共查询到20条相似文献，搜索用时 46 毫秒
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采用荧光光度法测定了鸡肉和鱼肉肌肉中洛美沙星药物的残留量．样品用酸性乙腈提取,正己烷脱脂,水相在B—R（pH3．0）缓冲溶液中,激发波长λex=275nm,荧光波长λem=450nm下用荧光光度法测定其中的洛美沙星含量,洛美沙星线性范围是10~120μg／mL,相关系数r=0．9958,检出限为0．005μg／mL．样品回收率为76．0％-94．5％,日内变异系数为2．14％~6．50％,日间变异系数为3．02％～9．78％． 相似文献
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分光光度法测定尼古丁的含量 总被引：1，自引：0，他引：1
高玉莲 《吕梁高等专科学校学报》2006,22(2):8-9
研究了分光光度法测定尼古丁的方法,测定下限为0．81μg／mL,线性回归方程Abs=0．05976 0．00108x(mL),相关系数r=0．9996;尿液中的加标回收率在80．4％-138％,RSD在0．12％- 3．88％(n=4)． 相似文献
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在过硫酸钾存在下的近中性介质中,头孢噻肟钠能够增强荧光桃红的荧光强度,从而建立了荧光法测定头孢噻肟钠含量的新方法。头孢噻肟钠的质量浓度与荧光强度的变化在0．6～3．0μg/mL范围内呈良好的线性关系（1=0．9984）,对浓度为1．0μg／mL的头孢噻肟钠试液连续测定11次,相对标准偏差（RSD）为1．25％,检出限为0．0376μg／mL。该法简便、快速,结果可靠,并应用于药物制剂中头孢噻肟钠含量的测定,结果令人满意。 相似文献
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苯酚分光光度法测定食品中硝酸盐与亚硝酸盐 总被引：1，自引：0，他引：1
将苯酚法分光光度法应用于硝酸盐和亚硝酸盐含量的测定,并对测定条件进行了优化．结果表明：硝酸盐的回归方程Y=97．636X-2．1459,相关系数为0．9986,检出限为0．25μg/mL,精密度为0．424％;亚硝酸盐的回归方程Y=74．093X-0．7929,相关系数为0．9982,检出限为0．61μg／mL;硝酸盐和亚硝酸盐加标回收率为91．6％-104％．该方法简化操作过程,结果准确可靠,适用于多种食品基质中亚硝酸盐和硝酸盐的分析． 相似文献
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用导数．比导数波谱同时测定DNA和RNA，并探讨了最佳测定条件。当DNA和RNA的浓度在最佳线性范围加．140μg／ml内，其标准曲线方程分别为Y=0．0035X 0．0142(r=0．9982)和Y=0．0248X-0．0235(r=0.9997)，检测限分别为2．0355μg／ml和0．0359μg／ml，回收率为87．5％-111．0％，相对标准偏差不大于6．76％。该法用于合成样品分析，结果满意。 相似文献
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优化测定乳制品中三聚氰胺含量的高效液相色谱方法。色谱条件：ODS—SPe18柱,250mm×4．6mm（i．d．）,5μm;流动相：A为离子对缓冲液（2．02g庚烷磺酸钠和2．10g柠檬酸,加入约950mL水溶解,调节pH值至3．0后,定容至1L）,B为乙腈,配制比例为85％A＋15％B;1．0mL／min;柱温：35℃;波长：242nm;选样量：20灿。结果表明：三聚氰胺标准曲线为Y=-5．582＋42．55x,相关系数R=0．9997,在1．0-50．0μg／mL范围内线性关系良好．样品三个浓度水平的加标回收率在90．1—105．9％之间,相对标准偏差为2．04-5．26％。 相似文献
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张佩君 《陕西教育学院学报》2007,23(1):88-90,111
选用健康种猪18头,按1、2、3月龄分为3组,每组6头,无菌采取前腔静脉血10 mL,肝素抗凝,分离外周血单个核细胞(PBMC),计数并稀释成1×10~7个/mL、5×10~6个/mL、2．5×10~6个/mL、1．25×10~6/mL、6．25×10~5个/mL五个浓度梯度;植物血凝素—p(PHA—p)配成100μg/mL、50μg/mL、25μg/mL、12．5μg/mL、6．25μg/mL五个浓度梯度。采用正交试验法在96孔细胞培养板中加入不同浓度的PBMC和PHA—p,用MTT法检测淋转试验结果。三组试验结果均表明PBMC和PHA—p对猪淋巴细胞增殖反应均有显著的影响(0．01＜p＜0．05),其最佳反应条件组合为:PBMC浓度为1．25×10~6个/mL,PHA—p浓度为12．5μg/mL,同时也表明年龄大小不影响猪的淋转试验。 相似文献
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采用水热法合成了一个金属-有机配位聚合物[Cd（SA）（Bim）2（μ2-OH2）]n1（H2SA=丁二酸,Bim=苯并咪唑）．并对其进行了元素分析、红外光谱、热重和X射线单晶衍射测定．该配合物属于单斜晶系,空间群C2／c,晶胞参数：a=13．156（3）,b=14．067（3）,c=9．783（2）A,β=97．399（2）°,V=1795．3（6）A,C18 H16CdN4O5,Mr=480．75,Dc=1．779g／cm^3,μ（MoKα）=1．256mm^-1,F（000）=960,Z=4,R=0．0220,wR=0．0583． 相似文献
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对薄层色谱法测定辅酶Q0的操作条件进行探索。选择了以丙酮为溶剂对样品进行溶解，以石油醚-乙酸乙酯（体积比9：4）为展开剂上行展开，密封展板后在波长269nm下进行测量。其定性检测结果：各组分分离良好，斑点集中且清晰。定量检测结果：线性范围为0．4～6μg，线性方程为Y（μv）=10195．6＋30544．6X（μg）（n=6），相关系数为0．9983，加标回收率94．6％，仪器精密度RSD：0．07％（n=3），同板精密度RSD=0．79％（n=3）。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献