A primary cell culture precedes the first successful subculture.^[ref]

An oligosaccharide is a short chain of linked monosaccharides. Attached oligosaccharides can undergo Golgi cargo processing.

Online text: openstax.org/books/calculus-volume-3/pages/6-4-greens-theorem

This section belongs to the textbook whose senior contributing authors are Gilbert Strang and Edwin “Jed” Herman; no separate section byline is verified.

Cited passages: §6.4, Theorem 6.12 and equation (6.13): circulation form and hypotheses; the following proof: rectangle edge calculation and the fundamental theorem of calculus.

Section of Calculus Volume 2 by Gilbert Strang and others; no separate chapter author or section revision date is established.

Online text: openstax.org/books/calculus-volume-2/pages/5-2-infinite-series

Cited passages: §5.2, Telescoping Series, definition, finite partial-sum identities and finite-limit convergence criterion.

A buffer solution used as a running medium in DNA gel electrophoresis; it maintains pH while allowing electric current through the apparatus.

Phosphate-buffered saline is an aqueous salt solution containing phosphate species that act as a buffer solution, together with salts that control its ionic strength and osmotic properties. Common formulations are designed to maintain a near-neutral pH, but their precise composition varies.

The phosphate acid-base pair consumes added acid or base, limiting small pH shifts. The salt content makes the solution useful when biological samples need a controlled ionic environment. It does not reproduce every component of a physiological fluid, and added divalent ions can interact with phosphate; the formulation must therefore be specified when comparing experiments.

Cited passages: Thread-Safety; Overwrite Operation; Writing to a Full Buffer; Iterator Invalidation; Caveats. The documented overwrite-by-assignment and synchronization behavior belongs to Boost.Circular Buffer.

Transverse relaxation describes loss of ensemble transverse magnetization. It must not automatically be identified with pure dephasing. In a simple completely positive two-level relaxation model,where $T_{\varphi }$ describes additional pure dephasing. Thus population recovery itself contributes to transverse decay. A spread of static magnetic fields can further cancel ensemble phases without the same microscopic relaxation; an observed free signal may have an effective $T_2^{\ast }$ rather than homogeneous $T_2$. The simple exponential examples below assume a uniform field and a single homogeneous $T_2$.

With no transverse drive, the Bloch equations giveLongitudinal nuclear spin relaxation restores the population imbalance and thus the magnetization parallel to the static magnetic field. It corresponds to population relaxation for the two-level model. Starting from $M_z(0)=0$, waiting $T_1$ recovers $1-e^{-1}$ of $M_0$, whereas waiting $5T_1$ recovers about $99.3\%$. This is why repeated measurements require a recovery-time decision.

Online text: openstax.org/books/biology-2e/pages/10-1-cell-division

Section of Biology 2e by Mary Ann Clark and others, whose whole-book authors are Mary Ann Clark, Matthew Douglas and Jung Choi. OpenStax publishes the book; no separate section author is credited. The citation panel gives whole-book publication on 28 March 2018, rather than a section revision date.

Cited passages: §10.1, Genomic DNA; Eukaryotic Chromosomal Structure and Compaction, Figure 10.4 and final paragraph; citation information identifying the authors and publication date.