The phrase "grain of evidence" is correct and is often used in written English
It is used to refer to a small piece of evidence or facts, which may not be enough to prove something, but is enough to suggest something is true. For example: "There was a grain of evidence that suggested the suspect was involved in the crime."
The notion stems from grains of evidence, such as studies that have shown an increase in inflammation with age.
On the one hand, this went against the grain of a truly evidence-based plan; on the other, innovation in tobacco control is crucial to counter the continually-changing tactics of the tobacco industry.
The existence of four-grain junctions is evidence of grain-boundary sliding (Ashby and Verral 1973; Karato et al. 1998; Goldsby and Kohlstedt 2001).
The petrographic analysis also revealed that there is dominance of monocrystalline quartz grains and evidence of cratonic setting derivation.
Our data from experiments in brewing maize meal into chicha demonstrate that the damaged grains are evidence of the consumption of this fermented beverage.
Leytem et al. [73] found that pigs that were fed these grains showed evidence of hind-gut hydrolysis of phytic acid, possibly by intestinal microflora.
The microboudinage structure of columnar grains is one of the forms of evidence commonly used to estimate the palaeostress state imposed on metamorphic tectonites.
This example suggests caution in accepting apparent homology of the pale-seeded mutation in the different species of grain amaranth as evidence for a single domestication.
Studies of the frequency of rock deposited on the seafloor by icebergs have recorded variations in the size of sediment grains that provide evidence of changes in seafloor currents, and observed levels of the carbonate content of subtropical sediments have pointed to cycles of little ice ages occurring roughly every 1,000 to 2,000 years.
While several Hayabusa grains have evidence of space weathering effects on their surfaces, they also have some unexpected properties (Noguchi et al. 2011, 2013).
