- 行业: Government
- Number of terms: 30456
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NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
The process of sperm cell (spermatozoa) development in male animals, in which the diploid number of chromosomes is reduced by half to the haploid number in the spermatozoa.
Industry:Natural environment
The Web Reef Advisory System (WRAS) was developed by reefbase and Reef Check, in collaboration with the Coastal Resources Center at the University of Rhode Island and the Department of Biological Sciences at the University of Southern California, as "an online application to input, view, and analyze Reef Check survey data. It calculates indicators of how good or bad a shape a particular reef is in, and what the underlying causes may be, based on Reef Check surveys." WRAS allows users to view, analyze, and add data. The file location is: www.reefcheck.org/datamanagement/.
Industry:Natural environment
Refers to the International Commission on Zoological Nomenclature (ICZN).
Industry:Natural environment
A class of toxic chemicals which act as defensive chemical secretions in some sea slugs .
Industry:Natural environment
A gene flow situation in which two reproductively isolated populations occupying the same region are genetically connected by a geographic ring of populations that can interbreed.
Industry:Natural environment
A method of creating copies of specific fragments of DNA. PCR rapidly amplifies a single DNA molecule into many billions of molecules.
Industry:Natural environment
A regulator is a piece of scuba equipment that reduces the high pressure of air in a scuba air tank to a pressure level that is usable by the diver. It delivers air to the diver only during inhalation. The modern scuba regulator is a very simple and reliable device with only a few moving parts. Regulators have two stages: a first stage that attaches to the scuba tank, and a second stage that has a mouthpiece. Air under high-pressure from the scuba tank is reduced sequentially in each stage. The first stage reduces the high tank pressure to an intermediate pressure of 100 to 150 psi above the surrounding water pressure. The second stage reduces the intermediate pressure to that needed for comfortable breathing.
Industry:Natural environment
A substrate formed by the deposition of calcium carbonate by reef building and other organisms. Habitats within this category have some colonization by live coral.
Industry:Natural environment
Allorecognition, followed by the immune effector mechanisms generated by the recognition process.
Industry:Natural environment
An organism that contains poison in its tissues that can be harmful if the organism is ingested.
Industry:Natural environment
