We observed that the distribution of the abundance of OTUs or taxonomies departed significantly from a normal distribution because of the fact that bacteria were not presented in many samples.
As these bacteria are not present in in vitro experiments, sulindac cannot be converted into its active metabolite.
Culturable bacteria are not present, and nucleic acids from triggering bacteria have been detected only occasionally, in synovial samples from patients with enterobacteria-triggered ReA [ 37, 42].
A cell wall, such as is characteristic of gram positive or gram negative bacteria is not present in these archaeal organisms.
From an immunologic perspective, eosinophils, more prevalent during an AR flare, can cause chronic inflammation in the mucosa, even when bacteria are not present.
This poor biological degradation of diclofenac in the MBR can be due to various factors; for example, the degrading bacteria are not present, the degradation rate is too low (e.g., a higher hydraulic retention time is needed), environmental conditions are not suitable for degradation (nutrients, pH, temperature), and so forth.
However, if the methane bacteria are not present in suitable numbers or are being slowed down by unfavorable environmental conditions, they will not use the acids as rapidly as they are produced by the acid formers, and the volatile acids will increase in concentration.
It has been shown that nanoleakage can occur in the absence of marginal gaps in biomaterial dentin interfaces [100], which led to the conclusion that host-derived proteinases make an important contribution to the degradation of incompletely infiltrated collagen in bonded dentin [101], even when bacteria are not present [102,103].
