Nickel requirement for chemolithotrophic growth in hydrogen-oxidizing bacteria

1980 ◽  
Vol 124-124 (2-3) ◽  
pp. 131-136 ◽  
Author(s):  
Rainer Tabillion ◽  
Fred Weber ◽  
Heinrich Kaltwasser
Keyword(s):  
Chemolithotrophic Growth ◽  
Nickel Requirement ◽  
Hydrogen Oxidizing Bacteria

scholarly journals Microbes: Food for the Future

Foods ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 971
Author(s):  
Matilde Ciani ◽  
Antonio Lippolis ◽  
Federico Fava ◽  
Liliana Rodolfi ◽  
Alberto Niccolai ◽  
...  
Keyword(s):  
Food Production ◽  
Arable Land ◽  
Ghg Emissions ◽  
Weather Conditions ◽  
Biodiversity Loss ◽  
Negative Externalities ◽  
Agriculture Soil ◽  
Global Concern ◽  
Food Commodities ◽  
Hydrogen Oxidizing Bacteria

Current projections estimate that in 2050 about 10 billion people will inhabit the earth and food production will need to increase by more than 60%. Food security will therefore represent a matter of global concern not easily tackled with current agriculture practices and curbed by the increasing scarcity of natural resources and climate change. Disrupting technologies are urgently needed to improve the efficiency of the food production system and to reduce the negative externalities of agriculture (soil erosion, desertification, air pollution, water and soil contamination, biodiversity loss, etc.). Among the most innovative technologies, the production of microbial protein (MP) in controlled and intensive systems called “bioreactors” is receiving increasing attention from research and industry. MP has low arable land requirements, does not directly compete with crop-based food commodities, and uses fertilizers with an almost 100% efficiency. This review considers the potential and limitations of four MP sources currently tested at pilot level or sold as food or feed ingredients: hydrogen oxidizing bacteria (HOB), methanotrophs, fungi, and microalgae (cyanobacteria). The environmental impacts (energy, land, water use, and GHG emissions) of these MP sources are compared with those of plant, animal, insect, and cultured meat-based proteins. Prices are reported to address whether MP may compete with traditional protein sources. Microalgae cultivation under artificial light is discussed as a strategy to ensure independence from weather conditions, continuous operation over the year, as well as high-quality biomass. The main challenges to the spreading of MP use are discussed.

Detrimental and Beneficial Effects of Oxygen Exerted on Hydrogen-Oxidizing Bacteria

1981 ◽  
pp. 107-129 ◽  
Author(s):  
H. G. Schlegel ◽  
M. E. K. Ibrahim ◽  
E. Wilde ◽  
K. Schneider ◽  
M. Schlesier ◽  
...  
Keyword(s):  
Beneficial Effects ◽  
Hydrogen Oxidizing Bacteria

scholarly journals Enrichment of Hydrogen Oxidizing Bacteria from High Temperature and Salinity Environments

2020 ◽  
Author(s):  
Raquel G. Barbosa ◽  
H. Pieter J. van Veelen ◽  
Vanessa Pinheiro ◽  
Tom Sleutels ◽  
Willy Verstraete ◽  
...  
Keyword(s):  
Amino Acid ◽  
Protein Content ◽  
Amino Acid Profile ◽  
Added Value ◽  
Agricultural Practice ◽  
Microbial Protein ◽  
High Quality ◽  
Low Diversity ◽  
Thermophilic Conditions ◽  
Hydrogen Oxidizing Bacteria

There is an urgent need for sustainable protein supply routes with low environmental footprint. Recently, the use of hydrogen oxidizing bacteria (HOB) as a platform for high quality microbial protein (MP) production has regained interest. This study aims to investigate the added value of using conditions such as salt and temperature to steer HOB communities to lower diversities, while maintaining a high protein content and a high quality amino acid profile. Pressure drop and hydrogen consumption were measured for 56 days to evaluate autotrophy of a total of six communities in serum flasks. Of the six communities, four were enriched under saline (0.0, 0.25, 0.5 and 1.0 mol NaCl l−1) and two under thermophilic conditions (65°C). Five communities enriched for HOB were subsequently cultivated in continuously stirred reactors under the same conditions to evaluate their potential as microbial protein producers. The protein percentages ranged from 41 to 80%. The highest protein content was obtained for the thermophilic enrichments. Amino acid profiles were comparable to protein sources commonly used for feed purposes. Members of the genus Achromobacter were found to dominate the saline enrichments while members of the genus Hydrogenibacillus were found to dominate the thermophilic enrichments. Here we show that enriching for HOB while steering the community toward low diversity and maintaining a high quality protein content can be successfully achieved, both in saline and thermophilic conditions. IMPORTANCE Alternative feed and food supply chains are required to decrease water and land use. HOB offer a promising substitute for traditional agricultural practice to produce microbial protein (MP) from residual materials and renewable energy. To safeguard product stability, the composition of the HOB community should be controlled. Defining strategies to maintain the stability of the communities is therefore key for optimization purposes. In this study, we use salt and temperature as independent conditions to stabilize the composition of the HOB communities. Based on the results presented, we conclude that HOB communities can be steered to have low diversity using the presented conditions while producing a desirable protein content with a valuable amino acid profile.

Ubiquinones (Coenzyme Q) in hydrogen oxidizing bacteria

1983 ◽  
Vol 4 (2) ◽  
pp. 181-183 ◽  
Author(s):  
Clare Jamie Biswas ◽  
Otto Wolfgang Thiele
Keyword(s):  
Coenzyme Q ◽  
Hydrogen Oxidizing Bacteria

scholarly journals Effective orthophosphate removal from surface water using hydrogen-oxidizing bacteria: Moving towards applicability

2021 ◽  
pp. 149648
Author(s):  
Raquel G. Barbosa ◽  
Felipe Candolo Oliveira ◽  
Maria Andrés-Torres ◽  
Tom Sleutels ◽  
Willy Verstraete ◽  
...  
Keyword(s):  
Surface Water ◽  
Hydrogen Oxidizing Bacteria
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