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Morales N, Anche MT, Kaczmar NS, Lepak N, Ni P, Romay MC, Santantonio N, Buckler ES, Gore MA, Mueller LA, Robbins KR. Spatio-temporal modeling of high-throughput multi-spectral aerial images improves agronomic trait genomic prediction in hybrid maize. Genetics 2024:iyae037. [PMID: 38469622 DOI: 10.1093/genetics/iyae037] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Revised: 12/02/2023] [Accepted: 02/18/2024] [Indexed: 03/13/2024] Open
Abstract
Design randomizations and spatial corrections have increased understanding of genotypic, spatial, and residual effects in field experiments, but precisely measuring spatial heterogeneity in the field remains a challenge. To this end, our study evaluated approaches to improve spatial modeling using high-throughput phenotypes (HTP) via unoccupied aerial vehicle (UAV) imagery. The normalized difference vegetation index (NDVI) was measured by a multi-spectral MicaSense camera and processed using ImageBreed. Contrasting to baseline agronomic trait spatial correction and a baseline multi-trait model, a two-stage approach was proposed. Using longitudinal NDVI data, plot level permanent environment (PE) effects estimated spatial patterns in the field throughout the growing season. NDVI PE were separated from additive genetic effects using two-dimensional spline (2DSpl), separable autoregressive (AR1) models, or random regression models (RR). The PE were leveraged within agronomic trait genomic best linear unbiased prediction (GBLUP) either modeling an empirical covariance for random effects, or by modeling fixed effects as an average of PE across time or split among three growth phases. Modeling approaches were tested using simulation data and Genomes-to-Fields (G2F) hybrid maize (Zea mays L.) field experiments in 2015, 2017, 2019, and 2020 for grain yield, grain moisture, and ear height. The two-stage approach improved heritability, model fit, and genotypic effect estimation compared to baseline models. Electrical conductance and elevation from a 2019 soil survey significantly improved model fit, while 2DSpl PE were most strongly correlated with the soil parameters. Simulation of field effects demonstrated improved specificity for RR models. In summary, the use of longitudinal NDVI measurements increased experimental accuracy and understanding of field spatio-temporal heterogeneity.
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Affiliation(s)
- Nicolas Morales
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA
| | - Mahlet T Anche
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA
| | - Nicholas S Kaczmar
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA
| | - Nicholas Lepak
- United States Department of Agriculture-Agricultural Research Service, Robert W. Holley Center for Agriculture and Health, Ithaca, NY, 14853, USA
| | - Pengzun Ni
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA
- College of Bioscience and Biotechnology, Shenyang Agricultural University, Shenyang, China
| | - Maria Cinta Romay
- Institute for Genomic Diversity, Cornell University, Ithaca, NY, 14853, USA
| | - Nicholas Santantonio
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA
- School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA, 24061, USA
| | - Edward S Buckler
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA
- Institute for Genomic Diversity, Cornell University, Ithaca, NY, 14853, USA
- United States Department of Agriculture-Agricultural Research Service, Robert W. Holley Center for Agriculture and Health, Ithaca, NY, 14853, USA
| | - Michael A Gore
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA
| | - Lukas A Mueller
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA
- Boyce Thompson Institute, Ithaca, NY, 14853, USA
| | - Kelly R Robbins
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA
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Abouzeid CA, Santos E, Chacon KL, Ni P, Kelter BM, Gibran NS, Kowalske KJ, Kazis LE, Ryan CM, Schneider JC. Examining the impact of the COVID-19 pandemic on participants in a study of burn outcomes. Burns 2023; 49:1232-1235. [PMID: 37193614 PMCID: PMC10081876 DOI: 10.1016/j.burns.2023.04.001] [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] [Received: 03/16/2023] [Accepted: 04/04/2023] [Indexed: 05/18/2023]
Affiliation(s)
- C A Abouzeid
- Department of Physical Medicine & Rehabilitation, Spaulding Rehabilitation Hospital, 300 1st Avenue, Charlestown, MA 02129, USA
| | - E Santos
- Department of Physical Medicine & Rehabilitation, Spaulding Rehabilitation Hospital, 300 1st Avenue, Charlestown, MA 02129, USA
| | - K L Chacon
- Department of Physical Medicine & Rehabilitation, Spaulding Rehabilitation Hospital, 300 1st Avenue, Charlestown, MA 02129, USA
| | - P Ni
- Department of Health Law, Policy, and Management, Boston University School of Public Health, 715 Albany Street, Boston, MA 02118, USA
| | - B M Kelter
- Department of Physical Medicine & Rehabilitation, Spaulding Rehabilitation Hospital, 300 1st Avenue, Charlestown, MA 02129, USA
| | - N S Gibran
- Department of Surgery, The University of Washington, 1959 NE Pacific St, Seattle, WA 98195, USA
| | - K J Kowalske
- Department of Physical Medicine and Rehabilitation, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA
| | - L E Kazis
- Department of Physical Medicine & Rehabilitation, Spaulding Rehabilitation Hospital, 300 1st Avenue, Charlestown, MA 02129, USA; Department of Health Law, Policy, and Management, Boston University School of Public Health, 715 Albany Street, Boston, MA 02118, USA; Rehabilitation Outcomes Center at Spaulding, Spaulding Rehabilitation, 300 1st Avenue, Charlestown, MA, 02129, USA
| | - C M Ryan
- Department of Surgery, Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114, USA; Department of Surgery, Shriners Children's, 51 Blossom Street, Boston, MA 02114, USA; Harvard Medical School, 25 Shattuck Street, Boston, MA 02115, USA
| | - J C Schneider
- Department of Physical Medicine & Rehabilitation, Spaulding Rehabilitation Hospital, 300 1st Avenue, Charlestown, MA 02129, USA; Rehabilitation Outcomes Center at Spaulding, Spaulding Rehabilitation, 300 1st Avenue, Charlestown, MA, 02129, USA; Department of Physical Medicine and Rehabilitation, Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114, USA; Harvard Medical School, 25 Shattuck Street, Boston, MA 02115, USA.
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Wei X, Cheng D, Shao C, Pang K, Xiao J, Zhang Y, Wu M, Zhang L, Ni P, Zhang F. A comparative study of pilomatricoma and epidermoid cyst with ultrasound. Clin Radiol 2023; 78:e582-e589. [PMID: 37183139 DOI: 10.1016/j.crad.2023.04.006] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 04/09/2023] [Accepted: 04/19/2023] [Indexed: 05/16/2023]
Abstract
AIM To explore and compare the ultrasonic (US) features of pilomatricoma (PM) and epidermoid cyst (EC) in the differential diagnosis and improve the accuracy of US diagnosis of PM. MATERIALS AND METHODS Three hundred and nine patients who underwent US examination before surgery with a histopathological diagnosis of PM or EC after surgery were analysed retrospectively. The patients were categorised into the training and validation sets according to the inspection times. Univariate analysis was undertaken on the US and clinical features of PM and statistically significant variables (p<0.05) were included in the multivariate logistic regression model to establish a diagnostic model. RESULTS The results demonstrated that the multivariate logistic regression model for PM was statistically significant (p<0.001). The risk factors included posterior echo attenuation and hypoechoic halos (odds ratio [OR] = 9.277, 10.254) and the protective factors included age, diameter thickness, and posterior echo enhancement (OR=0.936, 0.302, 0.156). The performance of the diagnostic model was tested using the training set (area under the receiver operating characteristic curve [AUC] = 0.974, 95% confidence interval [CI] = 0.955-0.994) and the validation set (AUC = 0.967, 95% CI = 0.926-1.000), which demonstrated good discriminant ability. CONCLUSIONS The diagnostic accuracy for PM was higher than that for EC when the nodule is characterised by posterior echo attenuation, hypoechoic halos, smaller thickness, and younger age. The US diagnostic model developed may be used to guide the diagnosis of PM.
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Affiliation(s)
- X Wei
- Department of Ultrasound, the Second Hospital of Shandong University, Jinan, Shandong, China
| | - D Cheng
- Department of Radiology, Jinan Fourth People's Hospital, Jinan, Shandong, China
| | - C Shao
- Department of Evidence-Based Medicine, the Second Hospital of Shandong University, Jinan, Shandong, China
| | - K Pang
- Department of Ultrasound, the Second Hospital of Shandong University, Jinan, Shandong, China
| | - J Xiao
- Department of Evidence-Based Medicine, the Second Hospital of Shandong University, Jinan, Shandong, China
| | - Y Zhang
- Department of Ultrasound, the Second Hospital of Shandong University, Jinan, Shandong, China
| | - M Wu
- Department of Ultrasound, the Second Hospital of Shandong University, Jinan, Shandong, China
| | - L Zhang
- Department of Pathology, the Second Hospital of Shandong University, Jinan, Shandong, China
| | - P Ni
- Department of Ultrasound, the Second Hospital of Shandong University, Jinan, Shandong, China
| | - F Zhang
- Department of Ultrasound, the Second Hospital of Shandong University, Jinan, Shandong, China.
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Li MD, Ni P, Yu HH, Yu ZF, Sun JX, Bai MY, Bai S, An XX, Shi YH, Liu YY. [Analysis on the status quo of the awareness rate of core knowledge of cancer prevention and treatment and its influencing factors among residents in Liaoning Province in 2021]. Zhonghua Yu Fang Yi Xue Za Zhi 2023; 57:22-28. [PMID: 36655253 DOI: 10.3760/cma.j.cn112150-20220309-00216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Objective: To analyze the status quo of the knowledge and related factors of cancer prevention and treatment among residents in Liaoning Province in 2021. Methods: From August to November 2021, through network sampling method, 17 474 permanent residents aged 15-69 years in Liaoning Province were surveyed. The WeChat public account was used to collect information such as demographic characteristics and core knowledge of cancer prevention and treatment. The Chi-square test was used to compare the difference of the level of the cancer prevention and treatment knowledge among different groups. The multivariate logistic regression model was used to analyze the related factors. Results: Among the 17 474 subjects, 43.1% (7 528) were male and 58.7% (10 262) were urban residents. The overall awareness rate was 72.3%, and the awareness rate of cancer cognition, prevention, early diagnosis and treatment, cancer management and rehabilitation were 71.4%, 67.6%, 72.7%, 83.4% and 63.5%, respectively. The multivariate logistic regression model showed that the residents who were man (OR: 0.850, 95%CI: 0.781-0.925), in rural areas (OR: 0.753, 95%CI: 0.694-0.817), 55-59 years old (OR: 0.851, 95%CI: 0.751-0.963), quitters (OR: 0.721, 95%CI: 0.640-0.813) and smoker (OR: 0.724, 95%CI: 0.654-0.801) had lower awareness rates, while the residents who were 35-54 years old (OR: 1.312, 95%CI: 1.202-1.432), with an educational level of junior high school/senior high school/college degree or above (OR: 1.834-5.130, 95%CI: 1.575-6.047), technical personnel (OR: 1.592, 95%CI: 1.367-1.854), civil servant/institution staff (OR: 1.282, 95%CI: 1.094-1.503), enterprise/business/service staff (OR: 1.218, 95%CI: 1.071-1.385), retired (OR: 1.324, 95%CI: 1.114-1.573) and with family history of cancer (OR: 1.369, 95%CI: 1.266-1.481) had higher awareness rates. Conclusion: The level of the awareness of core knowledge of cancer prevention and treatment among residents in Liaoning Province has met the requirements of the Healthy China Action. Region, gender, education level, age, family history of cancer and smoking are relevant factors.
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Affiliation(s)
- M D Li
- Department of Liaoning Office for Cancer Prevention and Control, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, Shenyang 110042, China
| | - P Ni
- Department of Liaoning Office for Cancer Prevention and Control, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, Shenyang 110042, China
| | - H H Yu
- Department of Liaoning Office for Cancer Prevention and Control, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, Shenyang 110042, China
| | - Z F Yu
- Department of Liaoning Office for Cancer Prevention and Control, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, Shenyang 110042, China
| | - J X Sun
- Department of Chronic Disease Prevention and Control, Dandong Cencer for Disease Control and Prevention, Dandong 118000, China
| | - M Y Bai
- Department of Chronic Disease Prevention and Control, Yingkou Cencer for Disease Control and Prevention, Yingkou 115000, China
| | - S Bai
- Department of Chronic Disease Prevention and Control, Shenyang Cencer for Disease Control and Prevention, Shenyang 110031, China
| | - X X An
- Department of Chronic Disease Prevention and Control, Benxi Cencer for Disease Control and Prevention, Benxi 117000, China
| | - Y H Shi
- Department of Chronic Disease Prevention and Control, Tieling Cencer for Disease Control and Prevention, Tieling 112099, China
| | - Y Y Liu
- Department of Liaoning Office for Cancer Prevention and Control, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, Shenyang 110042, China
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Ni P, Anche MT, Ruan Y, Dang D, Morales N, Li L, Liu M, Wang S, Robbins KR. Genomic Prediction Strategies for Dry-Down-Related Traits in Maize. Front Plant Sci 2022; 13:930429. [PMID: 35845649 PMCID: PMC9280646 DOI: 10.3389/fpls.2022.930429] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 05/23/2022] [Indexed: 06/15/2023]
Abstract
For efficient mechanical harvesting, low grain moisture content at harvest time is essential. Dry-down rate (DR), which refers to the reduction in grain moisture content after the plants enter physiological maturity, is one of the main factors affecting the amount of moisture in the kernels. Dry-down rate is estimated using kernel moisture content at physiological maturity and at harvest time; however, measuring kernel water content at physiological maturity, which is sometimes referred as kernel water content at black layer formation (BWC), is time-consuming and resource-demanding. Therefore, inferring BWC from other correlated and easier to measure traits could improve the efficiency of breeding efforts for dry-down-related traits. In this study, multi-trait genomic prediction models were used to estimate genetic correlations between BWC and water content at harvest time (HWC) and flowering time (FT). The results show there is moderate-to-high genetic correlation between the traits (0.24-0.66), which supports the use of multi-trait genomic prediction models. To investigate genomic prediction strategies, several cross-validation scenarios representing possible implementations of genomic prediction were evaluated. The results indicate that, in most scenarios, the use of multi-trait genomic prediction models substantially increases prediction accuracy. Furthermore, the inclusion of historical records for correlated traits can improve prediction accuracy, even when the target trait is not measured on all the plots in the training set.
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Affiliation(s)
- Pengzun Ni
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Liaoning Province Research Center of Plant Genetic Engineering Technology, College of Biological Science and Technology, Shenyang Agricultural University, Shenyang, China
- Section of Plant Breeding and Genetics, School of Integrative Plant Sciences, Cornell University, Ithaca, NY, United States
- College of Agronomy, Shenyang Agricultural University, Shenyang, China
| | - Mahlet Teka Anche
- Section of Plant Breeding and Genetics, School of Integrative Plant Sciences, Cornell University, Ithaca, NY, United States
| | - Yanye Ruan
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Liaoning Province Research Center of Plant Genetic Engineering Technology, College of Biological Science and Technology, Shenyang Agricultural University, Shenyang, China
| | - Dongdong Dang
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Liaoning Province Research Center of Plant Genetic Engineering Technology, College of Biological Science and Technology, Shenyang Agricultural University, Shenyang, China
| | - Nicolas Morales
- Section of Plant Breeding and Genetics, School of Integrative Plant Sciences, Cornell University, Ithaca, NY, United States
| | - Lingyue Li
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Liaoning Province Research Center of Plant Genetic Engineering Technology, College of Biological Science and Technology, Shenyang Agricultural University, Shenyang, China
| | - Meiling Liu
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Liaoning Province Research Center of Plant Genetic Engineering Technology, College of Biological Science and Technology, Shenyang Agricultural University, Shenyang, China
| | - Shu Wang
- College of Agronomy, Shenyang Agricultural University, Shenyang, China
| | - Kelly R. Robbins
- Section of Plant Breeding and Genetics, School of Integrative Plant Sciences, Cornell University, Ithaca, NY, United States
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Resnik L, Ni P, Borgia M, Clark M. A Psychosocial Adjustment Measure for Persons With Upper Limb Amputation. Can Prosthet Orthot J 2022; 5:37873. [PMID: 37614482 PMCID: PMC10443488 DOI: 10.33137/cpoj.v5i1.37873] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 03/10/2022] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Measurement of psychosocial adjustment after upper limb amputation (ULA) could be helpful in identifying persons who may benefit from interventions, such as psychotherapy and/or support groups. However, available measures of psychosocial adjustment after limb loss are currently designed for prosthetic users only. OBJECTIVE To create a measure of psychosocial adjustment for persons with ULA that could be completed by individuals regardless of whether a prosthesis is use. METHODOLOGY We modified items from an existing Trinity Amputation and Prosthesis Experience Survey (TAPES) measure and generated new items pertinent to persons who did not use a prosthesis. Item content was refined through cognitive interviewing and pilot testing. A telephone survey of 727 persons with major ULA (63.6% male, mean age of 54.4) was conducted after pilot-testing. After exploratory and confirmatory factor analyses (EFA and CFA), Rasch analyses were used to evaluate response categories, item fit and differential item functioning (DIF). Item-person maps, score distributions, and person and item reliability were examined. Test-retest reliability was evaluated in a 50-person subsample. FINDINGS EFA and CFA indicated a two-factor solution. Rasch analyses resulted in a 7-item Adjustment to Limitation subscale (CFI=0.96, TLI=0.95, RMSEA=0.128) and a 9-item Work and Independence subscale (CFI=0.935, TLI=0.913, RMSEA=0.193). Cronbach alpha and ICC were 0.82 and 0.63 for the Adjustment to Limitation subscale and 0.90 and 0.80 for the Work and Independence subscale, respectively. CONCLUSIONS This study developed the Psychosocial Adjustment to Amputation measure, which contains two subscales: 1) Adjustment to Limitation and 2) Work and Independence. The measure has sound structural validity, good person and item reliability, and moderate to good test-retest reliability.
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Affiliation(s)
- L.J. Resnik
- Research Department, Providence VA Medical Center, Providence, USA
- Department of Health Services, Policy and Practice, Brown University, Providence, USA
| | - P. Ni
- Biostatistics and Epidemiology Data Analytics Center (BEDAC), Boston University School of Public Health, Boston, USA
| | - M.L. Borgia
- Research Department, Providence VA Medical Center, Providence, USA
| | - M.A. Clark
- Department of Health Services, Policy and Practice, Brown University, Providence, USA
- Department of Population and Quantitative Health Sciences, University of Massachusetts Medical School, Massachusetts, USA
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Shen Y, Ni P, Men RT, Yang L. [A case report of rare cause of abnormal liver function: sitosterolemia]. Zhonghua Gan Zang Bing Za Zhi 2021; 29:477-479. [PMID: 34107589 DOI: 10.3760/cma.j.cn501113-20191009-00366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Affiliation(s)
- Y Shen
- Department of Gastroenterology & Hepatology, West China Hospital, Sichuan University, Chengdu 610041, China
| | - P Ni
- Department of Gastroenterology & Hepatology, West China Hospital, Sichuan University, Chengdu 610041, China
| | - R T Men
- Department of Gastroenterology & Hepatology, West China Hospital, Sichuan University, Chengdu 610041, China
| | - L Yang
- Department of Gastroenterology & Hepatology, West China Hospital, Sichuan University, Chengdu 610041, China
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Liu M, He W, Zhang A, Zhang L, Sun D, Gao Y, Ni P, Ma X, Cui Z, Ruan Y. Genetic analysis of maize shank length by QTL mapping in three recombinant inbred line populations. Plant Sci 2021; 303:110767. [PMID: 33487352 DOI: 10.1016/j.plantsci.2020.110767] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 11/12/2020] [Accepted: 11/17/2020] [Indexed: 06/12/2023]
Abstract
In maize, the shank is a unique tissue linking the stem to the ear. Shank length (SL) mainly affects the transport of photosynthetic products to the ear and the dehydration of kernels via regulated husk morphology. The limited studies on SL revealed it is a highly heritable quantitative trait controlled by significant additive and additive-dominance effects. However, the genetic basis of SL remains unclear. In this study, we analyzed three maize recombinant inbred line (RIL) populations to elucidate the molecular mechanism underlying the SL. The data indicated the SL varied among the three RIL populations and was highly heritable. Additionally, the SL was positively correlated with the husk length (HL), husk number (HN), ear length (EL), and ear weight (EW) in the BY815/K22 (BYK) and CI7/K22 (CIK) RIL populations, but was negatively correlated with the husk width (HW) in the BYK RIL population. Moreover, 10 quantitative trait loci (QTL) for SL were identified in the three RIL populations, five of which were large-effect QTL. The percentage of the total phenotypic variation explained by the QTL for SL was 13.67 %, 20.45 %, and 30.81 % in the BY815/DE3 (BYD), BYK, and CIK RIL populations, respectively. Further analyses uncovered some genetic overlap between SL and EL, SL and ear row number (ERN), SL and cob weight (CW), and SL and HN. Unlike the large-effect QTL qSL BYK-2-2, which spanned the centromere, the other four large-effect QTL were delimited to a single peak bin via bin map. Furthermore, 2, 5, 6, and 12 genes associated with SL were identified for qSL BYK-2-1, qSL CIK-2-1, qSL CIK-9-1, and qSL CIK-9-2, respectively. Five of the candidate genes for SL may contribute to the hormone metabolism and sphingolipid biosynthesis regulating cell elongation, division, differentiation, and expansion. These results may be relevant for future studies on the genetic basis of SL and for the molecular breeding of maize based on marker-assisted selection to develop new varieties with an ideal SL.
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Affiliation(s)
- Meiling Liu
- College of Biological Science and Technology, Liaoning Province Research Center of Plant Genetic Engineering Technology, Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang Agricultural University, Shenyang, 110866, China
| | - Wenshu He
- College of Biological Science and Technology, Liaoning Province Research Center of Plant Genetic Engineering Technology, Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang Agricultural University, Shenyang, 110866, China; Department of Plant Production and Forestry Science, University of Lleida-Agrotecnio Center, Av. Alcalde Rovira Roure, Lleida, 25198, Spain
| | - Ao Zhang
- College of Biological Science and Technology, Liaoning Province Research Center of Plant Genetic Engineering Technology, Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang Agricultural University, Shenyang, 110866, China
| | - Lijun Zhang
- College of Biological Science and Technology, Liaoning Province Research Center of Plant Genetic Engineering Technology, Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang Agricultural University, Shenyang, 110866, China
| | - Daqiu Sun
- College of Biological Science and Technology, Liaoning Province Research Center of Plant Genetic Engineering Technology, Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang Agricultural University, Shenyang, 110866, China
| | - Yuan Gao
- College of Biological Science and Technology, Liaoning Province Research Center of Plant Genetic Engineering Technology, Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang Agricultural University, Shenyang, 110866, China
| | - Pengzun Ni
- College of Biological Science and Technology, Liaoning Province Research Center of Plant Genetic Engineering Technology, Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang Agricultural University, Shenyang, 110866, China
| | - Xinglin Ma
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, 100081, China
| | - Zhenhai Cui
- College of Biological Science and Technology, Liaoning Province Research Center of Plant Genetic Engineering Technology, Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang Agricultural University, Shenyang, 110866, China.
| | - Yanye Ruan
- College of Biological Science and Technology, Liaoning Province Research Center of Plant Genetic Engineering Technology, Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang Agricultural University, Shenyang, 110866, China.
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Quach E, Kazis L, Zhao S, Ni P, Clark V, McDannold S, Hartmann C. Safety Climate Associated with Adverse Events in Nursing Homes: A National VA Study. Health Serv Res 2020. [DOI: 10.1111/1475-6773.13445] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- E. Quach
- UMASS Boston Boston MA United States
- Center for Healthcare Organization and Implementation Research Bedford MA United States
- New England Geriatric Research Education and Clinical Center Bedford MA United States
| | - L. Kazis
- Center for Healthcare Organization and Implementation Research Bedford MA United States
- Boston University School of Public Health Boston MA United States
| | - S. Zhao
- Center for Healthcare Organization and Implementation Research Bedford MA United States
| | - P. Ni
- Boston University School of Public Health Boston MA United States
| | - V. Clark
- Center for Healthcare Organization and Implementation Research Bedford MA United States
| | - S. McDannold
- Center for Healthcare Organization and Implementation Research Bedford MA United States
| | - C. Hartmann
- Center for Healthcare Organization and Implementation Research Bedford MA United States
- UMASS Lowell Lowell MA United States
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Jiang S, Zhang H, Ni P, Yu S, Dong H, Zhang A, Cao H, Zhang L, Ruan Y, Cui Z. Genome-Wide Association Study Dissects the Genetic Architecture of Maize Husk Tightness. Front Plant Sci 2020; 11:861. [PMID: 32695127 PMCID: PMC7338587 DOI: 10.3389/fpls.2020.00861] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Accepted: 05/27/2020] [Indexed: 06/01/2023]
Abstract
The husk is a leafy outer tissue that encloses a maize ear. Previously, we identified the optimum husk structure by measuring the husk length, husk layer number, husk thickness and husk width. Husk tightness (HTI) is a combined trait based on the above four husk measurements. Unveiling the genetic basis of HTI will aid in guiding the genetic improvement of maize for mechanical harvesting and for protecting the ear from pest damage and pathogen infection. Here, we used a maize associate population of 508 inbred lines with tropical, subtropical and temperate backgrounds to analyze the genetic architecture of HTI. Evaluating the phenotypic diversity in three different environments showed that HTI exhibited broad natural variations and a moderate heritability level of 0.41. A diversity analysis indicated that the inbred lines having a temperate background were more loosely related than those having a tropical or subtropical background. HTI showed significant negative correlations with husk thickness and width, which indicates that thicker and wider husks wrapped the ear tighter than thinner and slimmer husks. Combining husk traits with ∼1.25 million single nucleotide polymorphisms in a genome-wide association study revealed 27 variants that were significantly associated with HTI above the threshold of P < 7.26 × 10-6. We found 27 candidate genes for HTI that may participate in (1) husk senescence involving lipid peroxidation (GRMZM2G017616) and programmed cell death (GRMZM2G168898 and GRMZM2G035045); (2) husk morphogenesis involving cell division (GRMZM5G869246) and cell wall architecture (GRMZM2G319798); and (3) cell signal transduction involving protein phosphorylation (GRMZM2G149277 and GRMZM2G004207) and the ABSISIC ACID INSENSITIVE3/VIVIPAROUS1 transcription factor (GRMZM2G088427). These results provide useful information for understanding the genetic basis of husk development. Further studies of identified candidate genes will help elucidate the molecular pathways that regulate HTI in maize.
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Affiliation(s)
- Siqi Jiang
- College of Bioscience and Biotechnology, Shenyang Agricultural University, henyang, China
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang, China
| | - Haibo Zhang
- College of Bioscience and Biotechnology, Shenyang Agricultural University, henyang, China
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang, China
| | - Pengzun Ni
- College of Bioscience and Biotechnology, Shenyang Agricultural University, henyang, China
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang, China
| | - Shuai Yu
- College of Bioscience and Biotechnology, Shenyang Agricultural University, henyang, China
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang, China
| | - Haixiao Dong
- College of Plant Sciences, Jilin University, Changchun, China
| | - Ao Zhang
- College of Bioscience and Biotechnology, Shenyang Agricultural University, henyang, China
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang, China
| | - Huiying Cao
- College of Bioscience and Biotechnology, Shenyang Agricultural University, henyang, China
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang, China
| | - Lijun Zhang
- College of Bioscience and Biotechnology, Shenyang Agricultural University, henyang, China
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang, China
| | - Yanye Ruan
- College of Bioscience and Biotechnology, Shenyang Agricultural University, henyang, China
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang, China
| | - Zhenhai Cui
- College of Bioscience and Biotechnology, Shenyang Agricultural University, henyang, China
- Shenyang Key Laboratory of Maize Genomic Selection Breeding, Shenyang, China
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11
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Shan LH, An XY, Xu MM, Fan SP, Zhong H, Ni P, Chi H. [Analysis on the trend of innovation and development in the field of ophthalmology]. Zhonghua Yan Ke Za Zhi 2018; 54:452-463. [PMID: 29895120 DOI: 10.3760/cma.j.issn.0412-4081.2018.06.012] [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 systematically analyze the innovation and development trend in the field of ophthalmology. Methods: The latest ophthalmology funding program from the National Eye Institute and National Natural Science Foundation of China, and funding project for 2012 to 2016 from the National Institutes of Health, National Natural Science Foundation of China and National key research and development plan of China was collected. Using the comparative analysis method, the major ophthalmology funding areas at home and abroad were analyzed. Papers published in 2012 to 2016 in the field of ophthalmology were collected from the Web of Science Core Collection, among which ESI highly cited papers and hot papers were particularly selected. Using bibliometric methods, the time trend of the number of papers and the citation frequency were analyzed. Using the co-occurrence cluster analysis method, the continued focuses and emerging concerns of ophthalmology papers was analyzed. Results: The funding plan of the National Eye Institute mainly covers nine major diseases in ophthalmology. NSFC focuses on retinal damage and repair mechanisms. The National Key Research and Development Program of China focuses on research on high-end ophthalmic implants. NIH continues to focus on the molecular mechanisms of blinding eye disease such as diabetic retinopathy, age-related macular degeneration, glaucoma, corneal disease and cataracts, basic research in genetics, and advanced diagnostic techniques such as imaging. Latest areas of interest involve gene editing techniques and the application of stem cell technology in ophthalmology. In China, research and application of stem cells in ophthalmic diseases, intraocular sustained-release drug carrier, and precision medicine research in ophthalmology are emerging areas of funding. In 2012 to 2016, research topics of 168 papers collected by ESI focused on macular degeneration, retinal diseases, glaucoma and other eye diseases. How to quickly promote new drugs and new technological achievements to the clinical application is a problem in the field of ophthalmology. How to change the ophthalmology clinic model, so as to provide patients with convenient and quality service, has become a research topic that needs to be given attention to. Conclusions: Based on the multidimensional analysis of innovation and development in the field of ophthalmology, cross application and integration of ophthalmology and high - tech fields such as advanced imaging technology, stem cell technology, gene editing technology, molecular targeting, and artificial intelligence will provide a strong basis for the enhancement of China's ophthalmology research innovation and international competitiveness. Research efforts for ophthalmic transformation should be strengthened, in order to realize the clinical application of the achievements as soon as possible. (Chin J Ophthalmol, 2018, 54: 452-463).
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Affiliation(s)
- L H Shan
- Institute of Medical Information, Chinese Academy of Medical Sciences, Beijing 100020, China
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Su Z, Wang T, Zhu H, Zhang P, Han R, Liu Y, Ni P, Shen H, Xu W, Xu H. Corrigendum to "HMGB1 modulates Lewis cell autophagy and promotes cell survival via RAGE-HMGB1-Erk1/2 positive feedback during nutrient depletion" [Immunobiology 220 May (5) (2015) 539-44]. Immunobiology 2017; 223:258. [PMID: 29108874 DOI: 10.1016/j.imbio.2017.09.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Z Su
- The Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang 212001, China; Department of Immunology & Laboratory Immunology, Jiangsu University, Zhenjiang 212013, China.
| | - T Wang
- The Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang 212001, China; Department of Immunology & Laboratory Immunology, Jiangsu University, Zhenjiang 212013, China
| | - H Zhu
- Department of Immunology & Laboratory Immunology, Jiangsu University, Zhenjiang 212013, China; Department of Immunology, The Fourth Military Medical University, Xi'an 710032, China
| | - P Zhang
- The Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang 212001, China; Department of Immunology & Laboratory Immunology, Jiangsu University, Zhenjiang 212013, China
| | - R Han
- Department of Immunology, The Fourth Military Medical University, Xi'an 710032, China
| | - Y Liu
- The Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang 212001, China
| | - P Ni
- The Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang 212001, China; Department of Immunology & Laboratory Immunology, Jiangsu University, Zhenjiang 212013, China
| | - H Shen
- The Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang 212001, China
| | - W Xu
- The Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang 212001, China
| | - H Xu
- The Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang 212001, China; Department of Immunology & Laboratory Immunology, Jiangsu University, Zhenjiang 212013, China.
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Jacob M, Ni P, Leritz E, Driver J, Leveille S, Jette A, Bean J. MULTI-MORBIDITY PATTERNS AND DISABLEMENT SEVERITY AMONG MOBILITY LIMITED OLDER ADULTS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.340] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- M.E. Jacob
- Health and Disability Research Institute, Boston University, Brookline, Massachusetts,
- New England GRECC, VA Boston Healthcare System, Boston, Massachusetts,
- Harvard Medical School, Boston, Massachusetts,
| | - P. Ni
- Health and Disability Research Institute, Boston University, Brookline, Massachusetts,
| | - E. Leritz
- New England GRECC, VA Boston Healthcare System, Boston, Massachusetts,
- Harvard Medical School, Boston, Massachusetts,
| | - J. Driver
- New England GRECC, VA Boston Healthcare System, Boston, Massachusetts,
- Harvard Medical School, Boston, Massachusetts,
| | - S.G. Leveille
- University of Massachusetts Boston, Boston, Massachusetts
| | - A.M. Jette
- Health and Disability Research Institute, Boston University, Brookline, Massachusetts,
| | - J.F. Bean
- New England GRECC, VA Boston Healthcare System, Boston, Massachusetts,
- Harvard Medical School, Boston, Massachusetts,
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Su Z, Ni P, Zhou C, Wang J. Myeloid-Derived Suppressor Cells in Cancers and Inflammatory Diseases: Angel or Demon? Scand J Immunol 2016; 84:255-261. [PMID: 27541573 DOI: 10.1111/sji.12473] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2016] [Revised: 07/29/2016] [Accepted: 08/16/2016] [Indexed: 02/06/2023]
Affiliation(s)
- Z. Su
- Department of Immunology; Jiangsu University; Zhenjiang China
- The Central Laboratory; The Fourth Affiliated Hospital of Jiangsu University; Zhenjiang China
| | - P. Ni
- Department of Immunology; Jiangsu University; Zhenjiang China
- The Central Laboratory; The Fifth Affiliated Hospital of Nantong University; Taizhou China
| | - C. Zhou
- The Central Laboratory; The Fifth Affiliated Hospital of Nantong University; Taizhou China
| | - J. Wang
- Department of Immunology; Jiangsu University; Zhenjiang China
- The Central Laboratory; The Fourth Affiliated Hospital of Jiangsu University; Zhenjiang China
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15
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Mulcahey MJ, Slavin MD, Ni P, Vogel LC, Thielen CC, Coster WJ, Jette AM. The Pediatric Measure of Participation (PMoP) short forms. Spinal Cord 2016; 54:1183-1187. [DOI: 10.1038/sc.2016.68] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 03/14/2016] [Accepted: 03/30/2016] [Indexed: 11/09/2022]
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Kappos L, Arnold D, Bar-Or A, Camm J, Derfuss T, Kieseier B, Sprenger T, Greenough K, Ni P, Harada T. MT-1303, a novel selective s1p1 receptor modulator in RRMS - results of a placebo controlled, double blind phase II trial (momentum). J Neurol Sci 2015. [DOI: 10.1016/j.jns.2015.09.044] [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: 10/22/2022]
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17
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Kong F, Zheng D, She P, Ni P, Zhu H, Xu H, Su Z. Porphyromonas gingivalis B cell Antigen Epitope Vaccine, pIRES-ragB'-mGITRL, Promoted RagB-Specific Antibody Production and Tfh Cells Expansion. Scand J Immunol 2015; 81:476-82. [PMID: 25689343 DOI: 10.1111/sji.12281] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Accepted: 01/27/2015] [Indexed: 11/30/2022]
Abstract
The outer membrane protein RagB is one of the major virulence factors of Porphyromonas gingivalis (P. gingivalis). To prevent periodontitis and associated systemic diseases induced by P. gingivalis, we built B cell antigen epitope vaccine characterized by pIRES-ragB'-mGITRL to induce a protective immune responses. The B cell antigen epitope and scrambled peptide of ragB were predicted, cloned into pIRES and constructed pIRES-ragB', pIRES-scrambled epitopes and pIRES-ragB'-mGITRL. pIRES-ragB'-mGITRL was transfected into COS-7 cells. Subsequently, the 6-week-old female BALB/c mice were challenged by P. gingivalis following three time immunization by pIRES, pIRES-ragB', pIRES-scrambled epitopes and pIRES-ragB'-mGITRL. The levels of RagB-specific antibody in the serum and Tfh cells in the spleen were measured by ELISA and flow cytometry, respectively. And higher levels of RagB-specific IgG were produced in the immunized mice with pIRES-ragB'-mGITRL. Additionally, the number of Tfh cells was also expanded and lesions were diminished in pIRES-ragB'-mGITRL mice comparing with control groups. Our results clearly demonstrated that P. gingivalis B cell antigen epitope vaccine, pIRES-ragB'-mGITRL, could induce protective immune responses. Furthermore, our data also indicated that pIRES-ragB'-mGITRL was a potential therapeutic vaccine against P. gingivalis.
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Affiliation(s)
- F Kong
- Department of Stomatology, the Affiliated People's Hospital of Jiangsu University, Zhenjiang, China
| | - D Zheng
- Department of Stomatology, the Affiliated People's Hospital of Jiangsu University, Zhenjiang, China
| | - P She
- Department of Stomatology, the Affiliated People's Hospital of Jiangsu University, Zhenjiang, China
| | - P Ni
- Department of Immunology & Laboratory Immunology, Jiangsu University, Zhenjiang, China
| | - H Zhu
- Department of Immunology & Laboratory Immunology, Jiangsu University, Zhenjiang, China
| | - H Xu
- Department of Immunology & Laboratory Immunology, Jiangsu University, Zhenjiang, China
| | - Z Su
- Department of Immunology & Laboratory Immunology, Jiangsu University, Zhenjiang, China
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Xu X, Zhu H, Wang T, Sun Y, Ni P, Liu Y, Tian S, Amoah Barnie P, Shen H, Xu W, Xu H, Su Z. Exogenous High-Mobility Group Box 1 Inhibits Apoptosis and Promotes the Proliferation of Lewis Cells via RAGE/TLR4-Dependent Signal Pathways. Scand J Immunol 2014; 79:386-94. [PMID: 24673192 DOI: 10.1111/sji.12174] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Accepted: 03/25/2014] [Indexed: 01/16/2023]
Affiliation(s)
- X. Xu
- The Central Laboratory; The Fourth Affiliated Hospital of Jiangsu University; Zhenjiang China
- Department of Immunology & Laboratory Immunology; Jiangsu University; Zhenjiang China
| | - H. Zhu
- Department of Laboratory Medicine; The Affiliated Hospital of Jiangsu University; Zhenjiang China
| | - T. Wang
- The Central Laboratory; The Fourth Affiliated Hospital of Jiangsu University; Zhenjiang China
- Department of Immunology & Laboratory Immunology; Jiangsu University; Zhenjiang China
| | - Y. Sun
- The Central Laboratory; The Fourth Affiliated Hospital of Jiangsu University; Zhenjiang China
- Department of Immunology & Laboratory Immunology; Jiangsu University; Zhenjiang China
| | - P. Ni
- The Central Laboratory; The Fourth Affiliated Hospital of Jiangsu University; Zhenjiang China
- Department of Immunology & Laboratory Immunology; Jiangsu University; Zhenjiang China
| | - Y. Liu
- The Central Laboratory; The Fourth Affiliated Hospital of Jiangsu University; Zhenjiang China
| | - S. Tian
- The Central Laboratory; The Fourth Affiliated Hospital of Jiangsu University; Zhenjiang China
- Department of Immunology & Laboratory Immunology; Jiangsu University; Zhenjiang China
| | - P. Amoah Barnie
- The Central Laboratory; The Fourth Affiliated Hospital of Jiangsu University; Zhenjiang China
- Department of Immunology & Laboratory Immunology; Jiangsu University; Zhenjiang China
| | - H. Shen
- Department of Laboratory Medicine; The Affiliated People's Hospital of Jiangsu University; Zhenjiang China
| | - W. Xu
- The Central Laboratory; The Fourth Affiliated Hospital of Jiangsu University; Zhenjiang China
| | - H. Xu
- The Central Laboratory; The Fourth Affiliated Hospital of Jiangsu University; Zhenjiang China
- Department of Immunology & Laboratory Immunology; Jiangsu University; Zhenjiang China
| | - Z. Su
- The Central Laboratory; The Fourth Affiliated Hospital of Jiangsu University; Zhenjiang China
- Department of Immunology & Laboratory Immunology; Jiangsu University; Zhenjiang China
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Running WE, Ni P, Kao CC, Reilly JP. Chemical reactivity of brome mosaic virus capsid protein. J Mol Biol 2012; 423:79-95. [PMID: 22750573 DOI: 10.1016/j.jmb.2012.06.031] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 06/01/2012] [Accepted: 06/20/2012] [Indexed: 12/12/2022]
Abstract
Viral particles are biological machines that have evolved to package, protect, and deliver the viral genome into the host via regulated conformational changes of virions. We have developed a procedure to modify lysine residues with S-methylthioacetimidate across the pH range from 5.5 to 8.5. Lysine residues that are not completely modified are involved in tertiary or quaternary structural interactions, and their extent of modification can be quantified as a function of pH. This procedure was applied to the pH-dependent structural transitions of brome mosaic virus (BMV). As the reaction pH increases from 5.5 to 8.5, the average number of modified lysine residues in the BMV capsid protein increases from 6 to 12, correlating well with the known pH-dependent swelling behavior of BMV virions. The extent of reaction of each of the capsid protein's lysine residues has been quantified at eight pH values using coupled liquid chromatography-tandem mass spectrometry. Each lysine can be assigned to one of three structural classes identified by inspection of the BMV virion crystal structure. Several lysine residues display reactivity that indicates their involvement in dynamic interactions that are not obvious in the crystal structure. The influence of several capsid protein mutants on the pH-dependent structural transition of BMV has also been investigated. Mutant H75Q exhibits an altered swelling transition accompanying solution pH increases. The H75Q capsids show increased reactivity at lysine residues 64 and 130, residues distal from the dimer interface occupied by H75, across the entire pH range.
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Affiliation(s)
- W E Running
- Department of Chemistry, Indiana University, Bloomington, IN 47405, USA
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Guo X, Liu W, Pan Y, Ni P, Ji J, Guo L, Zhang J, Wu J, Jiang J, Chen X, Cai Q, Li J, Zhang J, Gu Q, Liu B, Zhu Z, Yu Y. Homeobox gene IRX1 is a tumor suppressor gene in gastric carcinoma. Oncogene 2010; 29:3908-20. [PMID: 20440264 DOI: 10.1038/onc.2010.143] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The IRX1 tumor suppressor gene is located on 5p15.33, a cancer susceptibility locus. Loss of heterozygosity of 5p15.33 in gastric cancer was identified in our previous work. In this study, we analyzed the molecular features and function of IRX1. We found that IRX1 expression was lost or reduced in gastric cancer. However, no mutations were identified in IRX1-encoding regions. IRX1 transcription was suppressed by hypermethylation, and the expression of IRX1 mRNA was partially restored in gastric cancer cells after 5-Aza-dC treatment. Restoring IRX1 expression in SGC-7901 and NCI-N87 gastric cancer cells inhibited growth, invasion and tumorigenesis in vitro and in vivo. We identified a number of target genes by global microarray analysis after IRX1 transfection combined with real-time PCR and chromatin immunoprecipitation assay. BDKRB2, an angiogenesis-related gene, HIST2H2BE and FGF7, cell proliferation and invasion-related genes, were identified as direct IRX1 target genes. The hypermethylation of IRX1 was not only detected in primary gastric cancer tissues but also in the peripheral blood of gastric cancer patients, suggesting IRX1 could potentially serve as a biomarker for gastric cancer.
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Affiliation(s)
- X Guo
- Department of Surgery of Shanghai Ruijin Hospital and Shanghai Institute of Digestive Surgery, Shanghai, PR China
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Valentine JF, Fedorak RN, Feagan B, Fredlund P, Schmitt R, Ni P, Humphries TJ. Steroid-sparing properties of sargramostim in patients with corticosteroid-dependent Crohn's disease: a randomised, double-blind, placebo-controlled, phase 2 study. Gut 2009; 58:1354-62. [PMID: 19505878 DOI: 10.1136/gut.2008.165738] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [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: 12/08/2022]
Abstract
OBJECTIVE Although treatment with corticosteroids induces remission in Crohn's disease, prolonged exposure to corticosteroids is undesirable. This randomised clinical trial evaluated the efficacy of recombinant human granulocyte-macrophage colony-stimulating factor (sargramostim), an activator of innate immunity, in corticosteroid-dependent patients with Crohn's disease. DESIGN Patients were randomised in a 2:1 ratio, to sargramostim 6 microg/kg subcutaneously once daily or placebo for up to 22 weeks. The study consisted of (1) an adjunctive phase (weeks 1-4) in which patients received study drug plus corticosteroid therapy; (2) a forced corticosteroid tapering phase (weeks 4-14); and (3) an observation phase (4 weeks) in which patients received study drug plus prednisone < or =7.5 mg. The primary endpoint was corticosteroid-free remission (Crohn's Disease Activity Index (CDAI) < or =150) 4 weeks after corticosteroid elimination. Secondary endpoints were corticosteroid-free response (CDAI decreased by > or =100) and induction of remission in patients who reduced the dose of corticosteroid to 2.5-7.5 mg. RESULTS Eighty-seven patients were randomised to sargramostim and 42 to placebo. Significantly more sargramostim-treated patients than placebo patients achieved corticosteroid-free remission (18.6% vs 4.9%; p = 0.03). Similar differences were seen for corticosteroid-free response and in patients who tapered corticosteroids to 2.5-7.5 mg/day. Sargramostim treatment was also associated with significant improvements in health-related quality of life. Patients who received sargramostim were more likely to experience musculoskeletal pain, injection site reactions and dyspnoea. CONCLUSIONS Sargramostim was more effective than placebo for inducing corticosteroid-free remission in patients with Crohn's disease with corticosteroid dependence. Sargramostim may provide significant benefit in this population if these findings are confirmed.
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Affiliation(s)
- J F Valentine
- Gastroenterology, Hepatology & Nutrition, University of Florida, 1600 SW Archer Rd, Rm HD 602, Gainesville, FL 32610, USA.
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Preston R, Norris P, Alonso A, Ni P, Hanes V, Karara A. PO22-719 NOVEL HORMONE THERAPY DROSPIRENONE-ESTRADIOL (DRSP/E2) LOWERS BLOOD PRESSURE AND REDUCES POTASSIUM LOSS IN HYPERTENSIVE POSTMENOPAUSAL WOMEN RECEIVING HYDROCHLOROTHIAZIDE (HCTZ). ATHEROSCLEROSIS SUPP 2007. [DOI: 10.1016/s1567-5688(07)71729-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Ulrich A, Adonin A, Jacoby J, Turtikov V, Fernengel D, Fertman A, Golubev A, Hoffmann DHH, Hug A, Krücken R, Kulish M, Menzel J, Morozov A, Ni P, Nikolaev DN, Shilkin NS, Ternovoi VY, Udrea S, Varentsov D, Wieser J. Excimer laser pumped by an intense, high-energy heavy-ion beam. Phys Rev Lett 2006; 97:153901. [PMID: 17155326 DOI: 10.1103/physrevlett.97.153901] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2006] [Indexed: 05/12/2023]
Abstract
High-energy heavy ions are an ideal tool to generate homogeneously excited, extended volumes of nonthermal plasmas. Here, the high-energy loss (dE/dx) and absolute power deposition of heavy ions interacting with matter has been used to pump an ultraviolet laser. A pulsed 70 MeV/u 238U beam with up to 2.5 x 10(9) particles in approximately 100 ns beam bunches was stopped in a 1.2 m long laser cell filled with a 1.6 bar Ar-Kr-F2 mixture (typically 50%:49.9%:0.1%). Laser effect on the 248 nm KrF* excimer transition is clearly demonstrated.
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Affiliation(s)
- A Ulrich
- Physik Department E12, Technische Universität München, James Franck Strasse 1. D-85748 Garching, Germany
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Udrea S, Shilkin N, Fortov VE, Hoffmann DHH, Jacoby J, Kulish MI, Mintsev V, Ni P, Nikolaev D, Tahir NA, Varentsov D. Electrical resistivity measurements of heavy ion beam generated high energy density aluminium. ACTA ACUST UNITED AC 2006. [DOI: 10.1088/0305-4470/39/17/s68] [Citation(s) in RCA: 10] [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: 11/11/2022]
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Tahir NA, Deutsch C, Fortov VE, Gryaznov V, Hoffmann DHH, Kulish M, Lomonosov IV, Mintsev V, Ni P, Nikolaev D, Piriz AR, Shilkin N, Spiller P, Shutov A, Temporal M, Ternovoi V, Udrea S, Varentsov D. Proposal for the study of thermophysical properties of high-energy-density matter using current and future heavy-ion accelerator facilities at GSI Darmstadt. Phys Rev Lett 2005; 95:035001. [PMID: 16090748 DOI: 10.1103/physrevlett.95.035001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2005] [Revised: 05/03/2005] [Indexed: 05/03/2023]
Abstract
The subject of high-energy-density (HED) states in matter is of considerable importance to numerous branches of basic as well as applied physics. Intense heavy-ion beams are an excellent tool to create large samples of HED matter in the laboratory with fairly uniform physical conditions. Gesellschaft für Schwerionenforschung, Darmstadt, is a unique worldwide laboratory that has a heavy-ion synchrotron, SIS18, that delivers intense beams of energetic heavy ions. Construction of a much more powerful synchrotron, SIS100, at the future international facility for antiprotons and ion research (FAIR) at Darmstadt will lead to an increase in beam intensity by 3 orders of magnitude compared to what is currently available. The purpose of this Letter is to investigate with the help of two-dimensional numerical simulations, the potential of the FAIR to carry out research in the field of HED states in matter.
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Affiliation(s)
- N A Tahir
- Gesellschaft für Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany
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Thring RW, Ni P, Aharoni SM. MOLECULAR WEIGHT EFFECTS OF THE SOFT SEGMENT ON THE ULTIMATE PROPERTIES OF LIGNIN-DERIVED POLYURETHANES. INT J POLYM MATER PO 2004. [DOI: 10.1080/00914030490267627] [Citation(s) in RCA: 23] [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: 10/26/2022]
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Ni P, Shen F, Meng W, Jiang F, Feng S. [Complex segregation analysis of systemic lupus erythematosus]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi 2001; 18:343-6. [PMID: 11592039] [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: 02/21/2023]
Abstract
OBJECTIVE To explore the genetic model of systemic lupus erythematosus(SLE). METHODS Complex segregation analysis was performed by using statistical analysis for genetic epidemiology-REGTL(SAGE-REGTL). The genetic model and gene frequency were estimated. 300 pedigrees with SLE were collected from 300 patients as probands. RESULTS The complex segregation analysis found the genetic model of SLE to be additive,the gene frequency 0.336. The authors believe the possibility of some different modes coexisting under different circumstances. The genetic effect on young man is stronger than that on old one. CONCLUSION This study suggests that the genetic mode of SLE could be the major gene trait, and additive mode is the best fitted one.
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Affiliation(s)
- P Ni
- Department of Maternal and Child Health, Shanghai Medical University, Shanghai, 200032 P.R. China.
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Guo X, Ni P, Li L. [Association between asthma and the polymorphism of HLA-DQ genes]. Zhonghua Jie He He Hu Xi Za Zhi 2001; 24:139-41. [PMID: 11802952] [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: 02/23/2023]
Abstract
OBJECTIVE To investigate association between asthma and HLA-DQ genes in Chinese asthma family. METHODS HLA genotyping was done for HLA-DQ using polymerase chain reaction-sequence specific primers (PCR-SSP) in 98 members of 32 Chinese asthma families and 67 normal controls. RESULTS The allele frequencies of DQA1 * 0101 and DQA1 * 0601 in asthmatics (40.0% and 45.0% respectively) were significantly higher than those in normal controls (16.4% and 13.4% respectively; chi(2) = 6.1860, P < 0.05, RR = 3.39 and chi(2) = 11.609 0, P < 0.01, RR = 5.27 respectively). The allele frequencies of DQB1 * 0303 and DQB1 * 0601 in asthmatics (55.0% and 47.5% respectively) were also significantly higher than those in normal controls (13.7% and 13.7% respectively; chi(2) = 15.740 0, P < 0.01, RR = 7.68 and chi(2) = 10.930 0, P < 0.01, RR = 5.69 respectively). The allele frequency of DQ * 0201 (39.4%) was significantly higher in members with positive specific IgE response to dermatophagoides than that in non-atopy members (12.0%) in asthma family (t = 2.382 5, P < 0.05). CONCLUSION HLA-DQA1* 0101, DQA1 * 0601 and HLA-DQB1 * 0303, DQB1 * 0601 may be the susceptible alleles of asthma. HLA-DQB1 * 0201 allele may limit the specific IgE response to dermatophagoides.
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Affiliation(s)
- X Guo
- Department of Respiratory Medicine, Ruijin Hospital, Shanghai Second Medical University, Shanghai 200025, China
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Ni P, Shen F, Meng W, Jiang F, Feng S. [The association and linkage analysis between the FcgammaR II a-131 and system lupus erythematosus]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi 2000; 17:409-12. [PMID: 11110978] [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: 02/18/2023]
Abstract
OBJECTIVE To shed light on the relationship between FcgammaR II a-131 and systemic lupus erythematosus(SLE) in southern Chinese Han population. METHODS A population-based and family-based study was carried out. FcgammaR II a-131 of each subject was measured by using PCR-allele specific oligonucleotide hybridization(ASO) method. RESULTS (1) The distribution of FcgammaR II A-131 genotype in cases is significantly different from that in controls (P<0.05). So is the frequency of FcgammaR II aR-131 allele (P < 0.01) which suggests that subjects who have R131 allele tend to be more susceptible to SLE. The subjects with R/R131 homozygous genotype have a higher risk of suffering from SLE. (2) The distribution of FcgammaR II a-131 varies in different races, with identical distribution type among Chinese and Japanese. (3) The results of family-based association analysis and transmitted/disequilibrium test(TDT) suggest that there is not any linkage evidence between FcgammaR II a-131 and SLE. Possibly, the sample size was too small to get positive result. CONCLUSION This study suggests that FcgammaR II a-131 is a major factor predisposing to the development of SLE in southern Chinese Han population.
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Affiliation(s)
- P Ni
- Department of Epidemiology, Shanghai Medical University, Shanghai, 200032 P.R.China
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Chu R, Ni P, Ni M, Shen F. Genetic epidemiology study of pathological myopia. Zhonghua Yi Xue Yi Chuan Xue Za Zhi 2000; 17:178-80. [PMID: 10837519] [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: 02/16/2023]
Abstract
OBJECTIVE To explore the genetic epidemiology of pathological myopia (PM), including hereditary and genetic model. METHODS The simple segregation analysis was done by SEGRANB. The values of segregation ratio p and the proportion of sporadic cases x were estimated. The complex segregation analysis was performed using SAGE-REGD. The genetic model and gene frequency were estimated. The 62 pedigrees with PM were random samples from hospital patients. RESULTS By simple segregation analysis, the genetic pattern of N*N is autosomal recessive and the frequency of sporadic cases is approximately 65.72%. The genetic pattern of A*N may be autosomal recessive (but autosomal dominant cannot be excluded), the frequency of sporadic cases is approximately 35.14%. By complex segregation analysis, the genetic model of PM is autosomal recessive and the gene frequency is 0.147385. CONCLUSION PM is compatible with autosomal recessive inheritance (autosomal dominant not excluded ), the sporadic cases are existent and the gene frequency is 0.147385.
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Affiliation(s)
- R Chu
- Department of Ophthalmology, E & ENT Hospital, Shanghai Medical University, Shanghai, 200031 P. R. China.
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Pensky M, Ni P. Extended linear empirical bayes estimation. COMMUN STAT-THEOR M 2000. [DOI: 10.1080/03610920008832503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Guo X, Ni P, Li L. [Studies of microsatellite instability and loss of heterozygosity at chromosome 17 in non-small cell lung carcinoma]. Zhonghua Jie He He Hu Xi Za Zhi 1999; 22:743-5. [PMID: 11776784] [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: 02/23/2023]
Abstract
OBJECTIVE To identify the presence of microsatellite instability (MI) and loss of heterozygosity (LOH) in non-small cell lung carcinoma (NSCLC). METHODS Four microsatellite markers TP53(17p13.1), THRA1 (17q11.2-12), D17S579(17q12-21) and D17S855(17q21) were used to examine 35 cases of NSCLC tumor-normal paired tissues for MI and LOH at chromosome 17 using PCR based analysis. RESULTS 22 of 35 tumors(63%) displayed MI or LOH. 14 tumors(40%) exhibited MI, 11 tumors(31%) exhibited LOH, while 3 tumors (9%) exhibited MI and LOH concurrently. The frequency of MI or LOH was obviously higher in the early-stage(stages I and II, 79%) than in the advanced-stage (stage III, 44%), P < 0.05. However, the frequency of MI or LOH had no significant difference between high-grade differentiated NSCLC tumors and low-grade ones, P > 0.05. No relationship was observed between the presence of MI or LOH and the histologic subtype of NSCLC, P > 0.05. CONCLUSIONS The results suggest that MI and LOH at chromosome 17 may play a significant role in the development of NSCLC. The high frequency of MI or LOH in the early-stage tumors indicates that these genetic alterations could occur early during NSCLC development.
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Affiliation(s)
- X Guo
- Department of Respiratory Medicine, Ruijin Hospital, Shanghai Second Medical University, Shanghai 200025
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Abstract
Oil containing microcapsules were prepared by using phthaloyl dichloride as an oil-soluble monomer and diethylene triamine (DETA) as a water-soluble monomer. The diameter of the microcapsules decreased and their distribution became narrower and sharper as the emulsifying time was increased within the initial period of 45 s, beyond which no appreciable changes in the diameter and its distribution were observed. Once DETA was introduced into the aqueous solution to initiate the interfacial polycondensation reaction, reducing the stirring speed diminished the formation of the membrane fragments, but resulted in an increase in the microcapsule diameter. This indicates that the strength of the initial membrane is not strong enough to prevent the microcapsules from coalescing. Raising the volume fraction of the dispersed phase led to a larger diameter and a wider distribution of the microcapsules. When ortho-, meta- or para-phthaloyl dichloride was used as the oil-soluble monomer, both the diameter and the zeta-potential of the microcapsules decreased in the order: ortho-->meta-->para-, indicating that the steric effect of the monomers plays an important role in the microencapsulation process.
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Affiliation(s)
- M Zhang
- Department of Chemical Engineering, Suzhou University, P.R. China
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Abstract
Oily liquids were microencapsulated within polyphthalamide membranes with dodecyl sulphonate sodium (DSS) as an emulsifier. The mean diameter and the distribution, as well as the zeta-potential, of the microcapsules were analysed. It was found that the mean diameter decreases with an increase in stirring speed and emulsifier concentration during the emulsification step. The addition of DSS to aqueous phase resulted in a decrease in zeta-potential of the microcapsules.
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Affiliation(s)
- N Yan
- Department of Chemical Engineering, Suzhou University, PR China
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Abstract
Polyurea microcapsules containing oily substances were prepared by using cyanate and polyamine as the monomers with non-ionic surfactant as the emulsifiers. Results showed that TDI-DETA microcapsules had the best stability. The mean diameter decreased and the size distribution curves became narrower and sharper as the stirring speed and the emulsifier concentration during emulsification increased. Addition of Tween 80 to aqueous solution containing OP led to an increase in microcapsule diameter and wider distribution of microcapsules due to the changes in interfacial tension. The isoelectric point of the polyurea microcapsules was found to be pH 5.8.
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Affiliation(s)
- N Yan
- Department of Chemical Engineering, Suzhou University, PR China
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Yan N, Zhang M, Ni P. A study of the stability of W/O/W multiple emulsions. J Microencapsul 1992; 9:143-51. [PMID: 1593397] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The stability of W/O/W emulsions has been studied in batch agitators. The surfactants suitable for W/O/W emulsions were screened and the factors affecting the emulsion stability were also studied. Results showed that polyamine E644 was an excellent emulsifier for W/O emulsions since the emulsion stabilized by it has not only good stability but also shows smaller swelling. The stability of the emulsion increases with increase in membrane viscosity and concentration of surfactant, but decreases with increase in concentration of the internal reagent in the internal phase and the carriers in the membrane. Raising the agitation speed and the time for preparing the W/O emulsion is beneficial to membrane stability due to formation of smaller internal droplets, but raising the speed for dispersing the W/O emulsion in the external phase results in an increase in membrane breakage.
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Affiliation(s)
- N Yan
- Department of Chemical Engineering, Suzhou University, China
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Ni P, Guyon F, Caude M, Rosset R. Automatic Determination of Clomipramine, Imipramine and Their Demethylated Metabolites in Plasma by High Performance Liquid Chromatography. ACTA ACUST UNITED AC 1988. [DOI: 10.1080/01483918808068366] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Ni P, Guyon F, Caude M, Rosset R. Automatic determination of urinary 4-hydroxy-3-methoxymandelic (vanillylmandelic) acid by liquid chromatography with electrochemical detection. J Chromatogr 1988; 424:255-62. [PMID: 3372620 DOI: 10.1016/s0378-4347(00)81102-0] [Citation(s) in RCA: 4] [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: 01/05/2023]
Abstract
An automated liquid chromatographic method for the determination of urinary concentrations of 4-hydroxy-3-methoxymandelic acid (VMA) is described. Urine samples are purified by solid-phase extraction on an anion-exchange cartridge and automated on-line chromatographic elution is carried out using a Varian AASP (advanced automated sample processor) system. The column effluent is monitored with an electrochemical detector using a glassy carbon working electrode. The method allows the determination of VMA in 0.05 ml of normal urine with a relative standard deviation of less than 3%. The analysis time can be shortened by use of back-flushing technique, and the correlation with a classical (but non-automated) VMA analysis method is excellent.
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Affiliation(s)
- P Ni
- Laboratoire de Chimie Analytique de l'Ecole Supérieure de Physique, Paris, France
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