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- Bengtsson, Calle, 1934, et al.
(författare)
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Diabetes incidence in users and non-users of antihypertensive drugs in relation to serum insulin, glucose tolerance and degree of adiposity: a 12-year prospective population study of women in Gothenburg, Sweden
- 1992
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Ingår i: Journal of Internal Medicine. ; 231, s. 583-588
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Tidskriftsartikel (refereegranskat)abstract
- Department of Primary Health Care, Sahlgrenska Hospital, Gothenburg University, Sweden. As part of a prospective population study in Gothenburg, Sweden, women aged 50 years were subjected to an intravenous glucose tolerance test on entry to the study and followed up for 12 years. Manifest diabetes was the only end-point registered in this part of the study. Of 352 initially non-diabetic women, 17 (4.8%) subjects developed diabetes, with a fourfold increased risk in women taking antihypertensive drugs (diuretics or beta-blockers, or both) compared with women who were not taking such medication. The increased risk was observed independently of initially measured glucose metabolism variables and degree of adiposity, although the incidences were higher overall if the use of antihypertensive drugs was combined with fasting hyperinsulinaemia and adiposity. This study provides further evidence to support the view that diuretics and beta-blockers are precipitators of type 2 diabetes mellitus. PMID: 1352324 [PubMed - indexed for MEDLINE]
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| 3. |
- Bengtsson, Göran, et al.
(författare)
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Patchiness and compensatory growth in a fungus-Collembola system
- 1993
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Ingår i: Oecologia. - 0029-8549. ; 93:2, s. 296-302
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Tidskriftsartikel (refereegranskat)abstract
- The compensatory growth potential of a grazed fungal biomass was mathematically expressed as a function of patchiness in its distribution and demonstrated in an experiment using the fungivorous collembolan Onychiurus armatus and the soil fungi Verticillium bulbillosum and Penicillium spinulosum. The model addresses the regrowth potential in relation to patch fragmentation, travelling time and consumption rate of the collembolan and the mean relative growth rate of the fungus. It suggests that the mean relative growth rate required for regrowth decreases with patch fragmentation and increases with the mean growth rate of the fungus. The experiments were performed with a system of soil-filled vials provided with fungi and collembolans. The size of the vials and the length of the tubes connecting them were varied to give different patch sizes and travelling times. The respiratory activity of fungi after grazing increased as a unit of mycelium was distributed into smaller connected vials. The slow growing species V. bulbillosum showed a greater but delayed response to grazing in comparison with the fast growing P. spinulosum. An increased travelling time delayed the growth response in both species.
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| 4. |
- Bengtsson, Göran, et al.
(författare)
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Selective odor perception in the soil collembola Onychiurus armatus
- 1991
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Ingår i: Journal of Chemical Ecology. - 0098-0331. ; 17:11, s. 2113-2125
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Tidskriftsartikel (refereegranskat)abstract
- The olfactorial response of the fungivorous soil collembolan Onychiurus armatus was examined in a bioassay covering volatile compounds identified in the odor blends of two of its preferred fungal species Monierella isabellina and Verticillium bulbillosum. The odor of the fungi was trapped using activated carbon filters, extracted with diethyl ether, and subjected to GC-MS analysis. About 50% of the compounds resolved by GC were identified by a combination of electron impact and chemical ionization mass spectrometry. In a Y-shaped olfactometer the collembolans were attracted to a variety of common odors, such as CO2 and 2-methyl-1-propanol, and a species-specific odor, such as 1-heptene, and arrested by, for example, decanal and 2-octene. The response was not improved by pairwise combinations of common and specific odors. An amount of 0.5 ng of ethyl acetate or 3 pg of 1-pentanol was sufficient to attract the collembolans. The specific compounds of V. bulbillosum, 1-heptene and 1-octen-3-ol, may be key stimuli explaining why O. armatus prefers V. bulbillosum.
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| 6. |
- Bengtsson, Lars, et al.
(författare)
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Urban snowmelt and runoff in northern Sweden
- 1992
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Ingår i: Hydrological Sciences Journal. - : Informa UK Limited. - 0262-6667 .- 2150-3435. ; 37:3, s. 263-275
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Tidskriftsartikel (refereegranskat)abstract
- Snowmelt and runoff in urban areas in Lulea, north Sweden, are discussed and compared with rural conditions. The uneven snow distribution in cities is quantified. Energy fluxes at the snow surface in different environments are estimated. It is shown that, mainly because of increased absorbed radiative energy in the snow, the daily melt is about 10 mm higher in the city than in rural environments. In the course of prolonged snowmelt, the infiltration capacity of most soils in urban areas becomes so reduced that melt-induced peak flows from grassed and gravelled surfaces are similar to those from asphalted surfaces. When rain falls on snow, overland flow may take place from the entire area of a basin.
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| 7. |
- Kristjansson, Karl, 1958, et al.
(författare)
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The interrelationships between fasting serum insulin level, obesity and blood pressure in women: Results from a cross-sectional population study of women in Gothenburg, Sweden
- 1993
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Ingår i: Hypertension Research. - 1348-4214. ; 16:3, s. 197-201
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Tidskriftsartikel (refereegranskat)abstract
- This study is based on a representative population sample of women in Gothenburg, Sweden. Three hundred and thirty-six 50-year-old nondiabetic women, not taking any antihypertensive medication, were included in the study. They underwent a comprehensive examination programme, where body weight, body height, waist and hip circumferences, systolic and diastolic blood pressures and fasting serum insulin concentration were measured. Fasting serum insulin concentration was significantly correlated with systolic and diastolic blood pressures. After controlling for both body mass index (BMI) and waist to hip circumference ratio (WHR), fasting serum insulin concentration remained independently associated with blood pressure (P=0.001 for systolic blood pressure, P=0.06 for diastolic blood pressure). When stratified for BMI or WHR the correlations between fasting serum insulin concentration and blood pressure remained significant only in the upper 50th precentiles of BMI and WHR. When relating pressure to different levels of fasting serum insulin concentration there seems to be a threshold at an insulin concentration corresponding to the upper quartile limit (at approximately 17μU/ml), above which level the blood pressure rises more obviously. The same phenomenon was seen for systolic and diastolic blood pressures.
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