| 1. |
- Ausmees, Nora, et al.
(författare)
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Structural and putative regulatory genes involved in cellulose synthesis in Rhizobium leguminosarum bv. trifolii
- 1999
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Ingår i: Microbiology. - : Microbiology Society. - 1350-0872 .- 1465-2080. ; 145, s. 1253-1262
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Tidskriftsartikel (refereegranskat)abstract
- Six genes involved in cellulose synthesis in Rhizobium leguminosarum bv. trifolii were identified using Tn5 mutagenesis. Four of them displayed homology to the previously cloned and sequenced Agrobacterium tumefaciens cellulose genes celA, celB, celC and celE. These genes are organized similarly in R. leguminosarum bv. trifolii. In addition, there were strong indications that two tandemly located genes, celR1 and celR2, probably organized as one operon, are involved in the regulation of cellulose synthesis. The deduced amino acid sequences of these genes displayed a high degree of similarity to the Caulobacter crescentus DivK and PleD proteins that belong to the family of two-component response regulators. This is to our knowledge the first report of genes involved in the regulation of cellulose synthesis. Results from attachment assays and electron microscopic studies indicated that cellulose synthesis in R. leguminosarum bv. trifolii is induced upon close contact with plant roots during the attachment process.
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| 2. |
- Ekholm, Hans, et al.
(författare)
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Öppet intag - En väg till drogfrihet? Rapport 1 : Beskrivning av klienter vid Vårnäs behandlingshem.
- 1999
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Centrum för välfärdsforskning åtog sig våren 1999 att utvärdera behandlingsformen Öppet intag – på Vårnäs behandlingshem i Vingåker – åt Vårdförbundet Sörmland. Verksamheten, som startade som ett pilotprojekt i Katrineholm den 1 juli 1996, har idag stöd av samtliga Sörmlandskommuner. Närmare 500 personer har varit i kontakt med Öppet intag. Det är en intressant och spännande behandlingsform, som är väl värd att studera och utvärdera både ur ett vetenskapligt, samhälleligt och individuellt perspektiv. Uppläggning av utvärderingen bygger på diskussioner med den politiska ledningsgruppen för Vårdförbundet Sörmland och samtal med personal på Vårnäs. Utvärderingen är tänkt att utgöra underlag för beslut om fortsatt verksamhet och för vidareutveckling av densamma.
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| 3. |
- Gustafsson, Hans, et al.
(författare)
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Development of low-emitting building materials
- 1999
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Ingår i: Proceedings of the 8th International Conference on Indoor Air Quality and Climate. Indoor Air '99, Edinburgh, Scotland, 8-13 August 1999. - : Construction Research Communications.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 4. |
- Hedbom, Hans, et al.
(författare)
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A Comparison of the Security of Windows NT and UNIX
- 1998
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Konferensbidrag (refereegranskat)abstract
- This paper presents a brief comparison of two operating systems, Windows NT and UNIX. The comparison covers two different aspects. First, we compare the main security features of the two operating systems and then we make a comparison of a selection of vulnerabilities most of which we know have been used for making real intrusions. We found that Windows NT has slightly more rigorous security features than standard UNIX but the two systems display similar vulnerabilities. The conclusion is that there are no significant differences in the real level of security between these systems
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| 5. |
- Hedbom, Hans, et al.
(författare)
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A Preliminary Evaluation of the Security of a Non-Distributed Version of Windows NT
- 1997
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Konferensbidrag (refereegranskat)abstract
- In this paper we present a preliminary evaluation of the security of a non-distributed version of Windows NT. The objectives of the work are twofold: first, to learn more about the security system; and, second, to find out how secure the system actually is. Thus the architecture and security mechanisms of Windows NT have been studied. Furthermore, the paper contains a few examples of successful intrusions on the target system, which was a standard personal computer with Windows NT Workstation 3.51 and one with NT Workstation 4.0, both working in a stand-alone mode. We have also found some evidence that other, more severe security flaws exist in the system
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| 6. |
- Hedbom, Hans, et al.
(författare)
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A Security Evaluation of a Non-Distributed Version of Windows NT
- 1997
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Rapport (refereegranskat)abstract
- In this paper we present an evaluation of the security in Windows NT. The objectives of the work are twofold: first, to learn more about the security system; and, second, to find out how secure the system actually is. To investigate the latter, the authors, have adopted the role of attackers. This paper contains results from several attempts to violate the security of Windows NT. In some cases, the attempts were successful, meaning that we gained access to information or resources that should be protected. The target systems were standard personal computers with Windows NT Workstation 3.51 and Windows NT Workstation 4.0 respectively, both working in stand-alone mode
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| 7. |
- Hedbom, Hans, et al.
(författare)
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Analysis of the Security of Windows NT
- 1998
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Rapport (refereegranskat)abstract
- This paper presents an analysis of the security in Windows NT 4.0, working in both stand-alone and networking mode. The objective of the work was to find out how secure this operating system actually is. A technical overview of the system, and in particular its security features is given. The system security was analyzed and practical intrusion attempts were made in order to verify vulnerabilities or to find new ones. All vulnerabilities are described in detail and classified according to a classification scheme. A comparison to commonly known UNIX weaknesses was made. It revealed generic similarities between the two systems to a surprisingly high degree. Finally a number of recommendations are given. The paper concludes that there are ample opportunities to improve the security of Windows NT. We have reason to believe that it is probably not higher than that of UNIX
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| 8. |
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| 9. |
- Hedlund, Christer, 1964-, et al.
(författare)
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Angular dependence of the polysilicon etch rate during dry etching in SF6 and Cl-2
- 1997
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Ingår i: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films. - : American Vacuum Society. - 0734-2101 .- 1520-8559. ; 15:3, s. 686-691
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Tidskriftsartikel (refereegranskat)abstract
- The angular dependence of the etch rate in reactive ion etching (RIE) and inductively coupled plasma (ICP) systems for polysilicon etching with SF6" role="presentation" style="display: inline; line-height: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">SF6SF6 and Cl2" role="presentation" style="display: inline; line-height: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">Cl2Cl2 is determined using a recently developed direct measurement method. The latter utilizes specially patterned silicon groove structures consisting of 7–10 μm wide planar surfaces which form various angles with respect to the wafer normal. The structures are produced by highly anisotropic wet chemical etchingof Si through a gratinglike mask pattern aligned along specific crystallographic orientations of the wafer which results in the development of planar surfaces of various orientations. These surfaces are then coated with the materials to be studied—polysilicon in this case. The deposited polysilicon is then etched under a variety of conditions in a RIE and an ICP reactor and the etch rates determined by interferometric measurements. Since only standard Si wafers are used and the size of the pattern is only a few μm the method is fully IC production compatible, which means that one can measure the angular dependence of the etch rate directly in production etching systems. The results for RIE of polysilicon with SF6" role="presentation" style="display: inline; line-height: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">SF6SF6 show that the process becomes more isotropic with increasing pressure. The angular dependence of the RIE and ICP polysilicon etchrates in Cl2" role="presentation" style="display: inline; line-height: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">Cl2Cl2 atmosphere were found to vary with the substrate bias. Specifically low substrate bias resulted in an under cosine distribution whereas bias higher than 240–250 V led to over cosine distributions.
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| 10. |
- Hedlund, Christer, et al.
(författare)
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Angular dependence of the polysilicon etch rate during dry etching in SF6 and Cl-2
- 1997
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Ingår i: JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS. - 0734-2101. ; 15:3, s. 686-691
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Tidskriftsartikel (refereegranskat)abstract
- The angular dependence of the etch rate in reactive ion etching (RIE) and inductively coupled plasma (ICP) systems for polysilicon etching with SF6 and Cl-2 is determined using a recently developed direct measurement method. The latter utilizes specially
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| 11. |
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| 12. |
- Jonsson, Charlotte A, 1971, et al.
(författare)
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Mycophenolate mofetil ameliorates perivascular T lymphocyte inflammation and reduces the double-negative T cell population in SLE-prone MRLlpr/lpr mice.
- 1999
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Ingår i: Cellular immunology. - : Elsevier BV. - 0008-8749. ; 197:2, s. 136-44
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Tidskriftsartikel (refereegranskat)abstract
- Effects on T lymphocyte mediated pathology, phenotypes, and functions in MRLlpr/lpr mice given mycophenolate mofetil (MMF) (100 mg/kg/day) via drinking water or controls given ip cyclophosphamide (CYC) injections (1.8 mg/mouse/week) or water were described. Both MMF and CYC treatment diminished kidney and large salivary gland perivascular cell infiltrates, reduced profoundly double-negative (DN) T cell frequencies, decreased total lymphocyte number in spleen, and increased in vitro proliferative response to Con A. IFN-gamma and IL-10 in supernatants from Con A stimulated spleen cells were augmented after MMF but not CYC treatment. MMF treatment increased whereas CYC reduced IL-12 in serum. Kidney expressions of IFN-gamma, IL-10, and IL-12 mRNA were unaffected by MMF but decreased by CYC. Our results demonstrate that MMF and CYC suppress perivascular T lymphocyte inflammation by reducing the DN T cell population and by amelioration of T cell function. The varying cytokine patterns suggest different mechanisms of the two drugs.
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| 13. |
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| 14. |
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| 15. |
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| 16. |
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| 17. |
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| 18. |
- Jonsson, Lars, et al.
(författare)
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Controlled topography production - True 3D simulation and experiment
- 1995
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Ingår i: Vacuum. - 0042-207X .- 1879-2715. ; 46, s. 971-975
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Tidskriftsartikel (refereegranskat)abstract
- A true 3D computer program, named DINESE, has been developed to simulate the evolution of real 3D structures during erosion and deposition. It is based on the generalized Huygens reconstruction formalism of surface evolution and can predict the evolution of any surface of the form z = f(x,y) resulting from any erosion or deposition process. True 3D computer simulations of a number of cases are presented and compared with experiment. The powers of the simulation method are further demonstrated by a series of sequential predictive simulations resulting in a desired topography which is then verified experimentally under the same sequence of conditions. Specifically, the evolution of different Si3N4 structures during ion beam etching with Ar ions under different erosion conditions has been studied both numerically and experimentally.
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| 19. |
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| 20. |
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| 21. |
- Kesteris, Uldis, et al.
(författare)
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Polyethylene wear and synovitis in total hip arthroplasty: a sonographic study of 48 hips
- 1999
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Ingår i: Journal of Arthroplasty. - 0883-5403. ; 14:2, s. 138-143
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Tidskriftsartikel (refereegranskat)abstract
- Forty-six patients (48 hips), operated on with cemented total hip arthroplasty (THA) because of arthrosis, were examined radiographically and sonographically at 10-year follow-up. Polyethylene wear of acetabular cups was measured on conventional non-weight-bearing pelvic radiographs, and the volume of polyethylene debris was calculated. Radiographic signs of loosening were identified. The capsular distance (ie, thickness of the synovium or synovial contents) was measured sonographically. We found a significant correlation between increased volumetric wear and increased capsular distance. Hips with radiographically loose acetabular components had significantly greater volumetric wear and capsular distance than those without signs of acetabular loosening. This relationship was not observed in hips with radiographically loose femoral components. In cemented THA, the volume of polyethylene wear debris and the thickness of the synovium and the synovial contents are related. In the event of radiographic loosening of the acetabular component, they are both increased.
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| 22. |
- Lindskog, Stefan, et al.
(författare)
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An Analysis of the Security of Windows NT
- 1999
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Rapport (refereegranskat)abstract
- This paper presents an analysis of the security of Windows NT 4.0. The primary objective of the analysis was to investigate how secure the operating system actually is. A technical overview of the system, and in particular of its security features, is given. The system security was analyzed and practical intrusion attempts were made in order to verify known vulnerabilities and find new ones. The paper concludes that there are ample opportunities to improve the security of Windows NT
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| 23. |
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| 24. |
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| 25. |
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| 26. |
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| 27. |
- Robertsson, Otto, et al.
(författare)
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Intracapsular pressure and loosening of hip prostheses. Preoperative measurements in 18 hips
- 1997
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Ingår i: Acta Orthopaedica Scandinavica. - : Medical Journals Sweden AB. - 0001-6470. ; 68:3, s. 231-234
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Tidskriftsartikel (refereegranskat)abstract
- We measured the intracapsular pressure preoperatively in 18 hips (17 patients) before revision of a total hip arthroplasty because of aseptic loosening. Distension of the joint capsule was measured with sonography in 13 cases. In extension, the mean intracapsular pressure was 26 (0-60) mmHg, in extension and inward rotation it was 159 (24-280) mmHg, in extension and outward rotation it was 30 (3-67) mmHg and in 45 degrees of flexion it was 12 (0-28) mmHg. A mean of 6 (0.5-20) mL of joint fluid was aspirated after the pressure measurements. Sonography showed increased joint fluid/synovial edema and/or increased capsular thickness, as compared to 34 unrevised, radiographically not loose prosthetic hips, and that the capsular distension correlated to intracapsular pressure during extension and inward rotation. We conclude that the intracapsular pressure usually is elevated in a hip joint with loose prosthetic components, that the intracapsular pressure varies with the position of the hip and that capsular distension reflects increased intracapsular pressure. The increased and often very high pressure, varying during gait, may pump debris away from the joint along the interfaces and even by itself cause osteolysis and loosening.
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| 28. |
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| 29. |
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| 30. |
- Shamrai, K P, et al.
(författare)
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Discharge disruptions in a helicon plasma source
- 1997
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Ingår i: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films. - : American Vacuum Society. - 0734-2101 .- 1520-8559. ; 15:6, s. 2864-2874
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Tidskriftsartikel (refereegranskat)abstract
- We study experimentally and theoretically stable regimes and dischargedisruptions in a helicon plasma source. At fixed input power and gas pressure, stable operation of the source is possible below some critical value of magnetic field Bcr." role="presentation" style="display: inline; line-height: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">Bcr.Bcr. The plasma density increases with the magnetic field and reaches a maximum value nmax" role="presentation" style="display: inline; line-height: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">nmaxnmax at Bcr;" role="presentation" style="display: inline; line-height: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">Bcr;Bcr; after which the discharge disruption occurs. Both Bcr" role="presentation" style="display: inline; line-height: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">BcrBcr and nmax" role="presentation" style="display: inline; line-height: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">nmaxnmax increase almost linearly with the input power and the rate of increase is increasing with the pressure. Matching of the plasma load to the rf power source improves when approaching the disruption point, and becomes perfect at the critical field. The theory of discharge disruptions assumes the power absorption in a helicon source to arise from the linear conversion of helicon waves into electrostatic waves at the plasma edge. The calculated dependence of the absorbed power on the plasma density turns out to be nonmonotonic with minima at antiresonances of the electrostatic waveexcitation. This explains qualitatively principal peculiarities of dischargedisruptions. The calculated plasma impedance is in agreement with experimental value within a factor of 2.
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| 31. |
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| 32. |
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