Search results for "Nucleation"
showing 10 items of 364 documents
Effect of graphene substrate type on formation of Bi2Se3 nanoplates
2019
AbstractKnowledge of nucleation and further growth of Bi2Se3 nanoplates on different substrates is crucial for obtaining ultrathin nanostructures and films of this material by physical vapour deposition technique. In this work, Bi2Se3 nanoplates were deposited under the same experimental conditions on different types of graphene substrates (as-transferred and post-annealed chemical vapour deposition grown monolayer graphene, monolayer graphene grown on silicon carbide substrate). Dimensions of the nanoplates deposited on graphene substrates were compared with the dimensions of the nanoplates deposited on mechanically exfoliated mica and highly ordered pyrolytic graphite flakes used as refer…
Current molecular and clinical insights into uveal melanoma (Review)
2021
Uveal melanoma (UM) represents the most prominent primary eye cancer in adults. With an incidence of approximately 5 cases per million individuals annually in the United States, UM could be considered a relatively rare cancer. The 90.95% of UM cases arise from the choroid. Diagnosis is based mainly on a clinical examination and ancillary tests, with ocular ultrasonography being of greatest value. Differential diagnosis can prove challenging in the case of indeterminate choroidal lesions and, sometimes, monitoring for documented growth may be the proper approach. Fine needle aspiration biopsy tends to be performed with a prognostic purpose, often in combination with radiotherapy. Gene expres…
A Probabilistic Model for Crystal Growth Applied toProtein Deposition at the Microscale.
2018
A probabilistic discrete model for 2D protein crystal growth is presented. This model takes into account the available space and can describe growing processes of a different nature due to the versatility of its parameters, which gives the model great flexibility. The accuracy of the simulation is tested against a real recrystallization experiment, carried out with the bacterial protein SbpA from Lysinibacillus sphaericus CCM2177, showing high agreement between the proposed model and the actual images of the crystal growth. Finally, it is also discussed how the regularity of the interface (i.e., the curve that separates the crystal from the substrate) affects the evolution of the simulation.
Ion–Molecule Rate Constants for Reactions of Sulfuric Acid with Acetate and Nitrate Ions
2022
Atmospheric nucleation from precursor gases is a significant source of cloud condensation nuclei in the troposphere and thus can affect the Earth's radiative balance. Sulfuric acid, ammonia, and amines have been identified as key nucleation precursors in the atmosphere. Studies have also shown that atmospheric ions can react with sulfuric acid to form stable clusters in a process referred to as ion-induced nucleation (IIN). IIN follows similar reaction pathways as chemical ionization, which is used to detect and measure nucleation precursors via atmospheric pressure chemical ionization mass spectrometers. The rate at which ions form clusters depends on the ion-molecule rate constant. Howeve…
Hydration of calcium sulfate hemihydrate (CaSO4·H2O) into gypsum (CaSO4·2H2O). The influence of the sodium poly(acrylate)/surface interaction and mol…
2000
Abstract The retarding influence of sodium poly(acrylate) (PANa) on the hydration of calcium sulfate hemihydrate (CaSO 4 · 1 2 H 2 O) was investigated. This study reports the influence of sodium poly(acrylate) on hemihydrate dissolution, on homogenous and heterogeneous gypsum (CaSO 4 ·2H 2 O) nucleation as well as on gypsum growth. It is shown that adsorption of PANa does not hinder the dissolution of hemihydrate in the present experimental conditions. The specific interaction of PANa with gypsum can explain the oriented growth of gypsum crystal. The gypsum growth is slowed down but cannot be blocked by the adsorption of PANa. On the other hand, PANa can block the heterogeneous and homogeno…
Marsupialization facilitates movement of the cystic lesion-associated deeply impacted mandibular third molar in spite of its mature roots
2017
Background: The odontogenic cystic lesions happened in the angle and ramus region are frequently associated with impacted mandibular third molars. The treatment plan was difficult to work out for the huge cystic lesions with deeply impacted third molars, since the enucleation with simultaneously removing the deeply impacted teeth may cause serious complications. Therefore, the marsupialization of the cystic lesions followed by enucleation with tooth removal has also been advocated. The aim of this study was to explore the movement of cystic lesion-associated deeply impacted mandibular third molars (IMTM) after marsupialization. Material and Methods: Between July 2009 and December 2015, pati…
Management of primary odontogenic myxoma
2018
BACKGROUND: This retrospective study describes our experience in the management of odontogenic myxoma. METHODS: Thirty-four patients (23 female and 11 male) with single lesions were treated. Thirty-three patients were adults (mean age 33.5 years) and one child (age 6 years). Male:female ratio was 1:2. Different surgical procedures were used to treat the tumors. 11 lesions were treated by marginal osteotomy, 12 lesions by enucleation and curettage, 11 lesions by radical treatment (segmental or block resection). The follow-up period was 5-years. RESULTS: The success rate was 73.5%. The Kaplan-Meier method was applied to examine the outcome of the treatment. Analysis showed a significant diffe…
Recurrence of odontogenic keratocysts and possible prognostic factors : review of 455 patients
2019
Background To describe epidemiological features of 565 Chinese patients with odontogenic keratocysts (OKC), to investigate possible prognostic factors related to recurrence, and to analyse features of recurrent OKC (rOKC). Material and Methods A retrospective chart review of 565 cases of OKC treated between 2003 and 2015 was undertaken. The probability of recurrence related to prognostic factors including large size, cortical perforation combined with involved teeth in the lumen of the cyst, inflammation, sites of the involved lesion, sex, and daughter cyst variables were analysed. The subsequent relapse of each OKC was compared. Results Patients ranged in age from 7 to 81 years (mean age, …
Incidence of Cardiovascular Events after Nephrectomy - A Single Centre, Matched Pair Analysis between Donor and Tumour Nephrectomy in a Long Term Fol…
2016
<b><i>Introduction:</i></b> The study aimed to compare the incidence of cardiovascular events (CVEs) after donor nephrectomy (DN) and radical tumor nephrectomy (RN), according to an estimated glomerular filtration rate (eGFR), were evaluated over time. <b><i>Materials and Methods:</i></b> Follow-up was collected for DN who underwent surgery from 1998 to 2007 for CVE and renal function. All DN were matched for age to patients treated by RN or adenoma enucleation (control group), who were eligible for DN. eGFR was estimated using the Cockgroft-Gould formula. Patients with preoperative comorbidities were excluded. <b><i>Results:</i…
Histopathology of ameloblastoma of the jaws; some critical observations based on a 40 years single institution experience
2011
The aim of the present study is to examine all cases of intraosseous benign ameloblastomas treated between 1970 and 2010 in a single institution and to look for a possible correlation between the histopathological aspects and the demographical and clinical parameters, as well as the treatment outcome. The data of a total number of 44 patients were retrieved from the records. Nine patients were excluded because of doubt about the correct diagnosis (8 patients) or because of an extra-osseous presentation (1 patient). No statistically significant differences were found between the histopathological (sub)types of ameloblastomas and the demographical and clinical parameters, nor between the hist…