宋代水傀儡艺术研究

文章以宋代水傀儡为主要研究对象,通过对相关文献和现有成果的整理,梳理出水傀儡从三国至宋代的历史发展脉络,通过论证认为宋代是水傀儡艺术的高度成熟期。在此基础上,文章比较发现宋代水傀儡与百戏、杂剧以及越南李朝(12世纪初)水傀儡之间存在着密切的关系。

Arginine functionalized hydroxyapatite nanoparticles and its bioactivity for gene delivery

In order to further improve the transfection efficiency of hydroxyapatite nanoparticle （HAp）, arginine functionalized hydroxyapatite （HAp/Arg） was synthesized by hydrothermal synthesis. The morphology, crystallite size and zeta potential of the HAp/Arg were characterized by transmission electron microscopy （TEM）, atomic force microscopy （AFM） and zeta potential analyzer. The loading and protecting properties of HAp/Arg to DNA were tested by electrophoresis. Its cytotoxicity was also measured in Hela cells and HAEC cells by MTT and LDH, and its transfection efficiency was examined by fluorescence microscope and flow cytometry. The results reveal that HAp/Arg is short rod-like and nano single crystal, the mean diameter is 50-90 nm and zeta potential is 35.8 mV at pH 7.4. HAp/Arg to DNA can be condensed by electrostatic effect and protect DNA against degradation in DNase I, and shows high transfection efficiency without cytotoxicity. These results suggest that HAp/Arg can be a promising alternative as a novel gene delivery system.

绚烂的撒尼刺绣文化

文山州丘北县普者黑,不仅山水秀美,更有底蕴深厚的民族文化。当你步入普者黑风景区时,一个个穿着"阿诗玛"服装的"小阿乃"(撒尼语小姑娘之意)就这样毫无准备地闯进了你的视野。她们或为你撑船摆舵。

Study on Liposomes of Mimetic Red Cell

Liposomes were prepared by adding hydrophilic agents PEG PE, rigidity agent SM in the bilayer membrane for mimetic red cell membrane. In PBS or serum, release of calcein content from liposomes dramatically decreased, which demonstrated increasing membrane stability by adding PEG PE or SM. The ratio b/R of the remains of liposomes in blood to that in RES was used as a parameter of biodistribution in vivo. At 2 h after iv injection, b/R of modified liposomes was enhanced 6.5～13.1 fold. Their clearance half life from blood circulation was delayed 1.6～5.8 fold. The modification of liposome membrane by PEG PE or SM is the favorable condition for drug liposomes to target the non RES.

Aliphatic amines modified CoO nanoparticles for catalytic oxidation of aromatic hydrocarbon with molecular oxygen

The surface modification of metal oxides using organic modifiers is a potential strategy for enhancing their catalytic performances.In this study,a hydrophobic surface amine-modified CoO catalyst with a water contact angle of 143°was fabricated.The catalyst was characterized by XRD,TGA,FT-IR,HR-TEM,and XPS.The results showed that the fabricated catalyst performed better than the hydrophilic commercial CoO nanoparticle in the process of aromatic hydrocarbon oxidation.After the amines modification,commercial CoO also became hydrophobic and improved conversion of ethylbenzene was achieved.The surface modification of CoO with amines induced the hydrophobicity property,which could serve as a reference for the design of other hydrophobic catalysts.

Roles of heteroatoms in electrocatalysts for alkaline water splitting:A review focusing on the reaction mechanism

Alkaline water splitting is a promising technology for“green hydrogen”generation.To improve its efficiency,highly robust catalysts are required to reduce the overpotential for low electrical power consumption.Heteroatom modification is one of the most effective strategies for boosting catalytic performance,as it can regulate the physicochemical properties of host catalysts to improve their intrinsic activity.Herein,aiming to provide an overview of the impact of heteroatoms on catalytic activity at the atomic level,we present a review of the key role of heteroatoms in enhancing reaction kinetics based on the reaction pathways of the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)in alkaline media.In particular,the introduction of heteroatoms can directly and indirectly optimize the interactions between the active sites and intermediates,thus improving the intrinsic activity.To clearly illustrate this influence in detail,we have summarized a series of representative heteroatom-modified electrocatalysts and discussed the important roles of heteroatoms in the OER and HER reaction pathways.Finally,some challenges and perspectives for heteroatom-modified electrodes are discussed.We hope that this review will be helpful for the development of efficient and low-cost electrocatalysts for water electrolysis and other energy conversion applications.

One-step post-synthesis treatment for preparing hydrothermally stable hierarchically porous ZSM-5

Hierarchically porous ZSM‐5 (SiO2/Al2O3 ≈ 120) containing phosphorus was prepared by a one‐step post‐synthesis treatment involving controlled desilication and phosphorous modification. The hierarchically porous ZSM‐5 featured high thermal and hydrothermal stability. The obtained ZSM‐5zeolites were systematically characterized by X‐ray diffraction, scanning electron microscopy,transmission electron microscopy, N2 adsorption‐desorption, NH3 temperature‐programmed desorption,and 27Al and 31P magic‐angle spinning nuclear magnetic resonance spectroscopy. Theprepared ZSM‐5 displayed enhanced activity and prolonged lifetime toward hydrocarbon cracking.The high activity was attributed to improved coke tolerance owing to the presence of the highlystable mesoporous network of ZSM‐5 and acid sites introduced upon phosphorus modification.Additionally a mechanism of the stabilization of the zeolites by phosphorus was proposed and discussed.

Application of Geopolymer Cement for Groutless Decorative Building Materials

The present study describes the experiments on the application of geopolymer paste for groutless in situ casting or flooring. The paste was synthesized from fly ash and sodium silicate solution and cured at room temperature, 60 and 80℃ for 24 hours. To simulate flooring application, the geopolymer paste was casted on Portland cement cubes which have been fully hydrated for 28 days. Silica fume was added to reduce cracks but at the same time compressive strength decreased. Averaged compressive strength decreased from 53 MPa to 37 MPa for paste cured at 60℃. Curing at higher temperatures produced stronger geopolymer, with compressive strength of 12 MPa, 53 MPa and 67 MPa for geopolymer cured at room temperature, 60℃ and 80℃ respectively, however, higher curing temperature resulted in more cracking when the geopolymer paste was applied on the Portland cement substrate. Averaged hardness values were 65 and 43 Brinnel scale （BHN）, and wear rate, measured using Ogoshi machine, were 0.66 and 1.80 mm3/min for samples cured at 60 and 80℃ respectively. Unless surface hardening was applied, the material is not suitable for flooring but do so for decorative masonry.

Epigenetic regulation in alcoholic liver disease

Alcoholic liver disease （ALD） is characterized by steatosis or fat deposition in the liver and inflammation, which leads to cirrhosis and hepatocellular carcinoma. Induction of target genes without involving changes in DNA sequence seems to contribute greatly to liver injury. Chromatin modifications including alterations in histones and DNA, as well as post-transcriptional changes collectively referred to as epigenetic effects are altered by alcohol. Recent studies have pointed to a significant role for epigenetic mechanisms at the nucleosomal level influencing gene expression and disease outcome in ALD. Specifically, epigenetic alterations by alcohol include histone modifications such as changes in acetylation and phosphorylation, hypomethylation of DNA, and alterations in miRNAs. These modifications can be induced by alcoholnduced oxidative stress that results in altered recruitment of transcriptional machinery and abnormal gene expression. Delineating these mechanisms in initiation and progression of ALD is becoming a major area of interest. This review summarizes key epigenetic mechanisms that are dysregulated by alcohol in the liver. Alterations by alcohol in histone and DNA modifications, enzymes related to histone acetylation such as histone acetyltransferases, his-tone deacetylases and sirtuins, and methylation enzymes such as DNA methyltransferases are discussed. Chromatin modifications and miRNA alterations that result in immune cell dysfunction contributing to inflammatory cytokine production in ALD is reviewed. Finally, the role of alcohol-mediated oxidative stress in epigenetic regulation in ALD is described. A better understanding of these mechanisms is crucial for designing novel epigenetic based therapies to ameliorate ALD.

Dye-sensitized photoanode decorated with pyridine additives for efficient solar water oxidation

Splitting water into hydrogen and oxygen by dye-sensitized photoelectrochemical cell(DSPEC)is a promising approach to solar fuels production.In this study,a series of pyridine derivatives as surface additives were modified on a molecular chromophore and water oxidation catalyst co-loaded TiO_(2)photoanode,TiO_(2)|RuP,1(RuP=Ru(4,4′-(PO3H2)2-2,2′-bipyridine)(2,2′-bipyridine)2,1=Ru(bda)(L)2,(bda=2,2′-bipyridine-6,6′-dicarboxylate,L=10-(pyridin-4-yloxy)decyl)phosphonic acid).The addition of pyridine additives was found to result in up to 42%increase in photocurrent.Under simulated sun-light irradiation,TiO_(2)|RuP,1,P1(P1=4-Hydroxypyridine)produced a photocurrent density of 1 mA/cm2 at a bias of 0.4 V vs.NHE in acetate buffer.Moreover,the observed photocurrents are correlated with the electron-donating ability of the substituent groups on pyridine ring.Transient absorption measurements and electrochemical impedance spectroscopy revealed that surface-bound pyridine can effectively retard the back-electron transfer from the TiO_(2)conduction band to the oxidized dye,which is a major process responsible for energy loss in DSPECs.

Graphene-gold Nanoparticle Composite Film Modified Electrode for Determination of Trace Mercury in Environmental Water

The graphene-gold nanoparticles composite film modified glassy carbon electrode （EG- AuNPs/GCE） was prepared by one-step coelectrodeposition and employed for determination of trace mercury in environmental water with differential pulse stripping voltammetry. Such a nanostructured composite film combined with the advantages of gold nanoparticles and graphene, can greatly promote the electron-transfer process and increase accumulation abil-ity for Hg（Ⅱ）, leading to a remarkably improved sensitivity. The linear calibration curve ranged from 0.2 μg/L to 30 μg/L for Hg（Ⅱ） and the detection limit （S/N=3） was found to be 0.03 μg/L at a deposition time of 300 s. Moreover, the stablity of the as-prepared electrode and interferences from other substances were evaluated. The modified electrode was successfully applied to the direct detection of Hg（Ⅱ） in real water samples.

第三届世界考古论坛·良渚古城水管理系统国际学术研讨会

2017年12月12-14日,“第三届世界考古论坛·良渚古城水管理系统国际学术研讨会”在杭州良渚举行。本次会议以“良渚古城水管理系统”为主题,围绕良渚古城外围水利系统的重大价值,共同探讨良渚遗址大研究、大保护的方法路径,进一步提升良渚文化在国际上的知名度和影响力。此次会议由浙江省文物局、杭州市余杭区政府主办,杭州良渚遗址管理区管理委员会、浙江省文物考古研究所承办,中国社会科学院考古研究所、中国考古学会支持。

美妆潮流新计

即使镜头再拉近,也只能看到零瑕疵的水润肌肤。即使设计再夸张,也不能脱离艺术美的基本准则。美丽不是完美,而是抓住潮流的重点,塑造最适合的妆容。技法不是套路,而是运用造型的魔力,呈现最自然的风格。1素雅端庄、气质女神关键词：鲜花面纱＋潮流色彩轻薄的面纱不仅没有遮住脸部的好气色,却隐隐透露出朦胧的羞涩感。眼妆部分使用了当下潮流色——肉粉,

施工有难处 编辑来帮忙 6个泥瓦施工中的难点

很多人都抱怨装修太累,想想也是,光装修工人就有水电、木工、泥瓦、油漆工那么多,更别提那些看了头就大的预算了。前面几期我们已经介绍过不少难点了,这一期我们主要讲泥瓦工。你家的师傅要是连下面这些难点都能游刃有余,那恭喜你,摊上了一个好师傅。

老房翻新 拆旧先做好

读者李先生家一套70平米的老房要翻新了,小夫妻俩预算有限,让装修公司做了预算,拆旧费就要3000多元,价格真不低。在设计师介绍下,找到了一家专业拆旧公司估个价,没想到竟要4000多,李先生郁闷了,拆旧到底找谁做?为什么这么贵?有没有便宜的?便宜的好不好?……这一大堆问题,像一个个关卡似的层层递进。经过编辑一番采访了解到,其实拆旧的方法挺多的。

A new insight into electrochemical detection of eugenol by hierarchical sheaf-like mesoporous NiCo2O4

NiCo2O4 nanosheets with sheaf-like nanostructure morphologies have been synthesized by a facile one-step hydrothermal reaction followed by annealing treatment. Impressively, the NiCo2O4 nanosheets exhibit rapid detection of eugenol. The linear range of detection is from 1-500μM, and the limit of detection is 5.4 μM. The NiCo2O4 modified electrode demonstrated high sensitivity, good repeatability and reproducibility, and long-term stability （7% decrease in response over 30 days）. Based on this work, an electrochemical reaction mechanism for eugenol oxidation was proposed, and in addition, the NiCo2O4 modified electrode was successfully employed for the analysis of eugenol in medicative balm samples. Recovery values for eugenol in medicative balm samples were in the range 98.7%-105.5%.

Decorating multiwalled carbon nanotubes with zinc oxide nano-crystallines through hydrothermal growth process

Multiwalled-carbon nanotubes coated with nano-crystalline zinc oxide （ZnO） was prepared by in situ growth of nano zinc oxide on the surfaces of carbon nanotubes through hydrothermal method. X-ray diffraction, transmission electron microscopy and scanning electron microscopy analysis techniques were used to characterize the samples. It was observed that a layer of nano-crystalline ZnO with the wurtzite hexagonal crystal structure was uniformly coated on the nanotube surfaces with good adhesion, which resulted in the formation of a novel ZnO-nanotuhe nano composite. In this work, the carbon nanotubes decorated by metal oxide nanoparticles were synthesized by a simple chemical-solution route which is suitable for the large-scale production with low cost.