NDVs are classified into velogenic, mesogenic
and lentogenic strains based on their pathogenicity (Beard and Hanson, 1984).
The biologic and genomic evaluation based results proposed that pigeon isolates belonged to genotype VI and sub-genotype 'm' as mesogenic
whereas teal/duck was found to have genotype VII and sub-genotype 'i' as velogenic.
NDV's also differ in the severity and type of the anomalies they cause, and various pathotypes, based on pathogenicity in poultry and the patterns around the protease cleavage site of fusion protein (F), have been defined in poultry: viscerotropic velogenic, neurotropic velogenic, mesogenic
, lentogenic or respiratory, and asymptomatic (Alexander and Senne, 2008).
Pathogenicity indices such as the mean death time (MDT) in 9-10-day-old embryonated chicken eggs and the intracerebral pathogenicity index (ICPI) in 1-day-old chicks are often used to classify the virus isolates into velogenic, mesogenic
, and lentogenic strains .
The mechanism for the nematic liquid crystalline elastomers is that the ordering of mesogenic
moieties and elastic properties of liquid crystalline elastomers enable a two-way SME in the liquid crystal elastomer.
Viruses of low pathogenicity or lentogenic result in subclinical disease, whereas those of moderate pathogenicity or mesogenic
generally causes clinical signs of disease, but typically result in nonlethal outcomes in chickens.
Dielectric response of liquid crystalline epoxy compounds is quite complex due to the presence of polar, rigid mesogenic
Both viscerotropic and neurotropic pathotypes cause high mortality rate accompanied by intestinal lesions or nervous signs; (c) mesogenic
pathotype causes a low mortality rate and respiratory and nervous signs; (d) lentogenic pathotype is the causative agent of clinically mild or unapparent infections of respiratory tract; and eventually (e) asymptomatic pathotype and its reflection on chicks are unapparent intestinal infections .
The molecular shape arguments indicate that such complexes could be potential candidates for new liquid crystalline materials after careful functionalization of BTU derivatives with suitable mesogenic
Many researchers have reported the synthesis, phase behavior, curing behavior, and thermal properties of various LCERs that include several basic rigid rod mesogenic
group types, such as biphenyl [12-17], ester [18-24], [alpha]-methylstilbene [25-30], azine [31-33], and naphthalene [34, 35], The biphenol-based LCER synthesized by Su  showed a high glass transition temperature ([T.sub.g]) and a low CTE.
On 8th week, mesogenic
strain [R.sub.2]B was given in T4, T5 and T6 groups and TANUVAS oral pellet vaccine was given to T2 and T3 group as booster vaccination.
These liquid crystalline polymers usually consist of a linear rigid mesogenic
moiety (for example benzene ring, biphenyl group) and a flexible spacer (C=N, N=N etc) in the main chain [7-10].