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  • Author or Editor: Yun-Chen Chang x
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Child obesity is a major global public health issue. This study sought to identify means to improve children’s dietary behaviors through horticultural activities and effectively enhance their health and quality of life. The 129 participants were children in third grade through sixth grade in Hsinchu City, Taiwan. A quasi-experimental design was adopted as an intervention for school horticultural activities. The 68 students in the intervention group engaged in 40-minute horticultural sessions for 6 weeks. The pretest and post-test scores of both groups were measured using the Physical Questionnaire for older Children, the Connection to Nature Index, the Willingness to Taste Fruits and Vegetable Scale, and the Children’s Quality of Life Scale, as well as questionnaire items. The qualitative and quantitative data were analyzed through a parallel mixed-method approach. The findings showed that the intervention group’s physical activity levels, nature connectedness, and overall health were higher than those of the control groups. There were no significant differences in willingness to taste fruits and vegetables. This study demonstrates that engaging in natural school spaces and participating in horticultural activities improved the physical and mental health of children. Natural elements should be incorporated into the campus design, and children should be encouraged to participate in school horticultural activities.

Open Access

Experiments were conducted on 6-month-old chinese ixora (Ixora chinensis Lam.) from February 1999 to April 2000. Floral development was studied with scanning electron microscopy (SEM) to determine the flowering sequences. Morphological characters were used to clarify the stages of flowering processes. The time of organogenesis and flowering arrangement was established through field observations. Floral evocation occurred in early September, floral initiation occurred in the middle of September and floral differentiation began in late September. A distinctly convex apex with bracts around the shoulder indicated the beginning of reproductive development. Subsequently, primary inflorescence axes were observed and differentiated into secondary, tertiary, and quaternary inflorescence axes consecutively in about one and a half months. Once the terminal apex reached the inflorescence bud stage, it would flower without abortion, and this may be assessed as no return. The sepals, petals, stamens, and pistil were well developed thereafter and anthesis was achieved in January through March in the following year. The observation of floral differentiation sequences and investigation of floret arrangement made it certain that chinese ixora had cymose inflorescence (cyme), but not corymb. A quadratic equation was established to predict floret number from the differentiation level (a quantitative description of differentiation stage) of a developed inflorescence.

Free access

Nuclear DNA contents were estimated by flow cytometry in 18 Phalaenopsis Blume species and Doritis pulcherrima Lindl. DNA amounts differed 6.07-fold, from 2.74 pg/diploid nuclear DNA content (2C) in P. sanderiana Rchb.f. to 16.61 pg/2C in P. parishii Rchb.f. Nuclear DNA contents of P. aphrodite Rchb.f. clones, W01-38 (2n = 2x = 38), W01-41 (2n = 3x = 57), and W01-22 (2n = 4x = 76), displayed a linear relationship with their chromosome numbers, indicating the accuracy of flow cytometry. Our results also suggest that the 2C-values of the Phalaenopsis sp. correlate with their chromosome sizes. The comparative analyses of DNA contents may provide information to molecular geneticists and systematists for genome analysis in Phalaenopsis. Endoreduplication was found in various tissues of P. equestris at different levels. The highest degree of endoreduplication in P. equestris was detected in leaves.

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