Reply to Morel: Cadmium as a micronutrient and macrotoxin in the oceans.
نویسندگان
چکیده
We propose that the ubiquitous process of Cd homeostasis is likely to outweigh any physiological use of Cd (in place of Zn) in driving oceanic Cd cycling. This is based on the observation that, in our experiments, the Cd-isotopic composition of cultured microbes was independent of the presence/absence of the CdCA1 metalloenzyme (Cd carbonic anhydrase; the only known biochemical function for Cd). Whole-cell Cd-isotope compositions were quantitatively driven by the intracellular sequestration of isotopically light Cd to cell membranes (2). We interpret this sequestration as evidence of microbial Cd homeostasis, which is a ubiquitous and highly conserved process across all forms of life.
منابع مشابه
Cadmium Isotope Variations in the Oceans
A number of previous studies have identified considerable mass dependent variations in the Cd isotope compositions of both terrestrial and extraterrestrial samples. On Earth, stable isotope effects for Cd are particularly prominent in the oceans, and the largest natural terrestrial Cd isotope fractionations of about 4‰ have been reported for Cd-depleted surface seawater. These effects have gene...
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ورودعنوان ژورنال:
- Proceedings of the National Academy of Sciences of the United States of America
دوره 110 21 شماره
صفحات -
تاریخ انتشار 2013