Showing papers by "University of Southern Denmark published in 1991"

Contact sensitization to 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one (MCI/MI). A European multicentre study.

Abstract: The frequency of positive reactions to 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one (MCI/MI) were studied at 22 European contact dermatitis clinics over a period of 1 year. A total of 4713 patients participated. All the patients were patch tested with nickel sulphate, formaldehyde, paraben-mix, and MCI/MI. 19.4% of the patients had positive patch tests to nickel, making this the most common allergen. 3% of the patients reacted to 100 ppm MCI/MI, while 2.6% reacted to formaldehyde and 1.1% to parabens. There was great variation in the frequency of MCI/MI sensitivity among the 22 centres. MCI/MI contact allergy was most common among women and in patients with facial dermatitis, while it was rarely seen in patients with dermatitis on the lower legs. There were no fluctuations in the number of positive patch tests to MCI/MI on a monthly basis when the results from all centres were combined. 117 of the 141 MCI/MI sensitized patients included in the study were retested. 88% had positive patch tests when retested. 101 of the MCI/MI-sensitive patients participated in a double-blind, placebo-controlled product use test. This test showed that 31% of the MCI/MI-sensitive patients had a positive reaction to a MCI/MI-preserved product. Only a few patients reacted to a control product. It is concluded that the preservative MCI/MI is an important new contact allergen.

Design of camp–CRP‐activated promoters in Escherichia coli

Abstract: We have studied the deoP2 promoter of Escherichia coli to define features that are required for optimal activation by the complex of adenosine 3',5' monophosphate (cAMP) and the cAMP receptor protein (CRP). Systematic mutagenesis of deoP2 shows that the distance between the CRP site and the -10 hexamer is the crucial factor in determining whether the promoter is activated by cAMP-CRP. Based on these observations, we propose that cAMP-CRP-activated promoters can be created by correctly aligning a CRP target and a -10 hexamer. This idea has been successfully tested by converting both a CRP-independent promoter and a sequence resembling the consensus -10 hexamer to strongly cAMP-CRP-activated promoters.

The secondary structure in solution of acyl-coenzyme A binding protein from bovine liver using 1H nuclear magnetic resonance spectroscopy.

Abstract: Acyl-coenzyme A binding protein from bovine liver and the protein expressed in Escherichia coli by the recombinant gene of this protein have been studied by two-dimensional 1H nuclear magnetic resonance spectroscopy. This protein has, in addition to the ability to bind acyl-coenzyme A, been reported to have several important physiological and biochemical functions. It is known as the diazepam binding inhibitor, as a putative neurotransmitter, as a regulator of insulin release from pancreatic cells, and as a mediator in corticotropin-dependent adrenal steroidogenesis. The only difference between the protein produced by recombinant techniques and the native acyl-coenzyme A binding protein is the N-terminal acetyl group present only in the native protein. The two proteins have 86 amino acid residues and a molecular mass of approximately 10,000 Da. Complete assignment of the 1H nuclear magnetic resonances has been obtained for a major proportion of the amino acid residues (55 residues), and partial assignment has been achieved for the others (31 residues). Sequential nuclear Overhauser effects have demonstrated that the protein has a secondary structure consisting of four alpha-helices of residues 1-15, 22-35, 52-60, and 68-85. Furthermore, a large number of long-range nuclear Overhauser effects have been identified, indicating that the assignment given here will provide a basis for a structure determination of this protein in solution by nuclear magnetic resonance spectroscopy.

The Parasitic Flagellates Trichomonas Vaginalis and Tritrichomonas foetus Produce Indole and Demethyl Sulphide: Direct Characterization by Membrane Inlet Mass Spectrometry

Abstract: The use of a membrane inlet triple quadrupole mass spectrometer revealed indole as an end product in the growth medium of cultures of the cattle parasite Tritrichomonas foetus and the human parasite Trichomonas vaginalis: formation of indole is enhanced in the presence of added tryptophan. Two different clinical isolates of Trich. vaginalis also produce dimethyl disulphide. Electron impact ionization yielded complex fragmentation mixtures, but the facility for analysis of daughter ions enabled unequivocal assignments. Chemical ionization gave [M + 1]+ species, and tandem mass spectrometry produced identification through daughter ions. The method provides a rapid single-step procedure for the characterization of microbial products without the need for preliminary separation and derivatization.

[Ulcer complications in the county of Funen during 1980-1990. Are there any changes in the frequency of hospitalization following the release of potent ulcer drugs for over-the-counter sale?].

Abstract: With the object of investigating whether the release of H2-blockers and sucralfate for over-the-counter sale in 1989 in Denmark and the simultaneous discontinuation of the general subsidy for potent ulcer medicine have had any influence on the frequency of hospitalisation for ulcer complications, the number of these were investigated in the County of Funen during a nine-year period prior to these alterations. The number of hospitalisations on account of ulcer complications during the first year after the alterations and thereafter were assessed on the basis of the prior tendency. In addition, the characteristics of the patients were assessed by a retrospective review of the case reports for the one-year periods before and after the alterations in the dispensing rules. The number of hospitalisations on account of ulcer complications in the County of Funen rose by 45% during the period 1.4.1980-31.3.1989. No increases in the number of hospitalisations after the alterations could be demonstrated. The number of patients admitted to Odense Hospital with ulcer complications and their characteristics are, similarly, unchanged after the alterations. Three case histories are, however, registered in which the alterations may have influenced the development of the ulcer complications. There appear to be good ground to continue registration of ulcer complications with the object of investigating the long-term consequences of these alterations particularly if potent ulcer medicine is used to a greater extent as over-the-counter medicine.