Chemistry of Gold(III) with a Pyridine-Oxaziridine Ligand: Competition between C-O and N-O bond Activation.

The oxaziridine derivative 2-t-butyl-3-(2-pyridinyl)oxaziridine reacted with Na[AuCl ].2H O to give, after recrystallization from a solvent mixture containing methanol, a mixture of gold(III) complexes which were characterized crystallographically as the amide complex [AuCl {κ -N,N'-2-C H NC(=O)N(t-Bu)] and the aldolate complex [AuCl {κ -N,O-2-C H NCH(OMe)O)]. It is suggested that these products arise after initial O-N or C-N bond cleavage respectively of the strained oxaziridine ring, after coordination to the gold(III) center.

The 10th Costal Cartilage Graft in Secondary Cleft Rhinoplasty-A Versatile Rib.

Autologous costal cartilage for rhinoplasty is an excellent graft material providing both volume and quality of cartilage required for nasal reconstruction. Commonly, the 5th, 6th, 7th, and 8th rib costal cartilages have been harvested but other ribs such as the 10th rib are often overlooked and yet offer an excellent graft option for columellar, alar rim, nasal tip, and dorsal augmentation grafts. The use of the 10th rib costal cartilage in patients with complex secondary cleft nasal deformity has scant reference in the literature.

Impact of Smoking on COVID-19 Symptoms in Non-Vaccinated Patients: A Matched Observational Study from Qatar.

Purpose: Predisposition to acute illness from COVID-19 is suggested to correlate with cigarette smoking as it augments the risk of developing cardiovascular and respiratory illnesses, including infections. However, the effects of smoking on COVID-19 symptoms are not well described and controversial. In this study, we aim to explore the associations between smoking and COVID-19 symptoms.

Difluprednate 0.05% versus Prednisolone Acetate Post-Phacoemulsification for Inflammation and Pain: An Efficacy and Safety Clinical Trial.

Background: The purpose of this study was to compare the efficacy and safety of difluprednate 0.05% (PRO-145) versus prednisolone acetate 1% (Prednefrin SF), for management of postoperative inflammation and pain, after cataract surgery.

Methods: This was a Phase III, multicenter, prospective, double-blind, clinical trial.

Combined correction of the nasal tip and upper lip in bilateral cleft lip patients: A novel approach.

Secondary nasal deformity in bilateral cleft lip is one of the great surgical challenges. The problems are an under projected tip, an infra-tip lobule merging with the pro-labium and a short columella. Upper lip vermillion border deformity is a further significant problem.

Aberrant temporal branch of facial nerve.

There is a high risk of injury to the temporal branch of the facial nerve during operations on the head and neck because of the complexity of its course. We report an aberrant branch that arose from the main trunk before bifurcation into the temporofacial and cervicofacial divisions. It had no anastomosis with other branches, and damage could have caused uncompensated injury.

Serum magnesium, iron and ferritin levels in patients with diabetic retinopathy attending Makkah Eye Complex, Khartoum, Sudan.

Diabetic retinopathy is the most common complications of diabetes mellitus that, in most occasions, lead to blindness. Multiple evidences linked the serum magnesium, iron and ferritin disturbance with diabetes and its complications. A case-control study was conducted at Makkah Eye Complex, Khartoum, Sudan, to compare the levels of serum magnesium, iron and ferritin in patients with diabetic retinopathy with diabetic patients without diabetic retinopathy (controls).

A versatile diphosphine ligand: cis and trans chelation or bridging, with self association through hydrogen bonding.

The diphosphine ligand, N,N'-bis(2-diphenylphosphinoethyl)isophthalamide, dpipa, contains two amide groups and can form cis or trans chelate complexes or cis,cis or trans,trans bridged complexes. The amide groups are likely to be involved in intramolecular or intermolecular hydrogen bonding. This combination of properties of the ligand dpipa leads to very unusual structural properties of its complexes, which often exist as mixtures of monomers and dimers in solution.

Oral and pharyngeal cancer among the Arab population in Israel from 1970 to 2006.

Background: Israeli Arabs are considered as a developing society characterized by poverty and high levels of smoking among men. The purpose of this study was to describe their incidence, mortality and survival rates for oral and pharyngeal cancer between the years 1970-2006. Studies such as this in the Arab world, where the population is almost the same as the Arab population in Israel, are rare.

Seroprevalence of cytomegalovirus and rubella among pregnant women in western Sudan.

Background: Maternal cytomegalovirus (CMV) and rubella infections have adverse neonatal outcomes. Basic epidemiological data concerning CMV and rubella is necessary for health planners and care providers.

Methods: A cross sectional study was conducted at El-Rahad hospital, Sudan to investigate seroprevalence of CMV and rubella infections and associated possible risk factors among pregnant women.

Self-assembled polymers of silver(I) with a chiral diphosphine ligand.

Silver(I) salts, AgX, form self-assembled polymers with the chiral diphosphine ligand R,R-trans-C(6)H(10)(NHCO-2-C(6)H(4)PPh(2))(2), 1, of formula {Ag(2)X(2)(μ-1)}(n) and ring-opening polymerization of the trans chelate complex [Ag(1)]X has given the helical polymer [{Ag(μ-1)}(n)]X(n), when X = CF(3)SO(3).

Effect of resin coating and occlusal loading on microleakage of Class II computer-aided design/computer-aided manufacturing fabricated ceramic restorations: a confocal microscopic study.

Objective: To evaluate the effect of resin coating and occlusal loading on microleakage of class II computer-aided design/computer-aided manufacturing (CAD/CAM) ceramic restorations.

Material And Methods: Molars were prepared for an mesio-occlusal-distal (MOD) inlay and were divided into two groups: non-coated (controls); and resin-coated, in which the cavity was coated with a combination of a dentin bonding system (Clearfil Protect Bond) and a flowable resin composite (Clearfil Majesty Flow). Ceramic inlays were fabricated using the CAD/CAM technique (CEREC 3) and cemented with resin cement (Clearfil Esthetic Cement).

A chiral diphosphine as trans-chelate ligand and its relevance to catalysis.

The chiral diphosphine ligand R,R-trans-1,2-C(6)H(10)(NHCOC(6)H(4)PPh(2))(2), 1, gives the fluxional trans-chelate complexes [M(1)]X, 2a-2c, M = Au or Ag. It is suggested that a similar trans-chelate conformation may be present in the catalytic intermediate [Pd(1)].

Effect of resin coating on adhesion and microleakage of computer-aided design/computer-aided manufacturing fabricated all-ceramic crowns after occlusal loading: a laboratory study.

This study investigated the effect of resin coating and occlusal loading on adhesion and microleakage of all-ceramic crowns. Molars were prepared for an all-ceramic crown and were divided into two groups: non-coated (control) and resin-coated with Clearfil Tri-S Bond. Crowns were fabricated using CEREC 3 and cemented using Clearfil Esthetic Cement.

Accent method of voice therapy for treatment of severe muscle tension dysphonia.

Nonorganic dysphonia may present a challenging diagnosis, and management. Here, we present a severe form of nonorganic dysphonia, which we termed as arytenoidal dysphonia. It was a severe form of muscle tension dysphonia, which was described earlier in literature although with different nomenclature.