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Phyton-International Journal of Experimental Botany 2022年第9期91卷 1923-1931页

作者： Pravej Alam Thamer hal balawi Department of Biology College of Sciences and HumanitiesPrince Sattam bin Abdulaziz UniversityAl-Kharj11942Saudi Arabia

Bacterial leaf blight(BLB)caused by Xanthomonas oryzae ***(Xoo)is one of the most damaging diseases to rice across the *** chemicals have been employed so far for the management of bacterial leaf *** the other hand,these compounds are damaging to the ecosystem and have an impact on non-target species such as humans and *** a result,there is a need to create a new natural inhibitor for BLB ***(PDF)enzyme is present in all eubacteria and its necessity in bacterial protein synthesis reveals it as an attractive target for drug *** this study,the active components of Nigella sativa have been selected based on their previously reported antimicrobial activity and screened on the active site of bacterial PDF by the in silico art of *** these compounds,dithymoquinone and p-cymene strongly bind with the PDF enzyme with binding energy values of 7.77 kcal/mol and 7.26 kcal/mol,respectively,which is comparatively higher than the control compound(−6.73 kcal/mol).Hence,the“dithymoquinone-PDF”and“p-cymene-PDF”complexes were selected for further study,and their stability was assessed by molecular dynamic(MD)*** MD simulation,both selected compounds exhibited steady-state interaction with PDF for 20 *** has been hypothesized that p-cymene and dithymoquinone inhibit peptide deformylase and could be used as antibacterials or pesticides against Xoo against the BLB disease.

关键词： Nigella sativa peptide deformylase molecular dynamic dithymoquinone

Pathway and protein engineering for biosynthesis

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Synthetic and Systems Biotechnology 2022年第4期7卷 1044-1045页

作者： Yongjin Zhou Martin Grininger hal Alper Dalian Institute of Chemical Physics Chinese Academy of SciencesChina Goethe University Frankfurt Germany The University of Texas at Austin USA

Sustainable biosynthesis of chemicals and efforts to create new molecules of interest require efficient enzymes and pathways as well as comprehensive tools and technologies to implement this *** are the key components for construction of efficient biosynthetic pathways,enzyme characterization and engineering can help to identify key enzymes and regulatory factors for construction of biosynthetic pathways,as well as improve enzyme performance;Pathway engineering can help construct biosynthetic pathways and balance metabolic network to improve biosynthetic efficiency;Tools and technologies facilitate the engineering of enzymes,pathways,and whole *** special issue focusing on“Pathway and Protein Engineering for Biosynthesis”comprises eight review articles and nine original research articles,which highlight and showcase current progress on Pathway and Protein Engineering and their application for biosynthesis.

关键词： ring engineering biosynthesis

Transporting droplets through surface anisotropy

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Microsystems & Nanoengineering 2015年第1期1卷 74-81页

作者： hal r.Holmes Karl F.Böhringer Department of Bioengineering University of WashingtonSeattleWA 98195USA Department of Electrical Engineering University of WashingtonSeattleWA 98195USA

This review article examines digital microfluidic systems that manipulate droplets through surface *** systems are categorized as surface tension driven or contact line *** tension driven systems include electrowetting on dielectric,Marangoni flow on microheater arrays,and chemical gradient surfaces,whereas contact line driven systems include anisotropic ratchet conveyors,nanostructured Parylene ratchets,and tilted pillar *** article describes the operating principles and outlines the fabrication procedures for each *** also present new equations that unify several previous models of contact line driven *** strengths and weaknesses of each system are compared,with a focus on their ability to perform the generation,switching,fusion,and fission of ***,we discuss current and potential future applications of these systems.

关键词： droplets digital microfluidics electrowetting thermocapillary forces contact line oscillation

A reflection on the contrast between the Cooper pairing in iron-based and conventional superconductors

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Frontiers of physics 2011年第4期6卷 350-356页

作者： Fa Wang Dung-hal Lee Department of Physics Massachusetts Institute of Technology Cambridge MA 02139 USA Department of Physics University of California at Berkeley Berkeley CA 94720 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

In this Perspective article we review retrospectively the streamline of our work on iron-based superconductors, and reflect on the mechanism of Cooper pairing in conventional and unconventional, such as iron-based sup... 详细信息

关键词： Cooper pairing iron-based superconductors effective interaction renormalizationgroup

On the Bifurcations of a Hamiltonian Having Three Homoclinic Loops under Z_3 Invariant Quintic Perturbations

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Acta Mathematica Sinica,English Series 2007年第5期23卷 869-878页

作者： Yu hal WU Mao An HAN Department of Mathematics Jiang Su University Zhenjiang 212013 P. R. China Department of Mathematics Shanghai Normal University Shanghai 200234 P. R. China

A cubic system having three homoclinic loops perturbed by Z3 invariant quintic polynomials is considered. By applying the qualitative method of differential equations and the numeric computing method, the Hopf bifurcation, homoclinic loop bifurcation and heteroclinic loop bifurcation of the above perturbed system are studied. It is found that the above system has at least 12 limit cycles and the distributions of limit cycles are also given.

关键词： homoclinic loop bifurcation heteroclinic loop bifurcation Hopf bifurcation stability limit cycles

Highly Oxygenated Monoterpenes from Eupatorium fortunei

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Chinese Chemical Letters 2005年第9期16卷 1217-1219页

作者： hal Xia JIANG Kun GAO State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000

A pair of epimers of highly-oxygenated monoterpenes were isolated from the traditional Chinese medicine Eupatorium fortunei. Their structures were elucidated on the basis of the spectral analysis as （1r＊, 2S＊, 3r＊, 4r＊, 6S＊）-1, 2, 3, 6-tetrehydroxy-p-menthane （1） and （1S＊, 2S＊, 3S＊, 4r＊, 6r＊）-1, 2, 3, 6-tetrehydroxy-p-menthane （2）.

关键词： Eupatorium fortunei traditional Chinese medicine epimer highly-oxygenated monoterpenes

A thermodynamic model on predicting density of medium-Mn steels with experimental verification

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Journal of Iron and Steel research(International) 2017年第11期24卷 1078-1084页

作者： Guo-hui Shen Peng-yu Wen hal-wen Luo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

A new model on predicting the density of hot-rolled multi-phased medium-Mn steel has been presen ted on the basis of thermodynamic calculations. This is an integrated model, which includes one for calculating the retained austenite （rA） fraction and the other for volume expansion during the aus tenite-to martensite transformation, because both of them are key parameters for calculating the den- sity of steel at ambient temperature. The existing empirical equations for calculating Mx temperature and lattice constants of both martensite and austenite have been all rcassessed by the XrD measure ments on the microstructures of seven hot-rolled medium-Mn steels. Finally, the densities ot seven steels were calculated merely from compositions and compared with the measured ones. The differ ence between them is no more than 1 %, suggesting that the presented model should be of good value in designing the low density steels.

关键词： Density Medium Mn steel retained austenite fraction Volume expansion Transformation

Immediate versus delayed primary nerve repair in the rabbit sciatic nerve

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Neural regeneration research 2013年第36期8卷 3410-3415页

作者： Ahmet Piskin Berrin Zühal Altunkaynak Atilla tlak Hicabi Sezgin Ozgür Yazici Süleyman Kaplan Department of Orthopedics and Traumatology School of Medicine Ondokuz Mayis University Department of Histology and Embryology School of Medicine Ondokuz Mayis University Department of Orthopedics and Traumatology School of Medicine Giresun University

It is well known that peripheral nerve injury should be treated immediately in the clinic, but in some instances, repair can be delayed. This study investigated the effects of immediate versus delayed （3 days after injury） neurorrhaphy on repair of transected sciatic nerve in New Zealand rabbits using stereological, histomorphological and biomechanical methods. At 8 weeks after immediate and delayed neurorrhaphy, axon number and area in the sciatic nerve, myelin sheath and epineurium thickness, Schwann cell morphology, and the mechanical property of nerve fibers did not differ obviously. These results indicate that delayed neurorrhaphy do not produce any deleterious effect on sciatic nerve repair.

关键词： neural regeneration delayed peripheral nerve repair sciatic nerve peripheral nerve injurystereology microscopy biomechanics neuroregeneration

NEW ErrOr ESTIMATES FOr LINEAr TrIANGLE FINITE ELEMENTS IN THE STEKLOV EIGENVALUE PrOBLEM

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Journal of Computational Mathematics 2018年第5期36卷 682-692页

作者： hal Bi Yidu Yang Yuanyuan Yu Jiayu Han School of Mathematical Sciences Guizhou Normal University Guiyang 550001 China

This paper is concerned with the finite elements approximation for the Steklov eigen- value problem on concave polygonal domain. We make full use of the regularity estimate and the characteristic of edge average interpolation operator of nonconforming Crouzeix- raviart element, and prove a new and optimal error estimate in ｜｜｜｜o,δΩ for the eigenfunc- tion of linear conforming finite element and the nonconforming Crouzeix-raviart element. Finally, we present some numerical results to support the theoretical analysis.

关键词： Steklov eigenvalue problem Concave polygonal domain Linear conforming finite element Nonconforming Crouzeix-raviart element Error estimates.

On Some Diophantine Fourier Series

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Acta Mathematica Sinica,English Series 2010年第6期26卷 1125-1132页

作者： hal Long LI Jing MA Wen Peng ZHANG Department of Mathematics Weinan Teachers University Weinan 714000 P. R. China Department of Mathematics Jilin University Changchun 130012 P. R. China Department of Mathematics Northwest University Xi'an 710069 P. R. China

We continue our study on arithmetical Fourier series by considering two Fourier series which are related to Diophantine analysis. The first one was studied by Hardy and Littlewood in connection with the classification... 详细信息

关键词： Diophantine Fourier series Diophantine Dirichlet series riesz sum