黑参中人参皂苷Rg_3的含量测定

目的:建立黑参中人参皂苷Rg_3的含量测定方法。方法:利用高效液相色谱法,采用Thermo色谱柱(250 mm×4.6 mm,5μm),以乙腈-水为流动相梯度洗脱,测定黑参中人参皂苷Rg_3含量。结果:研究表明,不同批次黑参中人参皂苷Rg_3的含量差别明显,平均含量为1.236 5 mg·g~(-1),最低含量为0.368 7 mg·g~(-1),最高含量为2.500 7 mg·g~(-1),相差6.8倍。结论:建立了黑参中人参皂苷Rg_3含量的测定方法,对不同批次样品进行测定后发现,人参皂苷Rg_3含量差别明显,为黑参的质量控制和开发利用提供参考。     

青岛市2018年1例疟疾死亡病例分析

目的 分析青岛市2018年1例输入性恶性疟的死亡原因,为预防疟疾死亡病例发生提供参考。方法 访谈接诊医生及患者家属,对患者病历和流行病学调查资料进行分析。结果 患者刘某,男,35岁,青岛市城阳区人,2018年3月19日到科特迪瓦务工,7月17日回国。25日患者到韩国办事,26日下午出现发冷、发热、出汗、头痛、浑身酸痛等症状,26—27日自服退烧药无好转,28日上午到韩国某医院就诊,未明确诊断,下午出现腹泻、呕吐症状,29日下午回国,14∶59到城阳区人民医院就诊,精神萎靡,经询问患者有非洲出国史可能患疟疾,16∶30将患者转诊至疟疾治疗定点医院,17∶50到达青岛市传染病医院时患者呈深昏迷状态,医生考虑患者病情危重且该院正在改建无ICU病房,建议转至有抢救条件的综合医院抢救。19:40患者转入海慈医疗集团ICU病房,21∶00被确诊为恶性疟,因病情危重,患者于30日14∶15死于多脏器功能衰竭。结论 对于输入性疟疾,根据流行病学史、临床症状和实验室检测结果尽早明确诊断,尽早使用抗疟药治疗,是避免出现死亡病例的关键。     

Parts‐based representations of perceived face movements in the superior temporal sulcus

Facial motion is a primary source of social information about other humans. Prior fMRI studies have identified regions of the superior temporal sulcus (STS) that respond specifically to perceived face movements (termed fSTS), but little is known about the nature of motion representations in these regions. Here we use fMRI and multivoxel pattern analysis to characterize the representational content of the fSTS. Participants viewed a set of specific eye and mouth movements, as well as combined eye and mouth movements. Our results demonstrate that fSTS response patterns contain information about face movements, including subtle distinctions between types of eye and mouth movements. These representations generalize across the actor performing the movement, and across small differences in visual position. Critically, patterns of response to combined movements could be well predicted by linear combinations of responses to individual eye and mouth movements, pointing to a parts‐based representation of complex face movements. These results indicate that the fSTS plays an intermediate role in the process of inferring social content from visually perceived face movements, containing a representation that is sufficiently abstract to generalize across low‐level visual details, but still tied to the kinematics of face part movements.     

Isolation and characterization of cellulose from date palm tree spathe sheath

This study deals with a series of operations to isolate the micro-cellulose from the palm tree spathe sheath by using a modified chemical method to take into account the low cost and the completion speed and its characterization using X-ray diffraction technique (XRD), infrared spectroscopy (FTIR) and scanning electron microscope coupled with element analyzer (SEM/EDX). The results showed that the extraction method succeeded in obtaining very pure microscopic fibers with a width of 2–10 μm with a crystallinity index equal to 79.21%, containing the two cellulose features Iβ and II, that, the conversion ratio of the first to the second was estimated at 32, 87%.