Properties and evolution of emission in molecular aggregates of a perylene ammonium derivative in polymer matrices

Accepted 27 Jul 2015Size-dependent fluorescent properties of aggregates of a perylene ammonium derivative (PeryAm) were studied by steady-state and time-resolved spectroscopic methods. Quantitative analyses of aggregated states in aqueous solution indicated that the aggregation proceeded through dimer units of PeryAm. The fluorescence of the aggregate in the PVA film prepared from the aqueous solution continuously redshifted with an increase in the concentration of PeryAm in the mother liquor while keeping the absorption spectra in almost the same band shapes. Fluorescence anisotropy values of aggregates in the PVA film were dependent on the monitoring wavelength, and time profiles of the fluorescence at longer wavelengths showed a rapid increase just after the pulsed excitation. These results indicated efficient energy transfer to the stable sites in aggregates. Fluorescence microscopy images showed that aggregates were segregated in the PVA film and the color of the emission was dependent on the size of the aggregate. Under the steady-state irradiation, the emission color of the aggregates changed from green to yellow, which was attributable to the association of a small cluster of PeryAm with the green emission resulting in the formation of yellow-colored aggregates. On the basis of these results, we have discussed the mechanisms and dynamics of the aggregation and size-dependent emission in aggregates.ArticlePHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES. 14(10):1896-1902 (2015)journal articl

A Chain of Dark Clouds in Projection Against the Galactic Center

In the J, H, and Ks bands survey of the the Galactic Center region over an area of 2deg x 5deg, we have found many dark clouds, among which a distinguished chain of dark clouds can be identified with a quiescent CO cloud. The distances of the clouds is estimated to be 3.2-4.2 kpc, corresponding to the Norma arm by our new method to determine distance to dark clouds using the cumulative number of stars against J-Ks colors. Adopting these estimated distances, the size is about 70 pc in length and the total mass of the cloud is 6x10^4 M_solar. Three compact HII regions harbor in the cloud, indicating that star forming activities are going on at the cores of the quiescent CO cloud on the spiral arm.Comment: 13 pages, 7 figures, accepted for publication in PAS

Width-induced metal–insulator transition in SrVO3 lateral nanowires spontaneously formed on the ultrathin film

We investigated lateral nanowires at the topmost layer of SrVO3 (001) ultrathin films using in situ low-temperature scanning tunneling microscopy and spectroscopy. The nanowires were spontaneously formed in the topmost layer of SrVO3 with a (√2 × √2)-R45° reconstruction on the terrace of a (√5 × √5)-R26.6° reconstruction. The electronic states of nanowires were significantly influenced by the nanowire width. With reducing the nanowire width from 5.5 nm to 1.7 nm, the zero-bias conductance of nanowires steeply decreased toward zero, exhibiting a metal–insulator transition possibly driven by dimensional crossover, previously observed in thickness-reduced SrVO3 ultrathin films

Two distinct surface terminations of SrVO3 (001) ultrathin films as an influential factor on metallicity

Pulsed laser deposition-grown SrVO3 (001) ultrathin films on SrTiO3 (001) substrates were investigated by in situ low-temperature scanning tunneling microscopy and spectroscopy. SrVO3 (001) ultrathin films showed two distinct surface terminations. One termination was a (√2 ×√2)-R45° reconstruction as was previously observed for SrVO3 (001) thick films, while the other was a (√5 ×√5)-R26.6° reconstruction. Scanning tunneling spectroscopy revealed that the (√2 ×√2)-R45° surface shows a metallic electronic structure, whereas the (√5×√5)-R26.6° surface exhibits a significantly reduced density of states at the Fermi level. These results suggest that the surface reconstruction may be an important factor to influence metallicity in epitaxial ultrathin films of transition metal oxides

Single Molecular Adsorption of Terbium(III) Bis-phthalocyaninato (TbPc2) Governed by Two Surface Reconstructions of Perovskite Type SrVO3 Epitaxial Ultrathin Film

Using low temperature scanning tunneling microscopy (STM), we observed a single molecule magnet, Tb3+ double decker molecule TbPc2 (Pc = phthalocyaninato), adsorbed on a perovskite type transition metal oxide SrVO3 ultrathin film. TbPc2 molecules adsorbed intact and flat on two surface reconstructions of SrVO3, (2–√×2–√)-R45° and (5–√×5–√)-R26.6°, with different configurations. High resolution STM images revealed that the adsorption configurations were governed by the adatom structure of each surface reconstruction according to the proposed adsorption configurations

イリョウ カソ チイキ デノ エンカク シンリョウ シエン システム オ モチイタ ノウコウソク キュウセイキ イリョウ

Introduction : The validity of intravenous rt-PA therapy for acute ischemic stroke patients within ４．５ hours after onset is reported, but the rate of the delivery of rt-PA therapy is assumed lower due to its lack of stroke specialists and its geographic location in depopulated areas. In February ２０１３, we developed the telemedicine system in our medically under-served area as a potential solution of medical disparities. Objects and Methods : After the introduction for １６ months, ９５ acute ischemic stroke patients were transferred to our hospital, seven （７．３７％） of which were subjected to the “drip and ship” method of rt-PA infusion using a telemedicine system for emergency medicine （k-support）. We examined the time course after onset and the treatment outcome of these seven cases. Results : Seven cases had rt-PA infusion started in the depopulated area. In five cases, recanalization of occluded vessels were demonstrated resulting in improved clinical symptoms. Conclusion : It was able to give a standard therapy using rt-PA infusion for acute ischemic stroke and the quality of the cerebral infarction medical treatment was improved by building the telemedicine system in the depopulated area

Charge order with unusual star-of-David lattice in monolayer NbTe2

Interplay between fermiology and electron correlation is crucial for realizing exotic quantum phases. Transition-metal dichalcogenide (TMD) 1T-TaS2 has sparked a tremendous attention owing to its unique Mott-insulating phase coexisting with the charge-density wave (CDW). However, how the fermiology and electron correlation are associated with such properties has yet to be claried. Here we demonstrate that monolayer 1T-NbTe2 is a new class of two-dimensional TMD which has the star-of-David lattice similarly to bulk TaS2 and isostructural monolayer NbSe2, but exhibits a metallic ground state with an unusual lattice periodicity root19xroot19 characterized by the sparsely occupied star-of-David lattice. By using angle-resolved photoemission and scanning-tunneling spectroscopies in combination with first-principles band-structure calculations, we found that the hidden Fermi-surface nesting and associated CDW formation are a primary cause to realize this unique correlated metallic state with no signature of Mott gap. The present result points to a vital role of underlying fermiology to characterize the Mott phase of TMDs.Comment: To be published in Physical Review

トクシマケン ナンブ ノ キュウキュウ イリョウ ノ ゲンジョウ ト アラタナ トリクミ : ノウシンケイ ゲカ ノ タチバ カラ

A regular neurosurgeon was absent in the southern part II health demographic division of medical services where Kaifu-gun of South Tokushima was located after 2008 and was the present conditions that stroke treatment could not perform enough in comparison with prefecture central part. Furthermore, medical care collapse progressed with the obstetrics and gynecology department and pediatrics closedown at one sweep from the same period and, at the prefectural Kaifu Hospital which was this local nucleus hospital, became hard to maintain the emergency care, and increase of closedown of the emergency outpatient department on Saturday and the emergency transportation to the prefecture central part became remarkable, and it was with a big social problem for Tokushima. A medical difference might occur about stroke medical care in central part and the southern part in Tokushima. We performed the epidemiology survey by stroke patient in the southern II demographic division of medical services （popular name “Kaifu project”） as a President of University of Tokushima discretion project for this fact-finding individually in the University of Tokushima neurosurgery classroom. In addition, I worked on the enlightenment for inhabitants in Kaifu-gun. “Local neurosurgical medical treatment part” was established as a college course financially maintained by private donations of Tokushima University Hospital from November 1，2011． Kaifu Hospital neurosurgery medical treatment was enabled daylong, and emergency correspondence came to be in this way possible. The Kaifu Hospital devises the maintenance policy about Tokushima, local inhabitants, a medical association, a local government and the figure which there should be of “the new Kaifu Hospital” for a tsunami now in the plan of the full-scale reconstruction move to the hill in 2015

A Systems Genetics Approach Provides a Bridge from Discovered Genetic Variants to Biological Pathways in Rheumatoid Arthritis

Genome-wide association studies (GWAS) have yielded novel genetic loci underlying common diseases. We propose a systems genetics approach to utilize these discoveries for better understanding of the genetic architecture of rheumatoid arthritis (RA). Current evidence of genetic associations with RA was sought through PubMed and the NHGRI GWAS catalog. The associations of 15 single nucleotide polymorphisms and HLA-DRB1 alleles were confirmed in 1,287 cases and 1,500 controls of Japanese subjects. Among these, HLA-DRB1 alleles and eight SNPs showed significant associations and all but one of the variants had the same direction of effect as identified in the previous studies, indicating that the genetic risk factors underlying RA are shared across populations. By receiver operating characteristic curve analysis, the area under the curve (AUC) for the genetic risk score based on the selected variants was 68.4%. For seropositive RA patients only, the AUC improved to 70.9%, indicating good but suboptimal predictive ability. A simulation study shows that more than 200 additional loci with similar effect size as recent GWAS findings or 20 rare variants with intermediate effects are needed to achieve AUC = 80.0%. We performed the random walk with restart (RWR) algorithm to prioritize genes for future mapping studies. The performance of the algorithm was confirmed by leave-one-out cross-validation. The RWR algorithm pointed to ZAP70 in the first rank, in which mutation causes RA-like autoimmune arthritis in mice. By applying the hierarchical clustering method to a subnetwork comprising RA-associated genes and top-ranked genes by the RWR, we found three functional modules relevant to RA etiology: “leukocyte activation and differentiation”, “pattern-recognition receptor signaling pathway”, and “chemokines and their receptors”