| 1. |
- Abad, JM, et al.
(författare)
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Immobilization of peroxidase glycoprotein on gold electrodes modified with mixed epoxy-boronic acid monolayers
- 2002
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Ingår i: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 1520-5126 .- 0002-7863. ; 124:43, s. 12845-12853
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Forskningsöversikt (refereegranskat)abstract
- The development of bioelectronic enzyme applications requires the immobilization of active proteins onto solid or colloidal substrates such as gold. Coverage of the gold surface with alkanethiol self-assembled monolayers (SAMS) reduces nonspecific adsorption of proteins and also allows the incorporation onto the surface of ligands with affinity for complementary binding sites on native proteins. We present in this work a strategy for the covalent immobilization of glycosylated proteins previously adsorbed through weak, reversible interactions, on tailored SAMS. Boronic acids, which form cyclic esters with saccharides, are incorporated into SAMS to weakly adsorb the glycoprotein onto the electrode surface through their carbohydrate moiety. To prevent protein release from the electrode surface, we combine the affinity motif of boronates with the reactivity of epoxy groups to covalently link the protein to heterofunctional boronateepoxy SAMS. The principle underlying our strategy is the increased immobilization rate achieved by the weak interaction-induced proximity effect between slow reacting oxyrane groups in the SAM and nucleophilic residues from adsorbed proteins, which allows the formation of very stable covalent bonds. This approach is exemplified by the use of phenylboronates-oxyrane mixed monolayers as a reactive support and redox-enzyme horseradish peroxidase as glycoprotein for the preparation of peroxidase electrodes. Quartz crystal microbalance, atomic force microscopy, and electrochemical measurements are used to characterize these enzymatic electrodes. These epoxy-boronate functional monolayers; are versatile, stable interfaces, ready to incorporate glycoproteins by incubation under mild conditions.
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| 2. |
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| 3. |
- Ackermann, Thomas, et al.
(författare)
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An overview of wind energy-status 2002
- 2002
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Ingår i: Renewable & sustainable energy reviews. - 1364-0321 .- 1879-0690. ; 6:1-2, s. 67-128
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Forskningsöversikt (refereegranskat)
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| 4. |
- Ahmadian, Afshin, et al.
(författare)
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A brief history of genetic variation analysis
- 2002
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Ingår i: BioTechniques. - 0736-6205 .- 1940-9818. ; 32:5, s. 1122-
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Forskningsöversikt (refereegranskat)abstract
- As the human genome sequence is determined, there is an emerging need for the analysis of human sequence variations as genetic markers in diagnosis, linkage and association studies, cancer research, and pharmacogenomics. There are several different techniques and approaches for detecting these genetic variations, and here we review some of these techniques and their application fields. However, all the techniques have advantages and disadvantages, and factors such as laboratory instrumentation, personnel experience, required accuracy, required throughput, and cost often have to be taken into account before selecting a method.
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| 5. |
- Akerblom, H.K., et al.
(författare)
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Environmental factors in the etiology of type 1 diabetes
- 2002
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Ingår i: American Journal of Medical Genetics. - Hoboken, NJ, United States : John Wiley & Sons. - 0148-7299 .- 1096-8628. ; 115:1, s. 18-29
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Forskningsöversikt (refereegranskat)abstract
- Type 1 diabetes is considered to be an autoimmune disease in which T lymphocytes infiltrate the islets of pancreas and destroy the insulin producing beta cell population. Besides antigen specificity, the quality of immune reactivity against islet cell antigen(s) is an important determinant of the beta cell destruction. Much evidence indicates that the function of the gut immune system is central in the pathogenesis, as the regulation of the gut immune system may be aberrant in type 1 diabetes. The role of virus infections in the pathogenesis of type 1 diabetes has been supported by substantial new evidence suggesting that one virus group, enteroviruses, may trigger the beta-cell damaging process in a considerable proportion of patients. The latest evidence comes from studies indicating the presence of viral genome in diabetic patients and from prospective studies confirming epidemiological risk effect. If this association holds still true in ongoing large-scale studies, intervention trials should be considered to confirm causality. Of the dietary putative etiological factors, cow's milk proteins have received the main attention. Many studies indicate an association between early exposure to dietary cow's milk proteins and an increased risk of type 1 diabetes. The question will be answered by a large scale, prospective, randomized, international intervention trial Another dietary factor in need of more studies is the deficiency of vitamin D. Among toxins, N-nitroso compounds are the main candidates. An interaction of genetic and environmental factors is important in evaluating the possible role of a certain environmental factor in the etiology of type 1 diabetes. © 2002 Wiley-Liss, Inc.
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| 6. |
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| 7. |
- Akke, Mikael
(författare)
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NMR methods for characterizing microsecond to millisecond dynamics in recognition and catalysis
- 2002
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Ingår i: Current Opinion in Structural Biology. - 1879-033X. ; 12:5, s. 642-647
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Forskningsöversikt (refereegranskat)abstract
- During the past two years, significant advances have been made in the development of NMR methods for studying biomolecular dynamics on the microsecond to millisecond timescale. Applications of these methods to biologically relevant systems have provided compelling evidence that, in many cases, conformational dynamics on these timescales govern the rates of biomolecular recognition and catalysis.
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| 8. |
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| 9. |
- Albinsson, L., et al.
(författare)
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Staff opinions about the leadership and organisation of municipal dementia care
- 2002
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Ingår i: Health & Social Care in the Community. - : Hindawi Limited. - 0966-0410 .- 1365-2524. ; 10:5, s. 313-322
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Forskningsöversikt (refereegranskat)abstract
- The present study describes the opinions of experienced staff providing direct care to patients with dementia in municipal units in Sweden. The focus is mainly on leadership and other organisational factors. A purposeful sample of 31 staff members employed in municipal dementia care in both urban and rural areas in mid-Sweden were selected. Data were collected within a qualitative paradigm using semi-structured interviews which were tape-recorded and analysed using a modified phenomenographical approach. The nearly unanimous opinions of the interviewees indicated that there was a great lack of daily leadership in the units. Thus, few units had clearly formulated goals and few had regular care planning for their residents. Poorly developed teamwork was reported in the care of people with dementia especially regarding doctors, whose visits to the unit were too infrequent and too short, and did not include a direct exchange of information with other staff. In addition, little or no staff education and guidance/supervision was provided on a regular basis. In conclusion, without any unreasonable increase in cost, measures such as introducing clear leadership at the care unit level, concentrating on multi-professional teamwork, and providing education and guidance/supervision to the staff would probably result in better care for patients with dementia and their families.
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| 10. |
- Allen, John
(författare)
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Photosynthesis of ATP - Electrons, proton pumps, rotors, and poise
- 2002
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Ingår i: Cell. - 1097-4172. ; 110:3, s. 273-276
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Forskningsöversikt (refereegranskat)abstract
- Light-driven electron transport is coupled to ATP synthesis in chloroplasts. While the nature of the coupling and the structures of key components are now known, there has long been disagreement over pathways of electron transport. Recent results now put an old idea back on the agenda -cyclic electron transport around photosystem 1.
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