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Welfare Effect
Published in Wayne T. Davis, Joshua S. Fu, Thad Godish, Air Quality, 2021
Wayne T. Davis, Joshua S. Fu, Thad Godish
Fluoride injury on narrow-leaved species is characterized by tip necrosis that extends in irregular streaks down the leaf. Necrotic tissue may vary in color from ivory to various shades of brown. A band of dark brown tissue sharply demarks injured from healthy tissues. Symptoms consist of chlorotic mottle at the margins and leaf tips. Small irregular chlorotic patches form between the veins and merge to form continuous bands as injury becomes extensive. Necrosis occurs when tissue injury is severe.
Fundamentals of biology and thermodynamics
Published in Mohammad E. Khosroshahi, Applications of Biophotonics and Nanobiomaterials in Biomedical Engineering, 2017
(a) Necrosis (i.e., the stage of dying, the act of killing) is a form of cell injury which results in the premature death of cells in living tissue by autolysis. Necrosis can be caused by factors external to the cell or tissue, such as temperature, infection, toxins, or trauma, and (b) Apoptosis is a programmed cell death through well-defined steps of morphological changes. There are two mechanisms by which apoptosis can occur. First, it is triggered by internal signals from within the cell, such as an internal damage to a protein in the outer membranes of the mitochondria, and the second is by external signals, sometimes known as death activators, which bind to receptors at the cell surface.
Pathology
Published in John A Plumb, Health Maintenance Of Cultured Fishes, 1994
Necrosis is the death of cells or tissues following cell degeneration in a living animal and is the final stage in irreversible degeneration. Necrosis should not be confused with post-mortem change which is cellular deterioration after death of an animal. Characteristics of necrotic tissue can include paler than normal color; loss of tensile strength (tissue becomes friable and easily tom); may have a cheesy or pasty consistency; and an unpleasant odor may be present.
An image feature selection approach for dimensionality reduction based on kNN and SVM for AkT proteins
Published in Cogent Engineering, 2019
Shruti Jain, Ayodeji Olalekan Salau
Communication triggered for cell survival/apoptosis is achieved by three different input proteins. Apoptosis is a process in which an organ, tissue or organism which is made up of many cells intentionally decides to die while a necrosis is a process in which a cell dies due to deprivation or trauma. This paper presents the study of different feature selection algorithms, namely: filter method, wrapper method and embedded method. We have applied feature selection on HT carcinoma cells. Out of 11 proteins, 7 proteins were selected using wrapper method while we only considered the AkT protein. Furthermore, we classified AkT using SVM (linear, polynomial, RBF and sigmoid functions for Tier 1 and Tier 2) and kNN. Using the Euclidean distance approach for kNN and linear Tier 1 approach for SVM, the classification performance for GLDS features was calculated giving an accuracy of 76.9% and 84.6% respectively.