Search results for " barrier"
showing 10 items of 540 documents
Acculturation and oral health status among Tibetan immigrants residing in Bangalore City, India
2011
Background: This study is the first of its kind conducted among Tibetans immigrants to Bangalore City, India to study the effects of acculturation on the oral health outcomes of less established group of individuals. Objectives: To determine the Acculturation and oral health status among Tibetan immigrants in Bangalore city and to assess the relationship between them. Materials and Methods: A random sample of 560 immigrants aged 18 years and above from different Tibetan centre of Bangalore city were included for the study. Acculturation was measured using modified Psychological-behavioral acculturation scale. Dental caries experience and periodontal status were recorded. Results: 49.1% of f…
How Bad is Globalization for Labour Standards in the North?
2010
We analyse a world consisting of "the North" and "the South" where labour standards in the North are set by trade unions. Standards set by unions tend to increase output and welfare. There are no unions in the South and work standards are suboptimal. Trade between these two countries can imply a reduction in work standards in the North. Moreover, when trade unions are established in the South, the North, including northern unions, tend to lose. Quantitatively, these effects are small and overcompensated by gains in the South. The existing empirical literature tends to support our findings.
The Complementary Membranes Forming the Blood-Brain Barrier
2002
Brain capillary endothelial cells form the blood-brain barrier. They are connected by extensive tight junctions, and are polarized into luminal (blood-facing) and abluminal (brain-facing) plasma membrane domains. The polar distribution of transport proteins allows for active regulation of brain extracellular fluid. Experiments on isolated membrane vesicles from capillary endothelial cells of bovine brain demonstrated the polar arrangement of amino acid and glucose transporters, and the utility of such arrangements have been proposed. For instance, passive carriers for glutamine and glutamate have been found only in the luminal membrane of blood-brain barrier cells, while Na-dependent second…
Structure of the Blood–Brain Barrier and Its Role in the Transport of Amino Acids
2005
Brain capillary endothelial cells form the blood-brain barrier (BBB). They are connected by extensive tight junctions, and are polarized into luminal (blood-facing) and abluminal (brain-facing) plasma membrane domains. The polar distribution of transport proteins mediates amino acid (AA) homeostasis in the brain. The existence of two facilitative transporters for neutral amino acids (NAAs) on both membranes provides the brain access to essential AAs. Four Na(+)-dependent transporters of NAA exist in the abluminal membranes of the BBB. Together these systems have the capability to actively transfer every naturally occurring NAA from the extracellular fluid (ECF) to endothelial cells and from…
Mannitol in Amanita muscaria – An osmotic blood–brain barrier disruptor enhancing its hallucinogenic action?
2013
Hypothesis have been made that relatively high level of mannitol present in the tissues of fly agaric (Amanita muscaria) enables more efficient transportation of these active substances into the brain and thus enhance their total activity. It may have been supported by the fact that hallucinogenic effect after A. muscaria consumption is greater than after ingestion of an active substance quantity which the eaten fungi dose contain.
Facilitators and barriers HPV unvaccinated girls after 5 years of program implementation
2014
Understanding perceptions and characteristics of human papillomavirus (HPV) vaccinated and non-vaccinated girls can inform communication activities and vaccine delivery strategies. The purpose of this study was to evaluate knowledge and factors associated with HPV unvaccinated girls after five years of vaccination program implementation in Sicily, an Italian region with low vaccination coverage (<50.0%). A cross-sectional study was conducted through a questionnaire designed to assess knowledge and vaccination status of girls of 1997, 1998, 1999, and 2000 birth cohorts. The sample consisted of 350 girls who attended three high schools. Multivariable logistic regression analysis was conducted…
Selective properties of neutron transfer reactions in the 90Zr + 208Pb system for the population of excited states in zirconium isotopes
2015
Abstract Nuclei produced via multineutron transfer channels have been studied in 90 Zr + 208 Pb close to the Coulomb barrier energy in a fragment- γ coincident measurement employing the PRISMA magnetic spectrometer coupled to the CLARA γ -array. The selective properties of the reaction mechanism have been discussed in terms of states and their strength excited in the neutron transfer channels leading to 89–94 Zr isotopes. A strong population of yrast states, with energies up to ∼7.5 MeV has been observed.
A theoretical and experimental study of the racemization process of hexaaza[5]helicenes
2014
A dynamic 1H NMR study, together with DFT calculations, of bis-([1,2,3]triazolo)[1,5-a:5′,1′-k][1,10]phenanthroline 2 has allowed to identify the ring and open forms of a new example of ring/chain tautomerism, as well as their interconversion barriers (ring/ring and ring/open). The barrier of the exchange process between the chain forms and the ring form was found higher than the 'racemization' process in the closed form, so the ring opening does not contribute to the 'racemization'. The di-1,10-methyl and di-1,10-iodo derivatives have been prepared and their properties calculated.
Atmospheric pressure plasma polymerisation of metalloporphyrins containing mesoporous membranes for gas sensing applications
2013
Abstract Metalloporphyrins are embedded in an organosilicon matrix by an easily up-scalable atmospheric pressure dielectric barrier discharge method. The integrity of the metalloporphyrins, followed by UV–visible spectroscopy, is successfully preserved and their aggregation prevented. The single molecule properties, rather than the bulk ones, are thus enhanced. Exposure to triethylamine, which reaches the metalloporphyrins through the pores of the organosilicon membrane, led to a shift in the absorption spectrum and confirms the gas sensing potential of such coatings.
Investment and growth in Europe during the Golden Age
2009
During the ‘Golden Age’, the high investment rates reached by the European countries have been considered crucial in explaining growth. The literature about the Golden Age has emphasized supply-side explanations based on structural change, the reconstruction effort and the catch-up hypothesis, but also demand-side explanations focused on the effects of demand stability for promoting high rates of investment. In this article we have focused our attention on the evolution of the user cost of capital for explaining the high rates of investment. Our hypothesis is that the increase in investment rates was propelled by the decline in the user cost of capital, the consequence largely of the drop i…