www.sciencemag.org SCIENCE VOL 324 17 APRIL 2009 303 COVER Multiphoton laser scanning images showing cortical (top) and medullary (bottom) portions of a mouse inguinal lymph node. Green spheres represent dendritic cell precursors 5 hours after transfer from bone marrow; B cell follicles are shown in blue; blood vessels and T cells are in red. During development, these precursors migrate through...

BACKGROUND Divergence driven by female preference can give rise to pre-mating isolation more rapidly than post-mating isolation can evolve through the accumulation of allelic incompatibilities. Moreover pre-mating isolation may be more effective at maintaining morphological differentiation between divergent populations. In the context of Australian rainforest endemic skinks that were historical...

Measuring Chirality Upon illumination with laser light (in red), chiral silver nanoparticles in the glass cuvette emit third harmonic scattered blue), whose intensity depends on chirality, as described article number 2100235 by Ventsislav K. Valev and co-workers. The background image is a panning shot of lab, representing long sequence experiments to demonstrate new physical effect.

It has been proposed that after activation by blue light, activated melanopsin is converted back to its resting state by long wavelength red light exposure, a putative mechanism of melanopsin chromophore recovery in vivo. We tested this hypothesis by investigating whether red light attenuates the ongoing post-illumination pupil response (PIPR) induced by melanopsin-activating blue light. Pupill...

We investigated the use of a cytometer equipped with a red diode laser as a possible detector for biological warfare agents (Becton-Dickinson FACSCaliburTM equipped with a red diode laser in addition to the Argon laser). These instruments are smaller, require less power, and also have a reduced logistics burden. We decided to focus our efforts on YOYO-3, TOTO-3, and TOPRO-3, since we have worke...

Light spectrum plays a key role in the biology of symbiotic corals, with blue light resulting in higher coral growth, zooxanthellae density, chlorophyll a content and photosynthesis rates as compared to red light. However, it is still unclear whether these physiological processes are blue-enhanced or red-repressed. This study investigated the individual and combined effects of blue and red ligh...

With increasing interest in visible light communication, the laser diode (LD) provides an attractive alternative, with higher efficiency, shorter linewidth and larger bandwidth for high-speed visible light communication (VLC). Previously, more than 3 Gbps data rate was demonstrated using LED. By using LDs and spectral-efficient orthogonal frequency division multiplexing encoding scheme, signifi...