Results 211 to 220 of about 667,124 (235)

Region‐to‐Region Unidirectional Connection In Vitro Brain Model for Studying Directional Propagation of Neuropathologies

Advanced Functional Materials, EarlyView.
A unidirectional cerebral organoid–organoid neural circuit is established using a microfluidic platform, enabling controlled directional propagation of electrical signals, neuroinflammatory cues, and neurodegenerative disease–related proteins between spatially separated organoids.
Kyeong Seob Hwang, Hui‐Wen Liu, Hyogeun Shin, Hyun Wook Kang, Minjin Kang, Jongbaeg Kim, Il‐Joo Cho, Nakwon Choi, Seok Chung, Hong Nam Kim   +9 more
wiley   +1 more source

Multiscale Structuring of Hydroxyapatite via Two‐Photon Lithography of Nanocomposites

Advanced Functional Materials, EarlyView.
Hydroxyapatite scaffolds are of great interest in bone tissue engineering applications, ranging from 3D cell culture to regenerative medicine. Using two‐photon lithography of a transparent nanocomposite, hydroxyapatite microstructures with features ranging from submicron to centimeter‐scale are fabricated. This allows to mimic the natural bone geometry,
Leonhard Hambitzer, Jan Mathis Hornbostel, Richard Prediger, Sebastian Kluck, Michael Daub, Cornelia Lee‐Thedieck, Frederik Kotz‐Helmer   +6 more
wiley   +1 more source

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Beta Diversity in Tropical Forests

Science, 2002
STRI
Duivenvoorden, J.F., Svenning, C-C., Wright, S.J.   +2 more
  +9 more sources

Beta diversity reconsidered

Ecological Research, 2013
Abstract A simple analytical procedure to test for differences in beta diversity among sets of plots has been recently presented. Here, we describe an improved randomization procedure that replaces the one previously proposed. This procedure consists of shuffling within‐group dissimilarities among groups and disregarding between‐group
Giovanni Bacaro, Margherita Gioria, RICOTTA, Carlo   +2 more
openaire   +4 more sources

Measuring beta‐diversity from taxonomic similarity

Journal of Vegetation Science, 2007
AbstractQuestion: The utility of beta (β‐) diversity measures that incorporate information about the degree of taxonomic (dis)similarity between species plots is becoming increasingly recognized. In this framework, the question for this study is: can we define an ecologically meaningful index of β‐diversity that, besides indicating simple species ...
Giovanni Bacaro, RICOTTA, Carlo, Stefano Mazzoleni   +2 more
openaire   +4 more sources

Beta-Diversity in Tropical Forest Trees

Science, 2002
The high alpha-diversity of tropical forests has been amply documented, but beta-diversity—how species composition changes with distance—has seldom been studied. We present quantitative estimates of beta-diversity for tropical trees by comparing species composition of plots in lowland terra firme forest in Panama, Ecuador, and Peru.
Condit, Richard S., Pitman, Nigel C. A., Leigh, Egbert Giles, Jr., Chave, Jerome, Terborgh, John W., Foster, Robin B., Nunez Vargas, Percy, Aguilar, Salomo´n, Valencia, Renato, Villa Munoz, Gorky, Muller-Landau, Helene C., Losos, Elizabeth Claire, Hubbell, Stephen P.   +12 more
openaire   +2 more sources

Diversity of amyloid beta peptide actions

Reviews in the Neurosciences
Abstract Fibril formation by amyloidogenic proteins and peptides is considered the cause of a number of incurable diseases. One of the most known amyloid diseases is Alzheimer’s disease (AD). Traditionally, amyloidogenic beta peptides Aβ40 and Aβ42 (Aβs) are considered as main causes of AD and the foremost targets in AD fight.
Sona Mardanyan, Svetlana Sharoyan, Alvard Antonyan   +2 more
openaire   +2 more sources

Independence of alpha and beta diversities

Ecology, 2010
Denny, M., and S. Gaines. 2000. Chance in biology: using probability to explore nature. Princeton University Press, Princeton, New Jersey, USA. Jost, L. 2006. Entropy and diversity. Oikos 113:363-375. Jost, L. 2007. Partitioning diversity into independent alpha and beta components. Ecology 88:2427-2439. Quinn, G. P., and M. J. Keough.
openaire   +2 more sources

Quantifying evenness and linking it to diversity, beta diversity, and similarity

Ecology, 2019
AbstractAn enormous number of measures based on different criteria have been proposed to quantify evenness or unevenness among species relative abundances in an assemblage. However, a unified approach that can encompass most of the widely used indices is still lacking. Here, we first present some basic requirements for an evenness measure.
Anne Chao, Carlo Ricotta
openaire   +2 more sources

A review of beta diversity studies

Biodiversity Science, 2010
Beta diversity is an important component of biological diversity, measuring compositional change in species assemblages across temporal and spatial scales. Beta diversity concerns not only a number of ecological and evolutionary issues, but can also guide the selection of protected areas and help to optimize conservation networks.
Chen Shengbin, Ouyang Zhiyun, Xu Weihua, Xiao Yi   +3 more
openaire   +1 more source