Background. The term “paraduodenal pancreatitis” (PP) was proposed as a synonym for duodenal dystrophy (DD) and groove pancreatitis, but it is still unclear what organ PP originates from and how to treat it properly. Objective. To assess the results of different types of treatment for PP. Method. Prospective analysis of 62 cases of PP (2004–2013) with histopathology of 40 specimens was performed; clinical presentation was assessed and the results of treatment were recorded. Results. Preoperative diagnosis was correct in all the cases except one (1.9%). Patients presented with abdominal pain (100%), weight loss (76%), vomiting (30%), and jaundice (18%). CT, MRI, and endoUS were the most useful diagnostic modalities. Ten patients were treated conservatively, 24 underwent pancreaticoduodenectomies (PD), pancreatico- and cystoenterostomies (8), Nakao procedures (5), duodenum-preserving pancreatic head resections (5), and 10 pancreas-preserving duodenal resections (PPDR) without mortality. Full pain control was achieved after PPRDs in 83%, after PDs in 85%, and after PPPH resections and draining procedures in 18% of cases. Diabetes mellitus developed thrice after PD. Conclusions. PD is the main surgical option for PP treatment at present; early diagnosis makes PPDR the treatment of choice for PP; efficacy of PPDR for DD treatment provides proof that so-called PP is an entity of duodenal, but not “paraduodenal,” origin.
The search for novel efficient antibacterial agents is attracting a great attention due to the unregulated use of common antibiotics and development of multidrugresistant bacteria strains. This paper proposes an eco-friendly approach to obtain stable chitosan-capped silver nanoparticles with controlled physicochemical and biological properties using reducing and stabilizing capacity of chitosan. The study of the influence of chitosan characteristics on the kinetic of Ag + reduction showed that an increase in polysaccharide molecular weight led to a decrease in their reducing ability. The synthesized silver nanoparticles were characterized by UV and FTIR spectroscopy, TEM, XRD, DLS. The relationships between physicochemical characteristics of the formed silver nanoparticles and the type of used chitosan, as well as synthesis temperature, were determined. It has been demonstrated that spherically-shaped (13-27 nm) and positively-charged (zeta-potential 26.1-29.5 mV) silver nanoparticles with a single symmetric SPR band at 408-418 nm are stable during 6 months in a colloidal form, and can be produced with the assistance of low-molecular weight chitosan (20-30 kDa) at 95 C. The synthesized silver nanoparticles enhanced the antibacterial activity of kanamycin and ampicillin against both gram-negative and gram-positive bacteria. These results revealed the prospects for the application of chitosan-capped silver nanoparticles to create new effective antibacterial systems (gels, films, etc).
Titania films, doped with erbium, were fabricated on porous anodic alumina from a normalTifalse(OC2H5)4 precursor. The samples, subjected to thermal processing up to 1270 K, exhibited strong luminescence at 1.53 μm associated with 4I13/2→4I15/2 transitions of Er3+ ions in the TiO2 xerogel. The intensity of photoluminescence increased with the number of xerogel film depositions onto alumina. Secondary ion mass spectrometry analyses show that the pores of anodic alumina are filled by the xerogel after sequential spinning of ten layers. Cooling of the samples to 4.2 K gives enhancement of the intensity of the Er-related band at 1.53 μm and narrowing of the full width at half maximum from 20 to 10 nm. © 2001 The Electrochemical Society. All rights reserved.
Strong enhancement of green photoluminescence ͑PL͒ from microporous alumina xerogels, highly doped with terbium ͑from 30 to 60 wt % as Tb 2 O 3 ͒, is reported. The regular structure of a 30 m thick, mesoporous anodic alumina layer was exploited for spin-on deposition of the alumina xerogel in a single step. The green PL, associated with predominant 5 D 4 → 7 F 5 transitions, along with 5 D 4 → 7 F j , j ϭ 3, 4, 5, 6 transitions of Tb 3ϩ , was found to increase with terbium concentration in the alumina xerogel. This effect is attributed to cross-relaxation. The thermal quenching of the green terbium-related emission does not exceed a factor of two within a temperature range from 10 to 300 K for any of the alumina xerogels confined in anodic alumina. Further, such quenching is much reduced with the rise of temperature compared with (i) Tb-doped titania xerogel, ͑ii͒ Tb-implanted thermally grown silicon dioxide film, and ͑iii͒ Tb-doped alumina xerogels fabricated onto monocrystalline silicon. Thus, the terbium-doped structure comprising alumina xerogel/anodic alumina is proposed as a basis for green room-temperature luminescent images. ver the last decade, the low-cost sol-gel method for fabricating luminescent structures containing incorporated optically active lanthanides has been investigated intensively. The sol-gel method allows diverse xerogel films, highly doped with lanthanides, to be produced. Spin-on deposition was usually employed in fabrication of films doped with optically active erbium, 1,2 neodymium, 3 terbium, 4 and other lanthanides. Unlike the dry processes, 5 the sol penetrates the mesopores of porous silicon, promoting synthesis of a xerogel film in the pore volume of a layer of several micrometers thickness. Strong 1.53 m photoemission from porous silicon, coated with a spin-on, erbium-doped silica gel film, has been shown. 1,6 Exploitation of the mesoporous layer avoids procedures involving numerous sequential spin-on depositions, which are needed to obtain strong room-temperature photoluminescence ͑PL͒ from lanthanide ions in a xerogel film of several micrometers thickness.Recently, we reported enhancement of terbium PL from a terbium-doped titania xerogel, mesoscopically confined in porous anodic alumina. 4 Porous anodic alumina exhibits a regular porous morphology, with pores at the centers of approximately hexagonally packed cells. 7 The regular morphology of porous anodic alumina, with pores passing normally to the macroscopic substrate surface, possesses some advantages over the irregular geometry of mesoporous silicon 8 for synthesis of sol-gel derived products. In addition, their regular mesoscale morphology can be extended to thicknesses of 100 m. Porous alumina has been demonstrated to be an excellent support for xerogel solids doped with the optically active lanthanides. 4,9,10 The combination of mesoporous layers and xerogels doped with optically active lanthanides enhances the lanthanide photoluminescence. This has already been confirmed for lanthanides incorporated within xerogel ...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.