Nerve Growth Factor Homology in the Nerve Regeneration-Conditioned Fluid of Rabbits and Rats

We analyzed the homology of nerve growth factor (NGF) in the nerve regenerationconditioned fluid (NRCF) obtained from New Zealand white rabbits and SD rats. A nerve regeneration chamber bridged distal and proximal ends of the severed rabbit sciatic nerve, and the NRCF was extracted from such chamber. The supernatants and precipitates of nerve tissue of rabbits and rats were extracted from the sciatic nerves by grinding and centrifugation. An antigen-antibody reaction was detected by the ELISA technique using rabbit anti-mouse NGF as primary antibody and goat anti-rabbit IgG as secondary antibody. Antigen-antibody reactions were detected in all the above-mentioned samples obtained from rabbits and rats. The intensity rank of an antigen-antibody response for different samples was the following: rabbit NRCF > rabbit nerve tissue precipitation fluid > rabbit nerve tissue fluid supernatant > > rat nerve tissue fluid supernatant. Thus, there is high homology of the molecular structure of NGF in the NRCFs obtained from rabbits and rats (i.e., animals belonging to different taxonomic groups of mammals).Ми аналізували молекулярну гомологію росту нервів (NGF) у кондиційованій процесом нервової регенерації рідині (NRCF), котру отримували від новозеландських білих кролів та щурів лінії SD. Нейрорегенеративна камера з’єднувала дистальний та проксимальний кінці перерізаного сідничного нерва у кролів, і NRCF відбирали з такої камери. За допомогою гомогенізації та центрифугування з тканини сідничних нервів кролів та щурів готували супернатанти та преципітати. Реакцію антиген–антитіло виявляли за допомогою методики ELISA, використовуючи первинні антитіла щодо мишачого NGF та вторинні козячі антитіла щодо кролячого імуноглобуліну. Реакції антиген–антитіло виявлялися в усіх вищезгаданих зразках, отриманих від кролів та щурів. Послідовність інтенсивностей відповідей антиген-антитіло у різних зразках була такою: кроляча NRCF > преципітат із нервової тканини кроля > супернатант із нервової тканини кроля > супернатант із нервової тканини щура. Отже, молекулярна структура зразків NGF, що знаходяться в NRCF, отриманій від кролів та щурів (тобто тварин, котрі належать до різних таксономічних груп ссавців), демонструє високий рівень гомології

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

BESII Detector Simulation

A Monte Carlo program based on Geant3 has been developed for BESII detector simulation. The organization of the program is outlined, and the digitization procedure for simulating the response of various sub-detectors is described. Comparisons with data show that the performance of the program is generally satisfactory.Comment: 17 pages, 14 figures, uses elsart.cls, to be submitted to NIM

Measurements of the observed cross sections for exclusive light hadron production in e^+e^- annihilation at \sqrt{s}= 3.773 and 3.650 GeV

By analyzing the data sets of 17.3 pb$^{-1}$ taken at $\sqrt{s}=3.773$ GeV and 6.5 pb$^{-1}$ taken at $\sqrt{s}=3.650$ GeV with the BESII detector at the BEPC collider, we have measured the observed cross sections for 12 exclusive light hadron final states produced in $e^+e^-$ annihilation at the two energy points. We have also set the upper limits on the observed cross sections and the branching fractions for $\psi(3770)$ decay to these final states at 90% C.L.Comment: 8 pages, 5 figur

Measurements of J/psi Decays into 2(pi+pi-)eta and 3(pi+pi-)eta

Based on a sample of 5.8X 10^7 J/psi events taken with the BESII detector, the branching fractions of J/psi--> 2(pi+pi-)eta and J/psi-->3(pi+pi-)eta are measured for the first time to be (2.26+-0.08+-0.27)X10^{-3} and (7.24+-0.96+-1.11)X10^{-4}, respectively.Comment: 11 pages, 6 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

Measurement of branching fractions for the inclusive Cabibbo-favored ~K*0(892) and Cabibbo-suppressed K*0(892) decays of neutral and charged D mesons

The branching fractions for the inclusive Cabibbo-favored ~K*0 and Cabibbo-suppressed K*0 decays of D mesons are measured based on a data sample of 33 pb-1 collected at and around the center-of-mass energy of 3.773 GeV with the BES-II detector at the BEPC collider. The branching fractions for the decays D+(0) -> ~K*0(892)X and D0 -> K*0(892)X are determined to be BF(D0 -> \~K*0X) = (8.7 +/- 4.0 +/- 1.2)%, BF(D+ -> ~K*0X) = (23.2 +/- 4.5 +/- 3.0)% and BF(D0 -> K*0X) = (2.8 +/- 1.2 +/- 0.4)%. An upper limit on the branching fraction at 90% C.L. for the decay D+ -> K*0(892)X is set to be BF(D+ -> K*0X) < 6.6%

Study of J/ψ→ωK+K−J/\psi \to \omega K^+K^-

New data are presented on $J/\psi \to \omega K^+K^-$ from a sample of 58M $J/\psi$ events in the upgraded BES II detector at the BEPC. There is a conspicuous signal for $f_0(1710) \to K^+K^-$ and a peak at higher mass which may be fitted with $f_2(2150) \to K\bar K$. From a combined analysis with $\omega \pi ^+ \pi ^-$ data, the branching ratio $BR(f_0(1710)\to\pi\pi)/BR(f_0(1710) \to K\bar K)$ is $< 0.11$ at the 95% confidence level.Comment: 11 pages, 5 figures. Submitted to Phys. Lett.

Measurements of psi(2S) decays to octet baryon-antibaryon pairs

With a sample of 14 million psi(2S) events collected by the BESII detector at the Beijing Electron Positron Collider (BEPC), the decay channels psi(2S)->p p-bar, Lambda Lambda-bar, Sigma0 Sigma0-bar, Xi Xi-bar are measured, and their branching ratios are determined to be (3.36+-0.09+-0.24)*10E-4, (3.39+-0.20+-0.32)*10E-4, (2.35+-0.36+-0.32)*10E-4, (3.03+-0.40+-0.32)*10E-4, respectively. In the decay psi(2S)->p p-bar, the angular distribution parameter alpha is determined to be 0.82+-0.17+-0.04.Comment: 8 pages, 8 figure