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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.
Populus alba × P . grandidentata 조직배양묘의 (組織培養苗) 토양에서의 활착과 생장
전영우,Richard B . Hall ( Young Woo Chun,Richard B . Hall ) 한국산림과학회 1984 한국산림과학회지 Vol.66 No.1
This study was undertaken to find out the effects of three kinds of potting media and two sources of explants on the survival and early growth of new plantlets of Poputus alba × P. grandidentata in the greenhouse. The results obtained can be summarized as follows; 1) Among three potting media, Terralite was best for early growth and survival of plantlets. 2) Like humidifier, an intermittent misting system can be effective in keeping relative humidity high for the plantlets. 3) Survival rates over 80% could be obtained if humidity was kept high during the hardening period. 4) During hardening period, the plantlets showed the juvenile characteristics such as smaller leaves, thinner stems, and shorter internodes. 5) There were no differences on morphological characteristics between the plantlets originating from axillary buds and the plantlets originating from multiple shoots while they were growing at the greenhouse. 6) The plantlets originating from bud culture grew normally comparing to regular cuttings.
Fulvic acid-mediated phototransformation of mecoprop. A pH-dependent reaction
Halladja, Sabrina,Halle, Alexandra Ter,Pilichowski, Jean-Francois,Boulkamh, Abdelaziz,Richard, Claire Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.7
Elliott soil fulvic acid sensitized the phototransformation of mecoprop in aqueous medium. The reaction was selective, leading to the main formation of 4-chloro-2-methylphenol in aerated and in deoxygenated neutral solution. In turn, 4-chloro-2-methylphenol underwent a fulvic acid-mediated phototransformation. A pH decrease from 8 to 2.2 led to an increase of the rate of mecoprop loss by a factor of 10. The roles of hydroxyl radicals, fulvic triplets and singlet oxygen were investigated using the scavenging technique. At pH 6.5 where mecoprop was in the anionic form, triplet excited states and hydroxyl radicals were the main oxidant species contributing to $40{\pm}10%$ and $20{\pm}5%$ of the reaction, respectively. At pH 2.2 where mecoprop was protonated, fulvic triplets and hydroxyl radicals contributed to $75{\pm}10%$ and $16{\pm}5%$, respectively. The enhancement of the reaction upon acidification might result from two phenomena tending to the same effect: (i) the capacity of protonated MCP to reach intra-humic microdomains and there interact with reactive species, and (ii) a greater photosensitizing property of FA in acidic medium.
姜鎬德,朴敎秀,Richard B. Hall 동국대학교 생명자원과학대학 연습림 1995 연습림논문집 Vol.- No.4
교잡종 포플러 (Canada blanc, Eugenei, Ⅰ-45/51, Wisconsin #5)의 기내증식에 미치는 요인들이 조사되어졌다. 식물성장 조절물질로서 싸이토키닌류와 오옥신류와의 조합은 뿌리, 줄기, 잎의 시료로부터 기내증식의 효율 증대에 영향을 미치었다. 일반적으로 benzylaminopurine (BA)과 오옥신과의 조합은 Canada blanc 클론의 잎 시료에 매우 효과적 이었고, zeation과 오옥신류와의 조합은 Wisconsin #5 클론의 줄기 시료에 매우 중요하게 작용했다. 각 시료에서 최대의 증식되어진 줄기의 수는 BA 2.0 ㎎/l를 처리 했을때 Canada blanc의 뿌리 시료로 부터 17.60±8.96개가 생산되어졌다. 반면에, Wisconsin #5의 줄기와 Canada blanc의 잎은 zeation/ 2.0㎎/l와 IAA 0.2㎎/l의 조합과/ BA0.5㎎/l와 2.4-D 0.05㎎/l의 조합에서 각각 18.20±3.03개와 17.80±1.92개의 줄기들을 증식시켰다. 특히, 싸이토키닌의 들어있는 배지에 2.4-D의 첨가는 줄기증식을 촉진시켰다.