Alloy formation by mg under-potential deposition on al from nitrate melts

Magnesium was underpotentially deposited on aluminium electrodes from magnesium nitrate-ammonium nitrate melts at temperatures ranging from 390 to 500 K. The electrochemical techniques used were linear sweep voltammetry and potential step. Electrodes were studied by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). It was found that reduction processes of nitrate, nitrite and water (when present), in the underpotential range studied, took part simultaneously with magnesium underpotential deposition. Consequently, magnesium UPD reduction and stripping voltammetry peaks were not pronounced and well defined. Nevertheless, EDS, EDX and XRD measurements showed evidence of Mg2Al3, MgAl2 and Al12Mg17 alloys formed by underpotential deposition of magnesium onto aluminium substrate

Magnesium underpotential deposition from nitrate melts and alloy formation with platinum substrate

This paper investigates magnesium underpotential deposition on platinum electrodes from magnesium nitrate-ammonium nitrate melts at temperatures ranging from 400 to 500 K. Electrochemical techniques used were linear sweep voltammetry and potential step. Electrode surfaces were studied by Scanning electron microscopy (SEM), Atomic force microscopy (AFM), Energy dispersive spectrometry (EDS), energy dispersive X-Ray spectroscopy (EDX) and X-Ray diffraction (XRD). In the underpotential range studied, it was found that magnesium underpotential deposition took part simultaneously with reduction processes of nitrate and nitrite. EDS and XRD measurements showed clear evidence of MgPt3, Mg3Pt alloys being formed

Alloy formation by underpotential deposition of Mg on Al from nitrate melts

Magnesium has been underpotentially deposited on aluminium electrodes from magnesium nitrate and magnesium nitrate-ammonium nitrate melts at temperatures ranging from 85oC to 200oC. Electrochemical techniques used were cyclic voltammetry and potential step. Deposits were studied by electron microscopy, EDS and XRD. In the magnesium UPD region on Al the processes of nitrate, nitrite and water (when present) reductions take part simultaneously with magnesium UPD. The underpotential deposition of magnesium leads to Al3Mg2, Mg2Al3 i Al12Mg17 alloys formation

Eozinofilna upala u alergijskom rinitisu i nosnoj polipozi

On histopathological examination, nasal polyps and nasal mucosa in allergic rhinitis show different forms of pseudostratified respiratory epithelium, whereas the dominant characteristic of lamina propria is an eosinophilic infiltration. The aim of this study was to compare interleukin (IL)-5 and eosinophilic cationic protein (ECP) levels in the nasal fluid of 42 patients: 12 with allergic rhinitis and nasal septal deviation, 17 non-atopic patients with nasal polyposis, and 13 atopic nasal polyp patients were enrolled in this cross-sectional study. Nasal secretion samples were collected a few days before surgery. The levels of IL-5 were measured using fl ow cytometry and the ECP using a commercial ELISA kit. In addition, we counted eosinophils in hematoxylin-and-eosin-stained sections of all nasal polyp and all nasal mucosa samples taken from the inferior nasal turbinates during septoplasty. A significantly higher concentration of IL-5 was found in the nasal fluid of atopic patients with nasal polyposis than in non-atopic nasal polyp patients (p=0.025) and patients with allergic rhinitis (p=0.05). ECP was higher in atopic nasal polyp patients than in patients with allergic rhinitis (p<0.0001) and than in non-atopic nasal polyp patients (p<0.0001). Polyp eosinophils were higher in atopic’ than in non-atopic patients (p<0.0001) and higher than in the mucosa of patients with allergic rhinitis (p<0.0001). These however had signifi cantly more mucosal eosinophils than was found in the polyps of non-atopic patients’ (p=0.025). ECP levels in nasal fl uid and eosinophil counts in tissue specimens correlated well in all three groups of patients. Our study has shown that atopic nasal polyp patients have a higher level of eosinophilic inflammation than non-atopic patients with nasal polyps and patients with allergic rhinitis.Na histopatološkim pregledima nosni polipi, kao i nosna sluznica u alergijskom rinitisu pokazuju različite oblike pseudoslojevitog respiracijskog epitela, dok je osnovna karakteristika lamine proprije infiltracija eozinofilima. Cilj ove studije bio je usporediti koncentracije interleukina 5 (IL-5) i eozinofilnoga kationskog proteina (ECP) u nosnome sekretu pacijenata s alergijskim rinitisom, neatopičnih i atopičnih pacijenata s nosnom polipozom, kao i usporediti broj eozinofi la u tkivu nosnih polipa/nosne sluznice ovih pacijenata. Četrdeset dvoje (n=42) pacijenata, 12-ero s alergijskim rinitisom i devijacijom nosnog septuma, 17-ero neatopičnih pacijenata s nosnom polipozom i 13-ero atopičnih pacijenata s nosnom polipozom bilo je uključeno u ovu presječnu studiju. Uzorci nosnog sekreta bili su skupljeni iz nosnih šupljina svih ispitanika nekoliko dana prije kirurškog liječenja. Koncentracije IL-5 mjerene su metodom protočne citometrije, dok su koncentracije ECP mjerene komercijalnim ELISA-kitom. Eozinofi li su brojeni u svim uzorcima tkiva nosnih polipa, kao i u svim uzorcima tkiva sluznice uzetih s donje nosne školjke tijekom septoplastike. Značajno više koncentracije IL-5 izmjerene su u nosnom sekretu atopičnih pacijenata s nosnom polipozom u usporedbi s neatopičnim pacijentima s nosnom polipozom (p=0,025) i pacijentima s alergijskim rinitisom (p=0,05). Naši su rezultati pokazali više koncentracije ECP u atopičnih pacijenata s nosnom polipozom nego u pacijenata s alergijskim rinitisom (p<0,0001) i u usporedbi s nealergičnim pacijentima s nosnom polipozom (p<0,0001). Veći broj eozinofi la izbrojen je u tkivu polipa atopičnih pacijenata nego u tkivu polipa neatopičnih pacijenata (p<0,0001), kao i u sluznici pacijenata s alergijskim rinitisom (p<0,0001). U nosnoj sluznici pacijenata s alergijskim rinitisom našli smo značajno veći broj eozinofila nego u polipima neatopičnih pacijenata s nosnim polipima (p=0,025). Konačno, našli smo pozitivnu korelaciju između nivoa ECP u nosnom sekretu i broja eozinofila u uzorcima tkiva u sve tri skupine ispitanika. Zaključili smo da atopični pacijenti s nosnom polipozom imaju viši stupanj eozinofilne upale u usporedbi s neatopičnim pacijentima s nosnim polipima i s pacijentima s alergijskim rinitisom

Gastrointestinal stromal tumors stomach cese

Gastrointestinal stromal tumors (GIST omi) are a heterogeneous group of mesenchymal tumors. Etiological factors that cause GIST ome are not clearly distinguished, characterized by remarkable diversity of the clinical, histopathological and genetic features. Mitotic activity, nuclear pleomorphism, degree of cellularity, nuclear-cytoplasmic ratio, tumor size, mucosal invasion, tumor ulceration and necrosis, are factors that determine the malignancy of these tumors. The most common location of these tumors of the stomach and small intestine, while very rare localization of the colon, esophagus and rectum. Despite the progress that has been made in the diagnosis and further diagnosis of intra - or postoperative. The aim of this report is to contribute to easier recognizing the symptoms, diagnosis and treatment of these tumors. It was a mixed tumor, epitheloid-spindle type cells, immunohistochemical analysis, we have a positive expression of CD 117 and CD 34