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Now showing items 1 - 9 of 9

  • Measurement and Investigation into Air Source Heat Pump Exergy

    Cho, Hung-Pin   Hsu, Ching-Wei   Jwo, Ching-Song   Tsai, Meng-Ying   Chen, Sih-Li  

    This study applies the second law of thermodynamics to analyze the irreversibility of air source heat pump systems. By using both T type thermocouple wires to measure the inlet and outlet temperatures of key components in the system and using pressure transmitters to measure the high and low pressure of the experiment systems, we collect data and use two control volume(CV) models to calculate the generative volume and irreversibility of entropy for each system component. According to the experiment results for both CV models (the CV of the refrigerant section and the CV of the whole control), the heat exchanger is found to have the largest irreversibility. The irreversibility error of the condenser is 4.6% and the irreversibility error of the evaporator is up to 21%. By applying the results of this study it is possible to improve the function of air source heat pump systems through improving the heat exchanger, achieving both cost and energy savings.
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  • Microsporangium development in two species of Oxalis (Oxalidaceae) with different male fertility

    Tsai, Meng-Ying   Chen, Su-Hwa   Kao, Wen-Yuan  

    Highlights • We provided comparison of microspore/pollen development between two Oxalis species. • Different male-fertile floral morphs (M&SH) in Oxalis corymbosa were compared. • M morph (partial male-fertile) shows obvious defect during free microspore forming. • SH morph (fully male-sterile) has several deviations from the sporogenous stage. • Persistent middle layer might result in pollen producing failure of O. corymbosa. Abstract Mid-styled (M, with stigma between two height-levels of stamens), short-styled (S, with stigma placing lower than the two height-levels of stamens) and semi-homostyled morph (SH, with stigma and low-height level stamens at the same position) of Oxalis corymbosa populations were previously found in Taiwan. Low pollen viability (0–4%) was found in flowers bearing the anthers of the S and M morph, while there was no pollen in those of the SH morph. In contrast, 50% pollen viability was found in O. corniculata, which is sympatric with O. corymbosa in Taiwan. We made histological sections and compared the process of microsporogenesis and pollen development of the two species, aiming to find out what possible defects are causing the low pollen viability in O. corymbosa. The process of microsporogenesis and pollen development in the two species of Oxalis was divided into six stages: sporogenous tissue, microspore mother cell, tetrad, free microspore, young and mature pollen grain stage. The results revealed that microsporangium abnormalities of O. corymbosa, including incomplete callose deposition or cytokinesis failure at tetrad stage (M and SH morphs) and persistent/highly vacuolated middle layer cells during free microspore stage (SH morph), might be associated with male-sterility of the species in Taiwan. Besides, more deviations during microsporogenesis and pollen development were observed in the SH morph than in M morphs, which might result in different male fertility within the two floral morphs of O. corymbosa.
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  • Microsporangium development in two species of Oxalis (Oxalidaceae) with different male fertility

    Tsai, Meng-Ying   Chen, Su-Hwa   Kao, Wen-Yuan  

    Mid-styled (M, with stigma between two height-levels of stamens), short-styled (S, with stigma placing lower than the two height-levels of stamens) and semi-homostyled morph (SH, with stigma and low-height level stamens at the same position) of Oxalis corymbosa populations were previously found in Taiwan. Low pollen viability (0-4%) was found in flowers bearing the anthers of the S and M morph, while there was no pollen in those of the SH morph. In contrast, 50% pollen viability was found in O. corniculata, which is sympatric with O. colymbosa in Taiwan. We made histological sections and compared the process of microsporogenesis and pollen development of the two species, aiming to find out what possible defects are causing the low pollen viability in O. corymbosa. The process of microsporogenesis and pollen development in the two species of Oxalis was divided into six stages: sporogenous tissue, microspore mother cell, tetrad, free microspore, young and mature pollen grain stage. The results revealed that microsporangium abnormalities of O. corymbosa, including incomplete callose deposition or cytokinesis failure at tetrad stage (M and SH morphs) and persistent/highly vacuolated middle layer cells during free microspore stage (SH morph), might be associated with male-sterility of the species in Taiwan. Besides, more deviations during microsporogenesis and pollen development were observed in the SH morph than in M morphs, which might result in different male fertility within the two floral morphs of O. cotymbosa. (C) 2015 Elsevier GmbH. All rights reserved.
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  • Maternal osteoporosis after prolonged magnesium sulfate tocolysis therapy: a case report.

    Hung, Jen-Wen   Tsai, Meng-Ying   Yang, Bor-Yau   Chen, Jung-Fu  

    Tocolysis therapy with magnesium sulfate is known to affect calcium homeostasis. Prolonged infusion of magnesium sulfate (MgSO(4)) has been used for the treatment of refractory preterm labor, and has been reported to change maternal calcium homeostasis and possible mineralization. In this case report, we present a woman in her mid thirties who had undergone intravenous MgSO(4) tocolysis therapy, and developed osteoporosis leading to significant morbidity after delivery. The laboratory investigation, including the bone scan, magnetic resonance image, indices of bone turnover, and the results of 2 years of follow-up of bone mineral density, are also reported. This case report supports the existence of a possible association between prolonged intravenous magnesium tocolysis and maternal osteoporosis. To prevent osteoporosis, it is important to avoid a prolonged period of MgSO(4) tocolysis. In cases of prolonged MgSO(4) treatment and bedrest, physicians should be aware of the risk of osteoporosis. The recommended management is also discussed in this report.
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  • Floral morphs and seed production from hand-pollination in a population of Oxalis corymbosa in Taiwan

    Tsai, Meng-Ying   Chen, Su-Hwa   Kao, Wen-Yuan  

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  • Essential covalent linkage between the chymotrypsin-like domain and the extra domain of the SARS-CoV main protease

    Tsai, Meng-Ying   Chang, Wei-Hsin   Liang, Jin-Yi   Lin, Long-Liu   Chang, Gu-Gang  

    The main protease of the coronavirus causing severe acute respiratory syndrome performs proteolytic processing of the viral polyproteins. The active form of the enzyme is a homodimer with each subunit consisting of three structural domains. Domains I and II, hosting the complete catalytic machinery, constitute the N-terminal chymotrypsin-like folding scaffold and connect to the extra C-terminal domain III by a long loop. Previously, the domain III-truncated enzyme was demonstrated to fold independently into an intact chymotrypsin-like fold, but it showed no enzyme activity. To further delineate the structure-function relationships of the domain III and the long loop, we generated some truncated and mutated M-pro forms bearing various combinations of the loop with other structural parts of the enzyme. Their conformational and association properties were investigated in detail. Far-ultraviolet circular dichroism (CD) measurements revealed that these fragments could fold independently. The secondary, tertiary and quaternary structures of these mixtures were monitored by CD, fluorescence spectroscopy and analytical ultracentrifugation. However, no enzyme activity was observed for any mutant or mixtures. These observations indicate that the covalent linkage between the chymotrypsin like and the extra domain is essential for enzymatic activity of the main coronavirus protease and for the integrity of its quaternary structure.
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  • Effectiveness of Treatments and Diagnostic Tools and Declining Mortality in Patients With Severe Sepsis: A 12-Year Population-Based Cohort Study

    Chen, Kuan-Fu   Tsai, Meng-Ying   Wu, Chin-Chieh   Han, Shih-Tsung  

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  • Dual Targeting of the p38 MAPK-HO-1 Axis and cIAP1/XIAP by Demethoxycurcumin Triggers Caspase-Mediated Apoptotic Cell Death in Oral Squamous Cell Carcinoma Cells

    Chien, Ming-Hsien   Yang, Wei-En   Yang, Yi-Chieh   Ku, Chia-Chi   Lee, Wei-Jiunn   Tsai, Meng-Ying   Lin, Chiao-Wen   Yang, Shun-Fa  

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  • Increased prostate cell proliferation and loss of cell differentiation in mice lacking prostate epithelial androgen receptor (vol 104, pg 12679, 2007)

    Wu, Chun-Te   Altuwaijri, Saleh   Ricke, William A.   Huang, Shu-Pin   Yeh, Shuyuan   Zhang, Caixia   Niu, Yuanjie   Tsai, Meng-Ying   Chang, Chawnshang  

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