The phrase "a direct addition" is correct and usable in written English.
It can be used when referring to something that is added straightforwardly or without any intermediaries.
Example: "The new feature is a direct addition to the existing software, enhancing its functionality."
Alternatives: "an immediate addition" or "a straightforward addition".
Oxygen also intervenes in a direct addition reaction to one of the intermediate reaction products.
The high redox potentials, acidic pH and elevated sulphate concentrations required for metals dissolution were found to be a consequence of (a) direct addition of ferric sulphate as a lixiviant or (b) in situ generation of acidity and ferric sulphate via microbially-mediated oxidation of accessory pyrite.
However, a direct addition of rosin to the oil modified alkyd or pigment modification can not be excluded.
This will be achieved via an OpenGL intercept (similar to ML2VR), or a direct addition to the Minecraft source code if need be.
A bolus is a direct addition of the drug into the central (blood) compartment.
4 hr after transfection, cells received a direct addition of medium A containing 10% FCS (final concentration).
Path A involves direct addition of O2 to IM5 to generate IM5a.
As a result, the direct addition as a lyophilized culture was considered more efficient as direct addition was easier, quicker, and less vulnerable to contamination.
Moreover, it was found that although ECB modified bitumen is effective to rutting enhancement, there is no improvement as a result of direct addition of it into mixtures.
All assay conditions included a control with direct addition of 1 mM ADP to ensure PK and LDH activities were not rate-limiting.
In non-nitrile solvents, a second pathway involving direct addition of water to give a haloenol intermediate must be operative, however, as the dihalohydration product was still formed in moderate yields (Table 1).
