Evaluation of Interferon-Gamma Release Assay Testing and Tuberculin Skin Test for Early Diagnosis of Tuberculosis in Children and Adolescents

Background: This study aimed to evaluate the diagnostic value of interferon-γ release assay (IGRA), a sensitive microbiological diagnostic method, in children and adolescents with suspected tuberculosis in a country with a high burden of tuberculosis. Method: This study included 581 children and adolescents aged 4 - 19 years who were suspected of having tuberculosis, were latently infected with Mycobacterium tuberculosis, and had received at least one dose of BCG vaccine between April 17, 2019, and February 24, 2021. The study evaluated the TST results of 106 patients who had a positive Quantiferon test and were suspected of having tuberculosis. Results: The study included 581 patients aged between 4 and 19 years. Of these, 106 patients tested positive for the Quantiferon test, while 19 were indeterminate and 456 were negative. The Quantiferon test positivity rate was 18.24%. Among the 106 QFT-Plus-positive cases, 23 patients also tested positive for TST. The difference in distribution was found to be statistically significant. Conclusion: The QFT-Plus test is considered an alternative to TST and other microbiological diagnostic methods for early tuberculosis diagnosis, particularly in children and adolescents.

Assessing the energy release characteristics during the middle detonation reaction stage of aluminized explosives

Afterburning behind the detonation front of an aluminized explosive releases energy on the millisecond timescale,which prolong the release of detonation energy and the energy release at different stages also shows significant differences.However,at present,there are few effective methods for evaluating the energy release characteristics of the middle reaction stage of such explosives,which can have a duration of tens to hundreds of microseconds.The present work demonstrates an approach to assessing the midstage of an aluminized explosive detonation based on a water push test employing a high degree of confinement.In this method,the explosive is contained in a steel cylinder having one end closed that is installed at the bottom of a transparent water tank.Upon detonation,the gaseous products expand in one direction while forcing water ahead of them.The resulting underwater shock wave and the interface between the gas phase products and the water are tracked using an ultra-high-speed framing and streak camera.The shock wave velocity in water and the expansion work performed by the gaseous detonation products were calculated to assess the energy release characteristics of aluminized explosives such as CL-20 and RDX in the middle stage of the detonation reaction.During the middle stage of the detonation process of these aluminized explosives,the aluminum reaction reduced the attenuation of shock waves and increased the work performed by gas phase products.A higher aluminum content increased the energy output while the presence of oxidants slowed the energy release rate.This work demonstrates an effective means of evaluating the performance of aluminized explosives.

Release test of alliin/alliinase double-layer tablet by HPLC-Allicin determination

A simple, precise and accurate method was developed and validated for the determination of allicin release from alliin/alliinase double-layer tablets. According to Appendix XC Ⅱ of Chinese Pharmacopoeia 2010 edition Volume II, a small glass-method was adopted at the rotational speed of 100 r/min using 100 mL phosphate buffer （pH 6.8） as release medium. The release amount was determined by HPLC with a C18 column （250 mm × 4.6 mm, 5 μm） using the mobile phase consisting of methanol -0.4% carboxylic acid （65：35） at a flow rate of 1 mL/min and UV detection at 242 nm. The current method demonstrates good linearity over the range 4.052- 405.2 μg/mL （r2=0.9999） with an average recovery of 105.5%（RSD= 1.25%）. The accumulative release of alliin/alliinase double-layer tablets had good homogeneity for withinand betweenbatches. The method established is simple, accurate and repeatable for the determination of allicin release from alliin/alliinase double-layer tablets.

Performance and correlation of interferon gamma release assays and tuberculin skin test in HIV-infected children and adolescents with immune reconstitution

Objective:To evaluate the performance of interferon gamma release assays and tuberculin skin test in HIV-infected children and adolescents with immune reconstitution.Methods:A cross-sectional study was conducted in HIV-infected patients aged 5-18 years receiving antiretroviral treatment with CD4 T-lymphocytes>25%or>500 cells/mm3 for at least 6 months.QuantiF ERON-TB Gold,T-SPOT.TB,and tuberculin skin test were performed in each patient.Results:A total of 50 patients were enrolled with median age of 13.7 years,CD4 counts of 753(IQR:587-989)cells/mm3.Among 27 patients with tuberculosis(16)or tuberculosis exposure(11),8(29.6%)were positive to at least one test,2(7.4%)were positive QuantiFERON-TB Gold,3(11.1%)positive T-SPOT.TB,and 7(25.9%)had tuberculin skin test≥5 mm.Among 23 patients without history of tuberculosis or exposure,all had negative interferon gamma release assays,while 2(8.7%)had positive tuberculin skin test.Conclusions:All tests had low sensitivity despite immune reconstitution.

Study on the Rapid Method to Predict Longevity of Controlled Release Fertilizer Coated by Water Soluble Resin

The study discussed the rapid method to test and predict the longevity of controlled release fertilizers （CRFs） coated by water soluble resin by using the short-term leaching under higher temperature. Pure water dissolving incubation and higher temperature leaching were used to study the patterns of the nutrient release of the CRFs. The correlation analysis between the days at 25℃ and the hours at 80℃ of Trincote 1 and Trincote 2 for the same cumulative release rates were conducted. Patterns of cumulative nutrient release curve followed one factor quadratic regression equation at each given temperatures, and each of relative coefficient was bigger than 0.995. As the temperature increased, nutrients release of the CRFs increased. The longevity of resin coated CRFs were predicted by use of both the cumulative nutrients release equation at 80℃ and the regression equation of release time needed for the same cumulative release rates between 25 and 80℃. There were only 0.3-6.9% relative errors between the tested longevity and predicted one. In conclusion, the longevity of resin coated CRFs could be predicted more quickly and precisely by use of the higher temperature short-term leaching method than that of the traditional differential release rate. The longevity of resin coated CRF could be rapidly and precisely predicted in a few hours by application of the higher temperature shortterm leaching method.

Monolithic LC method applied to fesoterodine fumarate low dose extended-release tablets:Dissolution and release kinetics

A dissolution test for fesoterodine low dose extended-release tablets using liquid chromatographic（LC） method equipped with a C18 monolithic column was developed and validated. LC system was operated isocratically at controlled temperature（40 1C） using a mobile phase of acetonitrile：methanol：0.03 M ammonium acetate（p H 3.8）（30：15：55, v/v/v）, run at a flow rate of 1.5 m L/min and detected at 208 nm. The best dissolution conditions for this formulation were achieved using a USP apparatus 2（paddle） at 100 rpm and 900 m L of phosphate buffer at p H 6.8 as the dissolution medium.Validation parameters such as the specificity, linearity, accuracy, precision, and robustness were evaluated according to international guidelines, giving results within the acceptable range. The kinetic parameters of drug release were also investigated using model-dependent methods and the dissolution profiles were best described by the Higuchi model. The validated dissolution test can be applied for quality control of this formulation.

Oxidative heat release intensity in coal at low temperatures measured by the hot-wire method

Directly measuring the oxidative heat release intensity at low temperatures is difficult at present.We developed a new method based on heat conduction theory that directly measures heat release intensity of loose coal at low temperatures.Using this method, we calculated the oxidative heat release intensity of differently sized loose coals by comparing the temperature rise of the coal in nitrogen or an air environment.The results show that oxidation heat release intensity of Shenhua coal sized 0～15 mm is 0.001～0.03 W/m3 at 30～90 °C and increases with increasing temperature.The heat release intensity at a given temperature is larger for smaller sized coal.The temperature effect on heat release intensity is muted as the coal size increases.At lower temperature the change in heat release intensity as a function of size becomes smaller.These results show that the test system is usable for practical applications and is easy to operate and is capable of measuring mass samples.

Energy Release Rate Measurement of Welded Bamboo Joints

Double cantilever beam tests were used to measure the energy release rates of linear vibrational welded moso bamboo joints.The influence of the length of the preserved cracks,the different combinations of the inner and outer bamboo surfaces and the moisture content is studied herein.The experimental compliance method,which is based on linear elastic fracture mechanics and has been shown to be an ideal method,was used to analyze data with the power equation.The results show that the preserved initial crack length does not have a significant effect on the final measured energy release rate,while the moso bamboo combination does affect the properties dramatically.The welded moso bamboo joints with inner-inner surfaces have the highest energy release rate of 122 J/m^2.The average energy release of the outer-outer combination was only 102 J/m^2.The expansion of the cracks also became easier when the moisture content of the welded joints was 18.5%compared to 4.5% and 10.1%.So the moisture resistance of the welded joints should be duly improved.

Mating behavior and sex pheromone release rhythm of Holotrichia parallela(Coleoptera: Melolonthidae)

Mating behavior and sex pheromone release rhythm of Holotrichia parallela was studied in this research. The maximum mating times were 3 for female and 4 for male. Average mating times were 1.06 for female and 0.91 for male. L-isoleucine methyl ester(LIME), a major component of pheromone, increased gradually from 14:00 and peaked at 19:00, then dropped sharply at 20:00 and remained low at 24:00.(R)-(-)-linalool(referred as linalool below) maintained similar levels throughout the study period. Calling and mating activity significantly decreased LIME titer, but not linalool. Analyses of 11 samples collected during calling days(20 d-70 d) revealed that LIME production was affected by female age. LIME titers increased from 20 d to 45 d, and decreased from 45 d to 70 d. While linalool titers remained at similar levels at all sampling dates. The highest ratio between LIME and linalool was 12 and the lowest was 4. Field tests confirmed that the most attractive ratios of LIME: linalool in early season(June 1 to 20) and late season(August 1 to 20) were 6:1, while in the most serious injury stage(June 20 to August 1) was 12:1. This is the first report about circadian rhythmicity of sex pheromone in Holotrichia parallela, which provides a basis for controlling it in field.

Rationale of Timed-Release Analysis and the Improvement of Flotation Experiment

The fundamental aspects of The Timed-Release Analysis (TRA) and some problems are analysed. Having studied the attribute of optimum flotation test results and the way of optimum test conditions, the auther put forward a proposal to improve this test method by adding a new test step of scavenging flotation and using optimum test conditions varied with different fine coals instead of the given ones settled by the TRA norm. Comparison between test results of the two methods of TRA shows that the improved method is very good.

地浸砂岩型铀矿松散岩层单动双管取心钻具的研制与试验

为解决单管钻具取心工艺方法在深部目的层/矿层等松散岩层取心中存在的取心质量差、取心效率低和操作难度大的问题,开展了地浸砂岩型铀矿松散岩层单动双管钻具的研制和试验。通过设计和改进单动机构、断心结构、液力退心机构和快拆机构,研制了两类分别具有可直接液力退心和快速拆卸功能的SD型单动双管钻具。试验结果表明:SD110型双管钻具可在免拆内管的情况下实现地表快速液力退心,提高双管钻具退心效率;SDKC110型钻具可快速拆装更换内管,实现退心和钻进平行作业。与单管钻具相比,SD系列单动双管钻具在松散岩层的平均回次长度提高28.62%,平均机械钻速提高11.61%;与常规单动双管钻具相比,退心操作时间降低了32.69%。SD系列单动双管钻具适用于在松散破碎地层进行取心钻进应用,可有效提高岩心采取效率和岩心质量。

基于鱼类上溯行为的导鱼堰设计与效果评估

河道内鱼类上溯路径不唯一,聚集位置更是难以预测,对鱼类上溯行为进行有效引导有助于提升过鱼设施进口的效率。为此,该研究提出了一种导鱼堰的概念和设计方法,结合姚家坪水电站的过鱼设施,利用流场三维数值模拟、鱼类洄游(active fish migration,AFM)模型和实鱼试验对导鱼堰的效果进行评估。结果表明:姚家平水利枢纽工程的导鱼堰上下游水面落差为0.36~0.40 m,过堰水流流速可达1.5~2.8 m/s,形成阻鱼的屏障,并在导鱼堰下游侧形成了诱导鱼类向集鱼渠进鱼口游动的唯一低流速上溯通道,鱼类聚集点趋于唯一,验证了导鱼堰方案的合理性。利用鱼类洄游模型对导鱼堰的导鱼效果进行预测,结果表明,下游高水位和低水位2种工况下,90%以上的鱼类游动路径均表现出相似的规律,鱼类沿河道右岸和导鱼堰下游侧的低流速通道上溯,并最终聚集在集鱼渠的进鱼口处。放鱼试验中试验个体全部进入集鱼渠,结果进一步证实导鱼堰可以有效引导鱼类游动路线,并在集鱼渠进鱼口处形成唯一的聚集区。本文提出的导鱼堰丰富了生态水工建筑物的形式,可为过鱼设施进口的水力设计及下游河道的局部整治提供参考。

简化PCOS患者胰岛素释放和糖耐量实验的效果评价

目的研究从检测时间点上简化多囊卵巢综合征(PCOS)患者胰岛素释放和糖耐量实验对评价胰岛素抵抗和糖代谢异常的效果。方法通过回顾性研究,选取2021年8月至2022年8月在我院就诊的320例已完成胰岛素释放和糖耐量试验(临床“金标准”)的PCOS患者,并假设研究对象只接受了简化方法一“空腹血糖和胰岛素检测”或简化方法二“空腹+糖负荷后2 h血糖和胰岛素检测”,评价两种简化方法的敏感度与临床“金标准”的一致性。结果患者总异常(即胰岛素抵抗或糖代谢异常)的发生率为80.0%(256/320),其中,超重/肥胖的患者和体重正常患者的总异常发生率分别为97.5%(115/118)和69.8%(141/202)。对于总异常的检测,超重/肥胖患者中简化方法一和简化方法二的敏感度分别为93.0%和96.5%(后者一致性检验Kappa=0.585);体重正常患者中,两种简化方法的敏感度分别为58.2%和74.5%。对于“糖代谢异常”的检测,超重/肥胖患者中,两种简化方法的敏感度分别为16.7%和100%(后者一致性检验Kappa=1.000)。结论对所有的PCOS患者均应进行胰岛素抵抗和糖代谢异常的检测;对于超重/肥胖PCOS患者,空腹+糖负荷后2 h血糖和胰岛素检测可以代替胰岛素释放和糖耐量实验;对于体重正常的PCOS患者,二种简化方法均有漏诊风险。

单时相GnRH激发试验对不同体重指数女童中枢性性早熟诊断价值的研究

目的 探讨单时相促性腺激素释放激素(gonadotropin-releasing hormone,GnRH)激发试验对不同体重指数(body mass index,BMI)女童中枢性性早熟(central precocious puberty,CPP)的诊断价值。方法 回顾性分析2017年1月—2023年8月在郑州大学第三附属医院就诊的7.5岁前出现乳房发育的760例女童数据。根据GnRH激发试验结果和临床表现综合诊断,分为CPP组(n=297)和非CPP组(n=463)。再根据体重指数(body mass index,BMI)分为正常体重组(n=540)、超重组(n=116)及肥胖组(n=104)。采用受试者操作特征曲线分析单时相GnRH激发试验对不同BMI女童CPP的诊断价值。结果 GnRH激发后30 min黄体生成素(luteinizing hormone,LH)/卵泡刺激素诊断CPP的曲线下面积为0.985,高于0、60、90 min LH/卵泡刺激素的曲线下面积(P<0.05)。30 min与60 minLH诊断价值相当(P>0.05)。30 min LH与BMI及BMI-Z值呈负相关(P<0.05)。30 min LH在正常体重、超重、肥胖女童中诊断CPP的曲线下面积分别为0.952、0.965、0.954 (P<0.05)。结论 30 min GnRH激发试验对不同BMI女童CPP均有较好的诊断价值,有望替代传统的GnRH激发试验,但应注意BMI对LH水平的影响。

中西医诊治儿童性早熟研究进展

目前,越来越多的无创诊断技术正在运用到儿童性早熟的诊断中,基因检测技术促进了该病遗传病因诊断的发展。对于该病的治疗,西医主要通过病因治疗继发性性早熟,对于特发性外周性性早熟没有特殊治疗方案,目前,中枢性性早熟治疗首选促性腺激素释放激素类似物(gonadotropin-releasing hormone agonist, GnRHa)。中医认为,性早熟病机为阴虚火旺,肝郁化火,痰湿壅滞,治以滋阴降火、疏肝解郁或燥湿化痰,可改善症状,抑制骨龄快速增长。但目前中医药治疗性早熟的临床研究证据等级不高,缺少样本量大、严格且全面的临床研究,未来可通过开展多中心的随机对照、大样本研究以验证中医药治疗性早熟的疗效。网络药理学和中药成分动物实验研究证明了中药治疗性早熟的部分机制,但中药方剂成分复杂,多通过胃肠道吸收后起效,是否可以调节肠道菌群、产生特异性菌群,该菌群是否改变了机体中某些代谢产物水平从而发挥治疗作用尚无相关研究,今后可开展更多的相关机制研究。

锂离子电池汽车全尺寸火灾试验研究进展综述

分析近年来国内外发生的锂离子电池电动汽车火灾事故,对电动汽车的火灾风险进行简要概括。重点针对美国、加拿大、奥地利、瑞典、中国等国家在锂离子电池电动汽车全尺寸火灾试验及火灾防控方面的科研成果进行综述。根据国内外研究成果,对不同电池容量的锂离子电池电动汽车的热释放速率进行汇总,重点总结燃烧总热释放量、热释放速率峰值和释放有毒氟化氢气体与电池容量的关系。旨在为我国锂离子电池电动汽车火灾防控和火灾风险评估技术研究提供必要的数据参考。

疑似ABO-HDN患儿的溶血三项检测结果及影响因素分析

目的检测疑似ABO新生儿溶血病(ABO-HDN)的溶血三项,并分析ABO-HDN的影响因素。方法回顾性分析2022年1~12月福鼎市医院收治的150例疑似ABO-HDN患儿的临床资料,所有患儿均进行溶血三项检测,收集所有患儿的相关资料,并分别采用单因素分析、多因素Logistic回归模型分析ABO-HDN的影响因素。结果150例疑似样本中108例被确诊为ABO-HDN,其中直接抗球蛋白试验阳性27例(25.00%),血清游离抗体检测阳性45例(41.67%),红细胞抗体释放试验阳性108例(100.00%),组合试验中,血清游离抗体试验联合红细胞抗体释放试验的阳性率最高;单因素分析结果显示,新生儿ABO-HDN与母-婴血型、妊娠次数、出生体质量和送检日龄有关(P<0.05);经多因素Logistic回归分析结果显示,母-婴血型(母亲血型为O型)(OR=2.303)、妊娠次数(≥2次)(OR=2.214)、出生体质量(≥3000 g)(OR=2.065)、送检日龄(1~3 d)(OR=2.090)是患儿发生ABO-HDN的危险因素(P<0.05)。结论溶血三项试验是ABO-HDN特异性诊断方法,及早检测有利于提高诊断准确率。母亲妊娠次数超过2次、母亲血型为O型、出生体质量高于3000 g、送检日龄1~3 d是ABO-HDN发生的危险因素。

高压电缆接头防爆保护装置的泄能孔优化设计方法

金属型高压防爆保护装置的泄能孔设计是实现其防爆功能的关键。本文提出了金属型高压电缆接头防爆保护装置泄能孔的设计原则和优化方法;通过热源等效和基于多物理场耦合的有限元计算方法,对保护装置内部发生短路电弧的爆炸时装置内部冲击过程进行仿真计算,并通过燃弧试验验证了仿真方法的准确性和可靠性。通过仿真计算出封闭设备泄压面积计算公式的关键参数,得到泄能孔开口尺寸的阈值;仿真了装置内部短路电弧爆炸时最大气压出现时刻以及该时刻下不同泄能孔尺寸所对应的保护装置内壁上的压强分布,得到保护装置内部最大压强与泄能孔开口尺寸的函数关系,进而得到保护装置的泄能孔最优开口尺寸。以35 kV电压等级为例,计算得到金属型保护装置的泄能孔尺寸为60 mm。该优化设计方法可为35 kV及以上电压等级的高压电缆接头保护装置的泄能孔设计和制造提供理论基础和设计方法。

中国肾移植受者结核病临床诊疗指南(2023版)

本指南旨在为肾移植受者结核病的临床管理提供全面而实用的指导。首先,概述了肾移植受者结核病的特殊性,强调了其高发生率及临床表现的多样性。为了更好地理解患者的病情,建议在移植前进行结核病相关的评估,并注意移植术后对结核病的监测。在诊断方面,详细介绍了目前常用的结核病诊断方法,并提供了在肾移植受者中的适用性评估。在确诊后,讨论了在免疫抑制药应用的背景下,如何平衡结核病治疗和排斥反应的策略,并关注了潜在的药物相互作用。预防方面,强调了在肾移植前对结核病的筛查。本指南旨在提高医务人员对肾移植受者结核病管理的认知,促进更有效的临床实践,提高受者的生活质量。

日用陶瓷制品镉迁移量在重复迁移试验中的变化

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