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microwave assisted synthesis and in silico screening of steroidal pyrazolines

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Chinese Chemical Letters 2012年第9期23卷 1039-1042页

作者： mahboob Alam Shahab A.A.Nami m.Parveen Dong-ung Lee Soonheum Park Division of Bioscience Dongguk UniversityGyeongju 780-714Republic of Korea Department of Chemistry Aligarh Muslim UniversityAligarh 202002India Department of Chemistry Dongguk UniversityGyeongju 780-714Republic of Korea Department of kulliyat Faculty of Unani MedicineAligarh Muslim UniversityAligarh 202002India

The present manuscript describes solid-state synthesis of some reported steroidal pyrazolines by a novel eco-friendly route. The synthesized pyrazolines were compared with those obtained from conventional methods in terms of reaction time and overall yield. A substantial enhancement in reaction rate and yield was observed. The antimicrobial activity and the subsequent molecular docking studies of the steroidal pyrazolines have also been carried out.

关键词： Solid state synthesis Pyrazolines In silico study Antimicrobial study

The Role of Cyclic Nucleotide-Gated Ion Channels in Plant Immunity

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molecular Plant 2011年第3期4卷 442-452页

作者： wolfgang moeder william Urquhart Huoi ung keiko Yoshioka Department of Cell and Systems Biology University of Toronto 25 Willcocks Street Toronto ON M5S 3B2 Canada Center for the Analysis of Genome Evolution and Function (CAGEF) University of Toronto 25 Willcocks Street Toronto ON M5S 3B2 Canada

Since the first plant cyclic nucleotide-gated ion channel （CNGC）, HvCBT1, was identified as a calmodulin bind- ing protein, more than a decade has passed and a substantial amount of work has been done to understand the molecular nature and function of these channel proteins. Based on electrophysiological and heterologous expression analyses, plant CNGCs function as non-selective cation channels and, so far, their biological roles have been reported in defense responses, development, and ion homeostasis. Forward genetic approaches identified four AtCNGCs （AtCNGC2, 4, 11, and 12） to be involved in plant immunity, as null mutants for AtCNGC2, 4, 11, and 12 as well as a gain-of- function mutant for AtCNGC11 and 12 exhibited alterations in defense responses. Since ion flux changes have been reported as one of the early events upon pathogen recognition and also are an essential component for the activation of defense responses, the involvement of CNGCs in these ion flux changes has been suggested. However, the recent detailed characterization of null mutants suggested a more complex involvement of this channel family. In this review, we focus on the discoveries and character- ization of these CNGC mutants and discuss possible roles of CNGCs as components in plant immunity.

关键词： CNGC cyclic nucleotide-gated ion channel plant immunity DND1 DND2 HLm1 CPR22 ED51.

Carbon Dioxide Concentration and Flux in an Urban Residential Area in Seoul,korea

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Advances in Atmospheric Sciences 2014年第5期31卷 1101-1112页

作者： moon-Soo PARk Seung Jin JOO Soon-ung PARk weather Information Service Engine Center for Atmospheric Science & Earthquake ResearchSeoul 121-835 Korea Center for Atmospheric and Environmental modeling Seoul 152-775 Korea

The carbon dioxide （CO2） concentrations and fluxes measured at a height of 17.5 m above the ground by a sonic anemometer and an open-path gas analyzer at an urban residential site in Seoul, korea from February 2011 to January 2012 were analyzed. The annual mean CO2 concentration was found to be 750 mg m-3, with a maximum monthly mean concentration of 827 mg m-3 in January and a minimum value of 679 mg m-3 in August. meanwhile, the annual mean CO2 flux was found to be 0.45 mg m-2 s-1, with a maximum monthly mean flux of 0.91 mg m-2 s-1 in January and a minimum value of 0.19 mg m-2 s-1 in June. The hourly mean CO2 concentration was found to show a significant diurnal variation; a maximum at 0700-0900 LST and a minimum at 1400-1600 LST, with a large diurnal range in winter and a small one in summer, mainly caused by diurnal changes in mixing height, CO2 flux, and surface complexity. The hourly mean CO2 flux was also found to show a significant diurnal variation, but it showed two maxima at 0700-0900 LST and 2100-2400 LST, and two minima at 1100-1500 LST and 0300-0500 LST, mainly caused by a diurnal pattern in CO2 emissions and sinks from road traffic, domestic heating and cooking by liquefied natural gas use, and the different horizontal distribution of CO2 sources and sinks near the site. Differential advection with respect to wind direction was also found to be a cause of diurnal variations in both the CO2 concentration and flux.

关键词： CO2 concentration CO2 flux liquefied natural gas (LNG) Seoul urban residential area

Recent advances in electronic devices for monitoring and modulation of brain

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Nano Research 2021年第9期14卷 3070-3095页

作者： Yong won kwon Yoon Sun Jun Young-Geun Park Jiuk Jang Jang-ung Park Nano Science Technology Institute Department of Materials Science and EngineeringYonsei UniversitySeoul 03722Republic of Korea Center for Nanomedicine Institute for Basic Science(IBS)Seoul 03722Republic of Korea Graduate Program of Nano Biomedical Engineering(NanoBmE) Advanced Science InstituteYonsei UniversitySeoul 03722Republic of Korea

The brain is actuated by billions of neurons with trillions of interconnections that regulate human *** the mechanisms of these systems that induce sensory reactions and respond to disease remains one of the greatest challenges in science,engineering,and *** advances in nanomaterials and nanotechnologies have led to the extensive research of electronic devices for brain interfaces to better understand the neural activities of the brains complex nervous *** development of sensor devices for monitoring the physiological signals of the brain related to traumatic injury status has accompanied by the progress of electronic neural probes in *** addition,these neurological and stereotactic surgical revolutions hold immense potential for clinical analysis of pharmacological systems within cerebral ***,we review the progress of electronic devices interfacing with brain in terms of the materials,fabrication technologies,and device *** activity can be measured and modulated by brain probes based on newly developed nanofabrication ***,in vivo pathological monitoring of the brain and pharmacological assessment has been developed in miniaturized and wireless *** also consider the key challenges and prospects for further development,and explore the future directions emerging in the latest research.

关键词： neural interfaces neural recording neuromodulation intracranial pressure monitoring microfluidic drug delivery

Development of Environmentally Friendly and Energy Efficient Refrigerants for Refrigeration Systems

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Energy Engineering 2021年第2期118卷 411-433页

作者： Piyanut Saengsikhiao Juntakan Taweekun kittinan maliwan Somchai Sae-ung Thanansak Theppaya Energy Technology Program Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla90112Thailand Department of mechanical Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla90112Thailand

This paper presents the improvement of eco-friendly and power consumption saving refrigerants for refrigeration *** novel azeotropic refrigerant mixtures of HFCs and HCs can replace refrigeration systems,and using the R134,R32,R125,and R1270 refrigerants in several compositions found using the decision tree function of the Rapidminer software(which camefirst in the kDnuggets annual software poll).All refrigerant results are mixed of POE,which is A1 classification refrigerant,non-flammable,and innocuous refrigerant,and using REFPROP software and CYCLE_D-HX software are under the CAN/ANSI/AHRI540 *** boiling point of the new refrigerant mix R-No.595 is 4.58%,lower than that of R404A,with a higher refrigerant effect and 50.34%lower GwP value than *** proposed mix R-No.595 can be operated in hot environmental country and has high critical temperature and heat-rejection effects,due to the presence of R32 and *** COPc of R463A is 13.49%,higher than R404A in freeze *** novel refrigerant mixes provide alternate refrig-erant options mixed of 1%R1270,and which are related with the development of current refrigerants,containing a compose of HFOs and eco refrigerants for producing low-GwP,zero ODP,high-refrigerant effect,low-operating pressure,and innocuous refrigerants.

关键词： Refrigerant refrigeration system energy efficiency environmentally friendly data mining

metal−Organic Fram.works as a Subnanometer Platform for Ion−Ion Selectivity

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Accounts of materials Research 2022年第7期3卷 735-747页

作者： Jun Lu Xiaoyi Hu kevin m.ung Yinlong Zhu Xiwang Zhang Huanting wang Department of Chemical and Biological Engineering Monash Centre for Membrane InnovationMonash UniversityClaytonVictoria 3800Australia Department of Chemical and Biological Engineering Monash UniversityClaytonVictoria 3800Australia Institute for Frontier Science Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Chemical Engineering Dow Centre for Sustainable Engineering InnovationThe University of QueenslandSt LuciaQueensland 4072Australia

CONSPECTUS:Selective ion transport in nanoporous membranes has become a research hot spot in the fields of both nanofluidics and membrane separation because of its wide potential applications,such as ion separation,energy harvesting and conversion,and ion *** nanofluidic devices or membranes with nanoconfined to subnanoconfined space is the core part of nanofluidic studies because the materials used to construct nanofluidic devices determine the exploration potential of the ion-transport performance.

关键词： separation harvesting confined

Flexible electronics based on one-dimensional and two-dimensional hybrid nanomaterials

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Infomat 2020年第1期2卷 33-56页

作者： Jihun Park Jae Chul Hwang Gon Guk kim Jang-ung Park Department of materials Science and Engineering Nano Science Technology InstituteYonsei UniversitySeoulRepublic of Korea Center for Nanomedicine Institute for Basic Science(IBS)Yonsei-IBS InstituteSeoulRepublic of Korea

Research on flexible or wearable electronics has been grown remarkably due to the advent of nanomaterials,such as metal nanowires,graphene,or transition metal *** each nanomaterial has mechanical and electrical characteristics that can be applied into flexible electronics,the limitations of each nanomaterial are also *** order to overcome the limitations of these nanomaterials,research on the hybrid structures of nanomaterials has been extensively *** this study,we introduce the properties of one-dimensional nanomaterials,twodimensional nanomaterials,and their hybrid *** then,we provide information concerning various flexible electronics based on these nanomaterials.

关键词： flexible electronics hybrid nanomaterials one-dimensional nanomaterials two-dimensional nanomaterials wearable electronics

Experiment on Dust Flux During Duststorm Periods over Desert Area

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Acta meteorologica Sinica 2008年第2期22卷 239-247页

作者：张宏升朱好彭艳康凌陈家宜 Soon-ung PARk Center of Sino-korcan Atmospheric Sciences Department of Atmospheric SciencesPeking University Center of Sino-korean Atmospheric Sciences Department of Atmospheric SciencesPeking University Center of Sino-korean Atmospheric Sciences Department of Atmospheric SciencesSeoul National UniversitySeoul 151-742Korea

The present study investigates the characteristics of turbulent transfer and the conditions for dust emission and transport using the dust concentration and micrometeorological data obtained during dust events occurring in the spring of 2004 over the Hunshandake desert area. The turbulent exchange coefficients and turbulent fluxes of momentum and heat are calculated. The relationships between dust flux, friction velocity, and wind speed are also explored. The results show that thermal turbulence is dominant during daytime of non-dusty days. The dynamic turbulence increases obviously and the sensible heat flux reduces by different degrees during dust events. There is an efficient downward transfer of momentum before duststorm occurrence, and both the dynamic turbulence and the thermal turbulence are important in the surface layer. The dynamic turbulence even exceeds the thermal turbulence during severe duststorm events. The values of dust flux vary in the range of -5 5, -30 30, and -200-300 μg m^-2 s^-1 during non-dusty days, blowing dust, and duststorm events, respectively. A slight upward transport of dust is observed during non-dusty days. The dust flux gradually varies from positive to negative during duststorm periods, which indicates the time evolution of dust events from dust rising to stably suspending and then deposition. The dust flux is found to be proportional to u＊^3. The threshold values of wind speed and friction velocity are about 6 and 0.4 m s^-1, respectively.

关键词： turbulent transfer dust flux threshold friction velocity dust event Hunshandake desert area

An Approach to Quantify Endomembrane Dynamics in Pollen Utilizing Bioactive Chemicals

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molecular Plant 2013年第4期6卷 1202-1213页

作者： Nolan ung michelle Q. Brown Glenn R. Hicks Natasha V. Raikhel Center for Plant Cell Biology and Department of Botany and Plant Sciences University of California Riverside Riverside CA 92521 USA

Tip growth of pollen tubes and root hairs occurs via rapid polar growth. These rapidly elongating cells require tip-focused endomembrane trafficking for the deposition and recycling of proteins, membranes, and cell wall materials. most of the image-based data published to date are subjective and non-quantified. Quantitative and com- parative descriptors of these highly dynamic processes have been a major challenge, but are highly desirable for genetic and chemical genomics approaches to dissect this biological network. To address this problem, we screened for small molecules that perturbed the localization of a marker for the Golgi Ras-like monomeric G-protein RAB2：GFP expressed in transgenic tobacco pollen. Semi-automated high-throughput imaging and image analysis resulted in the identifica- tion of novel compounds that altered pollen tube development and endomembrane trafficking. Six compounds that caused mislocalization and varying degrees of altered movement of RAB2：GFP-labeled endomembrane bodies were used to generate a training set of image data from.which to quantify vesicle dynamics. The area, velocity, straightness, and intensity of each body were quantified using semi-automated image analysis tools revealing quantitative differences in the phenotype caused by each compound. A score was then given to each compound enabling quantitative comparisons between compounds. Our results demonstrate that image analysis can be used to quantitatively evaluate dynamic sub- cellular endomembrane phenotypes induced by bioactive chemicals, mutations, or other perturbing agents as part of a strategy to quantitatively dissect the endomembrane network.

关键词： endomembranes vesicle trafficking quantification pollen chemical biology.