Search for Articles:
Journal:
Subject:

Search Filter

Years
Between: -
Article Types
Search Results (2768)
Order
page
文章
Rathod D. P., Brestic M., and Shao H. B., *
Abstract: Arbuscular mycorrhizal fungi, namely, Glomus mosseae and Glomus intraradices, and an endophyte, Piriformospora indica was used to assess the growth of two varieties (JS 335 and TAMS 98-21) of soybean (Glycine max L.) subjected to drought stress. Chlorophyll a fluorescence was measured by Handy PEA (plant efficiency analyzer) and analyzed by Biolyzer programme. The JIP-test (Chlorophyll a fluorescence rise at J I and P steps) was applied to evaluate in vivo vitality based on in vivo biospectroscopy, which supplied images, spectra and kinetics.We report that in JS-335 variety of soybean, G. intraradices induced the highest drought resistance followed by G. mosseae and P. indica, whereas in TAMS 98-21 variety, G. mosseae induced highest drought resistance followed by G. intraradices and P. indica.[...] Read More.
Keywords: Glomus mosseae, Glomus intraradices, Piriformospora indica, Glycine max L., arbuscular mycorrhizal.
Full text
Views:1368
Download:1464
文章
Najmedin Mortazavi, Rouh-Angiz Naderi, Nasrin Majidian, Behjat Naderi and Yavar Sharafi*
Abstract: Flowering is a complex morphological happening that occurs in apical meristem of stem. This investigation was carried out to study the effects of two hormones including gibberellin (GA) and benzyl adenine (BA) on calla cut flower production. The rhizomes were dipped in GA solution with concentrations include (0, 100, 200 and 500 ppm). BA with concentrations (0, 100, 200 and 500 ppm) was sprayed on flowering stems until flowering time. The results showed that maximum flower yield was obtained in GA solution with concentrations of 500 ppm followed by BA solutions (200 and 500 ppm). However; flowering in control plants was occurred earlier than other plants. Maximum flower weight (54/97 gr) was observed in treatment 200 ppm GA followed by 0 ppm BA and application of 500 ppm GA and 500 ppm BA resulted to minimum flower weight (38/09 gr). Interaction effects of two hormones were significant on chlorophyll content. The maximum chlorophyll content was observed when 500 ppm gibberellins and 500 ppm benzyl adenine were applied in the same time.[...] Read More.
Keywords: Calla lily, gibberellin, benzyl adenine, flower yield, chlorophyll content.
Full text
Views:1468
Download:1356
文章
S.  Vatandour*, M. Bozorgmehrifard, H. Shoushtari, S. Charkhkar and S. Bakhtiari
Abstract: Avian influenza (AI) outbreaks due to H9N2 subtype of avian influenza virus (AIV) occurred in poultry industry in Iran, throughout the past decade and caused serious economic losses as a result of decreased egg production, increased mortality and the cost of vaccination in Iranian poultry industry. Our aim was to find the phylogenic and genetic relationships among avian influenza viruses recently isolated from poultry in Iran with other Asian H9N2 lineages (1998-2007). The complete nucleotide sequences of the neuraminidase (NA) genes of ten H9N2 influenza virus strain isolated from diseased chickens in different farms in Iran during 1998-2007, were amplified and sequenced and phylogenetic relationships between these and previously reported N2 genes were investigated. The viruses surface glycoprotein genes was >90% similar to those of A/Quail/Hongkong/G1/97 (H9N2) lineage. The NA stalks regions in these viruses had no deletion or insertion or shortening as compared to that A/DK/HK/Y280/97 lineage (CK/Bei-like viruses) and the 2 human isolates A/HK/1073/99, A/HK/1074/99. The hemadsorbing site of NA had up to 3 amino acid substitution and is different from those of earlier Iranian viruses and ten Iranian isolates possessed seven potential glycosylation sites like the most H9N2 isolates. Phylogenetic analysis of NA gene showed that they belonged to the same A/Quail/Hong Kong/G1/97 like virus sub lineage.[...] Read More.
Keywords: Avian influenza virus, A/Quail/Hongkong/G1/97 (H9N2), neuraminidase gene, phylogenetic analysis, Iran.
Full text
Views:1341
Download:1346
文章
F. Mollaamin*, Sh. Momeni, M. Movahedi and M. Monajjemi
Abstract: Carbon nanotubes (CNTs) are very common in medical research and are being highly studied in the fields of biosensing methods for disease treatment and efficient drug delivery and health monitoring. The transportation of open-end Single wall carbon nanotube (SWCNT) through the cell membrane widely investigated because of many advantages. In our recent study, extensive quantum mechanical (QM) calculation of electronic structure of open-end of SWCNT and transportation of single wall carbon nanotube through the cell membrane have been administered in vacuum media using GAUSSIAN 98 software. Our results manifested that the interaction of open-end of SWCNT has minimum value of energy interaction and then most structural stability in vacuum. We assayed effects of vacuum on transportation of SWCNT through the cell membrane with using B1LYP and Hartree Fock (HF) methods at STO-3G, 3-21G, 6-31G levels of theory. Also, we demonstrated the total atomic charges of dense region calculated STO-3G, 3-21G and 6-31G basis sets in vacuum with HF method. The calculated values showed negative charge at this site. The O and S atoms at interaction site produced negative charge because they have high electron affinity.[...] Read More.
Keywords: Single wall carbon nanotube (SWCNT), quantum mechanical (QM), STO-3G, 3-21G and 6-31G basis.
Full text
Views:1345
Download:1351
文章
Salari Hassan*, Afzali Daryoush and Oliaie Mohammad Sadegh
Abstract: Bioremediation is a simple and effective technology for metal extraction from low-grade contaminated soils and mineral concentrates. Metal remove from sulfide minerals is based on the activity of mesophilic and chemolithotrophic bacteria, mainly ACIDITHIOBACILLUS FERROOXIDANS which convert insoluble metal sulfides into soluble metal sulfates. In this study bioremediation experiments carried out in 1 L Erlenmeyer flasks containing 300 ml basal medium of A. FERROOXIDANS and 5% (w/v) PbS with 45 and 75 meshes and also this condition repeated for ACIDITHIOBACILLUS THIOOXIDANS. The results showed that A. FERROOXIDANS had grown on the galena and obtained energy from it. Also, the galena was oxidized to form lead sulfate. The most important species for oxidizing galena concentrate showed A. FERROOXIDANS, because these species were more effective than A. THIOOXIDANS in our bioremediation experiments. Anglesite (PbSO4) was the important product of the galena bacterial oxidation. In these experiments the highest quantity of dissolute lead was 34% approximately in A. FERROOXIDANS cultures. The low solubility of lead sulphate indicated that this process is not commercially feasible for the recovery of lead on mines. In view of these results, bioremediation appears to have some potential for remediation of Pb contaminated soils.[...] Read More.
Keywords: Galena, acidithiobacillus ferrooxidans, acidithiobacillus thiooxidans, Ganat Marvan.
Full text
Views:1314
Download:1330
文章
Rose Koffi-Nevry*, Ama Lethicia Manizan, Kablan Tano, Yao Clément Yué Bi, Mathias K. Oulé and Marina Koussémon
Abstract: The antifungal activity of the Polyhexamethylene-guanidine hydrochloride (PHMGH)-based disinfectant against fungi isolated from papaya fruit was evaluated. The aim of this work was to show that the PHMGH can be used as a disinfectant for papaya preservation. Thirty one strains of fungi were isolated as Mucor sp., Botrytis sp., Penicillium sp., Geotrichum sp., Aspergillus sp. and Colletotrichum sp. Mucor sp. was the most isolated with a frequency of 52.77% followed by Botrytis (47.22%), Aspergillus and Penicillium (8.33%), Colletotrichum (5.56%) then, Geotrichum (2.78%). The antifungal activity of the PHMGH was tested through the determination of the minimal inhibitory concentrations (MICs) and the minimal fungicidal concentrations (MFCs). All the strains tested were sensitive to the disinfectant. However, the activity of PHMGH varies according to the strain tested. The values of the MIC and the MFC were between[...] Read More.
Keywords: Antifungal activity, minimum inhibitory concentrations (MICs), minimum fungicidal concentrations (MFCs), papaya preservation, polyhexamethylene-guanidine hydrochloride.
Full text
Views:1295
Download:1338
文章
N. Sri Kumaran, S. Bragadeeswaran* and S. Thangaraj
Abstract: The aim of this study was to screen the presence of antimicrobial activities in the marine mollusc Thais tissoti and Babylonia spirata. In this study, the human bacterial pathogen Klebsiella pneumonia (10.02 ± 0.11 mm) and fungal pathogen Aspergillus niger (12.09 ± 0.06 mm) showed most sensitive to ethyl acetate extracts of T. tissoti. In B. spirata extracts, bacterial pathogen Proteus mirabilis (7.02 ± 0.04 mm) and fungal pathogen Candida albicans (8.13 ± 0.15* mm) exhibit high zone of inhibition against n-butanol extracts. Among the fish bacterial pathogens assayed, Aeromonas hydrophila (9.22 ± 0.03* mm) and fungal pathogen Ichthyophonus sp. (5.21 ± 0.11 mm) showed more sensitivity to n- butanol extract of T. tissoti. In B. spirata extracts, bacterial pathogen A. hydrophila (11.2 ± 0.6* mm) and fungal pathogens A. niger (15.12 ± 0.23* mm) showed most sensitive to n-butanol extracts. From biofilm bacteria, Micrococcus luteus (7.02 ± 0.11* mm), Micrococcus sp. (7.25 ± 0.03* mm) showed high sensitivity to n-butanol extracts of molluscs T. tissoti and B. spirata. These results signify that the marine mollusc extracts express remarkable antimicrobial activity against isolated microbes. The result strongly suggests that the molluscs extracts can be used as antimicrobial agents and further studies for purification and structural elucidation of antimicrobial drugs.[...] Read More.
Keywords: Antibacterial, antifungal, human pathogen, fish pathogen, biofilm, marine mollusks.
Full text
Views:1343
Download:1358
文章
A. E. Ajiboye*, O. M. Kolawole, T. O. Oladosu, M. R. Adedayo and J. K. Akintunde
Abstract: Dried meat (Tinko) samples obtained from the Oja-Oba market in Ilorin metropolis during the rainy season were investigated for their microbial flora and the sensitivity of the bacterial isolates to different chemotherapeutic antibiotics under two different storage conditions (Cupboard and Refrigerator) for a period of five weeks revealed that the moisture content of dried meat samples stored in the cupboard increased from 35 to 65%, while those in the refrigerator had an initial increase from 50 to 55% for the first two weeks of storage and became constant through the period of storage. Bacteria and Fungi isolated include Staphylococcus aureus, Micrococcus luteus, Neisseria sp., Acinetobacter sp., Aspergillus niger, Aspergillus flavus, Penicillium sp. and Rhizopus sp. Bacterial isolates showed resistance to selected antibiotics (erythromycin, tetracycline, chloramphenicol, gentamycin, streptomycin, ofloxacin, nitrofurantoin, ciprofloxacin, azithromycin and clindamycin) except for Neisseria sp. which was sensitive to the antibiotics. The total bacterial count increased in the dried meat stored in the cupboard (2.5 × 107 to 3.3 × 107 cfu/ml) while it decreased in the meat samples stored in the refrigerator (2.0 × 107 to 1.4 × 107 cfu/ml).[...] Read More.
Keywords: Antibiotics, dried meat, bacteria, fungi, storage.
Full text
Views:1336
Download:1293
文章
Full Length Research Paper
Abstract: GB virus C (GBV-C)/hepatitis G virus (HGV) by infecting and encourage proliferative process of the mononuclear cells, may implicate in lymphomagenesis including non-Hodgkin’s lymphoma (NHL). Therefore, in this study the prevalence of GBV-C/HGV and HBV infections were evaluated in patients with NHL and controls. In a cross sectional study, blood samples were collected from 70 patients with NHL and 100 healthy controls. The infective markers of GBV-C/HGV and HBV viruses were evaluated in both studied groups by enzyme-linked immunosorbent assay (ELISA) and polymerase chain reaction (PCR) protocols, respectively. Anti-E2-Ab was detected in 1.4 of 70(1%) of NHL patients who has not the history of HBV infections. HGV-RNA was diagnosed in 2 of 70 (2.9%) of NHL patients and one of them was also shown the history of HBV infection. HGV-RNA was diagnosed in 1of 100 (1%) of controls but none of them was shown seroconversion to GBV-C/ HGV. HBV-DNA was found in 8 of 70 (11.6%) of NHL patients and 2 of 100 (2%) of controls. Significant differences were found in the prevalence of: HBV-DNA (P=0.013), HBsAb (P=0.001), and HBc-IgG-Ab (P=0.002) between NHL and controls. Determination of active and persistent infections of GBV-C/ HGV with or without HBV infection in NHL patients compared with control population proposed an association between viral hepatitis infections and NHL.[...] Read More.
Keywords: Non-Hodgkin’s lymphoma (NHL), GB virus C (GBV-C), hepatitis G virus (HGV).
Full text
Views:1212
Download:1361
文章
Mulissa Jida,* and Fassil Assefa
Abstract: Lentil (Lens culnaris Medik.) is an invaluable source of protein for the vast majority of Ethiopian people. It also maintains soil fertility through symbiotic nitrogen-fixation in association with Rhizobium leguminosarum bv. viciae. The aim of this study was selecting symbiotically efficient native lentil nodulating rhizobia endowed with different plant growth-promoting (PGP) characteristics. Hence, 30 lentil nodulating rhizobial isolates were isolated from soils collected from different farmer fields found in Central and Northern parts of the country. All isolates were characterized based on morphological, physiological, symbiotic and PGP characteristics. The result of this study showed that these isolates have exhibited interesting features such as wide range of carbon-sources and nitrogen sources utilization, tolerance to acidic and alkaline pH, metal toxicity and antibiotics. Symbiotic characterization indicated that all tested isolates have showed great diversity in their capacity to nodulate their host plant and produce shoot dry matter yield under glasshouse conditions. In addition, they showed PGP characteristics such as IAA production and inorganic phosphate solubilization. Out of all tested isolates 36.7% of them were IAA producer while only 16.7% were insoluble inorganic phosphate solubilizer. In general, from the present study, it can be concluded that Ethiopian soils harbor highly efficient nitrogen-fixing lentil nodulating rhizobia which are diverse in their morphological, physiological and symbiotic characteristics.[...] Read More.
Keywords: Lentil, Rhizobium, Ethiopia, IAA production, phosphate solubilization.
Full text
Views:1200
Download:1249
Submit Your Manuscript Now