373 research outputs found
SU(2)-in-SU(1,1) Nested Interferometer for Highly Sensitive, Loss-Tolerant Quantum Metrology
We present experimental and theoretical results on a new interferometer
topology that nests a SU(2) interferometer, e.g., a Mach-Zehnder or Michelson
interferometer, inside a SU(1,1) interferometer, i.e., a Mach-Zehnder
interferometer with parametric amplifiers in place of beam splitters. This
SU(2)-in-SU(1,1) nested interferometer (SISNI) simultaneously achieves high
signal-to-noise ratio (SNR), sensitivity beyond the standard quantum limit
(SQL) and tolerance to photon losses external to the interferometer, e.g., in
detectors. We implement a SISNI using parametric amplification by four-wave
mixing (FWM) in Rb vapor and a laser-fed Mach-Zehnder SU(2) interferometer. We
observe path-length sensitivity with SNR 2.2 dB beyond the SQL at power levels
(and thus SNR) 2 orders of magnitude beyond those of previous loss-tolerant
interferometers. We find experimentally the optimal FWM gains and find
agreement with a minimal quantum noise model for the FWM process. The results
suggest ways to boost the in-practice sensitivity of high-power
interferometers, e.g., gravitational wave interferometers, and may enable
high-sensitivity, quantum-enhanced interferometry at wavelengths for which
efficient detectors are not available.Comment: 6 pages + 4 of supplemental material, 5 figure
Observed photodetachment in parallel electric and magnetic fields
We investigate photodetachment from negative ions in a homogeneous 1.0-T
magnetic field and a parallel electric field of approximately 10 V/cm. A
theoretical model for detachment in combined fields is presented. Calculations
show that a field of 10 V/cm or more should considerably diminish the Landau
structure in the detachment cross section. The ions are produced and stored in
a Penning ion trap and illuminated by a single-mode dye laser. We present
preliminary results for detachment from S- showing qualitative agreement with
the model. Future directions of the work are also discussed.Comment: Nine pages, five figures, minor revisions showing final publicatio
Correlation between chemical composition, EHGE and TME of corn for ducks
Correlations between chemical composition, enzymatic hydrolysate gross energy (EHGE), and true metabolizable energy (TME) of corn for ducks were investigated. Twenty-two corn samples were collected from various regions in 11 provinces of China. The crude protein (CP), ether extract (EE), neutral detergent fibre (NDF), Ash, gross energy (GE), dry matter (DM), amylopectin (AP), amylose (AM), total starch (TS), and AP/AM were determined for each sample. Five of the samples of corn were chosen at the mean, mean Β± 1 standard deviation (SD), and mean Β± 2 SD based on AP/AM. The EHGE of these samples was analysed using the pepsin-artificial small intestinal fluid enzymatic method. These five samples were also force-fed to male Cherry Valley ducks to assay their TME. Finally, correlation analyses were performed, and regression equations were established. Ash content, GE, and TS were highly related to EHGE. Univariate prediction equations were EHGE = 11.8566Ash-0.0421 (P <0.05), EHGE = 0.1535GE1.5642 (P <0.05), and EHGE = 0.1020TS1.1561 (P <0.05). The total starch, AP/AM, and ash of the chemical compositions were highly related to TME. The corresponding univariate regression equations were TME = 21.9355TS-0.0910 (P <0.05), TME = 15.6590AP/AM-0.0559 (P <0.05), and TME = 15.0778Ash0.0442 (P <0.05). The mean EHGE was equivalent to 78.5% of TME, but their correlation coefficient was low. In conclusion, chemical composition was predictive of EHGE and TME of corn samples for ducks, but the correlation of EHGE and TME was low
Keywords: Cherry Valley duck, amylopectin, amylose, true metabolizable energ
Dwarfing gene Rht18 from tetraploid wheat responds to exogenous GA<sub>3</sub> in hexaploid wheat
Rht18, derived from Triticum durum (tetraploid) wheat, is classified as a gibberellic acid (GA)-responsive dwarfing gene. Prior to this study, the responses of Rht18 to exogenous GA on agronomic traits in hexaploid wheat were still unknown. The response of Rht18 to exogenous GA3 on coleoptile length, plant height, yield components and other agronomic traits were investigated using F4:5 and F5:6 hexaploid dwarf lines with Rht18 derived from two crosses between the tetraploid donor Icaro and tall Chinese winter wheat cultivars, Xifeng 20 and Jinmai 47. Applications of exogenous GA3 significantly increased coleoptile length in both lines and their tall parents. Plant height was significantly increased by 21.3 and 10.7% in the GA3-treated dwarf lines of Xifeng 20 and Jinmai 47, respectively. Compared to the untreated dwarf lines, the partitioning of dry matter to ears at anthesis was significantly decreased while the partitioning of dry matter to stems was significantly increased in the GA3-treated dwarf lines. There were no obvious changes in plant height and dry matter partitioning in the GA3-treated tall parents. Exogenous GA3 significantly decreased grain number spikeβ1 while it increased 1000-kernel weight in both the dwarf lines and tall parents. Thus, applications of exogenous GA3 restored plant height and other agronomic traits of Rht18 dwarf lines to the levels of the tall parents. This study indicated that Rht18 dwarf mutants are GA-deficient lines with impaired GA biosynthesis
Observation of Two New N* Peaks in J/psi -> and Decays
The system in decays of is limited to be
isospin 1/2 by isospin conservation. This provides a big advantage in studying
compared with and experiments which mix
isospin 1/2 and 3/2 for the system. Using 58 million decays
collected with the Beijing Electron Positron Collider, more than 100 thousand
events are obtained. Besides two well known
peaks at 1500 MeV and 1670 MeV, there are two new, clear peaks in
the invariant mass spectrum around 1360 MeV and 2030 MeV. They are the
first direct observation of the peak and a long-sought "missing"
peak above 2 GeV in the invariant mass spectrum. A simple
Breit-Wigner fit gives the mass and width for the peak as MeV and MeV, and for the new peak above 2 GeV
as MeV and MeV, respectively
Relationship between HPV16/18 E6 and Ρ53, Ρ21waf1, MDM2, Ki67 and cyclin D1 expression in esophageal squamous cell carcinoma: comparative study by using tissue microarray technology
Aim: To investigate the role of human papillomavirus (HPV) HPV16/18 E6 oncogene in the carcinogenesis of esophageal cell carcinoma (ESCC). Materials and Methods: Tissue microarray (TMA) block was constructed from 60 cases of paraffin-embedded ESCC tissues and pair-matched controls (adjacent normal epithelium). Immunohistochemistry (IHC) methods were applied to detect the expression of HPV16/18 E6, p53, p21Waf1, MDM2, Ki67 and cyclin D1 proteins on TMA slides. In situ hybridization (ISH) targeting HPV gene was also used. Results: In ESCC samples, 18.3% (11/60) were revealed HPV16/18 E6 positive by IHC, while 40.0% (24/60) HPV positive by ISH; HPV16/18 E6 expression was significantly higher than that of control samples. In ESCC samples, the expressions of p53, p21Waf1, Cyclin D1, MDM2 and Ki67 were recorded in 60.0% (36/60), 40.0% (24/60), 51.7% (31/60), 65.0% (39/60) and 88.3% (53/60) cases respectively, In ESCC samples, p53, MDM2 and Ki67 expression correlated with the HPV16/18 E6 expression (p < 0.01), p21Waf1 expression β with these of MDM2 and cyclin D1 (p < 0.01) whilst expression of Ki67 β with ESCC grade (p < 0.01). Conclusion: HPV might be one of etiological factor of esophageal carcinoma in Shantou, China. p53, MDM2 proteins may play important roles in the pathogenesis of HPV-associated ESCC.Π¦Π΅Π»Ρ: ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΡ ΡΠΎΠ»Ρ ΠΎΠ½ΠΊΠΎΠ³Π΅Π½Π° HPV16/18 E6 Π²ΠΈΡΡΡΠ° ΠΏΠ°ΠΏΠΈΠ»Π»ΠΎΠΌΡ ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΠ° (HPV) Π² ΡΠ°Π·Π²ΠΈΡΠΈΠΈ ΠΏΠ»ΠΎΡΠΊΠΎΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠΉ ΠΊΠ°ΡΡΠΈΠ½ΠΎΠΌΡ
ΠΏΠΈΡΠ΅Π²ΠΎΠ΄Π° (ESCC). ΠΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ: ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ 60 ΠΎΠ±ΡΠ°Π·ΡΠΎΠ² ESCC ΠΈ ΠΊΠΎΠ½ΡΡΠΎΠ»ΡΠ½ΡΠ΅ ΠΎΠ±ΡΠ°Π·ΡΡ Π½Π΅ΡΡΠ°Π½ΡΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ
ΡΠΊΠ°Π½ΠΈ (ΠΏΠ°ΡΠ°ΡΠΈΠ½ΠΎΠ²ΡΠ΅ Π±Π»ΠΎΠΊΠΈ). ΠΠ»Ρ Π²ΡΡΠ²Π»Π΅Π½ΠΈΡ ΡΠΊΡΠΏΡΠ΅ΡΡΠΈΠΈ Π±Π΅Π»ΠΊΠΎΠ² HPV16/18 E6, p53, p21Waf1, MDM2, Ki67 ΠΈ ΡΠΈΠΊΠ»ΠΈΠ½Π° D1 Π² ΡΡΠ΅Π·Π°Ρ
Π΄Π»Ρ ΡΠΊΠ°Π½Π΅Π²ΡΡ
ΠΌΠΈΠΊΡΠΎΡΠΈΠΏΠΎΠ² (tissue microarray, TMA) ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ ΠΌΠ΅ΡΠΎΠ΄ ΠΈΠΌΠΌΡΠ½ΠΎΠ³ΠΈΡΡΠΎΡ
ΠΈΠΌΠΈΠΈ (IHC), Π΄Π»Ρ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΠΊΡΠΏΡΠ΅ΡΡΠΈΠΈ
Π³Π΅Π½ΠΎΠ² HPV ΠΏΡΠΈΠΌΠ΅Π½ΡΠ»ΠΈ Π³ΠΈΠ±ΡΠΈΠ΄ΠΈΠ·Π°ΡΠΈΡ in situ (ISH). Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ: ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ IHC, ΡΠΊΡΠΏΡΠ΅ΡΡΠΈΡ HPV16/18 E6 Π²ΡΡΠ²Π»Π΅Π½Π° Π² 18,3%
(11/60) ΡΠ»ΡΡΠ°Π΅Π² ESCC, Π² ΡΠΎ Π²ΡΠ΅ΠΌΡ ΠΊΠ°ΠΊ ΠΏΠΎ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ°ΠΌ ΠΌΠ΅ΡΠΎΠ΄Π° ISH, 40,0% (24/60) ΠΎΠ±ΡΠ°Π·ΡΠΎΠ² ΠΏΡΠΈΠ·Π½Π°Π½Ρ HPV-ΠΏΠΎΠ·ΠΈΡΠΈΠ²Π½ΡΠΌΠΈ.
Π ΠΎΠ±ΡΠ°Π·ΒΡΠ°Ρ
ESCC ΡΠΊΡΠΏΡΠ΅ΡΡΠΈΡ p53, p21Waf1, ΡΠΈΠΊΠ»ΠΈΠ½Π° D1, MDM2 ΠΈ Ki67 Π²ΡΡΠ²Π»Π΅Π½Π° Π² 60,0% (36/60), 40,0% (24/60), 51,7% (31/60),
65,0% (39/60) ΠΈ 88,3% (53/60) ΡΠ»ΡΡΠ°Π΅Π² ΡΠΎΠΎΡΠ²Π΅ΡΒΡΡΠ²Π΅Π½Π½ΠΎ, ΠΏΡΠΈΡΠ΅ΠΌ ΡΠΊΡΠΏΡΠ΅ΡΡΠΈΡ p53, MDM2 ΠΈ Ki67 ΠΊΠΎΡΡΠ΅Π»ΠΈΡΠΎΠ²Π°Π»Π° Ρ ΡΠΊΡΠΏΡΠ΅ΡΡΠΈΠ΅ΠΉ
HPV16/18 E6 (p < 0,01), ΡΠΊΡΠΏΡΠ΅ΡΡΠΈΡ p21Waf1 β Ρ ΡΠ°ΠΊΠΎΠ²ΠΎΠΉ MDM2 ΠΈ ΡΠΈΠΊΠ»ΠΈΠ½Π° D1, Π° ΡΠΊΡΠΏΡΠ΅ΡΡΠΈΡ Ki67 β ΡΠΎ ΡΡΠ°Π΄ΠΈΠ΅ΠΉ ΡΠ°Π·Π²ΠΈΡΠΈΡ
ΠΎΠΏΡΡ
ΠΎΠ»ΠΈ (p < 0.01). ΠΡΠ²ΠΎΠ΄Ρ: HPV ΠΌΠΎΠΆΠ΅Ρ ΡΠ²Π»ΡΡΡΡΡ ΠΎΠ΄Π½ΠΈΠΌ ΠΈΠ· ΡΡΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ°ΠΊΡΠΎΡΠΎΠ² ΡΠ°Π·Π²ΠΈΡΠΈΡ ΡΠ°ΠΊΠ° ΠΏΠΈΡΠ΅Π²ΠΎΠ΄Π° Π² ΠΏΡΠΎΠ²ΠΈΠ½ΡΠΈΠΈ
Π¨Π°Π½ΡΡ, ΠΠΈΡΠ°ΠΉ. ΠΠ΅Π»ΠΊΠΈ p53 ΠΈ MDM2 ΠΌΠΎΠ³ΡΡ ΠΏΡΠΈΠ½ΠΈΠΌΠ°ΡΡ ΡΡΠ°ΡΡΠΈΠ΅ Π² ΠΏΠ°ΡΠΎΠ³Π΅Π½Π΅Π·Π΅ ΠΏΠ»ΠΎΡΠΊΠΎΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠ³ΠΎ ΡΠ°ΠΊΠ° ΠΏΠΈΡΠ΅Π²ΠΎΠ΄Π°, Π°ΡΡΠΎΡΠΈΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ
Ρ Π²ΠΈΡΡΡΠΎΠΌ ΠΏΠ°ΠΏΠΈΠ»Π»ΠΎΠΌΠ°ΡΠΎΠ·Π°
Search for Invisible Decays of and in and
Using a data sample of decays collected with the BES
II detector at the BEPC, searches for invisible decays of and
in to and are performed.
The signals, which are reconstructed in final states, are used
to tag the and decays. No signals are found for the
invisible decays of either or , and upper limits at the 90%
confidence level are determined to be for the ratio
and for . These are the first
searches for and decays into invisible final states.Comment: 5 pages, 4 figures; Added references, Corrected typo
Direct Measurements of the Branching Fractions for and and Determinations of the Form Factors and
The absolute branching fractions for the decays and
are determined using singly
tagged sample from the data collected around 3.773 GeV with the
BES-II detector at the BEPC. In the system recoiling against the singly tagged
meson, events for and events for decays are observed. Those yield
the absolute branching fractions to be and . The
vector form factors are determined to be
and . The ratio of the two form
factors is measured to be .Comment: 6 pages, 5 figure
Study of J/psi decays to Lambda Lambdabar and Sigma0 Sigma0bar
The branching ratios and Angular distributions for J/psi decays to Lambda
Lambdabar and Sigma0 Sigma0bar are measured using BESII 58 million J/psi.Comment: 11 pages, 5 figure
Search for the Rare Decays J/Psi --> Ds- e+ nu_e, J/Psi --> D- e+ nu_e, and J/Psi --> D0bar e+ e-
We report on a search for the decays J/Psi --> Ds- e+ nu_e + c.c., J/Psi -->
D- e+ nu_e + c.c., and J/Psi --> D0bar e+ e- + c.c. in a sample of 5.8 * 10^7
J/Psi events collected with the BESII detector at the BEPC. No excess of signal
above background is observed, and 90% confidence level upper limits on the
branching fractions are set: B(J/Psi --> Ds- e+ nu_e + c.c.)<4.8*10^-5, B(J/Psi
--> D- e+ nu_e + c.c.) D0bar e+ e- + c.c.)<1.1*10^-5Comment: 10 pages, 4 figure
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