The relationship between light-induced absorbance changes and photophosphorylation has been studied in extracts of the photosynthetic bacterium Rhodosfiirillum rubrum purified by partition in dextran-methyl cellulose mixtures. In these preparations infrared light induces absorbance changes in the visible region of the spectrum which are modified by the addition of reductants required for photop...

We compute the tunneling probability from the symmetric phase to the true vacuum, in the first order electroweak phase transition of the MSSM, and the corresponding Higgs profiles along the bubble wall. We use the resummed two-loop temperature-dependent effective potential, and pay particular attention to the light stop scenario, where the phase transition can be sufficiently strongly first ord...

A transmission-type variable optical attenuator (VOA) based on a polymer-stabilized dual-frequency liquid crystal (PSDFLC) is demonstrated at gamma = 1.55 microm. The VOA is highly transparent in the voltage-off state but scatters light in the voltage-on state. By using a birefringent beam displacer incorporated with half-wave plates, we can obtain a VOA that is polarization independent and tha...

Convenience and safeguarding our home appliances have become an important issue when dealing with an advancement and growth of an economy. This research focuses on the design and construction of a Dual Sensor heat-monitoring system. The circuit works by monitoring temperature from an external input and comparing the temperature level with that of a preset temperature value. The power output of ...

Motility of the desmid Cosmarium cucumis depends on light: switching the light on induces a large fraction of previously immotile cells to start moving, and switching it off causes many motile cells to stop. Turning light on or off causes light-induced electrical potential changes which can be measured with internal microelectrodes. The electrical gradient within the cell is not correlated with...

At low light intensities (less than 50 /anol m 2 s ') illumination evokes transient depolarization of membrane potential in mesophyll cells of the leaf-trap of Dionaea muscipula Ellis. Darkening causes hyperpolarization approximately symmetric to the response to illumination. The amplitude as well as the rate of potential changes depend on light intensity. After exceeding a definite threshold (...

the experiment was carried out to study the impact of chilling and night break on the flowering of ornamental plants in their off-season period. larsenianthus careyanus (benth.) w.j. kress & mood is a wild potential ornamental ginger naturally growing in the evergreen forest of north eastern states of india was selected for the current study. the rhizomes were collected and stored at 15oc f...

The application of Fe–TiO2 photocatalysis using sol–gel method by hot–dipping technique was investigated. Then, the influences of fabrication parameters, molar ratios of Fe to TiO2, the sol temperature, poly ethylene glycol (PEG) content and the number of dipping cycles on the photocatalytic activity in visible light region were mainly studied. The experimental results revealed the sample with ...

Introduction.-Diurnal rhythms which persist under constant conditions have been found in a variety of plants and animals (see Biinning;l Pittendrigh2). Most of the evidence points to the conclusion that diurnal rhythmicity is endogenous and results from oscillations of physiological processes of one sort or another. An unusual feature of many rhythms, however, is their temperature independence....