Verrucous haemangioma

ABSTRACT: A 15 year old boy presented with a verrucous plaque on left leg above the ankle. There was history of bleeding on trauma on several occasion. The lesion was present at birth as an erythematous macule. Histopathological examination established the diagnosis of verrucous haemangioma. Surgical excision has been done

Synthesis, spectroscopic and crystallographic studies on two copper(II) benzimidazole complexes: Supramolecular frameworks built from N-H ... O, N-H ... Cl and O-H ... Cl hydrogen bonds

858-863The tridentate ligands 2,6-bis(benzimidazole-2'-yl)pyridine (L1) and N,N-bis(benzimidazole-2'-yl-methyl )amine (L2) with N3 donor set form the corresponding mononuclear [Cu (L1)(ClO4)(Cl)].H2O (1) and [Cu (L2)(ClO4)(Cl)].H2O (2) complexes, which have been characterized by elemental analysis. UV-Vis spectra, IR , EPR and magnetic moment studies. Single crystal X-ray structure studies for both the complexes show that coordination geometrics around the copper centre are best described as distorted square pyramidal with three nitrogen atoms of tridentatc ligand and a chloride ion defining the equatoriial planes. The apical positions in the complexes are occupied by a perchlorate O atom in 1 and a chloride ion in 2. Metal directed assembly of infinite two-dimensional supramolecular network stabilizes the crystal structures of both complexes in the solid state. The global magnetic interactions in complexes 1 and 2 are found to be paramagnetic with μeff values of 1.65 BM and 1.63BM, respectively, which are typical for a Cu(II) d9 system

Picosecond laser texturization of mc-silicon for photovoltaics: A comparison between 1064 nm, 532 nm and 355 nm radiation wavelengths

tSelf-organized surface structures were produced by picosecond laser pulses on multi-crystalline siliconfor photovoltaic applications. Three different laser wavelengths were employed (i.e. 1064 nm, 532 nmand 355 nm) and the resulting morphologies were observed to effectively reduce the reflectivity of thesamples after laser irradiation. Besides, a comparative study of the laser induced subsurface damage gen-erated by the three different wavelengths was performed by confocal micro-Raman, photoluminescenceand transmission electron microscopy. The results of both the structural and optical characterizationshowed that the mc-Si texturing performed with the laser at 355 nm provides surface reflectivity between11% and 8% over the spectral range from 400 nm to 1 �m, while inducing the lowest subsurface damage,located above the depletion region of the p–n junction