nanometres
71Tunable laser — A tunable laser is a laser whose wavelength of operation can be altered in a controlled manner. While all laser gain media allow small shifts in output wavelength, only a few types of lasers allow continuous tuning over a significant wavelength… …
72Titanium dioxide (B) — or TiO2(B) is the monoclinic form of titanium dioxide. The mineral is found in weathering rims on tektites and perovskite and as lamellae in anatase from hydrothermal veins [1] and has a density lower than that of the other three polymorphs. In… …
73Gliese 581 — Gliese 581 The star Gliese 581. Digitized Sky Survey photo. Observation data Epoch J2000.0      Equinox J2000.0 (ICRS) …
74William Astbury — William Thomas Astbury FRS (Bill Astbury, 25 February,1898 mdash; 4 June,1961) was an English physicist and molecular biologist who made pioneering X ray diffraction studies of biological molecules. His work on keratin provided the foundation for …
75Postsynaptic density — The postsynaptic density (PSD) is a cytoskeleton specialization at neuronal synapses that was originally identified as an electron dense region at the membrane of a postsynaptic neuron, as viewed by electron microscopy. PSDs are usually composed… …
76Chelsea filter — In gemmology, a Chelsea filter is a dichromatic optical filter used for identifying coloured stones. Contents 1 History 2 Use 3 See also 4 External links …
77Bacteria — Taxobox color = lightgrey name = Bacteria fossil range = Archean or earlier Recent image width = 210px image caption = Escherichia coli image is 8 micrometres wide. domain = Bacteria subdivision ranks = Phyla [cite web… …
78Paulingite — Infobox mineral name = Paulingite category = Zeolite Group boxwidth = boxbgcolor = imagesize = caption = formula = (K,Na,Ca)3 4(Si,Al)21O42 ·17 22H2O molweight = color = Colorless, light yellow, orange, red habit = typically as euhedral crystals… …
79Quantum well laser — Origin of the concept of quantum wells= In 1972, Charles H. Henry, a physicist and newly appointed Head of the Semiconductor Electronics Research Department at Bell Laboratories, had a keen interest in the subject of integrated optics, the… …
80Reverse osmosis — Schematics of a reverse osmosis system (desalination) using a pressure exchanger. 1: Sea water inflow, 2: Fresh water …
