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Stem radial Co_2 conductance affects stem respiratory Co_2 fluxes in ash and birch trees

journal of Forestry research 2019年第1期30卷 21-29页

作者： Xiuwei Wang Zijun Mao M.A.McGuire r.o.Teskey School of Forestry Northeast Forestry University Key Laboratory of Forest Plant Ecology of Ministry of Education Northeast Forestry University Warnell School of Forestry and Natural resources University of Georgia

The Co_2 released from respiring cells in woody tissues of trees can contribute to one of three fluxes:efflux to the atmosphere(E_A),internal xylem sap transport flux(F_T),and storage flux(DS).Adding those fluxes together provides an estimate of actual stem respiration(r_S).We know that the relative proportion of Co_2 in those fluxes varies greatly among tree species,but we do not yet have a clear understanding of the causes for this *** possible explanation is that species differ in stem radial Co_2 conductance(g_c).A high g_c would favor the E_A pathway and a low g_cwould favor the F_***,g_chas only been measured once in situ and only in a single tree *** measured g_cusing two methods in stems of Fraxinus mandshurica rupr.(ash)and Betula platyphylla Suk.(birch)trees in situ,along with r_S,E_A,F_T and *** radial Co_2 conductance was substantially greater in ash trees than in birch *** to that finding,in ash trees over 24 h,E_Aconstituted the entire flux of respired Co_2 ,and F_Twas negative,indicating that additional Co_2 ,probably transported from the root system via the xylem,was also diffusing into the *** ash trees,F_T was negative over the entire 24 h,and this study represents the first time that has been *** addition of xylem-transported Co_2 to E_A caused E_Ato be 9% higher than the actual r_Sover the diel measurement *** trees,which had lower g_c,also had a more commonly seen pattern,with E_A accounting for about 80% of the Co_2 released from local cell respiration and F_T accounting for the *** inorganic carbon concentration in xylem sap was also lower in ash trees than in birch trees:2.7 versus 5.3 mmol L^(-1),*** results indicate that stem Co_2 conductance could be a very useful measurement to help explain differences among species in the proportion of respired Co_2 that remains in the xylem or diffuses into the atmosphere.

关键词： Stem Co2 conductance Stem respiration Stem Co2 efflux Transport flux Stem temperature Sap flow Sap flux density

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Doping Effect of Poly(vinylidene fluoride) on carbon Nanofibers Deduced by Thermoelectric Analysis of Their Melt Mixed Films

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Chinese journal of Polymer Science 2024年第11期 1802-1810页

作者： A.J.Paleo V.M.Serrato J.M.Mánuel o.Toledano E.Mu?oz M.Melle-Franco B.Krause P.P?tschke K.Lozano 2C2T-Centre for Textile Science and Technology University of Minho Campus de Azurém Florida Institute of Technology The Aerospace Corporation Department of Condensed Matter Physics and Institute of research on Electron Microscopy and Materials(IMEYMAT) Faculty of Sciences University of Cádiz CICECo – Aveiro Institute of Materials Department of Chemistry University of Aveiro UNED-Universidad Nacional de Educación a Distancia Facultad de Física Pontificia Universidad Católica de Chile Leibniz-Institut für Polymerforschung Dresden e.V.IPF Department of Mechanical Engineering University of Texas Rio Grande Valley

The effect of temperature on the electrical conductivity （σ） and Seebeck coefficient （S） of n-type vapor grown carbon nanofibers （CNFs）and poly（vinylidene fluoride）(PVDF) melt-mixed with 15 wt%of those CNFs is *** 40°C,the CNFs show stable n-type character (S=-4.8μV·K-1) with anσof ca.165 S·m-1,while the PVDF/CNF composite film shows anσof ca.9 S·m-1and near-zero S (S=-0.5μV·K-1).This experimental reduction in S is studied by the density functional tight binding （DFTB） method revealing a contact electron transfer from the CNFs to the PVDF in the ***,in the temperature range from 40°C to 100°C,theσ（T） of the CNFs and PVDF/CNF film,successfully described by the 3D variable range hopping （VrH） model,is explained as consequence of a thermally activated backscattering *** the contrary,the S（T）from 40°C to 100°C of the PVDF/CNF film,which satisfactorily matches the model proposed for some multi-walled carbon nanotube （MWCNT）doped mats;however,it does not follow the increase in S（T） found for *** these findings are presented with the aim of discerning the role of these n-type vapor grown carbon nanofibers on theσand S of their melt-mixed polymer composites.

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Twenty years of population dynamics in European beech-oak forest at their rear range margin anticipate changes in its structure and composition

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Forest Ecosystems 2024年第3期11卷 358-370页

作者： álvaro rubio-Cuadrado Iciar alberdi Isabel canellas Fernando Montes Jesús rodríguez-calcerrada rosana López Guillermo G.Gordaliza María Valbuena-carabana Nikos Nanos ramón Perea Luis Gil Departamento de dinamica y gestion forestal Instituto de Ciencias Forestales(ICIFOR-INIA)CSICCtra.La Coruna km 7.528040MadridSpain Departamento de Sistemas y recursos Naturales Escuela Tecnica Superior de Ingeniería de MontesForestal y del Medio NaturalUniversidad Politecnica de Madrid.Ciudad Universitaria s/n28040MadridSpain School of Forestry and Natural Environment Aristotle University of ThessalonikiUniversity Campus54124ThessalonikiGreece

There is an increasing interest in restoring degraded forests,which occupy half of the forest *** the forms of restoration,passive restoration,which involves the elimination of degrading factors and the free evolution of natural dynamics by applying minimal or no management,is gaining *** dynamics is difficult to predict due to the influence of multiple interacting factors such as climatic and edaphic conditions,composition and abundance of species,and the successional character of these ***,we study the natural dynamics of a mixed forest located in central Spain,which maintained an open forest structure,due to intensive use,until grazing and cutting were banned in the *** most frequent woody species in this forest are Fagus sylvatica,Quercus petraea,Quercus pyrenaica,Ilex aquifolium,Sorbus aucuparia,Sorbus aria and Prunus avium,with contrasting shade and drought *** species are common in temperate European deciduous forest and are found here near their southern distribution limit,except for *** order to analyze forest dynamics and composition,three inventories were carried out in 1994,2005 and *** results show that,despite the Mediterranean influence,the natural dynamics of this forest has been mainly determined by different levels of shade *** the abandonment of grazing and cutting,*** expanded rapidly due to its lower shade tolerance,whereas after canopy closure and forest densification,shade-tolerant species gained ground,particularly ***,despite its lower drought and late-frost *** the current dynamics continue,*** will overtake the rest of the species,which will be relegated to sites with shallow soils and steep ***,all the multi-centennial beech trees,which are undergoing a rapid mortality and decline process,will disappear.

关键词： Forest succession Secondary forest Woodland Mixed forest Competition recruitment

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Challenges and opportunities Modeling the Dynamic Tumor Matrisome

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Biomedical Engineering Frontiers 2023年第1期4卷 239-246页

作者： Shelly r.Peyton Manu o.Platt Edna Cukierman Department of Chemical Engineering University of Massachusetts AmherstAmherstMAUSA Coulter Department of Biomedical Engineering Georgia Institute of Technology and Emory UniversityAtlantaGAUSA cancer Signaling&Microenvironment Program Marvin and Concetta Greenberg Pancreatic Cancer Institute.Fox Chase Cancer CenterTemple HealthPhiladelphiaPAUSA

We need novel strategies to target the complexity of cancer and,particularly,of metastatic *** an example of this complexity,certain tissues are particularly hospitable environments for metastases,whereas others do not contain fertile microenvironments to support cancer cell *** evidence that the extracellular matrix(ECM)of tissues is one of a host of factors necessary to support cancer cell growth at both primary and secondary tissue sites is *** on cancer metastasis has largely been focused on the molecular adaptations of tumor cells in various cytokine and growth factor environments on 2-dimensional tissue culture polystyrene *** imaging,conversely,has transformed our ability to watch,in real time,tumor cell invasion,intravasation,extravasation,and *** the interstitial ECM that supports all cells in the tumor microenvironment changes over time scales outside the possible window of typical intravital imaging,bioengineers are continuously developing both simple and sophisticated in vitro controlled environments to study tumor(and other)cell interactions with this *** this perspective,we focus on the cellular unit responsible for upholding the pathologic homeostasis of tumor-bearing organs,cancer-associated fibroblasts(caFs),and their selfgenerated *** latter,together with tumoral and other cell secreted factors,constitute the“tumor matrisome”.We share the challenges and opportunities for modeling this dynamic caF/ECM unit,the tools and techniques available,and how the tumor matrisome is remodeled(e.g.,via ECM proteases).We posit that increasing information on tumor matrisome dynamics may lead the field to alternative strategies for personalized medicine outside genomics.

关键词： invasion organs environments

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Achillea biebersteinii extracts suppress angiogenesis and enhance sensitivity to 5-fluorouracil of human colon cancer cells via the PTEN/AKT/mTor pathway in vitro

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Asian Pacific journal of Tropical Biomedicine 2020年第11期10卷 505-515页

作者： Mehmet Kadir Erdoğan can Ali Ağca Hakan Aşkın Department of Biology Faculty of Arts and SciencesBingol University12000BingolTurkey Department of Molecular Biology and Genetics Faculty of Arts and SciencesBingol University12000BingolTurkey Department of Molecular Biology and Genetics Faculty of SciencesAtaturk University25000ErzurumTurkey

objective:To investigate the antiproliferative,anti-angiogenic,and apoptotic effects of extracts of Achillea biebersteinii(ABE)and combined treatments of ABE with 5-fluorouracil(5-FU)on HT-29 ***:The effects of ABE,5-FU,and combined treatments on the viability of HT-29 cells were determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide *** analysis was used to determine synergism between ABE and *** apoptotic and anti-angiogenic effects were determined by cell death detection and human vascular endothelial growth factor ELISA method,*** and translational expressions of p53,Bax,Bcl-2,p38 MAPK,Akt,PTEN,and m Tor were also evaluated by real-time PCr and Western blotting ***:ABE decreased the viability of HT-29 cells in a dosedependent *** treatment of hexane,chloroform,and methanol extracts of Achillea biebersteinii with 5-FU at IC50 doses decreased the cell viability to 26.0%,19.1%,and 14.9%,respectively(Prthermore,ABE treatment alone and combination with 5-FU,induced apoptosis,significantly downregulated m Tor,Akt,Bcl-2 expression,upregulated p53,Bax,PTEN,p38 MAPK expression,and exhibited anti-angiogenetic ***:our findings indicate that ABE shows synergism with 5-FU and inhibits the proliferation of HT-29 cells by inducing apoptosis and suppressing angiogenesis,which may provide biological evidence for further use of ABE in the treatment of colorectal cancer.

关键词： angiogenesis doses colon

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增材制造Ti6Al4V合金的闪速等离子体电解氧化与在生理介质中的电化学行为

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Transactions of Nonferrous Metals Society of China 2024年第4期34卷 1150-1166页

作者： H.MorA-SANCHEZ C.rAMoS M.MoHEDANo B.TorrES r.ArrABAL E.MATYKINA Departamento de Ingeniería Química y de Materiales Facultad de Ciencias QuímicasUniversidad Complutense de Madrid28040 MadridSpain CIDETEC Basque Research and Technology Alliance(BRTA)Po.Miramón 19620014 Donostia-San SebastiánSpain Departamento Matemática Aplicada Ciencia e Ingeniería de Materiales y Tecnología ElectrónicaUniversidad Rey Juan CarlosC/Tulipán s/nMóstoles 28933MadridSpain

研究激光粉末床熔融增材制造(AM)(又称直接金属激光烧结)技术制备的Ti6Al4V合金等离子体电解氧化(PEo)处理及其电化学行为。通过短时间(<120 s)PEo处理(也称闪速PEo),在AM合金和传统合金表面制备了3~10μm厚、含ca和P的涂层。然后在改... 详细信息

研究激光粉末床熔融增材制造(AM)(又称直接金属激光烧结)技术制备的Ti6Al4V合金等离子体电解氧化(PEo)处理及其电化学行为。通过短时间(o处理(也称闪速PEo),在AM合金和传统合金表面制备了3~10μm厚、含ca和P的涂层。然后在改良的α-MEM溶液中,通过动电位极化曲线和电化学阻抗谱(EIS)评估了合金的电化学行为。与传统合金相比,AM合金中形成了细小的层片状α显微组织和层间小尺寸的β相颗粒,这促使了火花的产生,从而促进了PEo涂层的生长。闪速PEo涂层提高了传统合金和AM合金的耐腐蚀性,最薄的涂层(o处理也足以成功避免这种情况。

关键词：增材制造激光粉末床熔融等离子体电解氧化闪速PEo 钛缝隙腐蚀 α-MEM

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radiation protection for the interventional cardiologist:Practical approach and innovations

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World journal of cardiology 2022年第1期14卷 1-12页

作者： Alejandro Gutierrez-Barrios Dolores cañadas-Pruaño Inmaculada Noval-Morillas Livia Gheorghe ricardo Zayas-rueda German calle-Perez Department of cardiology Hospital Puerta del MarCadiz 11009Spain

Use of ionizing radiation during cardiac catheterization interventions adversely impacts both the patients and medical *** recent years,radiation dose in cardiac catheterization interventions has become a topic of increasing interest in interventional cardiology and there is a strong interest in reducing radiation exposure during the *** review presents the current status of radiation protection in the cardiac catheterization laboratory and summarizes a practical approach for radiation dose management for minimizing radiation *** review also presents recent innovations that have clinical potential for reducing radiation during cardiac interventions.

关键词： radiation cardiac catheterization Quality improvement cathlab Ionizing radiation

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Influence of broken kernels content on soybean quality during storage

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Grain & oil Science and Technology 2024年第2期7卷 105-112页

作者： Lazaro da Costa Correa canizares Cesar Augusto Gaioso Newiton da Silva Timm Silvia Leticia rivero Meza Adriano Hirsch ramos Maurício de oliveira Everton Lutz Moacir cardoso Elias Department of Agroindustry Science and Technology Federal University of PelotasPelotasRio Grande do Sul 96010-900Brazil Information and Communication Technological Axis Federal Institute of EducationScienceand Technology FarroupilhaCampus PanambiPanambiRio Grande do Sul 98280-000Brazil

Although it is recognized that the post-harvest system is most responsible for the loss of soybean quality,the real impact of this loss is still *** regulation allows 15%and 30%of broken soybean for group I and group II(quality groups),***,the industry is not informed about the loss in the quality parameters of soybeans and its impacts during long-term ***,the objective was to evaluate the effect of the breakage kernel percentage of soybean stored for 12 *** of 15% of breakage kernels did not affect soybean ***,content of 30% of breakage kernels affected significantly soybean quality,which was evidenced by the increase of up to 75% in moldy soybeans,72% in acidity,50% in leached solids,27% in electrical conductivity,and the decrease of up to 12% in soluble protein,6.4% in germination and 3.5% in thousand kernel weight after 8 months of *** the legislation establishes a percentage limit,it is recommended to store soybeans with up to 15% breakage *** the contrary,values higher than that can cause a significant reduction in soybean quality,resulting in commercial losses.

关键词： Soybean quality Breakage kernels Storage problems Grain defects Quality parameters

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DNA direct reversal repair and alkylating agent drug resistance

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cancer Drug resistance 2021年第2期4卷 414-423页

作者： roberto Gutierrez Timothy r.o’Connor Department of cancer Biology Beckman Research InstituteCity of HopeDuarteCA 91010USA Irell&Manella Graduate School of Biological Sciences City of HopeDuarteCA 91010USA Department of cancer Biology Beckman Research InstituteCity of HopeDuarteCA 91010USA.

DNA direct reversal repair(Drr)is unique in that no DNA synthesis is required to correct the error and therefore repair via such mechanisms are *** humans,Drr is carried out by two different pathways:the o6-methylguanine-DNA methyltransferase(MGMT)and the alkylated DNA repair protein B(AlkB)*** use of alkylating agents is the standard of care for many ***,the use of those drugs is usually halted when resistance *** review will examine repair of alkylating agent damage mediated by Drr,resistance mechanisms and potential ways to overcome such resistance.

关键词： Direct reversal repair o6-methylguanine-DNA methyltransferase AlkB homologs resistance to alkylating agents

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A simplified noncryogenic strategy to transport mesenchymal stem cells: Potential applications in cell therapy and regenerative medicine

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Genes & Diseases 2024年第3期11卷 26-29页

作者： Xiangyu Dong Yannian Gou Meichun Guo Jiamin Zhong Aohua Li Ailing Hao Wei Zeng rex C.Haydon Hue H.Luu russell r.reid Tongchuan He Yan Xu Jiaming Fan Ministry of Education Key Laboratory of Diagnostic Medicine And Department of Clinical BiochemistryCollege of Laboratory MedicineChongqing Medical UniversityChongqing 400016China Molecular oncology Laboratory Department of Orthopaedic Surgery and Rehabilitation MedicineThe University of Chicago Medical CenterChicagoIL 60637USA Department of Interventional Neurology The First Dongguan Affiliated HospitalGuangdong Medical UniversityDongguanGuangdong 523475China Laboratory of Craniofacial Suture Biology and Development Department of Surgery Section of Plastic SurgeryThe University of Chicago Medical CenterChicagoIL 60637USA Institute of Sports Medicine Beijing Key Laboratory of Sports InjuriesPeking University Third HospitalBejing 100191China

With the rapid advances in stem cell research and po-tential cell-based therapies,there is an urgent need to develop safe and reliable cell transport *** for autologous stem cell-based therapies,allogeneic stem cell therapies and ex vivo genetically engineered cell therapies would require safe,efficient,and reliable cell preservation and transport methods.

关键词： transport methods simplified

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