Functional analysis of AI-2/LuxS from bacteria in Chinese fermented meat after high nitrate concentration shock

&#160;In Seoul, PM2.5 concentrations were frequently elevated with O3 in May 2019. The most abundant constituent of PM2.5 was nitrate, which was the best correlated with OC (organic carbon) as well as NH4+. An intensive experiment was conducted in the eastern part of Seoul from March 29 to June 19, 2019. Measurement was made for PM2.5 and its chemical composition including NO3-, SO42-, NH4+ , OC, EC (elemental carbon), and reactive gases including O3, NO, NO2, CO, HONO, HNO3, NH3, and SO2, and meteorological variables including vertical winds and mixed layer height (MLH). The particle number concentration was measured using SMPS (Scanning Mobility Particle Sizer). All measurements were averaged for 1 hour according to the resolution of PM2.5 chemical composition. For the entire experiment, the mean mass concentrations of PM2.5, NO3-, SO42-, NH4+, OC, and EC were 20.40 &#956;g/m3, 4.07 &#956;g/m3, 2.62 &#956;g/m3, 2.01 &#956;g/m3, 4.01 &#956;g/m3, and 1.04 &#956;g/m3, respectively. For reactive gases, the mean concentration was 1.03 ppbv for HONO, 0.70 ppbv for HNO3, 14.87 ppbv for NH3, 2.77 ppbv for SO2, and 48.79 ppbv for O3.&#160;&#160;The maximum PM2.5 concentration of 72.81 &#956;g/m3 was observed under the influence of weak Asian dust event in the end of April. In May, there were three distinct episodes with highly enhanced PM2.5. In the early May, the maximum nitrate concentration (36.11 &#956;g/m3) was observed with high HONO (2.41 ppbv) on 4 May. In the middle of May, PM2.5 was raised with SO42- under stagnant condition. On 25 May, PM2.5 was raised up to 92 &#956;g/m3 with high nitrate concentration (18.56 &#956;g/m3) , when O3 reached 205 ppbv. In this episode, O3 concentration remained around 90 ppbv at night and OC and EC were well correlated with highly enhanced K+. Thus, the concurrent enhancement of PM2.5 and O3 was likely due to the influence of aged biomass combustion plume laden air transported from southeast China. At the same time, HNO3 and HONO concentration was highly elevated, indicating that heterogeneous reactions played a role.

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Understanding and Modeling of Chemical Transition of Nitrate Accompanied with Corrosion of Carbon Steel under Hyper-alkaline and High Nitrate Concentration Conditions

Zairyo-to-Kankyo ◽

10.3323/jcorr.60.541 ◽

2011 ◽

Vol 60 (12) ◽

pp. 541-552 ◽

Cited By ~ 1

Author(s):

Akira Honda ◽

Kaoru Masuda ◽

Tsuyoshi Tateishi ◽

Osamu Kato ◽

Hiroyuki Inoue

Keyword(s):

Carbon Steel ◽

Nitrate Concentration ◽

High Nitrate Concentration

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Modeling Nitrate Transport in a Small Upland Stream

Water Quality Research Journal ◽

10.2166/wqrj.1978.013 ◽

1978 ◽

Vol 13 (1) ◽

pp. 161-174

Author(s):

W.N. Stammers ◽

J.B. Robinson ◽

H.R. Whiteley ◽

N. K. Kaushik ◽

P. Sain

Keyword(s):

Peak Flow ◽

Nitrate Concentration ◽

Stream Water ◽

Surface Flow ◽

Nitrate Transport ◽

Stream Channel ◽

Southern Ontario ◽

Flow Rates ◽

High Nitrate Concentration ◽

The Mean

Abstract Swifts Brook, a small headwater stream within the Grand River Watershed in Southern Ontario, originates, during baseflow periods, in a spring with a high nitrate concentration. The spring, which is the principle source of summer streamflow for the brook, has peak flow rates of up to 5.5 l sec 1 in March and April and minimum flowrates as low as 2.8 l sec in August or September. The nitrate concentration in the spring is highest during periods of highest flowrate and lowest in October or November. The mean annual concentrations of NO3 ~*-N in the spring outflow, weighted by flowrate, were 4.3 mg SL * in 1975 and 4.1 mg l in 1976. During dry summer conditions a two km reach of the main channel, beginning at the spring, receives no surface flow contributions from ephemeral tributaries. Stream processes in this portion of the stream channel were studied in detail (Robinson et al. 1977). The location of the spring and study reaches are shown in Fig. 1. For this reach, the stream water surface width varied from 0.7 to 3.8 meters and the water depth and average velocity vary from 0.08 to 0.23 meters and 0.004 to 0.05 m sec respectively.

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The ultra-violet absorption of sea water

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400016179 ◽

1961 ◽

Vol 41 (3) ◽

pp. 591-597 ◽

Cited By ~ 60

Author(s):

F. A. J. Armstrong ◽

G. T. Boalch

Keyword(s):

Surface Waters ◽

Coastal Waters ◽

Sea Water ◽

Nitrate Concentration ◽

Ultra Violet ◽

Short Wave ◽

Atlantic Water ◽

Seasonal Effect ◽

High Nitrate Concentration ◽

The Difference

SUMMARYMeasurements of the ultra-violet absorption spectra between 200 and 400 mix, have been made with a spectrophotometer. At short wave-lengths natural sea water has double the absorbancy of artificial sea water. The difference in samples from shallow depths is ascribed to organic material, of which part may be the Gelbstoff of Kalle. Regional variations have been found, coastal waters having higher U.V. absorptions. A small seasonal effect with an increase in absorbancy in summer in the English Channel has been seen. In deep Atlantic water increased absorption below 235 m/x may be due to its high nitrate concentration. At longer wave-lengths absorbancies were less than in surface waters. Measurements of U.V. absorption may supplement other physical methods of characterizing water masses.

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Nitrate removal in a combined bioelectrochemical and sulfur autotrophic denitrification system under high nitrate concentration: effects of pH

Bioprocess and Biosystems Engineering ◽

10.1007/s00449-017-1879-7 ◽

2017 ◽

Vol 41 (4) ◽

pp. 449-455 ◽

Cited By ~ 18

Author(s):

Dan Chen ◽

Dong Wang ◽

Zhixing Xiao ◽

Hongyu Wang ◽

Kai Yang

Keyword(s):

Nitrate Concentration ◽

Nitrate Removal ◽

Autotrophic Denitrification ◽

Concentration Effects ◽

High Nitrate Concentration ◽

Effects Of Ph

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Assessment of Nitrate Removal Capacity of Two Selected Eukaryotic Green Microalgae

Cells ◽

10.3390/cells10092490 ◽

2021 ◽

Vol 10 (9) ◽

pp. 2490

Author(s):

Vaishali Rani ◽

Gergely Maróti

Keyword(s):

Nitrate Concentration ◽

Nitrate Removal ◽

Synthetic Wastewater ◽

Green Microalgae ◽

Chlorella Sp ◽

Removal Capacity ◽

High Nitrate Concentration ◽

Chlamydomonas Sp ◽

Carbohydrate Contents ◽

Phosphate Medium

Eutrophication is a leading problem in water bodies all around the world in which nitrate is one of the major contributors. The present study was conducted to study the effects of various concentrations of nitrate on two eukaryotic green microalgae, Chlamydomonas sp. MACC-216 and Chlorella sp. MACC-360. For this purpose, both microalgae were grown in a modified tris-acetate-phosphate medium (TAP-M) with three different concentrations of sodium nitrate, i.e., 5 mM (TAP-M5), 10 mM (TAP-M10) and 15 mM (TAP-M15), for 6 days and it was observed that both microalgae were able to remove nitrate completely from the TAP-M5 medium. Total amount of pigments decreased with the increasing concentration of nitrate, whereas protein and carbohydrate contents remained unaffected. High nitrate concentration (15 mM) led to an increase in lipids in Chlamydomonas sp. MACC-216, but not in Chlorella sp. MACC-360. Furthermore, Chlamydomonas sp. MACC-216 and Chlorella sp. MACC-360 were cultivated for 6 days in synthetic wastewater (SWW) with varying concentrations of nitrate where both microalgae grew well and showed an adequate nitrate removal capacity.

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Remote-Sensing-Based Estimation of Surface Nitrate and Its Variability in the Southern Peninsular Indian Waters

International Journal of Oceanography ◽

10.1155/2011/172731 ◽

2011 ◽

Vol 2011 ◽

pp. 1-16 ◽

Cited By ~ 8

Author(s):

R. K. Sarangi

Keyword(s):

Indian Ocean ◽

Bay Of Bengal ◽

Arabian Sea ◽

Nitrate Concentration ◽

Southwest Monsoon ◽

Northeast Monsoon ◽

Northern Indian Ocean ◽

Noaa Avhrr ◽

Nitrate Concentrations ◽

High Nitrate Concentration

A relationship between sea surface temperature (SST) and surface nitrate concentrations has been obtained for the first time based on in situ datasets retrieved from U.S. JGOFS (1991–96) and Indian cruises (2000–2006) in the Arabian Sea, Bay of Bengal and Indian Ocean region around the southern Indian tip. The dataset includes 1537 points. A sigmoid relationship obtained with value 0.912. NOAA-AVHRR pathfinder satellite monthly averaged SST data retrieved from the PODAAC/JPL/NASA archive during July 1999–June 2004. The datasets imported in the ERDAS-Imagine software and SST images generated on monthly and seasonal scales, for latitudes 5–12°N and longitudes 75–85°E. The ocean surface nitrate images retrieved based on the established sigmoid relationship with SST. The nitrate concentrations ranged between 0.01–3.0 μM and categorized into five ranges. The significant seasonal upwelling zone around the southwest coast of India (Kerala coast, Latitude 80.10–9.30°N and Longitude 75.60–76.20°E) was identified during July–September 1999–2004 with very high nitrate concentration (~1.00 μM). Low nitrate and nitrate-depleted zones observed during summer (March–May). In the Arabian Sea and northern Indian Ocean, high nitrate concentration (~0.50 μM) observed during the southwest monsoon (SWM), whereas the Bay of Bengal was marked with high nitrate (~0.50 μM) during the northeast monsoon (NEM). SST was high (~29°C) in the Bay of Bengal and low (~26°C) in the Arabian Sea and northern Indian Ocean during SWM and vice versa during the NEM. There is a clear inverse relationship between nitrate and SST in the study area during July 1999–June 2004.

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