[Determination Method and Characteristics of Particle Size Multiplier of PM in Road Dust].

The particle size multiplier is a valuable parameter for depicting the particle size distribution characteristics of road dust and calculating road dust emissions. In order to realize the localization of the particle size multiplier, the AP-42 and TRAKER methods were used for sampling on typical and different types of roads in Baoding in March 2019. Then, the particle size multiplier of road dust PM () was calculated using the correction formula, and the characteristics were analyzed.

[Validity study of Coda Motion Analysis System for measuring cervical lateral flexion in normal adults].

Objective: To investigate the validity of Coda Motion Analysis System for measuring cervical lateral flexion in normal adults in order to explore a new measuring tool for clinical and research practice.

Methods: A total of 43 participants were involved in the study. Cervical range of lateral flexion were measured with Coda Motion Analysis System and "gold standard" X-ray simultaneously.

Ebselen protects mitochondrial function and oxidative stress while inhibiting the mitochondrial apoptosis pathway after acute spinal cord injury.

Ebselen is a fat-soluble small molecule and organic selenium compound that regulates the activity of glutathione peroxidase to alleviate mitochondrial oxidative stress and improve mitochondrial function. In the present study, we aimed to investigate the effects of ebselen on mitochondrial oxidative stress response, mitochondrial apotosis, and motor behaviors after spinal cord injury (SCI). We found that ebselen significantly increased the BBB score in motor behavior, thus suggesting a rescue effect of ebselen on motor function after SCI in rats.

[Change of 3D cervical range of motion after single-level anterior cervical corpectomy and fusion].

Objective: To study the change trend of cervical range of motion(ROM) after single-level anterior cervical corpectomy and fusion(ACCF) in treating cervical spondylotic myelopathy.

Methods: The clinical data of 23 patients with cervical spondylotic myelopathy was retrospectively analyzed from February 2015 to April 2016. There were 11 males and 12 females, with an average age of (54.

[Unilateral versus bilateral pedicle screw fixation in minimally invasive transforaminal lumbar interbody fusion(MIS-TLIF): a Meta analysis].

Objective: To compare the clinical outcome between unilateral and bilateral pedicle screw fixation in minimally invasive transforaminal lumbar interbody fusion(MIS-TLIF) for the treatment of lumbar degenerative diseases.

Methods: The studies concerning unilateral or bilateral pedicle screw fixation in MIS-TLIF for the treatment of lumbar degenerative diseases from January 2000 to October 2015 were searched from Medline, Embase, The Cochrane Library, China Biology Medicinedisc and Wanfang database, China National Knowledge Internet (CNKI). The data of the studies were collected, risk of bias of the included RCTs were assessed according to Cochrane handbook 5.

[Study of olfactory ensheathing cells transplantation and treadmill training on improving hindlimb motor function of spinal cord injury rats].

Objective: To investigate the effects of olfactory ensheathing cells (OECs) transplantation and treadmill training in improving hindlimb motor function of spinal cord injury(SCI) rats and explore its possible mechanism.

Methods: A total of 80 male SD rats were randomly divided into four groups: media untrained (group A), OECs untrained (group B), media trained (group C) and OECs trained(group D). Each group had 20 rats and all rats were made the model of spinal cord injury.

[Association between incidence of idiopathic ventricular tachycardia and risk factors with short-term effects: a case-crossover study].

Objective: To explore the transient risks regarding idiopathic ventricular tachycardia (IVT).

Methods: A symmetric bidirectional case-crossover design was used to estimate the short-term risk of IVT. In the case-crossover design each case served as its own matched control while case-period were compared to two control-periods, 7 days before and after the case-period.