Search results for "75"
showing 10 items of 1365 documents
Plenty of big projections imply big pieces of Lipschitz graphs
2020
I prove that a closed $n$-regular set $E \subset \mathbb{R}^{d}$ with plenty of big projections has big pieces of Lipschitz graphs. This answers a question of David and Semmes.
Curve packing and modulus estimates
2018
A family of planar curves is called a Moser family if it contains an isometric copy of every rectifiable curve in $\mathbb{R}^{2}$ of length one. The classical "worm problem" of L. Moser from 1966 asks for the least area covered by the curves in any Moser family. In 1979, J. M. Marstrand proved that the answer is not zero: the union of curves in a Moser family has always area at least $c$ for some small absolute constant $c > 0$. We strengthen Marstrand's result by showing that for $p > 3$, the $p$-modulus of a Moser family of curves is at least $c_{p} > 0$.
Uniqueness of positive radial solutions to singular critical growth quasilinear elliptic equations
2015
In this paper, we prove that there exists at most one positive radial weak solution to the following quasilinear elliptic equation with singular critical growth \[ \begin{cases} -\Delta_{p}u-{\displaystyle \frac{\mu}{|x|^{p}}|u|^{p-2}u}{\displaystyle =\frac{|u|^{\frac{(N-s)p}{N-p}-2}u}{|x|^{s}}}+\lambda|u|^{p-2}u & \text{in }B,\\ u=0 & \text{on }\partial B, \end{cases} \] where $B$ is an open finite ball in $\mathbb{R}^{N}$ centered at the origin, $1<p<N$, $-\infty<\mu<((N-p)/p)^{p}$, $0\le s<p$ and $\lambda\in\mathbb{R}$. A related limiting problem is also considered.
Sistemas dopaminérgicos en el telencéfalo del ratón: Papel en el procesamiento de estímulos reforzantes naturales
2009
El refuerzo es un proceso psicológico complejo mediante el cual los animales modifican su comportamiento frente situaciones que les resultan ventajosas. Durante años se ha postulado que la dopamina (DA) liberada en el núcleo accumbens por neuronas tegmentales era el agente causal del refuerzo. Sin embargo, esta hipótesis es cada día más cuestionada y el refuerzo se subdivide en diversos procesos, sólo algunos de los cuales están relacionados con la DA. Utilizando el ratón como especie experimental, nos planteamos como objetivo comparar el papel de la DA en el refuerzo inducido por dos estímulos naturales diferentes. Utilizamos un reforzante ampliamente descrito, la sacarosa, frente un estím…
Análisis de las interacciones moleculares de la toxina Cry3Aa de Bacillus thuringiensis en la membrana del epitelio intestinal de Leptinotarsa deceml…
2011
Leptinotarsa decemlineata (escarabajo de la patata) es el insecto defoliador de patata de mayor importancia económica a nivel mundial, que también puede atacar otras plantas de interés económico como berenjena y tomate, y que ha desarrollado resistencia frente a un gran número de los insecticidas químicos utilizados para combatirlo. Las toxinas Cry de Bacillus thuringiensis, las cuales son altamente específicas para sus dianas e inocuas para los vertebrados, la gran mayoría de los invertebrados y las plantas, constituyen una herramienta de gran valor para el control de esta plaga, sin provocar efectos perjudiciales sobre el medio ambiente. En el presente trabajo hemos profundizado en el est…
Employment Is Associated with the Health-Related Quality of Life of Morbidly Obese Persons
2010
Published version of an article in the journal: Obesity Surgery. The original publication is available at Springerlink. http://dx.doi.org/10.1007/s11695-010-0289-6. Open Access Background We aimed to investigate whether employment status was associated with health-related quality of life (HRQoL) in a population of morbidly obese subjects. Methods A total of 143 treatment-seeking morbidly obese patients completed the Medical Outcome Study 36-Item Short-Form Health Survey (SF-36) and the Obesity and Weight-Loss Quality of Life (OWLQOL) questionnaires. The former (SF-36) is a generic measure of physical and mental health status and the latter (OWLQOL) an obesity-specific measure of emotional…
Nutritional screening of older home-dwelling Norwegians: a comparison between two instruments.
2012
Ulrika S&ouml;derhamn, Bj&oslash;rg Dale, Kari Sundsli, Olle S&ouml;derhamnCentre for Caring Research-Southern Norway, Faculty of Health and Sport Sciences, University of Agder, Grimstad, NorwayBackground: It is important to obtain knowledge about the prevalence of nutritional risk and associated factors among older home-dwelling people in order to be able to meet nutritional challenges in this group in the future and to plan appropriate interventions. The aim of this survey was to investigate the prevalence of home-dwelling older people at nutritional risk and to identify associated factors using two different nutritional screening instruments as self-report instruments.Methods…
Validation of Doloplus-2 among nonverbal nursing home patients : an evaluation of Doloplus-2 in a clinical setting
2010
Published version of an article from the journal: BMC Geriatrics. Also available from the publisher: http://dx.doi.org/10.1186/1471-2318-10-9 BACKGROUND:Pain measurement in nonverbal older adults is best based on behavioural observation, e.g. using an observational measurement tool such as Doloplus-2. The purposes of this study were to examine the use of Doloplus-2 in a nonverbal nursing home population, and to evaluate its reliability and validity by comparing registered nurses' estimation of pain with Doloplus-2 scores.METHOD:In this cross-sectional study, Doloplus-2 was used to observe the pain behaviour of patients aged above 65 years who were unable to self-report their pain. Nurses al…
The Epidemiology of Low- and High-Energy Distal Radius Fracture in Middle-Aged and Elderly Men and Women in Southern Norway
2012
Background Distal radius is one of the most frequent sites for fractures in the elderly population. Despite this, there is a paucity of epidemiological data for distal radius fracture, in particular, distinguishing between high- and low-energy fractures. Our aim was to study the epidemiology of high- and low-energy distal radius fracture in middle-aged and elderly men and women in Southern Norway, and search for associates with high- or low-energy distal radius fracture in this population. Methodology/Principal Findings Patients with distal radius fractures aged ≥50 years were identified from all four hospitals in Southern Norway between 2004 and 2005. Age-adjusted and age-specific incidenc…
Lived experiences of self-care among older, home-dwelling individuals identified to be at risk of undernutrition
2012
Solveig T Tomstad,1,2 Ulrika S&ouml;derhamn,2 Geir Arild Espnes,3 Olle S&ouml;derhamn21Department of Social Work and Health Science, Norwegian University of Science and Technology, Trondheim, Norway; 2Centre for Caring Research &ndash; Southern Norway, University of Agder, Grimstad, Norway; 3Research Centre for Health Promotion and Resources HiST-NTNU, Department of Social Work and Health Science, Norwegian University of Science and Technology, Trondheim, NorwayIntroduction: In a society where most older people live in their own homes, it may be expected of older individuals to exercise their potential to take care of themselves in daily life. Nutrition is a central aspect of se…