2,084 research outputs found
Trapping Horizons in the Sultana-Dyer Space-Time
The Sultana-Dyer space-time is suggested as a model describing a black hole
embedded in an expanding universe. Recently, in \cite{0705.4012}, its global
structure is analyzed and the trapping horizons are shown. In the paper, by
directly calculating the expansions of the radial null vector fields normal to
the space-like two-spheres foliating the trapping horizons, we find that the
trapping horizon outside the event horizon in the Sultana-Dyer space-time is a
past trapping horizon. Further, we find that the past trapping horizon is an
outer, instantaneously degenerate or inner trapping horizon accordingly when
the radial coordinate is less than, equal to or greater than some value.Comment: no figures, 5 pages; PCAS and key words are adde
Bacterial diversity in the intestine of sea cucumber Stichopus japonicus
The intestinal bacterial diversity of Stichopus japonicus was investigated using 16S ribosomal RNA gene (rDNA) clone library and Polymerase Chain Reaction/Denaturing Gradient Gel Electrophoresis (PCR-DGGE). The clone library yielded a total of 188 clones, and these were sequenced and classified into 106 operational taxonomic units (OTUs) with sequence similarity ranging from 88 to 100%. The coverage of the library was 77.4%, with approximately 88.7% of the sequences affiliated to Proteobacteria. Gammaproteobacteria and Vibrio sp. were the predominant groups in the intestine of S. japonicus. Some bacteria such as Legionella sp., Brachybacterium sp., Streptomyces sp., Propionigenium sp. and Psychrobacter sp were first identified in the intestine of sea cucumber
Novel fungal genera and species associated with the sooty blotch and flyspeck complex on apple in China and the USA
Fungi in the sooty blotch and flyspeck (SBFS) complex cause blemishes on apple and pear fruit that result in economic losses for growers. The SBFS fungi colonise the epicuticular wax layer of pomaceous fruit but do not invade the cuticle. Fungi causing fuliginous and punctate mycelial types on apple are particularly difficult to identify based on morphological criteria because many species in the SBFS complex share the same mycelial phenotypes. We compared the morphology and nuclear ribosomal DNA phylogeny (ITS, LSU) of 11 fungal strains isolated from SBFS blemishes on apple obtained from two provinces in China and five states in the USA. Parsimony analysis, supported by cultural characteristics and morphology in vitro, provided support to delimit the isolates into three novel genera, representing five new species. Phaeothecoidiella, with two species, P. missouriensis and P. illinoisensis, is introduced as a new genus with pigmented endoconidia in the Dothideomycetes. Houjia (Capnodiales) is introduced for H. pomigena and H. yanglingensis. Although morphologically similar to Stanjehughesia (Chaetosphaeriaceae), Houjia is distinct in having solitary conidiogenous cells. Sporidesmajora (Capnodiales), based on S. pennsylvaniensis, is distinguished from Sporidesmium (Sordariomycetes) in having long, multiseptate conidiophores that frequently have a subconical, darkly pigmented apical cell, and very long, multi-euseptate conidia
Ferromagnetic resonance study of sputtered Co|Ni multilayers
We report on room temperature ferromagnetic resonance (FMR) studies of [
Co Ni]N sputtered films, where nm. Two
series of films were investigated: films with same number of CoNi bilayer
repeats (N=12), and samples in which the overall magnetic layer thickness is
kept constant at 3.6 nm (N=1.2/). The FMR measurements were conducted with a
high frequency broadband coplanar waveguide up to 50 GHz using a flip-chip
method. The resonance field and the full width at half maximum were measured as
a function of frequency for the field in-plane and field normal to the plane,
and as a function of angle to the plane for several frequencies. For both sets
of films, we find evidence for the presence of first and second order
anisotropy constants, and . The anisotropy constants are strongly
dependent on the thickness , and to a lesser extent on the total thickness
of the magnetic multilayer. The Land\'e g-factor increases with decreasing
and is practically independent of the multilayer thickness. The magnetic
damping parameter , estimated from the linear dependence of the
linewidth, , on frequency, in the field in-plane geometry,
increases with decreasing . This behaviour is attributed to an enhancement
of spin-orbit interactions with decreasing and in thinner films, to a
spin-pumping contribution to the damping.Comment: 18 pages, 13 figure
AlH3 between 65-110 GPa: implications of electronic band and phonon structures
A first-principles density-functional-theory method has been used to
reinvestigate the mechanical and dynamical stability of the metallic phase of
AlH3 between 65-110 GPa. The electronic properties and phonon dynamics as a
function of pressure are also explored. We find electron-phonon
superconductivity in the cubic Pm-3n structure with critical temperature Tc =
37 K at 70 GPa which decreases rapidly with the increase of pressure. Further
unlike a previously calculated Tc value of 24 K at 110 GPa, we do not find any
superconductivity of significance at this pressure which is consistent with
experimental observation.Comment: 6 pages, 4 figures Keywords: AlH3, Electronic structure, Phonon
dynamics, Superconductivity PACS number(s): 62.50.-p, 63.20.kd, 74.10.+v,
74.20.P
Birman-Wenzl-Murakami Algebra and the Topological Basis
In this paper, we use entangled states to construct 9x9-matrix
representations of Temperley-Lieb algebra (TLA), then a family of 9x9-matrix
representations of Birman-Wenzl-Murakami algebra (BWMA) have been presented.
Based on which, three topological basis states have been found. And we apply
topological basis states to recast nine-dimensional BWMA into its
three-dimensional counterpart. Finally, we find the topological basis states
are spin singlet states in special case.Comment: 11pages, 1 figur
Paclitaxel-octreotide conjugates inhibit growth of human non-small cell lung cancer cells in vitro
Aim: To evaluate the effects of paclitaxel-octreotide conjugates on the growth of cultured non-small cell lung cancer cells. Methods: RT-PCR was performed to detect mRNA for the subtypes of the human somatostatin receptor (SSTR) using specific primers. MTT-based cytotoxicity assay was used to evaluate the cell viability after treatment with paclitaxel and the conjugates. Cell cycle perturbations were determined using a Fluorescence-Activated Cell Sorter. Results: Non-small cell lung cancer A549 and Calu-6 cells expressed mRNA for SSTR2 and SSTR5. Paclitaxel and the conjugates effectively inhibited the growth of A549 and Calu-6 cells in a concentration- and time-dependent manner. In SSTR-negative fibroblasts, the conjugates were less cytotoxic than paclitaxel. The conjugates and paclitaxel could induce the increase of G2/M phase ratio in A549 cells. Conclusion: The paclitaxel-octreotide conjugates can be used as selective-targeted chemotherapeutic agents for treating non-small cell lung cancer.Π¦Π΅Π»Ρ: ΠΎΡΠ΅Π½ΠΈΡΡ ΡΡΡΠ΅ΠΊΡ ΠΊΠΎΠ½ΡΡΠ³Π°ΡΠΎΠ² ΠΏΠ°ΠΊΠ»ΠΈΡΠ°ΠΊΡΠ΅Π»Π°-ΠΎΠΊΡΡΠ΅ΠΎΡΠΈΠ΄Π° Π½Π° ΡΠΎΡΡ ΠΊΡΠ»ΡΡΠΈΠ²ΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
ΠΊΠ»Π΅ΡΠΎΠΊ Π½Π΅ΠΌΠ΅Π»ΠΊΠΎΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠ³ΠΎ ΡΠ°ΠΊΠ°
Π»Π΅Π³ΠΊΠΎΠ³ΠΎ ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΠ°. ΠΠ΅ΡΠΎΠ΄Ρ: Π΄Π»Ρ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΠΌΠ ΠΠ ΠΏΠΎΠ΄ΡΠΈΠΏΠΎΠ² ΡΠ΅ΡΠ΅ΠΏΡΠΎΡΠ° ΡΠΎΠΌΠ°ΡΠΎΡΡΠ°ΡΠΈΠ½Π° ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΠ° (SSTR) ΠΏΡΠΈΠΌΠ΅Π½ΡΠ»ΠΈ ΠT-ΠΠ¦Π .
ΠΠ½Π°Π»ΠΈΠ· ΡΠΈΡΠΎΡΠΎΠΊΡΠΈΡΠ½ΠΎΡΡΠΈ Π² ΠΠ’Π’-ΡΠ΅ΡΡΠ΅ ΠΏΡΠΈΠΌΠ΅Π½ΡΠ»ΠΈ Π΄Π»Ρ ΠΎΡΠ΅Π½ΠΊΠΈ Π²ΡΠΆΠΈΠ²Π°Π΅ΠΌΠΎΡΡΠΈ ΠΊΠ»Π΅ΡΠΎΠΊ ΠΏΠΎΡΠ»Π΅ ΠΈΡ
ΠΈΠ½ΠΊΡΠ±Π°ΡΠΈΠΈ Ρ ΠΏΠ°ΠΊΠ»ΠΈΡΠ°ΠΊΡΠ΅Π»ΠΎΠΌ
ΠΈ ΠΊΠΎΠ½ΡΡΠ³Π°ΡΠ°ΠΌΠΈ. ΠΠ°ΡΡΡΠ΅Π½ΠΈΡ ΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠ³ΠΎ ΡΠΈΠΊΠ»Π° ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ»ΠΈ Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ΠΌ FACS β ΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠ΅ΡΠ°. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ:
ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΠΊΠ»Π΅ΡΠΎΡΠ½ΡΠ΅ Π»ΠΈΠ½ΠΈΠΈ Π½Π΅ΠΌΠ΅Π»ΠΊΠΎΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠ³ΠΎ ΡΠ°ΠΊΠ° Π»Π΅Π³ΠΊΠΎΠ³ΠΎ A549 ΠΈ Calu-6 ΡΠΊΡΠΏΡΠ΅ΡΡΠΈΡΡΡΡ SSTR2 ΠΈ SSTR5 ΠΌΠ ΠΠ.
ΠΡΠΌΠ΅ΡΠ΅Π½ΠΎ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΠ΅ Π΄ΠΎΠ·ΠΎ- ΠΈ Π²ΡΠ΅ΠΌΡΠ·Π°Π²ΠΈΡΠΈΠΌΠΎΠ΅ ΡΠ³Π½Π΅ΡΠ΅Π½ΠΈΠ΅ ΡΠΎΡΡΠ° ΠΊΠ»Π΅ΡΠΎΠΊ A549 ΠΈ Calu-6 ΠΏΠ°ΠΊΠ»ΠΈΡΠ°ΠΊΡΠ΅Π»ΠΎΠΌ ΠΈ ΠΊΠΎΠ½ΡΡΠ³Π°ΡΠ°ΠΌΠΈ.
ΠΠ»Ρ SSTR-Π½Π΅Π³Π°ΡΠΈΠ²Π½ΡΡ
ΡΠΈΠ±ΡΠΎΠ±Π»Π°ΡΡΠΎΠ² ΠΊΠΎΠ½ΡΡΠ³Π°ΡΡ ΠΌΠ΅Π½Π΅Π΅ ΡΠΈΡΠΎΡΠΎΠΊΡΠΈΡΠ½Ρ, ΡΠ΅ΠΌ ΠΏΠ°ΠΊΠ»ΠΈΡΠ°ΠΊΡΠ΅Π». ΠΠΎΠ½ΡΡΠ³Π°ΡΡ ΠΈ ΠΏΠ°ΠΊΠ»ΠΈΡΠ°ΠΊΡΠ΅Π» ΠΌΠΎΠ³ΡΡ
ΠΈΠ½Π΄ΡΡΠΈΡΠΎΠ²Π°ΡΡ ΠΏΠΎΠ²ΡΡΠ΅Π½ΠΈΠ΅ ΡΠΎΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ ΡΠ°Π· G2
/M Π² ΠΊΠ»Π΅ΡΠΊΠ°Ρ
A549. ΠΡΠ²ΠΎΠ΄Ρ: ΠΊΠΎΠ½ΡΡΠ³Π°ΡΡ ΠΏΠ°ΠΊΠ»ΠΈΡΠ°ΠΊΡΠ΅Π»-ΠΎΠΊΡΡΠ΅ΠΎΡΠΈΠ΄Π° ΠΌΠΎΠ³ΡΡ Π±ΡΡΡ
ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½Ρ ΠΊΠ°ΠΊ ΡΠ΅Π»Π΅ΠΊΡΠΈΠ²Π½ΡΠ΅ Ρ
ΠΈΠΌΠΈΠΎΡΠ΅ΡΠ°ΠΏΠ΅Π²ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π°Π³Π΅Π½ΡΡ Π΄Π»Ρ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ Π½Π° Π½Π΅ΠΌΠ΅Π»ΠΊΠΎΠΊΠ»Π΅ΡΠΎΡΠ½ΡΠΉ ΡΠ°ΠΊ Π»Π΅Π³ΠΊΠΎΠ³ΠΎ
A REAL TIME MONITORING MODEL OF THE CALCIUM CARBONATE FOULING INDUCTION PERIOD BASED ON THE CONDUCTANCE TITRATION
A new method has been developed to monitor the calcium carbonate fouling induction period (CCFIP) in real time. Based on the conductance titration, this paper investigated the forming process of CCFIP by a staticdynamic combined simulation experiment unit. With the help of titration analysis (that is titrimetry), an accurate definition of CCFIP and the corresponding real time monitoring model were built up. The investigation results show that the proposed model applies not only to measure the CCFIP in real time, but also applies to an investigation of the influence of various factors on the CCFIP
State transfer in dissipative and dephasing environments
By diagonalization of a generalized superoperator for solving the master
equation, we investigated effects of dissipative and dephasing environments on
quantum state transfer, as well as entanglement distribution and creation in
spin networks. Our results revealed that under the condition of the same
decoherence rate , the detrimental effects of the dissipative
environment are more severe than that of the dephasing environment. Beside
this, the critical time at which the transfer fidelity and the
concurrence attain their maxima arrives at the asymptotic value
quickly as the spin chain length increases. The transfer
fidelity of an excitation at time is independent of when the system
subjects to dissipative environment, while it decreases as increases when
the system subjects to dephasing environment. The average fidelity displays
three different patterns corresponding to , and . For
each pattern, the average fidelity at time is independent of when the
system subjects to dissipative environment, and decreases as increases when
the system subjects to dephasing environment. The maximum concurrence also
decreases as increases, and when , it arrives at an
asymptotic value determined by the decoherence rate and the structure
of the spin network.Comment: 12 pages, 6 figure
Optimal quantum pump in the presence of a superconducting lead
We investigate the parametric pumping of a hybrid structure consisting of a
normal quantum dot, a normal lead and a superconducting lead. Using the time
dependent scattering matrix theory, we have derived a general expression for
the pumped electric current and heat current. We have also derived the
relationship among the instantaneous pumped heat current, electric current, and
shot noise. This gives a lower bound for the pumped heat current in the hybrid
system similar to that of the normal case obtained by Avron et al
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