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The cyanobacteria inhabit every illuminated environment on Earth, from polar lakes to desert crusts and through their phototrophic metabolism play essential roles in global geochemical cycles. With the discovery of marine Synechococcus and Prochlorococcus almost 30 years ago, cyanobacteria have now earned their place as dominant primary producers contributing over 25 percent of global photosynthesis. Their global abundance is now explained from the coexistence of ecotypes that occupy different niches along spatial and temporal gradients. New ecotypes of Synechococcus have been identified as abundant components of microbial communities in freshwater environments and marginal seas. Extensive comparative genomics of marine and freshwater picocyanobacteria have begun to unmask adaptations to light and nutrient (N, P, Fe) limitation that these diverse environments present. Novel types of cyanobacterial diazotrophy input new N and structure microbial communities in the open sea. Current challenges include the understanding of the interactions between marine cyanobacteria and other microbes in their immediate community. In contrast, mesotrophic and eutrophic environments such as the Laurentian Great Lakes have been increasingly affected by nuisance and toxic cyanobacterial blooms that have yielded severe declines in water quality. Factors promoting bloom formation and the functional roles of toxins are important issues being addressed today.

Cyanobacteria. --- Oceanography. --- Prochlorococcus --- Cyanobacteria --- Synechococcus --- HABs --- Nitrogen Fixation

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The cyanobacteria inhabit every illuminated environment on Earth, from polar lakes to desert crusts and through their phototrophic metabolism play essential roles in global geochemical cycles. With the discovery of marine Synechococcus and Prochlorococcus almost 30 years ago, cyanobacteria have now earned their place as dominant primary producers contributing over 25 percent of global photosynthesis. Their global abundance is now explained from the coexistence of ecotypes that occupy different niches along spatial and temporal gradients. New ecotypes of Synechococcus have been identified as abundant components of microbial communities in freshwater environments and marginal seas. Extensive comparative genomics of marine and freshwater picocyanobacteria have begun to unmask adaptations to light and nutrient (N, P, Fe) limitation that these diverse environments present. Novel types of cyanobacterial diazotrophy input new N and structure microbial communities in the open sea. Current challenges include the understanding of the interactions between marine cyanobacteria and other microbes in their immediate community. In contrast, mesotrophic and eutrophic environments such as the Laurentian Great Lakes have been increasingly affected by nuisance and toxic cyanobacterial blooms that have yielded severe declines in water quality. Factors promoting bloom formation and the functional roles of toxins are important issues being addressed today.

Cyanobacteria. --- Oceanography. --- Prochlorococcus --- Cyanobacteria --- Synechococcus --- HABs --- Nitrogen Fixation

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The cyanobacteria inhabit every illuminated environment on Earth, from polar lakes to desert crusts and through their phototrophic metabolism play essential roles in global geochemical cycles. With the discovery of marine Synechococcus and Prochlorococcus almost 30 years ago, cyanobacteria have now earned their place as dominant primary producers contributing over 25 percent of global photosynthesis. Their global abundance is now explained from the coexistence of ecotypes that occupy different niches along spatial and temporal gradients. New ecotypes of Synechococcus have been identified as abundant components of microbial communities in freshwater environments and marginal seas. Extensive comparative genomics of marine and freshwater picocyanobacteria have begun to unmask adaptations to light and nutrient (N, P, Fe) limitation that these diverse environments present. Novel types of cyanobacterial diazotrophy input new N and structure microbial communities in the open sea. Current challenges include the understanding of the interactions between marine cyanobacteria and other microbes in their immediate community. In contrast, mesotrophic and eutrophic environments such as the Laurentian Great Lakes have been increasingly affected by nuisance and toxic cyanobacterial blooms that have yielded severe declines in water quality. Factors promoting bloom formation and the functional roles of toxins are important issues being addressed today.

Cyanobacteria. --- Oceanography. --- Prochlorococcus --- Cyanobacteria --- Synechococcus --- HABs --- Nitrogen Fixation

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Six Chemicals That Changed Agriculture is a scientific look at how the chemicals used in today's food production were developed, evaluated, and came to be in wide-spread use. From fertilizers to pest management, antibiotics to DNA, chemicals have transformed the way our food is grown, protected, and processed. Agriculture is the world's most important environment interaction, the essential human activity, and an increasingly controversial activity because of its use and presumed misuse of chemistry. The major characteristics of US agriculture for at least the last six decades have been risi

Agriculture - General --- Agriculture --- Earth & Environmental Sciences --- Agricultural chemicals. --- Lime. --- Nitrogen fertilizers. --- Nitrogenous fertilizers --- Fertilizers --- Nitrogen in agriculture --- Calcia --- Calcium oxide --- Hydrated lime --- Hydraulic lime --- Quicklime --- Oxide minerals --- Agrichemicals --- Agrochemicals --- Farm chemicals --- Chemicals --- Farm supplies

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"This unique chairside handbook is the only product of its kind focused specifically on nitrous oxide and oxygen (N₂O/O₂) sedation. Now in full-color, it features a quick-access outline format, along with summary tables, clear illustrations, step-by-step photos, and a variety of techniques to equip you with all the information you need--right when and where you need it."--Back cover.

Nitrous oxide --- Oxygen therapy --- Anesthesia in dentistry --- Conscious sedation --- Inhalation anesthesia --- Therapeutic use --- Nitrous Oxide --- Anesthesia, Inhalation --- Conscious Sedation --- Oxygen --- Moderate Sedation --- Sedation, Conscious --- Sedation, Moderate --- Insufflation Anesthesia --- Anesthesia, Insufflation --- Inhalation Anesthesia --- Administration, Inhalation --- Anesthesia --- Anesthetics in dentistry --- Dental anesthesia --- Dentistry --- Respiratory therapy --- Laughing-gas --- Anesthetics --- Nitrogen oxides --- therapeutic use