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Christopher E. Doughty Gregory R. Goldsmith Nicolas Raab Cecile A. J. Girardin Filio Farfan‐Amezquita Walter Huaraca‐Huasco Javier E. Silva‐Espejo Alejandro Araujo‐Murakami Antonio C. L. da Costa Wanderley Rocha David Galbraith Patrick Meir Dan B. Metcalfe Yadvinder Malhi 《Biotropica》2018,50(1):16-25
Why do some forests produce biomass more efficiently than others? Variations in Carbon Use Efficiency (CUE: total Net Primary Production (NPP)/ Gross Primary Production (GPP)) may be due to changes in wood residence time (Biomass/NPPwood), temperature, or soil nutrient status. We tested these hypotheses in 14, one ha plots across Amazonian and Andean forests where we measured most key components of net primary production (NPP: wood, fine roots, and leaves) and autotrophic respiration (Ra; wood, rhizosphere, and leaf respiration). We found that lower fertility sites were less efficient at producing biomass and had higher rhizosphere respiration, indicating increased carbon allocation to belowground components. We then compared wood respiration to wood growth and rhizosphere respiration to fine root growth and found that forests with residence times <40 yrs had significantly lower maintenance respiration for both wood and fine roots than forests with residence times >40 yrs. A comparison of rhizosphere respiration to fine root growth showed that rhizosphere growth respiration was significantly greater at low fertility sites. Overall, we found that Amazonian forests produce biomass less efficiently in stands with residence times >40 yrs and in stands with lower fertility, but changes to long‐term mean annual temperatures do not impact CUE. 相似文献
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N-demethylation of aminopyrine and C-hydroxylation of aniline by hepatic microsomal enzymes were measured during exposure to cigarette smoke. Metabolism of aminopyrine during smoke exposure was not significantly altered. Metabolism of aniline during smoke exposure was inhibited 70–80% (P < .001) thus indicating that an initial effect of exposure to cigarette smoke is a decreased rate of biotransformation via C-hydroxylation. This finding, coupled with the findings of other investigators who have shown that the delayed effect of exposure to cigarette smoke is induction of hydroxylase activity, suggests that cigarette smoke produces a biphasic alteration in certain hepatic biotransformation processes. 相似文献
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The linkages between photosynthesis,productivity, growth and biomass in lowland Amazonian forests 总被引:1,自引:0,他引:1 下载免费PDF全文
Yadvinder Malhi Christopher E. Doughty Gregory R. Goldsmith Daniel B. Metcalfe Cécile A. J. Girardin Toby R. Marthews Jhon del Aguila‐Pasquel Luiz E. O. C. Aragão Alejandro Araujo‐Murakami Paulo Brando Antonio C. L. da Costa Javier E. Silva‐Espejo Filio Farfán Amézquita David R. Galbraith Carlos A. Quesada Wanderley Rocha Norma Salinas‐Revilla Divino Silvério Patrick Meir Oliver L. Phillips 《Global Change Biology》2015,21(6):2283-2295
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The family of 14‐3‐3 proteins and specifically 14‐3‐3σ are up‐regulated during the development of renal pathologies 下载免费PDF全文
Myrto Rizou Eleni A. Frangou Filio Marineli Niki Prakoura Jerome Zoidakis Harikleia Gakiopoulou George Liapis Panagiotis Kavvadas Christos Chatziantoniou Manousos Makridakis Antonia Vlahou John Boletis Demetrios Vlahakos Dimitrios Goumenos Evgenios Daphnis Christos Iatrou Aristidis S. Charonis 《Journal of cellular and molecular medicine》2018,22(9):4139-4149
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