What's the difference between micromere and micrometre?
Micromere
Definition:
(n.) One of the smaller cells, or blastomeres, resulting from the complete segmentation of a telolecithal ovum.
Example Sentences:
(1) In Strongylocentrotus droebachiensis, a micromere-specific protein of 133 K molecular weight (MW) was identified.
(2) The most extensively studied example is the specification of the mesodermal stem cell in Lymnaea and Patella, which occurs between 5th and 6th cleavage through an interaction between one macromere and a large number of micromeres.
(3) From the early beginning of the 32-cell stage, all four macromeres introdude far into the interior and tough the centrally radiating cells of the first quartet of micromeres.
(4) We suggest that the fibrillar meshwork is needed for macromere elongation toward the micromeres and that the basal lamina-like layer is involved in the determination process itself.
(5) Ilyanassa obsoleta larvae have two calcium carbonate-containing organs, shell and statocyst, which are derived from five micromere cells (2a, 2c, 2d, 3c, 3d).
(6) During the fifth cleavage interval in equally cleaving embryos, one of the vegetal macromeres makes exclusive contacts with the animal micromeres, and this macromere will give rise to the mesodermal precursor cell at the next division, thereby identifying the dorsal quadrant.
(7) Mesomere-mesomeres (which divide equally) and macromere-micromeres (which divide unequally) are compared in terms of their asters (both mitotic and so-called interphase asters), spindle apparatus, and contractile ring.
(8) Caulobothrium longicolle (Linton, 1890) and Phyllobothrium gracile (Weld, 1855) (Cestoda: Tetraphyllidea, Phyllobothriidae) have the same embryonic development with the following characteristic data: --a small number of vitelline cells (2 or 3) pass with the zygote in the ootype;--a non operculate thin egg-shell;--the entire and equal zyhote cleavage following by unequal divisions leading to the formation of four blastomere types (Macromeres, secondary Macromere, Mesomeres and Micromeres);--the differentiation of two syncytial embryonic envelopes during the preoncospheral phase.
(9) To examine competence in this system we have exposed cultured sea urchin micromeres to an inducing medium containing horse serum for various periods of time and have identified a period when micromeres are competent to respond to serum and form spicules.
(10) In Arbacia punctulata, four high molecular weight (HMW) proteins are detected on the surface of isolated micromeres--but not on mesomere-macromere fractions.
(11) Quantitation of immunofluorescence and three-dimensional reconstruction techniques demonstrate that micromere centrosomes differ from macromere centrosomes in two respects: (1) micromere spindle poles contain less centrosomal material than macromere poles, and (2) micromere centrosomes undergo a specific filiform elongation during late anaphase and telophase.
(12) A complementary DNA (cDNA) library was generated from cytoplasmic polyadenylated RNA isolated from differentiated micromere cultures of Strongylocentrotus purpuratus.
(13) Lineages of the first quartet micromeres were followed using Lucifer Yellow dextran as a tracer.
(14) The role of unequal cleavage in echinoid micromere determination was investigated by equalizing the fourth and fifth cleavages with brief surfactant treatment.
(15) We show that in sea urchin embryos, the daughter cells of the small micromeres become part of the coelomic sacs, in contrast to the long-held view that these sacs are purely of macromere origin.
(16) A procedure is described for large-scale isolation of micromeres from 16-cell stage sea urchin embryos.
(17) A method was developed for isolating large quantities of micromeres from the 16-cell stage of the sea urchin, and measurements were made of their ability to incorporate C(14)-L-valine into protein as compared with that of a mixed suspension of micromeres, mesomeres, and macromeres.
(18) Using this method, we fractionated the three different blastomere types of the 16-cell sea urchin embryo, the micromeres, mesomeres, and macromeres, achieving 96, 94, and 96% mean purities, respectively.
(19) Spicule formation of micromere-derived cells was enhanced by anti-FAPS.
(20) pHPSMC mRNA was detected in micromeres in vitro after 48 h of culture, but it was not found in blastomeres immediately after isolation.
Micrometre
Definition:
Example Sentences:
(1) These particles of less than 2.5 micrometres in diameter can penetrate the lungs and pass into the bloodstream and have been linked to increased rates of chronic bronchitis, lung cancer and heart disease.
(2) The volume of cytoplasm occupied by electron-dense cored vesicles was significantly increased, whilst their density per square micrometre of cytoplasm was decreased during hypoxia.
(3) With regard to the disappearance of osteocytes in the bone cortex at the cut surfaces of bones, micrometric findings revealed that there was a great difference between the scalded and the unscalded side in every group except in the group where a Gigli's saw was used.
(4) In addition to visual examination and photographic evaluation of restorations, the micrometric assessment of replica photographs from the scanning electron microscope may render clinical trials of amalgam alloys measurable and less subjective.
(5) Our studies reveal the presence of an intact mesothelial lining of the arachnoid mater, including its villus-like projections and herniations into the dural sinus and its lacunae, adjacent cells being joined by tight junctions; in addition we have observed for the first time that many lining cells in the region of the superior sagittal sinus are characterized by unit membrane-bound, electron-optically empty giant vacuoles of several micrometres diameter.
(6) The layer thickness can be controlled and may range between some hundred nanometres and up to a few micrometres.
(7) changed morphology from rods of about 6 to 8 microns long to multicellular filaments (unsheathed trichomes) up to many hundreds of micrometres long with the addition of glycine or certain D-amino acids to the growth medium.
(8) In this context, microscopic and spectroscopic techniques, devised for problem solving, are being applied to frequently encountered sub-micrometre particulates which are 'unstable' with respect to methods of sample preparation and storage used routinely for particulates prior to analysis.
(9) Fifteen micrometres radiolabelled dextran spheres were injected into three adult monkeys; after measuring reference flows, the animals were killed and biopsies were taken from skin and 15 oral mucosal regions.
(10) (1) Formation of extensive contact zones (with a linear size of several micrometres) with tight intermembrane adhesion (more than 30% of the membrane contours in adhesive zones were separated by an apparent distance lower than 500 A) was essentially completed within less than one minute.
(11) In the past, researchers quantified spine density as the number of visible spines per estimated micrometre of dendrite.
(12) Morphological changes in the epidermis caused by aging and sun exposure were studied by light microscopy and micrometric techniques.
(13) On cooling the dispersion from the isotropic phase, we have observed the formation of long (of the order of hundreds of micrometres), thin (0.2-2 microns) filaments, which fluctuate strongly.
(14) The number of cell nuclei and the thickness of the media and intima were determined micrometrically along 8 radii of each cross-section.
(15) The device measures the threshold pressure required to produce bubbles from the micropipette submerged in a liquid and displays the tip inner diameter in micrometres.
(16) The incidence of occult nodal metastases was highest in patients with deeply invasive and micrometrically thick primary tumors.
(17) Methods were tested in four subjects using a micrometric procedure of Doppler probe displacement providing instantaneous real time velocity profiles.
(18) Perijunctional membrane had a Na+ current density 5- to 10-fold greater than the density several hundred micrometres from the end-plate.
(19) The scale of organization is a critical factor in the characterization of biosilicification processes, and order at the nanometre, micrometre and macroscopic levels is described.
(20) The authors report the case of a patient suffering from collagen colitis in whom the administration of omeprazole achieved the rapid and total abolition of the clinical signs and a significant reduction of the collagen band (measurements determined over 10 cryptic spaces using a graduated micrometric ocular microscope).