Social Networking Habits of Early and Late Adolescents-A Comparative Study

We are living in the Cyber or Networking Age and the advancement in the field of communication technology has created a world with no boundary or limitation. In India, social networking sites are getting more popular and it has become a vital part of our social life. This study seeks to find out the “social networking habits of adolescents”. Sixty early adolescents in the age group of 12 – 14 years and sixty late adolescents in the age group of 15 – 18 years, forming a total of 120 respondents were selected for the comparative study. The study revealed that the social networking habits of early and late adolescents did not differ significantly. However early adolescents were found to be more extensive user of social networking. The study also showed that although the respondents favoured social networking and spent considerable amount of time in social networking, they are concerned about the addictive influence of social networks and social networking habits taking away their time and deviating them from their responsibilities

RELATIONSHIP BETWEEN SOCIO-ECONOMIC AND PARTICIPATION OF RURAL WOMEN IN PADDY CULTIVATION IN IMPHAL-WEST DISTRICT OF MANIPUR

Women plays a significant and crucial role in agricultural development and allied fields. The central role of women in any society ensures stability, progress and long-term development of a nation. Rice is the stable food of more than half of the world’s populations. It is known fact that rural women historically have played and continue to play important role in rice farming activities. Considering the importance regarding the extent of participation of rural women in rice cultivation. Hence the present study was undertaken to find out the extent of participation of rural women in paddy cultivation with respect to socio-economic profile of rural women of Wangoi tehsil in Imphal- West district of Manipur. The study revealed that the relationship between participation and socio-economic profile of respondents were Education(0.295*), Mass media exposure (0.371*), Social participation(0.430*), Sources of information(0.300*), Innovative Proneness(0.478*) and Economic motivation(0.414*) are positively significant at 0.05% whereas Age(-0.164NS), Family size(0.186NS), Annual income(0.177NS) and Land holdings(-0.159NS) are positive but non-significant at 0.05% to extend of participation of the respondent respectively. View Article DOI: 10.47856/ijaast.2021.v08i4.00

High Frequency Plant Regeneration System of Aerides odorata Lour. Through Foliar and Shoot Tip Culture

An efficient protocol for rapid clonal propagation from different explants of Aerides odorata Lour.- an endemic orchid of Manipur has been established. Leaf base explants showed significant response in ½ strength Murashige and Skoog medium supplemented with thidiazuron (TDZ) and 6-benzylaminopurine (BAP). Callus were initiated only from leaf base explants after 60 days of culture while other parts of leaves failed to response in all the treatments. Medium supplemented with 1.0 mg/L TDZ produced protocorm like bodies (PLBs) at the leaf base. Shoot tip explants of A. odorata showed different morphogenetic responses in different phytohormone treatments. Calli were initiated only in the medium containing α-naphthalene acetic acid (NAA). Highest calli frequency was observed in the medium containing 2 mg/L (NAA) (85.71±0.21) which indicates the importance of exogenous auxin in embryonic callus proliferation. Direct shoot regeneration on the other hand was observed in all the treatments. Highest number of shoot was obtained in higher concentration of NAA (2 mg/L) and BAP (4 mg/L) (4.80±0.18), showing combined effect of BAP and NAA, which may be due to the synergistic effect of cytokinin and auxin. Among the different rooting phytohormones, addition of NAA (0.5 mg/L) in ½ MS medium shows highest frequency of root induction. More than 95% in vitro plants survived during acclimatization under ex vitro conditions. This phytohormones and explants based micropropagation system can open up the route for in vitro clonal multiplication of this commercially important Aerides species

Did a submarine landslide contribute to the 2011 Tohoku tsunami?

Many studies have modeled the Tohoku tsunami of March 11, 2011 as being due entirely to slip on an earthquake fault, but the following discrepancies suggest that further research is warranted. (1) Published models of tsunami propagation and coastal impact underpredict the observed runup heights of up to 40 m measured along the coast of the Sanriku district in the northeast part of Honshu Island. (2) Published models cannot reproduce the timing and high-frequency content of tsunami waves recorded at three nearshore buoys off Sanriku, nor the timing and dispersion properties of the waveforms at offshore DART buoy #21418. (3) The rupture centroids obtained by tsunami inversions are biased about 60 km NNE of that obtained by the Global CMT Project. Based on an analysis of seismic and geodetic data, together with recorded tsunami waveforms, we propose that, while the primary source of the tsunami was the vertical displacement of the seafloor due to the earthquake, an additional tsunami source is also required. We infer the location of the proposed additional source based on an analysis of the travel times of higher-frequency tsunami waves observed at nearshore buoys. We further propose that the most likely additional tsunami source was a submarine mass failure (SMF—i.e., a submarine landslide). A comparison of pre- and post-tsunami bathymetric surveys reveals tens of meters of vertical seafloor movement at the proposed SMF location, and a slope stability analysis confirms that the horizontal acceleration from the earthquake was sufficient to trigger an SMF. Forward modeling of the tsunami generated by a combination of the earthquake and the SMF reproduces the recorded on-, near- and offshore tsunami observations well, particularly the high-frequency component of the tsunami waves off Sanriku, which were not well simulated by previous models. The conclusion that a significant part of the 2011 Tohoku tsunami was generated by an SMF source has important implications for estimates of tsunami hazard in the Tohoku region as well as in other tectonically similar regions

High Frequency Plant Regeneration System from Transverse Thin Cell Layer Section of <i>In vitro</i> Derived ‘Nadia’ Ginger Microrhizome

An efficient and reproducible procedure is outlined for rapid in vitro multiplication of Zingiber officinale var. ‘Nadia’ through high frequency shoot proliferation from transverse thin cell layer (tTCL) sections of in vitro derived microrhizome. In vitro derived microrhizome of size 500 μm in thickness was used as initial explants for induction of somatic embryos. Among the different phytohormones tested, tTCL explants shows maximum calli proliferation in medium containing 2 mg/L 2,4-Dichlorophenoxyacetic acid (88.30±0.11%). Reduced concentration of 2,4 Dichlorophenoxyacetic acid was supplemented with different cytokinins for regeneration of callus. Among the different medium tested, optimum redifferentiation of somatic embryos were observed in medium containing 0.2 mg/L 2,4 Dichlorophenoxyacetic acid and 6.0 mg/L BAP (141.08±0.25). Clump of regenerated plantlets were further subculture and transfer into microrhizome inducing medium containing high sucrose concentration (8%). Plantlets with well developed microrhizome were successfully acclimatized and eventually transferred to the field. The application of studying embryo section for regeneration of plants might be useful alternative to ginger improvement programme. Histological analysis showed formation of somatic embryos and regenerated adventitious shoot

Effect of Silver Nitrate During<i>Ex vitro</i> Acclimatization of Micropropagated Ginger Cultivars

Silver nitrate (AgNO3) was used under in vitro conditions to study the response of ginger cultivars ‘Nadia’ and ‘Baishey’ under ex vitro. Micropropagated plants treated with AgNO3 showed significant difference (

High Frequency Plant Regeneration System from Transverse Thin Cell Layer Section of <i>In vitro</i> Derived ‘Nadia’ Ginger Microrhizome

An efficient and reproducible procedure is outlined for rapid in vitro multiplication of <i>Zingiber officinale</i> var. ‘Nadia’ through high frequency shoot proliferation from transverse thin cell layer (tTCL) sections of in vitro derived microrhizome. <i>In vitro</i> derived microrhizome of size 500 μm in thickness was used as initial explants for induction of somatic embryos. Among the different phytohormones tested, tTCL explants shows maximum calli proliferation in medium containing 2 mg/L 2,4-Dichlorophenoxyacetic acid (88.30±0.11%). Reduced concentration of 2,4 Dichlorophenoxyacetic acid was supplemented with different cytokinins for regeneration of callus. Among the different medium tested, optimum redifferentiation of somatic embryos were observed in medium containing 0.2 mg/L 2,4 Dichlorophenoxyacetic acid and 6.0 mg/L BAP (141.08±0.25). Clump of regenerated plantlets were further subculture and transfer into microrhizome inducing medium containing high sucrose concentration (8%). Plantlets with well developed microrhizome were successfully acclimatized and eventually transferred to the field. The application of studying embryo section for regeneration of plants might be useful alternative to ginger improvement programme. Histological analysis showed formation of somatic embryos and regenerated adventitious shoot