Addition of additives after complete binding of lysozyme to PS particles desorbed the bound lysozyme from the PS particles. This desorption by Arg and NaCl occurred even 14 h after lysozyme binding to the PS particles and the protein concentration was fivefold higher than in the absence of additives. Moreover, the recovery of enzyme activity was sixfold higher than without additives after 14 h of binding. However, the value of the enzyme activity was lower when lysozyme was first bound to the PS particles in the absence of additives than when lysozyme was bound in the presence of additives. These observations indicated that a portion of lysozyme adsorbed on PS particles is deactivated. Moreover, protein concentration and enzyme activity decreased in a similar time-dependent manner when Arg and NaCl were mixed after lysozyme was bound to PS particles. These observations suggest that the amount of reversibly bound inactive proteins increased and further became irreversible. These results may be explained by assuming three populations of bound lysozyme, i.e., irreversibly bound inactive protein, reversibly bound inactive protein, and reversibly bound active protein. The latter can be fully recovered by Arg and NaCl. Arg can also recover some portion of irreversibly bound protein. In summary, we have shown that the addition of Arg markedly suppresses protein adsorption on PS particles, which is a commonly-used material for vessels such as disposable test tubes and microtubes, and moreover can detach adsorbed proteins from PS particles. It has already been shown that Arg is one of the most versatile solution additives for proteins. Arg has a number of advantages in that it is a natural cell metabolite, biodegradable, nontoxic, and inexpensive. Arg has been used to enhance protein refolding, augment acid-induced viral inactivation, suppress protein aggregation during long-term storage, and enhance protein recovery during column chromatography. These effects of Arg may be at least in part due to its ability to suppress multiple interactions between proteins and chemical structures of solid surfaces as observed with the model PS particles. Prostatitis is a common yet 
uncertain condition without clear diagnostic criteria and treatment strategies. In 1995, The National Institutes of Health organized the International Prostatitis Collaborative Network workshop and proposed a new classification of prostatitis, and since then asymptomatic inammatory prostatitis has been regarded as a separate clinical entity among other prostatitis syndromes. This condition is characterized by the presence of inammatory cells in expressed prostatic secretion or in histologically prostate biopsy specimens in an otherwise asymptomatic patient and is therefore diagnosed solely in the laboratory. Unfortunately, while many investigators have studied symptomatic prostatitis, little research has been done with regard to asymptomatic prostatitis.