不同干燥工艺对鱼腥草挥发油的影响研究

目的研究不同干燥工艺对大别山鱼腥草挥发油的影响。方法分别用低温烘干(50℃)、晒干、阴干的干燥方式处理新鲜的鱼腥草,挥发油提取器提取挥发油,采用GC-MS检测分析。结果阴干、晒干、烘干鱼腥草中的挥发油分别鉴定出43、37和14种。结论晒干和低温烘干方式均会影响鱼腥草挥发油的组成,但对总体积影响不显著。     

Characterization of Bioeffects on Endothelial Cells under Acoustic Droplet Vaporization

Gas embolotherapy is achieved by locally vaporizing microdroplets through acoustic droplet vaporization, which results in bubbles that are large enough to occlude blood flow directed to tumors. Endothelial cells, lining blood vessels, can be affected by these vaporization events, resulting in cell injury and cell death. An idealized monolayer of endothelial cells was subjected to acoustic droplet vaporization using a 3.5-MHz transducer and dodecafluoropentane droplets. Treatments included insonation pressures that varied from 2 to 8 MPa (rarefactional) and pulse lengths that varied from 4 to 16 input cycles. The bubble cloud generated was directly dependent on pressure, but not on pulse length. Cellular damage increased with increasing bubble cloud size, but was limited to the bubble cloud area. These results suggest that vaporization near the endothelium may impact the vessel wall, an effect that could be either deleterious or beneficial depending on the intended overall therapeutic application.     

无创正压通气治疗重症急性心源性肺水肿临床研究

目的评价无创通气模式持续气道正压（cPAP）和双水平气道正压（BiPAP）通气在急性心源性肺水肿治疗中的作用。方法我院急诊科收治的60例严重急性心源性肺水肿，均合并酸中毒（pH〈7．35），随机分为3组，即常规吸氧组，CPAP组（10cmH2O）和BiPAP组（IPAP=15cmH2O，EPAP=5H2O）。后两者采用伟康医疗公司的S／T30型呼吸机通气。以院内2小时抢救成功率和幸存出院率评价治疗效果。结果抢救成功率（2小时治疗结束时呼吸频率〈23次／min，SaO2〉90％，动脉血pH〉7．35，酸中毒恢复）：对照组3例（15％），CPAP组7例（35％），BiPAP组9例（45％），P=0．116；幸存出院：对照组14例（70％），CPAP组20例（100％），BiPAP组15例（75％），P=0．029（采用Fisher＇s检验）。结论研究结果显示：急性心源性肺水肿合并酸中毒者，采用CPAP治疗幸存出院率更高，而不是BiPAP和常规吸氧组。院内生存率与早期生理变化间无相关。早期实施无创通气，使插管率降低。     

Hepatic portal venous gas

Differentiating hepatic portal venous gas (HPVG) and pneumobilia on the CT scan can be accomplished by comparing the pattern of intrahepatic air spread. HPVG can be an indicator of significant intra‐abdominal pathology and bowel ischaemia is the most common causative etiology for HPVG.     

戊二酸尿症-Ⅰ型三例诊断分析及文献复习

目的探讨戊二酸尿症1型的临床特征和诊断思路。方法对3例戊二酸尿症1型患儿的临床资料进行分析。结果3例患儿均表现为感染或惊厥后发育倒退,其中大头畸形一例,不明原因的硬膜下积液一例。结论戊二酸尿症1型临床表现无特异性,但感染或惊厥后发育倒退、大头畸形、不明原因的硬膜下积液时是其主要特征,尿有机酸分析是诊断的重要依据。     

白念珠菌生物被膜耐药株麦角甾醇检测的方法学研究

目的：分别采用高效液相色谱法和气相色谱质谱联用法测定白念珠菌麦角甾醇含量,并对这两种方法进行比较。方法：采用浓度梯度递增法诱导白念珠菌耐药株,采用KONT真菌显色MIC药敏系统鉴定耐药性。构建6、12、24h生物被膜,采用高效液相色谱法和气相色谱质谱联用法测定麦角甾醇含量。结果：高效液相色谱法检测出麦角甾醇含量,最低检出浓度为0.05mg/L,而气相色谱质谱联用法未检测出麦角甾醇含量。结论：高效液相色谱法能准确测定白念珠菌麦角甾醇含量。与气相色谱质谱联用法比较,高效液相色谱法简单、高效和可靠。     

An experimental study on investigating the postmortem interval in dichlorvos poisoned rats by GC/MS-based metabolomics

The estimation of the postmortem interval (PMI) is always a key issue in forensic science. Although many attempts based on metabolomics approaches have been proven to be feasible and accurate for PMI estimation, there have been no reports regarding the determination of the PMI in acute dichlorvos (DDVP) poisoning. In this study, all rats were killed by acute DDVP poisoning at a dose three fold the oral LD₅₀ (240 mg/kg). Gas chromatography-mass spectrometry (GC/MS) was applied to investigate the metabolic profiling of blood samples at various times after death up to 72 h. A total of 39 metabolites were found to be associated with PMI, and the combinations of various numbers of metabolites were used to establish support vector regression (SVR) models to investigate the PMI. The SVR model constructed by 23 metabolites had a minimum mean squared error (MSE) of 5.49 h for the training set. Then, the SVR model was validated by prediction set with an MSE of 10.33 h, suggesting good predictive ability of the model for investigating the PMI. The findings demonstrated the great potential of GC/MS-based metabolomics combined with the SVR model in determining the PMI of DDVP poisoned rats and provided an experimental basis for the application of this approach in investigating the PMI of other toxicants.     

Localization and signaling of the receptor protein tyrosine kinase Tyro3 in cortical and hippocampal neurons

Protein phosphorylation serves as a critical biochemical regulator of short-term and long-term synaptic plasticity. Receptor protein tyrosine kinases (RPTKs) including members of the trk, eph and erbB subfamilies have been shown to modulate signaling cascades that influence synaptic function in the central nervous system (CNS). Tyro3 is one of three RPTKs belonging to the "TAM" receptor family, which also includes Axl and Mer. Tyro3 is the most widely expressed of these receptors in the CNS. Despite recent advances suggesting roles for members of this receptor family in the reproductive and immune systems, their functions in the CNS remain largely unexplored. In an effort to elucidate the roles of Tyro3 and its ligand, the protein growth arrest-specific gene6 (Gas6) in the hippocampus and cortex, we performed a detailed study of the localization and signaling of Tyro3 polypeptides in rat hippocampal and cortical neurons. Tyro3 was readily detected in dendrites and in the soma where it was distributed in a punctate pattern. Tyro3 exhibited only a limited level of co-localization with postsynaptic density protein-95 (PSD-95), suggesting that while located within dendrites, it was not confined to the postsynaptic compartment. In addition, Tyro3 was also identified in the axons and growth cones of immature neurons. The prominent expression of Tyro3 in dendrites suggested that it may be capable of modulating signaling pathways triggered by synaptic transmission. We have provided evidence in support of this role by demonstrating that Gas6 induced the phosphorylation of Tyro3 in cortical neurons in vitro, resulting in the recruitment of the mitogen-activated protein kinase (MAPK) and the phosphoinositide-3 kinase (PI(3)K) signaling pathways. As these pathways play critical roles in the induction of hippocampal long-term potentiation (LTP), these findings suggest that Tyro3 signaling may influence synaptic plasticity in the dendritic compartment of hippocampal and cortical neurons.