Red light, which produces the physiologically active form of phytochrome (Pfr), inhibited epicotyl elongation in intact dark-grown Alaska pea seedlings. This red light response was detectable 3 hours after the light treatment and became pronounced after 5 hours. The growth inhibition was completely reversed by far red light applied immediately after the red or by pretreatment of the seedlings w...

OEP system is an optoelectronic device able to track the three-dimensional co-ordinates of a number of reflecting markers placed non-invasively on the skin of the subject [1-4]. A varia‐ ble number of markers (89 in the model used for respiratory acquisition in seated position) is placed on the thoraco-abdominal surface; each marker is a half plastic sphere coated with a reflective paper. Two T...

Light-field cameras have now become available in both consumer and industrial applications, and recent papers have demonstrated practical algorithms for depth recovery from a passive single-shot capture. However, current lightfield depth estimation methods are designed for Lambertian objects and fail or degrade for glossy or specular surfaces. Because light-field cameras have an array of micro-...

Light field cameras record light intensity and angle of light incidence. This extra data presents a bevy of new possibilities for robotics; however, the usefulness of light field cameras may be hampered by motion blur when used on moving platforms. Traditional deconvolution de-blurring methods use a single point spread function and perform poorly in the presence of parallax. We derive a 3D poin...

Circadian gating of light signaling limits the timing of maximum responsiveness to light to specific times of day. The fhy3 (for far-red elongated hypocotyl3) mutant of Arabidopsis thaliana is involved in independently gating signaling from a group of photoreceptors to an individual response. fhy3 shows an enhanced response to red light during seedling deetiolation. Analysis of two independent ...

My approach is to undertake a series of well replicated experiments on a broad range of zooplanktonic taxa, including copepods, larval fish, larval euphausiids, and ciliates. Our experimental apparatus consists of a series of six columnar tanks equipped with infra-red video cameras that continuously scan the full vertical range (210 cm) of each tank and thereby determine the vertical distributi...

Time-reversed ultrasonically encoded optical focusing measures the wavefront of ultrasonically tagged light, and then phase conjugates the tagged light back to the ultrasonic focus, thus focusing light deep inside the scattering media. In previous works, the speed of wavefront measurement was limited by the low frame rates of conventional cameras. In addition, these cameras used most of their b...

Rapid effects of light on wheat seedling extension growth were monitored by sensitive transducer techniques. Seedlings grown in complete darkness responded to light by a marked deceleration of extension growth after a mean latent period of 10.4 minutes. Pulses (5 minutes) of red (660 nanometers), green (530 nanometers), and far-red (730 nanometers) light caused marked extension rate depression,...