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淤泥深度对水体中磷营养因子的影响 被引量:1
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作者 郁桐炳 沈丽红 《内陆水产》 2005年第11期26-27,共2页
通过对不同淤泥深度水质环境中磷营养因子的测定和分析,初步研究了不同深度淤泥对水质环境中磷营养因子的影响。实验结果表明,有淤泥类水族箱水中的磷酸盐浓度与无淤泥类水族箱水中磷酸盐浓度有显著差异(P<0.05)。养殖水体需要一定... 通过对不同淤泥深度水质环境中磷营养因子的测定和分析,初步研究了不同深度淤泥对水质环境中磷营养因子的影响。实验结果表明,有淤泥类水族箱水中的磷酸盐浓度与无淤泥类水族箱水中磷酸盐浓度有显著差异(P<0.05)。养殖水体需要一定厚度的淤泥来维持和缓冲水体中各营养盐水平。 展开更多
关键词 淤泥 水质 磷营养因子 养殖水体 营养因子 泥深 水质环境 盐浓度 水族箱
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基于BDNF/CREB信号通路探讨巴戟天对慢性应激抑郁大鼠海马神经元损伤的影响 被引量:4
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作者 王钦 刁丽梅 蔡萧君 《中华中医药学刊》 CAS 北大核心 2024年第2期69-74,I0017,共7页
目的研究巴戟天对慢性应激抑郁大鼠海马神经元损伤及脑源性神经营养因子(brain-derived neurotrophic factor,BDNF)/细胞内环磷腺苷效应元件结合蛋白(cyclic adenosine phosphate response element binding protein,CREB)信号通路的影... 目的研究巴戟天对慢性应激抑郁大鼠海马神经元损伤及脑源性神经营养因子(brain-derived neurotrophic factor,BDNF)/细胞内环磷腺苷效应元件结合蛋白(cyclic adenosine phosphate response element binding protein,CREB)信号通路的影响。方法从40只SD大鼠随机选取其中10只为正常组,对其余大鼠构建慢性不可预知温和应激模型后,再将其分为3组,即模型组,盐酸氟西汀组(3.17 mg·kg^(-1)),巴戟天组(3.17 g·kg^(-1))。持续灌胃后给药8周,1次/d,并先后在造模前、造模后和给药后开展了行为学实验,以判断大鼠的抑郁情况。通过苏木素-伊红染色(hematoxylin-eosin staining,HE)研究大鼠海马形态学改变,用免疫组织化学法(Immunohistochemistry,IHC)测定大鼠海马BDNF蛋白表达,用HE染色研究大鼠海马组织病理损伤并评分,用实时荧光定量聚合酶链式反应(Real-time PCR,RT-PCR)测定大鼠海马BDNF、TrkB、CREB mRNA相对表达,用蛋白免疫印迹法(western blot,WB)测定大鼠海马BDNF、TrkB、CREB蛋白的相对表达。结果与正常组比较,模型组大鼠活动总路程显著减少(P<0.05),自主游泳时间显著减少(P<0.05),悬尾挣扎时间显著减少(P<0.05)。HE染色结果中表明海马神经元组织受到破坏,病理损伤评分显著下降(P<0.05),免疫组织化学染色中海马BDNF表现显著下降(P<0.05),BDNF、TrkB、CREB mRNA的基因相对表达显著下降(P<0.05);与模型组对比,盐酸氟西汀组和巴戟天组大鼠活动的总里程明显提高(P<0.05),自主游泳时间显著增加(P<0.05),悬尾挣扎时间显著增加(P<0.05),HE染色结果表明海马神经元组织明显复原,病理损伤评分增加(P<0.05),免疫组织化学染色中BDNF表现显著增加(P<0.05),BDNF、TrkB、CREB mRNA的基因相对表达明显增加(P<0.05)。结论经慢性应激刺激后,巴戟天可能通过激活BDNF/TrkB/CREB信号通路对抑郁大鼠海马神经元损伤发挥神经保护作用,改善其抑郁样行为。 展开更多
关键词 巴戟天 抑郁 海马 脑源性神经营养因子(BDNF)/环腺苷效应元件结合蛋白(CREB) 机制研究
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Chemical and Functional Properties of Full Fat and Defatted White Melon (Cucumeropsis mannii) Seed Flours
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作者 Eunice Moriyike Ogunbusola Tayo Nathaniel Fagbemi Oluwatooyin Faramade Osundahunsi 《Journal of Food Science and Engineering》 2012年第12期691-696,共6页
Cucumeropsis mannii, an underutilized oil seed was processed into raw full fat and defatted seed flours and its chemical, functional properties and anti-nutritional factors were determined using standard techniques. T... Cucumeropsis mannii, an underutilized oil seed was processed into raw full fat and defatted seed flours and its chemical, functional properties and anti-nutritional factors were determined using standard techniques. The effects of sample concentration and pH on the foaming properties of the seed flours were determined. The results showed that the full fat and defatted seed flours contained the following in g/100 g sample; 5.0 and 5.1; 45.8 and 1.0; 39.4 and 78.7; 3.45 and 4.40; 1.50 and 3.05; 4.85 and 7.75 for moisture, crude fat, protein, ash, crude fibre and carbohydrate, respectively. The most abundant mineral elements in the seed flour (mg/100 g) are potassium (198.5), followed by nickel (30.0) and magnesium (28.4). The water absorption capacity, oil absorption capacity, foaming capacity and stability, least gelation concentration, emulsion capacity and bulk density are 55.5% and 125.0%; 128.8% and 184.0%; 10.5% and 17.0%; 3.0% and 1.5%; 16.0% and 10.0 g/mL; 85.0 and 115.0 mL/g; 0.42 and 0.25 g/mL, respectively. Defatting influenced the functional properties. The foaming capacity is dependent on sample concentration and pH. The protein solubility of the full fat and defatted seed flours was minimum between pH 3 and 4 and maximum at pH 11. The anti-nutritional composition of the seed flour revealed the following: tannic acid, 1.54 mg/100 g; phytin phosphorus, 0.70 rag/g; phytic acid, 2.48 mg/g; oxalate, 1.85 mg/g; alkaloids 1.97% and saponin 0.50%. The seed flours (full fat and defatted) have potential as nutrient supplement, thickeners and emulsifiers in food system. 展开更多
关键词 Cucumeropsis mannii full fat defatted chemical and functional properties.
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