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Keywords: gozdarstvo, vodovarstvene usmeritve
Published in DiRROS: 02.10.2025; Views: 307; Downloads: 78
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Abstract: Na Tolminskem gozdnogospodarskem območju smo v treh popisih objedenosti gozdnega mladja v letih 2016, 2020 in 2024 na istih 114 ploskvah ugotavljali dinamiko številčnosti gozdnega mladja ter kako mladje med tremi popisi prerašča v višino. Frekvenčna struktura števila mladja se je med tremi popisi značilno spremenila tako v skupnem kakor med skupinami drevesnih vrst in med skupinami gozdnogospodarskih enot. Med tremi popisi se je število mladja zmanjšalo, zmanjšalo se je tudi znotraj prvega in drugega višinskega razreda, dočim se je znotraj naslednjih treh višinskih razredov število mladja povečalo. Zmanjševanje oziroma povečevanje števila mladja znotraj višinskih razredov je med tremi popisi različno po skupinah drevesnih vrst, različno je tudi po skupinah gozdnogospodarskih enot, kjer pa so razlike manjše. Ugotovili smo negativno povezavo med stopnjo objedanja in višinskim preraščanjem. Najmanj objedena sta smreka in bukev, ki tudi najbolje preraščata v višino. S povečevanjem objedanja se zmanjšuje število mladja v vseh višinskih razredih.
Keywords: Tolminsko gozdnogospodarsko območje, gozdno mladje, višinsko preraščanje, višinski razredi, objedanje zaradi rastlinojedov
Published in DiRROS: 02.10.2025; Views: 310; Downloads: 78
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Keywords: bamboo fiber, SEM, magnesium hydroxide, durability, mechanical properties
Published in DiRROS: 02.10.2025; Views: 249; Downloads: 102
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Abstract: Objective: The aim of our study was to compare the total 25(OH)D fraction, the bioavailable vitamin fraction, and the free vitamin D fraction in spring and fall in a group of healthy individuals. Methods: In our study, we collected blood samples from healthy participants at the end of both summer and winter, and measured serum levels of albumin, DBP, and 25(OH)D. Utilizing these data, we calculated the percentage of free and bioavailable vitamin D. Our cohort comprised 87 participants, with a maleto- female ratio of 14:73, aged 35.95 ± 12.55 years, ranging from 19 to 70 years. We employed the chemiluminescence method to determine the vitamin 25(OH)D levels, the ELISA method was utilized to determine DBP levels, the albumin BCP Assay was performed using the ADVIA biochemical analyzer (Siemens) and an online calculator was used to determine the free and bioavailable 25(OH)D levels. Results: Our findings indicate significantly lower 25(OH)D levels in winter (44.13 ± 17.82 nmol/L) compared to summer (74.97 ± 22.75 nmol/L; p < 0.001). For vitamin D binding protein there was no significant difference from summer (236.2 ± 164.39 mg/L) to winter (239.86 ± 141.9 mg/L; p = 0.77), albumin levels were significantly higher in summer (49.37 ± 4.15 g/L vs. 47.97 ± 3.91 g/L, p = 0.01), but the magnitude of the change may not be large enough to be solely responsible for the stability of vitamin D levels throughout the year. In the winter season a significantly lower calculated bioavailable 25(OH)D vitamin (7.45 ± 5.66 nmol/L against 13.11 ± 8.27 nmol/L; p < 0.001) was observed, and the free fraction also showed a significant decrease (17.3 ± 12.9 pmol/L versus 29.7 ± 19.1 pmol/L; p < 0.0001). We observed a moderately positive correlation between 25(OH)D and bioavailable percentage in winter (r = 0.680; p < 0.001), in contrast with a lower positive association in summer (r = 0.343; p < 0.001). Conclusion: Our data suggest a positive correlation between total and bioavailable 25(OH)D levels. In addition to the statistically significant variation in 25(OH)D between the two observation periods, there was an additional variation in the free vitamin D percentage. The summertime synthesis of vitamin D in the skin could contribute directly to the free fraction of vitamin D. Standardizing the measurement of free 25(OH)D and clinical studies is necessary to establish reference values before these methods can be implemented in clinical practice.
Keywords: body mass index, ultraviolet, D3, cholecalciferol, D2, ergocalciferol, total 25(OH)D, 25-hydroxycholecalciferol, calcifediol, calcidiol, 25-hydroxyvitamin, 1, 25-(OH)D, 1, 25-dihydroxyvitamin D, vitamin D binding protein, Odds ratio
Published in DiRROS: 02.10.2025; Views: 290; Downloads: 131
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Keywords: large language models, food ontology, food data, named-entity linking
Published in DiRROS: 02.10.2025; Views: 290; Downloads: 0
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