Pith Number

pith:PXWFVVF6

pith:1999:PXWFVVF6UNMLXPQF7P4DKHTSKK

1 verified not anchored not stored refs pending

Effective interaction between helical bio-molecules

E.Allahyarov, H.Loewen

Simulations of helical DNA show that effective forces between strands switch between attraction and repulsion depending on their relative twist and can strengthen or weaken nonmonotonically with added salt.

arxiv:physics/9912053 v1 · 1999-12-29 · physics.bio-ph · physics.chem-ph · physics.comp-ph · q-bio

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\usepackage{pith}
\pithnumber{PXWFVVF6UNMLXPQF7P4DKHTSKK}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

✓ Author claim 1 verified · sign in to claim

Elshad Allahyarov orcid verified

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

the sign of the force depends sensitively on the relative orientation. For intermolecular distances smaller than 6Å it can be both attractive and repulsive. Furthermore we report a nonmonotonic behaviour of the effective force for increasing salt concentration.

C2weakest assumption

The primitive model of electrolytes with an explicit double-helix charge pattern sufficiently captures the nonlinear screening physics of real B-DNA at the studied distances and salt concentrations.

C3one line summary

Simulations of explicit double-helix B-DNA charge patterns reveal orientation-dependent effective forces that switch sign below 6 Å and exhibit nonmonotonic salt dependence beyond linear Debye-Hückel screening.

Receipt and verification

First computed	2026-07-04T16:15:38.893987Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7dec5ad4bea358bbbe05fbf8351e7252a2973aa59c91c838fc1105354ec6bbcb

Aliases

arxiv: physics/9912053 · arxiv_version: physics/9912053v1 · doi: 10.48550/arxiv.physics/9912053 · pith_short_12: PXWFVVF6UNML · pith_short_16: PXWFVVF6UNMLXPQF · pith_short_8: PXWFVVF6

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/PXWFVVF6UNMLXPQF7P4DKHTSKK \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 7dec5ad4bea358bbbe05fbf8351e7252a2973aa59c91c838fc1105354ec6bbcb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "850e89902fb82b42feadae0808eab730f0c0101075f7d58391fb2a19a2bae4b2",
    "cross_cats_sorted": [
      "physics.chem-ph",
      "physics.comp-ph",
      "q-bio"
    ],
    "license": "",
    "primary_cat": "physics.bio-ph",
    "submitted_at": "1999-12-29T17:05:26Z",
    "title_canon_sha256": "5b7eeea8906ee62cd913a5b8c5df0007aaa1d92b2f26f580d9daa1c7e673f448"
  },
  "schema_version": "1.0",
  "source": {
    "id": "physics/9912053",
    "kind": "arxiv",
    "version": 1
  }
}