共查询到20条相似文献,搜索用时 109 毫秒
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在高中《生物》必修本第84页关于脂类代谢的叙述中,指出“脂肪分解为甘油和脂肪酸,然后直接氧化分解生成二氧化碳和水,或者转变为肝糖原等”。对此,学生提出质疑:甘油和脂肪酸是否都能转变为肝糖原?其实,早就有实验证据证明,只有甘油能在动物细胞中能转变为肝糖原或葡萄糖,而脂肪酸却不能。脂肪分解形成的甘油或脂肪组织中的脂肪分解形成的由血液输送到肝脏内的甘油,经活化生成a一磷酸甘油,脱氢转变成磷酸二羟丙酮,再异构并逆酵解途径异生成葡萄糖或糖原。不过甘油只占脂肪总量的极小部分,大部分是脂肪酸。脂肪酸在动物细胞内… 相似文献
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余萍 《岳阳职业技术学院学报》2010,25(1):71-72
糖原累积病Ⅰ型为常染色体隐性遗传病,多发生于婴幼儿和青少年。本病系先天性肝、肾等组织中缺乏葡萄糖-6-磷酸酶所致。细胞核内糖原累积、肝脂肪变性明显但无纤维化改变是本型突出的病理变化。本病诊断分型的主要依据是肝穿刺新鲜组织酶活性检测。 相似文献
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<正> 高中生物必修课本(人教版)第一册第二章"生命活动的基本单位——细胞"中有很多知识点,学生在学习过程中易陷入理解上的误区,现归纳如下:误解一:认为没有细胞壁的细胞一定是动物细胞动物细胞没有细胞壁,这是大家都知道的,但除动物细胞外,还有一些生物细胞也没有细胞壁,如支原体,在生物分类学上它不属于动物。误解二:认为只有动物细胞才具有中心体中心体不仅存在于动物细胞中,还存在于低等植 相似文献
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史喆 《试题与研究:高中理科综合》2021,(31)
梳理新教材人教版必修1动物细胞有丝分裂和必修 2 动物细胞减数分裂在纺锤丝与星射线的表述上存在不一致的原因,解决教学中对此描述而产生的困惑。 相似文献
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Hui-yu ZHANG Yu-nan ZHAO Zhong-li WANG Yu-fang HUANG 《Journal of Zhejiang University. Science. B》2015,(1):62-69
探讨慢性皮质酮(CORT)注射对脑糖原水平以及小鼠抑郁样行为的影响。 相似文献
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1 教材分析与教学设想
在人教版化学必修2第三章第四节"基本营养物质"中,已了解糖类中的具体物质和分类,了解了双糖和多糖的水解,但没有突出糖类的共同特征.已学习过葡萄糖的分子式,了解过它的结构式,并在实验基础上认识了它的特征反应,如葡萄糖在碱性和加热条件下,可与新制的Cu(OH)2悬浊液反应生成砖红色沉淀,葡萄糖能与银氨溶液反应生成银镜等,但没有做银镜反应实验,也没有进一步书写相关的化学反应方程式,没有在实验基础上推导其结构式,没有学习葡萄糖在现实生活中的存在和对人体生理功能的意义.而在人教版化学选修5中第四章第二节<糖类>中,将继续学习葡萄糖和果糖的结构与性质的差异. 相似文献
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Liu Y Wang Q Pan YB Gao ZJ Liu YF Chen SH 《Journal of Zhejiang University. Science. B》2008,9(1):44-50
Resistin, a newly discovered peptide hormone mainly secreted by adipose tissues, is present at high levels in serum of obese mice and may be a potential link between obesity and insulin resistance in rodents. However, some studies of rat and mouse models have associated insulin resistance and obesity with decreased resistin expression. In humans, no relationship between resistin level and insulin resistance or adiposity was observed. This suggests that additional studies are necessary to determine the specific role of resistin in the regulation of energy metabolism and adipogenesis. In the present study, we investigated the effect of resistin in vivo on glucose and lipid metabolism by over-expressing resistin in mice by intramuscular injection of a recombinant eukaryotic expression vector pcDNA3.1-Retn encoding porcine resistin gene. After injection, serum resistin and serum glucose (GLU) levels were significantly increased in the pcDNA3.1-Retn-treated mice; there was an obvious difference in total cholesterol (TC) level between the experiment and the control groups on Day 30. In pcDNA3.1-Retn-treated mice, both free fatty acid (FFA) and high density lipoprotein (HDL) cholesterol levels were markedly lower than those of control, whereas HDL cholesterol and triglyceride (TG) levels did not differ between the two groups. Furthermore, lipase activity was expressly lower on Day 20. Our data suggest that resistin over-expressed in mice might be responsible for insulin resistance and parameters related to glucose and lipid metabolism were changed accordingly. 相似文献
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铁-邻菲罗啉分光光度法测定微量葡萄糖 总被引:4,自引:0,他引:4
在碱性条件下,建立了测定样品中微量葡萄糖的分光光度法,基于葡萄糖的还原性,用糖将Ag^ 还原为Ag,生成的Ag将Fe^3 还原为Fe^2 ,Fe^2 在pH=4.5的介质中与邻菲罗啉(o-phell)反应形成桔红色络合物,在510nm波长处有一最大吸收。 相似文献
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综合论述了葡萄糖电还原反应机理的研究进展,着重介绍了Tse-chuan Chou建立的葡萄糖电还原反应机理及数学模型。 相似文献
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Arbutin was synthesized from glucose by two-step reaction below: (a) 2,3,4,6-tetra-O-acetyl-α-D-glucosyl chloride or bromide was prepared by glucose and acetyl halide (chloride or bromide), (b) 2,3,4,6-tetra-O-ace-tyl-α-D-glucosyl halide (Cl, Br) reacted with hydroquinone, methanol as solvent at pH=9.5-10.0. 相似文献
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Arbutin was synthesized from glucose by two-step reaction below: (a) 2,3,4,6-tetra-O-acetyl-α-D-glucosyl chloride or bromide was prepared by glucose and acetyl halide (chloride or bromide). (b) 2,3,4,6-tetra-O-ace tyl-α-D-glucosyl halide (Cl, Br) reacted with hydroquinone, methanol as solvent at pH=9.5~10.0. 相似文献
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Li-qin Wang Yu He Hao-fang Wan Hui-fen Zhou Jie-hong Yang Hai-tong Wan 《Journal of Zhejiang University. Science. B》2017,18(7):586-596
This study investigated the protective effect of the compatibility of hypaconitine (HA) and glycyrrhetinic acid (GA) on H9c2 cells under oxygen and glucose deprivation (OGD)-induced injury, and the possible mechanisms. We found that HA+GA significantly improved pathology and morphology of the nucleus and ultrastructure of H9c2 cells under OGD as determined by Hoechst 33342 staining and transmission electron microscopy (TEM) tests. It also reduced the releases of lactate dehydrogenase (LDH), creatine kinase-myocardial band isoenzyme (CK-MB), and aspartate transaminase (AST) from the cultured supernatant of H9c2 cells, which were tested by enzyme-linked immune sorbent assay (ELISA) kits. In addition, it lessened the apoptotic rate as determined by a fluorescein isothiocyanate-annexin V/propidium iodide (FITC-AV/PI) double staining assay. It was also found that HA+GA might regulate the protein expression associated with the phosphatidylinositol 3-kinase (PI3K)/Akt signaling pathway. Overall, the study demonstrated that HA+GA protected H9c2 cells against OGD-induced injury, and the signaling mechanism might be related to the PI3K/Akt signaling pathway. 相似文献