难治性胃食管反流病临证研究

难治性胃食管反流病是临床疑难病,症状反复,缠绵难愈,治疗棘手。中医药治疗“反酸”“吞酸”证历久源远,充分挖掘古籍,深研病机,提炼治法,发挥中医药特色,对治疗本病意义深远。     

氟哌啶醇季铵盐衍生物的合成及其对冠状动脉的作用

目的 :合成氟哌啶醇季铵盐衍生物并研究其对动物冠状动脉的作用。方法 :以氟哌啶醇为原料 ,将其与卤代烃在回流的情况下进行反应而得到其季铵盐衍生物。采用猪冠状动脉条生物测定法和Langendorff灌流法研究这些衍生物对冠状动脉的作用。结果 :合成了 7个新化合物 ( 1～ 7) ,其中化合物 7量效依赖地压低KCl所致的猪冠状动脉条收缩曲线 ,阻断较大剂量所致的冠状动脉条痉挛 ,并量效依赖地拮抗脑垂体后叶素所致的离体豚鼠心脏冠脉流量减少。结论 :化合物 7显示了良好的扩张冠状动脉的作用 ,值得进一步研究     

Surface modification of titanium by etching in concentrated sulfuric acid

OBJECTIVE: The purpose of this study was to characterize the etching behavior of titanium in concentrated sulfuric acid and discuss its application on surface modification of titanium for biological use. METHODS: Commercially pure titanium (cpTi) plate was etched in 48% H2SO4 at RT -90 degrees C for 0.25-8 h. The weight loss was derived from the weight differences before and after etching. The surfaces after etching were characterized by surface roughness, X-ray diffractometry, and scannning electron spectroscopy. The apparent activation energy of the dissolution of cpTi into acid was derived from an Arrhenius plot of the rate of weight loss versus the acid temperature. RESULTS: The surface roughness of cpTi increased with the acid temperature and etching time. The surface roughness was strongly related to the weight loss. The weight loss increased drastically with the acid temperature after an initial period, which shortened with increasing acid temperature. The apparent activation energy for the dissolution of cpTi in H2SO4 was derived as 67.8 kJ/mol. SIGNIFICANCE: This study indicates that etching with concentrated sulfuric acid is an effective way to modify the surface of titanium for biological applications.     

高渗氯化钠高氧液对失血性休克家兔血乳酸和动脉血气的影响

目的:观察高渗氯化钠高氧液对失血性休克家兔动脉血气和血乳酸值的影响，评价其对失血性休克的早期救治效果。方法:制备高渗氯化钠溶液(HS)、生理盐水高氧液（NSO）和高渗氯化钠高氧液(HSO)。30只雄性家兔制备失血性休克模型［于10min内使平均动脉压（MAP）降至40mmHg（1mmHg＝0.133kPa），维持60min］，随机分为NSO，HS，HSO组3个治疗组。分别按6mL/kg剂量5min内静脉输入NSO,HS和HSO。记录休克前后及给药后心率（HR）、呼吸（RR）、MAP及尿滴（UD），测定休克前、休克60min，给药后30，60，120min时血乳酸（BL）和动脉血气值。最后观察尸肺，测定肺系数。结果:HS和HSO组均显著地改善MAP，HR和UD，降低BL，改善代谢性酸中毒,肺系数明显低于NSO组。HSO与NSO及HS比较，能更显著地降低血BL，提高动脉血氧饱和度（SaO2）和动脉血氧分压（PaO2）。结论:HSO较HS和NSO能更显著地降低血BL,提高SaO2和PaO2，对失血性休克的早期救治具有较高的使用价值。     

Poly-l-aspartic acid protects cultured human proximal tubule cells against aminoglycoside-induced electrophysiological alterations

Cultured human proximal tubule cell monolayers maintained on permeable supports were treated simultaneously with the aminoglycoside antibiotic, gentamicin, and poly- -aspartic acid (PAA), an inhibitor of aminoglycoside nephrotoxicity. Following 4 days of exposure, cell monolayers were placed into Ussing chambers to allow monitoring of transepithelial electrical properties. For each of the three cell isolatation examined, aminoglycoside-induced alterations in electrogenic transport, reflected by changes in short-circuit current (Isc), as well as alterations in paracellular properties, indicated by changes in transepithelial electrical resistance (R_T), were diminished in the presence of PAA. Alterations resulting from selective basolateral exposure to gentamicin were unchanged in the case of apically applied PAA and attenuated only when PAA acid was added basolaterally. This is the first demonstration of PAA inhibition of aminoglycoside-induced cellular alterations involving human cells.     

健脾降脂颗粒中绿原酸的含量测定

目的　研究健脾降脂颗粒中绿原酸的含量测定方法。方法　采用高效液相法。色谱柱YWGC18(2 5 0mm× 4 6mm ,10 μm) ,室温 ,10 %乙腈─冰醋酸 (5∶0 1)为流动相 ,流速为 1mL/min ,检测波长 32 9nm。结果　绿原酸在 0 0 2 0 8～ 0 10 4 μg范围内呈线性关系 (r =0 9994 ,n =5 ) ,平均加样回收率为 96 2 3% ,RSD为 0 798%。结论　本方法准确、可行 ,可用于健脾降脂颗粒的质量控制     

Prognostic significance of cytochemical analysis of leukemic M2 blasts

Cytochemical analysis of leukemic blasts from 46 patients with acute myeloblastic M2 leukemia (according to the FAB classification) was performed before and after cytostatic therapy, and compared with findings obtained in 20 age- and sex-matched control subjects. Cytochemical findings for myeloperoxidase (MPO), Sudan black B, acid phosphatase and alpha-naphthyl-acetate esterase (ANAE) were related to the achievement of the first complete remission (CR),i.e. data were compared after the patients had been divided into CR and non-CR groups. The analysis clearly showed that a high proportion of myeloperoxidase- and, to a lesser extent, Sudan black B-positive blasts before treatment may have constituted a significantly unfavourable prognostic factor.     

日晒海盐工人机体内高镁反应

报道福建某盐场从事日晒海盐生产人工机体内高镁对心血管系统的影响，通过现场空气、饮水、主良的镁含量测定，并对进入机体途径进行分析，得出空气、卤水接触、饮水为机体镁增高的主要来源。不同对象头发镁含量测定结果显示，以接触卤水、劳动强度大的盐工最高，并随机体内镁含量增高，出现血压偏低、心率减慢、心电图Ｐ－Ｒ间期延长、ＱＲＳ波增宽、Ｔ波高尖等机体高镁反应，与临床高镁血症相似。     

钙调素拮抗剂E6对大鼠脑一氧化氮合酶活性和突触体谷氨酸释放的影响

目的 探讨钙调素拮抗剂E6的抗脑缺血作用机制。方法 用[3H]-L-Glu（glutamic　acid,Glu）标记大鼠脑突触体,测定突触体的Gln释放量和用一氧化氮合酶（nitric oxide synthase,NOS）试剂盒测定成年大鼠脑匀浆上清中NOS活性。结果　E6促进Glu释放（与对照组比,10-5mol·L-1组增加81.0％）,但对KCl（50 mmol·L-1）引起的Glu释放有抑制作用,10-5mol·L-1E6的抑制率为23.2％。E6浓度依赖性地抑制NOS活性。钙调素（calmodulin,CaM）（30μg·ml-1）可逆转E6的抑制作用（10-6mol·L-1E6的抑制率为13.7％）,N-硝基-精氨酸（（N-nitro-arginine,L-NNA）（10μmol·L-1）可加强E6的抑命作用（10-6mol·L-1的抑制率为76.5％）。结论 E6是与CaM结合后发挥抑制 NOS活性效应的,E6对Glu 释放的影响可能与其对NOS活性及其对神经细胞内Ca2+影响有关。     

Effect of surface conditioning methods on the bond strength of luting cement to ceramics

OBJECTIVES: This study evaluated the effect of three different surface conditioning methods on the bond strength of a Bis-GMA based luting cement to six commercial dental ceramics. METHODS: Six disc shaped ceramic specimens (glass ceramics, glass infiltrated alumina, glass infiltrated zirconium dioxide reinforced alumina) were used for each test group yielding a total number of 216 specimens. The specimens in each group were randomly assigned to one of the each following treatment conditions: (1) hydrofluoric acid etching, (2) airborne particle abrasion, (3) tribochemical silica coating. The resin composite luting cement was bonded to the conditioned and silanized ceramics using polyethylene molds. All specimens were tested at dry and thermocycled (6.000, 5-55 degrees C, 30 s) conditions. The shear bond strength of luting cement to ceramics was measured in a universal testing machine (1 mm/min). RESULTS: In dry conditions, acid etched glass ceramics exhibited significantly higher results (26.4-29.4 MPa) than those of glass infiltrated alumina ceramics (5.3-18.1 MPa) or zirconium dioxide (8.1 MPa) (ANOVA, P<0.001). Silica coating with silanization increased the bond strength significantly for high-alumina ceramics (8.5-21.8 MPa) and glass infiltrated zirconium dioxide ceramic (17.4 MPa) compared to that of airborne particle abrasion (ANOVA, P<0.001). Thermocycling decreased the bond strengths significantly after all of the conditioning methods tested. SIGNIFICANCE: Bond strengths of the luting cement tested on the dental ceramics following surface conditioning methods varied in accordance with the ceramic types. Hydrofluoric acid gel was effective mostly on the ceramics having glassy matrix in their structures. Roughening the ceramic surfaces with air particle abrasion provided higher bond strengths for high-alumina ceramics and the values increased more significantly after silica coating/silanization.