外源褪黑素对干旱胁迫下紫苏种子萌发的影响   总被引：1，自引：0，他引：1  

李爱  李林  孙汪亮  孙锋 《北方园艺》2018,(5):140-144

以紫苏(Perilla frutescens(L.)Britton)为试材,利用聚乙二醇(PEG-6000)模拟干旱胁迫环境,分析不同浓度外源褪黑素对紫苏种子萌发特征(发芽率、发芽势、发芽指数和活力指数)和幼苗生长(根长、子叶长、子叶宽和鲜质量)的影响。结果表明:干旱胁迫下紫苏种子萌发受到显著抑制,经过不同浓度的外源褪黑素处理后,发芽指标明显上升,其中处理T1(10%聚乙二醇+50μmol·L-1褪黑素)各项指标均达到最大值,发芽率为64.00%,发芽势为43.67%,发芽指数为17.62,活力指数为0.065。外施褪黑素同样可以缓解干旱胁迫下紫苏幼苗的生长,其中处理T3(10%聚乙二醇+300μmol·L-1褪黑素)效果最好,幼苗根长为7.45mm,子叶鲜质量为3.53 mg,长宽比为1.260。表明外施一定浓度的褪黑素能有效缓解干旱胁迫对紫苏种子萌发的影响,为干旱环境下紫苏种植栽培提供了参考依据。  相似文献   

森林康养研究进展与产业发展现状   总被引：1，自引：0，他引：1  

朱旻  朱江  艾训儒  郭秋菊  姚兰 《湖北林业科技》2020,49(5):53-59

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配电主站边界数据可靠性测试分析     

谢海彪  艾绍伟 《农村电气化》2021,(3):8-9,22

配电主站边界承担着承上启下的作用,是主站不同区域之间、主站与外部不同系统之间进行数据交互的分界点。所以如何保证边界数据的可靠性是配电主站安全运行的基础。1配电自动化系统主站国内现阶段配电自动化系统主站分为Ⅰ区配电网运行监控和Ⅲ区配电网运行状态管控两个大区,Ⅰ区配电网运行监控主要实现配电网的数据采集、操作与控制、拓扑分析、馈线自动化等功能。Ⅲ区配电网运行状态管控主要实现配电网趋势分析、配电终端管理、信息共享与发布等功能。Ⅰ区与Ⅲ区通过电力专用横向单向安全隔离装置隔离,共同组成配电自动化系统主站。配电自动化主站示意图如图1所示。  相似文献   

In Situ Field-Scale Remediation of Low Cd-Contaminated Paddy Soil Using Soil Amendments     

Lin-feng Li  Shao-ying Ai  Yan-hong Wang  Ming-deng Tang  Yi-Chun Li 《Water, air, and soil pollution》2016,227(9):342

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汞矿区周围环境及畜禽砷、铅、铬污染情况调查     

覃朗  万洁妤  艾淼  施云刚  吴荣华  欧德渊 《贵州畜牧兽医》2015,39(2):7-10

目的:对汞矿周围环境和畜禽进行砷、铅、铬污染调查,为掌握其污染情况提供依据。方法:电感耦合等离子体质谱法(ICP-MS测定。结果:环境中水源污染铅、砷严重,蔬菜、粮食受到不同程度污染;鸡、鸭组织铅污染严重;猪、牛、羊砷、铅污染严重,部分组织受铬轻度污染。结论:汞矿周围环境以及饲养的畜禽存在严重砷、铅污染,轻度铬污染。  相似文献   

平欧杂种榛压条苗生根及生长情况调查研究     

艾婷婷 《防护林科技》2017,(6)

以科尔沁沙地栽培的辽榛3号(84-226)、辽榛7号(82-11)和达维(84-254)平欧杂种榛(Corylus heterophylla Fisch.×Corylus avellana L.)为研究对象,应用自根直立压条法进行苗木繁育,并对繁殖苗的生根情况进行统计分析,结果表明:辽榛7号的生根率最高且生根数量最多;达维的生根基径和压条苗地上部分最佳。综合分析表明,辽榛7号的压条苗生根情况最好;3个品种压条苗均达到一级苗标准,能满足生产需要。  相似文献   

Sulfadiazine pharmacokinetics in grass carp (Ctenopharyngodon idellus) receiving oral and intravenous administrations     

Ning Xu  Yu Fu  Fang Chen  Yongtao Liu  Jing Dong  Yibin Yang  Shun Zhou  Qiuhong Yang  Xiaohui Ai 《Journal of veterinary pharmacology and therapeutics》2021,44(1):86-92

This study aimed to examine the bioavailability (BA) and pharmacokinetic (PK) characteristics of sulfadiazine (SDZ) in grass carp (Ctenopharyngodon idellus) after oral and intravenous administrations. Blood samples were collected at predetermined time points of 0.083, 0.17, 0.5, 1, 2, 4, 8, 16, 24, 48, 72, and 96 hr (n = 6). The samples were extracted and purified by organic reagents and determined by the ultra‐performance liquid chromatography. The software named 3P97 was used to calculate relevant PK parameters. The results demonstrated that the concentration–time profile of SDZ was best described by a one‐compartmental open model with first‐order absorption after a single oral dose. The main PK parameters of the absorption rate constant (K_α), the absorption half‐life (t_{1/2 Kα}), the elimination rate constant (K_e), the elimination half‐life (t_1/2Ke), and the area under concentration–time profile (AUC_0‐∞) were 0.3 1/h, 2.29 hr, 0.039 1/h, 17.64 hr, and 855.78 mg.h/L, respectively. Following intravenous administration, the concentration–time curve fitted to a two‐compartmental open model without absorption. The primary PK parameters of the distribution rate constant (α), the elimination rate constant (β), the distribution half‐life (t_1/2α), the elimination half‐life (t_1/2β), the apparent distribution volume (V_SS), the total clearance (CL), and AUC_0‐∞ were 9.62 1/hr, 0.039 1/hr, 0.072 hr, 17.71 hr, 0.33 L/kg, 0.013 L h^?1 kg^?1, and 386.23 mg.h/L, respectively. Finally, the BA was calculated to be 22.16%. Overall, this study will provide some fundamental information on PK properties in the development of a new formulation SDZ in the future and is partially beneficial for the appropriate usage of SDZ in aquaculture.  相似文献   

电车接触网腕臂的计算     

李艾 《湖南农机》2015,(4)

电气化铁道的“三大元件”分为接触网、电力机车和牵引变电所。本论文论述时速200Km/h高速电气化铁路的接触网电车接触网腕臂的计算,接触网的计算精确程度就关系到接触线悬挂的可靠程度,故接触网计算是设计中基础的工作内容,其计算主要分为腕臂的计算和接触网的负载计算。文章详细分析了腕臂长度的计算方法,重点介绍了路基曲线区段腕臂长度、转换柱和中心柱腕臂长度的计算。  相似文献   

Detection of bovine torovirus in fecal specimens of calves with diarrhea in Japan     

Kirisawa R  Takeyama A  Koiwa M  Iwai H 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2007,69(5):471-476

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Somatic cell and innate immune responses in mammary glands of lactating cows to intramammary infusion of Bifidobacterium breve at pre-drying off period     

Hajime NAGAHATA  Mari KINE  Hisato WATANABE  Ai TANAKA  Aoi TAKAHASHI  Satoshi GONDAIRA  Hidetoshi HIGUCHI 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2021,83(12):1845

Intramammary infusion of Bifidobacterium breve (B. breve)-induced somatic cell (SC) counts, chemiluminescent response (CL), lactoferrin (LF) concentrations and mastitis-causing pathogens from quarters with subclinical mastitis were measured to evaluate innate immune response of mammary glands in dairy cows at 3 to 4 weeks before drying off. SC counts in 7 quarters of 7 control cows and 5 quarters of 6 cows with mastitis increased markedly on day 1 and SC values in control cows were significantly (P<0.05) increased and returned to pre-infusion levels on day 5 after B. breve-infusion. CL values in both groups increased markedly on day 1 and then decreased after B. breve-infusion; however, CL values in cows with mastitis did not return to normal levels on day 5 and at postpartum. The CL values were highly correlated with their SC counts in milk from both groups. LF concentrations increased toward day 3 after B. breve-infusion and were higher in cows with mastitis. B. breve-infusion eliminated 16.6% (1/6) of pathogens from 6 quarters with chronic subclinical mastitis. B. breve-induced SC responses in quarters from 3 cows with mastitis showed characteristic patterns of recovery, persistent and new infections. B. breve-induced SC counts in quarters from the cows in the pre-drying off were lower (25.7–70.6%) than those of the cows in mid-lactation. The intrinsic innate immune response in cows on pre-drying off may be decreased and appears to be insufficient to eliminate pathogens from mammary gland in the pre-drying off.  相似文献