检索结果-南通市图书馆

ESR2–HDA6 complex negatively regulates auxin biosynthesis to delay callus initiation in Arabidopsis leaf explants during tissue culture

在线全文

学校读者我要写书评

暂无评论

Plant Communications 2024年第7期5卷 200-214页

作者： Kyounghee Lee Hobin Yoon ok-sun park Jongbu Lim Sang-Gyu Kim Pil Joon Seo Department of Chemistry Seoul National UniversitySeoul 08826Korea Research Institute of Basic Sciences Seoul National UniversitySeoul 08826Korea Interdisciplinary Program in Agricultural Biotechnology Seoul National UniversitySeoul 08826Korea Plant Genomics and Breeding Institute Seoul National UniversitySeoul 08826Korea Department of Biological Sciences KAISTDaejeon 34141Korea

Plants exhibit an astonishing ability to regulate organ regeneration upon *** of leaf explants promotes the biosynthesis of indole-3-acetic acid(IAA),which is polar-transported to excised regions,where cell fate transition leads to root founder cell specification to induce de novo root *** regeneration capacity of plants has been utilized to develop in vitro tissue culture ***,we report that IAA accumulation near the wounded site of leaf explants is essential for callus formation on 2,4-dichlorophenoxyacetic acid(2,4-D)-rich callus-inducing medium(CIM).Notably,a high concentration of 2,4-D does not compensate for the action of IAA because of its limited efflux;rather,it lowers IAA biosynthesis via a negative feedback mechanism at an early stage of in vitro tissue culture,delaying callus *** auxin negative feedback loop in CIM-cultured leaf explants is mediated by an auxin-inducible APETALA2 transcription factor,ENHANCER OF SHOOT REGENERATION 2(ESR2),along with its interacting partner HISTONE DEACETYLASE 6(HDA6).The ESR2–HDA6 complex binds directly to,and removes the H3ac mark from,the YUCCA1(YUC1),YUC7,and YUC9 loci,consequently repressing auxin biosynthesis and inhibiting cell fate transition on 2,4-D-rich *** findings indicate that negative feedback regulation of auxin biosynthesis by ESR2 and HDA6 interferes with proper cell fate transition and callus initiation.

关键词： auxin biosynthesis negative feedback loop ESR2 HDA6 YUCCA chromatin modification

Adenosine monophosphate enhances callus regeneration competence for de novo plant organogenesis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2023年第12期16卷 1867-1870页

作者： Hong Gil Lee Seo Young Jang Eun Yee Jie Seung Hee Choi ok-sun park Soon Hyung Bae Hyun-Soon Kim Suk Weon Kim Geum-Sook Hwang Pil Joon Seo Department of Chemistry Seoul National UniversitySeoul 08826Korea Plant Genomics and Breeding Institute Seoul National UniversitySeoul 08826Korea Integrated Metabolomics Research Group Western Seoul CenterKorea Basic Science InstituteSeoul 03759Korea Biological Resource Center Korea Research Institute of Bioscience and BiotechnologyJeongeup56212Korea Plant Systems Engineering Research Center Korea Research Institute of Bioscience and BiotechnologyDaejeon 34141Korea College of Pharmacy Chung-Ang UniversitySeoul 06974Korea

Dear Editor,Plant tissue culture involves callus formation and de novo shoot ***,explants from differentiated tissues are used to generate a pluripotent cell mass,called callus,on auxin-rich callus-inducing medium(CIM),followed by shoot regeneration on cytokinin-rich shoot-inducing medium(SiM).Callus results from division of pericycle-like cells(Atta et al.,2009;Sugimoto et al.,2010);its cellular identity resembles that of lateral root primordia(Atta et al.,2009;Sugimoto et al.,2010).Callus acquires cellular pluripotency by forming root stem cell niches on CIM(Sugimoto et al.,2010)。

关键词： Adenosine callus

Effect of herbal medicines with bitter taste on the inhibition of whole blood aggregation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of herbal medicines with bitter taste on the inhibiti...

α-Lipoic acid protects against cholecystokinin-induced acute pancreatitis in rats

第11次中国实验血液学会议

作者： Won Kyung Jeon sun ok park Bo Kyung Yoo Yeong Eun Kim Mi Young ke sun Min park Byoung-Seob Ko Department of Herbal Resources Research Korea Institute of Oriental MedicineDaejeon 305-811Korea Herbal Quality Control Team Korea Institute of Oriental MedicineDaejeon 305-811Korea Herbal Quality Control Team Korea Institute of Oriental MedicineDaejeon 305-811Korea Herbal Quality Control Team Korea Institute of Oriental MedicineDaejeon 305-811Korea Herbal Quality Control Team Korea Institute of Oriental MedicineDaejeon 305-811Korea Department of Food and Nutrition Hoseo UniversityAsanChubgnam 336-795Korea Herbal Quality Control Team Korea Institute of Oriental MedicineDaejeon 305-811Korea

＜正＞For a correlation to study the Five Tastes Theory and efficacies in oriental medicine concepts,we used a traditional classified bitter taste herbal medicines and experimental *** this study,we have tested the in vitro effect of typical 20 kinds of herbal medicines with hitter taste on platelet aggregation in- duced by collagen in human whole blood using the impedance method of *** them,3 kinds of hot water extracts and 2 kinds of 70% etha-

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第31期11卷 4883-4885页

作者： sung-Joo park Sang-Wan Seo ok-sun Choi Cheung-Seog park Department of Pharmacology 1 Hoegi-dong

AIM: α-Lipoic acid (ALA) has been used as an *** aim of this study was to investigate the effect of α-lipoic acid on cholecystokinin (CCK)-octapeptide induced acute pancreatitis in ***: ALA at 1 mg/kg was intra-peritoneally injected, followed by 75 μg/kg CCK-octapeptide injected thrice subcutaneously after 1, 3, and 5 h. This whole procedure was repeated for 5 d. We checked the pancreatic weight/body weight ratio, the secretion of pro-inflammatory cytokines and the levels of lipase,amylase of serum. Repeated CCK octapeptide treatment resulted in typical laboratory and morphological changes of experimentally induced ***: ALA significantly decreased the pancreatic weight/body weight ratio and serum amylase and lipase in CCK octapeptide-induced acute pancreatitis. However,the secretion of IL-1β, IL-6, and TNF-α were comparable in CCK octapeptide-induced acute ***: ALA may have a protective effect against CCK octapeptide-induced acute pancreatitis.

关键词： α-Upoic add AoJte pancreatitis Proinflammatory cytokines Cholecystokinin

Femtosecond laser-mediated anchoring of polymer layers on the surface of a biodegradable metal

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2021年第4期9卷 1380-1388页

作者： Jaeho park Bo-In park Young Ju Son sun Hee Lee Seung-Hoon Um Yu-Chan Kim Myoung-Ryul ok Jeong-Yun sun Hyung-Seop Han Hojeong Jeon Center for Biomaterials Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Materials science and Engineering Seoul National University(SNU)Seoul 08826Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Division of Bio-Medical Science and Technology KIST SchoolKorea University of Science and TechnologySeoul 02792Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea

Mg has received much attention as a next-generation implantable material owing to its biocompatibility,bone-like mechanical properties,and biodegradability in physiological *** application of various polymer coatings has been conducted in the past to reduce the rapid formation of hydrogen gas and the local change in pH during the initial phase of the chemical reaction with the body ***,we propose femtosecond(fs)laser-mediated Mg surface patterning for significant enhancement of the binding strength of the coating material,which eventually reduces the corrosion *** of the structural,physical,crystallographic,and chemical properties of the Mg surface have been conducted in order to understand the mechanism by which the surface adhesion increases between Mg and the polymer coating *** on the fs laser conditions,the surface structure becomes rough owing to the presence of several microscaled pits and grooves of nanoporous MgO,resulting in a tightly bonded poly(lactic-co-glycolic acid)(PLGA)*** corrosion rate of the PLGA-coated,fs laser-treated Mg is considerably slow compared with the non-treated Mg;the treated Mg is also more biocompatible compared with the non-treated *** fs laser-based surface modification technique offers a simple and quick method for introducing a rough coating on Mg;further,it does not require any chemical treatment,thereby overcoming a potential obstacle for its clinical use.

关键词： Femtosecond laser Biodegradable metal Polymer coating Surface modification Surface adhesion

Low-intensity treadmill exercise and/or bright light promote neurogenesis in adult rat brain

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2013年第10期8卷 922-929页

作者： sung Jin Kwon Jeongsook park So Yun park Kwang Seop Song sun Tae Jung So Bong Jung Ik Ryeul park Wan sung Choi sun ok Kwon Department of Physical Education Gyeongsang National University Department of Anatomy and Neurobiology Medical Research Center for Neural DysfunctionInstitute of Health ScienceSchool of MedicineGyeongsang National University Department of Liberal Arts Gyeongnam National University of Science and Technology

The hippocampus is a brain region responsible for learning and memory functions. The purpose of this study was to investigate the effects of low-intensity exercise and bright light exposure on neurogenesis and brain-derived neurotrophic factor expression in adult rat hippocampus. Male Sprague-Dawley rats were randomly assigned to control, exercise, light, or exercise ＋ light groups （n = 9 per group）. The rats in the exercise group were subjected to treadmill exercise （5 days per week, 30 minutes per day, over a 4-week period）, the light group rats were irradiated （5 days per week, 30 minutes per day, 10 000 Ix, over a 4-week period）, the exercise ＋ light group rats were subjected to treadmill exercise in combination with bright light exposure, and the control group rats remained sedentary over a 4-week period. Compared with the control group, there was a significant increase in neurogenesis in the hippocampal dentate gyrus of rats in the exercise, light, and exercise ＋ light groups. Moreover, the expression level of brain-derived neurotrophic factor in the rat hippocampal dentate gyrus was significantly higher in the exercise group and light group than that in the control group. Interestingly, there was no significant difference in brain-derived neurotrophic factor expression between the control group and exercise ＋ light group. These results indicate that low-intensity treadmill exercise （first 5 minutes at a speed of 2 m/min, second 5 minutes at a speed of 5 m/min, and the last 20 minutes at a speed of 8 m/min） or bright-light exposure therapy induces positive biochemical changes in the brain. In view of these findings, we propose that moderate exercise or exposure to sunlight during childhood can be beneficial for neural development.

关键词： neural regeneration neurogenesis neurorehabilitation exercise bright light brain-derivedneurotrophic factor hippocampus childhood grants-supported paper neuroregeneration

Highly efficient reduction of aqueous Cr(VI) with novel ZnO/SnS nanocomposites through the piezoelectric effect

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第8期34卷 57-66页

作者： Hao sun Soo-Jin park Department of Chemistry and Chemical Engineering Inha UniversityIncheon 22212South Korea

In this work, novel ZnO/SnS nanocomposites were successfully synthesized via a hydrothermal approach, which is developed for piezoelectric catalytic reduction of hexavalent chromium(Cr(VI)) in an aqueous solution. The constructed ZnO/SnS nanocomposites exhibited higher catalytic efficiency for Cr(VI) reduction under a mechanical force(e.g., ultrasonic vibration) compared to pristine ZnO and SnS. In particular, the ZnO/SnS(with 30 wt.% of SnS) heterojunctions revealed an optimal degradation activity among all the prepared samples, which completely removed the Cr(VI)(20 mg/L) solution within 35 min. Moreover, the piezoelectric catalytic activity of ZnO/SnS remained stable after four consecutive cycling experiments. The results of the morphology observations indicated that the SnS nanoparticles adhere to the surface of the ZnO nanorods. The improved piezoelectric catalytic performance of the ZnO/SnS heterojunctions can be attributed to the formation of an intimate interfacial between ZnO and SnS, which effectively inhibits the electron-hole recombination and speeds up the rate of charge transfer. The study reveals a new design of ZnO/SnS heterojunctions as a high-performance and eco-friendly piezoelectric catalyst and provides a promising strategy for addressing environmental problems and energy crises.

关键词： Cr(VI)reduction ZnO/SnS Piezoelectric effect

GENERAL DECAY OF A TRANSMISSION PROBLEM FOR KIRCHHOFF TYPE WAVE EQUATIONS WITH BOUNDARY MEMORY CONDITION

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2014年第5期34卷 1395-1403页

作者： sun Hye park Center for Education Accreditation Pusan National University

In this paper, we investigate the influence of boundary dissipation on the de-cay property of solutions for a transmission problem of Kirchhoff type wave equation with boundary memory condition. By introducing suitable energy and Lyapunov functionals, we establish a general decay estimate for the energy, which depends on the behavior of relaxation function.

关键词： transmission problem Kirchhoff type general decay memory term relaxationfunction

STABILITY OF A VON KARMAN EQUATION WITH INFINITE MEMORY

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2017年第4期37卷 965-973页

作者： sun-Hye park Center for Education Accreditation Pusan National UniversityBusan 609-735South Korea

In this paper, we consider a von Karman equation with infinite memory. For yon Karman equations with finite memory, there is a lot of literature concerning on existence of the solutions, decay of the energy, and existence of the attractors. However, there are few results on existence and energy decay rate of the solutions for yon Karman equations with infinite memory. The main goal of the present paper is to generalize previous results by treating infinite history instead of finite history.

关键词： yon Karman equation general decay infinite memory