RESUMO
The penis is one of the end-artery organs in the human body. The blood supply of the penis depends on the internal pudendal artery, which arises from the anterior division of the internal iliac artery. Subsequently, the penis is one of the organs that are highly affected by peripheral vascular disease. Furthermore, erectile dysfunction is a clinical sign that might precede coronary heart disease. Artificial entrapment of the blood into the cavernous bodies is one of the treatment options for erectile dysfunction. In addition, the same concept might be utilized in some sex aids to increase self-pleasure; hence, penile rings are widely used in some cultures. We present here a case of metal penile ring entrapment, which was managed successfully with the help of the hospital maintenance team. Therefore, it is of tremendous importance in unusual cases to seek advice from all possible resources. Such complications should be highlighted to increase the awareness of the users and the medical professionals as well.
RESUMO
Low-temperature (1.4 K), single-molecule fluorescence-excitation spectra have been recorded for individual reaction center-light-harvesting 1 complexes from Rhodopseudomonas palustris and the PufX(-) strain of Rhodobacter sphaeroides. More than 80% of the complexes from Rb. sphaeroides show only broad absorption bands, whereas nearly all of the complexes from Rps. palustris also have a narrow line at the low-energy end of their spectrum. We describe how the presence of this narrow feature indicates the presence of a gap in the electronic structure of the light-harvesting 1 complex from Rps. palustris, which provides strong support for the physical gap that was previously modeled in its x-ray crystal structure.
