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- Adlerberth, Ingegerd, 1959, et al.
(författare)
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Interaction of P-fimbriated Escherichia coli with human meconium.
- 1991
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Ingår i: FEMS microbiology letters. - 0378-1097. ; 68:1, s. 57-62
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Tidskriftsartikel (refereegranskat)abstract
- The ability of Escherichia coli with different receptor specificities to interact with meconium was studied. E. coli strains expressing P-fimbriae, specific for Gal alpha 1-4Gal beta-containing receptors, were agglutinated by meconium at high titres. This reaction was inhibited by globotetraosylceramide. The attachment of P-fimbriated E. coli to human colonic epithelial cells of the HT-29 cell line was inhibited by meconium. Some type 1 fimbriated strains were agglutinated by meconium, but the agglutination was rarely blocked by methyl alpha-D-mannoside. The attachment by type 1 fimbriated strains to HT-29 cells was reduced by meconium only in some cases. These results suggest that meconium interacts with the P-fimbriae of E. coli, in a way that may influence bacterial colonization of the neonatal intestine.
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| 2. |
- Adlerberth, Ingegerd, 1959, et al.
(författare)
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Intestinal colonization with Enterobacteriaceae in Pakistani and Swedish hospital-delivered infants.
- 1991
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Ingår i: Acta paediatrica Scandinavica. - 0001-656X. ; 80:6-7, s. 602-10
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Tidskriftsartikel (refereegranskat)abstract
- Rectal cultures from Swedish and Pakistani hospital-delivered newborn infants were analysed regarding the early acquisition of enterobacteria. Swedish infants were delivered vaginally, Pakistani infants were delivered either vaginally or by caesarean section. The Swedish infants were all breast-fed, whereas breastfeeding was incomplete and often started late among the Pakistani infants. Both groups of Pakistani infants were more rapidly colonized with enterobacteria than were the Swedish infants. Cultures from Swedish infants seldom yielded more than one kind of enterobacteria; E. coli and Klebsiella were most frequently isolated. E. coli dominated in both Pakistani groups, but especially caesarean section delivered infants were in addition often colonized with Proteus, Klebsiella, Enterobacter or Citrobacter species. Breastfeeding from the first day of life reduced colonization with Klebsiella/Enterobacter/Citrobacter. The results suggest that environmental exposure, delivery mode and early feeding habits all influence the early intestinal colonization with enterobacteria.
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| 6. |
- Forsberg, Johan, et al.
(författare)
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The Hough transform inside the feedback loop of a mobile robot
- 1993
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Ingår i: Proceedings, IEEE International Conference on Robotics and Automation. - Los Alamitos, Calif : IEEE Communications Society. ; , s. 791-798
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Konferensbidrag (refereegranskat)abstract
- Accurate navigation of a mobile robot in cluttered rooms using a range measuring laser as a sensor is considered. The range weighted Hough transform (RWHT) is used to extract the directions and distances to the walls of the room. Using the extracted RWHT peaks in a feedback loop, the mobile robot is capable of a large variety of navigation tasks for navigating the robot through an open door detected by the laser, the accuracy during passage was found experimentally to be 1 cm at a speed of 0.5 m/s. For navigating through corridors, the accuracy was better than 1 cm at the maximum speed, 0.8 m/s, of the robot. Odometric data and laser measurements are combined using the extended Kalman filter. During motion, the size of the cluttered rectangular room is estimated as well as the position and the orientation (pose) of the robot. The navigation is very robust against both spurious laser measurements and disturbing objects
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| 10. |
- Larsson, Ulf, et al.
(författare)
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Navigating an articulated vehicle and reversing with a trailer
- 1994
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Ingår i: Proceedings, 1994 IEEE International Conference on Robotics and Automation. - Los Alamitos, Calif : IEEE Computer Society Press. - 0818653302 ; , s. 2398-2404
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Konferensbidrag (refereegranskat)abstract
- This paper describes two related tests; to navigate an articulated lawn mower and to reverse a mobile robot with a trailer. In both cases the vehicles are to follow a prespecified trajectory. The navigation principal is based on measured directions to several identical beacons, consisting of strips of reflective tapes. The angular sensor is a rotating laser for the illumination of the beacons and a highly sensitive electro-optical receiver for detecting the directions to the beacons. A Kalman filter is used to combine the measurements from the odometers with the detected angles to the known position of the beacons. To measure the angle between the robot and the trailer the same laser was used. This was done by placing two reflective beacons on the trailer. The repeatability was within 2 centimetre at low speed. The navigation of these two different types of vehicles turns out to be, essentially, the same problem. The sensitivities are different. Emphasis is on robust state estimation
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