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| 19. |
- Bergstrom, H, et al.
(författare)
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Detection of carbon using amplified laser-induced fluorescence
- 1989
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Ingår i: Chemical Physics Letters. - 0009-2614. ; 155, s. 27-31
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Tidskriftsartikel (refereegranskat)abstract
- Radiative lifetimes and stimulated emission have been studied in two-photon-excited carbon atoms. A strong fluorescence enhancement was detected in the direction of the exciting laser beam. Rate equations for the energy levels involved have been calculated in order to obtain number densities from the emitted light. Lifetimes were measured for the 2p3p 3p and 3D states and for the A 3[Pi]g state of the C2 molecule.
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| 20. |
- Bergstrom, H, et al.
(författare)
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Investigations of radiative lifetimes in the 3p 5p configuration of neutral silicon
- 1989
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Ingår i: Zeitschrift für Physik D Atoms, Molecules and Clusters. - 0178-7683. ; 13:1, s. 29-31
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Tidskriftsartikel (refereegranskat)abstract
- Lifetimes for the3S1,3P0, 1, 2 and3D1, 2, 3 states in the 3s23p5p configuration of silicon have been determined using stepwise dye laser excitation and time resolved detection. A comparison is made with theoretical values, calculated using multi-configuration Hartree-Fock wavefunctions. Laser-evaporation was used to produce free silicon atoms by focusing a Nd: YAG laser on a rotating silicon target.
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- Biörnstad, Margareta, 1928-2019
(författare)
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Riksintressen i ett 20-årigt perspektiv
- 1990
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Ingår i: Kulturmiljövård. - Stockholm : Riksantikvarieämbetet. - 1100-4800. ; [15]:2, s. 1-8
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Tidskriftsartikel (populärvet., debatt m.m.)
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- Hedner, Jan A, 1953, et al.
(författare)
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Effects of TRH and TRH analogues on the central regulation of breathing in the rat.
- 1983
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Ingår i: Acta physiologica Scandinavica. - : Wiley. - 0001-6772 .- 1365-201X. ; 117:3, s. 427-37
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Tidskriftsartikel (refereegranskat)abstract
- Respiratory activity was studied in rats during light halothane anesthesia. Thyrotropin releasing hormone (TRH) and two TRH analogues: the desamidated form (TRH-OH) and gamma-butyrolactone-gamma-carbonyl-L-histidyl-L-prolinamide citrate (DN 1417) were administered intracerebroventricularly. TRH 0.5-5 micrograms induced a marked tachypnoea with a rapid onset and a duration of at least 20 min. DN 1417, a potent analogue of TRH with a very low TSH (thyroid stimulating hormone) releasing activity was more effective in stimulating respiratory frequency, while TRH-OH, regarded to have neither TSH releasing nor extra hypothalamic effects, at equimolar doses was unable to induce any changes in the respiratory pattern. When TRH was given into the fourth ventricle the dose response curve was slightly shifted to the left. In experiments employing the occluded breath technique, P0.1 was increased in the same magnitude as the mean inspiratory flow (VT/T1). The results also indicated an increase in the gain of the inflation reflex loop whereas the central bulbopontine setting for T1 and TTOT were not significantly changed. Local injection of TRH into the nucleus tractus solitarii induced a stimulation of respiratory frequency which was slower in onset compared to the response seen after injection into the lateral or fourth ventricles. Concomitantly to the respiratory changes, i.c.v. TRH injection induced a hypocarbia and an alkalosis. No changes in blood pressure or heart rate were seen. The respiratory stimulant effect of TRH could be potentiated by pretreatment with naloxone, methylatropine or a low dose of GABA. Haloperidol or propranolol did not significantly change the respiratory effects of TRH, while reserpine pretreatment seemed to blunt some of the ventilatory effects of TRH. It seems likely that TRH has few direct effects on brain stem neurones involved in the central regulation of respiration, but the main effects seem to be elicited in areas rostral to the brain stem. The respiratory stimulating effect of TRH is unrelated to TSH. Furthermore, other neurotransmitter systems might also be involved in modulation of the respiratory stimulation evoked by TRH.
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- HOVI, M, et al.
(författare)
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LEK CENTER ATTRACTS BLACK GROUSE FEMALES
- 1994
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Ingår i: Proceedings of the Royal Society of London. Biological Sciences. - : The Royal Society. - 0962-8452 .- 1471-2954. ; 258:1353, s. 303-305
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Tidskriftsartikel (refereegranskat)
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- Håkansson, H., et al.
(författare)
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In vivo and in vitro toxicity of fractionated fish lipids, with particular regard to their content of chlorinated organic compounds
- 1991
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Ingår i: Pharmacology and Toxicology. - : Wiley. - 0901-9928 .- 1600-0773. ; 69:6, s. 459-471
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Tidskriftsartikel (refereegranskat)abstract
- Six different lipid matrices (the intact lipid (IL), four lipid fractions with different polarity, and the free fatty acids (FFAs) obtained by hydrolysis of the triacylglycerol (TAG) containing fraction) were obtained from salmon (Salmo salar) and eel (Anguilla anguilla), each collected at a contaminated and a comparatively uncontaminated catch site along the coast of Scandinavia. The lipid matrices were studied in toxicological test systems representing various biological functions of different organ systems from several species and trophic levels. The results were evaluated with particular respect to the concentrations of extractable organically bound chlorine (EOCl) in the matrices tested. In some test systems, the specimens with a higher EOCl concentration appeared to be more toxic. For example, the TAG containing fraction (F2) from Idefjord eel, having a higher EOCl content than F2 from Oslofjord eel, reduced the number and hatchability of eggs laid by zebrafish. Both IL and F2 of Idefjord eel increased mortality and reduced the oxygen/nitrogen-ratio in blue mussels. Non-polar compounds (F1) from Bothnian Sea salmon induced 7-ethoxyresurofin O-deethylase (EROD) activity in rainbow trout hepatocytes, whereas F1 from Senja salmon did not. F1 from Bothnian Sea salmon also reduced the number of T-cells in foetal mouse thymus anlagen in vitro compared with the cell number in anlagen exposed to F1 from Senja salmon. A positive correlation between EOCl concentration and test response was found for EROD activity in rainbow trout hepatocytes and for ATP-leakage in Erlich ascites tumour cells when testing the phospolipid containing fraction (F4). However, in most test systems the fish oils, irrespective of EOCl content, were of low toxicity, and the observed effects need to be verified in future studies.
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- Illert, M., et al.
(författare)
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Integration in descending motor pathways controlling the forelimb in the cat - 7. Effects from the reticular formation on C3-C4 propriospinal neurones
- 1981
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Ingår i: Experimental Brain Research. - 0014-4819 .- 1432-1106. ; 42, s. 269-281
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Tidskriftsartikel (refereegranskat)abstract
- Effects of stimulation in the medullary reticular formation (RF) on C3-C4 propriospinal neurones (PNs) were investigated in two series of experiments: (1) indirectly by analyzing how propriospinal transmission to forelimb motoneurones is modified by reticular stimuli; (2) directly by intracellular recording from C3-C4 neurones, which were identified as propriospinal by their antidromic activation from the C6 segment. Propriospinally mediated disynaptic EPSPs evoked in motoneurones from the pyramid (Pyr) and the red nucleus (NR) were effectively facilitated by conditioning stimulation in the RF with a time course of facilitation indicating monosynaptic linkage to the PNs. Propriospinally mediated trisynaptic IPSPs were facilitated less regularly and sometimes instead depressed by conditioning stimulation in the RF. The depression is at least partly due to inhibition of the first order PNs. Recording from C3-C4 PNs revealed that many of them were excited or inhibited by single stimuli in the RF. The brief latency of the EPSPs evoked in these neurones shows monosynaptic linkage from fast reticulospinal fibres. Some IPSPs were similarly monosynaptically evoked from fast fibres and observations are presented suggesting that longer latency IPSPs are monosynaptically mediated by slower fibres. Facilitation of propriospinal transmission to motoneurones as well as the EPSPs and IPSPs in PNs were evoked from a region within or close to the nucleus reticularis gigantocellularis. Convergence of monosynaptic EPSPs from Pyr, NR, tectum, and RF was common in C3-C4 PNs. Linear summation of the EPSPs from RF with those evoked from cortico-, rubro-, or tectospinal tracts shows that the former are not due to stimulation of collaterals which the latter tracts may have in RF. Mediation of the EPSPs and IPSPs by descending, rather than by antidromically activated ascending fibres, was indicated by temporal facilitation produced by RF stimuli, subliminal for evoking monosynaptic PSPs in the PNs. Stimulation of the labyrinth did not evoke disynaptic PSPs in any of the PNs investigated. It is concluded that the C3-C4 PNs projecting to forelimb motoneurones can be excited not only from the cortico-, rubro-, and tectospinal tracts (Illert et al. 1977, 1978) but also by reticulospinal fibres. © 1981 Springer-Verlag.
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- Lundberg, Bengt A.
(författare)
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Att fotografera runstenar
- 1988
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Ingår i: Fornvännen. - 0015-7813 .- 1404-9430. ; , s. 98-103
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 38. |
- Lundberg, Bengt, et al.
(författare)
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Nonlinear dissipative spring mass model for a percussive drill rod joint of the coupling sleeve type
- 1989
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Ingår i: International Journal of Impact Engineering. - 0734-743X .- 1879-3509. ; 8:4, s. 303-313
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Tidskriftsartikel (refereegranskat)abstract
- A nonlinear dissipative spring mass (NDSM) model for a percussive drill rod joint of the coupling sleeve (CS) type is established. Such a joint consists of a cylindrical coupling sleeve with internal thread which connects two drill rods with external threads at their ends. The model disregards wave motion in the coupling sleeve but accounts for axial mobility of the sleeve relative to the rods. This mobility is due to local deformation and slip of the threads. The model is characterized by the mass of the sleeve and by three parameters which represent the coupling between the sleeve and the drill rods through the threads. A static and a dynamic test have been developed for determining the coupling parameters. The model is validated by simulating previous impact tests with a commercial CS joint.
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| 39. |
- Löfvendahl, Runo, et al.
(författare)
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Natursten i byggnader. Svensk byggnadssten & Skadebilder
- 1994
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Denna kombinerade byggnadsstens-och skadebildsatlas ingår i en riksomfattande inventering av stenmaterial och skador på kulturhistoriskt viktiga byggnader med exponerad och bearbetad natursten. När nordiskt samarbete kring luftföroreningarnas inverkan på kulturföremål inleddes 1987 utsågs natursten till ett av fyra delområden som skulle prioriteras. Vid ett första möte i Stockholm, med senare uppföljning i Raadvad utanför Köpenhamn, diskuterades en delvis gemensam nordisk aktionsplan för att restaurera och vårda natursten i byggnader och skulptural utsmyckning. Det visade sig finnas både likheter och skillnader beträffande material och åtgärder mellan länderna. Då vi i Sverige just påbörjat en landsomfattande inventerings-och konserveringskampanj, föll det sig naturligt att Sverige skulle utarbeta en skadebildsatlas med hänsyn till svenska bergarter. En samnordisk kommitté bildades i maj 1991 i Trondheim. Den svenska skadebildsatlasen skall ligga till grund för en integrerad nordisk atlas. Utgångspunkten har varit tidigare relativt rudimentär praxis i Sverige samt den nomenklatur och de system som byggts upp utomlands, framför allt i Tyskland, Italien och de anglosaxiska länderna.
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| 40. |
- Mellstrom, D, et al.
(författare)
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Osteoporosis, metabolic aberrations, and increased risk for vertebral fractures after partial gastrectomy
- 1993
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Ingår i: Calcified Tissue International. - 1432-0827. ; 53:6, s. 370-377
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Tidskriftsartikel (refereegranskat)abstract
- A case-control study compared 129 men with earlier partial gastrectomy (operation during the period 1952-1961) with 216 men from a community-based population study. All were born 1910-1915 and the mean age was 72 years. Men with a previous partial gastrectomy had vertebral fractures in 19% compared with 4% (P < 0.01) in the control population. Bone mineral density (BMD) in the right calcaneus measured with dual energy photon absorptiometry was 20% lower in men with a Billroth II operation (P < 0.001) and 8% lower with a Billroth I operation (ns). In comparison with the controls, the men subjected to partial gastrectomy had higher serum concentrations of osteocalcin and alkaline phosphatase activity, a lower serum concentration of 25-hydroxyvitamin D (25OHD) and a lower body mass index (BMI). There were no difference in serum concentrations of free calcium, intact parathyroid hormone (PTH), or free thyroxine. The smoking prevalence was significantly higher in men with partial gastrectomy than in controls. Smokers had significantly lower serum concentrations of intact PTH and 25OHD than nonsmokers and also lower BMD and BMI. The relationships between intact PTH on one hand, and ionized calcium (inverse relationship) and osteocalcin (direct relationship) on the other were preserved in smokers, however. Gastroscopy was performed in 78 men with multiple biopsies in the gastric remnant and also in the small intestine. All but two subjects had chronic gastritis. Examination of sternal bone marrow smears showed that 40% of the Billroth-operated men lacked bone marrow reticular iron.(ABSTRACT TRUNCATED AT 250 WORDS)
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- Tolosa, A J G, et al.
(författare)
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Effekter av polybromerade difenyletrar på sötvattenlevande evertebrater
- 1993
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Polybromerade difenyletrar (PBDE) är en typ av persistenta, lipofila substanser som bl a ingår i flamskyddsmedel, jordbrukskemikalier och bensintillsatser. Stora mängder av dessa ämnen kommer så småningom ut i naturen men omfattningen och effekter är ännu föga kända. PBDE är huvudbeståndsdel i den tekniska blandningen Bromkal 70. För att testa kroniska effekter av PBDE på sötvattensevertebrater användes statiska vattensystem bestående av kärl med sediment som kontaminerats med Bromkal 70. I systemen hölls i olika försök individer av arterna Asellus aquaticus (gråsugga) och Gammarus pulex (märlkräfta). Studerade parametrar var överlevnad, reproduktionsframgång och subletala effekter. Dessutom undersöktes eventuella synergistiska effekter på kvicksilverupptag hos Chironomus riparius (fjädermygglarv). Försöken där reproduktion samt överlevnad av adulta och juvenila märlkräftor studerades (koncentration Bromkal 70: 10, 150, 500 och 1000 ppm våtvikt) visade inte på några statistiska skillnader mellan de olika exponeringarna. Stora svårigheter att tolka resultaten förelåg dock p g a flera metodiska problem samt stor dödlighet i kontrollen. I försöket där sedimentet kontaminerats både med Bromkal 70 (0,01, 1 och 100 ppm våtvikt) och radioaktivt kvicksilver framkom att storleken på upptaget av kvicksilver hos Chironomus var beroende av halten Bromkal 70 i sedimentet samt exponeringstiden.
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