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Wyświetlanie 1-15 z 56
Tytuł:
TLC screening in searching for active components in Rhodiola rosea L. roots
Autorzy:
Nikolaichuk, Hanna
Choma, Irena Maria
Powiązania:
https://bibliotekanauki.pl/articles/2079949.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Rhodiola rosea
rhodiola roots
rhodiola roots extract
TLC
Opis:
Thin layer chromatography (TLC) has been used for screening analysis of extracts from Rhodiola rosea roots. TLC is a fast, simple and inexpensive screening technique, often used in qualitative analysis of plant substances. The results of TLC analysis confirmed presence of sugars, terpenes, terpenoids, saponines and propylpropanoids in Rhodiola roots. The extracts of Rhodiola rosea revealed strong antioxidant activity.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2019, 74, 1; 55-63
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the minirhizotron technique to studying the roots of fruit plants
Autorzy:
Głuszek, S
Sas Paszt, L
Sumorok, B.
Derkowska, E
Kozera, R.
Powiązania:
https://bibliotekanauki.pl/articles/102243.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
minirhizotron
fine roots
pomological plants
Opis:
Minirhizotron, a non-destructive technique is based on the application of transparent tubes, located in plant’s root zone. This method has been known since the beginning of 20th century and is used for plant root’s observations, especially in forest trees (Scots pine, Norway spruce, silver fir, birch), steppe grasses, vegetables and cereals. Minirhizotron technique is also applicable to pomological plants observations, mostly apples, but many others orchard species were observed with this method last years. The study of root growth dynamics in fruit plants using the non-destructive, minirhizotron method is conducted in the Pomological Orchard in Skierniewice. The objects of the observations are the roots of: apple trees cultivar. ‘Gold Milenium’, blackcurrant bushes cultivar ‘Tiben’ and sweet cherry cultivar ‘Vanda’. The observations were carried out monthly over a period of from March to November.
Źródło:
Advances in Science and Technology. Research Journal; 2013, 7, 18; 45-53
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How to solve third degree equations without moving to complex numbers
Autorzy:
Dawidowicz, Antoni Leon
Powiązania:
https://bibliotekanauki.pl/articles/1789260.pdf
Data publikacji:
2020-12-31
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
roots of third-degree equations
Opis:
During the Renaissance, the theory of algebraic equations developed in Europe. It is about finding a solution to the equation of the form anxn + . . . + a1x + a0 = 0, represented by coefficients subject to algebraic operations and roots of any degree. In the 16th century, algorithms for the third and fourth-degree equations appeared. Only in the nineteenth century, a similar algorithm for the higher degree was proved impossible. In (Cardano, 1545) described an algorithm for solving third-degree equations. In the current version of this algorithm, one has to take roots of complex numbers that even Cardano did not know. This work proposes an algorithm for solving third-degree algebraic equations using only algebraic operations on real numbers and elementary functions taught at High School.
Źródło:
Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia; 2020, 12; 123-131
2080-9751
2450-341X
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Note on the Permanental Roots of Bipartite Graphs
Autorzy:
Zhang, Heping
Liu, Shunyi
Li, Wei
Powiązania:
https://bibliotekanauki.pl/articles/30147218.pdf
Data publikacji:
2014-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
permanent
permanental polynomial
permanental roots
Opis:
It is well-known that any graph has all real eigenvalues and a graph is bipartite if and only if its spectrum is symmetric with respect to the origin. We are interested in finding whether the permanental roots of a bipartite graph G have symmetric property as the spectrum of G. In this note, we show that the permanental roots of bipartite graphs are symmetric with respect to the real and imaginary axes. Furthermore, we prove that any graph has no negative real permanental root, and any graph containing at least one edge has complex permanental roots.
Źródło:
Discussiones Mathematicae Graph Theory; 2014, 34, 1; 49-56
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of antioxidant capasity in wild and transformed Kumato and Cherry tomatoes roots and culture media using the DPPH method
Autorzy:
Ostaszewska, Urszula
Powiązania:
https://bibliotekanauki.pl/articles/1179343.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
DPPH metod
antioxidant capasity
tomatoes roots
Opis:
The aim of this project was to compare the effect of Rhizobacterium rhizogenes infection, and subsequent hairy root induction, on the antioxidant capacity of in vitro root cultures derived from two tomato cultivars differing in flavonoid biosynthetic potential. Tomatoes and especially processed tomatoes are rich in lycopene ,which is one of the most powerful antioxidants. Antioxidan capasity of normal (wild) roots from Kumato and Cherry seeds and transformed roots from infected cotyledons with agrobacterium was determined by the DPPH metod. The results presented in this paper indicate that the normal roots extracts and extracellular had higher antioxidants capasity than transformed roots but antioxidant capasity was higher in the extracellular than in the roots extract. Standard deviation was higher in extracellular than roots extract. This experiment was valuable because antioxidants protect human body against oxidative stress which can cause many diseases such as diabetes and accelerate the aging process of the organism.
Źródło:
World Scientific News; 2017, 78; 114-121
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coordinates of maximal roots of weakly non-negative unit forms
Autorzy:
Dräxler, P.
Golovachtchuk, N.
Ovsienko, S.
de la Pena, J.
Powiązania:
https://bibliotekanauki.pl/articles/966106.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
positive roots
tame algebras
quadratic forms
Źródło:
Colloquium Mathematicum; 1998, 78, 2; 163-193
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Colonization of decomposing Sphagnum moss litter by mycorrhizal roots in two types of peatland ecosystems
Autorzy:
Wilk, Mateusz
Pawłowska, Julia
Wrzosek, Marta
Gorczak, Michał
Suska-Malawska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/765033.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
peatlands
Sphagnum decomposition
roots
mycorrhizal colonization
mycorrhizae
Opis:
Podczas blisko trzyletnich badań nad rozkładem mchu torfowca na torfowisku przejściowym oraz w borze bagiennym w północno-wschodniej Polsce zaobserwowano kolonizację materiału roślinnego w woreczkach ściółkowych przez silnie zmykoryzowane korzenie. Procentowa zawartość tych korzeni, wyrażona jako stosunek ich suchej masy do suchej masy rozkładających się szczątków roślinnych, generalnie zwiększała się wraz z upływem czasu w borze bagiennym, natomiast w przypadku torfowiska przejściowego nie wykazała wyraźnych tendencji; z racji niewielkiej liczby powtórzeń zaobserwowane różnice nie były jednak istotne statystycznie. W materiale roślinnym rozkładającym się na torfowisku przejściowym odnotowano obecność dwóch morfotypów korzeni wrzosowatych oraz dwóch morfotypów korzeni ektomykoryzowych, natomiast w borze bagiennym odnotowano jeden morfotyp korzeni wrzosowatych i 9 morfotypów korzeni ektomykoryzowych. Tylko jeden morfotyp wrzosowatych i jeden ektomykoryzowy były odnotowane w obu typach siedlisk; różnice wynikały z zasadniczych różnic w składzie zbiorowisk roślinnych pomiędzy badanymi powierzchniami. Większość (7 z 10) morfotypów ektomykoryz pojawiła się tylko raz podczas całego okresu trwania eksperymentu. Badania molekularne uzyskanych morfotypów powiodły się jedynie w siedmiu przypadkach: zidentyfikowano jeden gatunek tworzący mykoryzę erikoidalną, trzy gatunki tworzące ektomykoryzy (w tym jeden tworzący dwa morfotypy) oraz dwa gatunki grzybów wielkoowocnikowych znanych jako saprotrofy, prawdopodobnie wtórnie infekujących korzenie. Sekwencje uzyskane z pozostałych badanych morfotypów należały do grzybów mikroskopijnych najprawdopodobniej kolonizujących korzenie jako saprotrofy lub endofity. Pomimo że badania niniejsze stanowią jedynie szkicowe studium, to jednoznacznie wskazują na możliwość udziału grzybów mykoryzowych w procesach rozkładu materii roślinnej w ekosystemach torfowiskowych.
During a 35-month study on the decomposition of Sphagnum moss litter in poor fen and pine bog forest, an intensive colonization of litter-bags by mycorrhizal roots was observed during the decomposition process. Content of mycorrhizal roots in litter-bags, expressed as % mass of roots, was generally increasing during the decomposition in pine bog forest, and fluctuating during decomposition on poor fen, although in both cases the results were statistically insignificant. Two morphotypes of ericoid roots and two morphotypes of ectomycorrhizal roots were recorded from litter-bags on poor fen during the decomposition experiment, while in pine bog forest one morphotype of ericoid and nine morphotypes of ectomycorrhizal roots were recorded. Molecular identification of mycorrhizal roots succeeded only in the case of one ericoid and six putatively ectomycorrhizal morphotypes. Most morphotypes were recorded only once during the whole 35-month decomposition period, and only one ericoid and one ectomycorrhizal morphotypes were shared between the poor fen and pine bog forest communities.
Źródło:
Acta Universitatis Lodziensis. Folia Biologica et Oecologica; 2014, 10; 113-121
1730-2366
2083-8484
Pojawia się w:
Acta Universitatis Lodziensis. Folia Biologica et Oecologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of bacterial communities in roots of selected trees with and without summer truffle (Tuber aestivum) ectomycorrhiza
Autorzy:
Siebyła, Marta
Szyp-Borowska, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/2041241.pdf
Data publikacji:
2021
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
mycorrhiza
NGS
soil microorganisms
summer truffle ascomata
roots
Opis:
In this study, we examined the effect of the presence of mycorrhiza and ascomata of summer truffle (Tuber aestivum) on the bacterial composition of roots from small trees growing in selected sites of the Nida Basin. Qualitative DNA sequencing methods such as Sanger and next-generation sequencing (NGS) were used. The Sanger method revealed different bacterial species compositions between the samples where summer truffle ascomata was recorded and control samples. Five genera of bacteria could be distinguished: Bacillus, Erwinia, Pseudomonas, Rahnella and Serratia, among which the most numerous were Pseudomonas (Gammmaproteobacteria class) at 32.9%. The results obtained by the NGS method also showed differences in species composition of the bacteria depending on the study sample. Seven genera of bacteria were distinguished: Rhizorhabdus, Methylotenera, Sphingomonas, Nitrosospira, Streptomyces, Methyloceanibacter and Niastella, which dominated in roots from the truffle sites. Telmatobacter, Roseiarcus, Granulicella, Paludibaculum, Acidipila, Acidisphaera and Aliidongia dominated in roots from the control sites. With the NGS method, it is possible to identify the microbiome of a whole root, while only a root fragment can be analysed by the Sanger method. These results extend the scope of knowledge on the preferences of certain groups of bacteria associated with truffles and their influence on the formation of ascomata in summer truffles. Our results may also be useful in selecting and monitoring sites that promote ascomata of Tuber aestivum.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2021, 63, 2; 97-111
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The roots of armed conflicts: Multilevel security perspective
Autorzy:
Żakowska, Marzena
Powiązania:
https://bibliotekanauki.pl/articles/1194358.pdf
Data publikacji:
2020
Wydawca:
Akademia Sztuki Wojennej
Tematy:
state
roots
human being
armed conflicts
international system
Opis:
The aim of this study is to indicate the roots of armed conflicts based on an analysis of a variety of theoretical approaches. The methodological framework for this research is Kenneth Waltz’s concept of analytical levels’ causes of armed conflicts: (1) the level of individual; (2) the level of the state; (3) the level of the international system. The armed conflicts are also generated by the nature of state regime and society, security dilemma mechanism, diversity between economic development, and rapidly growing population. The anarchy of the international system causes war, particularly due to the imbalance of power, power transition, challenging the hegemonic state by a rising power. The author presents a proposition of systematizing roots of armed conflicts and highlight the need for starting a discussion about developing approaches for the analysis of the roots of modern armed conflicts. The author highlights the need for starting a discussion about developing approaches for the analysis of the roots of modern armed conflicts. The starting point for discussion is introduced the concept of primary and supplementary approaches.
Źródło:
Security and Defence Quarterly; 2020, 30, 3; 49-64
2300-8741
2544-994X
Pojawia się w:
Security and Defence Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the computation of the Nielsen numbers and the converse of the Lefschetz coincidence theorem
Autorzy:
Wong, Peter
Powiązania:
https://bibliotekanauki.pl/articles/1215078.pdf
Data publikacji:
1992
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
fixed points
coincidences
roots
Lefschetz number
Nielsen number
Opis:
Let $f,g:M_1 → M_2$ be maps where $M_1$ and $M_2$ are connected triangulable oriented n-manifolds so that the set of coincidences $C_{f,g}= {x ∈ M_1 | f(x)=g(x)}$ is compact in $M_1$. We define a Nielsen equivalence relation on $C_{f,g}$ and assign the coincidence index to each Nielsen coincidence class. In this note, we show that, for n ≥ 3, if $M_2= \widetilde M_2/K$ where $\widetilde M_2$ is a connected simply connected topological group and K is a discrete subgroup then all the Nielsen coincidence classes of f and g have the same coincidence index. In particular, when $M_1$ and $M_2$ are compact, f and g are deformable to be coincidence free if the Lefschetz coincidence number L(f,g) vanishes.
Źródło:
Fundamenta Mathematicae; 1991-1992, 140, 2; 191-196
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semantic (and formal) derivation from the Common Slavic root *prav‑ in Polish and in Macedonian
Semantyczna (i formalna) derywacja od ps. rdzenia * prav‑ na gruncie polskim i macedońskim
Autorzy:
Topolińska, Zuzanna
Powiązania:
https://bibliotekanauki.pl/articles/2084453.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
*prav‑
semantic derivation
verbal roots
Macedonian language
Polish language
Opis:
The author supports the thesis that the semantic derivation presents the basic mechanism enriching our lexical resources.
Źródło:
Rocznik Slawistyczny; 2021, 70; 161-166
0080-3588
Pojawia się w:
Rocznik Slawistyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Making History from Everyday Life of Common People: The Oral History Studies in a Chinese Village
Autorzy:
Yuhua, Guo
Powiązania:
https://bibliotekanauki.pl/articles/1929555.pdf
Data publikacji:
2009-09-30
Wydawca:
Polskie Towarzystwo Socjologiczne
Tematy:
social bitterness
grass-roots history
subaltern narratives
oral history
Opis:
Narratives of personal histories of “bitterness” told by peasants who refer to themselves as “suffering people” (shouku ren) occupy a significant place in oral accounts of rural life in China in the second half of the twentieth century. They constitute both an important academic resource and an independent field of knowledge production. The social dimensions of “suffering” establish an organic link between the everyday lives of ordinary people and broader social history, such that the deep roots of “suffering” can only be apprehended from the perspective of social structures and power relationships. Seeing the everyday practices of ordinary peasants as an integral part of “civilisation” links peasants’ life histories with the macro processes of social history. It gives the mundane, even trivial, experiences and accounts of peasants’ lives an extraordinary significance as organic components of the grand historical narrative.
Źródło:
Polish Sociological Review; 2009, 167, 3; 399-414
1231-1413
2657-4276
Pojawia się w:
Polish Sociological Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EFFECTS OF THE GEZI PARK MOVEMENT ON RENEWAL OF THE DEMOCRATIZATION DEBATE IN TURKEY
Autorzy:
Yildirim, Yavuz
Powiązania:
https://bibliotekanauki.pl/articles/643020.pdf
Data publikacji:
2016
Wydawca:
Fundacja Copernicus na rzecz Rozwoju Badań Naukowych
Tematy:
Turkey
democratization
grass-roots movements
civil society
Gezi Park
Opis:
*This is an English version of an original article:    Yavuz Yildirim, "Los Efectos Del Movimiento Del Parque Gezi En La Renovacion Del Debate Sobre La Democratizacion En Turquia" in: Un Retrato De La Turquia Contemporanea (eds. Federico Donelli, Alessia Chiriatti, Manuel Férez), Mexico: Universidad Anahuac Mexico, 2016, pp. 299-310.The text presents the history of attempts at democratization of the political system in Turkey, where despite the nominal presence of democratic institutions, changes traditionally have come from the top. Following a brief presentation of the unsuccessful civil movements from the 1970s onwards, it focuses on the 2010s transition in approaches to building democratic culture, and in particular on the Gezi Park resistance, where a relatively minor local issue sparked a country-wide citizens’ protest against the conservative democracy of the ruling AK Party. The event is shown as an entirely new type of protest, a spontaneous civil movement with horizontal structure, inspired by the Occupy movements, and an expression of the new generation’s approach to politics. It also gave rise to a movement which contributed to rethinking the Turkish democratization process by breaking with the established thinking with a bottom-to-top approach.
Źródło:
The Copernicus Journal of Political Studies; 2016, 1
2299-4335
Pojawia się w:
The Copernicus Journal of Political Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is network theory the most suitable for understanding terrorist radicalisation?
Autorzy:
Reinskou, Mari Cecilie Tolfsen
Powiązania:
https://bibliotekanauki.pl/articles/534437.pdf
Data publikacji:
2017
Wydawca:
Wyższa Szkoła Biznesu w Dąbrowie Górniczej
Tematy:
Terrorism
International security
Roots of terrorism
Theories of terrorism
Opis:
Terrorist radicalisation has been broadly discussed in different research environments, and there are many different opinions about reasons why some people resort to such extreme acts of terrorism. In January 2015, the Kouachi brothers went into the satire company of Charlie Hebdo in France and killed 12 people, and in November the same year a group of terrorists killed 139 people in different attacks in Paris. There have been many terrorist attacks not only in European countries, but also around the world in general. It is not something new, but globalisation and closeness to the media make us more aware of the terror than earlier. The purpose of the paper is to argue, by using different theories within the terrorism studies, that network theory is not the most suitable way to understand terrorist radicalisation, but that different theories in general supplement each other. At the beginning terminology will be explained, followed by introducing network theory, comparing theories on the basis of different factors like understanding terrorist's background, and look at both internal and external factors that influence individuals. Subsequently, different theories will be compared on how well they explain the root causes for violent actions leading to final conclusions.
Źródło:
Security Forum; 2017, 1, Volume 1 No. 1/2017; 39-47
2544-1809
Pojawia się w:
Security Forum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overabundance and privation as predictors of materialism in young adults
Autorzy:
Poraj-Weder, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/2126088.pdf
Data publikacji:
2019-04-08
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
materialism
deprivation roots of materialism
excess
overabundance
privation
poverty
Opis:
The aim of the present study was to determine how the social and material status of the family of origin and the degree of satisfaction of material needs during childhood (excessive vs. insufficient) engender materialism in young adults. The participants in the study were 346 individuals aged 20 to 35. To measure materialism, the following scales were used: the Material Values Scale by Richins; the Priorities in Life Scale; and the Motives for Making Money Scale by Srivastav, Locke, and Bartol. Socioeconomic variables were measured with the author’s own tool. The results indicate that the low socioeconomic status of the family of origin and the experience of privation in early life increase the attractiveness of material goods and money, and thus contribute to the formation of the materialistic orientation. The experience of overabundance during childhood, by contrast, is negatively correlated with materialism. This, however, does not mean that being spoiled has no negative consequences. It appears that people who were showered with material goods in childhood lose the ability to appreciate their abundance. They feel they do not have enough material goods, even if they have more than others.
Źródło:
Roczniki Psychologiczne; 2018, 21, 3; 207-229
1507-7888
Pojawia się w:
Roczniki Psychologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 56

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