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Racial discrimination is back as a hot topic. Although studies documented that racial inequality negatively influences racial minorities, the relationship between perceived racial discrimination and aggression is unclear. Therefore, this study aims to explore the impact of perceived racial discrimination on aggression in Malaysia. A total of 136 adults responded to an online survey consisting of the Brief Perceived Ethnic Discrimination Questionnaire-Community Version (Brief PEDQ-CV) and Aggression Questionnaire 12 (AQ-12). Correlation analysis found positive relationships between subscales of perceived racial discrimination (Exclusion, Workplace Discrimination/Discrimination at school, Stigmatisation, Threat and Harassment, & Police) as well as aggression (Physical Aggression, Verbal Aggression, Anger, & Hostility). The Police subscale, however, was only associated with Physical Aggression. Gender differences were found in Physical Aggression, with males scoring higher than females. Multiple regression analyses showed that Exclusion has impact on both Anger and Hostility. The findings of this study contribute to relevant literature by showing that people become angry and hostile when they are being racially excluded. The results also highlight the importance of racial equality in individual well-beings in addition to creating awareness of racial discrimination in Malaysia. [ABSTRACT FROM AUTHOR]

We demonstrate a way to prepare single photons with a temporal envelope that resembles the time reversal of photons from the spontaneous decay process. We use the photon pairs generated from a time-ordered cascade decay: the detection of the first photon of the cascade is used as a herald for the ground-state transition resonant second photon. We show how the interaction of the heralding photon with an asymmetric Fabry-Perot cavity reverses the temporal shape of its twin photon from a decaying to a rising exponential envelope. This single photon is expected to be ideal for interacting with two-level systems.

We observe narrow band pairs of time-correlated photons of wavelengths 776 and 795 nm from nondegenerate four-wave mixing in a laser-cooled atomic ensemble of ^{87}Rb using a cascade decay scheme. Coupling the photon pairs into single mode fibers, we observe an instantaneous rate of 7700 pairs per second with silicon avalanche photodetectors, and an optical bandwidth below 30 MHz. Detection events exhibit a strong correlation in time [g((2))(τ = 0) ≈ 5800] and a high coupling efficiency indicated by a pair-to-single ratio of 23%. The violation of the Cauchy-Schwarz inequality by a factor of 8.4 × 10(6) indicates a strong nonclassical correlation between the generated fields, while a Hanbury Brown-Twiss experiment in the individual photons reveals their thermal nature. The comparison between the measured frequency bandwidth and 1/e decay time of g((2)) indicates a transform-limited spectrum of the photon pairs. The narrow bandwidth and brightness of our source makes it ideal for interacting with atomic ensembles in quantum communication protocols.

We report on a direct measurement of a phase shift on a weak coherent beam by a single 87Rb atom in a Mach-Zehnder interferometer. By strongly focusing the probe mode to the location of the atom, a maximum phase shift of about 1 degree is observed experimentally.

Bioassay-guided fractionation of a CHCl(3) extract from the leaves of Ardisia teysmanniana Scheff. (Myrsinaceae) has led to the isolation of three new alkyldibenzoquinone derivatives that showed inhibitory activity in an in vitro assay for UDP-MurNac synthesis. The structures of ardisiaquinone G, H and I were established using MS and NMR spectroscopic methods.