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Topic: Nucleation

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	Nucleation - Wikipedia, the free encyclopedia
		Nucleation is the onset of a phase transition in a small but stable region.
		For example, bubbles of carbon dioxide nucleate shortly after the pressure is released from a container of carbonated liquid.
		In molecular biology, nucleation is used to term the critical stage in the assembly of a polymeric structure, such as a microtubule, at which a small cluster of monomers aggregates in the correct arrangement to initiate rapid polymerization.
	en.wikipedia.org /wiki/Nucleation (547 words)

	MHegazy - Elements of nucleation and growth (Site not responding. Last check: 2007-10-29)
		Nucleation on smooth surfaces is not energetically favored and requires the number of adatoms to be much larger than that at equilibrium (such a condition is referred to as “supersaturation”; [23]).
		This model has been used to theoretically predict the dependence of the nucleation density nx(R,T) for the Stranski-Krastanov (SK) growth mode, which is then compared with the experimental results obtained for the growth of Ag/W(110), Ag/Mo(100), Ag/Si(111), Ag/Si(100) and for rare gases on various substrates [10].
		The model was also used to study the nucleation and growth of metals at defect sites on oxide and halide surfaces and to calculate the energies for defect trapping, adsorption, surface diffusion and pair binding [18].
	www.hostultra.com /~mhegazy/nucleation.htm (2465 words)

	W0196: Protein Crystal Nucleation Kinetics Mediated Through Solubility (Site not responding. Last check: 2007-10-29)
		Nucleation kinetics of tetragonal hen egg-white lysozyme (HEWL) were obtained by the method of initial rates at various protein and precipitant (NaCl) concentrations.
		Nucleation kinetics were measured at a variety of salt concentrations, pH values and temperatures.
		The data were split into two regions: nucleation rates at lower protein concentrations, where heterogeneous nucleation may be the predominant nucleation mechanism and higher protein concentrations that may be a homogeneous nucleation regime.
	www.hwi.buffalo.edu /ACA/ACA02/abstracts/text/W0196.html (333 words)

	Nucleation
		This section deals with the simplest nucleation event, namely the homogeneous nucleation of solid crystals during the freezing of a pure metal.
		In this section, the theories developed earlier in the module are developed to account for nucleation during solid-state transformations.
		It is stressed however, that in most practical situations, the nucleation process is complete well before I reaches a maximum and that in reality, we are interested in a much smaller range of values.
	www.matter.org.uk /matscicdrom/manual/nu.html (1234 words)

	Critical Droplets and Nucleation
		Usually in real life the new phase nucleates on some kind of dust particle, or some defect in the material, or some flaw on the surface of the container.
		Nucleation and Surface Growth: Layer-by-Layer Forever, where we apply nucleation ideas to an out-of-equilibrium surface growth problem, where thermal fluctuations are replaced by shot noise from atoms falling from the sky.
		Nucleating Cracks: Elastic Theory has Zero Radius of Convergence, where cracks are critical droplets separating the solid phase from the broken phase.
	www.lassp.cornell.edu /sethna/Nucleation (796 words)

	Nucleation in synoptically forced cirrostratus
		A continuous cloud-top nucleation zone with a depth depending on the vertical humidity gradient and one of the nucleation parameters is developed afterward.
		For the heterogeneous nucleation cases, intermittent nucleation zones in the mid-upper portion of the cloud form where the relative humidity is on the rise because existent ice crystals falling from higher nucleation zones do not efficiently deplete the excess water vapor and ice nuclei are available.
		When the depth of the nucleation zone is shallow, particle number concentration decreases rapidly as ice particles grow and sediment away from the nucleation zone.
	www.agu.org /pubs/crossref/2005/2004JD005362.shtml (390 words)

	Alibris: Nucleation (Site not responding. Last check: 2007-10-29)
		by Markov, Ivan V. This is the first-ever textbook on the fundamentals of nucleation, crystal growth and epitaxy.
		The book is an up-to-date introduction to the fundamentals of the initial stages of Electrocrystallization, which are dominated by nucleation and growth of the first clusters of the new phase.
		The formation of new phases begins with the process of nucleation and is, therefore, a widely spread phenomenon in both nature and technology.
	www.alibris.com /search/books/subject/Nucleation (540 words)

	FAQ on Crystals for Students
		Nucleation can either start with the molecules themselves (we'll call this unassisted nucleation), or with the help of some solid matter already in the solution (we'll call this assisted nucleation).
		Now other solute molcules begin growing on the surface of the crystal and it keeps on getting bigger until there is an equilibrium reached between the solute molecules in the crystal and those still dissolved in the solvent.
		Pretty much the same thing happens as in unassisted nucleation, except that a solid surface (like a stone, or brick) acts as a place for solute molecules to meet.
	www.xray.ncsu.edu /student_faq_xtal.html (1930 words)

	Centrosome maturation: Measurement of microtubule nucleation throughout the cell cycle by using GFP-tagged EB1 -- Piehl ...
		Centrosome maturation: Measurement of microtubule nucleation throughout the cell cycle by using GFP-tagged EB1 -- Piehl et al.
		(25) to inhibit nucleation from metaphase and anaphase centrosomes.
		The mechanism responsible for centrosomal nucleation in the
	www.pnas.org /cgi/content/full/101/6/1584 (2923 words)

	Mesoscale Numerical Prediction of Clouds and Cloud Effects
		It is a further evolution of the microphysics model from the two-moment scheme described by Meyers et al.
		Physical processes represented in the model include vapor and heat diffusion, collision and coalescence between all possible pairs of hydrometeor types including self-collection, melting and freezing, heterogeneous nucleation of ice through contact and deposition freezing, homogeneous nucleation of cloud droplets and haze into ice crystals, shedding of liquid water by hail, and sedimentation.
		Any number of chemical types and size distributions of hygroscopic aerosol may be prognosed in the model, but it is planned to use three categories as a standard.
	rams.atmos.colostate.edu /mexicoarticle.html (3110 words)

	Nucleation and Growth
		combine these two terms (multiplication) to determine the total nucleation rate
		The maximum rate of nucleation is at some T < T
		total rate of forming solid is product of nucleation rate and growth rate
	www.uccs.edu /~tchriste/courses/PHYS549/549lectures/nucleation.html (241 words)

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