What's the difference between amorphous and semicrystalline?
Amorphous
Definition:
(a.) Having no determinate form; of irregular; shapeless.
(a.) Without crystallization in the ultimate texture of a solid substance; uncrystallized.
(a.) Of no particular kind or character; anomalous.
Example Sentences:
(1) Type II pigment is extremely electron-opaque after staining with heavy metals to the extent that they appear practically amorphous.
(2) In order for a stone to form, the following conditions would seem to be necessary; transient supersaturation of the saliva in Ca++ and PO4--, a pH greater than normal, intracellular precepitation of amorphous tricalcium phosphate which is transformed into crystalline hydroxyapatite and, then, the fixation of crystals on a "matrix" such as desquamated cells, fibrils and collagens.
(3) Whether or not there were carriers for either amorphous or hypomorphous alleles of the SORD locus in the population studied could not be defined in terms of enzymatic activity levels.
(4) How can a prize that is supposed to be for one person be given to an amorphous supranational organisation?
(5) Within 18-24 h asteroid bodies consisting of an amorphous centre with fine radiating needle crystals were seen.
(6) The paraventricular organ displayed strong amorphous activity accompanied by the intense reaction in the nucleus of the paraventricular organ.
(7) The most probable result of in vivi SnF2 application on sound enamel is the formation of a fluoridated hydroxyapatite together wity stannous complexes and amorphous CaF2.
(8) Scanning electron microscopy was used to examine canine tracheal cartilage and to determine the relationship between the fibrous and amorphous matrix in this tissue.
(9) Immunocytochemical experiments showed that the GP Ib-IX complex and actin-binding protein were associated with the amorphous layer.
(10) The basal lamina first appeared in the form of amorphous deposits and eventually thickened and became continuous.
(11) In addition to exposing the underlying filamentous substructure of the matrix, protease treatment also revealed large, straight fiber bundles and globules of amorphous material suspended in the filamentous web.
(12) In the intraocularly injected rabbits the earliest changes observed in retinal ganglion cells were the severe reduction in microtubule number and the presence of an amorphous material.
(13) Examination of the contents of mouse gallbladders presents views of layered structures and surrounding amorphous material.
(14) Routine electron microscopic examination on the same portion where SPLS were confirmed by PAM electron microscopy revealed amorphous, partially fibrous structures.
(15) Light microscopy revealed deposits of amorphous, eosinophilic material in the pelvis and proximal portion of upper ureter, however tumor cells were not found.
(16) The fibrous component stained with lead citrate while the amorphous stained with the silver porphyrin.
(17) X-ray and infrared analysis of systems suggested the presence of an amorphous form of hydroflumethiazide in coprecipitate systems.
(18) The effects of amorphous silica (Aerosil) and of aluminium hydroxide on anti-DNP IgE antibody production were studied in Swiss mice preimmunized with Ascaris protein and then challenged 7 days later with DNP-ASC.
(19) A granular, amorphous, collagen-free, electron-dense layer was routinely observed between implant and tissue.
(20) According to their periodicity, their banding pattern, their association with polyanionic matrix components and their sensitivity towards glycosaminoglycan-degrading enzymes we could distinguish (1) sheets of amorphous non-banded material consisting of irregularly arranged filaments and containing dermatan sulfate-rich proteoglycans (type I structures), (2) sheets of long-spacing fibrils consisting of parallel orientated filaments and containing chondroitin sulfate-rich proteoglycans (= zebra bodies; type II structures), and (3) fibrillar structures with a complex banding pattern different from that of native collagen fibrils (type III structures).
Semicrystalline
Definition:
(a.) Half crystalline; -- said of certain cruptive rocks composed partly of crystalline, partly of amorphous matter.
Example Sentences:
(1) Examples are drawn from semicrystalline polymers with flexible chains, liquid-crystalline polymers composed of rigid macromolecules, and amorphous polymers.
(2) This paper emphasizes the importance of controlling the crystalline-amorphous microstructure for the antithrombogenicity of polymer surfaces with a semicrystalline microstructure.
(3) Images of dense aggregates have a semicrystalline order with the individual polymers adopting simple periodic structures.
(4) This complex showed the ordinary transition, except that it yielded a semicrystalline B-form at 66% r.h., suggesting good side-to-side interactions of the material due to some number of cross-bridges of tetramine.
(5) Selective area diffraction showed the existence of semicrystalline domains.
(6) The swelling limit or equilibrium swelling of semicrystalline or cross-linked polymers and of their gels upon immersion in liquids has been investigated extensively.
(7) The following interpretation for the applicability of second-order kinetics to the swelling of semicrystalline polymers, such as gelatin and cellulose, is given.
(8) Essential role of crystalline-amorphous microstructured surface in thromboresistant property of semicrystalline segmented copolymer is also discussed in detail.
(9) This indicates that lipids next to the receptor protein are not completely immobilized in spite of the semicrystalline organization of the proteins in the postsynaptic region.
(10) Since the amount of sorbed-O2 is a function of the chemical nature of the polymer, the type of crystallinity (polymorphism of semicrystalline polymers), the crystalline-amorphous ratio, and so on, a careful study of T1 relaxation as a function of the temperature can define optimal conditions for T1 contrast.
(11) Shielding of this peptide bond may therefore be due to protein-protein interactions in the semicrystalline state of the vanadate-bound Ca2+-ATPase in membranous form.
(12) Electron-microscopically, semicrystalline inclusions were seen in the mitochondria of the hepatocytes; such inclusions have been reported in several conditions, including erythropoietic protoporphyria and porphyria cutanea tarda, and in control subjects.
(13) The experimental results can be interpreted without assuming the major part of water phase in striated muscle to be ice-like or semicrystalline.
(14) The semicrystalline nature of the polymer is responsible for the changes in crystallinity.
(15) Semicrystalline swollen polymeric networks are prime candidates for biomedical applications.
(16) Techniques have also been developed for the preparation of deformable pseudocomposites consisting of layers of swollen semicrystalline and amorphous polymer.
(17) A mechanism for failure was presented which assumes that these sutures are bundles of oriented, semicrystalline microfibrils.
(18) When long hard segments were present, essentially monophasic, semicrystalline polymers were obtained, with PLA blocks melting around 130 degrees C. Polymers containing longer soft segments (PEO 6000) exhibited a two-phase matrix, with both components being able to crystallize.
(19) Since the positronium formation rate in ice is considerably higher than it is in water, there should be a comparable increase in the positronium formation rate in muscle tissue if recent speculation that cellular water is ordered in a semicrystalline icelike state is correct.
(20) The currently available theory is found to be in quite good general agreement with a large number of conformational and mixing properties of polymers at interfaces, in semicrystalline polymers, in alkane crystals, in stationary phases used in reversed-phase liquid chromatography, and in amphiphilic aggregates including bilayer membranes and micelles.