检索结果-南通市图书馆

Molecular Plant 2011年第1期4卷 116-126页

作者： Xiao-Dong Sun min ni Department of Plant Biology University of Minnesota St Paul MN 55108 USA

Ambient light has profound effects on early seedling de-etiolation through red and far-red light-absorbing phytochromes and blue and UV-A light-absorbing cryptochromes. Subsequent integration of various light signal trans- duction pathways leads to changes in gene expression and morphogenic responses. Here, we report the isolation of a new Arabidopsis light-signaling component, HYPOSENSITIVE TO LIGHT or HTL. Both htl-1 and htl-2 alleles displayed a long hypocotyl phenotype under red, far-red, and blue light, whereas overexpression of HTL caused a short hypocotyl pheno- type under similar light conditions. The mutants also showed other photomorphogenic defects such as elongated petioles, retarded cotyledon and leaf expansion, reduced accumulation of chlorophyll and anthocyanin pigments, and attenuated expression of light-responsive CHLOROPHYLL A/B BINDING PROTEIN 3 and CHALCONE SYNTHASE genes. HTL belongs to an alpha/beta fold protein family and is localized strongly in the nucleus and weakly in the cytosol. The expression of HTL was strongly induced by light of various wavelengths and this light induction was impaired in elongated hypocotyl 5. HY5 directly bound to both a C/G-box and a G-box in the HTL promoter but with a greater affinity toward the C/G-box. HTL, therefore, represents a new signaling step downstream of HY5 in phy- and cry-mediated de-etiolation responses.

关键词： HTL de-etiolation alpha/beta fold protein HY5.

Markov Jump Processes in Estimating Sharing of Identity by Descent

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 Mathematicae Applicatae Sinica 2021年第1期37卷 183-191页

作者： Xian CHEN Wei GUO Xu-min ni School of Mathematical Sciences Xiamen UniversityXiamen 361005China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China Department of Mathematics Beijing Jiaotong UniversityBeijing 100044China

Identity by descent(IBD)sharing is a very important genomic feature in population genetics which can be used to reconstruct recent demographic *** this paper we provide a framework to estimate IBD sharing for a demographic model called two-population model with *** adopt the structured coalescent theory and use a continuous-time Markov jump process{X(t),t≥0}to describe the genealogical process in such *** we apply Kolmogorov backward equation to calculate the distribution of coalescence time and develop a formula for estimating the IBD *** simulation studies show that our method to estimate IBD sharing for this demographic model is robust and accurate.

关键词： IBD sharing structured coalescent theory Markov jump process Kolmogorov backward equation

维普期刊数据库

Timing of Photoperiodic Flowering：Light Perception and Circadian Clock

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2007年第1期49卷 28-34页

作者： Yun Zhou Xiao-Dong Sun min ni Department of Plant Biology University of Minnesota St. Paul MN 55108 USA

Flowering symbolizes the transition of s plant from vegetative phase to reproductive phase and is controlled by fairly complex and highly coordinated regulatory pathways. Over the last decade, genetic studies in Arabidopsis have aided the discovery of many signaling components involved in these pathways. In this review, we discuss how the timing of flowering is regulated by photoperiod and the involvement of light perception and the circadian clock in this process. The specific regulatory mechanisms on CONSTANS expression and CONSTANS stability by the circadian clock and photoreceptors are described in detail. In addition, the roles of CONSTANS, FLOWERING LOCUS T, and several other light signaling and circadian-dependent components in photoperiodic flowering are also highlighted.

关键词： circadian clock CONSTANS light signaling photoperiodic flowering photoreceptors

Two MADS-box proteins,AGL9 and AGL15,recruit the FIS-PRC2 complex to trigger the phase transition from endosperm proliferation to embryo development in Arabidopsis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2024年第7期17卷 1110-1128页

作者： Shen Zhang Devasantosh Mohanty Adnan Muzaffar min ni Department of Plant and Microbial Biology University of Minnesota at Twin CitiesSaint PaulMinnesota MN 55108United States of AmericaUSA

Spatiotemporal regulation of gene expression by polycomb repressive complex 2(PRc2)is critical for animal and plant *** Arabidopsis fertilization independent seed(FIS)-PRC2 complex functions specifically during plant reproduction from gametogenesis to seed *** a double fertilization event,triploid endosperm proliferates early,followed by the growth of a diploid embryo,which replaces the endosperm in Arabidopsis and many *** genes critical for endosperm proliferation such as IKkU2 and minI3 are activated after *** we report that two MADS-box AGAMOUS-LIKE(AGL)proteins associate with the key endosperm proliferation loci and recruit the FIS-PRC2 repressive complex at 4-5 days after pollination(DAP).Interestingly,AGL9 and AGL15 only accumulate toward the end of endosperm proliferation at 4-5 DAP and promote the deposition of H3K27me3 marks at key endosperm proliferation *** of AGL9 and AGL15 or overexpression of AGL9 or AGL15 significantly influence endosperm proliferation and ***-wide analysis with cleavage Under Targets and tagmentation(CUT&Tag)sequencing and RNA sequencing revealed the landscape of endosperm H3K27me3 marks and gene expression profiles in Col-0 and agl9 ***&Tag qPCR also demonstrated the occupancy of the two MADS-box proteins and FIS-PRC2 on a few representative target *** studies suggest that MADS-box proteins could potentially recruit PRc2 to regulate many other developmental processes in plants or even in fungi and animals.

关键词： AGL9 AGL15 embryo endosperm IKU2 MEDEA minI3

WRKY2 and WRKY10 regulate the circadian expression of PIF4 during the day through interactions with CCA1/LHY and phyB

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Communications 2022年第2期3卷 121-137页

作者： Shulei Wang Qingbin Sun min Zhang Chengzhu Yin min ni National Key Laboratory of Crop Biology College of Life SciencesShandong Agricultural UniversityTaian 271018China Department of Plant and Microbial Biology University of Minnesota at Twin CitiesSaint PaulMN 55108USA

WRKY transcription factors are known mostly for their function in plant defense,abiotic stress responses,senescence,seed germination,and development of the pollen,embryo,and ***,we report the regulatory functions of two WRKY proteins in photomorphogenesis and PIF4 ***4 is a critical signaling hub in light,temperature,and hormonal signaling *** its expression or its accumulation peaks in the morning and ***2 and WRKY10 form heterodimers and recognize their target site in the PIF4 promoter near the MYB element that is bound by CCA1 and LHY under red and blue ***2 and WRKY10 interact directly with CCA1/LHY to enhance their targeting but interact indirectly with *** two WRKY proteins also interact with phyB,and their interaction enhances the targeting of CCA1 and LHY to the PIF4 ***1 associates with theWRKY2 andWRKY10 loci and enhances their expression in parallel with the PIF4 expression *** forward regulatory loop further sustains the accumulation of the two WRKY proteins and the targeting of CCA1/LHY to the PIF4 *** summary,interactions of two WRKY proteins with CCA1/LHY and phyB maintain an optimal expression level of PIF4 toward noon and afternoon,which is essential to sketch the circadian pattern of PIF4 expression.

关键词： CCA1 LHY light signaling PIF4 expression WRKY2 WRKY10

A new strategy for obtaining highly concentrated phosphorus recovery solution in biofilm phosphorus recovery process

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 Environmental Sciences 2022年第2期34卷 366-375页

作者： Wanjing Yang Jie Shan Yang Pan Zhen Bi Yong Huang Hao Zhang min ni School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China National&Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology Suzhou University of Science and TechnologySuzhou 215009China

Recovery of phosphorus(P)from wastewater is of great significance for alleviating the shortage of P *** present,the P recovery process is faced with the problem of excessive organic carbon consumption when obtaining a P-concentrated recovery *** study proposed a new strategy to obtain a more highly concentrated P recovery solution with minimal carbon consumption by strengthening the P storage capacity of the biofilm.A biofilm sequencing batch reactor(BSBR)process was modified to treat synthetic *** effect of the dissolved oxygen(DO)concentration on the P storage capacity of the biofilm was investigated at DO concentrations of DO 3.5 mg/L(P_(L))and DO 6.5 mg/L(P_(H)).The results showed a maximum P storage of 101.2 and 149.6 mg-P/g-mixed liquid suspended solids under the two *** the P storage capacity of the biofilm resulted in a net increase in the P recovery rate,which was as high as 66.96%in a harvesting cycle,and total soluble P>220 mg/L in the P recovery solution was successfully ***,the carbon cost of P recovery in the BSBR was reduced to 41.57 g-chemical oxygen demand/gP,and the carbon utilization efficiency was *** highlight the new strategy,the P recovery performance of the BSBR was given and the relationship between P content and anaerobic P release was *** addition,the changes in the microbial communities under P_(L) and P_(H) conditions were analyzed.

关键词： Biofilm sequencing batch reactor Phosphorus storage capacity Phosphorus release Phosphorus recovery

维普期刊数据库

Liver-adipose tissue crosstalk in alcohol-associated liver disease: The role of mTOR

在线全文

学校读者我要写书评

暂无评论

Liver Research 2022年第4期6卷 227-237页

作者： Yssa Rodriguez Jack Dunfield Tyson Roderique Hong-min ni Department of Pharmacology Toxicology and TherapeuticsUniversity of Kansas Medical CenterKansas CityKSUSA

Background:Alcohol-associated liver disease(ALD)is a major chronic liver disease around the world without successful *** alcoholic hepatitis is one of the most severe forms of ALD with high mortality,which is often associated with binge *** drinking dysregulates lipid metabolism,increases adipose tissue lipolysis,and induces liver steatosis and adipose tissue *** ev-idence implicates that crosstalk of liver and adipose tissue in the pathogenesis of *** target of rapamycin(mTOR)is a phosphatidylinositol 3-kinase(PI3K)-like serine/threonine protein kinase that regulates lipid metabolism,cell proliferation and ***,the role of mTOR in regulating adipose-liver crosstalk in binge drinking-induced organ damage remains ***:We generated liver-specific and adipocyte-specific regulatory-associated protein of mTOR(Rptor)knockout(Rptor LKO and Rptor AKO)as well as Mtor knockout(Mtor LKO and Mtor AKO)mice,by crossing Rptor flox and Mtor flox mice with albumin Cre or adiponectin Cre mice,*** addition,we generated liver and adipocyte double deletion of Rptor or Mtor(Mtor LAKO and Rptor LAKO)*** knockout mice with their matched wild-type littermates(Rptor WT and Mtor WT)were subjected to acute gavage of 7 g/kg ***:Mice with adipocyte deletion of Rptor or Mtor developed hepatomegaly and adipose tissue *** gavage increased liver injury,hepatic steatosis and inflammation in mouse livers as demonstrated by elevated serum alanine aminotransferase activities,increased hepatic levels of tri-glyceride and increased hepatic numbers of CD68 positive macrophages in mouse livers after alcohol *** injury was further exacerbated by deletion of adipocyte Rptor or *** adipokine array analysis revealed that increased levels of pro-inflammatory cytokines IL-6 and TNF a as well as chemokine MCP-1 following acute alcohol gavage in wild-type mice,which were further incr

关键词： Alcohol-associated liver disease(ALD) Liver injury Mechanistic target of rapamycin(mTOR) Adipose atrophy Adipokine Liver-adipose tissue crosstalk

Integration of light signaling with photoperiodic flowering and circadian rhythm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cell Research 2005年第8期15卷 559-566页

作者： min ni* Department of Plant Biology, University of minnesota, St. Paul, MN 55108, USA Department of Plant Biology University of Minnesota St. Paul USA

Plants become photosynthetic through de-etiolation, a developmental process regulated by red/far-red light-absorbing phytochromes and blue/ultraviolet A light-absorbing cryptochromes. Genetic screens have identified in the last decade many far-red light signaling mutants and several red and blue light signaling mutants, suggesting the existence of distinct red, far-red, or blue light signaling pathways downstream of phytochromes and cryptochromes. However, genetic screens have also identified mutants with defective de-etiolation responses under multiple wavelengths. Thus, the opti- mal de-etiolation responses of a plant depend on coordination among the different light signaling pathways. This review intends to discuss several recently identified signaling components that have a potential role to integrate red, far-red, and blue light signalings. This review also highlights the recent discoveries on proteolytic degradation in the desensitization of light signal transmission, and the tight connection of light signaling with photoperiodic flowering and circadian rhythm. Studies on the controlling mechanisms of de-etiolation, photoperiodic flowering, and circadian rhythm have been the fascinating topics in Arabidopsis research. The knowledge obtained from Arabidopsis can be readily applied to food crops and ornamental species, and can be contributed to our general understanding of signal perception and transduction in all organisms.

关键词： circadian regulation cryptochromes photomorphogenesis photoperiodic flowering phytochromes.

Study on the Relation Bet ween Magnetic Moment and Charge Transfer of Metallic Glasses By LCAO-X_(α) Method

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1996年第3期13卷 196-198页

作者： LIU Hong-lin CHEN nian-yi ni min HE Li-ming JIN Qian-yuan Shanghai Institute of Metallurgy Chinese Academy of SciencesShanghai 200050 Department of Physics East China University of Science and TechnologyShanghai 200237

The calculations of the clusters,T_(27) and T_(27)B_(7)(T=Fe,Co and ni),modelling metallic glasses have been performed using the quantum chemical linear combination of atomic orbitals(LCAO)-X_(α) *** argument about t... 详细信息

关键词： (α) glasses clarified

Environmental factors regulating cyanobacteria dominance and microcystin production in a subtropical lake within the Taihu watershed,China

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 Zhejiang University-Science A(Applied Physics & Engineering) 2012年第4期13卷 311-322页

作者： Wan-min ni Jian-ying ZHANG Teng-da DING R.Jan STEVENSON Yin-mei ZHU Institute of Environmental Science Zhejiang University Hangzhou 310058China Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control Hangzhou 310058China Center for Water Sciences Michigan State UniversityEast LansingM148824.USA

Understanding the pattern ofphytoplankton and their dependence on water quality variables, can help the management of eutrophic lakes. The aim of this study was to determine water quality and environmental factors associated with cyanobacteria dominance and microcystin production in Qingshan Lake, a subtropical lake located in the headwater of the Taihu watershed, China. Water samples collected monthly from 10 study sites in Qingshan Lake were analyzed for the species distributions of freshwater algae and physico-chemical parameters including total nitrogen （TN）, ammonia （NH4＋-N）, nitrate （NO3--N）, total phosphorus （TP）, and chlorophyll a （Chl-a） from June, 2008 to May, 2009. Qingshan Lake was found to be eutrophic, based on the calculated trophic state index （TSI）. The average TN of 4.33 mg/L during the study period exceeded the Surface Water Quality Standards of China. TP was significantly correlated with relative abundance of cyanobacteria and Microeystis biovolume, indi- cating its important role in regulating cyanobacteria. Microcystis, Anabaena, and Oscillatoria were dominant cyanobacteria in Qingshan Lake from June to November, 2008. Cyanobacteria dominance was regulated by water temperature and TE Principal component analysis further indicated that microcystin production was most affected by water temperature, TP, and cyanobacteria biomass. Results suggest that the control of TP in summer can mitigate cyanobacteria dominance and microcystin production in Qingshan Lake, and close monitoring should be undertaken in summer.

关键词： cyanobacteria Microcystins Eutrophication Water quality Taihu watershed

维普期刊数据库