Seed morphometric characteristics of European species of (Elatinaceae).

L. contains ca. 25 small, herbaceous, annual species distributed in ephemeral waters in both hemispheres.

Experimental determination of the Stern layer thickness at the interface of the human arachnoid membrane and the cerebrospinal fluid.

The paper is part of an investigation of the electrostatic forces contributing to the interaction between colloidal molecules, suspended in the cerebrospinal fluid, with other molecules of the cerebrospinal fluid and with the surrounding environment. The study is based on experimental observations and theoretical considerations. We are reporting about the microscopic observation of particles suspended in the cerebrospinal fluid which was obtained by lumbar puncture of 27 neurosurgery patients.