The paper included a review of the literature and some of my own research work dealing with the relationship between vitamin A and tumors. In animal experiments and in clinical investigations vitamin A and vitamin A acid had shown a preventive effect on the development of tumors as well as a therapeutic effect on certain established premalignant and malignant epithehal lesions. [The SC/B indica...

We give an example of an indefinite weight Sturm-Liouville problem whose eigenfunctions form a Riesz basis under Dirichlet boundary conditions but not under anti-periodic boundary conditions.

Bowens' disease (BD) is a precancerous condition of skin and/or mucosa with a predilection towards sun-exposed areas. Extensive literature research failed to reveal any case of multiple pigmented BD in type V Fitzpatrick skin. Multiple BD is a therapeutic challenge with a tendency to recur. Here we present an otherwise healthy Indian male having multiple pigmented lesions of BD on sun-protected...

We consider nonlinear elliptic equations with small diffusion and Dirichlet boundary conditions. We construct changing sign solutions with peaks close to the boundary and consider the location of the peak.

Let S be a closed orientable surface with genus g ≥ 2. For a sequence σi in the Teichmüller space of S, which converges to a projective measured lamination [λ] in the Thurston boundary, we obtain a relation between λ and the geometric limit of pants decompositions whose lengths are uniformly bounded by a Bers constant L. We also show that this bounded pants decomposition is related to the Gromo...

Periodic boundary conditions are applied to a ferromagnetic spin lattice. A symmetrical lattice and its contributions all over space are being used. Results, for the Ising model with ferromagnetic interaction that decays as a 1/r law, are discussed in the mean field approximation.

OBJECTIVE This study examined help seeking for gambling concerns among people with different levels of gambling problems. METHODS Ontario adults who had gambled more than dollars 100 (N=4,217) and who screened positive for a possible gambling problem (N=1,205) were classified according to gambling problem severity and asked about their experiences with gambling treatment. RESULTS Only 6% of...

An approach for ­ nding the e¬ective properties of two-dimensional periodic rectangular checkerboard media is presented; it is demonstrated that one can take a relatively simple model problem, an appropriate system of joined quarter planes, and that after appropriate conformal transformation one can use this to solve for either periodic or doubly periodic structures. Illustrative calculations i...

We consider the Navier-Stokes equations on thin 3D domains Qε = Ω×(0, ε), supplemented mainly with purely periodic boundary conditions or with periodic boundary conditions in the thin direction and homogeneous Dirichlet conditions on the lateral boundary. We prove global existence and uniqueness of solutions for initial data and forcing terms, which are larger and less regular than in previous ...

Economic aspects of possible land use strategies and protection measures in coastal zones as a response to global environmental change are examined. First, some key elements are mentioned that are of critical importance for water and land management in coastal zones. Next, various socio-economic repercussions are discussed. In this context, research needs will be addressed. Subsequently, these ...