Identification of species in the genus Nitraria L. (Nitrariaceae) based on nucleotide variability of nuclear ribosomal DNA

Intragenomic polymorphism of ITS1 and ITS2 of nuclear ribosomal DNA sequences was analysed in 33 samples belonging to the Nitraria species N. schoberi, N. sibirica, and N. komarovii. The nucleotide variability of the ITS region was detected in the Nitraria species as single-nucleotide substitutions (mainly transitions) and single-nucleotide deletion. Information about the nucleotide variability of fragments is given for the first time by us. The ITS1-5.8S-ITS2 region contained 17 phylogenetically informative single-nucleotide polymorphisms. Eleven single-nucleotide substitutions (transitions, C/T) were detected in ITS1. The ITS2 spacer contained 273–274 bp and was more conservative. A total of 5 phylogenetically informative single-nucleotide polymorphisms (4 transitions: C/T, G/A, one transversion: G/C), one single-nucleotide deletion (T/–) were detected in ITS2. The average GC content was 61.5 %. The GC content was lower in N. sibirica (59.2 %) than in N. schoberi and N. komarovii (62.7 %). It has been shown that the shorter ITS2 is a suitable molecular marker separating these species, due to the low interspecific variability and simultaneous available intraspecific variability. Phylogenetic ML and BI trees constructed separately for the ITS1 and ITS2 spacers, as well as separately for the full-size ITS region and the ITS2 spacer, were congruent. The results obtained on the intraspecific differentiation of N. sibirica revealed two main ribotypes among the samples of this species: the main Siberian sibirica-ribotype and the main Kazakh sibiricaribotype. Geographical features of the distribution of N. sibirica ribotypes, as well as the presence of significant differences between the main Siberian and Kazakh sibirica-ribotypes (3 single-nucleotide substitutions) indicated significant inter-population differences and taxonomic heterogeneity of N. sibirica. Most likely, the processes of homogenization of nuclear ribosomal DNA of N. sibirica samples, the origin of which is associated with hybridization and speciation, are currently continuing

Assessment of genetic diversity of some Siberian and Far Eastern species of the genus Spiraea (Rosaceae) by newly developed multiplex panels of nuclear SSR loci

Taxonomic and population genetic studies of the genus Spiraea (Rosaceae) species require new informative genetic markers. We screened 37 previously published heterologous oligonucleotide primer pairs for nuclear microsatellite loci and selected eight polymorphic and most reproducible of them for PCR multiplexing which substantially increases performance of routine mass genotyping. Three multiplex sets of 3, 3 and 2 loci, respectively, were developed and tested for ability to estimate the parameters of genetic variability and  population  structure in closely related species Spiraea ussuriensis, S. f lexuosa, S. chamaedryfolia representing seven natural populations of the Russian Far East and Siberia. Allele number ranged among loci from twelve (Spth20) to three. Among 41 alleles found, 7 were unique in some species/populations. Analysis of parameters of genetic variability in Spiraea spp. showed similar values of allele number per locus and observed heterozygosity among populations and slightly greater estimates of expected hete rozygosity in the samples of S. f lexuosa (NA = 2.387; HO = 0.387 ± ± 0.052; HE = 0.540 ± 0.055) as compared to S. ussuriensis (NA = = 2.781; HO = 0.385 ± 0.079; HE = 0.453 ± 0.072) and S. chamaedryfolia (NA = 2.875; HO = 0.331 ± 0.071; HE = 0.505 ± 0.069). The observed values of genetic polymorphism parameters indicate the average level of genetic diversity of the studied species typical to previous studies in Spiraea. About 19 % of the observed variability occurred among populations (FST = 0.191) while 81 % of the total genetic variation concentrated within the populations. The loci VS11, VS12, VS2, and VS6 contributed most to the observed differentiation. Nei genetic distances  between populations ranged from 0.049 to 0.585. Genetic differentiation patterns among studied populations based on allele frequencies of nuclear microsatellite loci correspond with their geographical location. Genetic composition of some samples contradicted with their provisional species identification

Профессионально важные качества специалиста как составная его проектной культуры

У статті аналізується категорія «проектна культура», що дозволяє визначити місце професійно важливих якостей в загальній характеристиці особистості фахівця. Розкрито сутність і структура професійно важливих якостей. Наведено рекомендації щодо формування професійно важливих якостей на прикладі підготовки майбутніх інженерів-педагогів комп’ютерного профілю.Assay of the category “designed culture”, witch was carried out, allowed to determine place of the professionally important qualities in the general characteristic of specialist’s personality. The essence and structure of the professionally important qualities are found out. Recommendations to form professionally important qualities by the example of training of the future engineer-pedagogues of the computer profile are brought.Проведенный анализ категории «проектная культура» позволил определить место профессионально значимых качеств в общей характеристике личности специалиста. Раскрыта сущность и структура профессионально значимых качеств. Приведены рекомендации по формированию профессионально важных качеств на примере подготовки будущих инженеров-педагогов компьютерного профиля

Observation of an Excited Bc+ State

Using pp collision data corresponding to an integrated luminosity of 8.5 fb-1 recorded by the LHCb experiment at center-of-mass energies of s=7, 8, and 13 TeV, the observation of an excited Bc+ state in the Bc+π+π- invariant-mass spectrum is reported. The observed peak has a mass of 6841.2±0.6(stat)±0.1(syst)±0.8(Bc+) MeV/c2, where the last uncertainty is due to the limited knowledge of the Bc+ mass. It is consistent with expectations of the Bc∗(2S31)+ state reconstructed without the low-energy photon from the Bc∗(1S31)+→Bc+γ decay following Bc∗(2S31)+→Bc∗(1S31)+π+π-. A second state is seen with a global (local) statistical significance of 2.2σ (3.2σ) and a mass of 6872.1±1.3(stat)±0.1(syst)±0.8(Bc+) MeV/c2, and is consistent with the Bc(2S10)+ state. These mass measurements are the most precise to date

Особенности клинического течения гипертрофической кардиомиопатии в зависимости от фактора наследственности

The objective was to study the clinical features of symptomatic hypertrophic cardiomyopathy (HCM) depending on the form (familial / non-familial), the age of onset and the presence of arterial hypertension (AH).Methods and materials. During 6 years, we examined 250 HCM patients, 100 patients with symptomatic HCM aged from 18 to 86 years were included in the study. Results. Patients with the clinical manifestations onset at a young age more often had a familial form of the disease, an autosomal dominant type of inheritance, an asymmetric HCM with reverse curve interventricular septal morphology. On the contrary, patients with the clinical manifestations onset at the age of ≥45 years had non-familial form of the disease and asymmetric HCM with basal interventricular septal hypertrophy. The young HCM patients with associated AH more often were obese, had CHF of III–IV functional class (NYHA), larger anteroposterior left atrial diameter than patients without AH and more often needed interventricular septal reduction. HCM patients and associated AH with the disease onset at the age of ≥45 years significantly more often had angina syndrome. Absolute indications for interventricular septal reduction in HCM patients with the disease onset ≥45 years of age were determined only for HCM patients and associated AH. At the same time, 50 % of HCM+AH patients both at a young age and in the older group, had obesity. Conclusions. The interventricular septal morphology differs significantly depending on the age of clinical manifestations onset. Co-existing AH and obesity are predictors of the progressive HCM course and an increase in the proportion of patients with absolute indications for interventricular septal reductions regardless of the age of clinical manifestations onset.Цель – изучить особенности течения симптомной гипертрофической кардиомиопатии (ГКМП) в зависимости от формы (семейная/несемейная), возраста дебюта клинических проявлений и наличия артериальной гипертензии (АГ). Методы и материалы. В течение 6 лет обследовано 250 пациентов, в исследование включено 100 пациентов с симптомным течением ГКМП в возрасте от 18 до 86 лет. Результаты. При дебюте клинических проявлений в молодом возрасте чаще диагностирована семейная форма заболевания, аутосомно-доминантный тип наследования, асимметричная ГКМП с морфологией МЖП по типу двояковыпуклой. Напротив, при дебюте в возрасте 45 лет и старше чаще выявлена несемейная форма заболевания и асимметричная ГКМП с морфологией МЖП по типу максимально выраженной гипертрофии в базальной части МЖП. Пациенты с ГКМП и сопутствующей АГ молодого возраста чаще имели ожирение, ХСН III–IV ФК NYHA, больший передне-задний размер ЛП по сравнению с пациентами без АГ и чаще нуждались в редукции МЖП. Пациенты с ГКМП и сопутствующей АГ с дебютом заболевания в возрасте 45 лет и старше значимо чаще имели синдром стенокардии. Абсолютные показания к редукции МЖП с дебютом ГКМП в возрасте 45 лет и старше определены только у пациентов с сопутствующей АГ. При этом 50 % пациентов с ГКМП+АГ как в молодом возрасте, так и в старшей группе, имели ожирение. Заключение. Паттерн морфологии МЖП имеет значимые отличия в зависимости от возраста дебюта клинических проявлений. Сосуществующие с ГКМП артериальная гипертензия и ожирение являются предикторами прогрессирующего течения ГКМП и увеличения доли пациентов с абсолютными показаниями к редукции МЖП независимо от возраста дебюта клинических проявлений

Observation of the Decay Λ0b→Λ+cτ−¯ν

The first observation of the semileptonic b-baryon decay Λb0→Λc+τ-ν¯τ, with a significance of 6.1σ, is reported using a data sample corresponding to 3 fb-1 of integrated luminosity, collected by the LHCb experiment at center-of-mass energies of 7 and 8 TeV at the LHC. The τ- lepton is reconstructed in the hadronic decay to three charged pions. The ratio K=B(Λb0→Λc+τ-ν¯τ)/B(Λb0→Λc+π-π+π-) is measured to be 2.46±0.27±0.40, where the first uncertainty is statistical and the second systematic. The branching fraction B(Λb0→Λc+τ-ν¯τ)=(1.50±0.16±0.25±0.23)% is obtained, where the third uncertainty is from the external branching fraction of the normalization channel Λb0→Λc+π-π+π-. The ratio of semileptonic branching fractions R(Λc+)B(Λb0→Λc+τ-ν¯τ)/B(Λb0→Λc+μ-ν¯μ) is derived to be 0.242±0.026±0.040±0.059, where the external branching fraction uncertainty from the channel Λb0→Λc+μ-ν¯μ contributes to the last term. This result is in agreement with the standard model prediction

Observation of Two New Excited Ξb0 States Decaying to Λb0 K-π+

Two narrow resonant states are observed in the Λb0K-π+ mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 6 fb-1. The minimal quark content of the Λb0K-π+ system indicates that these are excited Ξb0 baryons. The masses of the Ξb(6327)0 and Ξb(6333)0 states are m[Ξb(6327)0]=6327.28-0.21+0.23±0.12±0.24 and m[Ξb(6333)0]=6332.69-0.18+0.17±0.03±0.22 MeV, respectively, with a mass splitting of Δm=5.41-0.27+0.26±0.12 MeV, where the uncertainties are statistical, systematic, and due to the Λb0 mass measurement. The measured natural widths of these states are consistent with zero, with upper limits of Γ[Ξb(6327)0]<2.20(2.56) and Γ[Ξb(6333)0]<1.60(1.92) MeV at a 90% (95%) credibility level. The significance of the two-peak hypothesis is larger than nine (five) Gaussian standard deviations compared to the no-peak (one-peak) hypothesis. The masses, widths, and resonant structure of the new states are in good agreement with the expectations for a doublet of 1D Ξb0 resonances

Measurement of the photon polarization in Λb→Λγ\Lambda_b \to \Lambda \gamma decays

The photon polarization in $b \to s \gamma$ transitions is measured for the first time in radiative b-baryon decays exploiting the unique spin structure of $\Lambda_b \to \Lambda \gamma$ decays. A data sample corresponding to an integrated luminosity of $6\;fb^{-1}$ collected by the LHCb experiment in $pp$ collisions at a center-of-mass energy of $13\;TeV$ is used. The photon polarization is measured to be $\alpha_{\gamma}= 0.82^{\,+\,0.17\,+\,0.04}_{\,-\,0.26\,-\,0.13}$, where the first uncertainty is statistical and the second systematic. This result is in agreement with the Standard Model prediction and previous measurements in b-meson decays. Charge-parity breaking effects are studied for the first time in this observable and found to be consistent with $CP$ symmetry.Comment: All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-030.html (LHCb public pages

Observation of the doubly charmed baryon decay Ξcc++→Ξc′+π+

The Ξcc++→Ξc′+π+ decay is observed using proton-proton collisions collected by the LHCb experiment at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1. The Ξcc++→Ξc′+π+ decay is reconstructed partially, where the photon from the Ξc′+→Ξc+γ decay is not reconstructed and the pK−π+ final state of the Ξc+ baryon is employed. The Ξcc++→Ξc′+π+branching fraction relative to that of the Ξcc++→Ξc+π+ decay is measured to be 1.41 ± 0.17 ± 0.10, where the first uncertainty is statistical and the second systematic. [Figure not available: see fulltext.

Searches for rare Bs0 and B 0 decays into four muons

Searches for rare Bs0 and B0 decays into four muons are performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1. Direct decays and decays via light scalar and J/ψ resonances are considered. No evidence for the six decays searched for is found and upper limits at the 95% confidence level on their branching fractions ranging between 1.8 × 10−10 and 2.6 × 10−9 are set. [Figure not available: see fulltext.