(1) Some males, called 'barless', have functional melanophores in the eyebar region but never display this pattern, because melanin in eyebar pigment cells is never dispersed.
(2) Photoelectric recordings of this paling response revealed no differences between barred and barless males, or between the eyebar and other facial chromatophores that do not function as visual displays.
(3) Lesioning the 'eyebar nerve' resulted in immediate melanin dispersion and consequent darkening of the eyebar pattern, and it abolished the normal paling response in all behavioral situations.
(4) This physiological difference is correlated with a difference in the alpha adrenoceptor-mediated aggregation response of the cells in vitro: eyebar melanophores of barless males are significantly more responsive to physiological concentrations of the sympathetic neurotransmitter norepinephrine than those of barred males, and this intermorph difference appears to be unique to the eyebar color pattern.
(5) A prominent dark facial stripe, the 'eyebar', is an important component of the reproductive coloration and dominance displays of 'barred' territorial male Haplochromis burtoni (Teleostei; Cichlidae).
(6) An adjustable eyebar spacer, which allows the cranium to be rotated in the stereotaxic instrument, is described.
(7) Thus, the difference in the physiological state of eyebar melanophores in intact barred and barless males cannot be explained by differences in peripheral nerve anatomy or physiology.
(8) When barless males first begin to use the eyebar as a social display, the physiological state of melanophores changes from aggregation to dispersion.
(9) Both anatomical and physiological differences characterize eyebar pigment cells of barred and barless males.
(10) Melanophores and iridophores, which form a single structural and functional unit in the eyebar, contain less pigment in barless males.
(11) Territorial male Haplochromis burtoni (Teleostei; Cichlidae) have a dark facial stripe, the 'eyebar', which can appear and disappear within seconds, independently of other coloration patterns.
(12) The eyebar melanophores are controlled by a specialized branch of the maxillary nerve.
(13) Physiologically, eyebar melanophores are tonically expanded in barred males, contracted in barless males.
(14) 'Barless' territorial males are identical to barred, behaviorally and morphologically, except they completely lack an eyebar during agonistic encounters with conspecifics.
(15) Physiological and morphological characteristics of eyebar pigment cells are functionally related.
(16) Nerve lesion produced similar results in both barred and barless males, except that the coloration of the denervated eyebar in barless males was more similar to camouflage markings than to the conspicuous black eyebar used as a social signal.
Fix
Definition:
(v. t.) To transfix; to pierce.
(a.) Fixed; solidified.
(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.