共查询到20条相似文献，搜索用时 78 毫秒
1.
为了探讨山楂叶提取物对麻醉开胸犬左心室的影响,本试验通过对犬的左心室的收缩力、作功、室内压、内压最大上升速率的测定。结果显示,山楂叶提取物能增强心肌收缩力,增大心室的运动振幅,具有强心作用。 相似文献
2.
山茱萸不同提取物降血糖作用研究 总被引：1，自引：0，他引：1
以正常小鼠和四氧嘧啶糖尿病小鼠为动物模型,分别对山茱萸乙醚提取物、乙酸乙酯提取物和乙醇提取物的降血糖作用进行研究。结果表明,山茱萸3种提取物组与模型组比较,均可显著降低四氧嘧啶糖尿病小鼠血糖水平(P0.01)。山茱萸3种提取物组间比较,乙酸乙酯提取物组的降血糖作用最明显(P0.05)。正常小鼠对照实验表明,山茱萸3种提取物对正常小鼠的血糖无明显影响(P0.05)。本试验筛选出山茱萸乙酸乙酯提取物为山茱萸的降血糖活性成分。 相似文献
3.
目的:探讨黑种草籽乙酸乙酯提取物和乙醇提取物对成纤维细胞炎症模型作用及保护大肠杆菌感染小鼠的作用机制.方法:将两种提取物按不同浓度添加到细胞炎症模型中,观察细胞形态；将两种提取物均按1 g/mL浓度腹腔注射给炎症模型小鼠,观察小鼠临床症状,ELISA检测血清白细胞介素-10(IL-10)的表达水平.结果:0.1 g/mL乙酸乙酯提取物和0.4 g/mL乙醇提取物均可引起细胞病变,细胞固缩脱壁或裂解破碎；乙醇提取物在其安全浓度0.1-0.2 g/mL、乙酸乙酯提取物在其安全浓度0.025-0.05 g/mL均对细胞炎症模型有抗炎作用.与对照组比较,模型组小鼠血清IL-10显著升高(P＜0.05)；两种提取物治疗组IL-10水平均较模型组低,与对照组比较无显著差异,两种提取物(1 g/mL)均有降低炎症小鼠血清IL-10水平的趋势,对小鼠大肠杆菌的感染有保护作用,且乙醇提取物较乙酸乙酯提取物有效.结论:黑种草籽乙酸乙酯提取物和乙醇提取物在安全浓度内均对细胞炎症模型有抗炎作用；两种提取物(1 g/mL)均可降低炎症小鼠血清IL-10水平,且对小鼠大肠杆菌感染有保护作用,乙醇提取物较乙酸乙酯提取物好. 相似文献
4.
为研究两色金鸡菊提取物对小鼠的抗疲劳和耐缺氧作用,选择48只小鼠随机分为4组,即对照组,低、中、高剂量两色金鸡菊提取物组(每日5、10、20g/kg体重)。各组小鼠分别灌胃(每日0.20mL/10g)给予不同剂量的两色金鸡菊提取物,连续灌胃21d后,观察不同浓度的两色金鸡菊提取物对小鼠负重游泳时间及运动后小鼠血清尿素氮、血乳酸、肝糖原含量和小鼠常压耐缺氧存活时间、断头后呼吸维持时间的影响。结果表明,两色金鸡菊提取物能延长小鼠负重游泳时间,降低运动小鼠血清尿素氮、血乳酸含量,增加运动小鼠肝糖原含量,明显延长小鼠常压耐缺氧存活时间及断头后呼吸维持时间。结果提示,一定剂量的两色金鸡菊提取物具有抗疲劳作用和提高耐缺氧能力作用。 相似文献
5.
6.
千里光提取物的小鼠骨髓微核试验 总被引：3，自引：0，他引：3
制备了千里光70%乙醇提取物冻干粉,用昆明种雌雄性小鼠进行了该提取物的微核试验。结果发现,在雌性小鼠,中、高剂量的千里光70%乙醇提取物能够引起小鼠骨髓细胞微核发生率升高,而低剂量(130.9mg/kg)千里光70%乙醇提取物不能引起小鼠骨髓细胞微核发生率升高;在雄性小鼠,高剂量(1309.0mg/kg)千里光70%乙醇提取物能够引起小鼠骨髓细胞微核发生率升高,而低、中剂量的千里光70%乙醇提取物不能引起小鼠骨髓细胞微核发生率升高;而且小鼠骨髓细胞微核发生率与千里光70%乙醇提取物具有剂量依赖性。说明千里光70%乙醇提取物仅在较高剂量时能够对小白鼠产生致突变作用。 相似文献
7.
《畜牧与兽医》2021,(7)
研究香茅草、芡实、睡莲花3种新疆产药材的降糖作用。通过测量3种药物提取物对α-淀粉酶和α-葡萄糖苷酶活性抑制率,进而探究其体外降糖作用;同时,研究3种药物提取物对腹腔注射葡萄糖所致小鼠快速高血糖模型的影响。3种药物提取物都具有一定的体外降糖能力,且睡莲花提取物和芡实提取物对这2种酶活性的抑制作用具有一定的选择性,每毫升2 g生药的香茅草提取物和芡实提取物对α-淀粉酶的抑制率分别为88.3%和79.8%,每毫升1 g生药的睡莲花提取物对α-葡萄糖苷酶的抑制率为76.0%;睡莲花提取物可以预防正常小鼠的血糖升高,并且与另外2种药物相比,能显著降低正常小鼠的血糖曲线下面积。3种新疆产药材均表现出一定的体外降糖作用,且睡莲花提取物可以预防正常小鼠血糖升高,有一定的调节血糖作用。 相似文献
8.
本文研究了连翘提取物对小鼠的急性酒精肝损伤是否具有保护作用。取15只小鼠随机分为3组,A组为对照组、B组酒精组、C组连翘提取物+酒精组。连续定时处理7d后处死全部小鼠,取出肝脏、制成切片、HE染色,观察肝细胞变化。使用软件SPSS Statistics进行数据分析,结果是C组小鼠的肝细胞损伤较B组小鼠轻,没有杂乱细胞团块和明显坏死变性。说明连翘提取物对小鼠酒精肝损伤具有保护作用。 相似文献
9.
为了研究黑老虎果实提取物的抗腹泻作用,从而为临床应用提供实验依据。实验首先对黑老虎果实提取物中木脂素、三萜及黄酮含量进行测定,然后对ICR小鼠进行细菌性腹泻、药物性腹泻和小肠炭末推进实验。根据实验要求,将细菌性腹泻模型小鼠和药物性腹泻模型小鼠灌胃不同药物,连续7天,除正常组外,其余小鼠于末次给药30min后分别腹腔注射大肠埃希菌溶液和灌胃番泻叶提取液,观察并记录各组小鼠腹泻情况;小肠炭末推进实验于小鼠末次给药30min后灌胃给予5%炭末,计算小肠炭末推进率
;结果表明,黑老虎果实提取物中木脂素类、三萜类及黄酮类化合物的含量分别为44.48%、4.57%、14.02%黑老虎果实提取物各剂量组对细菌性小鼠均有较好的预防效果,其中高剂量组
（200mg/kg）最佳,与模型组呈显著差异（P＜0.01）,效果亦优于阳性药物组;提取物各剂量组均能减少番泻叶腹泻小鼠稀便数量,且与模型组呈显著差异,但对潜伏时间没影响;提取物对小鼠小肠炭末推进无明显影响
由此可知,黑老虎果实提取物对细菌性腹泻小鼠具有良好的抗腹泻作用,对药物性致腹泻作用较弱。 相似文献
10.
目的:探讨苦椿皮提取物对小鼠小肠平滑肌动力学作用,考察苦椿皮提取物对小鼠的小肠推进以及对小鼠离体小肠运动的影响。方法:给小鼠灌胃服用不同剂量的苦椿皮提取物,通过比较用药与未用药小鼠的小肠中墨汁推进率,观察苦椿皮提取物对小肠收缩的影响;利用生物机能系统检测不同浓度的苦椿皮提取物对小鼠离体小肠直接刺激后小肠收缩张力和频率的变化。结果:番泻叶对照组与空白组、苦椿皮提取物组相比,肠推进率差异均显著(P0.01);苦椿皮提取物组与空白组差异相比,肠推进率差异不显著(P0.05);随着苦椿皮提取物的浓度增大,肠道收缩波形振幅、蠕动频率均逐渐减小。结论:肠推进实验和离体小肠动力的研究结果表明,苦椿皮提取物对小肠运动有明显的抑制作用。 相似文献
11.
Du YH Jia RY Yin ZQ Pu ZH Chen J Yang F Zhang YQ Lu Y 《Veterinary parasitology》2008,157(1-2):144-148
The acaricidal activity of the petroleum ether extract, the chloroform extract and the acetic ether extract of neem (Azadirachta indica) oil against Sarcoptes scabiei var. cuniculi larvae was tested in vitro. A complementary log-log (CLL) model was used to analyze the data of the toxicity tests. The results showed that at all test time points, the petroleum ether extract demonstrated the highest activity against the larvae of S. scabiei var. cuniculi, while the activities of the chloroform extract and the acetic ether extract were similar. The activities of both the petroleum ether extract and the chloroform extract against the larvae showed the relation of time and concentration dependent. The median lethal concentration (LC(50)) of the petroleum ether extract (1.3muL/mL) was about three times that of the chloroform extract (4.1muL/mL) at 24h post-treatment. At the concentrations of 500.0muL/mL, the median lethal time (LT(50)) of the petroleum ether extract and the chloroform extract was 8.4 and 9.6h, respectively. 相似文献
12.
13.
柞蚕雄蛾浓缩液对肝细胞的保护和对高脂血症的治疗效果 总被引：4，自引：2，他引：2
为探讨柞蚕雄蛾浓缩液的保健和医用价值,分别就柞蚕雄蛾浓缩液对小鼠的保肝降酶作用和对半胱氨酸所致大鼠高脂血症的影响进行了实验。结果表明：该浓缩液可明显降低四氯化碳中毒小鼠血清中的谷丙转氨酶水平,因而能减少肝细胞变性、坏死的程度和范围,对受损伤的肝组织具有明显保护作用;可明显减轻肝组织脂肪样变性及降低由半胱氨酸所致高脂血症大鼠血清中的胆固醇、甘油三酯、低密度脂蛋白浓度,提高高密度脂蛋白浓度,因而对于高脂血症有良好的治疗效果。 相似文献
14.
15.
T Hashizume T Sasaki S Nonaka T Hayashi M Takisawa M Horiuchi T Hirata E Kasuya 《Reproduction in domestic animals》2005,40(2):184-189
It has been reported that the posterior pituitary (PP) gland contains a potent, unknown prolactin (PRL)-releasing factor (PRF) in rats. PRFs are assumed to be produced in neurones located within the hypothalamus, and to be peptidergic in nature. However, little is known about PRFs in domestic animals. To characterize the PRF in the PP of domestic animals, the present study examined the PRL-releasing activity of an acidic extract from bovine PP (bPP) in vitro and in vivo in cattle. First, the PRL-releasing effect of bPP extract was compared with that of PRL-releasing peptide (PrRP), and thyrotropin-releasing hormone (TRH) from cultured bovine anterior pituitary cells. The extract significantly increased PRL concentrations in the culture medium, at doses of 0.002 and 0.02 eq./ml (one eq. is the PP extract from one animal), compared with the control (p < 0.05). PrRP failed to stimulate the release of PRL. TRH significantly increased PRL concentrations in the culture medium, at doses from 10(-9) to 10(-7) M, compared with the control (p < 0.05). The rate of increase in the PRL concentration, by 0.02 eq./ml bPP extract, was significantly greater than that in TRH (p < 0.05). Secondly, plasma PRL responses to the intravenous (i.v.) injection of bPP extract (0.5 eq./head), PrRP [3.59 mug/kg body weight (BW)], TRH (1 mug/kg BW), and a dopamine receptor antagonist (sulpiride, 0.1 mg/kg BW), were examined in calves. PrRP failed to stimulate PRL release; however, plasma PRL increased immediately following the injection of bPP extract, TRH and sulpiride. The PRL-releasing effect of i.v. injections of TRH and sulpiride was more potent than that of bPP extract. Finally, plasma PRL responses to the intra-hypothalamic injection of bPP extract were examined in calves. The intra-hypothalamic infusion (arcuate nucleus) of 0.0625 eq./head of bPP extract strongly stimulated PRL release in calves (p < 0.05). The present results show that PP contains a physiologically potent PRF in cattle. 相似文献
16.
An account is given of the development of a new scheme for assessing the relative proportions of nitrogenous end‐products of digestion and metabolism in excreta from laying hens. A series of solvent extractions with methanol‐chloroform‐water, phenol‐acetic acid‐water and lithium carbonate solution removed over 90 per cent of the nitrogen from excreta. In each extract estimations were made of the concentrations of certain nitrogenous components considered to be important such as urate, ammonia, urea, creatine, creatinine and amino acids.
Fractionation of nitrogen in a sample of excreta showed that over half the nitrogen appeared in the methanol‐water extract and about a third in the phenol‐acetic acid‐water extract. About 60 per cent of the extractable nitrogen was derived from urate, about 10 per cent from large non‐dialysable molecules, 9 per cent from ammonia, 2 per cent from free amino acids, possibly 3 per cent from peptides, 2 per cent from urea and 1 per cent from creatine and creatinine. 相似文献
17.
A computer program was devised to extract information about the fertility of bulls from a bovine reproduction data bank used in a dairy herd health program. The data necessary for the analysis was already stored in the data bank so that the cost of performing the calculation arose from the writing of the program, and the subsequent computer time required to run it. 相似文献
18.
从白柳皮中提取分离水杨苷,并通过纯化工艺,制备水杨苷对照品。采用大孔树脂分离、正丁醇萃取、重结晶方法从白柳皮中提取水杨苷,经熔点和比旋度测定、元素分析、红外光谱、液相色谱-质谱联用和核磁共振谱进行水杨苷的鉴别,并采用HPLC-UV进行水杨苷纯度测定。结果表明其含量为99.19%,纯度大于99%,符合中药标准品(供含量测定用)的要求。 相似文献
19.
20.
奶牛Y精子膜蛋白的提取与鉴定为深入研究Y精子特异膜蛋白在受精过程中的作用，开发经济、安全、高效的奶牛性别控制方法具有重要意义。本研究采用超声波破碎法将精子膜与精子分离，分离后的精子膜粗品采用蔗糖密度梯度离心法进行纯化。纯化的精子膜经膜蛋白提取液（去污剂）提取，透析浓缩。经变性聚丙烯酰胺凝胶电泳（SDS—PAGE）银盐染色，成功地提取到膜蛋白。BIO—RAD凝胶成像分析仪分析得知Y精子膜蛋白至少有10种，分子量范围为7．94KD-166．65KD，其中尤以15KD的蛋白含量最多。 相似文献