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Littérature scientifique sur le sujet « Potassium nitrate|sub »

Auteur : Grafiati

Publié le 17 novembre 2023

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Articles de revues sur le sujet "Potassium nitrate|sub"

Dwiyono, Kisroh, et Maman Abdurachman Djauhari. « Effect of Potassium Nitrate (KNO₃) on Indonesian Konjac Productivity ». Universal Journal of Agricultural Research 9, n^o 2 (mars 2021) : 39–47. http://dx.doi.org/10.13189/ujar.2021.090202.

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Guzii, Sergii G., Ihar Bazhelka, Volodymyr Romaniuk et Svitlana Davydivna Lapovska. « Influence of Nitrate Species ANO3 ; and ANO3·nH2O on Physico-Mechanical Properties of the Aluminosilicate Adhesives for Wood and Wooden Structures ». Solid State Phenomena 325 (11 octobre 2021) : 143–49. http://dx.doi.org/10.4028/www.scientific.net/ssp.325.143.

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The article presents the results of studies of the effect of lithium, sodium, potassium and ammonium nitrates on the physical and mechanical properties of aluminosilicate adhesives intended for gluing wood and structures based on them. Nitrates were introduced into the aluminosilicate adhesive of composition Na2O·Al2O3·6SiO2·20H2O in amounts of 0.5, 1 and 1.5 wt. %. Changes in the shear strength along the fibers of substrates made of pine, beech, and oak wood were studied after 7 and 28 days of hardening of aluminosilicate adhesives in vivo. It is shown that for gluing pine wood it is most expedient to use adhesives containing lithium nitrate, potassium nitrate and ammonium nitrate is within 1.5 wt. %, the shearing strength along the fibers after 28 days of hardening is 1.7-1.8 times higher than the strength of the adhesive without additives. For gluing beech wood, it is most advisable to use adhesives containing potassium and ammonium nitrate in an amount of 1.5 wt. %, the shearing strength along the fibers after 28 days of hardening is 1.5 times lower than the strength of the adhesive without additives. For gluing oak wood, it is most advisable to use adhesives containing lithium nitrate, potassium nitrate and ammonium nitrate in amounts of 0.5 and 1.5 wt. %, the shear strength along the fibers increases by 1.3-1.5 times for 7 and 28 days of hardening compared to the strength of the adhesive without additives. According to the degree of influence on strength, modifying additives can be ranked in the series LiNO3×3H2O>KNO3>NH4NO3>NaNO3.

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Turan, Metin, et Yildrum Sezen. « Nitrate reductase activity in cabbage (Brassica oleracae var. capitata) seedlings affected by the different nitrogen fertilizer forms ». Acta Agrobotanica 57, n^o 1-2 (2013) : 41–48. http://dx.doi.org/10.5586/aa.2004.004.

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The effect of different nitrogen fertilizer (potassium nitrate, ammonium nitrate, ammonium sulphate, urea and farmyard manure) on nitrate reductase activity in cabbage (Brassica oleracea var. capitata) seedlings were studied. pH of the plant growth niedia was higher in the nitrate fertilizer treatment than the ammonium and other fertilizer forms. NO3--N application increased NRA in plant, but NH4+-N decreased NRA in plant. Harvesting date and different fertilizer doses increased NRA while NH4+-N decreased plant nitrate uptake. There was a significant relationship between NRA and fertilizer types.

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Buczek, J. « Ammonium and potassium effect on nitrate assimilation in cucumber seedlings ». Acta Societatis Botanicorum Poloniae 48, n^o 2 (2015) : 157–69. http://dx.doi.org/10.5586/asbp.1979.014.

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The effect of ammonium present in the induction medium toghether with nitrate on the activity of nitrate reductase (NR), nitrite reductase (NiR), glutamic acid dehydrogenase (GDH) and absorption and accumulation of NO3- in cucumber seedlings were investigated. Maximum NR and NiR activity in the cotyledons was observed when seedlings were supplied with KNO3 as the sole source of nitrogen. When plants were supplied with NH4NO3 the presence of NH4+ in the induction medium repressed by about 50 per cent the activity of both reductases in the cotyledons. Addition of K+ to this medium abolished completely the inhibitory effect of NH4+. The effect of K+ cannot be replaced by that Na+ ions. On the other hand, ammonium has no effect on the level of NR activity in roots, while NiR was almost completely repressed. Under the experimental conditions ammonium, in the presence of nitrates, decreased the activity of GDH, but this diminution did not occur when the plants were supplied with K+ simultaneously. It has found that NH4+ ions reduced NO3- absorption but at the same time, the ratio of NO3- absorbed to that reduced was increased more than twice. The presumable mechanism of these phenomena is discussed.

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Feng, Nengjie, Jie Meng, Yang Wu, Chong Chen, Lei Wang, Lu Gao, Hui Wan et Guofeng Guan. « KNO3 supported on three-dimensionally ordered macroporous La0.8Ce0.2Mn1−xFexO3 for soot removal ». Catalysis Science & ; Technology 6, n^o 9 (2016) : 2930–41. http://dx.doi.org/10.1039/c5cy02025e.

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The KNO₃ supported on 3DOM La_0.8Ce_0.2Mn_1−xFe_xO₃ perovskites have been prepared and used for soot removal. The presence of potassium nitrate can accelerate the soot combustion at both low and high temperature. The catalysts exhibit high activities for soot combustion.

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Song, Menglu, Xiangui Yang et Gongying Wang. « Preparation of polycarbonate diols (PCDLs) from dimethyl carbonate (DMC) and diols catalyzed by KNO3/γ-Al2O3 ». RSC Advances 8, n^o 61 (2018) : 35014–22. http://dx.doi.org/10.1039/c8ra07141a.

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γ-Al₂O₃ loaded with potassium nitrate (KNO₃/Al₂O₃) catalysts were prepared, characterized and employed as a type of heterogenous solid base catalyst in the synthesis of polycarbonate (1,4-butane carbonate)-diol (PBC–OH) via the transesterification of dimethyl carbonate (DMC) and 1,4-butanediol (BD).

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Kula, E., A. Pešlová et P. Martinek. « Effects of nitrogen on growth properties and phenology of silver birch (Betula pendula Roth) ». Journal of Forest Science 58, No. 9 (23 octobre 2012) : 391–99. http://dx.doi.org/10.17221/109/2011-jfs.

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Effects of stress caused by differentiated inputs of nitrogen after the application of ammonium nitrate (NH4NO3) on silver birch (Betula pendula Roth) were monitored in a greenhouse. The applied ammonium nitrate did not affect pH values but increased differently the content of nitrogen in soil and leaves. With increased inputs of nitrogen the height and diameter increment of birch also decreased, budbreak was delayed and the autumn leaf-fall slowed down. Frost heaving of shoots occurred particularly in the lower half of the birch stem. With the increasing content of nitrogen in leaves the content of phosphorus decreased and the level of potassium increased.

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Borowski, Edward, et Sławomir Michałek. « The effect of foliar feeding of potassium salts and urea in spinach on gas exchange, leaf yield and quality ». Acta Agrobotanica 62, n^o 1 (2012) : 155–62. http://dx.doi.org/10.5586/aa.2009.018.

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In a pot experiment conducted in a phytotron, the effectiveness of foliar feeding of different potassium salts, with and without the addition of 0.5% CO(NH2)2, in spinach (Spinacia oleracea L.) was investigated. Potassium was applied 3 times in the form of 1% solutions KCl, KNO3, K2SO4 and C6H5K3O7•H2O, compared to water as the control treatment. The obtained results show that foliar feeding of potassium salts in spinach is an efficient method of supplementing the level of K+ in plants during vegetation. Plants fed with KNO3 had the highest content of potassium in leaves, and those fertilized with K2SO4, C6H5K3O7 × H2O and KCl had an only slightly lower potassium content. The application of potassium salts resulted in more intensive gas exchange in leaves (stomatal conductance, photosynthesis, transpiration) and, as a consequence of that, increased leaf yield. Potassium nitrate and citrate influenced most effectively the abovementioned processes. The treatment of spinach with potassium salts resulted in an increased content of protein, chlorophyll, carotenoids, nitrates and iron as well as a decreased content of vitamin C and calcium in leaves.

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Tzortzakis, N. G. « Potassium and calcium enrichment alleviate salinity-induced stress in hydroponically grown endives ». Horticultural Science 37, No. 4 (3 novembre 2010) : 155–62. http://dx.doi.org/10.17221/1/2010-hortsci.

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Salinity either of soil or of irrigation water causes disturbance in plant growth and nutrient balance and reduces crop yields. The effects of NaCl salinity and/or calcium or potassium level on the plant growth and severity of gray mold (Botrytis cinerea [De Bary] Whetzel) were investigated in endive (Cichorium endivia L., cv. Green Curled) grown with the nutrient film technique under greenhouse conditions during early spring. Plants were supplied with nutrient solutions containing 40 mmol/l of sodium chloride (NaCl) and/or 10 mmol/l potassium sulphate (K2SO4). Additionally, plants treated with foliar spray of 15 mmol/l calcium nitrate [(CaNO3)2] or distilled water. Salinity or K- and Ca-enrichment mainly affected the upper part of endive plants and reduced leaf area. However, when salinity combined with either K- or Ca-enrichment, the negative impact of salinity on plant growth was reversed. Salinized and/or K- and Ca-enriched, plants did not differ in plant biomass, leaf/root ratio, leaf fresh weight, leaf number, and root length. Salinity did not have any impacts on photosynthetic rate, stomatal conductance, and intercellular CO2 concentration. Indeed, photosynthetic rate and stomatal conductance increased with Ca foliar application and decreased with K while the opposite effects were observed for the intercellular CO2 concentration. Total nutrient uptake was reduced 2-fold in salt-treated plants compared to controls. No symptoms of tip-burn or blackheart were recorded throughout the experimental study. Endive grown in the nutrient film technique had tolerance to NaCl salinity, and this method could be used to exploit saline water in soilless culture. These findings also suggest that a proper management of the salt concentration of the nutrient solution plus external elemental enrichment may provide an efficient tool to improve the quality of leafy vegetables with little effect on yield.

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Todorovic, Nikola, Valdemar Stajer, Aleksandra Milovancev, Danijela Musulin Banjanin, Milijana Celarevic, Laszlo Ratgeber, Jozsef Betlehem et al. « The Effects of Nitrate-Based Nutritional Formula on Oxygen Saturation and Patient-Reported Outcomes in COVID-19 Patients : A Randomized Controlled Trial ». Current Topics in Nutraceutical Research 20, n^o 4 (13 avril 2022) : 720–24. http://dx.doi.org/10.37290/ctnr2641-452x.20:720-724.

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The main objective of this randomized controlled trial was to analyze the acute effects of a nitrate-based nutritional formula on peripheral oxygen saturation (SpO₂), patient-reported outcomes, and safety indices in patients with acute COVID-19 infection. The participants completing the protocol for the trial (n = 71) were allocated in a double-blind design to receive either a multicomponent nutritional formula (containing 1200 mg of potassium nitrate, 200 mg of magnesium, 50 mg of zinc, and 1000 mg of citric acid), or a placebo (2.5 g of inulin) during a 72-h monitoring period. All participants were requested to take an intervention (four capsules; weight of each capsule was ~2.5 g) every 4 h during the intervention period. A two-way mixed model ANOVA with repeated measures revealed a significant difference in SpO₂ between interventions (P = 0.007). As many as 30 out of 38 patients (78.9%) receiving nitrate-based nutritional formula, who all started the treatment with SpO₂ ≤ 95%, finished the intervention with SpO₂ of at least 95% at 72-h follow-up, whereas in the placebo group, 13 patients out of 33 (39.4%) finished the trial with SpO₂ of at least 95% (P < 0.05). The hospital admission rate after the 72-h follow-up was 21.1% in patients receiving nitrate-based formula compared to 33.3% in the placebo group (P = 0.25). The nitrate-based formula might be recognized as a potent strategy to tackle hypoxemia and concomitant features of the COVID-19 pandemic. In conclusion, it appears that the novel nitrated-based nutritional formulation described here was able to improve oxygen saturation and clinical outcomes in COVID-19 patients. Although the exact mechanism of action remains unknown, the nitrate-based formula might be recognized as a potent, safe, and convenient strategy to tackle hypoxemia and concomitant features of the COVID-19 pandemic.

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Thèses sur le sujet "Potassium nitrate|sub"

Masri, Ahlam El. « Influence de la modification de la surface des électrodes sur la réduction du monoxyde de carbone et l'oxydation de dialdéhydes et de dialcools ». Grenoble INPG, 1986. http://www.theses.fr/1986INPG0003.

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Sur Pt et Pt platine, la reduction de Co en milieu organique contenant de l'eau, conduit a la formation de methanol avec un rendement de 47% : co+4h**(+)+4e**(-)->ch::(3)oh. Le potentiel auquel a lieu cette reaction (-2,5 vvsag/ag**(+)10**(-2)m, est en accord aec une reduction simultanee de co et de h**(+) et une reaction entre les especes adsorbees sur l'electrode d'influence des adatomes sur les produits issus de l'oxydation du glyoxal et de l'ethylene glycol a ete etudiee en milieu hclo::(4) hclo::(4),n, h::(2)so::(4)2m et kno::(3)m de concentration de certaines especes, comme l'acide glyoxylique, varie enormement avec l'addition d'adatomes (ag, sn9 pour favoriser la formation d'acide formique par oxydation du glyoxal. L'oxydation de l'ethylene-glycol conduit esentiellement a la formation d'aldehyde ou d'acide formique sur electrode de pt

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Chapitres de livres sur le sujet "Potassium nitrate|sub"

Dalton, David R. « The Soil ». Dans The Chemistry of Wine. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190687199.003.0012.

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The widespread practices of viniculture (the study of production of grapes for wine) and oenology (the study of winemaking) affirm the generalization that grapevines have fewer problems with mineral deficiency than many other crops. Only occasionally is the addition of iron (Fe), phosphorus (P), magnesium (Mg), and manganese (Mn) supplements to the soil needed. Addition of potassium (K), zinc (Zn), and boron (B) to the soil is more common. And, of course, nitrogen (N) is critical for the production of proteins. Over the years, various transition metals (metals in groups three through twelve [3– 12] of the periodic table, Appendix 1) have been shown to be generally important. These groups include iron (Fe), magnesium (Mg), manganese (Mn), zinc (Zn), and copper (Cu). Many metals are bound to organic molecules that are important for life. Some of the metals, such as copper (Cu) and iron (Fe), are important in electron transport while others, including manganese (Mn) and iron (Fe), inhibit reactive oxygen (O) species (ROSs) that can destroy cells. Metals serve both to cause some reactions to speed up, called positive catalysis while caus¬ing others (e.g., unwanted oxidation) to slow down (negative catalysis). It is not uncommon to add nitrogen (N), in the form of ammonium salts such as ammonium nitrate (NH4NO3), as fertilizer to the soil in which the vines are growing. It is also common to increase the nitrogen (N) content in the soil by planting legumes (legumes have roots that are frequently colonized by nitrogen-fixing bacteria). Nitrogen- fixing bacteria convert atmospheric nitrogen (N2), which plants cannot use, to forms, such as ammonia (NH3) or its equivalent, capable of absorption by plants. Nitrogen, used in plant proteins, tends to remain in the soil after harvest or decomposition. With sufficient nitrogen present in the soil the growth cycle can begin again in the following season without adding too much fertilizer. In a more general sense, however, it is clear (as mentioned earlier) that the soil must be capable of good drainage so the sub-soil parts of the plant do not rot and it must be loose enough to permit oxygen to be available to the growing roots.

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