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Proceedings of the Royal Society of London
Article . 1879
License: Royal Society Data Sharing and Accessibility
Data sources: Crossref
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IV. On the influence of light upon protoplasm

Authors: Arthur Downes; Thomas P. Blunt;

IV. On the influence of light upon protoplasm

Abstract

This paper is in continuation of, and supplementary to, a previous communication* in which we recorded the first part of an investigation on the effect of light upon Bacteria and other organisms associated with putrefaction and decay. The chief conclusions to which those observations led us were briefly as follow:(1.) Light is inimical to, and under favourable conditions may wholly prevent, the development of these organisms; its action on Bacteria being more energetic than upon the mycelial (and torulaceous) fungi which are prone to appear in cultivation-fluids. (2.) The fitness of the cultivation-fluid as a nidus is not impaired by insolation. We found also that tubes, containing a cultivation-fluid and plugged with cotton-wool, when removed to a dark place after exposure to the sun for a sufficient period, remained perfectly clear and free from organisms for months, and we naturally thought that the contents had been reduced to permanent sterility. The following facts, however, compel us to suspend for the present our conclusions on this point. Of the many tubes which we insolated last year we finally kept only three. Two of these-containing Pasteur solution of the composition given in our former paper-had been exposed to sunlight for three weeks in June, 1877; the third tube contained urine and had been insolated for about two months-commencing July 26th. In each case corresponding tubes which were covered with laminated lead, so as to exclude light, had swarmed with Bacteria in the course of two or three days, but the three tubes of which we speak not only were perfectly pellucid at the time they were removed from the light but, although kept in a warm room, remained clear all through the winter. On February 25th, 1878, however,-eight months after we had placed

Subjects by Vocabulary

Microsoft Academic Graph classification: Sunlight Insolation Protoplasm Animal science Biology

Keywords

General Economics, Econometrics and Finance

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    32
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
32
Top 10%
Top 10%
Average
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