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Richard Hall,Cassandra Bruce-Brand,Washington Mudini,Alessandro Pietro Aldera 대한상부위장관ㆍ헬리코박터학회 2024 Korean Journal of Helicobacter Upper Gastrointesti Vol.24 No.1
Objectives: The identification of Helicobacter pylori is one of the main tasks of diagnostic histopathologists when evaluating endoscopic gastric biopsies. The sensitivity and specificity of different stains that facilitate this identification vary. Despite the existing guidelines, many histopathology laboratories perform routine histochemical staining of all gastric biopsies to improve turnaround times. This study assessed the utility of an H. pylori immunohistochemical (IHC) stain compared with a routinely used histochemical stain, cresyl violet (CV), in the South African setting. Methods: Cases were identified retrospectively, and original histopathology reports were used to establish the “ground truth” diagnoses. Three pathologists independently evaluated the CV and IHC stains; each pathologist was timed in a standardized manner. The sensitivity, specificity, interobserver variability, and time taken to identify H. pylori with each stain were compared. Results: The overall sensitivity and specificity for IHC staining (85.2% and 97.7%, respectively) were higher than those for CV staining (64.5% and 90.6%, respectively). Detection of H. pylori took an average of 16 and 49 seconds using the IHC and CV stains, respectively. The prevalence of H. pylori in our laboratory was 23.7%, which is lower than the reported national prevalence in South Africa. Conclusions: IHC stain-based detection of H. pylori in inflamed gastric biopsies demonstrated superior sensitivity and specificity than CV staining. This was particularly true for cases involving patients with low bacterial loads. The interpretation of H. pylori IHC staining is much faster than that associated with CV staining, which is important in centers with high caseloads and shortages of pathologists.
Robert H. Koch’s Work on Lightweight Medium-Aperture Mirrors
Bruce D. Holenstein,Richard J. Mitchell 한국우주과학회 2012 Journal of Astronomy and Space Sciences Vol.29 No.1
After a visit by Peter Waddell from the University of Strathclyde, Glasgow, UK in 1991, Robert H. Koch launched a program at the University of Pennsylvania to build lightweight pneumatic membrane mirrors, initially for balloon flight observations where weight is at a premium. Mirror cells were fabricated from sizes 0.18 m to 1.77 m, and experiments conducted to characterize the mirror figure and stability. Most of the work stopped after Prof. Koch’s retirement in 1996 until 2006 when the authors expressed an interest in building an array of medium-aperture portable telescopes. The program restarted in earnest at Gravic, Inc. in Malvern, PA in 2008 with Koch using his extensive observational astronomy experience to guide the fabrication of a fully operational 1.07 m membrane mirror telescope with an optical tube assembly weighing under 45 Kg. Residual wavefront aberrations remediation resulted in Koch and the authors investigating membrane tensioning techniques with different cell designs, active secondary wavefront correction, photometric algorithms for aberrated images, and the use of additional lightweight mirror substrates from the Alt-Az Initiative Group, such as foamed glass. The best result for the lightweight mirrors was a point spread function spot size of several arc seconds. A lightweight 1.6 m cast aluminum cell alt-az telescope was subsequently designed by Koch and the authors for prime focus use.
Robert H. Koch's Work on Lightweight Medium-Aperture Mirrors
Holenstein, Bruce D.,Mitchell, Richard J. 한국우주과학회 2012 Journal of Astronomy and Space Sciences Vol.29 No.1
After a visit by Peter Waddell from the University of Strathclyde, Glasgow, UK in 1991, Robert H. Koch launched a program at the University of Pennsylvania to build lightweight pneumatic membrane mirrors, initially for balloon flight observa\-tions where weight is at a premium. Mirror cells were fabricated from sizes 0.18 m to 1.77 m, and experiments conducted to characterize the mirror figure and stability. Most of the work stopped after Prof. Koch’s retirement in 1996 until 2006 when the authors expressed an interest in building an array of medium-aperture portable telescopes. The program re\-started in earnest at Gravic, Inc. in Malvern, PA in 2008 with Koch using his extensive observational astronomy experience to guide the fabrication of a fully operational 1.07 m membrane mirror telescope with an optical tube assembly weigh\-ing under 45 Kg. Residual wavefront aberrations remediation resulted in Koch and the authors investigating membrane tensioning techniques with different cell designs, active secondary wavefront correction, photometric algorithms for ab\-errated images, and the use of additional lightweight mirror substrates from the Alt-Az Initiative Group, such as foamed glass. The best result for the lightweight mirrors was a point spread function spot size of several arc seconds. A lightweight 1.6 m cast aluminum cell alt-az telescope was subsequently designed by Koch and the authors for prime focus use.
교정적 치아이동시 부갑상선홀몬이 긴장측 치주세포의 cAMP농도에 미치는 영향
Davidovitch, Z.,Lanese,R.R.,Schanfeld, J.L.,Zwilling, B.S.,이기수 대한치과교정학회 1986 대한치과교정학회지 Vol.16 No.1
Parathyroid hormone (PTH) is known to exert its effects on bone cells through the mediation of adenosine 3', 5'-monophosphate (cAMP). Orthodontic force have also been shown to alter the cAMP content of paradental cells, particularly the alveolar bone osteoblasts. The objective of this experiment was to determine whether a combined orthodontic treatment-PTH administration regimen would have an additive effect on cAMP content in paradental cells in sites of periodontal logament (PDL) tension. Seven groups of 4 one year old female cats each were treated for 1,3,6,12,24 h, 7 and 14 d by tipping one maxillary canine. PTH was administered twice daily, 30u/kg. Maxillary horizontal sections were stained immunohistochemically for cAMP and the degree of cellular staining intensity was determined microphotometrically as per cent light transmittance at 600nm. Alveolar bone osteoblasts, progenitor cells, PDL fibroblasts and cementoblasts in tenion sites were measured and the data were analyzed statistically by a mixed model analysis of variance. PTH administration increased the cAMP staining of nonorthodontically treated paradental ceels in comparison to ceels untreated by force or hormone. Cells in PDL tension sites of PTH-treated cats demonstrated significantly darker cAMP staining than cells in non-orthodonticaaly-treated sites. Osteoblasts demonstrated the greatest respons in terms of cAMP elevation, while in PDL fibroblasts orthodontic force did not increase cAMP levels above those measured in non-stretched hormonally-treated cells. These results demonstrate that PTH increases cAMP levels in paradental cells, particullarly in osteoblasts, and that tje effects of PTH and orthodontic forces on paradental target cells may approach additivity.