A sensitive fluorometric sensor for Ag+ based on the hybridization chain reaction coupled with a glucose oxidase dual-signal amplification strategy

In this work, an efficient and sensitive fluorometric sensor was developed to detect silver ions (Ag⁺). It is based on the cytosine–Ag⁺–cytosine (C–Ag⁺–C) structure via a dual-signal amplification strategy using glucose oxidase (GOx) and the hybridization chain reaction (HCR). A silver-coated glass slide (SCGS) acts as an ideal material for separation. Cytosine rich (C-rich) capture DNA (C-DNA) assembled themselves on the SCGS via Ag–S bonds and hybridized with signal DNA (S-DNA) to trigger the HCR. With specific base-pairing, the S-DNA and HCR products bind on the SCGS. Then, the GOx–biotin–streptavidin (SA) complexes bind to the HCR products through SA–biotin interactions. Owing to the formation of a particular C–Ag⁺–C structure between two neighboring C-rich C-DNA on the SCGS, the C-DNA/S-DNA/HP1-GOx/HP2-GOx complex gradually moved away from the SCGS as the concentration of Ag⁺ increased and the combined GOx fell into the buffer. H₂O₂ could be generated during the oxidation of glucose, catalyzed by GOx in the buffer. Afterward, H₂O₂ could oxidize the substrate (3-(p-hydroxyphenyl)-propanoic acid) when Horseradish peroxidase was present, giving rise to blue fluorescence. The proposed strategy reached a limit of detection (LOD) of 1.8 pmol L⁻¹ with a linear detection range of 5 to 1000 pmol L⁻¹ for Ag⁺. Moreover, this assay has been commendably used for the detection of Ag⁺ in actual samples with fairly good results.

An assay for Ag⁺ based on a C–Ag⁺–C structure by utilizing a HCR/GOx dual-signal amplification strategy and SCGS as an ideal separation material.     

国内外智慧医养平台研究的可视化分析

目的采用文献计量学方法比较国内外智慧医养平台的研究现状,从宏观层面为我国健康养老产业的智慧化转型提供参考。方法以Web of Science核心合集和CNKI为来源,分析2010—2020年国内外的研究进展,利用数据库的分析功能和VOSviewer、CiteSpace软件对智慧医养平台的研究情况和研究热点进行定量分析和可视化展示,并对纳入文献进行定性分析。结果最终纳入166篇英文文献,78篇中文文献。国内外年发文量总体呈增长趋势,研究领域涉及多个学科。国外智慧医养平台相关研究中出现次数较多的关键词为“assistive technology”“elderly”“smart home”“e-health”“telecare”“rehabilitation”;国内出现次数排序前5名的关键词分别为“智慧养老”“物联网”“智能家居”“互联网+”“医养结合”。国外研究在平台技术准备、功能、隐私和数据保护、效果评价4个方面更加深入和多样。结论智慧医养平台及其相关技术的学术研究发展稳健且多样。但相较于国外,国内在内容和技术方面还存在一定差距,需要在符合国情的基础上借鉴和学习国外优秀技术和理念,促进智慧医养平台的进一步发展。     

徒手旋转在头位难产产妇助产护理中的应用

目的:观察并分析在头位难产助产护理中对产妇应用徒手旋转的效果。方法:选取本院产科收治的84例头位难产产妇为研究对象,按入院顺序将其分为对照组(42例,常规助产护理)与观察组(42例,徒手旋转助产护理)。评价两组的助产护理效果。结果:观察组产妇自然分娩率及新生儿Apgar评分显著高于对照组,第二产程时间、产后出血量以及新生儿不良反应发生率则明显低于对照组,数据差异明显,P<0.05。结论:徒手旋转的助产护理方式可缩短头位难产产妇的产程时间,降低剖宫产率及新生儿并发症发生率,确保分娩的顺利进行。     

ICU患者双上肢握力及髋关节屈曲拉力水平及其影响因素

目的调查ICU患者双上肢握力及髋关节屈曲拉力及其主要影响因素。 方法选取2019年4月至7月青海省人民医院77例ICU患者为研究对象,男性55例,女性22例,平均年龄（56.09±18.44）岁。收集患者一般病例资料（包括一般社会学资料,入住ICU后,出ICU前及出ICU时评价指标）,测量其在入住ICU时和出ICU时双上肢握力及髋关节屈曲拉力。 结果患者入住ICU时及出ICU时,上肢握力分别为（22.14±10.91）kg、（23.22±12.01）kg,差异有统计学意义（t=2.490,P=0.015）;髋关节屈曲拉力分别为（9.99±6.23）kg、（11.14±7.87）kg,差异有统计学意义（t=4.605,P＜0.001）。患者出ICU时,ADL评分较入住ICU时有显著改善,差异有统计学意义（Z=4.401,P＜0.001）,患者营养不良比例、红细胞、血红蛋白较入住ICU时有显著性下降,差异有统计学意义（χ²=65.07,t=5.208,t=2.688,P＜0.05）,其余化验指标均无显著性改变（P＞0.05）。患者上肢握力与年龄（r=-0.540）、性别（r=-0.415）、婚姻状况（r=-0.512）、住ICU天数（r=-0.304）、机械通气天数（r=-0.246）、人工气道天数呈显著性负相关（r=-0.224）,与ADL评分（r=0.316）呈显著正相关;髋关节屈曲拉力与性别（r=-0.452）、营养状态（r=-0.334）呈显著负相关。 结论ICU患者上肢握力及髋关节屈曲拉力呈现较低水平,随着疾病恢复逐渐增强。对于高龄、女性、有吸烟史、有饮酒史及已婚的患者在住ICU期间要更加关注其肌肉健康状态,患者住ICU期间要根据病情尽早拔除人工气道、缩短机械通气的时间,同时要加强患者的营养,为预防ICU患者肌肉衰减做好预防工作。     

Needle tract seeding of papillary thyroid carcinoma after fine-needle capillary biopsy: A case report

BACKGROUNDFine-needle biopsy is an accurate and cost-efficient tool for the assessment of thyroid nodules. It includes two primary methods: Fine-needle capillary biopsy (FNCB) and fine-needle aspiration biopsy. Needle tract seeding (NTS) is a rare complication of thyroid fine-needle biopsy mainly caused by fine-needle aspiration biopsy rather than FNCB. Here, we present an extremely rare case of a papillary thyroid carcinoma (PTC) patient with FNCB-derived NTS. CASE SUMMARYWe report a 32-year-old woman with PTC who showed subcutaneous NTS 1 year after FNCB and thyroidectomy. NTS was diagnosed based on clinical manifestations, biochemistry indices, and imaging (computed tomography and ultrasound). Pathological identification of PTC metastases consistent with the puncture path is the gold standard for diagnosis. Surgical resection was the main method used to treat the disease. After surgery, thyroid function tests and ultrasound scans were performed every 3-6 mo. To date, no evidence of tumor recurrence has been observed.CONCLUSIONFNCB is a safe procedure as NTS is rare, and can be easily removed surgically with no recurrence. Accordingly, NTS should not limit the usefulness of FNCB.     

Dynamic fluorescence lifetime sensing with CMOS single-photon avalanche diode arrays and deep learning processors

Measuring fluorescence lifetimes of fast-moving cells or particles have broad applications in biomedical sciences. This paper presents a dynamic fluorescence lifetime sensing (DFLS) system based on the time-correlated single-photon counting (TCSPC) principle. It integrates a CMOS 192 × 128 single-photon avalanche diode (SPAD) array, offering an enormous photon-counting throughput without pile-up effects. We also proposed a quantized convolutional neural network (QCNN) algorithm and designed a field-programmable gate array embedded processor for fluorescence lifetime determinations. The processor uses a simple architecture, showing unparallel advantages in accuracy, analysis speed, and power consumption. It can resolve fluorescence lifetimes against disturbing noise. We evaluated the DFLS system using fluorescence dyes and fluorophore-tagged microspheres. The system can effectively measure fluorescence lifetimes within a single exposure period of the SPAD sensor, paving the way for portable time-resolved devices and shows potential in various applications.     

灼口综合征生物神经及社会心理性疾病模式的研究进展

灼口综合征(burning mouth syndrome,BMS)病因尚不明确,尚无有效的治疗方法,临床患者日渐增多。BMS是以舌部为主要发病部位,以烧灼样疼痛为典型表现的一组综合征。常不伴有明显的临床损害体征;无特征性的组织病理变化。由于持续的疼痛困扰以及不理想的用药效果,患者就医时往往有较高的期望值,就医后容易有较大的失望感,存在医患纠纷的隐患。作者对BMS的流行病学现状、临床表现、病因、分型、诊断标准及治疗等方面进行综述,以期对BMS的临床诊疗提供指导。     

In vivo and ex vivo actions of a novel P. gingivalis inhibitor on multi‐species biofilm,inflammatory response,and periodontal bone loss

Chronic periodontitis is one of the most common infectious inflammatory diseases worldwide. Current therapeutic options for the disease are only partially and temporarily successful due to periodontal re‐emergence of pathogens such as Porphyromonas gingivalis, a keystone bacterium in the oral microbial communities, which elicits a dysbiosis between the microbiota and the host. Previously, we reported a peptide inhibitor of P. gingivalis (SAPP) that specifically targets P. gingivalis and reduces its virulence potential in vitro. Here, we show that SAPP can modulate the ability of P. gingivalis to suppress the host innate immune system. Using a cytokine array analysis, we found that the levels of several cytokines including IL‐6, IL‐8, and MCP‐1 in the culture media of human oral keratinocytes (HOKs) were significantly diminished in the presence of P. gingivalis. Whereas the levels of these cytokines were restored, at least partially, in the culture media of HOKs by SAPP treatment. Furthermore, we also observed in an ex vivo assay that SAPP efficiently inhibited biofilm primed formation by mixed‐species oral bacteria, and significantly dampened the abnormally innate immune responses induced by these bacteria. We also demonstrated, using a mouse model, that SAPP could prevent alveolar bone loss induced by P. gingivalis. Our results suggest that SAPP specifically targets P. gingivalis and its associated bacterial communities and could be envisioned as an emerging therapy for periodontitis.