| 1. |
- Abrams, P, et al.
(author)
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The future of urology
- 2012
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In: European urology. - : Elsevier BV. - 1873-7560 .- 0302-2838. ; 61:3, s. 534-540
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Journal article (other academic/artistic)
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- Chaussy, CG, et al.
(author)
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Engineering Better Lithotripters
- 2015
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In: Current urology reports. - : Springer Science and Business Media LLC. - 1534-6285 .- 1527-2737. ; 16:8, s. 52-
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Journal article (peer-reviewed)
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| 12. |
- He, ZC, et al.
(author)
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Composition of Urine Collected from Non-Stone-Forming Chinese Persons during Different Short-Term Periods of the Day
- 2022
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In: Urologia internationalis. - : S. Karger AG. - 1423-0399 .- 0042-1138. ; 106:3, s. 227-234
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Journal article (peer-reviewed)abstract
- The purpose of this study in a small group of non-stone-forming Chinese persons was to measure the levels of supersaturation with calcium oxalate and calcium phosphate and pH with the aim of confirming if any of the different short-term urine samples were better for risk evaluation than a 24-h sample. Nine normal men and 1 woman collected urine during 4 periods of the day. <i>Period 1</i> between 08 and 12 h, <i>Period 2</i> between 12 and 18 h, <i>Period 3</i> between 18 and 22 h, and <i>Period 4</i> between 22 and 08 h. Each sample was analysed for calcium, oxalate, citrate, magnesium and phosphate, and estimates of supersaturation with calcium oxalate (CaOx) and calcium phosphate (CaP) were expressed in terms of AP(CaOx) and AP(CaP) index. An estimate of the solute load of CaOx was also calculated. Urine composition for 24-h urine (<i>Period 24</i>) was obtained mathematically from the analysed variables. Urine composition corresponding to 14-h urine portions 22–12 h (<i>Period 14</i>N) and 08–22 h (<i>Period 14 D</i>) were calculated. The lowest pH levels were recorded in <i>Period 1</i> urine. The highest level of AP(CaOx) index was recorded during <i>Period 1</i>, and the product AP(CaOx) index × 10<sup>7</sup> × hydrogen ion concentration was significantly higher in Period 1 urine than in 24-h urine (<i>p</i> = 0.02). Also, the product SL(CaOx) × 10<sup>7</sup> × hydrogen ion concentration was significantly higher in <i>Period 1</i> urine (<i>p</i> = 0.02). Low AP (CaP) index levels were recorded in <i>Period 4</i>, but also in all periods following dietary loads of calcium and phosphate. With the important reservation that the analytical results were obtained from non-stone-forming persons, the conclusion is that analysis of urine samples collected between 08 and 12 h might be an alternative to 24-h urine. The risk evaluation might advantageously be expressed either in terms of the product AP(CaOx) index × 10<sup>7</sup> × hydrogen ion concentration or the product SL(CaOx) × 10<sup>7</sup> × hydrogen ion concentration.
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| 14. |
- Hojgaard, I, et al.
(author)
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Crystallization during volume reduction of solutions with a composition corresponding to that in the collecting duct : the influence of hydroxyapatite seed crystals and urinary macromolecules
- 1999
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In: Urological research. - 0300-5623 .- 1434-0879. ; 27:6, s. 417-425
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Journal article (peer-reviewed)abstract
- To examine the effect of hydroxyapatite (HAP) seed crystals and urinary macromolecules on the crystallization under conditions similar to those in the collecting duct,we evaporated 100 ml samples of salt solutions with an ion composition assumed to correspond to that in the collecting duct without and with HAP seed crystals. The crystallization in seeded solutions was assessed both with and without dialysed urine (dU). After evaporation the number and volume of crystals were recorded in a Coulter Multisizer and the crystal morphology examined with scanning electron microscopy (SEM) and X-ray crystallography. Addition of HAP crystals was apparently followed by an approximately 15-20% increase in heterogeneous nucleation of calcium oxalate (CaOx). In these experiments SEM and X-ray crystallography showed a high percentage of CaOx in the precipitate. In samples reduced to 40-69 ml, addition of dU to the collecting duct solution containing HAP seed resulted in a greater mean (SD) number of crystals, 3895 (1841) in samples with dU and 1785 (583) in samples without. This was mainly explained by an increased mean (SD) number of small crystals. The mean crystal volume was 17.8 (1.1) and 34.3 (9.1) in samples reduced to 40-69 mi with and without dU, respectively. This might reflect the inhibitory effect of dU on the growth and/or aggregation of the CaOx-CaP precipitate or a promoted nucleation resulting in a large number of small crystals. It is concluded that calcium phosphate formed above the collecting duct might induce heterogeneous nucleation of CaOx at lower levels of the renal collecting system, and that urinary macromolecules are powerful modifiers of these processes.
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| 16. |
- Hojgaard, I, et al.
(author)
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Crystallization in the nephron
- 1999
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In: Urological research. - : Springer Science and Business Media LLC. - 0300-5623 .- 1434-0879. ; 27:6, s. 397-403
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Research review (peer-reviewed)
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| 17. |
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| 18. |
- Hojgaard, I, et al.
(author)
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The effect of pH changes on the crystallization of calcium salts in solutions with an ion composition corresponding to that in the distal tubule
- 1999
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In: Urological research. - 0300-5623 .- 1434-0879. ; 27:6, s. 409-416
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Journal article (peer-reviewed)abstract
- The effect of pH changes on the crystallization in solutions with an ion composition assumed to correspond to that of urine in the distal part of the distal tubule was examined by recording the number and volume of crystals with a Coulter Multisizer and by studying the crystal morphology with scanning electron microscopy at different degrees of volume reduction. The experiments were carried out with 100 ml samples at different starting pH values without and with 20% of dialysed urine (dU). The number of crystals increased in response to the volume reduction. In solutions without dU, 100 or more crystals with a diameter in the range 2.4-45 mu m were observed already at a volume reduction of 40% when the initial pH was 7.28. For solutions with a pH of 5.80 and 6.45 the corresponding values were 60% and 80%, respectively. In the presence of dU, an appearance of crystals was recorded at volume reductions of less than 20%. In solutions with an initial pH of 5.80 and 6.45, the crystal number was greater with dU than without, such a difference was not recorded at pH 7.28. In samples containing dU, the mean crystal volume (MCV) varied very little when the sample volume was reduced. The same was found in solutions without dU when the initial pH was 5.80 and 7.28, whereas the MCV was greater in the samples with pH 6.45. Scanning electron microscopy of solutions reduced to 30-40% of the original volume showed that calcium phosphate had formed in solutions with a starting pH of 7.28 and 6.45. In solutions with pH 5.80 calcium oxalate crystals were observed with calcium phosphate.
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| 24. |
- Khan, SR, et al.
(author)
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Kidney stones
- 2016
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In: Nature reviews. Disease primers. - : Springer Science and Business Media LLC. - 2056-676X. ; 2, s. 16008-
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Journal article (peer-reviewed)
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| 45. |
- Tiselius, HG, et al.
(author)
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Editorial comment
- 2019
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In: Urolithiasis. - : Springer Science and Business Media LLC. - 2194-7236 .- 2194-7228. ; 47:3, s. 217-218
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Journal article (other academic/artistic)
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| 46. |
- Tiselius, HG, et al.
(author)
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Editorial comment
- 2020
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In: Urolithiasis. - : Springer Science and Business Media LLC. - 2194-7236 .- 2194-7228. ; 48:4, s. 283-284
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Journal article (other academic/artistic)
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