| 1. |
- Blenckner, Thorsten, et al.
(författare)
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Preface
- 2011
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Ingår i: Hydrobiologia. - : Springer Science and Business Media LLC. - 0018-8158 .- 1573-5117. ; 660:1, s. 1-2
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Tidskriftsartikel (refereegranskat)
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| 2. |
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| 3. |
- Gupta, Anil, et al.
(författare)
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Patient controlled regional analgesia after carpal tunnel release: a double-blind study using distal perineural catheters
- 2011
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Ingår i: JOURNAL OF HAND SURGERY-EUROPEAN VOLUME. - : Elsevier Science B. V., Amsterdam. - 1753-1934 .- 2043-6289. ; 36E:3, s. 219-225
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Tidskriftsartikel (refereegranskat)abstract
- This study was done to assess the efficacy of a perineural catheter for pain relief following carpal tunnel release (CTR). Sixty-six patients undergoing open CTR under local anaesthesia (LA) were randomly divided into three groups: Groups A and B had a perineural catheter and Group C served as non-blinded control group. Postoperative pain relief was by self-administration of either ropivacaine (Group A) or saline (Group B) via an elastometric pump and by oral paracetamol in Group C. Patients in Group A had a significantly greater difference in summed pain intensity than Group B. Fewer patients in Group A requested supplementary analgesics than in Group C. Patient satisfaction was higher in Group A than in Group B on day 1. However better analgesia was not associated with better functional recovery.
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| 4. |
- Naddafi, Rahmat, et al.
(författare)
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Physical and chemical properties determine zebra mussel invasion success in lakes
- 2011
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Ingår i: Hydrobiologia. - : Springer Science and Business Media LLC. - 0018-8158 .- 1573-5117. ; 669:1, s. 227-236
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Tidskriftsartikel (refereegranskat)abstract
- To address the question whether the abundance of an invasive species can be explained by physical and chemical properties of the invaded ecosystems, we gathered density data of invasive zebra mussels and the physical and chemical data of ecosystems they invaded. We assembled published data from 55 European and 13 North American lakes and developed a model for zebra mussel density using a generalized additive model (GAM) approach. Our model revealed that the joint effect of surface area, total phosphorus and calcium concentrations explained 62% of the variation in Dreissena density. Our study indicates that large and less productive North American lakes can support larger local populations of zebra mussels. Our results suggest that the proliferation of an exotic species in an area can partially be explained by physical and chemical properties of the recipient environment.
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| 5. |
- Naddafi, Rahmat, et al.
(författare)
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Predation and physical environment structure the density and population size structure of zebra mussels
- 2010
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Ingår i: Journal of The North American Benthological Society. - : University of Chicago Press. - 0887-3593 .- 1937-237X. ; 29:2, s. 444-453
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Tidskriftsartikel (refereegranskat)abstract
- The zebra mussel (Dreissena polymorpha) provides one example of successful invaders in novel environments. However, little attention has been devoted to exploring the factors regulating zebra mussel density and population size structure at the local scale. We tested effects of physicochemical factors and fish predation on the density of zebra mussels at several sites and between years in a natural lake. Water depth and roach (Rutilus rutilus) density were the most important variables affecting local zebra mussel density. Substrate was also an important factor but affected Dreissena density only at the shallowest depth examined (2 m), which also supported a large population of the mussels. Mean shell length of Dreissena increased with water depth. Our results indicate that predation pressure, intraspecific competition, and food limitation might be responsible for variation in zebra mussel density and population size structure in space and time and that fish predation might have strong top-down effects on zebra mussel populations.
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| 6. |
- Pierson, D. C., et al.
(författare)
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An automated method to monitor lake ice phenology
- 2011
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Ingår i: Limnology and Oceanography. - : Wiley. - 1541-5856. ; 9, s. 74-83
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Tidskriftsartikel (refereegranskat)abstract
- A simple method to automatically measure the date of ice-on, the date of ice-off, and the duration of lake ice cover is described. The presence of ice cover is detected by recording water temperature just below the ice/water interface and just above the lake bottom using moored temperature sensors. The occurrence of ice-on rapidly leads to detectible levels of inverse stratification, defined as existing when the upper sensor records a temperature at least 0.1 degrees C below that of the bottom sensor, whereas the occurrence of ice-off leads to the return of isothermal mixing. Based on data from 10 lakes over a total of 43 winter seasons, we found that the timing and duration of inverse stratification monitored by recording temperature sensors compares well with ice cover statistics based on human observation. The root mean square difference between the observer-based and temperature-based estimates was 7.1 d for ice-on, 6.4 d for ice-off, and 10.0 d for the duration of ice cover. The coefficient of determination between the two types of estimates was 0.93, 0.86, and 0.91, respectively. The availability of inexpensive self-contained temperature loggers should allow expanded monitoring of ice cover in a large and diverse array of lakes. Such monitoring is needed to improve our ability to monitor the progression of global climate change, and to improve our understanding of the relationship between climate and ice cover over a wide range of temporal and spatial scales.
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| 7. |
- Sagerfors, Marcus, MD, PhD, 1977-, et al.
(författare)
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Pyrolytic Carbon Hemiarthroplasty in the Management of Proximal Interphalangeal Joint Arthritis
- 2014
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Ingår i: 69th Annual Meeting of the ASSH.
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Konferensbidrag (refereegranskat)abstract
- Hypothesis: Arthroplasty remains an established motion preserving treatment for proximal interphalangeal (PIP) joint arthritis. The aim of this report is to review clinical, subjective and radiographic results of pyrocarbon hemi-arthroplasty in the treatment of PIP arthritis.Methods: 45 fingers in 40 patients underwent hemiarthroplasty between 2005 and 2011. Preoperative diagnoses included 30 with osteo or post-traumatic arthritis and 10 with inflammatory arthritis. The female to male ratio was 33:7. The average age at time of surgery was 56 years. The average follow-up period was 4.62 years. A student’s t-test was used to assess statistical significance.Results: To date there has been significant improvement in patient satisfaction measures including COPM (performance and satisfaction) scores and DASH as well as VAS pain scores. There was no significant change in ROM, grip and pinch strength following surgery. Four joints were revised for failure: 3 underwent salvage to succesful arthrodesis and another was converted to a silicone hinged PIP arthroplasty. Radiographic positions of the implant demonstrate a Sweets and Stern grade 0 in 44 implants to date and grade 3 in one.Summary Points: PIP pyrocarbon hemiarthroplasty appears to be a viable alter-native to PIP arthroplasty in the treatment of PIP joint arthritis. Clinical and patient satisfaction outcomes compare favorably with published outcomes of arthroplasty. Radiographic outcomes are encouraging with respect to implant positioning and loosening. Hemiarthroplasty affords a simpler procedure that preserves more bone stock which hopefully allows for better success of salvage options such as fusion and revision arthroplasty. Indications are still being refined and longer term outcomes will better validate its use.
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| 8. |
- Schroeder, Fabian, et al.
(författare)
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Temporal changes in periphytic meiofauna in lakes of different trophic states
- 2012
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Ingår i: Journal of limnology. - : PAGEPress Publications. - 1129-5767 .- 1723-8633. ; 71:1, s. 216-227
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Tidskriftsartikel (refereegranskat)abstract
- Meiofaunal organisms in the periphyton of stony hard-substrates (epilithon) were studied in three Swedish lakes with different trophic states (oligo-, meso- and eutrophic) with respect to seasonal successions in abundance, biomass, and production. Over a period of 2 years, the meiofaunal population of all three lakes fluctuated greatly, with densities varying up to nine-fold within a season. In the oligotrophic lake, a significant decrease in meiofauna in winter was striking, whereas in the other two lakes, richer in nutrients, there was a pronounced peak in early summer Although the lakes, on average, did not differ in epilithic organic and inorganic material, the differences in meiofaunal abundance, biomass, and production were significant. Correlation analysis revealed that altogether the meiofaunal biomass was positively related to the lakes trophic state (total phosphorus), while the meiofaunal abundance and production along the trophic spectrum displayed a humped-shape distribution, with maximum values measured in the mesotrophic Lake Erken (1324 ind cm(-2) and 2249 mu g DW cm(-2) y(-1)). Nematodes were the dominant meiofaunal group in the epilithon of all three lakes, accounting for up to 58% in abundance, 33% in biomass and 55% in production of the whole meiofaunal community. However their relative importance tended to decrease with increasing trophic state. Beside nematodes, rotifers, oligochaetes, copepods and tardigrades were also found in large numbers in the epilithon. Overall, the results demonstrated that, due to their high abundance, biomass, and production, meiofaunal organisms play an important role in epilithic communities.
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