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111.
Eun-A Jo Rajesh Kumar Tewari Eun-Joo Hahn Kee-Yoeup Paek 《Plant Cell, Tissue and Organ Culture》2009,96(3):307-315
Plantlets of Alocasia amazonica were regenerated on the MS medium supplemented with different concentrations (0–9%) of sucrose. An absence of sucrose in
the growth medium induced generation of leaves, however, it decreased multiplication. On contrary, sucrose supply of 6% or
9% enhanced multiplication but hampered photoautotrophic growth (generation of leaves). Increasing sucrose supply also increased
sugars and starch content and number of stomata and decreased water potential and size of stomata during in vitro growth period.
During ex vitro acclimatization, shoot length, root length, leaf number and root number of Alocasia plantlets grown with 3% sucrose, were found to be better among the other studied sucrose concentrations. Under ex vitro acclimatization,
number of stomata, contents of various carbohydrates in the leaves were increased but size of stomata decreased with increasing
sucrose supply during in vitro growth period. Moreover, water potential of leaves of plantlets, which have been grown with
a sucrose concentration other than 3%, was decreased. During in vitro growth, net CO2 assimilation rate (PN), transpiration (E), stomatal conductance (gs) and variable fluorescence to maximum fluorescence ratio (Fv/Fm) were unaffected, however, during acclimatization these were
changed and maximum PN, E, and gs were observed in the plantlets micropropagated with 3% sucrose. Fv/Fm was decreased severely in the plantlets micropropagated
with 6% sucrose during acclimatization. Thus a sucrose concentration of 3% in the medium is appeared to be better among studied
concentrations for both in vitro growth and ex vitro acclimatization of A. amazonica plantlets. 相似文献
112.
Osama M Al-Bataineh Christopher M Collins Eun-Joo Park Hotaik Lee Nadine Barrie Smith 《Biomedical engineering online》2006,5(1):56-9
Background
Ultrasound induced hyperthermia is a useful adjuvant to radiation therapy in the treatment of prostate cancer. A uniform thermal dose (43°C for 30 minutes) is required within the targeted cancerous volume for effective therapy. This requires specific ultrasound phased array design and appropriate thermometry method. Inhomogeneous, acoustical, three-dimensional (3D) prostate models and economical computational methods provide necessary tools to predict the appropriate shape of hyperthermia phased arrays for better focusing. This research utilizes the k-space computational method and a 3D human prostate model to design an intracavitary ultrasound probe for hyperthermia treatment of prostate cancer. Evaluation of the probe includes ex vivo and in vivo controlled hyperthermia experiments using the noninvasive magnetic resonance imaging (MRI) thermometry. 相似文献113.
Eun-Joo Shin Hai-Quyen Tran Phuong-Tram Nguyen Ji Hoon Jeong Seung-Yeol Nah Choon-Gon Jang Toshitaka Nabeshima Hyoung-Chun Kim 《Neurochemical research》2018,43(1):57-69
Methamphetamine (MA), an amphetamine-type psychostimulant, is associated with dopaminergic toxicity and has a high abuse potential. Numerous in vivo and in vitro studies have suggested that impaired mitochondria are critical in dopaminergic toxicity induced by MA. Mitochondria are important energy-producing organelles with dynamic nature. Evidence indicated that exposure to MA can disturb mitochondrial energetic metabolism by inhibiting the Krebs cycle and electron transport chain. Alterations in mitochondrial dynamic processes, including mitochondrial biogenesis, mitophagy, and fusion/fission, have recently been shown to contribute to dopaminergic toxicity induced by MA. Furthermore, it was demonstrated that MA-induced mitochondrial impairment enhances susceptibility to oxidative stress, pro-apoptosis, and neuroinflammation in a positive feedback loop. Protein kinase Cδ has emerged as a potential mediator between mitochondrial impairment and oxidative stress, pro-apoptosis, or neuroinflammation in MA neurotoxicity. Understanding the role and underlying mechanism of mitochondrial impairment could provide a molecular target to prevent or alleviate dopaminergic toxicity induced by MA. 相似文献