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Nature Publishing Group (NPG)
Published 2015Staff ViewPublication Date: 2015-02-13Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Adipogenesis/genetics ; Adiposity/genetics ; Age Factors ; *Body Mass Index ; Continental Population Groups/genetics ; Energy Metabolism/genetics ; Europe/ethnology ; Female ; Genetic Predisposition to Disease/genetics ; *Genome-Wide Association Study ; Glutamic Acid/metabolism ; Humans ; Insulin/metabolism/secretion ; Male ; Obesity/*genetics/*metabolism ; Polymorphism, Single Nucleotide/genetics ; Quantitative Trait Loci/genetics ; Synapses/metabolismPublished by: -
2Van Amsterdam, J. G. C. ; Zanen, P. ; Somer, S. ; Van Loveren, H. ; Opperhuizen, A. ; Steerenberg, P. A.
Oxford, UK : Munksgaard International Publishers
Published 2003Staff ViewISSN: 1399-3038Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: Levels of exhaled nitric oxide (eNO) are flow-dependent, and the choice of an optimal flow rate for off-line and on-line eNO measurement has raised much debate. Recently, a flow rate of 50 ml/s was recommended, but children younger than 5–6 years are not capable of stabilizing their expiratory flow at low flow rates. The power of off-line eNO values to discriminate between normal and atopic children was therefore evaluated at different exhalation flow rates. At flow rates of both 8.3 ml/s and of 350 ml/s, children (8–12 years) sensitive to house dust mite have two-fold higher eNO values (p 〈 0.001) as compared with children lacking such a sensitivity. The power of eNO to discriminate between normal and atopic subjects was similar at the two flow rates (no difference in AUC of receiver operation curves, p = 0.89). All children from 4.5 to 5 years of age (n = 29) could perform a single off-line exhalation manoeuvre at high (〉350 ml/s) but not at low (8.3 ml/s) flow rates. At high exhalation flow rate, eNO was 7.1 ± 2.4 (mean ± SD) median, 6.5 p.p.b. with a mean variation coefficient of 5.5%. Depending on their developmental level, about half of the younger children (35–46 months of age) could perform an off-line exhalation manoeuvre at high flow rate with good reproducibility (mean variation coefficient of 6.6%). It is concluded that an exhalation flow rate of 350 ml/s is feasible to determine off-line eNO-values in children from 3.5 years of age, and that this high flow rate does not compromise the power of eNO to detect allergic disease.Type of Medium: Electronic ResourceURL: -
3Staff View
ISSN: 1432-1351Keywords: Key words Insect attraction ; Sex pheromone ; Plume ; Wind ; Visual orientationSource: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Abstract By attaching a reflective strip to the thorax, we documented with video recordings in a wind tunnel the spatial orientation of male gypsy moths, Lymantria dispar, as they flew along a plume of sex pheromone. In wind speeds of 61, 122, and 183 cm s−1, moths flew very similar tracks along a pheromone plume. Moths aimed their thrust closer to upwind in increasing wind speeds using a roll maneuver. As a result, the orientation of their visual flow field, represented by the slip angle (the angular distance between the direction of flight and the longitudinal body axis), remained relatively constant. We propose that directional control during self-steered zigzagging is achieved by rolling, thereby maintaining a set slip angle. Following a roll at the apex of a turn that aligns the moth with its preferred slip angle, a moth banks toward a cross wind leg. By banking moths may maintain a stable image flow at oblique angles to their longitudinal body axis.Type of Medium: Electronic ResourceURL: -
4Staff View
ISSN: 1432-1041Keywords: Corticosteroids ; Clinical trials ; Therapeutic equivalence ; statistics ; sample size ; inhalationSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyMedicineNotes: Abstract In the near future it is to be expected that many new inhaled corticosteroids or formulations of these drugs will be compared with older ones, to discover whether they are therapeutically equivalent or not. The statistical evaluation of these trials differs from the classic methods. When two averages are similar or differ only slightly, power is very low. The regulatory bodies demand a power of at least 80%. This problem was initially solved by using the so-called power approach. Researchers included enough volunteers to enable them to detect a predefined difference, considered to be without any clinical significance, with a power of 80%. This approach, however, has been shown to be incorrect and has been replaced by the two one-sided tests procedure, where a new sample size equation is derived. Important elements of this new equation are the coefficient of variation of the parameter measured, the difference between the averages of the two groups and the equivalence limit (the difference between the means still tolerable). This equation was used in the present study to estimate the number of volunteers needed in a parallel inhaled corticosteroids equivalence trial. The end points chosen were the changes in FEV1 and PC20 due to the corticosteroid effect. Calculations were performed by extracting data from published placebo-controlled trials, and defining a range of equivalence limits and differences between the group averages. It was shown that a huge number of volunteers (500–1000) will be needed, as a result of the small corticosteroid effect and the high variance. In the case of inhaled corticosteroids, the equivalence limit is not known and needs defining to avoid discussions on the outcome. Due to the high number of patients who need to be included, the trial will most probably be multicentre and take place in several countries. Such a trial will suffer from several sources of bias. For instance, the definition of asthma can differ from country to country and from researcher to researcher, resulting in non-comparable groups of patients. The many sources of bias will make the outcome difficult to interpret. Therefore alternative methods to establish therapeutic equivalence are proposed and discussed.Type of Medium: Electronic ResourceURL: -
5Staff View
ISSN: 1432-1041Source: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyMedicineType of Medium: Electronic ResourceURL: -
6Staff View
ISSN: 1432-1041Keywords: Key words Aerosols ; Ipratropium bromideSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyMedicineNotes: Abstract Objective: In previous experiments we showed that monodisperse bronchodilator aerosols with a median mass aerodynamic diameter of 2.8 μm induced stronger bronchodilatations than larger aerosols and that the dilatations were clinically relevant at low doses. To discover whether the bronchodilator effects of these low-dose monodisperse aerosols differed from those of standard dosages delivered by metered-dose inhalers, we carried out a comparative trial. Methods: Ten stable outpatients with a mean forced expiratory volume in 1 s (FEV1) of 58.1% of the predic-ted value inhaled a placebo aerosol, 8 μg of a 2.8-μm monodisperse ipratropium bromide aerosol and 40 μg from a metered-dose inhaler plus spacer; lung-function measurements followed. Data were analysed with repeated measurements analysis of variance (ANOVA). Results: Greater improvements than with placebo were evident for the forced vital capacity (FVC), the FEV1, the specific airway conductance (sGaw), the peak flow (PEF) and the maximum expiratory flow at 75% of the forced vital capacity (MEF75). In these cases, the low-dose 2.8-μm aerosol proved to be equivalent to the higher-dose metered-dose inhaler. Conclusion: By changing the polydisperse characteristic of inhaled aerosols to a monodisperse pattern, the dose of the drug administered can be reduced without loss of efficacy.Type of Medium: Electronic ResourceURL: -
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ISSN: 1573-1561Keywords: Hymenoptera ; Braconidae ; Microplitis croceipes ; parasitoid behavior ; habitat location ; Heliothis zea ; Lepidoptera ; Noctuidae ; flight tunnel ; female flights ; preflight handlingSource: Springer Online Journal Archives 1860-2000Topics: BiologyChemistry and PharmacologyNotes: Abstract Oriented responses ofMicroplitis croceipes (Cresson) to airborne odors of actively feedingHeliothis zea (Boddie) larvae were observed in a flight tunnel. The behavior ofM. croceipes prior to and during sustained, oriented flights was videotaped and analyzed in detail. Preflight exposure of the parasitoid to feces and other components of the plant-host complex were found to be vital in effective flight behavior, while maturation of the parasitoid had little effect. The increased frequency of oriented flight that resulted from preflight exposure of a plant-host complex persisted for at least 24 hr.Type of Medium: Electronic ResourceURL: -
8Staff View
ISSN: 1573-1561Keywords: Hymenoptera ; Braconidae ; Microplitis croceipes ; Heliothis zea ; Lepidoptera ; Noctuidae ; anemotaxis ; parasitoid ; jet plumes ; optomotor response ; semiochemicalsSource: Springer Online Journal Archives 1860-2000Topics: BiologyChemistry and PharmacologyNotes: Abstract Odor-mediated host-searching by femaleMicroplitis croceipes, a braconid endoparasitoid of larvalHeliothis species, was studied in a flight tunnel. Volatiles emitted by third-instarH. zea feeding on cowpea seedling leaves were released and carried with the wind, resulting either in an irregularly shaped plume, or injected with high velocity, resulting in a conically shaped jet plume. Flight maneuvers ofM. croceipes had a higher stereotype in jet plumes compared to irregularly shaped plumes. Variation in odor concentration in jet plumes due to intermittent feeding of the host larvae did not affect the number of flights. At the levels employed, odor concentration did not alter the rate of upwind progress in jet plumes. Because air velocity inside a jet increases in the upwind direction,M. crocepies regulates its ground-speed during its approach to the odor source.Type of Medium: Electronic ResourceURL: