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    Wyświetlanie 1-14 z 14
    Tytuł:
    Ant Faunal Diversity of Bibhutibhushan Wildlife Sanctuary, North 24 Parganas, West Bengal, India
    Autorzy:
    Saha, Sumana
    Roy, Tamoghna
    Raychaudhuri, Dinendra
    Powiązania:
    https://bibliotekanauki.pl/articles/1065086.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Ant Fauna
    Bibhutibhusan Wildlife Sanctuary
    Functional groups
    New Record
    Opis:
    The present study unfolds the diversity of ants of Bibhutibhushan Wildlife Sanctuary, North 24 Parganas, West Bengal, India. A total of 22 species under 13 genera distributed over 5 subfamilies could be recorded. These include three newly recorded species namely Leisiota frauenfeldi (Mayr) (Formicinae), Crematogaster (Acrocoelia) hodgsoni Forel (Myrmicinae) and Brachyponera nigrita Emery (Ponerinae) from the state and nearly 90.5% of the reported species are new for the district (marked*). Analysis of their zoogeographical distribution reveals that the fauna apart from being Oriental also includes some Palaearctic (72.73%), Australian (13.63%) and Ethiopian (4.54%) elements. The dominant functional group is constituted by the Subordinate Camponotini (36.37%) followed by Generalized Myrmicinae (22.73%), Tropical Climate Specialist (13.63%), Specialist Predator (9.09%), Opportunist (9.09%) and Dominant Dolichorinae (9.09%). Ants are mostly prevalent during Monsoon (81.82%), followed by Postmonsoon (68.18%) and Premonsoon (50.00%). Two species namely Camponotus (Tanaemyrmex) compressus (Fabricius) and Oecophylla smaragdina (Fabricius) are recorded throughout the year. Ranking sequence of the most abundant species in descending order is: Camponotus (Tanaemyrmex) compressus (15.01%) = Oecophylla smaragdina (15.01%) > Crematogaster (Acrocoelia) hodgsoni (12.91%). Camponotus (Tanaemyrmex) compressus and Oecophylla smaragdina are the most dominant species. Data also reveals that both core and buffer zones conjointly offer a better combination of habitat requirement, as 12 species are common in both the zones. Highest no. of species are recorded from leaf litter and ground combined together (22 species) and 6 species are arboreal in nature. Shannon’s Diversity Index (α diversity) and Simpson’s Diversity Index both are higher in buffer zone. This reflects the habitat exploitation efficiency of the encountered species. As per Jaccard Index (β diversity) the similarity value of both the zones is only 0.55.
    Źródło:
    World Scientific News; 2019, 120, 2; 81-110
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phytochemical, FTIR and Elemental Studies of African Mistlotoe (Viscun album) Leaves on Cola nitida from South-Eastern Nigeria
    Autorzy:
    Chizoruo, Ibe Francis
    Onyekachi, Ibe Bridget
    Odinaka, Nzenwa Peter
    Chinyelu, Enedoh Margaret
    Powiązania:
    https://bibliotekanauki.pl/articles/1065401.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Cola nitida
    Functional groups
    Phytochemicals
    Viscum album
    elemental content
    Opis:
    In the recent time there is an increase in the use of medicinal plants for treatment of ailments. This is owning to availability and low cost of herbal materials, which has increased the use of plants such as Viscum album for medicinal purposes. These plants may contain mineral elements, important phytochemicals and functional groups for healthy leaving, but increased use of this plant could lead to magnification of the mineral elements. Therefore, leaves of mistletoe (Viscum album) harvested from kola nut tree (Cola nitida) in Imo state, South Eastern Nigeria was studied. The study was aimed at determining the elemental content, phytochemicals as well as Fourier Transform Infra-red (FTIR) analysis of petroleum ether and chloroform extract of Viscum album harvested from Cola nitida. The sample for elemental analysis was digested with mixture of concentrated nitric acid (HNO3) and perchloric acid (HClO4). Petroleum ether and chloroform were used as solvents to extract the sample used for phytochemical and FTIR analysis. Elemental content analysis indicates that Ca, Cr, Cu, Fe, Mg, Mn and Zn were present at varying concentrations. The elemental content is in the order Fe > Mn > Cu > Mg >Zn > Cr > Ca. The presence of flavonoids, alkaloids, phenols, saponins and tannins were confirmed by the phytochemical screening. FTIR analysis indicates that alcohols, amides, aromatics and carbonyl compounds are present in the chloroform and petroleum ether extract of Viscum album harvested from cola nitida, though at different intensities. The presence of some essential minerals as well as some phytochemicals and some important functional groups must have necessitated the use of this plant for medicinal purposes.
    Źródło:
    World Scientific News; 2019, 132; 84-97
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Ant Faunal Diversity of Chintamoni Kar Bird Sanctuary, West Bengal, India
    Autorzy:
    Bhattacharjee, Samrat
    Powiązania:
    https://bibliotekanauki.pl/articles/1193615.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Ant Diversity
    Chintamoni Kar Bird Sanctuary
    Functional Groups
    Premonsoon
    Opis:
    Ants are by far the most successful eusocial group of organisms. Present paper deals with ant survey in Chintamoni Kar Bird Sanctuary also called Narendrapur Bird Sanctuary, West Bengal, India. A total of 36 species under 18 genera and 6 subfamilies are recorded from the survey. Area A1 records maximum (27) species whereas area A7 records least (08) species. Premonsoon period of the year shows maximum ant activities and Subordinate Camponotini seems to be the predominant Functional group in the forest.
    Źródło:
    World Scientific News; 2017, 71; 28-42
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Impacts of Crustacean Zooplankton on a Natural Ciliate Community: a Short-term Incubation Experiment
    Autorzy:
    Li, Jing
    Yang, Kun
    Chen, Feizhou
    Lu, Wenxuan
    Fang, Ting
    Zhao, Xiuxia
    Li, Haiyang
    Cui, Kai
    Powiązania:
    https://bibliotekanauki.pl/articles/52401895.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    ciliates
    small-bodied cladocerans
    pseudodiaptomid copepods
    suppression impacts
    functional groups
    Opis:
    Direct and indirect effects of crustacean zooplankton (cladocerans and copepods) are important regulators of ciliate communities, especially in eutrophic systems. However, it is not clear whether pseudodiaptomids (e.g., Schmackeria), one of the dominant calanoid copepods in Chinese lakes, effectively impacts natural ciliate communities. The impacts of small-bodied cladocerans (e.g., Bosmina) on ciliates are also controversial. We performed an incubation experiment using winter lake water from Lake Chaohu to assess the structuring effects that crustacean zooplankton have on natural ciliate populations. The presence and absence of cladocerans (Bosmina sp.) and copepods (Schmackeria inopinus) were alternated in four treatments. Both Bosmina sp. and Schmackeria inopinus had substantial impacts on ciliate abundance, biomass, and community structure. The response of ciliates was different in the presence of Bosmina sp. compared with Schmackeria inopinus and varied among categories such as the ciliate population, relative body size and functional feeding group. Our results also highlight the importance of interference and exploitative competition among metazooplankton groups.
    Źródło:
    Acta Protozoologica; 2017, 56, 4; 289-301
    0065-1583
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and dynamics of water adsorbed on the lignite surface: Molecular dynamics simulation
    Autorzy:
    You, Xiaofang
    He, Meng
    Cao, Xiaoqiang
    Lyu, Xianjun
    Li, Lin
    Powiązania:
    https://bibliotekanauki.pl/articles/109688.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    low rank coal
    water molecule
    oxygen-containing functional groups
    molecular dynamics
    Opis:
    The effects of oxygen-containing functional groups on the structure and dynamic properties of water molecules near a lignite surface were investigated through molecular dynamics (MD) simulations. Because of its complex composition and structure, a graphite surface containing hydroxyl, carboxyl, and carbonyl groups was used to represent the lignite surface model. According to X-ray photoelectron spectroscopic (XPS) results, the composing proportion of hydroxyl, carbonyl and carboxyl is 21:13:6. The density profiles of oxygen and hydrogen atoms indicate that the brown coal surface characteristics influence the structural and dynamic properties of water molecules. The interfacial water is much more ordered than bulk water. The results of the radial distribution functions, mean square displacements, and local self-diffusion coefficients for the water molecules in the vicinity of three oxygen-containing functional groups confirmed that carboxyl groups are the preferential adsorption sites.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 1; 10-20
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancing low-rank coal flotation using a mixture of dodecane and n-valeraldehyde as a collector
    Autorzy:
    Liu, Zechen
    Liao, Yinfei
    An, Maoyan
    Lai, Qingteng
    Ma, Longfei
    Qiu, Yuliang
    Powiązania:
    https://bibliotekanauki.pl/articles/109432.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    mixed collector
    oxygen-containing functional groups
    adsorption mechanism
    low rank coal
    flotation
    Opis:
    Low-rank coals are difficult to float using common hydrocarbon oily collectors, such as dodecane and diesel. In this investigation, a mixture of dodecane and n-valeraldehyde was used as a collector to enhance low-rank coal flotation. The changes of the contact angle and surface functional groups of low-rank coal were measured before and after different collectors’ adsorption to indicate its absorption mechanism. Surface tension of different collectors was also measured to identify its spreading performance. The results showed that the flotation performance using the mixture as a collector was much better than that using dodecane or n-valeraldehyde solely. When used the mixture of dodecane and n-valeraldehyde as collector, dodecane primarily covers the hydrophobic sites while n-valeraldehyde primarily covered the hydrophilic sites by hydrogen bond promoting adsorption of dodecane at these sites. There existed synergistic effect between dodecane and n-valeraldehyde. Additionally, n-valeraldehyde can reduce the surface tensions to improve the spreading performance of mixed collector on low-rank coal surface. The improvement both in adsorption and spreading was responsible for the enhancement of low-rank coal flotation by using the mixture.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 1; 49-57
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zinc ion adsorption on carbon nanotubes in an aqueous solution
    Autorzy:
    Ansari, A.
    Mehrabian, M. A.
    Hashemipour, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/779155.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    adsorption
    molecular dynamics simulation
    heavy metals
    electrostatic force
    interaction energy
    functional groups
    Opis:
    The literature devoted to numerical investigation of adsorption of heavy metal ions on carbon nanotubes is scarce. In this paper molecular dynamics is used to simulate the adsorption process and to investigate the effect of the infl uencing parameters on the rate of adsorption. The predictions of the molecular dynamics simulation show that the adsorption process is improved with increasing the temperature, pH of solution, the mass of nanotubes, and surface modifi cation of CNT using hydroxyl and carboxyl functional groups. The results predicted by the model are compared with the experimental results available in the literature; the close agreement validates the accuracy of the predictions. This study reveals that the water layers around the carbon nanotubes and the interaction energies play important roles in the adsorption process. The study also shows that electrostatic force controls the attraction of zinc ions on the nanotube sidewall.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 3; 29-37
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent Advances in Application of Transcriptomics: Research on Heterotrophic and Autotrophic Protists
    Autorzy:
    Anderson, O. Roger
    Powiązania:
    https://bibliotekanauki.pl/articles/52001052.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    Algae
    autotrophy
    ecology
    ecosystems
    functional groups
    genomics
    heterotrophic protists
    metabolism
    parasitism
    physiology
    Opis:
    The application of molecular phylogenetics to research on protists has substantially transformed our understanding of their evolution and systematics. More recently, advances in molecular technology, including high throughput sequencing, has opened new avenues for genomic analyses that elucidate major aspects of protistan biology across all levels of biological organization from cellular to ecosystems. This is a review of recent advances (particularly in the last two decades) of transcriptomic research on heterotrophic and autotrophic protists within three major topics: (i) Physiology and metabolism, (ii) Development and life cycles, and (iii) Environmental and ecological studies. Emphasis is placed on selection of representative research that highlights findings across diverse taxonomic groups within each of the three topics. Examples are drawn from parasitic as well as free-living taxa to provide a broad overview of some of the research strategies, and major findings, that have emerged from application of transcriptomics and related techniques in advancing our understanding of protistan biology.
    Źródło:
    Acta Protozoologica; 2022, 61; 47-75
    0065-1583
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Textural, surface, thermal and sorption properties of the functionalized activated carbons and carbon nanotubes
    Autorzy:
    Nowicki, P.
    Szymanowski, W.
    Pietrzak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/779561.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    carbonaceous adsorbents
    oxidation
    nitrogenation
    surface functional groups
    thermogravimetric study
    adsorption from liquid phase
    Opis:
    Two series of functionalised carbonaceous adsorbents were prepared by means of oxidation and nitrogenation of commercially available activated carbon and multi-walled carbon nanotubes. The effect of nitrogen and oxygen incorporation on the textural, surface, thermal and sorption properties of the adsorbents prepared was tested. The materials were characterized by elemental analysis, low-temperature nitrogen sorption, thermogravimetric study and determination of the surface oxygen groups content. Sorptive properties of the materials obtained were characterized by the adsorption of methylene and alkali blue 6B as well as copper(II) ions. The final products were nitrogen- and oxygen-enriched mesoporous adsorbents of medium-developed surface area, showing highly diverse N and O-heteroatom contents and acidic-basic character of the surface. The results obtained in our study have proved that through a suitable choice of the modification procedure of commercial adsorbents it is possible to produce materials with high sorption capacity towards organic dyes as well as copper(II) ions.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 4; 120-127
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the oxygen-containing functional group on the adsorption of hydrocarbon oily collectors on coal surfaces
    Autorzy:
    Wan, He
    Hu, Xianglin
    Luukkanen, Saija
    Qu, Juanping
    Zhang, Chonghui
    Xue, Jiwei
    Li, Hui
    Yang, Wei
    Yang, Shenghong
    Bu, Xianzhong
    Powiązania:
    https://bibliotekanauki.pl/articles/2146920.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    oxygen-containing functional groups
    hydrocarbon oily collectors
    molecular dynamics simulation
    coal surfaces
    adsorption
    Opis:
    The oxygen-containing functional groups (OCFG) on the coal surface affect the adsorption effect of hydrocarbon oily collectors (HOC). An investigation of the interaction between the HOC and OCFG in the absence and presence of water is conducive to understanding the effect of OCFG type on the adsorption of HOC on the coal surface. In this paper, FTIR analysis was used to analyze the OCFG type of coal surface. The adsorption behavior of HOC on different OCFG surfaces was investigated using molecular dynamics simulation. The results indicated the presence of OCFG such as -OH, -COOH, -C=O, and -COCH3 on the coal surface. In conditions without water, the effect of OCFG on HOC adsorption capability follows the order -COOH > -C=O > -OH > -COCH3. In an aqueous solution, the effect of OCFG on HOC adsorption capability follows the order -C=O>-COCH3>-OH>-COOH. Moreover, the hydrophilicity of OCFG is the key factor that affects the adsorption effect of HOC. In other words, the adsorption effect of HOC on the coal surface in an aqueous solution does not depend on the strength of the interaction between the OCFG and HOC in the absence of water, but on the hydrophilicity of the OCFG. The -COOH and -OH on the coal surface are not conducive to the adsorption of HOC onto the coal surface. Masking the -COOH and -OH of the coal surface is beneficial in improving the coal flotation performance with HOC as a collector.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 149937
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functional traits and plasticity of plants in ecological research and education
    Cechy funkcjonalne i plastyczne roślin w badaniach ekologicznych i edukacji
    Autorzy:
    Masarovičová, E.
    Májeková, M.
    Vykouková, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/106362.pdf
    Data publikacji:
    2015
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    adaptation
    functional ecology
    functional groups
    plant communities
    phenotypic plasticity
    vegetation
    adaptacja
    ekologia funkcjonalna
    grupy funkcyjne
    zbiorowiska roślinne
    plastyczność fenotypowa
    roślinność
    Opis:
    Plant functional traits are any morphological, physiological and phenological features, which indirectly affect plant fitness through their three basic components of plant individual performance - growth, reproduction and survival. These features represent also a keystone for plant functional groups, which are similar in three aspects - function on the level of organism, response to environmental factors and effect on ecosystems. Functional approach in ecology and vegetation study enables to evaluate plant communities on the base of species function in a community, and to relate functional structure of plant communities to particular environmental gradients. Species plasticity has many aspects that mirror species adaptations to the environmental conditions and which then also translate into functional structuring of plant communities. This approach is thus a novel and exciting mode how to carry on plant ecology, both in research and education at universities.
    Charakterystyczna funkcjonalność roślin zależy od ich cech morfologicznych, fizjologicznych i fenologicznych, które pośrednio wpływają na kondycję roślin poprzez trzy podstawowe elementy ich indywidualnego rozwoju, tj. wzrost, reprodukcję i przetrwanie. Cechy te stanowią również podstawę funkcyjnych grup roślinnych, które są podobne w trzech aspektach - funkcje na poziomie organizmu, odpowiedź na czynniki środowiskowe i wpływ na ekosystemy. Podejście funkcjonalne w ekologii i w badaniach roślin umożliwia ocenę zbiorowisk roślinnych w oparciu o funkcje gatunków w społeczności i odniesienie funkcjonalnej struktury zbiorowisk roślinnych do poszczególnych gradientów środowiskowych. Plastyczność gatunków ma wiele aspektów, które odzwierciedlają ich przystosowanie do warunków środowiskowych, a które następnie przekłada się także na funkcjonalną strukturę zbiorowisk roślinnych. Takie podejście jest więc nowym i interesującym sposobem rozumienia ekologii roślin, znajdującym zastosowania zarówno w badaniach, jak i w edukacji uniwersyteckiej.
    Źródło:
    Chemistry-Didactics-Ecology-Metrology; 2015, 20, 1-2; 59-65
    2084-4506
    Pojawia się w:
    Chemistry-Didactics-Ecology-Metrology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The process of increasing the functionality of poly(glycidyl azide) GAP
    Proces zwiększenia funkcyjności poli(azydku glicydylu) (GAP)
    Autorzy:
    Chmielarek, Michał
    Nowosielska, Julia
    Powiązania:
    https://bibliotekanauki.pl/articles/27787769.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    GAP
    poly(glycidyl azide)
    PECH
    polyepichlorohydrin
    epoxidation
    modification
    functional groups
    hydroxyl groups
    poli(azydek glicydylu)
    poliepichlorohydryna
    epoksydacja
    modyfikacja
    grupy funkcyjne
    grupy hydroksylowe
    Opis:
    Poly(glycidyl azide) (GAP) is a synthetic polymer with energetic properties due to the presence of an azide group in its structure. It is used in industry primarily as a component of binders for rocket fuel. Classically produced GAP has secondary hydroxyl groups, which react much more slowly with the crosslinking agents diisocyanates found in high-energy materials. It has been confirmed that methods can be used which modify the structure of GAP thereby obtaining a polymer with an increased number of functional groups. Furthermore, such processes produce a polymer with more desirable primary hydroxyl groups. Using such a polymer is economically advantageous and allows easier control of processes using GAP. Attempts were made to obtain such a modified polymer. The polymers obtained were subjected to FTIR analysis, viscosity measurements and hydroxyl group values.
    Poli(azydek glicydylu) to syntetyczny polimer o właściwościach energetycznych, które zawdzięcza posiadaniu w swojej strukturze grupy azydkowej. Znajduje zastosowanie w przemyśle przede wszystkim jako składnik lepiszczy do paliw rakietowych. Klasycznie wytwarzany GAP posiada drugorzędowe grupy hydroksylowe dużo wolniej reagujące z występującymi w materiałach wysokoenergetycznych czynnikami sieciującymi – diizocyjanianami. Potwierdzono możliwość zastosowania metod, które pozwalają zmodyfikować strukturę GAP i uzyskać polimer ze zwiększoną ilością grup funkcyjnych. Ponadto w procesie tym wytwarzany jest polimer o bardziej pożądanych pierwszorzędowych grupach hydroksylowych. Używanie takiego polimeru jest korzystne ekonomicznie i pozwala na łatwiejszą kontrolę procesów z użyciem GAP. Podjęto próby otrzymania tak zmodyfikowanego polimeru. Otrzymane polimery poddano analizie FTIR, pomiaru lepkości i wartości grupy hydroksylowej.
    Źródło:
    Materiały Wysokoenergetyczne; 2022, 14; 93--106
    2083-0165
    Pojawia się w:
    Materiały Wysokoenergetyczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ oddziaływań brzegowych na roślinność polan leśnych w Sudetach Środkowych
    Influence of the edge effect on the vegetation of forest glades in the Middle Sudety Mts. (SW Poland)
    Autorzy:
    Pruchniewicz, D.
    Żołnierz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/989965.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    gory
    Sudety Srodkowe
    Gory Sowie
    Gory Bardzkie
    Wzgorza Wlodzickie
    Wzgorza Wyrebinskie
    polany srodlesne
    oddzialywania brzegowe
    roslinnosc lakowa
    sklad gatunkowy
    roznorodnosc gatunkowa
    forest glades
    edge effect
    species composition
    functional groups
    species diversity
    Opis:
    The influence of the edge effect on the meadow vegetation pattern was studied in the forest glades in the central part of the Middle Sudety Mts. (SW Poland). The spectacular edge effect is seen in the range of 4 m from the forest border towards the center of the glades. Within that belt we observed decrease in tree and bush species number, increase in share of graminoids and Fabaceae species, as well as increase in share of species generally related to grassland communities. A significant increase in species number and values of Shannon−Wiener diversity index was noticed within the distance of eight meters from the edges of glades.
    Źródło:
    Sylwan; 2014, 158, 07; 524-530
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Density Functional Theory Study Of The Interaction Of Hydroxyl Groups With Iron Surface
    Badanie wzajemnego oddziaływania grup hydroksylowych na powierzchni żelaza za pomocą teorii funkcjonału gęstości
    Autorzy:
    Nunomura, N.
    Sunada, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/355298.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    density functional theory
    hydroxyl groups
    iron surface
    adsorption energy
    teoria funkcjonału gęstości
    grupy hydroksylowe
    powierzchnia żelaza
    energia adsorpcji
    Opis:
    The electronic interaction of hydroxyl groups with Fe(100) surface is modelled using a density functional theory (DFT) approach. The adsorption energies and structures of possible adsorption sites are calculated. According to our calculations of the adsorption energies, the interaction between oxygen atom of OH species and surface iron atom is shown to be strong. It is likely to be due to the interaction of the lone-pair electrons of oxygen and the 3d orbital electrons of iron atom. At low coverage (0.25ML), the most favorable adsorption sites are found to be two-fold bridge sites, and the orientation of the O-H bond is tilted to the surface normal. Further, the adsorption energy is found to be decreasing with the increasing OH group coverage.
    Wzajemne oddziaływanie elektronowe grup hydroksylowych na powierzchni Fe(100) modelowano stosując metodę teorii funkcjonału gęstości (ang. density functional theory; DFT). Dokonano obliczeń energii adsorpcji oraz struktury potencjalnych centrów adsorpcji. Na podstawie otrzymanych wyników stwierdzono, że pomiędzy atomem tlenu grupy OH, a powierzchnią atomu żelaza występuje silne oddziaływanie. Jest to prawdopodobnie spowodowane oddziaływaniem wolnej pary elektronowej tlenu z elektronami atomu żelaza na orbitalach 3d. Przy niskim poziomie pokrycia (0,25 ML), najbardziej uprzywilejowane centra aktywne stanowią podwójne pozycje mostkowe, a orientacja wiązania O-H jest prostopadła do powierzchni. Ponadto energia adsorpcji zmniejsza się wraz ze wzrostem ilości grup OH na powierzchni.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 931-933
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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