We have surveyed the cluster system of the SMC with the aim of identifying close pairs of clusters. We find that the number of existing close cluster pairs is significantly (at the 3.5 σ level) larger than the expected number of such pairs due to the chance line-up of single clusters, implying that some of these pairs are physically associated. Comparison with the LMC cluster system shows that the ratio of pairs is similar to the ratio of single clusters in the two galaxies. These results, combined with the earlier results for the LMC, indicate the tendency of clusters to form in pairs, or possibly in groups, at least in the case of irregular galaxies, the probability that the observed number of pairs having formed due to tidal capture being small.
A new catalogue of clusters in the Large Magellanic Cloud has been constructed from searches of the IIIa-J component of the ESO/SERC Southern Sky Atlas. The catalogue contains coordinate and diameter measurements of 1762 clusters in a 25^deg^ x 25^deg^ area of sky centred on the LMC, but excluding the very crowded 3.5 deg^2^ region around the Bar. The distribution of there clusters appears as two superimposed elliptical systems. The higher density inner system extends over ~ 8^deg^; the lower density outer system can be represented by a 13^deg^ x 10^deg^ disc inclined at 42^deg^ to the line of sight. There are suggestions of two weak "arms" in the latter.
We present an efficient numerical method to calculate shape truncation functions for Wigner-Seitz atomic polyhedra in crystalline solids. We apply our method to the case of simple cubic (SC), face centered cubic (FCC) and body centered cubic (BCC) lattices. A straightforward comparison of our results and of those obtained by other numerical techniques with the exact ones, analytically known in some simple cases, shows the efficiency and high accuracy of our method.
Ras p21 and myc p62 expression has been examined immunohistochemically in seventy specimens of bronchial carcinomas. Both ras and myc oncoproteins were found to be overexpressed at a higher frequency in non small cell carcinomas (squamous cell carcinomas and adenocarcinomas) compared to the small cell carcinoma specimens; however only myc p62 overexpression was found to be statistically significant. Also, ras p21 oncoprotein expression was frequently overexpressed in adenocarcinomas compared to squamous cell carcinomas (p < 0.05). Overexpression of c-myc p62 was found to correlate with poorly differentiated squamous cell carcinomas compared to the well and moderately differentiated tumors. The results of this study indicate that both the ras and myc oncogenes are important in the progression of bronchial carcinomas.
This study was undertaken to assess the value of intravesical interferon alfa-2b treatment in preventing the recurrences of superficial transitional cell carcinoma of the bladder. A total of 30 patients aged from 33 to 78 entered the protocol. The intravesical instillations were performed once a week for 8 weeks. A solution of 10 x 106 IU interferon alfa-2b in 30 ml of normal saline was used. Follow-up ranged from 12 to 28 months. Of the 30 patients, 19 (63.33%) were tumor free at the end of follow-up. Of the remaining 11 patients, 7 presented with recurrent superficial tumors and 4 with invasive bladder tumors. No side effects were noted.
We descibe a patient with adult onset Still's disease (AOSD) who developed meningoencephalitis, sensorimotor peripheral neuropathy and uveitis during the course of disease. An abnormal cerebrospinal fluid and changes on nerve conduction studies substantiated the diagnoses of these unusual complications. The meningoencephalopathy improved before corticosteroid treatment, and the peripheral neuropathy and other features of AOSD have responded to corticosteroids. Our case illustrates the rare occurrence of both cental and peripheral neurological involvement in AOSD.
Wet precipitation-only samplers were used to collect wet deposition at two sites in the Athens basin, Greece for the period March 1986 - February 1987. Concentrations of major cations (H +, NH 4 +, Na +, K +, CA 2+) and major anions (Cl -, NO 3 - and SO 4 2-) were determined for the first time in rainwater samples in Greece. Bicarbonate concentrations were calculated. The relative importance of natural and anthropogenic sources were estimated by a chemical balance. The majority of rain collected has a neutral or alkaline character. Acidity was due to the presence of H 2SO 4 and HNO 3. The statistical analysis of the correlation between the concentration of chemical species confirm the influence of natural and anthropogenic sources. In all samples, SO 4 2- concentrations exceed NO 3 - concentrations exceed NO 3 - concentrations despite the dominance of low S oil burning in the region. The wet flux of S was calculated to be 0.34 g m -2 a -1.
High-energy neutrons produced as a consequence of proton acceleration in active galactic nuclei (AGNs) can carry a substantial fraction of the initial luminosity outside of the central source. Part of this luminosity is expected to go into VHE and UHE γ-ray emission as a result of hadronic interactions of these relativistic particles with the accreting plasma. We find that the most efficient emitters will be AGNs with luminosities ~0.01 - 0-1 of the Eddington luminosity.
Kamperidis, Irene (1990). "Women break the EEC barriers before the completion of the integrated market”. Greek Business, International Greek Magazine for Trade and Investment. Issue 1/1990: 84.
