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- Hammar, M, et al.
(författare)
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Expression of two csg operons is required for production of fibronectin- and congo red-binding curli polymers in Escherichia coli K-12.
- 1995
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Ingår i: Molecular Microbiology. - : Wiley. - 0950-382X .- 1365-2958. ; 18:4, s. 661-70
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Tidskriftsartikel (refereegranskat)abstract
- Two divergently transcribed operons in Escherichia coli required for the expression of fibronectin- and Congo red-binding curli polymers were identified and characterized by transposon mutagenesis, sequencing and transcriptional analyses, as well as for their ability to produce the curli subunit protein. The csgBA operon encodes CsgA, the major subunit protein of the fibre, and CsgB, a protein with sequence homology to CsgA. A non-polar csgB mutant is unaffected in its production of CsgA, but the subunit protein is not assembled into insoluble fibre polymers. A third open reading frame, orfC, positioned downstream of csgA may affect some functional property of curli since an insertion in this putative gene abolishes the autoagglutinating ability typical of curliated cells without affecting the production of the fibre. The promoter for the oppositely transcribed csgDEFG operon was identified by primer extension and shown, like the csgBA promoter, to be dependent upon the alternate stationary phase-specific sigma factor sigma s in wild-type cells, but not in mutants lacking the nucleoid associated protein H-NS. Insertions in csgD abolish completely trancription from the csgBA promoter. Therefore, any regulatory effect on the csgBA promoter might be secondary to events controlling the csgDEFG promoter and/or activation of CsgD. Insertions in csgE, csgF and csgG abolish curli formation but allow CsgA expression suggesting that one or more of these gene products are involved in secretion/assembly of the CsgA subunit protein. No amino acid sequence homologies were found between the CsgE, CsgF and CsgG proteins and secretion/assembly proteins for other known bacterial fibres, suggesting that the formation of curli follows a novel pathway.
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| 2. |
- Levi, Richard, et al.
(författare)
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The Stockholm Spinal Cord Injury Study : 2. Associations between clinical patient characteristics and post-acute medical problems.
- 1995
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Ingår i: Paraplegia. - : Springer Science and Business Media LLC. - 0031-1758. ; 33:10, s. 585-594
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Tidskriftsartikel (refereegranskat)abstract
- The Stockholm Spinal Cord Injury Study (SSCIS) is an extensive evaluation of a sample of 353 subjects with traumatic SCI, constituting 93% of the known regional prevalence population with this diagnosis. In a previous analysis of this group, symptoms such as pain, incontinence, sexual dysfunction and neurological deterioration, as well as secondary complications, such as decubitus ulcers, urinary tract infections, spinal deformity and fractures, were found to be common. In the present report, we investigate associations between a few commonly used patient characteristics, ie gender, age at injury, duration of injury and extent of neurological compromise, and the occurrence of such problems, to assess differences in vulnerability in SCI subgroups. Results generally indicate an increased vulnerability in subjects with extensive neurological deficits, as well as a cumulation of complications with the increasing duration of injury. However, some exceptions are found, possibly indicating differences in temporal patterns of the occurrence of various complications, as well as certain gender-, age-, and lesion-associated variations in vulnerability. Symptoms directly related to the spinal cord lesion, eg neurogenic pain and neurological deterioration, seem to present rather soon post-injury. Males are more prone to experience excessive spasticity and sexual problems. Females experience more fractures and spinal deformity. Younger age at injury is associated with more spinal deformity but less severe pain problems. Higher age at injury is not found to be associated with more medical problems, with the exception of neurogenic pain, among post-acute, post-discharge survivors. The latter finding does not, however, preclude more such problems in the acute stage, since the present study neither addresses the pre-discharge period, nor includes information about mortality. Finally, the ASIA/IMSOP Impairment Scale Grade E-rated subjects were found to report problems to an extent that underlines the restricted sensorimotor sense in which this rating reflects recovery.
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| 3. |
- Levi, Richard, et al.
(författare)
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The Stockholm spinal cord injury study : 1. Medical problems in a regional SCI population.
- 1995
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Ingår i: Paraplegia. - : Springer Science and Business Media LLC. - 0031-1758. ; 33:6, s. 308-315
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Tidskriftsartikel (refereegranskat)abstract
- Out of a regional traumatic spinal cord injury population consisting of 379 individuals, 353 (93.1%) participated in the present study. Subjects were individually interviewed using semi-structured protocols. In addition, previous medical records were available for over 96% of subjects, and were used in all these cases to minimise recall bias. Cause of injury, prevalence of present medical symptoms and occurrence of medical complications in the post-acute, post-discharge phase were recorded. Neurological classification was verified by physical examination according to ASIA/IMSOP standards. Many subjects had experienced complications since discharge from initial hospitalisation, especially urinary tract infections, decubitus ulcers, urolithiasis, and neurological deterioration. Prevalence of medical symptoms was also high. More than 41% of subjects with spastic paralysis reported excessive spasticity to be associated with additional functional impairment and/or pain. Almost two-thirds of subjects reported significant pain, with a predominance of neurogenic-type pain. Bladder and bowel dysfunction were each rated by nearly 41% of subjects as a moderate to severe life problem. As expected, sexual dysfunction was also commonly reported. Prevalence of reported symptoms by general systems review was high, particularly fatigue, constipation, ankle oedema, joint and muscle problems, and disturbed sleep. However, lack of adequate normative data precludes comparison with the general population. The frequent occurrence of reported medical problems and complications support advocacy of comprehensive, life-long care for SCI patients. The commonly reported problems of neurogenic pain and neurological deterioration, in particular, require more attention, as these symptoms are not seldom ominous, either by virtue of their impact on quality of life, or because of underlying pathology.
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| 10. |
- Wimo, A, et al.
(författare)
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Patients with dementia in group living: experiences 4 years after admission
- 1995
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Ingår i: International psychogeriatrics. - 1041-6102 .- 1741-203X. ; 7:1, s. 123-127
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Tidskriftsartikel (refereegranskat)abstract
- Sixteen patients with dementia were studied 4 years after admission to group-living (GL) units, an intermediate level of dementia care. Of eight patients who were still alive, four lived in the GL units and four had been institutionalized. The eight patients who had died had spent 89% of their survival time in GL. Aggression was the most frequent cause of institutionalization.
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