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101. Novel Strategy for Facile Synthesis of C-Shaped CeO2Nanotubes with Enhanced Catalytic Properties

Author

Lv, Nan, Zhang, Jilin, Li, Guangming, Wang, Xun, and Ni, Jiazuan

Abstract

Despite synthesis progress of one-dimensional (1D) nanomaterials, the fabrication of nanotubes with an exposed internal space remains a major challenge. Herein, we report a novel strategy to synthesize C-shaped CeO2nanotubes (NTs) via an electrospinning technique utilizing two immiscible polymers as template and the Kirkendall effect for the first time. The C-shaped nanotubes with the half-wall-like tubular structure possess an exposed internal space and large surface area, just like the letter “C”. The formation mechanism of C-shaped CeO2nanotubes has been rationally explained, and their exceptional performance and practicability have been befittingly evaluated. This facile synthesis strategy is applicable to various rare earth oxides. Our work opens a new route for the construction of a 1D C-shaped nanotubes structure. With their unique structure, the C-shaped nanotubes exhibit fantastic properties, which are extremely intriguing for their potential applications in catalysis, sensors, and microreactors.

Published
2017
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132. Three-dimensional structure and mimetic-membrane association of consensus 11-amino-acid motif from soybean lea3 protein.

Author

Xue, Rong, Liu, Yun, Zheng, Yizhi, Wu, Yijie, Li, Xiaojing, Pei, Fengkui, and Ni, Jiazuan

Abstract

The occurrence of a highly conserved 11-mer repeating motif in the primary sequence is a major characteristic of group 3 late embryogenesis abundant (LEA3) proteins, which are strongly associated with abiotic stress tolerance of the plants. In this study, the three-dimensional structure, mimetic membrane association, and salt effect for consensus 11-mer motif from soybean PM2 protein (LEA3) were investigated in sodium dodecyl sulfate (SDS) micelles by NMR techniques. It was shown that the 11-mer motif was disordered in aqueous solution, but adopted an α-helix in SDS micelles. NMR diffusion measurements demonstrated that the 11-mer motif was associated with SDS micelles. Paramagnetic quenching NMR experiments further revealed the orientation of the 11-mer motif with respect to the mimetic membrane: the ordered N-terminal segment was inserted into the mimetic membrane, and the disordered C-terminal segment was exposed to water. In addition, salt addition could not change the secondary structure of the 11-mer motif, but might slightly alter the relative spatial position of some N-terminal residue atoms. These results implied that the 11-mer motif would take an important role in structural plasticity and membrane stabilization for LEA3 proteins. © 2011 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 98: 59-66, 2012. [ABSTRACT FROM AUTHOR]

Published
2012
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137. Preparation and application in electrochemistry of nanocrystalline CeO[2].

Author

Xiangting, Dong, Xiaogang, Qu, Hong Guangyan, Yu Decai, Lu Tianhong, and Ni Jiazuan

Subjects
OXIDATION-reduction reaction, CYTOCHROME c, SCIENTIFIC experimentation
Abstract

Presents a study on the synthesization of nanocrystalline CeO[2] utilizing the sol-gel method and the electron transfer of cytochrome c on nanocrystalline gold. Details on the preparation and measurement of samples; Information on experiments conducted; Discussion on findings.

Published
1996

139. NMR study of monophthalocyaninatolanthanide (III) compounds

Author

Xiao Yan‐Wen, Shi Feng, Ni Jiazuan, and Zhuang Wen‐De

Subjects
NMR spectra database, chemistry.chemical_compound, Crystallography, Chemistry, Stereochemistry, Chemical shift, Rare earth, General Chemistry, Cyanine, Carbon-13 NMR, Spectral line
Abstract

The variation of ~1H NMR shifts of monophthalocyaninatolanthanide(Ⅲ)compounds of nine rare earth elements from Sm~(3+)to Lu~(3+)(except Gd~(3+))was studied.It was found that a“triad effect”appears in the sign alteration of the induced chemical shifts of α,β protons in the phthalo- cyanine rings for the second half of the rare earth series,that is,~1H NMR spectra shift upfield for Tb~(3+),Dy~(3+)and Ho~(3+)compounds,while for Er~(3+),Tm~(3+)and Yb~(3+)the spectra shift downfield.The largest alteration of the chemical shifts appears in the compound with Tb~(3+).This is in agreement with the regularity obtained theoretically by Bleaney. The ~(13)C NMR spectra of several monophthalocyaninatolanthanide compounds have also been recorded.The variation of the chemical shifts was discussed.

Published
1987

140. Crystal structure of [Yb (NO3)3 (phen) (H2O)] · (12-crown-4)

Author

Mao, Jianggao, Jin, Zhongsheng, and Ni, Jiazuan

Abstract

The title complex was prepared by reacting Yb(NO3)3 (12-crown-4) with 1,10-phenanthroline (hereafter phen) in acetone. It crystallized in the triclinic space group " witha=10.095(5),b=17.415(4),c=8.710(2) Å α=92.45(2), β=115.83(3), γ=74.08(3)0 andDc=1.85 g cm−3;Z=2. The metal ion in this complex is nine-coordinated to three bidentate nitrate ions, two nitrogen atoms of a phen and a water molecule. The crown ligand is hydrogen bonded to the coordination water molecule. The symmetry change of the crown ether is also discussed.

Published
1993
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141. Photophysical Properties of Some Binary and Ternary Complexes of Rare Earth Ions with Aminobenzoic Acids and 1,10-Phenanthroline

Author

Yan, Bing, Zhang, Hongjie J., Wang, Shubin B., and Ni, Jiazuan Z.

Abstract

Photophysical properties (e.g.luminescence and energy transfer) of binary and ternary complexes of Gd3+, Eu3+, and Tb3+with aminobenzoic acids and 1,10-phenanthroline were studied in connection with their spectroscopic characterization. Intramolecular energy transfer between center ions and ligands as well as between ligands is discussed in detail. Die photophysikalischen Eigenschaften (z.B. Lumineszenz und Energieübertragung) von binären und ternären Komplexen von Gd3+, Eu3+, und Tb3+mit Aminobenzoesäuren und 1,10-Phenanthrolin wurden im Zusammenhang mit ihrer spektroskopischen Charakterisierung bestimmt. Der intramolekulare Energietransfer zwischen Zentralionen und Liganden bzw. zwischen Liganden wird detailliert erörtert.

Published
1998
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142. Synthesis, Characterization, and Photophysical Properties of Rare Earth Complexes of N-Phenyl-2-aminobenzoic Acid and 1,10-Phenanthroline

Author

Yan, Bing, Zhang, Hongjie, Wang, Shubin, and Ni, Jiazuan

Abstract

Some novel binary and ternary complexes of rare earth ions (Gd, Eu, Tb) with N-phenyl-2-aminobenzoic acid and 1,10-phenanthroline were synthesized by homogenous precipitation and characterized by elemental analysis, IR spectra, UV/Vis spectra, and thermal analysis. The phosphorescence spectra and lifetimes of gadolinium complexes were measured, and the triplet state energies of N-phenyl-2-aminobenzoic acid and 1,10-phenanthroline as well as the energy transfer efficiencies between N-phenyl-2-aminobenzoic acid and 1,10-phenanthroline were determined. The photophysical properties such as luminescence and intramolecular energy transfer between the rare earth center ions and the ligands and between ligands are discussed. Einige neue binäre und ternäre Komplexe von Seltenerdionen (Gd, Eu, Tb) mit N-Phenylanthranilsäure und 1,10-Phenanthrolin wurden durch homogene Fällung synthetisiert und durch Elementaranalyse, IR- und UV/Vis-Spektren und thermische Analyse charakterisiert. Die Phosphoreszenzspektren und Lebensdauern der Gadoliniumkomplexe wurden gemessen, und die Triplettenergien der N-Phenylanthranilsäure und des 1,10-Phenanthrolins sowie die Energie-transfereffizienz zwischen den beiden wurden abgeleitet. Die photophysikalischen Eigenschaften wie Lumineszenz und intramolekularer Energietransfer zwischen Seltenerdion und Liganden sowie zwischen den Liganden werden diskutiert.

Published
1998
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143. Selenoprotein W modulates tau homeostasis in an Alzheimer's disease mouse model.

Author

Ren, Bingyu, Situ, Jiaxin, Huang, Xuelian, Tan, Qiulong, Xiao, Shifeng, Li, Nan, Tian, Jing, Du, Xiubo, Ni, Jiazuan, and Liu, Qiong

Subjects
*NEUROFIBRILLARY tangles, *TRANSGENIC mice, *ALZHEIMER'S disease, *TAU proteins, *LABORATORY mice, *HOMEOSTASIS, *ANIMAL disease models
Abstract

Lower selenium levels are observed in Alzheimer's disease (AD) brains, while supplementation shows multiple benefits. Selenoprotein W (SELENOW) is sensitive to selenium changes and binds to tau, reducing tau accumulation. However, whether restoration of SELENOW has any protective effect in AD models and its underlying mechanism remain unknown. Here, we confirm the association between SELENOW downregulation and tau pathology, revealing SELENOW's role in promoting tau degradation through the ubiquitin‒proteasome system. SELENOW competes with Hsp70 to interact with tau, promoting its ubiquitination and inhibiting tau acetylation at K281. SELENOW deficiency leads to synaptic defects, tau dysregulation and impaired long-term potentiation, resulting in memory deficits in mice. Conversely, SELENOW overexpression in the triple transgenic AD mice ameliorates memory impairment and tau-related pathologies, featuring decreased 4-repeat tau isoform, phosphorylation at Ser396 and Ser404, neurofibrillary tangles and neuroinflammation. Thus, SELENOW contributes to the regulation of tau homeostasis and synaptic maintenance, implicating its potential role in AD. A study shows that SELENOW binds tau and promotes its degradation via the ubiquitin‒proteasome system. SELENOW deficiency causes synaptic defects and memory deficits in mice, while overexpression in AD models has alleviating effects, highlighting its potential role in AD. [ABSTRACT FROM AUTHOR]

Published
2024
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144. Effect of Herbal Medicinal Compounds on Alzheimer’s Disease Pathology in APP/PS1 Transgenic Mouse Model

Author

Li, Xuexia, He, Zhijun, Wang, Chao, Liu, Yanjun, Shan, Zhifu, Zhang, Lei, Shi, Qingqing, Yue, Caiping, Lin, Yitong, Liu, Yun, Ni, Jiazuan, and Du, Xiubo

Abstract

The pathogenesis of Alzheimer’s disease (AD) is complex as various mechanisms interact with each other and, therefore, intervention from a single target is often ineffective. Many studies have shown that herbal medicines, such as curcumin, fisetin, icariin, and ginsenosides, have significant intervention effects on AD with different treatment mechanisms. Therefore, we have designed this study to know whether the combination of these herbal medicines can have an intervention effect on AD through multiple targets. Amyloid precursor protein/presenilin 1(APP/PS1) double transgenic AD mice were used to study the protective effects of a combination of curcumin, piperine, icariin, and ginsenosides, as well as a combination of fisetin, piperine, icariin, and ginsenosides, which were separately mixed into the feed. These herbal medicinal compounds (HMCs) lowered the serum lipid levels, reduced the Aβ oligomers, decreased the pS404-tau protein, as well as neurofibrillary tangles, and restored the reduction of synaptic protein levels and neuronal death of AD mice without causing toxicity to liver and kidneys. In this study, we found that HMCs have significant intervention against AD through multiple targets, providing a novel therapeutic idea for the prevention of AD.

Published
2020
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