Water your Norfolk Island pine when the top of the soil feels dry to the touch. Fertilize your Norfolk pine in the spring and summer with a water soluble balanced fertilizer, but you do not need to fertilize in the fall or winter. It is normal for Norfolk Island pine trees to have some browning on the bottom branches.irst thing to keep in mind with the care of Norfolk pines is that they are not cold hardy. They are a tropical plant and cannot tolerate temperatures below 35 F. (1 C.). For many parts of the country, the Norfolk Island pine tree cannot be planted outside year round. It also needs to be kept away from cold drafts.
Microfilaments (or actin filaments) are the thinnest filaments of the cytoskeleton found in the cytoplasm of all eukaryotic cells. These linear polymers of actin subunits are flexible and relatively strong, resisting buckling by multi-piconewton compressive forces and filament fracture by nanonewton tensile forces.
Most eukaryotic cells contain a complex network of protein fibers called the cytoskeleton. It forms a framework for the movement of organelles around the cytoplasm-most of the organelles are attached to the cytoskeleton. The network consists of protein microfilaments, intermediate filaments, and microtubules. The cytoskeleton provides an important structural framework for: 1  Cell shape. 2  For cells without cell walls, the cytoskeleton determines the shape of the cell. 3  This is one of the functions of the intermediate filaments. 4  Cell movement.