Showing 181 - 190 of 2040 Items
Global divergence of the human follicle mite Demodex folliculorum: Persistent associations between host ancestry and mite lineages
Date: 2015-12-29
Creator: Michael F. Palopoli
Daniel J. Fergus
Samuel Minot
Dorothy T. Pei
W. Brian, Simison
Iria Fernandez-Silva
Megan S. Thoemmes
Robert R. Dunn
Michelle Trautwein
Access: Open access
- Microscopic mites of the genus Demodex live within the hair follicles of mammals and are ubiquitous symbionts of humans, but little molecular work has been done to understand their genetic diversity or transmission. Here we sampled mite DNA from 70 human hosts of diverse geographic ancestries and analyzed 241 sequences from the mitochondrial genome of the species Demodex folliculorum. Phylogenetic analyses recovered multiple deep lineages including a globally distributed lineage common among hosts of European ancestry and three lineages that primarily include hosts of Asian, African, and Latin American ancestry. To a great extent, the ancestral geography of hosts predicted the lineages of mites found on them; 27% of the total molecular variance segregated according to the regional ancestries of hosts. We found that D. folliculorum populations are stable on an individual over the course of years and that some Asian and African American hosts maintain specific mite lineages over the course of years or generations outside their geographic region of birth or ancestry. D. folliculorum haplotypes were much more likely to be shared within families and between spouses than between unrelated individuals, indicating that transmission requires close contact. Dating analyses indicated that D. folliculorum origins may predate modern humans. Overall, D. folliculorum evolution reflects ancient human population divergences, is consistent with an out-of-Africa dispersal hypothesis, and presents an excellent model system for further understanding the history of human movement.
Religion and science in the Eastern mediterranean
Date: 2016-09-01
Creator: Robert Morrison
Access: Open access
- “Science and Orthodox Christianity: An Overview” is an ambitious survey that reminds scholars of science in Islamic societies that the conversation between Islam and science is really a conversation between Islam and science in different contexts and that conversations between Islam and science can be found with less renowned scientific developments such as prophetic medicine. This response points out parallels in how Greek Orthodox and Ottoman Muslim scholars mediated new developments in Western European science and in how both Greek Orthodox and some Ottoman Muslim scholars propounded a mathematical humanism. Finally, it argues that the account of post-1453 scientific exchange is more complex than “Science and Orthodox Christianity” intimates. At the least, if there was no scholarly exchange between Greek Orthodox Christians, on the one hand, and, on the other hand, Muslims and Jews—who, in turn, enjoyed scholarly exchange with the West well after 1453—there are clearly two different Easts.
Civil Society under the Law ‘On Foreign Agents’: NGO Strategies and Network Transformation
Date: 2018-04-21
Creator: Maria Tysiachniouk
Svetlana Tulaeva
Laura A. Henry
Access: Open access
- This essay analyses how the ‘foreign agent’ law has been interpreted and implemented by the Russian authorities and examines diverse NGO survival strategies in response to the ‘foreign agent’ label. The foreign agent law has disrupted and transformed resource mobilisation strategies and transnational NGO networks. Based on qualitative research on environmental NGOs, we offer a typology of NGO responses to the foreign agent law, providing examples to show how the organisations attempt to ensure their survival.
The initiation and development of small peat-forming ecosystems adjacent to lakes in the north central Canadian low arctic during the Holocene
Date: 2017-07-01
Creator: Philip Camill
Charles E. Umbanhowar
Christoph Geiss
Mark B. Edlund
Will O., Hobbs
Allison Dupont
Catherine Doyle-Capitman
Matthew Ramos
Access: Open access
- Small peat-forming ecosystems in arctic landscapes may play a significant role in the regional biogeochemistry of high-latitude systems, yet they are understudied compared to arctic uplands and other major peat-forming regions of the North. We present a new data set of 25 radiocarbon-dated permafrost peat cores sampled around eight low arctic lake sites in northern Manitoba (Canada) to examine the timing of peat initiation and controls on peat accumulation throughout the Holocene. We used macrofossils and charcoal to characterize changes in the plant community and fire, and we explored potential impacts of these local factors, as well as regional climatic change, on rates of C accumulation and C stocks. Peat initiation was variable across and within sites, suggesting the influence of local topography, but 56% of the cores initiated after 3000 B.P. Most cores initiated and remained as drier bog hummock communities, with few vegetation transitions in this landscape. C accumulation was relatively slow and did not appear to be correlated with Holocene-scale climatic variability, but C stocks in this landscape were substantial (mean = 45.4 kg C m ), potentially accounting for 13.2 Pg C in the Taiga Shield ecozone. To the extent that small peat-forming systems are underrepresented in peatland mapping, soil organic carbon (SOC) stocks may be underestimated in arctic regions. Mean fire severity appeared to be negatively correlated with C accumulation rates. Initiation and accumulation of soil C may respond to both regional and local factors, and substantial lowland soil C stocks have the potential for biogeochemical impacts on adjacent aquatic ecosystems. −2
Conical wave propagation and diffraction in two-dimensional hexagonally packed granular lattices
Date: 2016-01-25
Creator: C. Chong
P. G. Kevrekidis
M. J. Ablowitz
Yi Ping Ma
Access: Open access
- Linear and nonlinear mechanisms for conical wave propagation in two-dimensional lattices are explored in the realm of phononic crystals. As a prototypical example, a statically compressed granular lattice of spherical particles arranged in a hexagonal packing configuration is analyzed. Upon identifying the dispersion relation of the underlying linear problem, the resulting diffraction properties are considered. Analysis both via a heuristic argument for the linear propagation of a wave packet and via asymptotic analysis leading to the derivation of a Dirac system suggests the occurrence of conical diffraction. This analysis is valid for strong precompression, i.e., near the linear regime. For weak precompression, conical wave propagation is still possible, but the resulting expanding circular wave front is of a nonoscillatory nature, resulting from the complex interplay among the discreteness, nonlinearity, and geometry of the packing. The transition between these two types of propagation is explored.
Stolen Future, Broken Present: The Human Significance of Climate Change
Date: 2014-01-01
Creator: David A Collings
Access: Open access
- This book argues that climate change has a devastating effect on how we think about the future. Once several positive feedback loops in Earth’s dynamic systems, such as the melting of the Arctic icecap or the drying of the Amazon, cross the point of no return, the biosphere is likely to undergo severe and irreversible warming. Nearly everything we do is premised on the assumption that the world we know will endure into the future and provide a sustaining context for our activities. But today the future of a viable biosphere, and thus the purpose of our present activities, is put into question. A disappearing future leads to a broken present, a strange incoherence in the feel of everyday life. We thus face the unprecedented challenge of salvaging a basis for our lives today. That basis, this book argues, may be found in our capacity to assume an infinite responsibility for ecological disaster and, like the biblical Job, to respond with awe to the alien voice that speaks from the whirlwind. By owning disaster and accepting our small place within the inhuman forces of the biosphere, we may discover how to live with responsibility and serenity whatever may come. (Publisher's Description) Freely available online at https://quod.lib.umich.edu/o/ohp/12832550.0001.001
Love is Real & I Just Had Some for Dessert: Legacies of Communal Care & Compassion in Asian Diasporic Women's Food Writing
Date: 2023-01-01
Creator: Miki Rierson
Access: Open access
- In this project I work to recover influential yet often erased Asian American female immigrant chefs and food authors from the mid-twentieth century to the present, situating their contributions in a deep-rooted tradition of diasporic women who used cooking as a means of communal agency and care. Immigrant Asian cookbook authors and chefs have long faced internal criticisms from their own diasporic communities of either inauthenticity or engaging in “food pornography,” to use writer Frank Chin’s term—a line of criticism that Lisa Lau has elaborated on as “re-Orientalism.”Though these criticisms should not eclipse the works themselves, I discuss and counter them in my project because they reflect broader challenges faced particularly by Asian female diasporic authors even today. , I seek to address a broader scholarly gap through my project. Presently, much important work exists on the legacies of historical trauma and violence on marginalized communities, work that highlights the insidious ways violence manifests in academia, pop culture, and everyday lives. This project is a personal pursuit to focus on the healing and beautiful aspects of diasporic community and identity, an ode to the parts of us that are not defined by the pain and suffering but that seek self-affirmation beyond them.
Music Streaming Services, Programming Culture, and the Politics of Listening
Date: 2015-05-01
Creator: Walker Kennedy
Access: Open access
Liberty and Its Legacy An Analysis of Freedom and Liberty in American Political Rhetoric
Date: 2023-01-01
Creator: Ryan S. Kovarovics
Access: Open access
- The concept of freedom has always been central to the American identity, but its meaning has never been agreed on by all and has long been the subject of debate. An abridged explanation of the evolution of liberty’s meaning in political thought and American history is presented in the first chapter of this project. It demonstrates the long-standing importance of individual freedom in America and highlights some historical moments when liberty has come into conflict with other societal values. When used in American political rhetoric today, “freedom” and “liberty” typically take on a “negative” meaning that is focused mostly on individual freedom from government intervention. This is especially clear with regard to issues each party claims to “own” in the context of freedom, including abortion for the Democrats and the covid-19 pandemic response for the Republicans. To verify this partisan ownership of freedom and compare how each party uses freedom in political rhetoric, an empirical analysis was conducted of the uses of “freedom” and “liberty” in candidate tweets and campaign ads from the 2022 midterm elections. The analysis found some support for partisan ownership of freedom rhetoric surrounding these and other issues, but the most interesting finding was that Democrats and Republicans invoked “freedom” and “liberty” in their rhetoric at virtually identical rates. This shows that neither party can lay an exclusive claim to be the “party of freedom.”
Electronic branching ratio of the lepton
Date: 1992-01-01
Creator: R. Ammar
P. Baringer
D. Coppage
R. Davis
M., Kelly
N. Kwak
H. Lam
S. Ro
Y. Kubota
M. Lattery
J. K. Nelson
D. Perticone
R. Poling
S. Schrenk
R. Wang
M. S. Alam
I. J. Kim
B. Nemati
V. Romero
C. R. Sun
P. N. Wang
M. M. Zoeller
G. Crawford
R. Fulton
K. K. Gan
H. Kagan
R. Kass
J. Lee
R. Malchow
F. Morrow
M. K. Sung
Access: Open access
- Using data accumulated by the CLEO I detector operating at the Cornell Electron Storage Ring, we have measured the ratio R=( e» e ) 1 where " 1 is the decay rate to final states with one charged particle. We find R=0.2231 0.0044 0.0073 where the first error is statistical and the second is systematic. Together with the measured topological one-charged-particle branching fraction, this yields the branching fraction of the lepton to electrons, Be=0.192 0.004 0.006. © 1992 The American Physical Society.