-3的细胞毒性;间接免疫酶法评价提取物对EBV-EA抑制活性。结果表明:不同产地乳木果仁总酚含量相差较大(25.8~265.7 mg/g,以没食子酸计);部分产地提取物或有较好的抗氧化活性［DPPH:IC₅₀ 3.4~54.9 μg/mL,ABTS:1.11~4.09 mmol/g(以Trolox计),FRAP:1.24~1.93 mmol/g(以Trolox计)］、较强的细胞毒性(对不同细胞)(IC₅₀ 25.1~95.5 μg/mL)和EBV-EA抑制活性(100 μg/mL:85.8%~94.9%),其中TPC只与抗氧化活性有显著的相关关系(r=0.750~0.837,P<0.01)。     

KPCA和Adaboost算法在阿尔茨海默症功能磁共振影像分类中的 应用

本研究的目的在于使用机器学习方法,对脑部功能磁共振成像数据进行分析与特征提取,完成对阿尔茨海默症 （AD）的辅助诊断与分析。首先对数据进行预处理与去除协变量,并从大脑全局特征出发,根据现有的自动解剖标记模 板,把每个被试的大脑分为116个脑区,通过提取每个脑区的时间序列,构建全脑功能连接矩阵,然后使用核主成分分析 法进行特征提取,最后用Adaboost算法进行分类。在对34名AD患者、35名轻度认知障碍患者和35名正常对照组的功能 磁共振成像数据进行的实验结果表明,利用静息态功能磁共振成像,同时结合机器学习的方法,能够有效地实现AD的正 确分类,准确率可以达到96%,该结果可以为AD患者的临床辅助诊断提供有效的判断依据。     

Exact orthogonal kernel estimation from finite data records: Extending Weiner's identification of nonlinear systems

A technique is described for exact estimation of kernels in functional expansions for nonlinear systems. The technique operates by orthogonalizing over the data record and in so doing permits a wide variety of input excitation. In particular, the excitation is not limited to inputs that are white, Gaussian, or lengthy. Diagonal kernel values can be estimated, without modification, as accurately as off-diagonal values. Simulations are provided to demonstrate that the technique is more accurate than the Lee-Schetzen method with a white Gaussian input of limited duration, retaining its superiority when the system output is corrupted by noise.     

祛瘀化痰法合酮替芬治疗小儿咳嗽变异性哮喘35例

[目的]观察祛瘀化痰法合酮替芬治疗小儿咳嗽变异性哮喘的临床疗效。[方法]将95例咳嗽变异性哮喘患儿随机分为两组。治疗组35例予祛瘀化痰法联合酮替芬治疗;对照组32例予特布他林口服治疗,两组治疗时间均为14d。[结果]治疗组与对照组总有效率分别为94.3%和78.1%,差异有统计学意义(P<0.05)。[结论]祛瘀化痰法联合酮替芬治疗小儿咳嗽变异性哮喘有较好疗效。     

Nonparametric analysis of dependently interval‐censored failure time data

Failure time studies based on observational cohorts often have to deal with irregular intermittent observation of individuals, which produces interval‐censored failure times. When the observation times depend on factors related to a person's failure time, the failure times may be dependently interval censored. Inverse‐intensity‐of‐visit weighting methods have been developed for irregularly observed longitudinal or repeated measures data and recently extended to parametric failure time analysis. This article develops nonparametric estimation of failure time distributions using weighted generalized estimating equations and monotone smoothing techniques. Simulations are conducted for examination of the finite sample performance of proposed estimators. This research is motivated in part by the Toronto Psoriatic Arthritis Cohort Study, and the proposed methodology is applied to this study.     

无腺体棉籽仁的营养价值—棉籽仁营养成分、棉酚含量、氨基酸利用率

<正> 无腺体棉籽仁蛋白质含量丰富,不含色素腺体,不含或含有很少量的棉酚,因此提油后的饼粕或棉籽仁粉很可能成为动物饲料和人类食品中一种有营养价值的蛋白质来源。从七十年代起,我国棉花育种工作者开始了自己的无腺体棉育种工作并已育出适合我国自然条件的无腺体棉品种,有些品种已开始示范、推广种植。为了使无腺体棉籽及其产品在饲料和食品工业中得到充分利用,促进无腺体棉花品种的培育和推广,我们对本国培育的主要无腺体棉品种的籽仁营养价值进行了初步研究。     

复方桃仁软肝胶囊治疗慢性乙型肝炎肝纤维化患者的临床观察

目的：观察复方桃仁软肝胶囊治疗慢性乙型肝炎肝纤维化的临床疗效。方法：将62例慢性乙型肝炎肝纤维化患者随机分为两组，治疗组（32例）口服复方桃仁软肝胶囊，对照组（30例）口服普通保肝药，疗程均为6个月。观察用药前后血清肝纤维化指标、门静脉血流动力学以及肝组织病理等方面的变化。结果：治疗组治疗后血清肝纤维化各项指标和门静脉主干血流动力学各参数均有明显改善（P＜0.05或P＜0.01)，与对照组比较，差异有显著性（P＜0.05或P＜0.01）。有15例（治疗组11例、对照组4例）在治疗前行肝活检，治疗组中有2例治疗后行第2次肝活检，对该2例治疗前后两次肝活检组织进行光镜和电镜检查，显示肝细胞变性坏死减轻，肝纤维化程度明显下降，同时α－平滑肌肌动蛋白（α－SMA）免疫组织化学染色也显示治疗后α-SMA阳性的肝星状细胞（HSC）数明显减少。结论：初步认为复方桃仁软肝胶囊对慢性乙型肝炎肝纤维化具有一定的抗肝纤维化作用。