Although common peptidases are associated with peptide bond hydrolysis, examples of enzymes are described that can, under certain conditions, catalyze peptide bond formation between polypeptide fragments (Bordusa 2002).
In Mexico, the first probable outbreak of histoplasmosis was described and recorded in a Public Health Acts ledger from the state of Nuevo León at the end of the 19th century (ca. 1885) when certain clinical scenarios were described that led to the suspicion that there was an epidemic of this mycosis in mine workers from areas containing a large amount of bat guano.
It has been described that the activation of certain Toll-like receptors can polarize MSCs to switch from a predominantly immune-suppressive MSC2 (Toll-like receptor3-primed) to a proinflammatory MSC1 (TRL4-primed) phenotype (40, 41).
Accounting for ninety percent of systemic infection, it has been described that the human milieu in certain circumstances permits invasion by A. fumigatus but restricts it in cases of A. flavus and niger [ 6, 7]. A. flavus possesses a survival ability in higher temperatures hence its predominance in the Middle East, Africa, and parts of Southeast Asia [ 8].
Major causes that have been described are certain human errors like forgetting to add a reactant, inadequate tests, a heating medium not controlled, unstable substances neglected, and lower temperatures not thought to be a risk.
The only strain-specific factor that may limit the application of the technique is if the strain carries a sucrose utilisation system that has been described in certain isolates of E. coli (18).
The sequestration and accumulation of sunitinib in the lysosomes is similar to a phenomenon that has been described for certain other chemotherapeutics or photosensitizing compounds, and depends, at least to some extent, on the hydrophobic and weak basic features of the molecule.
Apart from its in vivo role as osmolyte, floridoside has been described to have certain properties that have raised the interest in this molecule.
It is well described that certain malignancies, including ovarian, myeloma and renal cell carcinoma, elicit a more pronounced inflammatory response than other tumours and this may account for the differences in the cytokine profiles observed (Nash et al, 1999).
Many different models to analyze drug-release have been described, all optimized for certain factors that influence release including: release medium, fluid exchange volume, flow rate, and interfacial gap [ 22- 24].
