检索结果-南通市图书馆

Optimization of operation conditions for extracting lithium ions from calcium chloride-type oil field brine

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2012年第4期19卷 290-294页

作者： Hong-jun Yang qing-hai Li Bing Li feng-qin guo qing-fen Meng Wu Li qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining 810008 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China Fundamental Department Qinghai University Xining 81 O016 China

AI（OH）3 was prepared to extract lithium ions from calcium chloride-type oil field brine. The influences of four factors, namely temperature, Al3＋/Li＋ molar ratio, OH-/Al3＋ molar ratio, and contact time between AI（OH）3 and the brine, on the yield of lithium ions were investigated. It is found that their optimal values are 35℃, 4.5, 2.6, and 6 h, respectively. In the course of the experiment, the apparent pH value was observed. The results reveal that the apparent pH value has no remarkable influence on the yield of lithium ions. Meanwhile, the effects of the concentrations of calcium ions and magnesium ions in the brine on lithium recovery were studied. The results indicate that cal- cium ions have minor negative influence on the yield of lithium ions under optimal conditions, and magnesium ions slightly influence the yield of lithium ions.

关键词： lithium extraction oil field brine aluminium hydroxide

Synthesis of Mg_2B_2O_5 whiskers via coprecipitation and sintering process

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2012年第10期19卷 969-972页

作者： Dong-hai Zhu Xue-ying Nai Cheng-cai Zhu feng-qin guo Shao-ju Bian Wu Li qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining 810008 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Department o f Basin Education Qinghai University Xining 810016 China

Mg2B2O5 whiskers with high aspect ratio were synthesized by coprecipitation and sintering process using MgCl2-6H2O, H3BO3, and NaOH as raw materials and KCl as a flux. Their formation process was investigated by thermogravimetry and differential scanning calo- rimetry （TG-DSC）, X-ray diffraction （XRD）, and scanning electron microcopy （SEM）. It is found that the products synthesized at 832℃ are monoclinic Mg2B205 whiskers with a diameter of 200-400 nm and a length of 50-80 μm. Transmission electron microscopy （TEM） and selected area electron diffraction （SAED） analyses show that the whiskers obtained at 832℃ are single crystalline and grow along with the [010] direction. The growth mechanism of Mg2B2O5 whiskers was also presented.

关键词： magnesium borate coprecipitation sintering crystal whiskers crystal growth microstructure

鼻内窥镜术后Medtronic海绵填塞术腔的效果观察

在线全文

学校读者我要写书评

暂无评论

中国组织工程研究与临床康复 2007年第22期11卷 4428-4429页

作者：曾立刚冯国琴华中科技大学同济医学院附属襄樊医院耳鼻咽喉科湖北省襄樊市441021

为了解Medtronic海绵在鼻内镜鼻窦手术后填塞术腔的效果,选择华中科技大学同济医学院附属襄樊医院耳鼻咽喉科2004-06/12收治的鼻内窥镜术后患者76例,随机分为Medtronic海绵组36例和凡士林纱条组40例,分别采用Medtronic海绵或凡士林纱条... 详细信息

为了解Medtronic海绵在鼻内镜鼻窦手术后填塞术腔的效果,选择华中科技大学同济医学院附属襄樊医院耳鼻咽喉科2004-06/12收治的鼻内窥镜术后患者76例,随机分为Medtronic海绵组36例和凡士林纱条组40例,分别采用Medtronic海绵或凡士林纱条填塞术腔,观察两组患者术后鼻部胀痛及止血效果情况。结果发现Medtronic海绵组术后胀痛发生率明显低于凡士林纱条组(P<0.01),Medtronic海绵组取出填塞物时出血发生率明显也低于凡士林纱条组(P<0.01)。说明了Medtronic海绵用于鼻内窥镜术后术腔填塞效果明显优于凡士林纱条,有利于鼻内窥镜术后患者的恢复。

关键词： Medtronic海绵凡士林纱条鼻内窥镜鼻腔填塞

个体化预测非小细胞肺癌患者化疗期间肺部感染风险Nomogram模型的建立与验证

在线全文

学校读者我要写书评

暂无评论

中国感染控制杂志 2022年第2期21卷 171-179页

作者：张俐丽冯国琴泰州市人民医院呼吸与危重症医学科江苏泰州225300 泰州市人民医院护理部江苏泰州225300

目的构建个体化预测非小细胞肺癌(NSCLC)患者化学治疗(化疗)期间发生肺部感染的风险Nomogram模型,并对模型的预测效能进行验证。方法选取2018年2月—2021年1月在某院进行治疗的218例NSCLC患者作为研究对象,根据化疗后是否发生肺部感染... 详细信息

目的构建个体化预测非小细胞肺癌(NSCLC)患者化学治疗(化疗)期间发生肺部感染的风险Nomogram模型,并对模型的预测效能进行验证。方法选取2018年2月—2021年1月在某院进行治疗的218例NSCLC患者作为研究对象,根据化疗后是否发生肺部感染将其分为肺部感染组(n=56)和非肺部感染组(n=162),采用LASSO和logistic回归分析筛选NSCLC患者化疗期间发生肺部感染的独立危险因素,并构建Nomogram预测模型。结果纳入218例NSCLC患者,56例化疗期间发生肺部感,感染发病率为25.69%。LASSO和logistic回归分析结果显示:年龄≥60岁、糖尿病、联合化疗药物、化疗周期>2次、化疗后清蛋白含量<30 g/L、化疗前KPS评分<80分是NSCLC患者化疗期间发生肺部感染的独立预测因素(均P<0.05)。基于6项独立预测因素建立预测NSCLC患者化疗期间发生肺部感染的风险Nomogram模型,验证结果显示,训练集和验证集的C-index分别为0.819(95%CI:0.788~0.850)、0.802(95%CI:0.778~0.829),两集校准曲线走向与对角线(理想曲线)较为贴近,受试者工作特征曲线下面积分别为0.807(95%CI:0.775~0.839)、0.797(95%CI:0.773~0.821),决策曲线显示阈值概率在1%~90%时,有较高的净获益值。结论基于NSCLC患者化疗期间发生肺部感染独立预测因素建立的Nomogram模型,具有较好的预测效能,有助于临床及早筛查高风险患者和进一步改进治疗计划。

关键词：非小细胞肺癌肺部感染预测 Nomogram模型预测因素

Studies on Stimulating Effect of Two Selective Insecticides on the Numbers of Laid Egg by Yellow Rice Borer,Tryporyza incertulas(Walker)and Their Effects on Biochemistry of Rice Plants

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2003年第10期2卷 1121-1129页

作者： WU Jin-cai, WANG Ai-hua, XU Jun-feng, YANG guo-qin, QIU Hui-min and LI Dong-hu (Department of Plant Protection, Agricultural College, Yangzhou University, Yangzhou 225009, P.R.China ) Department of Plant Protection Agricultural College Yangzhou University Yangzhou 225009 P. R. China

Buprofezin and imidacloprid are selective insecticides against Homoptera insects. This paper investigated stimulating effect of the two insecticides on the number of laid eggs by yellow rice borer, Tryporyza incertulas(Walker) of three generations in 20012002. The results showed that the reproductive rate of emergence months during the larvae feeding on the rice plants of Xiushui63 treated with the two insecticides was significantly higher than that of control, indicating that the numbers of laid eggs by the borer was stimulated following buprofezin and imidacloprid applications. However, there was no such effect for the larvae feeding on rice variety Zhendao2 which showed moderate resistance to the insect. In addition, the incidence of stimulating egg laid for the first instar treated with the two insecticides was greater than that for the third instar. Biochemical tests showed that oxalic acid concentration declined, and photosynthetic rate of rice leaves following the two insecticide applications declined significantly compared to control, whereas reducing sugar concentration increased significantly for all other treatments of two varieties except Xiushui63 treated with buprofezin. The level of glutathione-S-transferase varied with rice variety and insecticide.

关键词： Buprofezin Imidacloprid Tryporyza incertulas Egg laid Stimulating effect Biochemical mechanism

Prediction of traumatic avascular necrosis of the femoral head by single photon emission computerized tomography and computerized tomography： an experimental study in dogs

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Traumatology 2011年第4期14卷 227-232页

作者： SHEN feng YAN Zuo-qin guo Chang-an SHI Hong-cheng GU Yu-shen ZENG Meng-su LU Xiao-yu LIU Jun Department of Orthopaedics Zhongshan Hospital ofFudan University Shanghai 200032 China

Objective： To evaluate the femoral head perfusion and to predict the traumatic avascular necrosis （AVN） of the femoral head by single photon emission computerized tomography and computerized tomography （SPECT/CT）. Methods： Totally 18 adult beagle dogs were divided randomly into three equal-sized （n=6） groups. Subsequently different degrees of ischemia model were developed by de- stroying blood vessels of the femoral head. The left hip received sham operation as normal control and the right hip underwent blood interruption. In Group A, the ligamentum teres was cut off. In Group B, the marrow cavity of the right femoral neck was destroyed while in Group C, the soft tis- sues at the base of the femoral neck were stripped in addition to the resection of the ligamentum teres and destruction of the marrow cavity. Three hours after surgery, SPECT/ CT was performed. Laser Doppler Flowmetry （LDF） measurements were also obtained at three different time points （before operation, immediately and three hours after operation） in order to assess the change process of blood supply to the femoral head. Results： SPECT/CT showed no significant difference in the radionuclide uptake between the right and left femo- ral heads in Group A （t=-0.09,P=-0.94） and Group B （t= 0.52, P=0.62）. However, in Group C, it was 261±62 for the right femoral head, only 12% of that in the left femoral head. LDF measurements indicated that the femoral head perfusion was decreased from （45.0±3.3） PU to （39.1±3.7） PU in Group A, from （44.0±2.7） PU to （34.3±2.6） PU in Group B, and from （47.3±2.1） PU to （4.96±0.6） PU in Group C immediately after operation. However, the perfusion was restored and returned to normal values three hours after operation except in Group C. Conclusion： SPECT/CT could assess the perfusion of the femoral head semiquantitatively, which might be useful in predicting the development of traumatic AVN.

关键词： Femur head necrosis Femoral head Tomography, emission-computed, single-photon Tomography, X-ray computed Magnetic resonance imaging

Induced neural stem cells regulate microglial activation through Akt-mediated upregulation of CXCR4 and Crry in a mouse model of closed head injury

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第5期20卷 1416-1430页

作者： Mou Gao qin Dong Dan Zou Zhijun Yang Lili guo Ruxiang Xu Department of Neurosurgery Sichuan Academy of Medical Sciences and Sichuan Provincial People’s HospitalSchool of MedicineUniversity of Electronic Science and Technology of ChinaChengduSichuan ProvinceChina Department of Neurosurgery Chinese PLA General HospitalBeijingChina Department of Neurology Fu Xing HospitalCapital Medical UniversityBeijingChina

Microglial activation that occurs rapidly after closed head injury may play important and complex roles in neuroinflammation-associated neuronal damage and *** previously reported that induced neural stem cells can modulate the behavior of activated microglia via CXCL12/CXCR4 signaling,influencing their activation such that they can promote neurological ***,the mechanism of CXCR4 upregulation in induced neural stem cells remains *** this study,we found that nuclear factor-κB activation induced by closed head injury mouse serum in microglia promoted CXCL12 and tumor necrosis factor-αexpression but suppressed insulin-like growth factor-1 ***,recombinant complement receptor 2-conjugated Crry(CR2-Crry)reduced the effects of closed head injury mouse serum-induced nuclear factor-κB activation in microglia and the levels of activated microglia,CXCL12,and tumor necrosis factor-α.Additionally,we observed that,in response to stimulation(including stimulation by CXCL12 secreted by activated microglia),CXCR4 and Crry levels can be upregulated in induced neural stem cells via the interplay among CXCL12/CXCR4,Crry,and Akt signaling to modulate microglial *** agreement with these in vitro experimental results,we found that Akt activation enhanced the immunoregulatory effects of induced neural stem cell grafts on microglial activation,leading to the promotion of neurological recovery via insulin-like growth factor-1 secretion and the neuroprotective effects of induced neural stem cell grafts through CXCR4 and Crry upregulation in the injured cortices of closed head injury ***,these beneficial effects of Akt activation in induced neural stem cells were positively correlated with the therapeutic effects of induced neural stem cells on neuronal injury,cerebral edema,and neurological disorders post–closed head *** conclusion,our findings reveal that Akt activation may enhance the immunoregulatory effects of induced neura

关键词： Akt signaling cerebral edema closed head injury Crry CXCR4 induced neural stem cell microglia neuroinflammation

在线全文

学校读者我要写书评

暂无评论

透过“三鹿奶粉事件”看企业社会责任

特区经济 2009年第7期246卷 278-280页

作者：冯雪芹郭慰慰泰山学院政法系山东泰安271000

奶粉是食品企业特殊的生产行业,直接影响着消费者的身体健康和生命安全,甚至在一定程度上影响到社会的稳定。企业是食品安全的责任人,对消费者要承担起社会责任。本文分析了食品企业社会责任缺失的原因,并提出了相应的政策建议。

关键词：三鹿奶粉事件食品安全企业社会责任

Clinical effects of phospholipase D2 in attenuating acute pancreatitis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2025年第2期31卷 52-60页

作者： Jin-Wei Niu guo-Chao Zhang Wu Ning Hai-Bin Liu Hua Yang Chao-feng Li Department of General Surgery China-Japan Friendship HospitalBeijing 100029China

BACKGROUND The objective of the current study was to elucidate the clinical mechanism through which phospholipase D2(PLD2)exerted a regulatory effect on neutrophil migra-tion,thereby alleviating the progression of acute *** To elucidate the clinical mechanism through which PLD2 exerted a regulatory effect on neutrophil migration,thereby alleviating the progression of acute *** The study involved 90 patients diagnosed with acute pancreatitis,admitted to our hospital between March 2020 and November 2022.A retrospective analysis was conducted,categorizing patients based on Ranson score severity into mild(n=25),moderate(n=30),and severe(n=35)*** data was collected for each *** blot analysis assessed PLD2 protein expression in patient ***-time reverse transcription polymerase chain reaction was used to evaluate the mRNA expression of chemokine receptors associated with neutrophil *** levels of inflammatory factors in patients were detected using enzyme-linked immunosorbent *** migration tests were conducted to compare migration of neutrophils across groups and analyze the influence of PLD2 on neutrophil *** Overall data analysis did not find significant differences between patient groups(P>0.05).The expression of PLD2 protein in the severe group was lower than that in the moderate and mild groups(P<0.05).The expression level of PLD2 in the moderate group was also lower than that in the mild group(P<0.05).The severity of acute pancreatitis is negatively correlated with PLD2 expression(r=-0.75,P=0.002).The mRNA levels of C-X-C chemokine receptor type 1,C-X-C chemokine receptor type 2,C-C chemokine receptor type 2,and C-C chemokine receptor type 5 in the severe group are significantly higher than those in the moderate and mild groups(P<0.05),and the expression levels in the moderate group are also higher than those in the mild group(P<0.05).The levels of C-reactive protein,tumo

关键词： Phospholipase D2 Neutrophil migration Acute pancreatitis Retrospective analysis Inflammatory response