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IET Systems Biology

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https://read.qxmd.com/read/30774115/control-of-depth-of-anaesthesia-using-fractional-order-adaptive-high-gain-controller
#1
Maryam Boroujerdi Alavi, Mohammad Tabatabaei
This study presents a fractional-order adaptive high-gain controller for control of depth of anaesthesia. To determine the depth of anaesthesia, the bispectral index (BIS) is utilised. To attain the desired BIS, the propofol infusion rate (as the control signal) should be appropriately adjusted. The effect of the propofol on the human body is modelled with the pharmacokinetic-pharmacodynamic (PK/PD) model. Physical properties of the patient such as gender, age, height and a like determine the parameters of the PK/PD model...
February 2019: IET Systems Biology
https://read.qxmd.com/read/30774114/switching-control-strategy-for-the-hiv-dynamic-system-with-some-unknown-parameters
#2
Yi Ding, Wen-June Wang
In human immunodeficiency virus (HIV) infection, many factors may influence the counts of healthy cells, immune cells and viruses. Drug treatment design for the HIV dynamic system is a valuable subject to be studied. This study considers an HIV dynamic system model with some unknown parameters and unmeasurable CD8 + T cell count and proposes a switching control strategy to force all states of the system to achieve a healthy status. It is a switching form with two different drug therapies and is designed based on the Lyapunov function theory such that the states of the HIV system approach the health equilibrium asymptotically without the influence of unknown parameters and unmeasurable cell counts...
February 2019: IET Systems Biology
https://read.qxmd.com/read/30774113/prediction-of-drug-synergy-score-using-ensemble-based-differential-evolution
#3
Harpreet Singh, Prashant Singh Rana, Urvinder Singh
Prediction of drug synergy score is an ill-posed problem. It plays an efficient role in the medical field for inhibiting specific cancer agents. An efficient regression-based machine learning technique has an ability to minimise the drug synergy prediction errors. Therefore, in this study, an efficient machine learning technique for drug synergy prediction technique is designed by using ensemble based differential evolution (DE) for optimising the support vector machine (SVM). Because the tuning of the attributes of SVM kernel regulates the prediction precision...
February 2019: IET Systems Biology
https://read.qxmd.com/read/30774112/efficient-anticorrelated-variance-reduction-for-stochastic-simulation-of-biochemical-reactions
#4
Vo Hong Thanh
We investigate the computational challenge of improving the accuracy of the stochastic simulation estimation by inducing negative correlation through the anticorrelated variance reduction technique. A direct application of the technique to the stochastic simulation algorithm (SSA), employing the inverse transformation, is not efficient for simulating large networks because its computational cost is similar to the sum of independent simulation runs. We propose in this study a new algorithm that employs the propensity bounds of reactions, introduced recently in their rejection-based SSA, to correlate and synchronise the trajectories during the simulation...
February 2019: IET Systems Biology
https://read.qxmd.com/read/30774111/parameter-estimation-of-a-meal-glucose-insulin-model-for-tidm-patients-from-therapy-historical-data
#5
Oscar D Sánchez, Eduardo Ruiz-Velázquez, Alma Y Alanís, Griselda Quiroz, Luis Torres-Treviño
The effect of meal on blood glucose concentration is a key issue in diabetes mellitus because its estimation could be very useful in therapy decisions. In the case of type 1 diabetes mellitus (T1DM), the therapy based on automatic insulin delivery requires a closed-loop control system to maintain euglycaemia even in the postprandial state. Thus, the mathematical modelling of glucose metabolism is relevant to predict the metabolic state of a patient. Moreover, the eating habits are characteristic of each person, so it is of interest that the mathematical models of meal intake allow to personalise the glycaemic state of the patient using therapy historical data, that is, daily measurements of glucose and records of carbohydrate intake and insulin supply...
February 2019: IET Systems Biology
https://read.qxmd.com/read/30774110/fuzzy-controller-design-for-breast-cancer-treatment-based-on-fractal-dimension-using-breast-thermograms
#6
Maryam Arab Zade, Hamed Khodadadi
In this study, three non-linear indices consist of compression, one-dimensional (1D) and two-dimensional (2D) fractal dimensions are used for the determination of the malignancy or benignity of cancer tumours in breast thermograms. On the other hand, by developing the high-precision infrared cameras as well as new methods of image processing, biomedical thermography images have found a prominent position among the others. Furthermore, cancerous tissue can be affected by the laser. In this study, in order to treat the cancerous lesion identified by breast thermograms, the laser parameters are designed...
February 2019: IET Systems Biology
https://read.qxmd.com/read/30472695/modelling-and-simulation-of-chlorophyll-fluorescence-from-photosystem-ii-as-affected-by-temperature
#7
Qian Xia, Jinglu Tan, Xunsheng Ji, Yongnian Jiang, Ya Guo
Emission of chlorophyll fluorescence (ChlF) from photosystem II (PSII) is affected by both plant status and environmental conditions. In this work, a state space model structure for ChlF from PSII with temperature as a variable model parameter was developed to provide insights into the temperature effects on photosynthesis and greenhouse temperature control. Experiments were carried out at 20, 25, and 30°C to validate the capability and flexibility of the developed model structure. Simulations of ChlF emission were performed for different temperatures...
December 2018: IET Systems Biology
https://read.qxmd.com/read/30472694/hierarchical-parameter-estimation-of-grn-based-on-topological-analysis
#8
Wei Zhang, Feng Zhang, Jianming Zhang, Ning Wang
Reverse engineering of gene regulatory network (GRN) is an important and challenging task in systems biology. Existing parameter estimation approaches that compute model parameters with the same importance are usually computationally expensive or infeasible, especially in dealing with complex biological networks.In order to improve the efficiency of computational modeling, the paper applies a hierarchical estimation methodology in computational modeling of GRN based on topological analysis. This paper divides nodes in a network into various priority levels using the graph-based measure and genetic algorithm...
December 2018: IET Systems Biology
https://read.qxmd.com/read/30472693/modelling-and-simulation-of-photosystem-ii-chlorophyll-fluorescence-transition-from-dark-adapted-state-to-light-adapted-state
#9
Shaopeng Feng, Lijiang Fu, Qian Xia, Jinglu Tan, Yongnian Jiang, Ya Guo
Green houses play a vital role in modern agriculture. Artificial light illumination is very important in a green house. While light is necessary for plant growth, excessive light in a green house may not bring more profit and even damages plants. Developing a plant-physiology-based light control strategy in a green house is important, which implies that a state-space model on photosynthetic activities is very useful because modern control theories and techniques are usually developed according to model structures in the state space...
December 2018: IET Systems Biology
https://read.qxmd.com/read/30472692/study-of-cohabitation-and-interconnection-effects-on-normal-and-leukaemic-stem-cells-dynamics-in-acute-myeloid-leukaemia
#10
Abdelhafid Zenati, Messaoud Chakir, Mohamed Tadjine
On the basis of recent studies, understanding the intimate relationship between normal and leukaemic stem cells is very important in leukaemia treatment. The authors' aim in this work is to clarify and assess the effect of coexistence and interconnection phenomenon on the healthy and cancerous stem cell dynamics. To this end, they perform the analysis of two time-delayed stem cell models in acute myeloid leukaemia. The first model is based on decoupled healthy and cancerous stem cell populations (i.e. there is no interaction between cell dynamics) and the second model includes interconnection between both population's dynamics...
December 2018: IET Systems Biology
https://read.qxmd.com/read/30472691/identifying-cancer-related-micrornas-based-on-subpathways
#11
Wenbin Liu, Zhendong Cui, Xiangzhen Zan
MicroRNAs (miRNAs) are a class of small endogenous non-coding genes that play important roles in post-transcriptional regulation as well as other important biological processes. Accumulating evidence indicated that miRNAs were extensively involved in the pathology of cancer. However, determining which miRNAs are related to a specific cancer is problematic because one miRNA may target multiple genes and one gene may be targeted by multiple miRNAs. The authors proposed a new approach, named miR_SubPath, to identify cancer-associated miRNAs by three steps...
December 2018: IET Systems Biology
https://read.qxmd.com/read/30472690/time-invariant-biological-networks-with-feedback-loops-structural-equation-models-and-structural-identifiability
#12
Yulin Wang, Yu Luo, Mingwen Wang, Hongyu Miao
Quantitative analyses of biological networks such as key biological parameter estimation necessarily call for the use of graphical models. While biological networks with feedback loops are common in reality, the development of graphical model methods and tools that are capable of dealing with feedback loops is still in its infancy. Particularly, inadequate attention has been paid to the parameter identifiability problem for biological networks with feedback loops such that unreliable or even misleading parameter estimates may be obtained...
December 2018: IET Systems Biology
https://read.qxmd.com/read/30472689/cancers-classification-based-on-deep-neural-networks-and-emotional-learning-approach
#13
Noushin Jafarpisheh, Mohammad Teshnehlab
In the present era, enormous factors contribute to causing cancer. So cancer classification cannot rely only on doctor's thoughts. As a result, intelligent algorithms concerning doctor's help are inevitable. Therefore, the authors are motivated to suggest a novel algorithm to classify three cancer datasets; colon, ALL-AML, and leukaemia cancers. Their proposed algorithm is based on the deep neural network and emotional learning process. First of all, by applying the principal component analysis, they had a feature reduction...
December 2018: IET Systems Biology
https://read.qxmd.com/read/30472688/identification-of-essential-proteins-based-on-a-new-combination-of-topological-and-biological-features-in-weighted-protein-protein-interaction-networks
#14
Abdolkarim Elahi, Seyed Morteza Babamir
The identification of essential proteins in protein-protein interaction (PPI) networks is not only important in understanding the process of cellular life but also useful in diagnosis and drug design. The network topology-based centrality measures are sensitive to noise of network. Moreover, these measures cannot detect low-connectivity essential proteins. The authors have proposed a new method using a combination of topological centrality measures and biological features based on statistical analyses of essential proteins and protein complexes...
December 2018: IET Systems Biology
https://read.qxmd.com/read/30472687/dynamic-optimal-experimental-design-yields-marginal-improvement-over-steady-state-results-for-computational-maximisation-of-regulatory-t-cell-induction-in-ex-vivo-culture
#15
Andrew Sinkoe, Arul Jayaraman, Juergen Hahn
The isolation of T cells, followed by differentiation into Regulatory T cells (Tregs), and re-transplantation into the body has been proposed as a therapeutic option for inflammatory bowel disease. A key requirement for making this a viable therapeutic option is the generation of a large population of Tregs. However, cytokines in the local microenvironment can impact the yield of Tregs during differentiation. As such, experimental design is an essential part of evaluating the importance of different cytokine concentrations for Treg differentiation...
December 2018: IET Systems Biology
https://read.qxmd.com/read/30472686/biological-pest-control-using-a-model-based-robust-feedback
#16
Hector Puebla, Priti Kumar Roy, Alejandra Velasco-Perez, Margarita M Gonzalez-Brambila
Biological control is the artificial manipulation of natural enemies of a pest for its regulation to densities below a threshold for economic damage. The authors address the biological control of a class of pest population models using a model-based robust feedback approach. The proposed control framework is based on a recursive cascade control scheme exploiting the chained form of pest population models and the use of virtual inputs. The robust feedback is formulated considering the non-linear model uncertainties via a simple and intuitive control design...
December 2018: IET Systems Biology
https://read.qxmd.com/read/30259868/topological-alternate-centrality-measure-capturing-drug-targets-in-the-network-of-mapk-pathways
#17
V K Md Aksam, V M Chandrasekaran, Sundaramurthy Pandurangan
A new centrality of the nodes in the network is proposed called alternate centrality, which can isolate effective drug targets in the complex signalling network. Alternate centrality metric defined over the network substructure (four nodes - motifs). The nodes involving in alternative activation in the motifs gain in metric values. Targeting high alternative centrality nodes hypothesised to be destructive free to the network due to their alternative activation mechanism. Overlapping and crosstalk among the gene products in the conserved network of MAPK pathways selected for the study...
October 2018: IET Systems Biology
https://read.qxmd.com/read/30259867/blood-glucose-regulation-in-type-1-diabetic-patients-an-adaptive-parametric-compensation-control-based-approach
#18
Anirudh Nath, Dipankar Deb, Rajeeb Dey, Sipon Das
Here, a direct adaptive control strategy with parametric compensation is adopted for an uncertain non-linear model representing blood glucose regulation in type 1 diabetes mellitus patients. The uncertain parameters of the model are updated by appropriate design of adaptation laws using the Lyapunov method. The closed-loop response of the plasma glucose concentration as well as external insulin infusion rate is analysed for a wide range of variation of the model parameters through extensive simulation studies...
October 2018: IET Systems Biology
https://read.qxmd.com/read/30259866/fold-change-based-approach-for-identification-of-significant-network-markers-in-breast-lung-and-prostate-cancer
#19
Richa K Makhijani, Shital A Raut, Hemant J Purohit
Cancer belongs to a class of highly aggressive diseases and a leading cause of death in the world. With more than 100 types of cancers, breast, lung and prostate cancer remain to be the most common types. To identify essential network markers (NMs) and therapeutic targets in these cancers, the authors present a novel approach which uses gene expression data from microarray and RNA-seq platforms and utilises the results from this data to evaluate protein-protein interaction (PPI) network. Differentially expressed genes (DEGs) are extracted from microarray data using three different statistical methods in R, to produce a consistent set of genes...
October 2018: IET Systems Biology
https://read.qxmd.com/read/30259865/bifurcation-analysis-of-insulin-regulated-mtor-signalling-pathway-in-cancer-cells
#20
Krishnamachari Sriram
Insulin induced mTOR signalling pathway is a complex network implicated in many types of cancers. The molecular mechanism of this pathway is highly complex and the dynamics is tightly regulated by intricate positive and negative feedback loops. In breast cancer cell lines, metformin has been shown to induce phosphorylation at specific serine sites in insulin regulated substrate of mTOR pathway that results in apoptosis over cell proliferation. The author models and performs bifurcation analysis to simulate cell proliferation and apoptosis in mTOR signalling pathway to capture the dynamics both in the presence and absence of metformin in cancer cells...
October 2018: IET Systems Biology
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