Review - Clinical Problem Solving in Dentistry.

Alphaproteobacteria is a class of Proteobacteria. Like all Proteobacteria, they are Gram-negative. The Alphaproteobacteria comprise most phototrophic genera, but also several genera metabolising C1-compounds (e.g., Methylobacterium spp.), symbionts of plants (e.g., Rhizobium spp.) and animals, and a group of pathogens, the Rickettsiaceae.

The classification of prokaryotic organisms is continually revised as new information is obtained (Buchanan and Gibbons, 1974). Among prokaryotes broadly called the bacteria are distinctive groups closely associated with arthropods: certain true or eubacteria, spirochetes, rickettsias, and mycoplasmas.

Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep biosphere of the earth's crust. Bacteria also live in symbiotic and parasitic relationships with plants and animals.

Spirochetes are Gram-stain-negative, helical or spiral-shaped, motile cells that can flex, rotate and translate through liquid and semisolid environments. Most spirochetes possess a cellular ultrastructure unique to bacteria in that they have internal organelles of motility, namely periplasmic flagella.

In older classifications, chytrids, except the recently established order Spizellomycetales, were placed in the class Phycomycetes under the subphylum Myxomycophyta of the kingdom Fungi. Previously, they were placed in the Mastigomycotina as the class Chytridiomycetes.

Essay on Status of Bacteria and Viruses; What is the difference between Bacteria and Virus? Short Essay on Reproduction of Viruses; characteristics, viruses. Complete information on two kingdoms and five kingdom systems of classification of living organisms and their merits and demerits.

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Classification basically is the arrangement of things in taxonomic groups in accordance to the observed similarities. It helps in understanding the group as a whole with simple ease. Now let's study about the biological classification.

Spirochaetes are distinguished from other bacterial phyla by the location of their flagella, sometimes called axial filaments, which run lengthwise between the cell membrane and outer membrane. These cause a twisting motion which allows the spirochaete to move about.

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Chapter 2: Biological Classification. Important Questions for Class 11 Biology- Biological Classification. Biological classification is the process of grouping living organisms. The five kingdom classification was proposed by R.H.Whittaker. He named the kingdoms as Monera, Protista, Fungi, Plantae and Animalia.. Corkscrew-shaped bacteria.