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At least 145 records · Page 8Linked to original sources
PubMed1999

A comparison of global questions versus health status questionnaires as measures of the severity and impact of asthma.

This study compared estimates of the severity and impact of asthma recorded using global questions of the type used in diary cards with health status measurements obtained using comprehensive questionnaires. Seventy-four outpatients with asthma, aged 17-76 yrs (mean 48 yrs) participated. Mean+/-SD forced expiratory volume in one second (FEV1) was 72+/-26% predicted. Patients recorded morning and evening peak expiratory flow rate (PEFR) and scaled their responses to the questions: "How has your asthma been today?" (asthma severity) and "How much effect has your asthma had on your life today?" (asthma impact) for 2 weeks. They then completed Juniper's Asthma Quality of Life Questionnaire (AQLQ) and the St George's Respiratory Questionnaire (SGRQ). Diary card scores for asthma impact were less severe than for asthma severity (p<0.0001). Both correlated with AQLQ and SGRQ total scores (r>0.7; p<0.0001). Some patients responded 'none' for asthma severity (n=10) or asthma impact (n=13) on all 14 days of recording. For these patients, FEV1 was <80% predicted, morning PEFR was <90% predicted and their AQLQ and SGRQ scores indicated significant health impairment. Diary card scores for asthma severity and impact were correlated with health status, but these global questions were insensitive in mild disease. Responses to these questions were influenced by their wording, so the number of symptom-free days calculated from diary cards will depend on the questions used. Standardization is required before symptom-free days can be used as a reliable measure of treatment efficacy.

Adolescent↗
PubMed2002

Family impact of child oral and oro-facial conditions.

OBJECTIVES: The aim of this study was to develop and evaluate the Family Impact Scale, a measure of the family impact of child oral and oro-facial disorders. This formed one component of the Child Oral Health Quality of Life Instrument. METHODS: The scale was developed using a process described by Guyatt et al. (1987) and Juniper et al. (1996). An item pool was developed using a review of existing child health status and family impact questionnaires, interviews with 41 parents-caregivers of children with paedodontic, orthodontic and oro-facial conditions and discussions with dental specialists. The resulting pool of 21 items was used in an item impact study in which 93 parents-caregivers provided data on the frequency and importance of these items. The 14 items identified most frequently or rated the most important were selected for the final questionnaire. The discriminant and construct validity and internal consistency reliability of this 14-item scale were assessed in a study of 266 parents-caregivers from the three clinical groups. Seventy-nine of these participants completed a second copy of the questionnaire to facilitate assessment of test-retest reliability. RESULTS: Family Impact Scale scores ranged from 0 to 33, indicating that the measure was sensitive to variations in family impact. Floor effects were minimal with only 10.2% of subjects having a score of zero and there were no ceiling effects, that is, subjects with maximum scores. Almost three-quarters of parents-caregivers reported some family impact 'sometimes' or 'often/everyday' over the previous 3 months. Impact on parental or family activities of this frequency was reported by 53.0%, impact on parental emotions by 44.0%, conflict in the family by 31.6% and financial difficulties by 31.2%. The measure and its component items were reasonably good at discriminating between the three clinical groups included in the study and showed good construct validity. It had excellent internal consistency reliability with a Cronbach's alpha of 0.83 and was reproducible for parent-caregivers who reported that their child's condition was stable (ICC = 0.80). CONCLUSIONS: The study provides some data to suggest that child oral and oro-facial conditions have a pervasive impact on the family. The Family Impact Scale had good technical properties. Its evaluative properties need to be tested in longitudinal studies.

Adolescent↗
PubMed2000

Spatial and temporal aspects of the genetic structure of Juniperus communis populations.

Juniperus communis is a dioecious, wind pollinated shrub or small tree that produces 'berries' (female cones) containing a small number of seeds that are thought to be dispersed by birds. The expectation, therefore, would be that populations of Juniper are genetically diverse with little structuring between them. In Britain, the species has two main centres of distribution: a highland zone in the north and west, in which populations are still large and sexually reproducing, and a southern zone on chalk downlands in which populations are small and fragmented and individuals suffer from a decline in fertility. Thus, one would expect the large sexually viable populations in the north to exhibit high levels of within-population genetic variation, while the declining southern populations would be genetically depauperate. The analysis of amplified fragment length polymorphisms (AFLPs) was used to test this hypothesis. Surprisingly, all populations studied showed high levels of genetic variation although there was clear structuring between populations. On the basis of the geographical structuring of the populations it was hypothesized that J. communis colonized Britain via three separate routes.

Genetic Markers↗
PubMed2002

Investigation on the supercritical CO(2) extraction of the volatile constituents from Juniperus communis obtained under different treatments of the "berries" (cones).

The present investigation reports the experimental data a) from the recovery and the composition of the extract under super critical fluid extraction from Juniperus communis L. "berries" (cones), and b) their comparison with those of the essential oil obtained by hydrodistillation. For the extraction of the juniper oil different values of temperature and pressure were applied; furthermore, the degree of comminution of the plant material was also considered - a) integral "berries" and b) comminuted "berries". The quality of the oil recovered from the "berries" by supercritical carbon dioxide extraction was found to be highly dependent on the applied conditions. The comminution affected greatly the oil recovery and consequently the final composition of the extracts. Significant differences were recorded between the supercritical CO(2) extract and the distilled oil, the latter being more enriched in monoterpenoid hydrocarbons.

Acyclic Monoterpenes↗
PubMed2002

Molecular, structural, and immunologic relationships between different families of recombinant calcium-binding pollen allergens.

BACKGROUND: Calcium-binding plant allergens can be grouped in different families according to the number of calcium-binding domains (EF hands). OBJECTIVE: We sought to identify pollens containing crossreactive calcium-binding allergens and to investigate structural and immunologic similarities of members belonging to different families of calcium-binding allergens. METHODS: By means of multiple sequence alignment and molecular modeling, we searched for structural similarities among pollen allergens with 2 (Phl p 7, timothy grass; Aln g 4, alder), 3 (Bet v 3, birch) and 4 EF hands (Jun o 4, prickly juniper). Purified recombinant Aln g 4 and Jun o 4 were used to determine the prevalence of IgE recognition in 210 patients sensitized to different pollens and to search, by means of ELISA competition, for the presence of cross-reactive epitopes in pollens from 16 unrelated plant species. IgE cross-reactivity among the allergen families was studied with purified rPhl p 7, rAln g 4, rBet v 3, and rJun o 4 and 2 synthetic peptides comprising the N-terminal and C-terminal EF hands of Phl p 7 by means of ELISA competition. RESULTS: Structural similarities were found by using molecular modeling among the allergens with 2, 3, and 4 EF hands. Pollens from 16 unrelated plants contained Aln g 4- and Jun o 4-related epitopes. Twenty-two percent of the patients with multiple pollen sensitization reacted to at least one of the calcium-binding allergens. A hierarchy of IgE cross-reactivity (rPhl p7 > rAln g 4 > rJun o 4 > rBet v 3) could be established that identified rPhl p 7 as the EF-hand allergen containing most IgE epitopes in the population studied. CONCLUSION: The demonstration that members of different families of calcium-binding plant allergens share similarities suggests that it may be possible to use representative molecules for the diagnosis and therapy of allergies to EF-hand allergens.

Allergens↗
PubMedDate not supplied

Computer game for inner-city children does not improve asthma outcomes.

INTRODUCTION: The purpose of this randomized control trial was to evaluate the effects of a computer-assisted instructional (CAI) game on asthma symptoms (eg, coughing, wheezing, shortness of breath, and nighttime awakenings) in 7- to 12-year-old inner-city children over 12 weeks. METHOD: A CAI that focused on reducing environmental irritants/allergens and the correct use of prescribed medications to prevent asthma symptoms was used with 101 children (56 in the intervention group and 45 in the control group). The primary outcome evaluated a change in children's asthma symptoms as measured by responses to nine symptom questions in Juniper's Pediatric Asthma Quality of Life Questionnaire (PAQOL) and measurements of lung function. RESULTS: No significant changes in asthma symptoms occurred between the two groups before and after the intervention. No significant changes were noted in PAQOL scores for activities, emotions, and total PAQOL score, lung function measurements, and asthma severity between the two groups. Asthma knowledge of both groups was high before intervention, but there were no significant changes between groups after the intervention. DISCUSSION: Findings indicate that this CAI game was not effective in improving asthma symptoms in this group of children.

Asthma↗
PubMed1984

Guatemalan forest synthesis after Pleistocene aridity.

Sediments from two lakes in the Peten Department, Guatemala, provide palynological evidence from Central America of late Pleistocene aridity and subsequent synthesis of mesic forests. Late Glacial vegetation consisted of marsh, savanna, and juniper scrub. An early Holocene temperate forest preceded a mesic tropical forest with Brosimum (ramon). Thus "primeval" rain forests of Guatemala are no older than 10,000 to 11,000 years and are considerably younger in the Peten due to Mayan disturbances. Among dated Neotropical sites, the Peten has the most mesic vegetation yet shown to have supplanted xeric vegetation present during the Pleistocene. The arid late Glacial-humid early Holocene transition appears to have been pantropical in the lowlands. The Peten was not a Pleistocene refugium for mesophytic taxa, as has been suggested. Thus genesis of extant rain forests in northern Central America and southern Mexico remains unexplained.

Journal Article↗
PubMed1998

Drought-induced shift of a forest-woodland ecotone: rapid landscape response to climate variation.

In coming decades, global climate changes are expected to produce large shifts in vegetation distributions at unprecedented rates. These shifts are expected to be most rapid and extreme at ecotones, the boundaries between ecosystems, particularly those in semiarid landscapes. However, current models do not adequately provide for such rapid effects-particularly those caused by mortality-largely because of the lack of data from field studies. Here we report the most rapid landscape-scale shift of a woody ecotone ever documented: in northern New Mexico in the 1950s, the ecotone between semiarid ponderosa pine forest and pinon-juniper woodland shifted extensively (2 km or more) and rapidly (<5 years) through mortality of ponderosa pines in response to a severe drought. This shift has persisted for 40 years. Forest patches within the shift zone became much more fragmented, and soil erosion greatly accelerated. The rapidity and the complex dynamics of the persistent shift point to the need to represent more accurately these dynamics, especially the mortality factor, in assessments of the effects of climate change.

Journal Article↗
PubMed2005

Factors associated with asthma control.

The aim of this study was to evaluate which factors are associated with asthma control experienced by asthma patients. In a cross-sectional study patients aged 16-60 years with mild to moderate asthma were selected. The influence of the following factors on asthma control was studied in a multivariate model: age, gender, socioeconomic status, smoking, perceived hyperresponsiveness (PHR, responding with asthma symptoms to one or more triggers), allergy (Phadiatop), long-acting bronchodilating agents, and inhaled corticosteroids. Asthma control was measured by means of the Asthma Control Questionnaire (ACQ) as developed by Juniper. Forced expiratory volume in 1 second (FEV1) was measured by means of a portable spirometer. In this study with 311 patients, mean ACQ score was 1.39 (range 0-4.43). A stepwise backward linear regression analysis showed that low socioeconomic status (beta 0.425; p=0.001), current smoking (beta 0.555; p<0.001), high dose of inhaled corticosteroids (beta 0.364; p=0.04) and perceived hyperresponsiveness for increasing number of different triggers (PHR for 1 trigger beta 0.833; p=0.03; 2 triggers beta 0.810; p=0.03; 3 triggers beta 0.995; p=0.01; 4 triggers beta 1.131; p=0.002; 5 triggers beta 1.182; p=0.002) are independent predictors for poorer asthma control. Beside treatment with medication, stopping smoking and avoidance of triggers are factors, which may have a high impact on asthma control.

Administration, Inhalation↗
PubMedDate not supplied

A longitudinal analysis of the efficacy of environmental interventions on asthma-related quality of life and symptoms among children in urban public housing.

In an environmental intervention study in public housing, we examined monthly Juniper Paediatric Asthma Quality of Life (QOL) Questionnaires for 51 children. Longitudinal analysis and spline models were used to identify time periods with significant improvements in QOL to inform judgments about causality. We found significant improvements in QOL, with moderate improvements before environmental interventions, increased rates of improvement immediately after, and reduced rates more than 5 months post-intervention. Effect modification analyses identified high-risk subpopulations and emphasized the importance of environmental, social, and economic conditions. Our results demonstrate the value of longitudinal techniques in evaluating the benefits of environmental interventions for asthma.

Adolescent↗
PubMed2006

Comparison of composition and antifungal activity of Artemisia argyi Lévl. et Vant inflorescence essential oil extracted by hydrodistillation and supercritical carbon dioxide.

Essential oil of Artemisia argyi Lévl. et Vant inflorescence was obtained by supercritical CO(2) extraction and hydrodistillation. The oil was analyzed by gas chromatography/mass spectrometry to characterize its components and was also tested for antifungal activity. A total of 61 compounds were identified in the hydrodistilled oil. The major components were 1,8-cineole (4.46%), borneol (3.58%), terpinol (10.18%), spathulenol (10.03%), caryophyllene oxide (6.51%), juniper camphor (8.74%), Camazulene (2.05%), and camphor (3.49%). By using supercritical CO(2) at 50 degrees C and 10 MPa, the concentrations of previous main components were lower than oil obtained by hydrodistillation, while miscellaneous compounds were higher. The essential oil extracted by these two methods exhibited antifungal activity against Botrytis cinerea and Alternaria alternate, two common storage pathogens of fruits and vegetables. The inhibition of B. cinerea and A. alternate were 93.3 and 84.7% for oil extracted by hydrodistillation when exposed to a concentration of 1,000 mg L(-1), while values of 70.8 and 60.5% were observed from oil extracted by supercritical CO(2).

Alternaria↗
PubMed2000

Strategy Space and the Disturbance Spectrum: A Life-History Model for Tree Species Coexistence.

The disturbance spectrum consists of disturbance patterns differing in type, size, intensity, and frequency. It is proposed that tree life-history traits are adaptations to particular disturbance regimes. Four independent axes are proposed to define the dominant dimensions of tree strategy space: shade tolerance, tree height, capacity for vegetative reproduction, and seed dispersal distance. A fitness model was developed to elucidate interactions between the proposed life-history traits. The model shows how alternate life-history sets can coexist when disturbance patterns fluctuate in space and time. Variable disturbance regimes were shown, based on data and simulation results, to enhance species coexistence, as predicted. The strategy space model accurately predicts the number of common tree species for the eastern United States, boreal Canada, and southwestern piñon-juniper woodlands. The model also provides an explanation for latitudinal gradients in tree species richness in North America and Europe. The proposed model predicts a relationship between disturbance characteristics and the species composition of a forest that allows for the coexistence of large numbers of species. The life-history traits of size, growth rate, life span, shade tolerance, age of reproduction, seed dispersal distance, and vegetative reproduction are all incorporated into the model.

biodiversity↗
PubMed1997

Parasites of mammals on the Sevilleta National Wildlife Refuge, Socorro, New Mexico: Cuterebra austeni and C. neomexicana (Diptera:Oestridae) from Neotoma and Peromyscus (Rodentia:Muridae), 1991-1994.

In total, 6,486 rodents representing 3 families (Muridae, Heteromyidae, and Sciuridae) and 24 species were trapped May through August of 1991 through 1994. Of these, only the white-throated woodrat. Neotoma albigula Hartley; piñon mouse, Peromyscus truei Shufeldt; and white-footed mouse, P. leucopus Rafinesque, were infested with Cuterebra Clark larvae. Of the 594 N. albigula that were captured 103 (17.3%) were infested with 139 Cuterebra larvae with all infestations occurring in the throat region. N. albigula infestations were observed in 4 of 5 habitats sampled. The highest prevalence of infestation occurred during May-June (27.2%) versus July-August (9.1%) and in males (25.2%) versus females (18.3%). Prevalence of infestation was not significantly different between animals from the mark-release webs versus removal webs or adults versus juveniles. Also, there was no correlation between relative density of N. albigula and prevalence of infestation. Fifteen adults were reared from puparia and identified as C. austeni Sabrosky. Of 716 P. truei captured, 22 (3.1%) were infested with a total of 25 Cuterebra larvae with all infestations occurring in the scapular region. Although P. truei were captured in all 5 habitats, they were only infested in the piñon-juniper habitat: the highest prevalence of infestation occurred during July-August (10.9%) versus May-June (3.3%). Prevalence of infestation was not significantly different between animals from mark-release webs versus removal webs, males versus females, or adults versus juveniles. As in the N. albigula, there was no correlation between relative density of P. truei and prevalence of infestation. The adult reared from a puparium was identified as C. neomexicana Sabrosky. Of the 310 P. leucopus captured, only 3 (1%) were infested with Cuterebra larvae.

Animals↗
PubMedDate not supplied

Carbon and oxygen isotope ratios of ecosystem respiration along an Oregon conifer transect: preliminary observations based on small-flask sampling.

Isotope ratio analyses of atmospheric CO(2) at natural abundance have significant potential for contributing to our understanding of photosynthetic and respiration processes in forest ecosystems. Recent advances in isotope ratio mass spectrometry allow for rapid, on-line analysis of small volumes of CO(2) in air, and open new research opportunities at the ecophysiological, whole-organism, and atmospheric levels. Among the immediate applications are the carbon and oxygen isotope ratio analyses of carbon dioxide in atmospheric air. Routine analysis of carbon dioxide in air volumes of approximately 50-300 &mgr;l is accomplished by linking a commercially available, trace gas condenser and gas chromatograph to an isotope ratio mass spectrometer operated in continuous-flow mode. Samples collected in the field are stored in either gas-tight syringes or 100-ml flasks. The small sample volume required makes it possible to subsample the air in flasks for CO(2) and then to sample the remaining air volume for the analysis of the isotopic composition of either methane or nitrous oxide. Reliable delta(13)C and delta(18)O values can be obtained from samples collected and stored for 1-3 days. Longer-term storage, on the order of weeks, is possible for delta(13)C measurements without drift in the isotope ratio signal, and should also be possible for delta(18)O measurements. When linked with an infrared gas analyzer, pump and flask sampling system, it is feasible to sample CO(2) extensively in remote forest locations. The air-sampling system was used to measure the isotope ratios of atmospheric CO(2) and to conduct a regression analysis of the relationship between these two parameters. From the regression, we calculated the delta(13)C of ecosystem respiration of four coniferous ecosystems along a precipitation gradient in central Oregon. The ecosystems along the coast-to-interior Oregon (OTTER) gradient are dominated by spruce-hemlock forests at the wet, coastal sites (> 200 cm precipitation annually) to juniper woodlands (20 cm precipitation) at the interior, dry end of the transect. The delta(13)C values of ecosystem respiration along this transect differed by only 1.3 per thousand (range of -25.2 to -23.9 per thousand ) during August at the peak of the summer drought. Following autumn rains in September, the delta(13)C of ecosystem respiration in the four stands decreased; overall the difference in the carbon isotope ratio of ecosystem respiration among sites increased to 3.9 per thousand (-26.8 to -22.9 per thousand ).

Journal Article↗
PubMed1984

Allergy in the Mediterranean area. I. Pollen counts and pollinosis of Montpellier.

The climatic conditions of the Mediterranean area result in vegetation and pollen very different from that of the other parts of Europe. The pollen content of the atmosphere of Montpellier, southern France, was examined using a filter sampler which was shown to be more efficient than most of the current devices for air sampling. Pollen counts were subsequently compared with pollinosis of patients born and living in and around Montpellier. The mean annual pollen counts showed that grass pollens and Cupressaceae pollens (cypress and juniper) are the highest. Some Mediterranean pollens (Oleaceae, London plane, Parietaria) are also important. Plantain and oak pollens are also present in relatively large amounts. Grass pollen allergy was found to be present in 86.5% of pollen-allergic patients. It was followed by plantain, Parietaria, Oleaceae, London plane and Cupressaceae pollens which were allergenic in 13-36% of pollen-allergic patients. Oak and pine pollens were present in large quantities in the counts but few persons were sensitive to oak and none to pine. By contrast, some patients had positive skin tests to alfalfa, red clover, acacia and lime tree pollens though these pollens were almost absent from the counts. In a few cases local sources of these pollens could account for the positive skin tests but cross-sensitivities could also occur. In summary, pollinosis of the Northern Mediterranean area is intermediate between the southern part of the area and the other parts of Europe.

France↗
PubMed2006

Effects of levocetirizine as add-on therapy to fluticasone in seasonal allergic rhinitis.

BACKGROUND: Addition of H(1) antagonists to intranasal corticosteroid treatment of allergic rhinitis (AR) is common in clinical practice and recommended by guidelines, despite some evidence that the additive benefits are negligible. OBJECTIVE: To assess additional benefits of 5 mg levocetirizine dihydrochloride in seasonal AR patients using 200 mcg fluticasone propionate nasal spray once daily. METHODS: In a double-blind placebo-controlled crossover study of 27 patients, following 2 weeks without treatment, subjects used fluticasone with levocetirizine or identical placebo for 2 weeks each. Assessments were the Juniper mini Rhinoconjunctivitis Quality-of-Life Questionnaire (mini-RQLQ), domiciliary peak nasal inspiratory flow (PNIF), total nasal symptoms (TNS) scores and nasal nitric oxide concentrations. Effects were interpreted and tested against minimal clinically important differences. RESULTS: Add-on effects for levocetirizine vs. placebo excluded any clinically significant benefits: mean effects (one sided 95% confidence intervals) were mini-RQLQ -0.11 (-0.34), PNIF +0.57 (+5.23), and TNS -0.11 (-0.60). Numbers needed to treat (95% confidence intervals) by outcome were mini-RQLQ 14 (5 to 49), PNIF 4 (3-7), and TNS 3 (2-6). No significant within or between treatment effects were seen for nasal nitric oxide. CONCLUSION: Contrary to current practice, the present results demonstrate that for the majority of patients, antihistamine add-on to effective nasal steroid treatment is inappropriate. Further work is required to confirm that this is also true in the most severe cases, and the available evidence needs to be put into guidelines and implemented.

Administration, Intranasal↗
PubMed2006

Climate change may account for the decline in British ring ouzels Turdus torquatus.

1. Climate change is already affecting biodiversity, but the number of species for which reliable models relate weather and climate to demographic parameters is low. 2. We modelled the effect of temperature and rainfall on the breeding success and territory occupancy of ring ouzels Turdus torquatus (L.) in northern Britain, using data from a range of study areas, including one where there was a long-term decline in ring ouzel abundance. 3. Timing of breeding was significantly related to meteorological variables affecting birds in the early spring, though there was no evidence that laying dates had advanced. Breeding success was not significantly related to weather variables; instead, over 90% of annual variation in this parameter could be explained by density dependence. 4. Annual change in territory occupancy was linked to rainfall and temperature the preceding summer, after the main breeding season and to rainfall in the wintering grounds 24 months previously, coincident with the period of juniper Juniperus sp. (L.) flowering. High temperature in late summer, intermediate levels of late summer rainfall, and high spring rainfall in Morocco 24 months previously all had negative impacts on territory occupancy the following year. 5. All three weather variables have changed over recent decades, with a significant increase in summer temperature, a significant decrease in summer rainfall, and a nonsignificant decline in Moroccan spring rainfall. A model based on these trends alone predicted an annual decline in occupancy of 3.6% (compared with an observed decline of 1.2%), and suggested that increased summer temperatures may underlie declines in the British ring ouzel population. 6. Changes in summer temperature after the main breeding period could affect the survival rates of adult and/or juvenile birds. An improved understanding of the post-breeding ecology of ring ouzels is required to elucidate the mechanisms and causes of this relationship. Such knowledge might allow management aimed at buffering the impacts of climate change on ring ouzels.

Animal Migration↗
PubMed1995

IgE-mediated allergy to wood dusts probably does not explain the high prevalence of respiratory symptoms among Swedish woodwork teachers.

A previous study revealed an increased occurrence of work-related respiratory complaints among Swedish woodwork teachers. For determination of whether an IgE-mediated mechanism was the cause of the symptoms, 127 woodwork teachers and 111 reference subjects (other school personnel) in Stockholm gave serum for analysis of total IgE, Phadiatop, and RAST to extract of sawdust from five commonly used Scandinavian woods (pine, birch, juniper, alder, and linden). The total serum-IgE level was similar in the woodwork teachers (geometric mean 35, range < 2-1700 kU/l) and the reference group (34, < 2-860 kU/l), and the frequency of positive Phadiatop was equal (29.9% and 31.5%, respectively). RAST was positive only in three cases, two reference subjects (birch and pine) and one woodwork teacher (alder). Hence, no correlation between exposure and sensitization to wood dust was found, and the results do not support the assumption that the complaints related to exposure to dusts from the examined Scandinavian woods are IgE mediated.

Adult↗