scholarly journals BACTERIAL GROWTH AND MULTIPLICATION AS DISCLOSED BY MICRO MOTION PICTURES

1934 ◽  
Vol 59 (3) ◽  
pp. 381-391 ◽  
Author(s):  
Ralph W. G. Wyckoff
Keyword(s):  
Life Cycle ◽  
Internal Structure ◽  
Motion Picture ◽  
Bacterial Growth ◽  
Motion Pictures ◽  
Bacterial Division ◽  
Micro Motion ◽  
Number Of Bacteria

Using a micro motion picture technique for making records, studies covering several thousand hours of observation have been made of the growth of a number of bacteria. On the basis of these experiments a discussion is offered of bacterial division and its influence on gross colony appearance, of different kinds of pleomorphism that have been observed, and of the nature of the internal structure that is seen in some bacteria. Several of the microorganisms chosen for examination are ones that have been thought to give evidence of life cycle phenomena. The present pictures, however, contain no evidence of a bacterial cycle in the commonly accepted meaning of the term.

scholarly journals THE MORPHOLOGY OF BACTERIUM SHIGAE CULTIVATED ON VARIOUS MEDIA FAVORABLE TO THE DEVELOPMENT OF FILTERABILITY AND LIFE CYCLE FORMS

1933 ◽  
Vol 57 (1) ◽  
pp. 165-180 ◽  
Author(s):  
Ralph W. G. Wyckoff
Keyword(s):  
Life Cycle ◽  
Lithium Chloride ◽  
Motion Picture ◽  
Simple Explanation ◽  
Nutrient Media ◽  
Solid Media ◽  
History Of ◽  
Micro Motion ◽  
Pass Through

A simple micro motion picture apparatus has been developed which is so inexpensive to construct and to operate that it can be used regularly for bacteriological research. With this equipment about 6000 feet of film representing 600 hours of photography have been made of B. shigae growing upon various solid media. These pictures illustrate the principal phenomena accompanying the development of this organism on ordinary nutrient media, on media consisting exclusively of either peptones or proteins, and on media containing small amounts of LiCl. Information has thus been gained concerning the existence of a life cycle in the Shiga bacillus and concerning its filterability through Berkefeld filters. The formation and history of the various "life cycle forms" are recorded but the evidence does not point to them as phases of actual cycles. In "filterable" B. shigae cultures—such as those grown in the so-called "K" broth or in lithium chloride-containing media—many small and short rods are present. It has been found that these dwarfed organisms pass through filters impervious to the cells of rapidly growing normal cultures. This offers a simple explanation of "quick reversions." The present experiments do not provide conclusive information concerning the slower reversions which are supposed to occur only after many days of treatment and incubation.

Effects of Light on Schooling and Feeding of Jack Mackerel, Trachurus symmetricus

1968 ◽  
Vol 25 (2) ◽  
pp. 393-407 ◽  
Author(s):  
John R. Hunter
Keyword(s):  
Motion Picture ◽  
Nearest Neighbor ◽  
Motion Pictures ◽  
Separation Distance ◽  
The Other ◽  
Angular Deviation ◽  
Jack Mackerel ◽  
A Value

Schools of six jack mackerel each were photographed with infrared film at eight levels of luminance and also in darkness. Three indices were used to measure the behavior of the school from motion pictures. Two of the indices, mean distance to nearest neighbor and mean separation distance, were measures of the distances between individuals in a school; the other, mean angular deviation, was a measure of differences in orientation between individuals. A value for each index was calculated for each motion picture frame.From 12.1 to 6 × 10−6 ft-L no differences existed in the angular deviation of the school or in the distances between fish. At 6 × 10−7 ft-L the intervals between fish were much larger than at higher levels of brightness and groups showed little uniformity in their orientation. Below 6 × 10−7 ft-L (darkness) schools were dispersed and the distributions of values of angular deviation were random.The ability of jack mackerel to feed on live adult Artemia was also tested at eight levels of luminance and in darkness. The number of Artemia eaten at 6 × 10−5 ft-L was about half of that eaten at the normal daytime level of 12.1 ft-L. Few Artemia were eaten at 6 × 10−7 ft-L and none in darkness.Comparison of these data with measurements of light in the sea indicated that jack mackerel probably would be able to maintain schools near the surface on a moonless starlit night and that they probably could feed effectively near the surface on a full moonlight night.

C. Francis Jenkins, Pioneer of Film and Television

2014 ◽  
Author(s):  
Donald G. Godfrey
Keyword(s):  
Motion Picture ◽  
Early Life ◽  
Motion Pictures ◽  
Early Death ◽  
The West ◽  
Television Station ◽  
Broadcast Television ◽  
Large Screen ◽  
Film And Television ◽  
American Television

This is the first biography of the important but long-forgotten American inventor Charles Francis Jenkins (1867–1934). The book documents the life of Jenkins from his childhood in Indiana and early life in the West to his work as a prolific inventor whose productivity was cut short by an early death. Jenkins was an inventor who made a difference. As one of America's greatest independent inventors, Jenkins' passion was to meet the needs of his day and the future. In 1895 he produced the first film projector able to show a motion picture on a large screen, coincidentally igniting the first film boycott among his Quaker viewers when the film he screened showed a woman's ankle. Jenkins produced the first American television pictures in 1923, and developed the only fully operating broadcast television station in Washington, D.C. transmitting to ham operators from coast to coast as well as programming for his local audience. This biography raises the profile of C. Francis Jenkins from his former place in the footnotes to his rightful position as a true pioneer of today's film and television. Along the way, it provides a window into the earliest days of both motion pictures and television as well as the now-vanished world of the independent inventor.

scholarly journals The Motion Picture Industry

1930 ◽  
Vol 4 (5) ◽  
pp. 1-4
Keyword(s):  
New York ◽  
Motion Picture ◽  
Motion Pictures ◽  
Motion Picture Industry ◽  
Business History ◽  
The Public ◽  
History Of ◽  
Business Negotiations

The early business career of motion pictures lies entangled in the correspondence and documents of the firm of Raff & Gammon which have been presented to our organization through the kindness of Terry Ramsaye, Editor-in-Chief of Pathé Exchange, Inc., New York. Lost in the volumes of vituperative letters from impatient dealers and the business negotiations of Raff & Gammon for the sale of monopoly rights for whole states, the business history of the industry awaits a thorough ransacking of the available documents. What is most apparent immediately is the excitement of the public in the new invention and the rush of the more adroit to seize the profits from its immediate exploitation.

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