Very often the student in histology, as well as the more advanced worker in this field, finds the subject of fibrillae in cells somewhat difficult and confusing. In spite of the fact that fibrillae have been the subject of investigation for many years, authorities are not agreed concerning the structure or function of these cellular elements, and there are still some who have doubts as to their...

Some interesting properties of protoplasm are revealed when slightly hypertonic solutions of sugars or of electrolytes are applied to Nitella. The chloroplasts contract and the space between them increases and forms a characteristic pattern consisting of clear areas extending lengthwise along the cell and tapering off at both ends. The development of these areas is irreversible from the start. ...

Perineuronal glial nets in the rat spinal cord were studied. According to the density of the nets and the thickness of the processes which form them, different types of nets were demonstrated. In addition to nets originating from microglial cells, nets formed by smooth protoplasmic astrocytes are also described.

Intramembrane particles in the freeze-fractured faces of erythrocyte membranes from persons with several different types of muscular dystrophy are examined. The density of particles in the protoplasmic face was lower than that of controls, although not at a statistically significant level. No altered pattern of aggregation of these particles was observed.

In vitro aged sheep erythrocytes and sheep erythrocyte ghosts spontaneously release vesicles that consist of long protrusions affixed to flattened headlike structures. The intramembranous particles seen on the protoplasmic face of freeze fracture electron micrographs of vesicle protrusions are arranged in paired particle rows. On the equivalent fracture face of headlike structures, the particle...

The growth of a two-phase cloud of a liquid fuel in a stagnant atmosphere is studied using computational fluid dynamic techniques. In order to predict the danger and hazard of such cloud in open atmosphere it is very important to determine the fuel concentration in the cloud, especially in the far field region from the fuel reservoir. The results show that with omission of droplets break up...

The paper is focused on the formation of hydroxyapatite nanoparticles (HAp) in polyelectrolyte-modified microemulsions, in a microemulsion template phase consisting of cyclohexane, water, cationic surfactant and cosurfactant, in the presence of Na-polyacrylate (PAA) as an anionic polyelectrolyte. It is shown that PAA, can be incorporated into the individual inverse microemulsion droplets. The m...