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| 1 | Nitric Oxide Reduces Hydrogen Peroxide Accumulation Involved in Water Stress-induced Subcellular Anti-oxidant Defense in Maize Plants显示文摘Nitric oxide (NO) is a bioactive molecule involved in many biological events, and has been reported as pro-oxidant as well as anti-oxidant in plants. In the present study, the sources of NO production under water stress, the role of NO in water stress-induced hydrogen peroxide (H2O2) accumulation and subcellular activities of anti-oxidant enzymes in leaves of maize (Zea mays L.) plants were investigated. Water stress induced defense increases in the generation of NO in maize mesphyll cells and the activity of nitric oxide synthase (NOS) in the cytosolic and microsomal fractions of maize leaves. Water stress-induced defense increases in the production of NO were blocked by pretreatments with inhibitors of NOS and nitrate reductase (NR), suggesting that NO is produced from NOS and NR in leaves of maize plants exposed to water stress. Water stress also induced increases in the activities of the chloroplastic and cytosolic anti-oxidant enzymes superoxide dismutase (SOD), ascorbate peroxidase (APX), and glutathione reductase (GR), and the increases in the activities of anti-oxidant enzymes were reduced by pretreatments with inhibitors of NOS and NR. Exogenous NO increases the activities of water stress-induced subcellular anti-oxidant enzymes, which decreases accumulation of H2O2. Our results suggest that NOS and NR are involved in water stress-induced NO production and NOS is the major source of NO. The potential ability of NO to scavenge H2O2 is, at least in part, due to the induction of a subcellular anti-oxidant defense. | Jianrong Sang Mingyi Jiang Fan Lin Shucheng Xu Aying Zhang Mingpu Tan | 2008 | Journal of Integrative Plant Biology2008，50，2： | 15 |
| 2 | Cross-talk between calcium-calmodulin and nitric oxide in abscisic acid signaling in leaves of maize plants显示文摘用药理学和生物化学的途径,在过氧化氢( H ( 2 ) O ( 2 ))之间的发信号的小径,钙( Ca (2+)) -calmodulin (凸轮),并且氮的氧化物(没有)在 abscisic 酸(骆驼毛的织物),导致的抗氧化剂防卫在玉米( Zea mays L.)的叶子被调查植物。有骆驼毛的织物, H (2 ) O (2 ) ,和 CaCl (2 ) 的处理在产生导致了增加不,在玉米叶肉房间和氮的氧化物的活动,在 cytosolic 和玉米的 microsomal 部分的 synthase (NOS ) 离开。然而,如此的增加被预告的处理与 Ca (2+) 禁止者和凸轮对手堵住。同时, Ca (2+)导致了的有也压制的二个 NOS 禁止者的预告的处理在另一方面在号码的生产增加,有骆驼毛的织物和 NO 施主钠 nitroprusside ( SNP )的处理也在叶肉房间的原物并且在 calmodulin 的表示在 cytosolic Ca (2+)的集中导致了增加 1 ( CaM1 )基因和在玉米的叶子的凸轮的内容种,并且骆驼毛的织物导致的增加被预告的处理减少与一没有 scavenger 和一个 NOS 禁止者。而且,抗氧化剂基因的表示的 导致SNP 的增加超级氧化物 dismutase 4 ( SOD4 ), cytosolic ascorbate 过氧化物酶(帽子 X ),并且谷胱甘肽 reductase 1 ( GR1 )并且 chloroplastic 和 cytosolic 抗氧化剂酶的活动被预告的处理与 Ca (2+)禁止者和凸轮对手逮捕。我们的结果建议那个 Ca (2+) 凸轮没有生产在上游、下游的功能,主要来自 NOS,导致骆驼毛的织物并且 H (2 ) O (2 ) 在玉米植物的叶子导致了抗氧化剂防卫。 | Jianrong Sang Aying Zhang Fan Lin Mingpu Tan Mingyi Jiang | 2008 | Cell Research2008，18，5： | 6 |
| 3 | Creating locally interacting Hamiltonians in the synthetic frequency dimension for photons显示文摘The recent emerging field of synthetic dimension in photonics offers a variety of opportunities for manipulating different internal degrees of freedom of photons such as the spectrum of light.While nonlinear optical effects can be incorporated into these photonic systems with synthetic dimensions,these nonlinear effects typically result in long-range interactions along the frequency axis.Thus,it has been difficult to use the synthetic dimension concept to study a large class of Hamiltonians that involves local interactions.Here we show that a Hamiltonian that is locally interacting along the synthetic dimension can be achieved in a dynamically modulated ring resonator incorporatingχ3nonlinearity,provided that the group velocity dispersion of the waveguide forming the ring is specifically designed.As a demonstration we numerically implement a Bose–Hubbard model and explore photon blockade effect in the synthetic frequency space.Our work opens new possibilities for studying fundamental many-body physics in the synthetic space in photonics,with potential applications in optical quantum communication and quantum computation. | LUQI YUAN AVIK DUTT MINGPU QIN SHANHUI FAN AND XIANFENG CHEN | 2020 | Photonics Research2020，8，9： | 1 |
| 4 | Effect of chemical composition on zircon radiation damage dating:Implications for low-temperature thermochronology显示文摘Zircon radiation damage dating is a low-temperature thermochronological method that can reveal the cooling histories of magmatic intrusions and discriminate sedimentary provenance in combination with other dating methods.This method has broad application prospects because of its advantages of nondestructive,high efficiency,and capable of double(or multiple)dating,involving only multiple measurements by Raman spectrometer and laser ablation-inductively coupled plasma-mass spectrometry.However,several factors,such as zircon chemical composition and the non-uniformity of radiation damage annealing kinetics,can cause poor precision when using this method and thus restricts its wide application.This study examined the effect of chemical composition(P,Ti,Dy,Th,U,and Hf)on Raman spectra using synthetic zircon crystals grown in a lithium-molybdate flux.The results show that the full width at half-maximum(FWHM)of the v_(3)(SiO_(4))band has positive linear correlations with the concentrations of P,Ti,Dy,Th,and U in decreasing order of influence,while the FWHM is unaffected by Hf at concentrations<1 wt.%but increases at concentrations>10 wt.%.Furthermore,the Raman shift is negatively correlated with Th,U,and Dy concentrations,positively correlated with Hf,and shows no obvious correlation with Ti and P.Thus,our study shows that chemical composition is a non-ignorable factor for calculating zircon radiation damage age using Raman spectroscopy,especially for zircon with relatively high concentrations of P,rare earth elements(REEs),Th,U,and Hf.The obtained multiple linear regression equation provides a potential means for estimating the FWHM at zero dose and implication for improving the dating precision of this method.In addition,the observed effects of REEs,Th,U,and Hf on the Raman shift of the v_(3)(SiO_(4))band indicate that chemical composition in zircon might affect the estimation of the P-T conditions of geological processes when using entrapped zircon inclusions in host minerals or the field of zircon as an in situ pressure sensor in hydrothermal experiments.Our study suggests that zircon radiation damage dating,excluding geochemical effects,will be more accurate for addressing lower-temperature geological processes. | Mingpu Fan Xiaoming Liu Shengsi Sun Yunpeng Dong John C.Ayers M.Santosh | 2023 | Geoscience Frontiers2023，14，6： | 0 |
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