579 research outputs found
The Therapeutic Effect of Cytokine-Induced Killer Cells on Pancreatic Cancer Enhanced by Dendritic Cells Pulsed with K-Ras Mutant Peptide
Objective. This study is to investigate the role of the CIKs cocultured with K-ras-DCs in killing of pancreatic cancer cell lines, PANC-1 (K-ras+) and SW1990 (K-ras−). Methods. CIKs induced by IFN-γ, IL-2, and anti-CD3 monoantibody, K-ras-DCCIKs obtained by cocultivation of k-ras-DCs and CIKs. Surface markers examined by FACS. IFN-γ IL-12 ,CCL19 and CCL22 detected by ELISA. Proliferation of various CIKs tested via 3H-TdR. Killing activities of k-ras-DCCIKs and CTLs examined with 125IUdR. Results. CD3+CD56+ and CD3+CD8+ were highly expressed by K-ras-DCCIKs. In its supernatant, IFN-γ, IL-12, CCL19 and CCL22 were significantly higher than those in DCCIK and CIK. The killing rate of K-ras-DCCIK was greater than those of CIK and CTL. CTL induced by K-ras-DCs only inhibited the PANC-1 cells. Conclusions. The k-ras-DC can enhance CIK's proliferation and increase the killing effect on pancreatic cancer cell. The CTLs induced by K-ras-DC can only inhibit PANC-1 cells. In this study, K-ras-DCCIKs also show the specific inhibition to PANC-1 cells, their tumor suppression is almost same with the CTLs, their total tumor inhibitory efficiency is higher than that of the CTLs
Generalized radio resource management for overlapping MBS zones
Multicast and broadcast service (MBS) is a point-to-multipoint service where data packets are transmitted simultaneously from a single source to multiple destinations. In MBS, some base stations (BSs) may form an MBS zone and transmit identical MBS contents simultaneously using the same modulation and coding scheme. Hence, the network has to coordinate the transmission of BSs such that BSs belonging to multiple MBS zones may utilize non-conflict resources to transmit different MBS contents. This paper extends the work in [10] for accommodating MBS zones with different service presence probabilities and various bandwidth requirements. A continuous allocation algorithm and a non-continuous allocation algorithm are presented to allocate resource units for overlapping MBS zones. Simulations were conducted to verify the effectiveness of the proposed algorithms
Experimental Trapped-ion Quantum Simulation of the Kibble-Zurek dynamics in momentum space
The Kibble-Zurek mechanism is the paradigm to account for the nonadiabatic
dynamics of a system across a continuous phase transition. Its study in the
quantum regime is hindered by the requisite of ground state cooling. We report
the experimental quantum simulation of critical dynamics in the
transverse-field Ising model by a set of Landau-Zener crossings in
pseudo-momentum space, that can be probed with high accuracy using a single
trapped ion. We test the Kibble-Zurek mechanism in the quantum regime in the
momentum space and find the measured scaling of excitations is in accordance
with the theoretical prediction.Comment: 10 pages, 3 figures Published in Scientific Reports,
http://www.nature.com/articles/srep3338
Four new isoflavanones from Tadehagi triquetrum
Four new isoflavanones with isoprenoid units, named triquetrumones E-H (1–4), were isolated from the whole plants of Tadehagi triquetrum. The structures were elucidated on the basis of spectroscopic analyses, including application of MS, UV, IR, 1D and 2D NMR spectroscopic techniques. [Image: see text] ELECTRONIC SUPPLEMENTARY MATERIAL: Supplementary material is available for this article at 10.1007/s13659-011-0033-5 and is accessible for authorized users
Cold hybrid electrical-optical ion trap
Advances in research such as quantum information and quantum chemistry
require subtle methods for trapping particles (including ions, neutral atoms,
molecules, etc.). Here we propose a hybrid ion trapping method by combining a
Paul trap with optical tweezers. The trap combines the advances of the
deep-potential feature for the Paul trap and the micromotion-free feature for
the optical dipole trap. By modulating the optical-dipole trap synchronously
with the radio frequency voltage of the Paul trap, the alternating electrical
force in the trap center is fully counteracted, and the micromotion temperature
of a cold trapped ion can reach the order of nK while the trap depth is beyond
300K. These features will enable cold collisions between an ion and an atom in
the -wave regime and stably trap the produced molecular ion in the cold
hybrid system. This will provide a unique platform for probing the interactions
between the ions and the surrounding neutral particles and enable the
investigation of new reaction pathways and reaction products in the cold
regime
Quantumness and quantum to classical transition in the generalized Rabi model
The quantum to classical transition (QCT) is one of the central mysteries in
quantum physics. This process is generally interpreted as state collapse from
measurement or decoherence from interacting with the environment. Here we
define the quantumness of a Hamiltonian by the free energy difference between
its quantum and classical descriptions, which vanishes during QCT. We apply
this criterion to the many-body Rabi model and study its scaling law across the
phase transition, finding that not only the temperature and Planck constant,
but also all the model parameters are important for this transition. We show
that the Jaynes-Cummings and anti Jaynes-Cummings models exhibit greater
quantumness than the Rabi model. Moreover, we show that the rotating wave and
anti-rotating wave terms in this model have opposite quantumness in QCT. We
demonstrate that the quantumness may be enhanced or suppressed at the critical
point. Finally, we estimate the quantumness of the Rabi model in current
trapped ion experiments. The quantumness provides an important tool to
characterize the QCT in a vast number of many-body models.Comment: 6 pages, 5 figure
Magnon-bandgap controllable artificial domain wall waveguide
In this paper, a magnon-bandgap controllable artificial domain wall waveguide
is proposed by means of micromagnetic simulation. By the investigation of the
propagation behavior and dispersion relationship of spin waves in artificial
domain wall waveguides, it is found that the nonreciprocal propagation of spin
waves in the artificial domain walls are mainly affected by the local effective
exchange field, and the magnon bandgap can be controlled by changing the
maximum value of the effective exchange field. In addition, it is observed that
the artificial domain wall waveguides are structurally more stable than the
natural domain wall waveguides under the same spin wave injection conditions,
and the magnon bandgap of the artificial domain wall waveguides can be adjusted
by its width and magnetic anisotropy parameters. The bandgap controllable
artificial domain wall scheme is beneficial to the miniaturization and
integration of magnon devices and can be applied to future magnonic technology
as a novel frequency filter
预处理对多孔硅形成过程的影响
【Abstract】In this work, effect of precondition on porous silicon formation was investigated by performing electrochemical polarization measurements. The surface morphologies and optical properties of the samples were also studied by scanning electron microscopy (SEM) and Raman
spectrometer. It was demonstrated that precondition enhanced the chemical/electrochemical reactions occurred at Si/solution interface and the growth of porous silicon, which ultimately resulted in a red shift in photoluminescence. However, the thickness of porous silicon decreased with the increase of precondition time. More broad bands were observed with prolonged precondition.【中文摘要】本工作初步探讨了开路电位下对硅片进行预处理时多孔硅的形成过程 .电化学极化实验、扫描电镜和拉曼谱学的研究表明 ,预处理可以加速硅 /溶液界面上的化学或电化学反应 ,从而加快多孔硅的生长过程 ,最终导致光致发光的光谱红移 .多孔硅的厚度随预处理时间的增长而减
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