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13,228 result(s) for "Atlases."
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Spatialatemporal atlas of human fetal brain development during the early second trimester
During the second trimester, the human fetal brain undergoes numerous changes that lead to substantial variation in the neonatal in terms of its morphology and tissue types. As fetal MRI is more and more widely used for studying the human brain development during this period, a spatiotemporal atlas becomes necessary for characterizing the dynamic structural changes. In this study, 34 postmortem human fetal brains with gestational ages ranging from 15 to 22 weeks were scanned using 7.0 T MR. We used automated morphometrics, tensor-based morphometry and surface modeling techniques to analyze the data. Spatiotemporal atlases of each week and the overall atlas covering the whole period with high resolution and contrast were created. These atlases were used for the analysis of age-specific shape changes during this period, including development of the cerebral wall, lateral ventricles, Sylvian fissure, and growth direction based on local surface measurements. Our findings indicate that growth of the subplate zone is especially striking and is the main cause for the lamination pattern changes. Changes in the cortex around Sylvian fissure demonstrate that cortical growth may be one of the mechanisms for gyration. Surface deformation mapping, revealed by local shape analysis, indicates that there is global anterioraposterior growth pattern, with frontal and temporal lobes developing relatively quickly during this period. Our results are valuable for understanding the normal brain development trajectories and anatomical characteristics. These week-by-week fetal brain atlases can be used as reference in in vivo studies, and may facilitate the quantification of fetal brain development across space and time.
The Times comprehensive atlas of the world
The world's leading atlas makers bring you the \"greatest book on earth\". Renowned for charting geopolitical and geographical developments in our ever-changing world; Relied on and trusted by governments, media companies and international organizations including the UN and the European Commission; Continues to be the benchmark of cartographic excellence, from the pioneers in atlas publishing. Explore over 320 pages of maps and beautiful illustrations. Discover the scale of the world unconstrained by the limits of a screen. Keep up to date with current issues including climate change and biodiversity. New features include a double page map of the Arctic Ocean, new maps of sub-ice features in the Arctic Ocean and the Antarctic, and physical maps of all the continents. Major updates include 5,000 place name changes, most notably in Iran, Japan, Brazil, South Korea, Taiwan, and Spain; a beautifully illustrated section on current issues from climate to economy; updated national parks and conserved areas including the Kavango Zambezi Transfrontier Conservation Area (KAZA TFCA), the largest conservation zone in the world; and towns and populations in Brazil and Japan. Other updates include the realignment of the international boundary between Burkina Faso and Niger resulting from the International Court of Justice decision; the addition of Brussel as an alternative local name form for Brussels as the city is officially bilingual -- now shown as Brussel/Bruxelles; new administrative structures in Burkina Faso, Cote d'Ivoire, Democratic Republic of the Congo, and Madagascar; and the addition of more than 50 major waterfalls. - Publisher.
Atlas-based analysis of resting-state functional connectivity: Evaluation for reproducibility and multi-modal anatomyafunction correlation studies
Resting state functional connectivity MRI (rsfc-MRI) reveals a wealth of information about the functional organization of the brain, but poses unique challenges for quantitative image analysis, mostly related to the large number of voxels with low signal-to-noise ratios. In this study, we tested the idea of using a prior spatial parcellation of the entire brain into various structural units, to perform an analysis on a structure-by-structure, rather than voxel-by-voxel, basis. This analysis, based upon atlas parcels, potentially offers enhanced SNR and reproducibility, and can be used as a common anatomical framework for cross-modality and cross-subject quantitative analysis. We used Large Deformation Diffeomorphic Metric Mapping (LDDMM) and a deformable brain atlas to parcel each brain into 185 regions. To investigate the precision of the cross-subject analysis, we computed inter-parcel correlations in 20 participants, each of whom was scanned twice, as well as the consistency of the connectivity patterns inter- and intra-subject, and the intersession reproducibility. We report significant inter-parcel correlations consistent with previous findings, and high testaretest reliability, an important consideration when the goal is to compare clinical populations. As an example of the cross-modality analysis, correlation with anatomical connectivity is also examined.
Student atlas
Maps, illustrations, and text describe various aspects of countries of the world, including physical features, population, standards of living, natural resources, industries, environmental issues, and climate.
Fine-grain atlases of functional modes for fMRI analysis
Population imaging markedly increased the size of functional-imaging datasets, shedding new light on the neural basis of inter-individual differences. Analyzing these large data entails new scalability challenges, computational and statistical. For this reason, brain images are typically summarized in a few signals, for instance reducing voxel-level measures with brain atlases or functional modes. A good choice of the corresponding brain networks is important, as most data analyses start from these reduced signals. We contribute finely-resolved atlases of functional modes, comprising from 64 to 1024 networks. These dictionaries of functional modes (DiFuMo) are trained on millions of fMRI functional brain volumes of total size 2.4 ​TB, spanned over 27 studies and many research groups. We demonstrate the benefits of extracting reduced signals on our fine-grain atlases for many classic functional data analysis pipelines: stimuli decoding from 12,334 brain responses, standard GLM analysis of fMRI across sessions and individuals, extraction of resting-state functional-connectomes biomarkers for 2500 individuals, data compression and meta-analysis over more than 15,000 statistical maps. In each of these analysis scenarii, we compare the performance of our functional atlases with that of other popular references, and to a simple voxel-level analysis. Results highlight the importance of using high-dimensional “soft” functional atlases, to represent and analyze brain activity while capturing its functional gradients. Analyses on high-dimensional modes achieve similar statistical performance as at the voxel level, but with much reduced computational cost and higher interpretability. In addition to making them available, we provide meaningful names for these modes, based on their anatomical location. It will facilitate reporting of results. •We contribute finely-resolved high-dimensional functional modes for fMRI analysis.•Those are trained on millions of varied fMRI functional brain volumes, using a sparse matrix factorisation algorithm. The total training size is 2.4TB.•These Dictionaries of Functional Modes (DiFuMo) are multi-scale, with a number of functional networks ranging from 64 to 1024.•Our benchmarks reveal the importance of using high-dimensional “soft” continuous-valued functional atlases when extracting image-derived phenotypes.•We provide an anatomical name to each of the modes of the DiFuMo atlases. Those are available at https://parietal-inria.github.io/DiFuMo/.
Where on Earth? : atlas
A series of maps provide a continent-by-continent tour of the world, depicting such things as where the world's largest butterfly lives and which international border is crossed more than any other.
A global atlas of the dominant bacteria found in soil
Soil bacteria play key roles in regulating terrestrial carbon dynamics, nutrient cycles, and plant productivity. However, the natural histories and distributions of these organisms remain largely undocumented. Delgado-Baquerizo et al. provide a survey of the dominant bacterial taxa found around the world. In soil collections from six continents, they found that only 2% of bacterial taxa account for nearly half of the soil bacterial communities across the globe. These dominant taxa could be clustered into ecological groups of co-occurring bacteria that share habitat preferences. The findings will allow for a more predictive understanding of soil bacterial diversity and distribution. Science , this issue p. 320 Relatively few soil bacterial taxa dominate terrestrial ecosystems worldwide, with predictable distributions and ecology. The immense diversity of soil bacterial communities has stymied efforts to characterize individual taxa and document their global distributions. We analyzed soils from 237 locations across six continents and found that only 2% of bacterial phylotypes (~500 phylotypes) consistently accounted for almost half of the soil bacterial communities worldwide. Despite the overwhelming diversity of bacterial communities, relatively few bacterial taxa are abundant in soils globally. We clustered these dominant taxa into ecological groups to build the first global atlas of soil bacterial taxa. Our study narrows down the immense number of bacterial taxa to a “most wanted” list that will be fruitful targets for genomic and cultivation-based efforts aimed at improving our understanding of soil microbes and their contributions to ecosystem functioning.
Atlas of mammalian chromosomes
THE UPDATED NEW EDITION OF THE POPULAR COLLECTION OF HIGH-RESOLUTION CHROMOSOME PHOTOGRAPHS—FOR GENETICISTS, MAMMOLOGISTS, AND BIOLOGISTS INTERESTED IN COMPARATIVE GENOMICS, SYSTEMATICS, AND CHROMOSOME STRUCTURE Filled with a visually exquisite collection of the banded metaphase chromosome karyotypes from some 1, 000 species of mammals, the Atlas of Mammalian Chromosomes offers an unabridged compendium of the state of this genomic art form. The Atlas??contains the best karyotype produced, the common and Latin name of the species, the published citation, and identifies the contributing authors. Nearly all karyotypes are G-banded, revealing the chromosomal bar codes of homologous segments among related species. The Atlas brings together information from a range of cytogenetic literature and features high-quality karyotype images for nearly every mammal studied to date. When the Atlas was first published, only three mammals were sequenced. Today, that number is over 300. Now in its second edition, this book contains extensive revisions and major additions such as new karyotypes that employ G- and C- banding to represent euchromatin and heterochromatin genome composition, new phylogenetic trees for each order, homology segment chromosome information on published aligned chromosome painting. Summaries of the painting data for some species indicate conserved homology segments among compared species. An invaluable resource for today's comparative genomics era, this comprehensive collection of high-resolution chromosome photographs: * Assembles information previously scattered throughout the cytogenetics literature in one comprehensive volume * Provides chromosome information and illustrations for the karyotypes of 300 new species * Addresses the mandate of the Human Genome Project to annotate the genomes of other organisms * Serves as a basis for chromosome-level genome assemblies * Offers a detailed summation of three decades of ZooFish (chromosome painting) * Presents high-resolution photos of karyotypes that represent more than 1, 000 mammal species Written for geneticists, mammalogists, and biologists, the Atlas of Mammalian Chromosomes offers a step forward for an understanding of species formation, of genome organization, and of DNA script for natural selection.