Mitochondrial DNA variation and phylogeography of Old World camels

Ming Liang,Siren Dalai,Yi Li,Hai Le,He Jing,Ji Rimutu 아세아·태평양축산학회 2021 Animal Bioscience Vol.34 No.4

Objective: Old World camels are a valuable genetic resource for many countries around the world due to their adaptation to the desert environment. At present, Old World camels have encountered the challenge of unprecedented loss of genetic resources. Through our research, we would reveal the population structure and genetic variation in Old World camel populations, which provides a theoretical basis for understanding the germplasm resources and origin and evolution of different Old World camel populations. Methods: In the present study, we assessed mtDNA control region sequences of 182 individuals from Old World camels to unravel genetic diversity, phylogeography, and demographic dynamics. Results: Thirty-two haplotypes confirmed by 54 polymorphic sites were identified in the 156 sequences, which included 129 domestic and 27 wild Bactrian camels. Meanwhile, 14 haplotypes were defined by 47 polymorphic sites from 26 sequences in the dromedaries. The wild Bactrian camel population showed the lowest haplotype and nucleotide diversity, while the dromedaries investigated had the highest. The phylogenetic analysis suggests that there are several shared haplotypes in different Bactrian camel populations, and that there has been genetic introgression between domestic Bactrian camels and dromedaries. In addition, positive values of Tajima’s D and Fu’s Fs test demonstrated a decrease in population size and/or balancing selection in the wild Bactrian camel population. In contrast, the negative values of Tajima’s D and Fu’s Fs test in East Asian Bactrian camel populations explained the demographic expansion and/or positive selection. Conclusion: In summary, we report novel information regarding the genetic diversity, population structure and demographic dynamics of Old World camels. The findings obtained from the present study reveal that abundant genetic diversity occurs in domestic Bactrian camel populations and dromedaries, while there are low levels of haplotype and nucleotide diversity in the wild Bactrian camel population. Objective: Old World camels are a valuable genetic resource for many countries around the world due to their adaptation to the desert environment. At present, Old World camels have encountered the challenge of unprecedented loss of genetic resources. Through our research, we would reveal the population structure and genetic variation in Old World camel populations, which provides a theoretical basis for understanding the germplasm resources and origin and evolution of different Old World camel populations.Methods: In the present study, we assessed mtDNA control region sequences of 182 individuals from Old World camels to unravel genetic diversity, phylogeography, and demographic dynamics.Results: Thirty-two haplotypes confirmed by 54 polymorphic sites were identified in the 156 sequences, which included 129 domestic and 27 wild Bactrian camels. Meanwhile, 14 haplotypes were defined by 47 polymorphic sites from 26 sequences in the dromedaries. The wild Bactrian camel population showed the lowest haplotype and nucleotide diversity, while the dromedaries investigated had the highest. The phylogenetic analysis suggests that there are several shared haplotypes in different Bactrian camel populations, and that there has been genetic introgression between domestic Bactrian camels and dromedaries. In addition, positive values of Tajima’s D and Fu’s <i>Fs</i> test demonstrated a decrease in population size and/or balancing selection in the wild Bactrian camel population. In contrast, the negative values of Tajima’s D and Fu’s <i>Fs</i> test in East Asian Bactrian camel populations explained the demographic expansion and/or positive selection.Conclusion: In summary, we report novel information regarding the genetic diversity, population structure and demographic dynamics of Old World camels. The findings obtained from the present study reveal that abundant genetic diversity occurs in domestic Bactrian camel populations and dromedaries, while there are low levels of haplotype and nucleotide diversity in the wild Bactrian camel population.

A Novel Method for Survivability Test Based on End Nodes in Large Scale Network

( Ming Liang ),( Zhao Gang ),( Wang Dongxia ),( Huang Minhuan ),( Li Xiang ),( Miao Qing ),( Xu Fei ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.2

Survivability is a necessary property of network system in disturbed environment. Recovery ability is a key actor of survivability. This paper concludes network survivability into a novel composite metric, i.e. Network Recovery Degree (NRD). In order to measure this metric in quantity, a concept of Source-Destination Pair (SD Pair), is created to abstract end-to-end activity based on end nodes in network, and the quality of SD Pair is also used to describe network performance, such as connectivity, quality of service, link degree, and so on. After that, a Survivability Test method in large scale Network based on SD pairs, called STNSD, is provided. How to select SD Pairs effectively in large scale network is also provided. We set up simulation environment to validate the test method in a severe destroy scenario and evaluate the method scalability in different large scale network scenarios. Experiment and analysis shows that the metric NRD correctly reflects the effort of different survivability strategy, and the proposed test method STNSD has good scalability and can be used to test and evaluate quantitative survivability in large scale network.

Numerical Simulation of Condensation Heat Transfer and Structural Optimization in Dryer of Paper Machine

Mingliang-Zheng 한국펄프·종이공학회 2020 펄프.종이기술 Vol.52 No.4

Exploring the Trend of Ski Using Social Network Analysis: International Journal Analysis

( Mingliang Zhang ),( Kyungsik Kim ) 아시아스포츠융합과학회 2021 Asia Pacific Journal of Applied Sport Sciences Vol.2 No.3

PURPOSE This study aimed to investigate: 1) the change of the key research keywords by period; 2) the key symbolic keywords that represent 20 years of ski research; 3) the sub-research area of ski research. METHOD We searched international journal articles on Web of Science websites and used bibliometrics and keyword networks to determine ski related research trends. To this end, we researched ski sub-research areas of 873 papers published between 2000 and 2019 in 69 international journals involving ski research. This study used python for bibliometrics and word frequency statistics, and centrality analysis cohesion analysis for Netminer. RESULT There have been changes in the keywords for ski research in different time periods. Keywords such as skiing, injury, skier, sports, athlete, training etc. were important in the 2000s. In 2010s, keywords such as speed, strength, women, system, jumping were deemed to be important. In the 2000s, co-words such as knee-injury, sport-injury, ski-downhill, injury-pattern were important, while co-words such as cup-world, level-skill, female-male, illness-injury were particularly important in the 2010s. In the past 20 years, ski research has mainly focused on three major projects’ analysis: cross-country skiing, alpine skiing, and snowboarding. Ski, skier, injury, performance, athlete, sport, time, training have been the core keywords of ski research in the past 20 years. Co-words such as alpine-ski, cross country-skier, alpine-skier are research priorities in the ski field. These keywords represent the research direction in the ski field and development trends. Finally, sub-research area of ski includes four groups: ski and measure, ski and training, ski risk and injury, and ski and technique. CONCLUSION A few core keywords have made a relatively large contribution to the formation of ski knowledge structure; keyword network analysis provides new ideas and research methods for exploring the ski structure and development trends, which is a major academic breakthrough.

The Model and Experiment for Heat Transfer Characteristics of Nanoporous Silica Aerogel

Mingliang, Zheng Materials Research Society of Korea 2020 한국재료학회지 Vol.30 No.4

Nanoporous silica aerogel insulation material is both lightweight and efficient; it has important value in the fields of aerospace, petrochemicals, electric metallurgy, shipbuilding, precision instruments, and so on. A theoretical calculation model and experimental measurement of equivalent thermal conductivity for nanoporous silica aerogel insulation material are introduced in this paper. The heat transfer characteristics and thermal insulation principle of aerogel nano are analyzed. The methods of SiO₂ aerogel production are compared. The pressure range of SiO₂ aerogel is 1Pa-atmospheric pressure; the temperature range is room temperature-900K. The pore diameter range of particle SiO₂ aerogel is about 5 to 100 nm, and the average pore diameter range of about 20 ~ 40 nm. These results show that experimental measurements are in good agreement with theoretical calculation values. For nanoporous silica aerogel insulation material, the heat transfer calculation method suitable for nanotechnology can precisely calculate the equivalent thermal conductivity of aerogel nano insulation materials. The network structure is the reason why the thermal conductivity of the aerogel is very low. Heat transfer of materials is mainly realized by convection, radiation, and heat transfer. Therefore, the thermal conductivity of the heat transfer path in aerogel can be reduced by nanotechnology.

A Rectangular Groove-Loaded Folded Waveguide for Millimeter-Wave Traveling-Wave Tubes

Mingliang Liao,Yanyu Wei,Yubin Gong,Jun He,Wenxiang Wang,Gun-Sik Park IEEE 2010 IEEE transactions on plasma science Vol.38 No.7

<P>A folded waveguide (FW) is a promising slow-wave structure (SWS) for millimeter-wave traveling-wave tubes (TWTs) with the advantages of high power and considerable bandwidth. A novel rectangular groove-loaded FW SWS is analyzed for the purpose of gaining higher power with a smaller size compared with the normal circuit. The high-frequency characteristics, including dispersion properties and interaction impedance, are investigated by numerical simulation, and the nonlinear large-signal performance of such a TWT is also analyzed by a 3-D particle-in-cell code MAGIC3D. Compared with a normal circuit, larger gain and electronic efficiency together with notably higher output power at a Ka-band are predicted by the simulation. Meanwhile, the novel circuit is also much shorter than the normal circuit with good performance at the working frequencies. It, therefore, will favor the miniaturized design of a high-power millimeter-wave TWT.</P>

Freedom of Expression

Mingliang Li 한국콘텐츠학회 2013 ICCC International Digital Design Invitation Exhib Vol.2013 No.-

Current Research on Subchondral Insufficiency Fracture of the Femoral Head

Mingliang Chen,Xipeng Wang,Eiji Takahashi,Ayumi Kaneuji,You Zhou,Kawahara Norio 대한정형외과학회 2022 Clinics in Orthopedic Surgery Vol.14 No.4

Subchondral insufficiency fracture (SIF) of the femoral head is one of the predominant etiologies of rapidly progressive osteoarthritis of the hip (RPOH). SIF is a rare disease that causes acute pain in the hip joint. It is most frequently found in elderly women with osteoporosis. It is often underdiagnosed or misdiagnosed as osteonecrosis of the femoral head. SIF is currently a well-established cause of RPOH; however, the deeper etiology of SIF is not clear. Good clinical outcomes have been reported for hip preservation therapy and hip replacement. SIF is not obvious radiologically in the early stage, and a T1-weighted magnetic resonance imaging shows a discontinuous low-intensity band under the articular cartilage convex to the articular surface as its characteristic manifestation. Some patients will lose the opportunity to preserve the hip joint due to symptoms such as progressive joint space narrowing and subchondral collapse within a very short period. Patients with progressive hip space narrowing and subchondral collapse on Xray should be converted to total hip arthroplasty. Based on the characteristics of the disease, surgeons need to master the clinical and radiological characteristics of SIF and strive for early diagnosis and treatment.

Molecular Markers Linked to Specific Characteristics of Prunus persica (L.) Batsch

Mingliang Yu,Ruijuan Ma,Zhijun Shen,Zhen Zhang 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

A Social Network Analysis of Ski Research Topics in China

( Mingliang Zhang ),( Weiqi Chai ),( Wangda Guo ),( Bin Li ) 아시아스포츠융합과학회 2020 Asia Pacific Journal of Applied Sport Sciences Vol.1 No.3

PURPOSE The purposes of this paper were to: (1) study the development process of skiing knowledge network and to understand the research focus and development trend of skiing in different periods, and (2) to analyze the sub areas of ski cohesion research. METHOD Using CiteSpace visualization software of bibliometrics, a social network analysis was conducted on a total of 325 papers on 14 sports professional core journals in China Knowledge Network (CNKI) from 1990 to 2019. RESULT The research results showed that the amount of articles on skiing topics has been increased rapidly and the ski research themes change over time. In last 10 years, the main focuses of the research were Winter Olympics, ski tourism, ski industry, freestyle skiing aerials and competitive sports. The Winter Olympics, ice and snow sports and ski industry are the current and future hot research topics and frontiers. The knowledge structure consists of eight theme fields, including Winter Olympics, ski resorts, ice and snow sports, ice and snow industry, ski tourism, sports management, freestyle skiing aerials and snowboarding u-track skiing. CONCLUSION First of all, in the past 30 years, keywords in the field of ski research have undergone great changes. The Winter Olympics and ski industry topics are the current and future key research trends. In-depth research on these two topics will be an important challenge for scholars. Secondly, keyword network analysis provides new ideas and research methods for exploring the structure and development trend of the skiing field.