this breed communicates with a noise that sounds like a little chuckle instead of a cat's normal mewling.

How would the previous sentence be correctly capitalized?
Answer: This breed communicates with a noise that sounds like a little chuckle instead of a cat's normal mewling.
centrifuge at 95,000 x g for 30 min, 4 c.

How would the previous sentence be correctly capitalized?
Answer: Centrifuge at 95,000 x g for 30 min, 4 C.
this conviction of hers had been supported by her results on many-valued and non-classical logics, especially on applications of various generalisations of post algebras to logics of programs and approximation logics.

How would the previous sentence be correctly capitalized?
Answer: This conviction of hers had been supported by her results on many-valued and non-classical logics, especially on applications of various generalisations of Post algebras to logics of programs and approximation logics.
in infants, atopic dermatitis typically begins around 6 to 12 weeks of age.

How would the previous sentence be correctly capitalized?
Answer: In infants, atopic dermatitis typically begins around 6 to 12 weeks of age.