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| 1 | Ecoregional variations of aboveground biomass and stand structure in evergreen broadleaved forests显示文摘Biotic and abiotic factors control aboveground biomass(AGB)and the structure of forest ecosystems.This study analyses the variation of AGB and stand structure of evergreen broadleaved forests among six ecoregions of Vietnam.A data set of 1731-ha plots from 52 locations in undisturbed old-growth forests was developed.The results indicate that basal area and AGB are closely correlated with annual precipitation,but not with annual temperature,evaporation or hours of sunshine.Basal area and AGB are positively correlated with trees>30 cm DBH.Most areas surveyed(52.6%)in these old-growth forests had AGB of 100–200 Mg ha^-1;5.2%had AGB of 400–500 Mg ha^-1,and 0.6%had AGB of>800 Mg ha^-1.Seventy percent of the areas surveyed had stand densities of 300–600 ind.ha^-1,and 64%had basal areas of 20–40 m^2 ha^-1.Precipitation is an important factor influencing the AGB of old-growth,evergreen broadleaved forests in Vietnam.Disturbances causing the loss of large-diameter trees(e.g.,>100 cm DBH)affects AGB but may not seriously affect stand density. | Tran Van Do Mamoru Yamamoto Osamu Kozan Vo Dai Hai Phung Dinh Trung Nguyen Toan Thang Lai Thanh Hai Vu Thanh Nam Trieu Thai Hung Hoang Van Thang Tran Duc Manh Cao Chi Khiem Vu Tien Lam Nguyen Quang Hung Tran Hoang Quy Pham Quang Tuyen Trinh Ngoc Bon Nguyen Thi Thu Phuong Ninh Viet Khuong Nguyen Van Tuan Dang Thi Hai Ha Tran Hai Long Dang Van Thuyet Dang Thinh Trieu Nguyen Van Thinh Tran Anh Hai Duong Quang Trung Nguyen Van Bich Dinh Hai Dang Pham Tien Dung Nguyen Huy Hoang Le Thi Hanh Phan Minh Quang Nguyen Thi Thuy Huong Hoang Thanh Son Nguyen Thanh Son Nguyen Thi Van Anh Nguyen Thi Hoai Anh Pham Dinh Sam Hoang Thi Nhung Hoang Van Thanh Nguyen Huu Thinh Tran Hong Van Ho Trung Luong Bui Kieu Hung | 2020 | Journal of Forestry Research2020，31，5： | 1 |
| 2 | DNA-PKcs promotes alcohol-related liver disease by activating Drp1-related mitochondrial fission and repressing FUNDC1-required mitophagy显示文摘DNA-dependent protein kinase catalytic subunit(DNA-PKcs)is a novel housekeeper of hepatic mitochondrial homeostasis outside the DNA repair process.In this study,DNA-PKcs was upregulated in the livers of mice that were exposed to alcohol;the expression of DNA-PKcs positively correlated with hepatic steatosis,fibrosis,apoptosis,and mitochondrial damage.Functional studies revealed that liver-specific DNA-PKcs knockout(DNA-PKcsLKO)mice were protected from chronic ethanol-induced liver injury and mitochondrial damage.Mechanistic investigations established that DNA-PKcs promoted p53 activation,which elevated dynamin-related protein 1(Drp1)-related mitochondrial fission but repressed FUN14 domain containing 1(FUNDC1)-required mitophagy.Excessive fission and defective mitophagy triggered mtDNA damage,mitochondrial respiratory inhibition,mROS overproduction,cardiolipin oxidation,redox imbalance,calcium overload,and hepatic mitochondrial apoptosis.In contrast,the deletion of DNA-PKcs rescued these phenotypic alterations,which alleviated the susceptibility of hepatocytes to alcohol-induced cytotoxicity.Additionally,we also showed that orphan nuclear receptor subfamily 4 group A member 1(NR4A1)was the upstream signal for DNA-PKcs activation and that the genetic ablation of NR4A1 ameliorated the progression of alcohol-related liver disease(ARLD);these results were similar to those obtained in DNA-PKcs knockout mice.Collectively,our results identified the NR4A1/DNA-PKcs/p53 axis as a novel signaling pathway responsible for ARLD pathogenesis that acts by activating Drp1-related mitochondrial fission and restricting FUNDC1-required mitophagy.The findings have potential implications for new approaches for ARLD therapy. | Hao Zhou Pingjun Zhu Jin Wang Sam Toan Jun Ren | 2019 | Signal Transduction and Targeted Therapy2019，4，1： | 1 |
| 3 | Graphene-based electrodes and catalysts for electroreduction of CO_(2)to low-carbon alcohols显示文摘The electrochemical reduction of CO_(2)(CO_(2)ER)into the renewable and sustainable green fuels,such as low-carbon alcohols,is one of several workable strategies.CO_(2)ER can be combined with renewable electricity to transform intermittent energy sources(such as wind,hydro,and solar)into a fuel that can be stored until it is ready to be used.The intrinsic characteristics of the employed catalyst have a significant and substantial effect on the efficiency of CO_(2)ER and the ensuing economic viability.The paradigmatic multicarbon alcohol catalysts should increase the concentration of*CO in the reaction environment,stabilize the key intermediate products during the reaction,and facilitate the C-C coupling interaction.Since graphene has a large surface area and exceptional conductivity,it has been used as a support for active phases(nanoparticles or nanosheets).It is possible for graphene to enhance charge transport and accelerate CO_(2)conversion through its electronic and structural coupling effects.At the interface,a synergy can be produced that improves CO_(2)ER by increasing*CO adsorption,intermediate binding,and stability.This article focuses on recent advancements in graphene-based catalysts that promote CO_(2)ER to alcohols.Likewise,this paper also describes and discusses the key role graphene plays in catalyzing CO_(2)ER into alcohols.Finally,we hope to provide future ideas for the design of graphene-based electrocatalysts. | Lei Wang Patrick Lira Guangzhi Hu Jianmin Luo Zhao Sun Richard Davis Yudai Huang Sam Toan | 2023 | Materials Reports(Energy)2023，3，2： | 0 |
| 4 | Thermodynamics of NaHCO_3 decomposition during Na_2CO_3-based CO_2 capture显示文摘Amine-basedcarbon-capture technologies have been shown to be energetically expensive and to cause significant environmental and epidemiological impacts due to their volatility.Bicarbonate formation from carbon dioxide's reaction with water has been suggested as an effective alternative for capturing CO_2;however,the thermodynamics of this reaction are not well understood.This study experimentally determined the equilibrium constant of sodium bicarbonate(Na HCO_3)decomposition to sodium,water,and carbon dioxide;the study also compared the equilibrium constant to theoretical calculations.Using a combination of experimentation and thermodynamic relationships,the unitless equilibrium constants of the forward and reverse reactions were calculated accurately(error<±9%and<±4%,respectively).Equilibrium data were calculated using enthalpy and entropy values of each component of Na HCO_3decomposition at temperatures ranging from 25 to 155°C respectively.These results offer more data essential to optimizing Na HCO_3use in environmentally friendly nextgeneration CO_2-capture technologies. | Sam Toan William O'Dell Christopher K.Russell Sun Zhao Qinghua Lai Huiping Song Ying Zhao Maohong Fan | 2019 | Journal of Environmental Sciences2019，31，4： | 0 |
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