Particle Transportation Using Programmable Electrode Arrays

This study presents a technique to manipulate particles in microchannels using arrays of individually excitable electrodes. These electrodes were energized sequentially to form a non-uniform electric field that moved along the microchannel. The non-uniform electric field caused dielectrophoresis to make polarized particles move. This technique was demonstrated using viable yeast cells in a suspending medium with different conductivities. The viable yeast cells experienced positive dielectrophoresis and negative dielectrophoresis in medium conductivity of 21.5 μS/cm and 966 μS/cm respectively. The experimental results indicate that the cells can be transported in either condition using the proposed technique.Singapore-MIT Alliance (SMA

Generation of Dielectrophoretic Force under Uniform Electric Field

Effective dipole moment method has been widely accepted as the de facto technique in predicting the dielectrophoretic force due to the non-uniform electric field. In this method, a finite-particle is modeled as an equivalent point-dipole that would induce a same electric field under the external electric field. This approach is only valid when the particle size is significantly smaller than the characteristic length of interest. This assumption is often violated in a microfluidic device, where the thickness or width of the microchannel can be as small as the particle. It is shown in this numerical study that when the dimensions of the particle were in the same order of magnitude as the characteristic length of the device, dielectrophoretic force can be induced even in a uniform electric field. This force arises due to the disturbance of the particle and the bounding wall.Singapore-MIT Alliance (SMA

Light flavor asymmetry of nucleon sea

The light flavor antiquark distributions of the nucleon sea are calculated in the effective chiral quark model and compared with experimental results. The contributions of the flavor-symmetric sea-quark distributions and the nuclear EMC effect are taken into account to obtain the ratio of Drell-Yan cross sections $\sigma^{\mathrm{pD}}/2\sigma^{\mathrm{pp}}$, which can match well with the results measured in the FermiLab E866/NuSea experiment. The calculated results also match the measured $\bar{d}(x)-\bar{u}(x)$ from different experiments, but unmatch the behavior of $\bar{d}(x)/\bar{u}(x)$ derived indirectly from the measurable quantity $\sigma^{\mathrm{pD}}/2\sigma^{\mathrm{pp}}$ by the FermiLab E866/NuSea Collaboration at large $x$. We suggest to measure again $\bar{d}(x)/\bar{u}(x)$ at large $x$ from precision experiments with careful experimental data treatment. We also propose an alternative procedure for experimental data treatment.Comment: 10 pages, 8 figures, final version to appear in EPJ

Proton and pion structure functions in the improved valon model

Physical Review D - Particles, Fields, Gravitation and Cosmology5971-8PRVD

The use of Chinese herbal medicines and their correlates in Chinese older adults: The Singapore Chinese longitudinal aging study

10.1093/ageing/afh016Age and Ageing332135-142AANG

Patients' and Caregivers' Attitudes Towards Deprescribing in Singapore

J Gerontol A Biol Sci Med Sc

Resting am) thrombin-stimulated cytosolic calcium in platelets of patients with alcoholic withdrawal, bipolar manic disorder and chronic schizophrenia

Life Sciences56211817-1823LIFS

The NUH Memory Clinic

Singapore Medical Journal383112-115SIMJ

Drug utilization review of risperidone for outpatients in a tertiary referral hospital in Singapore

Human Psychopharmacology194259-264HUPS

Difference in platelet cytosolic calcium response to thrombin in alcoholic withdrawal and sober patients

Journal of Studies on Alcohol56121-23JSAL