Introduced species history

The history of an activated-sludge biomass affects the way in which it will respond when a new pollutant is introduced species that cannot tolerate the substance fail to reproduce and grow and tend to die off, whereas more tolerant species consume the food supply and grow and reproduce. 

The introduction of synthetic materials into natural products, often described as adulteration , is a common occurrence in food processing. The types of compounds introduced, however, are often chiral in nature, e.g. the addition of terpenes into fruit juices. The degree to which a synthetic terpene has been added to a natural product may be subsequently determined if chiral quantitation of the target species is enabled, since synthetic terpenes are manufactured as racemates. Two-dimensional GC has a long history as the methodology of choice for this particular aspect of organic analysis (38). 

There are a variety of ways that toxic Gonyaulax cells could be introduced to areas with no previous history of PSP, and most of these involve cysts. The most common claim is that transport of an established motile population by tidal and large-scale circulation patterns permits a species to deposit cysts in new areas as seeds for future blooms (1, 9, 10, 31). Within this framework, the cyst is most important in those areas where advection of... 

The penicillin group of antibiotics, also known as (3-lactam antibiotics, has revolutionized the history of modern medicine, by their effectiveness against several pathogenic bacterial species that cause various forms of infections. Penicillin G, the parent of all these antibiotics, was first isolated from a fungal species, Penicillium notatum. Since the discovery of this antibiotic, several modifications have been introduced to the parent strucmre in order to enhance the activity, increase the acid resistance, facilitate bioavailability... 

As the brief history of conducting polymers tells, initially physicists played the dominant role in research of these materials. Naturally, they borrowed names for the species and phenomena from the nomenclature of their own field, as we have already seen in the case of doping. The terms polaron, bipolaron, and sometimes soliton are frequently seen in the literature on conducting polymers. These terms have been borrowed from solid-state physics. By polaron (Fig. 2a) in connection with CPs we mean radical ion introduced by oxidizing or reducing a conducting polymer molecule. The simple molecular orbital theory shows that the charge of a... 

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