Col1a1-GFP Transgene Expression in Developing Incisors

Previous studies have shown that terminal differentiation of odontoblasts is accompanied by dramatic increases in type I collagen synthesis. Recently transgenic mice in which green fluorescent protein (GFP) expression is under the control of the rat 3.6 (pOBCol3.6GFPtpz) and 2.3 (pOBCol2.3GFPemd) Col1a1 promoter fragments were generated. Our analysis of these GFP-expressing transgenic mice shows that the 2.3-kb promoter fragment directs strong expression of GFP only to bones and teeth, whereas the 3.6-kb fragment of promoter directs strong expression of GFP in bone and tooth, as well as in other type I collagen producing tissues. Our observations of incisors in these transgenic mice show high levels of GFP expression in functional odontoblasts and in differentiated osteoblasts. These observations show that expression of GFP reporter genes closely follow the patterns of expression of &#102 1(I) collagen in various tissues including odontoblasts.     

Boat pressure washing wastewater treatment with calcium oxide and/or ferric chloride

The aim of this study was to investigate the efficiency of (1) chemical precipitation by calcium oxide, (2) coagulation/flocculation by ferric chloride (FC), and (3) the combination these two methods in reducing the toxicity of wastewater generated by boat pressure washing. All three methods gave satisfactory results in the removal of colour, turbidity, Cr, Fe, Cu, Zn, and Pb. The concentrations of heavy metals were lowered below national limits with 1 g of CaO, 2.54 mg of Fe3+ in the form of FeCl3x6H2O, and the combination of 0.25 g of CaO and 5.08 mg of Fe3+ per 50 mL of wastewater. Both CaO (1.50 g per 50 mL of wastewater) and FC proved efficient, but their combination yielded a significantly better performance: 99.41 %, 100.00 %, 97.87 %, 99.09 %, 99.90 %, 99.46 % and 98.33 % for colour, turbidity, Cr, Fe, Cu, Zn, and Pb respectively. For colour, Cr, Cu, Zn, and Pb removal efficiencies increased in the following order: FC相似文献   

Adolescents' agreement to test for HIV when different testing methods are offered

Offering rapid HIV testing improves rates of testing in adults, but little is known about whether offering adolescents a choice of testing methods increases rates of testing. The aims of the study were to determine rates of HIV testing in adolescents when different testing methods were offered and explore factors associated with agreement to be tested for HIV. Participants (n= 200, sexually experienced 13-22 year olds) were recruited from an urban adolescent clinic, completed a 99-item theory-based survey and were offered their choice of venipuncture, rapid fingerstick or rapid oral fluid HIV testing. Approximately half (49.5%) agreed to HIV testing. Male gender, parental completion of high school, intention to test for HIV if offered by clinician and higher perceived likelihood of current HIV infection were independently associated with agreement to test. Combining new strategies, such as opt-out testing, with routine testing may be needed to improve rates of adolescent HIV testing.     

Adolescent Preferences for Human Immunodeficiency Virus Testing Methods and Impact of Rapid Tests on Receipt of Results

PurposeRapid human immunodeficiency virus (HIV) tests may be more acceptable to adolescents and may improve receipt of test results. We conducted a study to determine (a) adolescent preferences for different HIV testing methods (rapid oral fluid vs. rapid fingerstick vs. traditional venipuncture), (b) factors associated with choice of a rapid vs. traditional test, and (c) whether those who chose a rapid method were more likely to receive test results.MethodsParticipants (N = 99, 13–22 years old, both genders) were recruited from an urban hospital-based adolescent primary care clinic, agreed to HIV testing with their choice of method, and completed a questionnaire assessing demographic characteristics and attitudes about HIV testing. Logistic regression modeling was used to determine factors associated with choice of a rapid versus traditional test.ResultsHalf (50.5%) of participants chose rapid oral fluid testing, 30.3% traditional venipuncture testing, and 19.2% rapid fingerstick testing (p < .01). Factors independently associated with choice of a rapid versus traditional method included preference for an oral fluid versus blood test and perceived approval of HIV testing by one's healthcare provider. Participants who chose a rapid test were more likely to receive their test results within the follow-up period than participants who chose a traditional test (91.3% vs. 46.7%, p < .001).ConclusionsIn this study, 70% of adolescents preferred rapid to traditional HIV testing, and rapid testers were more likely to receive their results within the follow-up period. Offering rapid testing may lead to improved receipt of results among adolescents in urban primary care settings.     

Ross procedure using pulmonary autograft with a previous prosthetic patch

The case described is of a 7-year-old boy with recurrent long-segment left ventricular outflow tract obstruction. Due to previous pulmonary artery band stenosis and subsequent repair with a prosthetic patch, the pulmonary root was not intact. In this complicated Ross-Konno operation, the prosthetic patch was replaced with autologous tissue and the repaired pulmonary root was used successfully as an autograft.