{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:M4KMOAA4RZW6BUMUM5TZ45O6HF","short_pith_number":"pith:M4KMOAA4","canonical_record":{"source":{"id":"1802.01879","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-02-06T10:41:47Z","cross_cats_sorted":["cond-mat.soft","physics.bio-ph"],"title_canon_sha256":"72e3da81e797dbf8f8d12f361fa36c3f477b2a97b63ede2b9422231e3ceb60fd","abstract_canon_sha256":"954dd7cff3787da233ce1f0f9a2bf96a7fba2520e2919097e97ad21974fbe2f4"},"schema_version":"1.0"},"canonical_sha256":"6714c7001c8e6de0d19467679e75de39634e16e6427cc0295e8605b12858ab24","source":{"kind":"arxiv","id":"1802.01879","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.01879","created_at":"2026-05-17T23:55:44Z"},{"alias_kind":"arxiv_version","alias_value":"1802.01879v2","created_at":"2026-05-17T23:55:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.01879","created_at":"2026-05-17T23:55:44Z"},{"alias_kind":"pith_short_12","alias_value":"M4KMOAA4RZW6","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_16","alias_value":"M4KMOAA4RZW6BUMU","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_8","alias_value":"M4KMOAA4","created_at":"2026-05-18T12:32:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:M4KMOAA4RZW6BUMUM5TZ45O6HF","target":"record","payload":{"canonical_record":{"source":{"id":"1802.01879","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-02-06T10:41:47Z","cross_cats_sorted":["cond-mat.soft","physics.bio-ph"],"title_canon_sha256":"72e3da81e797dbf8f8d12f361fa36c3f477b2a97b63ede2b9422231e3ceb60fd","abstract_canon_sha256":"954dd7cff3787da233ce1f0f9a2bf96a7fba2520e2919097e97ad21974fbe2f4"},"schema_version":"1.0"},"canonical_sha256":"6714c7001c8e6de0d19467679e75de39634e16e6427cc0295e8605b12858ab24","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:55:44.448015Z","signature_b64":"Jlg5VFWpS1obLojUjpi3T6V1qK8ATBy/KWwgMN1ETBNa0ECIZW0QhtT90rmAlvi6U9KLwpp564yfoEvyxOZUCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6714c7001c8e6de0d19467679e75de39634e16e6427cc0295e8605b12858ab24","last_reissued_at":"2026-05-17T23:55:44.447483Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:55:44.447483Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.01879","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:55:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5TM2r9WnLEVuGVqbwtWA9fc0Ej6qlPH9bzNMOfKacLlT5fG6o5YKp9KLTtUvl8z7OOXhIOxR2lKJWgTe3fTADw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T06:26:10.257558Z"},"content_sha256":"6f857625823bc223693806b6b15afe6b24902c6784490f2618402da11e730faa","schema_version":"1.0","event_id":"sha256:6f857625823bc223693806b6b15afe6b24902c6784490f2618402da11e730faa"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:M4KMOAA4RZW6BUMUM5TZ45O6HF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Effect of motility on the transport of bacteria populations through a porous medium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.soft","physics.bio-ph"],"primary_cat":"physics.flu-dyn","authors_text":"Adama Creppy, Carine Douarche, Eric Cl\\'ement, Harold Auradou, Maria Veronica D'Angelo","submitted_at":"2018-02-06T10:41:47Z","abstract_excerpt":"The role of activity on the hydrodynamic dispersion of bacteria in a model porous medium is studied by tracking thousands of bacteria in a microfluidic chip containing randomly placed pillars. We first evaluate the spreading dynamics of two populations of motile and non-motile bacteria injected at different flow rates. In both cases, we observe that the mean and the variance of the distances covered by the bacteria vary linearly with time and flow velocity, a result qualitatively consistent with the standard geometric dispersion picture. However, quantitatively, the motiles bacteria display a "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.01879","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:55:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"awhbuQFkiiWkRPbg6ZdYdRd5PvFHMXBypvFWNsK9+9P5KhQSMhLzPSmBpGLiaiqAoWfQCdJZXm2NySMGbnPwAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T06:26:10.257904Z"},"content_sha256":"c888c52ce00d6fefdee0166c603d1e470453ef12399acd0468bc43afa4453b7a","schema_version":"1.0","event_id":"sha256:c888c52ce00d6fefdee0166c603d1e470453ef12399acd0468bc43afa4453b7a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/M4KMOAA4RZW6BUMUM5TZ45O6HF/bundle.json","state_url":"https://pith.science/pith/M4KMOAA4RZW6BUMUM5TZ45O6HF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/M4KMOAA4RZW6BUMUM5TZ45O6HF/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-23T06:26:10Z","links":{"resolver":"https://pith.science/pith/M4KMOAA4RZW6BUMUM5TZ45O6HF","bundle":"https://pith.science/pith/M4KMOAA4RZW6BUMUM5TZ45O6HF/bundle.json","state":"https://pith.science/pith/M4KMOAA4RZW6BUMUM5TZ45O6HF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/M4KMOAA4RZW6BUMUM5TZ45O6HF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:M4KMOAA4RZW6BUMUM5TZ45O6HF","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"954dd7cff3787da233ce1f0f9a2bf96a7fba2520e2919097e97ad21974fbe2f4","cross_cats_sorted":["cond-mat.soft","physics.bio-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-02-06T10:41:47Z","title_canon_sha256":"72e3da81e797dbf8f8d12f361fa36c3f477b2a97b63ede2b9422231e3ceb60fd"},"schema_version":"1.0","source":{"id":"1802.01879","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.01879","created_at":"2026-05-17T23:55:44Z"},{"alias_kind":"arxiv_version","alias_value":"1802.01879v2","created_at":"2026-05-17T23:55:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.01879","created_at":"2026-05-17T23:55:44Z"},{"alias_kind":"pith_short_12","alias_value":"M4KMOAA4RZW6","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_16","alias_value":"M4KMOAA4RZW6BUMU","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_8","alias_value":"M4KMOAA4","created_at":"2026-05-18T12:32:37Z"}],"graph_snapshots":[{"event_id":"sha256:c888c52ce00d6fefdee0166c603d1e470453ef12399acd0468bc43afa4453b7a","target":"graph","created_at":"2026-05-17T23:55:44Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"The role of activity on the hydrodynamic dispersion of bacteria in a model porous medium is studied by tracking thousands of bacteria in a microfluidic chip containing randomly placed pillars. We first evaluate the spreading dynamics of two populations of motile and non-motile bacteria injected at different flow rates. In both cases, we observe that the mean and the variance of the distances covered by the bacteria vary linearly with time and flow velocity, a result qualitatively consistent with the standard geometric dispersion picture. However, quantitatively, the motiles bacteria display a ","authors_text":"Adama Creppy, Carine Douarche, Eric Cl\\'ement, Harold Auradou, Maria Veronica D'Angelo","cross_cats":["cond-mat.soft","physics.bio-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-02-06T10:41:47Z","title":"Effect of motility on the transport of bacteria populations through a porous medium"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.01879","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:6f857625823bc223693806b6b15afe6b24902c6784490f2618402da11e730faa","target":"record","created_at":"2026-05-17T23:55:44Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"954dd7cff3787da233ce1f0f9a2bf96a7fba2520e2919097e97ad21974fbe2f4","cross_cats_sorted":["cond-mat.soft","physics.bio-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-02-06T10:41:47Z","title_canon_sha256":"72e3da81e797dbf8f8d12f361fa36c3f477b2a97b63ede2b9422231e3ceb60fd"},"schema_version":"1.0","source":{"id":"1802.01879","kind":"arxiv","version":2}},"canonical_sha256":"6714c7001c8e6de0d19467679e75de39634e16e6427cc0295e8605b12858ab24","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6714c7001c8e6de0d19467679e75de39634e16e6427cc0295e8605b12858ab24","first_computed_at":"2026-05-17T23:55:44.447483Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:55:44.447483Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Jlg5VFWpS1obLojUjpi3T6V1qK8ATBy/KWwgMN1ETBNa0ECIZW0QhtT90rmAlvi6U9KLwpp564yfoEvyxOZUCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:55:44.448015Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.01879","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6f857625823bc223693806b6b15afe6b24902c6784490f2618402da11e730faa","sha256:c888c52ce00d6fefdee0166c603d1e470453ef12399acd0468bc43afa4453b7a"],"state_sha256":"3b2007d0b466fce819de92618e1e80f46acde61c8b0845993c8612bc7d8b7bf7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QcCppYxINQbzNVi/WPzU5ouiLeYZWY8nZBmGLWNI58HgqvyBL+3TBwJ8VFjbjtG6XKSqt91ROpy4PbKqsZjoCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T06:26:10.259858Z","bundle_sha256":"99397e5b8b5fa47c428eae82c86704f3804e7d818fee8ee4223a9d63d26bfd54"}}