(n.) The loadstone; a species of iron ore (the ferrosoferric or magnetic ore, Fe3O4) which has the property of attracting iron and some of its ores, and, when freely suspended, of pointing to the poles; -- called also natural magnet.
(n.) A bar or mass of steel or iron to which the peculiar properties of the loadstone have been imparted; -- called, in distinction from the loadstone, an artificial magnet.
Example Sentences:
(1) By presenting the case history of a man who successively developed facial and trigeminal neural dysfunction after Mohs chemosurgery of a PCSCC, this paper documents histologically the occurrence of such neural invasion, and illustrates the utility of gadolinium-enhanced magnetic resonance scanning in patient management.
(2) The tumors were identified by magnetic resonance (MR) imaging.
(3) Twenty patients with non-small cell bronchogenic carcinoma were prospectively studied for intrathoracic lymphadenopathy using computed tomography (CT) and magnetic resonance imaging (MRI).
(4) The role of magnetic resonance imaging is also discussed, as is the pathophysiology, management, and prognosis in the elderly patient.
(5) An innovative magnetic resonance imaging technique was applied to the measurement of blood flow in the abdominal aorta.
(6) Sequelae of chemo- and radiotherapy were only depicted by magnetic resonance imaging.
(7) Magnetic polyethyleneimine (PEI) microcapsules have been developed for trapping electrophilic intermediates in the gastrointestinal (GI) tract.
(8) Our data support the hypothesis that evoked and epileptiform magnetic fields result from intradendritic currents oriented perpendicular to the cortical surface.
(9) We conclude that exposure for 20 min to a 1.5-T static magnetic field does not alter body and skin temperatures in man.
(10) Magnetic resonance imaging of the spinal cord clearly demonstrated the entire lesion.
(11) Right ventricular volumes were determined in 12 patients with different levels of right and left ventricular function by magnetic resonance imaging (MRI) using an ECG gated multisection technique in planes perpendicular to the diastolic position of the interventricular septum.
(12) In April 1986, magnetic resonance imaging (MRI) of the thorax and shoulder girdle was presented to the 99th Annual Meeting of the American Association of Anatomists.
(13) In addition, a 31P nuclear magnetic resonance (NMR) technique was applied to investigate the in vivo energy metabolism of the graft.
(14) Line broadening detected in several of the high-field nuclear magnetic resonance spectra was attributed to cis-trans isomerization.
(15) The correlation of posterior intervertebral (facet) joint tropism (asymmetry), degenerative facet disease, and intervertebral disc disease was reviewed in a retrospective study of magnetic resonance images of the lumbar spine from 100 patients with complaints of low back pain and sciatica.
(16) In this critical review of human in vivo nuclear magnetic resonance (NMR) spectroscopy, the questions of which chemical species can be detected and with what sensitivity, their biochemical significance, and their potential clinical value are addressed.
(17) The location of the internal trans and cis isoprene units in ficaprenol-11 isolated from Ficus elastica was determined by 13C nuclear magnetic resonance.
(18) Using sterile conditions, antibodies to G were incubated with a suspension of transformed cells at 4 degrees C, unbound antibodies were then removed, and the cells were incubated with the immunoabsorbent (3 micron magnetic beads; J. Ugelstad et al.
(19) The EMD was miniaturized by using rare earth magnets in the construction of both external transmitter and internal receiver.
(20) We present three patients in whom the diagnosis of intranasal meningoencephalocele was made by magnetic resonance imaging.
Magnetite
Definition:
(n.) An oxide of iron (Fe3O4) occurring in isometric crystals, also massive, of a black color and metallic luster. It is readily attracted by a magnet and sometimes possesses polarity, being then called loadstone. It is an important iron ore. Called also magnetic iron.
Example Sentences:
(1) Silicone coated magnetite of nanometeric size was incorporated in the drug bearing microspheres.
(2) However, two developments during the past decade have changed this perception dramatically, the first being the discovery that many organisms, including humans, biochemically precipitate the ferrimagnetic mineral magnetite (Fe3O4).
(3) The results of this experiment show that the "biological magnetite" is distinctly different from hemosiderin and has characteristic properties when subjected to a magnetic field.
(4) Viable spermatozoa were isolated from magnetite-complexed spermatozoa, but the motility of the isolated spermatozoa deteriorated rapidly during the subsequent capacitation period.
(5) Magnetite (Fe3O4) particles 0.1-0.5 microns in diameter doped with either 99mTc or 111In have been prepared and characterized by electron microscopy and Mössbauer spectroscopy.
(6) The water relaxation ability of ferromagnetic, albumin-coated magnetite (Fe3O4) particles has been investigated.
(7) So far, identification of magnetite in tissue has been mainly based on magnetometry.
(8) By conjugating a monoclonal IgM antibody of CD8-specificity to magnetite-containing polymer particles, we have developed a rapid and simple one-step procedure for positive selection of T8 cells.
(9) A magnetic immobilized lactase has been prepared using magnetite as the magnetic material.
(10) Hydrolytic polymerization of iron(III) occurs in many reactions in vivo, for example, the formation of bacterial magnetite in magnetotactic organisms, biomineralization of iron and the synthesis of the metallic core of the iron-storage protein ferritin.
(11) X-ray diffraction patterns show that the mature denticles of three extant chiton species are composed of the mineral lepidocrocite and an apatite mineral, probably francolite, in addition to magnetite.
(12) The latter structures consist of nanometer-sized magnetite (Fe3O4) cores which are enwrapped by a phospholipid bilayer.
(13) We found significant quantities of single-domain magnetite in connective tissue from the ethmoid region of the skull of adult (4-year-old) sockeye salmon.
(14) The adhesion of cells of Salmonella typhimurium to albite, biotite, felspar, magnetite and quartz was correlated to the presence of fimbriae and degree of hydrophobicity and charge of the bacterial surface.
(15) We suggest that tissue from within the ethmoid region of the skull in pelagic fishes is the only site yet identified where magnetite suitable for use in magnetoreception is concentrated.
(16) This report describes the preparation and characterization of synthetic ferritin-like particles produced by precipitation of magnetite from a mixture of ferrous and ferric ions in the presence of dextran.
(17) The polyvinylamine-magnetite pellicle shielded the external plasma membrane face to proteolysis by papain and pronase.
(18) First, a method to produce a stable condition of hydrostatic pulmonary edema was developed and verified by CT. Second, dose-response curves for coated magnetite preparations were constructed by giving edematous rats varied doses of these preparations and measuring signal intensity changes of various organs by sodium MRI in a 31-cm-bore 1.9-T magnet.
(19) By the smolt stage, the amount of magnetite present in the front of the skull is sufficient to provide the fish with a magnetoreceptor capable of detecting small changes in the intensity of the geomagnetic field.
(20) The carrier consists of human serum albumin microspheres, average of 1 micrometer in diameter, in which a magnetizable material (magnetite) and a prototype drug (doxorubicin) are entrapped.