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Tuesday, May 19, 2020 | History

2 edition of viscosity of protoplasm. found in the catalog.

viscosity of protoplasm.

Lewis Victor Heilbrunn

viscosity of protoplasm.

by Lewis Victor Heilbrunn

  • 43 Want to read
  • 25 Currently reading

Published by Springer in Wien .
Written in English


Edition Notes

SeriesProtoplasmatologia : Handbuch der Protoplasmaforschung. Band 2, Cytoplasma -- C, i, Protoplasmatologia -- C, i.
ID Numbers
Open LibraryOL20495595M

  A Localized Effect of Light on the Protoplasmic Viscosity of Plant Cells. An Action Spectrum for the Light Induced Changes in the Viscosity of Plant Protoplasm Books and Culture;Cited by: 7. Protoplasm, the cytoplasm and nucleus of a cell. The term was first defined in as the ground substance of living material and, hence, responsible for all living processes. Advocates of the protoplasm concept implied that cells were either fragments or containers of protoplasm. The weakness ofMissing: viscosity.

Protoplasm is a complex colloidal system, its colloidal nature was suggested by Fisher and Hardy. It contains most of the water in which various solvents of biological importance such as glucose, fatty acids, amino acids, minerals, vitamins, hormones, and enzymes are found. Studies on Living Protoplasm 67 Immediately after centrifuging, the eggs were placed in a Leitz irrigating com-pressorium, which was screwed down until just sufficient pressure was applied to prevent them rolling away under the slow current of irrigating sea water which was employed in all these by: 7.

the inner protoplasm of the unfertilised echinoderm egg is of lower consistency than the peripheral protoplasm, the former being of the consistency of a highly viscous liquid,* while the cortical layer is of a soft gel consistency. After fertilisation the viscosity of the egg protoplasm as a whole increases, until at mid-mitosis the peripheral Cited by: Viscosity 5 Viscosity coefficients Viscosity coefficients can be defined in two ways: • Dynamic viscosity, also absolute viscosity, the more usual one (typical units Pas, Poise, P); • Kinematic viscosity is the dynamic viscosity divided by the density (typical units m2/s, Stokes, St). Viscosity is a tensorial quantity that can be decomposed in different ways into two independent Size: 2MB.


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Viscosity of protoplasm by Lewis Victor Heilbrunn Download PDF EPUB FB2

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ebook access is temporary and does not include ownership of the ebook. Only valid for books with an ebook version. viscosity in the protoplasm of the eggs of Ascaris at different temperatures. But it rather seems as though Heilbronn was the first to systematically attempt real meas-urements of the viscosity of living cells.

He observed the speed with which starch grains fell through the protoplasm of certain plant cells. His first studies were. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

The Viscosity Concept --The Measurement of Protoplasmic Viscosity --Absolute Viscosity --Plant Protoplasm --Protozoan Protoplasm --Muscle Protoplasm --Nerve Protoplasm --The Protoplasm of Marine Eggs --A General Statement --The Effect of Various Physiological Factors --The Action of Temperature --The Action of Pressure and of Electricity --Radiation Effects --Visible Light --Ultraviolet.

The Viscosity of Protoplasm. Other notes: Reprinted from The Quarterly Review of Biology, Vol. II, No. 2, June,pp. Author Heilbrunn, L.V. Publisher: The Quarterly Review of Biology, Vol. The Viscosity of Protoplasm. A book that does not look new and has been read but is in excellent condition.

No obvious damage to the cover Seller Rating: % positive. Addeddate Identifier biostor Identifier-ark ark://t1rg3rp2w Journal Botanical Gazette Ocr ABBYY FineReader (Extended OCR). The book opens with an introductory chapter on the study of protoplasm.

This is followed by separate chapters on protoplasmic viscosity, protoplasmic gels, electrochemistry of the cell, the surface precipitation reaction, protoplasmic clotting, and muscular contraction.

As the great physiologist Ludwig once so aptly said, “Die Methode ist alles.” Nowhere is this epigram more important than in the study of the viscosity of protoplasm.

If we are to have adequate information concerning the viscosity of protoplasm, we must have proper methods for measuring : L. Heilbrunn.

ture concerning the fluidity or viscosity of protoplasm. Such discussion will be found in various books (Heilbrunn, ). All that we shall do here is to attempt an answer to the argument that protoplasm is never fluid. Actually it is hard to understand how such an Cited by: 2.

The cyclosis usually occurs in the sol-phase of the protoplasm and is effected by the hydrostatic pressure, temperature, pH, viscosity, etc. The intracellular movements of the pinosomes, phagosomes and various cytoplasmic organelles such as lysosomes, mitochondria, chromosomes, centrioles, etc., occur only due to cyclosis of the protoplasm.

ternal viscosity of the giant amoeba Chaos chaos was estimated to be 3 to 11 cp by this method (2). In a detailed study of the interior of cultured chicken cells, Crick and Hughes (3) found a somewhat more rigid protoplasm with evidence ofthixotropy, and suggested a value for the modulus ofrigidity about dyne/cm2.

The magnetic particle Cited by:   PHYSICAL PROPERTIES OF PROTOPLASM PROTOPLASM: THE word protoplasm, coming fromthe Greek, protos, first, and plasma, a thing formed, means literally "the first creation." Itwas used by Purkinjein for the formativematerial of the animal embryo and by von Mohl in for the contents of a plant cell.

Basically the protoplasm is a polyphasic colloidal system. The colloidal structure of protoplasm was explained by Fisher and Hardy in and respectively. Viscosity of protoplasm has been found greater than that of water, because of this reason protoplasm exhibits Brownian and amoeboid movement including cytoplasmic streaming (cyclosis).

This Siklosis caused by Hydrostatic Pressure,Temperature, pH, viscosity (viscosity), Age of Sel. • Ameboid motion, is the movement of protoplasm in the cells (especially animal cell: Amoeba, Protozoa and leukocytes) are caused by changes in the function so that the cytoplasm of elongated condition.

This Journal. Back; Journal Home; Online First; Current Issue; All Issues; Special Issues; About the journal; Journals. Back; The Lancet; The Lancet Child. Protoplasm is a polyphase emulsoid system. Physical structure and not viscosity determines the sol or gel state of an emulsion.

Consequently, while protoplasm undoubtedly exists sometimes as a sol and sometimes as a gel, yet sol and gel as descriptive terms of the physical state of protoplasm must be used with great caution when viscosity is the only by: Viscosity Values of Protoplasm as Determined by Microdissection is an article from Botanical Gazette, Volume View more articles from Botanical.

The viscosity is variable and in some cells is many times that of water or phospholipids, suggesting that lateral diffusion in biological membranes is important to cell function. The protoplasmic viscosity was studied by using a small spin label having high permeability and broad solubility properties and nickel chloride as an extracellular spin-subtracting agent to localize signal inside by:   The book opens with an introductory chapter on the study of protoplasm.

This is followed by separate chapters on protoplasmic viscosity, protoplasmic gels, electrochemistry of the cell, the surface precipitation reaction, protoplasmic clotting, and muscular Edition: 1. effects of various agents on the structural viscosity of elodea protoplasm Henry T.

Northen Plant Physiology Apr21 (2) ; DOI: /ppPhysical Properties of Protoplasm An excellent review of protoplasmic flow and related subjects by Seifriz (69) has also appeared in a recently published symposium. This review considers primarily the literature of the last three years following the English edition of Frey-Wyssling's book (32).The variation of the viscosity of gelatin sols with temperature.

Journal of Applied Chemistry3 (7), DOI: /jctbCited by: 9.