“Membranes never arise de novo ; they grow by accretion, that is, by the insertion of new molecules into a preexisting fabric. Thus, membranes come from preexisting membranes, linked by uninterrupted filiation to an ancestral membrane that may

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book info ( … for 7th edition - 2022 ) excerpts: All channels and many transporters [in the membrane] allow solutes to cross the membrane only passively (“downhill”), a process called passive transport. In the case of transport of

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source excerpt: The most abundant membrane lipids are the phospholipids. These have a polar head group containing a phosphate group and two hydrophobic hydrocarbon tails. In animal, plant, and bacterial cells, the tails are usually fa

Frank Harold website Rudolph Virchow is best remembered today for his succinct proclamation (1858) of one of biology's universal laws: Omnis cellula e cellula. Every cell comes from a preexistent cell .

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book info excerpt: Energy coupling by means of an ion current is a complicated and counterintuitive way to harvest energy. Why do it in such a roundabout manner? One answer is that a proton current makes a very flexible mechanism: a

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* -> TO INDEX PAGE 1 <- *

* -> TO INDEX PAGE 2 <- *

* -> TO INDEX PAGE 3 <- *

* -> TO INDEX PAGE 4 <- *

* -> TO INDEX PAGE 5 <- *

* visitor's guide *

Below each index page image is a single word which gives a hint to the subject on that webpage.

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Clicking on any index page image opens a webpage, which most often contains an illustrated 1,000 word essay and an image collection. External links are provided to offer in-depth discussion of the subject.

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*** The layout and organization of imagessays.com is a bit tangential by design, leading the visitor to an exploration of related subjects, informing in an unexpected manner, and so expanding the knowledge base of the viewer. ***

primary webpage: seeing

secondary webpage: marrow

annotated list of webpages: * annotated *

“Whenever I discovered something which was noteworthy,

I have felt it my duty to put down what I had discovered,

in order that it would become known to the educated world.”

Antonie van Leeuwenhoek

Letter of June 12, 1716

… see: microscope

“Sharing knowledge is the the greatest of all callings.

There is nothing like it in the land".”

The Instruction of Dua-Khety

… to his son, as he entered scribe school c. 2000 BC, Egypt - Middle Kingdom

… see: seeing

navigation

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explanation of website design

* annotated index of selected webpages *

list of essays

list of external links