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Multiferroism in Pr_2FeCrO_6 perovskite

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Journal of Rare Earths 2018年第11期36卷 1175-1178页

作者： s.Ravi Department of Physics Mepco Schlenk Engineering College

Pr2FeCrO6 perovskite crystallizes in an orthorhombic structure with R3c space group. Magnetic stuay nas revealed that Pr2FeCrO6 exhibits room-temperature ferromagnetism with a Curie temperature of about 562 K. Pr2FeCrO6 also exhibits weak ferroelectricity. Thus, given its ferroelectric and ferromagnetic na- ture, the Pr2FeCrO6 material can be considered as a multiferroic. In addition, due to its high Curie temperature and multiferroicity, it could be a promising candidate for spintronics applications.

关键词： Magnetic materials Double perovskite Magnetoresistance spintronics Rare earths

Programmable polyketide biosynthesis platform for production of aromatic compounds in yeast

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synthetic and systems Biotechnology 2020年第1期5卷 11-18页

作者： Tadas Jakočiūnas Andreas K.Klitgaard Eftychia Eva Kontou Julie Bang Nielsen Emil Thomsen David Romero-suarez Kai Blin Christopher J.Petzold Jennifer W.Gin Yaojun Tong Charlotte Held Gotfredsen Pep Charusanti Rasmus J.N.Frandsen Tilmann Weber sang Yup Lee Michael K.Jensen Jay D.Keasling The Novo Nordisk Foundation Center for Biosustainability Technical University of DenmarkKgs.LyngbyDenmark Joint BioEnergy Institute EmeryvilleCAUSA Biological systems&Engineering Division Lawrence Berkeley National LaboratoryBerkeleyCAUSA Department of Chemical and Biomolecular Engineering&Department of Bioengineering University of California BerkeleyCAUSA Center for synthetic Biochemistry Institute for Synthetic BiologyShenzhen Institutes for Advanced TechnologiesShenzhenChina Department of Chemistry Technical University of DenmarkKgs.LyngbyDenmark Department of Biotechnology and Biomedicine Technical University of DenmarkKgs.LyngbyDenmark Department of Chemical and Biomolecular Engineering(BK21 Plus Program) Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon34141Republic of Korea

To accelerate the shift to bio-based production and overcome complicated functional implementation of natural and artificial biosynthetic pathways to industry relevant organisms,development of new,versatile,bio-based production platforms is *** we present a novel yeast-based platform for biosynthesis of bacterial aromatic *** platform is based on a synthetic polyketide synthase system enabling a first demonstration of bacterial aromatic polyketide biosynthesis in a eukaryotic host.

关键词： Natural products synthetic biology Aromatic polyketides CRIsPR/Cas9 Polyketide Production platform in eukaryotes Metabolic engineering Biotechnology

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立陶宛国家图书馆改造项目

现代装饰 2017年第8期 64-69页

作者： Jokbas Jurgelis Laimis Valaninas Jurga Marcinauskaite Leonas Garbacauskas 范嘉苑 2XJ

立陶宛Martynas Mazvydas国家图书馆于1963年建成,其室内设计于近期进行了翻新。室内空间、建筑结构及装饰材料等元素在改造过程中都受到了严格的文化遗产规章限制。因此,室内空间的结构基本保持不变,而许多室内元素及装饰材料都要被修... 详细信息

立陶宛Martynas Mazvydas国家图书馆于1963年建成,其室内设计于近期进行了翻新。室内空间、建筑结构及装饰材料等元素在改造过程中都受到了严格的文化遗产规章限制。因此,室内空间的结构基本保持不变,而许多室内元素及装饰材料都要被修复或者更新。

关键词：国家图书馆立陶宛改造项目室内设计室内空间装饰材料建筑结构文化遗产

Detection of Ca^(2+)-dependent acid phosphatase activity identifies neuronal integrity in damaged rat central nervous system after application of bacterial melanin

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Neural Regeneration Research 2016年第7期11卷 1147-1152页

作者： Tigran R. Petrosyan Anna s. Ter-Markosyan Anna s. Hovsepyan Yerevan state Medical University YerevanArmenia sPC"Armbiotechnology"sNPO nas RA YerevanArmenia

The study aims to confirm the neuroregenerative effects of bacterial melanin （BM） on central nervous system injury using a special staining method based on the detection of Ca^2＋-dependent acid phosphatase activity. Twenty-four rats were randomly assigned to undergo either unilateral destruction of sensorimotor cortex （group I; n = 12） or unilateral rubrospinal tract transection at the cervical level （C3-4）（group II; n = 12）. In each group, six rats were randomly selected after surgery to undergo intramuscular injection of BM solution （BM subgroup） and the remaining six rats were intramuscularly in）ected with saline （saline subgroup）. Neurological testing confirmed that BM accelerated the recovery of motor function in rats from both BM and saline subgroups. Two months after surgery, Ca^2＋-dependent acid phosphatase activity detection in combination with Chilingarian＇s calcium adenoside triphosphate method revealed that BM stimulated the sprouting of fibers and dilated the capillaries in the brain and spinal cord. These results suggest that BM can promote the recovery of motor function of rats with central nervous system injury; and detection of Ca^2＋-dependent acid phosphatase activity is a fast and easy method used to study the regeneration-promoting effects of BM on the injured central nervous system.

关键词： nerve regeneration bacterial melanin histochemical analysis rubrospinal tract sensorimotor cortex Ca^2+-dependent acid phosphatase activity rats neural regeneration

Relative effects of different leaf attributes on sapling growth in tropical dry forest

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Journal of Plant Ecology 2014年第6期7卷 544-558页

作者： Ravi K.Chaturvedi A.s.Raghubanshi J.s.singh Institute of Environment and sustainable Development Banaras Hindu UniversityVaranasi 221005India Ecosystems Analysis laboratory Department of BotanyBanaras Hindu UniversityVaranasi 221005India

Aims soil moisture content(sMC)influences establishment,survival and development of plant species and is considered as the most important limiting factor in tropical dry forest(TDF).In this study we attempt to establish the relationship between leaf attributes and of tree saplings in TDF and address the following questions:(i)how are the functional attributes of dominant tree saplings of TDF affected by seasonal changes in sMC at different habitats?,(ii)what is the relationship of functional attributes with each other?,(iii)how are the functional attributes and their plasticity affected by habitat con-ditions?and(iv)can the functional attributes in single or in com-bination predict the growth rate of tree saplings of TDF?The study was conducted on four sites(Hathinala,Gaighat,Harnakachar and Ranitali,listed in order of decreasing sMC)within the tropical dry deciduous forest in northern *** We analysed eight leaf attributes,specific leaf area(sLA);leaf dry matter content(LDMC);leaf nitrogen concentration(leaf N);leaf phosphorus concentration(leaf P);chlorophyll concentration(Chl);mass-based photosynthetic rate(Amass);mass-based stomatal con-ductance(Gsmass);intrinsic water use efficiency(WUEi)and three growth attributes,relative diameter increment(RDI);relative height increment(RHI);relative growth rate(RGR)of the 10 dominant tree saplings(viz.,Acacia catechu,Anogeissus latifolia,Boswellia serrata,Buchanania lanzan,Diospyros melanoxylon,Hardwickia binata,Lagerstroemia parviflora,Lannea coromandelica,shorea robusta and Terminalia tomentosa)of a TDF and observed the effects of site,season and species for a period of 2 *** were selected in gradients of ***-wise multiple regression was performed to predict RDI,RHI and RGR from mean values of sMC and leaf *** Findings All the 11 attributes were interrelated and differed significantly among the 10 *** response varied across sites and *** the sMC g

关键词： tropical dry forest soil moisture content deciduousness tree saplings leaf attributes relative growth rate

synthesis and luminescence characteristics of terbium(Ⅲ) activated nasrBO_3

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Journal of Rare Earths 2012年第9期30卷 856-859页

作者： P.A. Nagpure s.K. Omanwar Department of Physics SGB Amravati University Amravati-444602 (M.S.) India

The thermoluminescence （TL） and photohmainescence （PL） properties of the phosphor nasrBO3：Tb3＋ were reported and discussed. The combustion technique was used for the synthesis of polycrystalline samples of nasrBO3：Th3＋. The TL glow curve of the compound had a simple structure with a single peak at 434 K. TL sensitivity of the phosphor was found to be more than that of （LiF：Mg,Cu,P）. The TL glow curve was studied as a function of concentration of dopant and dose of gamma ray irradiation. The kinetic parameters of the thermolumines- cence of nasrBO3： Tb3＋were calculated employing the peak shape method. The photoluminescence （PL） properties of Tb3＋ doped in nas- rBO3 were studied over the 200-400 nm excitation range. The excitation spectra of nasrBO3：Tb3＋ consisted of single narrow band peaking at about 236 nm. The emission spectra monitored at 236 nm excitation consisted of a series of sharp lines peaking at 489, 544, 586 and 622 nm corresponding to the 5D4→7Fj （j=3,4,5,6） transitions within the 4f8 configurations of Tb3＋.

关键词： thermoluminescence photoluminescence terbium nasrBO3 combustion synthesis rare earths

structure and Properties of Nanostructured Vacuum-Deposited Foils of Invar Fe–(35–38 wt%)Ni Alloys

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Journal of Materials science & Technology 2015年第11期31卷 1079-1086页

作者： V.M.Nadutov A.I.Ustinov s.A.Demchenkov Ye.O.svystunov V.s.skorodzievski G.V.Kurdyumov Institute for Metal Physics of National Academy of sciences of Ukraine E.O.Paton Electric Welding Institute of National Academy of sciences of Ukraine

The process of electron beam vacuum deposition of the Fe-（35-38 wt%）Ni alloys at substrate temperatures Ts from 300 to700 ℃ were used to produce vacuum-deposited foils with the FCC structure, differing by the size of characteristic microstructural elements （grains and subgrains）. It was shown that refinement of foil microstructural elements to nanoscale is accompanied by their microhardness increase up to 4-5 GPa. The change of the thermal expansion coefficient （TEC） of the nanostructured （Ns） foil of the Fe-35.1Ni alloy within the temperature range from -50 to 150 ℃ has some deviation from that observed for cast Invar alloy of the same composition. It has been found that the main factors affecting the peculiarities of thermal expansion of the Ns foil can be related to the presence of small fraction of BCC- phase in them, high level of crystalline lattice microstrains and inhomogeneous magnetic order in FCC- phase. It was shown that as a result of additional thermal treatment of Ns foils their invar properties become similar to that observed for cast Invar alloy but mechanical properties remain on the same level.

关键词： Fe-Ni alloys Electron beam physical vapor deposition (EBPVD) Nanostructured materials Hardness Thermal expansion Mossbauer spectroscopy

Non-anatomic fixation for longstanding traumatic pubic diastasis using a bone graft： A report of two cases

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Chinese Journal of Traumatology 2017年第6期20卷 362-365页

作者： Giedrius Petryla Valentinas Uvarovas Igoris satkauskas Povilas Masionis Narunas Porvaneckas Department of Orthopedics and Traumatology Vilnius University Faculty of Medicine Republican Vilnius University Hospital Siltnamiu Str. 29 04130 Vilnius Lithuania

The incidence of internal fixation failure of symphysis diastasis varies from 6% to 75%. Hardware breakage or migration and symphysis disruption recurrence are often asymptomatic and only in a few cases reoperation is required. This report describes the managements of two cases after failed internal fixation and neglected traumatic symphysis diastasis when it was technically impossible to achieve anatomical reduction of the anterior pelvic ring. Internal fixation and a bone graft for the symphysis without anatomical reposition were performed. Both of the patients achieved good results and had no complaints of pain during daily activities. Restoration of the anatomy should not be the aim in treating recurrence of the symphysis diastasis after failed fixation. The aim of the surgery was static fixation of the anterior pelvic ring with bone grafting.

关键词： symphysis diastasis Pelvic ring static fixation Bone grafting

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美国科学院

科技导报 1980年第2期 76-77页

作者：菲利普·汉德勒美国科学院院长

美国科学院(National Academy of sciences,nas)成立于1863年。根据国会通过的法案,它是一个民间组织,对政府保持独立,但为政府提供顾问;它不享受国会拔款、不设研究所等机构,院士为荣誉职、不受薪。由美国科学院建立的工程科学院(Natio... 详细信息

美国科学院(National Academy of sciences,nas)成立于1863年。根据国会通过的法案,它是一个民间组织,对政府保持独立,但为政府提供顾问;它不享受国会拔款、不设研究所等机构,院士为荣誉职、不受薪。由美国科学院建立的工程科学院(National Academy of Engineering,NAE)和医学科学院(Institute of Medicine,IOM)也属同样性质。为了吸收全国最优秀的科学技术力量为联邦政府和公众工作,由以上三院联合,组成国家研究委员会(National Research Council,NRC)下设常设机构。根据政府各部门提出的各种课题和经费,NRC邀请全国各地的专家义务组成各种研究小组进行研究,其成果报告由NRC审查后,以NRC的名义提交政府。

关键词：科学院医学小组课题现代医药学院士 NRC 委员会学部美利坚合众国北美洲美国审委会