scholarly journals Monitoring of river health using aquatic insects: A study on Jatinga River, North East India

2021 ◽  
Vol 4 (4) ◽  
pp. 363-375
Author(s):  
Tanushree Chakravarty ◽  
Susmita Gupta
Keyword(s):  
Aquatic Insects ◽  
Functional Feeding Groups ◽  
River Health ◽  
North East India ◽  
Post Monsoon ◽  
North East ◽  
Quality Of Water ◽  
First Time ◽  
Varia Tions

A biomonitoring study of River Jatinga located in south Assam, north east In-dia was conducted for the first time. The study aimed to evaluate water quality of the river in different stretches using aquatic in-sect as bioindicators. Insect samples were collected from selected sites of mid-stream and downstream of the river during monsoon- post monsoon, 2018 and winter- pre monsoon, 2019. A total of 25 families of aquatic insects recorded from 8 orders; Gerridae was eudominant in midstream across all the seasons with highest percentage in win-ter. Hemiptera, the most di-verse group was represented by six families with highest relative abundance. The study found that although both the sites were repre-sented by same functional feeding groups, there were seasonal and spatial varia-tions in the families of in-sects and their percentage occurrences. All the biotic indices, BMWPTHAI, SIG-NAL2 scores, EPT % and HFBI have shown relatively better quality of water of the River Jatinga in the mid-stream than that in the downstream during mon-soon and post monsoon sea-sons. Presence/absence and abundance of certain insect groups can provide infor-mation about health of the river.

scholarly journals Antiplasmodial Activity of Gnetum gnemon Leaves and Compounds Isolated from them

2018 ◽  
Vol 13 (10) ◽  
pp. 1934578X1801301
Author(s):  
Partha P Dutta ◽  
Manobjyoti Bordoloi ◽  
Sonali Roy ◽  
Bardwi Narzary ◽  
Kabita Gogoi ◽  
...  
Keyword(s):  
Ethanol Extract ◽  
Antiplasmodial Activity ◽  
Future Studies ◽  
North East India ◽  
North East ◽  
Gnetum Gnemon ◽  
Preliminary Study ◽  
Low Cytotoxicity ◽  
First Time

Gnetum gnemon L. (Gnetaceae) is used traditionally for treating malaria related fever by indigenous people of North East India. In our preliminary study, the ethanol extract of G. gnemon leaves showed promising antiplamodial activity against Plasmodium falciparum chloroquine sensitive (3D7) strain in vitro with an IC50 value of 29.4 μg/mL. Therefore, it was further investigated, and by following a bioassay guided approach, 2,3-dihydroxypropyl icosanoate (1), oleic acid (2) and ursolic acid (3) were isolated for the first time from this plant. Compound 3 showed highest antiplasmodial activity with IC50 values of 4.0 and 6.0 μg/mL against chloroquine sensitive (3D7) and resistant (Dd2) strains of P. falciparum, respectively. The antiplasmodial activity of 1 (IC50 9.5 and 11.4 μg/mL) and 2 (IC50 17.6 and 21.1 μg/mL) was moderate. The isolated constituents showed low cytotoxicity against rat skeletal muscle (L6) and human cervical cancer (HeLa) cells. This is the first report on the antimalarial potential of G. gnemon and the isolated compounds may be responsible for its activity. The findings of the study are in line with the ethnopharmacological claim and can be possible leads for future studies.

scholarly journals Analysis of rainfall and temperature trends of selected stations over North East India during last century

MAUSAM ◽  
2021 ◽  
Vol 65 (4) ◽  
pp. 497-508
Author(s):  
S.I. LASKAR ◽  
S.D. KOTAL ◽  
S.K.ROY BHOWMIK
Keyword(s):  
Monsoon Season ◽  
Maximum Temperature ◽  
Rainfall Time Series ◽  
North East India ◽  
Post Monsoon ◽  
North East ◽  
The North ◽  
Increasing Trend ◽  
Post Monsoon Season ◽  
Increasing Trends

In this study, the trends of seasonal maximum and minimum temperatures and rainfall time series were investigated for 9 selected stations in the north eastern India with the available data stretching between the years 1913-2012.During the period under study the minimum temperature has increasing trends in almost all the stations of north east India except Cherrapunji where it shows decreasing trend in all the season of the year. In case of maximum temperature Cherrapunji, Guwahati and Imphal show increasing trends during all the seasons. Agartala and Shillong show increasing trend of maximum temperature during monsoon and post monsoon season. Dibrugarh and Pasighat show decreasing trend during pre monsoon season and increasing trend during all other seasons of the year. Gangtok shows decreasing trend of maximum temperature during all the seasons where as Silchar shows no trend in maximum temperature.Out of all the selected nine stations, most of the stations show either decreasing trend or no trend of rainfall except Guwahati which shows significant increasing trend of rainfall during post monsoon season.

scholarly journals A report on new chromosome number of three Dioscorea species

2019 ◽  
Vol 6 (2) ◽  
pp. 147-150
Author(s):  
Chiranjit Paul ◽  
Bimal Debnath
Keyword(s):  
Chromosome Number ◽  
Somatic Chromosome ◽  
Chromosome Count ◽  
Somatic Chromosome Number ◽  
Chromosome Counts ◽  
North East India ◽  
North East ◽  
Forest Belts ◽  
Dioscorea Species ◽  
First Time

Chromosomal study conducted in nine species of Dioscorea from different forest belts of Tripura revealed that their somatic chromosome number ranged from 2n=40 to 2n=60. The record of 2n=40 chromosome in the sexual phenotypes of Dioscorea hamiltonii, Dioscorea glabra and Dioscorea pubera are the first time report from Tripura, North East India. Moreover the somatic chromosome counts of 2n=60 in Dioscorea pentaphylla would be attributed as a new cytotype. However at the respective ploidy level no difference in somatic chromosome count was observed between their sexes.

Nematode parasites of invertebrates from Manipur, North East India (Diagnosis, keys and illustration)

Zootaxa ◽  
2011 ◽  
Vol 3107 (1) ◽  
pp. 1 ◽  
Author(s):  
M. MANJUR SHAH ◽  
N. MOHILAL ◽  
M. PRAMODINI ◽  
L. BINA ◽  
TH. HEMANANDA
Keyword(s):  
Present Report ◽  
Parasitic Nematodes ◽  
Key To Species ◽  
North East India ◽  
North East ◽  
Nematode Parasites ◽  
Time Out ◽  
First Time

The present report is based on findings of occasional survey work conducted from the region spanning over six years for the presence of insect parasitic nematodes under the superfamily Thelastomatoidea (Nematoda: Oxyurida), parasitic in invertebrate hosts. Out of five families recognized under the superfamily, the present report discusses the findings of four families from Manipur and its adjoining areas as well. For the first time, out of 15 taxa described in the text, seven species are described from the region, eight species reported. The findings of the study will help in understanding of the biodiversity status of insect parasitic nematodes of the region. Diagnosis of the genus, key to species and illustration with line diagrams and photomicrographs are provided in the manuscript.

New data on the genus Barsine Walker, 1854 from India, with description of a new species (Lepidoptera: Erebidae: Arctiinae: Lithosiini)

Zootaxa ◽  
2018 ◽  
Vol 4425 (3) ◽  
pp. 456 ◽  
Author(s):  
RAHUL JOSHI ◽  
NAVNEET SINGH ◽  
ANTON V. VOLYNKIN
Keyword(s):  
New Species ◽  
Species Group ◽  
Female Genitalia ◽  
New Combinations ◽  
Male And Female ◽  
North East India ◽  
North East ◽  
First Time ◽  
A New Species

A new species, Barsine pseudoradians Joshi, Singh & Volynkin sp. nov. is described from North East India (Mizoram, Assam and Meghalaya) and Nepal. The new species belongs to the Barsine prominens (Moore) species-group and is compared with B. radians (Moore, 1878), B. pluma Černy, 2009, B. syntypica Swinhoe, 1906 and B. maculifasciata (Hampson, 1894). Barsine callida (Fang, 1991) is reported for the first time from India. Its comparison with the related Barsine mesortha (Hampson, 1898) is given. Two new combinations are established: Barsine callida (Fang, 1991), comb. nov. and Barsine germana (Rothschild, 1913), comb. nov. Adults, male and female genitalia of all the reviewed species are illustrated. 

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