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Artigos de revistas sobre o tema "Nitrite estimation"

Autor: Grafiati

Publicado: 9 de setembro de 2021

Última modificação: 29 de julho de 2025

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1

López-Espí, Pablo, Sancho Salcedo-Sanz, Ángel M. Pérez-Bellido, Irene de Bustamante, and Francisco López-Ferreras. "Nitrates/nitrites concentration estimation in wastewater samples using transmittance curve models optimized by evolutionary computation techniques." Journal of Hydroinformatics 12, no. 4 (2010): 446–57. http://dx.doi.org/10.2166/hydro.2010.016.

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This paper presents an application of evolutionary computation algorithms in the estimation of the concentration of nitrates/nitrites in water. Specifically, we start from the measured transmittance curves of a water sample and a model of the curve consisting of a mixture of polynomial, Fermi and Gaussian functions. An evolutionary programming algorithm is then used to obtain the optimal parameters of the model which minimize the distance between the measured and the modeled transmittance curves. This process allows us to separate the modeled transmittance curve into several components, one of

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2

Antony, Benny, Merina Benny, Binu T. Kuruvilla, and Nishant Kumar Gupta. "A VALIDATED ULTRA-PERFORMANCE LIQUID CHROMATOGRAPHY METHOD FOR NITRATE AND NITRITE MEASUREMENT." Asian Journal of Pharmaceutical and Clinical Research 11, no. 9 (2018): 257. http://dx.doi.org/10.22159/ajpcr.2018.v11i9.26519.

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Objective: The objective of this study was to develop a simple and sensitive ultra-performance liquid chromatography (UPLC) method for determination of nitrate and nitrite in plant extracts and biological samples.Methods: Nitrate was analyzed directly by injecting the filtered sample into UPLC and monitoring the chromatogram at 222 nm whereas, for nitrite analysis, the samples were derivatized using Griess reagent, and chromatogram was monitored at 520 nm. The method was validated for accuracy and precision.Results: The calibration curve was obtained in the range of 0.05–500 μg/ml for nitrate

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3

Vranić, Danijela, Jelena Milešević, Dejana Trbović, et al. "Exposure to Phosphates and Nitrites through Meat Products: Estimation of the Potential Risk to Pregnant Women." Nutrients 15, no. 12 (2023): 2777. http://dx.doi.org/10.3390/nu15122777.

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Diet during pregnancy is one of the most important nutritional challenges associated with some risks for the mother and the fetus. For the first time, the study aims to estimate long-term (2018–2022) exposure to nitrate and phosphates in Serbian pregnant women, based on individual consumption data and accurate values measured in frequently consumed meat products. For this purpose, seven types of meat products, consisting of 3047 and 1943 samples, were collected from retail markets across Serbia, to analyze nitrites and phosphorus content, respectively. These data were combined with meat produc

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4

Hassan,, S. "ESTIMATION OF DIETARY INTAKE OF NITRATE AND NITRITE IN EGYPT." Journal of Food and Dairy Sciences 27, no. 10 (2002): 6863–72. http://dx.doi.org/10.21608/jfds.2002.256867.

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5

Tapas Pramanik and Tapas Kumar Sur. "Presence of antioxidants and nitric-oxide precursors in Mimosa pudica extract." GSC Advanced Research and Reviews 7, no. 3 (2021): 104–8. http://dx.doi.org/10.30574/gscarr.2021.7.3.0124.

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Blood pressure lowering effect of Mimosa pudica induced by dieresis was reported earlier. As a diuretic it enhances urine outflow, decreases plasma volume, venous return; and thereby, reduce blood pressure. Besides the diuretic agent, some other blood pressure lowering substance may also be present in Mimosa pudica. Present study was undertaken to reveal the presence of antioxidants and nitrite in Mimosa pudica extract, which may help to reduce blood pressure. Methanolic extract of Mimosa pudica (using 80% methanol) was lyophilised to obtain dried Mimosa pudica Extract (MPE). For Total phenoli

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6

Kodandapani, Yerroju, Ajay Mohan Varahala, and Rajesh Kumar Songa. "Role of urinary nitrites in predicting steroid responsiveness of nephrotic syndrome: a study conducted in tertiary care center." International Journal of Contemporary Pediatrics 7, no. 4 (2020): 918. http://dx.doi.org/10.18203/2349-3291.ijcp20201155.

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Background: Nephrotic Syndrome (NS) is a common chronic disorder, characterized by alterations of selective permeability at the glomerular capillary wall, resulting in its inability to restrict the urinary loss of protein. Urinary nitrite excretion serves as a useful investigation in differentiating between steroid responsive and steroid resistant nephrotic syndrome. The aim of the study was to assess the relation between urinary nitrite levels and steroid responsiveness in nephrotic syndrome in children.Methods: 76 children were enrolled in the study suffering with nephrotic syndrome of which

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7

M. Jawad, Isam. "Estimation of Nitrite, Nitrate and N-Nitrosamines in Selected Food Samples." Pakistan Journal of Nutrition 11, no. 5 (2012): 481–83. http://dx.doi.org/10.3923/pjn.2012.481.483.

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8

Tapas, Pramanik, and Kumar Sur Tapas. "Presence of antioxidants and nitric-oxide precursors in Mimosa pudica extract." GSC Advanced Research and Reviews 7, no. 3 (2021): 104–8. https://doi.org/10.5281/zenodo.5074689.

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Blood pressure lowering effect of <em>Mimosa pudica</em> induced by dieresis was reported earlier. As a diuretic it enhances urine outflow, decreases plasma volume, venous return; and thereby, reduce blood pressure. Besides the diuretic agent, some other blood pressure lowering substance may also be present in <em>Mimosa pudica</em><em>. </em>Present study was undertaken to reveal the presence of antioxidants and nitrite in <em>Mimosa pudica</em> extract, which may help to reduce blood pressure. Methanolic extract of <em>Mimosa pudica</em> (using 80% met

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9

Zhu, Ao, Shu Ying Wang, and Yong Zhen Peng. "A Simple Soft Sensing Method Based on DO Simulation for COD/OUR/Ammonia/Nitrite/Nitrate in a Constant Aerotion SBR." Advanced Materials Research 588-589 (November 2012): 64–67. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.64.

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Dissolved Oxygen (DO) is one of critical factors influencing substrate degradation and nitrification rates in activated sludge process. A two-step nitrification model describing the aeration period of the sequencing batch reactor (SBR) operation is developed. Parameter estimation of this model using the DO data determine the stoichiometry and kinetic parameters as well as the initial value of main nutrients, including readily biodegradable substrate, ammonia, nitrite and nitrate. Only if the parameter estimation is implemented, reaction related substrates can be predicted if new initial values

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10

K., SIVASAMY, and RAJESWARI S. "Estimation of Capsaicin by Spectrophotometry." Journal of Indian Chemical Society Vol. 64, Mar 1987 (1987): 176–78. https://doi.org/10.5281/zenodo.6220786.

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Department of Analytical Chemistry, University of Madras, Guindy Campus, Madras 600 025 <em>Manuscript received 28 February 1985, revised 21 April 1986, accepted 9 March 1987</em> A new spectrophotometric method is reported for the estimation of capsaicin in capsicums and ehilies. Capsaicin forms yellow colour complex with sodium nitrite and sodium tungstate under acidic condition and shows maximum absorbance at 430 nm and obeys Beers law for 2-35 µg capsaicin/ml.

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11

S, Zaheera Sultana, Lakshmi T, Farquana Qushnoon, Salim A. Dhundasi, and K. K. Das. "ESTIMATION OF SERUM NITRITE IN INDIVIDUALS WITH PRIMARY HYPERTENSION." Journal of Evolution of Medical and Dental Sciences 3, no. 47 (2014): 11386–93. http://dx.doi.org/10.14260/jemds/2014/3489.

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12

Popov, N. S., D. A. Gavrilenko, M. S. Baranov, and V. Yu Balabanyan. "Development of a method for quantitative determination of nitric oxide (NO) in rat tissues based on high-performance liquid chromatography and mass spectrometry." Pharmacy & Pharmacology 12, no. 1 (2024): 49–62. http://dx.doi.org/10.19163/2307-9266-2024-12-1-49-62.

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A quantitative assessment of nitric oxide (NO) production in body tissues is an urgent problem in pharmacology and biochemistry. The study of physiological processes occurring with the participation of NO, as well as the metabolism and pharmacodynamics of pharmacological agents from the group of NO donors, requires the introduction of accurate and reproducible methods for the quantitative determination of this metabolite in biological media.The aim of the study was to develop the HPLC-MS/MS methods for the quantitative determination of NO in various tissues of rats.Materials and methods. The i

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13

John, IvinE, Jayaprasad Anekar, RajA Chirakara, KrishnaS Kumar, and Jayalakshmi Baipadavu. "Estimation of salivary nitrate and nitrite levels in different types of tobacco users - A comparative study." Journal of Indian Academy of Oral Medicine and Radiology 35, no. 4 (2023): 493. http://dx.doi.org/10.4103/jiaomr.jiaomr_341_22.

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14

Yordanov, N. D., E. Novakova, and S. Lubenova. "Consecutive estimation of nitrate and nitrite ions in vegetables and fruits by electron paramagnetic resonance spectrometry." Analytica Chimica Acta 437, no. 1 (2001): 131–38. http://dx.doi.org/10.1016/s0003-2670(01)00977-1.

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15

Penttil�, Pirjo Liisa, Leena R�s�nen, and Sinikka Kimppa. "Nitrate, nitrite, and N-nitroso compounds in Finnish foods and the estimation of the dietary intakes." Zeitschrift f�r Lebensmittel-Untersuchung und -Forschung 190, no. 4 (1990): 336–40. http://dx.doi.org/10.1007/bf01184503.

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16

Solihat, Imas, Ardina Purnama Tirta, Agung Pratama Ramdani, and Achmad Nandang Roziafanto. "Verifikasi Metode Pengujian Kadar Nitrit dalam Air Limbah Secara Spektrofotometri UV-Visibel." KOVALEN: Jurnal Riset Kimia 8, no. 1 (2022): 53–59. http://dx.doi.org/10.22487/kovalen.2022.v8.i1.15756.

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Wastewater is the residue from a business and or activity in the form of liquid. One of the chemical compounds that cause pollution is nitrite. The nitrite level in wastewater is a key parameter in determining water quality because of its toxicity. The standard method for nitrite analysis refers to SNI 06-6989.9-2004 using sulfanilic acid and N-(1-naphthyl)-ethylenediamine dihydrochloride (NED) reagents. Linearity, instrument detection limit (LDI) and quantification detection limit (LOQ), precision, accuracy, and calculation of measurement uncertainty estimation are some of the verification pa

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17

Mašić, Alma, Ana T. L. Santos, Bastian Etter, Kai M. Udert, and Kris Villez. "Estimation of nitrite in source-separated nitrified urine with UV spectrophotometry." Water Research 85 (November 2015): 244–54. http://dx.doi.org/10.1016/j.watres.2015.08.031.

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18

Gupta, Mukesh. "A New Trophic State Index for Lagoons." Journal of Ecosystems 2014 (March 9, 2014): 1–8. http://dx.doi.org/10.1155/2014/152473.

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This paper proposes a new nitrogen-based trophic state index (TSI) for the estimation of status of eutrophication in a lagoon system. Nitrite-nitrogen (NO2-N) is preferable because of its greater abundance in Chilika lagoon and its relation to other criteria of trophic state, for example, chlorophyll-a (Chl-a) and Secchi disk depth (SDD). Nitrite is preferable over nitrate because the former decreases the fluorescence and affects photosynthesis, thereby controlling primary production. This paper also computes TSI using Chl-a and SDD. The three parameters account for the biological, chemical, a

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19

Tokareva, Irina V., and Anatoly S. Prokushkin. "Seasonal and Spatial Variability of Dissolved Nutrients in the Yenisei River." Water 14, no. 23 (2022): 3935. http://dx.doi.org/10.3390/w14233935.

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The accelerated rates of warming in high latitudes lead to permafrost degradation, enhance nutrient cycling and intensify the transport of terrestrial materials to the Arctic rivers. The quantitative estimation of riverine nutrient flux on seasonal and spatial scales is important to clarify the ongoing changes in land–ocean connectivity in the Arctic domain. This study is focused on a multiyear (2015–2021) analysis of concentrations of dissolved nutrients in the Yenisei River. Applying stationary water sampling, we studied seasonal variations in concentrations of phosphate, nitrate, nitrite an

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20

Mohd Zuki, Siti Nur Syazni, Choo Ta Goh, Mohammad B. Kassim, and Ling Ling Tan. "Bio-Doped Microbial Nanosilica as Optosensing Biomaterial for Visual Quantitation of Nitrite in Cured Meats." Biosensors 12, no. 6 (2022): 388. http://dx.doi.org/10.3390/bios12060388.

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A microbial optosensor for nitrite was constructed based on biomimetic silica nanoparticles, which were doped with R5, a polypeptide component of silaffin, as a robust biosilica immobilization matrix entrapped with Raoultella planticola and NAD(P)H cofactor during the in vitro biosilicification process of silica nanoparticles. Ruthenium(II)(bipy)2(phenanthroline-benzoylthiourea), the chromophoric pH probe, was physically adsorbed on the resulting biogenic nanosilica. Optical quantitation of the nitrite concentration was performed via reflectance transduction of the bio-doped microbial nanosili

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21

Shende, Vaishali, AT Biviji, and N. Akarte. "Estimation and correlative study of salivary nitrate and nitrite in tobacco related oral squamous carcinoma and submucous fibrosis." Journal of Oral and Maxillofacial Pathology 17, no. 3 (2013): 381. http://dx.doi.org/10.4103/0973-029x.125203.

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22

Chamandust, Sajad, Mohammad Reza Mehrasebi, Koorosh Kamali, et al. "Simultaneous Determination of Nitrite and Nitrate in Milk Samples by Ion Chromatography Method and Estimation of Dietary Intake." International Journal of Food Properties 19, no. 9 (2016): 1983–93. http://dx.doi.org/10.1080/10942912.2015.1091007.

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23

Borunova, Seid-Fatima, Nikolay Tkachev, Baylar Iolchiev, et al. "Estimation of Nitrite—Nitric Oxide Derivative—In Horses with Intestinal Colic by ESR Spectroscopy." Veterinary Sciences 7, no. 4 (2020): 191. http://dx.doi.org/10.3390/vetsci7040191.

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Diseases of the gastrointestinal tract of horses are caused by many factors and have a complex pathogenesis. Developing effective methods of differential diagnostics is of high fundamental and applied importance. The pathogenesis of diseases of the digestive tract of horses accompanied by the development of inflammation and oxidative stress, can be associated with a lack of the nitrogen monoxide which controls many signaling pathways in the body. The level of the nitric oxide (NO) is involved in the regulation of the immune and nervous systems, the tone of all the blood vessels, and the course

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24

Hegde, Amitha, Varun Neekhra, and Suchetha Shetty. "Evaluation of Levels of Nitric Oxide in Saliva of Children with Rampant Caries and Early Childhood Caries : A Comparative Study." Journal of Clinical Pediatric Dentistry 32, no. 4 (2008): 283–86. http://dx.doi.org/10.17796/jcpd.32.4.4010kl5262687528.

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It is considered that caries incidence might be low in subjects with high salivary Nitric Oxide (NO) levels. Thus the objective of the present study was to determine the levels of nitric oxide in saliva of children with Rampant Caries (RC) and Early Childhood Caries (ECC). A total of 120 children were divided into 4 groups of 30 each belonging to two age groups of 6-12 yrs and 71 months or less respectively. Children between the age of 6-12 yrs were either with RC or their control and children between the age of 71months or less were either with ECC or their control respectively. The study and

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25

Oliveira, Marcelo Firmino de. "Spectrophotometric Analysis of Nitrite in Gunshot Recentness Examinations from Non Toxic Ammunitions: Expanding the Frontiers of Forensic Chemistry." International Journal of Forensic Sciences 8, no. 3 (2023): 1–8. http://dx.doi.org/10.23880/ijfsc-16000316.

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Nitrite ions consist on an important chemical clue related to gunshot examination, concerning to estimation of the time since discharge. Current forensic laboratory methods for nitrite analysis in gunshot residues are well established for investigating conventional ammunition residues. However, the use of these methods to analyze the so-called ecological or “non-toxic” ammunition has been less studied. Here, we have developed a spectrophotometric flow injection analysis method to test nitrite in samples of “non-toxic” ammunition residues. The ammunition used in these experiments was the NTA (n

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26

Lestari, Vivi Dwi, Suyitno Suyitno, and Meiliyani Siringoringo. "Analisis Faktor-Faktor Yang Berpengaruh Terhadap Pencemaran Air Sungai Mahakam Menggunakan Pemodelan Geographically Weighted Logistic Regression Pada Data Dissolved Oxygen." EKSPONENSIAL 12, no. 1 (2021): 37. http://dx.doi.org/10.30872/eksponensial.v12i1.757.

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Geographically Weighted Logistic Regression (GWLR) model is a local model of the logistic regression model applied to spatial data. Parameter estimation is performed at each observation location using spatial weighting. The spatial weighting is calculated by using an adaptive tricube function and bandwidth optimum was obtained based on Generalized Cross Validation (GCV) criteria. The purpose of this study was to obtain a GWLR model on the water pollution indicator Dissolve Oxygen (DO) in Mahakam River in East Kalimantan Province and to find factors affecting the probability of the Mahakam Rive

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27

Choi, Sung-Hee, and Hee-Jae Suh. "Determination and estimation of daily nitrite intake from processed meats in Korea." Journal of Consumer Protection and Food Safety 12, no. 1 (2016): 15–22. http://dx.doi.org/10.1007/s00003-016-1075-8.

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28

Özcan, M. M., and M. Akbulut. "Estimation of minerals, nitrate and nitrite contents of medicinal and aromatic plants used as spices, condiments and herbal tea." Food Chemistry 106, no. 2 (2008): 852–58. http://dx.doi.org/10.1016/j.foodchem.2007.06.045.

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29

Gillor, Osnat, Ayelet Harush, Ora Hadas, Anton F. Post, and Shimshon Belkin. "A Synechococcus PglnA::luxAB Fusion for Estimation of Nitrogen Bioavailability to Freshwater Cyanobacteria." Applied and Environmental Microbiology 69, no. 3 (2003): 1465–74. http://dx.doi.org/10.1128/aem.69.3.1465-1474.2003.

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ABSTRACT In contrast to extensive studies of phosphorus, widely considered the main nutrient limiting phytoplankton biomass in freshwater ecosystems, there have been few studies on the role of nitrogen in controlling phytoplankton populations. This situation may be due partly to the complexity in estimating its utilization and bioavailability. In an attempt to provide a novel tool for this purpose, we fused the promoter of the glutamine synthetase-encoding gene, P glnA, from Synechococcus sp. strain PCC7942 to the luxAB luciferase-encoding genes of the bioluminescent bacterium Vibrio harveyi.

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30

Marrs, T. C., J. E. Bright, and R. H. Inns. "Methaemoglobin Production and Reduction by Methylene Blue and the Interaction of Methylene Blue with Sodium Nitrite in vivo." Human Toxicology 8, no. 5 (1989): 359–64. http://dx.doi.org/10.1177/096032718900800505.

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Methylene blue, at high concentrations, interferes with the estimation of methaemoglobin using the IL 282 CO-oximeter: the dye does not interfere with the method of Evelyn & Malloy for determination of methaemoglobin. In beagle bitches methylene blue causes both methaemoglobinogenesis and methaemoglobin reduction, the effect of the former being to delay the decline of methaemoglobin levels, when methylene blue is used to reverse the methaemoglobinaemia produced by sodium nitrite.

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31

Inisheva, L. I., E. V. Porokhina, and A. V. Golovchenko. "Biochemical activity of peats of different genesis." Siberian Herald of Agricultural Science 54, no. 5 (2024): 5–16. http://dx.doi.org/10.26898/0370-8799-2024-5-1.

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The results of the study of enzymatic activity of peats of the three bogs of upper and lowland types – Saim, Bolshoye and Tungusovskoye (Tomsk region) are presented. The peculiarities of organic matter formation of peats of different types are given. It is shown that the properties of peats with up to eight different plants in their composition are a consequence of the different structure of polymers of the original plants. The activity indices of enzymes invertase, protease, catalase, polyphenol oxidase, nitrate and nitrite reductase in the peats of different genesis are determined. Thus, at

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32

Pandurangappa, M., and Y. Venkataramanappa. "Aminophenyl Benzimidazole as a New Reagent for the Estimation of NO2/Nitrite/Nitrate at Trace Level: Application to Environmental Samples." Analytical Letters 40, no. 15 (2007): 2974–91. http://dx.doi.org/10.1080/00032710701606382.

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33

Guisasola, Albert, Irene Jubany, Juan A. Baeza, Juli�n Carrera, and Javier Lafuente. "Respirometric estimation of the oxygen affinity constants for biological ammonium and nitrite oxidation." Journal of Chemical Technology & Biotechnology 80, no. 4 (2005): 388–96. http://dx.doi.org/10.1002/jctb.1202.

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34

Zhurihina, L. N., A. S. Bogdan, and Z. P. Kuznetsova. "EFFICIENCY OF BIOLOGICALLY ACTIVE COMPLEXES OF SOME PLANTS AT INFLUENCE PHYSICAL AND CHEMICAL POLLUTANTS AN ENVIRONMENT." Health and Ecology Issues, no. 4 (December 28, 2007): 102–6. http://dx.doi.org/10.51523/2708-6011.2007-4-4-22.

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Biologically active substances of the polyphenolic nature from leaves Begonia erytrophylla, from elevated weight Laserpitium latifolium and Vaccinium macrocarpon Ait are isolated. The biological estimation of the isolated complexes in experiments on Tetrahymena pyriformis has revealed the expressed protective effect at individual and combined influence of lead, sodium nitrite and ultraviolet radiation. The protective effect was showed in stimulation of regenerative processes in the irradiated cells and prolongation of life cycle of a population.

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Lim, Ho Soo, Sang Jin Lee, Euna Choi, Soo Bin Lee, Hye Seon Nam, and Jong Kwon Lee. "Development and validation of an ionic chromatography method for nitrite determination in processed foods and estimation of daily nitrite intake in Korea." Food Chemistry 382 (July 2022): 132280. http://dx.doi.org/10.1016/j.foodchem.2022.132280.

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36

Sanyal, Asis K. "Rapid and Selective Method for Quantitation of Metronidazole in Pharmaceuticals." Journal of AOAC INTERNATIONAL 71, no. 4 (1988): 849–51. http://dx.doi.org/10.1093/jaoac/71.4.849.

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Abstract A selective and highly sensitive assay for /V-1-substituted nitroimidazoles has been modified and adapted for rapid estimation of metronidazole in pharmaceuticals. The color reaction is based on diazotization of sulfanilamide with the nitrite ions liberated by alkaline hydrolysis of metronidazole and subsequent coupling of the diazonium salt with JV-l-(naphthyl)-ethylenediamine dihydrochloride. This method is applicable for the assay of benzoyl metronidazole in oral suspension. Officially recommended excipients and preservatives do not interfere.

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Majeed Mahmoud Khalaf and Riedh A. Abdul - Jabbad. "Estimation of some plant nutrition and heavy metals in Euphrates River at AL-Ramadi and Khalidiah Cities." Tikrit Journal of Pure Science 22, no. 8 (2023): 1–9. http://dx.doi.org/10.25130/tjps.v22i8.845.

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This study was carried out in Euphrates River at Al-Jazira region in between the cities of Al-Ramadi and khalidiah in AL-Anbar province. Seven stations were selected. The first one was west to AL-Ramadi, and the Last one was at Al-Khalidiah bridge. The study was carried out during the period from September 2013 to June 20l4. Results of the plant nutrition of nitrite, phosphate and silica were (0.01-0.3) μg nitrogen atom-nitrite, (0.11-0.79) μg phosphorus -atom- phosphate, and (0.58-1.39) mg/L. Heavy metals of chrome and cobalt were in between the allowed values of the Iraqi drinking water char

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Кулаков, А. А. "Estimation of the achievability of the environmental and technological regulations at small wastewater treatment facilities." Vodosnabzhenie i sanitarnaia tehnika, no. 3 (March 17, 2022): 46–51. http://dx.doi.org/10.35776/vst.2022.03.06.

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Переход отрасли водопроводно-канализационного хозяйства на технологическое нормирование диктует новые экологические требования для канализационных очистных сооружений. Оценена вероятность достижения природоохранных и технологических нормативов на 117 объектах. Для двух групп очистных станций (сверхмалые, малые и небольшие) определена достижимость нормативов по взвешенным веществам, БПКполн, азоту (аммонийному, нитритному, нитратному) и фосфору фосфатов. Наименьшая доля объектов с достижением предельно допустимых концентраций для водных объектов рыбохозяйственного значения отмечена по взвешенны

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Ginestet, Philippe, Jean-Marc Audic, Vincent Urbain, and Jean-Claude Block. "Estimation of Nitrifying Bacterial Activities by Measuring Oxygen Uptake in the Presence of the Metabolic Inhibitors Allylthiourea and Azide." Applied and Environmental Microbiology 64, no. 6 (1998): 2266–68. http://dx.doi.org/10.1128/aem.64.6.2266-2268.1998.

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ABSTRACT The effects of two metabolic inhibitors on an enriched nitrifying biomass during incubation for short periods of time were investigated by determining respirometric measurements. Allylthiourea (86 μM) and azide (24 μM) were shown to be strong, selective inhibitors of ammonia and nitrite oxidation, respectively. Consequently, a differential respirometry method for estimating nitrifying and heterotrophic bacterial activities within a mixed biomass is proposed.

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Johannes, I., and L. Tiikma. "Theoretical basis for the estimation of nitrite as a 4-nitroso-2,5-dimethylresorcinolate complex." Proceedings of the Estonian Academy of Sciences. Chemistry 51, no. 4 (2002): 200. http://dx.doi.org/10.3176/chem.2002.4.02.

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Sánchez, J. C. Jiménez, and J. M. Lemus Gallego. "1,3-Cyclohexanedione bis(4-methylthiosemicarbazone) monohydrochloride as analytical reagent for spectrophotometric estimation of nitrite." Microchemical Journal 32, no. 1 (1985): 69–75. http://dx.doi.org/10.1016/0026-265x(85)90055-4.

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Sharma, Sangita, Madhurjya Neog, Vipul Prajapati, Hiren Patel, and Dipti Dabhi. "Spectrophotometric Estimation of Sulfadoxine in Pharmaceutical Preparations." E-Journal of Chemistry 7, no. 4 (2010): 1246–53. http://dx.doi.org/10.1155/2010/289723.

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Four simple, sensitive, accurate and rapid visible spectrophotometric methods (A, B, C and D) have been developed for the estimation of sulfadoxine in pharmaceutical preparations. They are based on the diazotization of sulfadoxine with sodium nitrite and hydrochloric acid followed by coupling withN-(1-naphthyl) ethylenediamine dihydrochloride (Method A) to form pink coloured chromogen, diphenylamine (Method B) to form light pink coloured chromogen, chromotropic acid (in alkaline medium) (Method C) to form orange coloured chromogen, Resorcinol (in alkaline medium) (Method D) to form light orang

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Garg, Nidhi, Ashit Syngle, and Pawan Krishan. "Nitric Oxide: Link between Inflammation and Endothelial Dysfunction in Rheumatoid Arthritis." International Journal of Angiology 26, no. 03 (2016): 165–69. http://dx.doi.org/10.1055/s-0036-1597577.

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AbstractNitric oxide (NO) plays an important role in inflammatory joint disease and endothelial function. Endothelial dysfunction has been attributed to a reduction in NO bioactivity in rheumatoid arthritis (RA). However, the relationship of NO with inflammation and endothelial dysfunction in RA has not yet been investigated.To investigate the relationship of nitrite with inflammation and endothelial dysfunction in RA.Total 28 patients satisfying 2010 Rheumatoid Arthritis Classification Criteria were recruited for the study. Serum nitrite estimation was performed by Griess reaction. Flow-media

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Maky, Mohamed Abdelfattah, Mohamed A. A. Abd-ElRasoul, and Mohammed Salah. "Evaluation of some food additives and heavy metals in Egyptian meat products." January-June 6, no. 1 (2020): 61–68. http://dx.doi.org/10.14202/ijoh.2020.61-68.

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Background and Aim: Contamination of processed meat by chemicals, either by their addition for enhancing the product quality or as a result of contamination during the manufacturing process, is a crucial food safety issue that threatens human health. This research was conducted to estimate the contamination levels by harmful chemical contaminants, including nitrite, lead, cadmium, and phosphate in the Egyptian processed meats. Materials and Methods: In our study, 20 samples of each frozen sausage, pastirma, and luncheon were collected and prepared for the detection of chemical contaminants, in

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Chandran, K., Z. Hu, and B. F. Smets. "Applicability of an extant batch respirometric assay in describing dynamics of ammonia and nitrite oxidation in a nitrifying bioreactor." Water Science and Technology 52, no. 10-11 (2005): 503–8. http://dx.doi.org/10.2166/wst.2005.0729.

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Several techniques have been proposed for biokinetic estimation of nitrification. Recently, an extant respirometric assay has been presented that yields kinetic parameters for both nitrification steps with minimal physiological change to the microorganisms during the assay. Herein, the ability of biokinetic parameter estimates from the extant respirometric assay to adequately describe concurrently obtained NH4+-N and NO2−-N substrate depletion profiles is evaluated. Based on our results, in general, the substrate depletion profiles resulted in a higher estimate of the maximum specific growth r

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Iammarino, Marco, and Aurelia Di Taranto. "Nitrite and nitrate in fresh meats: a contribution to the estimation of admissible maximum limits to introduce in directive 95/2/EC." International Journal of Food Science & Technology 47, no. 9 (2012): 1852–58. http://dx.doi.org/10.1111/j.1365-2621.2012.03041.x.

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Kokurewicz, Łukasz, Mateusz Muszyński-Huhajło, Stanisław Miodoński, and Maciej Leoniak. "Critical analysis of decay rate measurement methodology." E3S Web of Conferences 100 (2019): 00035. http://dx.doi.org/10.1051/e3sconf/201910000035.

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In modeling studies, estimation of microorganisms kinetic parameters set is a key element for proper model operation and predictability. Nitrification process is very often, a crucial element of the wastewater treatment systems as bacteria responsible for ammonium and nitrite oxidation are slow growing microorganisms, making whole nitrification process vulnerable to external factors i.e. temperature, inhibition and load fluctuations. Growth and decay rate of nitrifiers decide about amount nitrifying biomass in the wastewater treatment plants, thus the nitrification efficiency. Paper presents a

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Rajaei, Z., M. Hosseini, and H. Alaei. "Effects of crocin on brain oxidative damage and aversive memory in a 6-OHDA model of Parkinson’s disease." Arquivos de Neuro-Psiquiatria 74, no. 9 (2016): 723–29. http://dx.doi.org/10.1590/0004-282x20160131.

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ABSTRACT The purpose of the present study was to investigate the effect of crocin on brain oxidative damage and memory deficits in a 6-hydroxydopamine (6-OHDA) model of Parkinson’s disease. Male Wistar rats were subjected to unilateral injection of 6-OHDA (16 µg) into the medial forebrain bundle and treated with crocin (30 and 60 mg/kg) for six weeks. The rats were tested for memory performance at six weeks after 6-OHDA infusion, and then were killed for the estimation of biochemical parameters. The increase in thiobarbituric acid reactive substances (TBARS) and nitrite levels in the hippocamp

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Vargas, M., A. Guisasola, J. Lafuente, C. Casas, and J. A. Baeza. "On-line titrimetric monitoring of anaerobic–anoxic EBPR processes." Water Science and Technology 57, no. 8 (2008): 1149–54. http://dx.doi.org/10.2166/wst.2008.140.

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Denitrifying phosphorus accumulating organisms (DPAO) are able to remove nitrogen and phosphorus simultaneously. The use of DPAO in EBPR systems results in a substantial saving on aeration cost and a lower sludge production when compared to anaerobic–aerobic EBPR systems. This process is usually studied in sequencing batch reactors (SBR) and monitored with off-line measurements. However, off-line monitoring implies low frequency data sampling and delay between sampling and obtainment of the results. For this reason, an online measurement such as titrimetry is strongly recommended to improve th

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Alexakis, Dimitrios E. "Applying Factor Analysis and the CCME Water Quality Index for Assessing Groundwater Quality of an Aegean Island (Rhodes, Greece)." Geosciences 12, no. 10 (2022): 384. http://dx.doi.org/10.3390/geosciences12100384.

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Globally, water quality indices (WQIs) are beneficial for evaluating groundwater and surface water quality. The Canadian Council of Ministers of Environment Water Quality Index (CCME WQI) was combined with the parametric values given by Directive 98/83/EC to investigate the possible suitability of groundwater resources for human consumption on Rhodes Island. Chloride (Cl−), pH, calcium (Ca2+), electrical conductivity (CND), carbonate (CO32−), bicarbonate (HCO3−), potassium (K+), magnesium (Mg2+), sulfate (SO42−), sodium (Na+),nitrate (NO3−), nitrite (NO2−), ammonium (NH4+), and phosphate (PO43

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