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            <gco:CharacterString>Cite this dataset as: Kellogg, R., Saito, M. A. (2021) Metal quotas (ratios of Metal:P) of the polar diatom Chaetoceros sp. RS19 in +Zn and +Co incubation studies from January 2020 (MM Saito project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2021-08-30 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.859211.1 [access date]</gco:CharacterString>
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        <gco:CharacterString>Metal quotas of the Ross Sea diatom isolate Chaetoceros RS19 measured via ICP-MS after growth in +Zn+Co media amendments. Dataset Description: &amp;lt;p&amp;gt;Metal quotas (ratios of Metal:P) of the Ross Sea diatom isolate Chaetoceros RS19 measured via ICP-MS after growth in +Zn+Co media amendments.&amp;lt;/p&amp;gt; Methods and Sampling: &amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Methodology:&amp;lt;/strong&amp;gt;&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Sampling and analytical procedures:&amp;lt;/strong&amp;gt;&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;em&amp;gt;Metal quotas&amp;lt;/em&amp;gt;&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Cellular&amp;amp;nbsp;metal&amp;amp;nbsp;quotas were measured by inductively coupled plasma mass spectrometry (ICP-MS). Biomass from replicate 25 mL double addition cultures of &amp;lt;em&amp;gt;Chaetoceros &amp;lt;/em&amp;gt;RS19 were pooled upon entering stationary phase and were centrifuged at 11,000 RPM (14,610 x g) for 40 minutes at 4°C. The cell pellet was resuspended in ~1 mL media and transferred to an acid-cleaned microcentrifuge tube. Cultures were centrifuged again for 30 min at 14,100 RPM (13,336 x g) at 4°C before the supernatant was discarded. Half of the remaining cell pellet was acidified in 800 mL of 5% nitric acid (Optima) containing 1 ppb indium for at least seven days while the other half was retained for proteomic analysis. Solids were removed by centrifugation. No attempt was made to remove extracellular metals by washing cells with additional metal chelators in order to minimize processing blanks. Quota determinations therefore include contributions from both intracellular and extracellular pools. Process blank digestions containing acid but no cells were performed in parallel. Digests were diluted by a factor of 9 with 5% nitric acid 1 ppb indium solution before being analyzed in duplicate on a Thermo ICAP-Q plasma mass spectrometer calibrated to a multi-element standard curve (Spex Certiprep) over a range of 1 – 20 ppb. Samples were analyzed in KED mode after an 85s sample uptake window and element mass windows were scanned 3 times during measurements. The 1 ppb indium internal standard was used to correct for variation in sample delivery and plasma suppression between samples. Process blanks were subtracted from measured concentrations. Phosphorus concentrations were also measured by ICP-MS simultaneously and were calibrated to a standard curve ranging from 100 – 3,200 ppb using a 1 ppm certified P stock (Alfa Aesar Specpure). The seawater media base used for all growth experiments was similarly analyzed via ICP-MS using a 1:10 dilution of media base into 5% nitric acid 1 ppb indium and analyzed as above to determine background media concentrations of total Zn and Co (0.7 nmol L&amp;lt;sup&amp;gt;-1 &amp;lt;/sup&amp;gt;and 0.1 nmol L&amp;lt;sup&amp;gt;-1&amp;lt;/sup&amp;gt;, respectively).&amp;lt;/p&amp;gt;</gco:CharacterString>
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        <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/award/646122.rdf" xlink:title="GBMF3782" xlink:actuate="onRequest">Funding provided by Gordon and Betty Moore Foundation: Marine Microbiology Initiative (MMI) Award Number: GBMF3782 Award URL: https://www.moore.org/grant-detail?grantId=GBMF3782</gmx:Anchor>
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        <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/award/724457.rdf" xlink:title="OCE-1657766" xlink:actuate="onRequest">Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1657766 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1657766</gmx:Anchor>
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        <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/award/765944.rdf" xlink:title="OCE-1658030" xlink:actuate="onRequest">Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1658030 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1658030</gmx:Anchor>
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        <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/award/785825.rdf" xlink:title="OCE-1736599" xlink:actuate="onRequest">Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1736599 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1736599</gmx:Anchor>
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        <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/award/786678.rdf" xlink:title="OCE-1850719" xlink:actuate="onRequest">Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1850719 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1850719</gmx:Anchor>
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