Studies in the evolutionary biology of cancer research require good estimates of the intrinsic growth rate of the tumour coefficient. A Gompertzian model is a classical continuous model useful in describing population dynamics; in particular, it is a very efficient mathematical modelto describe tumour growth in humans and animals. The Gompertz survival model of a tumour growth is the interest o...

restudied Huxley's measurements of Uca pugnax and presented not only a two-parameter power function but also a three-parameter power function; this three-parameter model 'is better than the two-parameter model for describing the observations'. The two-parameter model has a biological meaning, as explained by Huxley (Huxley, 1924); the three-parameter model has no biological meaning. I have show...

background: assessing the growth of infants is a main parameter in their health assessment. thus, we have studied the growth condition of children from born to 18 months in this research in bandar abbas, iran, 2015. methods: in this descriptive study, we have selected 104 case records from the dataset of health center number 8 of bandarabbas by means of simple randomized sampling. all data abou...

in this study, microball nanosilver was produced with dimensions of about 1 micrometer in order to reduce the risks of absorption of nanosilver particles through skin and inhalation. different concentration levels of silver have been used in making of hand-sheets. the antibacterial properties of all hand-sheets were evaluated again escherichia coli and bacillus subtilis bacteria. results indica...

A simplified model of the gas-surface chemistry occurring during chemical-vapor deposition of diamond thin films is presented. The model results in simple scaling relations, useful for process scale-up and optimization, for growth rate and defect density in terms of the local chemical environment at the substrate. A simple two-parameter expression for growth rate is obtained, which with suitabl...

Title of Document: A SYSTEMATIC INVESTIGATION OF WITHIN-SUBJECT AND BETWEENSUBJECT COVARIANCE STRUCTURES IN GROWTH MIXTURE MODELS Junhui Liu, Doctor of Philosophy, 2012 Directed By: Dr. Jeffrey R. Harring, Department of Human Development and Quantitative Methodology The current study investigated how between-subject and within-subject variance-covariance structures affected the detection of a f...

Most models for ethylene signaling involve a linear pathway. However, measurements of seedling growth kinetics when ethylene is applied and removed have resulted in more complex network models that include coherent feedforward, negative feedback, and positive feedback motifs. The dynamical responses of the proposed networks have not been explored in a quantitative manner. Here, we explore (i) w...

  Propagation of dust ion acoustic waves in plasmas composed of nonthermal distributed electrons and stationary dust particles is investigated. Nonlinear Schrdinger equation is derived to describe small amplitude waves, using the reduction perturbation technique. Modulation instability of dust ion acoustic waves is analysed for this system. Parametric investigation indicates that growth rate of...