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| 4. |
- Barnes, PD, et al.
(författare)
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Observables in high-statistics measurements of the reaction (p)over-bar-p->(Lambda)over-bar-Lambda
- 1996
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Ingår i: PHYSICAL REVIEW C-NUCLEAR PHYSICS. - : AMER INST PHYSICS. - 0556-2813. ; 54:4, s. 1877-1886
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Tidskriftsartikel (refereegranskat)abstract
- Associated strangeness production has been studied in the <(p)over bar p> --> <(Lambda)over bar Lambda> --> <(p)over bar pi(+)> p pi(-) reaction at the CERN antiproton facility LEAR using the experimental setup of PS185. Results from two high-statistics m
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| 5. |
- Evangelista, C, et al.
(författare)
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Measurement of the (p)over-barp->KsKs reaction for 0.6 to 1.9 GeV/c
- 1997
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Ingår i: PHYSICAL REVIEW D. - : AMER INST PHYSICS. - 0556-2821. ; 56:7, s. 3803-3810
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Tidskriftsartikel (refereegranskat)abstract
- The <(p)over bar p> --> KSKS --> 4 pi(+/-) cross section was measured at incident antiproton momenta between 0.6 and 1.9 GeV/c using the CERN Low Energy Antiproton Ring. This investigation was part of a systematic study of in-flight antiproton-proton anni
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| 6. |
- Evangelista, C, et al.
(författare)
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Study of the reaction (p)over-bar-p ->phi phi from 1.1 to 2.0 GeV/c
- 1998
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Ingår i: PHYSICAL REVIEW D. - : AMERICAN PHYSICAL SOC. - 0556-2821. ; 57:9, s. 5370-5381
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Tidskriftsartikel (refereegranskat)abstract
- A study has been performed of the reaction <(p)over bar p>-->4K(+/-) using in-flight antiprotons from 1.1 to 2.0 GeV/c incident momentum interacting with a hydrogen jet target. The reaction is dominated by the production of a pair of phi mesons. The <(p)o
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| 11. |
- Schmitt, F-J, et al.
(författare)
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Direct force measurements on bulk polystyrene using the bimorph surface forces apparatus
- 1999
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Ingår i: Journal of Adhesion Science and Technology. - 0169-4243 .- 1568-5616. ; 13, s. 79-96
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Tidskriftsartikel (refereegranskat)abstract
- Interfacial properties of bulk polymer samples have been characterized by direct measurements of long-range and adhesion forces using a non-interferometric bimorph surface forces apparatus. For this purpose we developed a method where bulk polystyrene was melted and formed into drop-shaped surfaces with a cylindrical shaft. In the case of very smooth polystyrene samples the adhesion in air and water was very strong and when brought into contact a cold welding of the polymers sometimes took place. Upon separation, it was found that a cohesive failure occurred and the surfaces were locally damaged. In the case of less flat polystyrene surfaces, the adhesion increased with the applied (external) load to a saturation value. We attribute this to a local flattening of nanometer sized protrusions. The long-range interaction in water is dominated by a weak electrostatic double-layer force. At separations below about 10 nm, an attractive force component predominates the interaction. The adhesion in aqueous solutions decreased dramatically in the presence of a nonionic surfactant, n-octyl b-D-glucopyranoside. The surfactant adsorbs onto hydrophobic surfaces, such as the polystyrene surface used here, and close to the critical micellar concentration it forms an oriented monolayer where the polar sugar units are directed towards the solution. The range of the short-range repulsion between polystyrene surfaces coated with a monolayer of n-octyl b-D-glucopyranoside is about 2-3 nm, slightly larger than observed previously for such surfactant layers adsorbed onto very flat hydrophobized mica surfaces. Further, a considerably stronger attractive force is observed upon separation of the surfactant coated surfaces in case of polystyrene compared to when hydrophobized mica is used. The influence of the substrate surface on the interaction can be rationalized by their differences in surface roughness.
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| 13. |
- Thomson, Neil H., et al.
(författare)
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Oriented, active Escherichia coli RNA polymerase : an atomic force microscope study
- 1999
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Ingår i: Biophysical Journal. - 0006-3495 .- 1542-0086. ; 76:2, s. 1024-1033
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Tidskriftsartikel (refereegranskat)abstract
- RNA polymerase (RNAP) molecules to be imaged under aqueous buffer using tapping-mode atomic force microscopy (AFM). Recombinant RNAP molecules containing histidine tags (hisRNAP) on the C-terminus were specifically immobilized on ultraflat gold via a mixed monolayer of two different Ω-functionalized alkanethiols. One alkanethiol was terminated in an ethylene-glycol (EG) group, which resists protein adsorption, and the other was terminated in an N-nitrilotriacetic acid (NTA) group, which binds the histidine tag through two coordination sites with a nickel ion. AFM images showed that these two alkanethiols phase-segregate. Specific binding of the hisRNAP molecules was followed in situ by injecting proteins directly into the AFM fluid cell. The activity of the hisRNAP bound to the NTA groups was confirmed with a 42-base circular single-stranded DNA template (rolling circle), which the RNAP uses to produce huge RNA transcripts. These transcripts were imaged in air after the samples were rinsed and dried, since RNA also has low affinity for the EG-thiol and cannot be imaged under the buffers we used.
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