Word Finder - nucleus

definition

The core, central part of something, around which other elements are assembled.

definition

An initial part or version that will receive additions.

example

This collection will form the nucleus of a new library.

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The massive, positively charged central part of an atom, made up of protons and neutrons.

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A large membrane-enclosed organelle found in eukaryotic cells which contains genetic material.

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A ganglion, cluster of many neuronal bodies where synapsing occurs.

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The central part of a syllable, most commonly a vowel.

Starch exists, in the majority of cases, in the form of grains, which are composed of stratified layers arranged around a nucleus or hilum.

He discovered the nucleus of the cell.

The eggcell or oosphere is a large cell containing a single large nucleus, and in the green plants the rudiments of plastids.

They are more easily seen, when the nucleus is about to undergo mitosis, at the ends of the spindle, where they form the centres towards which the radiating fibres in.

In the spermatozoids of Chara, Vascular Cryptogams, and in those of Cycas, Zamia and Ginkgo, the cilia arise from a centrosome-like body which is found on one side of the nucleus of the spermatozoid mother-cell.

The latter are vacuolated, and contain each a nucleus and several dark granules.

Had his successor been as prudent and able, he might have made a unified Netherlands the nucleus of a mighty middle kingdom, interposing between France and Germany, and a revival of that of the Carolingian Lothaire.

In the egg of these insects a small number of nuclei are formed by the division of the nucleus, and each of these nuclei originates by division the cell-layers of a separate embryo.

In young cells the chromatophores are small, colorless, highly refractive bodies, principally located around the nucleus.

In plants with multinucleate cells, such as Albugo, Peronospora and Vaucheria, it is usually a uninucleate cell differentiated by separation of the nuclei from a multinucleate cell, but in Albugo bliti it is multinucleate, and in Sphaero plea it may contain more than one nucleus.

The two nuclei are successively divided from the egg nucleus in the usual way, but they frequently become absorbed in the peripheral protoplasm instead of being extruded from the egg-cell altogether.

Such condensed nuclei are, in many cases, more readily obtained than the parent nucleus.

Substitution takes place usually in the nucleus and only rarely in the side chain, and according to the conditions of the experiment and the nature of the compound acted upon, one or more nitro groups enter the molecule.

Pigmented cell with resting nucleus.

Oertel thinks that in man we have these two different functions carried on by the one nucleus containing both chromatin orders.

It consists in an unequal number of chromosomes passing over to each of the daughter nuclei, so that one may become hypochromatic, the other hyperchromatic. When this happens the resulting cleavage of the cytoplasm and nucleus is also unequal.

In the earlier accepted notion of direct segmentation, usually known as the schema of Remak, division was described as commencing in the nucleolus, as thereafter spreading to the nucleus, and as ultimately implicating the cell-substance.

The liver cells are seen to contain a large globule of fat which pushes the cell nucleus to one side - giving the signet-ring appearance.

This very likely formed the nucleus of a book which bore the name of that sheik and was much read in the 3rd century from the Flight.

Even the isolated cells of the yeast plant have each one nucleus.

In young asci a similar fusion of two nuclei occurs, and also in basidia, in each case the nucleus of the ascus or of the basidium resulting from the fusion subsequently giving rise by division to the nuclei of the ascospores and basidiospores respectively.

The contents of the antheridium are not set free, but that organ penetrates the oogonium by means of a narrow outgrowth, the fertilizing tube, and a male nucleus then passes over into the single oosphere, which at first multinucleate becomes uninucleate before fertilization.

In the development of the ascus we find two nuclei at the base which fuse together to form the single nucleus of the young ascus.

In these latter cases the reaction may proceed in different directions; thus, with the aromatic hydrocarbons, chlorine in the cold or in the presence of a carrier substitutes in the benzene nucleus, but in the presence of sunlight or on warming, substitution takes place in the side chain.

The nucleus of the county consisted of the lands of Cromarty in the north of the peninsula of the Black Isle.

The analogy of the French epic, the Chanson de Roland, favours the belief that there was some nucleus of fact.

But we have first to consider whether any of the accounts come to us on such evidence that we are bound to consider them as containing a nucleus of truth.

But the original nucleus and parts of the incidents may be the work of a single great poet, and yet other episodes may be of different authorship, wrought into the structure of the poem in later times.

Kirchhoff of Berlin.2 According to Kirchhoff, the Odyssey as we have it is the result of additions made to an original nucleus.

Their territories are in many cases neither compact nor continuous, consisting of a number of villages here and there, with a nucleus of more or less importance round the chief town.

As the great aim of this side of public activity is to secure funds for the maintenance of the state's life and working, the administration which operates for this end is the true nucleus of all national finance.

A special literature of oracles did indeed arise; the divine words were collected and the circumstances which produced them were recorded; and had Delphi become in fact the centre of Greece, as Plato conceived it, here might have been the nucleus of a scripture.

There are three main divisions, Staden, the ancient nucleus of the city, properly confined to Stadholmen (the city island) which divides the stream from Molar into two arms, Norrstrom and Soderstrom; Norrmalm on the north shore of the channel, and Sodermalm on the south.

Its nucleus was a castle, built in 809 by Egbert, one of Charlemagne's counts, against the Danes.

Blom found that on brominating orthoacetamido-acetophenone in presence of water or acetic acid, the bromine goes into the benzene nucleus, whilst in chloroform or sulphuric acid or by use of bromine vapour it goes into the side chain as well.

The may also contain an active galactic nucleus at their center.

These are all regulated from an area of the brain called the suprachiasmatic nucleus, which is in the hypothalamus.

The wall of the nucleus breaks down, and the cytoplasmic spindle-fibres become mixed with those derived from the nuclear network.

The benzene nucleus presents a remarkable case, which must be considered in the formulation of any complete theory of valency.

This is obviously unsymmetrical, consisting of an aliphatic and an aromatic nucleus; Claus explained the formation of the same phthalic acid from the oxidation of either nucleus by supposing that if the aromatic group be oxidized, the aliphatic residue assumes the character of a benzene nucleus.

By reduction, the double linkages become saturated, and compounds result which stand in much about the same relation to the original nucleus as hexamethylene does to benzene.

The fifth compound, on the other hand, does not behave as an unsaturated aliphatic compound, but its deportment is that of a nucleus, many substitution derivatives being capable of synthesis.

This is comparable with the reduction of the benzene nucleus into hexamethylene, a substance of an aliphatic character.

Naphthyridines and naphthinolines result from the condensation of two pryridine and two quinoline nuclei respectively; and quino-quinolines are unsymmetrical naphthyridine nuclei condensed with a benzene nucleus.

The city is built upon the lower slope of the Serra do Ouro Preto, a spur of the Espinhago, deeply cut by ravines and divided into a number of irregular hills, up which the narrow, crooked streets are built and upon which groups of low, old-fashioned houses form each a separate nucleus.

In 1652 a number of people in Westmorland and north Lancashire who had separated from the common national worship,' came under the influence of Fox, and it was this community (if it can be so called) at Preston Patrick which formed the nucleus of the Quaker church.

The original archduchy, which included Upper Austria, is the nucleus of the Austrian empire, and the oldest possession of the house of Habsburg in its present dominions.

The question whether a corpuscle actually has a material gravitating nucleus is undecided, but there are strong reasons for believing that its mass is entirely due to the electric charge.

It was named Sao Paulo, and has been at once the source whence knowledge and civilization have been diffused through Brazil, and the nucleus of a colony of its manliest and hardiest citizens, which sent out successive swarms of hardy adventurers to people the interior.

The nucleus of the new army he found in the Czech mercenaries, seasoned veterans who readily transferred their services to the best payer.