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Gao W, He M, Liu J, Ma X, Zhang Y, Dai S, Zhou Y. Overexpression of Chrysanthemum lavandulifolium ClCBF1 in Chrysanthemum morifolium 'White Snow' improves the level of salinity and drought tolerance. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2018; 124:50-58. [PMID: 29331925 DOI: 10.1016/j.plaphy.2018.01.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 01/03/2018] [Accepted: 01/05/2018] [Indexed: 05/21/2023]
Abstract
This paper reports the first study on plant CBF transcription factors (TF) in salt and drought stress responses in Chrysanthemum lavandulifolium. A CBF homolog gene, named as ClCBF1, from C. lavandulifolium was isolated using rapid amplification of cDNA ends (RACE). The deduced peptide is comprised of 210 amino acids (AA) containing an AP2 structural domain characteristic of the AP2 gene family. Quantitative real-time PCR revealed that ClCBF1 gene exhibit differential expression patterns across root, leaf and stem tissues, and it was strongly induced under salt and drought treatments of C. lavandulifolium. Overexpression of ClCBF1 in C. morifolium 'White Snow' resulted in stronger tolerance to salt and drought stresses. The ClCBF1 expression level, enzymatic activities of superoxide dismutase and peroxidase, and contents of proline and soluble proteins were enhanced in these transgenic lines, they were repressed in the antisense transgenic lines under the same stress conditions. Results indicate that ClCBF1 represents a promising candidate gene in improving abiotic stress tolerance among ornamental plants.
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Chong CF, Misra SL, Escardo-Paton JA, Dai S. Predictors of long-term neurological outcomes in non-accidental head injury. Eye (Lond) 2017; 32:608-614. [PMID: 29219962 DOI: 10.1038/eye.2017.266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Accepted: 10/25/2017] [Indexed: 11/09/2022] Open
Abstract
BackgroundNon-accidental head injury (NAI) is an inflicted injury usually on a child, often resulting in long-term neurological impairment and occasionally death. This study aimed to investigate the predictive values of acute findings, especially ocular, for long-term neurological outcomes.MethodsMedical records including retinal images of all children who attended the local Children's hospital with a diagnosis of NAI from over a period of 5 years were reviewed and data collected via the electronic patient record system. Patient demographics, injuries sustained, wide-field digital retinal images, visual acuity and sequalae, neurological function, and global function was noted. IBM SPSS software program was used for statistical analysis.ResultsOf the 38 patients (24 males, 14 females), 12 children died acutely from the head injury with the remaining 26 children available for long-term follow-up. A younger age of injury (P=0.004) was the only statistically significant predictor of good neurological outcome as compared with absence of macular retinoschisis, unilateral retinal haemorrhage, and unilateral subdural haemorrhage. Of the 38 children, 17 children had retinoschisis; 9 children with macular retinoschisis died acutely while 4 suffered a degree of developmental delay and only 4 were developmentally normal at the last follow-up. Long-term visual acuity data was available for 18 of the 26 survivors (range: NPL to Snellen 6/5). A statistical significance was noted between retinoschisis and worsened visual acuity (P<0.05).ConclusionsBilateral macular retinoschisis on acute presentation of NAI is associated with a seven-fold and unilateral with a four-fold increase in the development of a poor neurological outcome and eventual death. Conflicting to other studies, younger children presented better neurological outcomes.
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Hu F, Luan Y, Fei Z, Palubski IZ, Goldflam MD, Dai S, Wu JS, Post KW, Janssen GCAM, Fogler MM, Basov DN. Imaging the Localized Plasmon Resonance Modes in Graphene Nanoribbons. NANO LETTERS 2017; 17:5423-5428. [PMID: 28806525 DOI: 10.1021/acs.nanolett.7b02029] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We report a nanoinfrared (IR) imaging study of the localized plasmon resonance modes of graphene nanoribbons (GNRs) using a scattering-type scanning near-field optical microscope (s-SNOM). By comparing the imaging data of GNRs that are aligned parallel and perpendicular to the in-plane component of the excitation laser field, we observed symmetric and asymmetric plasmonic interference fringes, respectively. Theoretical analysis indicates that the asymmetric fringes are formed due to the interplay between the localized surface plasmon resonance (SPR) mode excited by the GNRs and the propagative surface plasmon polariton (SPP) mode launched by the s-SNOM tip. With rigorous simulations, we reproduce the observed fringe patterns and address quantitatively the role of the s-SNOM tip on both the SPR and SPP modes. Furthermore, we have seen real-space signatures of both the dipole and higher-order SPR modes by varying the ribbon width.
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Li Y, Sun H, Zhang C, Liu J, Zhang H, Fan F, Everley RA, Ning X, Sun Y, Hu J, Liu J, Zhang J, Ye W, Qiu X, Dai S, Liu B, Xu H, Fu S, Gygi SP, Zhou C. Identification of translationally controlled tumor protein in promotion of DNA homologous recombination repair in cancer cells by affinity proteomics. Oncogene 2017; 36:6839-6849. [PMID: 28846114 PMCID: PMC5735297 DOI: 10.1038/onc.2017.289] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 06/09/2017] [Accepted: 07/13/2017] [Indexed: 01/21/2023]
Abstract
Translationally controlled tumor protein(TCTP) has been implicated in the regulation of apoptosis, DNA repair and drug resistance. However, the underlying molecular mechanisms are poorly defined. To better understand the molecular mechanisms underlying TCTP involved in cellular processes, we performed an affinity purification-based proteomic profiling to identify proteins interacting with TCTP in human cervical cancer HeLa cells. We found that a group of proteins involved in DNA repair are enriched in the potential TCTP interactome. Silencing TCTP by short hairpin RNA in breast carcinoma MCF-7 cells leads to the declined repair efficiency for DNA double-strand breaks on the GFP-Pem1 reporter gene by homologous recombination, the persistent activation and the prolonged retention of γH2AX and Rad51 foci following ionizing radiation. Reciprocal immunoprecipitations indicated that TCTP forms complexes with Rad51 in vivo, and the stability maintenance of Rad51 requires TCTP in MCF-7 cells under normal cell culture conditions. Moreover, inactivation of TCTP by sertraline treatment enhances UVC irradiation-induced apoptosis in MCF-7 cells, and causes sensitization to DNA-damaging drug etoposide and DNA repair inhibitor olaparib. Thus, we have identified an important role of TCTP in promoting DNA double-stand break repair via facilitating DNA homologous recombination processes and highlighted the great potential of TCTP as a drug target to enhance conventional chemotherapy for cancer patients with high levels of TCTP expression.
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Fleck BW, Williams C, Juszczak E, Cocker K, Stenson BJ, Darlow BA, Dai S, Gole GA, Quinn GE, Wallace DK, Ells A, Carden S, Butler L, Clark D, Elder J, Wilson C, Biswas S, Shafiq A, King A, Brocklehurst P, Fielder AR. An international comparison of retinopathy of prematurity grading performance within the Benefits of Oxygen Saturation Targeting II trials. Eye (Lond) 2017; 32:74-80. [PMID: 28752837 PMCID: PMC5669461 DOI: 10.1038/eye.2017.150] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 06/21/2017] [Indexed: 12/19/2022] Open
Abstract
Purpose To investigate whether the observed international differences in retinopathy of prematurity (ROP) treatment rates within the Benefits of Oxygen Saturation Targeting (BOOST) II trials might have been caused by international variation in ROP disease grading. Methods Groups of BOOST II trial ophthalmologists in UK, Australia, and New Zealand (ANZ), and an international reference group (INT) used a web based system to grade a selection of RetCam images of ROP acquired during the BOOST II UK trial. Rates of decisions to treat, plus disease grading, ROP stage grading, ROP zone grading, inter-observer variation within groups and intra-observer variation within groups were measured. Results Forty-two eye examinations were graded. UK ophthalmologists diagnosed treat-requiring ROP more frequently than ANZ ophthalmologists, 13.9 (3.49) compared to 9.4 (4.46) eye examinations, P=0.038. UK ophthalmologists diagnosed plus disease more frequently than ANZ ophthalmologists, 14.1 (6.23) compared to 8.5 (3.24) eye examinations, P=0.021. ANZ ophthalmologists diagnosed stage 2 ROP more frequently than UK ophthalmologists, 20.2 (5.8) compared to 12.7 (7.1) eye examinations, P=0.026. There were no other significant differences in the grading of ROP stage or zone. Inter-observer variation was higher within the UK group than within the ANZ group. Intra-observer variation was low in both groups. Conclusions We have found evidence of international variation in the diagnosis of treatment-requiring ROP. Improved standardisation of the diagnosis of treatment-requiring ROP is required. Measures might include improved training in the grading of ROP, using an international approach, and further development of ROP image analysis software.
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Montillo M, Byrd J, Hillmen P, O'Brien S, Barrientos J, Reddy N, Coutre S, Tam C, Mulligan S, Jaeger U, Barr P, Furman R, Kipps T, Thornton P, Moreno C, Pagel J, Burger J, Jones J, Dai S, Vezan R, James D, Brown J. LONG-TERM EFFICACY AND SAFETY IN THE RESONATE STUDY: IBRUTINIB IN PATIENTS WITH PREVIOUSLY TREATED CHRONIC LYMPHOCYTIC LEUKEMIA (CLL) WITH UP TO FOUR YEARS FOLLOW-UP. Hematol Oncol 2017. [DOI: 10.1002/hon.2438_98] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Dai S, Nan X, Zhao H, Song Q, Zhang C. 489 Nagashima-type palmoplantar keratoderma: Mutation analysis of the SERPINB 7 gene. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Wang JG, Guo YZ, Kong YZ, Dai S, Zhao BY. High non-esterified fatty acid concentrations promote expression and secretion of fibroblast growth factor 21 in calf hepatocytes cultured in vitro. J Anim Physiol Anim Nutr (Berl) 2017; 102:e476-e481. [PMID: 28447390 DOI: 10.1111/jpn.12699] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 01/24/2017] [Indexed: 12/30/2022]
Abstract
Negative energy balance is considered as the pathological basis of energy metabolic disorders in periparturient dairy cows. Serum non-esterified fatty acids (NEFA) are one of the most important indicators of energy balance status. Fibroblast growth factor 21 (FGF21) has been identified as a hepatokine involved in regulation of metabolic adaptations, such as promoting hepatic lipid oxidation and ketogenesis, during energy deprivation. However, the direct effects of NEFA on FGF21 expression and secretion in bovine hepatocytes are not entirely clear. The objective of this study was to investigate the effects of different NEFA concentrations on FGF21 expression and secretion in calf hepatocytes cultured in vitro. NEFA were added to the culture solution at final concentrations of 0.6, 1.2, 1.8 and 2.4 mmol/L. After 24 hr of continuous culture, FGF21 mRNA and protein expression levels in the hepatocytes were determined by real-time PCR and Western blot respectively. FGF21 secretion in the supernatant was determined by enzyme-linked immunosorbent assay (ELISA). The results showed that expression and secretion of FGF21 at 0.6 mmol/L NEFA-treated hepatocytes was higher than that of the control group (p < .05). The FGF21 expression and secretion were similar at 1.2, 1.8 and 2.4 mmol/L NEFA-treated hepatocytes and significantly higher than those observed for controls (p < .01). These data suggest that high concentrations of NEFA significantly promote FGF21 expression and secretion in bovine hepatocytes. In particular, this promotion occurs in a dose-dependent manner and may be involved in the pathological processes of energy metabolism disorders of dairy cows in the peripartum period.
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Fei Z, Foley JJ, Gannett W, Liu MK, Dai S, Ni GX, Zettl A, Fogler MM, Wiederrecht GP, Gray SK, Basov DN. Ultraconfined Plasmonic Hotspots Inside Graphene Nanobubbles. NANO LETTERS 2016; 16:7842-7848. [PMID: 27960518 DOI: 10.1021/acs.nanolett.6b04076] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We report on a nanoinfrared (IR) imaging study of ultraconfined plasmonic hotspots inside graphene nanobubbles formed in graphene/hexagonal boron nitride (hBN) heterostructures. The volume of these plasmonic hotspots is more than one-million-times smaller than what could be achieved by free-space IR photons, and their real-space distributions are controlled by the sizes and shapes of the nanobubbles. Theoretical analysis indicates that the observed plasmonic hotspots are formed due to a significant increase of the local plasmon wavelength in the nanobubble regions. Such an increase is attributed to the high sensitivity of graphene plasmons to its dielectric environment. Our work presents a novel scheme for plasmonic hotspot formation and sheds light on future applications of graphene nanobubbles for plasmon-enhanced IR spectroscopy.
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Huang J, Liu Y, Dai S, Lu P, Ba Y, Wu L, Bai Y, Zhang S, Feng J, Cheng Y, Li J, Wen L, Yuan X, Ma C, Fan Q, Wang X, Xu B. Randomized, open-label, phase III study comparing irinotecan plus S-1 with S-1 alone in patients with advanced esophageal squamous cell carcinoma after failure of prior platinum- or taxane-based chemotherapy: Results of an interim analysis. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw435.18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Jin X, Huang H, Wang L, Sun Y, Dai S. Transcriptomics and Metabolite Analysis Reveals the Molecular Mechanism of Anthocyanin Biosynthesis Branch Pathway in Different Senecio cruentus Cultivars. FRONTIERS IN PLANT SCIENCE 2016; 7:1307. [PMID: 27656188 PMCID: PMC5012328 DOI: 10.3389/fpls.2016.01307] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 08/15/2016] [Indexed: 05/23/2023]
Abstract
The cyanidin (Cy), pelargonidin (Pg), and delphinidin (Dp) pathways are the three major branching anthocyanin biosynthesis pathways that regulate flavonoid metabolic flux and are responsible for red, orange, and blue flower colors, respectively. Different species have evolved to develop multiple regulation mechanisms that form the branched pathways. In the current study, five Senecio cruentus cultivars with different colors were investigated. We found that the white and yellow cultivars do not accumulate anthocyanin and that the blue, pink, and carmine cultivars mainly accumulate Dp, Pg, and Cy in differing densities. Subsequent transcriptome analysis determined that there were 43 unigenes encoding anthocyanin biosynthesis genes in the blue cultivar. We also combined chemical and transcriptomic analyses to investigate the major metabolic pathways that are related to the observed differences in flower pigmentation in the series of S. cruentus. The results showed that mutations of the ScbHLH17 and ScCHI1/2 coding regions abolish anthocyanin formation in the white and the yellow cultivars; the competition of the ScF3'H1, ScF3'5'H, and ScDFR1/2 genes for naringenin determines the differences in branching metabolic flux of the Cy, Dp, and Pg pathways. Our findings provide new insights into the regulation of anthocyanin branching and also supplement gene resources (including ScF3'5 'H, ScF3'H, and ScDFRs) for flower color modification of ornamentals.
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Hu H, Bai X, Wen A, Shah A, Dai S, Ren Q, Wang S, He S, Wang L. Assessment of interactions between glutamine and glucose on meat quality, AMPK, and glutamine concentrations in pectoralis major meat of broilers under acute heat stress. J APPL POULTRY RES 2016. [DOI: 10.3382/japr/pfw021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Zhan L, Qin Q, Lu J, Liu J, Zhu H, Yang X, Zhang C, Xu L, Liu Z, Cai J, Ma J, Dai S, Tao G, Cheng H, Sun X. Novel poly (ADP-ribose) polymerase inhibitor, AZD2281, enhances radiosensitivity of both normoxic and hypoxic esophageal squamous cancer cells. Dis Esophagus 2016; 29:215-23. [PMID: 25604309 DOI: 10.1111/dote.12299] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Radiotherapy plays an important role in the treatment of esophageal squamous cell carcinoma (ESCC). However, the outcome of radiotherapy in ESCC remains unsatisfactory because esophageal squamous cancer cells, particularly those under hypoxic condition, exhibit radioresistance. The aim of this study was to determine whether or not AZD2281, a potent poly (ADP-ribose) polymerase (PARP) inhibitor, could enhance the radiation sensitivity of two ESCC cell lines, namely ECA109 and TE13. The radiosensitizing effect of AZD2281 was evaluated on the basis of cell death, clonogenic survival and tumor xenograft progression. AZD2281 alone was slightly toxic to ESCC cell lines. Apoptosis was increased and clonogenic survival was decreased in both cell lines when AZD2281 was combined with ionizing radiation (IR) under normoxic condition. AZD2281 enhanced IR-induced apoptosis to a more significant level under chronic hypoxic condition (0.2% O(2), 48 hour) than under normoxic condition. AZD2281 also slightly enhanced clonogenic cell death under chronic hypoxic condition compared with that under normoxic condition. This result could be associated with increased radiation-induced DNA double-strand breaks (DSB), decreased DSB repair and increased apoptosis of ESCC cells. Furthermore, homologous recombination (HR) protein Rad51 expression and focus formation were decreased in ESCC cells exposed to moderate chronic hypoxic condition (0.2% O(2), 48 hour); this result indicated that chronic hypoxic ESCC cells were HR deficient, possibly causing contextual synthetic lethality with PARP inhibitor in radiation sensitization. AZD2281 was also a radiation sensitizer in ESCC tumor xenograft models. Hence, in vitro and in vivo findings provide evidence that AZD2281 potently sensitizes ESCC cells to X-ray irradiation. The selective cell killing of HR-defective hypoxic cells contributes to radiosensitization by PARP inhibitor in ESCC cells under hypoxic condition.
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Qi S, Yang L, Wen X, Hong Y, Song X, Zhang M, Dai S. Reference Gene Selection for RT-qPCR Analysis of Flower Development in Chrysanthemum morifolium and Chrysanthemum lavandulifolium. FRONTIERS IN PLANT SCIENCE 2016; 7:287. [PMID: 27014310 PMCID: PMC4786574 DOI: 10.3389/fpls.2016.00287] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 02/22/2016] [Indexed: 05/20/2023]
Abstract
Quantitative real-time PCR (qPCR) is a popular and powerful tool used to understand the molecular mechanisms of flower development. However, the accuracy of this approach depends on the stability of reference genes. The capitulum of chrysanthemums is very special, which is consisting of ray florets and disc florets. There are obvious differences between the two types of florets in symmetry, gender, histological structure, and function. Furthermore, the ray florets have various shapes. The objective of present study was to identify the stable reference genes in Chrysanthemum morifolium and Chrysanthemum lavandulifolium during the process of flower development. In this study, nine candidate reference genes were selected and evaluated for their expression stability acrosssamples during the process of flower development, and their stability was validated by four different algorithms (Bestkeeper, NormFinder, GeNorm, and Ref-finder). SAND (SAND family protein) was found to be the most stably expressed gene in all samples or different tissues during the process of C. lavandulifolium development. Both SAND and PGK (phosphoglycerate kinase) performed most stable in Chinese large-flowered chrysanthemum cultivars, and PGK was the best in potted chrysanthemums. There were differences in best reference genes among varieties as the genetic background of them were complex. These studies provide guidance for selecting reference genes for analyzing the expression pattern of floral development genes in chrysanthemums.
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Tang M, Chen C, Li J, Xiang W, Wu H, Wu J, Dai S, Wu H, Li T, Wang G. Fabivirga thermotolerans gen. nov., sp. nov., a novel marine bacterium isolated from culture broth of a marine cyanobacterium. Int J Syst Evol Microbiol 2016; 66:1095-1099. [DOI: 10.1099/ijsem.0.000839] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Abney CW, Das S, Mayes RT, Kuo LJ, Wood J, Gill G, Piechowicz M, Lin Z, Lin W, Dai S. A report on emergent uranyl binding phenomena by an amidoxime phosphonic acid co-polymer. Phys Chem Chem Phys 2016; 18:23462-8. [DOI: 10.1039/c6cp04772f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
XAFS investigations of uranyl binding by an adsorbent polymer reveal different coordination modes than anticipated from previous small molecule studies.
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Cui X, Dini S, Dai S, Bi J, Binder BJ, Green JEF, Zhang H. A mechanistic study on tumour spheroid formation in thermosensitive hydrogels: experiments and mathematical modelling. RSC Adv 2016. [DOI: 10.1039/c6ra11699j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Thermo-reversible microgels to culture and harvest uniform-sized tumour spheroids with a narrow size-distribution.
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Fei Z, Goldflam MD, Wu JS, Dai S, Wagner M, McLeod AS, Liu MK, Post KW, Zhu S, Janssen GCAM, Fogler MM, Basov DN. Edge and Surface Plasmons in Graphene Nanoribbons. NANO LETTERS 2015; 15:8271-8276. [PMID: 26571096 DOI: 10.1021/acs.nanolett.5b03834] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report on nano-infrared (IR) imaging studies of confined plasmon modes inside patterned graphene nanoribbons (GNRs) fabricated with high-quality chemical-vapor-deposited (CVD) graphene on Al2O3 substrates. The confined geometry of these ribbons leads to distinct mode patterns and strong field enhancement, both of which evolve systematically with the ribbon width. In addition, spectroscopic nanoimaging in the mid-infrared range 850-1450 cm(-1) allowed us to evaluate the effect of the substrate phonons on the plasmon damping. Furthermore, we observed edge plasmons: peculiar one-dimensional modes propagating strictly along the edges of our patterned graphene nanostructures.
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Ladshaw AP, Das S, Liao WP, Yiacoumi S, Janke CJ, Mayes RT, Dai S, Tsouris C. Experiments and Modeling of Uranium Uptake by Amidoxime-Based Adsorbent in the Presence of Other Ions in Simulated Seawater. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b03456] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Das S, Oyola Y, Mayes RT, Janke CJ, Kuo LJ, Gill G, Wood JR, Dai S. Extracting Uranium from Seawater: Promising AI Series Adsorbents. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b03135] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Das S, Oyola Y, Mayes RT, Janke CJ, Kuo LJ, Gill G, Wood JR, Dai S. Extracting Uranium from Seawater: Promising AF Series Adsorbents. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b03136] [Citation(s) in RCA: 115] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Das S, Liao WP, Flicker Byers M, Tsouris C, Janke CJ, Mayes RT, Schneider E, Kuo LJ, Wood JR, Gill GA, Dai S. Alternative Alkaline Conditioning of Amidoxime Based Adsorbent for Uranium Extraction from Seawater. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b03210] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Shanmugasegaram S, Dai S, Waters C. INCIDENCE AND PREVALENCE OF ACUTE MYOCARDIAL INFARCTION IN CANADIAN PROVINCES AND TERRITORIES. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Shannon RM, Ravi V, Lentati LT, Lasky PD, Hobbs G, Kerr M, Manchester RN, Coles WA, Levin Y, Bailes M, Bhat NDR, Burke-Spolaor S, Dai S, Keith MJ, Osłowski S, Reardon DJ, van Straten W, Toomey L, Wang JB, Wen L, Wyithe JSB, Zhu XJ. Gravitational waves from binary supermassive black holes missing in pulsar observations. Science 2015; 349:1522-5. [DOI: 10.1126/science.aab1910] [Citation(s) in RCA: 320] [Impact Index Per Article: 35.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Das S, Tsouris C, Zhang C, Kim J, Brown S, Oyola Y, Janke CJ, Mayes RT, Kuo LJ, Wood JR, Gill GA, Dai S. Enhancing Uranium Uptake by Amidoxime Adsorbent in Seawater: An Investigation for Optimum Alkaline Conditioning Parameters. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b02735] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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