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  • 1985-1989  (6)
  • Diptera  (4)
  • Salt  (2)
  • 1
    Digitale Medien
    Digitale Medien
    The efficacy of quantitative and qualitative chloride titrators in the estimation of human salt intake (1985)
    Springer
    Journal of molecular medicine 63 (1985), S. 62-67 
    Details
    ISSN: 1432-1440
    Schlagwort(e): Hypertension ; Sodium ; Salt ; Chloride ; Epidemiology ; Renal failure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary We evaluated the utility of chloride titrator sticks for facilitating the assessment of dietary salt intake, in a systematic series of clinical trials. These inexpensive devices were applied daily to 24-h or nocturnal urine specimens, thereby avoiding the inter- and intra-subject variability in salt excretion which confounds the use of occasional 24-h urine collections. Chloride and sodium concentrations in urine were highly correlated (r〉0.92) in either nocturnal, diurnal, or 24-h collections. The quantitative chloride titrator estimates and measured chloride concentrations were highly correlated as well (r〉0.99). The qualitative chloride titrator was graded on a simple scale, and was successfully employed by outpatients attempting to limit their salt intake. Commonly used antihypertensive medications did not interfere with the determinations. Additional chloride intake, such as supplemental potassium chloride, interfered with estimates of salt ingestion, but if the daily amount of potassium chloride supplement was constant, adjustments in interpretation could be made. Renal insufficiency introduced a systematic over-estimation of salt intake by the qualitative chloride tirator, but only at high salt intakes. Relative estimates of salt intake in subjects with renal failure were still possible. We conclude that chloride titrators can facilitate the management of patients who require a prescribed salt intake.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01733069
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  • 2
    Digitale Medien
    Digitale Medien
    Influence of genetic variance on sodium sensitivity of blood pressure (1987)
    Springer
    Journal of molecular medicine 65 (1987), S. 101-109 
    Details
    ISSN: 1432-1440
    Schlagwort(e): Blood Pressure ; Hypertension ; Salt ; Sodium ; Genetics ; Twin Model ; Salt Restriction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary To examine the effect of genetic variance on blood pressure, sodium homeostasis, and its regulatory determinants, we studied 37 pairs of monozygotic twins and 18 pairs of dizygotic twins under conditions of volume expansion and contraction. We found that, in addition to blood pressure and body size, sodium excretion in response to provocative maneuvers, glomerular filtration rate, the renin-angiotensin system, and the sympathetic nervous system are influenced by genetic variance. To elucidate the interaction of genetic factors and an environmental influence, namely, salt intake, we restricted dietary sodium in 44 families of twin children. In addition to a modest decrease in blood pressure, we found heterogeneous responses in blood pressure indicative of sodium sensitivity and resistance which were normally distributed. Strong parent-offspring resemblances were found in baseline blood pressures which persisted when adjustments were made for age and weight. Further, mother-offspring resemblances were observed in the change in blood pressure with sodium restriction. We conclude that the control of sodium homeostasis is heritable and that the change in blood pressure with sodium restriction is familial as well. These data speak to the interaction between the genetic susceptibility to hypertension and environmental influences which may result in its expression.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01728599
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  • 3
    Digitale Medien
    Digitale Medien
    Pungent spices, ground red pepper, and synthetic capsaicin as onion fly ovipositional deterrents (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 719-730 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Onion fly ; Delia antiqua ; Diptera ; Anthomyiidae ; oviposition ; deterrent ; capsaicin
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract In laboratory choice experiments, the spices dill, paprika, black pepper, chili powder, ginger, and red pepper deterredDelia antiqua oviposition by 88–100%. Dose-response choice tests demonstrated that 1 mg of ground cayenne pepper (GCP) placed within 1 cm of artificial onion foliage reduced oviposition by 78%. A synthetic analog of capsaicin, the principal flavor ingredient of red peppers, deterred oviposition by 95% when present at 320 ppm in the top centimeter of sand (the ovipositional substrate). However, in no-choice conditions 10 mg GCP was not an effective deterrent. Sevana Bird Repellent and Agrigard Insect Repellent both use red pepper as a principal ingredient; at recommended field rates, neither of these materials was an effective ovipositional deterrent either in laboratory or field. Capsaicin-based materials do not appear to be candidates for onion maggot control via behavioral modification.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01014714
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  • 4
    Digitale Medien
    Digitale Medien
    Production of onion fly attractants and ovipositional stimulants by bacterial isolates cultured on onion (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 905-916 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Onion fly ; Delia antiqua ; Diptera ; Anthomyiidae ; Erwinia carotovora varcarotovora ; Klebsiella pneumoniae ; food attractant ; ovipositional stimulant ; dipropyl disulfide ; 2-phenylethanol ; pentanoic acid
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Decomposing onions at certain microbial successional stages produce potent volatile attractants and ovipositional stimulants of the onion fly,Delia antiqua (Diptera: Anthomyiidae). A reproducible source of these compounds was obtained by culturingErwinia carotovora var.carotovora (EC) on sterile onion tissue. In laboratory choice tests, EC-inoculated onion was more attractive thanKlebsiella pneumoniae (KP) cultured on onion, EC cultured on potato (a nonhost of onion fly), or the chemical synthetic baits dipropyl disulfide and an aqueous solution of 2-phenylethanol and pentanoic acid. Onion flies were mildly attracted to potato after inoculation with EC, but females did not accept EC-inoculated potato for oviposition. This work emphasizes that sources of semiochemicals may need to be defined microbiologically as well as physically and chemically.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01015186
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  • 5
    Digitale Medien
    Digitale Medien
    Influence of cage design on precision of tube-trap bioassay for attractants of the onion fly,Delia antiqua (1985)
    Springer
    Journal of chemical ecology 11 (1985), S. 435-440 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Delia (Hylemya) antiqua ; Diptera ; Anthomyiidae ; onion fly ; onion maggot ; tube trap ; insect attractants
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Responses of onion flies,Delia antiqua, to known attractants were measured in the laboratory with a novel tube-trap bioassay. The relative numbers of flies caught in tube traps baited with enzymatic yeast hydrolysate, brewer's yeast, andn-dipropyl disulfide were similar to those obtained previously with cone traps in the field. Changing the shape of the bioassay cage from a cuboid to a cylinder decreased the experimental error obtained from analysis of variance, as did rotating the floor of the circular cage. This bioassay should be useful in evaluating attractants for other insects that orient along the substrate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00989554
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  • 6
    Digitale Medien
    Digitale Medien
    Responses ton-dipropyl disulfide by ovipositing onion flies: Effects of concentration and site of release (1987)
    Springer
    Journal of chemical ecology 13 (1987), S. 1261-1277 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Onion fly ; onion maggot ; Delia antiqua ; Hylemya antiqua ; Diptera ; Anthomyiidae ; host selection ; oviposition ; dipropyl disulfide ; behavior ; herbivore ; plant-insect interactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Onion fly females,Delia antiqua (Diptera: Anthomyiidae) laid the most eggs on ovipositional dishes havingn-dipropyl disulfide (Pr2S2) release rates of 1–6 ng/sec from polyethylene capsules placed beneath a sand substrate. When dipropyl disulfide was released from the wax coating of surrogate foliage rather than from the substrate, ovipositing females again responded differentially to various concentrations, laying more eggs around stems containing 0.075 and 0.089 mg/stem. Factorial combinations of several concentrations released from surrogate foliage and substrate showed that releases from surrogate foliage stimulated four times more egg-laying than releases from the substrate. Females tended to lay more eggs around surrogate stems having Pr2S2 at the base rather than on the upper half of foliage. Observations of individual females performing preovipositional examining behaviors on Pr2S2-treated surrogate stems indicated that females tended to land on the upper portions of the foliage, but after landing, spent most of their time examining areas of soil and surrogate within 1 cm of the soil-surrogate foliage interface. Surrogate stems provide a realistic context for investigating effects of plant chemicals on host-acceptance behaviors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01020553
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