The marine autotroph Aureococcus anophagefferens (Pelagophyceae) was rendered axenic in order to investigate hydrolysis rates of peptides, chitobiose, acetamide, and urea as indicators of the ability to support growth on dissolved organic nitrogen. Specific rates of hydrolysis varied between 8 and 700% of rates observed in associated heterotrophic marine bacteria.
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http://dx.doi.org/10.1128/AEM.68.1.401-404.2002 | DOI Listing |
Ecology
January 2025
School of Life Sciences, Hebei University, Baoding, China.
Nitrogen (N) retention is a critical ecosystem function associated with sustainable N supply. Lack of experimental evidence limits our understanding of how grassland N retention can vary with soil acidification. A N-labeling experiment was conducted for 2 years to quantify N retention by soil pathways and plant functional groups across a soil-acidification gradient in a meadow.
View Article and Find Full Text PDFSmall
January 2025
Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China.
Covalent organic frameworks (COFs), known for the precise tunability of molecular structures, hold significant promise for photocatalytic hydrogen peroxide (HO) production. Herein, by systematically altering the quinoline (QN) linkages in triazine (TA)-based COFs via the multi-component reactions, six R-QN-TA-COFs are synthesized with identical skeletons but different substituents. The fine-tuning of the optoelectronic properties and local microenvironment of COFs is allowed, thereby optimizing charge separation and improving interactions with dissolved oxygen.
View Article and Find Full Text PDFEnviron Sci Process Impacts
January 2025
State Key Laboratory for Ecological Security of Regions and Cities, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
An integrated understanding of dissolved phosphorous (DP) export mechanism and controls on export over dry and wet periods is crucial for riverine ecological restorations in dammed river basins considering its high bioavailability and retention rates at dams. Riverine DP transport patterns (composition, sources, and transport pathways), export controls, and fate were investigated over the 2020 wet season (5 events) and dry seasons before and after it (2 events: dry and dry) in a semi-arid, small-dammed watershed to comprehend the links between terrestrial DP sources and aquatic DP sinks. Close spatiotemporal monitoring of the full range of phosphorous and total suspended solids (TSSs) and subsequent analyses (hysteresis, hierarchical partitioning, and coefficient of variation) provided the basis for the study.
View Article and Find Full Text PDFBMC Plant Biol
January 2025
Colorado Water Center, Colorado State University, Fort Collins, CO, USA.
Background: Incorporating organic manure improves soil properties and crop productivity. A long-term study started in October 1967 examined the effects of farmyard manure and nitrogen fertilization on the soil at key growth stages of pearl millet in a pearl millet-wheat cropping system over its 51st cycle.
Results: Applying 15 Mg of farmyard manure (FYM) per hectare in both growing seasons significantly boosted soil organic carbon (SOC), dissolved organic carbon (DOC), and key nutrients compared to one-season application.
Environ Sci Pollut Res Int
January 2025
Animal Production Department, Faculty of Agriculture, Cairo University, Giza, Egypt.
Aquaculture systems generate large amounts of sludge that represent serious environmental threats if discharged directly into local ecosystems. However, this nutrient-rich sediment can contribute to nutrient cycling by being applied as an organic fertilizer to ornamental medicinal trees during their early growth stages. To investigate the potential advantages of using recirculating aquaculture system sludge (RASS) and biofloc technology sludge (BFTS) as organic fertilization alternatives to chemical fertilization, a pot trial was conducted at the Faculty of Agriculture, Cairo University, Egypt.
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