(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.
Ragwort
Definition:
(n.) A name given to several species of the composite genus Senecio.
Example Sentences:
(1) The poisonous principles in tansy ragwort are pyrrolizidine alkaloids, which cause gradual alteration and necrosis of liver cells with replacement by fibrous tissue.
(2) In control rats, most fecal vitamin A was excreted in the first 24 h post-dosing, while in tansy ragwort-fed animals, the excretion was delayed, suggesting a possible effect of PA on gut motility.
(3) The effect of feeding a diet containing 5% tansy ragwort (TR) (Senecio jacobaea), a poisonous plant containing pyrrolizidine alkaloids (PA), on the blood and liver levels of copper, zinc, iron and vitamin A in broiler chicks was examined.
(4) Like his colleague Tory MP Nicholas Soames, who in 2009 called the "scourge" of ragwort a national "shame", Benyon struck back, saying his critics were being "unnecessarily aggressive", and that he wasn't advocating ethnic cleansing of ragwort but that he wanted to deal with "a severe infestation of a poisonous plant".
(5) Calves and cows (n = 45) were fed daily doses of dried prebud tansy ragwort (Senecio jacobaea) derived from a single plant collection made in Tillamook, Oregon.
(6) There is a chapter on ragwort in one of the standard textbooks," wrote another.
(7) In group 1, 4 calves were continuously fed dried tansy ragwort mixed in a pelleted feed at a 5% concentration by dry weight until terminal liver disease developed.
(8) The hepatotoxic alkaloids known to occur in tansy ragwort (Senecio jacobaea L.) are also present in honey produced from the nectar of this species.
(9) Twenty-five 1-week-old male chicks were fed for 6 weeks on a standard diet incorporating 7% dried and ground ragwort (Senecio jacobea).
(11) It is thus apparent that the disease can be confused clinically with many others, and tansy ragwort poisoning should be considered in animals exhibiting ascites, diarrhea and rectal prolapse.
(12) Selected case reports from closely controlled experimental feedings of Senecio jacobaea (tansy ragwort), S longilobus (threadleaf groundsel) and S riddellii (Riddell's groundsel) to cattle are presented to show that all 3 of these pyrrolizidine alkaloid-containing plants may not necessarily induce proximate toxicity, but may cause typical signs and death many months after the plants are ingested.
(13) And they attacked his ecological knowledge: "At least 30 insect and 14 fungi species are entirely reliant on ragwort, and about a third of the insects are scarce or rare.
(14) Landowners who wish to control ragwort face an impossible task when roadside verges are dominated by it to an extent I cannot remember in the past.
(15) Crotolaria spp, the ragwort (Senecia jacobaea), the lantana spp.
(16) The former Conservative cabinet minister Lord Tebbit has said young unemployed people should be made to pull up ragwort from roadside verges in return for benefits.
(17) The animal's tolerance for the plant was dependent on the amount of tansy ragwort fed, and the duration of the dosing period.
(18) In two experiments, the effect of feeding the pyrrolizidine alkaloid (PA)-containing plant tansy ragwort (Senecio jacobaea) on the metabolism of vitamin A in rats was examined.
(19) As for East Anglia’s ragwort problem, I suggest that instead of press-ganging our young, we might start making our legion of tax evaders pay it forward.
(20) Ragwort Facebook Twitter Pinterest Caterpillars on ragwort.