The phrase "a modified procedure of" is correct and usable in written English.
It can be used when describing a procedure that has been altered or adjusted in some way.
Example: "The researchers implemented a modified procedure of data collection to improve accuracy."
Alternatives: "an adjusted method of" or "a revised process of".
In this work, sediment samples collected from several Spanish harbours were tested with two toxicity procedures, designed for solid samples: the Microtox® Basic Solid-Phase Test (BSPT) and a modified procedure of the previous test protocol (mBSPT).
This was done using a modified procedure of the method described by Longin [20].
The synthesis of CdSe and CdSe/ZnS NPs was undertaken following a modified procedure of Peng et al. [25].
Extracellular protease activity was determined using a modified procedure of Fujiwara et al. [13] with 1.0% casein in 50 mM Tris-HCl buffer pH 8.0 as substrate.
We followed a modified procedure of the AFLP technique [48].
The dipeptide L-Ala-D-Glu was synthesized chemically according to Sachs and Brand [46] and the tripeptide L-Ala-γ-D-Glu-L-Lys was synthesized by a modified procedure of Schmidt et al. [47].
Background/Purpose: To evaluate the safety and efficiency of triangular tapered duodenoplasty, a modified procedure for the treatment of congenital duodenal obstruction was designed.
We present a modified procedure for the integration of complex genetic circuits into the Escherichia coli genome, to provide an efficient synthetic approach for stochastic study and the artificial engineering of genetic networks.
A quick solution to this problem is to use a modified procedure for parallel analysis of ranked data.
We describe a modified procedure for the translocation of the left coronary artery (LCA) combined with mitral annuloplasty in an adult with ALCAPA and concomitant mitral regurgitation (MR) and the associated midterm results.
However, we propose a modified procedure to not only avoid the occurrences of interruptions the most, but also to reduce the number of edges in the path substantially.
