Among others, they include Rhodomicrobium, a genus of purple bacteria.

These are called purple bacteria, referring to their mostly reddish pigmentation.

A year later Engelmann discovered that purple bacteria utilise ultraviolet light in the same way.

Thus, it is of considerable interest that, in essence, the same structure is found in purple bacteria.

Others are free-living, such as Rhodopseudomonas, a purple bacterium found in marine water and soils.

Only subsequently, this occurred: for example, the "purple bacteria and relatives" were renamed Proteobacteria.

The "purple bacteria and relatives" were renamed Proteobacteria.

In the 1960s, Roderick Clayton was the first to purify the reaction centre complex from purple bacteria.

Purple bacteria were the first bacteria discovered to photosynthesize without having an oxygen byproduct.

There are some mats with a middle purple layer inhabited by photosynthesizing purple bacteria.

Cyanobacteria, green sulfur bacteria, and purple bacteria create energy by a process called photophosphorylation.

Phototrophy takes place at the cell membrane, which does not form folds or compartments as it does in purple bacteria.

The alpha-3 subdivision of the purple bacteria is considered to be a likely source of the endosymbiont that ultimately gave rise to the mitochondrion.

Purple bacteria and green sulfur bacteria occupy relatively minor ecological niches in the present day biosphere.

The energy in sunlight is captured by plants, cyanobacteria, purple bacteria, green sulfur bacteria and some protists.

In 1987, Carl Woese established this grouping, calling it informally the "purple bacteria and their relatives".

Purple bacteria (both sulfur and non-sulfur)

Purple bacteria are proteobacteria that are phototrophic, that is, capable of producing energy through photosynthesis.

In purple bacteria, such as Rhodospirillum rubrum the light-harvesting proteins are intrinsic to the chromatophore membranes.

Rhodobacter sphaeroides is a kind of purple bacteria; a group of bacteria that can obtain energy through photosynthesis.

Lastly, in 1914, Walcott reported "minute cells and chains of cell-like bodies" belonging to Precambrian purple bacteria.

Pheophytin is the first electron carrier intermediate in the photoreaction center (RC P870) of purple bacteria.

In purple bacteria, NADH is formed by reverse electron flow due to the lower chemical potential of this reaction center.

The reactions outlined above in the section concerning purple bacteria give a general illustration of the actual movement of the electrons through pheophytin and the photosystem.

In photosynthetic purple bacteria the antenna complexes function as light-harvesting systems that absorb light radiation and transfer the excitation energy to the reaction centres.