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→ link to full article Ammonia (NH3) is toxic to fish at concentrations exceeding 0.1 mg NH3/ L, which can be particularly problematic for confined ecosystems such as ornamental aquaria, ponds, and recirculating aquaculture systems. Ammonia so

source : The Nitrogen Cycle: Part One (Ammonia Oxidizers) The oxidation of ammonia (NH3) to nitrite (NO2 −) is essential for nutrient turnover in most freshwater and marine waters as well as in soils. The three groups of microorganisms that o

source : The Nitrogen Cycle: Part Two (Nitrite Oxidizers) Nitrite-oxidizers catalyze the second step of nitrification: nitrite oxidation to nitrate. Like the ammonia oxidizers, nitrite-oxidizing bacteria (NOB) play a major role in global biog

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* 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

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explanation of website design

* annotated index of selected webpages *

list of essays

list of external links