bluuebunny/crossref_metadata_2025 huggingface dataset:
LUMINESCENT TITANIA MACROPOROUS MATERIALS DOPED WITH Eu(DBM)3⋅H2O COMPLEX
Authors: FAN WEIQIANG , ZHANG JIAQING , ZHANG GEHONG , BAI HONGYE , SHI WEIDONG , YAN YONGSHENG
Published: August 2013

Visible luminescent hybrid titania macroporous materials doped with Eu ( DBM )3⋅ H 2 O complex ( Eu ( DBM )3⋅ H 2 O / TiO 2- M , M = macroporous, DBM = dibenzoylmethanate) were synthesized with poly(methyl methacrylate) nanospheres (PMMAs) as templates. The obtained Eu ( DBM )3⋅ H 2 O / TiO 2- M exhibit close-packed spherical porous structure and characteristic red emission of the Eu 3+ ion. Moreover, diffuse reflectance (DR) and photoluminescence (PL) spectra suggest that the Eu ( DBM )3⋅ H 2 O complex were successfully doped into the macroporous titania matrix. The FT-IR, luminescent lifetimes, N 2 adsorption-desorption isotherm, and emission quantum efficiency were further investigated.
MOLTEN SALT SYNTHESIS OF YF3:Yb3+/Ln3+(Ln = Er3+, Tm3+) MICROSHEETS WITH MULTICOLOR UPCONVERSION LUMINESCENCE
Authors: DING MINGYE , LU CHUNHUA , CAO LINHAI , NI YARU , XU ZHONGZI
Published: August 2013

In this paper, highly crystalline YF 3: Yb 3+/ Ln 3+( Ln = Er 3+, Tm 3+) microsheets were successfully synthesized by a surfactant-free molten salt method for the first time. The results indicated that the as-obtained samples belonged to orthorhombic system and exhibited microsheets morphology with side lengths of 30 to 80 μm and wall thickness from 1 to 1.5 μm. By changing the dopant's species ( Ln 3+), multicolor (yellow and blue) upconversion emission can be observed in YF 3: Yb 3+/ Ln 3+ microsheets under 980 nm laser diode (LD) excitation. The upconversion mechanisms in co-doping YF 3 samples were analyzed in detail based on the emission spectra. Importantly, this approach not only proposes a new alternative in synthesizing such materials, but also opens the possibility to meet the increasing commercial demand.
GRAPHENE/MULTI-WALLED CARBON NANOTUBE COMPOSITE AS AN EFFECTIVE SUPPORTS TO ENHANCE THE PHOTOCATALYTIC PROPERTY OF Cu-DOPED ZnO NANOPARTICLES
Authors: CHEN C. S. , XIE X. D. , ZHAO G. J. , ZENG B. , NING X. T. , CAO S. Y. , XIAO Y. , MEI Y. P. , MENG X. M. , HUANG M. X.
Published: August 2013

In this paper, graphene/multi-walled carbon nanotubes (GM) hybrid nanostructure was synthesized by modifying GR using salicylamide. Cu -doped ZnO nanoparticles were successfully decorated on GR/MWNTs hybrids (GM). Their photocatalytic performance for the degradation of methyl orange (MO) was investigated and the results showed that the synthetic GM/ Cu -doped ZnO hybrids exhibited better photocatalytic ability than MWNTs/ Cu -doped ZnO and GR/ Cu -doped ZnO hybrids, in which the degraded rate for 20 mg/L MO solution reaches about 100% in 45 min.
EQUILIBRIUM STATES OF SOFT MAGNETIC HEMISPHERICAL SHELL
Authors: SHEKA DENIS D. , KRAVCHUK VOLODYMYR P. , SLOIKA MYKOLA I. , GAIDIDEI YURI
Published: August 2013

The ground state of hemispherical permalloy magnetic shell is studied. There exist two magnetic phases: the onion state and the vortex one. The phase diagram is systematically analyzed in a wide range of geometrical parameters. Possible transitions between different phases are analyzed using the combination of analytical calculations and micromagnetic simulations.
Spectral reconstruction of phase response curves reveals the synchronization properties of mouse globus pallidus neurons
Authors: Goldberg Joshua A. , Atherton Jeremy F. , Surmeier D. James
Published: August 2013

The propensity of a neuron to synchronize is captured by its infinitesimal phase response curve (iPRC). Determining whether an iPRC is biphasic, meaning that small depolarizing perturbations can actually delay the next spike, if delivered at appropriate phases, is a daunting experimental task because negative lobes in the iPRC (unlike positive ones) tend to be small and may be occluded by the normal discharge variability of a neuron. To circumvent this problem, iPRCs are commonly derived from numerical models of neurons. Here, we propose a novel and natural method to estimate the iPRC by direct estimation of its spectral modes. First, we show analytically that the spectral modes of the iPRC of an arbitrary oscillator are readily measured by applying weak harmonic perturbations. Next, applying this methodology to biophysical neuronal models, we show that a low-dimensional spectral reconstruction is sufficient to capture the structure of the iPRC. This structure was preserved reasonably well even with added physiological scale jitter in the neuronal models. To validate the methodology empirically, we applied it first to a low-noise electronic oscillator with a known design and then to cortical pyramidal neurons, recorded in whole cell configuration, that are known to possess a monophasic iPRC. Finally, using the methodology in conjunction with perforated-patch recordings from pallidal neurons, we show, in contrast to recent modeling studies, that these neurons have biphasic somatic iPRCs. Biphasic iPRCs would cause lateral somatically targeted pallidal inhibition to desynchronize pallidal neurons, providing a plausible explanation for their lack of synchrony in vivo.
Weaker feedforward inhibition accounts for less pronounced thalamocortical response transformation in mouse vs. rat barrels
Authors: Kwegyir-Afful E. E. , Kyriazi H. T. , Simons D. J.
Published: August 2013

Feedforward inhibition is a common motif of thalamocortical circuits. Strong engagement of inhibitory neurons by thalamic inputs enhances response differentials between preferred and nonpreferred stimuli. In rat whisker-barrel cortex, robustly driven inhibitory barrel neurons establish a brief epoch during which synchronous or near-synchronous thalamic firing produces larger responses to preferred stimuli, such as high-velocity deflections of the principal whisker in a preferred direction. Present experiments in mice show that barrel neuron responses to preferred vs. nonpreferred stimuli differ less than in rats. In addition, fast-spike units, thought to be inhibitory barrel neurons, fire less robustly to whisker stimuli in mice than in rats. Analyses of real and simulated data indicate that mouse barrel circuitry integrates thalamic inputs over a broad temporal window, and that, as a consequence, responses of barrel neurons are largely similar to those of thalamic neurons. Results are consistent with weaker feedforward inhibition in mouse barrels. Differences in thalamocortical circuitry between mice and rats may reflect mechanical properties of the whiskers themselves.
Neuronal responses to target onset in oculomotor and somatomotor parietal circuits differ markedly in a choice task
Authors: Kubanek J. , Wang C. , Snyder L. H.
Published: August 2013

We often look at and sometimes reach for visible targets. Looking at a target is fast and relatively easy. By comparison, reaching for an object is slower and is associated with a larger cost. We hypothesized that, as a result of these differences, abrupt visual onsets may drive the circuits involved in saccade planning more directly and with less intermediate regulation than the circuits involved in reach planning. To test this hypothesis, we recorded discharge activity of neurons in the parietal oculomotor system (area LIP) and in the parietal somatomotor system (area PRR) while monkeys performed a visually guided movement task and a choice task. We found that in the visually guided movement task LIP neurons show a prominent transient response to target onset. PRR neurons also show a transient response, although this response is reduced in amplitude, is delayed, and has a slower rise time compared with LIP. A more striking difference is observed in the choice task. The transient response of PRR neurons is almost completely abolished and replaced with a slow buildup of activity, while the LIP response is merely delayed and reduced in amplitude. Our findings suggest that the oculomotor system is more closely and obligatorily coupled to the visual system, whereas the somatomotor system operates in a more discriminating manner.
The Effect of Hydroxybenzoate Lithium Complexes in Inducing Apoptosis in HT-1080 Human Fibrosarcoma Cells
Authors: Mahdi Jassem G. , Mahdi Eamon J. , Al-Hazzaa Amal , Pepper Chris J.
Published: August 2013

There has been a growing interest in the beneficial effects of simple phenolic acids and their ability to exhibit various biological activities. The aim of this study was to assess in vitro biological activities of 2-, 3-, and 4-hydroxybenzoate lithium (HBLi) complexes on HT-1080 human fibrosarcoma cells by methods of using a metabolic activity assay, immunochemical and morphological techniques. Results showed that HBLi complexes exert their cytotoxic activities in a concentration- and chemical structure-dependent manner in the following order: 4-HBLi > 3-HBLi > 2-HBLi. Flow cytometry displayed evidence of apoptosis induced by 3-HBLi (21.8%) and 4-HBLi (33.2%). These results were verified by SEM, which revealed the formation of apoptotic bodies. In addition, these 3-HBLi and 4-HBLi caused an increase in HT-1080 cell cycle arrest in G0/G1 phase when compared to the controls (25% and 30.6%, resp.) when cells were treated with 6 mM for 24 hours. Immunochemical studies related to the molecular mechanism of apoptosis indicated that HBLi complexes downregulated the expression of Bcl-2 and upregulated Bax, p53, and caspases-3 in a concentration-dependent manner. HBLi complexes lowered Bcl-2/Bax ratios and induced the expression of p53 and caspase-3. These results suggest that HBLi complexes may exert their apoptotic effects through mitochondrial-mediated, caspase-dependent, apoptotic mechanisms.