"declined to half" is a correct and usable phrase in written English.
You can use it to describe a decrease in a quantity or rate. For example, "The unemployment rate has declined to half of what it was last year."
By contrast, "1973" declined to half its peak by 1983, only 10 years later.
In the euchromatic regions, the LD declined to half of its maximum value within approximately 20 kb, 75 kb, and 160kb in the wild, landrace, and N. Am. cultivar populations, respectively, whereas in the heterochromatic regions, the LD declined to half of its maximum value within 350 kb, 900 kb, and 970 kb in the wild, landrace, and N. Am. cultivar populations, respectively.
In an F-PET study of 10 resurfacing THAs that were analyzed 10 33 months after surgery (Forrest et al. 2006), the metabolism in part of the head in 1 case had declined to half of the normal level.
Serum PCT increased immediately after surgical injury, peaked on POD1, and declined to half its peak level from POD2 to POD3 after uncomplicated major abdominal surgery [ 57, 66, 77, 100].
In a PET study of 10 resurfacing cases, analyzed 10 33 months after surgery (Forrest et al. 2006), the viability of the bone under the femoral components was assessed as good (although the metabolism in one case had declined to half of the normal in part of the head).
However, if the market declined to half the value, he would need to sell more to reach that $50,000.
This gave a resolution interval (R i; the time taken for neutrophil numbers at the site of inflammation to decline to half maximal (38, 39) for wogonin of ∼23 h, whereas the R i for control zebrafish was >48 h (data not shown).
Over the last 40 years, the grazing land declined to a half by the post-2009 drought period in the sedentary land use site.
Catches declined to about half of that level by 1700, and only increased to about 200,000 tonnes in the late eighteenth century when the Swedish and Scottish fisheries developed apace.
The endogenous levels of IAA declined to a half within 6 h and dropped to a quarter of the original values within 24 48 h following excision from seedlings.
