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Hasnat H, Shompa SA, Islam MM, Alam S, Richi FT, Emon NU, Ashrafi S, Ahmed NU, Chowdhury MNR, Fatema N, Hossain MS, Ghosh A, Ahmed F. Flavonoids: A treasure house of prospective pharmacological potentials. Heliyon 2024; 10:e27533. [PMID: 38496846 PMCID: PMC10944245 DOI: 10.1016/j.heliyon.2024.e27533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Revised: 02/29/2024] [Accepted: 03/01/2024] [Indexed: 03/19/2024] Open
Abstract
Flavonoids are organic compounds characterized by a range of phenolic structures, which are abundantly present in various natural sources such as fruits, vegetables, cereals, bark, roots, stems, flowers, tea, and wine. The health advantages of these natural substances are renowned, and initiatives are being taken to extract the flavonoids. Apigenin, galangin, hesperetin, kaempferol, myricetin, naringenin, and quercetin are the seven most common compounds belonging to this class. A thorough analysis of bibliographic records from reliable sources including Google Scholar, Web of Science, PubMed, ScienceDirect, MEDLINE, and others was done to learn more about the biological activities of these flavonoids. These flavonoids appear to have promising anti-diabetic, anti-inflammatory, antibacterial, antioxidant, antiviral, cytotoxic, and lipid-lowering activities, according to evidence from in vitro, in vivo, and clinical research. The review contains recent trends, therapeutical interventions, and futuristic aspects of flavonoids to treat several diseases like diabetes, inflammation, bacterial and viral infections, cancers, and cardiovascular diseases. However, this manuscript should be handy in future drug discovery. Despite these encouraging findings, a notable gap exists in clinical research, hindering a comprehensive understanding of the effects of flavonoids at both high and low concentrations on human health. Future investigations should prioritize exploring bioavailability, given the potential for high inter-individual variation. As a starting point for further study on these flavonoids, this review paper may promote identifying and creating innovative therapeutic uses.
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Affiliation(s)
- Hasin Hasnat
- Department of Pharmacy, State University of Bangladesh, 77 Satmasjid Road, Dhanmondi, Dhaka, 1207, Bangladesh
| | - Suriya Akter Shompa
- Department of Pharmacy, State University of Bangladesh, 77 Satmasjid Road, Dhanmondi, Dhaka, 1207, Bangladesh
| | - Md. Mirazul Islam
- Department of Pharmacy, State University of Bangladesh, 77 Satmasjid Road, Dhanmondi, Dhaka, 1207, Bangladesh
| | - Safaet Alam
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Dhaka, Dhaka, 1000, Bangladesh
- Drugs and Toxins Research Division, BCSIR Laboratories Rajshahi, Bangladesh Council of Scientific and Industrial Research, Rajshahi, 6206, Bangladesh
| | - Fahmida Tasnim Richi
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Dhaka, Dhaka, 1000, Bangladesh
| | - Nazim Uddin Emon
- Department of Pharmacy, Faculty of Science and Engineering, International Islamic University Chittagong, Chittagong, 4318, Bangladesh
| | - Sania Ashrafi
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Dhaka, Dhaka, 1000, Bangladesh
| | - Nazim Uddin Ahmed
- Drugs and Toxins Research Division, BCSIR Laboratories Rajshahi, Bangladesh Council of Scientific and Industrial Research, Rajshahi, 6206, Bangladesh
| | | | - Nour Fatema
- Department of Microbiology, Stamford University Bangladesh, Dhaka, 1217, Bangladesh
| | - Md. Sakhawat Hossain
- Pharmaceutical Sciences Research Division, BCSIR Dhaka Laboratories, Bangladesh Council of Scientific and Industrial Research (BCSIR), Dr. Qudrat-I-Khuda Road, Dhanmondi, Dhaka, 1205, Bangladesh
| | - Avoy Ghosh
- Department of Pharmacy, Faculty of Pharmacy, University of Dhaka, Dhaka, 1000, Bangladesh
| | - Firoj Ahmed
- Department of Pharmacy, Faculty of Pharmacy, University of Dhaka, Dhaka, 1000, Bangladesh
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Jobaer MA, Ashrafi S, Ahsan M, Hasan CM, Rashid MA, Islam SN, Masud MM. Phytochemical and Biological Investigation of an Indigenous Plant of Bangladesh, Gynura procumbens (Lour.) Merr.: Drug Discovery from Nature. Molecules 2023; 28:molecules28104186. [PMID: 37241926 DOI: 10.3390/molecules28104186] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 05/11/2023] [Accepted: 05/13/2023] [Indexed: 05/28/2023] Open
Abstract
Gynura procumbens (Lour.) Merr. (Family: Asteraceae) is a tropical Asian medicinal plant found in Thailand, China, Malaysia, Indonesia, and Vietnam. It has long been utilized to treat a variety of health concerns in numerous countries around the world, such as renal discomfort, constipation, diabetes mellitus, rheumatism, and hypertension. The chemical investigation resulted in the isolation and characterization of six compounds from the methanol (MeOH) extract of the leaves of Gynura procumbens, which were identified as phytol (1), lupeol (2), stigmasterol (3), friedelanol acetate (4), β-amyrin (5), and a mixture of stigmasterol and β-sitosterol (6). In-depth investigations of the high-resolution 1H NMR and 13C NMR spectroscopic data from the isolated compounds, along with comparisons to previously published data, were used to clarify their structures. Among these, the occurrence of Compounds 1 and 4 in this plant are reported for the first time. The crude methanolic extract (CME) and its different partitionates, i.e., petroleum ether (PESF), chloroform (CSF), ethyl acetate (EASF), and aqueous (AQSF) soluble fractions, were subjected to antioxidant, cytotoxic, thrombolytic, and anti-diabetic activities. In a DPPH free radical scavenging assay, EASF showed the maximum activity, with an IC50 value of 10.78 µg/mL. On the other hand, CSF displayed the highest cytotoxic effect with an LC50 value of 1.94 µg/mL compared to 0.464 µg/mL for vincristine sulphate. In a thrombolytic assay, the crude methanolic extract exhibited the highest activity (63.77%) compared to standard streptokinase (70.78%). During the assay for anti-diabetic activity, the PESF showed 70.37% of glucose-lowering activity, where standard glibenclamide showed 63.24% of glucose-reducing activity.
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Affiliation(s)
- Md Abu Jobaer
- Phytochemical Research Laboratory, Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Dhaka, Dhaka 1000, Bangladesh
| | - Sania Ashrafi
- Phytochemical Research Laboratory, Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Dhaka, Dhaka 1000, Bangladesh
| | - Monira Ahsan
- Phytochemical Research Laboratory, Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Dhaka, Dhaka 1000, Bangladesh
| | - Choudhury Mahmood Hasan
- Phytochemical Research Laboratory, Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Dhaka, Dhaka 1000, Bangladesh
| | - Mohammad Abdur Rashid
- Phytochemical Research Laboratory, Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Dhaka, Dhaka 1000, Bangladesh
| | - Sheikh Nazrul Islam
- Institute of Nutrition and Food Science, University of Dhaka, Dhaka 1000, Bangladesh
| | - Mohammad Mehedi Masud
- Phytochemical Research Laboratory, Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Dhaka, Dhaka 1000, Bangladesh
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Ashrafi S, Alam S, Sultana A, Raj A, Emon NU, Richi FT, Sharmin T, Moon M, Park MN, Kim B. Papaverine: A Miraculous Alkaloid from Opium and Its Multimedicinal Application. Molecules 2023; 28:molecules28073149. [PMID: 37049912 PMCID: PMC10095881 DOI: 10.3390/molecules28073149] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 03/28/2023] [Accepted: 03/29/2023] [Indexed: 04/05/2023] Open
Abstract
The pharmacological actions of benzylisoquinoline alkaloids are quite substantial, and have recently attracted much attention. One of the principle benzylisoquinoline alkaloids has been found in the unripe seed capsules of Papaver somniferum L. Although it lacks analgesic effects and is unrelated to the compounds in the morphine class, it is a peripheral vasodilator and has a direct effect on vessels. It is reported to inhibit the cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) phosphodiesterase in smooth muscles, and it has been observed to increase intracellular levels of cAMP and cGMP. It induces coronary, cerebral, and pulmonary artery dilatation and helps to lower cerebral vascular resistance and enhance cerebral blood flow. Current pharmacological research has revealed that papaverine demonstrates a variety of biological activities, including activity against erectile dysfunction, postoperative vasospasms, and pulmonary vasoconstriction, as well as antiviral, cardioprotective, anti-inflammatory, anticancer, neuroprotective, and gestational actions. It was recently demonstrated that papaverine has the potential to control SARS-CoV-2 by preventing its cytopathic effect. These experiments were carried out both in vitro and in vivo and require an extensive understanding of the mechanisms of action. With its multiple mechanisms, papaverine can be considered as a natural compound that is used to develop therapeutic drugs. To validate its applications, additional research is required into its precise therapeutic mechanisms as well as its acute and chronic toxicities. Therefore, the goal of this review is to discuss the major studies and reported clinical studies looking into the pharmacological effects of papaverine and the mechanisms of action underneath these effects. Additionally, it is recommended to conduct further research via significant pharmacodynamic and pharmacokinetic studies.
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Affiliation(s)
- Sania Ashrafi
- Department of Pharmaceutical Chemistry, University of Dhaka, Dhaka 1000, Bangladesh
| | - Safaet Alam
- Department of Pharmaceutical Chemistry, University of Dhaka, Dhaka 1000, Bangladesh
- Drugs and Toxins Research Division, BCSIR Laboratories Rajshahi, Bangladesh Council of Scientific and Industrial Research, Rajshahi 6206, Bangladesh
| | - Arifa Sultana
- Department of Pharmaceutical Chemistry, University of Dhaka, Dhaka 1000, Bangladesh
| | - Asef Raj
- Department of Pharmaceutical Chemistry, University of Dhaka, Dhaka 1000, Bangladesh
| | - Nazim Uddin Emon
- Department of Pharmacy, Faculty of Science and Engineering, International Islamic University Chittagong, Chittagong 4318, Bangladesh
- Department of Chemistry and Biochemistry, Cell and Molecular Biology Program, University of Arkansas, Fayetteville, AR 72701, USA
| | - Fahmida Tasnim Richi
- Department of Pharmaceutical Chemistry, University of Dhaka, Dhaka 1000, Bangladesh
| | - Tasnuva Sharmin
- Department of Pharmaceutical Chemistry, University of Dhaka, Dhaka 1000, Bangladesh
| | - Myunghan Moon
- Department of Pathology, College of Korean Medicine, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Moon Nyeo Park
- Department of Pathology, College of Korean Medicine, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Bonglee Kim
- Department of Pathology, College of Korean Medicine, Kyung Hee University, Seoul 02447, Republic of Korea
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Islam MA, Ashrafi S, Rahman KM, Ahmed S, Molla Jamal AHMSI, Ahsan M. Isolation and Characterization of One New Natural Compound with Other Potential Bioactive Secondary Metabolites from Glycosmis cyanocarpa (Blume) Spreng. (Family: Rutaceae). Molecules 2023; 28:molecules28052207. [PMID: 36903452 PMCID: PMC10005784 DOI: 10.3390/molecules28052207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 02/12/2023] [Accepted: 02/14/2023] [Indexed: 03/06/2023] Open
Abstract
Glycosmis cyanocarpa (Blume) Spreng is a plant in the Rutaceae family and a species in the Glycosmis genus that has received little attention. Therefore, this research aimed to report the chemical and biological analysis of Glycosmis cyanocarpa (Blume) Spreng. The chemical analysis involved the isolation and characterization of secondary metabolites through an extensive chromatographic study, and the structures of these metabolites were elucidated on the basis of a detailed analysis of NMR and HRESIMS spectroscopic data and by comparison with those of related compounds reported in the literature. Different partitions of the crude ethyl acetate (EtOAc) extract were evaluated for antioxidant, cytotoxic, and thrombolytic potentials. In chemical analysis, one new phenyl acetate derivative, namely 3,7,11,15-tetramethylhexadec-2-en-1-yl 2-phenylacetate (1), along with four known compounds N-methyl-3-(methylthio)-N-(2-phenylacetyl) acrylamide (2), penangin (3), β-Caryophyllene oxide (4), and acyclic diterpene-phytol (5) were isolated for the first time from the stem and leaf of the plant. The ethyl acetate fraction showed significant free radical scavenging activity with an IC50 value of 11.536 µg/mL compared to standard ascorbic acid (4.816 µg/mL). In the thrombolytic assay, the dichloromethane fraction showed the maximum thrombolytic activity of 16.42% but was still insignificant compared to the standard streptokinase (65.98%). Finally, in a brine shrimp lethality bioassay, the LC50 values of dichloromethane, ethyl acetate, and aqueous fractions were found to be 0.687 µg/mL, 0.805 µg/mL, and 0.982 µg/mL which are significant compared to the standard vincristine sulfate of 0.272 µg/mL.
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Affiliation(s)
- Md. Ariful Islam
- Department of Pharmaceutical Chemistry, University of Dhaka, Dhaka 1000, Bangladesh
| | - Sania Ashrafi
- Department of Pharmaceutical Chemistry, University of Dhaka, Dhaka 1000, Bangladesh
- Correspondence: (S.A.); (M.A.)
| | - Khondaker Miraz Rahman
- School of Cancer and Pharmaceutical Science, King’s College London, 150 Stamford Street, London SE1 9NH, UK
| | - Shamim Ahmed
- Institute of National Analytical Research and Service (INARS), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka 1205, Bangladesh
| | - A. H. M. Shofiul Islam Molla Jamal
- Institute of National Analytical Research and Service (INARS), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka 1205, Bangladesh
| | - Monira Ahsan
- Department of Pharmaceutical Chemistry, University of Dhaka, Dhaka 1000, Bangladesh
- Correspondence: (S.A.); (M.A.)
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Ashrafi S, Rahman M, Ahmed P, Alam S, Hossain MA. Prospective Asian plants with corroborated antiviral potentials: Position standing in recent years. Beni Suef Univ J Basic Appl Sci 2022; 11:47. [PMID: 35402627 PMCID: PMC8980796 DOI: 10.1186/s43088-022-00218-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 02/19/2022] [Indexed: 12/24/2022] Open
Abstract
Viral diseases are extremely widespread infections caused by viruses. Amongst numerous other illnesses, viral infections have challenged human existence severely. Over the history of mankind, new viruses have emerged and presented us with new tests. The range of viral infections varies from familiar infectious diseases such as the common cold, flu, and warts to severe ailments such as AIDS, Ebola, and COVID-19. The world has been racing to find an effective cure for the newly evolving viruses. Toxic effects, non-selectivity, drug resistance, and high price are the most common complications of conventional treatment procedures. Nature is a marvelous source of phytoconstituents with incredible varieties of biological activities. By tradition, medicinal plants have been utilized for the treatment of countless infectious diseases worldwide, some of which contain a broad spectrum of activities. Modern drug discovery and development techniques offer highly efficient separation techniques, inauguration of vector-based schemes where the original infectious virus is cloned to the non-infectious one for antiviral screening targets. The objective of the review was to gather available data on 20 both cultivated and native plants of Asia giving antiviral activities and provide comprehensive information on the phytochemical analysis of the plants and potential antiviral compounds isolated from these plants.
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Affiliation(s)
- Sania Ashrafi
- Department of Pharmacy, BRAC University, Mohakhali, Dhaka, 1212 Bangladesh
| | - Mamunur Rahman
- Department of Pharmacy, East West University, Aftabnagar, Dhaka, 1212 Bangladesh
| | - Pollob Ahmed
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Daffodil Smart City, Ashulia, Dhaka, Bangladesh
| | - Safaet Alam
- Department of Pharmacy, State University of Bangladesh, 77 Satmasjid road, Dhanmondi, Dhaka, 1205 Bangladesh
| | - Md Abid Hossain
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Daffodil Smart City, Ashulia, Dhaka, Bangladesh
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Ahmadi S, Ashrafi S, Yazdansetad F, Roshanshah N, Tarim UA, Gurler O. A computational modelling of low-energy gamma ray detection efficiency of a cylindrical NaI(Tl) detector. Radiat Phys Chem Oxf Engl 1993 2021. [DOI: 10.1016/j.radphyschem.2021.109581] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Hoffmeister M, Ashrafi S, Thines M, Maier W. Two new species of the Peronospora belbahrii species complex, Pe. choii sp. nov. and Pe. salviae-pratensis sp. nov., and a new host for Pe. salviae-officinalis. Fungal Syst Evol 2020; 6:39-53. [PMID: 32904171 PMCID: PMC7451775 DOI: 10.3114/fuse.2020.06.03] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
The downy mildew species parasitic to Mentheae are of particular interest, as this tribe of Lamiaceae contains a variety of important medicinal plants and culinary herbs. Over the past two decades, two pathogens, Peronospora belbahrii and Pe. salviae-officinalis have spread globally, impacting basil and common sage production, respectively. In the original circumscription of Pe. belbahrii, the downy mildew of coleus (Plectranthus scutellarioides) was ascribed to this species in the broader sense, but subtle differences in morphological and molecular phylogenetic analyses using two genes suggested that this pathogen would potentially need to be assigned to a species of its own. In the present study, Peronospora species causing downy mildew on members of the Mentheae, including clary sage (Salvia sclarea), meadow sage (S. pratensis), basil (Ocimum basilicum), ground ivy (Glechoma hederacea) and coleus (Plectranthus scutellarioides) were studied using light microscopy and molecular phylogenetic analyses based on six loci (ITS rDNA, cox1, cox2, ef1a, hsp90 and β-tubulin) to clarify the species boundaries in the Pe. belbahrii species complex. The downy mildew on Salvia pratensis is shown to be distinct from Pe. salviae-officinalis and closely related to Pe. glechomae, and is herein described as a new species, Pe. salviae-pratensis. The downy mildew on S. sclarea was found to be caused by Pe. salviae-officinalis. This is of phytopathological importance, because meadow sage thus does not play a role as inoculum source for common sage in the natural habitat of the former in Europe and Asia, while clary sage probably does. The multi-gene phylogeny revealed that the causal agent of downy mildew on coleus is distinct from Pe. belbahrii on basil, and is herein described as a new taxon, Pe. choii.
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Affiliation(s)
- M Hoffmeister
- Julius Kühn-Institut (JKI), Federal Research Centre for Cultivated Plants, Institute for Epidemiology and Pathogen Diagnostics, Messeweg 11-12, 38104 Braunschweig, Germany
| | - S Ashrafi
- Julius Kühn-Institut (JKI), Federal Research Centre for Cultivated Plants, Institute for Epidemiology and Pathogen Diagnostics, Messeweg 11-12, 38104 Braunschweig, Germany
| | - M Thines
- Goethe University, Faculty of Biological Sciences, Institute of Ecology, Evolution and Diversity, Max-von-Laue-Str. 13, 60438 Frankfurt am Main, Germany.,Senckenberg Biodiversity and Climate Research Centre, Senckenberganlage 25, 60325 Frankfurt am Main, Germany.,LOEWE-Centre for Translational Biodiversity Genomics, Georg-Voigt-Str. 14-16, 60325 Frankfurt am Main, Germany
| | - W Maier
- Julius Kühn-Institut (JKI), Federal Research Centre for Cultivated Plants, Institute for Epidemiology and Pathogen Diagnostics, Messeweg 11-12, 38104 Braunschweig, Germany
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Ahmadi N, Ahmadi A, Kheirali E, Hossein Yadegari M, Bayat M, Shajiei A, Amini AA, Ashrafi S, Abolhassani M, Faezi S, Yazdanparast SA, Mahdavi M. Systemic infection with Candida albicans in breast tumor bearing mice: Cytokines dysregulation and induction of regulatory T cells. J Mycol Med 2019; 29:49-55. [DOI: 10.1016/j.mycmed.2018.10.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 10/15/2018] [Accepted: 10/30/2018] [Indexed: 02/04/2023]
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Mohammadi A, Kaboli M, Ashrafi S, Mofidi‐Neyestanak M, Yousefi M, Rezaei A, Stuart Y. Trophic niche partitioning between two Rock Nuthatches (
Sitta tephronota
&
Sitta neumayer
) in a contact zone in Iran. J Zool (1987) 2016. [DOI: 10.1111/jzo.12329] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- A. Mohammadi
- Faculty of Natural Resources Department of Environmental Sciences University of Tehran Karaj Iran
| | - M. Kaboli
- Faculty of Natural Resources Department of Environmental Sciences University of Tehran Karaj Iran
| | - S. Ashrafi
- Faculty of Natural Resources Department of Environmental Sciences University of Tehran Karaj Iran
| | - M. Mofidi‐Neyestanak
- Insect Taxonomy Research Department Iranian Research Institute of Plant Protection Tehran Iran
| | - M. Yousefi
- Faculty of Natural Resources Department of Environmental Sciences University of Tehran Karaj Iran
| | - A. Rezaei
- Faculty of Natural Resources Department of Environmental Sciences University of Tehran Karaj Iran
| | - Y. Stuart
- Department of Integrative Biology University of Texas at Austin Texas USA
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Ashrafi S, Asadi M. On Ashrafi and Asadi (2014). J Appl Probab 2015. [DOI: 10.1239/jap/1429282625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Abstract
This paper is an investigation into the reliability and stochastic properties of three-state networks. We consider a single-step network consisting of n links and we assume that the links are subject to failure. We assume that the network can be in three states, up (K = 2), partial performance (K = 1), and down (K = 0). Using the concept of the two-dimensional signature, we study the residual lifetimes of the networks under different scenarios on the states and the number of failed links of the network. In the process of doing so, we define variants of the concept of the dynamic signature in a bivariate setting. Then, we obtain signature based mixture representations of the reliability of the residual lifetimes of the network states under the condition that the network is in state K = 2 (or K = 1) and exactly k links in the network have failed. We prove preservation theorems showing that stochastic orderings and dependence between the elements of the dynamic signatures (which relies on the network structure) are preserved by the residual lifetimes of the states of the network (which relies on the network ageing). Various illustrative examples are also provided.
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Ashrafi S, Helder J, van den Elsen S, Jansen M, Karssen G. First Report of Plant-Parasitic Nematode Meloidoderita salina in the Netherlands. Plant Dis 2014; 98:859. [PMID: 30708648 DOI: 10.1094/pdis-11-13-1117-pdn] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
After the description of the root-parasitic nematode Meloidoderita salina from a tidal salt marsh in France (1), an additional sampling was carried out to search for the presence of this unusual nematode in a tidal salt marsh area close to Sint-Annaland, Zeeland Province, the Netherlands. In August and October 2012, a total of 25 soil and root samples were collected from the halophytic plants Atriplex portulacoides L. (so far the only known host for this nematode species), A. littoralis L., A. prostrata Boucher ex DC., Limonium vulgare Mill., Salicornia europaea L., Aster tripolium L., and Plantago maritima L. All these halophytes grow in a cohesive muddy soil type within the salt marsh, except A. littoralis and A. prostrata, which grow in the litter tidal zones on the edges of this area. Nematodes from roots and soil were extracted by centrifugal flotation (2) and Oostenbrink's cotton-wool filter methods (4), respectively. Additionally, roots were used for direct observation of females and young cystoids with a dissecting microscope. Finally, all stages were compared morphologically with available type material (1). Root and soil samples demonstrated that only nematodes isolated from A. portulacoides, A. littoralis, and A. prostrata contained all life stages of the genus Meloidoderita, while on the roots of L. vulgare, S. europaea, A. tripolium, and P. maritima, no Meloidoderita was observed. The soil samples included males, cystoids, and second-stage juveniles (J2) in low densities (<20 nematodes/100 ml), while swollen females and young cystoids were observed on root samples. All stages (n = 10 per life stage) fit morphologically with the recently described M. salina. Females were swollen with an oval to pear shaped body with a small posterior protuberance, irregular and twisted neck, oval and backwardly sloping stylet knobs, a prominent secretory-excretory (S-E) pore with cuticular lobes, and a swollen uterus with a thick hyaline wall. Males were without stylet, strongly sclerotized S-E duct, and tail tapering to rounded terminus ending in one or two ventrally terminal mucron. J2s had a well-developed stylet and rounded knobs set off from shaft and conical tail slightly curved ventrally and tapering to a finely pointed terminus with a finger-like projection. Cystoids showing the unique sub-cuticular hexagonal beaded pattern (1). J2s were also used for molecular analysis. DNA was extracted by incubating individual J2s in a lysis buffer as described in (3). Two primer combinations were used to amplify the small subunit ribosomal DNA (SSU rDNA) from a 100-times-diluted crude lysate (two overlapping fragments, [3]). The resulting (nearly) full-length SSU-rDNA sequences (GenBank KF751617 and KF751618) showed >99% identity with M. salina sequences from nematodes collected in the aforementioned tidal salt marsh in France (FJ969126 and FJ969127). To our knowledge, this is the first report of M. salina in the Netherlands. Moreover, this is the first record of M. salina parasitizing A. littoralis and A. prostrata. Although these Atriplex species are used for human consumption, the effect of M. salina on the host is unknown so far. References: (1) S. Ashrafi et al. Zookeys 249:1, 2012. (2) W. A. Coolen. Pages 317-329 in: Root-knot nematodes (Meloidogyne species). Systematics, biology and control. Academic Press, New York, 1979. (3) Holterman et al. Mol. Biol. Evol. 23:1792, 2006. (4) M. Oostenbrink. Pages 85-102 in: Nematology. University of North Carolina Press, Chapel Hill, 1960.
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Affiliation(s)
- S Ashrafi
- CIMMYT (International Maize and Wheat Improvement Center), P.K. 39 06511, Emek, Ankara, Turkey
| | - J Helder
- Wageningen University, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - S van den Elsen
- Wageningen University, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - M Jansen
- National Plant Protection Organization, P.O. Box 9012, 6700 HC, Wageningen, The Netherlands
| | - G Karssen
- National Plant Protection Organization, P.O. Box 9012, 6700 HC, Wageningen, The Netherlands
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Ashrafi S, Bontadina F, Kiefer A, Pavlinic I, Arlettaz R. Multiple morphological characters needed for field identification of cryptic long-eared bat species around the Swiss Alps. J Zool (1987) 2010. [DOI: 10.1111/j.1469-7998.2010.00697.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Abstract
There is a quest to find a method to remove diseased and healthy dental hard tissues without the negative stimuli associated with dental handpieces. Today, lasers are being considered as a potential replacement. This report evaluates effects of three lasers on dentin and pulpal tissues. The Er:YAG laser appears to have a lesser thermal effect.
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Affiliation(s)
- H Wigdor
- Ravenswood Hospital Medical Center, Wilson, Chicago 60640
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Eisenmann DR, Ashrafi S, Zaki AE. Multi-method analysis of calcium localization in the secretory ameloblast. J Dent Res 1982; Spec No:1555-62. [PMID: 6958714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
X-ray micro-analysis and electron energy loss analysis were used to confirm cytochemical localization by potassium pyro-antimonate of calcium in secretory ameloblasts. Neither intercellular calcium concentration between ameloblasts nor over-all calcium levels of the enamel organ were lowered during a period of inhibition of enamel mineralization by injected fluoride. Calcium concentrations in mitochondria and secretory granules were reduced.
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Abstract
The distribution of calcium in the enamel organ of the rat incisor was investigated using potassium pyroantimonate for ultrastructural localization of calcium. Substantial amounts of precipitate occurred in the intercellular compartment of the enamel organ and modest deposits were observed in specific organelles of the secretory ameloblast. Mitochondria, nuclei granular endoplasmic reticulum, Golgi vesicles and secretory granules consistently contained small deposits of pyroantimonate. Complexing of calcium by the pyroantimonate was confirmed by EGTA decalcification and scanning electron microscope energy dispersive X-ray analysis. The observed distribution is discussed in light of potential for an intercellular pathway of calcium transport as well as controlled movement of the ion along the synthetic and secretory route followed by organic components of enamel.
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