light stimulus

Listing 1 - 10 from 20 for light stimulus

Botany online: Growth Movements - Phototropism
... Growth Movements - Phototropism Phototropism Phototropism is a growth movement induced by a light stimulus. Growth towards a source of light is called positive phototropism, that away from the source is termed negative ... light, is the measure of the stimulus strength. It is thus of no importance whether a light stimulus of low intensity is applied for a longer period of time or whether a stimulus ...
www.biologie.uni-hamburg.de

Plant Pathology Glossary
... pigment found in chloroplasts of plant cells and algae. Chlorophyll is the receptor of light energy in photosynthesis. Chlorophyll is also found in photosynthetic bacteria. Chloroplast a disk-shaped ... in the tissues of the plant, whereas phytoalexins are only produced in response to a stimulus such as a pathogenic invasion. The distinction between phytoalexins and phytoanticipins is not always ...
bugs.bio.usyd.edu.au

Plant Pathology: Disease Management: Cultural Management Practices
... prevailing wind. The use of shade cloths can help to control fungi that need UV light in order to sporulate. Tillage practices have indirect effects on the spread of plant pathogens ... , since some combinations can actually make disease worse by providing an alternate host or a stimulus that encourages germination of inoculum on the neighbouring species. Top MULCHING AND SOIL AMENDMENTS Mulches ...
bugs.bio.usyd.edu.au More from this site

PMB - Plant & Microbial Biology Department, UC Berkeley
... Research Director, PGEC quail@nature.berkeley.edu We research molecular mechanisms by which light regulates gene expression in plants, focusing on the phytochromes family of photoreceptors. The ... of the light signal, triggers changes in transcription detectable within 5 minutes of stimulus. We recently developed a novel light-switchable gene promoter system potentially usable in any light-accessible ...
plantbio.berkeley.edu

Carnivorous Plants
... fold up at night.] These plant movements in response to a stimulus (called nastic movements) are associated with loss of tugor pressure in ... , appear to be involved in the rapid spread of the stimulus in sensitive plants. At the bases of the leaflets are jointlike ... (pinnae) with all the leaflets (pinnules) fully extended for maximum light absorption. In the right photo the leaflets have folded up ...
waynesword.palomar.edu

Spectroradiometer: Apogee Instruments Inc.
... color of reflected light. Simultaneous window (with live spectra) displays 1976 CIE LAB diagram for L*, a*, b*. Display CIELAB color values with chroma, hue, x, y, and tri-stimulus and Delta ... the spectral output and measure the intensity of various light sources. This figure shows a spectral and relative intensity comparison of multiple light sources. CLICK ON IMAGES FOR LARGER VIEWS RELATED ...
www.apogee-inst.com

Botany online: Intracellular Movements - Cytosceletons
... amoeboid and flagellar movements. Many movements of whole cells are answers to an extern stimulus like light, warmth, touch, etc. Directed intracellular movements of particles within the plasma seem ... this context becomes the question how the eliciting signal is recognized (for example in light induced movements) and the subsequent transformation into a movement interesting. The recognition will ...
www.biologie.uni-hamburg.de

Katherine Esau
... of the disease-induced tissue degeneration. It was this latter relation that provided the primary stimulus for her becoming so greatly involved in research on the phloem tissue. Her phloem research ... the adaxial side, but here two to three subepidermal layers of cells are collenchymatously thickened." Light began to dawn for us at this point. But Katherine went a bit further and ...
www.botany.org

Bribie Island Orchid Society - Orchid Information and Photographs
... following a burn. About sixteen species of Australian terrestrial orchids are dependant on the stimulus provided by a summer fire before they will flower. Clearly such orchids have ... provided some thought is given to the basic growing requirements of the plants ie. light, watering and fertilising. Many species (ie. Dendrobium speciosum, gracilicazile, tetragonum, teretifohum, Sarc. falcatus. etc ...
www.bribieislandorchidsociety.com

The BSPP - Publications - BSPP News 41 Spring 2002
... , and planting a Metasequoia glyptostroboides on an island in Snowdonia, and investigating the effects of light intensity on the sporulation of ferns with Walter Schwabe. In 1959 he visited, by bicycle ... first hand experience of farming in much of England and Wales and while the initial stimulus for the visit was BYDV or a grass “problem”, discussions with farmers about all matters ...
www.bspp.org.uk

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