If a broader Atlantic community is to be formed -- and my own judgment is that it lies within the realm of both our needs and our capacity -- a ready nucleus of machinery is at hand in the NATO alliance.

Though it did not become known to the writer for some time, a nucleus group had sprung up within the class.

All true algae therefore have a nucleus enclosed within a membrane and plastids bound in one or more membranes.

Isotopes were then explained as elements with the same number of protons, but different numbers of neutrons within the nucleus.

The cytoplasm is the gel-like substance residing within the cell membrane holding all the cell's internal sub-structures ( called organelles ), outside the nucleus.

All the contents of the cells of prokaryote organisms ( which lack a cell nucleus ) are contained within the cytoplasm.

The main structures making up the nucleus are the nuclear envelope, a double membrane that encloses the entire organelle and unifies its contents from the cellular cytoplasm, and the nucleoskeleton ( which includes nuclear lamina ), a meshwork within the nucleus that adds mechanical support, much like the cytoskeleton, which supports the cell as a whole.

The viscous liquid within it is called nucleoplasm, and is similar in composition to the cytosol found outside the nucleus.

The contents of a eukaryotic cell within the cell membrane, excluding the cell nucleus and other organelles ( e. g. mitochondria, plastides, lumen of ER etc.

The amount of sulfur implied by the quantities of these compounds was much greater than the amount that would be expected in a small cometary nucleus, showing that material from within Jupiter was being revealed.

The layout of the genome within the nucleus is not random-specific regions of the genome have a tendency to be found in certain spaces.

# Simple and concise definition: Chromatin is DNA plus the proteins ( and RNA ) that package DNA within the cell nucleus.

This protein is normally found within the nucleus but in IBM is found in the cytoplasm of the cell.

The first stage of prophase I is the leptotene stage, also known as leptonema, from Greek words meaning " thin threads ". In this stage of prophase I, individual chromosomes — each consisting of two sister chromatids — change from the diffuse state they exist in during the cell's period of growth and gene expression, and condense into visible strands within the nucleus.

However, near a refractive boundary ( say a nucleus within the cytoplasm ), the difference between the ordinary and the extraordinary beam will generate a relief in the image.

For example, animals undergo an " open " mitosis, where the nuclear envelope breaks down before the chromosomes separate, while fungi such as Aspergillus nidulans and Saccharomyces cerevisiae ( yeast ) undergo a " closed " mitosis, where chromosomes divide within an intact cell nucleus.

They are also found on the terminal axons of primary afferents within laminae I and II ( substantia gelatinosa ) of the spinal cord and in the spinal nucleus of the trigeminal nerve.

A hydrogen nucleus is a single proton, so simultaneous nuclear interactions, which would occur within a heavier nucleus, don't need to be considered for the detection experiment.

In this case, the energy levels and spin states within the target nucleus have to be taken into account to estimate the probability for an interaction.

In general the interaction probability increases with the number of neutrons and protons within a nucleus.

Nucleic acids were named for their initial discovery within the nucleus, and for the presence of phosphate groups ( related to phosphoric acid ).

Although first discovered within the nucleus of eukaryotic cells, nucleic acids are now known to be found in all life forms as well as some nonliving entities, including within bacteria, archaea, mitochondria, chloroplasts, viruses and viroids.

The cell nucleus was discovered by Robert Brown in 1831.

Cloning involves the removal of the nucleus from one cell and its placement in an unfertilized egg cell whose nucleus has either been deactivated or removed.

After a few divisions, the egg cell is placed into a uterus where it is allowed to develop into a fetus that is genetically identical to the donor of the original nucleus.

Distinct types of membranes also create intracellular organelles: endosome ; smooth and rough endoplasmic reticulum ; sarcoplasmic reticulum ; Golgi apparatus ; lysosome ; mitochondrion ( inner and outer membranes ); nucleus ( inner and outer membranes ); peroxisome ; vacuole ; cytoplasmic granules ; cell vesicles ( phagosome, autophagosome, clathrin-coated vesicles, COPI-coated and COPII-coated vesicles ) and secretory vesicles ( including synaptosome, acrosomes, melanosomes, and chromaffin granules ).

Within the cells of eukaryote organisms the contents of the cell nucleus are separated from the cytoplasm, and are then called the nucleoplasm.

HeLa cells stained for the cell nucleus DNA with the Blue Hoechst stain | Hoechst dye.

In cell biology, the nucleus ( pl.

The function of the nucleus is to maintain the integrity of these genes and to control the activities of the cell by regulating gene expression — the nucleus is, therefore, the control center of the cell.

In 1838, Matthias Schleiden proposed that the nucleus plays a role in generating cells, thus he introduced the name " Cytoblast " ( cell builder ).

In mammalian cells, the average diameter of the nucleus is approximately 6 micrometers ( μm ), which occupies about 10 % of the total cell volume.

* Reproduction-Made possible by the combination of sperm made in the testiculi ( contained in some male cells ' nuclei ) and the egg made in the ovary ( contained in the nucleus of a female cell ).

It also contains ribosomes ; however most of its proteins are encoded by genes contained in the host cell nucleus, with the protein products transported to the chloroplast.

This allows the very long DNA molecules to fit into the cell nucleus.

the lay ministry is a means to recruit like-minded people who will strengthen the social class nucleus of the congregation.

Atomic models will consist of a single nucleus that may be surrounded by one or more bound electrons.

When more electrons are added to a single atom, the additional electrons tend to more evenly fill in a volume of space around the nucleus so that the resulting collection ( sometimes termed the atom ’ s “ electron cloud ” ) tends toward a generally spherical zone of probability describing where the atom ’ s electrons will be found.

Just which of the multitudinous substances present in a nucleus will constitute a part of the extracted material will depend in part on the technique each researcher uses.

On the most basic level, electronegativity is determined by factors like the nuclear charge ( the more protons an atom has, the more " pull " it will have on negative electrons ) and the number / location of other electrons present in the atomic shells ( the more electrons an atom has, the farther from the nucleus the valence electrons will be, and as a result the less positive charge they will experience — both because of their increased distance from the nucleus, and because the other electrons in the lower energy core orbitals will act to shield the valence electrons from the positively charged nucleus ).

The nucleus in a cell for example will show up darkly against the surrounding cytoplasm.

: When a material is put in a magnetic field, the electrons circling the nucleus will experience, in addition to their Coulomb attraction to the nucleus, a Lorentz force from the magnetic field.

This excited state is unfavourable and the compound nucleus will almost instantaneously de-excite ( transmutate ) into a more stable configuration through the emission of a prompt particle and one or more characteristic prompt gamma photons.

Any material with an NLS will be taken up by importins to the nucleus.

If no additional energy is supplied by any other mechanism, the nucleus will not fission, but will merely absorb the neutron, as happens when U-238 absorbs slow and even some fraction of fast neutrons, to become U-239.