diff --git a/identifiers.tsv b/identifiers.tsv
index 8f60629052ad73bf1dea90b6d8ce047d3f1fa800..ce8b3afecbaa680752712df69b458227a9af200d 100644
--- a/identifiers.tsv
+++ b/identifiers.tsv
@@ -3345,3 +3345,5 @@ id	na_id	identifier	context_id	context_pid	canonical_url	ticket	ts_md_fetch	ts_d
 	1	10.25365/phaidra.640	1		https://phaidra.univie.ac.at/o:2118675	37573	2025-02-17T071913Z	2025-02-17T071913Z	
 	1	10.25365/phaidra.641	1		https://phaidra.univie.ac.at/o:2120031	37574	2025-02-25T144413Z	2025-02-25T144413Z	
 	1	10.25365/phaidra.642	1		https://phaidra.univie.ac.at/o:2118777	37578	2025-02-17T132728Z	2025-02-17T132728Z	
+	1	10.25365/phaidra.643	1		https://phaidra.univie.ac.at/o:2120011	37652	2025-02-25T164604Z	2025-02-25T164604Z	
+	1	10.25365/phaidra.644	1		https://phaidra.univie.ac.at/o:2120012	37653	2025-02-25T164957Z	2025-02-25T164957Z	
diff --git a/metadata/phaidra/phaidra.643.xml b/metadata/phaidra/phaidra.643.xml
new file mode 100644
index 0000000000000000000000000000000000000000..393f288fd495840b5e96fd1d9fe1ce9820fc2c1d
--- /dev/null
+++ b/metadata/phaidra/phaidra.643.xml
@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<resource xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://datacite.org/schema/kernel-4" xsi:schemaLocation="http://datacite.org/schema/kernel-4 http://schema.datacite.org/meta/kernel-4/metadata.xsd">
+  <identifier identifierType="DOI">10.25365/phaidra.643</identifier>
+  <creators>
+    <creator>
+      <creatorName nameType="Personal">Maximilian Klein</creatorName>
+      <givenName>Maximilian</givenName>
+      <familyName>Klein</familyName>
+    </creator>
+    <creator>
+      <creatorName nameType="Personal">Angus S. Hilts</creatorName>
+      <givenName>Angus S.</givenName>
+      <familyName>Hilts</familyName>
+    </creator>
+    <creator>
+      <creatorName nameType="Personal">Ross T. Fennessy</creatorName>
+      <givenName>Ross T.</givenName>
+      <familyName>Fennessy</familyName>
+    </creator>
+    <creator>
+      <creatorName nameType="Personal">Nino Trattnig</creatorName>
+      <givenName>Nino</givenName>
+      <familyName>Trattnig</familyName>
+    </creator>
+    <creator>
+      <creatorName nameType="Personal">Thomas Stehrer-Polášek</creatorName>
+      <givenName>Thomas</givenName>
+      <familyName>Stehrer-Polášek</familyName>
+    </creator>
+    <creator>
+      <creatorName nameType="Personal">Simon K.-M. R. Rittmann</creatorName>
+      <givenName>Simon K.-M. R.</givenName>
+      <familyName>Rittmann</familyName>
+    </creator>
+    <creator>
+      <creatorName nameType="Personal">Christian Fink</creatorName>
+      <givenName>Christian</givenName>
+      <familyName>Fink</familyName>
+    </creator>
+  </creators>
+  <titles>
+    <title>Supplemental material to: Markerless mutagenesis enables isoleucine biosynthesis solely from threonine in Methanothermobacter marburgensis</title>
+  </titles>
+  <publisher>:none</publisher>
+  <publicationYear>2024</publicationYear>
+  <descriptions>
+    <description descriptionType="Other">Markerless mutagenesis enables isoleucine biosynthesis solely from threonine in Methanothermobacter marburgensis: Supplemental material</description>
+  </descriptions>
+  <resourceType resourceTypeGeneral="Text">PDFDocument</resourceType>
+  <language>eng</language>
+  <dates>
+    <date dateType="Created">2025-02-25T10:06:54.163Z</date>
+  </dates>
+  <subjects>
+    <subject>Fermentation</subject>
+    <subject>ÖFOS 2012 -- TECHNISCHE WISSENSCHAFTEN (2) -- Industrielle Biotechnologie (209) -- Industrielle Biotechnologie (2090) -- Fermentation (209005)</subject>
+    <subject>ÖFOS 2012 -- TECHNICAL SCIENCES (2) -- Industrial Biotechnology (209) -- Industrial Biotechnology (2090) -- Fermentation (209005)</subject>
+    <subject>Mikrobiologie</subject>
+    <subject>Microbiology</subject>
+    <subject>ÖFOS 2012 -- NATURWISSENSCHAFTEN (1) -- Biologie (106) -- Biologie (1060) -- Mikrobiologie (106022)</subject>
+    <subject>ÖFOS 2012 -- NATURAL SCIENCES (1) -- Biology (106) -- Biology (1060) -- Microbiology (106022)</subject>
+    <subject>Molekularbiologie</subject>
+    <subject>Molecular biology</subject>
+    <subject>ÖFOS 2012 -- NATURWISSENSCHAFTEN (1) -- Biologie (106) -- Biologie (1060) -- Molekularbiologie (106023)</subject>
+    <subject>ÖFOS 2012 -- NATURAL SCIENCES (1) -- Biology (106) -- Biology (1060) -- Molecular biology (106023)</subject>
+    <subject>Biotechnology</subject>
+    <subject>Synthetic Biology</subject>
+    <subject>Methanogenic archaea</subject>
+    <subject>Amino acid production</subject>
+  </subjects>
+  <sizes>
+    <size>615015 b</size>
+  </sizes>
+  <formats>
+    <format>application/pdf</format>
+  </formats>
+  <rightsList>
+    <rights rightsURI="http://creativecommons.org/licenses/by/4.0/">http://creativecommons.org/licenses/by/4.0/</rights>
+  </rightsList>
+</resource>
diff --git a/metadata/phaidra/phaidra.644.xml b/metadata/phaidra/phaidra.644.xml
new file mode 100644
index 0000000000000000000000000000000000000000..89926dd9925a90a335ad0267eaae5e286d87adc2
--- /dev/null
+++ b/metadata/phaidra/phaidra.644.xml
@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<resource xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://datacite.org/schema/kernel-4" xsi:schemaLocation="http://datacite.org/schema/kernel-4 http://schema.datacite.org/meta/kernel-4/metadata.xsd">
+  <identifier identifierType="DOI">10.25365/phaidra.644</identifier>
+  <creators>
+    <creator>
+      <creatorName nameType="Personal">Maximilian Klein</creatorName>
+      <givenName>Maximilian</givenName>
+      <familyName>Klein</familyName>
+    </creator>
+    <creator>
+      <creatorName nameType="Personal">Angus S. Hilts</creatorName>
+      <givenName>Angus S.</givenName>
+      <familyName>Hilts</familyName>
+    </creator>
+    <creator>
+      <creatorName nameType="Personal">Ross T. Fennessy</creatorName>
+      <givenName>Ross T.</givenName>
+      <familyName>Fennessy</familyName>
+    </creator>
+    <creator>
+      <creatorName nameType="Personal">Nino Trattnig</creatorName>
+      <givenName>Nino</givenName>
+      <familyName>Trattnig</familyName>
+    </creator>
+    <creator>
+      <creatorName nameType="Personal">Thomas Stehrer-Polášek</creatorName>
+      <givenName>Thomas</givenName>
+      <familyName>Stehrer-Polášek</familyName>
+    </creator>
+    <creator>
+      <creatorName nameType="Personal">Simon K.-M. R. Rittmann</creatorName>
+      <givenName>Simon K.-M. R.</givenName>
+      <familyName>Rittmann</familyName>
+    </creator>
+    <creator>
+      <creatorName nameType="Personal">Christian Fink</creatorName>
+      <givenName>Christian</givenName>
+      <familyName>Fink</familyName>
+    </creator>
+  </creators>
+  <titles>
+    <title>Raw data to: Markerless mutagenesis enables isoleucine biosynthesis solely from threonine in Methanothermobacter marburgensis</title>
+  </titles>
+  <publisher>:none</publisher>
+  <publicationYear>2024</publicationYear>
+  <descriptions>
+    <description descriptionType="Other">Markerless mutagenesis enables isoleucine biosynthesis solely from threonine in Methanothermobacter marburgensis: Raw data</description>
+  </descriptions>
+  <resourceType resourceTypeGeneral="Other">Asset</resourceType>
+  <language>eng</language>
+  <dates>
+    <date dateType="Created">2025-02-25T10:14:42.839Z</date>
+  </dates>
+  <subjects>
+    <subject>Fermentation</subject>
+    <subject>ÖFOS 2012 -- TECHNISCHE WISSENSCHAFTEN (2) -- Industrielle Biotechnologie (209) -- Industrielle Biotechnologie (2090) -- Fermentation (209005)</subject>
+    <subject>ÖFOS 2012 -- TECHNICAL SCIENCES (2) -- Industrial Biotechnology (209) -- Industrial Biotechnology (2090) -- Fermentation (209005)</subject>
+    <subject>Mikrobiologie</subject>
+    <subject>Microbiology</subject>
+    <subject>ÖFOS 2012 -- NATURWISSENSCHAFTEN (1) -- Biologie (106) -- Biologie (1060) -- Mikrobiologie (106022)</subject>
+    <subject>ÖFOS 2012 -- NATURAL SCIENCES (1) -- Biology (106) -- Biology (1060) -- Microbiology (106022)</subject>
+    <subject>Molekularbiologie</subject>
+    <subject>Molecular biology</subject>
+    <subject>ÖFOS 2012 -- NATURWISSENSCHAFTEN (1) -- Biologie (106) -- Biologie (1060) -- Molekularbiologie (106023)</subject>
+    <subject>ÖFOS 2012 -- NATURAL SCIENCES (1) -- Biology (106) -- Biology (1060) -- Molecular biology (106023)</subject>
+    <subject>Biotechnology</subject>
+    <subject>Synthetic Biology</subject>
+    <subject>Methanogenic archaea</subject>
+    <subject>Amino acid production</subject>
+  </subjects>
+  <sizes>
+    <size>31418 b</size>
+  </sizes>
+  <formats>
+    <format>application/vnd.openxmlformats-officedocument.spreadsheetml.sheet</format>
+  </formats>
+  <rightsList>
+    <rights rightsURI="http://creativecommons.org/licenses/by/4.0/">http://creativecommons.org/licenses/by/4.0/</rights>
+  </rightsList>
+</resource>