Showing posts with label Iran.. Show all posts
Showing posts with label Iran.. Show all posts

Listeria Detection in Crayfish: PCR-Based Study in Iran | InformativeBD

Prevalence of Listeria monocytogenes in the crayfish (Astacus leptodactylus) by polymerase chain reaction in Iran

Faham Khamesipour, Amin Khodadoustan Shahraki, Manouchehr Moumeni,  Reza Khadivi Boroujeni, and Mehrdad Yadegari, from the institute of Iran. wrote a Research article about, Listeria Detection in Crayfish: PCR-Based Study in Iran. entitled, Prevalence of Listeria monocytogenes in the crayfish (Astacus leptodactylus) by polymerase chain reaction in Iran. This research paper published by the  International Journal of Biosciences | IJBan open access scholarly research journal Biosciences. under the affiliation of the International Network For Natural Sciences| INNSpub. an open access multidisciplinary research journal publisher.

Abstract

The Crayfish are the largest freshwater crustacean via high skill opposite wide range of environment variables and The freshwater Crayfish Astacus leptodactylus (A. leptodactylus) is the one of the important species of Crayfish family that rearing it significant in several nations . Iran has a significant role in export of A. leptodactylus to European nations. A number of species have been used aquaria and some use seafood consumer. Listeriosis have become an important topic in biomedical research because of its central role in food microbiology and medical microbiology. In Iran, some reports is available on prevalence of Listeria spp. in A. leptodactylus. The aim of this study was to find the prevalence of Listeria monocytogenes in A. leptodactylus meat samples in Iran. From November 2012 to February 2013, a total of 40 meat samples of A. leptodactylus samples were obtained from randomly selected localities in “Aras Dam” , Western-Azerbaijan Province , Iran. The samples were tested for the presence of L. monocytogenes using Polymerase Chain Reaction (PCR). Three samples (7.5%) were positive for L. monocytogenes by PCR method. The results show that crayfish from the studied area regularly contain this pathogen that is important to public health. Consumption of these sea foods, either raw or undercooked, may give to food borne illness in Iran.

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Introduction

The Crayfish are the largest freshwater crustacean via high skill opposite wide range of environment variables and The freshwater Crayfish Astacus leptodactylus (A. leptodactylus) is the one of the important species of Crayfish family that rearing it significant in several nations (McMahon, 1986; Holdich et al., 1997).Iran has a significant role in export of A. leptodactylus to European nations. At the moment, England, Germany, Sweden and France are the main importers of crayfish from Iran (Matinfar, 2007). A number of species have been used for aquaculture aim and more in recent times, there has been an increase in the sale of crayfish for aquaria and some use seafood consumer in the world (Alderman and Polglase, 1988).

Listeriosis is a significant bacterial infection make happen via a gram positive facultative anaerobe, rodshaped, non-spore-forming and intracellular bacteria (Gawade et al., 2010). The bacteria Listeria spp. have become an important topic in biomedical research because of their central role in food and medical microbiology. The genus Listeria is composed of six species: L. monocytogens, L. innocua, L. grayi, L. ivanovii, L. seeligeri, and L. welshimeri. L. monocytogenes is the most important human pathogen among Listeria spp , even though very rare cases of infection because of L. seeligeri and L. ivanovii have been described (Mclauchlin, 1997; Guillet et al., 2010). The existence of any Listeria species in food is possibly an indicator of poor hygiene. However, since L. monocytogenes is the major human pathogen, there is widespread agreement that the goal should be to exclude this organism from the food chain wherever possible, and to keep up conditions that will inhibit its multiplication in foods in which This organism is an acute and regularly fatal illness by clinical manifestations resembling sepsis or meningitis in immunocompromised patients and neonatal babies and flu-like illness or abortion during pregnancy in women, encephalitis, gastroenteritis,  this bacterium can grow (Wyller et al., 1999; Rocurt et al., 2000).

arthritis and conjunctivitis (Vázquez-Boland et al., 2001; Delgado, 2008). In ruminants, listeriosis is characterized as encephalitis presentation typical ’circling’ symptoms, conjunctivitis, stillbirth, third trimester abortion, etc. (Hoelzer et al., 2012). The case-fatality rate from listeriosis is usually about 20– 30% (Farber and Peterkin, 1991). Its public health importance lies in its presence everywhere in nature that shows clearly its wide host range, which includes 40 mammals, 20 birds, crustaceans, fishes and ticks (Gawade et al., 2010). This pathogen is generally distributed in nature and is commonly transmitted to human through contaminated water and food (Kuhn et al., 1988). Biofilm formation on food-contact surfaces via this pathogen is a sign of severe public health hazards (Zameer et al., 2010). L. monocytogenes is one of very few pathogenic organisms which can grow at frozen temperatures. Consequently, the storage of food at low temperatures don't growth of this pathogen (Junttila et al., 1988). Most important occurrences of listeriosis have been associated by the consumption of foods of animal origin (Iida et al., 1998; Rocourt et al., 2000), specially sea foods, for example shrimp, mussels and undercooked fish (Brett et al., 1998; Wan Norhana et al., 2010).

Since fish and fishery products are perhaps a vehicle for L. monocytogenes, it is significant to have data on the prevalence of this pathogen. L. monocytogenes has been isolated often from fish and fish products from different parts of the world (Hassan et al., 2001; Mena et al., 2004; Basti et al., 2006; Parihar et al., 2008; Wan Norhana et al., 2010). Therefore, regular screening and constant surveillance of food products including seafood for the presence of this pathogen are required. PCR is a technique which possesses sensitivity, rapidity and specificity and could be employed to help rapid diagnosis of L. monocytogenes contamination (Rahimi et al., 2012). Therefore, it is considered that DNA extraction and PCR could become a practical difference to the conventional techniques for detection of L. monocytogenes (Rahimi et al., 2012 ). The current study deals by the isolation and confirmation of L.

monocytogenes from sea foods by rapid, reliable and simple PCR method. In Iran, there are not many reports is available on prevalence of Listeria spp. among crayfish (Astacus leptodactylus), but is available on prevalence of Listeria spp. in several works on other foods, specially sea foods. The aim of the current study was to study prevalence of L. monocytogenes in A. leptodactylus using PCR, in Iran.

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Article source : Prevalence of Listeria monocytogenes in the crayfish (Astacus leptodactylus) by polymerase chainreaction in Iran  

Plant-Parasitic Nematodes in Peanut Fields | InformativeBD

Field symptoms showing patchy distribution of damage caused by groundnut plants infected byHeterodera cruciferea.

Seyede Negin Mirghasemi, Mina neginfar, Salar Jamali , Mina Allamoradi  and Amaneh Hosseinikhah Choshali from the different institute of the Iran, wrote a research article about, Plant-Parasitic Nematodes in Peanut Fields, entitled,  "Reported some species of plant parasitic nematodes from rhizosphere of peanut (Arachis ypogaea) fields". This research paper published by the International Journal of Mycrobiology and Mycology | IJMM. an open access scholarly research journal on Mycrobiology, under the affiliation of the International Network  For Natural Sciences | INNSpub. an  open access multidisciplinary research journal publisher.

Abstract

In order to identify of peanut fields plants parasitic nematodes, 130 samples of soil around the roots of peanut plants were collected in province of Guilan, during the summer and fall of 2011. After extraction, killing, fixation and transferring to anhydrous glycerol, the nematodes were mounted on permanent microscopic slides and nematodes species identified by using light microscope, equipped with digital camera, based on morphological and morphometric characters using valid keys. In this study 20 species belonging 17 genera were identified, that are as followes: 1- Aphelenchoides sacchari 2-Aphelenchus avenae 3- Basiria graminophila 4-Coslenchus costatus 5-Ditylenchus myceliophagus 6-Filenchus vulgaris 7-Helicotylenchus digonichus 8-Heterodera cruciferae 9-Meloidogyne incognita 10-Meloidogyne hapla 11-Merlinius bavaricus 12- Mesocriconemarusticum13- Mesocriconema curvatum 14-Paratylenchus nanus 15-Pratylenchus neglectus 16- Psilenchus hilarulus 17-Quinsulcius capitatus 18-Tylenchorhynchus annulatus 19- Tylenchorhynchus mashhoodi 20- Tylenchus davainei. In thisstudy, 20 species belonging 17 genera were identified that before just 6 Species2-5-7-11-15-16were reported from rhizosphere of Peanut in Iran. Other species (14 Species) are going to report from rhizosphere of Peanut in Iran as a first.

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Introduction

Arachis hypogaea, the peanut or groundnut, is an annual herbaceous plant in the Fabaceae (legume or bean family), with high protein content, vitamins and useful mineral compounds. Total commercial production of peanuts worldwide was 37.6 million tons, harvested from 24.1 million hectares, in 2010. Iran cultivated area The most under cultivating area is located in Guilan province of Iran as 90 present of peanut crop were cultivated in this area (Anon,2012).

Reported some species of plant parasitic nematodes from rhizosphere of peanut (Arachis ypogaea) fields

Peanut Arachis hypogaea is considered one of the important food crops, produced in many subtropical and tropical countries; also it is a high value cash crop for small and large growers alike. It was listed as one of the twenty crop plants that stand between man and starvation (Wittwer, 1981). Numerous nematode species can damage peanut.(Minton &Baujard, 1990).Several plant parasitic nematodes were reported from peanut fields in South Eastern States of USA such as Belolaimus longicaudatus, Meloidogyne hapla, Meloidogyne arenaria, Mesocriconema ornatum and Pratylenchus brachyurus (Barker, 1992). Peanut root–knot nematode Meloidogyne arenaria is considered one of the most serious nematode pathogens of peanut in many parts of the world, attacking peanut roots, pegs and pods and causing substantial yield losses in severely infested fields (Minton & Baujard, 1990). Meloidogyne arenaria and M. hapla are the most important peanut crop loss agent in USA, which their populations have reached as economically damaging threshold (Hirunsalee et al.,1995). Elekcioglu et al. (1994) also have reported many species Aphelenchus avenae, Ditylenchus myceliophagus, D. valveus, Pratylenchus thornei, Tylenchorhynchus goffartri from peanut fields in the east mediterranean region of Turkey.

Reported some species of plant parasitic nematodes from rhizosphere of peanut (Arachis ypogaea) fields

In order to improve cultivating steps in peanut and prevent the decline of peanut crop production in traditional cultures, the need to identify plant pathogens, is the first and most important step in disease management. Since the yield loss associated with plant pathogens including plant parasitic nematodes, this study aims to investigate the peanut nematodes.

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 Source: Reported some species of plant parasitic nematodes from rhizosphere of peanut (Arachis ypogaea) fields