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Wu FW, Wang LB, Li BF, Yan XL, Zi JR, Peng J, Cai X, Bao XY, Yang YM. [Prevalence of human soil-borne nematode infections in Yunnan Province: a cross-sectional study in 2015]. Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi 2021; 33:513-517. [PMID: 34791851 DOI: 10.16250/j.32.1374.2021112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
OBJECTIVE To investigate the current prevalence of human soil-borne nematode infections in Yunnan province, so as to provide the scientific evidence for formulating the soil-borne nematodiasis control strategy in the province. METHODS In 2015, a total of 20 survey sites were sampled in 10 counties (cities) of Yunnan Province using the stratified cluster random sampling method. Stool samples were collected from all local permanent residents at ages of one year and older in each survey site, and the soil-borne nematode eggs were identified using the modified Kato-Katz technique and the egg number was counted. In addition, the hookworm species was identified using the filter-paperculture method, and Enterobius vermicularis eggs were detected using the cellophane tape method in children at ages of 3 to 6 years. RESULTS A total of 5 067 residents received stool examinations, and 950 residents were detected with soil-borne nematode infections, with an overall prevalence rate of 18.75%. The prevalence of Ascaris lumbricoides, Trichuris trichura and hookworm was 7.52%, 8.47% and 9.02%, respectively. Among 446 children detected using the cellophane tape method, 5 children were detected with E. vermicularis infections. Among the 160 residents with hookworm infections, there were 139 residents with Necator americanus infections (86.88%), 16 with A. duodenale infections (10.00%) and 5 with mixed infections (3.12%). Mild A. lumbricoides (67.98%, 259/381), T. trichura (88.58%, 380/429) and hookworm infections (94.53%, 432/457) were predominant. Among the four ecological zones, the highest prevalence of human soilborne nematode infections was found in the East Tibet-South Sichuan Ecological Zone (31.79%), and among the 10 survey counties (cities), the greatest prevalence was seen in Gongshan Derung and Nu Autonomous County (50.13%), while the lowest prevalence was found in Ninglang Yi Autonomous County (0.40%). The prevalence of human soil-borne nematode infections was 5.67% (43/759), 26.67% (610/2 287) and 14.70% (297/2 021) in high-, moderate- and low-economic-level regions, respectively. There were no significant differences in the prevalence of human soil-borne nematode infections in terms of ecological regions, survey counties (cities) or economic development levels (χ2 = 342.20, 814.60 and 201.34, all P < 0.05). There was no significantdifference in the prevalence of human soil-borne nematode infections between male (18.21%, 441/2 422) and female residents (19.24%, 509/2 645) (χ2 = 0.89, P > 0.05), and soil-borne nematode infections were detected in residents at all age groups, with the greatest prevalence found in residents at ages of 1 to 9 years (25.88%). In addition, the highest prevalence of soil-borne nematode infections was seen in residents with the Dulong Ethnic Minority (82.09%), in preschool children (25.06%) and in illiterate residents (24.80%), and there was no age-, ethnicity-, occupation- or education level-specific prevalence of soil-borne nematode infections detected (χ2 = 46.50, 1 016.96, 36.33 and 52.43, all P < 0.05). CONCLUSIONS The prevalence of human soil-borne nematode infections remains high in Yunnan Province. The management of soil-borne nematodiasis requires to be reinforced among low-age children, farmers, old people and residents with low educations levels or ethnic groups.
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Affiliation(s)
- F W Wu
- Yunnan Institute of Parasitic Diseases, Pu'er 665000, China
| | | | - B F Li
- Yunnan Institute of Parasitic Diseases, Pu'er 665000, China
| | - X L Yan
- Yunnan Institute of Parasitic Diseases, Pu'er 665000, China
| | - J R Zi
- Yunnan Institute of Parasitic Diseases, Pu'er 665000, China
| | - J Peng
- Yunnan Institute of Parasitic Diseases, Pu'er 665000, China
| | - X Cai
- Yunnan Institute of Parasitic Diseases, Pu'er 665000, China
| | - X Y Bao
- Yunnan Institute of Parasitic Diseases, Pu'er 665000, China
| | - Y M Yang
- Yunnan Institute of Parasitic Diseases, Pu'er 665000, China
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Xu YX, Wang Y, Sun M, Bao XY, Lei R, Li HE, Li XT. [Comparative analysis of the clinical application of two femtosecond laser-assisted cataract operation platforms]. Zhonghua Yan Ke Za Zhi 2020; 56:530-535. [PMID: 32842336 DOI: 10.3760/cma.j.cn112142-20191113-00571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To evaluate the operability and clinical application effects of femtosecond laser-assisted cataract surgery systems of LenSx and LenSAR. Methods: This was a randomized controlled study. A total of 86 patients (90 eyes) who underwent femtosecond laser-assisted cataract surgery in Wuhan Aier Eye Hospital from April 2018 to November 2018 were enrolled and divided into two groups randomly, including 44 patients (45 eyes) in the LenSx group and 42 patients (45 eyes) in the LenSAR group. During the operation, the following observation indexes were obtained. Operational indicators included the number of docking attempts, anterior capsulotomy time, nucleus pre-treatment time, total femtosecond laser emission time, and total vacuum suction duration. Clinical outcome indicators included changes in the patient's intraocular pressure during femtosecond laser surgery, the rate of subconjunctival hemorrhage, capsulotomy integrity (yes/no), roundness and centricity of the anterior capsule opening (yes/no), the rate of anterior capsule opening tear, and the rate of posterior capsule rupture. The t-test, rank-sum test or chi-square test were used for statistical analysis. Results: There were no significant differences between groups in the age and the lens density (both P>0.05). The number of docking attempts in the LenSx group was 1 (1 to 4) and in the LenSAR group was 1 (1 to 2); there was statistically significant difference (Z =-2.23, P<0.05). The difference in the anterior capsulotomy time between the two groups was statistically significant [13.00 (10.00 to 22.00) s compared with 3.00 (1.00 to 3.00) s, Z=-8.71, P<0.05]. The femtosecond laser pre-nucleation time and total femtosecond laser emission time of the LenSx group were (16.67±3.36) s and (30.49±3.53) s, and those of the LenSAR group were (12.38±4.36) s and (15.36±4.29) s, respectively; the differences between the two groups were statistically significant (t=-5.23, -18.26; both P<0.05). The total vacuum suction duration in the LenSx group was (97.23±19.96) s, shorter than that in the LenSAR group [(123.76±16.81) s] (t=6.82, P<0.05). The intraocular pressure after femtosecond laser surgery in both groups was higher than that before surgery. The increase of intraocular pressure in the LenSAR group was (5.64±5.42) mmHg (1 mmHg=0.133 kPa), higher than that in the LenSx group [(2.99±4.66) mmHg] (t=-2.49, P<0.05). The rate of subconjunctival hemorrhage in the LenSx group was 33.3% (15/45), while it was 8.9% (4/45) in the LenSAR group; the difference between the two groups was statistically significant (χ²=6.67, P<0.05). There were no significant differences between groups in capsulotomy integrity, roundness and centricity of the anterior capsule opening, the rate of anterior capsule opening tear, and the rate of posterior capsule rupture (all P>0.05). Conclusion: The docking process of the LenSAR system is convenient, and there is less subconjunctival hemorrhage; the total vacuum suction duration of LenSx is short, and the increase of intraocular pressure is low. (Chin J Ophthalmol, 2020, 56: 530-535).
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Affiliation(s)
- Y X Xu
- Aier School of Ophthalmology, Central South University, Wuhan Aier Eye Hospital, Wuhan 430061, China
| | - Y Wang
- Wuhan Aier Eye Hospital, Wuhan 430061, China
| | - M Sun
- Wuhan Aier Eye Hospital, Wuhan 430061, China
| | - X Y Bao
- Wuhan Aier Eye Hospital, Wuhan 430061, China
| | - R Lei
- Wuhan Aier Eye Hospital, Wuhan 430061, China
| | - H E Li
- Aier School of Ophthalmology, Central South University, Wuhan Aier Eye Hospital, Wuhan 430061, China
| | - X T Li
- Aier School of Ophthalmology, Central South University, Wuhan Aier Eye Hospital, Wuhan 430061, China
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Bao XY, Li SL, Gao YN, Wang JQ, Zheng N. Transcriptome analysis revealed that aflatoxin M1 could cause cell cycle arrest in differentiated Caco-2 cells. Toxicol In Vitro 2019; 59:35-43. [PMID: 30928695 DOI: 10.1016/j.tiv.2019.03.035] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 03/22/2019] [Accepted: 03/26/2019] [Indexed: 12/20/2022]
Abstract
Being a hydroxylated metabolite of aflatoxin B1 (AFB1) and the most threatening aspect of AFB1 contamination, aflatoxin M1 (AFM1) can lead to hepatotoxicity and hepato-carcinogenicity, and possess intestinal cytotoxicity. However, little is known about the potential mechanisms of the extrahepatic effect. The aim of this study was to investigate intestinal dysfunction induced by AFM1 via transcriptome analysis. Gene expression profiling was analyzed to comparatively characterize the differentially expressed genes (DEGs) after differentiated Caco-2 cells were exposed to different concentrations of AFM1 for 48 h. A total of 165 DEGs were significantly clustered into two down-regulated patterns. Protein-protein interaction (PPI) network analysis based on Search Tool for Retrieval of Interacting Genes (STRING)suggested that 23 key enzymes mainly participated in the regulation of the cell cycle. Q-PCR analysis was performed to validate that key 12 genes (BUB1, BUB1B, MAD2L1, CCNA2, RB1, CDK1, ANAPC4, ATM, KITLG, PRKAA2, SIRT1, and SOS1) were involved. This study firstly revealed that the toxicity of AFM1 to intestinal functions may be partly due to the occurrence of cell cycle arrest, which is linked to changes in CDK1, SOS1/Akt, and AMPK signaling molecules.
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Affiliation(s)
- X Y Bao
- College of Animal Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Quality & Safety Control for Dairy Products of Ministry of Agriculture, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, PR China
| | - S L Li
- Key Laboratory of Quality & Safety Control for Dairy Products of Ministry of Agriculture, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, PR China
| | - Y N Gao
- Key Laboratory of Quality & Safety Control for Dairy Products of Ministry of Agriculture, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, PR China
| | - J Q Wang
- Key Laboratory of Quality & Safety Control for Dairy Products of Ministry of Agriculture, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, PR China.
| | - N Zheng
- Key Laboratory of Quality & Safety Control for Dairy Products of Ministry of Agriculture, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, PR China
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Bao XY, Huang WJ, Zhang K, Jin M, Li Y, Niu CZ. [A customized method for information extraction from unstructured text data in the electronic medical records]. Beijing Da Xue Xue Bao Yi Xue Ban 2018; 50:256-263. [PMID: 29643524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
OBJECTIVE There is a huge amount of diagnostic or treatment information in electronic medical record (EMR), which is a concrete manifestation of clinicians actual diagnosis and treatment details. Plenty of episodes in EMRs, such as complaints, present illness, past history, differential diagnosis, diagnostic imaging, surgical records, reflecting details of diagnosis and treatment in clinical process, adopt Chinese description of natural language. How to extract effective information from these Chinese narrative text data, and organize it into a form of tabular for analysis of medical research, for the practical utilization of clinical data in the real world, is a difficult problem in Chinese medical data processing. METHODS Based on the EMRs narrative text data in a tertiary hospital in China, a customized information extracting rules learning, and rule based information extraction methods is proposed. The overall method consists of three steps, which includes: (1) Step 1, a random sample of 600 copies (including the history of present illness, past history, personal history, family history, etc.) of the electronic medical record data, was extracted as raw corpora. With our developed Chinese clinical narrative text annotation platform, the trained clinician and nurses marked the tokens and phrases in the corpora which would be extracted (with a history of diabetes as an example). (2) Step 2, based on the annotated corpora clinical text data, some extraction templates were summarized and induced firstly. Then these templates were rewritten using regular expressions of Perl programming language, as extraction rules. Using these extraction rules as basic knowledge base, we developed extraction packages in Perl, for extracting data from the EMRs text data. In the end, the extracted data items were organized in tabular data format, for later usage in clinical research or hospital surveillance purposes. (3) As the final step of the method, the evaluation and validation of the proposed methods were implemented in the National Clinical Service Data Integration Platform, and we checked the extraction results using artificial verification and automated verification combined, proved the effectiveness of the method. RESULTS For all the patients with diabetes as diagnosed disease in the Department of Endocrine in the hospital, the medical history episode of these patients showed that, altogether 1 436 patients were dismissed in 2015, and a history of diabetes medical records extraction results showed that the recall rate was 87.6%, the accuracy rate was 99.5%, and F-Score was 0.93. For all the 10% patients (totally 1 223 patients) with diabetes by the dismissed dates of August 2017 in the same department, the extracted diabetes history extraction results showed that the recall rate was 89.2%, the accuracy rate was 99.2%, F-Score was 0.94. CONCLUSION This study mainly adopts the combination of natural language processing and rule-based information extraction, and designs and implements an algorithm for extracting customized information from unstructured Chinese electronic medical record text data. It has better results than existing work.
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Affiliation(s)
- X Y Bao
- Medical Informatics Center, Peking University, Beijing 100191, China; National Clinical Service Data Center, Beijing 100191, China
| | - W J Huang
- School of Mathematical Sciences, Peking University, Beijing 100871, China
| | - K Zhang
- Peking University School of Basic Medical Science, Beijing 100191, China
| | - M Jin
- Medical Informatics Center, Peking University, Beijing 100191, China; National Clinical Service Data Center, Beijing 100191, China
| | - Y Li
- National Clinical Service Data Center, Beijing 100191, China; Department of Hospital Management, Peking University Health Science Center, Beijing 100191, China
| | - C Z Niu
- Department of Information, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
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Peng TT, Wang Y, Bao XY. [Preliminary report on the application of femtosecond laser-assisted anterior capsulotomy in intumescent white cataract surgery]. Zhonghua Yan Ke Za Zhi 2017; 53:281-287. [PMID: 28412801 DOI: 10.3760/cma.j.issn.0412-4081.2017.04.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To assess the effect of femtosecond laser-assisted anterior capsulotomy in intumescent white cataract surgery. Methods: Retrospective case series study. One hundred and fifty cataract patients (150 eyes) from June 2014 to June 2015 in Wuhan Aier ophthalmology hospital were enrolled in this study. They were divided into three groups: 50 intumescent white cataract patients (50 eyes) in the study group were performed femtosecond laser-assisted capsulotomy (LenSx system) operation selectively. Fifty intumescent white cataract patients (50 eyes) underwent normal manual continuous circular capsulorhexis as the control group 1. Fifty other types cataract patients (50 eyes) underwent femtosecond laser-assisted capsulotomy as the control group 2. To observe the complications such as radial tear in anterior capsule, posterior capsule rupture and vitreous prolapse occurred during operations in each group respectively. The microscopic images of the free anterior capsule after dyeing were observed in the studygroup and the control group 2. Using the German company Oculus Pentacam three-dimensional anterior eye segment system to collect the Scheimplug images of each group at 1, 3, 6 months and 1 year after operation. The data were analyzed by SPSS19.0 software package. Complications during operations in all groups were compared with Fisher exact test. The eccentricity and tilt of IOL in each group were analyzed by single factor analysis of variance. The SNK-q test was used to compare the different follow-up time groups. Results: One hundred and fifty patients aged from 50 to 86 years old, including 72 male cases and 78 female cases. In study group, radial tear in anterior capsule occurred in 2 eyes (4%), adherent tongue-like capsule adhesion was found in 6 eyes (12%), incomplete capsulotomy button happened in 2 eyes (4%), and posterior capsule rupture and vitreous prolapse occurred in 1 eye (2%). In the control group 1, radial tear in anterior capsule occurred in 8 eyes (16%) and posterior capsule rupture and vitreous prolapse occurred in 3 eyes (6%). The cases number of radial tear in anterior capsule and posterior capsule rupture and vitreous prolapse in the study group was obviously lower than the control group 1. The difference was statistically significant (P<0.05). In the control group 2, all 50 eyes were successfully completed. The implantation was uneventful and the IOL was centered. And posterior capsular rupture and vitreous prolapse did not occur. The difference was statistically significant between the study group and the control group 2 (P<0.05). After 1 year follow-up, the study group and the control group 2 showed no significant IOL tilt and eccentricity. The eccentricity and tilt of IOL in horizontal and vertical direction in control group 1 were significantly higher than those in the study group (F was 2.31, 1.10, 2.78 and 2.90 respectively) and control group 2 (F was 2.50, 2.32, 2.56 and 2.18respectively). The difference was statistically significant (P<0.05). Conclusions: Femtosecond laser-assisted anterior capsulotomy is accurate circle and center to avoid IOL eccentricity and tilt caused by capsular bag contraction asymmetrically after implantation, so as to ensure the long-term stability of the visual quality postoperatively. (Chin J Ophthalmol, 2017, 53: 281-287).
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Affiliation(s)
- T T Peng
- Wuhan Aier Eye Hospital, Wuhan 430063, China
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Ni HJ, Zhang YZ, Li J, Wang P, Chen L, Bao XY, Zhou YY, Feng ZM, Yin YL. Effect of replacing spray-dried plasma powder with yeast cell wall in creep feed on intestinal inflammatory status of piglets during the suckling and nursery periods1. J Anim Sci 2016. [DOI: 10.2527/jas.2015-9608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- H. J. Ni
- Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, South Central Experimental Station of Animal Nutrition and Feed Science in the Ministry of Agriculture, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Hunan, China
| | - Y. Z. Zhang
- Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, South Central Experimental Station of Animal Nutrition and Feed Science in the Ministry of Agriculture, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Hunan, China
- Hinapharm Pharmaceutical Co., Ltd, Foshan, Guangdong, China
| | - J. Li
- Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, South Central Experimental Station of Animal Nutrition and Feed Science in the Ministry of Agriculture, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Hunan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - P. Wang
- Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, South Central Experimental Station of Animal Nutrition and Feed Science in the Ministry of Agriculture, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Hunan, China
- Veterinary Faculty, Hunan Agricultural University, Changsha, Hunan, China
| | - L. Chen
- Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, South Central Experimental Station of Animal Nutrition and Feed Science in the Ministry of Agriculture, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Hunan, China
- College of Animal Science and Technology, Hunan Agricultural University, Changsha, Hunan, China
| | - X. Y. Bao
- Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, South Central Experimental Station of Animal Nutrition and Feed Science in the Ministry of Agriculture, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Hunan, China
- College of Animal Science and Technology, Hunan Agricultural University, Changsha, Hunan, China
| | - Y. Y Zhou
- Hinapharm Pharmaceutical Co., Ltd, Foshan, Guangdong, China
| | - Z. M. Feng
- Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, South Central Experimental Station of Animal Nutrition and Feed Science in the Ministry of Agriculture, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Hunan, China
- Hunan Co-Innovation Center of Animal Production Safety, Changsha, Hunan, China
| | - Y. L. Yin
- Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, South Central Experimental Station of Animal Nutrition and Feed Science in the Ministry of Agriculture, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Hunan, China
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Jiang LL, Wang SP, Meng FD, Duan JC, Niu HS, Xu GP, Zhu XX, Zhang ZH, Luo CY, Cui SJ, Li YM, Li XE, Wang Q, Zhou Y, Bao XY, Li YN, Dorji T, Piao SL, Ciais P, Peñuelas J, Du MY, Zhao XQ, Zhao L, Zhang FW, Wang GJ. Relatively stable response of fruiting stage to warming and cooling relative to other phenological events. Ecology 2016; 97:1961-1969. [DOI: 10.1002/ecy.1450] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 02/23/2016] [Accepted: 03/04/2016] [Indexed: 11/11/2022]
Affiliation(s)
- L. L. Jiang
- Key Laboratory of Alpine Ecology and Biodiversity; Institute of Tibetan Plateau Research; Chinese Academy of Sciences; Beijing 100101 China
- Naqu Integrated Observation and Research Station of Ecology and Environment; Tibet University and Institute of Tibetan Plateau Research of the Chinese Academy of Sciences; Lasa 850012 China
| | - S. P. Wang
- Key Laboratory of Alpine Ecology and Biodiversity; Institute of Tibetan Plateau Research; Chinese Academy of Sciences; Beijing 100101 China
- Naqu Integrated Observation and Research Station of Ecology and Environment; Tibet University and Institute of Tibetan Plateau Research of the Chinese Academy of Sciences; Lasa 850012 China
- CAS Center for Excellence in Tibetan Plateau Earth Science; Chinese Academy of Sciences; Beijing 100101 China
| | - F. D. Meng
- Key Laboratory of Alpine Ecology and Biodiversity; Institute of Tibetan Plateau Research; Chinese Academy of Sciences; Beijing 100101 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - J. C. Duan
- Binhai Research Institute in Tianjin; Tianjin 300457 China
| | - H. S. Niu
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - G. P. Xu
- Guangxi Institute of Botany; Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences; Guangxi 541006 China
| | - X. X. Zhu
- Naqu Integrated Observation and Research Station of Ecology and Environment; Tibet University and Institute of Tibetan Plateau Research of the Chinese Academy of Sciences; Lasa 850012 China
- Key Laboratory of Adaptation and Evolution of Plateau Biota; Northwest Institute of Plateau Biology; Chinese Academy of Sciences; Xining 810008 China
| | - Z. H. Zhang
- Key Laboratory of Adaptation and Evolution of Plateau Biota; Northwest Institute of Plateau Biology; Chinese Academy of Sciences; Xining 810008 China
| | - C. Y. Luo
- Key Laboratory of Adaptation and Evolution of Plateau Biota; Northwest Institute of Plateau Biology; Chinese Academy of Sciences; Xining 810008 China
| | - S. J. Cui
- Key Laboratory of Alpine Ecology and Biodiversity; Institute of Tibetan Plateau Research; Chinese Academy of Sciences; Beijing 100101 China
- Naqu Integrated Observation and Research Station of Ecology and Environment; Tibet University and Institute of Tibetan Plateau Research of the Chinese Academy of Sciences; Lasa 850012 China
| | - Y. M. Li
- Key Laboratory of Alpine Ecology and Biodiversity; Institute of Tibetan Plateau Research; Chinese Academy of Sciences; Beijing 100101 China
| | - X. E. Li
- Key Laboratory of Alpine Ecology and Biodiversity; Institute of Tibetan Plateau Research; Chinese Academy of Sciences; Beijing 100101 China
| | - Q. Wang
- Key Laboratory of Alpine Ecology and Biodiversity; Institute of Tibetan Plateau Research; Chinese Academy of Sciences; Beijing 100101 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Y. Zhou
- Key Laboratory of Alpine Ecology and Biodiversity; Institute of Tibetan Plateau Research; Chinese Academy of Sciences; Beijing 100101 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - X. Y. Bao
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Y. N. Li
- Key Laboratory of Adaptation and Evolution of Plateau Biota; Northwest Institute of Plateau Biology; Chinese Academy of Sciences; Xining 810008 China
| | - T. Dorji
- Key Laboratory of Alpine Ecology and Biodiversity; Institute of Tibetan Plateau Research; Chinese Academy of Sciences; Beijing 100101 China
- Naqu Integrated Observation and Research Station of Ecology and Environment; Tibet University and Institute of Tibetan Plateau Research of the Chinese Academy of Sciences; Lasa 850012 China
| | - S. L. Piao
- Key Laboratory of Alpine Ecology and Biodiversity; Institute of Tibetan Plateau Research; Chinese Academy of Sciences; Beijing 100101 China
| | - P. Ciais
- Laboratoire des Sciences du Climat et de l'Environnement; CEA CNRS UVSQ; 91191 Gif-sur-Yvette France
| | - J. Peñuelas
- CREAF; Cerdanyola del Valles Barcelona 08193 Catalonia, Spain
- CSIC; Global Ecology Unit CREAF-CEAB-CSIC-UAB; Cerdanyola del Vallès Barcelona 08193 Catalonia Spain
| | - M. Y. Du
- National Institute for Agro-Environment Sciences; Tsukuba 305-8604 Japan
| | - X. Q. Zhao
- Key Laboratory of Adaptation and Evolution of Plateau Biota; Northwest Institute of Plateau Biology; Chinese Academy of Sciences; Xining 810008 China
| | - L. Zhao
- Key Laboratory of Adaptation and Evolution of Plateau Biota; Northwest Institute of Plateau Biology; Chinese Academy of Sciences; Xining 810008 China
| | - F. W. Zhang
- Key Laboratory of Adaptation and Evolution of Plateau Biota; Northwest Institute of Plateau Biology; Chinese Academy of Sciences; Xining 810008 China
| | - G. J. Wang
- Oregon State University Agriculture and Natural Resource Program at Eastern Oregon University; La Grande Oregon 97850 USA
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Soci C, Zhang A, Xiang B, Dayeh SA, Aplin DPR, Park J, Bao XY, Lo YH, Wang D. ZnO nanowire UV photodetectors with high internal gain. Nano Lett 2007; 7:1003-9. [PMID: 17358092 DOI: 10.1021/nl070111x] [Citation(s) in RCA: 825] [Impact Index Per Article: 48.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
ZnO nanowire (NW) visible-blind UV photodetectors with internal photoconductive gain as high as G approximately 108 have been fabricated and characterized. The photoconduction mechanism in these devices has been elucidated by means of time-resolved measurements spanning a wide temporal domain, from 10-9 to 102 s, revealing the coexistence of fast (tau approximately 20 ns) and slow (tau approximately 10 s) components of the carrier relaxation dynamics. The extremely high photoconductive gain is attributed to the presence of oxygen-related hole-trap states at the NW surface, which prevents charge-carrier recombination and prolongs the photocarrier lifetime, as evidenced by the sensitivity of the photocurrrent to ambient conditions. Surprisingly, this mechanism appears to be effective even at the shortest time scale investigated of t < 1 ns. Despite the slow relaxation time, the extremely high internal gain of ZnO NW photodetectors results in gain-bandwidth products (GB) higher than approximately 10 GHz. The high gain and low power consumption of NW photodetectors promise a new generation of phototransistors for applications such as sensing, imaging, and intrachip optical interconnects.
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Affiliation(s)
- C Soci
- Department of Electrical and Computer Engineering, Jacobs School of Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0407, USA
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Bao XY, Setser DW. Temperature dependence of the electronic-to-vibrational quenching rate constants of nitrogen monofluoride (b1.SIGMA.+). ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100362a007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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