丙泊酚对未成年肥胖模型大鼠认知功能损害的机制

目的 研究丙泊酚对未成年肥胖大鼠认知功能的影响,并探讨其与海马组织中血红素加氧酶1（HO-1）、超氧化物歧化酶1（SOD1）蛋白及血浆中S100钙结合蛋白β（S100β）表达的关系。方法 取3周龄雄性SD大鼠140只,随机分为基础饲料组（n=40）和高脂饲料组（n=100）。基础饲料组予基础饲料喂养,高脂饲料组予高脂饲料喂养。喂养4周后,取高脂饲料组体质量≥基础饲料组平均体质量+1.4倍标准差的40只大鼠判定为肥胖建模成功。将基础饲料组大鼠随机分为正常脂肪乳组（NL组）、正常丙泊酚组（NP组）,将建模成功的肥胖大鼠随机分为肥胖脂肪乳组（OL组）、肥胖丙泊酚组（OP组）,每组均为20只。丙泊酚组腹腔注射丙泊酚100 mg/kg,脂肪乳组（对照）腹腔注射脂肪乳100 mg/kg,每天注射1次,连续7 d。停药后第1天,各组大鼠行Morris水迷宫实验评估大鼠空间学习记忆能力,ELISA检测大鼠血浆S100β含量,蛋白质印迹法检测海马组织中HO-1、SOD1蛋白表达,H-E染色观察海马CA1区神经元的变化。结果 与OL组比较,OP组第1～5天逃逸潜伏期均延长（P均<0.05）,第三象限停留时间缩短（P<0.05）,穿越平台次数减少（P<0.05）,血浆中S100β蛋白表达升高（P<0.05）,海马组织中HO-1和SOD1蛋白相对表达量均降低（P均<0.05）,海马CA1区神经元数量减少（P<0.01）。与NL组比较,NP组第1、2天逃逸潜伏期均延长（P均<0.05）,上述其余指标差异均无统计学意义（P均>0.05）。结论 丙泊酚通过下调未成年肥胖大鼠海马组织中抗氧化因子HO-1和SOD1的表达使大鼠S100β表达和氧化应激增加,从而导致其认知功能损害。     

MFC/NFC-Based Foam/Aerogel for Production of Porous Materials: Preparation,Properties and Applications

Nanofibrillated cellulose and microfibrillated cellulose are potential raw materials separated from plant fibers with a high aspect ratio and excellent mechanical properties, which can be applied in various fields (packaging, medicine, etc.). They have unique advantages in the preparation of aerogels and foams, and have attracted widespread attention in recent years. Cellulose-based porous materials have good biodegradability and biocompatibility, while high porosity and high specific surface area endow them with strong mechanical properties and liquid retention performance, which can be used in wall construction, sewage treatment and other fields. At present, the preparation method of this material has been widely reported, however, due to various process problems, the actual production has not been realized. In this paper, we summarize the existing technical problems and main solutions; in the meantime, two stable systems and several drying processes are described, and the application potential of cellulose-based porous materials in the future is described, which provides a reference for subsequent research.     

Dielectric ceramics/TiO2/single-crystalline silicon nanomembrane heterostructure for high performance flexible thin-film transistors on plastic substrates

A dielectric ceramics/TiO₂/single-crystalline silicon nanomembrane (SiNM) heterostructure is designed and fabricated for high performance flexible thin-film transistors (TFTs). Both the dielectric ceramics (Nb₂O₃–Bi₂O₃–MgO) and TiO₂ are deposited by radio frequency (RF) magnetron sputtering at room temperature, which is compatible with flexible plastic substrates. And the single-crystalline SiNM is transferred and attached to the dielectric ceramics/TiO₂ layers to form the heterostructure. The experimental results demonstrate that the room temperature processed heterostructure has high quality because: (1) the Nb₂O₃–Bi₂O₃–MgO/TiO₂ heterostructure has a high dielectric constant (∼76.6) and low leakage current. (2) The TiO₂/single-crystalline SiNM structure has a relatively low interface trap density. (3) The band gap of the Nb₂O₃–Bi₂O₃–MgO/TiO₂ heterostructure is wider than TiO₂, which increases the conduction band offset between Si and TiO₂, lowering the leakage current. Flexible TFTs have been fabricated with the Nb₂O₃–Bi₂O₃–MgO/TiO₂/SiNM heterostructure on plastic substrates and show a current on/off ratio over 10⁴, threshold voltage of ∼1.2 V, subthreshold swing (SS) as low as ∼0.2 V dec⁻¹, and interface trap density of ∼10¹² eV⁻¹ cm⁻². The results indicate that the dielectric ceramics/TiO₂/SiNM heterostructure has great potential for high performance TFTs.

Dielectric ceramics/TiO2/single-crystalline silicon nanomembrane heterostructure for high performance flexible thin-film transistors.     

An In Vivo Rat Model of Artery Buckling for Studying Wall Remodeling

Theoretical modeling and in vitro experiments have demonstrated that arterial buckling is a possible mechanism for the development of artery tortuosity. However, there has been no report of whether artery buckling develops into tortuosity, partially due to the lack of in vivo models for long-term studies. The objective of this study was to establish an in vivo buckling model in rat carotid arteries for studying arterial wall remodeling after buckling. Rat left carotid arteries were transplanted to the right carotid arteries to generate buckling under in vivo pressure and were maintained for 1 week to examine wall remodeling and adaptation. Our results showed that a significant buckling was achieved in the carotid arterial grafts with altered wall stress. Cell proliferation and matrix metalloprotinease-2 (MMP-2) expression in the buckled arteries increased significantly compared with the controls. The tortuosity level of the grafts also slightly increased 1 week post-surgery, while there was no change in vessel dimensions, blood pressure, and blood flow velocity. The artery buckling model provides a useful tool for further study of the adaptation of arteries into tortuous shapes.