In the present study, the results were as follows: ( 1 ) Thyro-tropin-releasing hormone ( TRH ) injected into the intracerebroven-tricle increased intragastric pressure & evoked the phasic contraction of stomach significantly. ( 2 ) The increased response was decreased by bilateral destruction of dorsa. motor nucleus of vagus. ( 3 ) The increase was abolished completely by either vagotomy or atropine.The aforementioned results indicate that the action of dors. motor nucleus of vagus is partly involved the central mechanism of gastric movement induced by TRH & the vagal is the efferent pathway.

Objectlve To study the properties of goat tooth enamel electron spin resonance (ESR)dosimetry.Methods Tootll enamel samples of goats were achieved by combined mechanical and chemical treatment at the ages of l,2,3,5,and 6 years.respectively and 9 enamel samples of adult molar were obtained.These enamel samples were exposed to 137Cs γ-rays at the cumulative doses of 0,0.5,1.0,2.0,and 5.0 Gy,respectively.ESR spectra Was measured before and after exposure.Results The background signal of goat tooth samples W88 21.5,significantly lower than that of the adult molar samples(39.5).The dusimetric signal intensity of the goat enamel increased with the radiation dose in a linear manner just as that of the human molars.The average radiation sensitivity of the goat tooth samples was(34.3±1.9)/Gy,close to that of the human tooth samples.Conclusions Goat teeth can be used for retrospective radiation dose reconstruction when human teeth are unavailable,in order to previde scientific data for dose reconstruction accurately.

ObjectiveTo investigate the effects of partial hepatic ischemia/reperfusion (I/R) on choline acetyltransferase(ChAT) expression in hippocampal neuron in mice.MethodsOne hundred adult male mice,aged 2 months,weighing 20-25 g,were randomly divided into 5 groups (n =20 each): normal control group(group C),sham operation group(group S),groups I/R1,I/R2,I/R3.Partial hepatic ischemia was produced by clamping left hepatic artery and portal vein for 20,30,40 min respectively followed by reperfusion in groups I/R1,I/R2,I/R3.Passive avoidance task was performed with 10 mice in each group at 4-9 and 18-23 d after operation respectively.The animals were sacrificed and their brains were removed for determination of the expression of ChAT in CA3 of hippocampal neuron.ResultsCompared with group C,the latency was significantly shortened and number of errors increased in groups I/R1 and I/R2 at 4-7 d after operation and in group I/R3 at 4-9 d after operation,the expression of ChAT in hippocampal neuron down-regulated in groups I/R1,I/R2 and I/R3 at 9 d after operation( P ＜0.05 or 0.01).There was no significant difference in the latency and number of errors at 18-23 d after operation and the expression of ChAT in hippocampal neuron at 23 d after operation among groups C,I/R1,I/R2 and I/R3 ( P ＞ 0.05).Compared with group I/R1,the number of errors was significantly increased at 4 and 5 d after operation in group I/R2,the latency shortened at 4-6 d after operation and number of errors increased at 4-9 d after operation in group I/R3,and the expression of ChAT in hippocampal neuron down-regulated at 9 d after operation in groups I/R2 and I/R3 ( P ＜ 0.05 or 0.01 ).There was no significant difference in the latency and number of errors at 18-23 d after operation and the expresson of ChAT in hippocampal neuron at 23 d after operation among groups I/R1,I/R2 and I/R3 ( P ＞ 0.05).ConclusionPartial hepatic I/R can result in transient cognitive impairment in mice by down-regulating the expression of ChAT in hippocampal neuron.

AIM To study the role of serot on in (5-HT) in ventrolateral preoptic nucleus(VLPO) on sleep and wakefulness cycl e of rat by microinjection of 5-hydroxytryptaphan (5-HTP , precursor of 5-HT ) , non-special 5-HT receptor antagonist methysergide (MS) and 5-HT retake i nhibitor fluoxetine. METHODS Stereotaxic, microinjection and po lysomnography (PSG) were used in the experiment. RESULTS There was no significant effect by microinjection of 5-HTP(0 5 ?g,0 1 ?l) into VLPO,but microinjection of 5-HTP(1 ?g,0 1 ?l)and fluoxetine lead wake i ncreased and sleep decreased; while microinjection of non-selective serotonin receptor antagonist MS lead to the opposited effect. The chang of sleep-wakefu lness cycle caused by 5-HTP or MS were significantly assiociated with time. CONCLUSION 5-HT involved in the regulation of sleep-wake cycle a nd promoted wake in the VLPO and its role of promotion may involve the gene exp ression of post-synaptic neurons.

AIM To investigate the role of serotonergic projection from dorsal raphe nuclei (DRN) to basolateral amygadaloid (BLA) in the regulation of sleep and waking state. METHODS stereotaxic microinjection and polysomnography were employed. RESULTS Microinjection of L Glu into the DRN caused an enhancement of wake (W) and a decrease of slow wave sleep (SWS) and paradoxical sleep (PS). However, microinjection of L Glu into the DRN plus bilateral microinjection of methysergide (MS) into the BLA reversed the effects of L Glu. Microinjection of PCPA into the DRN caused an enhancement of SWS and a decrease of W. Microinjection of PCPA into the DRN plus bilateral microinjection of 5 HTP into the BLA reversed the effects of PCPA. CONCLUSION These results suggest that the role of the DRN in the regulation of sleep and waking state is partly mediated by serotonergic projection from the DRN to the BLA.

BACKGROUND:Spinal cord injuries induced by sacral segment and lumbar lesions can damage the primary sacral micturition center or its surrounding nerves (parasympathetic and somatic nerve) to cause detrusor areflexia, thereby leading to urinary retention and further pathological changes in bladder tissue morphology.
OBJECTIVE:To observe the effects of electroacupuncture at the Ciliao (BL32), Zhongji (RN3), Sanyinjiao (SP6) acupoints on bladder capacity and bladder tissue morphology of rats with urinary retention after sacral spinal cord injury.
METHODS:Ten of 40 female Sprague-Dawley rats were randomly selected as blank group, and other 30 rats were randomly divided into model group, acupoint group and non-acupoint group. In the model group, the rats received no electroacupuncture. In the non-acupoint group, acupuncture and electroacupuncture at non-acupoint points were performed, respectively, for 20 minutes. In the acupoint group, acupuncture and electroacupuncture were performed at the Ciliao, Zhongji, and Sanyinjiao acupoints. Bladder capacity was measured at days 14 and 22 after treatment. After treatment, bladder tissues were extracted for morphological observation with hematoxylin-eosin staining.
RESULTS AND CONCLUSION:(1) The maximum bladder capacity in the acupoint group was obviously reduced after treatment (P<0.01);the curative effect in the acupoint group was more obvious than the non-acupoint group (P<0.05);the difference between preoperative and postoperative bladder capacity (d value) was more significant in the acupoint group than the non-acupoint group (P<0.05). (2) Compared with the model and non-acupoint groups, morphological changes in the bladder tissue were improved more significantly in the acupoint group. These findings indicate that electroacupuncture at the Ciliao, Zhongji, and Sanyinjiao acupoints can effectively reduce the maximum bladder capacity and repair the damaged bladder tissue after sacral spinal cord injury.

Objective To collect and analyze the radiation dose to patients in cardiovascular interventional procedures and the radiation dose-related indicators,in order to provide a basis for improving radiation protection of patients.MethodsThe clinical data of 26 cases of complete cardiovascular interventional procedures was collected in the municipal Grade A Class Three hospitals,including coronary angiography (CA) and percutaneous transluminal coronary angioplasty (PTCA),and the patient-received radiation doses and other related factors was studied.TLD personal dosimeter radiation field matrix method was used to measure fluorescence time,the entrance skin dose (ESD),the peak skin dose (PSD),dosearea product (DAP) and other indicators.TLD was used to measure the organ dose of the phantom under the cardiovascular interventional procedure condition.ResultsThe fluoroscopy time was (17.7 ±15.6) min during the range of 0.80-42.4 min.The average entrance skin dose (ESD) was (159 ± 138)mGy during the range of 4.40-459 mGy.The peak skin dose (PSD) was (769 ± 705) mGy during the range of 22.6 - 2.43 × 103mGy.The fluorescence time,entrance skin dose (ESD) ,peak skin dose (PSD) of the group CA + PTCA are greater than the group CA and the difference has statistical significan.The peak skin dose and the fluoroscopy time have good linear correlation (r = 0.84,P ＜ 0.01 ).Conclusion The peak skin dose the patient received in cardiovascular interventional radiological operation can be estimated through the fluoroscopy time.

Objective To explore the effects of electrical acupuncture at Ciliao (BL32), Zhongji (RN03), Sanyinjiao (SP06) acupoints on the expression of caspase-3 in bladder tissue and the urodynamics of rats with neurogenic bladder (detrusor areflexia type) after sacral spinal cord injury. Methods 10 rats were randomly selected as blank control group from 40 female Sprague-Dawley rats. The other 30 rats were randomly divided into model group, acupoint group and control group after modeling, with 10 rats in each group. The urodynamics was measured on the 14th and 22nd day after modeling. The control group and acupoint group received electrical acupuncture 7 times at the acupoints and other points nearby, respectively, from the 15th day. The expression of caspase- 3 in bladder tissue was detected with enzyme-linked immuno sorbent assay (ELISA) method. Results Compared with the model group, the maximum bladder capacity, bladder compliance and expression of caspase-3 in bladder tissue significantly decreased after treatment (P<0.01), the filling bladder pressure significantly increased (P<0.05) in the acupoint group. And the acupuncture group was better than the control group (P<0.05). Conclusion Electrical acupuncture at Ciliao, Zhongji and Sanyinjiao can reduce the maximum bladder capacity in neurogenic bladder rats and inhabit the expression of caspase-3 in bladder tissue.

Objective Exogenous small-diameter vascular grafts have been developed with tissue-engineered small-di-ameter vascular grafts for the reconstructive surgery in the treatment of patients with coronary artery diseases in whom restenosis of the initially transplanted autografts occurred.This study was conducted to develop decellularized umbilical arteries (HUAs) and evaluate their physical and mechanical properties,as well as to assess the usefulness of decellularized HUAs in the coronary artery bypass grafting procedures.Methods After HUAs were harvested,their inner diameters were measured with a sliding caliper and the blasting pressure was measured with a pressure gauge.HUAs were firstly infused with a compound liquid consisted of 0.25％ Trypsin and 0.01％ Ethylene Diamine tetraacetic Acid(EDTA) and then with 1％ Sodium Lauryal Sulfate (SDS).Fragments of the vessels were collected and observed under light microscope and electron microscope.The mechanical characteristics of HUAs were identified with an electronic experiment machine before and after decellularization.Fibroblasts and endothelial progenitor cells growing along the lining of decelluarized human umbilical arteries(dHUAs) could be observed.Results The average inner diameter of HUAs was ( 3.50 ± 0.55 ) mm.Two of thirty HUAs were broken at a pressure of 300 mm Hg.The process for the lining of HUAs to be decellularized with a peristaltic pump took 0.5 hour with 0.25％ Trypsin and 0.01％ EDTA and 3 hours with 1％ SDS.Observations with light microscope and electron microscope demonstrated that all of the original lining cells were decellularized.The ultimate stress of the HUAs did not change significantly after decellularization ( P ＞0.05 ).Attached fibroblasts and endothelial progenitor cells could be seen along the decellular lining of the grafts and the ultimate stress of the HUAs did not change significantly after implantation of the two kinds of cells.Conclusion dHUAs,with good histocompatibility and properties mentioned above,may be used as potential vascular grafts in CABG.