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  • an Fore Sci:采伐迹地更新策略对地表苔藓多样性的影响

    苔藓植物是森林生态系统中生物多样性的重要组成部分,对森林的演替过程与功能起着重要的作用。由于苔藓植物具有单层细胞的特征,对微气候和微生境的依赖很强,因此苔藓植物对更新策略引起的微环境和微生境变化很敏感,常常被用作评估更新策略导致环境变化的指示植物。 自然更新形成阔叶林和人工营造针叶林是世界各地对采伐地更新采用的最常见的两种方式。自然更新和造林导致了不同的树种组成,可能会影响林下植物的多样性。

  • A 69 year old man 2 weeks after an inferior myocardial infarction

    Ventricular tachycardia A wide QRS tachycardia is VT until proven otherwise (1). Features suggesting VT include: evidence of AV dissociation independent P waves capture or fusion

  • an 57 year old lady with palpitations

    Atrial flutter with 2:1 AV conduction The sawtooth waveform of atrial flutter can usually be seen in the inferior leads II, III and aVF if one looks closely. Sometimes the rapid atrial rate can

  • an 82 year old lady with dizzy spells

    Atrial fibrillation and complete heart block Fibrillary waves of atrial fibrillation and no P waves. Regular ventricular rhythm The wider the QRS of the ventricular escape rhythm the le

  • an 84 year old lady with hypertension

    There are a number of abnormalities here. left anterior hemiblock QRS axis more left than -30 degrees initial R wave in the inferior leads (II, III and aVF) absence of any other

  • an 83 year old man with aortic stenosis

    Left ventricular hypertrophy (LVH) There are many different criteria for LVH. Sokolow + Lyon (Am Heart J, 1949;37:161) S V1+ R V5 or V6 > 35 mm Cornell criteria (Circulation,

  • 丙烯酰胺胶中肽提取和蛋白消化技术Digestion of Proteins and Extraction of Peptides from an Acrylamide Gel

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