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Abstract］ objective to explore the accuracy and safety of safety drillprepared for cervical pedicle screw trajectory.methods fourteen adult cadaver specimens of cervical spine（c3～c7）with intact structures including ligaments and perivertebral muscles were reserved and used.according to the radiographic measurements,safety drill was inserted into cervical pedicle individually.the evaluation of the drill's trajectory was carried out by ct scan and three-dimension reconstruction and autopsy.results one hundred and forty drill's trajectories were made.9 holes failed with a perforation rate of 6.4%.conclusion the safety drill prepared for cervical pedicle screw hole is safe and effective and can be applied and popularized clinically.

目的 探索安全钻头应用于颈椎弓根螺钉孔道钻探的安全性与准确性。方法随机取14具福尔马林浸泡的成人颈椎标本（c3～c7），保留完整的脊柱三柱结构及相关的韧带和椎旁肌，根据影像学测量的进钉点和进钉方向，模拟颈椎后路手术过程。选用安全钻头，进行实际的颈椎弓根螺钉孔道的钻探，将孔道行ct扫描，并斜位三维重建孔道形态，并以肉眼直视观察结果为金标准，评价孔道钻探的成败。结果钻探孔道准确率89.3%（125/140），穿孔率6.4%（9/140）。结论安全钻头应用于颈椎弓根螺钉孔道钻探的安全性与准确性均较高，可以在临床上推广使用。

Methods A C57BL/6j mouse cumulus cell nucleus 10-12 mm in diameter was inserted into the perivitelline space of an enucleated oocyte.

方法将直径10~12mm的C57BL/6j小鼠卵丘细胞核注射到去核卵母细胞透明带下，构建供体核-卵母细胞复合体。

Peroral push-gastrostomies are preferable for palliative care and for patients with neurogenic dysphagia, but percutaneously inserted tubes should be used in patients with upper gastrointestinal cancers in order to avoid tumor seeding.

经口胃造瘘术更适用于姑息治疗和神经源性吞咽困难患者，而经皮插管则适用于上消化道肿瘤患者以避免肿瘤播散。

Peroral push-gastrostomies are preferable for palliatie care and for patients with neurogenic dysphagia, but percutaneously inserted tubes should be used in patients with upper gastrointestinal cancers in order to aoid tumor seeding.

经口胃造瘘术更适用于姑息治疗和神经源性吞咽困难患者，而经皮插管则适用于上消化道肿瘤患者以避免肿瘤播散。

The Calmodulin gene was inserted into pCambial304 plant expression vector positively and reversely. By PCR and enzyme cutting, the Calmodulin gene from Phaseolus radiatus L.

与已知的其它多种植物钙调蛋白基因相比也有很高的相似性，核苷酸序列相似性在80％以上，编码的氨基酸序列相似性在90％以上。

The trace of red O phenanthroline Fe indicates: Fe 2+ was absorbed by roots and transported to stem, main vein of leaves when iron fertilizer was root inserted.

整根对铁的吸收已有较多的研究，铁可以Fe2 +、Fe3+或铁的螯合物形式被植物吸收。

Male flowers: pedicel articulated at base; sepals 5, free, valvate, initially curved around stamens, later reflexed; petals and disk absent; stamens 5, free, inserted at bases of sepals; filaments short; anthers larger, thecae 2, parallel, introrse, dehiscence longitudinal; pistillode short and broad, peltate.

雄花 花梗有节在基部；萼片5，离生，镊合状，最初在雄蕊周围弯曲，后反折；花瓣和花盘无；雄蕊5，离生，着生在萼片的基部；花丝短；花药大，囊2，平行，内向，纵裂；退化雌蕊短和宽，盾形。

Male flowers: sepals 5, imbricate; petals 5, longer than sepals; disk absent; stamens [5 or]10 and 2-seriate, inserted on fleshy receptacle, outer ones alternating with petals, inner ones sometimes absent or reduced and scalelike; filaments free; anthers longitudinally dehiscent, 2-loculed; pistillode present.

雄花： 萼片5，覆瓦状；花瓣5，比萼片长；花盘无；雄蕊 [5或者 ]10 和2轮，着生于肉质花托，外轮与花瓣互生，内轮有时无或退化成鳞片状；花丝离生花药纵向开裂，2室；退化雌蕊宿存。

Stamens inserted at base of corolla tube; filaments connate into a tube; anther appendages incurved; pollinia 2 per pollinarium, pendulous.

雄蕊花冠筒的着生的在基部；花丝合生成筒；花药附属物弯曲；花粉块2 每pollinarium，下垂。

Corona lobes inserted on backs of anthers; pollinia erect or horizontal

花药，副花冠裂片着生于回来；花粉块直立或者水平 39 Tylophora 娃儿藤属

When this condition occurs, inbound replication with the source partner is stopped on the destination domain controller and event ID 2042 is logged in the Directory Services event log.

计算机密码学是研究计算机信息加密、解密及其变换的科学，是数学和计算机的交义学科，也是一门新兴的学科。

Instructions: click on the thumbnails to see a larger image, then use the left-right arrow keys to scroll through the slideshow.

使用说明：滑鼠点在小图上即可放大观赏。开启后键盘左右键可用来换照片。