Neural representation of phonological information during Chinese character reading

Previous studies have revealed that phonological processing of Chinese characters elicited activation in the left prefrontal cortex, bilateral parietal cortex, and occipitotemporal regions. However, it is controversial what role the left middle frontal gyrus plays in Chinese character reading, and whether the core regions (e.g., the left superior temporal gyrus and supramarginal gyrus) for phonological processing of alphabetic languages are also involved in Chinese character reading. To address these questions, the present study used both univariate and multivariate analysis (i.e., representational similarity analysis, RSA) to explore neural representations of phonological information during Chinese character reading. Participants were scanned while performing a reading aloud task. Univariate activation analysis revealed a widely distributed network for word reading, including the bilateral inferior frontal gyrus, middle frontal gyrus, lateral temporal cortex, and occipitotemporal cortex. More importantly, RSA showed that the left prefrontal (i.e., the left middle frontal gyrus and left inferior frontal gyrus) and bilateral occipitotemporal areas (i.e., the left inferior and middle temporal gyrus and bilateral fusiform gyrus) represented phonological information of Chinese characters. These results confirmed the importance of the left middle frontal gyrus and regions in ventral pathway in representing phonological information of Chinese characters.     

HPLC-MS/MS法测定人体血浆中丙泊酚的浓度及其药动学研究(英文)

目的:采用HPLC-MS/MS法检测人体血浆中丙泊酚的浓度,并将该方法用于临床药动学研究。方法:采用Zorb-ax Eclipse XDB-C18(50 mm×4.6 mm,5μm)色谱柱分离;流动相为甲醇和0.1%氨水二元梯度洗脱系统;流速为0.3 mL.min-1;通过电喷雾离子化电离源(ESI),采用负离子检测。结果:线性范围为0.010～12μg.mL-1,相关系数≥0.99,定量下限为0.010μg.mL-1。日内及日间精密度不高于15%,准确度的相对误差(RE)在-2.0%～5.0%。药代动力学符合三室模型,清除率为0.029 L.min-1.kg-1,中央室分布容积为0.60 L.kg-1,血药浓度消除半衰期t1/2α为0.84 min,t1/2β为6.7 min,t1/2γ为128.7 min。结论:该方法高效、灵敏,特异性强,准确度、精密度好,适用于丙泊酚药物动力学研究。     

A Three-Dimensional Equivalent Stiffness Model of Composite Laminates with Wrinkle Defects

The stiffness of composite laminates is easily affected by wrinkle defects. In this paper, a new effective analytical model was proposed to predict the three-dimensional equivalent elastic properties of multidirectional composite laminates with wrinkle defects. Firstly, a geometric model was established according to the microscopic characteristics of wrinkle defects. Then, based on the classical laminate theory and homogenization method, the constitutive equation and flexibility matrix of the wrinkle region were established. Finally, the equivalent stiffness parameters of unidirectional and multidirectional laminates were derived, and the effects of different wrinkle parameters and ply-stacking sequences on the stiffness of unidirectional and multidirectional laminates were studied by using the analytical model. The results show that the mechanical properties of the lamina and laminates are affected by the out-of-plane angle and in-plane angle of the wrinkle defects. The accuracy of the analytical model has been verified by the numerical model and other theoretical models, and it has the characteristics of few parameters and a high efficiency. The analytical model can be used to predict the stiffness of composite structures with wrinkle defects simply, effectively, and quantitatively. It can also be used as a tool to provide the mechanical response information of laminates with wrinkle defects.     

榄香烯乳联合洛铂腹腔热灌注治疗中晚期结直肠癌恶性腹水的临床研究

目的 探讨榄香烯乳联合化疗药物洛铂腹腔热灌注对中晚期恶性结直肠癌腹水的临床疗效.方法 对2017年1月至2019年12月,广州医科大学附属肿瘤医院诊断为中晚期大肠癌并伴恶性腹水的患者共40例,按照入组条件,遵循抛硬币法分为治疗组(20例),对照组(20例),对照组予单药洛铂(50 mg),治疗组予洛铂(50 mg)加中...     

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根据罗马Ⅲ标准,儿童上消化道功能性疾病包括呕吐和吞气症(青少年反刍综合征、周期性呕吐综合征、吞气症),腹痛相关的功能性胃肠病(功能性消化不良)。本文主要阐述周期性呕吐综合征和功能性消化不良。1小儿周期性呕吐综合征近年儿科界对周期性呕吐综合征(cyclic vomiting syn-drome,CVS)的定义[1]为:3次或更多次的发作性的顽固的恶心和呕吐,每次发作持续数小时至数日,2次发作间有长达数周至数月的完全无症状的间歇期。患者不存在任何代谢、神经、胃肠等各系统的异常。1.1流行病学[1-3]CVS确切的流行病学尚未完全清楚。20世纪60年代报道为…     

Resistin induces insulin resistance, but does not affect glucose output in rat-derived hepatocytes

AIM: The aim of the present study was to observe the effects of resistin on insulin sensitivity and glucose output in rat-derived hepatocytes. METHODS: The rat hepatoma cell line H4IIE was cultured and stimulated with resistin; supernant glucose and glycogen content were detected. The insulin receptor substrate (IRS)-1 and IRS-2, protein kinase B/Akt, glycogen synthase kinase-3beta(GSK-3 beta), the suppressor of cytokine signaling 3 (SOCS-3) protein content, as well as the phosphorylation status were assessed by Western blotting. Specific antisense oligodeoxynucleotides directed against SOCS-3 were used to knockdown SOCS-3. RESULTS: Resistin induced insulin resistance, but did not affect glucose output in rat hepatoma cell line H4IIE. Resistin attenuated multiple effects of insulin, including insulin-stimulated glycogen synthesis and phosphorylation of IRS, protein kinase B/Akt, as well as GSK-3beta. Resistin treatment markedly induced the gene and protein expression of SOCS-3, a known inhibitor of insulin signaling. Furthermore, a specific antisense oligodeoxynucleotide directed against SOCS-3 treatment prevented resistin from antagonizing insulin action. CONCLUSION: The major function of resistin on liver is to induce insulin resistance. SOCS-3 induction may contribute to the resistin-mediated inhibition of insulin signaling in H4IIE hepatocytes.     

健康促进对产后抑郁症患者生活质量影响的研究

目的 探讨健康促进对产后抑郁症患者生活质量的影响.方法 将182例产后抑郁症患者随机分为实验组与对照组,每组各91例,实验组施行健康促进,对照组只实行常规护理,24 w后采用生活质量量表(SF-36QOL)测定其生活质量.结果 实验组生活质量非常显著高于对照组(P＜0.001).结论 健康促进提高了产后抑郁症患者的生活质量.     

藏药八味沉香散50％醇提部位对急性心肌缺血大鼠作用的研究

目的：研究八味沉香散50％醇提部位对垂体后叶素诱发的急性心肌缺血大鼠的作用。方法：采用大鼠舌下静脉注射垂体后叶素复制急性心肌缺血模型,实验大鼠随机分为正常对照组、模型对照组、阳性对照组、八味沉香散50％醇提液大、小剂量组。观察八味沉香散50％醇提液对大鼠注射垂体后叶素后血清乳酸脱氢酶（LDH）、肌酸激酶（CK）和心肌超微结构的影响。结果：与模型对照组比较,八味沉香散50％醇提液预处理后可明显减少大鼠血CK和LDH的释放（均P〈0.01）,并减轻心肌超微结构线粒体的损伤。结论：八味沉香散50％醇提液对垂体后叶素所致大鼠急性心肌缺血具有一定的保护作用,而抗心肌缺血的作用可能与其保护心肌线粒体结构,改善缺血心肌的能量代谢有关。     

Optimization of Supercritical Fluid Extraction and Rapid Resolution LC-MS/ESI Identification of Chromones from Saposhnikoviae Radix through Orthogonal Array Design

Objective To establish a rapid and effective supercritical fluid extraction(SFE) and rapid resolution liquid chromatography method coupled with diode-array detector(RRLC-DAD) to quantify the chromones in a species. Methods The effects of four parameters including ethanol concentration(50%-90%), pressure(25-45 MPa), temperature(40-60 ℃), and time(30-90 min) on the chromones yields, namely prim-O-glucosylcimifugin, cimifugin, 5-O-methylvisammioside, and sec-O-glucosylhamaudol, were investigated using SFE system with orthogonal array design(OAD). Furthermore, the extracts were analyzed using rapid resolution liquid chromatography coupled with diode-array detector(RRLC-DAD) system to confirm the results. Results Under the optimized conditions, i.e., 35 MPa of pressure, 60 ℃ of temperature, 70% ethanol, and 60 min of time, the yields of prim-O-glucosylcimifugin, cimifugin, 5-O-methylvisammioside, sec-O-glucosylhamaudol, and total chromones were 3.514, 0.132, 6.242, 0.342, and 10.231 mg/g, respectively. In comparison with ultrasonic assisted extraction(UAE), SFE was able to yield a 20.7% increase in the total chromones from Saposhnikoviae Radix. Conclusion SFE is an alternative and promising method to extract chromones from this species, and the established RRLC-DAD method could serve as a rapid and effective method for the identification of chromones from Saposhnikoviae Radix.     

A reproductive screening test of hawthorn

AIM OF STUDY: Hawthorn (Crataegus) has a long history as a medicine. The current clinical use of hawthorn as a heart medicine dates back to the late 19th century. It is well tolerated clinically yet contraindicated in pregnancy. MATERIALS AND METHODS: To determine the safety of hawthorn to the developing fetus, pregnant rats were dosed daily by gavage using 56 times the human dose of hawthorn on either gestation days (GD) 1-8 or GD 8-15. On GD 20, fetuses were weighed and examined for signs of external, internal or skeletal malformations. Rat fetuses were also explanted on GD 10.5 and cultured with hawthorn extract for 26 h. RESULTS: Hawthorn did not have an adverse effect on embryonic development in vivo or in vitro. CONCLUSIONS: While the results suggest that hawthorn, taken at the recommended dose would have no adverse effects on embryonic development this may be due to the low bioavailability of some hawthorn constituents when taken orally. Pharmacokinetic studies are required to determine the extent of absorption of hawthorn from the small intestine in healthy adults in order to verify its safety.