• 제목/요약/키워드: Columbia

검색결과 665건 처리시간 0.024초

Chemical Constituents of the Moss Hylocomium splendens

  • Kang, Shin-Jung;Jovel, Eduardo;Hong, Seong-Su;Hwang, Bang-Yeon;Liu, Patty;Lee, Meng-Hsin;Lee, Meng-Chun;Lee, Kyung-Soon;Towers, George Hugh Neil
    • Natural Product Sciences
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    • 제13권4호
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    • pp.394-397
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    • 2007
  • Investigation of the chemical constituents of the dichloromethane extract from the moss Hylocomium splendens has led to the isolation of $5{\alpha},8{\alpha}$-epidioxy-24(S)-ethylcholesta-6,22-dien-$3{\beta}$-ol (1), diploptene (2), ${\beta}-sitosterol$ (3), and 1-hexacosanol (4). The chemical structures of 1 - 4 were established by spectroscopic methods including extensive 1D and 2D NMR analysis. This is the first isolation of compound 1 from the mosses, although it has been isolated from marine sponge.

A retrospective study of incidental findings occurring in a consecutive case series of lateral cephalograms of 12- to 20-year-old patients referred for routine orthodontic treatment

  • MacDonald, David;Patel, Akash;Zou, Bingshuang;Yen, Edwin;Vora, Siddharth R.
    • Imaging Science in Dentistry
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    • 제52권3호
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    • pp.295-302
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    • 2022
  • Purpose: Lateral cephalograms of orthodontic patients may contain incidental findings that could potentially lead to harm. Materials and Methods: The lateral cephalograms of 1765 consecutive 12- to 20-year-old patients, being considered for routine orthodontic treatment, were retrospectively reviewed. These patients were considered normal, because no abnormalities were found either in their medical history or on their clinical examination. Results: The overall prevalence of incidental findings was 18.8%, of which 10.3% were ponticulus posticus and 4.2% were bridging of the sella turcica. Although occipital spurs and ponticulus posticus were more prevalent in males, the size of the sella turcicas did not differ between sexes. Of the 1156 patients completing treatment about 2 years later, only one lateral cephalogram displayed progression of the ponticulus posticus in that time. Conclusion: The prevalence of incidental findings on lateral cephalograms of otherwise normal orthodontic 12- to 20-year-old patients was almost a fifth, of which ponticulus posticus, vertebral fusion, and enlarged parietal foramina were clinically significant.

A Lifestyle Communication Tool: Association of E-cigarette Use and Pre-diabetes

  • Nilanga Aki Bandara;Tanisha Vallani;Xuan Randy Zhou;Senara Hansini Palihawadane;Rochelle Gamage;Miles Mannas;Jay Herath
    • Journal of Preventive Medicine and Public Health
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    • 제56권4호
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    • pp.384-387
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    • 2023
  • The aim of this study was to present a framework for clinicians to use when discussing electronic cigarette (e-cigarette) use and its association with pre-diabetes. A communication tool was designed using evidence-based strategies from the academic literature. A four-step framework is presented, which includes: step (1) helping patients to understand the association between e-cigarette use and pre-diabetes; step (2) the synergistic health impacts of e-cigarette use and pre-diabetes; step (3) management of diabetes-related lifestyle factors; and step (4) stages of change assessment related to e-cigarette reduction. This communication tool provides support for clinicians to discuss the risk of pre-diabetes associated with e-cigarette use. Moving forward, implementation and evaluation of this model are needed.

A Knife Penetrating the Right Ventricle, Interventricular Septum, and 2 Valves: A Case Report

  • Megan Minji Chung;Stephanie Nguyen;Isao Anzai;Hiroo Takayama
    • Journal of Chest Surgery
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    • 제56권6호
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    • pp.456-459
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    • 2023
  • Penetrating chest trauma may result in significant intracardiac injury. A traumatic ventricular septal defect is a rare complication that requires surgical management, particularly if heart failure ensues. We report a case of delayed repair of an outlet-type ventricular septal defect and perforation of the aortic and pulmonary valve leaflets following a stab wound. This report highlights diagnostic and surgical considerations and also presents an opportunity to review the conotruncal anatomy, which may be relatively unfamiliar to many adult cardiac surgeons.

COR-KNOT-Induced Leaflet Perforation: How It Happens and How to Prevent It: A Case Report

  • Michael Salna;Jack Shanewise;Alex D'Angelo;Isaac George
    • Journal of Chest Surgery
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    • 제57권1호
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    • pp.96-98
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    • 2024
  • The COR-KNOT suture fastening device has dramatically improved the efficiency of valve suture fixation. Despite its relative ease of use, there are important considerations in deployment to limit the risk of prosthetic valve injury. Herein, we report a case of iatrogenic aortic bioprosthetic insufficiency caused by poorly positioned COR-KNOTs and outline technical strategies to ensure success.