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Strong Suppression of Systemic Acquired Resistance in Arabidopsis by NRR is dependent on its Ability to Interact with NPRland its Putative Repression domain

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Molecular Plant 2008年第3期1卷 552-559页

作者： Mawsheng chern Patrick E. canlas Pamela c. Ronald department of Plant Pathology University of California Davis CA 95616 USA

Systemic Acquired Resistance （SAR） in plants confers lasting broad-spectrum resistance to pathogens and requires the phytohormone salicylic acid （SA）. Arabidopsis NPR1/NIM1 is a key regulator of the SAR response. Studies attempting to reveal the function of NPR1 and how it mediates SA signaling have led to isolation of two classes of proteins that interact with NPRI＂ the first class includes rice NRR, Arabidopsis NIMIN1, NIMIN2, and NIMIN3, and tobacco NIMIN2-1ike proteins; the second class belongs to TGA transcription factors. We have previously shown that overexpression of N RR in rice suppresses both basal and Xa21-mediated resistance. In order to test whether NRR affects SA-induced, NPRl-mediated SAR, we have transformed Arabidopsis with the rice NRR gene and tested its effects on the defense response. Expression of NRR in Arabidopsis results in suppression of PR gene induction by SAR inducer and resistance to pathogens. These phenotypes are even more severe than those of the nprl-1 mutant. The ability of NRR to suppress PR gene induction and disease resistance is correlated with its ability to bind to NPR1 because two point mutations in NRR, which reduce NPR1 binding, fail to suppress NPR1. In contrast, wild-type and a mutant NRR, which still binds to NPR1 strongly, retain the ability to suppress the SAR response. Replacing the c-terminal 79 amino acids of NRR with the VP16 activation domain turns the fusion protein into a transcriptional co-activator. These results indicate that NRR binds to NPR1 in vivo in a protein complex to inhibit transcriptional activation of PR genes and that NRR contains a transcription repression domain for active repression.

关键词： NRR NPR1 SA SAR disease resistance.

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Establishing empirical relationships to predict grain size and tensile strength of friction stir welded AA 6061-T6 aluminium alloy joints

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Transactions of Nonferrous Metals Society of china 2010年第10期20卷 1863-1872页

作者： S.RAJAKUMAR c.MURALIdHA RAN V.BALASUBRAMANIAN department of Manufacturing Engineering Annamalai University

AA 6061-T6 aluminium alloy(Al-Mg-Si alloy) has gathered wide acceptance in the fabrication of light weight structures requiring a high specific strength and good corrosion *** with the fusion welding processes that are routinely used for joining structural aluminium alloys,friction stir welding(FSW) process is an emerging solid state joining process in which the material welded does not melt and *** strength is influenced by the grain size and tensile strength of the weld nugget ***,an attempt was made to develop empirical relationships to predict grain size and tensile strength of friction stir welded AA 6061-T6 aluminium alloy *** empirical relationships are developed by response surface methodology(RSM) incorporating FSW tool and process parameters.A linear regression relationship was also established between grain size and tensile strength of the weld nugget of FSW joints.

关键词： AA 6061-T6 alloy friction stir welding analysis of variance regression analysis grain size tensile strength

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Effect of polishing parameters on abrasive free chemical mechanical planarization of semi-polar(1122) aluminum nitride surface

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Journal of Semiconductors 2016年第3期37卷 115-121页

作者： Khushnuma Asghar d.das School of Engineering Sciences and Technology University of Hyderabad

An abrasive free chemical mechanical planarization（AFcMP） of semi-polar（1122） Al N surface has been demonstrated. The effect of slurry p H, polishing pressure, and platen velocity on the material removal rate（MRR） and surface quality（RMS roughness） have been studied. The effect of polishing pressure on the AFcMP of the（1122） Al N surface has been compared with that of the（1122） Al Ga N surface. The maximum MRR has been found to be 562 nm/h for the semi-polar（1122） Al N surface, under the experimental conditions of 38 k Pa pressure,90 rpm platen velocity, 30 rpm carrier velocity, slurry p H 3 and 0.4 M oxidizer concentration. The best root mean square（RMS） surface roughness of 1.2 nm and 0.7 nm, over a large scanning area of 0.70×0.96 mm^2, has been achieved on AFcMP processed semi-polar（1122） AlN and（AlGaN） surfaces using optimized slurry chemistry and processing parameters.

关键词： Al N AFcMP chemical mechanical planarization material removal rate surface roughness

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RNA methylation preserves ES cell identity by chromatin silencing of retrotransposons

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Signal Transduction and Targeted Therapy 2021年第8期6卷 2259-2260页

作者： Zhaofa Xu Annabel Ma Yongchao c.Ma departments of Pediatrics Neurology and PhysiologyNorthwestern University Feinberg School of MedicineAnn&Robert H.Lurie Children’s Hospital of ChicagoChicagoILUSA

RNA methylation on N6-methyladenosine(m6A)and histone methylation are critical mechanisms regulating gene expression at epitranscriptomic and epigenetic levels,***,how RNA methylation modulates histone methylation,and in which biological processes,is *** a recent study published in Nature,Liu et al.1 identified the critical roles of m6A and its reader YTHdc1 in mediating histone methylation and chromatin silencing of retrotransposon genes to preserve embryonic stem(ES)cell identity.

关键词： preserve identity.

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coffee:The magical bean for liver diseases

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World Journal of Hepatology 2017年第15期9卷 689-696页

作者： Ryan d Heath Mihir Brahmbhatt Asli c Tahan Jamal A Ibdah Veysel Tahan division of Gastroenterology and Hepatology University of MissouriColumbiaMU 65201United States

coffee has long been recognized as having hepatoprotective properties,however,the extent of any beneficial effect is still being *** appears to reducerisk of hepatocellular carcinoma,reduce advancement of fibrotic disease in a variety of chronic liver diseases,and perhaps reduce ability of hepatitis c virus to *** review aims to catalog the evidence for coffee as universally beneficial across a spectrum of chronic liver diseases,as well as spotlight opportunities for future investigation into coffee and liver disease.

关键词： coffee Hepatocellular carcinoma Liver Hepatitis Fatty liver

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Study of heat transfer and flow of nanofluid in permeable channel in the presence of magnetic field

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Propulsion and Power Research 2015年第1期4卷 50-62页

作者： M.Fakour A.Vahabzadeh d.d.Ganji Young Researchers and Elites club Sari BranchIslamic Azad UniversitySariIran department of Mechanical Engineering Sari BranchIslamic Azad UniversitySariIran

In this paper,laminar fluid flow and heat transfer in channel with permeable walls in the presence of a transverse magnetic field is *** square method(LSM)for computing approximate solutions of nonlinear differential equations governing the *** have tried to show reliability and performance of the present method compared with the numerical method(Runge-Kutta fourth-rate)to solve this *** influence of the four dimensionless numbers:the Hartmann number,Reynolds number,Prandtl number and Eckert number on non-dimensional velocity and temperature profiles are *** results show analytical present method is very close to numerically *** general,increasing the Reynolds and Hartman number is reduces the nanofluid flow velocity in the channel and the maximum amount of temperature increase and increasing the Prandtl and Eckert number will increase the maximum amount of theta.

关键词： Least square method(LSM) Laminar viscous flow Heat transfer Uniform magnetic field channel with porous walls

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development of Palmprint Verification System Using Biometrics

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软件学报 2006年第8期17卷 1824-1836页

作者： G. Shobha M. Krishna S.c. Sharma R.V. college of Engineering Mysore Road Bangalore 560059 India

Palmprint verification system using Biometrics is one of the emerging technologies, which recognizes a person based on the principle lines, wrinkles and ridges on the surface of the palm. These line structures are stable and remain unchanged throughout the life of an individual. More importantly, no two palmprints from different individuals are the same, and normally people do not feel uneasy to have their palmprint images taken for testing. Therefore palmprint recognition offers a promising future for medium-security access control systems. In this paper, a new approach for personal authentication using hand images is discussed. Gray-Scale palm images are captured using a digital camera at a resolution of 640×480. Each of these gray-scale images is aligned and then used to extract palmprint and hand geometry features. These features are then used for authenticating users. The image acquisition setup used here is inherently simple and it does not employ any special illumination nor does it use any pegs that might cause any inconvenience to users. Experimental results show that the designed system achieves an acceptable level of performance.

关键词：灰色图象边缘追踪顶点检测验证系统

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Recent advances based on the synergetic effect of adsorption for removal of dyes from waste water using photocatalytic process

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Journal of Environmental Sciences 2018年第3期30卷 201-222页

作者： Subramanian Natarajan Hari c.Bajaj Rajesh J.Tayade Inorganic Materials and catalysis division (IMcd) CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI)Council of Scientific and Industrial Research (CSIR)

The problem of textile dye pollution has been addressed by various methods,mainly physical,chemical,biological,and *** methods mainly separate and/or remove the dye present in ***,advanced oxidation processes（AOP）have been focused for removal of dye from waste water due to their advantages such as ecofriendly,economic and capable to degrade many dyes or organic pollutant present in *** is one of the advance oxidation processes,mainly carried out under irradiation of light and suitable photocatalytic *** photocatalytic activity of the photocatalytic materials mainly depends on the band gap,surface area,and generation of electron–hole pair for degradation dyes present in *** has been observed that the surface area plays a major role in photocatalytic degradation of dyes,by providing higher surface area,which leads to the higher adsorption of dye molecule on the surface of photocatalyst and enhances the photocatalytic *** present review discusses the synergic effect of adsorption of dyes on the photocatalytic efficiency of various nanostructured high surface area *** addition,it also provides the properties of the water polluting dyes,their mechanism and various photocatalytic materials;and their morphology used for the dye degradation under irradiation of light along with the future prospects of highly adsorptive photocatalytic material and their application in photocatalytic removal of dye from waste water.

关键词： Photocatalysis dye degradation Adsorption Water pollution Advanced oxidation processes Nanomaterials

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Transient growth in Poiseuille-Rayleigh-Bénard flows of binary fluids with Soret effect

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Applied Mathematics and Mechanics(English Edition) 2016年第9期37卷 1203-1218页

作者： Jun HU d.HENRY H.BENHAdId Xieyuan YIN Institute of Applied Physics and computational Mathematics Beijing 100088China Laboratoire de Mecanique des Fluides et d'Acoustique CNRS/Universitd de LyonEcole Centrale de Lyon/universite Lyon 1/INSA de LyonECL36 avenue Guy de Collongue69134 Ecully CedexFrance department of Modern Mechanics University of Science and Technology of ChinaHefei 230027China

The transient growth due to non-normMity is investigated for the Poiseuille- Rayleigh-Benard problem of binary fluids with the Soret effect. For negative separation factors such as ψ = -0.1, it is found that a large transient growth can be obtained by the non-normal interaction of the two least-stable-modes, i.e., the upstream and downstream modes, which determine the linear critical boundary curves for small Reynolds numbers. The transient growth is so strong that the optimal energy amplification factor G（t） is up to 10^2 - 10^3. While for positive separation factors such as ψ = 0.1, the transient growth is weak with the order O（I） of the amplification factor, which can even be computed by the least-stable-mode. However, for both cases, the least-stable-mode can govern the long-term behavior of the amplification factor for large time. The results also show that large Reynolds numbers have stabilization effects for the maximum amplification within moderate wave number regions. Meanwhile, much small negative or large positive separation factors and large Rayleigh numbers can enlarge the maximum transient growth of the pure streamwise disturbance with the wavenumber α= 3.14. Moreover, the initial and evolutionary two-dimensional spatial patterns of the large transient growth for the pure streamwise disturbance are exhibited with a plot of the velocity vector, spanwise vorticity, temperature, and concentration field. The initial three-layer cell vorticity struc- ture is revealed. When the amplification factor reaches the maximum Gmax, it develops into one cell structure with large amplification for the vorticity strength.

关键词： binary fluid Soret effect transient growth Poiseuille-Rayleigh-Benard flow

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Mechanisms of ultraviolet disinfection and chlorination of Escherichia coli： culturability, membrane permeability,metabolism, and genetic damage

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Journal of Environmental Sciences 2018年第3期30卷 356-366页

作者： Limei Xu chongmiao Zhang Pengcheng Xu Xiaochang c.Wang International Science and Technology cooperation center for Urban Alternative Water Resources development China Key Laboratory of Northwest Water Resource Environment and Ecology MOE China Engineering Technology Research center for Wastewater Treatment and Reuse Shaanxi Province China School of Environmental and Municipal Engineering Xi'an University of Architecture and Technology Xi'an 710055 China

Traditional culture methods may underestimate the tolerance of microorganisms to disinfectants because of the existence of viable but nonculturable or sublethally injured cells after *** selection of a strict method is crucial for the evaluation of disinfection *** actions of 2 typical disinfectants–ultraviolet（UV）and chlorine–on the fecal indicator Escherichia coli were investigated by the detection of culturability,membrane permeability,metabolic activity,deoxyribonucleic acid（dNA）,and messenger ribonucleic acid（m RNA）.during UV disinfection,the irreversible damages in the cell membrane and cellular adenosine triphosphate（ATP）were negligible at low UV doses（80 m J/cm^2）.However,membrane permeability was damaged at low doses of chlorine（5 mg/L）,leading to leakage of cellular *** study showed that a slight lesion in dNA was detected even at high doses of UV（400 m J/cm^2）and chlorine（5 mg/L）*** decay of m RNA was more rapid than that of *** degradation level of m RNA depended on the choice of target *** exposure to 50 m J/cm^2UV dose or 5 mg/L chlorine for30 min,the dNA damage repair function（Rec A m RNA）was *** m RNA involved in the dNA damage repair function can be a potential indicator of bacterial viability.

关键词： UV chlorination Membrane damage Adenosine triphosphate dNA mRNA

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