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- Bennett, J. R. J., et al.
(författare)
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Measurements of intense beams of Li-11 from a tantalum foil target
- 1999
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Ingår i: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 155:4, s. 515-517
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Tidskriftsartikel (refereegranskat)abstract
- The yields of Li-11 from a tantalum target, constructed from very thin foils, have been measured at ISOLDE and found to be an order of magnitude greater than those previously measured for a standard roll foil target. The modifications to the existing target designs were based on theoretical modelling calculations. The tantalum foils are 2 mu m thick and the target mass is only one tenth of normal foil targets. (C) 1999 Elsevier Science B.V. All rights reserved.
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- Norman, P., et al.
(författare)
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Efficient parallel implementation of response theory : Calculations of the second hyperpolarizability of polyacenes
- 1996
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Ingår i: Chemical Physics Letters. - 0009-2614 .- 1873-4448. ; 253:1-2, s. 1-7
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Tidskriftsartikel (refereegranskat)abstract
- We describe an efficient parallel implementation of response theory for calculations of molecular properties, and demonstrate its performance by calculations on a series of polyacene molecules, from benzene to hexacene. The polarizability and the second hyperpolarizability of the molecules in this series are found to scale as N 1.4 and N 3.5, respectively, where N is the number of benzene rings in the molecule. These N-dependences are weaker than those predicted for the linear polyenes.
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- Ramström, E, et al.
(författare)
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Study of (n,p) reactions at En=100 MeV
- 1996
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Ingår i: Second International Conference on Accelerator-Driven Transmutation Technologies and Applications. ; , s. 632-
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Konferensbidrag (refereegranskat)
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| 17. |
- Ringbom, Anders, et al.
(författare)
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The Pb-208(n,p)Tl-208 reaction at E-n=97 MeV
- 1997
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Ingår i: NUCLEAR PHYSICS A. - : ELSEVIER SCIENCE BV. - 0375-9474. ; 617:3, s. 316-330
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Tidskriftsartikel (refereegranskat)abstract
- Double-differential cross sections of the Pb-208(n,p) reaction have been measured at 97 MeV in the angular range 0 degrees-30 degrees for excitation energies up to 40 MeV. The experimental proton spectra have been compared with calculated spectra obtained
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- Ruud, K., et al.
(författare)
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Generalized integral-screening for efficient calculations of nonlinear optical properties of large molecules
- 1998
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 108:19, s. 7973-7979
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Tidskriftsartikel (refereegranskat)abstract
- We describe the implementation of integral screening in the integral-direct SCF calculation of cubic response functions. The screening is applied to all computational steps that involve the construction of Fock matrices or one-index transformed Fock matrices. We apply this implementation to study the length dependence of the polarizability and second hyperpolarizability of diphenylpolyenes. It is demonstrated that calculations of the second hyperpolarizability of molecules containing more than 140 atoms are now accessible by ab initio methods on a time scale that makes it of interest in real applications.
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- Backman, M, et al.
(författare)
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The phase-variable pilus-associated protein PilC is commonly expressed in clinical isolates of Neisseria gonorrhoeae, and shows sequence variability among strains
- 1998
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Ingår i: Microbiology (Reading, England). - : Microbiology Society. - 1350-0872 .- 1465-2080. ; 144144 ( Pt 1), s. 149-156
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Tidskriftsartikel (refereegranskat)abstract
- Summary: PilC is a phase-variable protein associated with pilus-mediated adherence of pathogenic Neisseria to target cells. In this study, 24 strains of Neisseria gonorrhoeae with known epidemiological data were examined for expression of PilC. All strains produced PilC independently of serovar and site of isolation. To investigate whether the PilC protein is conserved or variable among gonococcal strains, the complete nucleotide sequence of pilC in four strains, isolated from either rectum, throat or blood, was determined. The deduced amino acid sequence in these strains differed from each other and from the two PilC proteins of N. gonorrhoeae MS11. These data demonstrate that PilC is commonly expressed, but the PilC sequence may vary among gonococcal strains.
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- Björn (Fredriksson), Annika, 1972-, et al.
(författare)
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Interimreport 1 for the project on natural formation, degradation and occurrence of methyltins in different habitats. : Common project between Rohm and Haas, former Morton Plastics Additive (MPA), Cincinnati, Ohio, USA and the Department of Water and Environmental Studies (DWES), Linköping Univeristy, Sweden
- 1998
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Rapport (övrigt vetenskapligt/konstnärligt)
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- Börjesson, T., et al.
(författare)
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Electronic nose for odor classification of grains
- 1996
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Ingår i: Cereal Chemistry. - : American Association of Cereal Chemists. - 0009-0352 .- 1943-3638. ; 73:4, s. 457-461
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Tidskriftsartikel (refereegranskat)abstract
- An electronic nose was used to classify grain samples based on their smell and to predict the degree of moldy/musty odor. A total of 235 samples of wheat, barley and oats, which had been odor classified by at least two grain inspectors, were used. Headspace samples from heated grain were pumped through chambers containing metal oxide semiconductor field effect transistor (MOSFET) sensors, SnO2 semiconductors and an infrared detector monitoring CO2. The sensor signals were evaluated with a pattern-recognition software program based on artificial neural networks. The samples were divided into either the four classes moldy/musty, acid/sour, burnt, or normal or the two classes good and bad according to the inspectors descriptions. They were also assigned a score describing their intensity of moldy/musty odor. The electronic nose correctly classified approximate to 75% of the samples when using the four-class system and approximate to 90% when using the two-class system. These values exceeded the corresponding percentages of agreement between two grain inspectors classifying the grain.
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- Cronhjort, M, et al.
(författare)
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Sympathotropic drugs and the distribution of 99mTc-hydroxymethylene diphosphonate. Experimental studies in the mouse
- 1999
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Ingår i: Acta radiologica (Stockholm, Sweden : 1987). - : SAGE Publications. - 0284-1851 .- 1600-0455. ; 40:3, s. 309-313
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Tidskriftsartikel (refereegranskat)abstract
- Objective: the uptake of bone-seeking radiopharmaceuticals depends on the blood flow, which is influenced by the sympathetic nervous system. Our aim was to study the effect of sympathomimetic drugs on the distribution of bone-seeking agents. Material and Methods: Various sympathomimetic and β-blocking drugs were injected in mice at different times in relation to the administration of 99mTc-HDP Three hours after this, venous blood and various organs were removed and their activities were related to the administered activity. A kinetic study of the whole-body activity retention after administration of terbutaline was also made. Results: the biodistribution of 99mTc-HDP was similar after the administration of sympathomimetics and of β-antagonists. All drugs gave rise to an increased soft tissue activity and a decreased bone activity, corresponding to a lowered quality of the potential bone scan. Terbutaline gave rise to an increased excretion of 99mTc-HDP. the mechanisms behind the findings cannot be entirely explained. Conclusion: Drug interference with the sympathetic nervous system causes undesirable effects on the biodistribution of 99mTc-HDP in the mouse. Studies in humans are necessary to evaluate whether clinical treatment with sympathotropic drugs affects the bone scintigram.
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| 34. |
- ERICSON, TEO, et al.
(författare)
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PI-NN COUPLING FROM HIGH-PRECISION NP CHARGE-EXCHANGE AT 162 MEV
- 1995
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Ingår i: PHYSICAL REVIEW LETTERS. - : AMER INST PHYSICS. - 0031-9007. ; 75:6, s. 1046-1049
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Differential np cross sections for unpolarized neutrons of 162 MeV have been measured to high precision with particular attention to the absolute normalization. These data can be extrapolated precisely and model independently to the pion pole and give a p
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| 46. |
- Jonsson, A., et al.
(författare)
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Electronic nose for microbial quality classification of grains
- 1997
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Ingår i: International Journal of Food Microbiology. - : Elsevier. - 0168-1605 .- 1879-3460. ; 35:2, s. 187-193
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Tidskriftsartikel (refereegranskat)abstract
- The odour of grains is in many countries the primary criterion of fitness for consumption. However, smelling of grain for quality grading should be avoided since inhalation of mould spores or toxins may be hazardous to the health and determinations of the off-odours are subjective. An electronic nose, i.e. a gas sensor array combined with a pattern recognition routine might serve as an alternative. We have used an electronic nose consisting of a sensor array with different types of sensors. The signal pattern from the sensors is collected by a computer and further processed by an artificial neural network (ANN) providing the pattern recognition system. Samples of oats, rye and barley with different odours and wheat with different levels of ergosterol, fungal and bacterial colony forming units (cfu) were heated in a chamber and the gas in the chamber was led over the sensory array. The ANN could predict the odour classes of good, mouldy, weakly and strongly musty oats with a high degree of accuracy. The ANN also indicated the percentage of mouldy barley or rye grains in mixtures with fresh grains. In wheat a high degree of correlation between ANN predictions and measured ergosterol as well as with fungal and bacterial cfu was observed. The electronic nose can be developed to provide a simple and fast method for quality classification of grain and is likely to find applications also in other areas of food mycology.
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| 49. |
- Jonsson, Bo H
(författare)
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Psychophysiological study of functional dyspepsia
- 1999
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Functional dyspepsia (FD) is a common disorder. Its etiology is insufficiently known. Specific treatment is often lacking. This thesis investigates the following questions: 1) do FD patients have different psychological symptoms and personality compared with a matched healthy control group?, 2) do the two groups have different levels or patterns of plasma hormones in a psychophysiological experiment?, 3) how do gastrointestinal and psychological symptoms develop over time as measured in a seven-year follow-up?, and 4) do any of the hormones in the first study predict symptom development between the two studies? 25 patients (12 men, 13 women), between 24 and 50 years old, were compare pairwise with community control subjects. Peptic ulcer and other organic diseases were excluded. Clinical symptoms, personality and psychosocial data were studied. In an experiment with different provocations, plasma was sampled for biochemical analyses. 24 of the patients and 22 of the control subjects participated in the follow-up study seven years later. 4 patients and 3 control subjects had a positive titre for Helicobacter pylori. Significant results: In Karolinska Scales of Personality, the patient group scored lower detachment than the control group. During a 15 min stress interview, with the aim to elicit anxiety in the subject, plasma gastrin and prolactin increased in both groups. Cholecystokinin increased in the patients but not in the control subjects. Somatostatin correlated positively with dyspeptic symptoms. The prolactin level was lower in the patient group than in the control group. Motilin was lower in subjects with a higher level of indigestion symptoms. Increase of motilin correlated with increase of joyfulness during the test. There was a negative correlation between cortisol and diarrhoea symptoms. In the follow-up study, somatostatin predicted continuous abdominal pain symptoms. Within the patient group, low cortisol correlated and low motilin tended to correlate with a higher degree of diarrhoea symptoms. Neuropeptide Y had no relation to gastrointestinal symptoms.
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| 50. |
- Jonsson, B J, et al.
(författare)
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Method to extract the critical current density and the flux-creep exponent in high-T-c thin films using ac susceptibility measurements
- 1998
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Ingår i: Physical Review B Condensed Matter. - 0163-1829 .- 1095-3795. ; 58:9, s. 5862-5867
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Tidskriftsartikel (refereegranskat)abstract
- High-precision ac susceptibility measurements have been made on high-quality Hg-1212 thin films. A method to analyze chi(1)'(T,H-0,f) and chi(1)" (T,H-0,f) and extract the temperature dependence of the critical current density J(c)(T), as well as the temperature and field-dependent flux-creep exponent n(T,H-0), is presented. With specific measurements at external ac fields Ho in the range 7-100 Oe(rms) we determine the temperature dependence of the critical current density from a single temperature scan. The obtained temperature dependence, J(c)(T), is found to be in good agreement with data obtained from measurements using the traditional "loss-maximum" approach. In addition we present a method to extract the temperature and ac field-dependent flux-creep exponent n(T,H-0) from a set of temperature scans taken at different cc fields and driving frequencies. The observed power law describing the frequency dependence of chi' is consistent with a current-dependent effective activation energy of the form U(J)= U(0)ln(J(c)/J). Furthermore, the flux creep is found to increase with ac field and with temperature except at about 20-30 K below T-c, where our data suggest a slowing down of the flux creep.
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