35 research outputs found
Macrophytes of the GrliĆĄte reservoir (Serbia): Fifteen years after its establishment
A large number of macrophytes, often in dense populations, have developed on the GrliĆĄte Reservoir, Serbia over a period of 15 years. Fast development of vegetation is a consequence of anthropogenic impact in lake management. The methodology used in this research covered 100% of the water body, including all areas with or without aquatic plants. The results indicate that plant communities are still in the early phase of development. This leaves space for future development of competitor macrophyte species (Najas marina, Eleocharis palustris, Typha latifolia, Typha angustifolia, Phragmites australis, etc.) capable of endangering stability of the lake, which will tend toward eutrophication
Nondestructive Method for Mapping Metal Contact Diffusion in In2O3 Thin-Film Transistors
The channel width-to-length ratio is an important transistor parameter for integrated circuit design. Contact diffusion into the channel during fabrication or operation alters the channel width and this important parameter. A novel methodology combining atomic force microscopy and scanning Kelvin probe microscopy (SKPM) with self-consistent modeling is developed for the nondestructive detection of contact diffusion on active devices. Scans of the surface potential are modeled using physically based Technology Computer Aided Design (TCAD) simulations when the transistor terminals are grounded and under biased conditions. The simulations also incorporate the tip geometry to investigate its effect on the measurements due to electrostatic tipâsample interactions. The method is particularly useful for semiconductorâ and metalâsemiconductor interfaces where the potential contrast resulting from dopant diffusion is below that usually detectable with scanning probe microscopy
Rasprostranjenje vrsta roda Lathyrus L. 1753 (Fabales, Fabaceae) u Vojvodini
Most of the Lathyrus species of the Vojvodina Province arc cultivated for fodder. They are protein-containing herbs which easily recover after grazing. Some perennial species survive in grassland communities for ten years or more. Certain species are important melliferous plants. In the Vojvodina Province, they inhabit different habitats like forests and grasslands, dry and wet sites, thus showing a wide distribution range. Besides their floristic and vegetation aspects, their role as green and dry fodder crops should be emphasized.U radu je dato rasprostranjenje vrste roda Lathyrus u Vojvodini, na UTM kartama sa UTM kodovima i konkretnim lokalitetima. Podaci potiÄu iz literature koja obuhvata vremenski period od oko 140 godina, Herbarijuma Departmana za biologiju i ekologiju (BUNS) i sopstvenih terenskih istraĆŸivanja. Daje se njihov florni element, odnosno areal rasprostranjenja tipovi zemljiĆĄta i staniĆĄta na kojima rastu, njihov privredni znaÄaj i broj hromozoma. S obzirom da su divlji graĆĄkovi znaÄajne krmne biljke, mogle bi biti ukljuÄene u gajene ili koriĆĄÄene u selekciji i oplemenjivanju. U flori Vojvodine raste 16 vrsta roda Lathyrus od kojih 11 njih ima privredni znaÄaj a joĆĄ dve bi mogle biti korĆĄiÄene kao krma. U toku je njihovo anatomsko ispitivanje, ĆĄto Äe ukazati na nivo ekoloĆĄke adaptacije i upotrebljivosti u ishrani stoke. TakoÄe je u toku fizioloĆĄka analiza vrsta, analiza makroelemenata, koncentracija pigmenata i intenzitet disanja i fotosinteze od Äega zavisi produkcija organske biljne mase
Comparison of the morphological parameters of the face in a population with a full dental arch
Introduction: The analysis of facial parameters in young people with a full dental arch is an assessment of the representation of certain anthropological features in the Serbian geographical area, but also a starting point for their reconstruction after tooth loss in order to achieve the maximum therapeutic and aesthetic effect. Aim: The aim of the work was to measure and compare facial parameters among respondents with a complete dental arch. Material and methods: 91 dental students participated in the research, 32 (35.2%) male and 59 (64.8%) female. The average age of the respondents was 22.16±1.53 years. The length and width of the face were measured, as well as the vertical and horizontal parameters, and the facial index was calculated. Results: Men had a significantly longer (Z=4.567; p<0.001) and wider face (Z=5.962; p<0.001) compared to women. There was no significant difference in the face index between women and men (ch 2 =2.492; p=0.666). There was also no significant difference in the vertical analysis of the face according to gender (ch 2 =0.065; p=0.798). In the majority of subjects, the shorter middle third of the face was measured. In the case of the expected division of the lower third of the face, it exists in a significantly greater extent in males (ch 2 =5.989; p=0.014). In the majority of subjects, the intercanthal width corresponded to the width of the eye, in both sexes, without statistical significance. Further, in a significantly larger number of male and female respondents, it was determined that the bipupillary corresponds to the intercommissural distance. The interalar distance corresponding to the width of the eye was more significantly present in women (ch 2 =5.002; p=0.025). Conclusion: Measurement of facial parameters can significantly improve dental therapy by enabling optimal aesthetic performance
Anthropometric parameters and aesthetics in the making of fixed prosthodontic restaurations: Part 2
Introduction: The role of aesthetic dentistry in the field of fixed dental prosthetics is to redesign the smile, which means not only the treatment on the teeth, but also the treatment of the surrounding soft tissues. Successful therapy can be achieved by establishing the harmony between the static (teeth, gingiva) and dynamic factors (lips, cheeks, mimic muscles) at rest and when performing various functions of the orofacial system. The aim: of the study was to analyze the parameters of the oral soft tissues (gingival health, gingival height, gingival zeniths, lip line and symmetry and balance of the dentition) that affect the aesthetics of fixed prosthodontic restorations. Literature data and clinical experience were used. Conclusion: Adherence to the described parameters is of great importance in the development of aesthetic and functional fixed prosthetic restoration
Angiotensin converting enzyme DD genotype is associated with acute coronary syndrome severity and sudden cardiac death in Taiwan: a case-control emergency room study
TRY plant trait database â enhanced coverage and open access
Plant traitsâthe morphological, anatomical, physiological, biochemical and phenological characteristics of plantsâdetermine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research spanning from evolutionary biology, community and functional ecology, to biodiversity conservation, ecosystem and landscape management, restoration, biogeography and earth system modelling. Since its foundation in 2007, the TRY database of plant traits has grown continuously. It now provides unprecedented data coverage under an open access data policy and is the main plant trait database used by the research community worldwide. Increasingly, the TRY database also supports new frontiers of traitâbased plant research, including the identification of data gaps and the subsequent mobilization or measurement of new data. To support this development, in this article we evaluate the extent of the trait data compiled in TRY and analyse emerging patterns of data coverage and representativeness. Best species coverage is achieved for categorical traitsâalmost complete coverage for âplant growth formâ. However, most traits relevant for ecology and vegetation modelling are characterized by continuous intraspecific variation and traitâenvironmental relationships. These traits have to be measured on individual plants in their respective environment. Despite unprecedented data coverage, we observe a humbling lack of completeness and representativeness of these continuous traits in many aspects. We, therefore, conclude that reducing data gaps and biases in the TRY database remains a key challenge and requires a coordinated approach to data mobilization and trait measurements. This can only be achieved in collaboration with other initiatives
TRY plant trait database â enhanced coverage and open access
Plant traits - the morphological, anatomical, physiological, biochemical and phenological characteristics of plants - determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research spanning from evolutionary biology, community and functional ecology, to biodiversity conservation, ecosystem and landscape management, restoration, biogeography and earth system modelling. Since its foundation in 2007, the TRY database of plant traits has grown continuously. It now provides unprecedented data coverage under an open access data policy and is the main plant trait database used by the research community worldwide. Increasingly, the TRY database also supports new frontiers of traitâbased plant research, including the identification of data gaps and the subsequent mobilization or measurement of new data. To support this development, in this article we evaluate the extent of the trait data compiled in TRY and analyse emerging patterns of data coverage and representativeness. Best species coverage is achieved for categorical traits - almost complete coverage for âplant growth formâ. However, most traits relevant for ecology and vegetation modelling are characterized by continuous intraspecific variation and traitâenvironmental relationships. These traits have to be measured on individual plants in their respective environment. Despite unprecedented data coverage, we observe a humbling lack of completeness and representativeness of these continuous traits in many aspects. We, therefore, conclude that reducing data gaps and biases in the TRY database remains a key challenge and requires a coordinated approach to data mobilization and trait measurements. This can only be achieved in collaboration with other initiatives
Analysis of forest vegetation in Koviljski Rit: Comparison of habitats with varying degrees of anthropogenic influence
Koviljski Rit is located along the left bank of the Danube River, between the
villages of Kovilj and Gardinovci. It is a rare example of pristine nature,
where the original features of a swamp biotope are preserved. Because of its
exceptional natural value, Koviljski Rit, along with the swamp in
Petrovaradin, has been under the protection of the Republic of Serbia since
1998, when it was proclaimed a Special Nature Reserve of the first category.
Natural vegetation found in Koviljski Rit includes woodlands composed of
willow and poplar. The majority of the reserve consists of forest plantations
(55.6%), which include habitats influenced by human activities. Based on DCA
(Detrended correspondence analysis) of forest vegetation in Koviljski Rit,
there is a high degree of similarity between natural populations of white
willow and stands of anthropogenic origin. However, in contrast, the same
analysis indicates clear differences between natural and artificial poplar
stands. Moreover, depending on whether they were planted in temporary or
permanent flood plain habitats, significant differences are evident in the
floristic structures of Euro-American poplar forests. Ecological conditions
in habitats of white and Euro-American poplar (Populus x euroamericana/Dode/
Guinier) communities were found to be more similar with respect to
illumination and soil humidity. However, more importantly, the anthropogenic
forests recorded the lowest diversity as a result of regular thinning and
measures implemented through forest management. [Project of the Serbian
Ministry of Education, Science and Technological Development, Grant no. III
43002: Biosensing technologies and global system for continuous research and
integrated management of ecosystems and Grant, no. 31,041th: Forest
plantations as a way to increase reforestation in Serbia