检索结果-南通市图书馆

circRNA3669 promotes goat endometrial epithelial cells proliferation via miR-26a/RCN2 to activate PI3K/AKT-mTOR and mAPK pathways

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第3期23卷 960-974页

作者： Xiaorui Liu Jiuzeng Cui mengyao Wei Xiaofei Wang Yuexia Liu Zhongshi Zhu min Zhou Gui ba Langda Suo Yuxuan Song Lei Zhang Division of Laboratory Safety and Services Northwest A&F UniversityYangling 712100China College of Animal Science and Technology Northwest A&F UniversityYangling 712100China Institute of Animal Sciences Tibet Academy of Agricultural and Animal Husbandry SciencesLhasa 850009China

The development of receptive endometrium(RE) from pre-receptive endometrium(PE) for successful embryo implantation is a complex dynamic process in which the morphology and physiological states of the endometrial epithelium undergo a series of significant changes, including cell proliferation and apoptosis. However, the molecular mechanisms are not yet fully understood. In this study, a higher circRNA3669 level was observed in PE than in RE of goats. Functional assays revealed that this overexpression promoted the proliferation of goat endometrial epithelial cells(GEECs) by activating the expression of genes related to the PI3K/AKT-mTOR and mAPK pathways,thereby inhibiting apoptosis in vitro. Furthermore, circRNA3669 functioned as a competing endogenous RNA(ceRNA) to upregulate Reticulocalbin-2(RCN2) expression at the post-transcriptional level by interacting with and downregulating miR-26a in GEECs. In addition, RCN2, which is highly expressed in the PE of goats, was found to be regulated by β-estradiol(E2) and progesterone(P4). Our results demonstrated that RCN2 also affected the key proteins PI3K, AKT, mTOR, JNK, and P38 in the PI3K/AKT-mTOR and mAPK pathways, thereby facilitating GEECs proliferation and suppressing their apoptosis in vitro. Collectively, we constructed a new circRNA3669-miR-26aRCN2 regulatory network in GEECs, which further provides strong evidence that circRNA could potentially play a crucial regulatory role in the development of RE in goats.

关键词： circRNA3669 RCN2 miR-26a goat endometrial epithelial cells(GEECs) proliferation

Spatiotemporal distribution of protists in the Yarlung Zangbo River,Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

Water Biology and Security 2022年第4期1卷 77-86页

作者： Peng Zhang Jie Xiong Nanqian Qiao Ruizhi An Zhen Da Wei miao Sang ba Laboratory of Wetland and Catchments Ecology in Tibetan Plateau Faculty of Natural SciencesTibet UniversityLhasa850000China Key Laboratory of Aquatic Biodiversity and Conservation Institute of HydrobiologyChinese Academy of SciencesWuhan430072China

Protists,which include eukaryotic algae and protozoa,are crucially important for biogeochemical cycling and the aquatic food web but are sensitive to environmental *** investigations in the 1970s,protist diversity and biogeographic characteristics in the Tibetan Plateau are poorly *** the framework of a regional survey of protist diversity,we used high-throughput amplicon sequencing to investigate the composition and spatiotemporal turnover of protist communities along the Yarlung Zangbo River,a representative aquatic habitat of the Tibetan *** total,we detected 9,959 amplicon sequence variants in protist communities along the river and associated lakes and *** alpha diversity of protists was highest in spring and declined in the ***,alpha diversity was much higher in the middle and upstream reaches and tributaries than in the connected lakes and *** discovered spatiotemporal heterogeneity in the composition of protist communities across the *** predominated in protist communities in cold seasons(spring and autumn)and colder(high-altitude)areas,whereas Ciliophora and Cercozoa species predominated in the warm season(summer)and warmer(low-altitude)*** the environmental factors,altitude,turbidity and salinity correlated with spatiotemporal dissimilarities among protist *** breadth of the habitat niche was restricted by turbidity and altitude in river areas and by salinity in lake and wetland ***-occurrence network analysis suggested that protist communities in the Yarlung Zangbo River were substantially more complex in the warm season than in the cold seasons,and that amplicon sequence variants belonging to Ochrophyta,Chlorophyta,and Ciliophora contributed greatly to the stability of the cooccurrence *** summary,this study provides a comprehensive overview of the spatiotemporal dynamics of protist diversity in the Yarlung Zangbo River and improves our und

关键词： Yarlung Zangbo river Protist Diversity Spatiotemporal distribution 18S rDNA amplicon

Border effects of the main and ratoon crops in the rice ratooning system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2023年第1期22卷 80-91页

作者： ZHENG Chang WANG Yue-chao XU Wen-ba YANG De-sheng YANG Guo-dong YANG Chen HUANG Jian-liang PENG Shao-bing National Key Laboratory of Crop Genetic Improvement/Hubei Hongshan Laboratory/mARA Key Laboratory of Crop Ecophysiology and Farming Systems in the middle Reaches of the Yangtze River/College of Plant Science and Technology Huazhong Agricultural UniversityWuhan 430070P.R.China

The border effect(BE)is widely observed in crop field experiments,and it has been extensively studied in many ***,only limited attention has been paid to the BE of ratoon *** conducted field experiments on ratoon rice in Qichun County,Hubei Province,Central China in 2018 and 2019 to compare the BE in the main and ratoon crops,and to quantify the contribution of BE in the main crop to that in the ratoon *** BE of two hybrid varieties was measured for the outermost,second outermost,and third outermost rows in each plot of both *** determine the contribution of BE between the two crops,portions of hills in the outermost and second outermost rows were uprooted during the harvest of the main crop so that the second and third outermost rows then became the outermost rows in the ratoon ***,the BE on grain yield was greater in the main crop than in the ratoon *** the main crop,the BE on grain yield was 98.3%in the outermost row,which was explained by the BE on panicles m^(–2),spikelets/panicle,spikelets m^(–2),and total dry *** the ratoon crop,the BE on grain yield was reduced to 60.9 and 27.6%with and without the contribution of the BE in the main crop,***,55.1%of the BE on grain yield in the ratoon crop was contributed from the main *** stubble dry weight and non-structural carbohydrate(NSC)accumulation at the harvest of the main crop were responsible for the contribution of BE in the main crop to that in the ratoon *** results suggest that increases in stubble dry weight and NSC accumulation at the harvest of the main crop could be important strategies for developing high-yielding cropping practices in the rice ratooning system.

关键词： border effect grain yield non-structural carbohydrate ratoon rice

Study of a Toposequence of West mayo-Kani Soils (Far North Cameroon)

在线全文

学校读者我要写书评

暂无评论

Open Journal of Soil Science 2022年第10期12卷 523-539页

作者： Souoré Irène basga Simon Doumnang mbaigane Jean-Claude Ngaro m’baïti management of Water Resources Soils and Environment Department of Earth Sciences Faculty of Sciences University of Ngaoundéré Ngaoundéré Cameroon Institute of Agronomic Research for Development (IRAD) of Garoua Garoua Cameroon Laboratory of Geology Geomorphology and Remote Sensing University of N’Djamena N’Djamena Chad

The soils of Gadas, object of the present study, are identified on the macromorphological, physico-chemical level and the indices of erodibility are related to their physico-chemical properties. The physico-chemical analyzes were carried out by standard methods. The macromorphological analysis of a toposequence made it possible to identify five types of soils: the lithosols which occupy the high zones of the landscape, the colluvial soils (arenosols, regosols) which are located high on the piedmont, alluvial soils (fluvisols) which are located at the bottom of the slope in the alluvial plain and are the most extensive, topomorphic vertisols, and brown soils formed on granite are located either between a colluvial soil and alluvial soil. Physico-chemical analyzes of the soils of Gadas show that these soils are weakly acidic to neutral, sandy to sandy-clayey, saturated, low in nitrogen and organic matter and characterized by average proportions of exchangeable bases. The study of soil erodibility, based on the use of erodibility indices, showed that alluvial soils and brown soils formed on granites are the most susceptible to erosion, whereas vertisols and colluvial soils are the least vulnerable to erosion.

关键词： Far North Cameroon West mayo-Kani Gadas Soils Erodibility

Chryseobacterium/Elizabethkingia species infections in children

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical medicine 2023年第6期16卷 268-275页

作者： Aysun Yahşi Gülsümİclal bayhan Tuğba Erat Ahmet Yasin Güney Seval Özen Kübra Konca Belgin Gülhan Saliha Kanık Yüksek Aslınur Özkaya Parlakay Department of Pediatric Infectious Diseases Ankara City HospitalAnkaraTurkey

Objective:To investigate the clinical and epidemiological features and outcome of Chryseobacterium and Elizabethkingia *** in children,together with antimicrobial ***:This retrospective study was conducted at a tertiary pediatric hospital in *** patients infected with Chryseobacterium/Elizabethkingia *** those presenting to Ankara City Hospital between march 2014 and march 2022 were ***:A total of 49 cases were included and 29 cases were identified as *** median age was 14(0.2-185.0)*** majority(89.8%)of these patients had an underlying disease,including malignancy(42.9%).bacteremia(46.9%)and central line-associated bloodstream infection(28.6%)were the most common *** thirty-day all-cause mortality rate was 12.2%.The most commonly used antibiotics were ciprofloxacin and trimethoprim-sulfamethoxazole(TmP-SmX).Forty-five(91.8%)isolates were susceptible to ciprofloxacin,44(91.6%)to TmP-SmX,and 21(87.5%)to ***:Chryseobacterium and Elizabethkingia *** emergent,nosocomial pathogens and the majority of cases were older than the neonatal *** were mainly seen in patients with long hospital stays,indwelling devices,and those who have received antibiotics within the last month,especially *** addition,they were associated with bloodstream infection and *** most commonly useful antibiotics according to the resistance patterns were ciprofloxacin and TmP-SmX.

关键词： Chryseobacterium Elizabethkingia Flavobacteriaceae Weeksellaceae

Charaeterizability of the Group ~2D_p(3) by its Order Components,Where p≥5 is a Prime Number Not of the Form 2~m+1

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta mathematica Sinica,English Series 2008年第7期24卷 1117-1126页

作者： m.R.DARAFSHEH School of mathematics College of ScienceUniversity of TehranTehranIran

The author will prove that the group ^2Dp（3） can be uniquely determined by its order components, where p ≠ 2^m ＋ 1 is a prime number, p ≥ 5. more precisely, if OC（G） denotes the set of order components of G, we will prove OC（G） = OC（^2Dp（3）） if and only if G is isomorphic to ^2Dp（3）. A main consequence of our result is the validity of Thompson＇s conjecture for the groups under consideration.

关键词： prime graph order component linear group

黏声波方程波场模拟的通用格式自适应系数频域有限差分方法

在线全文

学校读者我要写书评

暂无评论

地球物理学报 2024年第2期67卷 654-669页

作者：徐文豪巴晶 J.m.Carcione 朱鹤松河海大学地球科学与工程学院南京211100 National Institute of Oceanography and Applied Geophysics-OGS Borgo Grotta Gigante 42/cTriesteSgonico 34010Italy

黏声波方程常被用于描述地下介质的黏弹性及波的传播现象,频域有限差分(finite difference frequency domain,FDFD)方法是黏声波和黏弹性波波场模拟的常用工具.目前FDFD黏声波模拟常用的二阶五点方法和优化九点方法在一个波长内的网格... 详细信息

黏声波方程常被用于描述地下介质的黏弹性及波的传播现象,频域有限差分(finite difference frequency domain,FDFD)方法是黏声波和黏弹性波波场模拟的常用工具.目前FDFD黏声波模拟常用的二阶五点方法和优化九点方法在一个波长内的网格点数小于4时误差较大.通过令FDFD系数随一个波长内的网格点数自适应从而提高FDFD方法的精度,本文针对黏声波波场模拟发展了一种适用于不同空间采样间隔之比的通用格式自适应系数FDFD方法.同时,为了验证自适应系数FDFD方法对一般黏声波模型的有效性,本文针对三个典型的黏声波模型,分别采用解析解和基于高阶FDFD的参考解验证了所提出方法的有效性.本方法的FDFD格式通过在传统的二阶FDFD格式的基础上引入相关校正项得到,其中校正项按网格点与中心点的距离进行分类选取,同时校正项对应的自适应FDFD系数不仅和空间采样间隔之比相关,还和一个波长内的采样点数相关.所需的自适应FDFD系数可通过声波方程的数值频散关系和查找表高效给出.数值频散分析表明,在空间采样间隔相等或不等的情况下,以相速度误差不超过1%为标准,通用格式自适应系数FDFD方法所需的一个波长内的采样点数均小于2.5.数值模拟实验表明,对于不同的空间采样间隔之比,相对于常用的二阶五点FDFD方法和优化九点FDFD方法,通用格式自适应系数FDFD方法均可在相似的计算量和内存需求下,有效提高黏声波模拟的精度.

关键词：黏声波频域有限差分自适应系数波场模拟通用格式

Antimonene-based saturable absorber for a soliton mode-locked and Q-switched fiber laser in the 2 μm wavelength region

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2023年第6期32卷 259-269页

作者： H Ahmad B Nizamani m Z Samion N Yusoff m F Ismail Photonics Research Centre Universiti Malaya50603 Kuala LumpurMalaysia Physics Department Faculty of ScienceUniversiti Malaya50603 Kuala LumpurMalaysia Distinguished Visiting Professor Universiti Kuala Lumpur British Malaysian Institute(UniKL BMI)Batu 8Jln Sungai Pusu53100SelangorMalaysia

We demonstrate antimonene as a saturable absorber(SA) to generate an ultrafast mode-locked and Q-switched laser in the 2 μm wavelength region. The two antimonene-based SAs were prepared and inserted separately in a thulium–holmiumdoped fiber laser to produce the pulsed laser. Antimonene was coated onto a tapered fiber to generate soliton mode-locked pulses and used in thin-film form for the generation of Q-switched pulses. The mode-locking was stable within a pump power of 267 m W–511 m W, and the laser operated at a central wavelength of 1897.4 nm. The mode-locked laser had a pulse width of 1.3 ps and a repetition rate of 12.6 mHz, with a signal-to-noise ratio of 64 d B. Q-switched laser operation was stable at a wavelength of 1890.1 nm within a pump power of 312 m W–381 m W. With the increase in pump power from 312 m W to 381 m W, the repetition rate increased to a maximum of 56.63 k Hz and the pulse width decreased to a minimum value of 2.85 μs. Wide-range tunability of the Q-switched laser was also realized within the wavelength range of1882 nm–1936 nm.

关键词： mode-locking Q-switched fiber laser optical saturable absorber

Non-destructive and distributed measurement of optical fiber diameter with nanometer resolution based on coherent forward stimulated Brillouin scattering

在线全文

学校读者我要写书评

暂无评论

Light(Advanced manufacturing) 2021年第4期2卷 1-12页

作者： Zijie Hua Dexin ba Dengwang Zhou Yijia Li Yue Wang Xiaoyi bao Yongkang Dong National Key Laboratory of Science and Technology on Tunable Laser Harbin Institute of Technology150001 HarbinChina Postdoctoral Research Station for Optical Engineering School of AstronauticsHarbin Institute of TechnologyHarbin 150001China Research Center for Space Optical Engineering School of AstronauticsHarbin Institute of TechnologyHarbin 150001China Fiber Optics Group Department of PhysicsUniversity of OttawaOttawaK1N 6N5Canada

Precise control and measurement of the optical fiber diameter are vital for a range of fields,such as ultra-high sensitivity sensing and high-speed optical ***,the measurement of fiber diameter relies on point measurement schemes such as microscopes,which suffer from a tradeoff between the resolution and field of *** the fiber can irreversibly damage the fiber samples,especially when multi-point measurements are *** overcome these problems,we have explored a novel technique in which the mechanical properties of fibers are reflected by forward stimulated Brillouin scattering(FSBS),from which the diameters can be demodulated via the acoustic dispersion *** distributed FSBS spectra with narrow linewidths were recorded via the optimized optomechanical time-domain analysis system using coherent FSBS,thereby achieving a spatial resolution of 1 m over a fiber length of tens of *** successfully obtained the diameter distribution of unjacketed test fibers with diameters of 125μm and 80μ*** diameter accuracy was verified by high-quality scanning electron microscope *** achieved a diameter resolution of 3.9 nm,virtually independent of the diameter *** the best of our knowledge,this is the first demonstration of non-destructive and distributed fiber diameter monitoring with nanometer resolution.

关键词： fiber scattering resolution