Whereas humans have three types of cone photoreceptor, birds have four types of single cones and, unlike humans, are sensitive to ultraviolet light (UV, 320-400 nm). Most birds are thought to have either a violet-sensitive single cone that has some sensitivity to UV wavelengths (for example, many non-passerine species) or a single cone that has maximum sensitivity to UV (for example, oscine pas...

The phenomenon of 'weathering' of polymeric materials is usually caused by a complex series of chemical reactions initiated by the absorption of ultra-violet light which ultimately result in the deterioration of the physical properties of the polymer. One of the most likely initiating sites for ultraviolet absorption in polymers is the ketone carbonyl group which is often introduced into the po...

The Armand pine bark weevil, Pissodes punctatus Langor et Zhang (Coleoptera: Curculionidae) is a destructive bark weevil on the Armand pine, Pinus armandii Franch (Pinales: Pinaceae), an important timbering tree in southern China. This study examined the phototactic behavior ïéP. punctatus through observation of behavioral characteristics, response to nine monochromatic lights (ranging from 340...

By M. H. F. WILKINS, M.A., PH.D. AND S. DE CARVALHO, M.D. H EME COMPOUNDS have relatively sharp absorption bands ins the visible spectrum w’hich have beers much used to identify heme enzymes ins tissue sections, e.g. the classical work of Keilins.tm These bands are, however, not sufficiently strong for consvensienst estimations of the small amounts of heme in a single cell. The Soret band, at t...

This article describes the ber optic based calibration system installed at the High Resolution Fly s Eye HiRes astro particle physics observatory The HiRes detec tors measure ultra violet scintillation light from distant extensive air showers This automated calibration system delivers light from a frequency tripled nm YAG laser to the photo multiplier tubes of the HiRes II detectors c El sevier...

The inactivation of foot-and-mouth disease virus was studied by means of the interaction of neutral red, Toluidine Blue, and methylene blue with visible light. The virus, Type A, strain 1, CANEFA of Argentine origin, was grown in tissue culture and tested in the crude and clarified state. Virus and dye were mixed and incubated together at 4 C for 45 min in the dark, or were mixed and immediatel...

The crystalline two-dimensional thiostannate Sn3S7(trenH)2 [tren = tris(2-aminoethyl)amine] consists of negatively charged (Sn3S72-)n polymeric sheets with trenH+ molecular species embedded in-between. The semiconducting compound is a violet light absorber with a band gap of 3.0 eV. In this study the compound was synthesized and functionalized by introducing the cationic dyes Methylene Blue (MB...

BACKGROUND To evaluate functional visual parameters using photocromic and selective blue-violet light filtering spectacle lenses in patients affected by central or peripheral scotoma due to retinal diseases. Sixty patients were enrolled in this study: 30 patients affected by central scotoma, group 1, and 30 affected by peripheral scotoma, group 2. Black on White Best Corrected Visual Acuity (BW...