Novel piperazine‐tailored ursolic acid hybrids as significant antibacterial agents targeting phytopathogens Xanthomonas oryzae pv. oryzae and X. axonopodis pv. citri probably directed by activation of apoptosis     

Pei‐Yi Wang  Meng Xiang  Min Luo  Hong‐Wu Liu  Xiang Zhou  Zhi‐Bing Wu  Li‐Wei Liu  Zhong Li  Song Yang 《Pest management science》2020,76(8):2746-2754

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Evaluating the ecotoxicological effects of Pb contamination on the resistance against Lymantria dispar in forest plant,Larix olgensis     

Dun Jiang  Ming‐tao Tan  Qi Wang  Gui‐rong Wang  Shan‐chun Yan 《Pest management science》2020,76(7):2490-2499

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宁夏地区大籽蒿精油成分分析及其抑菌性研究     

张宸  王文翠  白璐  师淑莲  姚雷 《中国农学通报》2020,36(29):62-68

为探究宁夏大籽蒿(Artemisia sieversiana Ehrhart ex Willd.)精油成分、抑菌功能及安全性,采用水蒸气蒸馏法进行精油提取,通过气相色谱-质谱连用法(GC-MS)进行成分分析,采用滤纸片法测定其对3种菌的抑菌圈直径,测定最低抑菌浓度(MIC)、最低杀菌浓度(MBC),并通过cck-8法检测大籽蒿精油对于2种皮肤细胞的毒性作用。结果表明,宁夏大籽蒿精油的主要成分为母菊薁(29.61%),樟脑(4.80%)、桉叶油醇(4.32%)、异木香酸甲酯(4.02%);精油对铜绿假单胞菌和大肠杆菌的最低抑菌浓度为0.0781 μg/mL,最低杀菌浓度为0.3125 μg/mL;金黄色葡萄球菌MIC为0.0195 μg/mL,MBC为0.078125 μg/mL;当精油浓度小于100 μg/mL时对角质细胞(HaCaT)和皮肤成纤维细胞(NHSF)均无毒性。综上,宁夏地区大籽蒿精油具有较强的抑菌活性且安全性较高,以上结果为宁夏大籽蒿精油开发提供理论依据,以期为当地脱贫致富提供科技支撑。  相似文献   

低温与氮耦合对水稻内源激素含量的影响     

余小芬  邱学礼  张素华 《西北农林科技大学学报(自然科学版)》2020,48(9):73-80

【目的】探究不同耐冷氮高效水稻材料内源激素代谢特点,以阐明氮营养对提高水稻耐冷性的调节机理。【方法】以水稻近等基因系耐冷氮高效I16和冷敏氮低效I67为材料,采用水培试验,研究人工气候室模拟低温胁迫与4个氮肥水平(10,20,40和60 mg/L)耦合对水稻根、叶中内源激素吲哚乙酸(IAA)、细胞分裂素(CTK)、赤霉素(GA)、脱落酸(ABA)含量的影响及其互作效应。【结果】随水稻生育进程,根和叶中IAA、CTK、GA含量呈先升高后降低的趋势,在开花期达到峰值,ABA含量在成熟期达峰值。水稻根和叶中IAA、CTK、GA含量随施氮水平增加而升高,ABA则相反;在相同施氮水平下,低温抑制IAA、CTK、GA合成,促进ABA升高,4种激素含量呈现I16高于I67,叶高于根。低温与中氮耦合对水稻根和叶中IAA、CTK、GA的调控为正效应,低温与高氮耦合调控ABA为负效应,中氮可使水稻维持较高内源激素含量,这是增强水稻耐冷性的内在机理之一。【结论】在低温和氮肥耦合下,维持根叶中较高的IAA、CTK、GA、ABA含量,以及施氮对根、叶激素耦合效应的差异,是引起水稻耐冷性和氮素利用效率差异的重要生理调节因素。  相似文献   

凹凸棒石抗菌材料对湖羊生长性能、屠宰性能及肉品质的影响     

孙小淳  李书杰  朱靖  谢颖  韩兆玉 《畜牧与兽医》2021,(4):38-41

试验旨通过在湖羊全混合颗粒料中添加凹凸棒石抗菌材料,探究其对湖羊生长性能、屠宰性能和肉品质的影响.选取48只平均体重(15～20) kg、日龄(60～70日龄)的健康湖羊,公母各半,随机分为2组,每组6个重复,每个重复4只羊.对照组饲喂全混合配方颗粒料,试验组在此基础颗粒料中添加凹凸棒石抗菌材料,饲喂80 d,试验最后...  相似文献   

大豆凝集素的分子结构及其抗营养作用研究进展   总被引：1，自引：0，他引：1  

王利民  秦贵信  胡海霞  刘林娜  张玲玲  张亮亮  王涛 《吉林农业科学》2006,31(6):44-47

概述了大豆凝集素的研究情况,总结归纳了大豆凝集素的分子结构、理化特性及其对动物和人类造成的抗营养作用。  相似文献   

Influence of using plants to design landscape in city recreational squares on environment     

HU Haihui CHEN Yajun YU Lei 《东北农业大学学报(英文版)》2007,14(4):306-309

Through the investigation on influence of temperature,humidity and effects of landscape in Harbin First Department Store(Hayibai)Center Recreational Square,the influence of landscape designing of plant on the environment was researched.Two improved suggestions were given after analyzing the results of the investigation.One is to further plan the market of designing of city recreational square,and to manage and maintain the city recreational square;the other is to make good policies to control and avoid some large scale political projects.  相似文献   

Actinomycin X2, an Antimicrobial Depsipeptide from Marine-Derived Streptomyces cyaneofuscatus Applied as a Good Natural Dye for Silk Fabric     

Wei Chen  Kaixiong Ye  Xiaoji Zhu  Huihui Zhang  Ranran Si  Jianing Chen  Zijun Chen  Kaili Song  Zhicheng Yu  Bingnan Han 《Marine drugs》2022,20(1)

Actinomycins as clinical medicine have been extensively studied, while few investigations were conducted to discover the feasibility of actinomycins as antimicrobial natural dye contributing to the medical value of the functional fabrics. This study was focused on the application of actinomycin X2 (Ac.X2), a peptide pigment cultured from marine-derived Streptomyces cyaneofuscatus, in the dyeing and finishing of silk fabric. The dyeing potential of Ac.X2 with silk vs. cotton fabrics was assessed. As a result, the silk fabric exhibited greater uptake and color fastness with Ac.X2. Through Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and X-ray diffraction (XRD) analyses, some changes of chemical property for the dyed fabric and Ac.X2 were studied. The silk fabric dyed with Ac.X2 exhibited good UV protection ability. The antibacterial properties of dyed and finished silk were also evaluated, which exhibited over 90% antibacterial activity even after 20 washing cycles. In addition, the brine shrimp assay was conducted to evaluate the general toxicity of the tested fabric, and the results indicated that the dyed silk fabrics had a good biological safety property.  相似文献   

Saccharobisindole,Neoasterric Methyl Ester,and 7-Chloro-4(1H)-quinolone: Three New Compounds Isolated from the Marine Bacterium Saccharomonospora sp.     

Sohee Kim  Tu Cam Le  Sang-Ah Han  Prima F. Hillman  Ahreum Hong  Sunghoon Hwang  Young Eun Du  Hiyoung Kim  Dong-Chan Oh  Sun-Shin Cha  Jihye Lee  Sang-Jip Nam  William Fenical 《Marine drugs》2022,20(1)

Analysis of the chemical components from the culture broth of the marine bacterium Saccharomonospora sp. CNQ-490 has yielded three novel compounds: saccharobisindole (1), neoasterric methyl ester (2), and 7-chloro-4(1H)-quinolone (3), in addition to acremonidine E (4), pinselin (5), penicitrinon A (6), and penicitrinon E (7). The chemical structures of the three novel compounds were elucidated by the interpretation of 1D, 2D nuclear magnetic resonance (NMR), and high-resolution mass spectrometry (HRMS) data. Compound 2 generated weak inhibition activity against Bacillus subtilis KCTC2441 and Staphylococcus aureus KCTC1927 at concentrations of 32 μg/mL and 64 μg/mL, respectively, whereas compounds 1 and 3 did not have any observable effects. In addition, compound 2 displayed weak anti-quorum sensing (QS) effects against S. aureus KCTC1927 and Micrococcus luteus SCO560.  相似文献   

纳豆菌脂肽对分离于对虾养殖环境中产T-2毒素镰孢菌抑制效应的研究     

刘唤明  王雅玲  孙力军  徐徳峰  施琦  廖建萌  励建荣 《水产学报》2013,37(5):784-789

为了探明纳豆菌脂肽对对虾养殖环境中的产T-2毒素镰孢菌分离株的控制效应,实验采用扫描电镜观察了镰孢菌孢子超微结构、普通显微镜观察了菌丝形态、荧光显微镜观察了菌丝通透性.结果显示,脂肽浓度为1 mg/mL时,脂肽对镰孢菌孢子萌发的抑制率达78.8％,镰孢菌培养到第3天的生物量为不加脂肽对照的24.5％.扫描电镜观察结果表明,1 mg/mL的脂肽可以使镰孢菌的孢子呈念珠状;普通显微镜观察结果显示,1 mg/mL脂肽处理能使菌丝隔膜消失;荧光显微镜观察结果表明,脂肽能增加镰孢菌菌丝细胞膜的通透性.  相似文献