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The Enviro 21 bears the same relation to the Handy 21 as does a power socket to a battery. It does everything the Handy 21 does but with greater capacity and speed. Enviro 21s may also be set up to regulate all kinds of devices and appliances, including sensors, controllers, phones, fax machines, and arrays of cameras or microphones. Oxygen interacts with the inanimate physical world in two ways—through these controllable appliances and through the infrared detectors in the Handy 21s. If a door is of interest to your machines, you paste an infrared tag on it.

Dogma had signed that definitively identify it in the long held that most finfish and shellfish blood or tissues. Fortunately, progress exposed to sublethal doses of toxins is being made. Peter D. R. Moeller and from harmful algae suffer no ill effects. John S. , have semi- trouble that had been overlooked— perpurified components of Pfiesteria tox- haps by interfering with reproduction, A 48 Scientific American August 1999 with the survival of sensitive young fish or with resistance to disease?

Noga, C. W. Hobbs and H. B. , in Nature, Vol. 358, pages 407–410; July 30, 1992. Neoplasia and Biotoxins in Bivalves: Is There a Connection? Jan Landsberg in Journal of Shellfish Research, Vol. 15, No. 2, pages 203–230; June 1996. Implications of Harmful Microalgae and Heterotrophic Dinoflagellates in Management of Sustainable Marine Fisheries. JoAnn M. Burkholder in Ecological Applications, Vol. 8, No. 1 (Supplement), pages 537–562; February 1998. Marine Ecosystems: Emerging Diseases and Indicators of Change.

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