Pfeffer sentence example
- The true nature of the relationship was first recognized by Pfeffer in 1877, but few cases were known till recent years.
- AuTH0RITIE5.Sachs, Lectures on the Physiology of Plants, translated by Marshall Ward; Vines, Lectures on the Physiology of Plants; Pfeffer, The Physiology of Plants, trans.
- The female organs of certain cryptogams, for instance, exert a positive chemiotactic action upon the spermatozoids, and probably, as Pfeffer suggests, the chemical agent which exerts the influence is malic acid.
- Pfeffer, made known the phenomena of the osmotic pressure which is set up by the passage of solvent through a membrane impermeable to the dissolved substance or solute.
- The physiology of the fungi comes under the head of that of plants generally, and the works of Pfeffer, Sachs, Vines, Darwin and Klebs may be consulted for details.Advertisement
- Pfeffer showed that certain substances in definite concentrations cause the tips of hyphae to turn towards them; other substances, though not innutritious, repel them, as also do nutritious bodies if too highly concentrated.
- In this connexion Pfeffer points out that the penetrating power .of light into a clear sea varies for light of different colours.
- P. Pfeffer (Osmotische Untersuchungen, Leipzig, 1877) was the first to obtain satisfactory measurements of osmotic pressures of cane-sugar solutions up to nearly I atmosphere by means of semi-permeable membranes of copper ferrocyanide.
- Observed originally by Engelmann in bacteria, by Stahl in myxomycetes, and by Pfeffer in ferns, mosses, &c., it has now become recognized as a widespread phenomenon.