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Institution

North Eastern Hill University

EducationShillong, Meghalaya, India
About: North Eastern Hill University is a education organization based out in Shillong, Meghalaya, India. It is known for research contribution in the topics: Population & Ruthenium. The organization has 2318 authors who have published 4476 publications receiving 48894 citations.
Topics: Population, Ruthenium, Ligand, Catalysis, Micelle


Papers
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Journal ArticleDOI
TL;DR: A protocol for induction of direct somatic embryogenesis and subsequent plant regeneration for the medicinally important and endangered plant Paris polyphylla Sm.
Abstract: A protocol for induction of direct somatic embryogenesis and subsequent plant regeneration for the medicinally important and endangered plant Paris polyphylla Sm. has been developed for the first time. Immature zygotic embryos (IZEs) were cultured on different media namely Gamborg (B5), ½ B5, Murashige and Skoog (MS), ½ MS, Chu et al. (N6), ½ N6, Schenk and Hildebrandt (SH) and ½ SH. Highest frequency of somatic embryogenesis (32.6 %) and mean number of somatic embryos (SEs) per explant (28.7 ± 1.7) were obtained on ½ MS medium directly without an intermediate callus phase. The frequency of SE induction was significantly increased to 40.7 % when ½ MS medium was solidified with gelrite compared to agar (32.6 %). Secondary somatic embryos (SSEs) appeared on the primary SEs in a repetitive way on plant growth regulator-free ½ MS medium but with a gradual decrease in embryogenic potential during subsequent subcultures. Plasmolyzing pre-treatment of SSEs with 1.0 M mannitol for 12 h effectively maintains its embryogenic capacity. Primary embryos at the elongated dimpled and early cotyledonary stage displayed the highest embryo forming capacity of 26.94 and 27.87, respectively. High frequency of SE germination (94.0 %) occurred on ½ MS medium with 0.5 mg/l gibberellic acid. Highest percentage of seedling to plantlet conversion was observed in the medium supplemented with 0.05 mg/l 6-benzylaminopurine and 0.1 mg/l α-naphthalene acetic acid. Regenerated plants displayed morphological characteristics similar to that of the wild plants. Flow cytometry analysis showed ploidy stability of the regenerated plants.

22 citations

Journal ArticleDOI
TL;DR: A comparative analysis of the results with the existing data suggests multiple origins of Austro‐Asiatic tribes in India, and particularly the Asian and non‐Asian origins of the Mon‐Khmer and the Mundari populations.
Abstract: In the present study, we analyzed 1,686 samples from 31 tribal populations of India for the mitochondrial DNA 9-base-pair deletion/insertion polymorphism, and characterized them based on the relevant mitochondrial DNA coding-region single nucleotide polymorphisms and hypervariable region I motifs, to test the genetic origins of the ethnically and linguistically heterogeneous Austro-Asiatic tribes of India. A comparative analysis of our results with the existing data suggests multiple origins of Austro-Asiatic tribes in India, and particularly the Asian and non-Asian origins of the Mon-Khmer and the Mundari populations. We also identified a novel subclade of haplogroup B in the Mon-Khmer Khasi tribes that distinguishes them from the Nicobarese, indicating two different waves of migration of the Mon-Khmer tribes in India.

22 citations

Journal ArticleDOI
TL;DR: The influence of Assam crude on growth, photosynthesis ({sup 14}C incorporation), nitrogen fixation (nitrogenase activity) and heterocyst differentiation in Anabaena doliolum is reported.
Abstract: Petroleum contaminants pose serious threat to the structure and functioning of aquatic ecosystems. Although their effects on various algal species have been studied before, heterocystous blue-green algae (cyanobacteria) have been little explored in this regard. Inadequate information concerning the effects of petroleum oils on them, especially on their nitrogen fixing system, prompted the authors to undertake this study. In this communication the authors report the influence of Assam crude on growth, photosynthesis ({sup 14}C incorporation), nitrogen fixation (nitrogenase activity) and heterocyst differentiation in Anabaena doliolum. This species and other heterocystous cyanobacteria occur widely in soil and aquatic ecosystems.

22 citations

Journal ArticleDOI
TL;DR: In this paper, the authors evaluated the impact of shortening of the jhum cycle on the ecosystem productivity and economic yield in a young and an old jhum fallow in North-Etern India.
Abstract: Cropping on jhum fallows in north-eartern India is predominantly done for one year in a jhum cycle. If second year cropping is done, expanse of the forest land required for slashing and burning could be reduced significantly. We tested this hypothesis in a young (6 yr) and an old (20 yr) jhum fallow. We also evaluated if the productivity during second year cropping could be alleviated by auxiliary measures such as tilling the soil or application of fertilizers (chemical or farm-yard manure or both in combination). The results demonstrate that the ecosystem productivity (total dry matter production) and economic yield (rice grain production) decline with shortening of jhum cycle. Second year cropping causes a further decline in ecosystem productivity in old jhum field, but not in young jhum field. Economic yield from second year cropping in its traditional form (without any fertilizer treatment) is not much lower than that in the first year, and can be improved further by manuring the soil. Tilling of soil improves neither ecosystem productivity nor economic yield. Different fertilization treatments respond differently; while inorganic manuring enhances ecosystem productivity, a combination of inorganic and organic manuring improves economic yield

22 citations

Journal ArticleDOI
TL;DR: In this article, the dynamics of excited state intramolecular proton transfer (ESIPT) and solution phase fluorescence properties of 4-methyl-2,6-diformyl phenol (MFOH) and its derivative, 4methyl-1,6,diacetylphenol (MAOH) have been monitored by nanosecond time correlated single photon counting and femtosecond transient absorption techniques.
Abstract: Dynamics of excited state intramolecular proton transfer (ESIPT) and solution phase fluorescence properties of 4-methyl-2,6-diformyl phenol (MFOH) and its derivative, 4-methyl-2,6-diacetyl phenol (MAOH), have been monitored by nanosecond time correlated single photon counting and femtosecond transient absorption techniques. Time evolution of the transient absorption data reveals that both the compounds undergo an ultrafast proton transfer, yet with a significantly slower rate constant of about 4–5 × 10 12 s −1 compared to the other intramolecularly hydrogen bonded systems reported recently. This is explained on the basis of large skeletal rearrangement necessary for the proton transfer to occur. The ultrafast ESIPT process is followed by rapid intramolecular vibrational relaxation (IVR) with a time constant of few picoseconds before fluorescence emission occurs from the proton transferred keto structure in the excited state potential energy surface.

21 citations


Authors

Showing all 2368 results

NameH-indexPapersCitations
Vivek Sharma1503030136228
Patrick J. Carroll5850513046
Majeti Narasimha Vara Prasad5622715193
Arun Sharma5537111364
Michael Schmittel5338710461
Birgitta Bergman5218710975
Harikesh Bahadur Singh463077372
Lal Chand Rai401344513
B. Dey403548089
Hiriyakkanavar Ila364075633
Jürgen-Hinrich Fuhrhop352085130
Sreebrata Goswami341423228
Gagan B.N. Chainy331074151
J.P. Gaur31643957
Hiriyakkanavar Junjappa303494102
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202321
202254
2021352
2020308
2019293
2018306