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Search Results: 1 - 10 of 462898 matches for " Karaman Maja A. "
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Macroelements and heavy metals in some lignicolous and tericolous fungi
Karaman Maja A.,Matavulj Milan N.
Zbornik Matice Srpske za Prirodne Nauke , 2005, DOI: 10.2298/zmspn0508255k
Abstract: Considering the importance of Basidiomycotina fungi as bioindicators and the increasing tendency of air and soil contamination nowadays, content of macroelements: N, P, K, Ca, Mg and Na, and some of heavy metals (microelements): Fe, Pb, Cu, Cr, Zn in sporocarps of 22 species of macrofungi from National park Fru ka Gora was analyzed in this work. The majority of them are lignicolous species from the class: Homobasidiomycetes order Aphyllophorales s. lato and two of them belong to subdivision Ascomycotina. Special attention was given to the medically important fungal species widely distributed in this area: Ganoderma lucidum, Ganoderma applanatum, Coriolus. versicolor, Flammulina velutipes, Meripilus giganteus and Omphalotus olearius. Since fungi uptake macro- and microelements from the substrate, the soil and tree samples were also analyzed. The aim of this study was to determine the common concentration data of these elements in unpolluted area. According to the obtained results, fungi tended to accumulate K, P and N with lower variability recorded than that for Ca, Mg and Na due to essential importance of these elements in fungal metabolic processes, independently from ecological group affiliation and habitats. The analysing substrate (wood) contain higher concentration of Ca and Pb in relevance to fungi. As a result of transfer factors (TFs) that were estimated from the ratio of "concentration in fungi on dry weight basis" to "concentration in the tree or soil on dry weight basis" analyzed fungi tended to accumulate Cu and Zn, and partially Cr. Among the species that accumulate microelements the following species could be emphasized: Meripilus giganteus (except for Zn) Schizophyllum commune (except for Pb), Ganoderma applanatum (except for Fe and Zn). Superaccumulators of Fe were the lignicolous, medically imortant species M. giganteus, G. lucidum, Sch. commune, and tericolous ones: C. atramentari- us, F. velutipes, and P. vernalis. Good Cu accumalators were tericolous species: Psathyrella vernalis, Morchella vulgaris, and Coprinus atramentarius, then the species possesing the rhizomorphs: Armillaria polymyces and Omphalotus olearius, and finally lignicolous species: Ganoderma applanatum and Pseudotrametes gibbosa. The highest accumulation of Zn was recorded for the species Schizophyllum commune, while the fungal species expressed the smallest tendency of accumulation of Pb, except one tericolous saprophytic species C. atramentarius. The greatest accumulation of Cr was found in tericolous species especially C. atramentarius, too. Statistical cluster a
Preliminary checklist of Myxomycota and Ascomycota from Fru ka Gora mountain
Karaman Maja A.,Novakovi? Milana S.,Savi? Dragi?a,Matavulj Milan N.
Zbornik Matice Srpske za Prirodne Nauke , 2012, DOI: 10.2298/zmspn1223037k
Abstract: Fru ka Gora mountain represents very important source of natural and semi-natural forest ecosystems in the northern part of the Republic of Serbia and therefore it is important source of habitats for different groups of fungi. As opposed to coordinated inventory and monitoring projects of fungi established around Europe long ago, mycological researches in Serbia are still sporadic and insufficiently coordinated by authorities and experts. In accordance with that, available data concerning the state of fungi in Serbia are scarce. The aim of this work was to collect all relevant unpublished data considering fungi in Fru ka Gora and to present checklist of two fungal phyla: Myxomycota and Ascomycota. In the presented checklist, 23 recorded species of Myxomycota (known as fungal analogues) were distributed in 2 classes, 5 orders, and 7 families. The first class (Protosteliomycetes) contained only one species - Ceratiomyxa fruticulosa (fam. Ceratiomyxaceae). The largest order was Trichiales (9 species), while the dominant families were Stemonitidaceae and Trichiaceae, each with 6 species recorded. The most abundant species was Lycogala epidendrum (fam. Reticulariaceae), with 13 records. Phylum Ascomycota was represented with 95 species belonging to 6 classes, 12 orders and 29 families. The most highly represented classes were Leotiomycetes (32 species) and Pezizomycetes (31 species). The most abundant species were: Xylaria polymorpha (17 records), Xylaria hypoxylon (14 records), and Sarcoscypha coccinea (14 records). [Projekat Ministarstva nauke Republike Srbije, br. III-43002]
Conditionally pathogenic fungi in recreational waters
Matavulj Milan N.,Vuliki? Neboj?a,Gojkovi? Igor,Karaman Maja A.
Zbornik Matice Srpske za Prirodne Nauke , 2005, DOI: 10.2298/zmspn0519149m
Abstract: The improvement of health and life conditions depends on various environmental factors. The exposition to organic and inorganic pollutants, as well as to the broad spectar of microorganisms is one of these factors. Medically important fungi have been increasing their number recently especially in urban and in recreational zones. Some of them, first of all molds and yeasts, are involved by different means in causing more or less serious diseases of man and animals. Frequency of alergic symptoms and human mycotic lesions increased significantly during last decades. Such phenomena have provoked more scientific attention recently. According to the available literature data, micro-fungi, causing mycoses and "environmental" fungi too could be considered as an important factor of health risk, being neglected and underestimated so far, especially in analyses of safe use of recreational waters and surrounding areas, among them swimming pools, river and sea beaches. On the basis of such statement there arises conclusion that water and ground of recreational zones could serve as vectors in transmission pathways of potentially or conditionally pathogenic fungi, being dangerous especially for immunocompromised individuals, which suggests inclusion of qualitative and quantitative composition of fungal community into a continual monitoring of hygienic status of recreational zones.
Antimicrobial properties of ZnO nanoparticles incorporated in polyurethane varnish
Du?an Zveki?,Vladimir V. Srdi?,Maja A. Karaman,Milan N. Matavulj
Processing and Application of Ceramics , 2011,
Abstract: The antimicrobial effect of the ZnO nanoparticles dispersed in polyurethane varnishes was investigated. Antimicrobial activity was evaluated against three bacteria (Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa) and one strain fungi (Sacharomyces cerevisiae) by the “pour-plate” test. It was shown that the ZnO nanoparticles efficiently inhibit growth of the colonies of Staphylococcus aureus, Pseudomonas aeruginosa and Saccharomyces cerevisiae, but their activity against Escherichia coli was found to be questionable suggesting more detailed research.
Fungi in the legislation of the Republic of Serbia
Ivan?evi? Boris N.,Matavulj Milan N.,Vukojevi? Jelena B.,Karaman Maja A.
Zbornik Matice Srpske za Prirodne Nauke , 2012, DOI: 10.2298/zmspn1223051i
Abstract: Conservation and protection of fungi have lately been considered as extremely important elements of the environmental conservation, and numerous environmental, scientific, medical, economic, cultural, ethical, and other reasons for such attitude exist today. This paper presents an overview of official regulations on the protection of fungi in the Republic of Serbia from the Act of Protection of 1991 until today. The paper lists and analyses the good and bad provisions of individual legal regulations. It registers the effects of the adopted regulations on the actual efficiency of protection of endangered species of fungi (macrofungi, mushrooms), and considers the impact of chronological development of legislation on the population of fungi in nature, and presents general measures to improve protection of mushrooms in the future. These measures primarily include reliable information and study of fungi as a basis for their effective protection based on scientific knowledge. [Projekat Ministarstva nauke Republike Srbije, br. OI-179079]
Microbiological investigation of peppermint and pumpkin seed kernels drying in batch dryer
Matavulj Milan N.,Martinov Milan L.,Karaman Maja A.,Veselinov Branislav V.
Zbornik Matice Srpske za Prirodne Nauke , 2010, DOI: 10.2298/zmspn1019061m
Abstract: The goal of this research was to investigate improvement of drying method of peppermint and pumpkin kernels (hull-less pumpkin seed) with the aim to get as best microbiological quality of products as possible. Small and medium scale producers of medicinal plants in most cases perform it in batch dryers, which offer optimal output rate. Disadvantages of this dryer type are slower through-heating of upper layers, with the resulting increase of microbial count. In this paper, results of investigation of drying characteristics in batch dryer expressed through the changes of count of bacteria and microfungi are presented. The drying regime was applied in three different phases, and different material batch heights. Obtained results show that microbial count has increased in the upper layer during process of peppermint drying, while the temperature was less than 45°C for a long period. However, during the final drying phase in this layer, the temperature was also over 45°C, and the final microbial count was almost the same for upper and lower levels. During the treatment of pumpkin kernels in all of cases number of microorganisms indicated that the treated pumpkin grains belonged to the 3B qualitative group or to the 4B for phase drying respectively, and to the 4A for control group according to the Europaean Pharmacopoeia. The results obtained suggest that the treatment of hull-less pumpkin seed with even higher temperatures of drying agents, for example 70°C or 80°C, in the first phase should be investigated. After that phase, the second phase would follow, using temperature of 60°C, and the method with shifting mode should be applied.
Lignicolous macrofungi of the Barda a foodplain region
Matavulj Milan N.,Karaman Maja A.,Gojkovi? Igor,?ur?evi? Svjetlana
Zbornik Matice Srpske za Prirodne Nauke , 2005, DOI: 10.2298/zmspn0519161m
Abstract: In the frame of biodiversity investigation of the Barda a floodplain (Republic of Srpska, Bosnia), the investigation of the presence and the diversity of macrofungi of the wider Barda a region have been undertaken. The relative poor generic diversity of lignicolous macrofungi with only 21 species (11 families) representing this group has been recorded. Such a poor qualitative and also quantitative composition of this very important fungal group could be explained by heavy devastation of autochthonous plant communities, reducing them to the small number of plant associations of poor generic composition. Consequently, drastic decrease of the diversity of ecological niches as fungal habitats was caused. Even though being preliminary, our results point to the necessity of conservation and protection of recent fungal diversity but, in our opinion, not by making so-called "Red list of endangered species", which, due to the lack of information and very poor evidence on this group of organisms in the region under the consideration, are extremely unreliable and therefore disputable but rather through the very short list of few not endangered species conditionally called "White list of not endangered fungal species", if such species recently exist at all.
Lignicolous fungi as potential natural sources of antioxidants
Karaman Maja A.,Mimica-Duki? Neda M.,Matavulj Milan N.
Archives of Biological Sciences , 2005, DOI: 10.2298/abs0502093k
Abstract: As a result of an interest in natural derived metabolites around the world higher fungi (Basidiomycotina) have taken on great importance in biochemical investigations. A large number of structurally divergent compounds - both cellular components and secondary metabolites - have been extracted and found to possess significant biological activity, such as an immunomodulative effect on the human body. Effects of fungal biomolecules as potential natural antioxidants have not been examined so far. Biochemical analysis have included in vitro testing of the influence of different extracts (water methanol, chloroform) of selected fungal sporocarps on Fe2+/ascorbate-induced lipid peroxidation (LP) in a lecithin liposome system by TBA assay, as well as various other procedures. Qualitative analysis by TLC revealed a distinction both between different extracts of the same fungal species and between similar extracts of different species. The results obtained on antioxidative activities (LP inhibition and "scavenging" activity) indicate that MeOH extracts manifested a degree of activity higher than that of CHCl3 extracts with respect to antioxidative activity, the extracts can be ranged in the following declining order: Ganoderma lucidum, Ganoderma applanatum Meripilus giganteus, and Flammulina velutipes. The obtained results suggest that the analyzed fungi are of potential interest as sources of strong natural antioxidants in the food and cosmetics industries, whereas synthetic ones have proved to be carcinogenic.
Biological activities of the lignicolous fungus Meripilus giganteus (Pers.: Pers.) Karst.
Karaman Maja,Kai?arevi? Sonja,Somborski Jelena,Kebert M.
Archives of Biological Sciences , 2009, DOI: 10.2298/abs0904853k
Abstract: Crude extracts (methanolic-ME andwater-WE) of the fungus Meripilus giganteus (Pers.: Pers.) Karst. were analyzed for their antioxidative, antibacterial, cytotoxic, neurotoxic, and hemolytic activities using tests in vitro. The highest scavenging activity was exhibited by WE on OH radicals, showing a 50% effective concentration (EC50) at 292.83±2.5 μg/ml and ferric-reducing ability at 14.24±2.9 mg eq of ascorbic acid per g of dried extract (mg/g).An anti-bacterial effect was detected mostly against Gram-positive strains of bacteria. Toxicity assays exhibited higher effects for ME, reaching EC50=403.43±5.8 μg/ml against estrogen-dependent breast cancer cell lines (MCF-7); 50% hemolytic activity at a concentration of 30±0.03 μg/ml against erythrocytes; andEC50=4.5±0.05 mg/ml for acetyl cholinesterase-inhibitory activity. These results suggest possible use of this fungus as a new source of pharmaceuticals.
Variation of vascular ring as a cause of extubation failure
Signa Vitae , 2008,
Abstract: We report on an unexpected extubation failure in a two year old boy. In our patient, failure of extubation led to a diagnostic examination. The result of our examination was discovery of a congenital anomaly of the aortic arch and great vessels (vascular ring) with compression of the trachea. The presence of this anomaly in this patient was unknown to us before. A successful surgical procedure eliminated the underlying cause of the persistent extubation failures.
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