Alternate generation


  • Webster's Revised Unabridged Dictionary
    • Alternate generation (Biol) alternation of sexual with asexual generation, in which the products of one process differ from those of the other, -- a form of reproduction common both to animal and vegetable organisms. In the simplest form, the organism arising from sexual generation produces offspiring unlike itself, agamogenetically. These, however, in time acquire reproductive organs, and from their impregnated germs the original parent form is reproduced. In more complicated cases, the first series of organisms produced agamogenetically may give rise to others by a like process, and these in turn to still other generations. Ultimately, however, a generation is formed which develops sexual organs, and the original form is reproduced.
    • Alternate generation (Biol) See under Generation.
    • ***


In literature:

The motor generator consisted of one alternating current motor driving two direct current generators.
"Tom Swift and his Electric Locomotive" by Victor Appleton
Such changes, however, reach their acme in the so-called alternate generations of some of the lower animals.
"On the Origin of Species" by Charles Darwin
Alternate generations, in Hydrozoa.
"More Letters of Charles Darwin Volume II" by Charles Darwin
This is termed alternation of generations.
"Scientific American Supplement, Vol. XXI., No. 531, March 6, 1886" by Various
The alternating tendencies so well marked in the generations of the Romanoff rulers made themselves felt at the accession of Nicholas II.
"The Development of the European Nations, 1870-1914 (5th ed.)" by John Holland Rose
The phenomenon of giantism of this nature occurs in alternate generations and then only in rare instances.
"Astounding Stories of Super-Science, December 1930" by Various
"A Mechanico-Physiological Theory of Organic Evolution" by Carl Von Nägeli
The undamped or "continuous" waves are generated by means of a high-frequency alternator or Poulsen arc.
"Wireless Transmission of Photographs" by Marcus J. Martin
There are two types of dynamo, one generating a direct and the other an alternating current.
"Electricity and Magnetism" by Elisha Gray
What is meant by the expression "alternation of generations"?
"A Guide for the Study of Animals" by Worrallo Whitney

In news:

Power Pack Offers Quiet, Convenient Alternative to Generators, Extension Cords .
Despite a vague veto threat by President Barack Obama, the House on Thursday easily passed a major defense policy bill that calls for continued development of a costly alternative engine for the Pentagon's next-generation fighter jet.
That's about the extent of the voter interest generated for the leading candidate so far by the alternate political reality that is Americans Elect.
Power Pack Offers Quiet, Convenient Alternative to Generators, Extension Cords.
The dependence on scarce resources has fostered corrosive politics at home and abroad – and efforts to generate renewable energy have provided few viable alternatives to traditional fuels.
Methane Generator, Alternative Energy Store, and Other Items.
The Army issued a draft request for proposals today to purchase over a 30-year period $7 billion worth of power generated from alternative energy sources, including solar, wind, geothermal and biomass.
With gas and oil prices at a premium, exploring alternative energy sources is possibly one of the greatest quests of our generation.
Its defeat is a setback for those hoping for reduced traffic congestion and more encouragement of alternative transportation to reduce generation of the greenhouse gases.
The Power-Tiny is the perfect alternative to full-size fog generators for live productions.
Methane Generator, Alternative Energy Store, and Other Items.
Thirty years ago, the Phoenix was the essential paper for a new generation of readers: those interested in a smart, countercultural alternative to the offerings of the mainstream press.
With a wink to the comic books of old, yet with a postmodern, Generation-X sensibility, local pop artists have found an outlet for their doodling ways in Alternating Crimes Publishing 's Hell Car Comix.
University officials say the center that opens Monday in College Park will be focused on alternative energy generation and storage.
You do have alternatives for tapping into reserves to generate cash.

In science:

There are some alternatives, but roughly one proceeds at each time step sequentially through the population of males and females determining the ones that are killed by genetic causes or by random deaths, and then mate them to generate the newborn.
Random deaths in a computational model for age-structured populations
An alternative generating function would be obtained by replacing the ratio of the two determinants by detn (D + z ) and putting n → 0 after having calculated the resolvent.
Random Matrix Theory and Chiral Symmetry in QCD
Hence, it is clear that an alternate method of generating path (which need not be shortest) becomes necessary in these networks.
Random spread on the family of small-world networks
This may give some alternative discussion of the cosmological constant since the vacuum energy generated by quantum fluctuations of fields living on the brane may not curve the brane itself but instead the space transverse to it.
Fine-Tuning of the Cosmological Constant in Brane Worlds
The first is the generation, by a local deterministic mechanical rule, of an expanding profusion of alternative possible branches, with each branch corresponding to an entire classical ly describable brain embodying some specific possible course of action.
Quantum theory and the role of mind in nature