[Decomposition of different plant litters in Loess Plateau of Northwest China].

Taking the litters of species Hippophae rhamnoides, Medicago sativa, Populus simonii, Robinia pseudoacaci, Salix psammophila, and Stipa bungeana in the Loess Plateau of Northeast China as test objects, and by using mesh bags, this paper studied the dynamic changes of the litters mass, carbon, and nitrogen during decomposition after buried in the field in semiarid region. The litters buried were from one, two, or three of the plant species, and mixed thoroughly with equal proportion of masses. During decomposition, the mass loss rate, total carbon and nitrogen release rates, and total soluble carbon and nitrogen contents of different litters were higher at the early than at the later decomposition stage.

[The anatomical feasibility analysis of posterior laminar screw fixation techniques in upper thoracic vertebrae].

Objective: To investigate the anatomical feasibility and the technique of T(1)-T(3) crossing laminar screws fixation in the adult population.

Methods: There were 33 dry upper thoracic vertebras specimen which included respectively T(1), T(2), T(3) were studied. Spinous process height (Hs), bilateral laminar height (H), length of superior laminar screws (Ls), length of inferior laminar screws (Li), bilateral thickness of laminar (TL) and crossing angle the laminar (A) were measured.

[Effects of combined application of maize- and horsebean straws on the straws decomposition and soil nutrient contents].

A laboratory incubation experiment was conducted to study the straw decomposition and soil nutrient contents after single and combined applications of maize- and horsebean straws. With the single application of maize straw, the mineralization rates of the straw and soil organic C were lower, and the immobilization of soil mineral N sustained longest. Combined application of maize- and horsebean straws promoted the mineralization of the straws organic C and soil immobilized N.

[Contents and biodegradation of soluble organic carbon in different plant residues from the Loess Plateau].

Soluble organic carbon (SOC) in plant residues extracted by water or different extractants is an active component, and has important roles in carbon and nitrogen biogeochemical process in soil ecosystem. Reestablishing the vegetation on the Loess Plateau is changing the types and amounts of the plant residues into soil ecosystem. Therefore, our objective was to evaluate the contents and biodegradation of SOC of residues of different species from this region.

[Soluble organic carbon in plant litters on Loess Plateau: content and biodegradability].

The litters of eight plant species from the Loess Plateau were cut into pieces with 2 mm and 1 cm in size, and extracted with distilled water and 0.01 mol x L(-1) CaCl2 to determine the soluble organic carbon (SOC) content. In the meantime, a 7-day indoor incubation test was conducted at (25 +/- 3) degrees C to investigate their biodegradability.

[Effects of Huoxue Zhitong decoration on transmembrane protein I and II induced apoptosis of signal transmission of the epidural scar tissue].

Objectives: To study the effect of Houxue Zhitong decoration on the expression of the mitochondria-initiated apoptosis pathway and transmembrane protein I an II of the epidural scar tissue.

Methods: A total of 60 New Zealand rabbits (weight: 2.5-3.

[Effects of Huoxuezhitong recipe on the pathway of mitochondrial apoptosis and the expression of related gene in epidural scar tissue].

Objective: To study the effect of Huoxuezhitong recipe on the pathway of mitochondrial apoptosis and the expression of related gene (Caspase-3, -9, Bax, Bcl-2) in epidural scar tissue.

Methods: A total of 60 New Zealand rabbits, ranging in weight from 2.5 to 3.

[MRI finding of the lumbar foraminal stenosis and its clinical significance].

Objective: To observe morphological changes of lumbar intervertebral foramen and pathologic changes around the nerve root and to explore the main evaluation index for lumbar foraminal stenosis (LPS) in parasaggital MRI finding.

Methods: From Jan. 2007 to Aug.

Treatment of lumbar and lumbosacral spinal tuberculosis with minimally invasive surgery.

Objective: To evaluate the outcome of computed tomography (CT)-guided percutaneous puncture and local chemotherapy for tuberculosis (TB) of the lumbar or lumbosacral spine.

Methods: From January 2002 to August 2006, 49 patients with lumbar or lumbosacral spinal TB in whom conservative treatment had failed were treated by minimally invasive surgery. There were 21 female and 28 male patients.

[Progress of lumbar interspinous process spacer].

Lumbar interspinous process spacer, as a important aspect of dynamic stabilization system,through implant a spacer into interspinous process, which can limit the extension of the pathological segment, reserves the physiological activities basically, increases the volume of the spinal canal and intervertebral foramina, decreases the loading of the posterior of disc, and it doesn't affect the motion and the loading of the adjacent segment significantly. From the available documentary, the biomechanical and clinical results of various lumbar interspinous process spacers were optimistically. The purpose of this paper is to review these investigations in respect of lumbar interspinous process spacers.

[Comparison of penetration and obturation density using nickel-titanium and stainless-steel spreader in curved canals].

Objective: To compare the initial penetration depth of nickel-titanium (NiTi) and stainless-steel (SS) spreader during lateral compaction and the quality of the seal in curved canals.

Methods: Forty extracted mandibular premolars with a single curved canal were divided into two groups: no more than 20 degrees and more than 20 degrees based on degree of curvature. All canals were instrumented using a rotary instrumentation technique.