KOKETA

 

humedo - 09/11/2009 23:27:51 said:

medias tetas!!!
tienes los pezones grandes????

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jorge_17 - 23/08/2009 20:14:28 said:

hola chiquita linda espero estes de lo mejor gracias por pasarte por mi espacio aqui te devuelvo el _______ por cierto linda pic te espero de nuevo en mi flog te me cuidas chau.....

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jessi_ljm - 15/08/2009 20:19:39 said:

ola paso paste besossssssssssssss



yop' jessi

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demi_jonas - 27/07/2009 18:10:18 said:

lenda peck

estas en mis ff
t pasas

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LOKAAAAA - 16/06/2009 02:50:38 said:

the Mitotic index is a measure for the proliferation status of a cell population. It is defined as the ratio between the number of cells in mitosis and the total number of cells. Cells in the cell cycle can be identified using antibodies against the nuclear antigen Ki-67. The mitotic index can be worked out from a slide, even with light microscopy. It is the number of cells containing visible chromosomes divided by the total number of cells in the field of view.
If you administer colchicine or other colchicine-derivative medications (i.e. colcemid) you can arrest the cell cycle at this point leaving the chromosomes in their visible form. Colchicine disrupts the microtubule formation which is necessary for the spindle fibers to separate the chromosomes during anaphase.and also Cell population growth occurs as cells pass through interphase and mitosis to complete the cell cycle. Many cells lose the capacity to divide as they mature or divide only rarely. Other cells are capable of rapid cell division. For example, as plant roots grow, cells near the tip of the root, in the apical meristem, divide rapidly to push the root through the soil. The root cap detects the pull of gravity and directs the rapid growth of cells near.and they the most import is the group of cells that rarely complete the cell cycle, we expect a high proportion of cells to be in the resting stage of the cell cycle (G1). However, in a rapidly dividing cell population, we expect a high proportion of cells to be in the stage of mitosis. One way to quantify cell division is by using the mitotic index:

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parte 3 - 15/06/2009 19:26:59 said:

The mitosis is the type of cellular division by which the orgánulos and the contained genetic information in their chromosomes are conserved, that pass this way to the cells resulting daughters of the mitosis. The mitosis is also a true process of cellular multiplication that participates in the development, the growth and the regeneration of the organism. This process takes place by means of a series of successive operations that are developed of a continuous way, and that stops to facilitate their study has been separated in several stages.and The essential result of the mitosis is the continuity of the hereditary information of the cell mother in each one of the two cells daughters. The genome is made up of a certain amount of genes organized in chromosomes, DNA fibers very coiled that contain the vital genetic information for the cell and the organism. Since each cell must contain complete the own genetic information of its species, the cell mother must make a copy of each chromosome before the mitosis, so that the two cells daughters receive completes the information. This happens during phase S of the interphase, the period that alternates with the mitosis in the cellular cycle and in which the cell among other things is prepared for dividirse.After the duplication of the DNA, each chromosome will consist of two identical copies of the same DNA fiber, called cromátidas sisters, united to each other by a region of the called chromosome centrómero. Each cromátida sister does not consider in that situation a chromosome in itself, but part of a chromosome that provisionally consists of two cromátidas ones.

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INFORRRRRRRRR - 15/06/2009 18:48:52 said:

Mitosis is the process that facilitates the equal partitioning of replicated chromosomes into two identical groups. Before partitioning can occur, the chromosomes must become aligned so that the separation process can occur in an orderly fashion. The alignment of replicated chromosomes and their separation into two groups is a process that can be observed in virtually all eukaryotic cells.

Both the alignment and separation processes are the consequence of the chromosomes interacting with filamentous proteinaceous structures, known as microtubules. The microtubules become organized into a biconical array known as a spindle, which forms early in mitosis, and then disassembles as mitosis nears completion. Mitotic spindles are visible in living cells with the polarizing light microscope. Some of the spindle microtubules become attached to the chromosomes at sites known as kinetochores. The kinetochores cannot be seen with the light microscope, but they reside near the place on the chromosome known as its centromere, which can be observed with the light microscope. There are two kinetochores on each replicated chromosome (one on each chromatid), and when the replicated chromosome splits apart at its centromere at the onset of anaphase, each daughter chromosome possesses one centromere and one kinetochore. The linkages between kinetochores and microtubules are thought to be central in controlling both the positioning of the replicated chromosome at the central portion of the spindle during the alignment phase, and in moving the daughter chromosomes apart after they split at their centromeres. The separation of daughter cells from each other is a process known as cytokinesis, and is separate from mitosis. In cytokinesis, animal and plant cells differ considerably from each other. These differences are the consequence of having or not having a cell wall. Cytokinesis in fungi reveals some similarities with plant cells, and exhibits other features unique to the group.

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chaparrita_7 - 15/06/2009 05:29:01 said:

DNAAAAAAAA

Lack of the yeast Rrm3p DNA helicase causes replication defects at multiple sites within ribosomal DNA (rDNA), includingat the replication fork barrier (RFB). These defects were unaltered in rrm3 sir2 cells. When the RFB binding Fob1p was deleted, rrm3-generated defects at the RFB were eliminated, but defects at other rDNA sites were not affected. Thus, specific protein–DNA complexes make replication Rrm3p-dependent. Because rrm3-induced increases in recombination and cell cycle length were only partially suppressed in rrm3 fob1 cells, which still required checkpoint and fork restart activities for viability, non-RFB rrm3-induced defects contribute to rDNA fragility and genome instability.

La carencia de la levadura Rrm3p el ADN helicase causa defectos de réplica en múltiples sitios dentro del ADN ribosomal (rDNA), includingat la barrera de tenedor de réplica (RFB). Estos defectos eran inalterados en rrm3 sir2 células. Cuando el RFB que ata Fob1p fue suprimido, rrm3-generado los defectos en el RFB fueron eliminados, pero los defectos en otros sitios de rDNA no fueron afectados. Así, complejos de ADN de proteína específicos hacen el Rrm3p-dependiente de réplica. Como los aumentos rrm3-inducidos de la nueva combinación y la longitud de ciclo de célula sólo parcialmente fueron suprimidos en rrm3 fob1 células, que todavía requerían el punto de control y las actividades de nuevo principio de tenedor para la viabilidad, non-RFB defectos rrm3-inducidos contribuyen a la fragilidad rDNA y la inestabilidad genome.

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chaparrita_7 - 15/06/2009 04:55:05 said:

ya que G1, S Y G2 son etapas de preparacion para la posterior division celular mitotica!!!! y la citosinesis o citodieresis es el final de la TELOFASE, ya que la citodieresis se produce por el estiramiento de los filamentos del huso mitotico!!!!!! osea, si no hay mitosis no habria PROFASE, METAFASE, ANAFASE NI TELOFASE, Y SI NO AY TELOFASE, NO DEBERIA OCURRIR UNA DIVISION CELULAR O CITODIERESIS!!!!...


Since G1, S And G2 are stages of preparation for the later(posterior) cellular division mitotica!!!! And the citosinesis or citodieresis is the end of the TELOFASE, since the citodieresis takes place(is produced) for the stretching of the filaments of the spindle mitotico!!!!!! Bony(osseous), if there is mitosis not habria PROFASE, METAFASE, neither ANAFASE NOR TELOFASE, AND IF NOT SIGH TELOFASE, A CELLULAR DIVISION OR CITODIERESIS SHOULD NOT HAPPEN!!!!...

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chaparrita_7 - 15/06/2009 04:54:29 said:

RESPUESTA ### 2


ese proceso que descrbiste en la celula se llama etapa G0
ocurre cuando una celula sale del ciclo celular, es imposible que las celulas se separen sin tener mitosis ya que la membrana nuclear no se podria desintregar, la cromatina no se podria condensar para convertirse en cromosomoas y estos no podrian migrar hacia sus respectivos polos, asi que es casi imposible obtener dos celulas saltando el paso mas importante de esta separacion, recordemos que en la fase S el material genetico se duplica y en g1 seprepara para la division pero en ningun momento se comienza una separacion celular, sin mitosis es imposible

las neuronas comunmente realizan esta etapa G0 por eso muchas veces hablamos de muerte nuronal ya que salen del ciclo celular
espero que te sirva mi respuesta


This process that descrbiste in the cell is called a stage G0 happens when a cell goes out of the cellular cycle, it is impossible that the cells separate without having mitosis since the nuclear membrane not podria desintregar, the cromatina not podria to condense to turn in cromosomoas and these not podrian to migrate towards his(her,your) respective poles, this way that is almost impossible to obtain two cells jumping the step mas important of this separation, let's remember that in the phase S the genetic material doubles and in g1 seprepara for the division but never a cellular separation is begun, without mitosis is impossible
The neurons commonly realize this stage G0 because of it often we speak about death nuronal since they go out of the cellular cycle I hope that it(he,she) serves my response you

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