Climate-driven changes are expected to alter the hydrography of the Sub-Antarctic Zone (SAZ) and Polar Frontal Zone (PFZ) south of Australia, in which distinct regional environments are believed to be responsible for the differences in phytoplankton biomass in these regions. Here, we report how the dynamic influences of light, iron and temperature, which are responsible for the photophysiologic...

Light quality is a common environmental factor which influences the metabolism of biochemical substances in algae and leads to response algal growth development. <i>Pyropia yezoensis</i> kind economic macroalgae that naturally grows intertidal zone where light environment changes dramatically. In present study, <i>P. thalli were treated under white (control) monochromatic ligh...

This microspectrophotometric (MSP) study has confirmed that goldfish, acclimated under a certain light and temperature regimen, possess mixtures of porphyropsin and rhodopsin in their rod outer segments. Moreover, the MSP spectra from the red, green and blue cones of these acclimated goldfish also shifted to shorter wavelengths from spectra of pure 3-dehydroretinal based visual pigments. Thus, ...

Abstract Cultures of Nasturtium officinale were cultivated in vitro under illumination with different wavelengths light-emitting diode (LED) light (white LED light—WLED, blue light—B, red light—R, 70% and 30% light—RB, 50% green, 35% 15% light—RBG, yellow, light—RBY, far red, light—RBfR, UV, light—RBUV, darkness—D), white fluorescent (WF)—control conditions. The study investigated the influence...

The production of the pigments chlorophyll, xanthophyll, and carotelne in greeni plants apparently depends upon the structure of the colloid carrier, the chloroplast (30), and upon the activity of the protoplasm in which the chloroplast is immersed. The favorable physico-chemical state has been termed chloroplastinsymplex (3). Production of the pigments probably depends upon the organization of...

The triplet state of photosynthetic pigments has been widely used in the past as an internal nonde­ structive probe for the geometric and electronic structure of the pigment-protein complexes of photo­ synthetic bacteria. Especially the reaction center complex (RC) has been intensively studied by means of ESR in high field and zero field [1—7]. Less is known about antenna complexes. So far only...

Light is arguably the most important resource for plants, and an array of photosensory pigments enables plants to develop optimally in a broad range of ambient-light conditions. The red- and far-red-light-absorbing photosensory pigments or phytochromes (phy) regulate seedling deetiolation responses, photoperiodic flowering, and circadian rhythm. We have identified a long hypocotyl mutant under ...

From the first demonstration that insects are capable of discriminating colours, obtained by Frisch with bees in 1915, a vast amount of information has been accumulated in the past fifty years. The first experimental methods, which permitted a general investigation of insect response to stimulation by coloured objects or by monochromatic light ('behaviour experiments') have been gradually repla...

We have found that in addition to the 11-cis and 9-cis isomers of retinal which are known to couple with the visual pigment apoprotein opsin to form pigments, a third isomer 9,13-dicis retinal also will form a pigment. That this isomer is indeed bound to opsin has been shown unequivocally by removing the chromophore without isomerization and subsequent identification by high-speed liquid chroma...