scholarly journals An experimental study of magnesium-isotope fractionation in chlorophyll-a photosynthesis

2006 ◽  
Vol 70 (16) ◽  
pp. 4072-4079 ◽  
Author(s):  
Jay R. Black ◽  
Qing-zhu Yin ◽  
William H. Casey
Keyword(s):  
Experimental Study ◽  
Chlorophyll A ◽  
Isotope Fractionation ◽  
Magnesium Isotope

Magnesium Isotope Fractionation during Synthesis of Chlorophyll a and Bacteriochlorophyll a of Benthic Phototrophs in Hypersaline Environments

2019 ◽  
Vol 3 (6) ◽  
pp. 1073-1079 ◽  
Author(s):  
Yuta Isaji ◽  
Toshihiro Yoshimura ◽  
Daisuke Araoka ◽  
Junichiro Kuroda ◽  
Nanako O. Ogawa ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Isotope Fractionation ◽  
Bacteriochlorophyll A ◽  
Hypersaline Environments ◽  
Magnesium Isotope

scholarly journals Magnesium–Isotope Fractionation in Chlorophyll-a Extracted from Two Plants with Different Pathways of Carbon Fixation (C3, C4)

Molecules ◽  
2020 ◽  
Vol 25 (7) ◽  
pp. 1644
Author(s):  
Katarzyna Wrobel ◽  
Jakub Karasiński ◽  
Andrii Tupys ◽  
Missael Antonio Arroyo Negrete ◽  
Ludwik Halicz ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Chlorophyll A ◽  
Inductively Coupled Plasma ◽  
Isotope Fractionation ◽  
Carbon Fixation ◽  
High Resolution Mass Spectrometry ◽  
Reversed Phase ◽  
Garden Cress ◽  
Magnesium Isotope ◽  
Inductively Coupled

Relatively few studies have been focused so far on magnesium–isotope fractionation during plant growth, element uptake from soil, root-to-leaves transport and during chlorophylls biosynthesis. In this work, maize and garden cress were hydroponically grown in identical conditions in order to examine if the carbon fixation pathway (C4, C3, respectively) might have impact on Mg-isotope fractionation in chlorophyll-a. The pigment was purified from plants extracts by preparative reversed phase chromatography, and its identity was confirmed by high-resolution mass spectrometry. The green parts of plants and chlorophyll-a fractions were acid-digested and submitted to ion chromatography coupled through desolvation system to multiple collector inductively coupled plasma-mass spectrometry. Clear preference for heavy Mg-isotopes was found in maize green parts (∆26Mgplant-nutrient 0.65, 0.74 for two biological replicates, respectively) and in chlorophyll-a (∆26Mgchlorophyll-plant 1.51, 2.19). In garden cress, heavy isotopes were depleted in green parts (∆26Mgplant-nutrient (−0.87)–(−0.92)) and the preference for heavy isotopes in chlorophyll-a was less marked relative to maize (∆26Mgchlorophyll-plant 0.55–0.52). The observed effect might be ascribed to overall higher production of energy in form of adenosine triphosphate (ATP), required for carbon fixation in C4 compared to C3, which could reduce kinetic barrier and make equilibrium fractionation prevailing during magnesium incorporation to protoporphyrin ring.

Magnesium isotope fractionation by chemical diffusion in natural settings and in laboratory analogues

2012 ◽  
Vol 88 ◽  
pp. 1-18 ◽  
Author(s):  
Rahul Chopra ◽  
Frank M. Richter ◽  
E. Bruce Watson ◽  
Christian R. Scullard
Keyword(s):  
Isotope Fractionation ◽  
Chemical Diffusion ◽  
Magnesium Isotope ◽  
Natural Settings

Experimental study of the copper isotope fractionation between aqueous Cu(II) and covellite, CuS

2004 ◽  
Vol 209 (3-4) ◽  
pp. 259-269 ◽  
Author(s):  
S. Ehrlich ◽  
I. Butler ◽  
L. Halicz ◽  
D. Rickard ◽  
A. Oldroyd ◽  
...  
Keyword(s):  
Experimental Study ◽  
Isotope Fractionation ◽  
Copper Isotope

Why magnesium isotope fractionation is absent from basaltic melts under thermal gradients in natural settings

2019 ◽  
Vol 157 (7) ◽  
pp. 1144-1148
Author(s):  
Yingkui Xu ◽  
Dan Zhu ◽  
Xiongyao Li ◽  
Jianzhong Liu
Keyword(s):  
Isotope Fractionation ◽  
Isotope Effects ◽  
Isotopic Fractionation ◽  
Chemical Diffusion ◽  
Kinetic Isotope Effects ◽  
Thermal Gradients ◽  
Magnesium Isotopes ◽  
Magnesium Isotope ◽  
Natural Systems ◽  
Kinetic Isotope

AbstractLaboratory experiments have shown that thermal gradients in silicate melts can lead to isotopic fractionation; this is known as the Richter effect. However, it is perplexing that the Richter effect has not been documented in natural samples as thermal gradients commonly exist within natural igneous systems. To resolve this discrepancy, theoretical analysis and calculations were undertaken. We found that the Richter effect, commonly seen in experiments with wholly molten silicates, cannot be applied to natural systems because natural igneous samples are more likely to be formed out of partially molten magma and the presence of minerals adds complexity to the behaviour of the isotope. In this study, we consider two related diffusion-rate kinetic isotope effects that originate from chemical diffusion, which are absent from experiments with wholly molten samples. We performed detailed calculations for magnesium isotopes, and the results indicated that the Richter effect for magnesium isotopes is buffered by kinetic isotope effects and the total value of magnesium isotope fractionation can be zero or even undetectable. Our study provides a new understanding of isotopic behaviour during the processes of cooling and solidification in natural magmatic systems.

Magnesium isotope fractionation in silicate melts by chemical and thermal diffusion

2008 ◽  
Vol 72 (1) ◽  
pp. 206-220 ◽  
Author(s):  
Frank M. Richter ◽  
E. Bruce Watson ◽  
Ruslan A. Mendybaev ◽  
Fang-Zhen Teng ◽  
Philip E. Janney
Keyword(s):  
Thermal Diffusion ◽  
Isotope Fractionation ◽  
Silicate Melts ◽  
Magnesium Isotope

Magnesium-Isotope Fractionation During Plant Growth

2008 ◽  
Vol 42 (21) ◽  
pp. 7831-7836 ◽  
Author(s):  
Jay R. Black ◽  
Emanuel Epstein ◽  
William D. Rains ◽  
Qing-zhu Yin ◽  
William H. Casey
Keyword(s):  
Plant Growth ◽  
Isotope Fractionation ◽  
Magnesium Isotope
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