(v. t.) To make firm, stable, or fast; to set or place permanently; to fasten immovably; to establish; to implant; to secure; to make definite.
(v. t.) To hold steadily; to direct unwaveringly; to fasten, as the eye on an object, the attention on a speaker.
(v. t.) To render (an impression) permanent by treating with such applications as will make it insensible to the action of light.
(v. t.) To put in order; to arrange; to dispose of; to adjust; to set to rights; to set or place in the manner desired or most suitable; hence, to repair; as, to fix the clothes; to fix the furniture of a room.
(v. t.) To line the hearth of (a puddling furnace) with fettling.
(v. i.) To become fixed; to settle or remain permanently; to cease from wandering; to rest.
(v. i.) To become firm, so as to resist volatilization; to cease to flow or be fluid; to congeal; to become hard and malleable, as a metallic substance.
(n.) A position of difficulty or embarassment; predicament; dilemma.
(n.) fettling.
Example Sentences:
(1) The catheter must be meticulously fixed to the skin to avoid its movement.
(2) The binding properties of formalin-fixed amelanotic melanoma cells were not identical to those of endothelial or unfixed target cells.
(3) On the basis of 180 interventions, they describe in detail the use of fibrin glue in myringo- and tympanoplasty for correct fixing of grafts.
(4) Theresa May signals support for UK-EU membership deal Read more Faull’s fix, largely accepted by Britain, also ties the hands of national governments.
(5) According to the finite element analysis, the design bases of fixed restorations applied in the teeth accompanied with the absorption of the alveolar bone were preferred.
(6) At a fixed concentration of nucleotide the effectiveness of elution was proportional to the charge on the eluting molecule.
(7) This suggests that molars do not maintain a fixed relationship to incisors over time, and extreme care must be taken to standardize an experiment to a specific body weight when using this method.
(8) Using an antibody to the nerve growth factor receptor (NGFR), we examined dendritic reticulum cells (DRCs) immunohistochemically in 62 formalin-fixed, paraffin-embedded lymph nodes from patients with reactive follicular hyperplasia or with various types of lymphoma.
(9) Females were killed at various times after the onset of mating or artificial insemination, oviducts were fixed and sectioned serially, and spermatozoa were counted individually as to their location in the oviduct.
(10) Rigidly fixing the pubic symphysis stiffened the model and resulted in principal stress patterns that did not reflect trabecular density or orientations as well as those of the deformable pubic symphysis model.
(11) Using a monoclonal antibody against dopamine and a rabbit antiserum against serotonin, 5-methoxytryptamine or tryptamine, we were able to achieve the simultaneous localization of two amines in glutaraldehyde-fixed sections of rat dorsal raphe nuclei.
(12) In one series of experiments, the animals were not treated before the tissues were conventionally fixed; in another, anesthetized animals were administered horseradish peroxidase 20 min before the tissues were fixed.
(13) Since all human cadaveric tissue is fixed whilst on the skeleton, we may assume that shrinkage of the muscles in such specimens is negligible.
(14) Isolated outer hair cells from the organ of Corti of the guinea pig have been shown to change length in response to a mechanical stimulus in the form of a tone burst at a fixed frequency of 200 Hz (Canlon et al., 1988).
(15) After permeabilization, with attendant partial extraction, the preparation can be fixed, then viewed by either deep-etch replication, or by high-resolution scanning electron microscopy, with structure of interest revealed in deep view.
(16) In contrast, in paraffin as well as in frozen sections of chick oviduct, fixed by immersion or in vapor, PR was exclusively nuclear, including in the absence of progesterone, and the intensity of immunostaining was not modified by progesterone treatment.
(17) Filipin-induced lesions in glutaraldehyde-fixed parasites indicated higher levels of beta-hydroxysterols in the amastigote than in the promastigote plasma membrane, and in the promastigote flagellar membrane than in the body membrane.
(18) Using a silver staining technique (AgNOR technique), we have investigated the nucleolar organizer-associated proteins (NORs) in formalin-fixed paraffin embedded conjunctival specimens of 15 intraepithelial squamous carcinomas, 10 hyperplastic-dysplastic samples and 10 control epithelial fragments; the mean number of intranuclear black dots was determined for each case.
(19) Radiologists may encounter patients with fixed dental prostheses that may produce image distortion on MRI scans of the face and jaw.
(20) A rubber cuff was fixed on the metal cylinder and let an opening of 8 cm, simulating the cervix uteri.
Heterocyst
Definition:
(n.) A cell larger than the others, and of different appearance, occurring in certain algae related to nostoc.
Example Sentences:
(1) We have isolated a mutant Anabaena strain that develops heterocysts mostly at the ends of filaments.
(2) In the third type of mutants, paired proheterocyst differentiation occurred at regular intervals in long filaments and these were defective in their further development into mature heterocysts.
(3) Much of the label entering heterocysts was not available for diffusional exchange back into vegetative cells.
(4) Heterocysts and vegetative cells of the filamentous nitrogen-fixing Anabaena azollae isolated from the apex to the basal leaf cavities of Azolla filiculoides were examined by epifluorescent microscope after fluorochrome staining.
(5) In one, hybridization of heterocyst RNA to a null DNA probe (DNA not transcribed in vegetative cells) revealed that heterocyst-specific transcripts were encoded by 25% of the DNA sense strand, representing approximately 1,000 genes (assuming each to be 1,500 nucleotides in length).
(6) Vegetative cells and young heterocysts in fructose-supplemented medium were significantly larger, were filled with glycogen granules, and had fewer thylakoids.
(7) The quantities of these pigments, however, increase with age of cultures, and by the end of 5 days the majority of heterocysts contain comparatively large amounts.
(8) Transcription and DNA rearrangement of the nifHDK operon both occur late during heterocyst differentiation, about 18 to 24 h after induction, suggesting that the regulation of these events might be coupled.
(9) This study presents the effects of Cr, Pb, Ni and Ag on growth, pigments, protein, DNA, RNA, heterocyst frequency, uptake of NH4+ and NO3-, loss of electrolytes (Na+ and K+), nitrate reductase and glutamine synthetase activities of Nostoc muscorum.
(10) The carbohydrate moieties of the heterocyst wall and spore wall are similar in that the ratio of glucose, mannose, galactose, and xylose is approximately 75:20:3:4 in both walls.
(11) 111:1-61, 1979) (sections II [pleurocapsalean], IV [heterocystous, filamentous, nonbranching], and V [heterocystous, filamentous, branching]) are phylogenetically coherent.
(12) The restriction map of this region of the chromosome showed that the rearrangement was the deletion of a 55-kb DNA element from the heterocyst chromosome.
(13) We have separated vegetative cells from heterocysts in differentiated filaments of Nostoc muscorum, and analyzed their proteins by polyacrylamide-gel electrophoresis.
(14) The remaining 900 to 1,300 transcripts present in the heterocyst appeared to be constitutively produced in both vegetative cells and heterocysts.
(15) Twelve amino acid analogs and related compounds were screened for their ability to induce heterocysts in ammonia-repressed, undifferential filaments of Anabaena variabilis.
(16) The [2Fe-2S] ferredoxin produced in the heterocyst cells of Anabaena 7120 plays a key role in nitrogen fixation, where it serves as an electron acceptor from various sources and an electron donor to nitrogenase.
(17) A correlation was not observed between the level of GS expression and the extent of symbiotic heterocyst differentiation in Nostoc sp.
(18) The other class exhibits an altered heterocyst spacing pattern.
(19) Mutants with decreased heterocyst frequency due to defective differentiation and development showed less growth and nitrogen fixation in nitrogen-free medium than the parent alga.
(20) Cyanobacteria require boron for formation of nitrogen-fixing heterocysts and boron may be beneficial to animals.