Patrick Meir

Bio: Patrick Meir is an academic researcher from Australian National University. The author has contributed to research in topics: Ecosystem & Canopy. The author has an hindex of 80, co-authored 247 publications receiving 22882 citations. Previous affiliations of Patrick Meir include University of Edinburgh & University of Exeter.

Drought sensitivity of the Amazon rainforest.

Abstract: Amazon forests are a key but poorly understood component of the global carbon cycle. If, as anticipated, they dry this century, they might accelerate climate change through carbon losses and changed surface energy balances. We used records from multiple long-term monitoring plots across Amazonia to assess forest responses to the intense 2005 drought, a possible analog of future events. Affected forest lost biomass, reversing a large long-term carbon sink, with the greatest impacts observed where the dry season was unusually intense. Relative to pre-2005 conditions, forest subjected to a 100-millimeter increase in water deficit lost 5.3 megagrams of aboveground biomass of carbon per hectare. The drought had a total biomass carbon impact of 1.2 to 1.6 petagrams (1.2 × 1015 to 1.6 × 1015 grams). Amazon forests therefore appear vulnerable to increasing moisture stress, with the potential for large carbon losses to exert feedback on climate change.

Photosynthesis: from Light to Biosphere

Abstract: On light energy as limiting factor for H+-upake and ATP-generation by chromatophores from Rhodopseudomonas palustris. 19 Knobloch K., Pirner B. pH-dependent changes of active/inactive State equilibrium of chloroplast H+-ATPase. Malyan A.N., Vitseva O.I. 23 Cloning and expression of the Fl a subunit from the Rhodospirillum rubrum F0F1 ATP synthase. Du Z., Gromet-Elhanan Z. 27 Nucleotides at catalytic sites of CF0F1 in thylakoids. Seybold A.L., Gräber P. 31 Biochemical characterization of thylakoids and CF0CF1 isolated from Chlamydomonas reinhardtii CW15 and from atpA and atpB deletion mutants. Approaches to the problem of photophosphorylation in vivo. 43 F-type and P-type ATPases in cyanobacteria : implications for energy conservation and utilization. Functional expression of the ß subunit of the Rhodospirillum rubrum Fl-ATPase. Nathanson L., Gromet-Elhanan Z. 51 Generation of an intermolecular tension between CFO and CF1 as consequence of a transmembrane electrochemical proton gradient. The ATP synthase CF0CF1 : two different types of proton flow, slipping and coupled, trigger the same conformational change in CF1. Fritsche O., Junge W. 59 Proteolyse cleavage of the \"yg subunit of membrane bound chloroplast coupling factor I. viii Cooperative interaction between the active Sites of CF1-ATPase. Hochman Y., Carmeli C. 67 ATP synthase of Synechocystis sp. PCC6803 : reassembly of Fl from its recombinant subunits. A patch-clamp study on the regulation of electrogenesis by protons. 87 Crosslinking the Fl-part of chloroplast ATPase in different conformational states. Schumann D., Bickel-Sandkötter S. 91 Energization changes the reactivities of lysine residues of the chloroplast ATP synthase 7g subunit. Komatsu-Takati M. 95 Anion and cation Channels in the thylakoid membrane. Pottosin LI., Schönknecht G. 99 Ca2+ Stimulation of the exchange of trinitrophenyl-ADP (TNT-ADP) tightly bound to the chloroplast coupling factor (CF1) for medium nucleotide. 103 2\\3'-0-(2,4,6-trirütrophenyl)-ADP bound on two different sites of chloroplast coupling factor ATPase covalently under photosynthetic condition. Hisabori T., Strotmann H. 107 ATP synthesis by co-reconstituted proteoliposomes : bacteriorhodopsin/ATP synthases. 111 Antimycin A inhibits QE-quenching by a protonophoric mechanism. Yerkes CT., Crofts A.R. 115 The metal binding sites of chloroplast Fl-ATPase studied by pulsed EPR spectroscopy. Effects of tentoxin and analogues on ATPasic properties of CF1 and TF1. The participation of metals in the CF1-ATPase mechanism. Catalytic function of a vital carboxylate residue in the beta subunit of the CF1-ATPase from C. reinhardtii. The structure of a transition State inhibitor of chloroplast CF1-ATPase as determined by X-ray absorption of vanadate. Refined measurement of the H+/ATP coupling ratio at the …

TRY plant trait database : Enhanced coverage and open access

Abstract: Plant traits-the morphological, anatomical, physiological, biochemical and phenological characteristics of plants-determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research spanning from evolutionary biology, community and functional ecology, to biodiversity conservation, ecosystem and landscape management, restoration, biogeography and earth system modelling. Since its foundation in 2007, the TRY database of plant traits has grown continuously. It now provides unprecedented data coverage under an open access data policy and is the main plant trait database used by the research community worldwide. Increasingly, the TRY database also supports new frontiers of trait-based plant research, including the identification of data gaps and the subsequent mobilization or measurement of new data. To support this development, in this article we evaluate the extent of the trait data compiled in TRY and analyse emerging patterns of data coverage and representativeness. Best species coverage is achieved for categorical traits-almost complete coverage for 'plant growth form'. However, most traits relevant for ecology and vegetation modelling are characterized by continuous intraspecific variation and trait-environmental relationships. These traits have to be measured on individual plants in their respective environment. Despite unprecedented data coverage, we observe a humbling lack of completeness and representativeness of these continuous traits in many aspects. We, therefore, conclude that reducing data gaps and biases in the TRY database remains a key challenge and requires a coordinated approach to data mobilization and trait measurements. This can only be achieved in collaboration with other initiatives.

Exploring the likelihood and mechanism of a climate-change-induced dieback of the Amazon rainforest.

Abstract: We examine the evidence for the possibility that 21st-century climate change may cause a large-scale "dieback" or degradation of Amazonian rainforest. We employ a new framework for evaluating the rainfall regime of tropical forests and from this deduce precipitation-based boundaries for current forest viability. We then examine climate simulations by 19 global climate models (GCMs) in this context and find that most tend to underestimate current rainfall. GCMs also vary greatly in their projections of future climate change in Amazonia. We attempt to take into account the differences between GCM-simulated and observed rainfall regimes in the 20th century. Our analysis suggests that dry-season water stress is likely to increase in E. Amazonia over the 21st century, but the region tends toward a climate more appropriate to seasonal forest than to savanna. These seasonal forests may be resilient to seasonal drought but are likely to face intensified water stress caused by higher temperatures and to be vulnerable to fires, which are at present naturally rare in much of Amazonia. The spread of fire ignition associated with advancing deforestation, logging, and fragmentation may act as nucleation points that trigger the transition of these seasonal forests into fire-dominated, low biomass forests. Conversely, deliberate limitation of deforestation and fire may be an effective intervention to maintain Amazonian forest resilience in the face of imposed 21st-century climate change. Such intervention may be enough to navigate E. Amazonia away from a possible "tipping point," beyond which extensive rainforest would become unsustainable.

疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A

Abstract: 抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

Bowling alone: The collapse and revival of American community

Abstract: The present historical moment may seem a particularly inopportune time to review Bowling Alone, Robert Putnam's latest exploration of civic decline in America. After all, the outpouring of volunteerism, solidarity, patriotism, and self-sacrifice displayed by Americans in the wake of the September 11 terrorist attacks appears to fly in the face of Putnam's central argument: that \"social capital\" -defined as \"social networks and the norms of reciprocity and trustworthiness that arise from them\" (p. 19)'has declined to dangerously low levels in America over the last three decades. However, Putnam is not fazed in the least by the recent effusion of solidarity. Quite the contrary, he sees in it the potential to \"reverse what has been a 30to 40-year steady decline in most measures of connectedness or community.\"' As an example of how the current \"war on terrorism\" could generate a durable civic renewal, Putnam points to the burst in civic practices that occurred during and after World War II, which he says \"permanently marked\" the generation that lived through it and had a \"terrific effect on American public life over the last half-century.\" 3 If Americans can follow this example and channel their current civic

Modern Applied Statistics With S

Abstract: Thank you very much for downloading modern applied statistics with s. As you may know, people have search hundreds times for their favorite readings like this modern applied statistics with s, but end up in harmful downloads. Rather than reading a good book with a cup of coffee in the afternoon, instead they cope with some harmful virus inside their laptop. modern applied statistics with s is available in our digital library an online access to it is set as public so you can download it instantly. Our digital library saves in multiple countries, allowing you to get the most less latency time to download any of our books like this one. Kindly say, the modern applied statistics with s is universally compatible with any devices to read.