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We need to translate Russian news post into natural English, format per rules.
First line: short headline under 90 chars, no markdown, no '#'.
Then blank line, then body split into short paragraphs (2-3 sentences each), separated by blank lines.
Wrap few genuinely important facts — key numbers, percentages, drug/company/gene names, dates — in double asterisks . At most 4-5 per post, never a whole sentence.
Wrap study/journal citations and publication references in single underscores (e.g. Nature Aging, July 2026).
We need to preserve all facts, numbers, names, citations exactly.
Let's identify facts:
- Review introduced "arrhythmic zone" – temperature interval where internal clocks lose autonomous rhythm, but cell/organism still viable.
- Review published August 24 in The FEBS Journal.
- Authors compiled data from bacteria to mammals, propose separating temperature at which clocks lose autonomous rhythm from lower temperature limit of viability.
- Circadian clocks – intracellular mechanisms setting ~daily rhythm.
- In some temperature range, rhythm remains close to daily, though individual biochemical reactions go faster or slower. This property is temperature compensation.
- Review asks what happens below this boundary when rhythm no longer sustains itself, but cell/organism still viable.
- "We call 'arrhythmic zone' the interval in which viability is preserved while autonomous rhythm weakens or disappears."
- This is well seen in experiment with cyanobacterial proteins.
- In 2017 experiment, three purified proteins KaiA, KaiB, KaiC mixed in test tube: mechanism that creates daily oscillations.
- Upon cooling to 19°C, rhythmic changes in KaiC became weaker and smoothly went to zero, while cycle length almost unchanged.
- This transition is called Hopf bifurcation: amplitude of autonomous oscillations decays, period almost preserved.
- Protein system still responded to environmental temperature cycles; strongest entrainment by cycle close to its ow
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