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A wheat germ-rich diet preserves bone homeostasis by regulating gut microbiota and plasma metabolites in aged rats
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作者 Luanfeng Wang Zebin Weng +8 位作者 Tong Chen Yu Li Ling Xiong Haizhao Song Fang Wang Xiaozhi Tang Bo Ren Xuebo Liu Xinchun Shen 《Food Science and Human Wellness》 SCIE CAS CSCD 2024年第6期3582-3594,共13页
Bone loss caused by ageing has become one of the leading health risk factors worldwide.Wheat germ(WG)is consists of high amounts of bioactive peptides,polyunsaturated fatty acids,and dietary fibre.Currently,WG has bee... Bone loss caused by ageing has become one of the leading health risk factors worldwide.Wheat germ(WG)is consists of high amounts of bioactive peptides,polyunsaturated fatty acids,and dietary fibre.Currently,WG has been proven to possess strong antioxidant and anti-infl ammatory properties.We recently explored the beneficial effects and relevant mechanisms of a WG-rich diet(2.5%and 5%WG,m/m)on bone homeostasis in aged rats.Our results showed that 5%WG supplementation for 12 months effectively attenuated ageing-induced microstructural damage and differentiation activity changes in the femur.The 5%WG supplementation also signifi cantly increased the levels of total antioxidant capacity(T-AOC),glutathione peroxidase(GSH-Px)(P<0.01),and superoxide dismutase(SOD)(P<0.05),and decreased infl ammatory cytokine levels(tumor necrosis factor-α(TNF-α)and interleukin-6(IL-6))(P<0.01).Furthermore,the WG-rich diet reshaped the composition of the gut microbiota,enhancing short-chain fatty acids(SCFAs)-producing microbes and reducing infl ammation-related microbes.In addition,metabolomics analysis showed that 5%WG supplementation improved plasma metabolites related to bone metabolism.Conclusively,our study purports long-term WG-rich diet may preserve bone homeostasis by regulating gut microbiota and plasma metabolites in aged rats. 展开更多
关键词 Wheat germ Bone homeostasis Gut microbiota METABOLITES Ageing
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Calcium intake,calcium homeostasis and health 被引量:5
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作者 Fan Pu Ning Chen Shenghui Xue 《Food Science and Human Wellness》 SCIE 2016年第1期8-16,共9页
Calcium,as the most abundant mineral in human body,is involved in many physiological and pathological processes.Here,we reviewed the key mechanisms of calcium homeostasis,including calcium sensing receptor regulation,... Calcium,as the most abundant mineral in human body,is involved in many physiological and pathological processes.Here,we reviewed the key mechanisms of calcium homeostasis,including calcium sensing receptor regulation,intestinal calcium absorption,renal calcium reabsorption and bone calcium resorption.We further discussed the roles of dietary calcium and vitamin D in diseases associated with dysfunctional regulation of calcium.However,the over-dosed consumption of calcium could increase the risks for a series of diseases,such as kidney stone,myocardial infarction and stroke. 展开更多
关键词 homeostasis INTAKE VITAMIN
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Internal connections between dietary intake and gut microbiota homeostasis in disease progression of ulcerative colitis:a review 被引量:7
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作者 Wen Zeng Dong He +5 位作者 Yifan Xing Junyu Liu Nan Su Chong Zhang Yi Wang Xinhui Xing 《Food Science and Human Wellness》 SCIE 2021年第2期119-130,共12页
Ulcerative colitis(UC)is a chronic systematic inflammation disorder with increasing incidence,unknown pathogenesis,limited drug treatment,and abundant medical expenses.Dietary intake,as a daily indispensable environme... Ulcerative colitis(UC)is a chronic systematic inflammation disorder with increasing incidence,unknown pathogenesis,limited drug treatment,and abundant medical expenses.Dietary intake,as a daily indispensable environment factor,is closely related to UC pathogenesis and prevention.The underlying interactions between dietary intake and UC progression are implicated with the modulation of gut microbiome as well as microbial metabolites,suggesting the complex and systematic characteristics of UC.However,the triangular relationships with dietary intake,gut microbiota homeostasis,and UC have not been well summarized so far.Here we review the recent studies of dietary intake on the regulation of gut microbiome homeostasis as well as modulation of UC progression.These findings suggest that varieties in dietary patterns result in the production of diverse microbial fermentation metabolites,which contribute to gut microbiome homeostasis through multiple manipulations including immune modulation,inftammation restriction as well as epithelial barrier maintenance,thus finally determine the fate of UC progression and give implications for functional food development for prevention and treatment of UC patients. 展开更多
关键词 Ulcerative colitis Dietary intake Gut microbiome METABOLITE homeostasis
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Theasinensin A attenuated diabetic development by restoring glucose homeostasis, improving hepatic steatosis and modulating gut microbiota in high-fat-diet/streptozotocin-induced diabetic mice 被引量:2
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作者 Weiqi Xu Yujie Huang +6 位作者 Wangting Zhou Yujia Peng Xuhui Kan Wei Dong Guijie Chen Xiaoxiong Zeng Zhonghua Liu 《Food Science and Human Wellness》 SCIE CSCD 2023年第6期2073-2086,共14页
Theasinensin A(TSA),a dimer of epigallocatechin gallate,has been preliminarily demonstrated to have hypoglycemia and anti-inflammatory effects.However,little information is available on its potential mechanisms of ant... Theasinensin A(TSA),a dimer of epigallocatechin gallate,has been preliminarily demonstrated to have hypoglycemia and anti-inflammatory effects.However,little information is available on its potential mechanisms of anti-diabetes.Therefore,the present study aimed to investigate the influence of TSA on glucose and lipid metabolism and gut microbiota in high-fat-diet/streptozotocin-induced diabetic mice.As result,TSA improved polydipsia,polyphagia and impaired glucose tolerance of diabetic mice,declined the fasting blood glucose and hepatic triglyceride level,and enhanced the expression at mRNA level of insulin receptor substrate,phosphoinositide 3-kinase,protein kinase B and glucagon-like peptide 1 receptor(GLP-1R)in the diabetic liver.Moreover,TSA could restore the disorder of gut microbiota of diabetic mice.High-dose(100 mg/kg)TSA showed better benefi cial effects from the blood biochemical parameters,hepatic function and gut microbiota.In general,high-dose TSA significantly modulated gut microbiota by increasing the relative abundance of Akkermansia and decreasing the relative abundances of Acetatifactor,Anaerotruncus,Pseudofl avonifactor,Oscillibacter and Clostridium clusters.The results indicated that TSA could exert an anti-diabetes effect in diabetic mice through restoring glucose homeostasis,declining hepatic steatosis,activating insulin and GLP-1 signaling pathways,and ameliorating gut microbiota dysbiosis. 展开更多
关键词 TEA Theasinensin A Diabetes Glucose homeostasis Gut microbiota Hepatic steatosis
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Nanoplatforms for Sepsis Management: Rapid Detection/Warning, Pathogen Elimination and Restoring Immune Homeostasis 被引量:1
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作者 Gan Luo Jue Zhang +5 位作者 Yaqi Sun Ya Wang Hanbin Wang Baoli Cheng Qiang Shu Xiangming Fang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2021年第6期31-94,共64页
Sepsis,a highly life-threatening organ dysfunction caused by uncontrollable immune responses to infection,is a leading contributor to mortality in intensive care units.Sepsis-related deaths have been reported to accou... Sepsis,a highly life-threatening organ dysfunction caused by uncontrollable immune responses to infection,is a leading contributor to mortality in intensive care units.Sepsis-related deaths have been reported to account for 19.7%of all global deaths.However,no effective and specific therapeutic for clinical sepsis management is available due to the complex pathogenesis.Concurrently eliminating infections and restoring immune homeostasis are regarded as the core strategies to manage sepsis.Sophisticated nanoplatforms guided by supramolecular and medicinal chemistry,targeting infection and/or imbalanced immune responses,have emerged as potent tools to combat sepsis by supporting more accurate diagnosis and precision treatment.Nanoplatforms can overcome the barriers faced by clinical strategies,including delayed diagnosis,drug resistance and incapacity to manage immune disorders.Here,we present a comprehensive review highlighting the pathogenetic characteristics of sepsis and future therapeutic concepts,summarizing the progress of these well-designed nanoplatforms in sepsis management and discussing the ongoing challenges and perspectives regarding future potential therapies.Based on these state-of-the-art studies,this review will advance multidisciplinary collaboration and drive clinical translation to remedy sepsis. 展开更多
关键词 SEPSIS Nanoplatform DETECTION Immune homeostasis
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Dendrobium species regulate energy homeostasis in neurodegenerative diseases: a review 被引量:1
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作者 Feixuan Wang Jingqiong Wan +3 位作者 Yangzhen Liao Shangyu Liu Yuan Wei Zhen Ouyang 《Food Science and Human Wellness》 SCIE CSCD 2023年第6期2151-2174,共24页
Brain energy homeostasis is a vital physiological function in maintaining a balanced internal metabolic environment.The impairment of energy homeostasis is recognized as a key pathophysiological basis for brain metabo... Brain energy homeostasis is a vital physiological function in maintaining a balanced internal metabolic environment.The impairment of energy homeostasis is recognized as a key pathophysiological basis for brain metabolic disorders and related neurodegenerative diseases.Dendrobium species(‘Shihu’in Chinese)such as D.officinale,D.huoshanense,D.nobile,D.chrysanthum,D.loddigesii,D.moniliforme,D.gratiosissimum,D.candidum and D.caulis are widely used as traditional Chinese medicines/nutraceuticals to control and treat neurodegenerative disorders.These dietary herbs and their derived compounds possess a variety of biological properties,such as suppression of oxidative stress and neuroinflammation,regulation of energy homeostasis mainly through improving brain mitochondria function,insulin signaling and lipid metabolism.Furthermore,they reduce neurotoxicity,alleviate brain injury and neuropathy,and prevent neurodegenerative conditions including stroke,Alzheimer’s disease,Parkinson’s disease,and Huntington’s disease in humans and/or rodents.Moreover,the nutraceuticals from Dendrobium species promote gut health and aid digestion,which appear to be associated with beneficial effects on brain energy homeostasis.Based on the above-mentioned health benefits associated with Dendrobium species,this work reviews their nutraceutical role in neurodegenerative disorders and further suggests the need to elucidate mechanisms of the underlying molecular actions. 展开更多
关键词 Dendrobium species Nutraceutical role Energy homeostasis Neurodegenerative diseases
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Energy metabolism homeostasis in cardiovascular diseases
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作者 Lu-Yun WANG Chen CHEN 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2021年第12期1044-1057,共14页
Cardiovascular disease(CVD)is the leading cause of morbidity and mortality in the general population.Energy metabolism disturbance is one of the early abnormalities in CVDs,such as coronary heart disease,diabetic card... Cardiovascular disease(CVD)is the leading cause of morbidity and mortality in the general population.Energy metabolism disturbance is one of the early abnormalities in CVDs,such as coronary heart disease,diabetic cardiomyopathy,and heart failure.To explore the role of myocardial energy homeostasis disturbance in CVDs,it is important to understand myocardial metabolism in the normal heart and their function in the complex pathophysiology of CVDs.In this article,we summarized lipid metabolism/lipotoxicity and glucose metabolism/insulin resistance in the heart,focused on the metabolic regulation during neonatal and ageing heart,proposed potential metabolic mechanisms for cardiac regeneration and degeneration.We provided an overview of emerging molecular network among cardiac proliferation,regeneration,and metabolic disturbance.These novel targets promise a new era for the treatment of CVDs. 展开更多
关键词 METABOLISM homeostasis DEGENERATION
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Leaf C:N:P stoichiometric homeostasis of a Robinia pseudoacacia plantation on the Loess Plateau
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作者 Zhuoxia Su Bingqian Su +1 位作者 Shenglin Mao Zhouping Shangguan 《Journal of Forestry Research》 SCIE CAS CSCD 2023年第4期929-937,共9页
Homeostasis is the adaptability of a species to a changing environment.However,the ecological stoichiometric homeostasis of Robinia pseudoacacia L.in diff erent climatic regions is poorly understood but could provide ... Homeostasis is the adaptability of a species to a changing environment.However,the ecological stoichiometric homeostasis of Robinia pseudoacacia L.in diff erent climatic regions is poorly understood but could provide insights into its adaptability in the loess hilly region.This study sampled 20 year-old R.pseudoacacia plantations at 10 sites along a north–south transect on the Loess Plateau.Variations in the ecological stoichiometric characteristics of leaf and soil carbon,nitrogen,and phosphorus were analysed and homeostatic characteristics of leaf ecological stoichiometric parameters in diff erent climates were identifi ed.Factors aff ecting leaf stoichiometry were assessed.The results show that R.pseudoacacia leaves were rich in nitrogen and defi cient in phosphorous during tree growth and development.Nitrogen and phosphorous levels in the soils of the loess region were lower than the average in soils in the rest of China.All ecological stoichiometric parameters of R.pseudoacacia leaves in two diff erent climates were considered“strictly homeostasis”.Precipitation,available phosphorus,and soil C:P were the main factors aff ecting the variation of C:N:P stoichiometry of R.pseudoacacia leaves.R.pseudoacacia in the loess hilly region has strong ecologically homeostatic characteristics and suggests that it is well-adapted to the area. 展开更多
关键词 Loess Plateau Robinia pseudoacacia Ecological stoichiometry homeostasis
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The microbiome and gut homeostasis
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作者 Jee-Yon Lee 《四川生理科学杂志》 2022年第6期1092-1092,共1页
Changes in the composition of the gut microbiota are associated with many human diseases.So far,however,we have failed to define homeostasis or dysbiosis by the presence or absence of specific microbial species.The co... Changes in the composition of the gut microbiota are associated with many human diseases.So far,however,we have failed to define homeostasis or dysbiosis by the presence or absence of specific microbial species.The composition and function of the adult gut microbiota is governed by diet and host factors that regulate and direct microbial growth. 展开更多
关键词 homeostasis species. governed
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NH_4^+对K^+在土壤肥际微域中迁移和转化的影响 被引量:10
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作者 杜振宇 周健民 +2 位作者 王火焰 杜昌文 陈小琴 《土壤学报》 CAS CSCD 北大核心 2007年第3期492-498,共7页
NH4+和K+共施在农田施肥中是很普遍的现象,研究它们共施后二者在土壤中的交互作用对指导施肥具有重要意义。采用室内土柱实验研究了共施条件下NH4+对K+在红壤和潮土肥际微域中的迁移和形态转化的影响,供试肥料为NH4Cl和KCl。试验结果表... NH4+和K+共施在农田施肥中是很普遍的现象,研究它们共施后二者在土壤中的交互作用对指导施肥具有重要意义。采用室内土柱实验研究了共施条件下NH4+对K+在红壤和潮土肥际微域中的迁移和形态转化的影响,供试肥料为NH4Cl和KCl。试验结果表明,与单施K+相比,共施NH4+没有改变肥料钾在红壤和潮土中的迁移距离,但提高了肥际微域中的水溶性钾含量;在靠近施肥点附近,NH4+的施用减少了土壤交换性钾含量,这种作用在潮土中的表现不如在红壤中明显;与单施KCl相比,共施NH4Cl明显降低了施肥点附近土壤微域内的非交换性钾含量。研究结果表明,共施NH4Cl减少了土壤晶格对钾离子的固定,增加了钾的淋溶风险。 展开更多
关键词 NH4^+ K^+ 红壤 潮土 迁移 转化
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K^+高亲和转运系统吸收动力学特征及其受NH_4^+影响的研究 被引量:13
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作者 孙小茗 封克 汪晓丽 《植物营养与肥料学报》 CAS CSCD 北大核心 2007年第2期208-212,共5页
为探讨钾的高亲和转运系统是否受到铵离子的影响,采用溶液培养方法研究了水稻、大豆两种作物苗期(16d)的K+高亲和转运系统吸收动力学特征及其受吸收液中NH4+的影响。结果表明,NH4+对K+吸收的Vmax的影响在作物种类间有较大的差异,水稻受... 为探讨钾的高亲和转运系统是否受到铵离子的影响,采用溶液培养方法研究了水稻、大豆两种作物苗期(16d)的K+高亲和转运系统吸收动力学特征及其受吸收液中NH4+的影响。结果表明,NH4+对K+吸收的Vmax的影响在作物种类间有较大的差异,水稻受影响显著小于大豆。NH4+对供试作物K+吸收的Km值影响均很小,说明NH4+对K+吸收速率的影响主要在于影响了细胞膜上K+载体的数量而非影响了载体吸收位点与K+之间的亲和性。 展开更多
关键词 K^+高亲和转运系统 水稻 大豆 K^+ NH4^+ 吸收动力学
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K^+与PVA协同作用对膨胀土水化膨胀的抑制作用 被引量:9
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作者 于进庆 胡瑞林 +2 位作者 尚海敏 崔芳鹏 杨明亮 《岩土工程学报》 EI CAS CSCD 北大核心 2008年第6期900-905,共6页
从晶层膨胀与渗透膨胀的微观角度分析了膨胀土的水化膨胀机理,在此基础上提出了以抑制水化膨胀和减少环境负担为目的的K+与聚乙烯醇(PVA)合成剂。通过自由膨胀率试验、颗分试验与水化崩解试验证实K+与PVA能产生协同抑制作用,可有效降低... 从晶层膨胀与渗透膨胀的微观角度分析了膨胀土的水化膨胀机理,在此基础上提出了以抑制水化膨胀和减少环境负担为目的的K+与聚乙烯醇(PVA)合成剂。通过自由膨胀率试验、颗分试验与水化崩解试验证实K+与PVA能产生协同抑制作用,可有效降低膨胀土的自由膨胀率、改善其粒度成分并提高其水稳性,而0.6%的PVA溶液与7%KCl溶液组合被认为是一种经济合理的配比选择。 展开更多
关键词 晶层膨胀 渗透膨胀 PVA K^+ 协同作用
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渗透胁迫对玉米幼苗根系活力和K^+吸收动力学特征的影响 被引量:12
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作者 王晓琴 袁继超 +2 位作者 柯永培 刘从军 熊庆娥 《植物营养与肥料学报》 CAS CSCD 北大核心 2005年第1期27-32,共6页
本试验以三个抗旱性不同的玉米品种作为试验材料,以26%聚乙二醇Polyethylene glycol(PEG)(分子量4000)溶液对幼苗进行模拟渗透胁迫,研究了渗透胁迫对3个抗旱性不同的玉米品种幼苗根系活力及对K+吸收的动力学的影响。结果表明,玉米幼苗... 本试验以三个抗旱性不同的玉米品种作为试验材料,以26%聚乙二醇Polyethylene glycol(PEG)(分子量4000)溶液对幼苗进行模拟渗透胁迫,研究了渗透胁迫对3个抗旱性不同的玉米品种幼苗根系活力及对K+吸收的动力学的影响。结果表明,玉米幼苗根系对K+的吸收速度符合Michaelis-Menten动力学方程;短期(24h内)的渗透胁迫可在一定程度上促进根系的生长,根系活力增强,NR活力升高,根系与离子的亲和力增加(Km下降),抗旱性强的品种促进程度大于抗旱性弱的品种;较长时间(超过48h)的渗透胁迫则抑制根系的生长,根系活力、NR活性等降低,根系与离子的亲和力下降(Km升高)。抗旱性强的品种受抑程度轻,Km值的升幅小,而抗旱性弱的品种受抑程度重,Km值的升幅大。玉米幼苗根系吸收K+的Km与根数、根重、根系活力、吸收面积、NR活力等极显著相关,可作为玉米抗旱性强弱的指标。 展开更多
关键词 渗透胁迫 玉米 根系活力 K^+吸收动力学参数
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K^+型无铅鸡蛋皮蛋加工技术 被引量:10
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作者 张献伟 郭善广 +1 位作者 蒋爱民 李远志 《食品科学》 EI CAS CSCD 北大核心 2011年第14期350-355,共6页
以新鲜鸡蛋为试材,采用浸泡法加工工艺,探讨KOH对加工鸡蛋皮蛋中蛋清、蛋黄的pH值、色泽及TPA(texture profile analysis)等质量特性的影响及其可能作用机理,旨在为研发K+型鸡蛋皮蛋提供依据。研究表明,5.5%KOH处理的皮蛋,在感官品质及... 以新鲜鸡蛋为试材,采用浸泡法加工工艺,探讨KOH对加工鸡蛋皮蛋中蛋清、蛋黄的pH值、色泽及TPA(texture profile analysis)等质量特性的影响及其可能作用机理,旨在为研发K+型鸡蛋皮蛋提供依据。研究表明,5.5%KOH处理的皮蛋,在感官品质及质构特性方面较为理想。 展开更多
关键词 K^+无铅皮蛋 腌制液碱度 色泽 质构特性
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NaCl胁迫对海滨木槿种子萌发及Na^+、K^+含量的影响 被引量:12
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作者 薄鹏飞 孙秀玲 +2 位作者 宋杰 杜希华 薛庆荣 《安徽农业科学》 CAS 北大核心 2008年第8期3098-3100,共3页
[目的]探索不同浓度NaCl处理对海滨木槿种子萌发及种皮和种胚中Na+、K+含量的影响。[方法]用NaCl浓度分别为0、50、100、150、200mmol/LNaCl的1/4Hoagland营养液培养材料,培养5、10d后以FP-640火焰分光光度计测定种皮和胚中的Na+、K+含... [目的]探索不同浓度NaCl处理对海滨木槿种子萌发及种皮和种胚中Na+、K+含量的影响。[方法]用NaCl浓度分别为0、50、100、150、200mmol/LNaCl的1/4Hoagland营养液培养材料,培养5、10d后以FP-640火焰分光光度计测定种皮和胚中的Na+、K+含量;培养15d后,将含有NaCl的营养液未萌发的种子分别转入1/4Hoagland培养液继续培养,测定解除盐胁迫后种子萌发的恢复率。[结果]随着培养液中NaCl浓度的升高,海滨木槿种子的萌发率逐渐降低,在NaCl浓度为200mmol/L时种子的萌发率最低。种皮和胚中Na+含量随着培养液中NaCl浓度的升高和处理天数的延长而增大;在相同的盐浓度下,胚中Na+含量明显低于种皮。随着培养液中NaCl浓度的升高,种皮中K+含量逐渐升高,胚中K+含量逐渐降低,但胚中K+含量明显高于种皮。种皮和胚中Na+/K+随着NaCl浓度的升高而增大,胚中Na+/K+明显低于种皮。[结论]海滨木槿的种皮是阻挡Na+进入种子的一道屏障;NaCl处理下胚保持较高含量的K+和较低的Na+/K+可能是海滨木槿种子耐盐的主要原因之一。 展开更多
关键词 海滨木槿 盐胁迫 种子萌发 NA^+ K^+离子含量
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高等植物K^+吸收及转运的分子机制研究进展 被引量:9
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作者 段慧荣 周学辉 +5 位作者 胡静 段潇蓉 田福平 崔光欣 王春梅 杨红善 《草业学报》 CSCD 北大核心 2019年第9期174-191,共18页
K^+是植物生长必需的营养元素。K^+被植物根系吸收后,有效地向地上部转运,在跨膜转运的过程中主要由次级K^+转运蛋白和K^+通道介导。KT/HAK/KUP和HKT家族是参与植物体内K+吸收及转运的两类主要K+转运蛋白,其中HKT家族参与K^+转运的成员... K^+是植物生长必需的营养元素。K^+被植物根系吸收后,有效地向地上部转运,在跨膜转运的过程中主要由次级K^+转运蛋白和K^+通道介导。KT/HAK/KUP和HKT家族是参与植物体内K+吸收及转运的两类主要K+转运蛋白,其中HKT家族参与K^+转运的成员仅存在于单子叶植物中,它们在植物生长发育、渗透调节等过程中均发挥重要作用。Shaker家族是K^+通道中最早发现且研究最为深入的一类电压门控型通道,是植物K^+吸收的重要途径之一。本研究从结构特征、定位和组织表达、功能调控等方面对植物KT/HAK/KUP家族、HKT家族和Shaker通道进行综述,最后对未来的主要研究方向做了展望。 展开更多
关键词 K^+吸收及转运 KT/HAK/KUP HKT SHAKER
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NH4^-+对不同基因型棉花幼苗K^-+吸收和利用的影响 被引量:5
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作者 王春霞 田晓莉 +3 位作者 张志勇 何钟佩 段留生 李召虎 《植物营养与肥料学报》 CAS CSCD 北大核心 2008年第4期742-748,共7页
在溶液培养条件下研究了NH4+对棉花不同基因型幼苗干物质积累以及K+吸收和利用的影响。结果表明,NH4+在不同供钾条件下均显著降低了棉花幼苗的干重、钾吸收量和钾利用指数,低钾条件下(K+0.03 mmol/L)尤其如此。中等供钾(K+0.5 mmol/L)... 在溶液培养条件下研究了NH4+对棉花不同基因型幼苗干物质积累以及K+吸收和利用的影响。结果表明,NH4+在不同供钾条件下均显著降低了棉花幼苗的干重、钾吸收量和钾利用指数,低钾条件下(K+0.03 mmol/L)尤其如此。中等供钾(K+0.5 mmol/L)在一定程度上缓解了NH4+对棉花幼苗干物质积累以及K+吸收和利用的抑制;充分供钾(K+2.5 mmol/L)却未能在中等供钾的基础上进一步减轻NH4+的毒害作用。鲁棉研22苗期的干物质积累在不同供钾条件下受NH4+影响的程度均较153018品系大,这主要与其体内钾利用能力受NH4+影响较153018大有关。 展开更多
关键词 棉花 幼苗 NH4^+ K^+ 吸收和利用
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脑缺血和NBP预处理对脑缺血沙鼠NGB和mit-Na^+,K^+-ATP酶活性的影响 被引量:11
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作者 张镛 刘振芳 +1 位作者 付庆喜 张晓 《山东医药》 CAS 北大核心 2007年第1期1-2,共2页
目的探讨丁基苯酞(NBP)对脑缺血沙鼠脑红蛋白(NGB)和线粒体N a+,K+-ATP(m it-N a+,K+-ATP)酶活性的影响。方法将蒙古沙鼠66只随机分为假手术组、脑缺血组、NBP预处理组。采用颈总动脉结扎的方法制作脑缺血模型。分别采用免疫组化染色及... 目的探讨丁基苯酞(NBP)对脑缺血沙鼠脑红蛋白(NGB)和线粒体N a+,K+-ATP(m it-N a+,K+-ATP)酶活性的影响。方法将蒙古沙鼠66只随机分为假手术组、脑缺血组、NBP预处理组。采用颈总动脉结扎的方法制作脑缺血模型。分别采用免疫组化染色及化学比色法检测NGB阳性细胞数和m it-N a+,K+-ATP酶活性。结果NBP预处理组NGB表达量在缺血1、10、30 m in时较脑缺血组显著增多(P<0.05);两组在缺血1、5、30、60 m in时m it-N a+,K+-ATP酶活性有统计学差异(P<0.05);NBP预处理组m it-N a+,K+-ATP酶活性与NGB表达量呈负相关(P<0.01)。结论NBP可促进脑缺血时NGB的表达,维持m it-N a+,K+-ATP酶活性。 展开更多
关键词 丁基苯酞 脑红蛋白 线粒体Na^+ K^+-ATP酵 沙土鼠
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罗布麻K^+通道编码基因AvAKT1的克隆与表达分析 被引量:4
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作者 夏曾润 王文颖 +1 位作者 刘亚琪 王锁民 《草业学报》 CSCD 北大核心 2019年第8期180-189,共10页
罗布麻是一种典型的钾高效植物,具有很强的K^+吸收和利用效率,通过增强对K^+的选择性吸收维持体内高且稳定的K^+含量和K^+/Na^+以抵御盐和干旱胁迫。为了探究其分子机制,采用RT-PCR和RACE技术从罗布麻根中克隆得到Shaker家族成员K^+通... 罗布麻是一种典型的钾高效植物,具有很强的K^+吸收和利用效率,通过增强对K^+的选择性吸收维持体内高且稳定的K^+含量和K^+/Na^+以抵御盐和干旱胁迫。为了探究其分子机制,采用RT-PCR和RACE技术从罗布麻根中克隆得到Shaker家族成员K^+通道蛋白基因AvAKT 1,其cDNA全长序列2906 bp,编码899个氨基酸。氨基酸序列分析显示AvAKT1包含Shaker同源蛋白家族典型的6个跨膜域、1个P环以及环核苷酸结合位点(cyclic nucleotide-binding domain,cNBD)、锚蛋白区(ankyrin-related domain,ANKY)和富含疏水酸性残基区(a domain rich in hydrophobic and acidic residues,KHA)保守结构域;系统进化树将Shaker家族分为5个亚族,AvAKT1隶属第Ⅰ亚族(AKT1亚族),与烟草进化关系较近。实时荧光定量PCR分析结果表明,AvAKT 1主要在罗布麻根中表达,在茎和叶中表达量极低;AvAKT 1受5.0 mmol·L^-1 K^+的显著诱导,且在-0.2 MPa渗透胁迫和25 mmol·L^-1 NaCl处理6 h时,在根中的表达水平显著上升。AvAKT 1可能参与调控罗布麻低亲和性K^+吸收过程,并在其应答干旱和盐逆境胁迫中发挥有效作用。 展开更多
关键词 罗布麻 AvAKT1 K^+ 基因克隆 表达分析
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K^+掺杂对TiO_2晶型转变的研究 被引量:4
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作者 李健 闫龙 +3 位作者 亢玉红 马亚军 王玉飞 陈锦中 《化工新型材料》 CAS CSCD 北大核心 2017年第1期202-204,共3页
采用溶胶-凝胶法制备了不同K^+掺杂量的纳米TiO_2粉体,利用差热-热重、X衍射仪研究了不同煅烧温度、不同煅烧时间下K^+掺杂量对TiO_2凝胶相变过程的影响。研究结果表明,提高煅烧温度、延长煅烧时间可有效促进锐钛矿(Anatase)向金红石(Ru... 采用溶胶-凝胶法制备了不同K^+掺杂量的纳米TiO_2粉体,利用差热-热重、X衍射仪研究了不同煅烧温度、不同煅烧时间下K^+掺杂量对TiO_2凝胶相变过程的影响。研究结果表明,提高煅烧温度、延长煅烧时间可有效促进锐钛矿(Anatase)向金红石(Rutile)(A-R)的转变,K+掺杂抑制了锐钛矿向金红石的转变。 展开更多
关键词 二氧化钛 相变 K^+掺杂 溶胶-凝胶法
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