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Zhu D, Luan F, Lv X, Li J, Huang B. Correlation analysis of TGF-β1 gene polymorphism and expression with incidence and severity of lumbar disc herniation. Minerva Med 2023; 114:915-916. [PMID: 34542951 DOI: 10.23736/s0026-4806.21.07736-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dengsong Zhu
- Department of Spinal Surgery, Jinan Number Four Hospital, Jinan, China
| | - Fanghai Luan
- Department of Spinal Surgery, Jinan Number Four Hospital, Jinan, China
| | - Xiaoye Lv
- Department of Spinal Surgery, Jinan Number Four Hospital, Jinan, China
| | - Jing Li
- Department of Anesthesiology, Jinan Number Four Hospital, Jinan, China
| | - Bo Huang
- Department of Spinal Surgery, Jinan Number Four Hospital, Jinan, China -
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Li J, Luan F, Song J, Dong J, Shang M. Clinical Efficacy of Controlled-Release Morphine Tablets Combined with Celecoxib in Pain Management and the Effects on WNK1 Expression. Clinics (Sao Paulo) 2021; 76:e1907. [PMID: 33503173 PMCID: PMC7798123 DOI: 10.6061/clinics/2021/e1907] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 09/29/2020] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVES This study was designed to evaluate the clinical efficacy of controlled-release morphine tablets combined with celecoxib in relieving osteocarcinoma-related pain and the effects of the combination on WNK1 expression. METHODS A total of 110 patients with osteocarcinoma-related pain were selected and divided into two groups based on the treatment administered, including the control group (treated with controlled-release morphine tablets alone) and the study group (treated with a combination of controlled-release morphine tablets and celecoxib). We compared the treatment efficacy, pain level (visual analog scale (VAS)), time of onset of breakthrough pain (BTP), dose of morphine, incidence of adverse events, quality of life (QOL) score, and With-no-lysine 1 (WNK1) expression in the peripheral blood (PB) as determined with qRT-PCR before and after treatment, of the two groups. RESULTS The total effective rate of the study group was higher than that of the control group, while the VAS score, time of onset of BTP, dose of morphine, incidence of adverse events, QOL score, and relative WNK1 expression in the PB were lower than those of the control group (p<0.05). CONCLUSION Combination treatment with controlled-release morphine tablets and celecoxib can be extensively used in the clinical setting because it effectively improves the symptoms, QOL score, and adverse effects in patients with osteocarcinoma-related pain.
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Affiliation(s)
- Jian Li
- Department of Joint Surgery, the Fourth People's Hospital of Jinan, Jinan, China
| | - Fanghai Luan
- Department of Orthopedic Surgery, the Fourth People's Hospital of Jinan, Jinan, China
| | - Jiangfeng Song
- Department of Orthopedic, Ju County People's Hospital, Rizhao, China
| | - Jianhua Dong
- Department of Orthopedic, Ju County People's Hospital, Rizhao, China
| | - Mingfu Shang
- Department of Spinal Cord Repairing, 960 Hospital of the Joint Logistics Support Force of PLA, Jinan, China
- *Corresponding author. E-mail:
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Fu S, Yao Y, Lv F, Zhang F, Zhao Y, Luan F. Serum Homocysteine Levels Had Important Associations with Activity and Quality of Daily Living in Chinese Centenarians. J Nutr Health Aging 2019; 23:479-482. [PMID: 31021366 DOI: 10.1007/s12603-019-1189-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
BACKGROUND Population aging is an important problem worldwide, with activity and quality of daily living commonly reduced in elderly people. leading to increased hospitalization and mortality rates, and substantial individual and social burdens. OBJECTIVE This study was designed to investigate the associations of serum homocysteine levels with activity and quality of daily living in Chinese centenarians for the first time. PARTICIPANTS The China Hainan Centenarian Cohort Study was performed in 18 cities and counties of Hainan Province. MAIN MEASURES Home interview, physical examination and blood analysis were performed in 787 centenarians following standard procedures. KEY RESULTS The median age was 102 years, ranging between 100 and 115 years. There were 634 females (80.6%) and 153 males (19.4%) in all. The median level of serum homocysteine was 23.80 (18.80-29.90) umol/L, whereas median values of Barthel Index and EuroQol 5 Dimensions were 85(60-95) and 0.661(0.558-0.766), respectively. The centenarians with serum homocysteine levels ≥23.8μmol/L were more likely to had lower values of Barthel Index and EuroQol 5 Dimensions than those with serum homocysteine levels <23.8μmol/L (P<0.05 for all). In multivariate linear regression analyses, serum homocysteine levels were significantly associated with Barthel Index and EuroQol 5 Dimensions (P<0.05 for all). CONCLUSIONS Serum homocysteine levels had important associations with activity and quality of daily living in Chinese centenarians. Future research should focus on the value of intervening in serum homocysteine levels by supplying folic acid (vitamin B9) and vitamin B12 on improving activity and quality of daily living in elderly people.
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Affiliation(s)
- S Fu
- Yali Zhao, Central Laboratory, Hainan Branch of Chinese People's Liberation Army General Hospital, Sanya 572013, China
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Yao Y, Fu S, Li N, Hu F, Zhang H, Zhu Q, Luan F, Zhang F, Zhao Y, He Y. Sex, Residence and Fish Intake Predict Vitamin D Status in Chinese Centenarians. J Nutr Health Aging 2019; 23:165-171. [PMID: 30697626 DOI: 10.1007/s12603-018-1126-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVES This study aims to investigate the prevalence of vitamin D deficiency in Chinese centenarians and to identify the factors associated with vitamin D deficiency. DESIGN Cross-sectional population-based study. SETTING Hainan province in the south of China. PARTICIPANTS 943 subjects aged 100 years old and older. METHODS Details on sociodemographics and lifestyle characteristics were collected using a structured questionnaire. Anthropometrics and blood samples were obtained. Vitamin D deficiency was defined as serum 25-hydroxyvitamin D concentration < 20ng/mL (50nmol/L). RESULTS The overall prevalence of vitamin D deficiency among these 943 centenarians was 39.9% (376 subjects) and the mean serum vitamin D concentrations were 22.7±9.5 (ng/mL). Female centenarians had higher prevalence of vitamin D deficiency than male (44.0% vs. 21.7%, P <0.001). Multivariate logistic regression analyses showed that being female, urban residency, lower body mass index, higher serum parathyroid hormone levels, no fish consumption, and less sun exposure time were all significant and independent determinants of vitamin D deficiency. No significant associations of vitamin D deficiency with ethnic, education, geographic location, tea drinking, alcohol use, or smoking were found in this study. CONCLUSION Vitamin D deficiency was common in Chinese centenarians, especially in women. Given that vitamin D deficiency is linked to numerous adverse health outcomes, dietary, outdoor activities and other intervention measures are needed to correct vitamin D deficiency in this population.
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Affiliation(s)
- Y Yao
- Yali Zhao, Central Laboratory, Hainan Branch of Chinese PLA General Hospital, Sanya, China,
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Abstract
BACKGROUND Activity of daily living declines in female elderly, which not only increases hospitalization and mortality rates, but also aggravates individual and societal burden. Large samples are needed to elucidate the relationships of plasma sex hormone levels with activity of daily living in Chinese female centenarians to better understand the effects of hormone-replacing therapy. OBJECTIVE As the first time in the world, the current study was designed to investigate the relationships of plasma sex hormone levels with activity of daily living in Chinese female centenarians. PARTICIPANTS China Hainan Centenarian Cohort Study was carried out in 18 cities and counties of Hainan Province. MAIN MEASURES Home interview, physical examination and blood analysis were carried out in 583 female centenarians following standard procedures. Barthel Index was used to assess the activity of daily living. KEY RESULTS Median age of all female centenarians was 102 years, with the range from 100 to 115 years. Median values of Barthel Index were 85(60-90). In multivariate linear regression analyses, Barthel Index values were inversely associated with plasma luteinizing hormone (LH), follicle-simulating hormone (FSH), testosterone, progesterone and estradiol levels (P<0.05 for all). CONCLUSION Plasma sex hormone levels, including LH, FSH, testosterone, progesterone and estradiol, had significant relationships with activity of daily living in Chinese female centenarians.
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Affiliation(s)
- S Fu
- Yali Zhao, Central Laboratory, Hainan Branch of Chinese People's Liberation Army General Hospital, Sanya, China. E-mail:
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Cui H, Wu C, Zhu Q, Fan C, Gao P, Luan F. First Report of Powdery Mildew Caused by Podosphaera xanthii on Lagenaria siceraria in China. Plant Dis 2018; 102:PDIS12171993PDN. [PMID: 30192178 DOI: 10.1094/pdis-12-17-1993-pdn] [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] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Affiliation(s)
- H Cui
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, China, and Key Laboratory of Biology and Genetic Improvement of Horticulture Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, China
| | - C Wu
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, China, and Key Laboratory of Biology and Genetic Improvement of Horticulture Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, China
| | - Q Zhu
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, China, and Key Laboratory of Biology and Genetic Improvement of Horticulture Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, China
| | - C Fan
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, China, Key Laboratory of Biology and Genetic Improvement of Horticulture Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, China, and Hainan Base of Heilongjiang Agriculture Academy, Sanya, Hainan, 572000, China
| | - P Gao
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, China, and Key Laboratory of Biology and Genetic Improvement of Horticulture Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, China
| | - F Luan
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, Heilongjiang 150030, China, and Key Laboratory of Biology and Genetic Improvement of Horticulture Crops (Northeast Region), Ministry of Agriculture, Harbin, Heilongjiang 150030, China
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Zhang H, Luan F. Overexpression of the CmACS-3 gene in melon causes abnormal pollen development. Genet Mol Res 2015; 14:10433-43. [PMID: 26400274 DOI: 10.4238/2015.september.8.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Sexual diversity expressed by the Curcurbitaceae family is a primary example of developmental plasticity in plants. Most melon genotypes are andromonoecious, where an initial phase of male flowers is followed by a mixture of bisexual and male flowers. Over-expression of the CmACS-3 gene in melon plants showed an increased number of flower buds, and increased femaleness as demonstrated by a larger number bisexual buds. Transformation of CmACS-3 in melons showed earlier development of and an increased number of bisexual buds that matured to anthesis but also increased the rate of development of the bisexual buds to maturity. Field studies showed that CmACS-3-overexpressing melons had earlier mature bisexual flowers, earlier fruit set, and an increased number of fruits set on closely spaced nodes on the main stem.
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Affiliation(s)
- H Zhang
- Anhui Key Laboratory of Plant Resources and Biology, School of Life Science, Huaibei Normal University, Huaibei, Anhui, China
| | - F Luan
- College of Horticulture, Northeast Agricultural University, Harbin, China
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Hu DJJ, Murray RT, Legg T, Runcorn TH, Zhang M, Woodward RI, Lim JL, Wang Y, Luan F, Gu B, Shum PP, Kelleher EJR, Popov SV, Taylor JR. Fiber-integrated 780 nm source for visible parametric generation. Opt Express 2014; 22:29726-29732. [PMID: 25606903 DOI: 10.1364/oe.22.029726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the development of a fully fiber-integrated pulsed master oscillator power fibre amplifier (MOPFA) source at 780 nm, producing 3.5 W of average power with 410 ps pulses at a repetition rate of 50 MHz. The source consists of an intensity modulated 1560 nm laser diode amplified in an erbium fiber amplifier chain, followed by a fiber coupled periodically poled lithium niobate crystal module for frequency doubling. The source is then used for generating visible light through four-wave mixing in a length of highly nonlinear photonic crystal fiber: 105 mW at 668 nm and 95 mW at 662 nm are obtained, with pump to anti-Stokes conversion slope efficiencies exceeding 6% in both cases.
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Zuo J, Han J, Qiu S, Luan F, Zhu X, Gao H, Chen A. Neural reflex pathway between cervical spinal and sympathetic ganglia in rabbits: implication for pathogenesis of cervical vertigo. Spine J 2014; 14:1005-9. [PMID: 24291360 DOI: 10.1016/j.spinee.2013.11.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 09/25/2013] [Accepted: 11/21/2013] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT A functional association between cervix and vertigo has been observed in patients with cervical vertigo, implicating correlation between cervical spinal and sympathetic ganglia. However, it is unclear where there is an anatomic connection between those two groups of ganglia. PURPOSE This study aimed to investigate the existence of the neural connections between cervical spinal and sympathetic ganglia. STUDY DESIGN/SETTING FluoroGold staining patterns in cervical spinal and sympathetic ganglia were evaluated using FluoroGold retrograde tracing in New Zealand rabbits. METHODS New Zealand rabbits were randomly divided into superior cervical spinal ganglion injection groups, inferior cervical spinal ganglion injection groups, superior cervical sympathetic ganglion injection group, and inferior cervical sympathetic ganglion injection group. Four percent FluoroGold solution was injected into these ganglia. Distribution of FluoroGold in cervical spinal and sympathetic ganglia was observed under a microscope. RESULTS When FluoroGold solution was injected into C2 and C3 superior cervical spinal ganglia or C5-C6 inferior cervical spinal ganglia, fluorescence was only observed in the ipsilateral superior or inferior cervical sympathetic ganglia, respectively. When FluoroGold solution was injected into superior or inferior cervical sympathetic ganglia, fluorescence was found mainly in the ipsilateral C3-C4 superior or C5-C8 inferior spinal ganglia. No fluorescence was observed in contralateral ganglia of experimental animals and all ganglia of matched control animals injected with physiological saline. CONCLUSIONS Bidirectional nerve fiber connections between cervical spinal and sympathetic ganglia were observed, and these connections are arranged in a segmental distribution. This observation may provide a possible neuroanatomic basis for the pathogenesis of cervical vertigo.
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Affiliation(s)
- Jinliang Zuo
- Department of Orthopedics, The 4th Hospital of Jinan, 50 Shifan Rd, Jinan, Shandong Province 250031, China.
| | - Jianlong Han
- Department of Orthopedics, The 4th Hospital of Jinan, 50 Shifan Rd, Jinan, Shandong Province 250031, China
| | - Siqiang Qiu
- Department of Orthopedics, The 4th Hospital of Jinan, 50 Shifan Rd, Jinan, Shandong Province 250031, China
| | - Fanghai Luan
- Department of Orthopedics, The 4th Hospital of Jinan, 50 Shifan Rd, Jinan, Shandong Province 250031, China
| | - Xinwei Zhu
- Department of Orthopedics, The 4th Hospital of Jinan, 50 Shifan Rd, Jinan, Shandong Province 250031, China
| | - Haoyuan Gao
- Department of Orthopedics, The 4th Hospital of Jinan, 50 Shifan Rd, Jinan, Shandong Province 250031, China
| | - Anmin Chen
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095 Jiefang Ave, Wuhan, Hubei Province 430030, China
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Xu LN, Gai FY, Mu GF, Gao Y, Liu HT, Luan F. Determination of formaldehyde in aquatic products by micellar electrokinetic capillary chromatography with 2,4-dinitrophenylhydrazine derivatization. ACTA CHROMATOGR 2012. [DOI: 10.1556/achrom.24.2012.4.1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Speck-Planche A, Luan F, Cordeiro MNDS. Role of ligand-based drug design methodologies toward the discovery of new anti- Alzheimer agents: futures perspectives in Fragment-Based Ligand Design. Curr Med Chem 2012; 19:1635-45. [PMID: 22376033 DOI: 10.2174/092986712799945058] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Revised: 01/23/2012] [Accepted: 01/23/2012] [Indexed: 11/22/2022]
Abstract
Alzheimer's disease (AD), a degenerative disease affecting the brain, is the single most common source of dementia in adults. The cause and the progression of AD still remains a mystery among medical experts. As a result, a cure has not yet been discovered, even after decade's worth of research that started since 1906, when the disease was first identified. Despite the efforts of the scientific community, several of the biological receptors associated with AD have not been sufficiently studied to date, limiting in turn the design of new and more potent anti-AD agents. Thus, the search for new drug candidates as inhibitors of different targets associated with AD constitutes an essential part towards the discovery of new and more efficient anti-AD therapies. The present work is focused on the role of the Ligand-Based Drug Design (LBDD) methodologies which have been applied for the elucidation of new molecular entities with high inhibitory activity against targets related with AD. Particular emphasis is given also to the current state of fragment-based ligand approaches as alternatives of the Fragment-Based Drug Discovery (FBDD) methodologies. Finally, several guidelines are offered to show how the use of fragment-based descriptors can be determinant for the design of multi-target inhibitors of proteins associated with AD.
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Affiliation(s)
- A Speck-Planche
- REQUIMTE/Department of Chemistry and Biochemistry, University of Porto, Porto, Portugal.
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Luan F, Xu X, Liu H, Cordeiro M, Zhang X. QSAR Studies of PTP1B Inhibitors: Recent Advances and Perspectives. Curr Med Chem 2012; 19:4208-17. [DOI: 10.2174/092986712802884196] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Revised: 04/27/2012] [Accepted: 07/13/2012] [Indexed: 11/22/2022]
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Speck-Planche A, Luan F, N.D.S. Cordeiro M. Discovery of Anti-Alzheimer Agents: Current Ligand-Based Approaches toward the Design of Acetylcholinesterase Inhibitors. Mini Rev Med Chem 2012; 12:583-91. [DOI: 10.2174/138955712800493744] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2011] [Revised: 12/14/2011] [Accepted: 12/22/2011] [Indexed: 11/22/2022]
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Pelusi MD, Luan F, Choi DY, Madden SJ, Bulla DAP, Luther-Davies B, Eggleton BJ. Optical phase conjugation by an As(2)S(3) glass planar waveguide for dispersion-free transmission of WDM-DPSK signals over fiber. Opt Express 2010; 18:26686-26694. [PMID: 21165019 DOI: 10.1364/oe.18.026686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We report the first demonstration of optical phase conjugation (OPC) transmission of phase encoded and wavelength-division multiplexed (WDM) signals by the Kerr effect in a planar structured waveguide. The phase conjugated electric field of the signal is produced by four wave mixing pumped by a CW laser during co-propagating with the signal in a highly nonlinear waveguide fabricated in As(2)S(3) glass. Experiments demonstrate the capability of the device to perform dispersion-free transmission through up to 225 km of standard single mode fiber for a 3 × 40 Gb/s WDM signal, with its channels encoded as return-to-zero differential phase shift keying and spaced either 100 or 200 GHz apart. This work represents an important milestone towards demonstrating advanced signal processing of high-speed and broadband optical signals in compact planar waveguides, with the potential for monolithic optical integration.
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Affiliation(s)
- M D Pelusi
- ARC Centre for Ultrahigh bandwidth Devices for Optical Systems, IPOS, School of Physics, University of Sydney, New South Wales 2006, Australia.
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Wen Y, Liu H, Tian L, Han P, Luan F. Analysis of alkaloids in pharmaceutical preparations containing Kushen by capillary electrophoresis with application of experimental design and a quantitative structure-property relationship approach. ACTA CHROMATOGR 2010. [DOI: 10.1556/achrom.22.2010.3.8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Vo TD, Pelusi MD, Schröder J, Luan F, Madden SJ, Choi DY, Bulla DAP, Luther-Davies B, Eggleton BJ. Simultaneous multi-impairment monitoring of 640 Gb/s signals using photonic chip based RF spectrum analyzer. Opt Express 2010; 18:3938-3945. [PMID: 20389406 DOI: 10.1364/oe.18.003938] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We report the first demonstration of simultaneous multi-impairment monitoring at ultrahigh bitrates using a THz bandwidth photonic-chip-based radio-frequency (RF) spectrum analyzer. Our approach employs a 7 cm long, highly nonlinear (gamma approximately 9900 /W/km), dispersion engineered chalcogenide planar waveguide to capture the RF spectrum of an ultrafast 640 Gb/s signal, based on cross-phase modulation, from which we numerically retrieve the autocorrelation waveform. The relationship between the retrieved autocorrelation trace and signal impairments is exploited to simultaneously monitor dispersion, in-band optical signal to noise ratio (OSNR) and timing jitter from a single measurement. This novel approach also offers very high OSNR measurement dynamic range (> 30 dB) and is scalable to terabit data rates.
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Affiliation(s)
- T D Vo
- ARC Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Institute of Photonics and Optical Science (IPOS), School of Physics, University of Sydney, New South Wales 2006, Australia
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Luan F, Liu H, Gao L, Liu J, Sun Z, Ju Y, Hou N, Guo C, Liang X, Zhang L, Sun W, Ma C. Hepatitis B virus protein preS2 potentially promotes HCC development via its transcriptional activation of hTERT. Gut 2009; 58:1528-37. [PMID: 19651630 DOI: 10.1136/gut.2008.174029] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUNDS AND AIMS Telomerase is significantly reactivated in hepatitis B virus (HBV)-associated hepatocellular carcinoma (HCC). Our previous studies showed that the transactivation unit of HBV surface (S) gene, preS2, could upregulate human telomerase reverse transcriptase (hTERT) expression and telomerase activity of HepG2 cells. Here, we aim to explore the functions, and the underlying mechanisms, of this preS2-mediated hTERT upregulation during HCC development. METHODS An antisense blocking assay was performed on HBV-integrated HepG2.2.15 cells. The expression of hTERT was examined in clinical samples to test the role of the preS2-mediated hTERT upregulation in HCC development in vivo. In order to explore the mechanisms of preS2-mediated hTERT upregulation, co-transfection, reporter assays and electrophoretic mobility shift assays (EMSA) were performed. RESULTS Blocking preS2 expression reduced hTERT expression, telomerase activity, cell proliferation and tumorigenicity of HepG2.2.15. A region located between -349 and -329 bp upstream of the transcription initiation site of hTERT was identified as responsible for the preS2-mediated effect. preS2 interacted with the preS2-responsible region (PRR) and activated the hTERT promoter. Importantly, hTERT was also highly expressed in preS2-positive human HCC samples. All these findings strongly suggest that preS2 may promote HCC development via hTERT activation. CONCLUSIONS HBV protein preS2 upregulates hTERT via the PRR element in promoting HCC development.
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Affiliation(s)
- F Luan
- Institute of Immunology/Key Laboratory for Experimental Teratology of Chinese Ministry of Education, Shandong University School of Medicine, Shandong, 250012 PR China
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Xiong C, Magi E, Luan F, Tuniz A, Dekker S, Sanghera JS, Shaw LB, Aggarwal ID, Eggleton BJ. Characterization of picosecond pulse nonlinear propagation in chalcogenide As(2)S(3) fiber. Appl Opt 2009; 48:5467-5474. [PMID: 19823228 DOI: 10.1364/ao.48.005467] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We characterize the nonlinear propagation of picosecond pulses in chalcogenide As(2)S(3) single-mode fiber using a pump-probe technique. The cross-phase modulation (XPM)-induced sideband broadening and stimulated Raman scattering (SRS)-induced sideband amplification are measured in order to map out the Raman gain spectrum of this glass across the C-band. We extract the Raman response function from the Raman gain spectrum and determine the power and polarization dependence of the SRS. In contrast to previous work using As(2)Se(3) fiber, we find that the As(2)S(3) fiber does not suffer from large two-photon absorption (TPA) in the wavelength range of the telecommunications band. We achieved a 20 dB peak Raman gain at a Stokes shift of 350 cm(-1) in a 205 mm length of As(2)S(3) single-mode fiber. The Raman gain coefficient is estimated to be 4.3x10(-12) m/W and the threshold pump peak power is estimated to be 16.2 W for the 205 mm As(2)S(3) fiber. We also demonstrate that we can infer the dispersion of the As(2)S(3) fiber and justify the Raman response function by comparing simulation and experimental results.
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Affiliation(s)
- C Xiong
- Centre for Ultrahigh-Bandwidth Devices for Optical Systems (CUDOS), Institute for Photonicsand Optical Science (IPOS), School of Physics, University of Sydney, NSW 2006, Australia.
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Pelusi MD, Vo TD, Luan F, Madden SJ, Choi DY, Bulla DAP, Luther-Davies B, Eggleton BJ. Terahertz bandwidth RF spectrum analysis of femtosecond pulses using a chalcogenide chip. Opt Express 2009; 17:9314-9322. [PMID: 19466183 DOI: 10.1364/oe.17.009314] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report the first demonstration of the use of an RF spectrum analyser with multi-terahertz bandwidth to measure the properties of femtosecond optical pulses. A low distortion and broad measurement bandwidth of 2.78 THz (nearly two orders of magnitude greater than conventional opto-electronic analyzers) was achieved by using a 6 cm long As(2)S(3) chalcogenide waveguide designed for high Kerr nonlinearity and near zero dispersion. Measurements of pulses as short as 260 fs produced from a soliton-effect compressor reveal features not evident from the pulse's optical spectrum. We also applied an inverse Fourier transform numerically to the captured data to re-construct a time-domain waveform that resembled pulse measurement obtained from intensity autocorrelation.
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Affiliation(s)
- M D Pelusi
- ARC Centre for Ultrahigh bandwidth Devices for Optical Systems, Institute of Photonics and Optical Science, School of Physics, University of Sydney, New South Wales 2006, Australia.
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20
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Luan F, Liu H, Gao Y, Zhang X. QSPR model to predict the thermal stabilities of second-order nonlinear optical (NLO) chromophore molecules. Molecular Simulation 2009. [DOI: 10.1080/08927020802378928] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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21
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Luan F, Liu HT, Ma WP, Fan BT. QSPR analysis of air-to-blood distribution of volatile organic compounds. Ecotoxicol Environ Saf 2008; 71:731-739. [PMID: 18067958 DOI: 10.1016/j.ecoenv.2007.10.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2007] [Revised: 10/11/2007] [Accepted: 10/21/2007] [Indexed: 05/25/2023]
Abstract
Quantitative structure property relationship (QSPR) models for the prediction of human blood:air partition coefficient (log K(blood)) of volatile organic compounds (VOCs) has been developed based on the linear heuristic method (HM) and non-linear radial basis function neural networks (RBFNNs). Molecular descriptors that are calculated from the structures alone were used to represent the characteristics of the compounds. HM was used both to pre-select the whole descriptor sets and to build the linear model. RBFNN was performed to obtain more accurate models. Both the linear and the non-linear models can give very satisfactory prediction results: the correlation coefficient R was 0.964 and 0.979, and the root-mean-square (RMS) error was 0.3303 and 0.2542 for the whole data set, respectively. The prediction result of the non-linear model is better than that obtained by the linear model. In addition, this paper provides an effective method for predicting log K(blood) from its structures and gives some insight into the structural features related to the solubility of VOCs in human blood.
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Affiliation(s)
- F Luan
- Department of Applied Chemistry, Yantai University, Yantai 264005, PR China.
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22
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Pelusi MD, Luan F, Magi E, Lamont MR, Moss DJ, Eggleton BJ, Sanghera JS, Shaw LB, Aggarwal ID. High bit rate all-optical signal processing in a fiber photonic wire. Opt Express 2008; 16:11506-11512. [PMID: 18648471 DOI: 10.1364/oe.16.011506] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2008] [Accepted: 07/16/2008] [Indexed: 05/26/2023]
Abstract
We report the first demonstration of high bit rate signal processing by a fiber-based photonic wire. We achieve 160 Gb/s demultiplexing via four wave mixing in a 1.9 microm diameter photonic wire tapered from As(2)S(3) chalcogenide glass single mode fibre, with very low pump power requirements ( < 20 mW average power, 0.45 W peak power), enabled by a very high nonlinearity (gamma approximately 7850 W(-1) km (-1) ) and greatly reduced dispersion.
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Affiliation(s)
- M D Pelusi
- Centre for Ultrahigh Bandwidth Devices for Optical Systems, School of Physics, University of Sydney, New South Wales, Australia
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23
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Luan F, Liu HT, Wen YY, Zhang XY. Classification of the fragrance properties of chemical compounds based on support vector machine and linear discriminant analysis. FLAVOUR FRAG J 2008. [DOI: 10.1002/ffj.1876] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Lü W, Chen Y, Ma W, Zhang X, Luan F, Liu M, Chen X, Hu Z. QSAR study of neuraminidase inhibitors based on heuristic method and radial basis function network. Eur J Med Chem 2008; 43:569-76. [DOI: 10.1016/j.ejmech.2007.04.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2007] [Revised: 03/28/2007] [Accepted: 04/19/2007] [Indexed: 11/29/2022]
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Abstract
The zinc-fingers and homeoboxes 2 (ZHX2) protein was shown previously to be involved in postnatal repression of α-fetoprotein (AFP) in mice. More recently, loss of ZHX2 expression was often found in human hepatcellular carcinoma (HCC), where AFP is frequently reactivated. Using HepG2 and HepG2.2.15, which express high AFP levels, we show that ZHX2 overexpression significantly decreases of AFP secretion in a dose dependent manner. Furthermore, using LO2 and SMMC7721 cells, which express low AFP levels, we use siRNA inhibition to show that AFP is de-repressed when ZHX2 levels are reduced. This represents the first direct evidence that ZHX2 represses AFP. Co-transfections of ZHX2 and AFP-luciferase reporter genes demonstrate ZHX2 repression is governed by the AFP promoter and requires intact HNF1 binding sites. These data support the idea that ZHX2 contributes to AFP repression in the liver after birth and may also be involved in AFP reactivation in liver cancer.
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Affiliation(s)
- H Shen
- Institute of Immunology, School of Medicine, Shandong University, Wenhua Xi Road, Jinan, PR China
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26
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Luan F, Liu HT, Ma WP, Fan BT. Classification of estrogen receptor-β ligands on the basis of their binding affinities using support vector machine and linear discriminant analysis. Eur J Med Chem 2008; 43:43-52. [PMID: 17459530 DOI: 10.1016/j.ejmech.2007.03.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2006] [Revised: 03/03/2007] [Accepted: 03/06/2007] [Indexed: 01/22/2023]
Abstract
Classification models of estrogen receptor-beta ligands were proposed using linear and nonlinear models. The data set was divided into active and inactive classes on the basis of their binding affinities. The two-class problem (active, inactive) was firstly explored by linear classifier approach, linear discriminant analysis (LDA). In order to get a more accurate prediction model, the nonlinear novel machine learning technique, support vectors machine (SVM), was subsequently used to investigate. The heuristic method (HM) was used to pre-select the whole descriptor sets. The model containing eight descriptors founded by SVM, showed better predictive ability than LDA. The accuracy in prediction for the training, test and overall data sets are 92.9%, 85.8% and 91.4% for SVM, 83.1%, 76.1% and 81.9% for LDA, respectively. The results indicate that SVM can be used as a powerful modeling tool for QSAR studies.
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Affiliation(s)
- F Luan
- Department of Applied Chemistry, Yantai University, Yantai, Shandong 264005, PR China.
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27
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Luan F, Si HZ, Liu HT, Wen YY, Zhang XY. Prediction of atmospheric degradation data for POPs by gene expression programming. SAR QSAR Environ Res 2008; 19:465-479. [PMID: 18853297 DOI: 10.1080/10629360802348845] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Quantitative structure-activity relationship models for the prediction of the mean and the maximum atmospheric degradation half-life values of persistent organic pollutants were developed based on the linear heuristic method (HM) and non-linear gene expression programming (GEP). Molecular descriptors, calculated from the structures alone, were used to represent the characteristics of the compounds. HM was used both to pre-select the whole descriptor sets and to build the linear model. GEP yielded satisfactory prediction results: the square of the correlation coefficient r(2) was 0.80 and 0.81 for the mean and maximum half-life values of the test set, and the root mean square errors were 0.448 and 0.426, respectively. The results of this work indicate that the GEP is a very promising tool for non-linear approximations.
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Affiliation(s)
- F Luan
- Department of Applied Chemistry, Yantai University, Yantai, Shandong, P.R. China.
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Bolger JA, Luan F, Yeom DI, Tsoy EN, de Sterke CM, Eggleton BJ. Tunable enhancement of a soliton spectrum using an acoustic long-period grating. Opt Express 2007; 15:13457-13462. [PMID: 19550615 DOI: 10.1364/oe.15.013457] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We demonstrate a scheme for tunable shaping of a soliton spectrum. Specifically, we show a local enhancement of 6 dB in the pulse spectrum by propagating the pulse through a fiber containing micro-bends generated by a flexural acoustic wave - an acoustic long-period grating (LPG) - followed by nonlinear propagation through uniform fiber. The location of the enhancement peak can be tuned by external control of the acoustic frequency of the LPG. We discuss the potential application of this scheme to tunable supercontinuum sources.
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Wolchover NA, Luan F, George AK, Knight JC, Omenetto FG. High nonlinearity glass photonic crystal nanowires. Opt Express 2007; 15:829-833. [PMID: 19532307 DOI: 10.1364/oe.15.000829] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Soft glass photonic crystal fibers (PCFs) have been fabricated for the first time with the stack and draw process. The same SF6-PCFs have been successfully tapered using a brush flame method. The transverse structure of the PCF does not collapse in the tapering process and core dimensions of the fabricated photonic nanowire has been measured to be 400 nm in diameter. Supercontinuum radiation in excess of one octave has been generated in both the untapered and tapered PCF and, in the latter case, pulse energy thresholds of 65 picojoules at a pump wavelength of 1550 nm were observed.
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Wang A, Pearce GJ, Luan F, Bird DM, Birks TA, Knight JC. All solid photonic bandgap fiber based on an array of oriented rectangular high index rods. Opt Express 2006; 14:10844-10850. [PMID: 19529497 DOI: 10.1364/oe.14.010844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report the fabrication, characterization and modeling of an all-solid photonic bandgap fiber (PBGF) based on an array of oriented rectangular rods. Observed near-field patterns of cladding modes clearly identify the cut-off rod modes at the bandgap edges. The bend losses in this fiber depend on the bend direction, and can be understood by the directional coupling properties of the different rod modes and the modeled density of cladding states.
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Luan F, Skryabin DV, Yulin AV, Knight JC. Energy exchange between colliding solitons in photonic crystal fibers. Opt Express 2006; 14:9844-9853. [PMID: 19529377 DOI: 10.1364/oe.14.009844] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Collisions of femtosecond solitons in silica core photonic crystal fibers are investigated experimentally and theoretically. Clear spectral signatures of the significant energy exchange between the interacting pulses are reported. Two primary and competing effects causing energy exchange are interpulse Raman scattering, which is insensitive to the phase difference of the colliding solitons, and the phase sensitive interaction via the Kerr nonlinearity.
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Luan F, Yulin A, Knight JC, Skryabin DV. Polarization instability of solitons in photonic crystal fibers. Opt Express 2006; 14:6550-6556. [PMID: 19516832 DOI: 10.1364/oe.14.006550] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We present experimental and numerical results demonstrating the existence of polarization instability of femtosecond solitons in small core photonic crystal fibers. The frequency of the solitons in our setup shifts rapidly with propagation along the dispersion curve due to the Raman effect. This process can cause initially stable solitons to become unstable, or vice versa depending on the parameters.
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Stone JM, Pearce GJ, Luan F, Birks TA, Knight JC, George AK, Bird DM. An improved photonic bandgap fiber based on an array of rings. Opt Express 2006; 14:6291-6296. [PMID: 19516803 DOI: 10.1364/oe.14.006291] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We describe the modeling, fabrication and characterization of a silica-core photonic bandgap fiber based on a 2-d array of raised-index cladding rings. The use of rings to form the cladding is shown to re-order the cladding modes in such a way as to broaden the photonic band gaps and reduce bend sensitivity. We compare the performance of the ring fiber with that of a similar fiber made using solid rods.
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Abstract
Experimental measurements of all-solid photonic bandgap fibres with an array of high-index rods in a low-index background revealed an unexpected variation of bend loss across different bandgaps. This behaviour was confirmed by calculations of photonic band structure, and explained with reference to the differing field distributions of the modes of the cladding rods. Our understanding was confirmed by further experiments, leading to proposals for the improvement of these fibres.
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Abstract
We present a hybrid photonic crystal fiber in which a guided mode is confined simultaneously by modified total internal reflection from an array of air holes and antiresonant reflection from a line of high-index inclusions. Experimental results demonstrate that this fiber shares properties of both index-guided and photonic bandgap structures.
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36
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Luan F, Ma W, Zhang X, Zhang H, Liu M, Hu Z, Fan B. QSAR Study of Polychlorinated Dibenzodioxins, Dibenzofurans, and Biphenyls using the Heuristic Method and Support Vector Machine. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/qsar.200530131] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Argyros A, Birks T, Leon-Saval S, Cordeiro CM, Luan F, Russell PSJ. Photonic bandgap with an index step of one percent. Opt Express 2005; 13:309-314. [PMID: 19488355 DOI: 10.1364/opex.13.000309] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Early work suggested that very large refractive index contrasts would be needed to create photonic bandgaps in two or three dimensionally periodic photonic crystals. It was then shown that in two-dimensionally periodic structures (such as photonic crystal fibres) a non-zero wavevector component in the axial direction permits photonic bandgaps for much smaller index contrasts. Here we experimentally demonstrate a photonic bandgap fibre made from two glasses with a relative index step of only 1%.
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Abstract
We describe the design and fabrication of a photonic bandgap fiber formed with two different glasses. As in a hollow-core fiber, light is guided in a low-index core region because of the antiresonances of the high-index strands in the fiber cladding. The structure described represents an ideal bandgap fiber that exhibits no interface modes and guides over the full width of multiple bandgaps.
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Affiliation(s)
- F Luan
- Department of Physics, University of Bath, Bath BA2 7AY, UK.
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Luan F, Knight J, Russell P, Campbell S, Xiao D, Reid D, Mangan B, Williams D, Roberts P. Femtosecond soliton pulse delivery at 800nm wavelength in hollow-core photonic bandgap fibers. Opt Express 2004; 12:835-840. [PMID: 19474893 DOI: 10.1364/opex.12.000835] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We describe delivery of femtosecond solitons at 800nm wavelength over five meters of hollow-core photonic bandgap fiber. The output pulses had a length of less than 300fs and an output pulse energy of around 65nJ, and were almost bandwidth limited. Numerical modeling shows that the nonlinear phase shift is determined by both the nonlinearity of air and by the overlap of the guided mode with the glass.
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Abstract
We report the cancellation of the soliton self-frequency shift in a silica-core photonic crystal fiber with a negative dispersion slope. Numerical and experimental results show that stabilization of the soliton wavelength is accompanied by exponential amplification of the red-shifted Cherenkov radiation emitted by the soliton. The spectral recoil from the radiation acts on the soliton to compensate for the Raman frequency shift. This phenomenon may find applications in the development of a family of optical parametric amplifiers.
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Affiliation(s)
- D V Skryabin
- Department of Physics, University of Bath, Bath BA2 7AY, UK.
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Bouwmans G, Luan F, Knight J, St J Russell P, Farr L, Mangan B, Sabert H. Properties of a hollow-core photonic bandgap fiber at 850 nm wavelength. Opt Express 2003; 11:1613-1620. [PMID: 19466039 DOI: 10.1364/oe.11.001613] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We describe a hollow-core photonic bandgap fiber designed for use in the 850 nm wavelength region. The fiber has a minimum attenuation of 180dB/km at 847nm wavelength. The low-loss mode has a quasi- Gaussian intensity profile. The group-velocity dispersion of this mode passes through zero around 830nm, and is anomalous for longer wavelengths. The polarization beat length varies from 4 mm to 13 mm across the band gap. We expect this fiber to be useful for delivery of high-energy ultrashort optical pulses.
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Abstract
The Support Vector Machine (SVM) classification algorithm, recently developed from the machine learning community, was used to diagnose breast cancer. At the same time, the SVM was compared to several machine learning techniques currently used in this field. The classification task involves predicting the state of diseases, using data obtained from the UCI machine learning repository. SVM outperformed k-means cluster and two artificial neural networks on the whole. It can be concluded that nine samples could be mislabeled from the comparison of several machine learning techniques.
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Affiliation(s)
- H X Liu
- Department of Chemistry, Lanzhou University, Lanzhou 730000, China
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Abstract
OBJECTIVE To analyze neck kinematics and loading patterns during rear-end impacts. DESIGN The motion of each cervical vertebra was captured using a 250 frame/s X-ray system during a whole body rear-end impact. These data were analyzed in order to understand different phases of neck loading during rear-end impact. BACKGROUND The mechanism of whiplash injury remains largely unknown. An understanding of the underlying kinematics of whiplash is crucial to the identification of possible injury mechanisms before countermeasures can be designed. METHODS Metallic markers were inserted into the vertebral bodies and spinous processes of each of the seven cervical vertebrae. Relative displacement-time traces between each pair of adjacent cervical vertebrae were calculated from X-ray data. Qualitative analyses of the kinematics of the neck at different phase of impact were performed. RESULTS The neck experiences compression, tension, shear, flexion and extension at different cervical levels and/or during different stages of the whiplash event. CONCLUSIONS Neck kinematics during whiplash is rather complicated and greatly influenced by the rotation of the thoracic spine, which occurs as a result of the straightening of the kyphotic thoracic curvature. RELEVANCE Understanding the complicated kinematics of a rear-end impact may help clinicians and researchers shed some light on potential mechanisms of whiplash neck injury.
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Affiliation(s)
- F Luan
- Bioengineering Center, Wayne State University, 818 W. Hancock, Detroit, MI 48202, USA
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Yan Z, Yan X, Yan X, Luan F, Wang C. [Study on the inactivated vaccine of Gardnerella vaginalis of fox. VI. Experimental development of the inactivated vaccine of Gardnerella vaginalis of fox]. Wei Sheng Wu Xue Bao 1997; 37:217-27. [PMID: 9863213] [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: 02/09/2023]
Abstract
The aluminum hydroxide gel, propolis and oil adjuvant inactivated vaccines were developed by silecting good immunity, representing principal epidemic serotype I GVF44 of Gardnerella vaginalis of fox in civil. The results showed that the aluminum hydroxide gel vaccine in safety was better than propolis and oil adjuvant vaccines, the most optimal inactivated concentration of formalin is 0.1%. Efficient immunity doses are 4 billon bacteria/1 ml. There were on any bad influences to occur for fox after the aluminum hydroxide gel of three times immunity doses were injected. The inoculated foxes could resist challenge of a hundred ID50 virulent strains after the vaccine was injected to foxes for 21 d. Immunity period of the vaccine is 6 months storage period is 10 months at 4-10 degrees C. The field experiments confirmed that the vaccine possessed accuracy, stability and reliability.
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Affiliation(s)
- Z Yan
- Speciality Institute of CAAS, Jilin
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45
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Luan F, Wang M, You W. [The correlation of TGF-alpha, EGFR in precancerous lesions and carcinoma of stomach with PCNA expression]. Zhonghua Bing Li Xue Za Zhi 1997; 26:31-4. [PMID: 10072847] [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: 02/11/2023]
Abstract
OBJECTIVE To assess the changes and possible role of expression of TGF-alpha and EGFR in gastric carcinogenesis and its relationship with PCNA labelling index (PCNA LI). METHODS Immunohistochemical study using LSAB kit. RESULTS (1) The expression of TGF-alpha was increased in normal mucosa and metaplastic tissue near the carcinoma when compared with non-cancer controls (P < 0.01). (2) Increased expression of EGFR was found in the intestinal metaplastic and dysplastic areas compared with nomral mucosa and carcinoma tissue (P < 0.01). (3) Coexpression rate of TGF-alpha and EGFR was higher in dysplasia than in other tissues (P < 0.01). (4) There was a close correlation between the intensities of TGF-alpha, EGFR and PCNA. (5) The expression of TGF-alpha, EGFR and PCNA was not related to infiltration and lymph node metastasis of gastric carcinoma. CONCLUSION The increased expression of EGFR, TGF-alpha may serve as an important molecular marker of gastric premalignant lesions when combined with measurement of PCNA LI and may be of assistance in screening of early gastric carcinoma in high risk populations.
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Affiliation(s)
- F Luan
- Department of Gastroenterology, General Hospital of the PLA, Beijing
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46
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Yan X, Yan Z, Yan X, Luan F, Wang C. [A new zoonosis--investigation of Gardnerella vaginalis disease of fox. V. Studies serotype of Gardnerella vaginalis in fox]. Wei Sheng Wu Xue Bao 1996; 36:373-8. [PMID: 9639824] [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: 02/07/2023]
Abstract
145 strains Gardnerella vaginalis isolated in foxes were isolated from 13 main farms raising foxes in six provinces (regions), China, after antigenicity and immunogenicity of the strains were measured, 1-3 appropriate strains were selected from each farm raising foxes for serotype studies. Cross agglutinin absorption test confirmed that selected 26 strains Gardnerella vaginalis were divided into three serotypes and then the representing strains were used to produce typing serum. Among remaining 119 strain, 108 strains were typable with the typing sera, and 11 strains can't be set. Among three serotypes, serotype I made up 79.1% of the strains. It was shown that serotype I was the principal serotype of Gardnerella vaginalis of fox in China. The test also confirmed that 5 strains of Gardnerella vaginalis isolated from racoon dog, 4 strain Gardnerella vaginalis from mink and 2 strains Gardnerella vaginalis from canine also belonged to serotype I. Supersonic antigben was produced with three serotypes, representative strains. By agar immuno-diffusion test, it confirmed that the antigens of three serotypes formed a obvious blending precipitating line with the homologous or heterologous serotype antiserum. It indicated common antigen existed among all serotypes. The agar immuno-diffusion test results revealed that the precipitating line of the homologous serotype completely blended. It is our opinion that the method of serotyping is reliable.
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Affiliation(s)
- X Yan
- Speciality Institute of CAAS, Jilin
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47
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Yan X, Yan Z, Yan X, Luan F, Wang C. [A new zoonosis--investigation of Gardnerella vaginalis disease of fox. IV. Study of dot-ELISA for the detection of serum antibody of Gardnerella vaginalis disease of fox]. Wei Sheng Wu Xue Bao 1995; 35:287-91. [PMID: 7483585] [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: 01/25/2023]
Abstract
192 Gardnerella vaginalis antibody positive sera from artifically infected foxes, immunized foxes and foxes that the bacterial examination were positive were analysed by the established Dot-ELISA. The results showed that 187/192 were positive, the positive rate was 97.3%. Block and cross tests showed that the method was specific. The method was 28.1 times sensitive as PAT and 5.5 times sensitive as MAT respectively. The repeatability of the test was good and the positive coincidence rate among the three techniques was 100%.
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Affiliation(s)
- X Yan
- Speciality Institute of CAAS, Jilin
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48
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Yan Z, Yan X, Luan F, Yan X, Wang C. [A new zoonosis--investigation of Gardnerella vaginalis disease of fox. III. Epidemiological investigation]. Wei Sheng Wu Xue Bao 1995; 35:209-15. [PMID: 7631502] [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: 01/26/2023]
Abstract
By epidemiological investigation to Gardnerella vaginalis disease of fox of civil main farms raising foxes, this disease was showed to be susceptible to silver foxes, arctic foxes, red foxes and color foxes, the disease was mostly transmitted by copulation, infected foxes played the leading role in epidemic of the disease. Investigative results of all farms raising foxes showed infection rate of fox groups was 0.9-21.9%, resulting in abortion rate was 1.5-14.7%, empty rate was 3.2-47.5%. Serious harm was revealed to the disease. By serology and causative agent isolation, we had proved that the disease was able to infect feeder and manager, it belongs to zoonosis. Racoondog. mink and canine infect with the disease besides fox. White mouse, big white rat, gopher, guinea pig and rabbit for laboratory are not infected with the disease.
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Affiliation(s)
- Z Yan
- Speciality Institute of CAAS, Jilin
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Luan F, Yin HY, Dong PY. [Observation on treatment of mailuoning injection for 46 pregnancy induced hypertension patients]. Zhongguo Zhong Xi Yi Jie He Za Zhi 1995; 15:153-5. [PMID: 7647530] [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: 01/26/2023]
Abstract
In order to observe the effect of treatment of Mailuoning Injection (MI) for pregnancy induced hypertension (PIH), 46 PIH patients in treated group were treated with intravenous dripping of MI and 40 patients in control group were treated with intravenous dripping of 25% magnesium sulfas. The result showed: The headache and edema ameliorated significantly in treated group in comparison with control (P < 0.05). Both methods could decrease the levels of mean arterial pressure, but the former's lowering arterial pressure was better than that of latter's (P < 0.05-0.01). The improvements of hemorheology in both groups after treatment were found, but the decrease of hematocrit was more significant in treated group (P < 0.05). No difference was found in albuminuria, delivery pattern, postpartum bleeding and neonatal Apgar Score between the two groups. The result suggested that the MI could prevent the progress of pathological process of the PIH, and relieve the systemic arteriolospasm, improve the microcirculation, change the hypercoagulability of the patients' blood and increase the blood flow in the patient of PIH.
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Affiliation(s)
- F Luan
- First Affiliated Hospital of Kaifeng Medical Institute, Henan
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Yan Z, Yan X, Luan F, Yan X. [A new zoonosis--investigation of Gardnerella vaginalis disease of fox. I. Causative agent isolation and artificial infection]. Wei Sheng Wu Xue Bao 1995; 35:28-32. [PMID: 7725679] [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: 01/26/2023]
Abstract
It is the first time that this paper reports on using improved rabbit blood agar culture medium to isolate 145 strains Gardnerella vaginalis from the foxes and their abortion fortus organs of main fox farms. Among the strains, 26 strains were isolated from the abortion foetus organs, isolation rate was 92.86%; 118 strains were isolated from the vaginal exeretion of the abortion and empty foxes, isolation rate was 34.01%; 1 strain was isolated from inguinal lymph node of the pelted positive fox, isolation rate was 2%. None was isolated from blood. By causative agent isolation, we revealed the bacterium survival position in vivo, and the best isolation route isolation opportunity and isolation methods were selected. By artificial infection test, we have proved pathogenicity of the bacterium.
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Affiliation(s)
- Z Yan
- Speciality Institute of CAAS, Jilin
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