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- Anderbrant, O., et al.
(författare)
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Electrophysiological and morphological characteristics of pheromone receptors in male pine sawflies, Diprion pini (Hymenoptera : Diprionidae), and behavioural response to some compounds
- 1995
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Ingår i: Journal of Insect Physiology. - : Elsevier BV. - 0022-1910. ; 41:5, s. 395-401
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Tidskriftsartikel (refereegranskat)abstract
- The morphology and physiology of pheromone receptors on the antennae of male pine sawflies, Diprion pini L., were investigated. Using scanning electron microscopy, five sensillar types were recognized. The type shown to be pheromone sensitive has a long (50-70 μm) cuticular hair, is single-walled, and is innervated by 8 or 9 sensory cells as revealed by transmission electron microscopy. Electroantennography (EAG) showed similar activity of the acetate and propionate of (2S,3R,7R)-3,7-dimethyl-2-tridecanol, precursor of the main constituent of the female-produced sex pheromone. No other isomer induced any significant response. Single-sensillum recordings confirmed the results of the EAG, and also showed that several neurons were excited by the active compound. EAG recordings and combined gas chromatographic-electroantennographic detection indicated that esters of three 3,7-dimethyl-2-pentadecanol (diprionol) isomers were active, but field tests could not demonstrate any behavioural effect. Diprionol esters are used as sex pheromones by all other pine sawflies investigated so far, and D. pini is thus the first diprionid species shown to use a different sex pheromone.
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- Edlund, C, et al.
(författare)
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Antianaerobic activity of a cecropin---melittin peptide
- 1998
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Ingår i: Clinical microbiology and infection : the official publication of the European Society of Clinical Microbiology and Infectious Diseases. - : Elsevier BV. - 1469-0691. ; 4:4, s. 181-185
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Tidskriftsartikel (refereegranskat)
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- Edlund, C, et al.
(författare)
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Effect of quinolones on intestinal ecology
- 1999
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Ingår i: Drugs. - : Springer Science and Business Media LLC. - 0012-6667. ; 5858 Suppl 2, s. 65-70
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Tidskriftsartikel (refereegranskat)
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- Edlund, Håkan, 1966-, et al.
(författare)
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Formation of a Liquid Crystalline Phase in the Sodium Taurodeoxycholate-Water System
- 1998
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Ingår i: Langmuir. - Washington DC : ACS Publications. - 0743-7463 .- 1520-5827. ; 14, s. 3691-3697
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Tidskriftsartikel (refereegranskat)abstract
- The binary phase equilibria for the system sodium taurodeoxycholate-water have been studied. The system forms a liquid crystalline phase in addition to the previously known isotropic solution phase at 22 °C. 2H (water) NMR quadrupole splitting, SAXS data in combination with the polarizing microscopic texture observed for the liquid crystal indicate that the liquid crystalline phase consists of a hexagonal-type aggregate structure. A metastable liquid crystal, probably with lamellar-type structure, also appears to exist prior to the formation of the stable hexagonal phase. A micellar growth is measured with the NMR self-diffusion method for the isotropic solution phase. Electrical conductance experiments are used to determine the liquid crystal-solution thermal transition.
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- Fang, Hong, et al.
(författare)
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Identification of the metallo-beta-lactamase gene from clinical isolates of Bacteroides fragilis
- 1999
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Ingår i: Anaerobe. - : Elsevier BV. - 1075-9964 .- 1095-8274. ; 5:3-4, s. 431-434
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Tidskriftsartikel (refereegranskat)abstract
- Bacteroides fragilis is one of the organisms known to produce carbapenem-hydrolysing metallo-beta-lactamase, which can confer resistance to a wide variety of beta-lactams. The purpose of this study was to identify carbapenem-hydrolysing metallo-beta-lactamase-producing B. fragilis strains by means of PCR assay, nucleotide sequencing and enzyme inhibition studies. Ten beta-lactam-resistant B. fragilis isolates were investigated. Four imipenem-resistant strains among the 10 isolates gave positive reactions in the PCR assay. The nucleotide sequences of the PCR products from two imipenem-resistant strains shared >98% similarity with the metallo-beta-lactamase gene from B. fragilis TAL 3636, which was used as a control. The amino acid sequence homology between the two imipenem-resistant strains and B. fragilis TAL 3636 was 99.2%. These strains produced high amounts of Zn2+-dependent beta-lactamases which were inactivated by EDTA.
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- Persson, P-A, et al.
(författare)
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Physical properties of pressure polymerized C60
- 1995
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Ingår i: High Pressure Science and Technology. - Singapore : World Scientific and Engineering Academy and Society. - 9810225474 ; , s. 716-718
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Konferensbidrag (refereegranskat)
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- Sundqvist, Bertil, et al.
(författare)
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Physical properties of pressure polymerized C60
- 1996
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Ingår i: Proceedings of the Symposium on Recent Advances in the Chemistry and Physics of Fullerenes and Related Materials. - Pennington, NJ : Electrochemical Society, Incorporated. - 1566771625 ; , s. 1014-1028
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Konferensbidrag (refereegranskat)
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