Ovartorsion nach In-vitro-Fertilisation

Zusammenfassung: Das Risiko für das Auftreten einer Adnextorsion nach einer IVF-Behandlung wird auf ca. 0,1% geschätzt. Aufgrund der Seltenheit und des initial oft unauffälligen sonographischen Befundes wird eine Adnextorsion oft fehldiagnostiziert und die Behandlung verzögert. Die einzige effektive Therapie ist eine sofortige Laparoskopie, Retorsion und Verkleinerung des Ovar

Diversity Assessment of Floral Species and Screening of Potential Nickel Hyperaccumulator in Nickel-Rich Kinalablaban Delta, Cagdianao, Claver, Surigao del Norte, Philippines

The study was conducted to determine the status of floral diversity and screen plant species that has the potential to accumulate nickel in the nickel-rich Kinalablaban Delta located in Claver, Surigao del Norte. Fifty-nine (59) species of plants belonging to thirty-seven (37) families were found. The most represented families were Poaceae, Moraceae, and Fabaceae. These were families generally encountered anywhere and can be found in areas undergoing ecological succession. Notable species observed were Imperata cylindrica and Saccharum spontaneum in which these species were widely distributed all throughout the delta. Rhizophora sp. was also found since they are intentionally planted by the adjacent mining firm as part their environmental protection and management plan. The diversity, dominance and evenness were low indicating a need to enhance the vegetation in the delta. Out of the 59 species identified, only four species tested positive as potential nickel hyperaccumulator including Ardisia elliptica, Premna odorata, Phyllantus securinegoides and Phyllantus sp. These plant species however, must be tested further if it is indeed a nickel hyperaccumulator. Keywords: flora, ultramafic, hyperaccumulator, nickel minin

Fractal characterisation of electrodispersed gold electrodes

The fractal dimension of the surface, Ds, of thin columnar gold electrodeposits (surface roughness factor 50–100) grown on gold wire cathodes by electroreducing hydrous gold oxide layers has been determined by measuring the diffusion controlled current of the Fe(CN)4−6/Fe(CN)3−6 reaction. The diffusion current (I) vs. time (t) relationships obeyed a Iαt−α dependence with Ds = 2α + 1. The initial Ds, value is 2.5 ± 0.1, and decreases to 2.3 ± 0.1 by keeping the deposit in contact with the electrolyte solution at 298 K due to the smoothing of the rough metal surface by surface diffusion.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasFacultad de Ciencias Exacta

Fractal characterisation of electrodispersed gold electrodes

The fractal dimension of the surface, Ds, of thin columnar gold electrodeposits (surface roughness factor 50–100) grown on gold wire cathodes by electroreducing hydrous gold oxide layers has been determined by measuring the diffusion controlled current of the Fe(CN)4−6/Fe(CN)3−6 reaction. The diffusion current (I) vs. time (t) relationships obeyed a Iαt−α dependence with Ds = 2α + 1. The initial Ds, value is 2.5 ± 0.1, and decreases to 2.3 ± 0.1 by keeping the deposit in contact with the electrolyte solution at 298 K due to the smoothing of the rough metal surface by surface diffusion.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasFacultad de Ciencias Exacta

Early stages of platinum electrodeposition on highly oriented pyrolytic graphite: scanning tunneling microscopy imaging and reaction pathway

The early stages of Pt electrodeposition (0.675-0.620 V vs RHE) on highly oriented pyrolytic graphite (HOPG) from chloroplatinic acid at 25 °C have been studied by ex-situ STM and SEM imaging complemented with electrochemical data. Nucleation and 3D growth of Pt initiate at HOPG surface defects. Large Pt agglomerates containing flat crystallites with well-defined geometries are found around HOPG steps. Pt crystallites formed by 1-2 nm size clusters become more compact as the electrodeposition potential is shifted negatively or the Pt electrodeposited charge is increased. High-resolution STM imaging reveals large uncovered HOPG areas with the nearest-neighbor C-C distance d = 0.24 ± 0.02 nm and fiat hexagonal Pt crystallites. Electrochemical data combined with STM imaging can be interpreted in terms of a diffusion-controlled Pt(IV) to Pt(II) reaction at HOPG and a surface reaction leading to Pt(0) at HOPG defects.Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)Facultad de Ciencias Exacta

Early stages of platinum electrodeposition on highly oriented pyrolytic graphite: scanning tunneling microscopy imaging and reaction pathway

The early stages of Pt electrodeposition (0.675-0.620 V vs RHE) on highly oriented pyrolytic graphite (HOPG) from chloroplatinic acid at 25 °C have been studied by ex-situ STM and SEM imaging complemented with electrochemical data. Nucleation and 3D growth of Pt initiate at HOPG surface defects. Large Pt agglomerates containing flat crystallites with well-defined geometries are found around HOPG steps. Pt crystallites formed by 1-2 nm size clusters become more compact as the electrodeposition potential is shifted negatively or the Pt electrodeposited charge is increased. High-resolution STM imaging reveals large uncovered HOPG areas with the nearest-neighbor C-C distance d = 0.24 ± 0.02 nm and fiat hexagonal Pt crystallites. Electrochemical data combined with STM imaging can be interpreted in terms of a diffusion-controlled Pt(IV) to Pt(II) reaction at HOPG and a surface reaction leading to Pt(0) at HOPG defects.Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)Facultad de Ciencias Exacta

Fractal characterisation of electrodispersed gold electrodes

The fractal dimension of the surface, Ds, of thin columnar gold electrodeposits (surface roughness factor 50–100) grown on gold wire cathodes by electroreducing hydrous gold oxide layers has been determined by measuring the diffusion controlled current of the Fe(CN)4−6/Fe(CN)3−6 reaction. The diffusion current (I) vs. time (t) relationships obeyed a Iαt−α dependence with Ds = 2α + 1. The initial Ds, value is 2.5 ± 0.1, and decreases to 2.3 ± 0.1 by keeping the deposit in contact with the electrolyte solution at 298 K due to the smoothing of the rough metal surface by surface diffusion.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasFacultad de Ciencias Exacta