Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 39 for “"Nitrites"”.
-
Thermochemistry and bond energies of nitro -alkanes, -alkenes, -carbonyls and corresponding nitrites
… -alkanes, -alkenes, carbonyl and corresponding nitrites representing large-scale primary, secondary and tertiary nitro compounds and their radicals resulting from the loss of skeletal hydrogen atoms. Geometries, vibration frequencies and thermochemical properties, [Delta]fH _{298}, S (T) and C …
-
The effect of naturally fermented vegetable nitrites on the color of vacuum packaged fresh pork
… research was to evaluate the effect of natural nitrites on objective color of vacuum packaged fresh pork. Sections of longissimus dorsi muscle (approximately 18 cm) were injected with solutions containing 0, 3, 6, 9 or 12 ppm of natural nitrite. Sections were sliced into chops (2.54 cm) and …
-
La nitrification dans le cadre du traitement des eaux usées: production de nitrites, préservation des nitrifiants et effet d'un support
… permettant de produire préférentiellement des nitrites ; pour ensuite, éliminer ceux-ci par dénitrification. La nitrification peut être définie comme étant la transformation biologique de composés organiques et inorganiques (NH4+) d’une forme réduite en forme plus oxydée (NO2-, NO3-). Ce …
-
La synthèse des amines par catalyse en phase aqueuse
… pour l'hydrogénation en phase aqueuse des nitrites en amines primaires correspondantes. Un premier système à base de [Rh (cod) Cl] 2 dissous dans NH 4 OH, sans présence de ligands supplémentaires, a fourni 90 % de benzylamine provenant de la réduction du benzonitrile qui a été complètement …
-
• Caractérisation hydrochimique et qualité des eaux souterraines du projet hydraulique villageois 310 forages dans la boucle du Mouhoun dans les provinces des Banwa des Balés, Mouhoun et de la Kossi (Burkina Faso)
… région. Toutefois, l’occurrence de fer, zinc et nitrites dans les eaux de forages à des concentrations supérieures aux normes admises par l’OMS indique un réel problème de potabilité. Au total, 63 forages présentent des anomalies en fer (teneurs > 0.3mg/l) et 14 forages des anomalies en zinc …
-
Acute and chronic effects of ammonia in the South African abalone, Haliotis midae Linnaeus (Mollusca)
… but the Nesslers method was more accurate. Nitrites and nitrates are toxic to abalone at much larger concentrations than ammonia and exist at low concentrations in natural systems, therefore the sensitivity of their tests was not as important. Nitrites and nitrates were monitored using the …
-
Nitrification Investigation And Modeling In The Chloraminated Drinking Water Distribution System
… major parts. (1) System variations of nitrates, nitrites, DO, pH, alkalinity, temperature, chloramine residuals and hydraulic residence times (HRT) during biological nitrification are interrelated and discussed relative to nitrification, which demonstrated Stoichiometric relationships associated …
-
ΔΟΜΗ-ΔΙΑΧΕΙΡΙΣΗ ΥΦΑΛΜΥΡΩΝ ΟΙΚΟΣΥΣΤΗΜΑΤΩΝ. Η ΠΕΡΙΠΤΩΣΗ ΕΥΤΡΟΦΙΣΜΟΥ ΤΗΣ ΒΙΣΤΩΝΙΔΑΣ
… NUTRIENTS (PHOSPHATES AMMONIA, NITRATES, NITRITES, SILICATES), PHYTOPLANKTON STANDING CROP AND COMMUNITY STRUCTURE WERE STUDIED OVER A TWELVE-MONTH PERIOD (NOVEMBER 1983-OCTOBER 1984), ANOUA ANALYSIS OF THE COLLECTED DATA REVEALED HORIZONTAL AND VERTICAL GRADIENTS OF MOST OF THE STUDIED …
-
Nitritmennyiségek hatásának vizsgálata húskészítményekben = Effect of different nitrite-concentrations in meat products
… A nátrium-nitrit önmagában méreg, ezért csak nitrites sókeverék (0,5% nátrium-nitrit-tartalmú) formájában használható fel. A disszertációm célkitűzése a húskészítményekhez hozzáadott különböző nitritmennyiségek hatásának vizsgálata volt az élelmiszer-biztonság és -minőség szempontjainak …
-
Local marine wastewater discharges : characterisation and impacts
… levels of suspended matter, nutrients (nitrates, nitrites, orthophosphates and total phosphorus), and biodegradable organic matter (measured indirectly as BOD5), as well as temporal and spatial variations in such levels. BOD5 levels of raw municipal wastewaters sampled at regular intervals over a …
-
Effects of light-emitting diode photostimulation on burn wound healing
… of surface area, tensile strength, VEGF, nitrites, and immunohistochemical markers (iNOS, VEGF, cyclooxygenase-2, Factor VIII, ED-1) on days 3, 7, and 14.\r\nBoth in vitro and in vivo findings demonstrate that LED therapy has vulnerary effects on angiogenesis, by affecting macrophage …
-
Chronic Hypoxia and Cardiovascular Dysfunction in Sleep Apnea Syndrome
… and serum concentrations of VEGF, nitrates/nitrites, catecholamines, and dopamine were measured by enzyme-linked immunosorbent assay (ELISA) and high performance liquid chromatography (HPLC). Arterial blood pressure, cardiac output, oxygen consumption and total peripheral resistance were …
-
Corrosion of steel reinforcement in concrete. Corrosion of mild steel bars in concrete and its effect on steel-concrete bond strength.
… in NaCl alkaline solution with and without nitrites due to the effect of surface roughness. Morphology investigation of mild steel specimens in alkaline solution ii containing chlorides and nitrites showed localized pits even at nitrite concentration equal to chloride concentration. …
-
Cation radical induced oxidative chemistry of hydrazones and oximes
… induced oxidative cycloaddition of hydrazones to nitrites to give trisubstituted 1,2,4-triazoles.
-
Factors Effecting Phytoplankton Assemblages in the Lafayette River Estuary
… phase, orthophosphate, combined nitrates and nitrites, ammonia, and reactive silicates.</p> <p>The River mouth had higher salinity and nutrient values, with lower temperatures than the other river sections. Diatoms were the dominant cells in this section of the River. At mid-river, salinity …
-
Treatment of urban stormwater runoff by sedimentation
… ammonia, oxidized nitrogen fonns (nitrites and nitrates), the particle-size distribution, and six heavy metals. Organic matter and total and fecal coliform bacteria were also measured but with less frequency. Dissolved oxygen measurements were made during settling of two of the …
-
Biodiversity assessment of groundwater-dependent ecosystems in Malta : evaluating copepods as bioindicators of groundwater health
… stressors, particularly salinity, nitrates, nitrites, and phosphates, on copepod populations. Typical morphological traits strongly point towards the organism being a copepod (cyclopoid or harpacticoid). The results reveal copepod presence across three groundwater bodies, two coastal aquifers …
-
Formation and evolution of atmospheric organic matter from radical intermediates
… generated from the direct photolysis of alkyl nitrites (RONO). First, OA was generated from eleven different C10 RO isomers to determine the role of radical molecular structure in the formation of low-volatility species. Here, measured aerosol yields and chemical composition were explained by …
Page 1 of 2