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Wyświetlanie 1-15 z 190
Tytuł:
Phytopharmacological study of red, white and black variety of Abrus precatorius L.
Autorzy:
Garaniya, N.H.
Bapodra, A.H.
Ladva, K.D.
Powiązania:
https://bibliotekanauki.pl/articles/11319.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
phytopharmacology
red variety
white variety
black variety
Abrus precatorius
medicinal plant
flavonoids
steroid
Opis:
Abrus precatorius L. is a leguminous plant of family fabaceae. Plant parts are widely used for medicinal purpose in different region of the world. Seed behavior and phytochemical evaluation of different solvent extracts (i.e. Petroleum ether, Ethyl acetate, Methanol & Water) of leaf and seed of red, white and black varieties of Abrus precatorius L. is carried out in the present study. This study indicates presence of different phytoconstituents i.e. alkaloids, steroids, glycosides, proteins, etc. the present study concludes that the plant parts can be used as very good natural remedy to diagnosed variety of dieses.
Źródło:
International Letters of Natural Sciences; 2014, 09
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The greatest regular-solid variety of semigroups % Dedicated to R. McKenzies 60$^th$ birthday %
Autorzy:
Denecke, Klaus
Koppitz, Jörg
Pabhapote, Nittiya
Powiązania:
https://bibliotekanauki.pl/articles/728806.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
hypersubstitutions
terms
regular-solid variety
solid variety
finite axiomatizability
Opis:
A regular hypersubstitution is a mapping which takes every $n_i$-ary operation symbol to an $n_i$-ary term. A variety is called regular-solid if it contains all algebras derived by regular hypersubstitutions. We determine the greatest regular-solid variety of semigroups. This result will be used to give a new proof for the equational description of the greatest solid variety of semigroups. We show that every variety of semigroups which is finitely based by hyperidentities is also finitely based by identities.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2008, 28, 1; 91-119
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Locally finite M-solid varieties of semigroups
Autorzy:
Denecke, Klaus
Pibaljommee, Bundit
Powiązania:
https://bibliotekanauki.pl/articles/728932.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
locally finite variety
finitely based variety
M-solidvariety
Opis:
An algebra of type τ is said to be locally finite if all its finitely generated subalgebras are finite. A class K of algebras of type τ is called locally finite if all its elements are locally finite. It is well-known (see [2]) that a variety of algebras of the same type τ is locally finite iff all its finitely generated free algebras are finite. A variety V is finitely based if it admits a finite basis of identities, i.e. if there is a finite set σ of identities such that V = ModΣ, the class of all algebras of type τ which satisfy all identities from Σ. Every variety which is generated by a finite algebra is locally finite. But there are finite algebras which are not finitely based. For semigroup varieties, Perkins proved that the variety generated by the five-element Brandt-semigroup
$B¹₂ = { \begin{pmatrix} 0 & 0 \\ 0 & 0\end{pmatrix}, \begin{pmatrix} 1 & 0 \\ 0 & 0\end{pmatrix}, \begin{pmatrix} 0 & 1 \\ 0 & 0\end{pmatrix}, \begin{pmatrix} 0 & 0 \\ 1 & 0\end{pmatrix}, \begin{pmatrix} 0 & 0 \\ 0 & 1\end{pmatrix}}$
is not finitely based ([9], [10]). An identity s ≈ t is called a hyperidentity of a variety V if whenever the operation symbols occurring in s and in t, respectively, are replaced by any terms of V of the appropriate arity, the identity which results, holds in V. A variety V is called solid if every identity of V also holds as a hyperidentity in V. If we apply only substitutions from a set M we speak of M-hyperidentities and M-solid varieties. In this paper we use the theory of M-solid varieties to prove that a type (2) M-solid variety of the form $V = H_{M}Mod{F(x₁,F(x₂,x₃)) ≈ F(F(x₁,x₂),x₃)}$, which consists precisely of all algebras which satisfy the associative law as an M -hyperidentity is locally finite iff the hypersubstitution which maps F to the word x₁x₂x₁ or to the word x₂x₁x₂ belongs to M and that V is finitely based if it is locally finite.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2003, 23, 2; 139-148
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary results from sculpture analysis of the apiculate miospores from the Upper Visean of Kaluga region, Russia
Autorzy:
Mamontov, D.A.
Orlova, O. A.
Powiązania:
https://bibliotekanauki.pl/articles/184779.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
palynoassemblage
variety
variation
Opis:
Palynological materials for the present study are well preserved apiculate miospores collected from palynoassemblage MS-6 of Mstikhino quarry, Kaluga Region. The unique palynoassemblage MS-6 has been extensively studied by the authors in recent years (Mamontov 2012, Mamontov & Orlova 2014). The unusual attribute of the assemblage is a great variety of the miospores with transition apiculate sculpture (grain-coni-papillae). However, it remained unclear whether the different ornamentation types had similar ranges of variation within both the sculptural elements and arrangement of the ornaments. The general purpose of the research is comparison of similar sculptural patterns from triangular apiculate miospores based on the range of morphological variation. Preliminary results of sculpture analysis of some apiculate miospores from the locality have been obtained. For the present study thirty specimens of each species Granulatisporites granulatus Ibrahim, Iugisporis subintortus (Kedo) Mamontov comb. nov., Lophotriletes parviverrucosus (Waltz) Kedo were accidentally sampled from the assemblage MS-6. All specimens were examined by the methods of transmitted light and scanning electron microscopy. Additionally we applied the model of sculptural analysis introduced and modified by Vezey et al. (1992). Measurements of sculptural features were carried out by the image-analyzing software ImageJ. Statistical data were summarized in the MS Excel. Thus several sculpture variables have been measured: - average Wadell’s diameter (it is diameter of circle having a same area as a base of the sculpture elements (grain, coni or papillae)); - average height of the elements; - average distance between the edges of adjacent elements; - average polar diameter of spore; - average length of the trilete rays; - spore outline; - quantity of elements on the visible spore hemisphere; - quantity of elements are located along the spore equator. Fifty measurements of the each variable were produced. Range of variation for the features was evaluated by coefficient of variation (CV). As a result of the analysis the three species are defined by continuous variation of the polar outline between triangular concave to triangular with slightly convex sides. Similarities within shape and size of the elements were indicated. Grains, coni and papillae are characterized by similar continuous variation of apices with blunt, pointed and rounded shape. Some of the elements are supplied by bifurcating tops while the other ones are fused by the bases. Amount of the elements is differed within each species. Ornamentation of the Granulatisporites granulatus is restricted by about 290 elements of the proximal hemisphere. The same feature of the Iugisporis subintortus is defined by about 212 coni-like elements. In contrast the Lophotriletes parviverrucosus are attributed by about 170 sculptural unites. All specimens of Iugisporis are characterized by medium coefficient of variation 26% for diameter of the base of the coni (Wadell’s diameter), but the CV of height of the elements is about 35%. Variation of the distance between the coni is extremely high 60%. For the Lophotriletes specimens CV of the Wadell’s diameter is increased up to 30% and variation of the height of papillae became more stronger – 44%. However, there are no differences in CV of the distance between the papillae in comparison to the Iugisporis. Coefficient of variation of Wadell’s diameter for specimens of Granulatisporites is indicated by level 25%. Variability of grain height is about to 30%. However, variance of distance between the adjacent grains is decreased up to 40% in contrast to other species. Variation of the polar diameter and length of rays from the all specimens are inconspicuous changed up to 12%. Additionally specimens of the all species are marked by correlation between amount of elements along the spore equator and concavity of the interradial sides of spore outline. Quantity of the equatorial elements was salutatory increased while the interradial sides became more concave. However it would generally depend on the average polar diameter of the spores. Significantly, size of the sculptural elements unevenly increased ongoing from polar area to equatorial margin of the spores. In additional, continuous variation between granulate, coni and papillae ornamentations have been observed within the studied specimens. Accordingly, all morphological features of the genera Granulatisporites , Iugisporis , Lophotriletes were subdivided into three categories: 1) common characteristics which are more stable: polar diameter, length of rays, spore outline; 2) variable characteristics which are defined by high coefficient of variation: quantity of elements, height of the elements, distance between the edges of adjacent elements, Wadell’s diameter; 3) variable qualitative characteristics: shape, type and distribution of sculptural unites. The results lead us to believe that such qualitative characters as type, shape and arrangement of sculpture elements are strongly connected with measured CV of characteristics from b) category. In accordance to morphon concept introduced by van der Zwan (1979) the group of miospore species is united in morphon by similar continuous variation of morphological features. Therefore, such morphologically similar species have the same range of CV of the coincident sculpture features. However it should be noted that this conclusion are restricted by common occurrence of transitional sculpture variations of the apiculate spores. Also it is possible that different value CV from different variables were caused by the different role of the sculptural feature in natural selection.
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 95-96
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The examination of distinctness, uniformity and stability of rye varieties in Poland.
Autorzy:
Borys, Julia
Grzesiek, Hanna
Waszak, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/2198927.pdf
Data publikacji:
2003-12-21
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
variety testing
rye
Opis:
In addition the rye variety is included into the Register of Cultivars on condition of satisfactory economic value (value for cultivation and use or VCU). Entry of the variety into the Register of Cultivars is rye variety seed marketing requirement. In Poland the administration of the statutory variety examination (DUS and VCU tests) and the maintenance of the Register of Cultivars and the Register of Plant Breeder’s Rights are provided by the Research Centre for Cultivar Testing (COBORU) located at Slupia Wielka. The organization and procedure of the examination of DUS of rye varieties for Polish requirements are outlined. Every rye variety must pass the examination of Distinctness, Uniformity and Stability (DUS testing) before entry into the Register of Cultivars (National List) and/or granting of Plant Breeder’s Rights (PBR).
Źródło:
Plant Breeding and Seed Science; 2003, 48; 155-161
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On varieties of orgraphs
Autorzy:
Haviar, Alfonz
Monoszová, Gabriela
Powiązania:
https://bibliotekanauki.pl/articles/743478.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
orgraph
variety
lattice
Opis:
In this paper we investigate varieties of orgraphs (that is, oriented graphs) as classes of orgraphs closed under isomorphic images, suborgraph identifications and induced suborgraphs, and we study the lattice of varieties of tournament-free orgraphs.
Źródło:
Discussiones Mathematicae Graph Theory; 2001, 21, 2; 207-221
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Gaussian measure on algebraic varieties
Autorzy:
Agricola, Ilka
Friedrich, Thomas
Powiązania:
https://bibliotekanauki.pl/articles/1205282.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Gaussian measure
algebraic variety
Opis:
We prove that the ring ℝ[M] of all polynomials defined on a real algebraic variety $M⊂ℝ^n$ is dense in the Hilbert space $L^2(M,e^{-|x|^2}dμ)$, where dμ denotes the volume form of M and $dν = e^{-|x|^2}dμ$ the Gaussian measure on M.
Źródło:
Fundamenta Mathematicae; 1999, 159, 1; 91-98
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
All regular-solid varieties of idempotent semirings
Autorzy:
Hounnon, Hippolyte
Powiązania:
https://bibliotekanauki.pl/articles/38114594.pdf
Data publikacji:
2017-06-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
semiring
hypersubstitution
regular hypersubstitution
regular hyperidentity
solid variety
regular-solid variety
Opis:
The lattice of all regular-solid varieties of semirings splits in two complete sublattices: the sublattice of all idempotent regular-solid varieties of semirings and the sublattice of all normal regular-solid varieties of semirings. In this paper, we discuss the idempotent part.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2017, 37, 1; 5-12
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the characterisation of Maltsev and Jónsson-Tarski algebras
Autorzy:
Smith, Jonathan
Powiązania:
https://bibliotekanauki.pl/articles/728924.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
Mal'tsev variety
Mal'tsev algebra
Jónsson-Tarski variety
Jónsson-Tarski algebra
Goldie variety
Goldie algebra
congruence permutability
simplicial object
Opis:
There are very strong parallels between the properties of Mal'tsev and Jónsson-Tarski algebras, for example in the good behaviour of centrality and in the factorization of direct products. Moreover, the two classes between them include the majority of algebras that actually arise 'in nature'. As a contribution to the research programme building a unified theory capable of covering the two classes, along with other instances of good centrality and factorization, the paper presents a common framework for the characterisation of Mal'tsev and Jónsson-Tarski algebras. Mal'tsev algebras are characterized by simplicial identities in the product complex of an algebra. In the dual of a pointed variety, a simplicial object known as the pointed complex is then constructed. The basic simplicial Mal'tsev identity in the pointed complex characterises Jónsson-Tarski algebras. Higher-dimensional simplicial Mal'tsev identities in the pointed complex are characteristic of a class of algebras lying properly between Goldie and Jónsson-Tarski algebras.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2003, 23, 2; 149-161
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On varieties of graphs
Autorzy:
Haviar, Alfonz
Nedela, Roman
Powiązania:
https://bibliotekanauki.pl/articles/744227.pdf
Data publikacji:
1998
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
graph
subgraph identification
variety
Opis:
In this paper, we introduce the notion of a variety of graphs closed under isomorphic images, subgraph identifications and induced subgraphs (induced connected subgraphs) firstly and next closed under isomorphic images, subgraph identifications, circuits and cliques. The structure of the corresponding lattices is investigated.
Źródło:
Discussiones Mathematicae Graph Theory; 1998, 18, 2; 209-223
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Biostimulants on the Chlorophyll Content and Height of Solanum tuberosum L. Plants
Autorzy:
Mystkowska, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/2173348.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
variety
chlorophyll
potato
variant
Opis:
The effect of foliar feeding with four biostimulants with active substances (Ecklonia maxima algae extract, titanium, humic substances, plant hormones: auxin and cytokinin) on the chlorophyll content and plant height of three Solanum tuberosum cultivars was investigated. A field experiment was carried out in 2015–2017 in eastern Poland in three growing seasons using the split-plot method. The cultivated varieties significantly differentiated the chlorophyll content (SPAD index) and plant height. The research showed the influence of varieties and many years of research on the height of potato plants. The biostimulants increased the value of the SPAD coefficient and the height of the potato plants.
Źródło:
Journal of Ecological Engineering; 2022, 23, 9; 72--77
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary studies of tocochromanol content in seeds of open pollinated and hybrid varieties of winter rape
Wstepne badania zawartosci tokochromanoli w nasionach odmian populacyjnych i mieszancowych rzepaku ozimego
Autorzy:
Nogala-Kalucka, M
Musnicki, C.
Kupczyk, B.
Jasinska-Stepniak, A.
Bartkowiak-Fludra, E.
Siger, A.
Powiązania:
https://bibliotekanauki.pl/articles/833710.pdf
Data publikacji:
2005
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
oilseed rape
hybrid variety
seed
winter oilseed rape
pollinated variety
tocochromanol content
Źródło:
Rośliny Oleiste - Oilseed Crops; 2005, 26, 2; 561-570
1233-8273
Pojawia się w:
Rośliny Oleiste - Oilseed Crops
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE RELATION BETWEEN GEOGRAPHICAL PLACE AND INNOVATIVENESS: THE CASE OF TURKEY
Autorzy:
Falcıoğlu, Pınar
Powiązania:
https://bibliotekanauki.pl/articles/450570.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Gdański. Wydawnictwo Uniwersytetu Gdańskiego
Tematy:
Innovation
geographical concentration
related variety
Opis:
A line of argument in the new growth economy discussions is whether specialization or diversification of economic activity on the geographical scale stimulates innovation. This study explores the relation between innovativeness and different types of geographical concentrations in the case of a developing country. The study addresses the discussion through statistical and econometric analyses using variables such as number of patents, new firm entry and exit at the regional level for the period 1995-2001. The results do not confirm that regions with higher levels of related variety or specialization are more innovative, but instead regions with higher levels of variety are found to be more innovative supporting the diversity thesis.
Źródło:
International Journal of Emerging and Transition Economies (IJETE); 2011, 4, 1-2; 75-95
1308-2701
Pojawia się w:
International Journal of Emerging and Transition Economies (IJETE)
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dialekt a język. Czynniki kształtujące rzeczywistość językową na przykładzie budowy statusu języka kastylijskiego
Dialect and language. Factors that create linguistic reality based on status evolution of the Castilian language
Autorzy:
Korsak-Suska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2109877.pdf
Data publikacji:
2019-12-30
Wydawca:
Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku
Tematy:
dialect
language
variety
Castilian
status
Opis:
The aim of this paper was to reduce confusion around the concepts of dialect and language. Although linguists often use separate terms, there are no linguistic criteria to make a distinction between the two. It is also difficult to delineate the boundaries of specific languages or dialects. Classification attempts may lead to developing linguistic hierarchy, therefore it is necessary to know that any distinction is artificial and arbitrary. In view of no clear definitions of dialect and language, the use of a neutral term “variety” is preferred. Human perception of linguistic reality – diverse varieties and their mutual relations – is the outcome of subjective, political decisions and organised social activity. Distinction between a dialect and a language is volatile – e.g. colloquial Latin had evolved into dialects that, over time, transformed into the Romance languages. The evolution of the Castilian language on the Iberian Peninsula shows how social and political factors, rather than linguistic ones, influence the actual status of a linguistic variety.
Źródło:
Białostockie Archiwum Językowe; 2019, 19; 205-224
1641-6961
Pojawia się w:
Białostockie Archiwum Językowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the real \(X\)-ranks of points of \(\mathbb{P}^n(\mathbb{R})\) with respect to a real variety \(X\subset\mathbb{P}^n\)
Autorzy:
Ballico, Edoardo
Powiązania:
https://bibliotekanauki.pl/articles/747029.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
Ranks
real variety
structured rank
Opis:
Let \(X\subset\mathbb{P}^n\) be an integral and non-degenerate \(m\)-dimensional variety defined over \(\mathbb{R}\). For any \(P \in \mathbb{P}^n(\mathbb{R})\) the real \(X\)-rank \(r_{X,\mathbb{R}}(P)\) is the minimal cardinality of \(S\subset X(\mathbb{R})\) such that \(P\in \langle S\rangle\). Here we extend to the real case an upper bound for the \(X\)-rank due to Landsberg and Teitler.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2010, 54, 2
0365-1029
2083-7402
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 190

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