1-Octen-3-ol is a major volatile metabolite produced by mold fungi. When Arabidopsis plants were treated with 1-octen-3-ol, some defense genes that are turned on by wounding or ethylene/jasmonic acid signaling were in...
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Stem cells are defined by both their ability to produce stem cells, a property known as self-renewal, and their ability to give rise to differentiated progeny. One of the hallmarks of tissue stem cell is its adoption ...
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Nicotianamine (NA) is an intermediate in the biosynthetic pathway of the mugineic acid family phytosiderophores (MAs), which are crucial components of the iron acquisition apparatus of graminaceous plants. In non-gram...
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Nicotianamine (NA) is an intermediate in the biosynthetic pathway of the mugineic acid family phytosiderophores (MAs), which are crucial components of the iron acquisition apparatus of graminaceous plants. In non-graminaceous plants, NA is thought to be an essential chelator for metal cation homeostasis. Thus NA plays a key role in Fe metabolism and homeostasis in all higher plants. Nicotianamine synthase (NAS, EC 2.5.1.43) catalyzes the trimerization of S-adenosylmethionine to form one molecule of NA. Barley, a plant that is resistant to Fe deficiency, secretes large amounts of MAs, whereas rice, a plant that is susceptible to Fe deficiency, secretes only small amounts. In this study we isolated a genomic fragment containing HvNAS1 from barley and three rice cDNA clones, osnas1 , osnas2 and osnas3 , from Fe-deficient rice roots. We also isolated a genomic fragment containing both OsNAS1 and OsNAS2 . In contrast to barley, in which Fe deficiency induces the expression of NAS genes only in roots, Fe deficiency in rice induced NAS gene expression in both roots and chlorotic leaves. The amounts of endogenous NA in both the roots and leaves were higher than in barley. We introduced barley genomic DNA fragments containing HvNAS1 with either 9 or 2 kb of the 5′-flanking region into rice, using Agrobacterium -mediated transformation. Fe deficiency induced HvNAS1 expression in both roots and leaves of the transgenic rice, as occurs with rice NAS genes. Barley and rice NAS genes are compared in a discussion of alteration of the NAS genes during adaptation to Fe deficiency.
We consider the solution of complex symmetric shifted linear systems. Such systems arise in large scale electronic structure theory and there is a strong need for the fast solution of the systems. In this paper, we de...
A model for the formation of helical multishell gold nanowires is proposed and is confirmed with quantum mechanical molecular dynamics simulations. The model can explain the magic number of the helical gold nanowires ...
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A model for the formation of helical multishell gold nanowires is proposed and is confirmed with quantum mechanical molecular dynamics simulations. The model can explain the magic number of the helical gold nanowires in the multishell structure. The reconstruction from ideal nonhelical to realistic helical nanowires consists of two stages: dissociations of atoms on the outermost shell from atoms on the inner shell and slip deformations of atom rows generating (111)-like structure on the outermost shell. The elementary processes are governed by competition between energy loss and gain by s and d electrons together with the width of the d band. The possibility for the helical nanowires of platinum, silver, and copper is discussed.
A spatial light phase modulator with a high transmission> 85% (260-1100 nm) and a phase modulation capability of 53 radian at 260 nm and 12 radian at 1100 nm has been developed for the first time.
ISBN:
(纸本)9781424435906
A spatial light phase modulator with a high transmission> 85% (260-1100 nm) and a phase modulation capability of 53 radian at 260 nm and 12 radian at 1100 nm has been developed for the first time.
We developed an angularly dispersed noncollinear optical parametric amplifier with a 300-THz bandwidth (550-1000 nm) for the first time. To the best of our knowledge, this is the broadest parametric gain.
ISBN:
(纸本)9781424435906
We developed an angularly dispersed noncollinear optical parametric amplifier with a 300-THz bandwidth (550-1000 nm) for the first time. To the best of our knowledge, this is the broadest parametric gain.
We consider a parallel method for solving generalized eigen-value problems that arise from molecular orbital computations. We use a moment-based method that finds several eigenvalues and their corresponding eigenvecto...
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