Результаты поиска

Response of the mouse lung transcriptome to welding fume: effects of stainless and mild steel fumes on lung gene expression in A/J and C57BL/6J mice.

BACKGROUND: Debate exists as to whether welding fume is carcinogenic, but epidemiological evidence suggests that welders are an at risk population for the development of lung cancer. Recently, we found that exposure to welding fume caused an acutely greater and prolonged lung inflammatory response in lung tumor susceptible A/J versus resistant C57BL/6J (B6) mice and a trend for increased tumor incidence after stainless steel (SS) fume exposure. Here, our objective was to examine potential strain-dependent differences in the regulation and resolution of the lung inflammatory response induced by…

DFT, MC, and MD investigation of H₂MoO₄ adsorption on model AISI 304 stainless steel surfaces: effects of inhibitor loading, temperature, and confined shear.

CONTEXT: Molybdate-based inhibitors are promising candidates for corrosion protection of stainless steels; however, the molecular mechanisms controlling their adsorption behavior under different interfacial conditions remain insufficiently understood. This study investigates the adsorption behavior of H₂MoO₄ on model surfaces relevant to AISI 304 stainless steel, focusing on the effects of inhibitor loading, temperature, and confined shear. Electronic-structure analysis revealed that oxygen-containing regions act as electron-donating sites, whereas the Mo-centered region exhibits electron-acce…

Synthesis of hydroxyl-rich covalent organic framework-coated stainless steel fiber for efficient solid-phase microextraction of psychiatric drugs from water and milk samples.

The increasing misuse of psychiatric drugs has led to their emergence as environmental contaminants in water and food matrices, raising public health concerns. In this study, a hydroxyl-rich covalent organic framework (Py-DHBD-COF) was solvothermally synthesized and coated onto a stainless steel fiber for use in direct-immersion solid-phase microextraction (DI-SPME). The fabricated fiber was employed to extract psychiatric drugs from environmental water and pretreated milk extracts, followed by analysis using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). The hyd…

A 12-month prospective randomized controlled comparative evaluation of clinical success of esthetic flexible crowns with stainless steel crowns in primary mandibular molar teeth.

OBJECTIVE: To compare the clinical success of esthetic flexible crowns with stainless steel crowns (SSCs) in primary molars over 12 months. METHOD AND MATERIALS: In this randomized split-mouth pilot study, 30 children each received one SSC and one esthetic flexible crown. Clinical parameters were evaluated using modified USPHS Ryge criteria at baseline, 1 week, 1 month, 3 months, 6 months, and 12 months. Procedural time was recorded, and parental satisfaction was assessed at 12 months. RESULTS: Based on Ryge criteria, SSCs showed significantly better resistance to staining and superior surfa…

Коррозионное поведение Incoloy_800H, Hasteloy ¶G35> и 316L бесшовной стали в смеси фтористых молотков FLINAK и ее паров

Данная статья рассматривает результаты эксперимента по коррозии, который исследует переходную зону между нижней и верхней областями образца. В этом эксперименте нижняя половина поверхности образца подвергается воздействию расплавленной соли, а верхняя половина поверхности образца подвергается воздействию паров, генерируемых расплавленной солью FLiNak. Для коррозионного эксперимента были выбраны сплавы Incoloy®800H и Hastelloy®G35® и нержавеющая сталь 316L на основе их содержания хрома. Эксперимент был проведен при температуре 600 °C в течение 100 часов. Результаты эксперимента показывают, что

Совпадение в аннотации оригинала
This paper discusses the findings of a corrosion experiment which investigates a transition area which is between the lower area and upper a … osed to the vapors generated by molten FLiNak salt. Incoloy®800H and Hastelloy®G35® alloys and 316L stainless steel were selected for the corrosion experiment on the basis of their Cr content. The experiment was conducted at 600 °C for a period of 100 h. The results of the experiment show that, in the transition area, no abrupt change in corrosion mechanism takes …

Thermally constructed stable Zn-doped NiCoOx-z alloy structures on stainless steel mesh for efficient hydrogen production via overall hydrazine splitting in alkaline electrolyte.

Hydrogen has a high energy density of approximately 120 to 140 MJ kg-1, which is very high compared to other natural energy sources. However … Here, we prepared oxygen-deficient zinc-doped nickel cobalt oxide (Zn-NiCoOx-z) alloy nanoarrays on stainless steel mesh (SSM) using a hydrothermal synthesis method followed by thermal treatment. Furthermore, the prepared thin films were used as electrocatalysts, and the OER and hydrazine oxidation reaction (HzOR) activities were investigated in three- and two-el …

Effects of Mode Mixity and Loading Rate on Fracture Behavior of Cracked Thin-Walled 304L Stainless Steel Sheets with Large Non-Linear Plastic Deformation.

This study investigates the mixed-mode I/II fracture behavior of O-notched diagonally loaded square plate (DLSP) samples containing an edge crack within the O-notch. This investigation aims to explore the combined effects of loading rate and mode mixity on the fracture properties of steel 304L, utilizing DLSP samples. The DLSP samples, made from strain-hardening steel 304L, were tested at three different loading rates: 1, 50, and 400 mm/min, covering five mode mixities from pure mode I to pure mode II. Additionally, tensile tests were performed on dumbbell-shaped specimens at the same loading

Application of a fluorescent dual stain to assess decontamination of tissue protein and prion amyloid from surgical stainless steel during simulated washer-disinfector cycles.

Current World Health Organization guidelines pertaining to the reprocessing of surgical instruments in the face of potential iatrogenic transmission of Creutzfeldt-Jakob disease (iCJD) are incompatible for the vast majority of devices. This has led to the advent of a range of new decontamination measures. Even without the implementation of these new procedures, the incidence of proven iCJD through surgery remains low. In this study, existing decontamination processes in sterile service departments have been evaluated using simulated washer-disinfector cycles on surgical grade stainless steel w…

Assessing the feasibility of a stainless-steel lingual fixed retainer on mandibular anterior dentition with orthodontic-related labiolingual alveolar bone resorption: A finite element analysis.

OBJECTIVE: This study aimed to evaluate the use of a stainless-steel fixed retainer for post-orthodontic retention in patients with labiolingual alveolar bone resorption in the mandibular anterior segment. METHODS: Three mandibular anterior segment models (with or without labial or lingual alveolar bone resorption) with 0.5-mm-diameter retainers bonded to all teeth were constructed. Two occlusion schemes were simulated: a 285.3 N force applied to four mandibular incisors (incisor biting) and a 93 N force applied to the left canine (laterotrusion). The tooth displacement and stress distributio

Associated injury complicated by pediatric lower limb shaft fractures and clinical efficacy of flexible stainless-steel intramedullary nailing in children less than 15 years old.

Although pediatric lower limb shaft fractures are common, little is known about associated injuries. The purpose of this study was to examine associated injuries complicated by pediatric lower limb shaft fractures and the efficacy of surgical treatment using a flexible stainless-steel intramedullary Ender nail in children less than 15 years old. This is a retrospective review of 29 children younger than 15 years old who were diagnosed with femoral or tibial shaft fractures and treated using Ender nails from 2005 to 2016. Baseline data, etiology, associated injuries, fracture site and patterns,

Immobilization of heparin/poly-l-lysine microspheres on medical grade high nitrogen nickel-free austenitic stainless steel surface to improve the biocompatibility and suppress thrombosis.

Thrombosis formation, restenosis, and delayed endothelium regeneration continue to be a challenge for coronary artery stent therapy. To improve the hemocompatibility of cardiovascular implants and to selectively direct vascular cell behavior, a novel heparin/poly-l-lysine microsphere was developed and immobilized on a dopamine-coated surface. We chose medical grade high nitrogen nickel-free austenitic stainless steel as the stent material since it has better biocompatibility. The stability and structural characteristics of the microspheres changed with the heparin: poly-l-lysine concentration …

Comparison of functional outcome after volar plate fixation with 2.4-mm titanium versus 3.5-mm stainless-steel plate for extra-articular fracture of distal radius.

PURPOSE: Open reduction and locked volar plate and screw fixation is a popular treatment method for extra-articular distal radius fractures with dorsal metaphyseal comminution. In this study, we compared the use of a titanium 2.4-mm precontoured plate with that of a stainless-steel oblique 3.5-mm T-shaped plate to test the null hypothesis that there would be no difference in wrist function or upper extremity-specific health status in the internal fixation of AO-type A3.2 distal radius fractures. METHODS: We retrospectively analyzed 24 patients treated with a 2.4-mm titanium plate and 38 patie

[Multiload Cu250 intrauterine devices and VCu200 intrauterine devices for women with previous failure of stainless steel ring intrauterine devices: a 5-year randomized clinical trial].

Two hundred rural women with history of stainless steel ring (SSR) intrauterine devices (IUD) failure (i.e. expulsion or pregnancy with IUD-in-situ) were randomly allocated into Multiload Cu250 (MLCu250) or VCu200 group. The follow up rate was 97.5% at the end of 5-year. The 5-year gross cumulative continuation rates per 100 women for MLCu250 and VCu200 were 80.0 and 81.7 respectively. The 5-year cumulative expulsion rate was significantly lower in MLCu250 group (1.0) than that in VCu200 group (8.1) (P < 0.05), while the pregnancy rate was higher in MLCu group (12.0 vs. 4.1) but no statistical…

An Electrochemical Study of the Corrosion Behaviour of the Polished Atomic Diffusion Additive Manufactured 17-4PH Stainless Steel Using Centrifugal Mass Finishing Method in Saltwater.

Additive manufacturing (AM) enables the fabrication of complex geometries and high-performance alloys such as 17-4PH stainless steel. However, the surface defects inherent to AM components compromise corrosion resistance. The post surface treatment can reduce and eliminate these defects. This study examines the effect of centrifugal mass finishing on the corrosion behaviour of 17-4PH stainless steel produced by AM. Corrosion behaviour of the samples in a 0.6 M NaCl solution is assessed using electrochemical technique testing, including asymmetry electrochemical nose, potentiodynamic polarisati…

Evaluation of stress generation in core build up-material of mutilated primary teeth: a comparative finite element analysis between BioFlx, stainless steel and zirconia crowns.

Stainless-steel crowns (SSCs) are the most durable restorative option for deciduous teeth, although they are unsightly. However, prefabricated zirconia crowns (ZCs) look more pleasant but require substantial dental preparation. Recently, BioFlx crowns have been introduced as a white-colored alternative to SSCs, providing both flexibility and aesthetics. However, clinical trials have not assessed their oral cavity load-bearing capacity and suitability for repairing severely decayed deciduous teeth. To address this gap, the present study compared the shear stresses generated by BioFlx crowns, ZC

Evaluation of AISI Type 304 stainless steel as a suitable surface material for evaluating the efficacy of peracetic acid-based disinfectants against Clostridium difficile spores.

Disinfectants play an important role in controlling microbial contamination on hard surfaces in hospitals. The effectiveness of disinfectants in real life can be predicted by laboratory tests that measure killing of microbes on carriers. The modified Quantitative Disk Carrier Test (QCT-2) is a standard laboratory method that employs American Iron and Steel Institute (AISI) Type 430 stainless steel carriers to measure hospital disinfectant efficacy against Clostridium difficile spores. The formation of a rust-colored precipitate was observed on Type 430 carriers when testing a peracetic acid (P…

A case report on a full-thickness chest wall reconstruction with polypropylene mesh and stainless steel mesh concurrently using a transverse rectus abdominis myocutaneous flap.

A full-thickness chest wall resection requires subsequent chest wall reconstruction. A chest wall resection and reconstruction was performed using a transverse rectus abdominis myocutaneous (TRAM) flap, together with polypropylene mesh (Marlex mesh) and stainless steel mesh (SSM). A 71-year-old man was diagnosed as having recurrent lung cancer in the chest wall, and underwent surgical resection. Marlex mesh was sutured to the posterior wall of the surgical defect. A portion of the SSM was adjusted to the size of the defect and cut out. Its edges were folded to make the portion into a plate. Th…

A Comparative In Vitro Study on Heat Generation with Static Guided and Conventional Implant Bed Preparation Using Stainless Steel Twist Drills and a Standardized Bovine Model.

The aim of this in vitro study was to evaluate the differences in heat generation across the drilling techniques, depths, and irrigation conditions of static computer-assisted implant surgery (S-CAIS) and conventional implant preparation (CIP) using a standardized bone model for comparative investigation. A total of 240 automated intermittent experimental procedures of 10 and 12 mm drilling depths were performed during S-CAIS and CIP using stainless steel twist drills of three drill diameters (2.2, 2.8, and 3.5 mm) and two irrigation modes (without/external cooling) at room temperature. Temper…

Prospective randomized comparison of early and late results of a carbonized stent versus a high-grade stainless steel stent of identical design: the PREVENT Trial [corrected].

BACKGROUND: Restenosis after coronary interventions with stent implantation is still the main obstacle of interventional cardiology. The aim of this study was to compare a carbonized and high-grade stainless steel stent of identical design with regard to early and late adverse events. METHODS: In this prospective randomized trial the carbonized MAC stent (amg GmbH, Raesfeld-Erle, Germany) was compared with the stainless steel MAC stent of identical design. Primary end point was diameter stenosis at follow-up; secondary end points were angiographic parameters, rate of restenosis, and major car…

Clinical and radiographic assessment of composite CAD/CAM endocrowns and stainless steel crowns for endodontically treated first permanent molars in Egyptian children: randomized controlled pilot study.

BACKGROUND: Dental caries in first permanent molars (FPMs) constitutes a worldwide health concern. Managing FPMs with deep dental caries in children poses a significant struggle for dental practitioners. The objective of this research is the clinical and radiographic evaluation of composite CAD/CAM endocrowns as restoration versus stainless steel crowns (SSCs) for endodontically treated FPMs in children. PATIENTS AND METHODS: This pilot study evaluated 24 children with deep caries in FPMs attending the dental clinic of Pediatric Dentistry and Dental Public Health Department, Faculty of Dentis…