We study the stochastic dynamics of growth and shrinkage of single actin filaments taking into account insertion, removal, and ATP hydrolysis of subunits either according to the vectorial mechanism or to the random mechanism. In a previous work, we developed a model for a single actin or microtubule filament where hydrolysis occurred according to the vectorial mechanism: the filament could grow...

The analysis and modelling of processes involved in motion perception is the aim of our interdisciplinary cooperation between psychophysics and computer science 3. This paper proposes a qualitative representation of the course of motion that was the outcome of the computer science part of the project. A course of motion is described at two diierent layers that provide diierent levels of granula...

We have developed a multi-state mathematical model to describe the transmission of Plasmodium vivax malaria; the model accommodates variable transmission-blocking/enhancing immunity during the course of a blood infection, a short memory for boosting immunity, and relapses. Using the model, we simulated the incidence of human malaria, sporozoite rates in the vector population, and the level of t...

A serological survey was carried out to determine the prevalence of Chagas' disease in municipality. The following variables were analyzed to identify the form of transmission of this disease: age, sex, clinical and transfusional history, degree of kinship and serology. Within the 863 municipalities we studied, we identified 265 individuals, with serology testing done on them and on their respe...

The amount and complexity of data increase rapidly, however, due to time and cost constrains, only few of them are fully labeled. In this context non-vectorial relational data given by pairwise (dis)similarities without explicit vectorial representation, like score-values in sequences alignments, are particularly challenging. Existing semi-supervised learning (SSL) algorithms focus on vectorial...

Doerr's theory of the morphogenesis of transposition is discussed with special reference to recent studies by Goor and co-workers and Anderson and associates. The views advanced by all these authors coincide in three points: (a) the description of the reorganisation process occurring at the arterial end of the embryonic heart (a process called by Doerr vectorial bulbus rotation); (b) the pathog...

The parameterization of rotation is the subject of continuous research and development in many theoretical and applied fields of mechanics, such as rigid body, structural, and multibody dynamics, robotics, spacecraft attitude dynamics, navigation, image processing, and so on. This paper introduces the vectorial parameterization of rotation, a class of parameterization techniques encompassing ma...

Abstract Backgrounds Aniso-astigmatism may hinder normal visual development in preschool children. Knowing its prevalence, biometric parameters and risk factors is fundamental to children eye care. The purpose of this study was determine the components aniso-astigmatism associated maternal Chinese Methods In population-based, prospective cohort Nanjing Eye Study, were measured for noncycloplegi...