5.Review (03)

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    RELATIONSHIP BETWEEN DROUGHT AND PREHARVEST AFLATOXIN CONTAMINATION IN GROUNDNUT (ARACHIS HYPOGAEA L.)
    (Wageningen Academic Publishers, 2018) Jeyaramraja, P R; Nithya Meenakshi, S; Woldesenbet, F
    Groundnut is a commercial oilseed crop that is prone to infection by Aspergillus flavus or Aspergillus parasiticus. Drought impairs the defence mechanism of the plant and favours the production of aflatoxin by the fungus. Aflatoxin is a carcinogen and its presence in food and feed causes significant economic loss. The answer to the question, ‘how drought tolerance and aflatoxin resistance are related?’ is not clear. In this review paper, the relationship of drought and preharvest aflatoxin contamination (AC), the relationship of drought tolerance traits and AC, and the approaches to enhance resistance to AC are discussed using up-to-date literature. Factors leading to AC are drought, high geocarposphere temperature, kernel/pod damage, and reduced phytoalexin synthesis by the plant. If the fungus colonises a kernel with reduced water activity, the plant cannot synthesise phytoalexin and then, the fungus synthesises aflatoxin. Breeding for resistance to AC is complicated because aflatoxin concentration is costly to measure, highly variable, and influenced by the environment. Since drought tolerant cultivars have resistance to AC, traits of drought tolerance have been used as indirect selection tools for reduced AC. The genetics of aflatoxin resistance mechanisms have not been made clear as the environment influences the host-pathogen relationship. Host-pathogen interactions under the influence of environment should be studied at molecular level to identify plant resistant factors using the tools of genomics, proteomics, and metabolomics in order to develop cultivars with durable resistance. Many candidate genes involved in host-pathogen interactions have been identified due to improvements in fungal expressed sequence tags, microarrays, and genome sequencing techniques. Moreover, research projects are underway on identifying genes coding for antifungal compounds, resistance associated proteins and quantitative trait loci associated with aflatoxin resistance. This review is expected to help those who wish to work on reducing AC in groundnuts.
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    LEUCAS ASPERA – A REVIEW OF ITS BIOLOGICAL ACTIVITY
    (Systematic Reviews in Pharmacy, 2018) Kulandaisamy, Agnes Nirmala; Marimuthu, Kanchana
    Herbal plants are integral parts of the traditional medicine worldwide and most of the rural and urban population uses these plants in many of their regular needs even today. The current researchers are more focused on natural chemicals than the synthetic chemicals due to their environmental, economical and health benefits. Plants produce many chemical compounds for its biological activities including defence mechanism against microbes, insects and herbivorous animals and these chemicals are called as phytochemicals. Herbal plants are a natural source of many important phytochemicals and widely used in Pharmaceutical, food and cosmetic industries. A wide variety of herbal plants are available in the Indian subcontinent and they are the backbone of Indian traditional medicines Ayurveda and Siddha. Leucas aspera Linn., commonly known as Thumbai or Dronpushpi is a small, erect, branched annual aromatic herb, distributed throughout India from the Himalayas down to Ceylon. Though it grows as a weed throughout the country, it has a number of medicinal values and it is used in traditional medicine to treat many diseases. The study of various biological properties of this plant will be useful for its potential use in respective industries. Medicinally, it has been proven to possess various pharmacological values like anti-fungal, anti-pyretic, antioxidant, antimicrobial, antinociceptive, analgesic, anti-diarrheal, insecticidal, anti-inflammatory and cytotoxic activity in a number of studies by different researchers in the past several years. The available reports on anti-microbial activity, anti-oxidant activity and pharmacological value of L. aspera are discussed in this review.
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    RECENT REVIEWS ON QUINOLINE DERIVATIVES AS CORROSION INHIBITORS
    (De Gruyte, 2018-02-21) Lavanya K; Saranya J; Chitra S
    Traditionally, controlling corrosion has been managed by various methods like cathodic protection, process control, reduction of the metal impurity content and application of surface treatment techniques as well as incorporation of suitable alloys. However, the use of corrosion inhibitors has proven to be the easiest and cheapest method for corrosion protection and prevention in acidic media. These inhibitors slow down the corrosion rate and thus prevent economic losses due to metallic corrosion on industrial vessels, equipment or surfaces. Many researchers have recently focused on corrosion prevention methods using organic inhibitors for mild steel in acidic solutions to mimic industrial processes. This paper arranges for an overview of types of corrosion, corrosion process and mainly recent work done on the application of quinolone derivatives as corrosion inhibitors for different metals