With the expanding of ultrasonic applications, the development of ultrasonic surgical equipment has become a focus in related fields. Ultrasonic horn system is an important component of surgical equipment,and the horn resonance properties directly affect the technical performance of ultrasonic surgical equipment. In this paper, a number of tuning and matching methods appeared in recent years are discussed, and the advantages and problems are analyzed. On the basis, foreground of the research is prospected.

Objective To summarize the clinical features of severe fever with thrombocytopenia syndrome(SFTS),to improve the understanding of the disease,and strengthen the prevention and treatment of the disease,thus to improve the survival rate.Methods To analyze the patients with SFTS in our hospital,including their clinical characteristics and treatment methods.Results Of 210 patients,115 cases were mild,95 cases were heavy cases.191 cases were cured and discharged,among them,115 cases were mild,and the others were severe in all cases.The total effective rate was 90.95%,with a total mortality of 19 cases,with a fatality rate of 9.04%.Conclusion SFTS mainly manifested as fever,fatigue,nausea,vomiting,diarrhea.The treatment is mainly symptomatic treatment of early cases can not be identified,can be added with doxycycline.Those have basic disease and poor prognosis often have severe syndromes.White blood cell,platelet count and lactate dehydrogenase are related to the prognosis of the disease.

By combining WGA-HRP retrograde tracing and immunohistochemical methods,the characteristics of the vasopressin(VP)-like immunoreactive neurons, which project to the posterior pituitary were studied. They were located subependymally, and predominately along:(1) the dorsal wall of the third ventricle at the preoptic area and posterior magnocellular paraventricular nucleus levels, (2) the ventral wall of the third ventricle at the suprachiasmatic nucleus level, and (3) at the floor of the third ventricle. Four types of the cells could be distinguished. They were found to squeeze in between the ependymal cells, bring themselves very close to the cerebrospinal fluid (CSF),or to be situated in the subependymal layer, sending some of their processes into the ependyma. The double labelled neurons were also detected subpially in the supraoptic nucleus (SON) and the retrochiasmatic nucleus. A large number of dendrites from the neurons in the SON extended toward the CSF in the subarachnoidspace. In summary, the VP-like immunoreactive neurons which projected to the posterior pituitary were very close to the CSF. It is, therefore, proposed that these neurons may monitor changes in the CSF and adjust the secretion of VP in the posterior pituitary. They may also release VP directly into the CSF.

The periventricular oxytocin(OXT)-immunoreactive neurons of the 3 third ventricle in the rat were studied under electron microscope by using pre-embedding PAP immunocytochemistry. Special attention was payed to the relationship between OXT-containing neurons and ependymal cells and the synaptic architecture of these neurons in the periventricular neuropil. The results revealed that the positively immunostained cell bodies and larger, dendrites of neurons were just beneath ependyma and contacted directly with ependymal cells. Typical Gray Ⅰ type or untypical axon-dendrite synapses were found between the immunolabelled neurons and unlabelled axon terminals. A cross section of a immunoreactive process was seen on the luminal surface of ependymal cells in one case. In the subependymal neuropil many synapses formed by OXT-immunoreactive dendrites and non-immunoreactive axon terminals which contained different kinds of synaptic vesicles were encountered. It is suggested that the subependymal neurons may be important in signal integation between cerebrospinal fluid and neuronal inputs. It is also possible that the subependymal neurons may release peptides,i, e. oxytocin into CSF.

Breast cancer stem cells comprise a sub-population, which enables the capacity for self-renewal and the potentiality for differentiation and high tumorigenicity. Growing evidence suggests that breast cancer stem cells most likely contribute to tumor generation, progression, relapse, metastasis and therapeutic resistance. Herein, the recent advances in breast cancer stem cells were highlighted in this review.

Object To investigate the synthesis of alkaloids by cell suspension cultures of Datura metel L. Methods Cultured cells derived from leaves of D. metel were m aintained in Murashige and Skoog (MS) liquid medium. The effects of different c arbohydrated, different inoculum sizes, and different pH values of medium as aff ecting facters on cell growth and alkaloid formation were studied. Re sults The optimum carbohydrate was sucrose, inoculum size (1.5 - 2. 0 g/L) for fresh weight and initial pH values (5.5-6.0) of the medium were benefit for cell growth and alkaloid synthesis in the suspension cultures. The synthesis of alk aloids was improved when exogenous phenylalanine added to the culture. Conclusion Suspension-cultured cells of D. metel c an be used to synthesize alkaloids.

As a major venue of scientific research activities,medical colleges and institutes are also an importance source of providing highly trained medical talents.With the medical education reform deepen,scientific research is now becoming the focus point of exploring the social aspect of medicine.Taking one military medical university as example,this paper demonstrated four specific measures for managing social sciences research in medical colleges.

Objective:To explore diagnostic value of 6min walking test (6MWT) for coronary heart disease (CHD) . Methods :A total of 192 patients suspected of CHD ,including 123 men and 69 women ,who were treated in our hos‐pital ,were selected .After hospitalization ,all patients received 6MWT and coronary angiography (CAG) examina‐tion .With CAG results as the gold standard for diagnosing CHD ,sensitivity ,specificity ,accuracy ,positive predic‐tive value and negative predictive value of 6MWT diagnosing CHD were calculated ,and they were compared be‐tween men and women .Detections of 6WMT among groups of different diseased number of vessels were compared . Results :With CAG results as the standard ,accuracy ,specificity ,sensitivity ,positive predictive value and negative predictive value of 6MWT diagnosing CHD were 71.35% ,80.58% ,60.67% ,72.97% and 70.34% respectively . Compared with female patients ,there were significant rise in accuracy (57.97% vs .77.24% ) ,sensitivity (39.29%vs .70.49% ) ,specificity (70.73% vs .83.87% ) and positive predictive value (47.83% vs .81.13% ) , P<0.05 or<0.01 ,and significant reductions in false positive rate (29.27% vs .16.13% ) and false negative rate (60.71% vs . 29.51% ) in male patients (P<0.05 or <0.01) ,there was no significant difference in negative predictive value be‐tween two groups (P>0.05) .Compared with single - and double -vessel coronary disease ,there was significant rise in true positive rate (43.75% ,54.05% vs .100% ) of triple - or multi -vessel coronary disease diagnosed by 6MWT , P< 0.01 both . Conclusion:The 6min walking test possesses high specificity and sensitivity diagnosing CHD ,and its diagnostic value is higher for male patients and patients with serious condition .Its procedures are sim‐ple with low cost and no damage to patients ,which can be used as adjunctive examination for CHD diagnosis and ex‐tended in clinic .

This paper presents the situation of secrecy management at colleges and universities,and analyzes the reasons for the inadequacy of capability in this aspect.From the perspective of PAEI management roles,we point out the solutions to improve the capability include strengthening leaderships,targeting,building system,managing risks and raising awareness of secrecy.

Objective To investigate the clinical efficacy of stiletto needle acupuncture plus conventional acupuncture in treating cervical vertigo. Method Sixty patients with cervical vertigo were randomly allocated to treatment and control groups. The treatment group of 30 patients received stiletto needle acupuncture plus conventional acupuncture and the control group, conventional acupuncture alone. An assessment was made using the modified Cervical Vertigo Symptom and Function Evaluation Scale in both groups before and after treatment. Result After two courses of treatment, the total efficacy rate was 93.3% in the treatment group and 73.3% in the control group; there was a statistically significant difference between the two groups (P<0.05). There was a statistically significant pre-/post-treatment difference in the symptom score in the two groups and post-treatment difference in the symptom score between the two groups (P<0.01). Conclusion Stiletto needle acupuncture plus conventional acupuncture has a definite therapeutic effect on cervical vertigo. Its therapeutic effect is superior to that of conventional acupuncture alone.