scholarly journals Eradicating Fungal Periprosthetic TKA “Super-infection”: Review of the Contemporary Literature and Consideration of Antibiotic-Impregnated Dissolving Calcium Sulfate Beads as a Novel PJI Treatment Adjunct

2021 ◽  
Vol 8 ◽  
pp. 163-170
Author(s):  
Andrew P. Kurmis
Author(s):  
K. Cowden ◽  
B. Giammara ◽  
T. Devine ◽  
J. Hanker

Plaster of Paris (calcium sulfate hemihydrate, CaSO4. ½ H2O) has been used as a biomedical implant material since 1892. One of the primary limiting factors of these implants is their mechanical properties. These materials have low compressive and tensile strengths when compared to normal bone. These are important limiting factors where large biomechanical forces exist. Previous work has suggested that sterilization techniques could affect the implant’s strength. A study of plaster of Paris implant mechanical and physical properties to find optimum sterilization techniques therefore, could lead to a significant increase in their application and promise for future use as hard tissue prosthetic materials.USG Medical Grade Calcium Sulfate Hemihydrate Types A, A-1 and B, were sterilized by dry heat and by gamma radiation. Types A and B were additionally sterilized with and without the setting agent potassium sulfate (K2SO4). The plaster mixtures were then moistened with a minimum amount of water and formed into disks (.339 in. diameter x .053 in. deep) in polyethylene molds with a microspatula. After drying, the disks were fractured with a Stokes Hardness Tester. The compressive strengths of the disks were obtained directly from the hardness tester. Values for the maximum tensile strengths σo were then calculated: where (P = applied compression, D = disk diameter, and t = disk thickness). Plaster disks (types A and B) that contained no setting agent showed a significant loss in strength with either dry heat or gamma radiation sterilization. Those that contained potassium sulfate (K2SO4) did not show a significant loss in strength with either sterilization technique. In all comparisons (with and without K2SO4 and with either dry heat or gamma radiation sterilization) the type B plaster had higher compressive and tensile strengths than that of the type A plaster. The type A-1 plaster however, which is specially modified for accelerated setting, was comparable to that of type B with K2SO4 in both compressive and tensile strength (Table 1).


TAPPI Journal ◽  
2011 ◽  
Vol 10 (1) ◽  
pp. 17-23
Author(s):  
KEVIN TAYLOR ◽  
RICH ADDERLY ◽  
GAVIN BAXTER

Over time, performance of tubular backpulse pressure filters in kraft mills deteriorates, even with regular acid washing. Unscheduled filter replacement due to filter plugging results in significant costs and may result in mill downtime. We identified acid-insoluble filter-plugging materials by scanning electron microscope/energy-dispersion X-ray spectroscopy (SEM/EDS) and X-ray diffraction (XRD) analysis in both polypropylene and Gore-Tex™ membrane filter socks. The major filter-plugging components were calcium sulfate (gypsum), calcium phosphate (hydroxylapatite), aluminosilicate clays, metal sulfides, and carbon. We carried out detailed sample analysis of both the standard acid-washing procedure and a modified procedure. Filter plugging by gypsum and metal sulfides appeared to occur because of the acid-washing procedure. Gypsum formation on the filter resulted from significant hydrolysis of sulfamic acid solution at temperatures greater than 130°F. Modification of the acid-washing procedure greatly reduced the amount of gypsum and addition of a surfactant to the acid reduced wash time and mobilized some of the carbon from the filter. With surfactant, acid washing was 95% complete after 40 min.


2012 ◽  
Vol 53 (6) ◽  
pp. 1154-1158 ◽  
Author(s):  
Wei-Luen Chen ◽  
Nai-Yen Fan ◽  
Jing-Wei Lee ◽  
Ruey-Mo Lin ◽  
Chien-Ping Ju ◽  
...  

2014 ◽  
Vol 4 (1) ◽  
pp. 43-54
Author(s):  
Jowita Gromysz

Summary Disease in the family is a literary motif used by many authors. The article contains a description of various ways of representing the disease in contemporary texts for young children. Pedagogical context of reading literary narratives refers to the way the rider repons to the text ( relevance to the age of the reader, therapeutic and educational function). The analyzed texts concern hospitalization, disability of siblings, parent’s cancer. There always relate to the family environment and show the changeability of roles and functions in family.


2020 ◽  
pp. 446-460
Author(s):  
Nadezhda N. Starikova ◽  

In 1920, the native Slovenian lands of southern Carinthia were included into the Austrian Republic, and the Slovenian population fell under the jurisdiction of the state, the official language of which was German. Under these conditions, literature in the native language became an important factor in the resistance against assimilation for the Carinthian Slovenes. However, decades later, the national protective function of the artistic word gradually came to naught. The contemporary literature of the Slovenian minority in Austria is a special phenomenon combining national and polycultural components and having two cultural and historical contexts, two identities - Slovenian and Austro-German. In aesthetic, thematic, linguistic terms, this literature is so diverse that it no longer fits into a literature of a national minority, and can no longer be automatically assigned to only one of the two literatures - Slovenian or Austrian. A variety of works, including proper Slovenian texts, hybrid bilingual forms, and compositions in German, of course, requires a new research methodology that would expand existing approaches and could cover the literary practice of those who create a panorama of Carinthian reality, which is in demand both in Slovenia and in Austria.


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