1.Detection of Legionella pneumophila in Water From Cooling Tower of Centralized Air Conditioning System
Zhi CHEN ; Yibing LONG ; Yan XIONG
Journal of Environment and Health 1993;0(01):-
Objective To explore the contamination by Legionella pneumophila in cooling water of centralized air condi-tioning system in hospitals and hotels.Methods In Aug2001,the water from cooling towers of centralized air conditioning sys-tems in4hospitals and2hotels were sampled in W city.The membranes filtering the cooling water samples were treated by hy-drochloric acid.After treatment,the mixed treated solution was inoculated into GVPC plate and cultured in candle jar.The susepectable colonies were identified by biochemical test,serological test and PCR test respectively.Results5strains of L pneu mophila in cluding3strains of Lp1type and2strains of Lp5type were isolated from water samples of the cooling towers of centralized air conditioning systems in2hospitals and one star-grade hotel in W city.Conclusion The contamination by le-gionella in water of cooling tower of centralized air conditioning system in hospitals and hotels should be monitored closely.
2.Fracture resistance and failure patterns of open apex root teeth with different posts after endodontic treatment.
Qiuhui, LI ; Ping, YAN ; Zhi, CHEN
Journal of Huazhong University of Science and Technology (Medical Sciences) 2011;31(2):271-6
The aim of this study is to investigate the influence of different posts on the fracture mechanics of endodontically-treated teeth with open apex. Forty-eight human maxillary anterior teeth were collected, and the root was transversely sectioned 12 mm under the cementoenamal junction (CEJ). These samples were then randomly divided into two groups, i.e., minor diameter open apex root (group A) and major diameter open apex root (group B), with mineral trioxide aggregate (MTA) placed into the apical 4 mm in the root canals. Subsequently, both groups were respectively further divided into three subgroups as follows: fiber-post (subgroup 1), metal post (subgroup 2) and non-post (subgroup 3) group. Teeth were restored with a composite resin crown and tested by using a universal testing machine at the rate of 1 mm/min cross-head. Values of the maximum fracture resistance and failure patterns were recorded and compared among all subgroups. In addition, the changes of MTA properties were carefully examined via X-ray photography. Our results indicate that (1) In group A, the mean value of fracture resistance for teeth restored with fiber posts were statistically higher than that with either metal post or non-post; (2) In group B, there was no statistically significant difference in the mean value of fracture resistance among three subgroups; (3) No statistical significance in the mean value of fracture resistance was found between group A and group B; (4) The failure modes of most samples (58%) were irreparable; (5) MTA in two teeth developed cracks after loading tests. In conclusion, endodontically-treated teeth restored with fiber posts are more resistant to fracture than those restored with either metal posts or non-post, and most of the fracture modes are catastrophic in nature.
3.Analysis and treatment of the recurrent retinal detachment after silicone oil injection.
Xin XIE ; Zhi-qing CHEN ; Yan WENG
Journal of Zhejiang University. Medical sciences 2003;32(2):159-161
Adult
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Aged
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Female
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Follow-Up Studies
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Humans
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Male
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Middle Aged
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Recurrence
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Retinal Detachment
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etiology
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surgery
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Silicone Oils
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therapeutic use
4.Microsurgical treatment of the thenal wounds
Zhi CHEN ; Chunhui WU ; Zhijian YAN
Chinese Journal of Microsurgery 2000;0(04):-
Objective To explore the methods in repairing the thenar wounds by microsurgical technique Methods Since 1989, thenar wounds were restored with transfer of superficial or deep palmar arch, recombine of thenar muscle flap Patch of nerve and transplantation of flap on 21 cases Results The thumb and flap were survived The two point discrimination was 5 to 10 mm The thenar muscle streugth reached MRC 4 with satisfactory oppones fuction Conclusion The thenal wounds cna be obtained good effect being repaired by microsurgical technique
5.Treatment of 7 patients with medial meniscal cyst under arthroscopy.
Yan-guo HE ; Min WEI ; Zhi-qiang ZHANG ; Chao CHEN
China Journal of Orthopaedics and Traumatology 2014;27(8):642-644
OBJECTIVETo investigate clinical effects of arthroscopy in the treatment of medial meniscal cyst.
METHODSFrom June 2011 to January 2013, 7 patients with medial meniscal cyst were treated with arthroscopy. There were 3 males and 4 females,ranging in age from 27 to 63 years old,with a mean age of (43.93±2.10) years old. The cysts have been discovered for 3 to 30 months,with a mean time of (10.6±1.3) months. All the patients complained of knee pain,especially in the medial joint gap. The Pisani sign, Caklin sign and medial McMurray sign were all positive. Preoperative MRI examination confirmed the diagnosis. Lysholm score changes and clinical efficacy were observed through a six-month follow-up.
RESULTSThe postoperative Lysholm scores were all significantly higher than the preoperative scores. According to Sarimo standard, 6 patients got an excellent result, and 1 good.
CONCLUSIONArthroscopic treatment of medial meniscal cyst has replaced the traditional method, which could retain the normal meniscus as much as possible and repair the meniscus injury simultaneously, as well as get a good curative effect and a good recovery of knee function. This method is worthy of clinical application.
Adult ; Arthroscopy ; methods ; Cysts ; physiopathology ; surgery ; Female ; Humans ; Male ; Menisci, Tibial ; physiopathology ; surgery ; Middle Aged
6.Diffusion tensor imaging(DTI) and its application in visual development and amblyopia research
Junjie, ZHI ; Yongxin, XING ; Hong, YAN ; Jun, CHEN
Chinese Ophthalmic Research 2010;28(3):281-284
Diffusion tensor imaging(DTI) is an efficient and noninvasive tool to investigate the characteristics and functions of white matter fiber tracts,and it can be used to study the relationship between the structure and function in the nervous system,the plasticity and damage repair of visual development,abnormalities of the white matters that relate to the visual pathways.Recently,the quantification of white matter fiber tracts from the lateral geniculate bodies to the occipital lobe visual cortex using DTI offers morphological information for the function and structure of the white matters during visual development.Some studies attempt to compare the DTI outcomes and tractography between amblyopic children and normal children so as to better display the variations of optic radiation in children with amblyopia,and to evaluate the relationship between structure and function of the white matters.DTI becomes an important supplementary research approach in these fields.This paper reviews the application of DTI in visual development and amblyopic eyes.
8.Literature review on premarketing and postmarketing evidence of xiyanping injection.
Zhi-Fei WANG ; Xiao CHEN ; Wen ZHANG ; Yan-Ming XIE
China Journal of Chinese Materia Medica 2014;39(18):3637-3640
This article systematically summarizes the non-clinical safety studies, pharmacological studies and postmarketing safety studies of Xiyanping injection based on literature. These studies include acute toxicity test, long-term toxicity test, reproductive toxicity test, active and passive anaphylaxis test, curative mechanism study, clinical trials of effectiveness, active surveillance, security analysis of passive monitoring data, the real world analysis of hospital information system (HIS) data, literature analysis, etcetera This article also analysis the relationship of the different evidence, summarizes the strategy of the researches, in order to make it to be a reference for making a systemic research program of traditional Chinese medicine injection.
Drugs, Chinese Herbal
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administration & dosage
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adverse effects
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Injections
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Medicine, Chinese Traditional
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methods
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Product Surveillance, Postmarketing
10.Effects of glycyrrhizic acid and solid dispersions of curcumin on anti-oxidation and components of lung lavage fluid of SiO2 exposed rats.
Gang HAN ; Lin-Qi YAN ; Zhi-Yuan CHEN
Chinese Journal of Industrial Hygiene and Occupational Diseases 2010;28(4):289-290
Animals
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Bronchoalveolar Lavage Fluid
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chemistry
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Curcumin
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pharmacology
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Glycyrrhizic Acid
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pharmacology
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Lung
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drug effects
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metabolism
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Male
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Rats
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Rats, Wistar
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Silicon Dioxide
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toxicity