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cytokinetic abscission is an acute G1 event

cELL cYcLE 2014年第21期13卷 3436-3441页

作者： Gershony, Ofir Pe'er, Tal Noach-Hirsh, Meirav Elia, Natalie Tzur, Amit Bar Ilan Univ Mina & Everard Goodman Fac Life Sci Ramat Gan Israel Bar Ilan Univ Inst Nanotechnol & Adv Mat Ramat Gan Israel Ben Gurion Univ Negev Dept Life Sci IL-84105 Beer Sheva Israel Ben Gurion Univ Negev Natl Inst Biotechnol Negev IL-84105 Beer Sheva Israel

Animal cell division ends with the cutting of the microtubule and membrane intercellular bridge connecting the 2 daughter cells. This process, known as cytokinetic abscission (abscission), is widely regarded as the last step of cytokinesis, i.e., the last step of the cell cycle. Major breakthroughs have been recently achieved, illuminating mechanistic aspects of abscission;however, the timing of abscission with respect to the mammalian cell cycle remains unclear. In this study, we carefully measured the onset and progression of abscission in dividing cells expressing a G1 reporter. We conclude that abscission commences long after cells enter the G1 phase. Affiliating abscission with G1 is beyond semantics since it essentially postulates that the last step of the cell cycle is regulated in, and probably by, the following cycle.

关键词： Abscission Aurora APc c cell cycle cell division cytokinesis constriction site cHMP cep55 EScRT III Gas2l3 Mitosis Plk1 Spastin

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comparative optimisation of biohythane production from starch wastewater by one-stage and two-stage anaerobic digestion

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INTERNATIONAL JOURNAL OF ENVIRONMENT AND WASTE MANAGEMENT 2021年第3期27卷 292-309页

作者： Warrajareansri, chakkaphop Wongthanate, Jaruwan Mahidol Univ Fac Environm & Resource Studies 999 Phutthamonthon 4 Rd Phutthamonthon 73170 Nakhon Pathom Thailand

Now, energy crisis was the problem in the world. This research was study the biohythane production for renewable energy. The experiment was optimised using starch by one-stage and two-stage anaerobic digestion in batch reactor. For two-stage, the optimal conditions of biohythane production were pH 7.0, thermophilic temperature, c/N ratio 30 for a first step (hydrogen yield 63.65 mL H-2/g cOD) and pH 7.5, thermophilic temperature, c/N ratio 30 for a second step (methane yield 184.59 mL cH4/g cOD). Furthermore, one-stage was achieved at an initial pH 7.5 under thermophilic temperature and c/N ratio 30 (methane yield 206.47 mL cH4/g cOD). At optimal conditions, the maximum cOD removal of two-stage (73.75%) was higher than that of one-stage (68.70%). Overall bioenergy recovery of two-stage was more generation than that of one-stage, including utilisation of organic matter at the same time.

关键词： biohythane production starch wastewater pH c N ratio one-stage anaerobic digestion two-stage anaerobic digestion

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In situ study of field emission vacuum breakdown of individual multi-wall carbon nanotube

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MIcRO & NANO LETTERS 2019年第2期14卷 206-210页

作者： Liu, Zhenkun Zhang, Yu Zhao, Peng Ye, Yuan chen, Jun Xu, Ningsheng Deng, Shaozhi Sun Yat Sen Univ Sch Elect & Informat Technol State Key Lab Optoelect Mat & Technol Guangdong Prov Key Lab Display Mat & Technol Guangzhou 510275 Guangdong Peoples R China

The vacuum breakdown critical condition of individual carbon nanotube (cNT) during field emission was investigated experimentally using the in-situ field emission combined scanning electron microscope system. The results showed that the critical breakdown electric field of cNT was related to its length and diameter. cNT which has a shorter length and larger diameter could bear higher electric field. The underlying mechanism was attributed to the heat dissipation ability of cNT. A smaller length and larger diameter cNT has better heat dissipation. The results met with the theoretical calculations and helped to understand the physics mechanism of vacuum breakdown of cNT during field emission in a visual perspective.

关键词： field emission scanning electron microscopy vacuum breakdown multi-wall carbon nanotubes cooling field emission vacuum breakdown multiwall carbon nanotube in-situ field emission combined scanning electron microscope system critical breakdown electric field heat dissipation ability electric field c

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Doping effect on shift of threshold voltage of graphene-based field-effect transistors

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ELEcTRONIcS LETTERS 2011年第11期47卷 663-U50页

作者： Guo, B. Fang, L. Zhang, B. Gong, J. R. Chongqing Univ Dept Appl Phys Chongqing 400044 Peoples R China Natl Ctr Nanosci & Technol Lab Nanodevices Beijing 100190 Peoples R China

A method of controllable doping by ion irradiation in reduced graphene oxide (RGO) is presented, and the threshold voltage of the RGO-based field-effect transistor can be finely tuned in the range from more than 30 V to about -20 V using this approach. Evidence of doping was also provided by Raman spectroscopy and Fourier transform infrared spectroscopy.

关键词： c Fourier transform infrared spectroscopy Fourier transform spectra Raman spectroscopy Raman spectroscopy controllable doping doping effect field effect transistors graphene graphene-based field-effect transistor infrared spectra ion irradiation reduced graphene oxide semiconductor doping threshold voltage

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Effect of surfactant type on buckypaper electrochemical performance

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MIcRO & NANO LETTERS 2018年第7期13卷 927-930页

作者： Vahid, Nadia Farsaei Marvi, Mohammad Reza Naimi-Jamal, Mohammad Reza Naghib, Seyed Morteza Ghaffarinejad, Ali Iran Univ Sci & Technol Dept Chem Res Lab Green Organ Synth & Polymers POB 16846-13114 Tehran Iran Iran Univ Sci & Technol Sch New Technol Nanotechnol Dept Tehran Iran Iran Univ Sci & Technol Dept Chem Res Lab Real Samples Anal Tehran Iran

In this work, buckypapers (BPs) were synthesised by different types of non-ionic surfactants. The prepared BPs were characterised by different methods. Using of non-ionic and also non-toxic surfactant, Tween 20, made the surface possible to immobilise the biological molecules on the surface for measuring the electrochemical properties changes. Moreover, this surface showed better electrochemical behaviour, higher conductivity, and better charge transfer kinetics than BP which was synthesised by conventional Triton X100. To our knowledge, this is the first research on the effect of surfactant type on the BP synthesis and characteristics.

关键词： carbon nanotubes nanofabrication electrochemistry surfactants electrical conductivity charge exchange buckypaper electrochemical performance nonionic surfactants nontoxic surfactant Tween 20 biological molecules electrical conductivity charge transfer kinetics Triton X100 plate-like carbon nanotube films c

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Non-destructive and controllable catalyst deposition of in situ growing carbon nanotubes onto the carbon fibre fabric

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MIcRO & NANO LETTERS 2011年第9期6卷 770-773页

作者： Ren, chong Gong, Qianming Liang, Ji Tsinghua Univ Dept Mech Engn Beijing 100084 Peoples R China Minist Educ China Key Lab Adv Mat Proc Technol Beijing 100084 Peoples R China

To in situ grow carbon nanotubes (cNTs) on the surface of carbon fibre fabric (cFF) with suitable diameter and uniform distribution, controllable catalyst deposition is the key process. A controllable and non-destructive pre-treatment, that is, electrochemical oxidation pre-treatment, was explored to facilitate uniform 'seeding' nano-sized catalyst particles on the surface of cFF without causing damage to carbon fibres. Main factors, such as voltage, concentration of electrolyte, electrolytic time, catalyst type and concentration of the catalyst precursor, were investigated. X-ray photoelectron spectroscopy tests indicated that voltage, concentration of electrolyte and duration of electrochemical treatment determined the distribution density of catalyst nanoparticles by controlling the concentration of the functional groups, while the diameter of catalyst particles was decided by the concentration of Fe(NO(3))(3) and cO(NH(2))(2). Besides, the diameter of catalyst particles could be modulated by adding Al(NO(3))(3) in the solution of the catalyst precursor. At the same time, to avoid cementite produced during the calcination and reduction process, the temperature should be controlled below 773 K. Scanning electron microscopy observations indicated that well-dispersed in situ grown cNTs could be obtained after cFF had been chemical oxidised at the voltage of 10 V for 10 s with 0.02 M NH(4)HcO(3) as electrolyte and followed by catalyst deposition.

关键词： nanosized catalyst particle seeding Other heat and thermomechanical treatments nanoparticles in situ growing carbon nanotubes reduction process electrochemical oxidation pretreatment c electrolytic time reaction mechanisms nondestructive catalyst deposition calcination carbon fibre fabric surface carbon fibres controllable catalyst deposition Heterogeneous catalysis at surfaces and other surface reactions scanning electron microscopy oxidation Specific chemical reactions Electrochemistry and electrophoresis electrolyte concentration reduction (chemical) voltage 10 V functional groups X-ray photoelectron spectra Photoelectron spectra of semiconductors and insulators carbon nanotubes catalysts electrolytes X-ray photoelectron spectroscopy time 10 s Electron spectroscopy for chemical analysis (photoelectron, Auger spectroscopy, etc.) cementite

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Synthesis of vertical graphene flowers as a photoelectrocatalyst for organic degradation

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MIcRO & NANO LETTERS 2017年第4期12卷 252-254页

作者： Tian, Fangyuan Li, Hongji Li, Mingji Tianjin Univ Technol Sch Chem & Chem Engn Tianjin Key Lab Organ Solar Cells & Photochem Con Tianjin 300384 Peoples R China Tianjin Univ Technol Sch Elect Informat Engn Tianjin Key Lab Film Elect & Communicate Devices Tianjin 300384 Peoples R China

Three-dimensional vertical graphene flowers were fabricated using a simple, low-cost, and efficient chemical vapour deposition method with Ni(NO3)(2) as a catalyst precursor and methane as a carbon precursor. Graphene flowers of up to 10 mu m in size with petals of two to seven layers of graphene were obtained. The growth of the vertically aligned graphene flowers was attributed to a columnar growth mechanism. Numerous micropores were observed between the flower petals and irregular mesopores were observed in the interconnected flowers. The charge-transfer resistance of a graphene flower/Ta film was 30.8 Omega. The graphene flowers acted as charge carriers, reducing the charge recombination rate and enhancing electron transport. The vertical graphene flowers showed significant photoelectrocatalytic activity for the degradation of phenol.

关键词： graphene organic compounds photodissociation photoelectrochemistry catalysis catalysts chemical vapour deposition mesoporous materials charge exchange electron-hole recombination three-dimensional vertical graphene flowers photoelectrocatalyst organic degradation chemical vapour deposition catalyst precursor methane carbon precursor columnar growth mechanism micropores flower petals irregular mesopores interconnected flowers charge-transfer resistance charge carriers charge recombination rate electron transport photoelectrocatalytic activity phenol degradation c Ta

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Surface analysis of nickel nanomaterials electrodeposited on graphite surface

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MIcRO & NANO LETTERS 2019年第12期14卷 1233-1237页

作者： Saldan, Ivan Lewin, Erik Dobrovetska, Oksana Karlsson, Dennis Bilan, Oleh Kuntyi, Orest Ivan Franko Natl Univ Lviv Fac Chem Kyryla & Mefodia 6 UA-79005 Lvov Ukraine Uppsala Univ Dept Chem Angstrom Lab Box 538 S-75121 Uppsala Sweden Lviv Polytech Natl Univ Inst Chem & Chem Technol Bandery 12 UA-79013 Lvov Ukraine Ind Co Autonomous Power Sources Lvivska 2 UA-80074 Velyki Mosty Ukraine

Pure Nickel (Ni) and Nickel-Palladium (Ni-Pd) alloy were electrodeposited on graphite surface via pulse electrolysis in dimethyl sulfoxide in form of rods and nanoparticles with a diameter of similar to 100-350 and similar to 10-35 nm, respectively. X-ray photoelectron spectroscopy (XPS) spectra of Ni 2p(3/2) region for these nanomaterials suggests on their surface Ni2+ precursor while after Ar+ ion-etching metallic nickel starts to be dominated. Both Pd-0 and Pd2+ for XPS spectra of Pd 3d(5/2) and 3d(3/2) were observed after electrodeposition. Scanning electron microscope-energy dispersive X-ray and XPS analysis confirmed electrodeposition of nickel nanomaterials in non-aqueous electrolyte. Using a lower concentration of Ni2+ precursor, nanoparticles with an average particle size of similar to 10-23 nm were prepared on a graphite surface.

关键词： particle size nanoparticles nickel graphite nanofabrication electrodeposition X-ray photoelectron spectra electrolysis etching X-ray chemical analysis scanning electron microscopy palladium alloys nickel alloys c Ni NiPd particle size nonaqueous electrolyte Ar+ ion-etching metallic nickel surface Ni2+ precursor dimethyl sulfoxide pulse electrolysis nickel-palladium alloy electron microscope-energy dispersive X-ray analysis electrodeposition XPS spectra ion-etching metallic nickel X-ray photoelectron spectroscopy spectra graphite surface nickel nanomaterials surface analysis

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Fabrication of poly-Si thick films by electrophoretic deposition

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ELEcTRONIcS LETTERS 2001年第17期37卷 1090-1092页

作者： Hossein-Babaei, F Raissi-Dehkordi, B KN Toosi Univ Technol Dept Elect Engn Tehran Iran Mat & Energy Res Ctr Div Ceram Tehran Iran

The electrophoresis of silicon particles in acetone, and the electrophoretic deposition of poly-silicon thick films are reported for the first time. The anodic deposition of Si particles was achieved by applying Dc electric fields of similar to 100 V/cm between two electrodes soaked in a semistable acetone suspension. Uniform layers Were reproducibly formed on gold, graphite and silicon wafer anodes (substrates). The technique was successfully applied on substrates of complicated shapes.

关键词： polysilicon thick films poly-Si thick films semistable acetone suspension electrophoresis Au thick films electrophoretic deposition Deposition from liquid phases (melts and solutions) electrophoretic coating techniques semiconductor growth Thin film growth, structure, and epitaxy silicon wafer anodes anodic deposition graphite substrate gold substrate Si Deposition from liquid phases elemental semiconductors silicon Dc electric fields 10 to 50 mum acetone semiconductor thin films c silicon particles uniform layers complicated shape substrates Elemental semiconductors

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Facile synthesis and characterisation of green luminescent carbon nanodots prepared from tender coconut water using the acid-assisted ultrasonic route

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MIcRO & NANO LETTERS 2020年第13期15卷 920-924页

作者： Manoharan, Preethi Dhanabalan, Sathish chander Alagan, Muthulakshmi Muthuvijayan, Santhoshbalaji Ponraj, Joice Sophia Somasundaram, chandra Kishore Bharathiar Univ Dept Nanosci & Technol Coimbatore Tamil Nadu India Aaivalayam Dynam Intergrated Res Acad & Corp A DI Ctr Adv Mat Intergrated Interdept LiWET Commun Coimbatore 641046 Tamil Nadu India Univ Informat Sci & Technol St Paul Apostle Fac Informat & Commun Sci Ohrid North Macedonia

In the present investigation, the authors have adopted a simple and economical method for the synthesis of bright green photoluminescent carbon nanodots (cNDs) from tender coconut water via acid-assisted ultrasonic route. Tender coconut water is used as a less expensive and eco-friendly carbon precursor to produce well-dispersed cNDs possessing a hybrid structural behaviour of both nanocrystalline and amorphous carbon phases. The monodispersed cNDs with spherical morphology and particle size (4 +/- 1 nm) were confirmed with the aid of high-resolution transmission electron microscopy. The functional groups attached to cNDs are held responsible for the fluorescence nature and mono-dispersion that were assessed using Fourier transform infrared spectroscopy. The green fluorescence nature of cNDs was evaluated at a maximum emission at 510 nm with an excitation wavelength of 450 nm, using ultraviolet-visible absorption spectrum and photoluminescence spectra. The cNDs with a carbon core and chemical groups over their surface exhibited a fluorescence quantum yield of 60.18%. The stability, low-cost precursor, rapid reaction and uniform dispersion without chemical functionalisation makes these cNDs synthesised from tender coconut water more advantageous than other sources. This research mainly emphasis on synthesis and characterisation of cNDs with a detailed mechanism for cND formation.

关键词： nanoparticles photoluminescence ultraviolet spectra visible spectra transmission electron microscopy carbon X-ray diffraction fluorescence particle size ultrasonic applications nanofabrication Fourier transform infrared spectra amorphous state crystal morphology tender coconut water photoluminescent carbon nanodots amorphous carbon phase monodispersed carbon nanodots chemical groups acid-assisted ultrasonic method nanocrystalline carbon phase ultraviolet–visible absorption spectrum fluorescence quantum yield high-resolution transmission electron microscopy spherical morphology particle size functional groups Fourier transform infrared spectroscopy X-ray diffraction c

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