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自然灾害的隐形杀手

环球科学 2024年第12期 34-35页

作者：苏珊·基弗郑洁非(译) 不详

龙卷风空中的疾病龙卷风的致命袭击主要是强风卷起物体击中人体,造成钝力创伤致死。但这些飞来之物也会携带传染病。2011年,一个直径1.1千米的龙卷风侵袭了密苏里州乔普林市。这场龙卷风强度达到EF5级(龙卷风强度的最高级别),风速超过... 详细信息

龙卷风空中的疾病龙卷风的致命袭击主要是强风卷起物体击中人体,造成钝力创伤致死。但这些飞来之物也会携带传染病。2011年,一个直径1.1千米的龙卷风侵袭了密苏里州乔普林市。这场龙卷风强度达到EF5级(龙卷风强度的最高级别),风速超过每小时318.65千米,造成158人死亡、逾千人受伤。此外还有十余人因皮肤接触了狂风卷起的土壤而感染毛霉菌病。

关键词：龙卷风密苏里州隐形杀手自然灾害强风传染病风速

Recent advances in the understanding of the molecular mechanisms regulating platelet integrin αIIbβ3 activation

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Protein & Cell 2010年第7期1卷 627-637页

作者： Lanlan Tao Yue Zhang Xiaodong Xi Nelly kieffer Sino-French Research Center for Life Sciences and Genomics(CNRS/LIA-124) Ruijin HospitalShanghai Jiaotong University School of MedicineShanghai 200025China State Key Laboratory of Medical Genomics and Shanghai Institute of Hematology Ruijin HospitalShanghai Jiaotong University School of MedicineShanghai 200025China

Integrins are allosteric cell adhesion receptors that cycle from a low to a high affinity ligand binding state,a complex process of receptor activation that is of particular importance in blood cells such as platelets or *** we highlight recent progress in the understanding of the molecular pathways that regulate integrin activation in platelets and leukocytes,with a special focus on the structural changes in platelet integrinαIIbβ3 brought about by key intracellular proteins,namely talin and kindlins,that are of crucial importance in the regulation of integrin *** that the small GTPase Rap1 and its guanine exchange factor CalDAG-GEF1,together with RIAM,a Rap1GTP adaptor protein,promote the interaction of talin with the integrinβsubunit,has greatly contributed to fill the gap in our understanding of the signaling pathway from G-coupled agonist receptors and their phospholipase C-dependant second messengers,to integrin *** of patients with the rare blood cell disorder LAD-III have contributed to the identification of kindlins as new co-regulators of the talin-dependent integrin activation process in platelets and leukocytes,underlining the relevance for the in-depth investigation of patients with rare genetic blood cell disorders.

关键词： activation β3 rare

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XUV Spectroscopy of Subpicosecond Laser Produced Plasmas

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Chinese Physics Letters 1994年第9期11卷 554-557页

作者： JIANG Zhiming J.C.kieffer M.Chaker On leave from Shanghai Institute of Optics and Fine Mechanics Academia SinicaShanghai 201800 Institute National de la RecherchèScientifique INRS-énergie et matérauxC.P.1020VarennesQuebecCanada J3X 1S2

The keV and XUV spectra of plasmas produced by the interaction of a laser pulse of various duration and wavelengths with,a solid Al target are compared and *** decrease of the XUV emission from the high ionization states was observed with the shortest pulses(500fs)and the shortest wavelength(0.5μm),which may be due to rapid cooling and quenching of ultrashort-lived and initially ultra-dense plasmas.

关键词： ultrashort shortest picosecond

EFFECT OF MOLYBDENUM PROMOTER ON THE Cu-Co BASED CATALYSTS

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Journal of Energy Chemistry 1995年第1期 1-11页

作者： kieffer R.,KIENNEMANN A. Laboratuire de Chimie Organique Appliquee EHICS I rue Blaise Pascal 67008 Strasbourg France Laboratuire de Chimie Organique Appliquee EHICS I rue Blaise Pascal 67008 Strasbourg France

The synthesis of mixed alcohols (C1-C5) from syngas has been studied at 6. 0 MPa over modified Co/CuLaZr catalysts. The molybdenum addition enhanced greatly the activity and the selectivity to alcohols. The improvement of hydrogenation capacity of the system via a reversible spillover effect of hydrogen could explain this effect, together with a great capacity of CO insertion, illustrated by the effect of C2H4 addition as a probe to syngas. Under our experimental conditions, a mixed alcohol production of 147.1g/kg. cat/h containing a proportion of 33. 1% of higher alcohols (C2+OH) was obtained with a selectivity to ROH of 52. 8%.

关键词： syngas conversion alcohol synthesis copper-cobalt catalysts molybdenum promoter probe molecule tests

SYNGAS CONVERSION ON THE COPPER-COBALT CATALYSTS

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Journal of Energy Chemistry 1993年第3期 173-184页

作者： KIENNEMANN A. kieffer R. Laboratire de Chimie Organique Appliquce UA CNRS 469 EIIICS 1 rue Blaise Pascal Strasbourg France 67008 Laboratire de Chimie Organique Appliquce UA CNRS 469 EIIICS 1 rue Blaise Pascal Strasbourg France 67008

The CO + H2reaction was studied under a pressure or 6MPa overCo/CuLaZr catalysts prepared by impregnation method. The C2+OH formationincreased with the cobalt percentage, caused probably by the augmentation ofthe number of the Co-Cu bisites, and the C2+HC formation increased simulta-neously, explained by common reactional intermediates. It was indicated thatthere was an interaction between CuO and CoOxwithin the Co/CuLaZr cata-lyst. The results of C2H4addition to syngas show that the addition of Co ontoCuLaZr leads to an augmentation of CO insertion and a diminution of the hy-drogenation capacity of the system.

关键词： Cu Co SYNGAS CONVERSION ON THE COPPER-COBALT CATALYSTS Zr CO

Neurotransmitter systems in mouse airways

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中国药理学与毒理学杂志 2017年第10期31卷 1015-1016页

作者： Peter W ABEL Cameron M kieffer Ya-ping TU Department of Pharmacology Creighton University School of Medicine

OBJECTIVE The objective of this study was to characterize the neurotransmitter systems that cause constriction of murine *** Murine precision cut lung slices(PCLS)and trachea were prepared,placed into perfusion chambers equipped with platinum electrodes and stimulated transmurally(1.0 ms,50 V,0.1-30 Hz).To measure PCLS constriction,changes in airway luminal area in response to electric field stimulation(EFS)were captured as video images quantified using Image J *** trachea,changes in isometric tension were recorded using Grass force *** response curves were generated in the absence and the presence of the inhibitors magnesium,atropine and capsaicin and responses analyzed and compared using a student's t-test(P<0.05).RESULTS EFS caused airway constriction in a frequency-dependent manner that was best fit by a biphasic ***-specific stimulation was verified by Mg^(2+) *** airway constriction to 30 Hz EFS in PCLS was(51.8±3.0)%while tracheal constriction averaged(551±80)***,in PCLS the muscarinic receptor antagonist atropine(10μmol·L^(-1))blocked(99.5±7.2)%of EFS induced constriction at 1 Hz,but only blocked(23.3±3.8)%of EFS induced constriction at 30 Hz and eliminated the first phase but not the second phase of the biphasic EFS *** with capsaicin to deplete sensory neurotransmitters significantly increased EFS constriction supporting the presence of sensory neurotransmitter systems in *** These data are consistent with parasympathetic constriction of airways by acetylcholine at lower EFS frequencies while higher frequencies release sensory dilator *** data provide evidence for multiple nerve types innervating airways which may provide novel targets for treatment of lung disease.

关键词： airways nerve stimulation airway constriction atropine capsaicin

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Investigation of the integrin-dependent signaling pathway leading to proplatelet-like cell extensions in CHO cells

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Investigation of the integrin-dependent signaling pathway le...

Fatigue Response of Cold-Rolled Type-304 Stainless Steel Foil

第12届全国实验血液学会议

作者： Nelly kieffer Sino-French Research Center for Life Sciences and Genomics CNRS Unit 7212 and Ruijin Hospital Jiaotong University Medical School

＜正＞Backgroud:Platelet release from differentiated megakaryocytes is a microtubule-driven process leading to the formation of long megakaryocyte extensions,called proplatelets,from which mature platelets are cleaved *** neuronal cells,neurite outgrowth is also a microtubule driven mechanism,and recent data have provided evidence that

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Journal of Minerals and Materials Characterization and Engineering 2021年第1期9卷 90-99页

作者： Thomas P. kieffer James I. Hardy Micro-Measurements Vishay Precision Group Wendell USA

This study presents the fatigue response of 304 stainless steel foil, cold-rolled to a thickness of 3.2 μm with 87 percent cold work at orientations of 0, 45, and 90 degrees to the direction of rolling. Fatigue specimens were fabricated by laminating a supportive layer of 20-μm polyimide film to one side of the foil and patterning 242 crack initiation features by photolithographic process. Progression of fatigue damage was determined through electrical resistance measurement. The fatigue response was demonstrated to be largely affected by anisotropy existing between the rolling direction and the off-axis orientations. Fatigue cracks that traveled in a direction parallel to the elongated grains (cyclic loads applied at 90-degree orientation to foil rolling direction) had the most fatigue response (undesirable characteristic). The construction of the specimens with thin foil supported by a film backing contributed to high fatigue threshold.

关键词： Fatigue Cold-Rolled Foil Type-304 Stainless Steel Resistive-Sensing Anisotropy

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钼掺杂LaVO_4上丙烷氧化脱氢

物理化学学报 2002年第1期18卷 1-4页

作者：照日格图李文钊于春英徐恒泳 Roger kieffer 中国科学院大连化学物理研究所大连116023 LERCSI-ECPE(UMR7515duCNRS)

研究了钼掺杂LaVO4催化剂的丙烷氧化脱氢催化性能.加入钼对丙烷氧化脱氢反应有很好的助催化作用.当丙烷转化率恒定在10%和20%时,丙烯选择性在LaMo0.1V0.9O4.05上分别达到了56%和43%,而在LaVO4上仅为36%和22%,这归结为钼掺杂催化剂上有... 详细信息

研究了钼掺杂LaVO4催化剂的丙烷氧化脱氢催化性能.加入钼对丙烷氧化脱氢反应有很好的助催化作用.当丙烷转化率恒定在10%和20%时,丙烯选择性在LaMo0.1V0.9O4.05上分别达到了56%和43%,而在LaVO4上仅为36%和22%,这归结为钼掺杂催化剂上有利于丙烯生成的可活动氧物种的增加和催化剂氧化还原性的改变.

关键词：丙烷氧化脱氢稀土催化剂钼掺杂 LaVO4 丙烯醛钒醍镧

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