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Topic: Biological life cycle

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  Biological life cycle - Wikipedia, the free encyclopedia
A life cycle is a time of development of one generation of a species, whether through asexual reproduction or sexual reproduction, and especially in regard to its ploidy.
Zygotic and gametic meiosis have one mitotic stage and form: during the n phase in zygotic meiosis and during the 2n phase in gametic meiosis.
The individuals or cells as a result of mitosis are haplonts, hence this life cycle is also called haplontic life cycle.
www.wikipedia.org /wiki/Life_history   (539 words)

 Life article - Life eternal life artificial life extraterrestrial life WordNet Longman - What-Means.com   (Site not responding. Last check: 2007-11-07)
Life is a multi-faceted concept with no simple definition, in part because the word is often used in an intentionally open-ended way, as exemplified by phrases such as "eternal life", "artificial life", and "extraterrestrial life".
A useful characteristic upon which to base a definition of life is that of descent with modification: the ability of a life form to produce offspring that are like its parent or parents, but with the possibility of some variation due to chance.
In all known life forms (assuming prions are not counted as such), the genetic material is primarily DNA or the related molecule, RNA.
www.what-means.com /encyclopedia/Life   (1165 words)

 The Origin and Evolution of Trematode Life Cycle
It is the life cycles in general and the stages that comprise these cycles that are the focus of the detailed analysis presented herein.
The authors have attempted to typologization the life cycles of modern trematodes The original scheme of probable ways of their transformations in the course of taxon evolution and its penetration into ecosystems of different sorts is given.
Life cycles of this type are characteristic of the most modern trematodes both keeping some archaic characters (Heterophyidae, for example) and the most advanced (Strigeidida, Palgiorchiida).
www.angelfire.com /sc/gorbushin/galbook.html   (1905 words)

 Longest Life Cycle
Life cycle is defined as the sequence of events from egg to reproducing adult.
Insects have solved the problems of synchronizing life cycles to seasonal periodicities and responding to other biotic and abiotic factors with an impressive array of tactical alternatives.
In summary, although 17-year cicadas are well-known for their long life cycle in natural habitats, some wood beetle species definitely have the longest life cycles in exceptional habitats.
ufbir.ifas.ufl.edu /chap12.htm   (996 words)

 Station Information - Biological life cycle
In the biology of eukaryotic organisms, a life cycle includes the major sexual stages of a species, especially in regard to its ploidy (basic number of chromosomes).
There are three types of cycles: zygotic meiosis, gametic meiosis, and sporic meiosis.
Diagrams of life cycles in green algae from the University of Hawaii
www.stationinformation.com /encyclopedia/b/bi/biological_life_cycle.html   (365 words)

Nematodes share a relatively simple life cycle consisting of an egg stage, four juvenile (or larval) stages (often referred to as J1, J2, J3, and J4) and an adult stage.
The variations on this simple life cycle pattern that have developed as parasitic nematodes have exploited different habitats are truly fascinating.
Sometimes all of the life cycle stages are able to infect a host while in other species only one life cycle stage is infective.
ucdnema.ucdavis.edu /imagemap/nemmap/Ent156html/intro/98lifecy   (673 words)

The identification of this parasite by morphological and biological features does not offer difficulties and differential is only required for Trypanosoma rangeli, a non-pathogenic flagellate which infects humans in some areas of Central and South America and is transmitted by some of the same vectors that transmit T. cruzi.
T. cruzi is not a homogeneous population and is composed rather by a pool of strains which circulate in both the domestic and sylvatic cycles involving humans, vectors and animal reservoirs of the parasite.
T. cruzi evolves during its cycle into different forms which are identified by the relative position of the Kinetoplast in relation to the cell nucleus and the flagellum emergence.
www.dbbm.fiocruz.br /tropical/chagas/chapter3.html   (1505 words)

 WoodyPest Glossary
Classical biological control typically is performed by personnel of university and federal and state departments of agriculture.
Once a classical biological control agent is imported and populations of it are established, the benefits of its actions are free; the natural enemy is not for sale, nor is there any point in selling it.
The aim of biological control (an action by man) is to use whichever of the natural enemies that can be manipulated to improve on the suppressive effects provided by nature.
woodypest.ifas.ufl.edu /gloss.htm   (4664 words)

 The Life Cycle of the Mosquito
The length of life of the adult mosquito usually depends on several factors: temperature, humidity, sex of the mosquito and time of year.
The mosquito goes through four separate and distinct stages of its life cycle and they are as follows: Egg, Larva, pupa, and adult.
might go through its life cycle in 14 days at 70 F and take only 10 days at 80 F. Also, some species have naturally adapted to go through their entire life cycle in as little as four days or as long as one month.
www.mosquitoes.org /LifeCycle.html   (1458 words)

 Insect Life Cycle
There is great variability among insects in the length of the life cycle, from a few days to many years, in the method of development, in the appearance and habits of the stages leading to adulthood and even between successive life cycles.
In these insects the life cycle is synchronized to the seasonal cycle, often by the overwintering stage.
The life cycles are usually complicated, involving alternate hosts, winged and non-winged adults, different feeding patterns, etc. The aphids (Homoptera) and gall wasps (Hymenoptera) are the most typical of these groups.
classes.entom.wsu.edu /348/Life_cycle.htm   (1358 words)

 Living Things: Daily Living
Another organism with a rapid life cycle is the fruit fly.
During the fruit fly's life cycle, it changes from egg to larva to pupa to adult.
Each of the four distinct life phases is a natural part of the life cycle.
www.fi.edu /tfi/units/life/living/living.html   (1076 words)

 Carolina Biological: Salmon Life Cycle: The Incredible Journey
The life cycle of sockeye salmon is an incredible journey that begins and ends in the cold freshwater streams of the Pacific Northwest.
All events that are harmful to the salmon life cycle are followed by a command that tells the player to go back one or 2 spaces (or miss a turn).
When your students are ready for further explorations of the salmon life cycle, river and stream ecology, and marine life, we have the resources to help you advance their knowledge.
www.carolina.com /calendar_activities/2003/0203.asp   (1276 words)

 Rimrock Foundation - Depression and women in addictions such as alcoholism, drug addiction, compulsive gambling, eating ...
Researchers continue to explore how special issues unique to women, biological, life cycle and psycho-social, may be associated with women's higher rates of depression.
People with dysthymia are frequently lacking in zest and enthusiasm for life, living a joyless and fatigued existence that seems almost a natural outgrowth of their personalities.
Women's reproductive events include the menstrual cycle, pregnancy, the post pregnancy period, infertility, menopause, and sometimes, the decision not to have children.
www.rimrock.org /resources/women.shtml   (1995 words)

 The Environmental Literacy Council - Carbon Cycle
Carbon is one of the fundamental building blocks of life; we are carbon-based life forms.
The geological carbon cycle takes place over hundreds of millions of years and involves the cycling of carbon through the layers of the Earth.
The biological/physical carbon cycle occurs over days, weeks, months and years and involves the absorption, conversion, and respiration of carbon by living organisms.
www.enviroliteracy.org /article.php/478.html   (1052 words)

 Articles - Meiosis   (Site not responding. Last check: 2007-11-07)
Meiosis occurs in all eukaryotic life cycles involving sexual reproduction, comprising of the constant cyclical process of meiosis and fertilization.
There are three types of life cycles that utilise sexual reproduction, differentiated by the location of the organism stage.
In the gametic life cycle, of which humans are a part, the living organism is diploid in nature.
www.gaple.com /articles/Meiosis   (2098 words)

 Reproduction and life cycle (from echinoderm) --  Encyclopædia Britannica
Life is further characterized by the presence of complex transformations of organic molecules and by the organization of such molecules into the successively larger...
Most of the stories that form the Fenian cycle were written down in the 12th century.
The plant life cycle consistis of two phases: the Sporophyte generation and the Gametophyte generation.
www.britannica.com /eb/article-25731?tocId=25731   (678 words)

 Shortest Sexual Life Cycle
The sexual life cycle of insects depends on species characteristics and environmental conditions.
Psorophora confinnis is apparently the insect with the shortest sexual life cycle.
Life history studies on artificially produced broods of flood water mosquitoes in the Tennessee Valley.
ufbir.ifas.ufl.edu /chap16.htm   (654 words)

 Cycle Biological Aquarium Supplement 4oz
Cycle is the most highly concentrated preparation of living bacteria--500 billion per dose.
Often, they have already started their life cycle in the bottle before being added to the aquarium.
Cycle's bacteria are dormant and will generally remain suspended for long periods of time.
www.petmeister.com /item2430.htm   (352 words)

 Phenology - Wikipedia, the free encyclopedia
Because many such phenomena are very sensitive to small variations in climate, phenology is useful in the study of climate change.
This usually means recording and comparing the life cycles of plants and animals, for example the dates of bird migration, plant budding, flowering or fruiting, insect activities, stages of birth and death are all annual events of interest to phenologists.
In Japan and China the time of blossoming of cherry and peach trees is associated with ancient festivals and some of these dates can be traced back to the eighth century.
en.wikipedia.org /wiki/Phenology   (412 words)

 Biological life cycle   (Site not responding. Last check: 2007-11-07)
In biology, a life cycle includes the major sexual stages of a species, especially in regard to its ploidy.
In the whole cycle, gametes only diploid cell; mitosis occurs only the diploid phase.
Diagramatically, sporic meiosis looks like the complex halves of #Gametic meiosis and #Sporic meiosis are merged into one.
www.sciencedaily.com /encyclopedia/biological_life_cycle   (423 words)

 The CEO Refresher - Life Beyond the Sigmoid Curve   (Site not responding. Last check: 2007-11-07)
Cycle times, especially product development cycle times and the focus on accelerated 'speed to market' have dramatically altered the playing field.
The next ‘life’ beyond the curve is that of living the paradox of change.
The obvious desired point at which to start a new cycle is before the plateau, where you have the time, energy, and resources to get the new launch through the early stages of exploration and adjustment before the first curve dips downwards.
www.refresher.com /!paradox.html   (864 words)

 [No title]
Life Cycle of Euonymus Scale Many of the 140-plus species of euonymus are susceptible to euonymus scale.
Euonymus scale begin life as eggs produced by the female under her protective covering.
Successful biological control of euonymus scale will lessen the amount of pesticides used in the urban environment.
www.ceris.purdue.edu /napis/pests/es/facts.txt   (1657 words)

 Biological Control of Leafy Spurge   (Site not responding. Last check: 2007-11-07)
Biological control of a weed involves the use of parasites, predators and pathogens.
The biological control of leafy spurge which was brought over to Canada from Eastern Europe in the 1800's involved a number of steps:
Although the adult beetles feed on the spurge leaves it is the larvae that are primarily responsible for the biological control of the plant.
www.agr.gov.sk.ca /DOCS/crops/integrated_pest_management/weed_control/Biocon.asp?printerversion=1   (809 words)

 IPM and Biological Control of Plant Pests: Horticultural Crops   (Site not responding. Last check: 2007-11-07)
Commercially available natural enemies are listed, current research in biological control is described, incorrect criticism of biological control is discussed and specific advantages of using this control method in protected crops are given.
Biological control of bruchids should receive more attention in particular research on the introduction and conservation of natural enemies.
Results in relation to the effect of host plants on the foraging behavior of adult parasitoids and to the biological control of oriental fruit fly and melon fly in an agricultural ecosystem were discussed.
www.nal.usda.gov /afsic/AFSIC_pubs/qb94-12.htm   (16630 words)

 Algae - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-07)
In very high densities (so-called algal blooms) they may discolor the water and outcompete or poison other life forms.
The seaweeds grow mostly in shallow marine waters; some are used as human food or are harvested for useful substances such as agar or fertilizer.
Some of the more common organizational levels, more than one of which may occur in the life cycle of a species, are:
www.newlenox.us /project/wikipedia/index.php/Alga   (1190 words)

 EO Library: The Carbon Cycle Page 2
Nearly all forms of life on Earth depend on the production of sugars from solar energy and carbon dioxide (photosynthesis) and the metabolism (respiration) of those sugars to produce the chemical energy that facilitates growth and reproduction.
All of these biologically mediated processes represent a removal of carbon dioxide from the atmosphere and storage of carbon in geologic sediments.
Carbon on the Land and in the Oceans: The modern carbon cycle
earthobservatory.nasa.gov /Library/CarbonCycle/carbon_cycle2.html   (367 words)

 Squash Vine Borer, HYG-2153-92
Life stages of squash vine borer; adult male (a), adult female (b), egg (c), larva (d), earthen cell (f), pupa (g).
A trap baited with the squash vine borer's sex pheromone would be a useful tool in determining when the moths are active.
The biological insecticide B.t., in the forms currently available, is not effective because it cannot be applied to the plant parts that are eaten by the borer.
ohioline.osu.edu /hyg-fact/2000/2153.html   (1007 words)

 Reproduction and life cycle (from gasterosteiform) --  Encyclopædia Britannica
Reproduction and life cycle (from gasterosteiform) --  Encyclopædia Britannica
Except for sticklebacks, pipefishes, and sea horses, little is known of the life cycles of Gasterosteiformes.
More results on "Reproduction and life cycle (from gasterosteiform)" when you join.
www.britannica.com /eb/article-63567?tocId=63567   (700 words)

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