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3551.
  • Ahlberg, Per, et al. (författare)
  • Miaolingian (Cambrian) trilobite biostratigraphy and carbon isotope chemostratigraphy in the Tingskullen drill core, Öland, Sweden
  • 2021
  • Ingår i: Estonian Journal of Earth Sciences. - : Estonian Academy Publishers. - 1736-7557 .- 1736-4728. ; 70:1, s. 18-35
  • Tidskriftsartikel (refereegranskat)abstract
    • The Cambrian succession of the Tingskullen drill core from northern Öland comprises Cambrian Series 2 and Miaolingian (Wuliuan Stage) siliciclastic strata. The major portion of the succession is represented by the Miaolingian Borgholm Formation, which, in ascending order, is subdivided into the Mossberga, Bårstad and Äleklinta members. The Äleklinta Member is barren of body fossils, whereas the Mossberga and Bårstad members are moderately to highly fossiliferous and biostratigraphically reasonably well constrained. Trilobites and agnostoids from the Bårstad Member are indicative of the Acadoparadoxides pinus Zone.The Mossberga Member has not yielded any zonal guide fossils but is tentatively assigned to the Eccaparadoxides insularis Zone. A δ13Corg curve throughout the Borgholm Formation shows a general positive trend up­section without any distinctive excursion, suggesting that the Wuliuan Acadoparadoxides (Baltoparadoxides) oelandicus Superzone (the ‘Oelandicus beds’) of Öland is younger than the negative Redlichiid–Olenellid Extinction Carbon isotope Excursion (ROECE), which is known from near the top of Stage 4 and close to the traditional ‘Lower–Middle Cambrian boundary’ in several parts of the world.
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3552.
  • Ahlberg, Per, et al. (författare)
  • Minnesord Sven Stridsberg
  • 2020
  • Ingår i: Geologiskt forum. - 1104-4721 .- 1104-4721. ; :105
  • Annan publikation (populärvet., debatt m.m.)
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3553.
  • Ahlberg, Per, et al. (författare)
  • Phosphatised olenid trilobites and associated fauna from the Upper Cambrian of Vastergotland, Sweden
  • 2005
  • Ingår i: Acta Palaeontologica Polonica. - 0567-7920. ; 50:3, s. 429-440
  • Tidskriftsartikel (refereegranskat)abstract
    • Secondarily phosphatised olenid trilobites from organic-rich limestones (orsten) in the Furongian (Upper Cambrian) of Vastergotland, south-central Sweden, are described and illustrated. All trilobites originate from the Peltura scarabaeoides Zone and were collected on the western slope of Kinnekulle. Only the dorsal exoskeletons have become secondarily phosphatised, and the ventral appendages are not preserved. Yet the material is otherwise remarkably well preserved and reveals the morphology of the olenid trilobites in greater detail than hitherto known. Species belonging to the genera Ctenopyge, Sphaerophthalmus, Parabolina, and Peltura are identified, and several juvenile specimens are present in the material. The material is disarticulated and fragmentary, and it has only been possible to identify a few specimens to species level. In addition to chaetognaths and conodonts, the trilobites are associated with pelmatozoan columnals, a possible camaroid, and fossils of uncertain affinities. These fossils, along with a probable conulariid fragment from the Peltura minor Zone, are also described and discussed. The presence of a benthic fauna of pelmatozoans, and possible conulariids and camaroids, indicates that at least parts of the Peltura zones were deposited during dysoxic rather than anoxic periods. Moreover, the sea floor must have been firm enough to allow colonisation by sessile organisms.
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3554.
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3555.
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3556.
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3557.
  • Ahlberg, Sebastian, et al. (författare)
  • Many-body effects on tracer particle diffusion with applications for single-protein dynamics on DNA
  • 2015
  • Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 17
  • Tidskriftsartikel (refereegranskat)abstract
    • 30% of the DNA in E. coli bacteria is covered by proteins. Such a high degree of crowding affects the dynamics of generic biological processes (e.g. gene regulation, DNA repair, protein diffusion etc) in ways that are not yet fully understood. In this paper, we theoretically address the diffusion constant of a tracer particle in a one-dimensional system surrounded by impenetrable crowder particles. While the tracer particle always stays on the lattice, crowder particles may unbind to a surrounding bulk and rebind at another, or the same, location. In this scenario we determine how the long time diffusion constant D (after many unbinding events) depends on (i) the unbinding rate of crowder particles k(off), and (ii) crowder particle line density rho, from simulations (using the Gillespie algorithm) and analytical calculations. For small k(off), we find D similar to k(off)/rho(2) when crowder particles do not diffuse on the line, and D similar to root Dk(off)/rho when they are diffusing; D is the free particle diffusion constant. For large k(off), we find agreement with mean-field results which do not depend on k(off). From literature values of k(off) and D, we show that the small k(off) -limit is relevant for in vivo protein diffusion on crowded DNA. Our results apply to single-molecule tracking experiments.
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3558.
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3559.
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3560.
  • Ahlborg, Henrik (författare)
  • Changes in bone mass and skeletal structure in the postmenopausal period.
  • 2003
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The aim of this thesis was to evaluate long-term changes in bone mass and skeletal structure in the forearm in the peri- and postmenopausal period. 156 premenopausal women, at baseline aged 48 years, not taking medications and without disease processes known to interfere with bone metabolism, were followed through menopause by measurements of bone mass and skeletal structure at the cortical site of the distal radius by single photon absorptiometry, on average every second year until age 72. General health and life-style factors were reported, and the postmenopausal serum estradiol level and fragility fractures were noted. Menopause was determined according to the definition established by the World Health Organisation. The age-dependent reduction in bone mineral density accelerated after menopause, with the highest bone loss found during the first 5 years following menopause. Independent of age at menopause, premenopausal women with low, age-specific bone mineral density at age 48 years were likely to have low bone mineral density also at age 64 years. Furthermore, menopause was followed by structural geometrical changes such as endosteal resorption, increasing the medullary cavity, and periosteal apposition, increasing the bone size. Increased periosteal apposition was associated with both increased bone loss and low postmenopausal serum levels of estradiol. The periosteal apposition seemed to partly compensate for the decreased bone strength, caused by the decrease in tissue mineral content. A Strength Index, taking both bone density and skeletal geometry into account, predicted a future fracture of the distal radius. If the structural skeletal changes of the distal radius, with enlargement of the medullary cavity, are a general phenomenon of the diaphyseal bones, this theoretically could have implications for the long-term fixation of a hip prosthesis. Bone loss following menopause was less in physically active than in physically inactive women, so that physically active women had a higher bone mineral density at age 72 than physically inactive women. This suggests that moderate physical activity in the postmenopausal period could possibly be recommended as a strategy to prevent bone loss. Furthermore, the effect of hormone replacement therapy on bone loss after menopause was evaluated in an observational study with 28 women with and 196 women without hormone replacement therapy. Hormone replacement therapy seemed to reduce the rate of bone loss over a period of 23 years, and the longer the duration of the therapy, the less the bone loss.
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