scholarly journals Comparing the Effects of Calcium and Magnesium Ions on Accumulation and Translocation of Cadmium in Rice

2021 ◽  
Author(s):  
Li Xiangying ◽  
Lang Teng ◽  
Tianling Fu ◽  
Tengbing He ◽  
Pan Wu
Keyword(s):  
Primary Source ◽  
Soil Nutrient ◽  
Rice Grain ◽  
Magnesium Ions ◽  
Important Food ◽  
Rice Plants ◽  
Hydroponic Experiment ◽  
Cd Transport ◽  
Calcium And Magnesium Ions ◽  
Different Parts

Abstract Rice is one of China's most important food crops, and it is considered the primary source of human exposure to cadmium (Cd) pollution. A hydroponic experiment was performed to investigate the effect of calcium (Ca) and magnesium (Mg) on the absorption, distribution, and translocation of Cd in rice. Under the concentration gradient of Ca, Mg, and Cd, the concentrations of Cd in rice tissues were determined. The results revealed that the existence of Ca and Mg in the environment could benefit rice growth and limit the accumulation and translocation of Cd in plants. Cd concentrations in rice plants were as orders: roots > stems > leaves ≈ panicles ≈ husks > grains. While Cd content in rice grains decreased significantly under high Ca and Mg concentrations, this pattern was not observed under low and medium concentrations. Ca2+ and Mg2+ ions significantly influenced the translocation of Cd in the environment-rice system. Under the Ca (Mg)-deficient and Ca (Mg)-rich conditions, the husk and panicle played an essential role in hindering Cd transport to the rice grain, respectively. At the same concentration, the effect of Ca on the decrease of Cd bioconcentration was greater than that of Mg. An apparent antagonism was observed between Cd and Ca (Mg) in different parts of the rice plant. Altogether, the results of this study indicate that it was possible to plant and grow rice in Cd-polluted soil and that the accumulation and translocation of Cd in rice plants could be reduced by optimizing soil nutrient elements.

The Role of Calcium and Magnesium Ions in Uptake of β-Amyloid Peptides by Microglial Cells

2006 ◽  
Vol 19 (3) ◽  
pp. 683-696 ◽  
Author(s):  
N. Choucair ◽  
V. Laporte ◽  
R. Levy ◽  
C. Tranchant ◽  
J.-P. Gies ◽  
...  
Keyword(s):  
Microglial Cells ◽  
Magnesium Ions ◽  
Amyloid Peptides ◽  
Β Amyloid ◽  
Calcium And Magnesium ◽  
Calcium And Magnesium Ions

scholarly journals RNA Sequencing Reveals Rice Genes Involved in Male Reproductive Development under Temperature Alteration

Plants ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 663
Author(s):  
Sudthana Khlaimongkhon ◽  
Sriprapai Chakhonkaen ◽  
Keasinee Tongmark ◽  
Numphet Sangarwut ◽  
Natjaree Panyawut ◽  
...  
Keyword(s):  
High Temperature ◽  
Rna Sequencing ◽  
Reproductive Development ◽  
Yield Reduction ◽  
World Population ◽  
Rice Grain ◽  
Wild Type ◽  
Rice Plants ◽  
Male Development ◽  
Temperature Conditions

Rice (Oryza sativa L.) is one of the most important food crops, providing food for nearly half of the world population. Rice grain yields are affected by temperature changes. Temperature stresses, both low and high, affect male reproductive development, resulting in yield reduction. Thermosensitive genic male sterility (TGMS) rice is sterile at high temperature and fertile at low temperature conditions, facilitating hybrid production, and is a good model to study effects of temperatures on male development. Semithin sections of the anthers of a TGMS rice line under low (fertile) and high (sterile) temperature conditions showed differences starting from the dyad stage, suggesting that genes involved in male development play a role during postmeiotic microspore development. Using RNA sequencing (RNA-Seq), transcriptional profiling of TGMS rice panicles at the dyad stage revealed 232 genes showing differential expression (DEGs) in a sterile, compared to a fertile, condition. Using qRT-PCR to study expression of 20 selected DEGs using panicles of TGMS and wild type rice plants grown under low and high temperature conditions, revealed that six out of the 20 selected genes may be unique to TGMS, while the other 14 genes showed common responses to temperatures in both TGMS and wild-type rice plants. The results presented here would be useful for further investigation into molecular mechanisms controlling TGMS and rice responses to temperature alteration.

USING MALIC ACID SOLUTIONS FOR THE HYDRATION OF VEGETABLE OILS AND LECITHIN PRODUCTION

2020 ◽  
Author(s):  
Л.А. МАРЧЕНКО ◽  
Т.Н. БОКОВИКОВА ◽  
Е.В. ЛИСОВАЯ ◽  
С.А. ИЛЬИНОВА ◽  
Е.П. ВИКТОРОВА
Keyword(s):  
Malic Acid ◽  
Complex Compounds ◽  
Point Of View ◽  
Magnesium Ions ◽  
Ph Values ◽  
Calcium And Magnesium ◽  
The Stability ◽  
The Cost ◽  
Calcium And Magnesium Ions

Исследована возможность применения яблочной кислоты (ЯК) в качестве гидратирующего агента для перевода негидратируемых форм фосфолипидов в гидратируемые. Выбор ЯК обусловлен ее стоимостью, которая в 1,5 раза меньше стоимости янтарной кислоты, широко применяемой в качестве гидратирующего агента, а также большей доступностью с точки зрения промышленного производства. Исследование процесса комплексообразования и определение состава комплексных соединений ЯК с ионами кальция и магния осуществляли методом потенциометрического титрования. Установлено, что внесение в раствор ЯК ионов кальция и магния приводит к снижению значений рН, что свидетельствует о наличии комплексообразования в указанных системах. Наиболее устойчивыми являются комплексы ионов кальция и магния с непротонированным лигандом при соотношении Ме2 : лиганд 1 : 1. В процессе комплексообразования ионы Ca2 и Mg2 вытесняют протоны только карбоксильных групп ЯК, которая с ионами кальция образует более устойчивые комплексы, чем с ионами магния. Показано, что устойчивость комплексов ЯК с ионами кальция и магния значительно выше, чем устойчивость комплексов фосфатидилсеринов и фосфатидных кислот с указанными ионами. Использование водных растворов ЯК в качестве гидратирующего агента позволит повысить эффективность процесса гидратации и увеличить выход фосфолипидов и, следовательно, готового продукта лецитина. The possibility of using malic acid (MA) as a hydrating agent for converting non-hydrated forms of phospholipids into hydrated ones has been investigated. The choice of MA is due to its cost, which is 1,5 times less than the cost of succinic acid, as well as greater availability from the point of view of industrial production. The study of the complexation process and determination of the composition of complex compounds of MA with calcium and magnesium ions was carried out by the method of potentiometric titration. It was found that the introduction of calcium and magnesium ions into the MA solution leads to a decrease in pH values, which indicates the presence of complexation in these systems. Complexes of calcium and magnesium ions with an unprotected ligand at a ratio of ME2 : ligand 1 : 1 are the most stable. In the process of complexing, Ca2 and Mg2 ions displace protons only of the carboxyl groups of MA, which forms more stable complexes with calcium ions than with magnesium ions. It is shown that the stability of MA complexes with calcium and magnesium ions is significantly higher than the stability of phosphatidylserine and phosphatidic acid complexes with these ions. Using water solutions of MA as a hydrating agent will increase the efficiency of the hydration process and increase the yield of phospholipids and, consequently, the finished product lecithin.

STUDIES CONCERNING THE DETERMINATION OF CALCIUM AND MAGNESIUM IONS IN THE DUMBRAVITA AREA DRINKING WATER (FOUNTAIN WATER)

2020 ◽  
Vol 34 (1) ◽  
pp. 17-24
Author(s):  
Aurica Pop ◽  
Keyword(s):  
Drinking Water ◽  
Water Samples ◽  
Photometric Method ◽  
Magnesium Ions ◽  
Precise Analysis ◽  
Calcium And Magnesium ◽  
Cost Efficient ◽  
Calcium And Magnesium Ions

The paper showcases research conducted with the purpose of determining the Ca2+ and Mg2+ ions in the drinking water (fountain water) of a common household located in Dumbravita, Maramures County, Romania. The photometric method was used for this goal, as well as a Calcium and Magnesium Photometer. This study argues about implementing cost efficient techniques and precise analysis in order to determine Ca and Mg ions in the water samples.

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