Anatomical retinal reattachment after scleral buckling with and without retinopexy: a pilot study

Purpose: To compare the anatomical results of scleral buckling with and without retinopexy and to assess the effect of retinopexy on the scleral buckling outcome. Methods: This randomized clinical trial was performed on 55 patients. Twenty‐two eyes were treated with scleral buckling (segmental or encircling) with or without drainage of subretinal fluid without any type of retinopexy (group 1); 33 patients received transscleral retinal cryopexy around retinal break(s) in addition to the former procedure. The two groups were matched regarding age, sex, myopia, aphakia, stage of proliferative vitroretinopathy (PVR) and number, type and location of the break(s). Results: In the non‐retinopexy group, 19 patients (86%) had complete retinal reattachment and one patient had partial reattachment after 34–48 months of follow‐up. One patient did not develop attachment because of missed break out of the buckle, and one had no attachment at all because of PVR. Overall success rate was 91% (20 of 22) in this group. In the retinal cryopexy group, 26 patients (79%) had complete retinal reattachment and two had partial reattachment during 35–56 months of follow‐up. In two patients, no attachment was achieved because of missed break out of the buckle; three patients developed redetachment after 1 and 3 months because of PVR. Overall success rate was 85% (28 of 33). The anatomical results in these two groups were the same statistically. Conclusion: With the permanent scleral buckling technique, retinal cryopexy adds no benefit to the success rate of anatomical retinal reattachment.     

Migrainous Prolonged and Reversible Bilateral Inferior Altitudinal Visual Field Defect

Migrainous patients may have visual field deficits at times between migraine attacks that mostly are unilateral and resolve after 7-10 days. Herein, we report a 25-year-old woman, a known case of classic migraine, with bilateral inferior altitudinal visual field defect and complete recovery after 4 months. All lab tests, including brain magnetic resolution imaging and angiography, coagulation tests and visual evoked potentials, were normal.     

A biradical oxo-molybdenum complex containing semiquinone and o-aminophenol benzoxazole-based ligands

We report a new mononuclear molybdenum(iv) complex, MoOL^BISL^SQ, in which L^SQ (2,4-di-tert-butyl o-semibenzoquinone ligand) has been prepared from the reaction of the o-iminosemibenzoquinone form of a tridentate non-innocent benzoxazole ligand, L^BIS, and MoO₂(acac)₂. The complex was characterized by X-ray crystallography, elemental analysis, IR and UV-vis spectroscopy and magnetic susceptibility measurements. The crystal structure of MoOL^BISL^SQ revealed a distorted octahedral geometry around the metal centre, surrounded by one O and two N atoms of L^BIS and two O atoms of L^SQ. The effective magnetic moment (μ_eff) of MoOL^BISL^SQ decreased from 2.36 to 0.2 μ_B in the temperature range of 290 to 2 K, indicating a singlet ground state caused by antiferromagnetic coupling between the metal and ligand centred unpaired electrons. Also, the latter led to the EPR silence of the complex. Cyclic voltammetry (CV) studies indicate both ligand and metal-centered redox processes. MoOL^BISL^SQ was applied as a catalyst for the oxidative cleavage of cyclohexene to adipic acid and selective oxidation of sulfides to sulfones with aqueous hydrogen peroxide.

Biradical molybdenum(iv) complex, MoOL^BISL^SQ, has been prepared from the reaction of the o-iminosemibenzoquinone form of a tridentate non-innocent benzoxazole ligand, L^BIS, and MoO₂(acac)₂ and used as catalyst in oxidation reaction..     

Epidemiologic,clinical, and laboratory characteristics of childhood brucellosis

Wiener Medizinische Wochenschrift - Brucellosis is endemic in Iran. Children constitute 20–25% of cases. We determined clinical, laboratory, and epidemiologic characteristics of pediatric...     

Chiari type capital I, Ukrainian malformation associated with morning glory disc anomaly.

Morning glory disc anomaly (MGDA) is a congenital malformation of the optic disc that has been reported in association with midline craniofacial defects such as basal encephalocele, hypertelorism, cleft lip and palate, and agenesis of the corpus callosum. We describe a 44 year-old woman with MGDA and Chiari type capital I, Ukrainian malformation, an association not previously reported.     

Biradical o-iminobenzosemiquinonato(1−) complexes of nickel(ii): catalytic activity in three-component coupling of aldehydes,amines and alkynes

The six-coordinated bis-o-iminosemiquinone complex, NiL₂^BIS, in which L^BIS is the o-iminosemiquinone 1-electron oxidized form of the tridentate o-aminophenol benzoxazole-based ligand H₂L^BAP, was synthesized and characterized. The crystal structure of the complex reveals octahedral geometry with a NiN₄O₂ coordination sphere in which Ni(ii) has been surrounded by two tridentate L^BIS ligands. This compound exhibits (S_Ni = 1) with both spin and orbital contribution to the magnetic moment and antiferromagnetic coupling between two electrons on two L^BIS ligands which results in a triplet spin ground state (S = 1). The electronic transitions and the electrochemical behavior of this open-shell molecule are presented here, based on experimental observations and theoretical calculations. The electrochemical behavior of NiL₂^BIS was investigated by cyclic voltammetry and indicates ligand-centered redox processes. Three-component coupling of aldehydes, amines and alkynes (A³-coupling) was studied in the presence of the NiL₂^BIS complex, and the previously reported four-coordinated bis-o-iminosemiquinone NiL₂^NIS. Furthermore, among these two o-iminobenzosemiquinonato(1−) complexes of Ni(ii) (NiL₂^NIS and NiL₂^BIS), NiL₂^NIS was found to be an efficient catalyst in A³-coupling at 85 °C under solvent-free conditions and can be recovered and reused for several cycles with a small decrease in activity.

The six-coordinated bis-o-iminosemiquinone complex, NiL₂^BIS, in which L^BIS is the o-iminosemiquinone 1-electron oxidized form of the tridentate o-aminophenol benzoxazole-based ligand H₂L^BAP, was synthesized and characterized.     

Ancillary ligand electro-activity effects towards phenyl acetylene homocoupling reaction by a nickel(ii) complex of a non-innocent O-amino phenol ligand: a mechanistic insight

A new Ni(ii) complex, was synthesized from the reaction of a non-innocent o-aminophenol ligand, and Ni(OAc)₂. The crystal structure of Ni^IIL₂^NIS (in which, IS stands for iminosemiquinone radical ligand with cyanide (shown by N in NIS) substituent on phenolate rings) exhibits the square planar environment of Ni(ii). The complex has been crystalized in the monoclinic system and Ni(ii) was surrounded by two oxygen and two nitrogen atoms of two ligands. Variable-temperature magnetic susceptibility measurement for crystalline samples of complex shows the effective magnetic moment per molecule (μ_eff) of near zero and the diamagnetic nature of the complex (S = 0) which emphasize that strong antiferromagnetic coupling prevailed between the two unpaired electrons of L^NIS ligands and Ni(ii) high spin electrons. The complex is EPR silent which confirms the diamagnetic character of the Ni(ii) complex. Electrochemical measurement (CV) indicates the redox-active character of ligand and metal. Ni^IIL₂^NIS complex proved to be effective for free metal- or base counterpart homocoupling of phenyl acetylene at room temperature. To the best of our knowledge, this is the first example of using Ni(ii) complex without using any reducing agent due to the promotion ancillary effect of non-innocent o-aminophenol ligand which acts as an “electron reservoir” and can reversibly accept and donate electrons in the catalytic cycle. The theoretical calculation confirms the magnetostructure, electronic spectrum and confirmed the suggested mechanism of phenyl acetylene homocoupling with emphasis on the role of non-innocent ligand electro-activity and the effect of ligand substituent on the efficiency and stability of the complex.

A new Ni(ii) complex, was synthesized from the reaction of a non-innocent o-aminophenol ligand, and Ni(OAc)₂.