(n.) The fabled food of the gods (as nectar was their drink), which conferred immortality upon those who partook of it.
(n.) An unguent of the gods.
(n.) A perfumed unguent, salve, or draught; something very pleasing to the taste or smell.
(n.) Formerly, a kind of fragrant plant; now (Bot.), a genus of plants, including some coarse and worthless weeds, called ragweed, hogweed, etc.
Example Sentences:
(1) All patients were found to be sensitive to Ambrosia.
(2) The acute and subchronic toxicity of the molluscicidal plant, Ambrosia maritima L., has been tested on rats.
(3) A new species of the genus Zygozyma, Z. smithiae, was recovered from frass of the ambrosia beetle, Crossotarsus externedentatus in Northern Natal.
(4) Four hundred children were skin tested with following allergens: Dermatophagoides pteronyssinus, moulds, animal dander (mixture of dog, cat, sheep and horse dander), tree pollens, weed pollen (Ambrosia artemisifolia), and six grass pollens, as well as three nutritive allergens in children less than three years of age.
(5) Comparison of pollen capture with meteorologic data demonstrated that photoperiodic responses probably account for the initiation and termination of Ambrosia flowering, and to some extent that of Parthenium, and not sharply lowered temperatures or frost for ending pollen release.
(6) Skin tests with Ambrosia allergen extracts showed a positive rate of 67.7% in 624 cases of pollinosis.
(7) The total allergenicity of a pollen extract Ambrosia elatior was measured by quantitative prick test applied to the skin of seven highly sensitive patients and by standardized method of RAST-inhibition.
(8) The animals were placed in a cell in which an allergen-water-dialyzed extract of ambrosia pollen was dispersed by means of coaxial pulveriser.
(9) Anthemis cotula (dog fennel) and Xanthium strumarium (cocklebur) gave the most frequent positive results, demonstrating a change of frequency in sensitivity compared to the 1950s, when Ambrosia artemisiifolia (ragweed) was recognized as the most frequently sensitizing weed.
(10) This study analyzes Amb a I, a family of related proteins formerly known as Ag E, that comprise the major allergens of short ragweed (Ambrosia artemisiifolia).
(11) Since both Parthenium and Ambrosia are significant allergenic plants, correlations between airborne pollen of Parthenium and allergic potential suggest that a prolonged pollination season and perhaps increased allergenicity of unique Parthenium pollen proteins allow Parthenium to be a major allergen despite significantly less ambient pollen.
(12) Capture of native Ambrosia species and P. hysterophorus peaked in September and October in 1987 and 1988, but Parthenium pollen was also found year round with a smaller secondary peak during May, 1988 and 1989.
(13) The cloning of the AmbtV cDNA is important, since the 4.4-kDa AmbtV, one of the allergens in giant ragweed (Ambrosia trifida) pollen, serves as a simple model system to study the basic structural requirements for immune recognition of foreign protein allergens.
(14) Mean radionuclide levels in cattle tissue and environmental samples from Ambrosia Lake were higher in almost every comparison than those found in respective controls.
(15) Seeds of the short ragweed (Ambrosia artemisiifolia) were collected from 38 different sites in Champaign County, Ill. Plants from these seeds were grown under similar conditions, and antigen E (AgE) was determined on pollen samples harvested from individual plants.
(16) Mowing or hand weeding cannot eradicate Ambrosia artemisiifolia but if they are consistently used, they could reduce its population level over several years by decreasing seed production.
(17) These spectra were very close to those of the polysaccharides from the C. clavata and C. ambrosia groups of Ceratocystis species.
(18) Previous studies have associated skin test sensitivity and specific IgE response to Ambrosia artemisiifolia V (Amb a V) with HLA-DR2, and to Ambrosia trifida V (Amb t V) with HLA-DRw52 haplotypes in atopic individuals.
(19) Ambrosia Lake, New Mexico, has been the site of extensive U mining for 30 y and contains several underground U mines, a processing mill, and two large U tailings piles.
(20) Positive patch test reactions were 2+ for dandelion (Taraxacum officinale), false ragweed (Ambrosia acanthicarpa), giant ragweed (Ambrosia trifida), short ragweed (Ambrosia artemisifolia), sagebrush (Artemisia tridentata), wild feverfew (Parthenium hysterophorus), yarrow (Achillea millifolium), and tansy (Tanacetum vulgare) and 1+ for Dahlia species and English ivy (Hedera helix).
Ragweed
Definition:
(n.) A common American composite weed (Ambrosia artemisiaefolia) with finely divided leaves; hogweed.
Example Sentences:
(1) Using a large clinic population with adequate controls, significant correlation between ragweed, grass or tree pollen sensitivity and the dates of birth was not obtained.
(2) Twelve non-atopic and 27 atopic preschool children were studied to determine the effect of pertussis booster vaccination on cutaneous histamine sensitivity and IgE antibody response to the naturally-occurring ragweed aeroallergen.
(3) We particularly wished to analyze the impact of terbutaline on the late allergic reaction, but we found that terbutaline mixed with ragweed antigen does not affect either the immediate or late skin test reaction.
(4) This ratio was related significantly to symptom scores reported by patients during the ragweed season subsequent to immunotherapy.
(5) Thus, with the dosage used, the parenterally administered hyperimmune gamma globulin did not influence most measurements of ragweed hypersensitivity.
(6) Significant differences were also observed in symptom scores for individual weeks during the ragweed season.
(7) The stability of ragweed extracts as measured by Antigen E content is markedly enhanced with little loss after 15 month storage at 4 degrees C, when the extract is prepared as an alum precipitated suspension.
(8) The radioallergosorbent test was compared with currently accepted allergy diagnostic techniques in ragweed-sensitive and unselected patients.
(9) The first group was given immune sera (I) containing anti-ragweed IgE.
(10) To accomplish this, blood was obtained from patients with ragweed AR, granulocytes were isolated and fractionated by continuous density Percoll gradients, and the density distribution of these cells was determined after centrifugation.
(11) The 3 monoclonal antibodies studied recognized different components of timothy grass and 2 of them recognized kentucky june grass but none recognized components of ragweed extracts.
(12) Sixty ragweed-sensitive adults were randomized either to a course of four Pollinex-R hyposensitization injections during the 6 weeks before the ragweed-pollen season, or to budesonide aqueous nasal steroid spray, 400 micrograms daily, throughout the season.
(13) Furthermore, an additional 7 patients with ragweed-allergic rhinitis were studied prospectively while undergoing immunotherapy and Ab2 levels were found to increase with time posttreatment.
(14) We analyzed histamine, prostaglandin D2, IL-1, and leukocytes accumulating hourly for 12 hours at skin-chamber sites after local ragweed challenge in eight allergic subjects with cutaneous late-phase reactions.
(15) V (Ra5S), was isolated in ultrapure form from a 16-min extract of ragweed pollen by a combination of molecular sieving through an Amicon hollow fiber cartridge (H1P5), cation-exchange chromatography, and gel filtration.
(16) Previous work has demonstrated a close association between certain histocompatibility antigens and the gene that controls the IgE response to certain ragweed allergens.
(17) Astemizole (Hismanal; Janssen Pharmaceutica Inc., Mississauga, Ontario, Canada) and terfenadine (Seldane; Merrell Dow Pharmaceuticals [Canada], Inc., Concord, Ontario, Canada) were compared for clinical efficacy in a double-blind randomized trial during the ragweed pollen season.
(18) Seasonal changes in IgE antibodies and their relationship to IgG antibodies were studied in 52 patients with ragweed hay fever and 10 normal controls.
(19) In an attempt to differentiate between these two possible mechanisms, we obtained measurements of hemodynamics, respiratory mechanics, and O2 consumption (VO2) in nine asymptomatic adult ragweed asthmatics before and after inhalation challenge with either ragweed extract or methacholine.
(20) Total secretory IgA and specific anti-antigen E (AgE) antibodies (ab) in the IgA and IgG classes were measured in concentrated nasal washings from ragweed allergic and normal individuals by antigen binding or anti-alpha-radioimmunoassays.