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Federal University of Roraima
Education•
About: Federal University of Roraima is a based out in . It is known for research contribution in the topics: Population & Thermogravimetry. The organization has 981 authors who have published 1218 publications receiving 7849 citations. The organization is also known as: Federal University of Roraima.
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National Institute for Space Research1, Institut national de la recherche agronomique2, University of Antwerp3, University of Leeds4, University of Hohenheim5, Royal Museum for Central Africa6, National Institute of Amazonian Research7, Empresa Brasileira de Pesquisa Agropecuária8, University of Tasmania9, University of Erlangen-Nuremberg10, Wageningen University and Research Centre11, Universidade Federal do Acre12, Spanish National Research Council13, University of São Paulo14, Federal University of Paraná15, Universidade Federal de Juiz de Fora16, Paul Sabatier University17, University of Zambia18, University of Missouri–St. Louis19, Universidade Federal de Viçosa20, Centre national de la recherche scientifique21, Stellenbosch University22, Escola Superior de Agricultura Luiz de Queiroz23, Universidade Federal de Santa Maria24, University of Brasília25, World Agroforestry Centre26, Charles Darwin University27, Mount Holyoke College28, Stanford University29, University of Illinois at Urbana–Champaign30, University of Göttingen31, Universidade do Estado de Santa Catarina32, Malaysian Palm Oil Board33, Universidade Federal de Minas Gerais34, California State University, Monterey Bay35, Universidade Federal de Sergipe36, University of Helsinki37, University of Oxford38, United States Forest Service39, Florida International University40, Kyoto University41, Institut Français42, National Scientific and Technical Research Council43, Sao Paulo State University44, University of Edinburgh45, Oregon State University46, Brazilian Institute of Environment and Renewable Natural Resources47, Federal University of Roraima48, University of Aberdeen49, Universidade Federal do Amapá50, Universidad Autónoma Gabriel René Moreno51, State University of Campinas52
TL;DR: In this paper, the seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem.
Abstract: The seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem. Based on a unique combination of seasonal pan-tropical data sets from 89 experimental sites (68 include aboveground wood productivity measurements and 35 litter productivity measurements), their associate canopy photosynthetic capacity (enhanced vegetation index, EVI) and climate, we ask how carbon assimilation and aboveground allocation are related to climate seasonality in tropical forests and how they interact in the seasonal carbon cycle. We found that canopy photosynthetic capacity seasonality responds positively to precipitation when rainfall is < 2000 mm.yr−1 (water-limited forests) and to radiation otherwise (light-limited forests); on the other hand, independent of climate limitations, wood productivity and litterfall are driven by seasonal variation in precipitation and evapotranspiration respectively. Consequently, light-limited forests present an asynchronism between canopy photosynthetic capacity and wood productivity. Precipitation first-order control indicates an overall decrease in tropical forest productivity in a drier climate. (Resume d'auteur)
40 citations
TL;DR: Study of HPV in isolated hunter-gather peoples suggests that long-term persistence is a characteristic of prehistoric humans and patterns reflecting decreased prevalence with age in western society represents recent change.
Abstract: Objective
Indigenous women from the Amazon regions have some of the highest rates of cervical cancer in the world. This study evaluated cervical cytology and human papillomavirus (HPV) in native women that differ by lifestyle and interaction with western society. Yanomami women are isolated deep in the Amazon with a hunter/gatherer lifestyle. Macuxi and Wapishana women live in proximity to western society.
40 citations
TL;DR: The phase diagram of the nematic mesophases present in the tetradecyltrimethylammonuim bromide/ n-decanol/water system was determined in this paper.
Abstract: The phase diagram of the nematic mesophases present in the tetradecyltrimethylammonuim bromide/ n-decanol/water system was determined. Two distinct biaxial nematic mesophases with opposite diamagnetic and optical anisotropies were identified using 2 H NMR spectroscopy and optical microscopy with polarized light. Two nematic biaxial phases were observed in a very narrow region between the two uniaxial nematic mesophases. The sequence of phase changes, hexagonal-calamitic N C -biaxial N B X +-biaxial N B X --discotic N D -lamellar mesophases, was observed with increasing decanol content. The phase transition between the two biaxial mesophases is first order, while the phase transitions between the N C and N B X + and the N B X --N D mesophases are second order. The order parameters of the ionic headgroup of the surfactant, determined from the 2 H quadrupolar splittings, indicate that the average micelle size decreases with the decanol content in the N C and N B X + mesophases and increases with the decanol content in the N B X - and N D mesophases.
39 citations
TL;DR: A series of titanates and niobates, K2Ti4O9, Na2Ti3O7, KNb3O8, K4Nb6O17, and their respective acid forms were prepared and characterized by X-ray diffraction, thermogravimetry and scanning electron microscopy as discussed by the authors.
39 citations
TL;DR: In this article, the synthesis, characterization, and intercalation of n-alkyldiamines H 2 N(CH 2 ) n NH 2 (n = 2, 3, 4, 6, 7, and 8) into layered hydrous tetratitanic acid H 2 Ti 4 O 9 ·nH 2 O are reported.
39 citations
Authors
Showing all 984 results
| Name | H-index | Papers | Citations |
|---|---|---|---|
| A. Townsend Peterson | 91 | 521 | 51524 |
| Felipe Gomes Naveca | 25 | 97 | 2612 |
| Pablo Acosta | 23 | 91 | 3629 |
| Adrian Martin Pohlit | 21 | 69 | 1491 |
| Regina V. Oliveira | 20 | 48 | 1146 |
| Maria Goreti Rosa-Freitas | 20 | 34 | 990 |
| S. B. Legoas | 18 | 45 | 2150 |
| Luciano Nicolás Naka | 18 | 44 | 1415 |
| Rodrigo Rodrigues | 17 | 152 | 1128 |
| Robson F. de Farias | 16 | 86 | 925 |
| Adriana Flach | 15 | 34 | 642 |
| Regynaldo Arruda Sampaio | 15 | 128 | 1001 |
| Elizanilda Ramalho do Rêgo | 14 | 90 | 793 |
| Raynner Rilke Duarte Barboza | 14 | 41 | 977 |
| Fabiana Granja | 14 | 41 | 915 |