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Efect of Heat Stress on Sargassum fusiforme Leaf Metabolome
Lijie Liu,Lidong Lin 한국식물학회 2020 Journal of Plant Biology Vol.63 No.3
Temperature is a major environmental factor afecting the growth, development, and productivity of Sargassum fusiforme. We aimed to assess the metabolic processes and regulatory mechanisms in S. fusiforme during a 7-day high-temperature (27 °C and 32 °C) experiment. Changes in chlorophyll content and electrolyte leakage after high-temperature treatment were investigated. Metabolic changes in the leaves of S. fusiforme were analysed using gas chromatography–mass spectrometry. High temperatures suppressed chlorophyll content and increased electrolyte leakage. Further, a strong modulation of various metabolisms was observed: organic acids, amino acids, sugars or sugar alcohols, esters, and amines. These metabolisms were signifcantly enriched in ten pathways under the 27 °C treatment: aminoacyl-tRNA biosynthesis; glycine, serine, and threonine metabolism; alanine, aspartate, and glutamate metabolism; valine, leucine, and isoleucine biosynthesis; cyanoamino acid metabolism; cysteine and methionine metabolism; arginine and proline metabolism; tyrosine metabolism; citrate cycle (TCA cycle); and glucosinolate biosynthesis. The various metabolisms signifcantly enriched seven pathways under the 32 °C treatment, namely, alanine, aspartate, and glutamate metabolism; aminoacyl-tRNA biosynthesis; phenylalanine metabolism; tyrosine metabolism; arginine and proline metabolism; nitrogen metabolism; and isoquinoline alkaloid biosynthesis. These changes in metabolic pathways may contribute to the tolerance and adaptability of S. fusiforme to high-temperature stress.
Periodicity and attractivity for a rational recursive sequence
Lijie Zhang,Guang Zhang,Hui Liu 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.19 No.1-2
In this paper, the existence of periodic positive solution and the attractivity are investigated for the rational recursive sequence xn+1 =(A + axn−k)/(b + xn−l), where A, a and b are real numbers, k and l are nonnegative integer numbers.
No-Load Power of Disc Refiner in Low Consistency Refining
Huan LIU,Jixian DONG,Xiya GUO,Bo Wang,Qiao Lijie,Chuanwu DUAN,Kai QI,Lingbo Kong 한국펄프·종이공학회 2020 펄프.종이기술 Vol.52 No.2
Disc refiner is the key equipment in pulping and papermaking process, and the no-load power of disc refiner will directly affect the refining efficiency. So the refining efficiency and energy saving of the refining process will be promoted through theoretical and experimental study on it. In this paper, the measurement and the theoretical calculation method of the no-load power of disc refiner in low consistency refining were summarized. And the effects of pulp properties, control parameters and bar parameters of refining plate on no-load power were analyzed. The main research direction of the no-load power of disc refiner was proposed which has a positive significance on energy saving and pulp quality improvements of refining process.
Parametric Design and Performance Characteristic of Isometric Curved Bar Plate Based on SEL and SSL
Huan Liu,Jixian Dong,Chuanwu Duan,Ruifan Yang,Xiya Guo,Bo Wang,Kai Qi,Lijie Qiao,Sha Wang 한국펄프·종이공학회 2019 펄프.종이기술 Vol.51 No.5
Curved bar plate is common used in the pulp refining, but its design method is rather vague due it complex shape. A design method of isometric curved bar plate using two main parameters, the starting point and bar angle of central curve, was proposed in this paper and the calculation of characterization parameters of specific edge load (SEL) and specific surface load (SSL) was described. Isometric curved bar plates designed by two methods, one with fixed starting point and various bar angles and another with fixed bar angle and various starting points, were analyzed by characterization parameters of SEL and SSL. It would be expected to design isometric curved bar plate by the first method and the SEL would be a useful refining intensity to measure it in actual refining, however, the refining characteristics of different isometric curved bar plates should be further studied. The study on the design of isometric curved bar plate would be conductive to the research of curved bar plate and rapid design of it.
Chunping Liu,Chong Guo,Jiayou Cai,Jiaxing Song,Xiujun Lu,Lijie Zhang 강원대학교 산림과학연구소 2022 강원대학교 산림과학연구소 학술대회 Vol.2022 No.10
Juglans mandshurica is a precious timber and economic tree species. The species is monoecious heterodichogamous with protogynous and protandrous mating strategies that occur at a 1:1 ratio and are randomly distributed in the population. The inconsistent male and female flowering periods of the same mating type result in the low yield of this species. In this study, the morphological and anatomical development of the male and female flowers of J. mandshurica were analyzed by histological and scanning electron microscopy analysis. In addtion, the crucial gene involved in plant flowering, LEAFY (LFY) was cloned from J. mandshurica by homologous cloning, and the expression analysis of JmLFY in different organs at various developmental stages and its genetic transformation and functional verification were also conducted. The results revealed that the male floral morphological development of J. mandshurica was divided into seven phases, while that of the female flower was nine. Four stages were shared between the male and female flower’s anatomical development. These results indicate that there was minimal overlap between sexual functions within the same mating type, guaranteeing synchronization, mutual non-interference, outcrossing, and avoidance of self-fertilization. Overexpression of JmLFY gene promoted the expression of flowering related genes (such as AtAP1、AtSOC1 and AtPI) and the transformation from vegetative growth to reproductive growth in Arabidopsis, promoted the flowering about 8d in advance. These results provide a theoretical basis for improving fruit yield and quality by artificial pollination control, shortening childhood and allocating protogynous and protandrous individuals in a population reasonably.
Characterization of the Parameters for the Refining Intensity in Terms of Performance
Huan Liu,Jixian Dong,Hui Jing,Xiya Guo,Lijie Qiao 한국펄프·종이공학회 2019 펄프.종이기술 Vol.51 No.2
Refining intensity is typically used to measure the efficiency of refining in the pulp and paper industry, and the refining intensity is difficult to analyze due to the various parameters influencing it. In this paper, the previously published refining intensities of a disc refiner were analyzed, and the characterization parameters were proposed. Based on the bar interactions, the refining intensity was established using theoretical derivation. The cut edge length (CEL), the CEL-based characterization parameters and bar interactions (BI) characterization parameters were used to show that the CEL directly reflected the number of bar interaction points, but it had no direct relationship with the bar interaction area (BIA) and bar interaction length (BIL). By analyzing the relationship between the different refining intensities and the properties of the fibers or pulp, it could be concluded that the specific refining energy (SRE) better reflected the variations in the beating degree of the pulp during the refining process compared with the specific surface load (SSL) and BI-based refining intensities. Also, the intensity based on the bar interaction length (BIL) can better characterize the changes in the average fiber length. However, all the intensities analyzed in this paper do not comprehensively describe the refining process and cannot predict all the parameters of the pulp and fibers but only partly characterize their properties. Therefore, further studies are required to establish a more comprehensive and precise measure of refining intensity.