1,690 research outputs found
A glimpse of Borodin...
No full textCraig Graham McKay, A glimpse of Borodin...
M.N. Roy has given an amusing portrait of Comrade Borodin's arrival in Mexico in 1919. But what was Borodin doing prior to his mission to the New World with the Crown Jewels? On the basis of Scandinavian police reports, the author supplies a piece of the puzzle and at the same time throws some light on the propaganda activities of the Bolsheviks.Craig Graham McKay, Un aperçu de Borodin...
M.N. Roy a brossé un portrait amusant de l'arrivée du camarade Borodin au Mexique en 1919. Mais que faisait Borodin avant sa mission dans le Nouveau Monde avec les bijoux de la Couronne ? En se fondant sur des rapports de la police Scandinave, l'auteur fournit une pièce du puzzle et jette en même temps quelque lumière sur les activités des bolcheviks en matière de propagande.McKay Craig Graham. A glimpse of Borodin.... In: Cahiers du monde russe et soviétique, vol. 27, n°1, Janvier-Mars 1986. pp. 107-110
FIGURE 1 in Reinstatement of Heptapterus longicauda (Borodin, 1927)
No full textFIGURE 1. Type specimens of Imparfinis longicauda Borodin (A; Borodin, 1927, fig. 3) and Pimelodus longicauda Boulenger (B, dorsal view; C, lateral view; from Boulenger, 1887, Plate XX, fig. 2)Published as part of Deprá, Gabriel De Carvalho, Laan, Richard Van Der & Azevedo-Santos, Valter M., 2023, Reinstatement of Heptapterus longicauda (Borodin, 1927), pp. 147-150 in Zootaxa 5227 (1) on page 147, DOI: 10.11646/zootaxa.5227.1.9, http://zenodo.org/record/751849
Reinstatement of Heptapterus longicauda (Borodin, 1927)
No full textDeprá, Gabriel De Carvalho, Laan, Richard Van Der, Azevedo-Santos, Valter M. (2023): Reinstatement of Heptapterus longicauda (Borodin, 1927). Zootaxa 5227 (1): 147-150, DOI: https://doi.org/10.11646/zootaxa.5227.1.
[[alternative]]Research of Borodin Symphony No.2 in B minor
No full text[[abstract]]鮑羅定將化學視為一生的職志,其卓越的音樂創作,不過是興趣的發
揮.音樂史上雖肯定鮑羅定作品的不朽性,但仍將他定位成業餘的音樂家,
因此探討鮑羅定及其作品的文獻並不多,尤其在國內針對此課題的研究更
是乏人問津.於是選定筆者最為欣賞,亦是鮑羅定最知名的作品之一--[B小
調第二號交響曲]為論文題目.本論文先就鮑羅定的時代背景,生平及音樂
風格開始探討.進入主題之後,首先介紹鮑羅定B小調第二號交響曲的創作
歷程,首演經過及音樂特質;而後深入樂曲分析-包括曲式,結構,和聲進行,
以及配器法之探討;進而推衍指揮法,除了筆者的心得外,更從現場演奏與
CD有聲資料的版本比較中,領略各指揮家的風格與詮釋,以期洞悉原作的精
髓,而提昇實際的指揮技巧與音樂內涵的掌握.另外,在本論文中亦嘗試以
此曲作調性與色彩的探討.鮑羅定的[B小調第二號交響曲]對尚未到過俄國
的人提供了完整的俄國人民生活的寫照.樂曲中洋溢著無比的氣魄,及對生
活的熱愛,也充分表現出自然雄渾的力量.它是對俄羅斯自然的謳歌,也是
對照耀俄羅斯大地之太陽的讚歌.鮑羅定雖在原譜上清楚地標示出速度等
記號,但後人的詮釋並不完全依循原作之要求,各家的差異性很大,卻也皆
合理.尤其筆者參考的五位大師中有三位是俄國指揮家,風格迴異,但樂評
皆稱為"鮑羅定的代言人".這可解釋為鮑羅定作品的實驗性與包容性,一如
芭蕾舞劇的精神內涵-自由,彈性,演奏者可自由發揮其美學理念,因而使其
音樂更為多元化,藝術化.無怪乎英國作曲家Philip Heseltine推崇鮑羅定
為"傳統交響樂形式作曲家中,十九世紀的最後四分之一期之最偉大的藝術
家."
Abstract Borodin composed many outstanding works
although he wasmore notable as a chemist. There are few studies
about his musical works inliterature because he is considered,
however, as an amateur by many musicians. This research about
Symphony No. 2, one of his most performed works, is to analyze
this work and to investigate how people interpret it. A
literature review was made including the life of Borodin,the
development of literature, fine art, and music in his time, the
characteristics of his music, and the progress of writing
Symphony No. 2. Emphases were also placed upn the premiere of
Symphony No. 2. As for the work itself, analyses were made
regarding the structure, form, harmony and orchestration.
Discussions about the association of keys with color were also
conducted by comparing the ideas proposed by several composers
such as Rimsky-Korsakov. Conducting of Symphony No. 2 was
discussed in details based on four recordings, documentation of
a live concert, interviews with conductors, and personal
interpretation by the author. This discussion was followed by an
extensive comparison among the individual recordings and the
live concert. As a nationlist, Borodin Symphony No. 2 provides a
portrait for people who has not been to Russia. This was
conveyed through his lyric melody, colorful orchestration, and
his sophisticated skills to handle forms and passages.
Distinctive differences were perceived although notations such
as tempo signs were clearly marked on the scores. This can be
attributed to the inherent characteristics of his works that are
experimental and comprehensive. This is perhaps why British
composer-Philip Heseltine regard Borodin, in concerning
traditional symphonic form, as the master craftsman of the last
quarter of the nineteenth century.
Abstract Borodin composed many outstanding works
Acyclic 3-choosability of sparse graphs with girth at least 7
No full textAbstractEvery planar graph is known to be acyclically 7-choosable and is conjectured to be acyclically 5-choosable (Borodin et al. 2002 [4]). This conjecture if proved would imply both Borodin’s acyclic 5-color theorem (1979) and Thomassen’s 5-choosability theorem (1994). However, as yet it has been verified only for several restricted classes of graphs. Some sufficient conditions have also been obtained for a planar graph to be acyclically 4- and 3-choosable.We prove that each planar graph of girth at least 7 is acyclically 3-choosable. This is a common strengthening of the facts that such a graph is acyclically 3-colorable (Borodin et al., 1999 [10]) and that a planar graph of girth at least 8 is acyclically 3-choosable (Montassier et al., 2006 [19]). More generally, we prove that every graph with girth at least 7 and maximum average degree less than 145 is acyclically 3-choosable
Borodin-Péché Fluctuations of the Free Energy in Directed Random Polymer Models
No full textWe consider two directed polymer models in the Kardar-Parisi-Zhang (KPZ) universality class: the O’Connell-Yor semi-discrete directed polymer with boundary sources and the continuum directed random polymer with (m, n)-spiked boundary perturbations. The free energy of the continuum polymer is the Hopf–Cole solution of the KPZ equation with the corresponding (m, n)-spiked initial condition. This new initial condition is constructed using two semi-discrete polymer models with independent bulk randomness and coupled boundary sources. We prove that the limiting fluctuations of
the free energies rescaled by the 1/3rd power of time in both polymer models converge to the Borodin-Péché-type deformations of the GUE Tracy–Widom distribution
Purification and characterization of lysozyme in Persian sturgeon, Acipenser persicus (Borodin, 1897) from the Southwest Caspian Sea
No full textLysozyme (N-acetylmuramide glyconohydrolase, (EC 3.2.1.17)) is a unique enzyme which cleaves the β-1,4
linkages of N-acetylmuramic and N-acetylglucosamine of the peptidoglycan, which leads to the lysis of the
bacterial cell wall. Lysozyme, as a self-defense enzyme, is produced in many organs of vertebrates. The present
study describes purification and characterization of lysozyme from Acipenser persicus (Borodin, 1897). After the
extraction process, ion exchange chromatography was utilized to purify the enzyme. The SDS-PAGE analysis
confirmed that the molecular weight was about 14 kDa. Moreover, some of the biochemical properties such as
optimum temperature, pH and the effect of metal ions on the activity of purified enzyme were investigated. Based
on the results the optimum activity and pH were obtained at 50 °C and 6.5 respectively. The purified lysozyme was
active in the presence of different salts including NaCl (0–0.125 M), KCl (0.075–0.125 M), MgCl2, and CaCl2 (0.005
M). Kinetic parameters were also calculated
Quantum effects in thermal reaction rates at metal surfaces
No full textThere is wide interest in developing accurate theories for predicting rates of chemical reactions that occur at metal surfaces, especially for applications in industrial catalysis. Conventional methods contain many approximations that lack experimental validation. In practice, there are few reactions where sufficiently accurate experimental data exist to even allow meaningful comparisons to theory. Here, we present experimentally derived thermal rate constants for hydrogen atom recombination on platinum single-crystal surfaces, which are accurate enough to test established theoretical approximations. A quantum rate model is also presented, making possible a direct evaluation of the accuracy of commonly used approximations to adsorbate entropy. We find that neglecting the wave nature of adsorbed hydrogen atoms and their electronic spin degeneracy leads to a 10× to 1000× overestimation of the rate constant for temperatures relevant to heterogeneous catalysis. These quantum effects are also found to be important for nanoparticle catalysts.Making surface chemistry more exact
Accurate description of elementary steps of chemical reactions at surfaces is a long-standing challenge because of the lack of reliable experimental measurements of the corresponding rate constants, which also makes it impossible to rigorously validate theoretical estimates. Even for reactions as simple as thermal recombination of hydrogen atoms on platinum surfaces, previous experimental rate constants have only been obtained with large uncertainties. Using velocity-resolved kinetics and ion imaging–based calibration of absolute molecular beam fluxes, Borodin
et al
. managed to overcome established experimental difficulties and report unprecedentedly accurate rate constants for this reaction over a wide temperature range. They also demonstrate a parameter-free model that quantitatively reproduces the experiment, opening up new vistas for the growing field of computational heterogeneous catalysis. —YSSurface reaction rate constants were measured accurately so that a meaningful comparison with theory can now be made
Leonid Borodin in search of the third truth
No full textThe article is devoted to the semantic structure and poetics of Leonid Borodin’s Novella The
Third Truth. The author attempts a holistic reading of the work through the use of current methods of mythopoetic analysis. Attention is focused on the meaning of the name, on key artistic
concepts and character series Riabinin — Selivanov — Obolenskie. The artistic concept
of taiga, which is ontologically important for Siberian writers and makes it possible to convey
a characteristic attitude towards the world, is called the basic idea. Borodin managed to fix the
approaching end of the heroic stage of national history in the relationships of key characters;
he managed to show in Selivanov’s fate the reflection of the tragedy of the new, “urban” reality,
which suppresses national-historical instincts, deforming the axiological foundations of
existence. The author believes that the most important thing for a writer in the tragic fates of
Riabinin, Selivanov, Obolenskii is the denial of the possibility of finding a man in new social
and historical conditions, the degree of freedom, which gives the “son of heaven and earth”
the possibility to build life in accordance with the “third”, namely, the real and only truth,
implying a combination of “God’s will, the beginning of natural-space and natural-historical
principles” (Iurii Davydov). None of the heroes of The Third Truth are able to overcome civilizational
pressure. The way out of the civilizational conflict is seen only in the choice of the
author’s life strategy, which is determined by the understanding of truth as an ethical choice
in favor of justice
On the origin of crossover interference : a chromosome oscillatory movement (COM) model
No full textBackground: It is now nearly a century since it was first discovered that crossovers between homologous parental
chromosomes, originating at the Prophase stage of Meiosis I, are not randomly placed. In fact, the number and
distribution of crossovers are strictly regulated with crossovers/chiasmata formed in optimal positions along the
length of individual chromosomes, facilitating regular chromosome segregation at the first meiotic division. In spite
of much research addressing this question, the underlying mechanism(s) for the phenomenon called crossover/
chiasma interference is/are still unknown; and this constitutes an outstanding biological enigma.
Results: The Chromosome Oscillatory Movement (COM) model for crossover/chiasma interference implies that,
during Prophase of Meiosis I, oscillatory movements of the telomeres (attached to the nuclear membrane) and the
kinetochores (within the centromeres) create waves along the length of chromosome pairs (bivalents) so that
crossing-over and chiasma formation is facilitated by the proximity of parental homologs induced at the nodal
regions of the waves thus created. This model adequately explains the salient features of crossover/chiasma
interference, where (1) there is normally at least one crossover/chiasma per bivalent, (2) the number is correlated
to bivalent length, (3) the positions are dependent on the number per bivalent, (4) interference distances are on
average longer over the centromere than along chromosome arms, and (5) there are significant changes in carriers
of structural chromosome rearrangements.
Conclusions: The crossover/chiasma frequency distribution in humans and mice with normal karyotypes as well as
in carriers of structural chromosome rearrangements are those expected on the COM model. Further studies are
underway to analyze mechanical/mathematical aspects of this model for the origin of crossover/chiasma
interference, using string replicas of the homologous chromosomes at the Prophase stage of Meiosis I. The
parameters to vary in this type of experiment will include: (1) the mitotic karyotype, i.e. ranked length and
centromere index of the chromosomes involved, (2) the specific bivalent/multivalent length and flexibility,
dependent on the way this structure is positioned within the nucleus and the size of the respective meiocyte
nuclei, (3) the frequency characteristics of the oscillatory movements at respectively the telomeres and the
kinetochores
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