In the present study,the trachea of 17 new borns and 10 animals, including rabbits, dogs and monkeys were used. The neural elements were visualized by Cajal-Faworsky silver impregnation and osmic acid techniques. Specimens were cut in to sections by freezing microtome and stained by Gros—Bielchowsky method.Branches from the recurrent laryngeal and vagus nerves pass to the trachea,dividing and rejoining to form a mesh-like plexus outer to the cartilage. Fibers of the posterior parts of the plexus appear as a well-defined longitudinal chain of nerves. The branches from this plexus re-form a primary, secondary and tertiary plexuses in the membrane of cartilage plates, in the muscle, the submucous regions and the mucosa.Parasympathetic effector neurons were mostly found in the posterior and lateral wall, on rare occasions the anterior wall.A profuse supply of predominantly unmyelinated fibres innervates the muscle,blood vessels and glands, and the plexuses supplying these structure apparently communicate with each other. They also contain some thinly myelinated fibres.In the layer of smooth muscle the nerve fibres give off fine collaterals and end in knob-like or arrowheaded swellings. The fibres of subepithelial plexuses branch rectangularly and pass between the epithelial cells. All these fibers terminate in knobs which lie among the deep epithelial cells.

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Endemic dental fluorosis has been reported in some regions of the world. China seemed to have high prevalence of endemic dental fluorosis, especially in southwest China. It is now most likely that excessive fluoride intake during enamel development play a key role in the pathogenesis of dental fluorosis. However, excessive intake of fluoride-induced cellular and molecular mechanisms of dental fluorosis are not entirely conclusive. Scholars at home and abroad have made a lot of research on pathogenesis of enamel fluorosis by using various experimental techniques. More recent studies mainly suggest that endoplasmic reticulum stress and calcium overload-associated apoptotic pathway may participate in fluoride excess-evoked pathogenesis of dental fluorosis. Furthermore, the functional changes of enamel matrix protein and protease activity may be involved in the pathological event. This paper summarized the recent research progress on this topic.

Atrial fibrillation ( AF) is an abnormal heart rhythm characterised by rapid and irregular beating.It is caused by multiple factors and can lead to ischemia-associated thrombosis, heart failure and other complex symptoms. Based on the etiology and characteristics of AF, animal models have 3 main categories including electrical, neurohormonal or vessel-related, and structural remodeling models.New technologies such as microRNA knock-down/overexpression or CRISPR-Cas9 gene editing provide tools for constructing animal AF models and directions in the development of AF thera-peutic strategies.Currently these strategies have largely focused on the cellular and molecular therapeutics rather than tradi-tional invasive electrophysiological methods or antiarrhythmic drugs.With the aid of new tools, progress has been greatly made in a broad range of therapeutic research areas including molecular mechanisms, drug targeting and screening.This re-view summarizes the animal models of atrial fibrillation currently used in studies of the molecular and cellular therapeutics and notes their contributions to this research area.

Objective To investigate the present situation of quality of life in the elderly residents aged more than 60 years in Zhanjiang city and to analyze its influence factors .Methods 418 elderly residents over 60 years sampled by the random sampling in Zhanjiang city were performed the questionnaire survey by using the Chinese Scale of World Health Organization QOL (WHOQOL-BREF) .Results The quality of life in the physical ,psychological and environmental fields in male residents was higher than that in the female residents ;which in the psychological and environmental fields in the high cultural level residents was higher than that in the low cultural level residents ;which in the social relations field in the high income residents was higher than that in the low in-come residents ;there were no statistical differences in the quality of life among the elderly residents with different occupations be-fore retirement and marital status ;the Logistic regression analysis showed that gender and occupation were the influence factors of quality of life self evaluation in elderly residents .Conclusion Gender ,occupation ,educational level and income level are the influ-ence factors of quality of life in elderly residents .

0.05). Psychogenic mental disorders were resulted from organic brain damage, while non-phychogenic mental disorders were found in cases of brain functional in-jury. Among which brain contusion and laceration occupied 54.8% , concussion 21.4% and brain stem in-jury 16.7%. The difference was very significant between the above two types (P

Aim To observe the change of amyloid, acetylcholine transferase and glial fibrillary acidic protein expression in Macaca Rhesus hippocampal after infused the Aβ_(1-42) and thiorphan and explore the possibility of the establishment of Macaca Rhsus AD model in brain.Method The Rhesus monkeys were anesthetized (im), the skull was exposed by a midline scalp incision, and oriented craniotomy was performed on left side by dental drill.First, neprilysin in cerebral cortex and basal nucleus was consumed by infusion thiorphan. Then cerebral cortex and basal nucleus were slowly infused with fibrilla Aβ_(1-42). Finally, the cannula for thiorphan infusion was implanted into the basal nucleus.Miniosmotic pump (Alzet MODEL 2ML4,) was subcutaneously fixed by bio gel 454 on the calvaria (Loctite Co. Ltd,USA) according to the manufacturer's instructions.After 50 days' survival, animals were deep anesthetized with ketamine and sacrificed. The pathological changes were observed by HE staining and immunostaining in monkey brains.Result Neuronal loss and a proliferation of microglia were detected in hippocampal formation by HE staining.Immuno-staining showed Aβ_(1-42),ChAT and GFAP positive cells density were 0.59±0.05,0.21±0.04 and 0.19±0.04 separately.Compared with control group, the density in experimental groups showed distinct difference in statistic analysis (P<0.01).Conclusion The same pathological change was detected in the thioaphan and Aβ_(1-42) infusion in Macaca Rhesus hippocampal formation as what was found in AD patients.

Objective To investigate the possibility that procalcitonin (PCT) can predict the outcome of ventilator weaning in patients with acute exacerbation of chronic obstructive pulmonary disease(AECOPD). Methods The AECOPD patients caused by bacteria who received mechanical ventilation in intensive care unit (ICU)of the General Hospital of China National Petroleum Corporation in Jilin from January 2010 to March 2014 were retrospectively selected,and their venous blood PCT levels were monitored daily. When they had passed the spontaneous breathing trial(SBT),their breathing machine and trachea cannula were removed. Afterwards they were closely observed for 48 hours and divided into two groups:success and failure groups according to the outcome of the first weaning,and then the analysis of the PCT difference between the two groups was made. Results In the 52 patients enrolled,there were 38 patients in the success group and 14 patients in the failure group. The baseline information as age,sex,acute physiology and chronic health evaluationⅡ(APACHEⅡ)score between the two groups showed no significant difference(all P>0.05). There was no statistical significant difference in PCT level(μg/L) between success and failure groups when they were admitted(5.33±1.35 and 5.37±1.34,respectively). When they were weaning,the PCT levels of both groups had reduced to some extent(1.37±0.39 and 1.74±0.42,respectively), and the success group was lower than that in the failure group(t=2.971,P=0.005). Conclusion PCT level can be used as a predictive index to guide the time for ventilator weaning in patients with AECOPD.

Objective SD rats were immuned with the transgenic tomatoes which carried fused gene of a region of PAc Strep-tococcus mutants and cholera toxin B subunit.The immunogenicity was tested to explore secure and economic edible vaccines a-gainst dental caries.Methods A total of 18 eighteen-day-old female SD rats were subdivided randomly into three groups:the exper-imental group which were fed with transgenic tomato juice containing chimaera protein PAcP/CTB;the positive control group which were treated with deactivated S.mutans;the negative control group which were not treated with transgenic tomato juice.Rats were immuned once per week for four weeks.Blood and saliva were collected at one day before the first immunity and one week after each immunization.IgG of blood serum and SIgA of saliva were detected using the enzyme-linked immunosorbent assay (indirect ELISA) testing.On day 70,rats were terminated.The maxillary and mandibular bones were subsequently taken out to count dental caries′scores.Results Post immunization,the experimental group and the positive control group had statistical significant levels of speci-ficity IgG in serum and SIgA in saliva compared to the negative control group (P <0.05).There was a significance difference be-tween the experimental group and the negative control group except in Dx levels of caries loss (P <0.05).Conclusion The targeted protein expressed on the transgenic tomatoes is immunogenic,which can effectively induce mucous membrane immune response and the systematical immunoreaction to suppress the occurrence of the dental caries.

Conservative endodontic access cavity (CEC) is the first step of minimally invasive endodontics. After that operation, teeth retain the dental hard tissue, such as crest and peri-cervical dentin, to a large extent. It is of great significance to reduce the tissue excision and achieve a favorable prognosis. There are a variety of approaches and corresponding cavities in CEC. The methods to determine the medullary approach include X-ray localization, micro CT/cone beam CT localization and digital guide plate localization. Among them, X-ray film and micro CT/cone beam CT are simple and commonly used in the clinic. For more complex root canal systems, the use of a digital guide plate can establish a more accurate pulp opening pathway and reduce the unnecessary loss of tooth hard tissue. However, the positioning price of a digital guide plate is high, and it has not been widely used in the clinic. The hole types of CEC include minimally invasive medullary hole type, super conservative minimally invasive medullary hole type, "Truss" hole type and cutting end hole type. The stress analysis of CEC and traditional endodontic access (TEC) cavity are mainly based on the loading of teeth by a universal mechanical testing machine in vitro, finite element analysis and clinical observation. Most scholars’ studies have shown that minimally invasive endodontics can improve the fracture resistance of teeth, but the differential capacities of CEC and TEC remain controversial. How does on balance the purpose of pulp treatment and the maximum retention of tooth tissue? Further exploration is still needed.