Underwriters and the Broken Chinese Wall: Institutional Holdings and Post-IPO Securities Litigation

We examine whether underwriters have an information advantage over other institutional investors in new public companies. Focusing on firms targeted by IPO‐related class action litigation and a matched sample of nonsued firms, we find evidence suggesting that lead underwriters retain an information advantage in the firms they take public and that they capitalize on this information by closing out or reducing their holdings in sued firms prior to the eventual litigation date. An examination of analyst opinions suggests that analysts affiliated with lead underwriters are reluctant to reduce their earnings forecasts or downgrade sued firms before the litigation date

The Investigation of Removing Direct Blue 15 Dye from Wastewater Using Magnetic Luffa sponge NPs

In this study, loaded Luffa sponge membrane forms were modified with ZnO, Fe3O4, ZnO/Fe3O4 nanoparticles (NPs) to remove of Direct Blue 15 (DB15), which is a carcinogenic azo dye in aqueous solution. ZnO and Fe3O4 NPs were synthesized using purified peroxidase enzymes from Euphorbia amygdaloides using green synthesis method. Adsorption of DB15 azo dyes was separately studied with membrane forms (LS-pure, LS-ZnO, LS-Fe3O4, and LS-ZnO/Fe3O4). Optimum contact time, optimum pH, optimum temperature, optimum dye concentration, and optimum LS amount were found as 45 min, pH 8.0, 20°C, 200 mg/L, and 0.025 g in line with the optimization studies, respectively. The obtained membrane forms were characterized using SEM, FT-IR, and XRD techniques. According to obtained results, NPs loaded LS membrane forms are promising in removal of DB15 from textile wastewater contaminated water

Pediatric Posttraumatic Cystic Bone Lesion

4-year-old girl presented to emergency department with left wrist pain after trauma. Radiographs demonstrated a torus fracture of the distal radius. At the third month following the trauma, a control radiograph is obtained. In the radiograph, a radiolucent lesion close to the former torus fracture site is noticed (Figure 2). Then, CT is performed for further examination (Figure 3). CT demonstrated cortical, well-circumscribed non-expansile subcentimeter lesion

Reorganization of Beaming in Ecological Perspective

The principal aim of the leather industry, which plays a significant role in today’s global economy, is to transform animal hides/skins into a physically and chemically stable material by subjecting them to chemical and mechanical processes. Leather processings involved in isolation in beamhouse processes generate large volumes of solid wastes and high loaded wastewater which are major source of environmental pollution characterized by chemical oxygen demand (COD), biological oxygen demand (BOD), total dissolved solids (TDS), total suspended solids (TSS), chromium (III) and phenolics with high pH, strong odor and dark brown color. In our study, the best practices modelling and eco-compatible process shifts were the objectives for the decrement in high pollution load of large effluent portion for leather industry. Soaking, immunization and liming processes were carried out with reductive chemical additives and surfactants, fibre opening auxiliaries, enzyme based and enzyme assisted chemicals in the factories as an eco-friendly designed recipe. The results revealed the advantages of time saving, cost effectivity, minimized pollution load and quality enhancement in limed pelts compared to conventional process

The Assessment of Knowledge, Behaviors, and Anxiety Levels of the Orthodontists about COVID-19 Pandemic

Objective:A new viral disease called Coronavirus disease-19 (COVID-19) affected the whole world because of its characteristics of spreading rapidly via respiratory droplets and aerosol. As one of the most aerosol-generating occupations, dentists are at high risk and are recommended to treat emergency cases only. We aimed to assess the general knowledge, emergencies, personal precautions, and avoided behaviors among the orthodontists and also their anxiety levels, during COVID-19.Methods:A survey research, including demographic information, general knowledge about COVID-19, treatment strategies, protective measures, and Generalized Anxiety Disorder (GAD) 7 test, was conducted via a web-based questionnaire (1 open-ended and 26 closed-ended questions). A total of 215 orthodontists older than 20 years of age and practicing in different regions of Turkey were included in this study. The answers received within the first 10 days were included.Results:Most of the orthodontists were aware of COVID-19 symptoms and transmission routes (n=159 and n=183, respectively). Almost all of them treated only emergency cases (n=209). Orthodontic emergencies were reported mostly as injury due to band/bracket failure, soft/hard tissue trauma, and problems in retention appliances (n=197, n=186, and n=81, respectively). The participants also avoided aerosol-generating procedures and used transmission-based protective equipment. The prevalence of GAD was 16.7% during COVID-19, and there was no statistically significant difference when it was stratified by gender, age, city, and COVID-19 related questions (p>0.05).Conclusion:The orthodontists followed the guidelines and took protective measures during COVID-19, and the majority had subthreshold anxiety levels

Assessment of the Diagnostic Skills of General Dentists in Different Types of Orthodontic Malocclusions

Objective: One of the biggest problems in publicly funded dental clinics is the patient waiting list. The appropriate referral plays a key role in avoiding an increase in the number of patients on this waiting list. This study aimed to assess general dentists’ diagnostic skills and approaches for different malocclusions.Methods: A questionnaire was prepared using photos of 8 patients previously treated for different malocclusions. One hundred twenty general dentists (83 female, mean age: 24 ± 1.18 years; 37 male, mean age: 24 ± 1.95 years) participated in the survey and were asked to decide whether the patient needed orthodontic treatment or orthognathic surgery, and to provide the reason for surgery (irregular teeth, or both unesthetic profile and irregular teeth), and the cause of the unesthetic profile (mandibular protrusion, mandibular retrusion, maxillary protrusion, maxillary retrusion).Results: The answers suggesting the need for orthodontic treatment were significantly higher for all malocclusions except for the Class II camouflage case. Of the Class III cases, the general dentists chose orthognathic surgery for both surgery and facemask cases (93.1%, 66.4% respectively). For the severe open bite case, orthognathic surgery was chosen with a ratio of 81.2%, and orthognathic surgery was decided as not necessary for the mild open bite case (74.8%). Among the surgery cases, mandibular retrusion for the Class II case (94.6%), mandibular protrusion for Class III case (95.4%), and maxillary retrusion for the severe open bite case (44.6%) were the maximum reported reasons.Conclusion: The distinction between camouflage and surgical treatment was better made by dentists in Class II and open bite cases than in Class III cases

DISSIMILAR VACUUM BRAZING OF ADDITIVE MANUFACTURED 17-4PH STAINLESS STEEL TO CONVENTIONAL 304 AND 17-4 STAINLESS STEEL BY BNI-2 BRAZING FILLER MATERIAL

Vacuum brazing process of 17-4PH stainless steel, which was manufactured using additive manufacturing, as well as conventional AISI304 and 17-4PH stainless steel alloys was investigated. The brazing process was conducted at 1050°C for 20 minutes under 10-6 Torr, using BNi-2 filler material. Various aspects of the vacuum brazed parts were analyzed, including their microstructure, wetting behavior and mechanical strength. To evaluate the wetting behavior, the contact angle and wetted area were measured using optical microscopy. The microstructures were examined using Scanning Electron Microscopy and Energy Dispersive Spectroscopy techniques. Additionally, tensile testing was performed on the joints to assess the influence of surface roughness and brazing of different materials on the strength of the brazed parts.Mechanical Engineerin