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Thị Trấn Cổ Lễ, Vietnam

We construct a new version for the 3-3-1 model based on T7 flavor symmetry where the left-handed leptons under T7 differ from those of our previous work while the SU(3)C ⊗SU(3)L⊗U(1)X gauge symmetry is retained. The flavor mixing patterns and mass splitting are obtained without perturbation. The realistic lepton mixing can be obtained if both the direction of breakings T7 →Z3 and Z3 →{Identity} are taken place in neutrino sector. Maximal CP violation is predicted and Cabibbo-Kobayashi-Maskawa (CKM) matrix is the identity matrix at the tree-level. © 2014 World Scientific Publishing Company. Source

We propose a new D4 flavor model based on SU(3) C⊗SU(3)L ⊗U(1)X gauge symmetry responsible for fermion masses and mixings in which all fermion fields act only as singlets under D4 which differs from our previous work. The neutrinos get small masses from two SU(3)L anti-sextets and one SU(3)L triplet which are all in singlets under D4. If a SU(3)L Higgs triplet, lying in $\underline{1}"'$ under D4, is considered as a perturbation the corresponding neutrino mass mixing matrix gets the most general form. In this case, the model can fit the most recent data on neutrino masses and mixing with nonzero θ13. Our results show that the neutrino masses are naturally small. The sum of three light neutrino masses and the effective mass governing neutrinoless double beta decay are obtained that are consistent with the recent data. © 2014 World Scientific Publishing Company. Source

Vien V.V.,Tay Nguyen University | Long H.N.,Vietnam Academy of Science and Technology
Journal of the Korean Physical Society

The D4 flavor model based on SU(3)C ⊗SU(3)L⊗U(1)X gauge symmetry that aims at describing quark mass and mixing is updated. After spontaneous breaking of flavor symmetry, with the constraint on the Higgs vacuum expectation values (VEVs) in the Yukawa couplings, all of quarks have consistent masses, and a realistic quark mixing matrix can be realized at the first order of perturbation theory. © 2015, The Korean Physical Society. Source

Nguyen Le T.-N.,Tay Nguyen University | Byeon Y.,Chonnam National University | Kim Y.S.,Chonnam National University | Back K.,Chonnam National University
Journal of Pineal Research

The regulation of reproduction-stage inducible melatonin biosynthesis in rice (Oryza sativa cv. Dongjin) was investigated. The flag leaf and panicle (flower) were collected from field-grown rice at three different reproductive stages: the preflowering stage, flowering stage, and postflowering stage. Melatonin synthesis was induced in the panicle, whereas no induction was observed in the flag leaf during the reproductive stages. The panicle displayed a peak melatonin level of 0.4 ng/g fresh weight (fw), which was six times that found in the flag leaf. The induction of melatonin biosynthesis was paralleled by the induction of corresponding genes and proteins such as tryptophan decarboxylase, tryptamine 5-hydroxylase, and N-acetylserotonin methyltransferase. In addition, melatonin induction was preceded by the accumulation of its precursor, tryptophan, in the panicle. These results suggest that the induction of melatonin during flower development is regulated by the transcriptional control of its biosynthesis genes and that melatonin may participate in flower development. © 2012 John Wiley & Sons A/S. Source

Dzung N.A.,Tay Nguyen University | Khanh V.T.P.,Sudan University of Science and Technology | Dzung T.T.,The International University of Management
Carbohydrate Polymers

Effects of chitosan and chitosan oligomer solutions on biophysical characteristics, growth, development and drought resistance of coffee have been investigated. The experiments which involved spraying chitosan and chitosan oligomer onto the leaves of coffee were conducted in a greenhouse and in the field. The concentration of chitosan and chitosan oligomer solution used was 0, 20, 40, 60 and 80 ppm. Obtained results showed that chitosan oligomer enhanced strongly the content of chlorophylls and carotenoid in the leaves of coffee seedlings up to 46.38-73.51% compared to the greenhouse control. Application of chitosan oligomers also increased mineral uptake of coffee and stimulated the growth of coffee seedlings. Spraying chitosan oligomers with concentration of 60 ppm increased the height of the coffee seedlings up to 33.51%, in the stem diameter up to 30.77% and the leaf in area by up to 60.53%. In addition application of chitosan oligomers reduced by 9.5-25.1% transpiration of the leaves at 60 and 120 min. Therefore the application of chitosan oligomer could be a good way of increasing the drought resistance of coffee seedlings. Application of chitosan oligomer in field conditions increased content of total chlorophylls up to 15.36% compared to the control. Application of chitosan oligomers also enhanced mineral uptake of coffee by 9.49% N; 11.76% P; 0.98% K; 18.75% Mg; 3.77% Ca and decreased 15.25% the rate of fallen fruits compared to the control, contributed to increasing yield and developing sustainable production of coffee in Vietnam. © 2011 Elsevier Ltd. All rights reserved. Source

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