SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Svensson Per) ;lar1:(su)"

Sökning: WFRF:(Svensson Per) > Stockholms universitet

  • Resultat 1-10 av 40
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  •  
2.
  • Amombo Noa, Francoise Mystere, 1988, et al. (författare)
  • Metal-Organic Frameworks with Hexakis(4-carboxyphenyl)benzene: Extensions to Reticular Chemistry and Introducing Foldable Nets
  • 2020
  • Ingår i: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 1520-5126 .- 0002-7863. ; 142:20, s. 9471-9481
  • Tidskriftsartikel (refereegranskat)abstract
    • Nine metal-organic frameworks have been prepared with the hexagon-shaped linker 1,2,3,4,5,6-hexakis(4-carboxyphenyl)-benzene (H(6)cpb) by solvothermal reactions in dimethylformamide (dmf) or dimethylacetamide (dmac) with acetic acid or formic acid as modulators: [Bi-2(cpb)(acetato)(2)(dmf)(2)]center dot 2dmf CTH-6 forms a rtl-net; 2(H2NMe2)[Cu-2(cpb)] CTH-7 forms a kgd-net; [Fe-4(cpb)-(acetato)(2)(dmf)(4)] CTH-8 and [Co-4(cpb)(acetato)(2)(dmf)(4)] CTH-9 are isostructural and form yav-nets; 2(HNEt3)[Fe-2(cpb)] CTH-10 and the two polymorphs of 2(H2NMe2)[Zn-2(cpb)]center dot 1.5dmac, Zn-MOF-888 and CTH-11, show kgd-nets; [Cu-2(cpb)-(acetato)(2)(dmf)(2)]center dot 2dmf, CTH-12, forms a mixed coordination and hydrogen-bonded sql-net; and 2(H2NMe2)[Zn-2(cpb)] CTH-13, a similarly mixed yav-net. Surface area values (Brunauer-Emmett-Teller, BET) range from 34 m(2) g(-1) for CTH-12 to 303 m(2) g(-1) for CTH-9 for samples activated at 120 degrees C in dynamic vacuum. All compounds show normal (10-fold higher) molar CO2 versus N-2 uptake at 298 K, except the 19-fold CO2 uptake for CTH-12 containing Cu(II) dinuclear paddle-wheels. We also show how perfect hexagons and triangles can combine to a new 3D topology laf, a model of which gave us the idea of foldable network topologies, as the laf-net can fold into a 2D form while retaining the local geometry around each vertex. Other foldable nets identified are cds, cds-a, ths, sqc163, clh, jem, and tfc covering the basic polygons and their combinations. The impact of this concept on "breathing" MOFs is discussed. I-2 sorption, both from gas phase and from MeOH solution, into CTH-7 were studied by time of flight secondary ion mass spectrometry (ToF-SIMS) on dried crystals. I-2 was shown to have penetrated the crystals, as layers were consecutively peeled off by the ion beam. We suggest ToF-SIMS to be a method for studying sorption depth profiles of MOFs.
  •  
3.
  •  
4.
  •  
5.
  • Bastviken, David, et al. (författare)
  • Chloride retention and release in a boreal forest soil: effects of soil water residence time and nitrogen and chloride loads
  • 2006
  • Ingår i: Environmental Science and Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 40:9, s. 2977-2982
  • Tidskriftsartikel (refereegranskat)abstract
    • The common assumption that chloride (Cl-) is conservative in soils and can be used as a groundwater tracer is currently being questioned, and an increasing number of studies indicate that Cl- can be retained in soils. We performed lysimeter experiments with soil from a coniferous forest in southeast Sweden to determine whether pore water residence time and nitrogen and Cl- loads affected Cl- retention. Over the first 42 days there was a net retention of Cl- with retention rates averaging 3.1 mg Cl- m-2 d-1 (68% of the added Cl- retained over 42 days). Thereafter, a net release of Cl- at similar rates was observed for the remaining experimental period (85 d). Longer soil water residence time and higher Cl- load gave higher initial retention and subsequent release rates than shorter residence time and lower Cl- load did. Nitrogen load did not affect Cl transformation rates. This study indicates that simultaneous retention and release of Cl- can occur in soils, and that rates may be considerable relative to the load. The retention of Cl- observed was probably due to chlorination of soil organic matter or ion exchange. The cause of the shift between net retention and net release is unclear, but we hypothesize that the presence of O2 or the presence of microbially available organic matter regulates Cl- retention and release rates.
  •  
6.
  • Bastviken, David, et al. (författare)
  • Chloride retention in forest soil by microbial uptake and by natural chlorination of organic matter
  • 2007
  • Ingår i: Geochimica Cosmochimica Acta. - : Elsevier BV. - 0016-7037 .- 1872-9533. ; 71:13, s. 3182-3192
  • Tidskriftsartikel (refereegranskat)abstract
    • Inorganic chlorine (i.e. chloride; Cl-in) is generally considered inert in soil and is often used as a tracer of soil and ground water movements. However, recent studies indicate that substantial retention or release of Cl-in can occur in soil, but the rates and processes responsible under different environmental conditions are largely unknown. We performed Cl-36 tracer experiments which indicated that short-term microbial uptake and release of Cl-in, in combination with more long-term natural formation of chlorinated organic matter (Cl-org), caused Cl-in imbalances in coniferous forest soil. Extensive microbial uptake and release of Cl-in occurred over short time scales, and were probably associated with changes in environmental conditions. Up to 24% of the initially available Clin within pore water was retained by microbial uptake within a week in our experiments, but most of this Cl-in, was released to the pore water again within a month, probably associated with decreasing microbial populations. The natural formation of Clorg resulted in a net immobilization of 4% of the initial pore water Clin over four months. If this rate is representative for the area where soil was collected, Clorg formation would correspond to a conversion of 25% of the yearly wet deposition of Cl-in. The study illustrates the potential of two Clin retaining processes in addition to those previously addressed elsewhere (e.g. uptake of chloride by vegetation). Hence, several processes operating at different time scales and with different regulation mechanisms can cause Clin imbalances in soil. Altogether, the results of the present study (1) provide evidence that Cl-in cannot be assumed to be inert in soil, (2) show that microbial exchange can regulate pore water Cl-in, concentrations and (3) confirm the controversial idea of substantial natural chlorination of soil organic matter.
  •  
7.
  • Bastviken, David, et al. (författare)
  • Temperature Sensitivity Indicates That Chlorination of Organic Matter in Forest Soil Is Primarily Biotic
  • 2009
  • Ingår i: Environmental Science and Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 43:10, s. 3569-3573
  • Tidskriftsartikel (refereegranskat)abstract
    • Old assumptions that chloride is inert and that most chlorinated organic matter in soils is anthropogenic have been challenged by findings of naturally formed organochlorines. Such natural chlorination has been recognized for several decades, but there are still very few measurements of chlorination rates or estimates of the quantitative importance of terrestrial chlorine transformations. While much is known about the formation of specific compounds, bulk chlorination remains poorly understood in terms of mechanisms and effects of environmental factors. We quantified bulk chlorination rates in coniferous forest soil using Cl-36-chloride in tracer experiments at different temperatures and with and without molecular oxygen (O-2). Chlorination was enhanced by the presence of O-2 and had a temperature optimum at 20 degrees C. Minimum rates were found at high temperatures (50 degrees C) or under anoxic conditions. The results indicate (1) that most of the chlorination between 4 and 40 degrees C was biotic and driven by O-2 dependent enzymes, and (2) that there is also slower background chlorination occurring under anoxic conditions at 20 degrees C and under oxic conditions at 50 degrees C. Hence, while oxic and biotic chlorination clearly dominated, chlorination by other processes including possible abiotic reactions was also detected.
  •  
8.
  • Borg, Per, 1943- (författare)
  • Systemskifte : En studie av tröghet vid fyra brytpunkter inom svensk välfärdspolitik
  • 2004
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The purpose of this dissertation is to describe, explain and understand how slowness appeared when some decisions were made in the area of welfare policy and how this slowness was eliminated. The study focuses on major changes. It is argued that such changes follow another logic than small gradual adjustments. Four breaking points have been selected for a deeper analysis: the pension policy decisions of 1913 and 1994 and the housing policy decisions of 1935 and 1992. These decisions led to the emergence of fundamentally new institutional structures concerning the relation between the central government and the citizens. The study shows that an established institutional structure within a welfare policy area generated mental constructs and decision rules that governed political decision-making. This governance resulted in slowness in the form of lengthy decision-making processes. The fundamental institutional structure was being altered only when the mental constructs were broken down. A common feature was that the decisions were first made when discontent with the prevailing order became so strong that it overwhelmed the fear of a new institutional structure. The general tendency was also to shape the fundamental changes in relation to the citizens so that the changes could be portrayed as small. The established mental constructs are the determining explanation for slowness. The interest organizations played a secondary role, as their interests are shaped in accordance with the mental constructs. Their resistance was declined at the same time when the mental constructs were broken down. The individuals – agents of change – that constantly worked for the change of system in reality appear to be significantly more interesting than hindering organization. Their influence showed a recurring pattern.
  •  
9.
  • Díez-del-Molino, David, et al. (författare)
  • Population genomics reveals lack of greater white-fronted introgression into the Swedish lesser white-fronted goose
  • 2020
  • Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 10:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Interspecific introgression is considered a potential threat to endangered taxa. One example where this has had a major impact on conservation policy is the lesser white-fronted goose (LWfG). After a dramatic decline in Sweden, captive breeding birds were released between 1981–1999 with the aim to reinforce the population. However, the detection of greater white-fronted goose (GWfG) mitochondrial DNA in the LWfG breeding stock led to the release program being dismantled, even though the presence of GWfG introgression in the actual wild Swedish LWfG population was never documented. To examine this, we sequenced the complete genomes of 21 LWfG birds from the Swedish, Russian and Norwegian populations, and compared these with genomes from other goose species, including the GWfG. We found no evidence of interspecific introgression into the wild Swedish LWfG population in either nuclear genomic or mitochondrial data. Moreover, Swedish LWfG birds are genetically distinct from the Russian and Norwegian populations and display comparatively low genomic diversity and high levels of inbreeding. Our findings highlight the utility of genomic approaches in providing scientific evidence that can help improve conservation management as well as policies for breeding and reinforcement programmes.
  •  
10.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-10 av 40
Typ av publikation
tidskriftsartikel (27)
konferensbidrag (4)
doktorsavhandling (3)
bok (2)
annan publikation (2)
rapport (1)
visa fler...
bokkapitel (1)
visa färre...
Typ av innehåll
refereegranskat (31)
övrigt vetenskapligt/konstnärligt (8)
populärvet., debatt m.m. (1)
Författare/redaktör
Carlbring, Per (8)
Bastviken, David (4)
Käll, Per-Olov (4)
Andersson, Gerhard (4)
Svensson, A (3)
Öberg, Gunilla (3)
visa fler...
Sandén, Per (3)
Stam, Per, 1964- (2)
Andersson, G (2)
Svensson, Erik (2)
Woltjer, Rogier (1)
Gyllenstrand, Niclas (1)
Mörk, Eva, 1971- (1)
Almkvist, Ove (1)
Svensson, Leif (1)
Helleday, Thomas (1)
Wahlund, Lars-Olof (1)
Andersson, Tommy (1)
Larsson, Per Tomas (1)
Persson, Per (1)
Öhrström, Lars, 1963 (1)
Wågberg, Lars (1)
Kere, Juha (1)
Unneberg, Per (1)
Tjernström, Michael (1)
Widmalm, Göran (1)
Malmberg, Per, 1974 (1)
Larsson, Magnus (1)
Loseva, Olga (1)
Boschloo, Gerrit (1)
Hagfeldt, Anders (1)
Salazar-Alvarez, Ger ... (1)
Winblad, Bengt (1)
Hentati Sundberg, Jo ... (1)
Artursson, Per (1)
Hammarström, Lars G. ... (1)
Ernfors, Patrik (1)
Svensson, Mikael (1)
Svensson, Thomas (1)
Svensson, Lennart (1)
Englund, Boel (1)
Ledin, Per, 1962- (1)
Cheung, Ocean (1)
Svensson, Richard (1)
Jenmalm Jensen, Anni ... (1)
Lundbäck, Thomas (1)
Nilsson, Mattias (1)
Magnusson, Måns (1)
Mårtensson, Jerker, ... (1)
Andersson, Gerhard, ... (1)
visa färre...
Lärosäte
Linköpings universitet (7)
Karolinska Institutet (5)
Uppsala universitet (4)
Chalmers tekniska högskola (2)
Örebro universitet (1)
visa fler...
RISE (1)
Naturhistoriska riksmuseet (1)
visa färre...
Språk
Engelska (30)
Svenska (9)
Odefinierat språk (1)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (19)
Samhällsvetenskap (12)
Medicin och hälsovetenskap (5)
Humaniora (5)
Teknik (2)

År

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy