We present a new method for solving regular boundary value problems for linear ordinary differential equations with constant coefficients (the case of variable coefficients can be adopted readily but is not treated here). Our approach works directly on the level of operators and does not transform the problem to a functional setting for determining the Green’s function. We proceed by representi...

The concept of nursing has many definitions. It is understood and viewed differently by the nurses themselves, by nursing students and other health professionals. This diversity can be explained by different educational backgrounds, cultures and experiences [1]. In the past, there were many definitions for nursing, including the definitions drawn up by national nurses’ associations and the defi...

Introducción: Se utilizó un diseño cuasiexperimental con solo grupo, se estudiaron 22 pacientes rango de edad entre 15 y 37 años, el objetivo fue evaluar la efectividad intervención educativa para autocuidado preeclampsia. Los instrumentos empleados son pretest postest escala modelo Dorotea Orem. resultados del muestran que 77 % las estudiadas tienen conocimiento regular sobre lo deben manejar ...

A 1,000-Dalton tangential-flow ultrafiltration (TFUF) membrane was used to isolate dissolved organic matter (DOM) from several freshwater environments. The TFUF unit used in this study was able to completely retain a polystyrene sulfonate 1,800-Dalton standard. Unaltered and TFUF-fractionated DOM molecular weights were assayed by high-pressure size exclusion chromatography (HPSEC). The weight-a...