Review
Biochemistry & Molecular Biology
Ivan Kushkevych, Jiri Prochazka, Mario Gajdacs, Simon K. -M. R. Rittmann, Monika Vitezova
Summary: This paper discusses the two main types of bacterial photosynthesis: oxygenic and anoxygenic, focusing on the molecular mechanisms and physiological processes of purple and green sulfur bacteria. It also explores the molecular biotechnological perspectives of these phototrophic microorganisms.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Review
Agricultural Engineering
J. Fradinho, L. D. Allegue, M. Ventura, J. A. Melero, M. A. M. Reis, D. Puyol
Summary: The article introduces the potential of purple phototrophic bacteria as versatile organisms in waste management and polymer production. They adapt to various environments using unique metabolism, with internal polymers used for energy balance and reserves.
BIORESOURCE TECHNOLOGY
(2021)
Article
Microbiology
Isamu Maeda
Summary: Phototrophic purple nonsulfur bacteria (PNSB), as non-symbiotic diazotrophs, play a significant role in nitrogen fixation in rice fields, contributing to increased nitrogen gain, plant growth, and grain yield. This review discusses the properties and regulation of nitrogenase isozymes in PNSB, as well as the challenges and potential of PNSB inoculation as nitrogen biofertilizers in rice cultures.
Article
Engineering, Environmental
Felix Egger, Tim Hulsen, Damien J. Batstone
Summary: Anaerobic digestion produces biogas that requires desulfurization before use due to its corrosive nature. A continuous desulfurization process using purple phototrophic bacteria, powered by light, was developed as an alternative to traditional methods. This caustic-free process can integrate with anaerobic digestion using centrate as a nutrient source, but may be limited by the availability of light for nighttime operation in a scaled process.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Prashant Praveen, Alankar Vaidya, Keryn Tutt, John Andrews
Summary: The study characterized a community of purple phototrophic bacteria (PPB) enriched from municipal wastewater to assess their growth, tolerance, composition, and potential for resource recovery from NH4+-rich medium. The results showed that PPBs demonstrated remarkable tolerance to high concentrations of NH4+-N and acetate, with the potential for growth and protein accumulation even at elevated levels of these compounds. This suggests that PPBs have promising applications for resource recovery from NH4+-rich wastewater.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Gabriel Capson-Tojo, Shengli Lin, Damien J. Batstone, Tim Hulsen
Summary: This study evaluated the impact of different dissolved oxygen concentrations on the performance of enriched purple phototrophic bacteria (PPB) cultures in treating wastewater. The results showed that the presence of oxygen suppressed photoheterotrophic growth of PPB and led to dominant chemoheterotrophy under aerobic conditions. This suggests that PPB cannot outcompete other microbes under aerobic or microaerobic conditions, despite their aerobic capabilities.
Article
Microbiology
Karel Kopejtka, Yonghui Zeng, David Kaftan, Vadim Selyanin, Zdenko Gardian, Juergen Tomasch, Ruben Sommaruga, Michal Koblizek
Summary: Strain AAP5 is an aerobic bacterium producing bacteriochlorophyll a, belonging to the genus Sphingomonas with a close phylogenetic relationship to Sphingomonas glacialis. It has a genomic DNA G + C content of 65.9% and shared 76.2% orthologous gene clusters with Sphingomonas paucimobilis, supporting their classification into the same genus.
Article
Engineering, Environmental
Gabriel Capson-Tojo, Damien J. Batstone, Maria Grassino, Tim Hulsen
Summary: This study evaluated the light attenuation in enriched purple phototrophic bacteria (PPB) cultures. The results showed that increased biomass concentrations led to higher light attenuation, and pigment concentration had a strong effect on attenuation. A proposed mathematical model allowed effective prediction of the kinetics of photoheterotrophic growth.
Article
Engineering, Environmental
Gabriel Capson-Tojo, Damien J. Batstone, Tim Hulsen
Summary: This work presents an extended Photo-Anaerobic Model (ePAnM) that considers the metabolic capabilities of purple phototrophic bacteria (PPB), microbial clades interacting with PPB, and varying environmental conditions. The model was calibrated and validated using different datasets and was able to predict key compound concentrations and microbial communities.
Article
Engineering, Environmental
Tim Hulsen, Christian Zuger, Zuo Meng Gan, Damien J. Batstone, David Solley, Pip Ochre, Brett Porter, Gabriel Capson-Tojo
Summary: This study demonstrates the effectiveness of a 10 m long PPB-enriched flat plate photobioreactor for resource recovery from poultry processing wastewater. Different operational strategies were tested, and the reactor showed efficient removal of volatile fatty acids, nitrogen, and phosphorus. The biomass produced can be potentially used as feed, with a suitable amino acid profile.
Article
Microbiology
Izabela Mujakic, Adrian- Stefan Andrei, Tanja Shabarova, Livia Kolesar Fecskeova, Michaela M. Salcher, Kasia Piwosz, Rohit Ghai, Michal Koblizek
Summary: Gemmatimonadota bacteria are widely distributed in natural environments, including soil and water bodies. Analysis of metagenomes from five freshwater lakes in central Europe revealed diverse Gemmatimonadota populations, some of which are closely associated with phytoplankton and possess unique mitochondrial assembly genes.
Article
Engineering, Environmental
Cristian A. Sepulveda-Munoz, Andres F. Torres-Franco, Ignacio de Godos, Raul Munoz
Summary: Purple phototrophic bacteria (PPB) are efficient in nutrient and carbon removal from piggery wastewater, especially under the condition of UV-VIS filtered photosynthetic active radiation. Temperature and the type of inoculum also influence the performance of PPB in wastewater treatment.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Pharmacology & Pharmacy
Sailaja Buddhi, Ch. Sasikala
Summary: This study aims to report the diversity of purple bacteria from various habitats in India. Among the phototrophic purple bacteria, the purple non-sulfur group (PNSB) were found to be dominant. The isolated strains were identified through color, microscopic observation, and gene sequencing analysis, revealing diverse genera and phylogenetic relationships.
ANNALS OF PHYTOMEDICINE-AN INTERNATIONAL JOURNAL
(2022)
Article
Engineering, Environmental
Samuel Stegman, Damien J. Batstone, Rene Rozendal, Paul D. Jensen, Tim Hulsen
Summary: The study demonstrates the formation of purple phototrophic bacteria (PPB) granular biomass in synthetic wastewater treatment. The granules showed high settling rates and anaerobic characteristics, with a diverse microbial community and potential for resource recovery.
Article
Microbiology
Francesco Di Nezio, Clarisse Beney, Samuele Roman, Francesco Danza, Antoine Buetti-Dinh, Mauro Tonolla, Nicola Storelli
Summary: Meromictic lakes provide a stable anoxic environment for anaerobic microorganisms, with Lake Cadagno being a habitat for phototrophic sulfur bacteria contributing significantly to the lake's total productivity. Different populations of these bacteria display varying abilities in CO2 fixation through photosynthesis and chemosynthesis, showing substantial differences in activity and abundance.
FEMS MICROBIOLOGY ECOLOGY
(2021)
