921 research outputs found
All Sites but Skin Cancer Incidences Analyzed Worldwide by Sex, Age, and Skin Type Over Time (1955-2007), Advancing Age, and UVB Dose Reveals Important Carcinogenic Drivers
Because we observed increasing incidences over time, advancing age, higher estrogen levels, decreasing UVB (290-315 nm) doses, or lower vitamin D3, and Human Papillomavirus hiding in immune-privileged sites of hair follicles play roles in melanoma, we wondered if the majority of cancers might have similar carcinogenic drivers. To investigate this possibility, we performed worldwide analysis of all sites but skin cancer over time (1955-2007), advancing age, and UVB doses for males and females with all skin types and ages (0-85+) and in five age groups using IARC data. To investigate Human Papillomavirus’s role, we analyzed the incidences of breast, prostate, and colon cancers in a developed country with European ancestry (New Zealand) having high amounts of androgenic hair and a developing country with Asian ancestry (India) having low amounts of androgenic hair. To potentially add epidemiology to the already established role of estrogen in cancer, we analyzed males and females in various countries around the world using the incidence of breast cancer (\u3e 70 yr.) as an established indicator of estrogen levels. The analysis reveals cancer incidences are steadily increasing over time in developed but not developing countries regardless of skin type. Only US white, but not black, breast, prostate, and colon cancer incidences in the oldest age group significantly decreased with increasing UVB dose suggesting a role for vitamin D3. The data suggests the carcinogenic drivers in many cancers are estrogen, increasing age (or reactive oxygen species), decreasing vitamin D3 levels, and persistence of Human Papillomavirus infection in immune-privileged sites
Nonconventional screening of the Coulomb interaction in FexOy clusters: An ab-initio study
From microscopic point-dipole model calculations of the screening of the
Coulomb interaction in non-polar systems by polarizable atoms, it is known that
screening strongly depends on dimensionality. For example, in one dimensional
systems the short range interaction is screened, while the long range
interaction is anti-screened. This anti-screening is also observed in some zero
dimensional structures, i.e. molecular systems. By means of ab-initio
calculations in conjunction with the random-phase approximation (RPA) within
the FLAPW method we study screening of the Coulomb interaction in FexOy
clusters. For completeness these results are compared with their bulk
counterpart magnetite. It appears that the onsite Coulomb interaction is very
well screened both in the clusters and bulk. On the other hand for the
intersite Coulomb interaction the important observation is made that it is
almost contant throughout the clusters, while for the bulk it is almost
completely screened. More precisely and interestingly, in the clusters
anti-screening is observed by means of ab-initio calculations
Food insecurity and dietary intake among US youth, 2007–2010
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/137588/1/ijpo12044.pd
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Youth ‘07 The health and wellbeing of secondary school students in New Zealand: Results for young people attracted to the same sex or both sexes.
Pioneering Women of American Architecture
Review of Pioneering Women of American Architecture , Reviewed June 2018 by Pioneering Women of American Architecture Anina E. Rossen, Independent Architectural Historian and Librarian [email protected]
ZNF804A genotype modulates neural activity during working memory for faces
Copyright © 2013 S. Karger AG, Basel.Peer reviewedPublisher PD
Correlation effects and orbital magnetism of Co clusters
Recent experiments on isolated Co clusters have shown huge orbital magnetic
moments in comparison with their bulk and surface counterparts. These clusters
hence provide the unique possibility to study the evolution of the orbital
magnetic moment with respect to the cluster size and how competing interactions
contribute to the quenching of orbital magnetism. We investigate here different
theoretical methods to calculate the spin and orbital moments of Co clusters,
and assess the performances of the methods in comparison with experiments. It
is shown that density functional theory in conventional local density or
generalized gradient approximations, or even with a hybrid functional, severely
underestimates the orbital moment. As natural extensions/corrections we
considered the orbital polarization correction, the LDA+U approximation as well
as the LDA+DMFT method. Our theory shows that of the considered methods, only
the LDA+DMFT method provides orbital moments in agreement with experiment, thus
emphasizing the importance of dynamic correlations effects for determining
fundamental magnetic properties of magnets in the nano-size regime
Quantum effective potential, electron transport and conformons in biopolymers
In the Kirchhoff model of a biopolymer, conformation dynamics can be
described in terms of solitary waves, for certain special cross-section
asymmetries. Applying this to the problem of electron transport, we show that
the quantum effective potential arising due to the bends and twists of the
polymer enables us to formalize and quantify the concept of a {\it conformon}
that has been hypothesized in biology. Its connection to the soliton solution
of the cubic nonlinear Schr\"{o}dinger equation emerges in a natural fashion.Comment: to appear in J. Phys.
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