Closure to "Engineering Properties of Biocementation Coarse- and Fine-Grained Sand Catalyzed by Bacterial Cells and Bacterial Enzyme" by Tung Hoang, James Alleman, Bora Cetin, and Sun-Gyu Choi.

Furthermore, the discussers' equation presents a relationship between UCS and the porosity/cement index that are suitable for portland cement stabilized soils via mixing method. Soils and portland cement are mixed uniformly at their dry states during the stabilization process, whereas the biocementation stabilization adopts a percolation circulation technique that solidifies the specimen column from top to bottom. Portland cement stabilization and biocementation stabilization techniques' working mechanisms are different and equations developed for predicting UCS of portland cement stabilized soils may not be directly applicable to soils stabilized using biocementation techniques. [Extracted from the article]