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Nitrate supplementation

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https://www.readbyqxmd.com/read/28527336/title-potassium-application-regulates-nitrogen-metabolism-and-osmotic-adjustment-in-cotton-gossypium-hirsutum-l-functional-leaf-under-drought-stress
#1
Rizwan Zahoor, Wenqing Zhao, Muhammad Abid, Haoran Dong, Zhiguo Zhou
To evaluate the role of potassium (K) in maintaining nitrogen metabolism and osmotic adjustment development of cotton functional leaves to sustain growth under soil drought and rewatering conditions, the plants of two cotton cultivars Siza 3 (low-K sensitive) and Simian 3 (low-K tolerant), were grown under three different K rates (K0, K1, and K2; 0, 150, and 300kgK2Oha(-1), respectively) and exposed to drought stress with 40±5% soil relative water content (SRWC). The drought stress was applied at flowering stage by withholding water for eight days followed by rewatering to a well-watered level (75±5% SRWC)...
May 4, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28523645/enhancement-of-total-lipid-yield-by-nitrogen-carbon-and-iron-supplementation-in-isolated-microalgae
#2
Ramachandran Sivaramakrishnan, Aran Incharoensakdi
The biochemical contents and biodiesel production ability of three microalgal strains grown under different sodium nitrate, sodium carbonate, and ferric ammonium citrate (iron) levels were investigated. The highest biomass and lipid contents were found in Scenedesmus sp., Chlorella sp., and Chlamydomonas sp. when grown in normal BG-11 containing sodium carbonate concentration at 0.03 g · L(-1) , and in normal BG-11 containing iron concentration at 0.009 or 0.012 g · L(-1) . Increasing the sodium nitrate level increased the biomass content, but decreased the lipid content in all three microalgae...
May 18, 2017: Journal of Phycology
https://www.readbyqxmd.com/read/28511731/dietary-nitrate-and-blood-pressure-evolution-of-a-new-nutrient
#3
Ann Ashworth, Raul Bescos
Dietary nitrate is mainly obtained from vegetables, especially green leafy vegetables and beetroot. As a result of early research, dietary nitrate is currently viewed as a contaminant linked to increased risks of stomach cancer and methaemoglobinaemia. Consequently, nitrate levels are restricted in certain vegetables and in water supplies to ensure exposure levels remain below an acceptable daily intake of 3·7 mg/kg per d. The average nitrate intake in the UK is approximately 70 mg/d, although some population groups, such as vegetarians, may consume three times that amount...
May 17, 2017: Nutrition Research Reviews
https://www.readbyqxmd.com/read/28509762/beetroot-juice-increases-human-muscle-force-without-changing-ca2-handling-proteins
#4
Jamie Whitfield, Daniel Gamu, George J F Heigenhauser, Luc J C van Loon, Lawrence L Spriet, A Russell Tupling, Graham P Holloway
Dietary inorganic nitrate (NO3) supplementation improves skeletal muscle (SkM) contractile efficiency, and while rodent literature has suggested improvements in calcium handling or redox modifications as likely explanations, the direct mechanism-of-action in humans remains unknown. PURPOSE: To examine the effects of 7-d of beetroot juice (BRJ) supplementation on SkM contractile characteristics and function. METHODS: Recreationally active males (n=8) underwent transcutaneous electrical muscle stimulation of the vastus lateralis for evaluation of contractile characteristics before (pre) and after (post) 7-d of BRJ supplementation (280 mL/day, ~26 mmol NO3)...
May 15, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28476923/acute-beetroot-juice-supplementation-on-sympathetic-nerve-activity-a-randomized-double-blind-placebo-controlled-proof-of-concept-study
#5
Karambir Notay, Anthony V Incognito, Philip J Millar
Acute dietary nitrate supplementation reduces resting blood pressure in healthy normotensives. This response is attributed to increased nitric oxide bioavailability and peripheral vasodilation, though nitric oxide also tonically inhibits central sympathetic outflow. We hypothesized that acute dietary nitrate (NO3(-)) supplementation using beetroot (BR) juice would reduce blood pressure and muscle sympathetic nerve activity (MSNA) at rest and during exercise. Fourteen participants (7 men, 25±10 years) underwent blood pressure and MSNA measurements before and after (165-180 minutes) ingestion of 70ml high-nitrate (~6...
May 5, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28475992/enhanced-biodiesel-production-through-phyco-myco-co-cultivation-of-chlorella-minutissima-and-aspergillus-awamori-an-integrated-approach
#6
Archana Dash, Rintu Banerjee
Algae-fungus co-culture was investigated as an alternative biodiesel feedstock. An oleaginous filamentous fungus Aspergillus awamori was co-cultured with Chlorella minutissima MCC 27 and Chlorella minutissima UTEX 2219, respectively in N11 medium furnished with different carbon and nitrogen sources. The biomass and lipid production potential of the two C. minutissima-A. awamori co-cultures was compared against the monocultures. A substantial enhancement in biomass and lipid accumulation was observed in both the co-cultures...
April 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28473807/fnrl-and-three-dnr-regulators-are-used-for-the-metabolic-adaptation-to-low-oxygen-tension-in-dinoroseobacter-shibae
#7
Matthias Ebert, Sebastian Laaß, Andrea Thürmer, Louisa Roselius, Denitsa Eckweiler, Rolf Daniel, Elisabeth Härtig, Dieter Jahn
The heterotrophic marine bacterium Dinoroseobacter shibae utilizes aerobic respiration and anaerobic denitrification supplemented with aerobic anoxygenic photosynthesis for energy generation. The aerobic to anaerobic transition is controlled by four Fnr/Crp family regulators in a unique cascade-type regulatory network. FnrL is utilizing an oxygen-sensitive Fe-S cluster for oxygen sensing. Active FnrL is inducing most operons encoding the denitrification machinery and the corresponding heme biosynthesis. Activation of gene expression of the high oxygen affinity cbb3-type and repression of the low affinity aa3-type cytochrome c oxidase is mediated by FnrL...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28469601/comparative-genomics-and-transcriptional-analysis-of-flavobacterium-columnare-strain-atcc-49512
#8
Hasan C Tekedar, Attila Karsi, Joseph S Reddy, Seong W Nho, Safak Kalindamar, Mark L Lawrence
Flavobacterium columnare is a Gram-negative fish pathogen causing columnaris disease in wild and cultured fish species. Although the pathogen is widespread in aquatic environments and fish worldwide, little is known about biology of F. columnare and mechanisms of columnaris disease pathogenesis. Previously we presented the complete genome sequence of F. columnare strain ATCC 49512. Here we present a comparison of the strain ATCC 49512 genome to four other Flavobacterium genomes. In this analysis, we identified predicted proteins whose functions indicate F...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28463771/enhancing-denitrification-using-a-novel-in-situ-membrane-biofilm-reactor-ismbfr
#9
Yonghong Wu, Yizhou Li, Aura Ontiveros-Valencia, Luis Ordaz-Díaz, Junzhuo Liu, Chen Zhou, Bruce E Rittmann
The insufficient supply of electron donor in surface water contaminated with nitrate leads to its incomplete reduction in natural or constructed wetlands. Although the addition of organic matter (represented as chemical oxygen demand, COD) can stimulate N removal by denitrification, direct supplementation of COD creates unacceptable risks to effluent quality. An alternative for stimulating denitrification is supplying hydrogen gas (H2) as an inorganic electron donor. We evaluate an innovative means to do H2-based denitrification of surface waters in a wetland setting: the in-situ membrane biofilm reactor (isMBfR), in which H2 is delivered to a biofilm of denitrifying bacteria on demand based on the presence of nitrate...
April 25, 2017: Water Research
https://www.readbyqxmd.com/read/28460182/effect-of-acute-nitrate-and-citrulline-supplementation-on-muscle-microvascular-response-to-ischemia-reperfusion-in-healthy-humans
#10
Thibault Le Roux-Mallouf, Florence Vibert, Stéphane Doutreleau, Samuel Verges
Nitric oxide (NO) is implicated in vasomotor control mechanisms altering the diameter of the vessels under various physiological and pathological conditions. There are two main NO production pathways, one NO synthase (NOS) independent (nitrate-nitrite-NO) and the other is NOS dependent (citrulline-arginine-NO). The objective of the study was to evaluate the effect of acute nitrate and citrulline supplementation on post ischemic vascular response in healthy subjects. Fourteen subjects performed two leg vascular occlusion tests, 3 days apart...
May 1, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28455615/enhancement-of-antibiotic-productions-by-engineered-nitrate-utilization-in-actinomycetes
#11
Sitong Meng, Hang Wu, Lei Wang, Buchang Zhang, Linquan Bai
Nitrate is necessary for primary and secondary metabolism of actinomycetes and stimulates the production of a few antibiotics, such as lincomycin and rifamycin. However, the mechanism of this nitrate-stimulating effect was not fully understood. Two putative ABC-type nitrate transporters were identified in Streptomyces lincolnensis NRRL2936 and verified to be involved in lincomycin biosynthesis. With nitrate supplementation, the transcription of nitrogen assimilation genes, nitrate-specific ABC1 transporter genes, and lincomycin exporter gene lmrA was found to be enhanced and positively regulated by the global regulator GlnR, whose expression was also improved...
April 28, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28448172/the-macrophage-stimulating-anti-cancer-agent-rrx-001-protects-against-ischemia-reperfusion-injury
#12
Pedro Cabrales, Scott Caroen, Arnold Oronsky, Corey Carter, Jane Trepel, Thomas Summers, Tony Reid, Neil Oronsky, Michelle Lybeck, Bryan Oronsky
Introduction RRx-001, a clinical macrophage-stimulating anti-cancer agent that also produces nitric oxide (NO) was studied in a model of ischemia-reperfusion injury. Methods The production of NO is dependent on the oxygen tension because nitric oxide synthases convert l-arginine to NO and l-citrulline in the presence of O2. Since the P450 enzymes, which metabolize nitrate esters such as nitroglycerin are dependent on oxygen, the generation of 'exogenous' NO is also sensitive to alterations in tissue PO2. I/R injury was studied in a hamster chamber window, with compression of the periphery of the window for 1 hour to induce ischemia...
April 27, 2017: Expert Review of Hematology
https://www.readbyqxmd.com/read/28445231/the-effects-of-multi-day-vs-single-pre-exercise-nitrate-supplement-dosing-on-simulated-cycling-time-trial-performance-and-skeletal-muscle-oxygenation
#13
Edward Jo, Michelle Fischer, Alexandra T Auslander, Alan Beigarten, Bruce Daggy, Ken Hansen, Lisa Kessler, Adam Osmond, Hong Wang, Rachel Wes
A transient augmentation in the metabolic efficiency of skeletal muscle is the purported basis for dietary nitrate supplementation amongst competitive and recreational athletes alike. Previous studies support the ergogenic effects of nitrate supplementation as findings indicated improved microvascular blood flow, exercise economy, and performance with relatively short-term supplementation. As with most ergogenic aids, the optimum duration of supplementation prior to performance or competition, i.e. loading phase, is a critical determinant for efficacy...
April 18, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28438687/dietary-nitrite-supplementation-attenuates-cardiac-remodeling-in-l-name-induced-hypertensive-rats
#14
Kunihiro Sonoda, Kazuo Ohtake, Hiroyuki Uchida, Junta Ito, Masaki Uchida, Hideshi Natsume, Hazuki Tamada, Jun Kobayashi
Loss of nitric oxide (NO) bioavailability underlies the development of hypertensive heart disease. We investigated the effects of dietary nitrite on N(G)-nitro-l-arginine methyl ester (l-NAME)-induced hypertension. Sprague-Dawley rats were divided into five groups: an untreated control group, an l-NAME-treated group, and three other l-NAME-treated groups supplemented with 10 mg/L or 100 mg/L of nitrite or 100 mg/L of captopril in drinking water. After the 8-week experimental period, mean arterial blood pressure was measured, followed by sampling of blood and heart tissue for assessment of nitrite/nitrate levels in the plasma and heart, the plasma level of angiotensin II (AT II), and the heart transcriptional levels of AT II type 1 receptor (AT1R), transforming growth factor-β1 (TGF-β1), and connective tissue proteins such as type 1 collagen and fibronectin...
April 21, 2017: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/28430162/ameliorative-effects-and-possible-molecular-mechanism-of-action-of-black-ginseng-panax-ginseng-on-acetaminophen-mediated-liver-injury
#15
Jun-Nan Hu, Zhi Liu, Zi Wang, Xin-Dian Li, Lian-Xue Zhang, Wei Li, Ying-Ping Wang
Background: Frequent overdosing of acetaminophen (APAP) has become the major cause of acute liver injury (ALI). The present study aimed to evaluate the potential hepatoprotective effects of black ginseng (BG) on APAP-induced mice liver injuries and the underlying mechanisms of action were further investigated for the first time. Methods: Mice were treated with BG (300, 600 mg/kg) by oral gavage once a day for seven days. On the 7th day, all mice were treated with 250 mg/kg APAP which caused severe liver injury after 24 h and hepatotoxicity was assessed...
April 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28422539/the-effect-of-nitrate-supplementation-on-cycling-performance-in-the-heat-in-well-trained-cyclists
#16
Joseph A McQuillan, Julia R Casadio, Deborah K Dulson, Paul B Laursen, Andrew E Kilding
PURPOSE: The aim of this study was to determine the effect of NO3(-) consumption on measures of perception, thermoregulation and cycling performance in hot conditions. METHODS: Using a randomised, double-blind, crossover-design, 8 well-trained cyclists (mean ± SD: age: 25 ± 8 y, V̇O2peak: 64 ± 5 ml·kg(-1)·min(-1)) performed 2 separate trials, in hot (35°C, 60% relative humidity) environments, having ingested either 140 ml NO3(-)-rich beetroot juice ~8 mmol NO3(-) (NIT), or placebo (PLA), daily for 3-days with a 7-day washout period separating trials...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28390312/stimulation-of-long-term-ammonium-nitrogen-deposition-on-methanogenesis-by-methanocellaceae-in-a-coastal-wetland
#17
Leilei Xiao, Baohua Xie, Jinchao Liu, Hongxia Zhang, Guangxuan Han, Oumei Wang, Fanghua Liu
Atmospheric nitrogen deposition caused by human activities has been receiving much attention. Here, after long-term simulated ammonium and nitrate nitrogen deposition (NH4Cl, KNO3, and NH4NO3) in the Yellow River Delta (YRD), a sensitive coastal wetland ecosystem typified by a distinct wet and dry season, methane fluxes were measured, by adopting a closed static chamber technique. The results showed that deposition of ammonium nitrogen accelerated methane emissions all year round. Ammonium nitrogen deposition transformed the YRD from a methane sink into a source during the dry season...
October 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28384119/status-of-water-pollution-in-relation-to-industrialization-in-rajasthan
#18
Ritu Singh Rajput, Sonali Pandey, Seema Bhadauria
India is a large and densely populated country; its economy is largely agricultural. Making the best use of the country's manpower has always posed a challenge. Industrialization could become a dominant component of the economy and displace agriculture. Traditional livelihoods of occupational groups are threatened by the practice of disposing untreated industrial waste into rivers and bodies of water. These uncontrolled disposals impact local natural resources with negative long-term effects. Industrialization is the development of intellectual and financial trade that changes a predominantly rustic culture into a modern one...
April 6, 2017: Reviews on Environmental Health
https://www.readbyqxmd.com/read/28383668/copper-amine-oxidase-8-regulates-arginine-dependent-nitric-oxide-production-in-arabidopsis-thaliana
#19
Felicitas Groß, Eva-Esther Rudolf, Björn Thiele, Jörg Durner, Jeremy Astier
Nitric oxide (NO) is a key signaling molecule in plants, regulating a wide range of physiological processes. However, its origin in plants remains unclear. It can be generated from nitrite through a reductive pathway, notably via the action of the nitrate reductase (NR), and evidence suggests an additional oxidative pathway, involving arginine. From an initial screen of potential Arabidopsis thaliana mutants impaired in NO production, we identified copper amine oxidase 8 (CuAO8). Two cuao8 mutant lines displayed a decreased NO production in seedlings after elicitor treatment and salt stress...
April 5, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28379423/depletion-of-carbohydrate-reserves-limits-nitrate-uptake-during-early-regrowth-in-lolium-perenne-l
#20
Qianqian Guo, Matthew Hamish Turnbull, Jiancheng Song, Jessica Roche, Ondrej Novak, Jana Späth, Paula Elizabeth Jameson, Jonathan Love
The mechanisms linking C/N balance to N uptake and assimilation are central to plant responses to changing soil nutrient levels. Defoliation and subsequent regrowth of grasses both impact C partitioning, thereby creating a significant point of interaction with soil N availability. Using defoliation as an experimental treatment, we investigated the dynamic relationships between plant carbohydrate status and NO3--responsive uptake systems, transporter gene expression, and nitrate assimilation in Lolium perenne L...
March 1, 2017: Journal of Experimental Botany
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