戒毒所和妇教所收容人员对艾滋病检测咨询的态度及其影响因素

目的了解戒毒所和妇教所收容人员艾滋病检测咨询经历、态度及影响因素。方法在戒毒所和妇教所分别调查了185名吸毒者和159名暗娼,内容包括人口学信息、性行为、吸毒史、艾滋病检测相关知识及态度等,分析两组人群对所内进行艾滋病检测咨询态度的影响因素。结果所有收容人员在入所时都做过HIV检测,但只有26.2%的人表示自己做过检测,其中81.1%知道检测结果。分别有83.1%的吸毒者和84.6%的暗娼愿意在戒毒所和妇教所咨询艾滋病知识;有80.9%的吸毒者和78.9%的暗娼愿意在戒毒所和妇教所做艾滋病检测。结论戒毒所和妇教所收容人员在入所时已做HIV检测,但多数没有被告知。收容人员对所内开展艾滋病检测咨询表示接受。戒毒所和妇教所应注意改善检测服务,加强检测结果告知。     

Rare case of bizarre parosteal osteochondromatous proliferation presenting in the zygoma

Bizarre parosteal osteochondromatous proliferation is a rare benign lesion that tends to occur within the bones of the hands and feet. To our knowledge this is the third published case of its occurrence in the head region. We report the case of a 31-year-old man with an eight-month history of an asymptomatic, slowly enlarging lump on the right zygomatic area diagnosed as bizarre parosteal osteochondromatous proliferation. Diagnosis depends on specific radiological and histopathological features. Treatment is by complete excision, and recurrence has been reported in up to 50% of cases. Awareness of the condition will expedite its correct diagnosis and management.     

HIV prevalence, sociodemographic, and behavioral correlates and recruitment methods among injection drug users in St. Petersburg, Russia

OBJECTIVE: In St. Petersburg, Russia, we sought to describe the characteristics of active high-risk injection drug users (IDUs) to evaluate the associations between behavioral and demographic characteristics and HIV-1 infection and to describe 3 discrete recruitment methods. METHODS: Active high-risk IDUs were recruited in 3 ways: through street outreach, at facilities serving IDUs, and by network-based chain referral. Recruits were screened, counseled, and tested for HIV-1. Sociodemographic and behavioral data were collected. HIV-1 prevalence was analyzed as a function of sociodemographic and behavioral variables. RESULTS: During the 10-month recruitment period, data from 900 participants were collected: median age was 24 years, and in the previous month, 96% used heroin and 75% shared needles with others. The baseline HIV prevalence was 30% (95% confidence interval [CI]: 27 to 33). Recruitment through social networks was the most productive strategy. HIV-positive individuals were younger, but none of the other sociodemographic or behavioral characteristics differed significantly by HIV status. CONCLUSIONS: The estimated HIV prevalence of 30% places St. Petersburg among the worst IDU-concentrated epidemics in Europe. Recruitment through network-based chain referral is a useful method for recruiting active IDUs. Sociodemographic and behavioral links to prevalent HIV infection remain to be elucidated.     

Incidence, risk factors and management of delayed wound dehiscence after craniotomy for tumor resection

Dehiscence after a wound has healed is a known complication of craniotomy for tumor resection. We conducted a retrospective analysis of 64 patients who underwent craniotomy for tumor resection followed by radiation or radiosurgery between 2006 and 2010. Five patients (7.8%) were identified who showed wound dehiscence from two to eight months after the craniotomy wound had healed. Four patients had previously undergone additional craniotomies, additional radiosurgery or had been treated with the anti-angiogenic factor, bevacizumab. These treatments may be risk factors for developing delayed dehiscence and, in combination, may potentiate local wound healing problems. Potential mechanisms and management strategies are discussed.     

Millimeter-Wave-to-Terahertz Superconducting Plasmonic Waveguides for Integrated Nanophotonics at Cryogenic Temperatures

Plasmonics, as a rapidly growing research field, provides new pathways to guide and modulate highly confined light in the microwave-to-optical range of frequencies. We demonstrated a plasmonic slot waveguide, at the nanometer scale, based on the high-transition-temperature (T_c) superconductor Bi₂Sr₂CaCu₂O_8+δ (BSCCO), to facilitate the manifestation of chip-scale millimeter wave (mm-wave)-to-terahertz (THz) integrated circuitry operating at cryogenic temperatures. We investigated the effect of geometrical parameters on the modal characteristics of the BSCCO plasmonic slot waveguide between 100 and 800 GHz. In addition, we investigated the thermal sensing of the modal characteristics of the nanoscale superconducting slot waveguide and showed that, at a lower frequency, the fundamental mode of the waveguide had a larger propagation length, a lower effective refractive index, and a strongly localized modal energy. Moreover, we found that our device offered a larger SPP propagation length and higher field confinement than the gold plasmonic waveguides at broad temperature ranges below BSCCO’s T_c. The proposed device can provide a new route toward realizing cryogenic low-loss photonic integrated circuitry at the nanoscale.