Nucleus. Each syllable has a vocalic nucleus. In Tableau 1, the optimal candidate a. fulfills all constraints. This is because the information delivered by VI is sufficient to deliver the phonological content of the functional morpheme. Candidate b. has a voiced consonant and violates IDENT(F) and candidate c. violates ONSET and NOCODA. Since all constraints are fulfilled in the optimal candidate, it is not possible to establish a ranking among them. IDENT(F)root is not active here because the word has no lexical root.
Nucleus. The nucleus is elongate, slightly curved, and circular in cross-section. At its anterior extremity, it forms a point deeply wedged in the acrosome (Figs 2H & 4H). The length of this nuclear projection, which is surrounded by the subacrosomal cone, is approximately 2.5 µm. Anterior to the nuclear tip and within the subacrosomal cone there is an elongate, narrow chamber with a membrane of its own, the epinuclear lucent-zone, filled with an electron- lucent substance (Figs 2D, H & 4D, H). Small rounded shoulders (Figs 2B, H & 4H) xxxx the transition from the tapered apical portion to the cylindrical region. The posterior pole of the nucleus is marked by a shallow conical depression, the nuclear fossa, for receiving the centriolar apparatus (Figs 3A, H, I & 5A, I). The main body of the nucleus appear homogeneous and completely electron-dense, but in some instances there are small, electron-lucent channels penetrating it, the lacunae (Figs 2G & 4G). Along the nuclear point the boundary between the nuclear contents and the nuclear envelope is irregular, containing evenly dispersed, fine granular material (Figs 2B, E–F, H & 4B, E–F, H). In T. semitaeniatus, the nuclear base abruptally increases in width, producing a conspicuous, rounded bulge (Fig. 3A), which is absent in T. torquatus (Figs 4H & 5I).
Nucleus. The nucleus is elongated and composed of highly condensed, electron-dense chromatin. In transverse section, the nucleus is circular throughout (Fig. 2F & G). At its anterior extremity, the nucleus forms a point within the acrosome complex, the nuclear rostrum. The transition from the nuclear rostrum to the cylindrical portion of the nucleus is abrupt and marked by rounded nuclear shoulders (Fig. 2 and Fig. 3). Basally the nucleus terminates with a shallow concave depression, the nuclear fossa, which houses the anterior half of the proximal centriole and dense pericentriolar material (Fig. 2 and Fig. 3).
Nucleus. The central part of an atom consisting of protons and neutrons. nuclide A species of atom characterised by its atomic number and mass number, e.g. 8O, 11Na, 53I. Refers to all known nuclides, stable (279) and unstable (about 5000). parent nuclide A radionuclide that upon radioactive decay yields a specific daughter nuclide. periodic table An arrangement of chemical elements in order of increasing atomic number. Elements of similar properties are placed one under the other, yielding groups or families of elements. There is a general similarity of chemical behaviour within each group. personnel monitoring The measurement of radiation exposure of individuals using dosimeters or bioassay. photon A quantum (or packet) of energy emitted in the form of electromagnetic radiation. Its energy is equal to h , where h is Xxxxxx'x constant (6.626 x 10-34 J-s), and is the frequency of the radiation (s-1). pico- A prefix that divides a basic unit by one trillion. pocket dosimeter A small radiation detection instrument that indicates radiation exposure directly. May use solid state semi-conductor detector, or gaseous GM or ionization chamber. positron A positively charged electron emitted by certain radionuclides. It is unstable, and in combination with an electron it undergoes annihilation to form annihilation radiation. proportional counter A radiation detection instrument with a gas-filled detector in which the pulse size is proportional to the incident energy. Can be used as a sensitive contamination monitor for large areas. protective barriers Walls and barriers of material such as lead, concrete, plaster, lead acrylic or lead glass. Used to reduce radiation exposure by shielding. proton An elementary nuclear particle with a positive electric charge located in the nucleus of an atom. (See atomic number) quality assurance A comprehensive set of actions or procedures to ensure that all aspects of a service will perform satisfactorily. quality control A set of tests routinely performed on a piece of equipment to confirm its satisfactory performance. rad The old unit of absorbed dose . 1 rad = 100 ergs per gram. 1 rad 10-2 Gy = 10 mGy. radiation trefoil An officially prescribed warning symbol (a magenta trefoil on a yellow background) that must be on or near radiation sources. radiation weighting factor A multiplying factor used to weight the absorbed dose from a given type of radiation to obtain the equivalent dose. Radiation weighting factors range from 1 for elec...
Nucleus. Below the nuclear envelope, a nuclear space that probably results from the condensation of chromatin process is seen (Fig. 1B, D & E). The nucleus is circular in transverse section (Fig. 1G) and conical in longitudinal section (Fig. 1B). The anterior portion of the nucleus is enveloped by the acrosome complex and gradually tapers (nuclear shoulders absent) to a point within the subacrosomal cone (Fig. 1E & F). The chromatin is highly condensed and electron-dense. Despite the high degree of condensation, several small electron-lucent nuclear lacunae and inclusions are seen (Fig. 1G & H).
Nucleus. The elongated nucleus consists of highly condensed, electron-dense chromatin. In transverse section, the nucleus is circular throughout (Fig. 2, Fig. 6, Fig. 7 and Fig. 8). The nucleus tapers anteriorly to form a slender cone, the nuclear rostrum, within the acrosome complex. The nuclear rostrum is distinguished from the main part of the cylindrical nucleus by abrupt and rounded nuclear shoulders (Fig. 2, Fig. 6, Fig. 7 and Fig. 8). Basally, the nucleus ends with a shallow concave depression, the nuclear fossa, which houses the anterior half of the proximal centriole and dense pericentriolar material (Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. 8).