Atomic structure and segregation in alkali-metal heteroclusters

The ground-state atomic and electronic distributions in NamCsn clusters with composition m=n and m=2n have been calculated by minimizing the total cluster energy using the density-functional formalism. The approximation is made by replacing the total external potential of the ions by its spherical average around the cluster center during the iterative process of solving the Kohn-Sham equations for each geometry tested. In the size range studied here (up to 90 atoms per cluster), the cluster is composed of well-separated homoatomic Na and Cs shells, the external one always being a Cs shell. We have also found that the cohesive energy goes rapidly to the bulk limit. An analysis of the geometries shows strong cluster reconstruction with increasing size. By comparing the geometry of pure Nan with that of the Nan core in NanCsn for clusters formed by only an inner Na layer and an outer Cs layer, we have observed that the Nan core adopts a geometry different in most cases from that of the free Nan cluster, and such that the number of faces of the polyhedron formed by the Nan core is as close as possible to the number of external Cs atoms, in order to accomodate these Cs atoms on top of the faces of the polyhedron

Comparison between clinical significance of serum proinflammatory proteins (IL-6 and CRP) and classic tumor markers (CEA and CA 19-9) in gastric cancer

Gastric cancer (GC) is a second most common cause of cancer-related death and represents an inflammation-driven malignancy. It has been suggested that interleukin 6 (IL-6) and C-reactive protein (CRP) play a potential role in the growth and progression of GC. The aim of the present study was to compare clinical significance of IL-6 and CRP with classic tumor markers—carcinoembryonic antigen (CEA) and carbohydrate antigen (CA 19-9) in GC patients. The study included 92 patients with GC and 70 healthy subjects. The serum concentrations of IL-6, CEA and CA 19-9 were determined using immunoenzyme assays, whereas CRP using immunoturbidimetric method. We defined the diagnostic criteria and prognostic value for proteins tested. In GC patients, the serum concentrations of all the proteins tested were significantly higher than in healthy subjects. The IL-6, CEA and CA 19-9 levels correlated with nodal metastases, while CRP with tumor stage, gastric wall invasion, presence of nodal and distant metastases. Diagnostic sensitivity of IL-6 was higher (85%) than those of other markers (CRP 66%, CA 19-9 34%, CEA 22%) and increased in combined use with CRP or CEA (88%). The area under ROC curve for IL-6 was larger than those of CRP and classic tumor markers (CEA and CA 19-9). None of the proteins tested was independent prognostic factor for the survival of GC patients. Our findings indicate better usefulness of serum proinflammatory proteins—IL-6 and CRP than classic tumor markers—CEA and CA 19-9 in the diagnosis of GC

Research of active optical barrier

W artykule przedstawiono wybrane wyniki badań techniczno-eksploatacyjnych podzespołów opracowanej aktywnej bariery podczerwieni. Omówiono również: dobór parametrów energetycznych i widmowych oraz czasowych źródła promieniowania laserowego, dobór filtru optycznego fotodetektora, dopasowanie wzmocnienia układu detekcyjnego. Ponadto zamieszczono wyniki badań zakłócającego wpływu promieniowania pochodzącego z różnych typów źródeł, standardowego oświetlenia wewnętrznego, na prawidłowość funkcjonowania bariery.In the article was presented technical and operational research of infrared active barrier. In particular, have been tested: adjustment of energy, spectral and temporal parameters of laser source, selection of optical filter for the photodetector and detector signal amplification. It was also examined distorting effects of the standard internal lighting

Concept of optical active barrier

W artykule przedstawiono opracowany system rekonfigurowalnej bariery optycznej, która składa się z aktywnej bariery laserowej analizującej i sygnalizującej naruszenie jej toru zabezpieczającego dostęp do obszaru chronionego. W celu zachowania standardów bezpieczeństwa wyznaczono parametry widmowe, energetyczne i przestrzenne wiązek promieniowania laserowego wykluczające możliwość wywołania szkodliwych skutków dla ludzi.In the article was presented developed reconfigurable optical barrier system. Active laser barrier analyzes the signals violation of its beam which secures access to the protected area. Spectral, energy and spatial parameters of laser beam was appointed in order to maintain security guarantees. Were excluded the possibility of inducing harmful effects by barrier light on humans

Self-assembly of corrole trimers in solution and at the solid-liquid interface

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