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用景天观察表皮细胞和气孔初中《生物》第一册（上），实验七中“观察叶片的下表皮实验”，材料是用蚕豆、菠菜、槐树的叶，其缺点是表皮不易剥离，且受季节的限制。用景天作观察材料有以下优点：１．景天是多年生草本植物，叶肉质绿色，四季常绿，随时可采摘。２．景天叶... 相似文献
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以甲醇为溶剂,超声提取景天祛斑片中红景天苷,提取液经氧化铝柱纯化后,采用RP-HPLC法测定红景天苷的含量．实验结果显示,红景天苷在0．1280～3．196峭范围内呈现良好的线性关系,平均回收率为98．21％（n=5）,变异系数小于1．33％．该方法准确、灵敏、简便,可用于景天祛斑片中红景天苷的含量测定． 相似文献
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高燕梅 《渭南师范学院学报》1999,(5)
急性缺血性脑血管疾病主要是在脑动脉粥样硬化基础上的血栓形成所致．开展高血压病动脉粥样硬化的早期防治,积极治疗脑血管病的危险因素,如糖尿病、高血压病、心血管病等,能有效地降低脑血管病的发病率和致残率．目前尤其要重视“超早期治疗”的重要性 相似文献
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桂枝汤对动脉粥样硬化大鼠血管活性物质的影响 总被引：1，自引：0，他引：1
目的:研究桂枝汤对长期高脂饲料喂养引起的大鼠动脉粥样硬化模型血脂和血管内皮活性因子的作用.方法:48只大鼠随机分为5组:正常组(普通饲料),n=8;模型组(高脂饲料喂养复制大鼠动脉粥样硬化模型),n=10;阳性对照组(模型组加辛伐他汀灌胃),n=10;桂枝汤低浓度组(模型组加桂枝汤10g/(kg·d)灌胃),n=10;桂枝汤高浓度组(模型组加桂枝汤20g/(kg·d)灌胃),n=10.喂养14周用光镜观察动脉斑块形成后检测各组血清总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C),放免法测定血浆内皮素(ET)和血管紧张素Ⅱ(AngⅡ)含量.结果:桂枝汤持续治疗6周后,相对于模型组,血清TG、TC、LDL-C浓度降低(P<0.01),HDL-C浓度升高(P<0.01),ET和AngⅡ含量降低(P<0.01).结论:桂枝汤可降低血脂和血管内皮活性因子,保护血管内皮,改善血管内皮功能. 相似文献
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研究评价6周游泳运动对载脂蛋白E（apoE-／-）敲除的6周龄大鼠脂质代谢和动脉粥样硬化的影响。大鼠分为对照组（n=7）和运动组（n=7）。运动组大鼠进行6周递增负荷游泳运动,每周均按照第一天10分钟,每周5天（每天增加10分钟,直到连续运动1小时）。评价运动前和运动后血浆总胆固醇。处死大鼠后评价胸、腹主动脉粥样硬化的面积。体重、脂代谢两组结果相似。运动组的相关统计指数降低,表明apoE-/-大鼠游泳运动后动脉粥样硬化病变减少。但这种改变与脂肪代谢无关。 相似文献
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目的:用液质联用技术,分析紫景天的化学成分.方法:采用醇提法提取紫景天中的化学成分,运用液相色谱-质谱联用法进行检测.结果:通过对254nm波长下的液质图谱的解析,分析出紫景天中舍有β-谷甾醇、草质素-8-甲醚和草质素-7-0-α-L-吡喃鼠李糖苷.结论:液质联用技术能够快速准确的分析出紫景天中的化学成分,为多组分样品的分析提供了快速便捷的方法. 相似文献
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盐胁迫会影响种子的萌发进程、降低种子的发芽率，是影响植物生长，降低产量的主要因素之一。用50、100、200、400 mmol/L的NaCl溶液和蒸馏水处理景天三七和反曲景天的种子。通过对两种景天种子萌发特性、幼苗生长等指标的测定，探究其对不同盐浓度的耐受性。结果表明：2种景天种子萌发参数的各项指标随着NaCl溶液浓度的升高而呈现下降趋势，表现为发芽速率降低、发芽时间推迟等。在盐浓度大于200 mmol/L时，两种景天种子基本失去发芽能力。随着盐浓度的增加，景天三七幼苗在盐浓度为400 mmol/L时，出现叶片发黄、变黑、死亡，而反曲景天幼苗则正常生长。景天三七幼苗的叶片叶绿素含量随着NaCl溶液浓度的增加而降低，而反曲景天幼苗则在50和200 mmol/L的盐溶液处理下叶片叶绿素含量高于对照组。景天三七和反曲景天均有较强的耐盐性，都能在100 mmol/L盐胁迫条件下正常生长，但相比之下，反曲景天耐盐能力更强。 相似文献
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阿魏酸钠对高脂饮食致动脉粥样硬化的作用 总被引：2，自引：0，他引：2
目的:探讨阿魏酸钠(SF)抗动脉粥样硬化(AS)的作用及其机理.方法:18只家兔随机分为三组:对照组、高脂组、SF组.分别给予普通饲料、高脂饲料、高脂饲料加SF.10周末颈动脉放血取血样后,处死动物,检查血脂、观察主动脉粥样硬化斑块变化、主动脉超微结构.结果:⑴高脂组和SF组血脂含量显著高于对照组,SF组甘油三脂(TG)含量显著低于高脂组(P<0.05);⑵SF组AS斑块显著低于高脂组(P<0.01);⑶电镜结果显示SF组主动脉损伤明显减轻.结论:SF具有明显的抗AS形成的作用,其机制是:降低血中TG含量,保护内皮细胞. 相似文献
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Research on the protection effect of pioglitazone for non-alcoholic fatty liver disease （NAFLD） in rats 总被引：4，自引：0，他引：4
Objective： The prevalence of non-alcoholic fatty liver disease （NAFLD） has markedly increased. Insulin resistance has been implicated in the pathogenesis of NAFLD. This study was aimed at observing the relationship between insulin resistance and NAFLD, and evaluating the role of pioglitazone （PGZ） acting as insulin-sensitizing agents in the prevention and treatment of rat fatty liver induced by high fat feeding. Methods： The rats were separated randomly into 6 groups： model group Ⅰ were fed high fat diet for 8 weeks, PGZ prevention group were given PGZ 4 mg/（kg.d） simultaneously, while control group Ⅰ were fed normal food for 8 weeks; model group Ⅱ were fed high fat diet for 16 weeks, PGZ treatment group were given PGZ 4 mg/（kg.d） orally simultaneous with high fat diet for 8 weeks after high fat feeding for 8 weeks, control group Ⅱ were fed normal food for 16 weeks. The rats were sacrificed after 8 weeks and 16 weeks respectively. Liver weight, body weight, serum activities of alanine aminotransferase （ALT）, aspartate aminotransferase （AST）, alkaline phosphatase （ALP）, tumor necrosis factor alpha （TNF-α）, fasting blood glucose （FBG）, fasting plasma insulin （FINS）, HOMA （homeostasis model assessment） insulin resistance index （HOMA-IR）, and the liver histology of rats of all groups were assayed. Results： After 8 weeks, the liver in model group Ⅰ showed typical steatosis, accompanied with mild to moderate lobular inflammatory cell infiltration, liver indexes and serum levels of ALT, AST, ALP, TNF-α were significantly increased （P〈0.05） compared with control group Ⅰ. Whereas, the degree of hepatic injury was attenuated in PGZ prevention group, liver indexes and serum levels of ALT, ALP were significantly decreased （P〈0.05） compared with model group Ⅰ. After 16 weeks, notable steatosis, and lobular inflammation were observed in model group Ⅱ rat liver, while the degree of hepatic injury was attenuated in the PGZ treatment group. Liver index, serum levels ofALT, AST, ALP, FINS and HOMA-IR were significantly increased （P〈0.05） in model group Ⅱ compared with control group Ⅱ. Whereas, in PGZ treatment group, serum levels of AST and FINS showed decreasing tendency, liver indexes, serum levels of ALT, ALP, TNF-α and HOMA-IR were significantly decreased compared with model group Ⅱ. Conclusion： Insulin resistance plays a role in the pathogenesis of NAFLD in rats. Pioglitazone can attenuate insulin resistance and biochemical and histological injury in high fat-induced fatty liver in rats. 相似文献
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目的：探讨藻酸双脂钠（PSS）治疗急性脑梗死患者血液成分变化及疗效。方法：急性脑梗死患者158例，随机分为两组。对照组：78例，常规治疗；治疗组：80例，在常规治疗基础上，应用藻酸双脂钠注射液100mg加入0．9％氯化钠静脉滴注，每日一次，连续观察14d。对比分析二组治疗前后脂蛋白（a）、血脂、纤维蛋白原等血液流变学指标．并动态观察治疗前后临床神经功能缺损评分。结果：藻酸双脂钠可降低全血粘度、血浆粘度、血小板聚集率、纤维蛋白原及血清TC、TG、LDL，与治疗前比较有显著性改变（P〈0．01或P〈0．05）；与对照组比较有显著性差异（P〈0．01或P〈0．05）．但对脂蛋白（a）无影响；近期预后较常规治疗组好（P〈0．05）．结论：藻酸双脂钠可改善血液高粘滞状态，起到降低纤维蛋白原、抗血小板聚集作用，可改善近期临床神经功能缺损程度。 相似文献
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有氧健身操对肥胖型女大学生身体成分的影响 总被引：2，自引：0，他引：2
通过对部分肥胖型女大学生16周有氧健身操锻炼前后的身体成分的测试，结果显示：长期进行有氧健身操锻炼能使肥胖型女大学生体重、体重指数、体脂含量和体脂百分比下降，去脂体重增加。研究提示：长期有氧健身操锻炼能改善肥胖型女大学生脂代谢，改变身体成分，使瘦体重和体脂占总体重的百分比更加合理，对增强体质，预防肥胖并发症有积极的作用。 相似文献
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选取抑郁和焦虑症状比较明显的大学生分成实验组和对照组,分别应用体育锻炼和传统谈话法进行为期10周的对比实验,实验前、后用SDS和SAS对实验组和对照组分别进行测试。结果表明：1.体育锻炼能够较明显的降低大学生的抑郁程度,干预效果显著;同时也能在一定程度上减缓大学生的焦虑程度,但是干预效果不是十分明显;2.谈话法也能够在一定程度上减轻大学生的抑郁和焦虑状态,但对二者都没有明显的干预效果。结论：与谈话法相比,体育锻炼的方式能够更好地改善大学生的不良心理品质。 相似文献
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Chen XC Weng J Chen XQ Du JZ Zhu MP Pan YQ Liu M 《Journal of Zhejiang University. Science. B》2008,9(9):739-746
Objective: To study the relationships among magnetic resonance imaging (MRI), histological findings, and insulin-like growth factor-I (IGF-I) in steroid-induced osteonecrosis of the femoral head in rabbits. Methods: Thirty rabbits were randomly divided into experimental Group A (n=15) and control Group B (n=15). The 7.5 mg/kg (2 ml) ofdexamethasone (DEX)and physiological saline (2 ml) were injected into the fight gluteus medius muscle twice at one-week intervals in animals of Groups A and B, respectively. At 4, 8 and 16 weeks after obtaining an MRI, the rabbits were sacrificed and the femoral head from one side was removed for histological study of lacunae empty of osteocytes, subchondral vessels, and size of fat cells under microscopy, and the femoral head from the other side was removed for enzyme-linked immunoadsorbent assay (ELISA) for IGF-I.Results: At 4, 8 and 16 weeks after treatment, no necrotic lesions were detected in Group B, while they were detected in Group A.Light microscopy revealed that the fat cells of the marrow cavity were enlarged, subchondral vessels were evidently decreased,and empty bone lacunae were clearly increased. The IGF-I levels in Group A were significantly higher than those in Group B. At 8 weeks after the DEX injection, the MRI of all 20 femora showed an inhomogeneous, low signal intensity area in the femoral head,and at 16 weeks, the findings of all 10 femora showed a specific "line-like sign". The MRI findings of all femora in Group B were normal. Conclusion: MRI is a highly sensitive means of diagnosing early experimental osteonecrosis of the femoral head. However, the abnormal marrow tissues appeared later than 4 weeks when the expression of IGF-I increased. This reparative factor has an early and important role in response to steroid-induced osteonecrosis of the femoral head, and provides a theoretical foundation for understanding the pathology and designing new therapies. 相似文献
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太极剑锻炼对动脉粥样硬化患者NO及血脂的影响 总被引：1，自引：0，他引：1
杨春霞 《陕西教育学院学报》2007,23(4):93-95
通过对动脉粥样硬化患者太极剑锻炼前后一氧化氮(NO)及血脂各项指标的测试,探讨太极剑锻炼对动脉粥样硬化老年患者的影响。结果显示,经过一年半的太极剑锻炼,可以明显改善动脉粥样硬化患者的血脂;提高患者体内一氧化氮(NO)的含量。研究表明,太极剑锻炼延缓动脉粥样硬化病变的形成,对于动脉粥样硬化的预防和治疗具有积极意义。 相似文献
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目的:探讨辛伐他汀治疗脂肪肝的的临床疗效。方法:120例脂肪肝患者随机分为两组,辛伐他汀治疗组60例采用辛伐他汀20mg,每天1次口服;血脂康治疗组60例采用血脂康600mg,每天2次口服。8周为1个疗程,共3个疗程,观察辛伐他汀治疗组与血脂康治疗组的临床疗效、治疗前后血脂和B超变化情况,另选择同期体检证明为正常的健康者70人作为对照组。结果:辛伐他汀治疗组总有效率(93.1%)与血脂康组(90.3%)相似(P>0.05);辛伐他汀治疗组和血脂康治疗组治疗后与治疗前相比血总胆固醇(TC)、甘油三脂(TG)、高密度脂蛋白(HDL-C)均明显改善(P<0.01),辛伐他汀治疗组改善优于血脂康组(P<0.05或P<0.01),辛伐他汀治疗组与血脂康治疗组两组治疗后肝功能与治疗前相比均明显改善(P<0.01),但辛伐他汀治疗组与血脂康治疗组两组治疗后相比无显著差异(P>0.05),未见严重不良反应。结论:辛伐他汀是治疗高血脂和脂肪肝的有效药物之一,且副作用少,安全性大,值得临床应用。 相似文献
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Human bone marrow-derived mesenchymal stem cells transplanted into damaged rabbit heart to improve heart function 总被引：18，自引：0，他引：18
INTRODUCTION Congestive heart failure is the end stage of manycardiovascular diseases. Myocardial infarction (MI)is a life-threatening event that may cause suddencardiac death and heart failure. Despite considerableadvances in diagnosis and treatment of heart disease,cardiac dysfunction after MI is still the majorworldwide cardiovascular disorder. Damaged myo-cardium after acute MI is gradually replaced by fi-brotic noncontractile cells to form scar tissue. Thedeveloping ventricul… 相似文献