Impact of a participatory organizational intervention on job characteristics and job stress.

Increased employee control and participation are recommended to achieve both "flexible organization" and improvements in health, as outlined in occupational stress intervention models. This study evaluates the impact of a participatory organizational intervention on job stress and job characteristics. The intervention was carried out in two post offices in the Norwegian Postal Service.

Presence and dehydration of ikaite, calcium carbonate hexahydrate, in frozen shrimp shell.

Ikaite, calcium carbonate hexahydrate, has by means of X-ray diffraction analyses of frozen samples been identified as the mineral component of the white spots formed in the shell of frozen shrimp during storage. When the shrimp thaw and the shell material is dried and kept at room temperature, ikaite rapidly transforms into a mixture of anhydrous calcium carbonate forms. X-ray diffraction analyses and Raman spectra of synthetic ikaite as well as the dehydration product confirm the assignments, and the rate constant for dehydration is approximately 7 x 10(-)(4) s(-)(1) at ambient temperature.

A Danish national cohort of 730 infants born after intracytoplasmic sperm injection (ICSI) 1994-1997.

This national cohort study included all clinical pregnancies obtained after intracytoplasmic sperm injection (ICSI) registered in Denmark between January 1994 and July 1997 at five public and eight private fertility clinics. Laboratory and clinical data were obtained from the fertility clinics. The couples answered a questionnaire regarding the pregnancy and the health of the child (response rate 94%).

In-vitro maturation of human oocytes from regularly menstruating women may be successful without follicle stimulating hormone priming.

This prospective randomized study investigated whether the developmental potential of in-vitro matured (IVM) human oocytes is improved by follicle stimulating hormone (FSH) priming before aspiration. Normally cycling women were recruited among couples referred for in-vitro fertilization or intracytoplasmic sperm injection because of male factor and/or tubal disease. In the first experiment, 20 women were randomly allocated to either no stimulation (n = 10) or stimulation for 3 days with rec-FSH (Gonal-F, Serono) at a fixed dose of 150 IU/day from day 3 (n = 10).

Transient electric birefringence of human erythroid spectrin dimers and tetramers at ionic strengths of 4 mM and 53 mM.

In conventional electrooptic studies the sample ionic strength must for technical reasons be kept below about 3 mM, which is only 2% of the ionic strength at physiological conditions. In particular for flexible polyelectrolytic macromolecules it can in general not be ruled out that both the conformational average and dynamics at ionic strength 3 mM and below may differ significantly from what it is at physiological conditions. Here we report on the first electrooptic study of human erythroid spectrin dimers and tetramers at ionic strengths higher than 3 mM.

A prospective, randomized, double-blind clinical trial to study the efficacy and efficiency of a fixed dose of recombinant follicle stimulating hormone (Puregon) in women undergoing ovarian stimulation.

A prospective, randomized, double-blind, multicentre (n = 5) study was conducted to compare the influence of either a 100 or 200 IU daily fixed-dose regimen of recombinant follicle stimulating hormone (FSH) on the number of oocytes retrieved and the total dose used in down-regulated women undergoing ovarian stimulation. Fertilization was done by intracytoplasmic sperm injection or conventional in-vitro fertilization. A total of 199 women were treated with FSH, 101 subjects with 100 IU and 98 subjects with 200 IU.

Electric birefringence of recombinant spectrin segments 14, 14-15, 14-16, and 14-17 from Drosophila alpha-spectrin.

Members of the spectrin protein family can be found in many different cells and organisms. In all cases studied, the major functional role of these proteins is believed to be structural rather than enzymatic. All spectrin proteins are highly elongated and consist mainly of homologous repeats that constitute rigid segments connected in tandem.

Metmyoglobin reductase activity in porcine m. longissimus dorsi muscle.

Reduction of metmyoglobin by metmyoglobin reductase extracted from porcine m. longissimus dorsi was found to depend on the presence of NADH and to a lesser degree on the presence of an electron transfer mediator (ferrocyanide). The porcine metmyoglobin reductase was found to reduce equine metmyoglobin and metmyoglobin isolated from pigs hearts using a method described for bovine metmyoglobin.

Electrooptic analysis of macromolecule dipole moments using asymmetric reversing electric pulses.

The use of symmetric reversing electric field pulses in electrooptic studies of rigid macromolecules in order to determine the ratio between the permanent and the induced dipole moments is well established. Application of this method to studies of small macromolecules requires a field reversal time of only a few nanoseconds. No high current pulse generator capable of producing symmetric kV pulses with such a short reversal time is available for studies of small macromolecules in physiological salt solutions, but it has long been known how to make such reversing pulses that are asymmetric.

Resumption of mitosis during post-thaw culture: a key parameter in selecting the right embryos for transfer.

This retrospective study of 701 thaw cycles analysed the clinical importance of whether or not embryos resumed mitosis during 24 h of post-thaw culture. A total of 3360 frozen embryos were thawed; 1922 embryos survived the freeze-thaw procedure with at least one intact blastomere and were then cultured for 24 h before transfer. All transfers were registered into either the 'cleaved embryo group' (n = 459), which was defined as transfers where at least one of the transferred embryos cleaved during the post-thaw culture period, or the 'non-cleaved embryo group' (n = 153), where none of the transferred embryos cleaved during the post-thaw culture period.

Results of intracytoplasmic sperm injection in relation to indication.

Background: Intracytoplasmic sperm injection (ICSI) was first introduced as a treatment to couples that were infertile due to severe male factors. Later, the ICSI technic has also been used on other indications like low or no fertilization in previous IVF cycles.

Methods: A total of 262 ICSI cycles performed in 180 patients were reviewed and the results related to the indications.

Intracytoplasmic sperm injection does not overcome an oocyte defect in previous fertilization failure with conventional in-vitro fertilization and normal spermatozoa.

A cohort comprising a total of 447 oocyte aspirations due to male factors (n = 258) or to previous fertilization failure by IVF in the presence of normal sperm parameters (n = 189) was studied. We found a significantly reduced implantation and pregnancy rate per transfer in the group with previously failed IVF attempts compared to the male factor group (P < 0.001).

Results of serial measurement of estradiol in serum with six different methods during ovarian stimulation.

The aim of the study was to assess the values of serum estradiol (E2) in women undergoing ovarian stimulation with five direct commercial assays (IMX, Amerlite, Spectria, Vidas, CA) and to compare them with the results of an E2 direct method used in our laboratory. The study included 12 infertile women. Thirteen cycles were monitored daily during ovarian stimulation with transvaginal ultrasound and serum E2.

Acid-catalysed reduction of ferrylmyoglobin: product distribution and kinetics of autoreduction and reduction by NADH.

The pH dependence of iron(II)/iron(III) product distribution, following reduction of the hypervalent iron in equine ferrylmyoglobin by the protein moiety of the pigment (so-called autoreduction) and by NADH (nicotinamide adenine dinucleotide, reduced) and the rate of reduction was found to depend different on pH. Autoreduction is specific acid catalysed and has a more modest temperature dependence than autoxidation of oxymyoglobin, with the activation parameters delta H# = 58.5 +/- 0.

Clinical effects of preoperative oestradiol treatment before vaginal repair operation. A double-blind, randomized trial.

The objective of the study was to assess the effects of low-dose vaginal treatment with oestradiol before vaginal operation. In a double-blind randomized study including 43 postmenopausal women scheduled for vaginal repair operation for genital descensus, it was found that 7 patients suffered from concomitant urinary stress incontinence. Vagifem (25 micrograms oestradiol) or placebo was administered as vaginal pessaries daily, 3 weeks prior to surgery and the clinical effects evaluated.

The value of peroperative ultrasound examination in first trimester legally induced abortion.

A prospective study was carried out based on 117 first trimester legally induced abortions. Abdominal ultrasound examination was performed immediately after aspiration. The predictive value of an empty uterus at ultrasound examination was 97.

Mast cells in the placenta. Is there a relation to the development of atopic disease in infants before 18 months of age?

Objective: To disclose a relation between the amount of mast cells in placenta and the development of atopic disease in children before 18 months of age.

Design: A prospective, descriptive study.

Setting: Two obstetric departments at university hospitals.

Preoperative treatment with oestradiol in women scheduled for vaginal operation for genital prolapse. A randomised, double-blind trial.

Objective: To disclose a clinical and histopathological effect of local low-dose oestradiol treatment on the vagina.

Design: A randomised, double-blind trial.

Setting: Two gynaecological departments at University Hospitals.

Psychosocial determinants of climacteric complaints.

A total of 2349 Norwegian women aged 45-55 years, were investigated using postal questionnaires. Associations between menopausal development, psychosocial factors and climacteric complaints were analyzed. Factor analysis of 24 climacteric complaints identified five factors (vague somatic complaints, nervous complaints, mood lability, vasomotor and urogenital complaints) which were analyzed in relation to stage of menopausal development and a number of psychosocial variables.

The menopausal syndrome: a factor analytic replication.

The authors contend that conclusions regarding the existence of a menopausal syndrome based on clinical trials with oestrogen therapy cannot be generalized to the general population. As an alternative strategy for investigating the nature of the menopausal syndrome the authors performed a factor analysis of the results from a symptom checklist. The list was included in a postal questionnaire sent to a representative sample of 2349 women aged between 45 and 55 years residing in the city of Oslo, Norway.

Changes in plasmaconcentration of ANP and aldosterone in normal pregnancy and pregnancy complicated by pre-eclampsia.

Changes in plasmaconcentration of ANP in normal pregnancy and pregnancy complicated by pre-eclampsia were examined and compared to non-pregnant controls. The maternal plasma concentration increased gradually during normal pregnancy but values did not deviate significantly from non-pregnant women. A further increase was demonstrated post partum.

Plasma concentration of atrial natriuretic peptide in normal pregnant women and in pregnant women with preeclampsia.

Plasma concentration of atrial natriuretic peptide (ANP) was determined in pregnant women with preeclampsia, in normal pregnant and in nonpregnant women by a specific radioimmunoassay. Results did not show important differences between nonpregnant controls and normal pregnant women, but a significant rise was seen in women with preeclampsia compared to nonpregnant controls. Marked interindividual variation was found in all three groups.