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Träfflista för sökning "WFRF:(SUNDBERG J) srt2:(1995-1999)"

Sökning: WFRF:(SUNDBERG J) > (1995-1999)

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  • Ingemarsson, A, et al. (författare)
  • Reaction cross sections for 65 MeV protons on targets from Be-9 to Pb-208
  • 1999
  • Ingår i: NUCLEAR PHYSICS A. - : ELSEVIER SCIENCE BV. - 0375-9474. ; 653:4, s. 341-354
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Reaction cross sections for 65.5 MeV protons have been measured for Be-9, C-12, O-16, Si-28, Ca-40, Ni-58.60, Sn-112.116.118.120.124, and Pb-208. The results are compared with optical model predictions using relativistic global potentials. (C) 1999 Elsevi
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  • Kuhl, Patricia K, et al. (författare)
  • Cross-language analysis of phonetic units in language addressed to infants.
  • 1997
  • Ingår i: Science. - 0036-8075. ; 277:5326, s. 684-6
  • Tidskriftsartikel (refereegranskat)abstract
    • In the early months of life, infants acquire information about the phonetic properties of their native language simply by listening to adults speak. The acoustic properties of phonetic units in language input to young infants in the United States, Russia, and Sweden were examined. In all three countries, mothers addressing their infants produced acoustically more extreme vowels than they did when addressing adults, resulting in a "stretching" of vowel space. The findings show that language input to infants provides exceptionally well-specified information about the linguistic units that form the building blocks for words.
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  • SUNDBERG, J (författare)
  • FEMALE YELLOWHAMMERS (EMBERIZA-CITRINELLA) PREFER YELLOWER MALES - A LABORATORY EXPERIMENT
  • 1995
  • Ingår i: BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY. - : SPRINGER VERLAG. - 0340-5443. ; 37:4, s. 275-282
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The importance of male plumage coloration as a signal of male dominance and a cue for female choice in the monogamous yellowhammer, Emberiza citrinella, was tested in two sets of experiments in an indoor aviary. Dominance was tested by introducing two ind
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  • Sundberg, J, et al. (författare)
  • Kinetics of methylmercury and inorganic mercury in lactating and nonlactating mice.
  • 1998
  • Ingår i: Toxicology and Applied Pharmacology. - : Elsevier BV. - 0041-008X .- 1096-0333. ; 151:2, s. 319-29
  • Tidskriftsartikel (refereegranskat)abstract
    • The elimination of mercury was followed for 9 days (Days 10-19 of lactation) in milk and/or 21 days in blood and plasma of lactating and nonlactating mice administered a single iv injection of either 203Hg-labeled methylmercuric chloride or 203Hg-labeled mercuric chloride (0.5 mg Hg/kg body wt). Demethylation of methylmercury to inorganic mercury was taken into consideration by analyzing the data with a combined pharmacokinetic model based on the assumption of constant blood plasma ratios for methylmercury and inorganic mercury. A three-compartment model fitted the blood and plasma concentrations vs time profiles for both compounds. Plasma clearance and volume of distribution at steady state for methylmercury were 95. 3 ml/h/kg and 18,500 ml/kg, respectively, in lactating mice, and significantly higher than in nonlactating mice with values of 47.1 ml/h/kg and 9400 ml/kg, respectively. The terminal half-lives of methylmercury in plasma were similar, 170 h in lactating and 158 h in nonlactating mice. No differences were observed between the pharmacokinetic parameters in lactating and nonlactating mice administered inorganic mercury. The lactational transfer of mercury was more efficient following administration of inorganic mercury than after administration of methylmercury, with a five times higher peak concentration in milk, higher milk:plasma concentration ratios, and 8% of the administered dose excreted in milk compared with 4% for methylmercury. Mercury concentrations in milk following an iv dose of inorganic mercury decreased with a terminal half-life of 107 h, whereas after administration of methylmercury, the concentration of total mercury in milk remained at an almost constant level during the whole period of investigation. There was a nonlinear relationship between mercury in milk and plasma following inorganic mercury administration. It is suggested that inorganic mercury enters the mammary gland by a carrier-mediated transport system, which is saturated at high plasma levels of inorganic mercury. The present study shows that physiological changes during lactation alter the pharmacokinetics for methylmercury in mice but not for inorganic mercury.
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  • Sundberg, J, et al. (författare)
  • Lactational exposure and neonatal kinetics of methylmercury and inorganic mercury in mice.
  • 1999
  • Ingår i: Toxicology and Applied Pharmacology. - : Elsevier BV. - 0041-008X .- 1096-0333. ; 154:2, s. 160-9
  • Tidskriftsartikel (refereegranskat)abstract
    • The concentration of mercury in milk and the distribution pattern in the sucking pup was followed over time after administration of a single iv injection of 0.5 mg/kg body wt of 203Hg-labeled methylmercuric chloride or mercuric chloride to lactating mice on Day 10 of lactation. Mercury concentrations in milk of the dams and in whole body, blood, plasma, GI-tract, liver, kidneys, and brain of the offspring were followed up to 11 days after dosing (until lactational Day 21). Following the inorganic mercury dose to the dams, most of the mercury in milk was delivered to the pups during the first 24 h, but the maximum mercury concentration in plasma and tissues of pups was not reached until 7 days after dosing, indicating a prolonged absorption of inorganic mercury in the sucking pup. Pups of dams given methylmercury were exposed to a much lower and constant mercury concentration in milk. The estimated accumulated mercury dose via milk per pup of dams given methylmercury was less than half of that estimated after the inorganic mercury dose. When the accumulated dose via milk from methylmercury-exposed dams was compared to the amount of mercury in pup's carcass (whole body minus GI-tract including content), it was revealed that almost all mercury delivered via milk was absorbed, and that the suckling pups had a very low elimination of mercury until lactational Day 17. Lactational exposure following a maternal methylmercury or inorganic mercury dose resulted in almost similar mercury concentrations in liver, kidneys, and plasma of the suckling, but higher concentrations in brain (as most 14 times) and also twice as high mercury body burden in the methylmercury group. Thus, differences in kinetics indicate that lactational exposure of methylmercury is a greater hazard for the breast-fed infant than inorganic mercury.
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  • Sundberg, J, et al. (författare)
  • Old, colourful male yellowhammers, Emberiza citrinella, benefit from extra-pair copulations
  • 1996
  • Ingår i: ANIMAL BEHAVIOUR. - : ACADEMIC PRESS LTD. - 0003-3472. ; 52, s. 113-122
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The frequency of extra-pair paternity was determined in broods of the yellowhammer using single-locus DNA fingerprinting. Of 32 analysed clutches, 69% contained at least one extra-pair young. Out of 123 nestlings, 37% were extra-pair sired young. The extr
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  • Sundberg, J (författare)
  • Parasites, plumage coloration and reproductive success in the yellowhammer, Emberiza citrinella
  • 1995
  • Ingår i: OIKOS. - : MUNKSGAARD INT PUBL LTD. - 0030-1299. ; 74:2, s. 331-339
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The prevalence and intensity of haematozoan parasites, with special emphasis on Haemoproteus coatneyi, was studied in relation to male plumage coloration, and reproductive success in a population of yellowhammers (Emberiza citrinella). Parasite prevalence
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  • Sundberg, Per, et al. (författare)
  • There is no support for Jensen's hypothesis of nemerteans as ancestors to the vertebrates
  • 1998
  • Ingår i: Hydrobiologia. - 0018-8158 .- 1573-5117. ; 365:1, s. 47-54
  • Tidskriftsartikel (refereegranskat)abstract
    • Nemerteans (phylum Nemertea) have been viewed by mostzoologists as descended from, or closely related to,the flatworms. This view is based mainly on theirsupposedly acoelomate body. Their ancestry, however,is a point of controversy and there is evidence for acoelomate, protostomous origin. Notwithstanding thesedifferent views, most zoologists consider nemerteansto be phylogenetically distant from the chordates.Four authors (Hubrecht, Macfarlane, Jensen, Willmer),however, have postulated that nemerteans instead areclosely related to the chordates and that they sharea most recent common ancestor with the vertebrates. We argue that this view is based on a flawed view ofhomology and of seeing evolution as a series ofprogressions, which has no support in modernevolutionary thinking. Since there are nomorphological synapomorphies supporting aChordata-Nemertea clade, these authors instead guesswhat characteristics in extant nemerteans gave rise tocharacters observed in recent chordates. For example,they propose that the nemertean proboscis sheath hasevolved into the notochord. This is mere speculation,lacking testable propositions and is hence void ofinformation, and thus becomes futile in our view. However, the idea of a nemertean-vertebrate sisterrelationship as such is a testable hypotheses, and wetest it by applying the parsimony criterion to a setof morphological characters, and a set of molecular(the 18S rRNA gene) characters. Both tests reject thehypothesis.
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  • vanDoorslaer, E, et al. (författare)
  • Income-related inequalities in health: Some international comparisons
  • 1997
  • Ingår i: JOURNAL OF HEALTH ECONOMICS. - : ELSEVIER SCIENCE BV. - 0167-6296. ; 16:1, s. 93-112
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • This paper presents evidence on income-related inequalities in self-assessed health in nine industrialized countries. Health interview survey data were used to construct concentration curves of self-assessed health, measured as a latent variable. Inequali
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