Costellorees3640

Gas hydrate formation has several applications in CO2 sequestration, flow assurance, and desalination. Nucleation of hydrates is constrained by very high induction (wait) times, which necessitates the use of complex nucleation promotion techniques to form hydrates. Presently, we report the discovery of a simple, passive nucleation promotion technique, wherein an aluminum surface significantly accelerates nucleation of CO2hydrates. Statistically meaningful measurements of induction times for CO2 hydrate nucleation were undertaken using water droplets as individual microsystems for hydrate formation. The influence of various metal surfaces, droplet size, CO2 dissolution time, and the presence of salts in water on nucleation kinetics was characterized. Interestingly, we observe nucleation initiation only on aluminum surfaces, the influence of which cannot be replicated by salts of aluminum. We discover that the aluminum-water interface is responsible for nucleation promotion. We hypothesize that hydrogen bubbles generated at the aluminum-water interface are responsible for nucleation promotion.Three kinds of perovskite nanoparticles encapsulated with different chain lengths of alkylammonium, (CH3NH3)x(CH3(CH2)3NH3)(1-x)PbBr3 (NP-C4), (CH3NH3)x(CH3(CH2)7NH3)(1-x)PbBr3 (NP-C8), and (CH3NH3)x(CH3(CH2)11NH3)(1-x)PbBr3 (NP-C12), are successfully prepared. X-ray powder diffraction experiments demonstrate that these three nanoparticles are all pure cubic phase. However, the compositions of these three nanoparticles are significantly different, as revealed by steady-state absorption spectra. NP-C4 mainly consists of 2D perovskite with m (number of unit cell layers) = 1 and 3D perovskite. Instead, NP-C8 and NP-C12 are mainly composed of 2D perovskite with m = 3, 4, and 5. Time-resolved fluorescence spectra and femtosecond transient absorption spectra suggest the presence of energy transfer from 2D perovskite to 3D perovskite in these three nanoparticles. More importantly, the energy-transfer rate gradually decreases from NP-C4 to NP-C12. This result suggests that the composition of perovskite nanoparticles and their corresponding photophysical properties can be controlled by the chain length of alkylammonium. This provides a new insight for preparing novel perovskite nanoparticles for special applications.Surface-enhanced Raman spectroscopy (SERS) has been recognized as a promising analytical technique owing to its merit of nondestructive and fast detection capabilities. However, SERS usually suffers signal interferences from different analytes or a complicated matrix. Separation is an effective approach to solve the signal interference in the application of SERS. ATR inhibitor 2 nmr It was proposed that two concentric coffee rings could serve as a simple separation platform; however, there are still many questions to be answered for in-depth understanding. In this study, critical parameters during the formation of two concentric coffee rings are characterized for a better understanding of this phenomenon, including surface tension, surface morphology, and surface energy. Two arsenicals, including arsenate (AsV) and cacodylic acid (DMAV), are chosen to study the arsenicals' separation/migration mechanism due to their significant difference in chemical properties. In the typical coffee ring, these two arsenicals have signal interference and only DMAV is detected via SERS; however, they are detected along the radius of the two concentric coffee rings. The distribution of arsenicals on the two concentric coffee rings is further verified by the chromatographic method. Under this simple platform, interactions between the arsenicals and the surface of the silver nanofilm are pivotal to their migration/separation. By surface modification of silver nanofilm with small molecules, the surface polarity and surface ζ potential are manipulated. The signal dynamics of these two arsenicals are studied on these modified silver nanofilms. It is clear that the electrostatic interaction plays a more important role than the polarity in the arsenicals' migration. This study reveals the mechanism of small molecule migration/separation in the two concentric coffee rings and provides insights for future study of employing this simple platform.INTRODUCTION  There is no data regarding the incidence and treatment of deep infection affecting the surgical implants after rib fixation. The aim of this study is to share our experience in the management of infected material after surgical rib fixation. METHODS  The medical records of operated patients from January 2012 to December 2018 were retrospectively analyzed. RESULTS  Three patients out of 87 (3.44%) developed an infection. One patient was treated conservatively and two patients were operated for hardware removal. CONCLUSIONS  The lack of evidence prompts for the design of surgical databases to share experience and enhance available data. Georg Thieme Verlag KG Stuttgart · New York.OBJECTIVE  This study aimed to report our experience in superior vena cava (SVC) resection and reconstruction for 22 thymic tumor patients and to make comparisons with previous related reports. METHODS  A retrospective study on 22 patients (15 thymomas, 7 thymic cancers) who underwent tumor resection with concomitant SVC reconstruction. All the patients underwent vascular conduit reconstruction by the cross-clamping technique. The corresponding data were reviewed, including clinical presentation, operation management (surgery procedure, selection of suitable graft, strategies against SVC syndrome, etc.), postoperative cares (antithrombotic agent application, treatments on brain edema, etc.), and follow-up information. RESULT  Two patients were myasthenic, well controlled by oral pyridostigmine. All resections were radical (R0). Ten patients received induction treatment. All the 15 thymoma patients were Masaoka stage III (type B1-B3). As for thymic cancer, six patients were Masaoka stage III and one was stage ieme Verlag KG Stuttgart · New York.in English, German ZIEL  Überprüfung des Wertes der Diffusionsbildgebung (DWI) bei der korrekten Identifizierung von zöliakalen (CG) und zervikothorakalen (CTG) sympathischen Ganglien in der multimodalen Ganzkörper-PSMA-Liganden-PET/MRT, angesichts ihres häufig irreführenden Uptakes im PET, was möglicherweise für bösartige Läsionen wie Lymphknotenmetastasen sprechen kann. METHODEN  Die Dicke und der Grad der Diffusionsrestriktion wurde qualitativ und quantitativ in 406 sympathischen Ganglien (189 CTG bei 101 Männern und 217 CG bei 116 Männern) auf DWI-Maps (b-Wert 0 und 800s/mm2) und ADC (“apparent diffusion coefficient”)-Maps (mittlerer ADC) des Ganzkörper-PET/MR 68Ga-PSMA-11 PET/MR bewertet. Um eine Referenzgruppe mit übereinstimmender Gangliengröße zu bilden, wurde von jedem Patienten mit Metastasen der kleinste Lymphknoten ausgewählt und dem gleichen Verfahren unterzogen. ERGEBNISSE  Bei der Mehrheit der sympathischen Ganglien (81,0 % der CTG, 67,3 % der CG und 73,6 % von allen) wurde eine sehr geringe bzw. niedrige Diffusionsrestriktion festgestellt. Bei den meisten Lymphknotenmetastasen (91,7 %) war der Grad der Diffusionsrestriktion moderat bis hoch. Die mittleren ADC-Werte in den sympathischen Ganglien waren in CTG, in CG und in allen Ganglien statistisch signifikant höher als in den Lymphknotenmetastasen (p  less then  0.001; bei großer Effektstärke). SCHLUSSFOLGERUNGEN  Sympathische zöliakale und zervikothorakale Ganglien zeigen in der visuellen DWI-Bewertung eine sehr niedrige bzw. niedrige Diffusionsrestriktion und in den meisten Fällen signifikant höhere mittlere ADC-Werte als Lymphknotenmetastasen und kann somit als zusätzliche Faktor bei der Differentialdiagnose in der multimodalen PSMA-Liganden-PET/MR-Bildgebung dienen. Daher scheint für eine korrekte Identifizierung von sympathischen Ganglien die PSMA-Liganden PET/MRT der PSMA-Liganden PET/CT potentiell überlegen zu sein.Lupinifolin, a plant flavonoid, has been reported to possess various pharmacological effects. It most likely exerts low oral bioavailability because of poor water solubility. link2 The objective of this study was to develop lipid nanocarriers as drug delivery systems to increase the gastrointestinal absorption of lupinifolin extracted from Albizia myriophylla. Three types of nanocarriers, lupinifolin-loaded solid lipid nanoparticles, lupinifolin-loaded nanostructured lipid carriers, and lupinifolin-loaded nanoemulsions, were prepared by an emulsification-sonication technique. All three types of nanocarriers loaded with lupinifolin, lupinifolin-loaded solid lipid nanoparticles, lupinifolin-loaded nanostructured lipid carriers, and lupinifolin-loaded nanoemulsions, were successfully synthesized. The lipid components chosen to formulate nanocarriers were tripalmitin and/or medium chain triglyceride. Physicochemical characterizations along with releasing profiles of lupinifolin-loaded lipid nanocarriers were compared. y. Georg Thieme Verlag KG Stuttgart · New York.Endophytic fungi can produce beneficial active components during symbiosis with host plants. Fifteen purified endophytic fungal strains were isolated and screened from root, stem, leaf, and fruit of the Chinese medicine food homologous plant Siraitia grosvenorii. These strains were fermented, and then the fermented solution was extracted using acetonitrile. The extracts were analyzed by high performance liquid chromatography (HPLC) and mass spectrum (MS), using standard mogroside V as control. The results showed that strain LHG-F5 and strain LHG-L4 could produce mogroside V with output of 3.814 µg/mL and 2.675 µg/mL, respectively. By morphological observation together with similarity of internal transcribed spacer (ITS) sequence by Clustan X method, LHG-F5 and LHG-L4 were classified as Diaporthe angelica and Fusarium solani, respectively. link3 Georg Thieme Verlag KG Stuttgart · New York.OBJECTIVES  To evaluate the shaping ability of four different single-file systems using micro-computed tomography (micro-CT). MATERIALS AND METHODS  Eighty mesiobuccal and mesiolingual canals of permanent mandibular molars were randomly assigned to four groups according to the file used; WaveOne Gold, RECIPROC Blue, HyFlex EDM, and One Shape (n = 20). The samples were scanned using micro-CT for the preinstrumentation record; then the canals were instrumented and scanned for the postinstrumentation records. STATISTICAL ANALYSIS  The data were then analyzed statistically using one-way analysis of variance (ANOVA) with the level of significance set at α = 0.05. RESULTS  The results of canal centering ratio and canal transportation showed that no significant difference was found among the four file groups at the middle and the coronal levels. However, a significant difference was found at the apical level (p less then  0.05), where WaveOne Gold showed the best centering ratio and the least amount of canal transportation. The change in the canal volume was significant at the coronal level (p less then  0.05), whereas the change in the canal volume was higher for the HyFlex EDM group than the other groups. No significant difference was found between the other groups at the apical level, middle level, or in the total percentage of canal volume. CONCLUSION  WaveOne Gold produced a more centralized canal preparation with a lesser amount of transportation at the apical level. HyFlex EDM showed the highest canal volumetric change at the coronal level. The interim design of the endodontic files has a high impact on the behavior of the file inside the root canal. Dental Investigation Society.