含硫芳香族衍生物的厌氧微生物降解

测定了一批苯亚砜基、砜基乙酸酯类化合物的厌氧微生物降解速率常数Ｋｂ,在此基础上对这类化合物的结构与其生物降解速率常数之间的关系进行了分析．表明：苯亚砜基乙酸酯类化合物的降解速率大于苯砜基乙酸酯类化合物;甲酯比异丙酯易降解;苯环上氯取代会降低化合物的生物可降解性     

A preliminary study on the teratogenesis of dexamethasone and the preventive effect of vitamin B12 on murine embryonic palatal shelf fusion in vitro

Excessive dexamethasone （Dex） administrated into pregnant mice during critical periods of palatal development can produce a high incidence of cleft palate. Its mechanisms remain unknown. Vitamin B12 has been shown to antagonize the teratogenic effects of Dex, which, however, remains controversial. In this study, we investigated the effects of Dex and vitamin B12 on murine embryonic palatal shelf fusion using organ culture of murine embryonic shelves. The explanted palatal shelves on embryonic day 14 （E14） were cultured for 24, 48, 72 or 96 h in different concentrations of Dex and/or vitamin B 12. The palatal shelves were examined histologically for the morphological alterations on the medial edge epithelium （MEE） and fusion rates among different groups. It was found that the palatal shelves were not fused at 72 h or less of culture in Dex group, while they were completely fused in the control and vitamin B 12-treated groups at 72 and 96 h, respectively. The MEE still existed and proliferated. In Dex＋vitamin B12 group the palatal shelves were fused at each time point in a similar rate to controls. These results may suggest that Dex causes teratogenesis of murine embryonic palatal shelves and vitamin B12 prevents the teratogenic effect of Dex on palatogenesis on murine embryos in vitro.     

配合物[CoL（NO3）]·（NO3）·8H2O的晶体结构及其对4-硝基苯酚醋酸酯水解的催化研究

合成了单核配合物[CoL（NO3）]·（NO3）·8H2O单晶,其中L为穴状配体。配合物为单斜晶系、P2（1）c空间群,Co（Ⅱ）离子和大环上的四个氮原子以及NO3上的两个O原子配位呈八面体构型。该配合物能有效地催化4一硝基苯酚醋酸酯的水解反应。实验表明,在pH=9.10时,二级速率常数Kcat=0.0027L·mol^-1·s^-1。     

用地塞米松冷藏保存的离体肺顺应性的变化

目的观察用地塞米松冷藏保存的离体肺顺应性的变化。方法将32只家兔肺随机均分至对照组、用地塞米松冷藏(4℃)保存24 h组7、2 h组和120 h组。对照组:测定室温条件下的肺顺应性。冷藏组:在相应时间取出肺,室温条件下复温后,置入生理盐水中,测定注气(生理盐水)和抽气(生理盐水)过程中,肺容积在10mL、20mL、30mL时的肺的顺应性。结果各组与对照组比较,均存在显著性差异,P<0.05或P<0.01。结论用地塞米松冷藏保存后离体肺顺应性增强,其影响程度随冷藏时间增加而增大。     

激素类药物醋酸地塞米松纳米粒的制备及其质量评价

以单硬脂酸甘油酯为载体,应用乳化-溶剂挥发法制备醋酸地塞米松纳米粒,测定其粒径、药物包封率等性质。经过正交优化试验确定其优选方案为：载体材料单硬脂酸甘油酯的用量为0.3g,表面活性剂为硬脂酸聚烃氧酯（S-40）/泊洛沙姆（F68）（质量比为7/3）的混合物,有机相氯仿与水相的体积比为5：75,蒸发有机相氯仿时的真空度为0.05MPa。制备所得的醋酸地塞米松纳米粒球体均匀度好,平均粒径在100nm左右,载药纳米粒的包封率在89.03%左右。     

糖皮质激素性骨质疏松模型大鼠在性别上的差异性研究

目的 研究对糖皮质激素性骨质疏松模型大鼠在性别上的差异性,为该模型的应用提供背景数据。方法 骨质疏松组雌性大鼠和雄性大鼠在第1天~第21天按2.5 mg/kg体质量,第22天~第63天按1 mg/kg体质量肌肉注射地塞米松磷酸钠注射液,正常对照组大鼠肌肉注射等体积的氯化钠注射液,1次/2 d,持续9周。末次注射 后1 h所有动物麻醉取血和组织,血清检测ALP、Ca、P、维生素D3、降钙素含量;股骨检测骨密度和骨生物力学;胫骨进行病理组织学检查。结果 与正常对照组比较,骨质疏松组的雄性大鼠出现了股骨、腰椎L4骨 密度下降,血清中的ALP升高,钙、磷、降钙素下降,股骨的最大应变和最大负荷下降,胫骨组织病理评分升高,均具有统计学差 异（P < 0.05或P < 0.01 ）;而雌性大鼠只见有股骨骨密度下降、ALP升高、胫骨组织病理评分升高（P < 0. 05或P < 0.01 ）。此外,骨质疏松组雄性动物的骨小梁较该组雌性的减少、疏松和变细,差异均有统计学意义（B<0. 05 ）。结论 制 备GIOP模型,雄性大鼠在症状和骨质疏松指标上较雌性大鼠更为明显、稳定。     

高效液相色谱法测定地塞米松棕榈酸酯注射液中的有关物质

为建立高效液相色谱法测定地塞米松棕榈酸酯注射液(乳剂)中的有关物质和含量检测的有效方法,采用ODS-C18色谱柱(4.6×250 mm,5μm),流动相为乙腈:水(梯度洗脱),流速1.0 mL·min-1,检测波长240 nm,柱温50℃。结果使有关物质地塞米松与主峰得到良好分离,分离度大于2,在0.25~16.0μg/mL范围内线性关系良好。地塞米松浓度与峰面积之间呈现良好线性关系,r2=0.999 9(n=8),回收率均在84.7%~97.9%之间,RSD(%)小于2.0%。地塞米松棕榈酸酯在20.04~400.8μg/mL间呈现良好线性关系,r2=0.999 3(n=6),回收率均在99.2%~100.9%之间,RSD(%)小于2.0%。该方法简便、准确、专属,可用于该注射液的质量控制。     

Sexual dimorphism in the lipid fraction of the defensive secretion ofGastrophysa viridula (Coleoptera: Chrysomelidae)

The lipid fraction of the defensive secretion of adultGastrophysa viridula was analyzed by gas-liquid chromatography and gas chromatography-mass spectrometry. Three long chain acetates and two methyl-branched hydrocarbons were identified and their amounts in the secretion of single field-collected and laboratory-reared beetles determined. The composition of the secretion was affected by the sex, reproductive status, and age of the beetle. The ratio of (Z)-11-eicosenyl acetate to (Z)-13-docosenyl acetate ranged from 0.30 to 0.78 in male beetles and from 1.05 to 2.06 in female beetles. The biological significance of this sexual dimorphism is discussed.     

地塞米松磷酸钠注射液的化学发光测定法

用自行设计的HF-1型智能化学发光测定仪建立地塞米松磷酸钠注射液的化学发光测定新方法,碘与鲁米诺反应的产物会发射出一定波长的光线,其强度与磷酸盐的含量成正比,此法简便可行,相对标准偏差为1.79％和2.36％,回收率为97.93％和102.3％。     

大剂量地塞米松影响谷氨酸兴奋性神经毒性的在体和离体观察

研究了大剂量地塞米松对谷氨酸诱发清醒小鼠和离体小鼠原代培养皮层细胞兴奋毒性损伤的影响。小鼠单侧纹状体灌注谷氨酸单钠（ＭＳＧ）引起纹状体内局灶性损伤,此损伤可被６ｍｇ／ｋｇＭＫ－８０１预防。５０ｍｇ／ｋｇ地塞米松每日腹腔注射使该损伤体积增加约１１０±２４．５％。地塞米松还促进ｄｌ－谷氨酸对小鼠原代培养皮层细胞活性的损伤。大剂量地塞米松增加小鼠脂质过氧化产物ＭＤＡ含量,但不增加小鼠不完全性脑缺血所致ＭＤＡ升高,且明显减轻缺血性谷胱甘肽过氧化物酶活性的抑制。对小鼠皮层分离细胞,３μｍｏｌ地塞米松快速并明显加强谷氨酸诱发的细胞内游离钙升高。结果提示：大剂量糖皮质激素增加神经元兴奋性毒性损伤可能有钙相关的快速效应参与