82 research outputs found
On the T-Odd Quark Fragmentation Function and on Transversal Handedness
The first probe of the correlation of the T-odd one-particle fragmentation
function responsible for the left--right asymmetry of fragmentation of a
transversely polarized quark is done by using the 1991-95 DELPHI data for -jet decay. Integrated over the fraction of longitudinal and transversal
momenta, this correlation is of 1.5% order, which means order of 13% for the
analyzing power.
A rather large () handedness transversal to the production plane
was observed in the diffractive production of () triples from
nuclei by the --beam. It was shown that the phenomenon has a
clear dynamic origin and resembles the single spin asymmetry behavior. All this
makes us hope to use this effects in polarized DIS experiments for transversity
measurement.Comment: 10 pp, 5 epsfig, Latex 2e, szjp.cls, epsfig.sty, wrapfig.sty
included. Talk in "Spin and Symmetry - Praha98". To be published in
Czechoslovak Journal of Physics, Supp
Study of correlation of production and decay planes in diffractive dissociation process on nuclei
A large correlation of production and decay planes of
(\pi^-\pi^+\pi^-)-system in dissociation of -beam 40 GeV/c on nuclear
targets was observed. The dependence of the correlation on atomic number,
Feynmann variable and transversal momentum as well as on invariant mass of the
pion triple and neutral pion pair were investigated. It was shown that the
phenomenon has a clear dynamic origin and resembles the single spin asymmetry
behavior.Comment: 8 pages, latex epsfig.sty, 5 eps figures. Submitted to Yad. Fiz
Theory of weak continuous measurements in a strongly driven quantum bit
Continuous spectroscopic measurements of a strongly driven superconducting
qubit by means of a high-quality tank circuit (a linear detector) are under
study. Output functions of the detector, namely, a spectrum of voltage
fluctuations and an impedance, are expressed in terms of the qubit spectrum and
magnetic susceptibility. The nonequilibrium spectrum of the current
fluctuations in the qubit loop and the linear response function of the driven
qubit coupled to a heat bath are calculated with Bloch-Redfield and rotating
wave approximations. Backaction effects of the qubit on the tank and the tank
on the qubit are analyzed quantitatively. We show that the voltage spectrum of
the tank provides detailed information about a frequency and a decay rate of
Rabi oscillations in the qubit. It is found that both an efficiency of
spectroscopic measurement and measurement-induced decoherence of the qubit
demonstrate a resonant behaviour as the Rabi frequency approaches the resonant
frequency of the tank. We determine conditions when the spectroscopic
observation of the Rabi oscillations in the flux qubit with the tank circuit
can be considered as a weak continuous quantum measurement.Comment: 28 page
Supernovae - Optical Precursors of Short Gamma-Ray Bursts
The probability of observing "supernova - gamma-ray burst" (GRB) pair events
and recurrent GRBs from one galaxy in a time interval of several years has been
estimated. Supernova explosions in binary systems accompanied by the formation
of a short-lived pair of compact objects can be the sources of such events. If
a short GRB is generated during the collision of a pair, then approximately
each of ~300 short GRBs with redshift z must have an optical precursor - a
supernova in the observer's time interval <2(1+z)yr. If the supernova explosion
has the pattern of a hypernova, then a successive observation of long and short
GRBs is possible. The scenario for the generation of multiple GRBs in
collapsing galactic nuclei is also discussed.Comment: 12 pages, 1 figure; this paper has the e-precursor arXiv:1101.3298
[astro-ph.HE
Algbrodynamics over complex space and phase extension of the Minkowski geometry
First principles should predetermine physical geometry and dynamics both
together. In the "algebrodynamics" they follow solely from the properties of
the biquaternion algebra \B and the analysis over \B. We briefly present
the algebrodynamics on the Minkowski background based on a nonlinear
generalization to \B of the Cauchi-Riemann analyticity conditions. Further,
we consider the effective real geometry uniquely resulting from the structure
of multiplication in \B which turns out to be of the Minkowski type, with an
additional phase invariant. Then we pass to study the primordial dynamics that
takes place in the complex \B space and brings into consideration a number of
remarkable structures: an ensemble of identical correlated matter pre-elements
("duplicons"), caustic-like signals (interaction carriers), a concept of random
complex time resulting in irreversibility of physical time at a macrolevel,
etc. In partucular, the concept of "dimerous electron" naturally arises in the
framework of complex algebrodynamics and, together with the above-mentioned
phase invariant, allows for a novel approach to explanation of quantum
interference phenomena alternative to the recently accepted paradigm of
wave-particle dualism.Comment: 14 pages, twocolum
Сравнение экспрессии гена РСА3 в осадках и экзосомах мочи при раке предстательной железы
Introduction. Prostate cancer (PCa) is one of the common oncological diseases in men. Expression of the PCA3 gene in urine is currently used as a molecular genetic marker of PCa.Objective: to comparative analysis of the PCA3 expression in urine sediments and exosomes for the determination of the biomaterial, which allows detecting the PCA3 expression in more efficient manner.Materials and methods. The 12 patients with different stages of PCa and 8 control samples were examined.Results. The diagnostic accuracy of the PCA3 gene expression analysis in this cohort exceeded 90 %. We had not obtained significant differences in the sensitivity and specificity of the PCA3 hyperexpression in the urine sediments compared with exosomes. This result indicates in favor to using urine sediment for the PCA3 analysis as a biomaterial with less time-consuming sample preparation, although the possible advantage of exosomes for the analysis of the expression marker panels requires further studies.Введение. Рак предстательной железы (РПЖ) является одним из наиболее частых онкологических заболеваний у мужчин. В качестве молекулярно-генетического маркера РПЖ в настоящее время используют определение экспрессии гена РСА3 в моче.Цель работы – сравнительный анализ экспрессии гена РСА3 в осадках и в экзосомах мочи для определения биоматериала, позволяющего более эффективно проводить определение экспрессии этого гена.Материалы и методы. Были исследованы данные 12 пациентов с различными стадиями РПЖ и 8 контрольных образцов.Результаты. Диагностическая точность анализа экспрессии РСА3 в этой выборке превысила 90 %. Не выявлено достоверных различий чувствительности и специфичности гиперэкспрессии РСА3 при анализе осадков по сравнению с экзосомами мочи. Это указывает на целесообразность использования осадков мочи для анализа РСА3 как биоматериала с менее трудоемкой пробоподготовкой, однако возможные преимущества экзосом для анализа панелей экспрессионных маркеров требуют дальнейшего изучения
Герминальные нонсенс-мутации в гене SMARCB1 у российских пациентов с рабдоидными опухолями почек
The malignant rhabdoid tumor (RT) is one of the most aggressive childhood neoplasm. RTs are characterized by the presence of inactivating mutations in the SMARCB1 (hSNF5/INI1/BAF47) gene – a tumor suppressor localized in 22q11.2. Up to 30 % of RTs caused by germline mutations of this gene, to date those cases are considered as a manifestation of the rhabdoid tumor predisposition syndrome type 1 (RTPS1). We have analyzed the SMARCB1 mutations by polymerase chain reaction and subsequent Sanger sequencing in 18 patients with RT in different localizations for improving of genetic laboratory diagnostics of the RTPS1, as well as searching of genotype-phenotype correlations in this disease. Three patients had de novo nonsense-mutations c.157C→T (p.R53*), c.669_670del (p.C223*) and c.843G→A (p.W281*), confirming RTPS1, which were associated with RT in the kidney, early age at diagnosis (median 2.6 months) and poor prognosis. Identification of germline SMARCB1 mutations in the patients with RTs is essential to assess the risk of metachronous tumors and for genetic counseling of other family members.Злокачественные рабдоидные опухоли (ЗРО) относятся к одним из наиболее агрессивно протекающих новообразований раннего детского возраста. Для их развития характерно наличие инактивирующей мутации гена SMARCB1 (hSNF5/INI1/BAF47), супрессора опухолевого роста, локализованного в локусе 22q11.2. До 30% случаев заболевания обусловлено наличием герминальных мутаций этого гена, что на сегодняшний день расценивается как проявление синдрома предрасположенности к развитию рабдоидных опухолей I типа (RTPS1). С целью определения мутаций гена SMARCB1 в рамках совершенствования генетической лабораторной диагностики RTPS1, а также оценки соотношения гено-фенотипических корреляций при данном заболевании, нами было проведено исследование кодирующей части гена SMARCB1 с помощью ПЦР и последующего секвенирования у 18 пациентов с ЗРО различной локализации. У трех пациентов был подтвержден RTPS1 и найдены de novo нонсенс-мутации c.157C→T (p.R53*), с.669_670del (p.C223*) и c.843G→A (p.W281*), что ассоциировалось с ЗРО почек, ранним возрастом на момент постановки диагноза (медиана 2,6 мес) и дальнейшим неблагоприятным прогнозом заболевания. Выявление герминальных мутаций SMARCB1 у пациентов со ЗРО имеет важное значение для оценки рисков развития метахронных опухолей и медико-генетического консультирования членов семьи
Structure of the intramolecular condensation products of N,N?-disubstituted phosphorylated iminoureas
Reaction of sodium salt of 6-m ethyl-2-methylthio-4-hydroxypyrimidine with chloroacetone
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