The phrase "are directly associated" is correct and usable in written English.
It can be used to indicate a clear and immediate relationship between two or more entities or concepts.
Example: "The symptoms of the disease are directly associated with the lack of vitamin D in the diet."
Alternatives: "are closely linked" or "are strongly connected."
The masks, like the narrative carvings, are directly associated with the rituals for departed souls.
The Covered Activities do not include activities that are directly associated with Searsville Dam and Reservoir.
But few of the defendants are directly associated with the president's reform movement.
The expressed colors of the aragonite flakes are directly associated with its structural architecture.
It is observed that the modeling efficiency and accuracy are directly associated with the design space.
Articular cartilage is a highly organized tissue, its zonal differences in biochemical content and bioelectrical properties are directly associated with depth-dependent changes in mechanical properties13,14.
In this study, we focused on layer 2/3 pyramidal neurons, which are directly associated with pain sensation and pain-related behaviours32,33,34.
Neuronal networks that are directly associated with glomeruli in the olfactory bulb are thought to comprise functional modules.
In her recent book, Wolf has revealed that, in women, the brain and the vagina are directly associated via a number of pathways, and a woman's consciousness and mental ability are dependent on the functioning of her vagina.
And while some of its qualities are directly associated with winning and losing – the drama, jubilation, agony, excitement and anxiety – for some the aesthetic, intellectual and innovational aspects of the game are where it's at.
The Alphaproteobacteria are directly associated with the protists.[52].[52]
