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4 results on '"G.J. SU"'

1. Genome-wide identification and expression analysis of the AhTrx family genes in peanut

Author

X. LI, G.J. SU, A. NTAMBIYUKURI, B. TONG, J. ZHAN, A.Q. WANG, D. XIAO, and L.F. HE

Subjects
aluminium stress, arachis hypogea, chromosomal localization, expression analysis, gene structure, peanut, thioredoxins, Biology (General), QH301-705.5, Plant ecology, QK900-989
Abstract

Thioredoxins (Trx) are small multifunctional redox proteins that contain thioredoxin conserved domain and active site WCXXC. The Trx family has an important role in multiple processes, including electron transport, seed germination, redox regulation, biotic and abiotic stresses resistance, etc. Although Trx genes have been extensively characterized in some plants, they have not been reported in peanut until now. The identification of AhTrx genes provides potential candidate genes for studying their effects and regulatory mechanisms in peanut (Arachis hypogaea L.) growth and development, especially under aluminium (Al) stress. It is also helpful to further analyze the Al resistance pathway in plants. Seventy AhTrx genes were identified using a genome-wide search method and conservative domain analysis. Then the basic physicochemical properties, phylogenetic relationship, gene structure, chromosomal localization, and promoter prediction were studied by the bioinformatic methods. Furthermore, the expressions of AhTrx genes under different Al treatment times in two peanut cultivars were tested using a real-time quantitative polymerase chain reaction. Seventy AhTrx genes were identified and characterized. Phylogenetic tree analysis showed that all AhTrx members could be classified into 9 groups with different conserved domains. Motif 1 was found to exist in every sequence, with an active site. Furthermore, the gene structures showed that the AhTrx family was complicated and changeable during evolution. The chromosomal localization indicated that the distribution and density of the Trx family on 20 peanut chromosomes were uneven. Predictive promoter analysis indicated that AhTrx proteins might play a role in phytohormones synthesis and stress response. Finally, the expression patterns of the AhTrx genes showed that every gene was differently expressed under Al treatment in different peanut cultivars, some were obvious, others had no significant difference, some were at a high level, while others were at a low level. This study systematically identifies the Trx gene family in peanut, providing some candidates for further study on its effects and regulatory mechanism under Al stress in peanut.

Published
2022
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2. Toward 99% efficiency for transistor inverters

Author

J. Itoh, I. Takahashi, and G.J. Su

Subjects
Engineering, Heterostructure-emitter bipolar transistor, business.industry, Bipolar junction transistor, Transistor, Electrical engineering, Energy Engineering and Power Technology, Multiple-emitter transistor, Insulated-gate bipolar transistor, Industrial and Manufacturing Engineering, law.invention, Darlington transistor, Current injection technique, Control and Systems Engineering, law, Hardware_INTEGRATEDCIRCUITS, Electronic engineering, Field-effect transistor, Electrical and Electronic Engineering, business
Abstract

Developments in power switching devices have been made toward reducing the conduction drop and improving the switching characteristics, in order to meet the demanding requirements for high efficiency. On the other hand, many efforts have been made to reduce the switching losses. Since bipolar junction transistors (BJTs) have the lowest on-state drops among those existing semiconductor switches with turn-off capability, BJTs are most suitable for realizing inverters of high efficiency at power levels under a few hundred kVA. However in the Darlington structure, there is higher on-state drop due to the driver transistors. It is therefore important to reduce the on-state drop in order to realize high efficiency with the Darlington transistors. In this article, two methods are proposed to greatly reduce their on-state drops. Firstly, a base drive circuit is presented that provides a direct drive to the output transistor of a Darlington transistor rather than through its driver transistors. To eliminate the disadvantage related to the direct base drive, an on-state drop cancellation method is then proposed, in which a DC voltage source is inserted in series with the driver transistor of a Darlington transistor to offset its on-state drop.

Published
1996

4. Infrared spectra of glass network formers and their interpretations

Author

N.F. Borrelli and G.J. Su

Subjects
Theoretical physics, Mechanics of Materials, Simple (abstract algebra), Chemistry, Infrared, Physical reality, Mechanical Engineering, Infrared spectroscopy, General Materials Science, Condensed Matter Physics, Lattice model (physics), Optical spectra, Characterization (materials science)
Abstract

The theoretical characterization of the optical spectra of simple glasses is not presently possible. However, considerable infrared data, exists in the literature, and attempts have been made to interpret these data by two approximate methods: 1) localized model, assume a vibrating unit and treat it in a rigid environment; 2) lattice model, assume a vibrating unit and treat it as one would the unit cell in the plane-wave method. The physical reality of these two approaches will be discussed in light of recent experimental and theoretical developments.

Published
1968

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