Home / Quotes / Quote by Friedrich Loeffler

Quote by Friedrich Loeffler

“If diphtheria is a disease caused by a microorganism, it is essential that three postulates be fulfilled. The fulfilment of these postulates is necessary in order to demonstrate strictly the parasitic nature of a disease: 1) The organism must be shown to be constantly present in characteristic form and arrangement in the diseased tissue. 2) The organism which, from its behaviour appears to be responsible for the disease, must be isolated and grown in pure culture. 3) The pure culture must be shown to induce the disease experimentally. An early statement of Koch's postulates.”

Quote by Friedrich Loeffler

Author

Friedrich Loeffler

Friedrich Loeffler was a German scientist known for his contributions to bacteriology and virology. more

You May Also Like

“It has the property of detonating very violently in certain circumstances. On one occasion a small amount of ether solution of pyroglycerin condensed in a glass bowl. ... When the bowl was heated over a spirit lamp, an extremely violent explosion occurred, which shattered it into small fragments. On another occasion a drop was heated in a test-tube, and exploded with such violence that the glass splinters cut deep into my face and hands, and hurt other people who were standing some distance off in the room.”

“No one believes an hypothesis except its originator but everyone believes an experiment except the experimenter. Most people are ready to believe something based on experiment but the experimenter knows the many little things that could have gone wrong in the experiment.”

People Knows Feels Believe Littles Reason Facts Hands Science Gone Ready Discovery Critical Experiments Little Things Devoted Hypothesis Liable

Author:William Ian Beardmore Beveridge

“One should avoid carrying out an experiment requiring more than 10 per cent accuracy.”

Should Science Experiments Cents Accuracy

Author:Walther Nernst

“Over the last century, physicists have used light quanta electrons, alpha particles, X-rays, gamma-rays, protons, neutrons and exotic sub-nuclear particles for this purpose. Much important information about the target atoms or nuclei or their assemblage has been obtained in this way. In witness of this importance one can point to the unusual concentration of scattering enthusiasts among earlier Nobel Laureate physicists. One could say that physicists just love to perform or interpret scattering experiments.”

“Painting is a science, and should be pursued as an inquiry into the laws of nature. Why, then, may not landscape painting be considered as a branch of natural philosophy, of which pictures are but the experiments?”

Should May Philosophy Law Science Nature Natural Painting Experiments Landscape Branches Inquiry Laws Of Nature Pursued Natural Philosophy Landscape Painting

Book:John Constable's Skies: A Fusion of Art and Science

Source: John Constable's Skies: A Fusion of Art and Science

“Professor Brown: 'Since this slide was made,' he opined, 'My students have re-examined the errant points and I am happy to report that all fall close to the [straight] line.' Questioner: 'Professor Brown, I am delighted that the points which fell off the line proved, on reinvestigation, to be in compliance. I wonder, however, if you have had your students reinvestigate all these points that previously fell on the line to find out how many no longer do so?'”

Ifs Made Science Fall Lines Wonder Students Experiments Reports Brown Professors Slides Delighted Straight Lines Compliance

Author:Herbert C. Brown

“Science gains from it [the pendulum] more than one can expect. With its huge dimensions, the apparatus presents qualities that one would try in vain to communicate by constructing it on a small [scale], no matter how carefully. Already the regularity of its motion promises the most conclusive results. One collects numbers that, compared with the predictions of theory, permit one to appreciate how far the true pendulum approximates or differs from the abstract system called 'the simple pendulum'.”

Trying Matter Science Simple Results Numbers Quality Theory Huge Promise Gains Appreciate Communicate Scales Experiments Vain Abstract Dimensions Permit Predictions Regularity Pendulums

Author:Leon Foucault

“Some months ago we discovered that certain light elements emit positrons under the action of alpha particles. Our latest experiments have shown a very striking fact: when an aluminium foil is irradiated on a polonium preparation [alpha ray emitter], the emission of positrons does not cease immediately when the active preparation is removed: the foil remains radioactive and the emission of radiation decays exponentially as for an ordinary radio-element. We observed the same phenomenon with boron and magnesium.”

“For me the definition of a patriot is someone who is willing to constantly question the government; that’s what separates us from other countries.”

Country Government Willing Definitions Other Countries Patriot

Author:George Clooney

“That no generally applicable law of the formulation and development of hybrids has yet been successfully formulated can hardly astonish anyone who is acquainted with the extent of the task and who can appreciate the difficulties with which experiments of this kind have to contend.”

Kind Success Law Science Development Appreciate Tasks Difficulty Experiments Hybrid

Author:Gregor Mendel