The potential effect of different Ca additions (150, 300, 450, 600 and 1000 mg/L) on microbial activity and aggregation, during anaerobic digestion at moderate (8 g/L Na) and high salinity (20 g/L Na) has been investigated. Batch tests were carried out in duplicate serum bottles and operated for 30 days at 37 °C. At 8 g/L Na, methanogenic activity and protein degradation were comparable from 150 to 450 mg/L Ca, and a significant inhibition was only observed at a Caconcentration of 1000 mg/L. In contrast, at 20 g/L Na, 150 to 300 mg/L were the only Ca concentrations to maintain chemical oxygen demand (COD) removal, protein hydrolysis and methane production. Overall, increasing Ca concentrations had a larger impact on acetotrophic methanogenesis at 20 g/L than at 8 g/L Na. Increasing Ca had a negative effect on the aggregation behaviour of the dominant methanogen Methanosaeta when working at 8 g/L Na. At 20 g/L Na the aggregation of Methanosaeta was less affected by addition of Ca than at 8 g/L Na. The negative effect appeared to be connected with Ca precipitation and its impact on cell-to cell communication. The results highlight the importance of ionic balance for microbial aggregation at high salinity, bringing to the forefront the effect on Methanosaeta cells, known to be important to obtain anaerobic granules.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1016/j.nbt.2020.01.001 | DOI Listing |
Plants (Basel)
January 2025
College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, China.
Melatonin (MT) is a crucial hormone that controls and positively regulates plant growth under abiotic stress, but the biochemical and physiological processes of the combination of melatonin seed initiation and exogenous spray treatments and their effects on maize germination and seedling salt tolerance are not well understood. Consequently, in this research, we utilized the maize cultivars Zhengdan 958 (ZD958) and Demeiya 1 (DMY1), which are extensively marketed in northeastern China's high-latitude cold regions, to reveal the modulating effects of melatonin on maize salinity tolerance by determining the impacts of varying concentrations of melatonin on maize seedling growth characteristics, osmoregulation, antioxidant systems, and gene expression. The findings revealed that salt stress (100 mM NaCl) significantly inhibited maize seed germination and seedling development, which resulted in significant increases in the HO and O content and decreases in the antioxidant enzyme activity and photosynthetic pigment content in maize seedlings.
View Article and Find Full Text PDFPlants (Basel)
January 2025
State Key Laboratory of Tree Genetics and Breeding, Co-Innovation Center for Sustainable Forestry in Southern China, Bamboo Research Institute, Key Laboratory of National Forestry and Grassland Administration on Subtropical Forest Biodiversity Conservation, School of Life Sciences, Nanjing Forestry University, Nanjing 210037, China.
Chalcone synthase (CHS), the first key structural enzyme in the flavonoid biosynthesis pathway, plays a crucial role in regulating plant responses to abiotic stresses and hormone signaling. However, its molecular functions remain largely unknown in , which is one of the most economically and ecologically important bamboo species and the most widely distributed one in China. This study identified 17 genes in and classified them into seven subgroups, showing a closer evolutionary relationship to genes from rice.
View Article and Find Full Text PDFPolymers (Basel)
January 2025
College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211810, China.
Sphingan is a crucial exopolysaccharide (EPS) produced by genus bacteria with wide-ranging applications in fields such as food, medicine, and petroleum. In this study, a novel sphingan, named MT gum, was overproduced from the wild-type strain sp. MT01 at a yield of 25.
View Article and Find Full Text PDFInt J Mol Sci
January 2025
State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.
Alkaline environments such as alkaline lands, lakes, and industrial wastewater are not conducive to the growth of plants and microorganisms due to high pH and salinity. ChbZIP1 is a bZIP family transcription factor isolated from an alkaliphilic microalgae ( sp. BLD).
View Article and Find Full Text PDFInt J Mol Sci
January 2025
Xinjiang Production and Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, College of Life Science, Tarim University, Alar 843300, China.
This study aims to identify the function of the () gene in the kidneys of . CYP2E1 is a significant metabolic enzyme involved in the metabolism of various endogenous and exogenous compounds and is associated with the occurrence and progression of multiple diseases. Given 's ability to survive in the extremely arid , we hypothesize that CYP2E1 in its kidneys plays a crucial role in adaptability.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!