We report the observation of two narrow structures in the mass spectra of the π±Υ(nS) (n=1, 2, 3) and π±hb(mP) (m=1, 2) pairs that are produced in association with a single charged pion in Υ(5S) ...decays. The measured masses and widths of the two structures averaged over the five final states are M1=(10 607.2±2.0) MeV/c2, Γ1=(18.4±2.4) MeV, and M2=(10 652.2±1.5) MeV/c2, Γ2=(11.5±2.2) MeV. The results are obtained with a 121.4 fb-1 data sample collected with the Belle detector in the vicinity of the Υ(5S) resonance at the KEKB asymmetric-energy e+e- collider.
Estrogen (ER), progestin (PGR), and androgen (AR) receptors were assayed in cytosols prepared from 38 various intracranial tumors. The receptors were in the following proportions (number of ...receptor‐positive/number of tumors examined): meningiomas were positive for PGR (4/6) and AR (2/5); glioblastomas were also positive for PGR (3/21) and AR (7/21); astrocytomas were positive only for PGR (4/5); and oligodendrogliomas only for AR. In two hamartomas AR was present, while in one chordoma both PGR and AR were present. In this latter tumor ER were not assayed due to insufficient material. The receptors were present in concentrations between 10 and 20 fmol/mg protein. Exceptions were two meningiomas and a chordoma with a high concentration of PGR and AR. Our results support the notion that a proportion of intracranial tumors contains sex steroid receptors, and some of these tumors might be hormonally dependent.
Search for heavy neutrinos at Belle Arinstein, K.; Aulchenko, V.; Bakich, A. M. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
04/2013, Volume:
87, Issue:
7
Journal Article
Open access
We report on a search for heavy neutrinos in B-meson decays. The results are obtained using a data sample that contains 772 x 10 super(6) BB pairs collected at the Upsilon(4S) resonance with the ...Belle detector at the KEKB asymmetric-energy e super(+)e super(-) collider. No signal is observed and upper limits are set on mixing of heavy neutrinos with left-handed neutrinos of the Standard Model in the mass range 0.5-5.0 GeV/c super(2).
A method which enables analysis of DNA from archival paraffin embedded normal and malignant brain tissue is described. The demonstration of a 317-bp long beta-actin DNA sequence by the polymerase ...chain reaction (PCR) was used to identify which fixation procedure, deparaffinization time and DNA extraction procedure would give the best results. Tissue specimens 1-39 years old were included in the experiments. Specimens fixed in either 10% formalin, Carnoy's or AMeX fixative were found to be best suited for subsequent analysis by PCR. Paraformaldehyde and acetone compromised amplification efficiency, while Bouin's fixed tissue gave uniformly negative results. Regardless of fixative used, PCR reaction had to be run through at least 40 cycles. Prolonged deparaffinization time and phenol/chloroform extraction of DNA did not influence DNA quality as a template for PCR reaction. Formalin fixed brain tumours can be successfully used for DNA/PCR analysis even if they are up to 39 years old.
Since brain damage in closed head injury of acceleration-deceleration type depends on the site of impact and on the course of the traumatising force, a reconstruction of these was attempted using CT. ...The study included 45 standard CT studies of adults with closed acceleration-deceleration head injuries. We selected 32 patients exclusively on the basis of CT findings of soft tissue contusion, skull fractures and cerebral contusions (coup and/or contrecoup, as well as other parenchymal lesions), while in the remaining 13 patients clinical findings were also used. On CT, the axial section of the skull was divided into 12 sections imitating the clock-face, to permit computerised graphic presentation of the direction of the traumatising force. Analysis of cerebral contusions on different CT studies in each case allowed location of "dominant coup" and "dominant contrecoup" lesions to be determined. The site of impact and the course of the traumatising force were reconstructed and graphically presented on the basis of these findings, supplemented with data on soft tissue contusions (present in 71% of cases), skull fractures (in 36%) and sometimes on other brain lesions. Comparison of the computerised graphic presentation of the site of impact and direction of the traumatic force and the location of lesions revealed a high correlation between them. In 80% of cases, the site of impact could be visualised only by CT. The acceleration force acted along the longer axis of the head (centroaxial or semioblique) in 87% and along the shorter axis in 13% of cases. Multiple lesions were found in 87% of cases. The lesions were most frequent in the frontal (51%) and temporal (26%) lobes. CT was very useful for reconstruction of the site of impact and of the course of the traumatising force in acceleration head injury. Data obtained by this procedure may have far-reaching prognostic and forensic implications.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) Abstract We report a search for B decays to selected final states with the eta ^sub c^ meson: B ^sup ±^ arrow right K ^sup ...±^ eta ^sub c^ pi ^sup +^ pi ^sup -^, B ^sup ±^ arrow right K ^sup ±^ eta ^sub c^ omega, B ^sup ±^ arrow right K ^sup ±^ eta ^sub c^ eta and B ^sup ±^ arrow right K ^sup ±^ eta ^sub c^ pi ^sup 0^. The analysis is based on 772 × 10^sup 6^ ... pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e ^sup +^ e ^sup -^ collider. We set 90% confidence level upper limits on the branching fractions of the studied B decay modes, independent of intermediate resonances, in the range (0.6-5.3) × 10^sup -4^. We also search for molecular-state candidates in the ... and ... combinations, neutral partners of the Z(3900)^sup ±^ and Z(4020)^sup ±^, and a poorly understood state X(3915) as possible intermediate states in the decay chain, and set 90% confidence level upper limits on the product of branching fractions to the mentioned intermediate states and decay branching fractions of these states in the range (0.6-6.9) × 10^sup -5^. Figure not available: see fulltext.
CT analysis of missile head injury Besenski, N; Jadro-Santel, D; Jelavić-Koić, F ...
Neuroradiology,
04/1995, Volume:
37, Issue:
3
Journal Article
Peer reviewed
Between August 1991 and December 1992, CT was performed on 154 patients who had suffered missile head injury during the war in the Republic of Croatia. In 54% CT was performed 1-24 h after injury, ...and in 27% follow-up CT was also obtained. The wounds were penetrating, tangential or perforating (45%, 34% and 21%, respectively). Haemorrhage was the most frequent lesion in the brain (84%). Follow-up CT evolution of haemorrhage, oedema, cerebritis, abscess, secondary vascular lesions, necrosis, encephalomalacia and hydrocephalus. The most dynamic changes occurred 7-14 days after injury. In 14% of cases, deep cerebral lesions were found in the corpus callosum, septum pellucidum periventricular region and pons, although bone and shell fragments were in a different part of the brain parenchyma. Such lesions were found in penetrating injuries only. CT proved very useful for assessing the extent and type of lesions. Although different mechanisms of brain damage in missile head injury are known, here they are, to the best of our knowledge, shown for the first time by CT.
Computed tomographic analysis of lesions of the corpus callosum in 13 patients with "inner cerebral trauma" showed significant congruence of linear translation of acceleration and the topographic ...distribution of such lesions. This congruence permits computed tomography to be used to reconstruct the course of linear translation and the site of the main blow, which can be important for forensic use. The findings of even a small lesion in the corpus callosum indicates the need for further investigation of other structures which are usually involved in inner cerebral trauma, such as the hippocampus and brain stem.
Autosomal dominant motor and sensory neuropathy with liability to pressure palsies was studied in three members of the same family. Only one of two monozygotic twin sisters was clinically affected. ...She developed unilateral peroneal palsy twenty minutes following local pressure. Electromyography revealed a weak intermediate innervation pattern with very rapid action potentials in the right anterior lower leg muscle. A 25-70 per cent reduction of motor and sensory conduction velocity was recorded in the clinically unaffected twin sister and in the father. The electrophysiological findings in the mother were normal. The sural nerve biopsy revealed "sausage-like" formations. The palsy persisted for two months and disappeared after eight weeks of fluocortolon treatment. It is possible that the myelin sheaths acted as antigen.
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