By Raymond C. Moore

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Extra info for Treatise on Invertebrate Paleontology - Part T - Echinodermata 2

Sample text

With the larvae of the common clothes moth, the greater wax moth, and possibly also the larvae of the petroleum fly (Chapter X), the water present within these organisms originates from the metabolization of organic matter (metabolic water). (D) pH level The acidity level of a body of water is determined by the concentration of H+ ions and is expressed as the pH level. The pH of natural water bodies and of soil extracts is very different. 3 shows a table with an overview of the pH levels occurring in various natural environments.

210 D Natural brine, saturated Sears Lake Calif E Natural brine, saturated Sand Springs Nevada Ostwald viscosimeter, v. 05 D E T. 1 Viscosity of various types of water, shown as a function of temperature. Viscosity comes into play with many other functions of organisms. Bacteria in highly saline waters often become active only at fairly high temperatures (45 °C), whereas analogous forms in fresh water are already active at 20 °C. It is premature to say that the bacteria present in salt lakes are thermophiles, as long as we do not know to what extent the viscosity of the external environment slows down their movement.

This can be assessed by using the Winkler test for dissolved oxygen. After adding an amount of iodide, a certain amount of iodine will be released; this can be titrated with a solution of sodium thiosulfate and provides a measure for the amount of oxygen present in the water. 1 mL normal sodium thiosulfate solution per 100 mL water) that the seaweed Ulva (9 grams per liter) produced within two hours on a sunny day, at various depths in the Nieuwediep Harbor An antiquated term which can be taken to mean non‐photosynthetic plants.

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Treatise on Invertebrate Paleontology - Part T - Echinodermata 2 by Raymond C. Moore


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