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Wang Ju-Wei,Han Pei-Jie,Han Da-Yong,Zhou Sen,Li Kuan,He Peng-Yu,Zhen Pan,Yu Hui-Xin,Liang Zhen-Rong,Wang Xue-Wei,Bai Feng-Yan 한국미생물학회 2021 The journal of microbiology Vol.59 No.8
The amylolytic yeast Saccharomycopsis fibuligera is a predominant species in starters and the early fermentation stage of Chinese liquor (Baijiu). However, the genetic diversity of the species remains largely unknown. Here we sequenced the genomes of 97 S. fibuligera strains from different Chinese Baijiu companies. The genetic diversity and population structure of the strains were analyzed based on 1,133 orthologous genes and the whole genome single nucleotide polymorphisms (SNPs). Four main lineages were recognized. One lineage contains 60 Chinese strains which are exclusively homozygous with relatively small genome sizes (18.55–18.72 Mb) and low sequence diversity. The strains clustered in the other three lineages are heterozygous with larger genomes (21.85–23.72 Mb) and higher sequence diversity. The genomes of the homozygous strains showed nearly 100% coverage with the genome of the reference strain KPH12 and the sub-genome A of the hybrid strain KJJ81 at the above 98% sequence identity level. The genomes of the heterozygous strains showed nearly 80% coverage with both the sub-genome A and the whole genome of KJJ81, suggesting that the Chinese heterozygous strains are also hybrids with nearly 20% genomes from an unidentified source. Eighty-three genes were found to show significant copy number variation between different lineages. However, remarkable lineage specific variations in glucoamylase and α-amylase activities and growth profiles in different carbon sources and under different environmental conditions were not observed, though strains exhibiting relatively high glucoamylase activity were mainly found from the homozygous lineage.
Wang, Gui-Ping,Hui, Zhen,Li, Feng,Zhao, Mei-Rong,Zhang, Jin,Wang, Wei The Korean Society of Plant Biotechnology 2010 Plant biotechnology reports Vol.4 No.3
Within their natural habitat, crops are often subjected to drought and heat stress, which suppress crop growth and decrease crop production. Causing overaccumulation of glycinebetaine (GB) has been used to enhance the crop yield under stress. Here, we investigated the response of wheat (Triticum aestivum L.) photosynthesis to drought, heat stress and their combination with a transgenic wheat line (T6) overaccumulating GB and its wild-type (WT) Shi4185. Drought stress (DS) was imposed by controlling irrigation until the relative water content (RWC) of the flag leaves decreased to between 78 and 82%. Heat stress (HS) was applied by exposing wheat plants to $40^{\circ}C$ for 4 h. A combination of drought and heat stress was applied by subjecting the drought-stressed plants to a heat stress as above. The results indicated that all stresses decreased photosynthesis, but the combination of drought and heat stress exacerbated the negative effects on photosynthesis more than exposure to drought or heat stress alone. Drought stress decreased the transpiration rate (Tr), stomatal conductance (Gs) and intercellular $CO_2$ concentration (Ci), while heat stress increased all of these; the deprivation of water was greater under drought stress than heat stress, but heat stress decreased the antioxidant enzyme activity to a greater extent. Overaccumulated GB could alleviate the decrease of photosynthesis caused by all stresses tested. These suggest that GB induces an increase of osmotic adjustments for drought tolerance, while its improvement of the antioxidative defense system including antioxidative enzymes and antioxidants may be more important for heat tolerance.
Feng Chen,Xue-Lin Wang,Ke-Ming Wang,Zhen-Xiang Cheng,Huan-Chu Chen,Ding-Yu Shen 한국진공학회(ASCT) 2002 Journal of Korean Vacuum Science & Technology Vol.6 No.2
NaEr(WO₄)₂ is a new laser material. The planar optical waveguide was formed in NaEr(WO₄)₂ crystal by 2.6 MeV He^+ ion implantation at doses of 1.0-1.5×10^(16) ions/㎤ at room temperature. The effective refractive indices of the dark modes were measured using the prism coupling method. Four TE modes and five TM modes were observed in the waveguide. The refractive index profiles were analyzed using the reflectivity calculation method (RCM). The influence of heat treatment at moderate temperature on the refractive index profiles of the waveguide was also investigated. We used the TRIM’98 (Transport of Ions in Matter) code to simulate the damage profile in the NaEr(WO₄)₂ crystal by 2.6 MeV He^+ ion implantation which is helpful for a better understanding of the waveguide formation.
Zhen Wang,,Feng Ye 경남대학교 극동문제연구소 2019 ASIAN PERSPECTIVE Vol.43 No.3
Since Sri Lanka and the People’s Republic of China established diplomatic relations in the 1950s, China has become an important partner of Sri Lanka in the latter’s cause of maintaining national independence and development. Meanwhile, Sri Lanka has been an important political and diplomatic partner for China in the Third World. Since Chinese president Xi Jinping proposed the Belt and Road Initiative (BRI) in 2013, Sri Lanka has become a new investment hot spot due to its location as a hub of the proposed 21st-Centrury Maritime Silk Road. This article provides views identifying the opportunities and potential challenges for Sino–Sri Lankan relations under the framework of China’s 21st-Century Maritime Silk Road initiative.
Rockburst occurrences and microseismicity in a longwall panel experiencing frequent rock bursts
Zhen-lei Li,Xue-qiu He,Lin-ming Dou,Gui-feng Wang 한국지질과학협의회 2018 Geosciences Journal Vol.22 No.4
A rockburst is a kind of dynamic geological hazard faced by engineers and researchers. Identification of a potential rockburst risk area (PRBRA) allows effective, targeted measures to be taken mitigate these hazards. To provide a reference for determining PRBRA in longwall panels with similar conditions, an in situ investigation that lasted for over three years was conducted on LW3401 in the Junde coal mine which experienced a total of 22 rockbursts. The investigation involves rockburst consequences (including the location, length, degree, and modes of the ensuing damage), seismic features of rockburst (including the source and seismic energy), and the relationship between rockbursts and microseismicity. Results show that damaged areas are mostly within the 18 m behind the excavation face, or up to 30 m ahead of the coalface. Lengths of damaged sections of roadways are within 95 m (and 115 m) during roadway excavation (and coalface advancing operations). The seismic energy of rockbursts ranges from 1.60 × 104 to 8.21 × 106 J. Sources of rockbursts lie mostly within 145 m of damage locations. Before a rockburst, sources of microseismic (MS) events begin to cluster around the roadway or coalface. Daily total energy and MS event counts rose, then fell, before a rockburst occurred. PRBRAs in a roadway lie within a certain distance behind the excavation face, or ahead of the coalface. When high-energy MS events are found in close proximity to a PRBRA, the rockburst risk in a given panel increases.