Search results for "Tip growth"

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Observation of instability of faceted crystals in lipid monolayers

1998

Abstract The morphological instabilities of two-dimensional hexagonal crystals in lipid monolayers are studied. Fluorescence microscopy indicates that beyond a critical size the faceted crystal develops into dendrites with unusual tip growth behavior, which is not consistent with the current theory of dendritic growth. The morphological transitions in relation to the driving force for two-dimensional crystal growth are also studied.

CrystalPhysicsChemical physicsMonolayerFluorescence microscopeGeneral Physics and AstronomyPattern formationNanotechnologyHexagonal crystalsCrystal growthTip growthInstability
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Microtubule distribution in gravitropic protonemata of the mossCeratodon

1990

Tip cells of dark-grown protonemata of the moss Ceratodon purpureus are negatively gravitropic (grow upward). They possess a unique longitudinal zonation: (1) a tip group of amylochloroplasts in the apical dome, (2) a plastid-free zone, (3) a zone of significant plastid sedimentation, and (4) a zone of mostly non-sedimenting plastids. Immunofluorescence of vertical cells showed microtubules distributed throughout the cytoplasm in a mostly axial orientation extending through all zones. Optical sectioning revealed a close spatial association between microtubules and plastids. A majority (two thirds) of protonemata gravistimulated for > 20 min had a higher density of microtubules near the lowe…

GravitropismPlant DevelopmentPlant ScienceBiologyMicrotubulesGravitropismchemistry.chemical_compoundMicrotubulePlant CellsSulfanilamidesBotanyPlastidsTip growthPlastidProtonemaNitrobenzenesCeratodon purpureusHerbicidesfungifood and beveragesOrganothiophosphorus CompoundsCell BiologyGeneral MedicineDarknessPlantsOryzalinbiology.organism_classificationCell CompartmentationDinitrobenzeneschemistryCytoplasmMicrotubule ProteinsBiophysicsGravitationProtoplasma
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