Light shield

If only the extreme apex of the oat coleoptile is irradiated unilaterally, curvature nevertheless develops normally, migrating down to the light shielded region (first positive curvature). This observation led to the demonstration by Boysen-Jensen in 191018), showing that the principle causing curvature could be transmitted across... 

Weak beta radiation and alpha particles often cannot penetrate the covering material but the use of a scintillant, which, together with the sample, will dissolve in a suitable solvent, enables a similar technique to be used. Liquid scintillation counters usually consist of two light-shielded photomultiplier... 

Flavonoids often participate in plant reproduction, in the protection of reproductive tissues and seeds, and in seedling development. This may, in part, be due to their role in UV light shielding (thereby protecting DNA) and antioxidant properties, but other functions are also important. 

It is used for cosmetics and paints as transparent UV-light shielding chemical. 

Light shields are provided between a CdTe substrate and an HgCdTe film in JP-A-62104163 to reduce the problem of cross-talk. 

A common electrode and a light shield film are combined in JP-A-2086177. The film surrounds the photodiodes of an imager. 

Infrared rays which are incident to regions 25 penetrate into the silicon nitride layer and ZnS layer are thereby partly attenuated and reflected, and are finally reflected from the metal layer. The incident rays and the reflected rays cause a complex interference with each other, and an apparent overall reflectance of the light shield layer is reduced if proper thickness and refraction index are chosen for each layer of the insulation layer. Preferable, the refractive index of the first layer 8 is less than the refractive index of the second layer 9. 

In a second embodiment, the detector elements 1 are protruding from a flat light shield layer 21. Bumps 13 are used to connect the array to a signal processing substrate 32. The light shield layer comprises the same layers as in the first embodiment. 

There was a click and she was blinded once again as she was fixed by a piercing light. Shielding her eyes, she saw that he d turned on a desk lamp that stood on the workbench Cau in its spotK, Jenny heard the scrape of a chair, the creak of it taking his weigh as he sat down in the shadows. 

Photographic films with nuclear emulsions are used successfully in order to record very rare events induced by cosmic radiation. For this purpose, light-shielded packages of films have been carried by balloons to high altitudes. Some elementary particles, e.g. the positron and the n meson, have been detected by use of photographic emulsions. 

Determination of optical activity can be made in the student laboratory with a Zeiss Pocket Polarimeter, which requires no monochromatic light source and no light shield. For construction of a very inexpensive polarimeter, see W. H. R. Shaw, J. Chem. Ed., 32, 10 (1955). 

A slurry of Chlamydomonas sp. YA-SH-1 cells of 15 %(w/w) dry weight was kept at 25 °C in a light-shielded airtight tube. 

Ethidium bromide 10 mg/mL in water, stored at room temperature in light-shielded bottles. 

The rates of homogeneous vapor phase chemical reactions are usually faster than heterogeneous chemical reactions of particulate PAHs with sunlight and oxidants in the atmosphere, particularly due to light shielding and stabilizing (toward both oxidation and photolysis) effects in the adsorbed state (Behymer and Hites 1988). 

Fig. 7.8.4 Interline-transfer charge-coupled device with column light shields for vertical charge transfer...

The signal-processing circuit is protected by an aluminum light shield to avoid accidental starting of elements such as a transistor when the sensor is exposed to sunlight. 

It is unclear at this time how the light sensitivity of OTFTs compares to silicon-based TFTs, but it is certain that similar light-shielding measures must be employed. Studies in our laboratory have shown that, in addition to the photocurrents generated by incident illumination, long-lived light-induced threshold shifts can occur in pen-... 

Persotmel working with plutonium must be protected by light shielding. The external radiation to be shielded includes ganunas from alpha and beta decay, internal conversion x-rays, ganunas, and neutrons from spontaneous fission, and neutrons from (a, n) reactions in materials of low atomic number. Neutron yields for various types and forms of plutonium are listed in Table 9.15. 

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