Monday, July 20, 2009
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Ponder the following: Whenever you understand how an appliance, a tool, an equation, the nature or the universe, because we are surprised and very peculiar joy where physics invariably present, is why the name This site is "The Joy of Understanding" have felt safe and this wonderful feeling and that they are continually happy, here you will find material for it.
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I found this video and I think hoc to get started in classical physics that mainly has to do with Sir Newton's that little by little talk, but not a traditional biography, but I will talk some master teachers chismecillos Newton. Enjoy and most importantly, share your opinion.
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We can not understand the physics if we do experiments, so guys, do simple experiments and together we will find an explanation using the physical and especially using their imagination, creativity and intuition . We ...
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To start I recommend you dig into the issue of "Outreach" . One of the great popularizers of science in Mexico is the physicist and writer Sergio to regulate who is convinced that science is not fought with the literature, an idea which of course I share.
's start the wonderful world of science here, articles in various science topics written in a simple and interesting. Image Science
Friday, July 17, 2009
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The sexual reproduction takes place in the flowers. Flowers are the sexual organs of plants and can be male, female or hermaphrodite (both sexes).
Part male called stamens. Is a filament ending in a sac called the anther contains pollen grains.
The female part is the pistil. It consists of stigma, style and ovaries with eggs.
The corolla consists of the set of petals (colored leaves) is appealing to attract insects for pollination.
The cup for attaching the flower to the stem.
playerProcess:
When the flower is mature occurs pollination . The anthers are broken and the pollen falls on the pistil. Sometimes you need the help of insects or wind to enter the pollen in the pistil.
Once pollination occurs, the male gamete contained in the pollen reaches the ovary via stigma and style, there is attached to producing egg fertilization. Produced
fertilization the ovary begins to grow, the petals wither and fall, the pistil is transformed into the fruit and embryos in the seeds. When the fruit reaches maturity will fall and transported the animals to eat the seeds elsewhere.
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Sexual reproduction in a plant seed, Spermatophyta
Reproduction is the ability of all living things generate at some point, other beings like them.
Sexual reproduction involves syngamy or fertilization bone fusion of male and female gametes to produce a zygote, that formed in the embriófitos develop an embryo and this in turn a new plant.
This type of reproduction allows for variation recombinacion de caracteres,lo que facilita la seleccion natural.
Thursday, July 16, 2009
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Modalidades: Son muchas y muy variadas. Entre ellas destacan:
- Las mitosporas .
- Los propágulos .
- La multiplicación vegetativa artificial
REPRODUCCIÓN ASEXUAL NATURAL
- Tubérculos: tallos subterráneos engrosado cuya función es almacenar almidón tubérculo
- Bulbos: tallos subterráneos formados por hojas fleshy concentric with n the time is divided into several bulblets, from which new plants will come out
- Estalones or creeping stems, aerial stems horisontal than when they are very long and touch the ground, roots and stems produce vertical. Risom
- : horisontal underground stems emit a certain distance each upright stems. These structures have buds from which shoots arise form the new shoots, which can indeperdizarse.
VEGETATIVE ARTIFICIAL REPRODUCTION
- Grafts: is inserted into a plant, a branch of another plant similar
- Stakes: reproduction by cuttings is to cut the branch with shoots or buds, plant them in another place and another new plant so octene.
- Cutting or branches: stems that are prepared in containers with water or moist soil where they form new roots, after which they can be transplanted.
- tissue culture: culture conducted in an environment free of microorganisms and using nutrient solutions and plant hormones that trigger the growth of roots, stems and leaves from a fragment of a plant binary Divicion
- : by choke in the middle ground, reproduce two new lower body this occurs in the levdura.