The study was commenced in a compulsion toaccomplish successful approach developing commercially viable polyploidy variety Jasminum sambac. Rooted cuttings of J. sambac cv. Ramanathapuram Gundumalli were treated with different concentrations colchicine (0.05%, 0.10%, 0.15%, 0.20% and 0.25%) for 48 hours. survival sprouting rates the treatments determined after 45 days treatment phenotypic stoma...

The sudden cessation or sudden decrease in velocity of the protoplasmic streaming of Nitella flexilis is observed whenever an action potential is elicited. The action potential can be generated by an electric stimulus after its refractory period, whether the flow is at a complete standstill or on the way to recovery. The membrane potential is generally decreased more or less when the rate of fl...

The rhythmic contraction of our heart is controlled by electrical impulses that travels throughout the cardiac muscle. signal generated sinus node, which can be thought as natural pacemaker heart. This impulse spreads from its initiation in SA node atria through specialized internodal pathways, to atrial myocardial contractile cells and atrioventricular node.This term paper reviews anatomy Acti...

Interactions between Schwann cells and axons are critical for the development and function of myelinated axons. Two recent studies (see Maurel et al. on p. 861 of this issue; Spiegel et al., 2007) report that the nectin-like (Necl) proteins Necl-1 and -4 are internodal adhesion molecules that are critical for myelination. These studies suggest that Necl proteins mediate a specific interaction b...

We analyzed the relationship between motor nerve conduction velocity (MCV) and morphological changes in regenerating nerve fibers at different times after sciatic nerve transection to identify reliable indices of functional recovery. Thirty rats were divided into five equal groups, one control group and four groups subjected to sciatic nerve transection and immediate suturing, followed by regen...

Neurofilaments in axons are highly phosphorylated at multiple sites on the 200 kDa neurofilament (neurofilament-H) and 160 kDa (neurofilament-M) subunit peptides. We used a panel of monoclonal and polyclonal antibodies against distinct neurofilament epitopes to study the distribution of these epitopes along the axons of large myelinated fibres in rat sciatic nerve using quantitative electron mi...

In myelinated axons, most of the voltage-gated ion channels are concentrated at the nodes of Ranvier, which are short gaps in the myelin sheath. This arrangement leads to saltatory conduction and a larger conduction velocity than in nonmyelinated axons. Intriguingly, axons in the peripheral nervous system that exceed about 2 μm in diameter exhibit a characteristic narrowing of the axon at nodes...