Salmonella Enteritidis survival in different temperatures and nutrient solution pH levels in hydroponically grown lettuce

2021 ◽  
pp. 103898
Author(s):  
Panayiota Xylia ◽  
Antonios Chrysargyris ◽  
George Botsaris ◽  
Panagiotis Skandamis ◽  
Nikolaos Tzortzakis
Keyword(s):  
Nutrient Solution ◽  
Salmonella Enteritidis ◽  
Solution Ph ◽  
Different Temperatures ◽  
Hydroponically Grown

scholarly journals Tuber Initiation in Hydroponically Grown Potatoes by Alteration of Solution pH

HortScience ◽  
1994 ◽  
Vol 29 (6) ◽  
pp. 621-623 ◽  
Author(s):  
Waylen Y. Wan ◽  
Weixing Cao ◽  
Theodore W. Tibbitts
Keyword(s):  
Tissue Culture ◽  
Mineral Composition ◽  
Nutrient Solution ◽  
Solution Culture ◽  
Tuber Initiation ◽  
Solution Ph ◽  
Constant Ph ◽  
Leaf Tissues ◽  
Hydroponically Grown ◽  
Potato Plantlets

Because tuberization in potatoes (Solarium tuberosum L.) reportedly is inhibited when stolons are immersed in liquid, this study was conducted to determine the effect of intermittent pH reductions of the nutrient solution on tuber induction of potatoes in solution culture. Tissue-culture potato plantlets were transplanted into solutions maintained at pH 5.5. The pH of the nutrient solution was changed to 3.5 and 4.0 for 10 hours on each of three dates (30, 35, and 40 days after transplanting). For the pH 3.5 treatment, tubers were observed first on day 42 and averaged 140 tubers per plant at harvest on day 54. For the pH 4.0 treatment, tubers were observed first on day 48 and averaged 40 tubers per plant at harvest. At a constant pH 5.5, tubers were observed on day 52 and averaged two tubers per plant at harvest. Plants with the intermittent pH 3.5 had smaller shoots and roots with shorter and thicker stolons compared to constant pH 5.5. With the intermittent pH 4.0, plants were of similar size, but stolons were shorter and slightly thickener compared to those from pH 5.5. Mineral composition of leaf tissues at harvest was similar for the three pH treatments. These results indicate that regulation of solution pH can be a useful technique for inducing tuberization in potatoes.

Effects of aluminum on nutrient solution pH and nitrate/ammonium uptake by triticale

1997 ◽  
Vol 20 (10) ◽  
pp. 1391-1401 ◽  
Author(s):  
A. M. G. Antunes ◽  
M. Antonieta Nunes
Keyword(s):  
Nutrient Solution ◽  
Ammonium Uptake ◽  
Solution Ph

POTASSIUM-SODIUM SELECTIVITY OF SUNFLOWER AS INFLUENCED BY CALCIUM SUPPLY UNDER SALINE CONDITIONS / SELECTIVIDAD DEL GIRASOL RESPECTO AL POTASIO Y SODIO BAJO LA INFLUENCIA DE LA PROVISION DEL POTASIO Y LAS CONDITIONES DE SALINIDAD / SÉLECTIVITÉ DU TOURNESOL EN CE QUI CONCERNE LE POTASSIUM ET LE SODIUM SOUS L’EFFET DE L’APPPORT DE CALCIUM DANS DES CONDITIONS SALINES

Helia ◽  
2001 ◽  
Vol 24 (34) ◽  
pp. 121-130
Author(s):  
Arshad Ali ◽  
M. Salim Badr-u-Zaman ◽  
Rahmatullah Badr-u-Zaman
Keyword(s):  
Nutrient Solution ◽  
Block Design ◽  
High Concentration ◽  
Solution Ph ◽  
Positive Role ◽  
Low Concentration ◽  
Salinity Levels ◽  
Half Strength ◽  
Calcium Supply ◽  
Hydroponic Study

SUMMARY A hydroponic study was conducted to investigate the influence of Ca supply on K+/Na+ selectivity of sunflower at 0, 75 and 150 mM NaCl in root medium. Sunflower (Helianthus annuus L. cv. Hysun-33) seeds were germinated in moist quartz sand and twelve-day old seedlings were foam-plugged in lids of plastic pots each containing 2.5 l of continuously aerated half strength Hoagland's nutrient solution without calcium salts. The solution pH was adjusted to 5.9 by adding HCl and NaOH. There were three salinity levels (0, 75 and 150 mM NaCl) and two calcium levels (5 and 10 mM CaCl2). The experiment was organized in a randomized complete block design (RCBD) in three replicates. At low concentration of calcium (5 mM), sunflower growth decreased drastically with increasing concentration of NaCl in nutrient solution. On the other hand, plants grown in high concentration of NaCl experienced less damage with relatively higher concentration of calcium. At relatively higher concentration of calcium (10 mM Ca), sunflower plants absorbed and translocated relatively more potassium and less sodium, than at low concentration of calcium (5 mM Ca), demonstrating the positive role of calcium in alleviating the hazardous effects of salinity on sunflower growth.

scholarly journals Stability Study of Simvastatin under Hydrolytic Conditions Assessed by Liquid Chromatography

2005 ◽  
Vol 88 (6) ◽  
pp. 1631-1636 ◽  
Author(s):  
Alejandro Álvarez-Lueje ◽  
Christian Valenzuela ◽  
Juan Arturo Squella ◽  
Luis Joaquín Núñez-Vergara
Keyword(s):  
Liquid Chromatography ◽  
Phosphate Buffer Solution ◽  
Stability Study ◽  
Buffer Solution ◽  
Solution Ph ◽  
Column Temperature ◽  
Stability Indicating Method ◽  
First Order Kinetics ◽  
Kinetic Rate Constants ◽  
Different Temperatures

Abstract In this work, a liquid chromatography stability-indicating method was developed and applied to study the hydrolytic behavior of simvastatin in different pH values and temperatures. The selected chromatographic conditions were a C18 column; acetonitrile–28 mM phosphate buffer solution, pH 4 (65 + 35) as the mobile phase; 251°C column temperature; and flow rate 1 mL/min. The developed method exhibited an adequate repeatability and reproducibility (coefficient of variation 0.54 and 0.74%, respectively) and a recovery higher than 98%. Furthermore, the detection and quantification limits were 9.1 × 10−7 and 2.8 × 10−6 M, respectively. The degradation of simvastatin fitted to pseudo-first order kinetics. The degradation was pH dependent, being much higher at alkaline pH than at acid pH. Activation energy, kinetic rate constants (k) at different temperatures, the half life (t1/2) and the time for 10% degradation to occur (t90) values are also reported.

Effect of pH and Concentration of Ca2+ on Spherical Calcium Carbonate Crystallization by Continuous CO2 Gas Bubbling into Phosphogypsum Leaching Solution

2015 ◽  
Vol 814 ◽  
pp. 552-558
Author(s):  
Ya Qing Liang ◽  
Hong Juan Sun ◽  
Tong Jiang Peng
Keyword(s):  
Grain Size ◽  
Calcium Carbonate ◽  
Particle Dispersion ◽  
Ion Concentration ◽  
High Grade ◽  
Solution Ph ◽  
Salt Leaching ◽  
Novel Approach ◽  
Different Temperatures ◽  
Leaching Solution

Spherical calcium carbonate (CaCO3) is a potential component in many industrial fields such as high-grade papermaking, high-grade painting, environment, and pesticide. This paper describes a novel approach to synthesize spherical calcium carbonate (CaCO3) particles via passing CO2 bubbles into phosphogypsum salt leaching solution (CaSO4) in the presence of ammonia (NH3) at different temperatures. The influence of the initial solution pH and concentration of calcium ions on the polymorph and morphology of CaCO3 was studied. The physical characteristics of the precipitate were evaluated using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that compared with different calcium sources the phase and morphology of CaCO3 synthesized by phosphogysum leaching solution had some regularity. The grain size of spherical CaCO3 became bigger, surface became smoother, and particle dispersion became better with the increase of calcium ion concentration. The content of vaterite increased and particle grain size changed a little with the increase of pH. The research results had important environmental significance for phosphogysum resource utilization and CO2 fixation.

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