In 2013, China imported 282 million tons of crude oil with an external dependence of 58.1%, surpassing the USA as the world’s largest net oil importer. An import source diversification strategy has been adopted by China to ensure oil supply security and to prevent oil supply disruption. However, the strategy is restricted by the imbalance of oil reserves. What is the reasonable and clear object...

Background: Sagittal imbalance is known as the main radiographic driver of disability in adult spinal deformity (ASD).In this study, the association of radiological spinopelvic parameters and clinical outcomes was evaluated following thecorrective surgery of sagittal imbalance, in order to explore the predictive ability of each parameter.Methods: A total of 23 patients, who underwent corrective...

The most common cause of iatrogenic flatback syndrome is Harrington distraction instrumentation extending into the lower lumbar spine. Other common causes and exacerbating factors include failure to enhance regional lordosis during lumbar fusion for degenerative spondylosis, development of pseudarthrosis or postoperative loss of correction, development of kyphosis at the thoracolumbar junction,...

酸 ま た は アル カリ が最 初 に 分 布 す るの は 細 胞 外 液 で あ り,こ の緩 衝 能 は 大 き く,350mEqの 酸 を加 え て もpHは7.40か ら7.00に 変 化 す る に留 ま る.次 い で肺がPco2を 変化 させてpHの 変動を最小限に抑 え,第3に 細胞内の緩衝作用が働 く.細 胞内の緩 衝は負荷条件によつて異なるが,そ の緩衝能は一 般に細胞外液よりも大きい 腎の排泄作用は始動 が遅 く,酸 排泄は24時間後から,ア ルカリ排泄は 6~8時 間後から開始される.負 荷された酸やア ルカリの体外排泄には時間がかかるが,こ の間は 体内の緩衝作用が働 くから,血液pHは 殆 ど変化 し ない。 3.肺 と腎の緩衝作用 Pco2は 換気によつて調節され,換 気は呼吸中枢 によつて調節 されている.Pco2お よびpHの 変化 は,大 動脈...