Search results for "nitrate"
showing 10 items of 580 documents
Discharge management in fresh and brackish water RAS: Combined phosphorus removal by organic flocculants and nitrogen removal in woodchip reactors
2020
The current study combined P and N removal using organic flocculant chemicals and woodchip bioreactors in both freshwater and brackish water (7 ppm) recirculating aquaculture systems (RAS). The use of carbon (C) containing flocculant chemicals in the process was hypothesized to further stimulate C-demanding N removal (denitrification) in bioreactors. The trial of combined P and N removal consisted of four treatments: freshwater and brackish water RAS with and without the addition of supernatant from flocculation process to the woodchip reactor. Duplicate woodchip reactors were used per treatment and the trial was run for six weeks. 56 % and 49 % of P was removed from fresh and brackish slud…
Nitrate and nitrite in the diet: How to assess their benefit and risk for human health
2015
Nitrate is a natural constituent of the human diet and an approved food additive. It can be partially converted to nitrogen monoxide, which induces vasodilation and thereby decreases blood pressure. This effect is associated with a reduced risk regarding cardiovascular disease, myocardial infarction, and stroke. Moreover, dietary nitrate has been associated with beneficial effects in patients with gastric ulcer, renal failure, or metabolic syndrome. Recent studies indicate that such beneficial health effects due to dietary nitrate may be achievable at intake levels resulting from the daily consumption of nitrate-rich vegetables. N-nitroso compounds are endogenously formed in humans. However…
Analysis of nitrite and nitrate in foodstuffs-Method development, ocurrence, regulation, metrological aspects and exposure
2017
La presencia y la inocuidad de los nitritos y nitratos son un tema controvertido. El nitrito es un aditivo autorizado considerado como un ingrediente importante para la preservación de productos cárnicos. Nitrato es un componente natural de la dieta humana que, sin embargo, despierta preocupación por su supuesta potencial nocividad relacionada con cianosis, carcinogénesis y contaminación ambiental. Por lo tanto, determinaciones confiables de nitrito/nitrato son necesarias por tres razones principales: a) vigilar el cumplimiento de las regulaciones actuales sobre aditivos y contaminantes, b) determinar el contenido de nitrito/nitrato in alimentos, dietas y agua potables y c) estudiar el comp…
Slāpekļa oksīda metabolītu koncentrācija pacientiem ar 1.tipa cukura diabētu
2017
Pamatojums: pētījumos ar 1. tipa diabēta pacientiem tika konstatēta palielināta nitrīta koncentrācija plazmā. Literatūrā nav atrodami dati par nitrīta koncentrāciju 1. tipa diabēta pacientu siekalās. Mērķi: noteikt nitrīta koncentrāciju 1. tipa diabēta pacientu siekalās un tās korelāciju ar slāpekļa oksīda (NO), tā metabolītu nitrātjona (NO3) un nitrītjona (NO2) koncentrāciju asinīs, kā arī blakusslimībām un dzīvesveida faktoriem. Matriāli un metodes: pētījumam tika uzaicināti 44 pacienti no LatDiane kohortas. Dati par diabēta anamnēzi, diētu, fizisko aktivitāti un citiem dzīvesveida faktoriem tika savākti ar anketas palīdzību. 5 ml siekalu tika savākti turpmākai NO2 koncentrācijas analīzei…
Behaviour of sediment-associated silver nanoparticles and their toxicity to Lumbriculus variegatus
2017
The increasing use of silver nanoparticles (AgNPs) in industry and consumer products results in the increasing environmental concentrations of AgNPs. In the aquatic environment, sediment is the major sink for the AgNPs. The behaviour and toxicity of AgNPs in sediments is largely unknown, and therefore the potential risk to the benthic ecosystems is difficult to predict. The aim of this thesis was to study the toxicity and uptake of uncoated AgNPs (uc-AgNPs) and polyvinylpyrrolidone-coated AgNPs (PVP-AgNPs) to Lumbriculus variegatus in sediment exposures. Also, the association of AgNP-originated dissolved Ag with sediment components was studied using a sequential extraction method. Studies w…
CCDC 641246: Experimental Crystal Structure Determination
2008
Related Article: B.Abarca, R.Ballesteros, M.Chadlaoui, C.R.de Arellano, J.A.Real|2007|Eur.J.Inorg.Chem.||4574|doi:10.1002/ejic.200700640
CCDC 861462: Experimental Crystal Structure Determination
2014
Related Article: Ayan Patra, Santu Kumar Saha, Tamal K. Sen, Luca Carrella, Ghezai T. Musie, Anisur Rahman Khuda-Bukhsh, Manindranath Bera|2014|Eur.J.Inorg.Chem.||5217|doi:10.1002/ejic.201402582
Dataset: Growth, morphology and metabolic variables of charophytes (freshwater macroalgae) under different treatments of radiation, temperature and n…
2018
Esta base de datos contiene resultados de dos experimentos (RADxTEMP y RADxNIT) a escala de microcosmos referentes a variables de crecimiento, morfológicas, metabólicas y de composición estequiométrica de 2 especies de macroalgas de agua dulce, concretamente carófitos (Chara hispida y Chara vulgaris) procedentes de dos sistemas (el lago de Somolinos en Guadalajara y el Ullal de Quartons en Castellón), por tanto, 4 poblaciones (2 especies x 2 orígenes). En estos dos experimentos de diseño factorial, los individuos de las 4 poblaciones fueron sometidos a dos niveles de radiación, dos niveles de temperatura (RADxTEMP) y dos niveles de concentración de nitrato (RADxNIT). En esta matriz de datos…
Submerged macrophytes as key players in aquatic ecosystems under global change: a multiscale experimental approach
2020
El actual cambio global está causando alteraciones en los ecosistemas de todo el mundo a través de cambios interactivos en los principales factores ambientales (e.g. la temperatura, la concentración de nutrientes y la radiación ultravioleta). Los ecosistemas acuáticos continentales son altamente vulnerables ante estos cambios y, específicamente, en la región mediterránea, la situación es peor ya que la mayoría de estos sistemas son someros y están expuestos a las perturbaciones ambientales y antrópicas. Las praderas de macrófitos sumergidos y, particularmente, los carófitos, son un elemento conspicuo de estos sistemas con un papel fundamental en su funcionamiento. Estos organismos proveen d…
2020 ESC Guidelines for the management of acute coronary syndromes in patients presenting without persistent ST-segment elevation
2020
2020 ESC Guidelines for the management of acute coronary syndromes in patients presenting without persistent ST-segment elevation