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- Bjorneholm, O, et al.
(författare)
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Between vapor and ice: Free water clusters studied by core level spectroscopy
- 1999
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Ingår i: JOURNAL OF CHEMICAL PHYSICS. - : AMER INST PHYSICS. - 0021-9606. ; 111:2, s. 546-550
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Core level x-ray absorption and photoemission spectra of free water clusters are presented. Core and valence photoemission spectra show a weak but gradual change with cluster size. Comparisons to spectra of the isolated molecule and solid ice indicate tha
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- Erlinge, David, et al.
(författare)
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Phenotype changes of the vascular smooth muscle cell regulate P2 receptor expression as measured by quantitative RT-PCR
- 1998
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Ingår i: Biochemical and Biophysical Research Communications. - : Elsevier BV. - 1090-2104 .- 0006-291X. ; 248:3, s. 864-870
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Tidskriftsartikel (refereegranskat)abstract
- Studies using selective agonists have suggested that the contractile effect of extracellular nucleotides, such as ATP and UTP, in blood vessels is mediated mainly by P2X1 receptors with a smaller contribution of P2Y receptors while the mitogenic effect is mediated by P2Y (P2Y1, P2Y2, P2Y4, and P2Y6) receptors with no effect of P2X1 receptors. This indicates a difference in P2 receptor expression between the contractile and the synthetic phenotype of the SMC. To measure the expression of mRNA for these receptors a competitive RT-PCR assay was developed that utilised synthetic RNA-competitors allowing determination of the number of mRNA copies for each receptor in the samples. In the synthetic phenotype the mitogenic P2Y1 and P2Y2 receptor transcripts were upregulated by 342- and 8-fold, respectively, while the contractile P2X1 receptor is totally downregulated and the P2Y4 and P2Y6 receptors were unchanged. This plasticity of the receptor expression may be important in the transition from the contractile to the synthetic SMC phenotype.
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- Marklund, S, et al.
(författare)
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Molecular basis for the dominant white phenotype in the domestic pig.
- 1998
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Ingår i: Genome research. - 1088-9051. ; 8:8, s. 826-33
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Tidskriftsartikel (refereegranskat)abstract
- The change of phenotypic traits in domestic animals and crops as a response to selective breeding mimics the much slower evolutionary change in natural populations. Here, we describe that the dominant white phenotype in domestic pigs is caused by two mutations in the KIT gene encoding the mast/stem cell growth factor receptor (MGF), one gene duplication associated with a partially dominant phenotype and a splice mutation in one of the copies leading to the fully dominant allele. The splice mutation is a G to A substitution in the first nucleotide of intron 17 and leads to skipping of exon 17. The duplication is most likely a regulatory mutation affecting KIT expression, whereas the splice mutation is expected to cause a receptor with impaired or absent tyrosine kinase activity. Immunocytochemistry showed that this variant form is expressed in 17- to 19-day-old pig embryos. Hundreds of millions of white pigs around the world are assumed to be heterozygous or homozygous for the two mutations. [The EMBL accession numbers for porcine KIT1*0101, KIT1*0202, KIT2*0202, and KIT2*0101 are AJ223228-AJ223231, respectively.]
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- Nicoletti, F, et al.
(författare)
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Early prophylaxis with recombinant human interleukin-11 prevents spontaneous diabetes in NOD mice
- 1999
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Ingår i: Diabetes. - : American Diabetes Association. - 0012-1797 .- 1939-327X. ; 48:12, s. 2333-2339
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Tidskriftsartikel (refereegranskat)abstract
- We evaluated the effects of recombinant human (rh) interleukin (IL)-11 on the development of spontaneous and cyclophosphamide-induced diabetes in female NOD mice. Prolonged treatment with rhIL-11 10 microg i.p. five consecutive times a week between the 4th and 22nd weeks of age significantly suppressed both development and cumulative incidence of type 1 diabetes. Disease protection was transient because most of the animals developed type 1 diabetes within 3 months of treatment withdrawal. In contrast, rhIL-11 failed to prevent type 1 diabetes when administered for the first time to euglycemic 18-week-old NOD mice. Most likely, this discrepancy was not due to age-dependent differences in the immunological responses of NOD mice to rhIL-11 because staphylococcus aureus enterotoxin B-induced tumor necrosis factor (TNF) and IL-12 production were equally suppressed by rhIL-11 in 12- and 25-week-old NOD mice. Relative to controls, NOD mice pretreated with rhIL-11 also showed significantly diminished blood levels of TNF, interferon-gamma, and IL-12 induced by anti-CD3 antibody and/or lipopolysaccharide. The results demonstrate that rhIL-11 has powerful anti-inflammatory effects that are capable of down-regulating early immunodiabetogenic pathways in NOD mice.
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