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A NEW HELIOSTAT FOR DARK‐GROUND MICROSCOPY
Author(s) -
Pijper Adrianus
Publication year - 1962
Publication title -
journal of the royal microscopical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0368-3974
DOI - 10.1111/j.1365-2818.1962.tb02069.x
Subject(s) - heliostat , flagellum , sunlight , optics , microscopy , microscope , physics , biology , bacteria , ecology , genetics , solar energy
SYNOPSIS Sunlight dark ground microscopy with a simple heliostat has revealed a straight tail as the origin of the flagella of most motile bacteria. This tail changes into helices (“flagella”). These show specific wavelengths, with “biplicity” and take part in agglutination. All this has also been recorded cinemicrographically on 16 mm film. Among other subjects studied and filmed with this sunlight technique were bacterial motility, other types of bacterial flagella, including those of Spirilla and Vibrios , and the effect of bacteriophage and penicillin on certain bacteria. A description is here given of a new more elaborate heliostat which will throw a brighter and steadier beam of sunlight into the microscope, thus improving and facilitating further observations of which preliminary results are given here.