| 1. |
- ABREU, P, et al.
(författare)
-
J/PSI-PRODUCTION IN THE HADRONIC DECAYS OF THE Z
- 1994
-
Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. ; 341:1, s. 109-122
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- J/psi mesons have been reconstructed from their decay to mu(+)mu(-) and e(+)e(-), using the data collected by the DELPHI experiment during 1991 and 1992 at the LEP collider. From about 1 million hadronic Z decays 153 +/- 17 J/psi were found, 5.4 +/- 2.3 p
|
|
| 2. |
- Pezron, I, et al.
(författare)
-
Monoglyceride surface films; Stability and interlayer interactions
- 1991
-
Ingår i: Journal of Colloid and Interface Science. - 0021-9797 .- 1095-7103. ; 144, s. 449-457
-
Tidskriftsartikel (refereegranskat)abstract
- Interactions between surfaces coated with monolayers of monoglycerides immersed in water have been studied using the surface force apparatus. The monolayers were deposited onto hydrophobized mica surfaces by means of the Langmuir-Blodgett techniqe. The measured forces beteween monopalmitin monolayers in the gel state show the existence of an adhesive minimum at a seperation of about 10 Å; this atttaction decreases when the temperature increases. At even shorter seperations a strong repulsion dominates the interaction. The forces between monoolein monolayers deposited in the liquid expanded state are repulsive at all separations and the range of the hydration/steric force is 10-15 Å. Deposited monolayers of monopalmitin in the gel state exhibit a good stability and remarkeble rehealing properties. In contrast, deposited monolayers of monoolein are unstable and readily transform into different structure.
|
|
| 3. |
- Westrin, BA, et al.
(författare)
-
A diaphragm diffusion cell applied to ethanol diffusion in agarose gel: A reproducibility study
- 1991
-
Ingår i: Biotechnology Techniques. - 0951-208X. ; 5:4, s. 303-306
-
Tidskriftsartikel (refereegranskat)abstract
- The effective diffusion coefficient of ethanol in a 4 %(w/v) agarose gel at 25-degrees-C was measured using a diaphragm diffusion cell. The reproducibility was very good; a standard deviation of only 2% was obtained. The mean value (9.5 x 10(-6) cm2/s) agreed well with available theory and previous investigations.
|
|
| 4. |
- Westrin, BA, et al.
(författare)
-
Diffusion in gels containing immobilized cells - A critical review
- 1991
-
Ingår i: Biotechnology and Bioengineering. - : Wiley. - 1097-0290 .- 0006-3592. ; 38:5, s. 439-446
-
Tidskriftsartikel (refereegranskat)abstract
- Eleven experimental investigations of diffusion in gels containing immobilized cells are reviewed. The experimental data, which quantitatively express the diffusion coefficient as a function of the cell concentration, are compared with a number of well-known equations developed for mass transfer in heterogeneous media. Based on this comparison, a procedure for the theoretical prediction of effective diffusion coefficients in cell-containing gels is recommended.
|
|
| 5. |
- Westrin, BA, et al.
(författare)
-
Diffusion measurement in gels
- 1994
-
Ingår i: Journal of Controlled Release. - : Elsevier BV. - 1873-4995 .- 0168-3659. ; 30:3, s. 189-199
-
Forskningsöversikt (refereegranskat)abstract
- Methods for measuring diffusion coefficients in gels are reviewed, and their capacities, limitations and requirements are briefly discussed. With four of these methods, i.e., the diaphragm cell, uptake/release from beads, holographic laser interferometry and nuclear magnetic resonance (FT-PGSE), a comparison is made with regard to accuracy and precision. The comparison is based on a number of studies in which the diffusion coefficient of ethanol in agarose gel has been measured. It is concluded that the diaphragm cell and nuclear magnetic resonance (FT-PGSE) are very accurate and precise.
|
|
