Cis‐bifenthrin induces immunotoxicity in adolescent male C57BL/6 mice

Bifenthrin (BF) is an important synthetic pyrethroid. Previous studies have demonstrated that cis‐BF exhibits toxic effects on development, the neurological, reproductive and endocrine system. In this study, we evaluated the immunotoxicity caused by cis‐BF in adolescent male C57BL/6 mice. Mice were exposed orally to 0, 5, 10, and 20 mg/kg/d for 3 weeks. The results showed that body weight, spleen weight, and splenic cellularity decreased in mice exposed to 20 mg/kg/d cis‐BF. Additionally, we found that the mRNA levels of the pro‐inflammatory factors IL‐1β, IL‐6, CXCL‐1, and TNF‐α, in peritoneal macrophages, the spleen, and the thymus were inhibited in the cis‐BF‐treated groups. Moreover, MTT assays demonstrated that cis‐BF inhibited splenocyte proliferation stimulated by LPS or Con A, as well as the secretion of IFN‐γ on Con A stimulation. Collectively, the results of this study suggest that exposure to cis‐BF has the potential to induce immunotoxicity in adolescent male C57BL/6 mice.     

Diverticulosis coli: update on a "Western" disease

Diverticular disease affects upwards of 50% of the population over the age of 60 years in Western countries and is becoming more common as the population ages. Studies from the 1970s and 1980s related its occurrence to the use of low-fiber diets and to the prolonged colonic transit time and increased intraluminal pressure associated with low-volume stools. Pulsion diverticula (pseudodiverticula) emerge through the thickened circular layer of the muscularis propria of the left colon at points of penetration of the vasa recta that supply the submucosa and mucosa. Complications of diverticular disease such as hemorrhage, diverticulitis, peridiverticular abscess, fistula, and perforation are well recognized. More recently, attention has been drawn to the polypoid prolapsing mucosal folds that may develop as the affected segment of bowel (usually the sigmoid) becomes shorter and to changes in the mucosa surrounding the diverticula and in the bowel wall that may result in confusion with ulcerative colitis or Crohn disease (sigmoid colitis-associated diverticulosis [SCAD]). Distinguishing SCAD from these entities is extremely important, and pathologists should be aware of the possibility of overdiagnosing chronic inflammatory bowel disease in biopsies or resection specimens of sigmoid colon with diverticular disease.     

穗港两地甲型肝炎病毒抗体的流行病学调查

目的：调查目前穗港两地甲型肝炎病毒（HAV）的人群中的感染状况,为预防策略提供依据。方法：的穗港两地区收集社区中不同年龄的健康人群的血清标本,应用酶联免疫法（EIA）检测标本中的HAV的总抗体,统计出不同年龄人群中的感染率。结果：广州地区甲型肝炎总阳性率为57.2%,年龄别标准化阳性率为64.9%,香港地区总阳性率为60.6%,年龄别标准化阳性率为42.6%,广州地区阳性率高于较香港地区阳性率;的香港地区30岁以下人群阳性率低,仅为15.0%,30岁以上人群阳性率为80.9%,广州地区20岁以下人群阳性率为41.4%,年龄大于20岁的人群抗体阳性率为72.7%,广州地区20岁以上人群甲型肝炎病毒抗体阳性率与香港地区30岁以上人群阳性率相似,广州地区1997年人群抗体阳性率与1989年人群抗体阳性率比较无明显差异。结论：穗港两地比较年龄别标准化阳性率广州地区高于香港地区,随着生活水平的提高甲型肝炎的感染的年龄有向后推移的趋势,香港地区30岁以下人群及广州地区20岁以下人群（特别是年龄小于10岁的儿童）是甲肝疫苗接种的适合人群,广州地区甲型肝炎抗体阳性率与1989年比较无明显差异。     

丁苯酞联合阿替普酶治疗急性脑梗死的疗效观察

目的探讨丁苯酞氯化钠注射液联合注射用阿替普酶治疗急性脑梗死的临床效果。方法选取2015年8月—2017年5月在武汉市武昌医院进行治疗的急性脑梗死患者72例为研究对象,将患者随机分为对照组和治疗组,每组各36例。对照组在脑部血栓内给予注射用阿替普酶,0.3 mg/kg,总量不超过20 mg。治疗组在对照组的基础上静脉注射丁苯酞氯化钠注射液,25 mg/次,2次/d。两组均连续治疗14 d。观察两组的临床疗效,比较两组的美国国立卫生研究院卒中量表(NIHSS)评分、Barthel指数量表(BI)评分、改良Rankin评分量表(m RS)评分和预后情况。结果治疗后,对照组和治疗组的总有效率分别为77.80%、94.40%,两组比较差异有统计学意义(P0.05)。治疗7、14 d后,两组NIHSS评分明显降低,同组治疗前后比较差异有统计学意义(P0.05);且治疗组NIHSS评分明显低于同期对照组,两组比较差异具有统计学意义(P0.05)。治疗后30 d,对照组和治疗组BI评分优良率分别44.4%、69.4%,两组比较差异具有统计学意义(P0.05);治疗后90 d,对照组和治疗组m RS评分良好率分别为50.0%、75.0%,两组比较差异有统计学意义(P0.05)。治疗后90 d,对照组和治疗组再发脑梗死率分别为33.3%、8.3%,对照组和治疗组再发脑出血率分别为25.0%、5.6%,两组比较差异有统计学意义(P0.05)。结论丁苯酞氯化钠注射液联合注射用阿替普酶治疗急性脑梗死具有较好的临床疗效,能改善神经功能,提高生活质量,减少再出血率、再梗死率,具有一定的临床推广应用价值。     

640层螺旋CT冠脉成像对心肌桥-壁冠状动脉的形态学量化评价及粥样硬化相关性分析

目的 利用640层螺旋CT冠状动脉成像对心肌桥-壁冠状动脉（MB-MCA）的形态学特征行定量分析,并探讨其与粥样硬化的关系。 方法 收集行冠状动脉成像的186例疑似冠心病患者的影像资料进行分析,若MB-MCA的诊断成立,描述MB-MCA的分布和分型,并在心脏收缩期和舒张期分别记录位于左前降支2段（LAD2）的MB-MCA的厚度以及血管直径,计算其在收缩期及舒张期的变化情况;同时分析MB-MCA粥样斑块情况。 结果 186例患者中56例（70段）存在MB-MCA,其中48段（68.6%）位于LAD2;70段MB-MCA中浅表型有44段（62.9%）,深厚型有26段（37.1%）。位于LAD2的MB-MCA厚度和直径在心脏收缩期和舒张期差异均有明显变化,差异具有统计学意义（t=2.84、3.38,P均 < 0.05）;43段位于LAD2的纳入分析的MB-MCA中有28段（65.1%）为Ⅱ级狭窄。70段MB-MCA中共48段（68.6%）存在粥样斑块,其中近侧者42段（87.5%）,明显高于远侧者6段（12.5%）,两者之间的差异有统计学意义（t=3.12,P < 0.05）。 结论 640层螺旋CT不仅能直接显示MB-MCA的存在,同时能对其形态特点、伴随心动周期动态变化情况行量化分析,具有较高的临床价值。     

低磷食物对模拟失重小鼠后肢骨骨质丢失防治作用的探讨

目的 初步探讨低磷食物对模拟失重下小鼠骨丢失防治的可能性及防治效果,为后期可能的临床应用提供实验依据.方法 利用尾部悬吊法模拟失重.将24只C57BL/6雌性小鼠随机分为四组,即对照(CON)组、对照低磷(CON-LP)组、悬尾(SUS)组及悬尾低磷(SUS-LP)组,每组6只.4周实验期满后取小鼠后肢骨标本,通过Micro-CT扫描分析比较各组小鼠股骨的骨体积分数(bone volume frac-tion,BV/TV)、骨小梁密度(trabecular density,Tb.Density)等骨密度参数,骨小梁厚度(trabecular thickness,Tb.Th)、平均骨小梁数(trabecular number,Tb.N)等骨形态学参数.通过抗酒石酸酸性磷酸酶(tartrate-resistant acid phosphatase,TRAP)染色、碱性磷酸酶(alkaline phosphatase,ALP)染色和丽春红三色(Ponceau S)染色对各组小鼠胫骨生长发育和改建情况进行组织形态学观察.结果 Micro-CT结果显示,CON-LP组与CON组比较:骨密度参数BV/TV和Tb.Density减小(P<0.05),形态学参数Tb.Th增高和Tb.N减少(P<0.05).SUS-LP组与SUS组比较:骨密度参数BV/TV和Tb.Density减小(P<0.05),形态学参数Tb.Th和Tb.N减少(P<0.05).染色结果显示:悬尾的小鼠(SUS组、SUS-LP组)与地面的小鼠(CON组、CON-LP组)比较,骨小梁出现明显的骨吸收,Tb.N减少、骨小梁间距变大.CON-LP组与CON组比较,Tb.Density减低、Tb.N减少.SUS-LP组与SUS组比较,骨小梁变细、Tb.N减少.结论 低磷食物对模拟失重下小鼠后肢骨骨丢失防治效果不明显,甚至可能产生不利的后果.     

Facile One Pot Polycondensation Method to Synthesize the Crosslinked Polyethylene glycol‐Based Copolymer Electrolytes

Comb‐like polyethylene glycol (PEG)‐based copolymer electrolytes with given crosslinking density are synthesized using PEG as the main chain segments (denoted as MC‐PEG), methoxy polyethylene glycol (MPEG) as side chain segments (denoted as SC‐PEG), and hexamethylene‐1,6‐diisocyanate homopolymer (HDI trimer) as bridging and/or crosslinking agent. In this study, the effects of molecular weight of MC‐PEG and SC‐PEG on Li ion conductivities of the copolymer have been examined. If MC‐PEG and/or SC‐PEG do not crystallize, the ion conductivities of graft copolymer electrolyte increase with either decreasing MC‐PEG or increasing SC‐PEG segment length. The highest ion conductivity of the copolymer electrolyte at room temperature reaches up to 7.7 × 10^?4 S cm^?1 when the molecular weight of MC‐PEG is 400 g mol^?1 and SC‐PEG is 1000 g mol^?1 (denoted as GC400‐1000). However, when the MC‐PEG and/or SC‐PEG segments begin to crystallize (i.e., GC400‐2000), where the flexibility of the related PEG molecular chains is largely reduced, the ion conductivity drops by almost two orders comparing to that of GC400‐1000 copolymer electrolyte. Meanwhile, crosslinked GC400‐1000 electrolyte has good thermal and electrochemical stability as well as high mechanical properties, making it suitable for commercial applications in Li ion secondary batteries.

     

Access Scheme for Controlling Mobile Agents and its Application to Share Medical Information

This study is showing the advantage of mobile agents to conquer heterogeneous system environments and contribute to a virtual integrated sharing system. Mobile agents will collect medical information from each medical institution as a method to achieve the medical purpose of data sharing. Besides, this research also provides an access control and key management mechanism by adopting Public key cryptography and Lagrange interpolation. The safety analysis of the system is based on a network attacker’s perspective. The achievement of this study tries to improve the medical quality, prevent wasting medical resources and make medical resources access to appropriate configuration.     

VEGF、NGF在上皮性卵巢癌中的表达及意义

目的探究血管内皮生长因子(VEGF)、神经生长因子(NGF)在上皮性卵巢癌(EOC)中的表达及意义。方法选取60例EOC患者的卵巢癌组织标本为观察组,选取同期获得的38例良性卵巢肿瘤组织标本为对照组,比较2组患者VEGF、NGF的表达情况以及观察组患者VEGF、NGF的表达情况与临床病理学特征的关系。结果观察组VEGF和NGF的表达均高于对照组(P<0.01)。卵巢癌组织中VEGF的表达与病理分期、淋巴结转移有关(P<0.01),与病理分型、病理分级无关(P>0.05);卵巢癌组织中NGF的表达与病理分型、病理分期、病理分级有关(P<0.05或<0.01),与淋巴结转移无关(P>0.05)。结论VEGF、NGF的表达与上皮性卵巢癌临床病理学特征有关,且有助于EOC的诊断,值得临床推广应用。