Nucleus

The nucleus is the code-housing sub-lemniscate: the eukaryotic organelle whose double-membrane boundary encloses the genome and at which the central-dogma morphism composition (DNA → RNA → protein) is initiated. It is the τ-categorical home of the chromatin partition.

Categorical invariant. Sub-lemniscate housing the genome and the inception of central-dogma morphism composition; canonical site of chromatin partition.

Primary registry anchor: VI.D78

Supporting items: VI.D33, VI.D40, VI.P15, VI.D34

1. I.K0 — Universe Postulate
2. VI.D15 — Life Sector
3. VI.D33 — Lemniscate boundary morphism — applied as nuclear envelope
4. VI.D40 — BSD-motivic structure of the genetic code provides the code object the nucleus must enclose
5. VI.P15 — Central dogma as morphism composition — initiated at the nuclear interior
6. VI.D78 — Chromatin Partition — the τ-canonical sub-structure inside the nucleus

Biomarker: Double-membrane nuclear envelope with nuclear pore complexes; nuclear lamina (lamin A/B/C); chromatin (euchromatin/heterochromatin partition); nucleolus; histone H3K4me3/H3K27me3 marks.

Measurable range: Nucleus diameter 5-20 µm; nuclear pore density 10-20/µm²; nuclear envelope thickness ~40 nm (with perinuclear space); chromatin compaction ratio 10⁴-10⁵.

Observation method: DAPI/Hoechst staining, immunofluorescence for lamins, Hi-C chromatin conformation capture, ChIP-seq for histone marks, electron tomography of nuclear pores.

Calibration anchor: LG-Y02-kinetic-pseudoscalar-channel

Anchor chain:

1. VI.L18 chirality channel (life anchor)
2. DNA right-handed B-form helix as chirality fingerprint
3. histone-DNA interactions preserve handedness across packaging levels

Manuscript reference: manuscript-sources/book-06/part06/ch34-eukarya-regime.tex

Status: Planned

Related glossary entries

• LG-S01-cell The Cell
• LG-S03-organelle Organelle

Referenced by

• LG-S07-chromosome Chromosome
• LG-S09-genome Genome