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

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    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

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    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

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    Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/137588/1/ijpo12044.pd

    Pioneering Women of American Architecture

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    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]

    Correlation effects and orbital magnetism of Co clusters

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    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

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    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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