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- W2041775085 abstract "Summaryo Increases in polar lipids (principally phospholipids) and lipoproteins without changes in total lipids are shown to occur in the living bark cells of the black locust tree during development of extreme freezing resistance or hardiness in autumn, and it is suggested that a process of membrane replication is occurring as part of the mechanism of resistance. Electron and light microscope studies with fixed cells confirm earlier chemical and cytological studies in indicating that this membrane replication is, under normal hardening conditions in autumn, a part of a process of whole protoplasmic augmentation occurring at this time. Events occurring under two sets of circumstances a) and b) would suggest that a condition of hardiness associated with phospholipid increases and presumably membrane replication can be disengaged from the condition related to whole protoplasmic augmentation: a) In autumn under conditions of starvation established by girdling or isolation of bark its is shown that cytoplasmic augmentation (as indicated cytologically or in amounts of soluble protein and nucleic acid in the cells) can be arrested while phospholipid synthesis and a limited degree of hardening proceed. b) In spring an early drop in hardiness is associated with dissolution of membrane containing organelles well before a decrease in soluble protein component of the cytoplasm occurs. Membrane replication appears to be a vital factor in the hardiness of tree cells but in view of the fact a) that extreme freezing resistance is never achieved without supplementation of the phospholipid changes with whole cytoplasmic augmentation (increase in soluble protein, etc.), b) that graded levels of freezing resistance can be produced according to different degrees of starvation and augmentation of cytoplasm, and c) that some hardening occurs during starch to sugar conversion, it is suggested that normal hardening is a composite of three principal processes which include membrane replication, membrane replication in association with whole protoplasmic angmentation, and starch to sugar conversion." @default.
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- W2041775085 date "1968-11-01" @default.
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- W2041775085 title "Phospholipid, protein, and nucleic acid increases in protoplasm and membrane structures associated with development of extreme freezing resistance in black locust tree cells" @default.
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- W2041775085 doi "https://doi.org/10.1016/s0011-2240(68)80164-6" @default.
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