187 research outputs found
NEW RECORDS FOR THE FAUNA AND ZOOGEOGRAPHY OF CUCKOO WASPS (HYMENOPTERA: CHRYSIDIDAE) IN THE LOWER VOLGA REGION
The fauna and zoogeography of chrysidids in the steppe and forest biocenoses of the Lower Volga region in the Saratov region were studied, which include 92 species and 2 subspecies from 17 genera: Cleptes – 2 species; Colpopyga – 1; Elampus – 8; Haba – 1; Hedychridium – 6; Hedychrum – 5; Holopyga – 11; Omalus – 2; Philoctetes – 3; Pseudomalus – 5; Chrysidea – 1; Chrysis – 41; Chrysura – 3; Spinolia – 1; Stilbum – 2; Trichrysis – 1 and Parnopes – 1, among which 69 species are presented for the Saratov region for the first time. Two species, Chrysis corusca Valkeila, 1971 and Chrysis vanlithi Linsenmaier, 1959, and one subspecies Chrysis frivaldszkyi sparsepunctata du Buysson, 1895, are new records for the Russian fauna. The obtained data broaden the understanding of the fauna and diversity of Chrysididae in the Saratov region and the Lower Volga region and supplement the fauna list of the Chrysididae of Russian fauna
Possible Method for Measuring the Proton Form Factors in Processes with and without Proton Spin Flip
The ratio of the squares of the electric and magnetic proton form factors is
shown to be proportional to the ratio of the cross sections for the elastic
scattering of an unpolarized electron on a partially polarized proton with and
without proton spin flip. The initial proton at rest should be polarized along
the direction of the motion of the final proton. Similar results are valid for
both radiative scattering and the photoproduction of pairs on a proton in
the Bethe--Heitler kinematics. When the initial proton is fully polarized in
the direction of the motion of the final proton, the cross section for the process, as well as for the and processes, without (with) proton spin flip is expressed only in terms of
the square of the electric (magnetic) proton form factor. Such an experiment on
the measurement of the cross sections without and with proton spin flip would
make it possible to acquire new independent data on the behavior of
and , which are necessary for resolving the
contradictions appearing after the experiment of the JLab collaboration on the
measurement of the proton form factors with the method of polarization transfer
from the initial electron to the final proton.Comment: 7 pages, revtex
One-dimensional Model of a Gamma Klystron
A new scheme for amplification of coherent gamma rays is proposed. The key
elements are crystalline undulators - single crystals with periodically bent
crystallographic planes exposed to a high energy beam of charged particles
undergoing channeling inside the crystals. The scheme consists of two such
crystals separated by a vacuum gap. The beam passes the crystals successively.
The particles perform undulator motion inside the crystals following the
periodic shape of the crystallographic planes. Gamma rays passing the crystals
parallel to the beam get amplified due to interaction with the particles inside
the crystals. The term `gamma klystron' is proposed for the scheme because its
operational principles are similar to those of the optical klystron. A more
simple one-crystal scheme is considered as well for the sake of comparison. It
is shown that the gamma ray amplification in the klystron scheme can be reached
at considerably lower particle densities than in the one-crystal scheme,
provided that the gap between the crystals is sufficiently large.Comment: RevTeX4, 22 pages, 4 figure
Broadband optical gain via interference in the free electron laser: principles and proposed realizations
We propose experimentally simplified schemes of an optically dispersive
interface region between two coupled free electron lasers (FELs), aimed at
achieving a much broader gain bandwidth than in a conventional FEL or a
conventional optical klystron composed of two separated FELs. The proposed
schemes can {\it universally} enhance the gain of FELs, regardless of their
design when operated in the short pulsed regime
European Strategy for Particle Physics -- Accelerator R&D Roadmap
The 2020 update of the European Strategy for Particle Physics emphasised the
importance of an intensified and well-coordinated programme of accelerator R&D,
supporting the design and delivery of future particle accelerators in a timely,
affordable and sustainable way. This report sets out a roadmap for European
accelerator R&D for the next five to ten years, covering five topical areas
identified in the Strategy update. The R&D objectives include: improvement of
the performance and cost-performance of magnet and radio-frequency acceleration
systems; investigations of the potential of laser / plasma acceleration and
energy-recovery linac techniques; and development of new concepts for muon
beams and muon colliders. The goal of the roadmap is to document the collective
view of the field on the next steps for the R&D programme, and to provide the
evidence base to support subsequent decisions on prioritisation, resourcing and
implementation.Comment: 270 pages, 58 figures. Editor: N. Mounet. LDG chair: D. Newbold.
Panel chairs: P. V\'edrine (HFM), S. Bousson (RF), R. Assmann (plasma), D.
Schulte (muon), M. Klein (ERL). Panel editors: B. Baudouy (HFM), L. Bottura
(HFM), S. Bousson (RF), G. Burt (RF), R. Assmann (plasma), E. Gschwendtner
(plasma), R. Ischebeck (plasma), C. Rogers (muon), D. Schulte (muon), M.
Klein (ERL
Self-amplified spontaneous emission saturation at the Advanced Photon Source free-electron laser (abstract) (invited)
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Состояние легочной микробиоты у мышей С57bl/6 в модели экспериментального туберкулеза
The objective: to study the changes in the lung microbiota in inbred C57BL/6 mice after aerogenic infection with M. tuberculosis in an experimental tuberculosis model.Subjects and Methods. This study was carried out on 20 female mice of inbred line C57BL/6 weighing 20-22 grams which were infected in a Glas-Col aerosol chamber (USA) with the culture of M. tuberculosis of virulent strain H37Rv at the dose of 400 CFU/lung. Morphological and microbiological assessment of the lungs state was performed before (day 0) (n=5) and 7 (n=5), 30 (n=5) and 60 (n=5) days after the infection. The results obtained were subjected to statistical processing using ANOVA test and Student t-test.Results. 7, 30, and 60 days after aerosol infection with M. tuberculosis against the background of successive morphological and microbiological changes typical of the experimental tuberculosis model, we established an imbalance of bacterial population in the lung microbiota. Before infection with M. tuberculosis, a scanty biotope was recorded with a predominance of lactobacilli –Lactobacillus murinus, Lactobacillus apodeme. 7, 30 and 60 days after infection with M. tuberculosis, consistent changes were recorded, such as increase in the number and diversity of the bacterial population. The most indicative markers of the recorded imbalance were: Streptococcus thoraltensis, Streptococcus acidominiminus, Arthrobacter crystallopoietes, Staphylococcus hominis, Micrococcus luteus.Conclusion. Tuberculosis infection is a significant factor affecting the state of the lung microbiota. With increased duration of the infection with M. tuberculosis, imbalance of the bacterial flora is formed in the lungs of C57BL/6 mice, accompanied by characteristic tissue inflammation and growing mycobacterial load.Цель исследования: изучить динамику изменений в микробиоте легких у инбредных мышей C57BL/6 после аэрогенного инфицирования M. tuberculosis в модели экспериментального туберкулеза.Материалы и методы. Настоящая работа выполнена на 20 самках мышей инбредной линии C57BL/6, массой 20–22 грамм, которые были заражены в аэрозольной камере Glas-Col (США) культурой Мtb вирулентного штамма H37Rv в дозе 400 КОЕ/легкое. Морфологическую и микробиологическую оценку состояния легких проводили до (день 0) (n=5) и через 7 (n=5), 30 (n=5) и 60 (n=5) дней после инфицирования. Полученные результаты подвергали статистической обработке с использованием теста ANOVA и Стьюдент t-теста.Результаты. Через 7, 30 и 60 дней после аэрозольного инфицирования M. tuberculosis, на фоне последовательных морфологических и микробиологических изменений, характерных для модели экспериментального туберкулеза, нами установлен дисбаланс бактериальной флоры в микробиоте легких. До заражения Mtb регистрировали скудный биотоп с преобладанием лактобацилл – Lactobacillus murinus, Lactobacillus apodeme. Через 7, 30 и 60 дней после инфицирования Mtb регистрировали последовательные изменения в виде увеличения количества и разнообразия бактериального сообщества. Наиболее показательными маркерами регистрируемого дисбаланса были: Streptococcus thoraltensis, Streptococcus acidominiminus, Arthrobacter crystallopoietes, Staphylococcus hominis, Micrococcus luteus.Заключение. Туберкулезная инфекция является значимым фактором, воздействующим на состояние микробиоты легких.С увеличением длительности инфицирования Mtb в легких мышей C57BL/6 формируется дисбаланс бактериальной флоры, сопровождающийся характерным тканевым воспалением и нарастанием микобактериальной нагрузки
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