检索结果-南通市图书馆

自然发酵紫薯泥中融合魏斯氏菌的分离鉴定及安全性研究

在线全文

学校读者我要写书评

暂无评论

食品安全导刊 2024年第11期 140-146页

作者：林科运曾金兴杨熟英贵州省生物技术研究开发基地有限公司贵州贵阳550000

本研究以自然发酵的紫薯为菌株来源,使用特定培养基从中分离纯化出菌株ZS-1,结合菌落特征、个体形态特征以及分子生物学鉴定确定其为融合魏斯氏菌(Weissella confusa)。通过生长特性分析发现,ZS-1菌株具有稳定的生长状态与良好的产酸能... 详细信息

本研究以自然发酵的紫薯为菌株来源,使用特定培养基从中分离纯化出菌株ZS-1,结合菌落特征、个体形态特征以及分子生物学鉴定确定其为融合魏斯氏菌(Weissella confusa)。通过生长特性分析发现,ZS-1菌株具有稳定的生长状态与良好的产酸能力,该菌株对碳源的要求较低,能有效利用甘露醇、乳糖、麦芽糖和葡萄糖,生存空间大。通过吲哚实验、明胶液化实验、溶血性实验及药敏实验进行安全性分析,结果表明该菌株不具有产生溶胶酶以及分解色氨酸的能力,但存在溶血性,能引起β-溶血现象,不宜在食品领域中进一步应用。ZS-1菌株对多种抗生素表现出敏感性,包括红霉素、四环素、氯霉素、克林霉素、利福平、青霉素、氨苄西林和头孢曲松等,这些抗生素能够有效抑制该菌的生长和繁殖。关于融合魏斯氏菌在食品领域的安全性,目前的研究尚需进一步深化,本研究为未来对融合魏斯氏菌的深入研究与应用提供了宝贵的参考依据。

关键词：紫薯筛选乳酸菌融合魏斯氏菌安全性实验

Positional variation of antipodal cells in polyembryonic rice ApⅢ before and after fertilization

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2003年第11期 14-18页

作者： YUAN Liangchen 1,2, CHEN Yongzhe 2, MU Xijin 1 and lin jinxing 1*(1. Key Laboratory of Photosynthesis and Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China 2. Institute of Cell Biology and Genetics, School of Life Science, Shandong University, Jinan 250100, China) Key Laboratory of Photosynthesis and Molecular Physiology，Institute of Botany，Chinese Academy of Sciences，Beijing 100093，China Institute of Cell Biology and Genetics，School of Life Science，Shandong University，Jinan 250100，China Institute of Cell Biology and Genetics，School of Life Science，Shandong University，Jinan 250100，China Key Laboratory of Photosynthesis and Molecular Physiology，Institute of Botany，Chinese Academy of Sciences，Beijing 100093，China

The variation in the position of antipodal cells before and after fertilization in polyembryonic rice strain ApⅢ was studied by using conventional sectioning technique. It was shown that initially the three antipodal cells lie at the chalazal end of the young embryo sacs. Along with the development of embryo sac, the antipodal cells proliferate into a multicellular structure containing up to about 20 cells. Most of the cells migrate to its dorsal side when the embryo sacs turn into mature. In a few embryo sacs the antipodal cells are situated in the positions adjacent to the egg apparatus at the micropylar end, while in other sacs, they spread from the midst of the embryo sac to the micropylar end clinging to the nucellar tissue. Furthermore, it is reported for the first time that cells of some egg apparatus or proembryos disorganize when antipodal cells lie at the micropylar end, indicating that the function of the antipodal cells may vary during the embryogenesis in rice ApⅢ.

关键词： polyembryonic rice antipodal cell embryo sac egg apparatus.

Penta-P2X （X=C, Si） monolayers as wide-bandgap semiconductors： A first principles prediction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of physics 2018年第3期13卷 101-109页

作者： Mosayeb Naseri Shiru lin Jaafar Jalilian jinxing Gu Zhongfang Chen Department of Physics Kermanshah Branch Islamic Azad University Kermanshah Iran Department of Chemistry University of Puerto Rico Rio Piedras Campus San Juan PR 00931 USA Young Researchers and Elite Club Kermanshah Branch Islamic Azad University Kermanshah Iran

By means of density functional theory computations, we predicted two novel two-dimensional （2D） nanolnaterials, namely P2X （X=C, Si） monolayers with pentagonal configurations. Their structures, stabilities, intrinsic electronic, and optical properties as well as the effect of external strain to the elec- tronic properties have been systematically examined. Our computations showed that these P2C and P2Si monolayers have rather high thermodynamic, kinetic, and thermal stabilities, and are indirect semiconductors with wide bandgaps （2.76 eV and 2.69 eV, respectively） which can be tuned by an external strain. These monolayers exhibit high absorptions in the UV region, but behave as almost transparent layers for visible light in the electromagnetic spectrum. Their high stabilities and excep- tional electronic and optical properties suggest them as promising candidates for future applications in UV-light shielding and antireflection layers in solar cells.

关键词： 2D materials density functional calculations wide bandgap semiconductors

Boosting visible-light-driven water splitting over LaTaON_(2) via Al doping

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Materials 2022年第12期65卷 3452-3461页

作者： lin Yang jinxing Yu Shufang Chang Xiaoxiang Xu Clinical and Central Lab Putuo People’s HospitalTongji UniversityShanghai 200060China Shanghai Key Lab of Chemical Assessment and Sustainability School of Chemical Science&EngineeringTongji UniversityShanghai 200092China

LaTaON_(2)is an attractive visible-light-active photocatalyst for water splitting due to its broad visible light absorption as far as 650 nm and proper band edge *** these promising properties,LaTaON_(2)generally exhibits poor photocatalytic activity because of its high defect concentration that severely hinders charge ***,LaTaON_(2)has been modified by doping Al into the Ta sublattice,i.e.,LaTa_(1−x)Al_(x)O_(1+y)N_(2−y)(0≤x≤0.20).Al doping not only inhibits the defect concentration and increases surface hydrophilicity but also maintains the desired visible light absorption of LaTaON_(2).These important modifications substantially ameliorate the charge separation conditions within LaTaON_(2)and are responsible for a much enhanced photocatalytic performance for water redox reactions under visible light *** optimal conditions,the Al-doped LaTaON_(2)delivers an apparent quantum efficiency of 1.17%at 420±20 nm for water oxidation into O_(2),outperforming most LaTaON_(2)-based *** findings highlight Al as a useful dopant to open up the photocatalytic potential of metal oxynitrides whose activity is often undermined by a high defect concentration.

关键词： LaTaON2 Al doping visible light photocatalyst water splitting

在线全文

学校读者我要写书评

暂无评论

CO_2倍增对紫花苜蓿叶片形态结构的影响

莱阳农学院学报 1999年第1期16卷 1-5页

作者：孙同兴张昕张长胜林金星胡玉喜莱阳农学院基础部山东莱阳265200 中国科学院植物研究所

应用光镜和扫描电镜研究了ＣＯ２浓度倍增对紫花苜蓿（Ｍｅｄｉｃａｇｏｓａｔｉｖａ）叶片形态和结构特征的影响。结果表明，随着ＣＯ２浓度升高，叶面积显著增加，气孔密度和气孔开度呈下降趋势。此外，还发现叶肉组织细胞... 详细信息

应用光镜和扫描电镜研究了ＣＯ２浓度倍增对紫花苜蓿（Ｍｅｄｉｃａｇｏｓａｔｉｖａ）叶片形态和结构特征的影响。结果表明，随着ＣＯ２浓度升高，叶面积显著增加，气孔密度和气孔开度呈下降趋势。此外，还发现叶肉组织细胞层数增加，从而使叶片增厚。

关键词：紫花苜蓿叶片形态结构二氧化碳浓度生态系统

Zeolite-templated carbons as effective sorbents to remove methylsiloxanes and derivatives:A computational screening

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2021年第6期6卷 884-892页

作者： Shiru lin Kaitlyn A.Jacoby jinxing Gu Dariana R.Vega-Santander Arturo J.Hernaandez-Maldonado Zhongfang Chen Department of Chemistry University of Puerto RicoRío PiedrasSan JuanPR 00931USA Department of Chemistry&Biochemistry Elizabethtown CollegeElizabethtownPA 17022USA Department of Chemical Engineering University of Puerto RicoMayaguez CampusMayaguezPR 00681USA

Though widely used in our daily lives,volatile methylsiloxanes and derivatives are emerging contaminants and becoming a high-priority environment and public health *** effective sorbent materials can remove siloxanes in a cost-effective ***,by means of Grand Canonical Monte Carlo(GCMC)simulations,we evaluated the potentials of the recently proposed 68 stable zeolite-templated carbons(ZTCs)(PNAS 2018,115,E8116-E8124)for the removal of four linear methylsiloxanes and derivatives as well as two cyclic methylsiloxanes by the calculated average loading and average adsorption energy *** ZTCs,namely ISV,FAU1,FAU3,and H8326836,were identified with the top 50%adsorption performance toward all the six targeted contaminants,which outperform activated *** first principles computations revealed that steric hindrance,electrostatic interactions(further enhanced by charge transfer),and CH-p interactions account for the outstanding adsorption performance of these *** work provides a quick procedure to computationally screen promising ZTCs for siloxane removal,and help guide future experimental and theoretical investigations.

关键词： Zeolite-templated carbons Contaminants of emerging concern Methylsiloxanes GCMC simulations Density functional theory calculations

Single-atom catalysts with anionic metal centers: Promising electrocatalysts for the oxygen reduction reaction and beyond

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第12期30卷 285-293,I0006页

作者： jinxing Gu Yinghe Zhao Shiru lin Jingsong Huang Carlos R.Cabrera Bobby G.Sumpter Zhongfang Chen Department of Chemistry University of Puerto Rico.Rio Piedras Campus.San Juan.Puerto Rico 00931USA Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTennessee 37831USA Department of Chemistry and Biochemistry The University of Texas at El PasoEl PasoTexas 79968USA

Ongoing efforts to develop single-atom catalysts(SACs) for the oxygen reduction reaction(ORR) typically focus on SACs with cationic metal centers,while SACs with anionic metal centers(anionic SACs) have been generally ***,anionic SACs may offer excellent active sites for ORR,since anionic metal centers could facilitate the activation of O_(2) by back donating electrons to the antibonding orbitals of O_(2).In this work,we propose a simple guideline for designing anionic SACs:the metal centers should have larger electronegativity than the surrounding atoms in the substrate on which the metal atoms are *** means of density functional theory(DFT) simulations,we identified 13 anionic metal centers(Co,Ni,Cu,Ru,Rh,Pd,Ag,Re,Os,Ir,Pt,Au,and Hg) dispersed on pristine or defective antimonene substrates as new anionic SACs,among which anionic Au and Co metal centers exhibit limiting potentials comparable to,or even better than,conventional Pt-based catalysts towards *** also found that anionic Os and Re metal centers on the defective antimonene can electrochemically catalyze the nitrogen reduction reaction(NRR) with a limiting potential close to that of stepped Ru(0001).Overall,our work shows promise towards the rational design of anionic SACs and their utility for applications as electrocatalysts for ORR and other important electrochemical reactions.

关键词： Single-atom catalysts Anionic metal centers Antimonene Oxygen reduction reaction Nitrogen reduction reaction

肺癌合并肺结核的蛋白组学图谱及差异表达蛋白功能分析

在线全文

学校读者我要写书评

暂无评论

实用医学杂志 2024年第13期40卷 1814-1821页

作者：周文娣林佳敏琚岱晨王琪朱家楼苏宁胡锦兴广州医科大学结核病防治研究院广州市胸科医院广州510095 广州医科大学研究生院广州511436

目的旨在分析肺癌合并肺结核(LC-PTB)患者的外周血蛋白组学特征,寻找其与肺癌(LC)患者的差异蛋白并对差异蛋白进行功能分析。方法研究共纳入8例LC-PTB患者和10例LC患者,LC均为经病理确诊且未接受任何治疗的初诊患者,PTB均为采样时结核... 详细信息

目的旨在分析肺癌合并肺结核(LC-PTB)患者的外周血蛋白组学特征,寻找其与肺癌(LC)患者的差异蛋白并对差异蛋白进行功能分析。方法研究共纳入8例LC-PTB患者和10例LC患者,LC均为经病理确诊且未接受任何治疗的初诊患者,PTB均为采样时结核杆菌病原性阳性。应用液相色谱-质谱串联技术对上述患者的外周血样本进行蛋白质组学检测,并评估其间的差异蛋白,进而通过生物信息学进行功能分析。结果两组共检测到5185种蛋白质,识别出190种差异蛋白,其中58种表达上调,132种表达下调。亚细胞定位分析显示,差异蛋白主要集中在细胞质、细胞核和细胞外基质。KEGG通路及GO分析进一步揭示了差异蛋白在免疫反应、新陈代谢和分泌调控等生物过程中的作用。蛋白质互作网络分析指出SORT1、SAR1B、RPS6KB1、VWF、SHC1、SRPRB、CTSD、TARDBP、RPLP0、PSMA2、RPS6、XPO1、PRKACB、HLA-DRB1等可能在LC-PTB发生发展中发挥重要作用。此外,ADA2、MAP3K1、GLS2等蛋白的表达变化也可能与LC-PTB的发展密切相关。结论蛋白组学图谱全面描述了LC-PTB的蛋白组学特征并发现众多表达差异蛋白,有望为LC-PTB生物学机制研究提供进一步的线索。

关键词：肺癌肺结核蛋白质组学液相色谱-质谱串联技术

高分辨液质联用技术评价半夏及其炮制品硫熏前后的品质

在线全文

学校读者我要写书评

暂无评论

中国药业 2024年第17期33卷 50-55页

作者：徐丹洋张金星张志同王舒朱琳江苏省南通市食品药品监督检验中心江苏南通226014

目的建立评价半夏及其炮制品硫熏前后品质的超高效液相色谱-四极杆-飞行时间高分辨质谱(UPLC-Q-TOF-MS)法。方法色谱柱为Waters HSS T3柱(100 mm×2.1 mm,1.7µm),流动相为甲醇-乙腈(1∶1,V/V)-0.1%甲酸溶液(梯度洗脱),在正、负离子监... 详细信息

目的建立评价半夏及其炮制品硫熏前后品质的超高效液相色谱-四极杆-飞行时间高分辨质谱(UPLC-Q-TOF-MS)法。方法色谱柱为Waters HSS T3柱(100 mm×2.1 mm,1.7µm),流动相为甲醇-乙腈(1∶1,V/V)-0.1%甲酸溶液(梯度洗脱),在正、负离子监测模式下采集半夏及其炮制品硫熏前后的化合物数据,与在Chemspider,mzCloud,Metaboanalyst数据库及相关文献中检索到的化合物进行比对。应用Sciex OS软件对采集到的硫熏样品数据进行分析,找到含硫化合物的特征性中性丢失或特征性碎片离子,判定半夏及其炮制品硫熏后的含硫产物。结合偏最小二乘判别分析(PLS-DA)法对半夏及其炮制品进行分类。结果半夏及其炮制品中共检出254种化合物,主要为氨基酸、核苷及其衍生物、有机酸等小分子化合物,以及皂苷、生物碱、木质素衍生物等天然产物。半夏炮制品(姜半夏、法半夏、清半夏)硫熏后均可检出31种含硫化合物,其中6-姜辣素仅在姜半夏中检出,大豆苷和甘草酸仅在法半夏中检出。在不同程度硫熏半夏中,含硫量变化趋势基本符合严重硫熏、超限度>稍熏、略超限度>未熏的变化趋势。结论建立的UPLC-Q-TOF-MS法可快速、全面地分析对半夏及其炮制品中的化学成分。硫熏会影响半夏及其炮制品的品质,在半夏加工过程中应合理、规范使用硫熏技术,避免过度硫熏对半夏药材质量的影响。

关键词：超高效液相色谱-四极杆-飞行时间高分辨质谱法半夏半夏炮制品硫熏化学成分质量评价