杭白菊提取物中辅料麦芽糊精的中红外快速定量分析

目的建立一种对杭白菊提取物中麦芽糊精含量进行快速定量的中红外分析方法。方法以78份不同麦芽糊精含量的杭白菊提取物为实验对象,对采集到的已知麦芽糊精含量的样品谱图进行图谱预处理,以偏最小二乘法建立含量测定模型。结果所建含量测定模型的决定系数R²为0.9987,预测标准差为1.137。结论所建含量测定模型测定效果较好、稳定性强、检测精度高,可用于杭白菊提取物中麦芽糊精含量的快速分析。     

血清中PGⅠ、PGⅡ及G-17检测在胃癌早期诊断中的应用

目的 研究血清中胃蛋白酶原Ⅰ（PGⅠ）、胃蛋白酶原Ⅱ（PGⅡ）及胃泌素-17（G-17）检测在胃癌早期诊断中的应用价值。方法 选择2017年1月~2019年1月本院收治的胃病患者98例,其中胃癌患者48例设为观察A组,萎缩性胃炎患者50例设为观察B组,另选取同期体检健康者50例设为对照组,分别行PGⅠ、PGⅡ及G-17检测,并以胃镜或手术结果为对照,分析PGⅠ、PGR（PGⅠ/PGⅡ）及G-17单项及联合诊断结果。结果 PGⅠ、PGR及G-17联合诊断的准确度高于单项检测,差异有统计学意义（P＜0.05）;联合诊断敏感性高于PGR、G-17单项检测,差异有统计学意义（P＜0.05）;对照组、观察B组、观察A组PGⅠ、PGR依次下降,PGⅡ依次升高,差异有统计学意义（P＜0.05）;观察A组G-17高于观察B组,差异有统计学意义（P＜0.05）。结论 血清中PGⅠ、PGⅡ及G-17单项检测在胃癌早期诊断中均具有一定价值,但联合检测可进一步提高诊断准确性,应用价值更高。     

苦参素治疗慢性荨麻疹患者疗效及外周血Foxp3+调节性T细胞的检测

8,P<0.01),而联合用药组与苦参素两组比较差异无统计学意义(t=0.529,P>0.05).注射苦参素能显著升高荨麻疹患者外周血中Foxp3+CD4+CD25+T细胞数量,苦参素各剂量组与正常人对照组及咪唑斯汀组比较差异有统计学意义(t=24.88,P<0.01).结论 苦参素对慢性荨麻疹患者疗效显著.苦参素能显著升高慢性荨麻疹患者外周血中Foxp3+CD4+CD25+T细胞数量.     

LPS和雨蛙肽诱导大鼠离体胰腺组织损伤并抑制HSP60蛋白的变化

目的：观察脂多糖（LPS）、雨蛙肽（cerulein）刺激对大鼠离体胰腺组织热休克蛋白60（HSP60）表达的影响。方法: 分离培养大鼠离体胰腺组织,用低、高浓度cerulein (Cer;10-11mol/L,10-5mol/L)或LPS（10 mg/L,20 mg/L）刺激,以生理盐水（NS）作为对照,在刺激前和刺激后1、4h测定胰腺组织的活力（MTT法）、胰蛋白酶原活性肽（TAP）水平（ELISA测定）,培养上清液中白介素6（IL-6）水平（ELISA测定）;并用 real-time PCR和Western blotting分别测定胰腺组织HSP60 mRNA和蛋白的表达。结果: 低、高浓度的cerulein和LPS刺激胰腺组织后1 h,组织的活力与NS对照组比较稍有下降（P>0.05）,刺激4h后,组织活力明显降低（P<0.05）;组织中TAP水平在高浓度cerulein和低、高浓度的LPS刺激下明显升高;其培养上清液中IL-6水平在刺激后1 h变化不明显,4 h时升高,尤其以高浓度的cerulein或LPS作用显著（P<0.05）。胰腺组织HSP60 mRNA和蛋白的表达量随LPS刺激时间的延长和浓度的升高而降低;而低、高浓度的cerulein刺激HSP60 mRNA的表达增加,但蛋白的表达降低,以高浓度、长时间刺激的作用为明显(P<0.05)。结论: LPS及cerulein对离体胰腺组织具有损伤作用,并呈一定时间及浓度依赖性;同时,胰腺组织HSP60蛋白表达降低,提示HSP60细胞保护作用的减弱可能参与该损伤过程。     

口腔颌面部恶性肿瘤术后患者心理痛苦及相关因素分析

目的探索口腔颌面部恶性肿瘤术后患者心理痛苦状况并分析其相关因素,为开展有效心理支持干预提供参考。方法采用心理痛苦温度计及其相关问题列表、自尊量表、知觉压力量表对399例口腔颌面部恶性肿瘤术后患者进行调查。结果口腔颌面部恶性肿瘤术后患者心理痛苦得分为(3.34±2.81)分,显著心理痛苦水平检出率为43.6%。患者心理痛苦水平与自尊水平呈负相关,与知觉压力水平呈正相关(均P<0.01)。Logistic回归分析结果表明,人均月收入、无时间精力做家务、经济问题、恐惧、悲伤、担忧、睡眠问题、便秘、口腔疼痛、疼痛等是口腔颌面部恶性肿瘤患者术后心理痛苦的影响因素(P<0.05,P<0.01)。结论口腔颌面部恶性肿瘤患者术后心理痛苦检出率较高,影响因素较多,医护人员应予以重视并给予有效措施减轻其心理痛苦水平。     

Chinese herbal compounds containing scorpion in the treatment of epilepsy: A protocol for systematic review and meta-analysis

Background:Epilepsy is 1 of the common neurodevelopmental diseases. It can affect about 0.5% to 1.0% of the population regardless of their race and social class. Despite the development of a wide range of treatments, there remaining about one-third of patients still experience seizures. Chinese herbal compounds containing scorpion (CHCCS) have shown an outstanding curative effect on nerve protection and epilepsy. But there''s no study to assess its clinical efficacy and safety.Methods:Each data of CHCCS in treating epilepsy from related English and Chinese databases will be searched. The primary outcome is the efficacy of the CHCCS on epilepsy. And the secondary outcomes include recurrence rate and side effects. The risk of bias will be assessed, and RevMan5.3 and Stata14.0 will be performed for meta-analysis. Finally, we will assess the level of the resulting evidence.Results:The results of the study will be combined with current evidence and published in a peer-reviewed journal.Conclusions:This study will specifically investigate the effectiveness and safety of CHCCS in treating epilepsy.INPLASY registration number:INPLASY202120056.     

Clinicopathologic features and clinical outcomes of intravenous leiomyomatosis of the uterus: A case series

Rationale:Intravenous leiomyomatosis (IVL) is a rare and special type of smooth muscle tumor originating in the uterus. It is classified as a benign disease according to its histological features but shows the behavioral characteristics of a malignant tumor. It is easily misdiagnosed and recurrent. The purpose of this study was to retrospectively analyze clinicopathological data of 25 cases of IVL in order to enhance clinicians’ understanding of this rare disease.Patient concerns:We screened and identified 25 cases of IVL at our hospital from October 2013 to January 2020. Five patients had tumors.Diagnoses:The diagnosis in each case was pathologically confirmed after surgical treatment.Interventions:All patients were managed surgically. Although the surgical procedures were different, the surgical approach was geared towards achieving complete excision. Three patients received hormonal therapy with gonadotropinreleasing hormone agonists after surgery.Outcomes:We retrospectively reviewed all medical records and analyzed the clinicopathologic features and clinical outcomes of this disease as well as the correlations between the clinical features and risk of recurrence. Neither the symptoms nor the preoperative imaging results were suggestive of IVL in any of the cases. Except for two patients who were lost to follow-up, twenty-three patients who were followed up are still alive. Three patients experienced a recurrence.Lessons:The clinical manifestations and ultrasound images of IVL in the early stages are not typical; thus, IVL is easily misdiagnosed as uterine leiomyoma. Radiologists, pathologists, and surgeons should have a thorough understanding of IVL and a high index of vigilance for IVL in clinical practice. Surgery should always be aimed at achieving complete tumor excision. Patients with large lesions (≥7 cm) and lesions extending to the broad ligament may have an increased risk of recurrence. Early detection, diagnosis, and treatment are very important; once the diagnosis is confirmed, regular follow-ups are crucial.     

虾青素抑制氧化应激改善陈旧红细胞保存质量

目的:观察虾青素能否抑制陈旧悬浮红细胞内的氧化应激,改善红细胞保存质量。方法:采集志愿者血液,制备去白悬浮红细胞,将其随机分为4组,对照组加入DMSO,另外3组悬浮红细胞的保存液内加入抗氧化剂虾青素使其终浓度分别为5、10和20μmol/L,悬浮红细胞于2℃~6℃内保存。保存至28 d、42 d采用倒置荧光显微镜观察悬浮红细胞内活性氧族的表达状况,采用荧光酶标仪测定红细胞内活性氧族的含量,采用硫代巴比妥酸比色法测定红细胞内丙二醛含量,扫描电镜观察红细胞的超微结构,采用化学比色法测定三磷酸腺苷含量,采用紫外测试法测定2,3-二磷酸甘油酸含量。结果:与各自对照组相比,加虾青素的三组储存28 d和42 d悬浮红细胞内活性氧族和丙二醛含量降低,三磷酸腺苷和2,3-二磷酸甘油酸水平升高,改善了红细胞的形态。结论:虾青素可以通过降低储存悬浮红细胞内的氧化应激水平改善红细胞保存质量。     

Interaction of oxalic acid with methylamine and its atmospheric implications

Oxalic acid, which is one of the most common dicarboxylic acids, is expected to be an important component of atmospheric aerosols. However, the contribution of oxalic acid to the generation of new particles is still poorly understood. In this study, the structural characteristics and thermodynamics of (C₂H₂O₄)(CH₃NH₂)_n (n = 1–4) were investigated at the PW91PW91/6-311++G(3df,3pd) level of theory. We found that clusters formed by oxalic acid and methylamine are relatively stable, and the more the atoms participating in the formation of a ring-like structure, the more stable is the cluster. In addition, via the analysis of atmospheric relevance, it can be revealed that clusters of (C₂H₂O₄)(CH₃NH₂)_n (n = 1–4) have a noteworthy concentration in the atmosphere, which indicates that these clusters could be participating in new particle formation. Moreover, by comparison with (H₂C₂O₄)(NH₃)_n (n = 1–6) species, it can be seen that oxalic acid is more readily bound to methylamine than to ammonia, which promotes nucleation or new particle formation. Finally, the Rayleigh scattering properties of clusters of (C₂H₂O₄)(CH₃NH₂)_n (n = 1–4) were investigated for the first time to determine their atmospheric implications.

Oxalic acid, which is one of the most common dicarboxylic acids, is expected to be an important component of atmospheric aerosols.     

Synergistic effect of graphene and silicon dioxide hybrids through hydrogen bonding self-assembly in elastomer composites

A novel graphene–silicon dioxide hybrid (HGS) was prepared by plant polyphenol-tannic acid (TA) functionalized pristine graphene (G-TA) and primary amine-containing silane coupling agent modified SiO₂ (Si–NH₂). Through strong hydrogen-bonding interaction between the phenolic hydroxyl groups on G-TA and primary amine groups on Si–NH₂, SiO₂ was uniformly loaded to the surface of graphene. Due to the synergistic dispersion effect of graphene and SiO₂, which prevents restacking and re-aggregating of both graphene and SiO₂, HGS hybrids were distributed evenly in the natural rubber (NR) matrix (HGS@NR). Simultaneously, the surface roughness of graphene after loading SiO₂ and the interfacial interaction between the HGS hybrid and NR matrix were substantially improved. Due to the good dispersion and strong interface, the overall properties of HGS@NR nanocomposites are drastically enhanced compared with those of GS@NR nanocomposites prepared by dispersing the blend of unmodified graphene and SiO₂ (GS) in NR. The HGS@NR nanocomposites possess the highest tensile strength up to 27.8 MPa at 0.5 wt% and tear strength of 60.2 MPa at 0.5 wt%. Thermal conductivities of the HGS@NR nanocomposites were found to be 1.5-fold better than that of the GS@NR nanocomposites. Also, the HGS@NR nanocomposites exhibit excellent abrasive resistant capacity that is nearly 2-fold better than that of the GS@NR nanocomposites. These results suggest that HGS has great potential in high-performance nanocomposites and a new strategy of constructing the efficient graphene–SiO₂ hybrid fillers has been established.

A novel graphene–silicon dioxide hybrid (HGS) was prepared by plant polyphenol-tannic acid (TA) functionalized pristine graphene (G-TA) and primary amine-containing silane coupling agent modified SiO₂ (Si–NH₂).