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<SAMPLE_SET>
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        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017590</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>418404</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing archaeon</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
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                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>32.35 N,119.42E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>JD_AOA_1</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/sep/15</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
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            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>5.0m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Jiang-Su, Jiang-Du</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016372" center_name="ISSCAS" alias="DRS016372">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017591</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>418404</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing archaeon</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
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                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
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                <VALUE>paddy field</VALUE>
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            <SAMPLE_ATTRIBUTE>
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                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>32.35 N,119.42E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
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                <VALUE>PRJDB2899</VALUE>
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                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
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                <TAG>sample name</TAG>
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                <VALUE>2011/sep/15</VALUE>
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                <VALUE>soil</VALUE>
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            <SAMPLE_ATTRIBUTE>
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                <VALUE>China: Jiang-Su, Jiang-Du</VALUE>
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        </SAMPLE_ATTRIBUTES>
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    <SAMPLE accession="DRS016373" center_name="ISSCAS" alias="DRS016373">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017592</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>418404</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing archaeon</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
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                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
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                <VALUE>paddy field</VALUE>
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            <SAMPLE_ATTRIBUTE>
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                <VALUE>0 to -20 cm</VALUE>
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                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
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                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
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                <VALUE>amoA gene obtained by PCR</VALUE>
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                <VALUE>2011/sep/15</VALUE>
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                <VALUE>5.0m</VALUE>
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            <SAMPLE_ATTRIBUTE>
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                <VALUE>China: Jiang-Su, Jiang-Du</VALUE>
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    <SAMPLE accession="DRS016374" center_name="ISSCAS" alias="DRS016374">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017593</PRIMARY_ID>
        </IDENTIFIERS>
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            <TAXON_ID>933470</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing bacterium</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
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                <VALUE>paddy field</VALUE>
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                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
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                <VALUE>PRJDB2899</VALUE>
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                <VALUE>amoA gene obtained by PCR</VALUE>
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                <TAG>sample name</TAG>
                <VALUE>JD_AOB_1</VALUE>
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                <VALUE>2011/sep/15</VALUE>
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                <VALUE>cropland</VALUE>
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                <VALUE>5.0m</VALUE>
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                <VALUE>soil</VALUE>
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            <SAMPLE_ATTRIBUTE>
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                <VALUE>China: Jiang-Su, Jiang-Du</VALUE>
            </SAMPLE_ATTRIBUTE>
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        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017594</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>933470</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing bacterium</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
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                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
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                <VALUE>PRJDB2899</VALUE>
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                <VALUE>amoA gene obtained by PCR</VALUE>
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                <VALUE>2011/sep/15</VALUE>
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                <VALUE>China: Jiang-Su, Jiang-Du</VALUE>
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        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017595</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>933470</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing bacterium</SCIENTIFIC_NAME>
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                <TAG>description</TAG>
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                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
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                <VALUE>PRJDB2899</VALUE>
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                <VALUE>amoA gene obtained by PCR</VALUE>
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                <VALUE>2011/sep/15</VALUE>
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                <VALUE>5.0m</VALUE>
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                <VALUE>China: Jiang-Su, Jiang-Du</VALUE>
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            <PRIMARY_ID label="BioSample ID">SAMD00017596</PRIMARY_ID>
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            <TAXON_ID>418404</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing archaeon</SCIENTIFIC_NAME>
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                <VALUE>amoA gene obtained by PCR</VALUE>
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                <TAG>biome</TAG>
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                <VALUE>China: Zhe-Jiang, Jia-Xing</VALUE>
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                <VALUE>amoA gene obtained by PCR</VALUE>
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                <VALUE>China: Zhe-Jiang, Jia-Xing</VALUE>
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            <PRIMARY_ID label="BioSample ID">SAMD00017598</PRIMARY_ID>
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            <TAXON_ID>418404</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing archaeon</SCIENTIFIC_NAME>
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                <VALUE>0 to -20 cm</VALUE>
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                <VALUE>30.38 N,120.46E</VALUE>
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                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
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                <TAG>bioproject id</TAG>
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                <VALUE>amoA gene obtained by PCR</VALUE>
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                <VALUE>2011/Nov/06</VALUE>
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                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
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                <VALUE>3.7m</VALUE>
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                <VALUE>soil</VALUE>
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                <VALUE>China: Zhe-Jiang, Jia-Xing</VALUE>
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            <PRIMARY_ID label="BioSample ID">SAMD00017599</PRIMARY_ID>
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            <TAXON_ID>933470</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing bacterium</SCIENTIFIC_NAME>
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                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
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                <VALUE>amoA gene obtained by PCR</VALUE>
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                <VALUE>2011/Nov/06</VALUE>
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                <VALUE>China: Zhe-Jiang, Jia-Xing</VALUE>
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            <PRIMARY_ID label="BioSample ID">SAMD00017600</PRIMARY_ID>
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            <TAXON_ID>933470</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing bacterium</SCIENTIFIC_NAME>
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            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>30.38 N,120.46E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>JX_AOB_2</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Nov/06</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>3.7m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Zhe-Jiang, Jia-Xing</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016382" center_name="ISSCAS" alias="DRS016382">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017601</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>933470</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing bacterium</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>30.38 N,120.46E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>JX_AOB_3</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Nov/06</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>3.7m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Zhe-Jiang, Jia-Xing</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016383" center_name="ISSCAS" alias="DRS016383">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017602</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>418404</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing archaeon</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>20.33 N,110.04E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>LZ_AOA_1</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Jul/06</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>4.0m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Guang-Dong, Lei-Zhou</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016384" center_name="ISSCAS" alias="DRS016384">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017603</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>418404</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing archaeon</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>20.33 N,110.04E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>LZ_AOA_2</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Jul/06</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>4.0m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Guang-Dong, Lei-Zhou</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016385" center_name="ISSCAS" alias="DRS016385">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017604</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>418404</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing archaeon</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>20.33 N,110.04E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>LZ_AOA_3</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Jul/06</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>4.0m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Guang-Dong, Lei-Zhou</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016386" center_name="ISSCAS" alias="DRS016386">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017605</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>933470</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing bacterium</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>20.33 N,110.04E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>LZ_AOB_1</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Jul/06</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>4.0m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Guang-Dong, Lei-Zhou</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016387" center_name="ISSCAS" alias="DRS016387">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017606</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>933470</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing bacterium</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>20.33 N,110.04E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>LZ_AOB_2</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Jul/06</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>4.0m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Guang-Dong, Lei-Zhou</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016388" center_name="ISSCAS" alias="DRS016388">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017607</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>933470</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing bacterium</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>20.33 N,110.04E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>LZ_AOB_3</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Jul/06</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>4.0m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Guang-Dong, Lei-Zhou</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016389" center_name="ISSCAS" alias="DRS016389">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017608</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>418404</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing archaeon</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>30.05 N,104.34E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>ZY_AOA_1</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Sep/05</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>400m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Si-Chuan, Zi-Yang</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016390" center_name="ISSCAS" alias="DRS016390">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017609</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>418404</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing archaeon</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>30.05 N,104.34E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>ZY_AOA_2</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Sep/05</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>400m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Si-Chuan, Zi-Yang</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016391" center_name="ISSCAS" alias="DRS016391">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017610</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>418404</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing archaeon</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>30.05 N,104.34E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>ZY_AOA_3</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Sep/05</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>400m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Si-Chuan, Zi-Yang</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016392" center_name="ISSCAS" alias="DRS016392">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017611</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>933470</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing bacterium</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>30.05 N,104.34E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>ZY_AOB_1</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Sep/05</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>400m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Si-Chuan, Zi-Yang</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016393" center_name="ISSCAS" alias="DRS016393">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017612</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>933470</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing bacterium</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>30.05 N,104.34E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>ZY_AOB_2</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Sep/05</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>400m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Si-Chuan, Zi-Yang</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
    <SAMPLE accession="DRS016394" center_name="ISSCAS" alias="DRS016394">
        <IDENTIFIERS>
            <PRIMARY_ID label="BioSample ID">SAMD00017613</PRIMARY_ID>
        </IDENTIFIERS>
        <SAMPLE_NAME>
            <TAXON_ID>933470</TAXON_ID>
            <SCIENTIFIC_NAME>uncultured ammonia-oxidizing bacterium</SCIENTIFIC_NAME>
        </SAMPLE_NAME>
        <SAMPLE_ATTRIBUTES>
            <SAMPLE_ATTRIBUTE>
                <TAG>description</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>feature</TAG>
                <VALUE>paddy field</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>depth</TAG>
                <VALUE>0 to -20 cm</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>lat_lon</TAG>
                <VALUE>30.05 N,104.34E</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>project_name</TAG>
                <VALUE>Differential contributions of ammonia oxidizers and nitrite oxidizers to nitrification in four paddy soils</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>bioproject id</TAG>
                <VALUE>PRJDB2899</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample comment</TAG>
                <VALUE>amoA gene obtained by PCR</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>sample name</TAG>
                <VALUE>ZY_AOB_3</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>collection_date</TAG>
                <VALUE>2011/Sep/06</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>biome</TAG>
                <VALUE>cropland</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>elev</TAG>
                <VALUE>400m</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>material</TAG>
                <VALUE>soil</VALUE>
            </SAMPLE_ATTRIBUTE>
            <SAMPLE_ATTRIBUTE>
                <TAG>geo_loc_name</TAG>
                <VALUE>China: Si-Chuan, Zi-Yang</VALUE>
            </SAMPLE_ATTRIBUTE>
        </SAMPLE_ATTRIBUTES>
    </SAMPLE>
</SAMPLE_SET>
