The phrase "already containing" is correct and usable in written English.
It can be used to describe something that includes or holds certain elements or components that are present at a prior time.
Example: "The document is already containing the necessary information for the project."
Alternatives: "previously including" or "already holding".
In lizards and birds, ovulation does not usually occur into a tract already containing an egg.
That might, it is feared, open a Pandora's box already containing Basques, Corsicans and other awkward peoples.
They show that starting from an initial population already containing a good solution is very effective.
Aliquots of different sample dilutions were added to suitable wells already containing 100 µl medium.
He brings real power to a midfield already containing the considerable presence of Sandro and Mousa Dembele.
After 12 hours, the cells were transferred to the bioreactor already containing the corresponding medium to reach an optical density at 600 nm (OD600) of ∼0.1.
To each 2 ml Eppendorff tube already containing 20 μl sample, 180 μl diluted blood cell suspension was added and mixed.
As long as the equivalence of biological process is accepted, stacking a couple of transgenic inserts into a whole genome, already containing thousands of recombination hotspots, appears innocuous.
The addition of phenolphthalein to solutions already containing the glycol additives results in a kinetically-controlled tin reduction process and a smooth matte tin deposit.
A new method is outlined to simulate the probabilities of inserting/removing a gas molecule in a host matrix already containing n molecules of gas.
ScrollMotion certainly isn't the first to take such an approach – in fact, Apple's got an entire section [iTunes link] dedicated to this type of thing, already containing over 600 books.
