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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 426 journals)
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National Academy Science Letters
Journal Prestige (SJR): 0.189
Citation Impact (citeScore): 1
Number of Followers: 3  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0250-541X - ISSN (Online) 2250-1754
Published by Springer-Verlag Homepage  [2471 journals]
  • Lectotypification of Some Names in Rivina (Petiveriaceae) and a New
           Synonym of Rivina humilis L.

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      Abstract: Recently described species Rivina andamanensis L.J. Singh & M.C. Naik from Andaman and Nicobar Islands, India, is synonymised under Rivina humilis L. We studied the morphological variations in the unispecific genus Rivina from the states of Andhra Pradesh, Karnataka, Kerala, Tamil Nadu, Telangana (southern India), Gujarat, Punjab, Rajasthan, Uttarakhand (northern India) and Andaman & Nicobar Islands, and concluded that R. humilis is highly polymorphic species. Lectotypes are designated for three names Rivina orientalis Moq., Rivina portulaccoides Nutt. and Rivina puberula Kunth.
      PubDate: 2022-01-10
       
  • Postharvest Application of 6-Benzylaminopurine Preserves Quality and
           Delays Senescence of Pointed Gourd (Trichosanthes dioica Roxb.) Fruit

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      Abstract: This experiment investigated the effect of postharvest 6-benzylaminopurine treatment for preserving quality and improving storability of pointed gourd fruit. The fruits were treated with 6-benzylaminopurine (1.0 mM, 2.0 mM and 3.0 mM) by immersion method and stored at room temperature while, control fruits were treated with distilled water. Weight loss, total chlorophyll, total carotenoids, malondialdehyde content, ascorbic acid, total phenol and total flavonoids content were monitored at every 2 days of interval during storage. Among the treatments, 3.0 mM BAP-treated fruits showed 24% lower weight loss and 30% lower chlorophyll loss over control. After 6 days of storage, these fruits retained about 21% higher ascorbic acid, 27% higher total phenol and 28% higher total flavonoids than control. Senescence of the treated fruit was also delayed by 3.0 mM 6-benzylaminopurine treatment, showing 22% lower accumulation of malondialdehyde and 26% lower total carotenoids content compared to control.
      PubDate: 2022-01-10
       
  • A New Record of Soft Coral, Sarcophyton subviride Tixier-Durivault, 1958
           (Cnidaria: Anthozoa: Octocorallia)—from Great Nicobar Island, India

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      Abstract: Sarcophyton subviride Tixier-Durivault, 1958 (Cnidaria: Anthozoa: Octocorallia: Alcyonacea), a soft coral, is reported for the first time from Indian waters. This species has previously been recorded from Aldabra Island and Reunion. Despite being the third record in the Indian Ocean, this is the first occurrence from Great Nicobar Island in the Andaman Sea. The diagnostic features of colony sclerites in the surface layer of the colony have clubs and tubercle shaped prominences, whereas slender spindles, cylinders and oval-shaped sclerites are seen in the coenenchyme tissue. Further, few variations in morphology and length of sclerites in the colony were observed. These variations were discussed type specimens published elsewhere in the present study.
      PubDate: 2022-01-08
       
  • Seabuckthorn (Hippophae salicifolia) Leaves, a Good Source of Natural
           Antioxidant Compounds

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      Abstract: Hippophae salicifolia is a popularized important hardy deciduous shrub of the Indian Himalaya and under utilization as a supplement of food, traditional and folk medicine system. The study was focused on quantification of biochemical attributes of leaves collected form male and female plant species by using diverse polarity solvents. Results revealed a significant variation (p < 0.05) in the analyzed parameters among solvent systems, and diverse concentration of the analyzed parameters were recorded. The leaves of female plants exhibited potential sources of diverse bioactive constituents (i.e., phenolics 67.39 mg GAE/g and antioxidants (SOD 92.69; FRAP 0.51; DPPH 85.12 mM AAE/100 g dry weight), and ethanol solvent was recorded best followed by acetone and aqueous, respectively. This is the first attempt which highlighted the biochemical attributes of the leaves and reported that leaves of female plants are rich sources of bioactive constituents and can be utilized for food supplement in the form of green tea or other natural health benefit products, which will be useful for reducing the deficiency of malnutrition and generate employment opportunities for local populace of high-altitude villages of Himalaya.
      PubDate: 2022-01-04
       
  • Extension of Distributional Range with a New Record of Garra annandalei
           Hora, 1921, from River Tapti: Drainage System of the West coast of India

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      Abstract: Garra annandalei Hora, 1921, a species belonging to the family Cyprinidae (order Cypriniformes) was recorded for the first time from the river Tapti drainage system of the west coast of India. A total of 5 specimens were collected during January 2020 by gill net (10–20 mm mesh size) at a water depth of 0.30–1.22 m. This species was so far reported only from the eastern side of India. The present findings extend its range of distribution in the rivers of the west coast of India.
      PubDate: 2022-01-04
       
  • Prevalence and Predation Potential of Rove Beetle Paederus fuscipes Curtis
           (Coleoptera: Staphylinidae) on Invasive Fall Armyworm Spodoptera
           frugiperda in Fodder Maize

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      Abstract: Invasive fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) is emerged as serious threat to maize cultivation in India. Rove beetle, Paederus fuscipes Curtis (Coleoptera: Staphylinidae) are a generalist predator found predating on various stages of FAW. Field incidence of adult rove beetle started during the 40 standard meteorological week and reached its peak population of 6.83/m2 during the 46 standard meteorological week. Within the season, the predatory adult beetle population was found significantly higher at reproductive phase (0.07 to 6.83/m2) than at vegetative phase (0.37 to 3.20/ m2). There was a significant difference on the feeding potential of adult rove beetle against various stages of fall armyworm. Adult P. fuscipes consumed an average of 32.3 eggs, 35.6 first instar larvae and 24.4 second instar larvae of FAW per day. Adult predator fed more on first instar FAW larvae compared to eggs and second instar larvae. This is the first report of feeding potential of adult P. fuscipes on FAW. This study highlighted the role of native generalist predator P. fuscipes in managing invasive FAW. Therefore, conservation of P. fuscipes could be encouraged through use of safer insecticides.
      PubDate: 2022-01-04
       
  • Two New Records of Marine Gastropods and Notes on Bufonaria elegans from
           Andaman and Nicobar Islands, India

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      Abstract: Two species, viz., Euprotomus bulla (Röding, 1798) and Tridentarius dentatus (Linnaeus, 1758) belonging to the family Strombidae are reported for the first time from the Andaman and Nicobar Islands, India. The close similarity in the morphological character sets between Euprotomous bulla and Euprotomous aurisdianae may be a reason for overlooking the former species by early workers. We have defined the dissimilarity between both species and have confirmed its occurrence in the Andaman and Nicobar Islands. In the genus Euprotomous, E. bulla is the second species reported from this region. Tridentarius dentatus has been previously reported from mainland India; however, it is reported from these islands for the first time. There exists a paucity of literature on Bufonaria elegans from Indian waters; however, it has been included in OBIS Indo—Pacific Molluscan Database from the vicinity of these Islands at an earlier date. As no comprehensive literature on its occurrence from Indian waters exists, the current report confirms its occurrence and provides notes on its morphology from this region.
      PubDate: 2021-12-01
       
  • A Controlled Accuracy-Based Recursive Algorithm for Approximation of
           Sigmoid Activation

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      Abstract: The sigmoid activation function is widely used in the development of neural networks. It is implemented in hardware development using an approximation scheme. In this paper, a piecewise linear (PWL) approximation scheme is developed as an accuracy controlled recursive algorithm. It uses a maximum allowable error as an input parameter and the least square method for finding the PWL function. The algorithm’s accuracy is calculated with an absolute average and maximum error and compared to the state of the art. The approximation scheme’s hardware implementation complexity is compared in terms of the number of PWL functions required. Results show that the proposed algorithm requires comparatively fewer PWL functions for the approximate sigmoid function for the specified accuracy.
      PubDate: 2021-12-01
       
  • Integrated Farming System Model for Sustained Farm Income and Employment
           Generation Under Rainfed Vertisol of Southern Zone of Tamil Nadu

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      Abstract: The study on integrated farming system (IFS) was conducted during 2011–2017 at Agricultural Research Station, Kovilpatti, to find out economic viability of IFS model by changing in crop(s) or cropping system and integrating different livestock enterprises. The IFS model consisted of five crops or cropping systems, viz. sorghum (K-8) + cowpea (Co-7) (1:1) (0.40 ha), maize [CoH (m)-6] + greengram (Co-6) (1:1) (0.15 ha), cotton (KC-3) + blackgram (UBN-6) (1:1) (0.60 ha), clusterbean (local variety) (0.15), fodder crops [sorghum (COFS 29), Deshmanthus (local variety)] (0.30 ha) with dairy (1 cow + 1 calf of Sindi breed) and goatery (10 does + 1 buck of kanni breed) components in 1.60 ha total area. The results indicated that the IFS model is good enough to provide sustained average net income of ` 137,712/ha and employment of 389 man days/year as compared to conventional cropping systems (CCS) which gave average negative net income of ` 644/ha during 6 years of investigation due to deficit of rainfall. Thus, it is concluded that farm productivity and profitability as well as employment generation could be sustained by integrating different enterprises, i.e. dairy and goatery along with modified cropping systems in Southern Zone of Tamil Nadu.
      PubDate: 2021-12-01
       
  • Performance of Phosphate Solubilizing Bacteria in Tea (Camellia sinensis
           L.) Rhizosphere

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      Abstract: A pot experiment was conducted to assess the effect of phosphate solubilizing bacteria (PSB) on the availability of applied P in acid soil using tea (Camellia sinensis L. var. CP-1) as test crop. Six strains of PSB (Bacillus firmus strain TPB-1, Burkholderia sp. strain TPB-33, Bacillus firmus strain TPB-38, Burkholderia sp. strain TPB-40, Burkholderia cepacia strain TPB-52 and Burkholderia sp. strain TPB-57) were used for inoculation using liquid and charcoal-based delivery system. To assess the effect of PSBs on P solubilization, bacterial inocula were used with and without rock phosphate (RP) application. Results indicated that maximum P-uptake (15.6 mg/pot) in tea shoot was recorded in case of inoculation with Burkholderia sp. strain TPB-57 using charcoal-based delivery system (T12-TPB 57C). As far as the crop response is concerned, the highest biomass yield of test crop (10.5 g/pot) was also recorded with T12-TPB 57C in the presence of RP. The study indicates that as far as P solubilization by PSB in tea rhizosphere is concerned, Burkholderia sp. strain TPB-57 is an efficient microbial genus.
      PubDate: 2021-12-01
       
  • Isolation, Identification and Characterisation of Fungal Endophytes from
           Plectranthus amboinicus L.

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      Abstract: Fungal endophytes of Plectranthus amboinicus L. were explored for their antifungal activity against phytopathogen Sclerotinia sclerotiorum and plant-growth-enhancing traits. Fungal isolates were genotyped using the ITS-rDNA regions. Chaetomium subglobosum exhibited the highest mycelial growth inhibition of 80% against phytopathogen Sclerotinia sclerotiorum in dual-culture bioassay carried out in czapek dox medium. Of the various plant-growth-enhancing traits evaluated in endophytic isolates, C. subglobosum was found to be positive for HCN, IAA, siderophore and ammonia production. None of the endophytic isolates were able to solubilise phosphate in in vitro conditions. IAA was produced by C. subglobosum, Alternaria alternata and Fusarium oxysporum as characterised qualitatively by RP-HPLC. Highest quantity of IAA (97 ng/ml) was secreted by Fusarium oxysporum as detected through spectrophotometric analysis at 530 nm.
      PubDate: 2021-12-01
       
  • Efficient Approach of Analyzing and Generating Intrinsic Information from
           Weblog

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      Abstract: The weblog data have unstructured data, and due to this extraction, the desired information from it is a very challenging task. This kind of data is rapidly growing with huge volume. In this paper, the weblog analysis through Pyspark (WAP) algorithm is proposed to analyze the complete weblog dataset and extract useful information from it. In the proposed approach is used Resilient Distributed Dataset (RDD) for running and operating on multiple nodes to do parallel processing on a cluster; for achieving these concepts is used apache pyspark and implemented on jupyter notebook. WAP extracts different results such as host count, path count, status count, etc. This approach also generates patterns and track user behavior. The recommendation is also possible by the proposed algorithm based on user behaviors.
      PubDate: 2021-12-01
       
  • Scientific and Medical Research Support can Increase Export Earnings from
           Turmeric (Curcuma longa)

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      Abstract: India, the world's largest producer and exporter of turmeric accounts for about 80% of global production. With the exports recorded at US 236 million dollars in 2018, turmeric has rightly been called as Indian Gold. It is cultivated in many states including Tamil Nadu, Andhra Pradesh, Odisha, West Bengal and Assam. However, the yields are low and can be increased by agricultural research. Also, to maintain a consistent position on top in international market scientific research is needed to quantify its main ingredient, the Curcumin, and any other ingredient of importance. Medical research is needed to prove its importance in curing several diseases for which claims have been made. Marketing pure ingredients as medicines can fetch more foreign exchange than marketing crude turmeric. However, turmeric-based research and development certainly needs utmost attention to earn the foreign money.
      PubDate: 2021-12-01
       
  • Global Forestry Perspective: COVID-19 Impact and Assessment

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      Abstract: Corona virus disease 2019 (COVID-19) caused by corona virus SARS-CoV-2 is believed to be originated in Wuhan province of China, which has spread all over the world. It has severely impacted the social, cultural, educational, research and development programmes throughout the globe. Since the inception of various lifeforms on planet earth, forests' plays an important role in the evolutionary history of organisms and fitness persuades the existence of modern-day species in different ecosystems. The visible effect of pandemic leads to the lockdown with positive implications on the earth biosphere as a whole; while on other hand, lockdown seized and reduced the urbanization and developmental projects, especially the research and development progress in the field of forestry and allied sciences. This viewpoint addresses key questions and point-out with detailed exploration of the problem — as how COVID-19 pandemic impacts forestry research all over the world' We also suggest possible solutions, and define the role and association of disciplines, such as bioinformatics, remote sensing and statistical modules along with previously explored and collected field data as a sustainable measure to resolve the problems of forestry sector of this mighty challenge.
      PubDate: 2021-12-01
       
  • Chromosomes in Speciation: Does the Chromosomes Number Really Matter in
           Diversification of Mosquitoes'

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      Abstract: Akin to classical taxonomy (based on comparative morphology), investigations on cytology of biological species related to chromosome studies are getting into oblivion and considered low priority, an expertise that is fast waning for everyone riding bandwagon in the era of molecular biology.
      PubDate: 2021-12-01
       
  • Performance Evaluation of SD-WDM System to Mitigate the Effect of XPM
           using HOA

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      Abstract: This paper has dealt with the mitigation effect of cross-phase modulation (XPM) which is a nonlinear effect of fiber losses. To control the losses, we have used a quantum dot vertical cavity semiconductor optical amplifier with vertical cavity semiconductor optical amplifier as hybrid optical amplifier (HOA). Further, an analysis of 560 channels with a data rate of 40 Gbps has been done to achieve the acceptable rating of gain, quality factor and noise figure. The final suggestion has recommended that the proposed HOA is most suitable to control the XPM with a received quality factor from 40 to 16 dB.
      PubDate: 2021-12-01
       
  • First Indian Soybean Variety Free from Off-Flavour Generating
           Lipoxygenase-2 Gene Identified for Release for Commercial Cultivation

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      Abstract: Soybean seed lipoxygenase-2 is the principal contributor to off-flavour associated with soy-products and constrains the utilization of soybean in food uses. A soybean genotype NRC132 genetically free from lipoxygenase-2 was developed through modified marker-assisted backcrossing by crossing climate-smart variety JS97-52 with null lipoxygenase-2 donor PI596540, an exotic germplasm accession. Null lipoxygenase-2 gene-specific marker and SSR marker linked to Lox2 locus were deployed for foreground selection and phenotyped through lipoxygenase-2 assay. The genotype was tested at multi-locations in Southern and Eastern zone in 2017, 2018, 2019 for yield and reaction to insect pests and diseases. The genotype yielded at par and significantly higher than the best performing check in Southern and Eastern zone, respectively, and showed resistance against potential diseases and insect pests at hotspots. Soy-milk produced from NRC132 gave reduced off-flavour. The genotype identified for release as variety holds potential to boost utilization of soybean in manufacturing food products.
      PubDate: 2021-12-01
       
  • Cytomixis-Associated Meiotic Anomalies in Diploid Mentha longifolia (L.)
           L. and their Impact on Pollen Viability and Size

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      Abstract: Existence of cytomixis and associated meiotic anomalies, their effect on pollen viability/size and factors influencing cytomixis have been described in many species but not in Mentha longifolia. Presently, meiotic analysis of four M. longifolia populations from varying altitudes of Jammu Province (Jammu and Kashmir, India) revealed cytomixis between 16.67 and 19.31% pollen mother cells (PMCs) in three populations (considered cytomictic) and in 3.43% cells in the fourth one (named control). For each population, the frequency of cytomictic cells valued nearly same irrespective of the type of anthers (fresh/fixed) used and season (peak blooming/offseason) of their collection indicating that cytomixis is not influenced by seasonal variations/fixative treatment. To determine whether/not cytomixis in present populations is associated with numerical or structural chromosomal variations, meiocytes were scrutinized for chromosome count and behaviour. While PMCs of control population contained diploid chromosomes (2n = 24) exhibiting regular behaviour, 4.73 to 11.27% cells of cytomictic populations were aneuploid (2n = 22, 25 and 26)/nearly haploid (2n = 14)/polyploid (2n = 42/44) or had multivalents. In later populations, the presence of 17–19% cytomictic and 7.52–11.27% cytologically deviant cells accounted for low pollen viability (33.19–37.27%), with some of viable pollens (16.92 to 20%) being larger/smaller than normal one. However, control population containing few (3.43%) cytomictic cells exhibited high pollen viability (61.78%). In M. longifolia, finding of connected cells in all the four populations for two consecutive years points towards natural occurrence of cytomixis and is not a fortuitous event. Nevertheless, variation in the frequency of cytomictic cells in different populations seems to have some connection with environmental conditions where they were growing.
      PubDate: 2021-12-01
       
  • Biocompatible Silver Nanoparticles-Loaded Fungal Metabolites Nanoconjugate
           (AgNp–FM) Preparation for the Noteworthy Pesticidal Activity

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      Abstract: In the present investigation, the enhanced pesticidal activity of fungal-based pesticidal metabolites extracted from a well-known fungal biocontrol agent biogenic silver nanoparticles–fungal-based insecticidal metabolite (AgNp–FM) was evaluated against major lepidopteron pest Spodoptera litura (Fab.). Nanoconjugate was prepared from silver nanoparticles–pesticidal metabolites extracted from Nomuraea rileyi; adopting in vitro green science principles reveals highly stable, amorphous, monodispersive nanodimensional particles. Determination of pesticidal activity was studied by measuring pesticidal activity against major lepidopteron pest Spodoptera litura (Fab.). Nanoconjugate thus synthesised brought about notable mortality against all the larval instars. Developmental parameters were also highly affected in nanoconjugate treatment. High efficacy of the nanoconjugate thus obtained would suggest the possible utilisation of nanoconjugate as an effective, safe pesticidal agent against economically important insect pests.
      PubDate: 2021-12-01
       
  • A Low Complexity Detector for Massive MIMO Uplink Systems

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      Abstract: Fifth generation wireless communication system is implemented by several mobile companies where important technologies are employed such as the massive multiple-input multiple-output (MIMO). Although it improves the spectrum and energy efficiencies, it is not a trivial to propose an efficient detector for massive MIMO systems because a large number of antennas increases the computational complexity. In this paper, approximate message passing (AMP) is exploited in the massive MIMO uplink (UL) data detection. Although the AMP method is suffering from a considerable performance in special cases, an efficient selection of the initial solution affects greatly the convergence rate, the bit-error-rate performance, and the computational complexity. In this paper, three efficient initialization methods of the AMP-based massive MIMO UL detector are proposed based on iterative methods, namely, the successive overrelaxation, the Gauss–Seidel, and the Jacobi. In addition, a stair matrix is exploited to achieve high convergence rate. Numerical results show that the proposed detector achieved a considerable performance improvement and complexity reduction in comparison with the traditional AMP-based detector.
      PubDate: 2021-12-01
       
 
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