Read e-book online A Photographic Atlas of Marine Biology PDF

By Gary D. Wisehart, Erin C. Rempala, Michael J. Leboffe, David Ferguson

ISBN-10: 0895827859

ISBN-13: 9780895827852

This booklet is a full-color complement that offers images of preserved specimens and pictures taken at a variety of aquaria to supply assurance of organisms within the world's oceans. it's designed to accompany any marine biology textual content or laboratory handbook. 3-hole drilled

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Extra info for A Photographic Atlas of Marine Biology

Sample text

Cells can obtain energy from a variety of sources: light, organic chemicals, and a multitude of inorganic chemicals. Chemoautotrophs obtain their energy from inorganic chemicals. For instance, ammonia (NH3) and nitrite (NO2–) can serve as energy sources for the chemoautotrophic nitrifying bacteria (nitrification is the process of making nitrate—NO3). Some nitrifiers use ammonia as an energy source and convert it to nitrite; others then use the nitrite as an energy source and convert it to nitrate.

Many trichomes are capable of gliding motility (by an as yet undetermined mechanism) and some are enclosed in a mucilagenous sheath. Cyanobacterial trichomes often have specialized cells, including heterocysts (cystis—bag, bladder), which are nitrogen-fixing cells, and akinetes (a—without, kinetos— movement), which are resistant spores. Nitrogen fixation is the important ecological process by which nitrogen gas (N2) (a form not usable by most autotrophs and, therefore, doesn’t enter food chains) is converted into an ammonium ion (NH4+)—which is usable by most autotrophs and, therefore, enters the food chain.

Cells can obtain energy from a variety of sources: light, organic chemicals, and a multitude of inorganic chemicals. Chemoautotrophs obtain their energy from inorganic chemicals. For instance, ammonia (NH3) and nitrite (NO2–) can serve as energy sources for the chemoautotrophic nitrifying bacteria (nitrification is the process of making nitrate—NO3). Some nitrifiers use ammonia as an energy source and convert it to nitrite; others then use the nitrite as an energy source and convert it to nitrate.

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A Photographic Atlas of Marine Biology by Gary D. Wisehart, Erin C. Rempala, Michael J. Leboffe, David Ferguson


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