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Schulte Maximilian Jonsson Ragnar Hammar Torun Stendahl Johan Hansson Per-Anders 《European Journal of Forest Research》2022,141(5):865-866
European Journal of Forest Research - 相似文献
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Schulte Maximilian Jonsson Ragnar Hammar Torun Stendahl Johan Hansson Per-Anders 《European Journal of Forest Research》2022,141(5):845-863
European Journal of Forest Research - Climate change mitigation trade-offs between increasing harvests to exploit substitution effects versus accumulating forest carbon sequestration complicate... 相似文献
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Bremle Gudrun Larsson Per Hammar Tommy Helgée Anders Troedsson Bo 《Water, air, and soil pollution》1998,107(1-4):237-250
Remediation of 150 000 m3 of sediment containing400 kg PCB was performed by suction dredging in asmall lake in Sweden in the summers of 1993 and 1994.Upon project completion calculations indicated that97% of the PCB was deposited in a landfill withsubsequent low transport to the surroundings, andthat 2.9 kg was left in the lake sediment.Concentrations of PCB that were measured weekly in thewater leaving the lake were 12 ng/L (geometric mean)during dredging, not exceeding 30 ng/L and notsignificantly higher than in investigations preceedingthe remedial action. The concentration of PCB wasnegatively correlated to water discharge andpositively correlated to water temperature. PCBtransport in the river was correlated to waterdischarge but not to the dredging activity. Duringdredging of the most contaminated part of the lake,the dredging area was screened off by a geotextilesilt curtain that reduced leakage of PCB to the riverdownstream. 相似文献
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Chapman MR Robinson LS Pinkner JS Roth R Heuser J Hammar M Normark S Hultgren SJ 《Science (New York, N.Y.)》2002,295(5556):851-855
Amyloid is associated with debilitating human ailments including Alzheimer's and prion diseases. Biochemical, biophysical, and imaging analyses revealed that fibers produced by Escherichia coli called curli were amyloid. The CsgA curlin subunit, purified in the absence of the CsgB nucleator, adopted a soluble, unstructured form that upon prolonged incubation assembled into fibers that were indistinguishable from curli. In vivo, curli biogenesis was dependent on the nucleation-precipitation machinery requiring the CsgE and CsgF chaperone-like and nucleator proteins, respectively. Unlike eukaryotic amyloid formation, curli biogenesis is a productive pathway requiring a specific assembly machinery. 相似文献
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Leaching of nitrogen (N) and phosphorus (P) through container peatmedium and N and P uptake by seedlings were determined in commercial productionof birch grown with three different types of fertilization. Half of the amountof nutrients was premixed into the peat medium and the other half was appliedasliquid (=fertigated) in the treatment (PF) commonly used in Finland. In twoother treatments all nutrients, either totally (P-VN) or partly (P-N) inslow-release form, were premixed into the peat. Independently of the treatment,the largest proportion (60 to 80%) of total N leached during May and June.During two growing seasons, the amounts of N leached from PF treatments (9 to36kg ha–1) were as large as the amounts of Nleachedfrom P-VN and P-N treatments (24 to 46 kg ha–1).Due to fertigations between container trays, however, the total N load perhectare was greatest in the PF treatments. In the soil water 0.5meter beneaththe container area, the N concentration varied from 10 to 60 mgl–1. The morphological and chemical properties of theseedlings did not differ greatly between treatments. 相似文献
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Jane M Morrell Anders Johannisson Anne-Marie Dalin Linda Hammar Thomas Sandebert Heriberto Rodriguez-Martinez 《Acta veterinaria Scandinavica》2008,50(1):2
Background
Artificial insemination is not as widely used in horses as in other domestic species, such as dairy cattle and pigs, partly because of the wide variation in sperm quality between stallion ejaculates and partly due to decreased fertility following the use of cooled transported spermatozoa. Furthermore, predictive tests for sperm fertilising ability are lacking. The objective of the present study was to assess sperm morphology and chromatin integrity in ejaculates obtained from 11 warmblood breeding stallions in Sweden, and to evaluate the relationship of these parameters to pregnancy rates to investigate the possibility of using these tests predictively.Methods
Aliquots from fortyone ejaculates, obtained as part of the normal semen collection schedule at the Swedish National Stud, were used for morphological analysis by light microscopy, whereas thirtyseven were used for chromatin analysis (SCSA) by flow cytometry. The outcome of inseminations using these ejaculates was made available later in the same year.Results
Ranges for the different parameters were as follows; normal morphology, 27–79.5%; DNA-fragmentation index (DFI), 4.8–19.0%; standard deviation of DNA fragmentation index (SD_DFI) 41.5–98.9, and mean of DNA fragmentation index (mean_DFI), 267.7–319.5. There was considerable variation among stallions, which was statistically significant for all these parameters except for mean_DFI (P < 0.001, P < 0.01, P < 0.001 and P < 0.2 respectively). There was a negative relationship between normal morphology and DFI (P < 0.05), between normal morphology and SD_DFI (P < 0.001), and between normal morphology and mean_DFI (P < 0.05). For specific defects, there was a direct relationship between the incidence of pear-shaped sperm heads and DFI (P < 0.05), and also nuclear pouches and DFI (P < 0.001), indicating that either morphological analysis or chromatin analysis was able to identify abnormalities in spermiogenesis that could compromise DNA-integrity. A positive relationship was found between normal morphology and pregnancy rate following insemination (r = 0.789; P < 0.01) and a negative relationship existed between DFI and pregnancy rate (r = -0.63; P < 0.05). Sperm motility, assessed subjectively, was not related to conception rate.Conclusion
Either or both of the parameters, sperm morphology and sperm chromatin integrity, seem to be useful in predicting the fertilising ability of stallion ejaculates, particularly in determining cases of sub-fertility. 相似文献8.
Friederike Ziegler Sara Hornborg Bridget S Green Ole Ritzau Eigaard Anna K Farmery Linus Hammar Klaas Hartmann Sverker Molander Robert W R Parker Erik Skontorp Hognes Ian Vázquez‐Rowe Anthony D M Smith 《Fish and Fisheries》2016,17(4):1073-1093
Fisheries management and sustainability assessment of fisheries more generally have recently expanded their scope from single‐species stock assessment to ecosystem‐based approaches, aiming to incorporate economic, social and local environmental impacts, while still excluding global‐scale environmental impacts. In parallel, Life Cycle Assessment (LCA) has emerged as a widely used and recommended framework to assess environmental impacts of products, including global‐scale impacts. For over a decade, LCA has been applied to seafood supply chains, leading to new insights into the environmental impact of seafood products. We present insights from seafood LCA research with particular focus on evaluating fisheries management, which strongly influences the environmental impact of seafood products. Further, we suggest tangible ways in which LCA could be taken up in management. By identifying trade‐offs, LCA can be a useful decision support tool and avoids problem shifting from one concern (or activity) to another. The integrated, product‐based and quantitative perspective brought by LCA could complement existing tools. One example is to follow up fuel use of fishing, as the production and combustion of fuel used dominates overall results for various types of environmental impacts of seafood products, and is also often linked to biological impacts of fishing. Reducing the fuel use of fisheries is therefore effective to reduce overall impacts. Allocating fishing rights based on environmental performance could likewise facilitate the transition to low‐impact fisheries. Taking these steps in an open dialogue between fishers, managers, industry, NGOs and consumers would enable more targeted progress towards sustainable fisheries. 相似文献
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