Histological and morphometric aspects of ridge preservation with a moldable, in situ hardening bone graft substitute

Biphasic calcium phosphates (BCP) are widely used in alveolar ridge regeneration as a porous scaffold for new bone formation. The aim of this case series was to evaluate the regenerative effect of the combination of BCP and polylactide-co-glycolide (PLGA) which can serve as a barrier membrane during bone regeneration. The study included five patients. Four months into the healing period, bone samples were collected for histological and morphometric analyses. The results of morphometric analysis showed that newly formed bone represented 32.2 ± 6.8% of the tissue, 31.9 ± 8.9% was occupied by residual graft and 35.9 ± 13.5% by soft tissue. Active osteogenesis was seen around the particles of the graft. The particles were occupied mostly by immature woven bone and connective tissue. The quality and quantity of newly formed bone, after the use of BCP/PLGA for ridge preservation, can be adequate for successful implant therapy after tooth extraction.Projekat ministarstva br. OI 175021 i br. OI 17300

Ukopi životinja na Vučedolu

Prilikom najnovijih istraživanja lokaliteta Vučedol-«Vinograd Streim» otkriven je niz životinjskih ukopa. Pokapanje životinja u Karpatskoj kotlini sve je češće od početka prema kraju eneolitika. Ta se pojava povezuje s počecima društvenog raslojavanja, povećavanja značaja govedarstva i lova, te pratećih kultova. Situacija na Vučedolu predstavlja jedan od vrhunaca tog procesa

Diversity of vascular flora of lowland forests of ravni Srem

Kako su plavne šume u Evropi vrlo fragilni ekosistemi i povećava se njihova ugroženost prevashodno antopopresijom, postoji rastuća potreba za povećanjem obima stavljanja sastojina ovih šuma pod specijalni režim zaštite. Upravo sprovdena, floristička i ekološka istraživanja u ovoj disertaciji obezbeđuju jednu širu ekološku osnovu za zaštititu prirodnih vrednosti ovih šuma i održivi menadžment nizijskih šumskih ekosistema, distribuiranih u plavnom i izvanplavnom području Ravnog Srema, ali i šre u svakom drugom šumskom području koje pripada kompleksu aluvijalnih higrofilnih šuma. Da bi se detektovala i analizirala bazična floristička diferencijacija tipološki izdvojenih jedinca šumske vegetacije, primenjeno je shodno odgavarujućim pravilima za različite setove vegetacijskih podataka niz ordinacionih metoda (CA, DCA, PCA i nMDS) a od klasifikcionih - UPGMA, kao hijerarhijski, aglomerativni metod. Da bi detektovali nivo florističkog ili ekološkog diskontinuiteta i njegovu statističku signifikantnost primenjena je ANOSIM analiza. Multivarijantnom SIMPER procedurom je dodatno kvantifikovan doprinos svakog pojedinačnog taksona ili faktora postojećem obrazcu ukupnog florističkog odnosno ekološkog diskontinuiteta između analiziranih setova vegetacijskih odnosno ekoloških podataka. Korespodentna analza (CA) i klasifikacioni UPGMA metod su pokazali da se u odnosu na recentno stanje florističkog sastava i sastojinske strukture nizijske šume plavnog i izvanplavnog područja Ravnog Srema diferenciraju na četiri velike grupe sastojina, koje u potpunosti korespondiraju sa cenoekološkim grupama tipova šuma: močvarne šume crne jove, šume bele vrbe i topola, šume lužnjaka i jove i šume lužmjaka i graba. Shodno multivarijantnoj ANOSIM analizi, utvrđeno je da najveći stepen florističkog diskontinuiteta postoji upravo između cenogrupe močvarne šume crne jove i cenogrupe lužnjaka i graba. Po osnovu SIMPER procedure najznačajnijim vrstama, koje doprinose (na ≈15% kumultativnog doprinisa) prethodno utvrđenom obrazcu florističkog diskontinuiteta sastojinske strukture, na nivou istraženih cenotipova, samtraju se sledećim redosledom: Amorpha fruticosa 2, Populus euroamericana cl. I -214 (1), Quercus robur 1, Amorpha fruticosa 3, Fraxinus angustifolia 1, Carpinus betulus 1 i Fraxinus angustifolia 3...As floodplains in Europe are very fragile ecosystems, increasingly threatened by anthropopression, there is a growing need for increase in number of forest stands of this type placed under a special protection regime. The most recent floristic and ecological studies presented in this dissertation provide a wider ecological foundation for protection of natural values of these forests, as well as for sustainable management of lowland forest ecosystems distributed in the floodplain and out-of-floodplain areas, both in Ravni Srem and in any other forest area belonging to the complex of alluvial hygrophilous forests. In order to detect and analyze the basic floristic differentiation of typologically separated units of forest vegetation, a number of ordination methods (CA, DCA, PCA and nMDS) and the classification method UPGMA (as a hierarchical agglomerative method) were applied according to the scientifically recognized rules for various sets of vegetation data. The ANOSIM method was used in order to detect the level of floristic or ecological discontinuity and its statistical significance. The multivariate SIMPER procedure was used for additional quantification of contribution of each individual taxon or factor to the existing pattern of overall floristic or ecological discontinuity between the analyzed sets of vegetation or ecological data. The correspondent analysis (CA) and classification UPGMA method have shown that,regarding the recent condition of floristic composition and stand structure, the lowland forests of floodplain and out-of-floodplain areas of Ravni Srem are differentiated into four large groups of stands, completely corresponding with the coenoecological groups of forest types: Swamp forest of Black Alder, forests of White Willow and Poplar, forests of Pedunculate Oak and Alderand forests of Pedunculate Oak and Hornbeam. The multivariate ANOSIM analysis has shown the greatest degree of floristic discontinuity between the coeno-group of Swamp forest of Black Alder and the coeno-group of Pedunculate Oak and Hornbeam. According to the SIMPER procedure, the most important species (contributing with ≈ 15% of cumulative contribution) to the previously determined pattern of floristic discontinuity of stand structure at the level of studied coeno-types, are in following order: Amorphafruticosa 2, Populuseuroamericana cl. I -214 (1), Quercus robur 1, Amorphafruticosa 3, Fraxinusangustifolia 1, Carpinus betulus 1 andFraxinusangustifolia 3..

Histological and morphometric aspects of ridge preservation with a moldable, in situ hardening bone graft substitute

Biphasic calcium phosphates (BCP) are widely used in alveolar ridge regeneration as a porous scaffold for new bone formation. The aim of this case series was to evaluate the regenerative effect of the combination of BCP and polylactide-co-glycolide (PLGA) which can serve as a barrier membrane during bone regeneration. The study included five patients. Four months into the healing period, bone samples were collected for histological and morphometric analyses. The results of morphometric analysis showed that newly formed bone represented 32.2 ± 6.8% of the tissue, 31.9 ± 8.9% was occupied by residual graft and 35.9 ± 13.5% by soft tissue. Active osteogenesis was seen around the particles of the graft. The particles were occupied mostly by immature woven bone and connective tissue. The quality and quantity of newly formed bone, after the use of BCP/PLGA for ridge preservation, can be adequate for successful implant therapy after tooth extraction.Projekat ministarstva br. OI 175021 i br. OI 17300

Transient finite element modeling of functional electrical stimulation

Transcutaneous functional electrical stimulation is commonly used for strengthening muscle. However, transient effects during stimulation are not yet well explored. The effect of an amplitude change of the stimulation can be described by static model, but there is no differency for different pulse duration. The aim of this study is to present the finite element (FE) model of a transient electrical stimulation on the forearm. Discrete FE equations were derived by using a standard Galerkin procedure. Different tissue conductive and dielectric properties are fitted using least square method and trial and error analysis from experimental measurement. This study showed that FE modeling of electrical stimulation can give the spatial-temporal distribution of applied current in the forearm. Three different cases were modeled with the same geometry but with different input of the current pulse, in order to fit the tissue properties by using transient FE analysis. All three cases were compared with experimental measurements of intramuscular voltage on one volunteer

Early impacts of marginal land-use transition to Miscanthus on soil quality and soil carbon storage across Europe

The authors acknowledged INA laboratories for performing soil chemical analysis, in particular Slijepčević Boris and Rukavina Slavica.Peer reviewe

Site impacts nutrient translocation efficiency in intraspecies and interspecies miscanthus hybrids on marginal lands

Miscanthus, a C4 perennial rhizomatous grass, is capable of growing in varied climates and soil types in Europe, including on marginal lands. It can produce high yields with low nutrient inputs when harvested after complete senescence. Senescence induction and rate depend on complex genetic, environmental, and management interactions. To explore these interactions, we analysed four miscanthus hybrids (two novel seed-based hybrids, GRC 3 [Miscanthus sinensis × sinensis] and GRC 14 [M. sacchariflorus × sinensis]; GRC 15, a novel M. sacchariflorus × sinensis clone; and GRC 9, a standard Miscanthus × giganteus clone) in Italy, Croatia, Germany and the UK. Over all trial locations and hybrids, the average aboveground biomass of the 3-year-old stands in August 2020 was 15 t DM ha−1 with nutrient contents of 7.6 mg N g−1 and 14.6 mg K g−1. As expected, delaying the harvest until spring reduced overall yield and nutrient contents (12 t DM ha−1, 3.3 mg N g−1, and 5.5 mg K g−1). At lower latitudes, the late-ripening M. sacchariflorus × sinensis GRC 14 and GRC 15 combined high yields with low nutrient contents. At the most elevated latitude location (UK), the early-ripening M. sinensis × sinensis combined high biomass yields with low nutrient offtakes. The clonal Miscanthus × giganteus with intermediate flowering and senescence attained similar low nutrient contents by spring harvest at all four locations. Seasonal changes in yield and nutrient levels analysed in this study provide: (1) a first step towards recommending hybrids for specific locations and end uses in Europe; (2) crucial data for determination of harvest time and practical steps in the valorization of biomass; and (3) key sustainability data for life cycle assessments. Identification of trade-offs resulting from genetic × environment × management interactions is critical for increasing sustainable biomass supply from miscanthus grown on marginal lands