Introduction: Almost half of the world’s population is concentrated under the age of less than 25 years. The highest number of this population is living in developing countries. Sub-Saharan Africa youths constitute 2...Introduction: Almost half of the world’s population is concentrated under the age of less than 25 years. The highest number of this population is living in developing countries. Sub-Saharan Africa youths constitute 20% - 30% of this population. Early sexual initiation is common among young people, and it has several sexual and reproductive health consequences. So, the objective of this research was to assess the prevalence of early sexual initiation and associated factors among preparatory school students of FaggetaLekoma district, Awi zone, Northwest Ethiopia, 2015. Methods and Materials: Institutional based cross-sectional study design with stratified sampling technique was used. Completeness of questionnaires was checked visually and data were coded and entered into Epi-Info version 3.5.4. and transported to SPSS version 16 software package for analysis. Bivariate and multivariate logistic regression was used to determine factors associated with early sexual initiation at 95% confidence interval. Result: A total of 270 students were included in the study. The mean age of the respondents was 18.82 ± 1.91 years, of which 117 (43.3%) were females, and 156 (57.8%) were rural residents. Among the total students who attended their class within the study period, 55 (20.4%) students had early sexual initiation. The results of multivariable model revealed that age AOR = 4.38, 95% CI (1.75 - 10.94), grade AOR = 4.18, 95% CI (1.58 - 11.04), existence of a boy/girl friend OR = 8.56, 95% CI (3.16 - 23.14), parental supervision AOR = 0.20, 95% CI (0.04 - 0.94) and peer pressure AOR = 3.56, 95% CI (1.31 - 9.66) were found to be significantly associated with early sexual initiation in multivariable analysis with P-value < 0.05. Conclusion and Recommendation: The current study found that early sexual initiation is still the problem. Among those who had initiated sex early, most of them had sex within the past 12 months, most of them had sex with their boy/girl friends and majority of them did not use condom. Age, grade, exi展开更多
Crude extracts of Alpinia conchigera a species from the Malaysian Ginger (Zingiberaceae) family and its fractions obtained from various extraction methods were assayed for melanogenesis inhibition activity and cell vi...Crude extracts of Alpinia conchigera a species from the Malaysian Ginger (Zingiberaceae) family and its fractions obtained from various extraction methods were assayed for melanogenesis inhibition activity and cell viability. The crude extract obtained from the ethanolic extraction and the super critical fluid extraction did not exhibit significant melanin inhibition activity and was shown to be toxic to the melanocyte cells in comparison to the water extract. The crude aqueous extracts displayed melanin inhibition of 96.38 ± 1.60% and cell viability 109.90 ± 8.32% at a concentration of 500 μg/mL. Bioassay guided fractionation was performed on the water extracts to isolate the active compounds. The actives were identified as trans-cinnamaldehyde and chavicol glucopyranoside with both compound showing potent anti-melanogenesis activity. At 4.9 μg/ml, both trans-cinnamaldehyde and chavicol glucopyranoside gave 85% inhibition of melanin formation in vitro with 77% and 97% cell viability respectively. In comparison, kojic acid, a known skin lightening agent showed 90.0% inhibition at 100 μg/mL. The bioactive composition comprising the extract, active fraction, purified compounds or mixture thereof of Alpinia conchigera may be used for cosmetic and pharmaceutical applications, particularly for the purposes of reducing skin pigmentation.展开更多
On the basis of survey, students of Preparatory Ethnic Minority are not interested in English learning, and they lack language learning strategies, listening and oral abilities when they are studying English. Accordin...On the basis of survey, students of Preparatory Ethnic Minority are not interested in English learning, and they lack language learning strategies, listening and oral abilities when they are studying English. According to theories of Second Language Acquisition, connected with teaching practice, new English Learning Model is discussed and constructed. It includes"1+2+3" curriculum model, which advocates"Student centered"teaching method and setting up optional courses so that students will at tain the set goal smoothly.展开更多
Taking Shawen Ecological Tech-Industrial Park in Guiyang City for example,the ecological planning methods and procedures of urban preparatory construction land were studied.It was found that the urban preparatory cons...Taking Shawen Ecological Tech-Industrial Park in Guiyang City for example,the ecological planning methods and procedures of urban preparatory construction land were studied.It was found that the urban preparatory construction land could be classified into four categories through analyzing its ecological sensitivity,i.e.the most sensitive area,secondarily sensitive area,less sensitive area and non-sensitive area.All types of construction were prohibited in the most sensitive area which provided 'negative' results for the future development of preparatory construction land.On this basis,certain land use types were selected to carry out suitability analysis of land use which could provide 'positive' results for the future development of preparatory construction land,i.e.guide the direction and layout of land use development.To improve the studies on ecological planning,the above-mentioned analysis results were combined to construct the ecological network,so as to form an ecological planning method combining both horizontal and vertical ecological analysis.展开更多
In this paper, many factors restricting and affecting the actual effectiveness of course ethnic theory and policy are summarized, among which student factors mainly include unavailable major foundation, new strange co...In this paper, many factors restricting and affecting the actual effectiveness of course ethnic theory and policy are summarized, among which student factors mainly include unavailable major foundation, new strange course, and having no idea about how to learn in the short term, narrow knowledge scope because of the examination-oriented education, poor self-control ability and attitude toward learning, and difference among the students of different minorities in the preparatory education, so that the actual teaching effectiveness is different. The teaching contents provided by teachers are not enough scientific, and the teaching pertinence is not strong; all parts of teaching and especially the effectiveness of processing the key and difficult points are not good enough, so that students are guided not very well to actively participate in classroom teaching activities, etc. Subsequently, an analysis is made around integrating and excavating teaching materials, understanding teaching contents, valuing the teaching process, and helping the students of preparatory education change from passively learning knowledge to initiatively accepting knowledge in a targeted way, and then some approaches, methods, and strategies of improving the actual teaching effectiveness of the course are explored.展开更多
文摘Introduction: Almost half of the world’s population is concentrated under the age of less than 25 years. The highest number of this population is living in developing countries. Sub-Saharan Africa youths constitute 20% - 30% of this population. Early sexual initiation is common among young people, and it has several sexual and reproductive health consequences. So, the objective of this research was to assess the prevalence of early sexual initiation and associated factors among preparatory school students of FaggetaLekoma district, Awi zone, Northwest Ethiopia, 2015. Methods and Materials: Institutional based cross-sectional study design with stratified sampling technique was used. Completeness of questionnaires was checked visually and data were coded and entered into Epi-Info version 3.5.4. and transported to SPSS version 16 software package for analysis. Bivariate and multivariate logistic regression was used to determine factors associated with early sexual initiation at 95% confidence interval. Result: A total of 270 students were included in the study. The mean age of the respondents was 18.82 ± 1.91 years, of which 117 (43.3%) were females, and 156 (57.8%) were rural residents. Among the total students who attended their class within the study period, 55 (20.4%) students had early sexual initiation. The results of multivariable model revealed that age AOR = 4.38, 95% CI (1.75 - 10.94), grade AOR = 4.18, 95% CI (1.58 - 11.04), existence of a boy/girl friend OR = 8.56, 95% CI (3.16 - 23.14), parental supervision AOR = 0.20, 95% CI (0.04 - 0.94) and peer pressure AOR = 3.56, 95% CI (1.31 - 9.66) were found to be significantly associated with early sexual initiation in multivariable analysis with P-value < 0.05. Conclusion and Recommendation: The current study found that early sexual initiation is still the problem. Among those who had initiated sex early, most of them had sex within the past 12 months, most of them had sex with their boy/girl friends and majority of them did not use condom. Age, grade, exi
文摘Crude extracts of Alpinia conchigera a species from the Malaysian Ginger (Zingiberaceae) family and its fractions obtained from various extraction methods were assayed for melanogenesis inhibition activity and cell viability. The crude extract obtained from the ethanolic extraction and the super critical fluid extraction did not exhibit significant melanin inhibition activity and was shown to be toxic to the melanocyte cells in comparison to the water extract. The crude aqueous extracts displayed melanin inhibition of 96.38 ± 1.60% and cell viability 109.90 ± 8.32% at a concentration of 500 μg/mL. Bioassay guided fractionation was performed on the water extracts to isolate the active compounds. The actives were identified as trans-cinnamaldehyde and chavicol glucopyranoside with both compound showing potent anti-melanogenesis activity. At 4.9 μg/ml, both trans-cinnamaldehyde and chavicol glucopyranoside gave 85% inhibition of melanin formation in vitro with 77% and 97% cell viability respectively. In comparison, kojic acid, a known skin lightening agent showed 90.0% inhibition at 100 μg/mL. The bioactive composition comprising the extract, active fraction, purified compounds or mixture thereof of Alpinia conchigera may be used for cosmetic and pharmaceutical applications, particularly for the purposes of reducing skin pigmentation.
文摘On the basis of survey, students of Preparatory Ethnic Minority are not interested in English learning, and they lack language learning strategies, listening and oral abilities when they are studying English. According to theories of Second Language Acquisition, connected with teaching practice, new English Learning Model is discussed and constructed. It includes"1+2+3" curriculum model, which advocates"Student centered"teaching method and setting up optional courses so that students will at tain the set goal smoothly.
文摘Taking Shawen Ecological Tech-Industrial Park in Guiyang City for example,the ecological planning methods and procedures of urban preparatory construction land were studied.It was found that the urban preparatory construction land could be classified into four categories through analyzing its ecological sensitivity,i.e.the most sensitive area,secondarily sensitive area,less sensitive area and non-sensitive area.All types of construction were prohibited in the most sensitive area which provided 'negative' results for the future development of preparatory construction land.On this basis,certain land use types were selected to carry out suitability analysis of land use which could provide 'positive' results for the future development of preparatory construction land,i.e.guide the direction and layout of land use development.To improve the studies on ecological planning,the above-mentioned analysis results were combined to construct the ecological network,so as to form an ecological planning method combining both horizontal and vertical ecological analysis.
文摘In this paper, many factors restricting and affecting the actual effectiveness of course ethnic theory and policy are summarized, among which student factors mainly include unavailable major foundation, new strange course, and having no idea about how to learn in the short term, narrow knowledge scope because of the examination-oriented education, poor self-control ability and attitude toward learning, and difference among the students of different minorities in the preparatory education, so that the actual teaching effectiveness is different. The teaching contents provided by teachers are not enough scientific, and the teaching pertinence is not strong; all parts of teaching and especially the effectiveness of processing the key and difficult points are not good enough, so that students are guided not very well to actively participate in classroom teaching activities, etc. Subsequently, an analysis is made around integrating and excavating teaching materials, understanding teaching contents, valuing the teaching process, and helping the students of preparatory education change from passively learning knowledge to initiatively accepting knowledge in a targeted way, and then some approaches, methods, and strategies of improving the actual teaching effectiveness of the course are explored.
