Stochasticity dominates assembly processes of soil nematode metacommunities on three Asian mountains     

Shuqi ZOU  Jonathan ADAMS  Zhi YU  Nan LI  Dorsaf KERFAHI  Binu TRIPATHI  Changbae LEE  Teng YANG  Itumeleng MOROENYANE  Xing CHEN  Jinsoo KIM  Hyun Jeong KWAK  Matthew Chidozie OGWU  Sang-Seob LEE  Ke DONG 《土壤圈》2023,33(2):331-342

Nematodes play an important role in ecosystems; however, very little is known about their assembly processes and the factors influencing them. We studied nematode communities in bulk soils from three Asian mountain ecosystems to determine the assembly processes of free-living nematode metacommunities and their driving factors. On each mountain, elevations span a range of climatic conditions with the potential to reveal assembly processes that predominate across multiple biomes. A phylogenetic nu...  相似文献   

Numerical study on two-phase flow in horizontal pipe     

WU Yuting  XU Kewei  KIM Hyoungbum 《排灌机械工程学报》2021,39(4):379-385

Two-phase flow in a horizontal pipe was investigated by using numerical and experimental visualization methods.A horizontal pipe was built for qualitative and quantitative flow visualization.The length of horizontal pipe flow system was 9.5 m and the inner diameter was 51 mm.High-speed video method was used for the qualitative visualization and PIV method was applied for the quantitative visua-lization.The same geometry model was used for the numerical study.Three flow regimes including stratified flow,elongated bubble and slug flow field were generated and visualized by using numerical and experimental methods.The results show that the numerical simulation results are qualitatively si-milar to that of the experimental results.In addition,more quantitative results can be analyzed by numerical method.Development and decay process of slug flow was investigated,showing that the decay of slug heavily depends on the magnitude of nose velocity and its lasting time.It can also be found that the liquid superficial velocity plays a significant role in affecting the slug frequency.When keeping the gas superficial velocity constant,the frequency will increase with the liquid superficial velocity.  相似文献   

不同生长环境下水稻结实率数量性状位点的检测   总被引：4，自引：0，他引：4  

韩龙植  张三元  乔永利  金钟焕  徐福荣  曹桂兰  南钟浩  戴陆园  芮钟斗  高熙宗 《作物学报》2006,32(7):1024-1030

以籼稻密阳23与粳稻吉冷1号配制所获得的F_2:3群体200个家系作为作图群体，在北京、昆明、三亚、公主岭和韩国春川等5个点进行水稻结实率的鉴定，并利用SSR标记对水稻结实率数量性状位点进行检测。结果表明，水稻结实率表型值及其在F₃家系群中的分布以及所检测到的QTL数目因生长环境不同而有较大差异，说明QTL与环境有明显的互作效应。水稻结实率在F₃家系群中呈接近正态或偏态的连续分布，是多个基因所控制的数量性状。共检测到与水稻结实率相关的QTL 14个，分布于第1、2、3、4、6、7、8、10和12染色体上，对表型变异的贡献率为4.9%～15.3%。分别位于第1、2、6和12染色体RM1~RM259、RM263~RM6、RM340~RM30、RM270~RM17区间的qSSR1、qSSR2、qSSR6和qSSR12至少在2种生长环境下均检测到，对表型变异的贡献率分别为4.9%～8.4%、4.8%～7.2%、7.6%～10.7%和7.4%～10.4%。以上多数QTL增效等位基因均来自吉冷1号，基因作用方式主要为部分显性或显性或超显性。  相似文献   

氟啶胺对白菜根肿病的防治效果   总被引：2，自引：0，他引：2  

张铉哲  解明静  金炳燮  宋丽 《东北农业大学学报》2013,(1):77-80

白菜根肿病是威胁大白菜生产的一种土传性病害。为了筛选对白菜根肿病有效的杀菌剂,在室内和田间利用灌根方法测定氟啶胺对白菜根肿病的防治效果。室内药效测定结果显示氟啶胺乳油(有效质量浓度2.5和5μL·mL-1)的防治效果分别为89.9%和89.5%,均高于甲基硫菌灵的防治效果88%。氟啶胺乳油(有效质量浓度5和2.5μL·mL-1)的田间防治效果分别为77.6%和69.4%,均高于甲基硫菌灵的防治效果37.4%。结果表明,氟啶胺乳油可以用来防治白菜根肿病。  相似文献   

Effect of immersion in saturated salt solution on physicochemical properties of black rockfish muscle     

Young Je  CHO  Tae Jin  KIM  Kil Bo  SHIM  Gi Bong  LEE 《Fisheries Science》2003,69(5):1048-1052

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A Case of Gastric Adenocarcinoma in a Shih Tzu Dog: Successful Treatment of Early Gastric Cancer     

Hee-Chun LEE  Ji-Hyun KIM  Cho-Hee JEE  Jae-Hoon LEE  Jong-Hyun MOON  Na-Hyun KIM  Jung-Hyang SUR  Kyu-Woan CHO  Byeong-Teck KANG  Jeongim HA  Dong-In JUNG 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2014,76(7):1033-1038

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Global metabolomic analysis of blood from mice infected with Brucella abortus     

Son Hai VU  Bomin KIM  Alisha Wehdnesday Bernardo REYES  Tran Xuan Ngoc HUY  John Hwa LEE  Suk KIM  Hyun-Jin KIM 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2021,83(3):482

To better understanding Brucella abortus infection, serum metabolites of B. abortus-infected and -uninfected mice were analyzed and twenty-one metabolites were tentatively identified at 3 and 14 days post-infection (d.p.i.). Level of most lysophosphatidylcholines (LPCs) was found to increase in infected mice at 3 d.p.i., while it was decreased at 14 d.p.i. as compared to uninfected mice. In contrast, acylcarnitines were initially reduced at 3 d.p.i then elevated after two-weeks of infection, while hydroxysanthine was increased at 14 d.p.i. in infected mice. Our findings suggest that the significant changes in LPCs and other identified metabolites may serve as potential biomarkers in acute phase of B. abortus infection.  相似文献   

Factors affecting expression and transcription of uncoupling protein 2 gene     

Doo Hyun KIM  Hiroyuki SADAKANE  Yuka NISHIKIORI  Manami MATSUMURA  Mayuko IKEDA  Zhicheng DIAO  Rajesh JHA  Masaru MURAKAMI  Tohru MATSUI  Masayuki FUNABA 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2020,82(12):1734

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Effects of dietary protein and lipid level on growth and body composition of juvenile ayu (Plecoglossus altivelis) reared in seawater     

S.-M. LEE  D.-J. KIM  & S.H. CHO 《Aquaculture Nutrition》2002,8(1):53-58

A 3 (protein levels, 380, 460 and 520 g kg^–1 diet) × 2 (lipid levels, 65 and 140 g kg^–1 diet) factorial experiment with three replicates was conducted. Weight gain, feed efficiency and daily feed intake were not significantly affected by dietary protein level, but were by dietary lipid level. Weight gains of fish fed 65 g lipid kg^–1 diet were significantly, or slightly, higher than for 140 g lipid kg^–1 diet at all protein levels. Daily protein intake was significantly affected by both dietary protein and lipid levels ( P  < 0.002). Daily lipid intake was not significantly affected by dietary protein level, but was by dietary lipid level ( P  < 0.001). Protein efficiency ratio was significantly affected by dietary protein level ( P  < 0.02), but not by dietary lipid level. Protein efficiency ratio tended to improve with the decrease of dietary protein level at the same lipid level. Moisture, protein and lipid contents of whole fish were significantly affected by dietary lipid level ( P  < 0.01). Increased dietary lipid did not improve growth or feed efficiency, but increased body fat deposition. It was concluded that the optimum dietary protein and lipid level for growth of juvenile ayu may be 380 and 65 g kg^–1 diet, respectively, when fish were fed to satiety three times daily in seawater.  相似文献   

Rumen microbial response in production of CLA and methane to safflower oil in association with fish oil or/and fumarate     

Xiang Z. LI  Rui J. LONG  Chang G. YAN  Hong G. LEE  Young J. KIM  Man K. SONG 《Animal Science Journal》2011,82(3):441-450

Supplementation effect of fish oil and/or fumarate on production of conjugated linoleic acid (CLA) and methane by rumen microbes was examined when incubated with safflower oil. One hundred and twenty milligrams of safflower oil (SO), safflower oil with 24 mg fish oil (SOFO), safflower oil with 24 mmol/L fumarate (SOFA), or safflower oil with 24 mg fish oil and 24 mmol/L fumarate (SOFOFA) were added to the 90 mL culture solution. The culture solution was also made without any supplements (control). The SOFA and SOFOFA increased pH and propionate (C3) compared to other treatments from 3 h incubation time. An accumulated amount of total methane (CH₄) for 12 h incubation was decreased by all the supplements compared to control. The concentrations of c9,t11CLA for all the incubation times were increased in the treatments of SOFO, SOFA and SOFOFA compared to SO. The highest concentration of c9,t11CLA was observed from SOFOFA among all the treatments at all incubation times. Overall data indicate that supplementation of combined fumarate and/or fish oil when incubated with safflower oil could depress CH₄ generation and increase production of C₃ and CLA under the condition of current in vitro study.  相似文献