Google
Support independent publishing: buy this book on Lulu.

Sunday, June 26, 2011

MULTICELLULAR ORGANISMS

WATCH VIDEO

Having been created the conditions for life on Earth appeared the first unicellular organisms. It is assumed that about 1300 million years were generated about 20 attempts -most failed- to generate multicellularity. However, the first fossil record of multicellular animals dated from the Precambrian (700 million years). Now, through a simple experiment William Ratcliff (University of Minnesota/St Paul/Oklahoma), has generated a multicellular organism from a single-celled yeast. For this, scientists grown unicellular fungi in liquid medium, re-cultivating the supernatants where unicellular fungi remained joined together. 60 days (350 generations) were necessary to form "snowflakes", genetically identical cells connected to each other after each division. The funny thing is that each formed cluster acts as a multicellular organism in which each cell works for the good of all, evolving the cluster as a unit. Some skeptics argue that ancestors of this fungus were multicellular millions of years ago and this fungi have retained the evolutionary mechanisms of cell adhesion and programmed cell death.


MULTICELULARIDAD

Creadas las condiciones para albergar vida en la Tierra aparecieron los organismos unicelulares. Se presume que hace unos 1300 millones de años se generaron unos 20 intentos -la mayoría frustros- para generar multicelularidad. No obstante, los primeros registros fosiles de animales multicelulares datan del Precámbrico (700 millones de años). Ahora, mediante un sencillo experimento William Ratcliff (University of Minnesota/St Paul/Oklahoma), ha generado un organismo multicelular a partir de un hongo unicelular, Para ello, los científicos hicieron crecer hongos unicelulares en medio liquido, re-cultivando los sobrenadantes superiores donde los hongos unicelulares se mantenían unidos entre si. 60 dias (350 generaciones), fueron necesarias para formar conglomerados ("snowflake"), celulares genéticamente idénticos conectados entre si despues de cada división. Lo curioso es que cada conglomerado funciona como un organismo multicelular en el que mediante divisiones del trabajo cada celula trabaja en bien del conjunto, evolucionando como una unidad. Algunos escépticos arguyen que los antecesores de este hongo fueron multicelulares hace millones de años y que los hongos actuales han retenido los mecanismos evolutivos de adhesión celular y muerte celular programada.

Labels:

21 Comments:

Anonymous Anonymous said...

prada bags online
I've been surfing on-line more than three hours
nowadays, but I by no means found any interesting article like yours.

It's pretty price enough for me. Personally, if all webmasters and
bloggers made excellent content material as you probably did,
the internet can be much more useful than ever before.

9:35 AM  
Anonymous Anonymous said...

I’m not that much of a online reader to be honest but your sites really nice,
keep it up! I'll go ahead and bookmark your site to come back in the
future. All the best

my page :: caa mendesign rumah

1:42 AM  
Anonymous Anonymous said...

Wow, this article is pleasant, my younger sister is analyzing these things, thus I am going to let know her.


my web blog diatomaceous earth (www.veja.org)

6:02 PM  
Anonymous Anonymous said...

Today, I went to the beach front with my children. I found a sea shell and gave
it to my 4 year old daughter and said "You can hear the ocean if you put this to your ear." She placed the
shell to her ear and screamed. There was a hermit crab inside and it pinched her ear.
She never wants to go back! LoL I know this is completely off topic but
I had to tell someone!

Also visit my blog - garcinia cambogia extract pure

12:17 PM  
Anonymous Anonymous said...

I've been browsing online greater than three hours lately,
yet I by no means discovered any attention-grabbing article like yours.

It is lovely worth enough for me. In my opinion, if all site owners and bloggers made excellent content material as you probably did, the web
might be much more useful than ever before.

Stop by my weblog - home renovator (http://www.homeimprovementdaily.com)

6:42 AM  
Anonymous Anonymous said...

This is necessary because you have to make sure that the format of the videos is compatible
with your system. A vast range of free movie
download sites has steadily sprung up in the main fame of this novel technology.
The BUZZ Player is available in the i - Tunes App Store for $1.


My web blog ... film streaming

10:53 PM  
Anonymous Anonymous said...

Sweet blog! I found it while searching on Yahoo News.
Do you have any suggestions on how to get listed in Yahoo News?

I've been trying for a while but I never seem to
get there! Thank you

Also visit my site ... web site

11:16 AM  
Anonymous Anonymous said...

As Rockstar Games has now spread beyond the selective user base as well as you know
what transformers legends hack type of games.
These remarkable upgradations in the handy forms.
Once get tired of that you will need to do,
but just to have grown to 9%.

Have a look at my site: Transformers legends hack tool indir

8:28 AM  
Anonymous Anonymous said...

Greate article. Keep posting such kind of information on your site.
Im really impressed by it.
Hello there, You have performed an incredible job. I'll certainly digg it and in my
view suggest to my friends. I'm confident they'll
be benefited from this site.

my weblog :: http://www.kittykit.co.uk/17-cat-collars

1:21 PM  
Anonymous phuket house for sale said...

phuket house for sale

12:46 AM  
Anonymous Wisata said...

I'd love the post contents you have here.
following article links

12:26 PM  
Anonymous Amir said...

Thanks so much! inilahresep.com inilahcara.com inilahmanfaat.com inimotorku.com

11:48 AM  
Anonymous wisata bandung said...

Nice article... thanks

8:29 AM  
Blogger sintiafaiturahim said...

love it your post

Tempat Wisata di Bogor

3:01 PM  
Blogger sintiafaiturahim said...

Objek Wisata Pulau Pari
Tempat Wisata di Jogja

3:02 PM  
Blogger xjd7410@gmail.com said...

This comment has been removed by the author.

1:08 AM  
Blogger Kerish Walk said...

tools for fb hack

11:11 AM  
Blogger Unknown said...

code d'activation avast 2016

12:36 PM  
Blogger yanmaneee said...

yeezy shoes
nike air force 1 low
coach outlet store online
fitflop sale
yeezy 700
kyrie 6
michael kors outlet
nike air max
kyrie irving shoes
coach outlet

11:13 AM  
Anonymous Anonymous said...

I got what you intend,saved to bookmarks, very nice site.

1:15 AM  
Anonymous Anonymous said...

Navy SEALS V Demons
Jan 29, 2023. Do visit Hulu immediately and start enjoying premuum films and TELEVISION collection.Since you
possibly can stream the movies totally frfee with none subscription, the service supports itsellf by working quick pre-roll and
mid-roll adverts from time to time. Disney Plus is a subscription-primarily basedd OTT
streaming service launched by the media conglomerate,
Disney.

Movie4k to is a Free Motion pictures streaming website with zero advertisements.

Many online streaming web sites on the web are deceiving in nature, and so
they simply try to inject malware into your system.

You can too watch movies free of charge on the video streaming big.
Freee streaming websites, which are not authorized content providers, aree always
crfitical as a consequence of data breaches and privateness invasion points.


Additionally, if your IP deal with is blocked by any of these streaming services due to your nation of
residence, a good VPN can get you unblocked. You can now watch movies wherever!
It might take 2-three attempts to click on a movie thumbnail and 5-6 attempts to get
the movie streaming.

Kanopy: One of the vital user-pleasant ites providing free TELEVISION reveals and movies streaming.

You may watxh free motion pictures on-line through quite
a lot of streaming service web sites andd apps. There are not any advertisements on HiMovies.
Go to a website that offers free films.

However you too can get new and widespread films which might be
free too watch. Presently it hosts plenty oof in style titles from the
Marvel Cinematic Universe, Pixar Studios, Star Wars Franchise, Traditional
Disney motion pictures, Animations, and Disney+ Originals.

1:48 AM  

Post a Comment

<< Home