ALBERT

Beschreibung: Biodiversity experiments have shown that species loss reduces ecosystem functioning in grassland. To test whether this result can be extrapolated to forests, the main contributors to terrestrial primary productivity, requires large-scale experiments. We manipulated tree species richness by planting more than 150,000 trees in plots with 1 to 16 species. Simulating multiple extinction scenarios, we found that richness strongly increased stand-level productivity. After 8 years, 16-species mixtures had accumulated over twice the amount of carbon found in average monocultures and similar amounts as those of two commercial monocultures. Species richness effects were strongly associated with functional and phylogenetic diversity. A shrub addition treatment reduced tree productivity, but this reduction was smaller at high shrub species richness. Our results encourage multispecies afforestation strategies to restore biodiversity and mitigate climate change.

Beschreibung: The prevention of autoimmunity requires the elimination of self-reactive T cells during their development and maturation. The expression of diverse self-antigens by stromal cells in the thymus is essential to this process and depends, in part, on the activity of the autoimmune regulator (Aire) gene. Here we report the identification of extrathymic Aire-expressing cells (eTACs) resident within the secondary lymphoid organs. These stromally derived eTACs express a diverse array of distinct self-antigens and are capable of interacting with and deleting naive autoreactive T cells. Using two-photon microscopy, we observed stable antigen-specific interactions between eTACs and autoreactive T cells. We propose that such a secondary network of self-antigen-expressing stromal cells may help reinforce immune tolerance by preventing the maturation of autoreactive T cells that escape thymic negative selection.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2532844/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2532844/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gardner, James M -- Devoss, Jason J -- Friedman, Rachel S -- Wong, David J -- Tan, Ying X -- Zhou, Xuyu -- Johannes, Kellsey P -- Su, Maureen A -- Chang, Howard Y -- Krummel, Matthew F -- Anderson, Mark S -- K08 AI076429/AI/NIAID NIH HHS/ -- K08 AI076429-05/AI/NIAID NIH HHS/ -- P01 AI035297/AI/NIAID NIH HHS/ -- P01 AI035297-150009/AI/NIAID NIH HHS/ -- P01 AI035297-159001/AI/NIAID NIH HHS/ -- P01 AI035297-160009/AI/NIAID NIH HHS/ -- P01 AI035297-169001/AI/NIAID NIH HHS/ -- P01 AI035297-170009/AI/NIAID NIH HHS/ -- P01 AI035297-179001/AI/NIAID NIH HHS/ -- P30 DK063720/DK/NIDDK NIH HHS/ -- P30 DK063720-05/DK/NIDDK NIH HHS/ -- T32 GM007618/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2008 Aug 8;321(5890):843-7. doi: 10.1126/science.1159407.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Diabetes Center, University of California San Francisco (UCSF), San Francisco, CA 94122, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18687966" target="_blank"〉PubMed〈/a〉

Beschreibung: The neocortex contains excitatory neurons and inhibitory interneurons. Clones of neocortical excitatory neurons originating from the same progenitor cell are spatially organized and contribute to the formation of functional microcircuits. In contrast, relatively little is known about the production and organization of neocortical inhibitory interneurons. We found that neocortical inhibitory interneurons were produced as spatially organized clonal units in the developing ventral telencephalon. Furthermore, clonally related interneurons did not randomly disperse but formed spatially isolated clusters in the neocortex. Individual clonal clusters consisting of interneurons expressing the same or distinct neurochemical markers exhibited clear vertical or horizontal organization. These results suggest that the lineage relationship plays a pivotal role in the organization of inhibitory interneurons in the neocortex.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3304494/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3304494/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brown, Keith N -- Chen, She -- Han, Zhi -- Lu, Chun-Hui -- Tan, Xin -- Zhang, Xin-Jun -- Ding, Liya -- Lopez-Cruz, Alejandro -- Saur, Dieter -- Anderson, Stewart A -- Huang, Kun -- Shi, Song-Hai -- K02MH070031/MH/NIMH NIH HHS/ -- R01 DA024681/DA/NIDA NIH HHS/ -- R01 DA024681-01A1/DA/NIDA NIH HHS/ -- R01 DA024681-02/DA/NIDA NIH HHS/ -- R01 DA024681-03/DA/NIDA NIH HHS/ -- R01 DA024681-04/DA/NIDA NIH HHS/ -- R01 DA024681-05/DA/NIDA NIH HHS/ -- R01DA024681/DA/NIDA NIH HHS/ -- R01MH066912/MH/NIMH NIH HHS/ -- R21 MH083624/MH/NIMH NIH HHS/ -- R21 MH083624-01/MH/NIMH NIH HHS/ -- R21 MH083624-02/MH/NIMH NIH HHS/ -- R21 NS072483/NS/NINDS NIH HHS/ -- R21 NS072483-01/NS/NINDS NIH HHS/ -- R21 NS072483-02/NS/NINDS NIH HHS/ -- R21MH083624/MH/NIMH NIH HHS/ -- R21NS072483/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2011 Oct 28;334(6055):480-6. doi: 10.1126/science.1208884.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Developmental Biology Program, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22034427" target="_blank"〉PubMed〈/a〉

Beschreibung: Insects are the most speciose group of animals, but the phylogenetic relationships of many major lineages remain unresolved. We inferred the phylogeny of insects from 1478 protein-coding genes. Phylogenomic analyses of nucleotide and amino acid sequences, with site-specific nucleotide or domain-specific amino acid substitution models, produced statistically robust and congruent results resolving previously controversial phylogenetic relations hips. We dated the origin of insects to the Early Ordovician [~479 million years ago (Ma)], of insect flight to the Early Devonian (~406 Ma), of major extant lineages to the Mississippian (~345 Ma), and the major diversification of holometabolous insects to the Early Cretaceous. Our phylogenomic study provides a comprehensive reliable scaffold for future comparative analyses of evolutionary innovations among insects.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Misof, Bernhard -- Liu, Shanlin -- Meusemann, Karen -- Peters, Ralph S -- Donath, Alexander -- Mayer, Christoph -- Frandsen, Paul B -- Ware, Jessica -- Flouri, Tomas -- Beutel, Rolf G -- Niehuis, Oliver -- Petersen, Malte -- Izquierdo-Carrasco, Fernando -- Wappler, Torsten -- Rust, Jes -- Aberer, Andre J -- Aspock, Ulrike -- Aspock, Horst -- Bartel, Daniela -- Blanke, Alexander -- Berger, Simon -- Bohm, Alexander -- Buckley, Thomas R -- Calcott, Brett -- Chen, Junqing -- Friedrich, Frank -- Fukui, Makiko -- Fujita, Mari -- Greve, Carola -- Grobe, Peter -- Gu, Shengchang -- Huang, Ying -- Jermiin, Lars S -- Kawahara, Akito Y -- Krogmann, Lars -- Kubiak, Martin -- Lanfear, Robert -- Letsch, Harald -- Li, Yiyuan -- Li, Zhenyu -- Li, Jiguang -- Lu, Haorong -- Machida, Ryuichiro -- Mashimo, Yuta -- Kapli, Pashalia -- McKenna, Duane D -- Meng, Guanliang -- Nakagaki, Yasutaka -- Navarrete-Heredia, Jose Luis -- Ott, Michael -- Ou, Yanxiang -- Pass, Gunther -- Podsiadlowski, Lars -- Pohl, Hans -- von Reumont, Bjorn M -- Schutte, Kai -- Sekiya, Kaoru -- Shimizu, Shota -- Slipinski, Adam -- Stamatakis, Alexandros -- Song, Wenhui -- Su, Xu -- Szucsich, Nikolaus U -- Tan, Meihua -- Tan, Xuemei -- Tang, Min -- Tang, Jingbo -- Timelthaler, Gerald -- Tomizuka, Shigekazu -- Trautwein, Michelle -- Tong, Xiaoli -- Uchifune, Toshiki -- Walzl, Manfred G -- Wiegmann, Brian M -- Wilbrandt, Jeanne -- Wipfler, Benjamin -- Wong, Thomas K F -- Wu, Qiong -- Wu, Gengxiong -- Xie, Yinlong -- Yang, Shenzhou -- Yang, Qing -- Yeates, David K -- Yoshizawa, Kazunori -- Zhang, Qing -- Zhang, Rui -- Zhang, Wenwei -- Zhang, Yunhui -- Zhao, Jing -- Zhou, Chengran -- Zhou, Lili -- Ziesmann, Tanja -- Zou, Shijie -- Li, Yingrui -- Xu, Xun -- Zhang, Yong -- Yang, Huanming -- Wang, Jian -- Wang, Jun -- Kjer, Karl M -- Zhou, Xin -- New York, N.Y. -- Science. 2014 Nov 7;346(6210):763-7. doi: 10.1126/science.1257570. Epub 2014 Nov 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Zoologisches Forschungsmuseum Alexander Koenig (ZFMK)/Zentrum fur Molekulare Biodiversitatsforschung (ZMB), Bonn, Germany. xinzhou@genomics.cn b.misof.zfmk@uni-bonn.de kjer@aesop.rutgers.edu wangj@genomics.cn. ; China National GeneBank, BGI-Shenzhen, China. BGI-Shenzhen, China. ; Zoologisches Forschungsmuseum Alexander Koenig (ZFMK)/Zentrum fur Molekulare Biodiversitatsforschung (ZMB), Bonn, Germany. Australian National Insect Collection, Commonwealth Scientific and Industrial Research Organization (Australia) (CSIRO), National Research Collections Australia, Canberra, ACT, Australia. ; Abteilung Arthropoda, Zoologisches Forschungsmuseum Alexander Koenig (ZFMK), Bonn, Germany. ; Zoologisches Forschungsmuseum Alexander Koenig (ZFMK)/Zentrum fur Molekulare Biodiversitatsforschung (ZMB), Bonn, Germany. ; Department of Entomology, Rutgers University, New Brunswick, NJ 08854, USA. ; Department of Biological Sciences, Rutgers University, Newark, NJ 08854, USA. ; Scientific Computing, Heidelberg Institute for Theoretical Studies (HITS), Heidelberg, Germany. ; Institut fur Spezielle Zoologie und Evolutionsbiologie mit Phyletischem Museum Jena, FSU Jena, Germany. ; Steinmann-Institut, Bereich Palaontologie, Universitat Bonn, Germany. ; 2. Zoologische Abteilung (Insekten), Naturhistorisches Museum Wien, Vienna, Austria. Department of Integrative Zoology, Universitat Wien, Vienna, Austria. ; Institut fur Spezifische Prophylaxe und Tropenmedizin, Medizinische Parasitologie, Medizinische Universitat Wien (MUW), Vienna, Austria. ; Department of Integrative Zoology, Universitat Wien, Vienna, Austria. ; Zoologisches Forschungsmuseum Alexander Koenig (ZFMK)/Zentrum fur Molekulare Biodiversitatsforschung (ZMB), Bonn, Germany. Sugadaira Montane Research Center/Hexapod Comparative Embryology Laboratory, University of Tsukuba, Japan. ; Manaaki Whenua Landcare Research, Auckland, New Zealand. ; Center for Advanced Modeling, Emergency Medicine Department, Johns Hopkins University, Baltimore, MD 21209, USA. ; BGI-Shenzhen, China. ; Biozentrum Grindel und Zoologisches Museum, Universitat Hamburg, Hamburg, Germany. ; Evolutionary Morphology Laboratory, Graduate School of Science and Engineering, Ehime University, Japan. ; Sugadaira Montane Research Center/Hexapod Comparative Embryology Laboratory, University of Tsukuba, Japan. ; Land and Water Flagship, CSIRO, Canberra, ACT, Australia. ; Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, USA. ; Entomology, Staatliches Museum fur Naturkunde Stuttgart (SMNS), Germany. ; Ecology Evolution and Genetics, Research School of Biology, Australian National University, Canberra, ACT, Australia. National Evolutionary Synthesis Center, Durham, NC 27705, USA. Department of Biological Sciences, Macquarie University, Sydney, Australia. ; Department fur Botanik und Biodiversitatsforschung, Universitat Wien, Vienna, Austria. ; Scientific Computing, Heidelberg Institute for Theoretical Studies (HITS), Heidelberg, Germany. Natural History Museum of Crete, University of Crete, Post Office Box 2208, Gr-71409, Iraklio, and Biology Department, University of Crete, Iraklio, Crete, Greece. ; Department of Biological Sciences and Feinstone Center for Genomic Research, University of Memphis, Memphis, TN 38152, USA. ; Centro Universitario de Ciencias Biologicas y Agropecuarias, Centro de Estudios en Zoologia, Universidad de Guadalajara, Zapopan, Jalisco, Mexico. ; Leibniz Supercomputing Centre of the Bavarian Academy of Sciences and Humanities, Garching, Germany. ; Institute of Evolutionary Biology and Ecology, Zoology and Evolutionary Biology, University of Bonn, Bonn, Germany. ; Department of Life Sciences, The Natural History Museum London, London, UK. ; Abteilung Entomologie, Biozentrum Grindel und Zoologisches Museum, Universitat Hamburg, Hamburg, Germany. ; Australian National Insect Collection, Commonwealth Scientific and Industrial Research Organization (Australia) (CSIRO), National Research Collections Australia, Canberra, ACT, Australia. ; Scientific Computing, Heidelberg Institute for Theoretical Studies (HITS), Heidelberg, Germany. Fakultat fur Informatik, Karlsruher Institut fur Technologie, Karlsruhe, Germany. ; California Academy of Sciences, San Francisco, CA 94118, USA. ; Department of Entomology, College of Natural Resources and Environment, South China Agricultural University, China. ; Sugadaira Montane Research Center/Hexapod Comparative Embryology Laboratory, University of Tsukuba, Japan. Yokosuka City Museum, Yokosuka, Kanagawa, Japan. ; Department of Entomology, North Carolina State University, Raleigh, NC 27695, USA. ; Systematic Entomology, Hokkaido University, Sapporo, Japan. ; BGI-Shenzhen, China. Department of Biology, University of Copenhagen, Copenhagen, Denmark. Princess Al Jawhara Center of Excellence in the Research of Hereditary Disorders, King Abdulaziz University, Jeddah, Saudi Arabia. Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau, China. Department of Medicine, University of Hong Kong, Hong Kong. xinzhou@genomics.cn b.misof.zfmk@uni-bonn.de kjer@aesop.rutgers.edu wangj@genomics.cn. ; Department of Ecology, Evolution, and Natural Resources, Rutgers University, New Brunswick, NJ 08854, USA. xinzhou@genomics.cn b.misof.zfmk@uni-bonn.de kjer@aesop.rutgers.edu wangj@genomics.cn. ; China National GeneBank, BGI-Shenzhen, China. BGI-Shenzhen, China. xinzhou@genomics.cn b.misof.zfmk@uni-bonn.de kjer@aesop.rutgers.edu wangj@genomics.cn.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25378627" target="_blank"〉PubMed〈/a〉

Beschreibung: Cycloaddition is an essential tool in chemical synthesis. Instead of using light or heat as a driving force, marine sponges promote cycloaddition with a more versatile but poorly understood mechanism in producing pyrrole-imidazole alkaloids sceptrin, massadine, and ageliferin. Through de novo synthesis of sceptrin and massadine, we show that sponges may use single-electron oxidation as a central mechanism to promote three different types of cycloaddition. Additionally, we provide surprising evidence that, in contrast to previous reports, sceptrin, massadine, and ageliferin have mismatched chirality. Therefore, massadine cannot be an oxidative rearrangement product of sceptrin or ageliferin, as is commonly believed. Taken together, our results demonstrate unconventional chemical approaches to achieving cycloaddition reactions in synthesis and uncover enantiodivergence as a new biosynthetic paradigm for natural products.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4205478/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4205478/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ma, Zhiqiang -- Wang, Xiaolei -- Wang, Xiao -- Rodriguez, Rodrigo A -- Moore, Curtis E -- Gao, Shuanhu -- Tan, Xianghui -- Ma, Yuyong -- Rheingold, Arnold L -- Baran, Phil S -- Chen, Chuo -- R01 GM073949/GM/NIGMS NIH HHS/ -- R01 GM079554/GM/NIGMS NIH HHS/ -- R01-GM073949/GM/NIGMS NIH HHS/ -- R01-GM079554/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2014 Oct 10;346(6206):219-24. doi: 10.1126/science.1255677.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA. ; Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA. ; Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA. ; Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA. chuo.chen@utsouthwestern.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25301624" target="_blank"〉PubMed〈/a〉

Beschreibung: Sherman et al. commented on the precedence of enantiodivergence, listing a number of congeneric natural products with opposite chirality. However, these "congeners" are not derived from enantiodivergent biosyntheses. Instead, they are antipodes arising from separate enantiomeric biosyntheses. A distinct feature of the biosynthesis of the cyclic pyrrole-imidazole dimers is the production of antipodal congeners without the corresponding enantiomers.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4536548/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4536548/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ma, Zhiqiang -- Wang, Xiaolei -- Wang, Xiao -- Rodriguez, Rodrigo A -- Moore, Curtis E -- Gao, Shuanhu -- Tan, Xianghui -- Ma, Yuyong -- Rheingold, Arnold L -- Baran, Phil S -- Chen, Chuo -- R01 GM073949/GM/NIGMS NIH HHS/ -- R01 GM079554/GM/NIGMS NIH HHS/ -- R01-GM073949/GM/NIGMS NIH HHS/ -- R01-GM079554/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2015 Jul 10;349(6244):149. doi: 10.1126/science.aaa9626. Epub 2015 Jul 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA. chuo.chen@utsouthwestern.edu. ; Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA. ; Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA. ; Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26160939" target="_blank"〉PubMed〈/a〉

Beschreibung: Femtosecond resolution electron scattering techniques are applied to resolve the first atomic-scale steps following absorption of a photon in the prototypical hybrid perovskite methylammonium lead iodide. Following above-gap photoexcitation, we directly resolve the transfer of energy from hot carriers to the lattice by recording changes in the mean square atomic displacements on 10-ps time scales. Measurements of the time-dependent pair distribution function show an unexpected broadening of the iodine-iodine correlation function while preserving the Pb–I distance. This indicates the formation of a rotationally disordered halide octahedral structure developing on picosecond time scales. This work shows the important role of light-induced structural deformations within the inorganic sublattice in elucidating the unique optoelectronic functionality exhibited by hybrid perovskites and provides new understanding of hot carrier—lattice interactions, which fundamentally determine solar cell efficiencies.

Beschreibung: 〈p〉Modern-day computers rely on electrical signaling for the processing and storage of data, which is bandwidth-limited and power hungry. This fact has long been realized in the communications field, where optical signaling is the norm. However, exploiting optical signaling in computing will require new on-chip devices that work seamlessly in both electrical and optical domains, without the need for repeated electrical-to-optical conversion. Phase-change devices can, in principle, provide such dual electrical-optical operation, but assimilating both functionalities into a single device has so far proved elusive owing to conflicting requirements of size-limited electrical switching and diffraction-limited optical response. Here, we combine plasmonics, photonics, and electronics to deliver an integrated phase-change memory cell that can be electrically or optically switched between binary or multilevel states. Crucially, this device can also be simultaneously read out both optically and electrically, offering a new strategy for merging computing and communications technologies.〈/p〉

Beschreibung: Searching for heavy fermion (HF) states in non–f-electron systems becomes an interesting issue, especially in the presence of magnetism, and can help explain the physics of complex compounds. Using angle-resolved photoemission spectroscopy, scanning tunneling microscopy, physical properties measurements, and the first-principles calculations, we observe the HF state in a 3d-electron van der Waals ferromagnet, Fe 3 GeTe 2 . Upon entering the ferromagnetic state, a massive spectral weight transfer occurs, which results from the exchange splitting. Meanwhile, the Fermi surface volume and effective electron mass are both enhanced. When the temperature drops below a characteristic temperature T *, heavy electrons gradually emerge with further enhanced effective electron mass. The coexistence of ferromagnetism and HF state can be well interpreted by the dual properties (itinerant and localized) of 3d electrons. This work expands the limit of ferromagnetic HF materials from f- to d-electron systems and illustrates the positive correlation between ferromagnetism and HF state in the 3d-electron material, which is quite different from the f-electron systems.