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Effects of Forest Gaps on Some Microclimate Variables in Castanopsis kawakamii Natural Forest

Journal of Mountain Science 2012年第5期9卷 706-714页

作者： HE Zhongsheng LIU Jinfu WU Caiting ZHENG Shiqun HONG Wei su Songjin WU Chengzhen College of Forestry Fujian Agriculture and Forestry UniversityFuzhou 350002China Key Laboratory of Fujian Universiaes for Ecology and Resource Statistics Fuzhou 35o002China

The objective of this study was to understand the effects of forest gap and variations in different seasons, gap size, locations and diurnal variations on forest microclimate and soil water content. Spatial and temporal distribution features oi air temperature （TA）, soil temperature （Ts）, relative humidity （h） and soil water content （ψ） were measured in Castanopsis kawakamii natural forest gaps created by a severe typhoon or fallen dead trees. The results showed that：（1） the variations of TA, h, and Tsin four seasons were extremely significant. The variations of ψ in four seasons were extremely significant except for those between spring and summer. （a） The diurnal variations of TA and Tswere expressed with a single peak curve. The diurnal variations of h and ψ presented a high-low-high trend （3） The variations of TA, h, and Ts were extremely significant among the large, medium and small gaps in C. kawakamii natural forest. Medium gaps had the highest TA and the lowest h while small gaps were jusl contrary to medium gaps. The variations of T were extremely significant for large, medium and small gaps except those between the medium and large gaps （4） The TA, h, Ts and ψ were decreased from the gap center, canopy gap, expanded gap to understory. These results will help further our understanding of the abiotic and consequent biotic responses to gaps in the mid-subtropical broadleaved forests, which also provide a theoretical basis for the scientific management and population restoration of C. kawakamii natural forest.

关键词： TA, air temperature Ts, soiltemperature h, relative humidity ψ, soil watercontent

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Uric formaldehyde levels are negatively correlated with cognitive abilities in healthy older adults

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Neuroscience Bulletin 2014年第2期30卷 172-184页

作者： Jing Yu Tao su Ting Zhou Yingge He Jing Lu Juan Li Rongqiao He Center on Ageing Psychology Key Laboratory of Mental Health Institute of Psychology Chinese Academy of Sciences Faculty of Psychology Southwest University State Key Laboratory of Brain and Cognitive Science Institute of Biophysics Chinese Academy of Sciences The University of Chinese Academy of Sciences

Recent studies have shown that the abnormal accumulation of endogenous formaldehyde could be a critical factor in age-related cognitive decline. The aim of this study was to estimate the correlation between uric formaldehyde and general cognitive abilities in a community-based elderly population, and to measure the extent and direction in which the correlation varied with demographic characteristics. Using a double-blind design, formaldehyde in human urine was analyzed by high-performance liquid chromatography （n = 604）, and general cognitive abilities were measured using the Montreal Cognitive Assessment （MoCA）. Demographic characteristics, in terms of age, gender, residential region, and education were taken into consideration. We found that uric formaldehyde levels were inversely correlated with the MoCA score, and the concentration varied with demographic features： higher odds of a high formaldehyde level occurred among the less educated and those living in old urban or rural areas. In cytological experiments, the level of cellular formaldehyde released into the medium increased as SH-SY5Y and BV2 cells were incubated for three days. Formaldehyde in excess impairedthe processes of N2a cells and neurites of primary cultured rat hippocampal cells. However, removal of formaldehyde markedly rescued and regenerated the processes of N2a cells. These results demonstrated a negative correlation between the endogenous formaldehyde and general cognitive abilities. High formaldehyde levels could be a risk factor for cognitive impairment in older adults, and could be developed as a non-invasive marker for detection and monitoring of age-related cognitive impairment.

关键词： uric formaldehyde the MontrealCognitive Assessment education learning livingregion

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Petrogenesis, geochemistry and geological significance of Paleocene Granite in South Gangdese, Tibet

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Acta Geochimica 2019年第6期38卷 883-896页

作者： Chengzhi Li Wenguang Yang Lidong Zhu Zhen Yang Limin Lin Xin su Hongliang Zhang School of Earth Sciences Chengdu University of TechnologyChengdu 610059China Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China No.282 Brigade Sichuan Bureau of Geology for Nuclear IndustryDeyang 618000SichuangChina

The Gangdese magmatic belt,located along the southern margin of the Lhasa terrane,plays a critical role in understanding the tectonic framework associated with the Indian-Asian slab *** this paper,a chronology of zircon U-Pb and geochemical analysis of the rock of the Cuobulaguo granitic mass in the southern of the Gangdese,Tibet,revealed a series of *** results show that the LA-ICP-MS monzonitic granite zircon U-Pb ages are 61-59 Ma,which corresponds to the same period as the magmatic arc of the southern limit of *** terms of geochemical composition,the granite is rich inω(SiO2)70.09%to 72.64%,with a highω(Al2O3)14.40%to 15.99%,a lowω(TiO2)0.08%to 0.24%,ω(MgO)0.41%to 0.76%,ω(Fe2O)6.82%to 29.9%,ω(P2Os)0.07%to 0.12%,andω(CaO)1.06%to 1.75%.The granite mainly belongs to the high-K calc-alkaline *** light rare earth element(LREE)content of skeletal granite is between 133.69×10^-6〜226.64×10^-6 and the heavy rare earth element(HREE)content is between 17.36×10^-6 and 32.11×10^-***/HREE is between 5.05 and *** is enriched in light rare earth elements(LREE)and large ion lithophile elements,such as Rb,K,U,etc.,depletes high field strength elements,such as P,Nb,and Ta,and has the geochemical composition of arc magmatic *** addition,the aluminum saturation index(A/CNK=1.06 to 1.11)of Cuobulaguo granite,belongs toⅠ-type *** comprehensive analysis showed that with the beginning of the collision between the Indian-Asian continental,the subduction ocean plate was separated from the continental plate due to gravity,resulting in an increase in the asthenosphere,which made partial fusion of the lithospheric *** invaded the bottom of the lower crust,which in turn induced a partial melting of the lower crust to form granite.

关键词： Petrogenesis Zircon U-Pb dating Cuobulaguo granite South margin of Gangdese Tibet

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Factors affecting directional migration of bone marrow mesenchymal stem cells to the injured spinal cord

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Neural Regeneration Research 2014年第18期9卷 1688-1695页

作者： Peng Xia su Pan Jieping Cheng Maoguang Yang Zhiping Qi Tingting Hou Xiaoyu Yang Department of Spine surgery Orthopedics HospitalSecond HosptalJilin University Department of Endocrinology Second HosptalJilin University

Microtubule-associated protein 1B plays an important role in axon guidance and neuronal migration. In the present study, we sought to discover the mechanisms underlying microtu- bule-associated protein 1B mediation of axon guidance and neuronal migration. We exposed bone marrow mesenchymal stem cells to okadaic acid or N-acetyl-D-erythro-sphingosine （an inhibitor and stimulator, respectively, of protein phosphatase 2A） for 24 hours. The expression of the phosphorylated form of type I microtubule-associated protein 1B in the cells was greater after exposure to okadaic acid and lower after N-acetyl-D-erythro-sphingosine. We then injected the bone marrow mesenchymal stem cells through the ear vein into rabbit models of spinal cord contusion. The migration of bone marrow mesenchymal stem cells towards the injured spinal cord was poorer in cells exposed to okadaic acid- and N-acetyl-D-erythro-sphingosine than in non-treated bone marrow mesenchymal stem cells. Finally, we blocked phosphatidylinosi- tol 3-kinase （PI3K） and extracellular signal-regulated kinase 1/2 （ERK1/2） pathways in rabbit bone marrow mesenchymal stem cells using the inhibitors LY294002 and U0126, respectively. LY294002 resulted in an elevated expression of phosphorylated type I microtubule-associated protein 1B, whereas U0126 caused a reduction in expression. The present data indicate that PI3K and ERKI/2 in bone marrow mesenchymal stem cells modulate the phosphorylation of micro- tubule-associated protein 1B via a cross-signaling network, and affect the migratory efficiency of bone marrow mesenchymal stem cells towards injured spinal cord.

关键词： nerve regeneration bone marrow mesenchymal stem cells spinal cord injury microtubule-associated protein 1 B protein phosphatase 2A cell transplantation phosphorylation signal transduction NSFC grant neural regeneration

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Masses for free-floating planets and dwarf planets

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Research in Astronomy and Astrophysics 2021年第6期21卷 207-221页

作者： Andrew Gould Wei-Cheng Zang Shude Mao su-Bo Dong Max-Planck-Institute for Astronomy Konigstuhl 17D-69117 HeidelbergGermany Department of Astronomy Ohio State University140 W.18th Ave.ColumbusOH 43210USA Department of Astronomy Tsinghua UniversityBeijing 100084China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China

The mass and distance functions of free-floating planets(FFPs) would give major insights into the formation and evolution of planetary systems, including any systematic differences between those in the disk and bulge. We show that the only way to measure the mass and distance of individual FFPs over a broad range of distances is to observe them simultaneously from two observatories separated by D ~ O(0.01 au)(to measure their microlens parallax πE) and to focus on the finite-source point-lens(FSPL) events(which yield the Einstein radius θE). By combining the existing KMTNet 3-telescope observatory with a 0.3 m 4 deg2 telescope at L2, of order 130 such measurements could be made over four years, down to about M ~ 6 M⊕for bulge FFPs and M ~ 0.7 M⊕for disk FFPs. The same experiment would return masses and distances for many bound planetary systems. A more ambitious experiment, with two 0.5 m satellites(one at L2 and the other nearer Earth) and similar camera layout but in the infrared, could measure masses and distances of sub-Moon mass objects, and thereby probe(and distinguish between) genuine sub-Moon FFPs and sub-Moon "dwarf planets" in exo-Kuiper Belts and exo-Oort Clouds.

关键词： gravitational lensing:micro

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D-dimer level and long-term outcome in patients with end-stage heart failure secondary to idiopathic dilated cardiomyopathy

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Journal of Geriatric Cardiology 2019年第8期16卷 621-629页

作者： Bi HUANG Yuan-Jing LI Jian SHEN Yuan YANG Gang LIU su-Xin LUO Department of Cardiology the First Affiliated Hospital of Chongqing Medical University

Background Previous studies had demonstrated hemostatic abnormalities in patients with heart failure (HF) and several studies have shown that abnormal coagulation indices, represented by elevated D-dimer, had prognostic significance in patients with compatible or acute decompensated HF. However, the impact of D-dimer on the outcome in patients with end-stage HF remains unclear. Methods A total of 244 consecutive patients with end-stage HF due to idiopathic dilated cardiomyopathy (DCM) were prospectively enrolled from February 2011 to September 2014. D-dimer levels were measured and its prognostic value was assessed. Primary endpoint was all-cause mortality during the follow-up period. Secondary endpoints were stroke, bleeding, occurrence of sustained ventricular tachycardia or ventricular fibrillation, and major adverse cardiovascular events (MACE). Results D-dimer was significantly elevated in the non-survivors (median: 0.8 vs. 1.1 mg/L, P superior to that of traditional prognostic markers.

关键词： D-dimer End-stage heart failure Idiopathic dilated cardiomyopathy Long-term outcome

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Arabidopsis RPD3-like histone deacetylases form multiple complexes involved in stress response

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Journal of Genetics and Genomics 2021年第5期48卷 369-383页

作者： Chao Feng Xue-Wei Cai Yin-Na su Lin Li She Chen Xin-Jian He College of Life Sciences Beijing Normal UniversityBeijing 100875China National Institute of Biological Sciences Beijing 102206China Tsinghua Institute of Multidisciplinary Biomedical Research Tsinghua UniversityBeijing 10084China

The Arabidopsis thaliana RPD3-type histone deacetylases have been known to form conserved SIN3-type histone deacetylase complexes,but whether they form other types of complexes is ***,we perform affinity purification followed by mass spectrometry and demonstrate that the Arabidopsis RPD3-type histone deacetylases HDA6 and HDA19 interact with several previously uncharacterized proteins,thereby forming three types of plant-specific histone deacetylase complexes,which we named SANT,ESANT,and ***-seq indicates that the newly identified components function together with HDA6 and HDA19 and coregulate the expression of a number of ***6 and HDA19 were previously thought to repress gene transcription by histone *** find that the histone deacetylase complexes can repress gene expression via both histone deacetylation-dependent and-independent *** the mutants of histone deacetylase complexes,the expression of a number of stressinduced genes is up-regulated,and several mutants of the histone deacetylase complexes show severe retardation in *** that growth retardation is thought to be a trade-off for an increase in stress tolerance,we infer that the histone deacetylase complexes identified in this study prevent overexpression of stress-induced genes and thereby ensure normal growth of plants under nonstress conditions.

关键词： Histone deacetylase Complex Transcription Development Stress response HDA6 HDA19

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Boron-catalyzed α-C–H fluorination of aryl acetic acids

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Organic Chemistry Frontiers 2022年第5期9卷 1315-1320页

作者： Haipeng Hu Cuilin Wang Xin Wu Yangu Liu Guizhou Yue Gehong su Juhua Feng College of Science Sichuan Agricultural University Ya’anSichuan625014P.R.China Sichuan Normal University Chengdu 610068P.R.China

The catalyticα-C–H fluorination of aryl acetic acids was achieved with good functional group tolerance in the presence of a boron catalyst.A series ofα-fluoro aryl acetic acids were obtained in a single step with high yields(up to 96%).The catalytic reaction was employed for the synthesis of bioactive molecules and the modification of profen ***,the reaction could be performed on a gram *** transformations were carried out.

关键词： catalyst acetic catalyzed

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Template-Free Synthesis of Ordered Mesoporous NiO/Poly (Sodium-4-Styrene sulfonate) Functionalized Carbon Nanotubes Composite for Electrochemical Capacitors

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Nano Research 2009年第9期2卷 722-732页

作者： Changzhou Yuan Shenglin Xiong Xiaogang Zhang Laifa Shen Fang Zhang Bao Gao Linhao su College of Material Science&Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

We report the first example of a practical and efficient template-free strategy for synthesizing ordered mesoporous NiO/poly(sodium-4-styrene sulfonate)(PSS)functionalized carbon nanotubes(FCNTs)composites by calcining a Ni(OH)_(2)/FCNTs precursor prepared by refl uxing an alkaline solution of Ni(NH_(3))x^(2)+and FCNTs at 97 oC for 1 *** morphology and structure were characterized by X-ray diffraction,scanning electron microscopy,and transmission electron *** decomposition of the precursor results in the formation of ordered mesoporous NiO/FCNTs composite(ca.48 wt%NiO)with large specifi c surface *** to its enhanced electronic conductivity and hierarchical(meso-and macro-)porosity,composite simultaneously meets the three requirements for energy storage in electrochemical capacitors at high rate,namely,good electron conductivity,highly accessibleelectrochemical surface areas owing to the existence of mesopores,and efficient mass transport from the *** data demonstrated that the ordered mesoporous NiO/FCNTs composite is capable of delivering a specifi c capacitance(SC)of 526 F/g at 1 A/g and a SC of 439 F/g even at 6 A/g,and show a degradation of only ca.6%in SC after 2000 continuous charge/discharge cycles.

关键词： Template-free ordered mesopores NiO/carbon nanotubes composite hierarchical porosity electrochemical supercapacitors

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A benzoxazine derivative specifically inhibits cell cycle progression in p53-wild type pulmonary adenocarcinoma cells

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Frontiers in Biology 2010年第2期5卷 180-186页

作者： Hua su Ling su Qiuxia HE Jing ZHAO Baoxiang ZHAO Shangli ZHANG Junying MIAO Institute of Developmental Biology School of Life ScienceShandong UniversityJinan 250100China The key Laboratory of Experimental Teratology Ministry of Education Jinan 250012China Institute of Organic Chemistry School of Chemistry and Chemical EngineeringShandong UniversityJinan 250100China

A fundamental aspect of cancer development is cancer cell *** for chemical agents that can interfere with cancer cell growth has been of great interest over the *** our study,we found that a benzoxazine derivative,(6-tert-butyl-3,4-dihydro-2Hbenzo[b][1,4]oxazin-3-yl)methanol(TBM),could inhibit cell growth and caused significant cell cycle arrest in pulmonary adenocarcinoma A549 and H460 cells with wild-type p53,while not affecting the cell cycle distribution in p53-deleted H1299 lung adenocarcinoma *** P53 plays an important role in regulating cell cycle progression,we analyzed the protein level of p53 by Western blot,and detected a significant elevation of p53 level after TBM treatment in A549 and H460 *** data suggested that TBM might specifically inhibit the proliferation of p53 wild-type lung adenocarcinoma cells through a p53-dependent cell cycle control *** interestingly,results indicated that TBM might serve as a useful tool for studying the molecular mechanisms of lung cancer cell growth and cell cycle control,especially for the biologic process regulated by P53.

关键词： (6-tert-butyl-3,4-dihydro-2H-benzo[b]oxazin-3-yl)methanol lung adenocarcinoma cells cell cycle arrest p53

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