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1. An Automatic Irrigation Control System for Soilless Culture of Lettuce

Author:
Liu, Zhigang,   et al.   ; Xu, Qinchao;     Show all 2 Author
Source:
Water 2018 v.10 no.11
ISSN:
2073-4441
Subject:
computer software; developmental stages; drainage; evapotranspiration; irrigation management; irrigation water; lettuce; models; rhizosphere; soilless culture; spring; summer; water conservation; water content; water use efficiency
Abstract:
... To achieve precise measurement of moisture content in the substrate and intelligent water-saving irrigation, a simple and low cost automatic irrigation control system based on ZigBee wireless network has been developed. A software with irrigation strategy was proposed based on the models of substrate wetting pattern, lettuce root zone and the evapotranspiration. The system could detect substrate m ...
DOI:
10.3390/w10111692

2. Precision Irrigation Scheduling Using ECH<sub>2</sub>O Moisture Sensors for Lettuce Cultivated in a Soilless Substrate Culture

Author:
Liu, Zhigang,   et al.   ; Xu, Qinchao;     Show all 2 Author
Source:
Water 2018 v.10 no.5
ISSN:
2073-4441
Subject:
Lactuca sativa; continuous cropping; crop production; horticulture; irrigation scheduling; isomerases; lettuce; microirrigation; models; rhizosphere; soilless culture; water holding capacity
Abstract:
... Soilless culture has become an effective technique to avoid continuous cropping obstacles in protected horticulture. The reliable measurement of substrate moisture and a rational irrigation are difficult tasks because of the low water-holding capacity of the substrate. Our objectives were to study the irrigation scheduling based on the ECH2O moisture sensor(EC-5), using a matched model ...
DOI:
10.3390/w10050549

3. Effects of pipe material on nitrogen transformation, microbial communities and functional genes in raw water transportation

Author:
Liu, Zhigang,   et al.   ; Xu, Hang; Lin, Chenshuo; Chen, Wei; Shen, Zhen; Chen, Taoyuan; Wang, Yueting; Li, Yang; Lu, Chunhui; Luo, Jian;     Show all 10 Authors
Source:
Water research 2018 v.143 pp. 188-197
ISSN:
0043-1354
Subject:
dissolved organic nitrogen; ammonia; water supply; genes; ammonium nitrogen; nitrite nitrogen; steel; nitrogen fixation; nitrate nitrogen; synergism; sequence analysis; basins; microbial communities; pipelines; pipes; models; nitrification; pollutants; drinking water; denitrification; quantitative polymerase chain reaction; path analysis; microorganisms; water treatment; China
Abstract:
... Raw water transportation pipelines are vital in an urban water supply system for transporting raw water to drinking water treatment plants. This study investigated the effects of pipe material on nitrogen transformation, microbial communities and characteristics of related function genes in paint-lined steel pipe (PLSP) and cement-lined steel pipe (CLSP) raw water model systems. We established qua ...
DOI:
10.1016/j.watres.2018.06.040

4. Technical and economic feasibility of the Isopropanol-Acetone-Hydrogen chemical heat pump based on a lab-scale prototype

Author:
Liu, Zhigang,   et al.   ; Xu, Min; Cai, Jun; Guo, Jiangfeng; Huai, Xiulan; Zhang, Hang;     Show all 6 Authors
Source:
Energy 2017 v.139 pp. 1030-1039
ISSN:
0360-5442
Subject:
distillation; economic feasibility; exergy; heat; heat pumps; models; temperature; wastes
Abstract:
... Chemical heat pump are promising alternatives in waste heat recovery applications. The present paper focuses on the technical and economic feasibility analysis of the Isopropanol-Acetone-Hydrogen Chemical Heat Pump (IAH-CHP) system. A small scale prototype of the IAH-CHP was established. Coefficient of performance (COP), exergy efficiency and entransy efficiency analysis were adopted to evaluate t ...
DOI:
10.1016/j.energy.2017.08.043

5. Sesamol ameliorates diet‐induced obesity in C57BL/6J mice and suppresses adipogenesis in 3T3‐L1 cells via regulating mitochondria‐lipid metabolism

Author:
Liu, Zhigang,   et al.   ; Qiao, Qinglian; Sun, Yali; Chen, Yuwei; Ren, Bo; Liu, Xuebo;     Show all 6 Authors
Source:
Molecular nutrition & food research 2017 v.61 no.8
ISSN:
1613-4125
Subject:
Western diets; adipocytes; adipogenesis; adiposity; antimycin A; antioxidants; blood serum; cholesterol metabolism; drinking water; fructose; insulin resistance; lipogenesis; liver; metabolic inhibitors; mice; mitochondria; models; obesity; oligomycin; sesame oil; triacylglycerols
Abstract:
... SCOPE: The aim of the current study was to investigate the effect of sesamol, a natural powerful antioxidant and anti‐inflammatory phenol derivative of sesame oil, on adiposity and adiposity‐related metabolic disturbances in mice fed with western diet, and the potential underlying mechanisms focusing on the mitochondria‐lipid metabolism. METHODS AND RESULTS: In the experimental model that consiste ...
DOI:
10.1002/mnfr.201600717

6. Chicoric acid supplementation ameliorates cognitive impairment induced by oxidative stress via promotion of antioxidant defense system

Author:
Liu, Zhigang,   et al.   ; Wang, Yutang; Diao, Zhijun; Li, Jing; Ren, Bo; Zhu, Di; Liu, Qian; Liu, Xuebo;     Show all 8 Authors
Source:
RSC advances 2017 v.7 no.57 pp. 36149-36162
ISSN:
2046-2069
Subject:
acid treatment; antioxidant activity; antiretroviral agents; apoptosis; blood serum; body weight; chicory; cognition; cognitive disorders; enzymes; galactose; hippocampus; histology; hydrogen peroxide; inflammation; interleukin-1beta; intraperitoneal injection; malondialdehyde; memory; mice; mitochondria; models; neurons; nutrient content; oxidative stress; protective effect; signal transduction; tumor necrosis factor-alpha
Abstract:
... Chicoric acid, a nutritional component found in the Mediterranean vegetable chicory, possesses multiple biological properties including antioxidant activities, anti-obesity effects, anti-HIV, and others. However, there have been very few studies of its effects to counter oxidative stress-induced cognitive loss. To address this, the goal of this study was to investigate the effects of chicoric acid ...
DOI:
10.1039/c7ra06325c

7. Variation of microbial communities and functional genes during the biofilm formation in raw water distribution systems and associated effects on the transformation of nitrogen pollutants

Author:
Liu, Zhigang,   et al.   ; Chen, Wei; Gu, Yanmei; Xu, Hang; Lu, Chunhui; Lin, Chenshuo;     Show all 6 Authors
Source:
Environmental science and pollution research international 2017 v.24 no.18 pp. 15347-15359
ISSN:
0944-1344
Subject:
nitrite nitrogen; dissolved organic nitrogen; biofilm; microbial communities; pipes; models; nitrate nitrogen; nitrification; pollutants; water treatment; genes; Nitrospirae; ammonium nitrogen; biomass; Bacteroidetes; water distribution
Abstract:
... This study aimed to investigate the variation of microbial communities and functional genes during the biofilm formation in raw water distribution systems without prechlorination and associated effects on the transformation of nitrogen pollutants by using a designed model pipe system. The results showed the transformation of nitrogen pollutants was obvious during the biofilm formation. The richnes ...
DOI:
10.1007/s11356-017-9125-z

8. Intrinsic Reduction Kinetics Investigation on a Hematite Oxygen Carrier by CO in Chemical Looping Combustion

Author:
Liu, Zhigang,   et al.   ; Su, Mingze; Zhao, Haibo; Tian, Xin; Zhang, Pengfei; Du, Baozhou;     Show all 6 Authors
Source:
Energy & Fuels 2017 v.31 no.3 pp. 3010-3018
ISSN:
1520-5029
Subject:
activation energy; combustion; fluid mechanics; hematite; models; oxygen; temperature; thermogravimetry; weight loss
Abstract:
... In the present work, the intrinsic reduction kinetics of a chemical looping oxygen carrier, hematite, reduced by CO has been investigated. Initially, the pore structure features of the hematite OC were tested to provide the necessary parameters for the kinetics analysis. Then, temperature-programmed reduction experiments were conducted in a thermogravimetric analyzer. The results showed that the w ...
DOI:
10.1021/acs.energyfuels.6b02827

9. Supplementation of lycopene attenuates oxidative stress induced neuroinflammation and cognitive impairment via Nrf2/NF-κB transcriptional pathway

Author:
Liu, Zhigang,   et al.   ; Zhao, Beita; Ren, Bo; Guo, Rui; Zhang, Wentong; Ma, Shaobo; Yao, Yuchen; Yuan, Tian; Liu, Xuebo;     Show all 9 Authors
Source:
Food and chemical toxicology 2017 v.109 pp. 505-516
ISSN:
0278-6915
Subject:
antioxidants; blood serum; body weight; cognition; enzymes; galactose; hippocampus; histopathology; immunohistochemistry; interleukin-1beta; locomotion; lycopene; males; memory disorders; messenger RNA; mice; models; neuroglia; neurons; neuroprotective effect; oxidative stress; toxicology; transcription (genetics); transcription factor NF-kappa B; tumor necrosis factor-alpha
Abstract:
... Oxidative stress, considered as a major culprit in brain aging, triggers cognitive and memory impairment. Lycopene (LYC), a carotenoid pigment, possesses potent antioxidative, anti-inflammatory, and neuroprotective properties. In the present study, the effects of LYC on oxidative stress-induced cognitive defects and the underlying mechanisms were determined. The behavioral tests, including Y-maze ...
DOI:
10.1016/j.fct.2017.09.050

10. Cichoric Acid Reverses Insulin Resistance and Suppresses Inflammatory Responses in the Glucosamine-Induced HepG2 Cells

Author:
Liu, Zhigang,   et al.   ; Zhu, Di; Wang, Yutang; Du, Qingwei; Liu, Xuebo;     Show all 5 Authors
Source:
Journal of agricultural and food chemistry 2015 v.63 no.51 pp. 10903-10913
ISSN:
0021-8561
Subject:
Echinacea purpurea; anti-inflammatory activity; antioxidants; basil; caffeic acid; chicory; functional foods; glucosamine; glucose; glucose transporters; human cell lines; inducible nitric oxide synthase; inflammation; insulin resistance; interleukin-6; messenger RNA; mitogen-activated protein kinase; models; oxygen; signal transduction; transcription factor NF-kappa B; tumor necrosis factor-alpha
Abstract:
... Cichoric acid, a caffeic acid derivative found in Echinacea purpurea, basil, and chicory, has been reported to have bioactive effects, such as anti-inflammatory, antioxidant, and preventing insulin resistance. In this study, to explore the effects of CA on regulating insulin resistance and chronic inflammatory responses, the insulin resistance model was constructed by glucosamine in HepG2 cells. C ...
DOI:
10.1021/acs.jafc.5b04533

11. Combined effects of water temperature and copper ion concentration on catalase activity in Crassostrea ariakensis

Author:
Liu, Zhigang,   et al.   ; Wang, Hui; Yang, Hongshuai; Liu, Jiahui; Li, Yanhong;     Show all 5 Authors
Source:
Chinese journal of oceanology and limnology 2015 v.33 no.4 pp. 905-912
ISSN:
0254-4059
Subject:
Crassostrea ariakensis; active oxygen species; antioxidant activity; biomarkers; catalase; copper; enzyme activity; equations; experimental design; metabolism; models; pollution; prediction; response surface methodology; synergism; water temperature
Abstract:
... A central composite experimental design and response surface method were used to investigate the combined effects of water temperature (18–34°C) and copper ion concentration (0.1–1.5 mg/L) on the catalase (CAT) activity in the digestive gland of Crassostrea ariakensis. The results showed that the linear effects of temperature were significant (P<0.01), the quadratic effects of temperature were sig ...
DOI:
10.1007/s00343-015-4212-9

12. Wetting patterns and water distributions in cultivation media under drip irrigation

Author:
Liu, Zhigang,   et al.   ; Li, Pingping; Hu, Yongguang; Wang, Jizhang;     Show all 4 Authors
Source:
Computers and electronics in agriculture 2015 v.112 pp. 200-208
ISSN:
0168-1699
Subject:
irrigation rates; microirrigation; migratory behavior; models; water content; water distribution; wetting front
Abstract:
... The infiltration and distribution of water in two kinds of cultivation media are examined under different conditions of drip irrigation in terms of flow, volume, and initial medium water content and the models were used to express the horizontal migration distance and the vertical migration distance, and express the size of the wetting body indirectly. The results show that in different media, the ...
DOI:
10.1016/j.compag.2015.01.003

13. Smashing Tissue Extraction of Five Lignans From the Fruit of Schisandra chinensis

Author:
Liu, Zhigang,   et al.   ; Cheng, Zhenyu; Song, Haiyan; Yang, Yingjie; Zhou, Hongli; Liu, Yan;     Show all 6 Authors
Source:
Journal of chromatographic science 2016 v.54 no.2 pp. 246-256
ISSN:
1945-239X
Subject:
Schisandra chinensis; bioactive compounds; chromatography; ethanol; experimental design; fruits; heat; herbal medicines; lignans; microwave treatment; models; particle size; response surface methodology; sedatives; solvents; China; Japan; Korean Peninsula
Abstract:
... Schisandra chinensis is one of the most famous herbal medicines in China, Korea and Japan. It has been widely used as a tonic, sedative, anti-aging and astringent agent. Lignans are one of its main bioactive components. The classical methods for extracting lignans, however, were tedious and energy-consuming. With the aim to develop an effective extraction method of lignans, the smashing tissue ext ...
DOI:
10.1093/chromsci/bmv116

14. Synthetic dendrimeric peptide active against biofilm and persister cells of Pseudomonas aeruginosa

Author:
Liu, Zhigang,   et al.   ; Bahar, Ali Adem; Totsingan, Filbert; Buitrago, Carlos; Kallenbach, Neville; Ren, Dacheng;     Show all 6 Authors
Source:
Applied microbiology and biotechnology 2015 v.99 no.19 pp. 8125-8135
ISSN:
0175-7598
Subject:
Pseudomonas aeruginosa; anti-infective properties; arginine; biofilm; carbenicillin; ciprofloxacin; coculture; dose response; epithelial cells; erythrocytes; hemolysis; humans; models; mutants; peptides; sheep; synergism; tobramycin; toxicity; tryptophan
Abstract:
... Antimicrobial dendrimeric peptides (AMDP) are a relatively new class of agents displaying repetitive functional groups on a branched core. Previously, we have investigated the length requirement for antimicrobial activity of peptides consisting of repeated arginine (R) and tryptophan (W) side chains and found that even short linear RW repeats are active, providing a starting point for a de novo de ...
DOI:
10.1007/s00253-015-6645-7

15. Optimization of microwave-assisted enzymatic extraction of polysaccharides from the fruit of Schisandra chinensis Baill

Author:
Liu, Zhigang,   et al.   ; Cheng, Zhenyu; Song, Haiyan; Yang, Yingjie; Liu, Yan; Hu, Haobin; Zhang, Yang;     Show all 7 Authors
Source:
International journal of biological macromolecules 2015 v.76 pp. 161-168
ISSN:
0141-8130
Subject:
Schisandra chinensis; endo-1,4-beta-glucanase; microwave radiation; microwave treatment; models; pH; papain; polygalacturonase; polysaccharides; response surface methodology; temperature
Abstract:
... A microwave-assisted enzymatic extraction (MAEE) method had been developed, which was optimized by response surface methodology (RSM) and orthogonal test design, to enhance the extraction of crude polysaccharides (CPS) from the fruit of Schisandra chinensis Baill. The optimum conditions were as follows: microwave irradiation time of 10min, extraction pH of 4.21, extraction temperature of 47.58°C, ...
DOI:
10.1016/j.ijbiomac.2015.01.048

16. The alimentary canal of Blomia tropicalis (Acari: Astigmata: Echymopodidae): the application of three-dimensional reconstruction technology

Author:
Liu, Zhigang,   et al.   ; Wu, Jie; Yang, Fengwei; Wu, Guihua; Ran, Pixin;     Show all 5 Authors
Source:
Experimental & applied acarology 2009 v.47 no.3 pp. 215-224
ISSN:
0168-8162
Subject:
Astigmata; asthma; cecum; colon; digestion; digestive tract; epithelial cells; epithelium; esophagus; foods; foregut; hindgut; microvilli; midgut; mites; models; pharynx; subtropics; vacuoles
Abstract:
... The domestic mite species Blomia tropicalis is an important indoor allergen source related to asthma and other allergic diseases in tropical and subtropical regions. Here, we describe the alimentary canal of B. tropicalis with the particular application of three-dimensional reconstruction technology. The alimentary canal of B. tropicalis resembles the typical acarid form consisting of the cuticle- ...
DOI:
10.1007/s10493-008-9208-0
PubMed:
19015940

17. Design, synthesis and evaluation of a potent substrate analog inhibitor identified by scanning Ala/Phe mutagenesis, mimicking substrate co-evolution, against multidrug-resistant HIV-1 protease

Author:
Liu, Zhigang,   et al.   ; Yedidi, Ravikiran S.; Muhuhi, Joseck M.; Bencze, Krisztina Z.; Koupparis, Kyriacos; O’Connor, Carrie E.; Kovari, Iulia A.; Spaller, Mark R.; Kovari, Ladislau C.;     Show all 9 Authors
Source:
Biochemical and biophysical research communications 2013 v.438 pp. 703-708
ISSN:
0006-291X
Subject:
Human immunodeficiency virus 1; active sites; calorimetry; coevolution; inhibitory concentration 50; lead; models; multiple drug resistance; mutagenesis; nuclear magnetic resonance spectroscopy; peptides; proteinase inhibitors; proteinases; titration
Abstract:
... Multidrug-resistant (MDR) clinical isolate-769, human immunodeficiency virus type-1 (HIV-1) protease (PDB ID: 1TW7), was shown to exhibit wide-open flaps and an expanded active site cavity, causing loss of contacts with protease inhibitors. In the current study, the expanded active site cavity of MDR769 HIV-1 protease was screened with a series of peptide-inhibitors that were designed to mimic the ...
DOI:
10.1016/j.bbrc.2013.07.117
PubMed:
23921229
PubMed Central:
PMC4288442

18. Crystal structures of multidrug-resistant HIV-1 protease in complex with two potent anti-malarial compounds

Author:
Liu, Zhigang,   et al.   ; Yedidi, Ravikiran S.; Wang, Yong; Brunzelle, Joseph S.; Kovari, Iulia A.; Woster, Patrick M.; Kovari, Ladislau C.; Gupta, Deepak;     Show all 8 Authors
Source:
Biochemical and biophysical research communications 2012 v.421 no.3 pp. 413-417
ISSN:
0006-291X
Subject:
Human immunodeficiency virus 1; active sites; antimalarials; aspartic proteinases; binding capacity; crystal structure; enzyme inhibition; hydrogen bonding; models; multiple drug resistance
Abstract:
... Two potent inhibitors (compounds 1 and 2) of malarial aspartyl protease, plasmepsin-II, were evaluated against wild type (NL4-3) and multidrug-resistant clinical isolate 769 (MDR) variants of human immunodeficiency virus type-1 (HIV-1) aspartyl protease. Enzyme inhibition assays showed that both 1 and 2 have better potency against NL4-3 than against MDR protease. Crystal structures of MDR protease ...
DOI:
10.1016/j.bbrc.2012.03.096
PubMed:
22469467
PubMed Central:
PMC3351498