Track topics on Twitter Track topics that are important to you
The Pearl River Estuary (PRE) has long received tremendous amounts of anthropogenic nitrogen, and is facing severe environmental problems. Denitrification and anaerobic ammonium oxidation (anammox) are known to be two major nitrogen removal pathways in estuarine sediments. Through the use of slurry and intact sediment core incubations, we examined the nitrogen removal pathways and quantified the in situ denitrification and anammox with associated gaseous nitrogen production rates. Sedimentary nitrogen removal was predominated by denitrification (93-100%) relative to a minimal contribution (<7%) from anammox. Among the detected environmental factors, salinity, bottom water NO (nitrate and nitrite) concentration, sedimentary organic matter and dissolved oxygen consumption rates showed good correlations with denitrification and anammox rates. Sedimentary nitrogen loss was mainly supported by endogenic coupled nitrification-denitrification (6.0 ± 1.5 × 10 mol N d), with water-column-delivered NO (2.1 ± 0.6 × 10 mol N d) as the secondary source. Such results suggested that sedimentary nitrogen removal involved mainly particulate organic form (allochthonous or autochthonous) deposited onto sediments, rather than inorganic forms in overlying water. Meanwhile, total NO production from sediments was estimated to be 7.3 ± 2.1 × 10 mol N d, equivalent to ~35% of the daily NO emissions in the PRE.
This article was published in the following journal.
Name: The Science of the total environment
This study investigated the effects of adding vermiculite to the food waste composting process. Four treatments with varying vermiculite percent compositions, 0%, 5%, 10% and 15% (w/w, wet weight of f...
Prediction of organic nitrogen mineralization into ammonium during anaerobic digestion is required for optimizing substitution of mineral fertilizer by digestates. The aim of this study was to underst...
Single superphosphate (SSP) as an additive could improve phosphorus availability and reduce nitrogen loss for composts, but few studies have explored the influence of SSP on the transformation of carb...
Boreal forest soils retain significant amounts of carbon (C) and nitrogen (N) in purely organic layers, but the regulation of organic matter turnover and the relative importance of leaf litter and roo...
Carbon and nitrogen in soils play an important role in the global carbon and nitrogen cycle. The enhancement of ultraviolet radiation (predominantly UV-B) resulting from the depletion of stratospheric...
The purpose of this study is to test the effectiveness of a home-based depression treatment intervention called "Program to Encourage Active, Rewarding Lives (PEARL)". We hypothesize that ...
Gastric emptying rate, glycemic response, fermentation, and appetitive response are being assessed after consumption of traditional West African carbohydrate-based foods (pearl millet cous...
The reference technique for the conservation of gametes is storage in liquid nitrogen but new vats of nitrogen vapor (storage over liquid nitrogen) or in dry phase (storage in an insulated...
The purpose of the study is to evaluate the effectively of coating of coronary stents with two different doses of rapamycin for the prevention of coronary vessel re-blockage
Hypotheses: 1) Airway pH regulation is abnormal in severe asthma; 2) In severe asthma, there is formation of cytotoxic nitrogen oxides and loss of beneficial nitrogen oxides in the airways
The circulation of nitrogen in nature, consisting of a cycle of biochemical reactions in which atmospheric nitrogen is compounded, dissolved in rain, and deposited in the soil, where it is assimilated and metabolized by bacteria and plants, eventually returning to the atmosphere by bacterial decomposition of organic matter.
Organic compounds containing a carbon-nitrogen double bond where a NITROGEN atom can be attached to HYDROGEN or an alkyl or aryl group.
Organic compounds containing two acyl groups bound to NITROGEN.
A condition that is characterized by HEADACHE; SEIZURES; and visual loss with edema in the posterior aspects of the CEREBRAL HEMISPHERES, such as the BRAIN STEM. Generally, lesions involve the white matter (nerve fibers) but occasionally the grey matter (nerve cell bodies).
Non-specific white matter changes in the BRAIN, often seen after age 65. Changes include loss of AXONS; MYELIN pallor, GLIOSIS, loss of ependymal cells, and enlarged perivascular spaces. Leukoaraiosis is a risk factor for DEMENTIA and CEREBROVASCULAR DISORDERS.