Omega_{ccc} production via fragmentation at LHC

In the framework of the leading order of perturbative QCD and the nonrelativistic quark-diquark model of baryons we have obtained fragmentation function for c-quark to split into Omega_{ccc} baryon. It is shown that at LHC one can expect 3.5 10^3 events with Omega_{ccc} at p_t>5 GeV/c and -1<y<1 per year.Comment: LaTex, 5 pages and 2 figures. Talk presented at XIV Workshop on High Energy Physics and Quantum Field Theory, Moscow, May 27 - June 4, 199

Interaction effects on magnetooscillations in a two-dimensional electron gas

Motivated by recent experiments, we study the interaction corrections to the damping of magnetooscillations in a two-dimensional electron gas (2DEG). We identify leading contributions to the interaction-induced damping which are induced by corrections to the effective mass and quantum scattering time. The damping factor is calculated for Coulomb and short-range interaction in the whole range of temperatures, from the ballistic to the diffusive regime. It is shown that the dominant effect is that of the renormalization of the effective electron mass due to the interplay of the interaction and impurity scattering. The results are relevant to the analysis of experiments on magnetooscillations (in particular, for extracting the value of the effective mass) and are expected to be useful for understanding the physics of a high-mobility 2DEG near the apparent metal-insulator transition.Comment: 24 pages; subsection adde

Изучение влияния аланина на накопление фенольных соединений в листьях цикория обыкновенного (Cichorium intybus L.)

Common chicory (Cichorium intybus L.) is a promising source of raw materials for both food (roots) and pharmaceutical industries (leaves). One of the ways to increase the biologically active compounds content in medicinal plant materials is the use of various growth stimulants, which include amino acids. The article presents the results of an experimental study conducted in 2021-2022 which study the effect of of L-alanine and a racemic mixture of alanine (DL) on the accumulation and qualitative composition of phenolic compounds (PC) in the leaves of chicory.Results. It was found that the use of alanine in different concentrations did not have a significant effect on the increase of phenolic compounds content, and also did not affect the on their accumulation dynamics. The use of alanine enantiomers did not affect the qualitative composition of phenolic compounds, but led to a change in the ratio of hydroxycinnamic acids to each other. It has been established that during the growing season the percentage ratio between the main phenolic compounds in chicory leaves changes - the content of chlorogenic acid increases in proportion to the decrease in chicory acid. Treatment with L-alanine at a concentration of 25 mg/l during the study period in both varieties led to the largest reduction in the content of chicory acid compared to others. It was noted that the total content of PC is higher in a year with warmer and more arid weather, it was higher on average by 0,7 %.Цикорий обыкновенный (Cichorium intybus L.) является перспективным источником получения сырья для нужд как пищевой (корни), так и фармацевтической промышленности (листья). Одним из способов увеличения содержания биологически активных соединений в лекарственном растительном сырье является использование различных стимуляторов роста, к которым относятся аминокислоты. В статье приведены результаты экспериментального исследования, проводившегося в 2021-2022 годов по изучению действия раствора L-аланина и рацемической смеси аланина (DL) на накопление и качественный состав фенольных соединений (ФС) в листьях цикория обыкновенного.Было установлено, что применение аланина в разных концентрациях не оказало значительного влияния на увеличение содержания фенольных соединений, а также не повлияло на динамику их накопления. Применение растворов энантиомеров аланина не повлияло на качественный состав фенольных соединений, но привело к изменению соотношения гидроксикоричных кислот между собой. Установлено, что в течение вегетационного периода в листьях цикория изменяется процентное соотношение между основными фенольными соединениями – содержание хлорогеновой кислоты увеличивается пропорционально снижению цикориевой кислоты. Обработка L-аланином в концентрации 25 мг/л за период исследования на обоих сортах привела к наибольшему снижению содержания цикориевой кислоты по сравнению с другими вариантами. Отмечено, что общее содержание ФС выше в год с более теплой и засушливой погодой – в среднем на 0,7 %

Epizootic Activity of Natural Plague Foci in the Territory of the Russian Federation in 2011, and Prognosis for 2012

Carried out is the assessment of epizootic activity of natural plague foci in the Russian Federation and in the Republic of Kazakhstan during the period of 2000-2010. It is specified that 38 plague microbe strains have been isolated in the territory of the Russian Federation, the total area of epizooties being 882,5 km2. Plague microbe strains are isolated in the territory of East-Caucasian high-mountain and Altai mountain natural foci. Identified are the reasons of low epizootic activity of plain and low-mountain natural plague foci in the Russian Federation. Outlined is the role of climatic factors in the development of current intense depression in numbers of carriers and vectors of plague. Put forward is the prognosis on the low epizootic activity of the natural plague foci in the Russian Federation in 2012. It is substantiated that the emergence of local epizooties in 2012 is to take place in the territory of Altai mountain, Tuvin mountain and East-Caucasian high-mountain natural plague foci

Методика одновременного определения карбамазепина и карбамазепин-10,11-эпоксида методом ВЭЖХ-МС/МС

Carbamazepine is the drug of first choice in the treatment of trigeminal neuralgia, epilepsy and other neurological diseases. Carbamazepine is known to have a narrow therapeutic range, and hereby the auto-induction of its metabolism with prolonged use cause the reduction of its therapeutic efficacy. Phenotyping of patients by the rate of carbamazepine metabolism allows to perform individual drug dose adjustment and to avoid the occurrence of adverse drug effects. In order to implement the mentioned approach, the method for simultaneous determination of carbamazepine and carbamazepine-10,11-epoxide in human serum using HPLC-MS/MS was developed.Карбамазепин является препаратом первого выбора при лечении невралгии тройничного нерва, эпилепсии и других неврологических заболеваний. Известно, что карбамазепин имеет узкий терапевтический диапазон, при этом на фоне постоянного приема наблюдается автоиндукция его метаболизма и снижение эффективности препарата. Фенотипирование больных по скорости метаболизма карбамазепина позволяет провести индивидуальный подбор дозы препарата и избежать проявления нежелательных лекарственных явлений. Для реализации данного подхода разработана методика одновременного определения карбамазепина и карбамазепин-10,11-эпоксида(СBZ-Б) в сыворотке крови человека с использованием метода высокоэффективной жидкостной хроматографии с тандемным масс-спектрометрическим детектированием (ВЭЖХ-МС/МС)

Strange particle production in proton-proton collisions at s=0.9\sqrt{s}=0.9 TeV with ALICE at the LHC

The production of mesons containing strange quarks (K$^0_s$, $\phi$) and both singly and doubly strange baryons ($\Lambda$, Anti-$\Lambda$, and $\Xi$+Anti-$\Xi$) are measured at central rapidity in pp collisions at $\sqrt{s}$ = 0.9 TeV with the ALICE experiment at the LHC. The results are obtained from the analysis of about 250 k minimum bias events recorded in 2009. Measurements of yields (dN/dy) and transverse momentum spectra at central rapidities for inelastic pp collisions are presented. For mesons, we report yields () of 0.184 $\pm$ 0.002 stat. $\pm$ 0.006 syst. for K$^0_s$ and 0.021 $\pm$ 0.004 stat. $\pm$ 0.003 syst. for $\phi$. For baryons, we find = 0.048 $\pm$ 0.001 stat. $\pm$ 0.004 syst. for $\Lambda$, 0.047 $\pm$ 0.002 stat. $\pm$ 0.005 syst. for Anti-$\Lambda$ and 0.0101 $\pm$ 0.0020 stat. $\pm$ 0.0009 syst. for $\Xi$+Anti-$\Xi$. The results are also compared with predictions for identified particle spectra from QCD-inspired models and provide a baseline for comparisons with both future pp measurements at higher energies and heavy-ion collisions.Comment: 33 pages, 21 captioned figures, 10 tables, authors from page 28, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/387

Two-pion Bose-Einstein correlations in central Pb-Pb collisions at sNN\sqrt{s_{\rm NN}} = 2.76 TeV

The first measurement of two-pion Bose-Einstein correlations in central Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV at the Large Hadron Collider is presented. We observe a growing trend with energy now not only for the longitudinal and the outward but also for the sideward pion source radius. The pion homogeneity volume and the decoupling time are significantly larger than those measured at RHIC.Comment: 17 pages, 5 captioned figures, 1 table, authors from page 12, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/388

Suppression of charged particle production at large transverse momentum in central Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm NN}} = 2.76 TeV

Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0-5% and 70-80% of the hadronic Pb-Pb cross section. The measured charged particle spectra in $|\eta|<0.8$ and $0.3 < p_T < 20$ GeV/$c$ are compared to the expectation in pp collisions at the same $\sqrt{s_{\rm NN}}$, scaled by the number of underlying nucleon-nucleon collisions. The comparison is expressed in terms of the nuclear modification factor $R_{\rm AA}$. The result indicates only weak medium effects ($R_{\rm AA} \approx$ 0.7) in peripheral collisions. In central collisions, $R_{\rm AA}$ reaches a minimum of about 0.14 at $p_{\rm T}=6$-7GeV/$c$ and increases significantly at larger $p_{\rm T}$. The measured suppression of high-$p_{\rm T}$ particles is stronger than that observed at lower collision energies, indicating that a very dense medium is formed in central Pb-Pb collisions at the LHC.Comment: 15 pages, 5 captioned figures, 3 tables, authors from page 10, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/98