A significant advance in the technique of histology and cytology is the current trend toward the use of quantitative methods of studying microscopical preparations; in other words, of substituting an objective measure of absorption 'for expressions like "more basophilic," less Feulgeu-positive," etc. Among such methods are those which Caspersson has developed for determining the absorption spec...

Science can be as stimulating to the eye as it is to the mind, according to Felice Frankel, 'artist in residence' at the Massachusetts Institute of Technology. She is working with researchers there to help them find better ways of communicating their work visually. Although she started out as a biologist, Frankel has also had a successful career as a landscape and architectural photographer. No...

PURPOSE To investigate in vivo morphology of corneal filaments. MATERIALS AND METHODS Over a 12-year period, 19 patients with corneal filaments (7 with keratoconjunctivitis sicca and 12 with other surface diseases) were examined with the slit lamp and photographed by non-contact photomicrography. RESULTS The filaments appeared as variously long and thick threads, attached at one or both end...

Chemotaxis of spermatozoa to female gonophores has been shown to occur in Campanularia, Tubularia and other hydroids (Miller, 1966 a, b). Cinemicrographic records of the movements of Campanularia spermatozoa in the vicinity of female gonophores or of glass capillary pipettes containing extracts of female hydranths have shown that chemotactic aggregation of the spermatozoa occurs because the spe...

A method is described for the microanalysis of protein, obtained from isolated tissue elements, in the range of 500 micromicrog-500 mmicrog. The method entails solubilization of cellular protein with phosphoric acid and heat after extraction of acid-soluble compounds, lipids, and RNA. A procedure for the extraction and recovery of cellular RNA by the use of 40% trichloroacetic acid is presented...