Dictionary » P » Protoplasm




(Science: cell biology)

The fluid living content of the cell that consists of two major divisions, the cytoplasm and the nucleoplasm (cell nucleus). It is composed mainly of nucleic acids, proteins, lipids, carbohydrates, and inorganic salts.


Charles Darwin and his 19th century contemporaries viewed "protoplasm" as the holistic content of a cell; in other words, cells were composed of a mysterious "proto-plasm," a substance that had the ability of self replication.

Word origin: From Greek (proto-), “‘first’” + (plasma), “‘something molded’”. The word was in Late Latin, meaning "first created thing," and may have existed in Medieval Greek in a different sense. It was used by Czech physiologist Johannes Evangelista Purkinje to denote the gelatinous fluid found in living tissue. This word prevailed, though Germanic language purists preferred urschleim (“‘original mucus’”).

Related forms: protoplasmic (adjective), protoplasmal (adjective).
Related phrases: totipotential protoplasm.

Compare: cytoplasm, nucleoplasm.

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Re: Help with indentifying object - can't narrow to even kingdom

... : The true plasmodial slime molds exist in nature as a plasmodium, a multinucleate blob of protoplasm up to several centimeters in diameter, without cell walls and only a cell membrane to keep everything in. This “supercell” (a syncytium) ...

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by Sadial
Fri Jul 26, 2013 6:29 pm
Forum: General Discussion
Topic: Help with indentifying object - can't narrow to even kingdom
Replies: 2
Views: 6289

The Backster Effect and Implications

... self-preservation, therefore something akin to sentience. In fact the excitement of cytoplasm is on a similar daily schedule as the excitation of protoplasm in our cells, both respond to the radiation of the sun, even if the sun isn't directly visible. And I recently asked my ecology professor ...

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by killmenow13041
Tue Nov 16, 2010 11:59 pm
Forum: Botany Discussion
Topic: The Backster Effect and Implications
Replies: 10
Views: 15774

Bio questions, help please

... (refering to amino acids) 6. Why is sucrose a non-reducing disaccharide? explain explain 7. would you expect the concentration of proteins in a protoplasm of cells to be high of low? explain 8. what is the function of bile in digestion? 9. which is a better emulsifying agent, soap or bile? explain ...

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by Rinatachka
Tue Jul 27, 2010 3:58 pm
Forum: General Discussion
Topic: Bio questions, help please
Replies: 3
Views: 5975

Protoreaction of Protoplasm

Some ideas described in "Protoreaction of Protoplasm" were developed in my recent article, "Native aggregation as a cause of origin of temporary cellular structures needed for all forms of cellular activity, signaling and transformations". ...

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by Vladimir Matveev
Tue Jul 27, 2010 4:44 am
Forum: Molecular Biology
Topic: Protoreaction of Protoplasm
Replies: 5
Views: 6893


... you probably aren't. So, for what reason should the entire cell minus the plasma membrane (with all of its associated components) be called the protoplasm? Does calling it that add any information? Does it add anything to help with the conceptual understanding of the cell? Look, if you want ...

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by mamoru
Wed Mar 17, 2010 11:31 am
Forum: Cell Biology
Topic: protoplasm
Replies: 9
Views: 10699
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