نتایج جستجو برای: 300 micrometers
تعداد نتایج: 88762 فیلتر نتایج به سال:
We present an easy and effective method for the encapsulation of cells inside PEG-based hydrogel microstructures fabricated using photolithography. High-density arrays of three-dimensional microstructures were created on substrates using this method. Mammalian cells were encapsulated in cylindrical hydrogel microstructures of 600 and 50 micrometers in diameter or in cubic hydrogel structures in...
Pollen tubes of Tradescantia growing on media containing 10(-3) M-Ca2+ and 10(-2)M-Ca2+ exhibit growth rates of 28 micrometers min-1 and 7 micrometers min-1, respectively. The rates of vesicle production by the dictyosomes in these tubes were determined from the rates at which vesicles accumulated in the cytoplasm after treatment with cytochalasin D. Although the vesicle requirements for these ...
A newly discovered population of organic walled microstructures from the Swaziland System, South Africa, is considered to be biological on the following grounds: (i) the structures are carbonaceous and occasionally have internal organic contents; (ii) the population has a narrow unimodal size frequency distribution (average diameter, 2.5 micrometers; range, 1 to 4 micrometers); (iii) the struct...
A high-gain harmonic-generation free-electron laser is demonstrated. Our approach uses a laser-seeded free-electron laser to produce amplified, longitudinally coherent, Fourier transform-limited output at a harmonic of the seed laser. A seed carbon dioxide laser at a wavelength of 10.6 micrometers produced saturated, amplified free-electron laser output at the second-harmonic wavelength, 5.3 mi...
Interference between two freely expanding Bose-Einstein condensates has been observed. Two condensates separated by approximately 40 micrometers were created by evaporatively cooling sodium atoms in a double-well potential formed by magnetic and optical forces. High-contrast matter-wave interference fringes with a period of approximately 15 micrometers were observed after switching off the pote...
The reaction of species in solutions flowing laminarly (without turbulent mixing) inside capillaries was used as the basis for a broadly applicable method of microfabrication. In this method, patterning occurs as a result of transport of reactive species to interfaces within the capillary by laminar flow. A wide range of chemistries can be used to generate structures with feature sizes of less ...
Reducing the dark current of InGaAs/InP avalanche photodiodes (APDs) is an important way to improve its performance. Decreasing active size can reduce but sacrifice quantum efficiency. In this paper, metal–insulator-metal (MIM) microcavity integrated with APD, which converge light from tens micrometers several micrometers, so as compensate for loss detection efficiency caused by reduction APD. ...
We study experimentally and by micromagnetic simulations the propagation of spin waves in 100-nm thick YIG waveguides, where width linearly decreases from 2 to 0.5 micrometers over a transition region with varying length between 2.5 10 micrometers. show that this geometry results down-conversion wavelength, enabling efficient generation wavelengths down 350 nm. also find leads modification grou...
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