نتایج جستجو

4361

نتیجه یافت شد

مرتبط ترین ها

اعمال فیلتر

به روزترین ها

اعمال فیلتر

پربازدید ترین ها

اعمال فیلتر

پر دانلودترین‌ها

اعمال فیلتر

پر استنادترین‌ها

اعمال فیلتر

تعداد صفحات

437

انتقال به صفحه



فیلترها/جستجو در نتایج    

فیلترها

سال

بانک‌ها




گروه تخصصی









متن کامل


مرکز اطلاعات علمی SID1
نویسندگان: 

Jambulingam Munusamy | Thangadurai Subramaniamn Ananda | Vijayabaskaran Manickam

اطلاعات دوره: 
  • سال: 

    621
  • دوره: 

    5
  • شماره: 

    1
  • صفحات: 

    10-18
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    0
  • دانلود: 

    0
چکیده: 

Condensation of salicylaldehyde with D-alanine and L-serine was carried out to obtain Schiff bases and treated with various metal chlorides to form metal complex derivatives. The metals chlorides used for the preparation of metal complexes derivatives were copper, cobalt, iron, manganese, and zinc, respectively and characterized by elemental analysis, FT-IR, 1H NMR, 13C NMR, and LC-MS. Hence, a total of ten metal complexes derivatives was synthesized and screened for some tested bacterium organisms like Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa and Salmonella typhi. The synthesized metal complexes derivatives showed significant activity compared with Schiff base and ciprofloxacin used as standard. The synthesized metal complexes derivatives showed a good effect on the selected antibacterial strains, indicating that the activity was depending on the structure of the compound. Amongst the selected five metals, cobalt showed the good antibacterial activity followed by other metals in dimethyl sulfoxide as a solvent. The Schiff bases synthesized also showed significant antibacterial activity.

آمار یکساله:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 0

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesاستناد 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesمرجع 0
نویسندگان: 

IMANI FOOLADI A.A. | AGHELIMANSOUR A.

نشریه: 

VIRTUAL

اطلاعات دوره: 
  • سال: 

    621
  • دوره: 

    1
  • شماره: 

    1
  • صفحات: 

    0-0
تعامل: 
  • استنادات: 

    2
  • بازدید: 

    218
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

آمار یکساله:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 218

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesاستناد 2 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesمرجع 0
عنوان: 
نویسندگان: 

اطلاعات دوره: 
  • سال: 

    0
  • دوره: 

  • شماره: 

  • صفحات: 

    -
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    0
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

آمار یکساله:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 0

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesاستناد 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesمرجع 0
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
نشریه: 

VIRTUAL

اطلاعات دوره: 
  • سال: 

    621
  • دوره: 

    1
  • شماره: 

    1
  • صفحات: 

    0-0
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    144
  • دانلود: 

    0
چکیده: 

OBJECTIVE: Keffir is known as one of the sour milk products that originated in the north of caucasus.Up to now it hasnt been studied about its antimicrobial and antifungal effects. In general, keffir contains the following microorganisms: Lactic acid streptococci, lactiobacilli-mesophilic lactic acid, lactose fermenting and non-fermenting yeasts and lacetic acid bacteria.The objective of this study was to determine therapeutical effects of keffir. METHODS: This study was performed on bacteria such as stapihylococcus aureus, E. coli, Pseudomonas aeruginosa, salmonella typhi, and three species of fungi: candida albicans , trichophyton mentagrophytes and microsporum canis.The antimicrobial effects of eight extracts of common yoghurt and extract of keffir in the 200c and 370c at two times of 24 and 48 hour fermentation in invitro on four species of bacteria and three species of fungi were studied by cup plate and serial dilution method.FINDINGS: From extracts of common and keffir voghurt in the 20 and 37oc at two times of 24 and 48 hour, keffie had the most effect on p.aeruginosa in the 37oc with 48 hour fermentation time with 75 mg/ml concentration.CONCLUSION: Kerfir have the antimicrobial effect on some of pathogenic bacteria as P. aenuginosa.

آمار یکساله:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 144

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesاستناد 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesمرجع 0
نویسندگان: 

Mousavi S.M. | Archangi B. | Zamani I.

اطلاعات دوره: 
  • سال: 

    621
  • دوره: 

    78
  • شماره: 

    6
  • صفحات: 

    1738-1745
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    0
  • دانلود: 

    0
چکیده: 

Bacteriocins are a kind of antimicrobial peptides that kill or inhibit the growth of bacterial strains. The purpose of this study was to investigate the antibacterial effect of Serratia marcescens on several pathogenic bacterial strains. Bacteriocin produced by S. marcescens was purified by chromatography with Sephadex G-75 column, and its antibacterial effect on gram-negative bacteria, including Escherichia coli ATCC 700928, Pseudomonas aeruginosa PTCC 1707, S. marcescens PTCC 1621, Vibrio fischeri PTCC 1693, and Vibrio harveyi PTCC 1755, were evaluated by the disk diffusion method. The structure of bacteriocin was determined by nuclear magnetic resonance spectroscopy. The interaction of bacteriocin with the antigen 43 (Ag43) of E. coli was evaluated by the molecular docking method. Bacteriocin extracted from bacterial isolates had antibacterial activity on E. coli strains but not on other studied strains. Bioinformatics analysis also showed bacteriocin docking with Ag43 with an energy of -159.968 kJ/mol. Natural compounds, such as bacteriocin, can be an alternative to common chemical compounds and antibiotics. To reach a definite conclusion in this regard, there is a need for further research and understanding of their mechanism of action.

آمار یکساله:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 0

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesاستناد 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesمرجع 0
نویسندگان: 

Khodabandeh Mahmood | Afshoon Maryam

اطلاعات دوره: 
  • سال: 

    621
  • دوره: 

    8
  • شماره: 

    3
  • صفحات: 

    104-107
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    3
  • دانلود: 

    0
چکیده: 

Necrotizing fasciitis is a rare and lethal bacterial infection of the subcutaneous tissue and fascia in pediatrics, particularly when Pseudomonas Aeruginosa is involved. The similarity between cellulitis and Necrotizing fasciitis can lead to misdiagnosis. A 5-month-old male is introduced, presenting with fever and ecchymoses on his left thigh, which was treated as cellulitis. However, the diagnosis was changed to necrotizing fasciitis due to rapid progression in infection and Pseudomonas growth in cultures. The antibiotics were leveled up, and the surgeon debrided and grafted the skin. Finally, the patient was discharged in good condition. In the early stages of soft tissue infections, it is not possible to distinguish Necrotizing fasciitis from cellulitis, so empirical antibiotics should be started to cover poly-microbial infections, and the patient should be observed closely. When the infection does not respond to the antibiotics appropriately over 24 hours, the surgeon.

آمار یکساله:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 3

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesاستناد 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesمرجع 2
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
اطلاعات دوره: 
  • سال: 

    621
  • دوره: 

    10
  • شماره: 

    3
  • صفحات: 

    1041-1054
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    1
  • دانلود: 

    0
چکیده: 

Some bacteria commonly found on plants can catalyze the freezing of water at a higher temperature than others, at or near 0 °C. The freezing point of pure water is about -40 °C and is initiated by creating ice nucleations. However, when ice nucleation proteins (INPs) are present, ice nucleations form at temperatures close to or above 0 °C. INPs are often attached to the outer membrane by a phosphatidylinositol anchor and are sometimes secreted extracellularly. The monomers of INPs in Pseudomonas syringae are 120 to 180 kDa. INP has three domains, and the central domain is highly repetitive. The central domain consists of the consensus sequence of eight amino acid repeats. Eight amino acid repeats create a 16-residue fragment, and three 16-residue fragments form the 48-residue fragment. Studies have shown that INPs may have a β-helical fold and interact with water through the repetitive motif. Most ice nucleation bacteria are gram-negative, including P. syringae, Pseudomonas viridiflava, Pseudomonas fluorescens, Xanthomonas compestris, Erwinia ananas, and Erwinia herbicola. For optimum protein activity, the presence of the complete bacterial cell is essential. INPs are influential in different aspects, including snowmaking, agriculture, freeze-concentration in the food industry, signal transduction, atmospheric applications as cloud condensation nuclei, and surface display (expression of a foreign protein on the cell surface for biotechnological purposes). This study provides a brief overview of ice nucleation proteins and their applications since ice nucleation is an important phenomenon that affects various aspects, from climate to biological systems.

آمار یکساله:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 1

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesاستناد 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesمرجع 4
عنوان: 
نویسندگان: 

اطلاعات دوره: 
  • سال: 

    0
  • دوره: 

    21
  • شماره: 

    1
  • صفحات: 

    -
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    17
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

آمار یکساله:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 17

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesاستناد 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesمرجع 0
نویسندگان: 

Golabiazar Roonak

اطلاعات دوره: 
  • سال: 

    621
  • دوره: 

    42
  • شماره: 

    9
  • صفحات: 

    2745-2756
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    1
  • دانلود: 

    0
چکیده: 

This study reports the green synthesis and eco-friendly preparation of the magnetite nanoparticles (Fe3O4 NPs) using an aqueous extract of Qazwan (Pistacia atlantica) seeds as natural stabilizers and capping agents. The green Fe3O4 NPs were characterized with different characterization techniques such as Ultraviolet-Visible (UV-vis) Spectrometry, Energy Dispersive X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Field Emission Scanning Electron Microscopy (FESEM) Equipped with Energy Dispersive Spectroscopy (EDX), and Fourier Transform InfraRed (FT-IR) spectrophotometry. The UV-Vis spectrum and FT-IR were used to identify the biomolecules in the Qazwan seeds extract for green synthesized Fe3O4 NPs. The XRD, TEM, and SEM demonstrated the generation of  Fe3O4 NPs with an average diameter of 14-15 nm. The Williamson-Hall and the Scherrer equation obtained the crystalline size for Fe3O4 NPs, respectively, 6.43 and 14.22 nm which confirmed the effects of both crystallite size and strain. Additionally, the antibacterial and antifungal activity of synthesized Fe3O4 NPs was tested, which revealed that NPs had moderate antimicrobial activity against gram-positive bacteria (Enterococcus faecalis), gram-negative bacteria (E. coli, Pseudomonas aeruginosa, Acinetobacter baumanni, and Klebsiella pneumonia) and Candida albicans pathogenic fungal strains at different concentrations of Fe3O4 NPs (1.0 to 20 mg/mL) with average inhabitation zone of (8 to 22 mm).

آمار یکساله:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 1

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesاستناد 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesمرجع 0
اطلاعات دوره: 
  • سال: 

    621
  • دوره: 

    10
  • شماره: 

    4
  • صفحات: 

    1169-1175
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    0
  • دانلود: 

    0
چکیده: 

Introduction: The main objective of this study was to determine the chemical composition of the aerial part of the essential oil and the hydrosol extract of Inula viscosa which has never been studied and to compare their antioxidant, anti-inflammatory, and antimicrobial properties in vitro. This was done in order to identify new biologically active agents.Materials and Methods: The essential oil and hydrosol extract were analyzed by GC and GC/MS. Antimicrobial activity was tested against three bacteria and two fungi. The antioxidant activities were assessed using three different methods: radical scavenging activity (DPPH), the β-carotene bleaching test, and Ferric-Reducing Antioxidant Power (FRAP). The anti-inflammatory activity was assessed using the protein denaturation method.Results: The essential oil of Inula viscosa was composed mainly of hydrocarbon sesquiterpenes (52.6%) and oxygenated sesquiterpenes (47.0%), while the hydrosol extract was mainly composed of oxygenated sesquiterpenes (86.6%). The results of the biological activities showed that the hydrosol extract exhibited an interesting antioxidant activity, nearly equivalent to the synthetic antioxidant BHT. Furthermore, the hydrosol extract displayed very good anti-inflammatory activity, with an IC50 of 0.51 g/L, in comparison to diclofenac sodium (IC50 = 0.63 g/L). The hydrosol extract also exhibited antimicrobial activity and acted as an effective inhibitor of Bacillus cereus, Pseudomonas aeruginosa, Candida ATCC 26960, and Candida ATCC 10231 microorganisms.Conclusions: The hydrosol extract of I. viscosa make this specie a potential alternative natural for use in the food and pharmaceutical industries. It can be utilized in the treatment of diseases involving oxidative stress as well as in the treatment of microbial and inflammatory infections.

آمار یکساله:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 0

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesاستناد 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesمرجع 4
litScript
telegram sharing button
whatsapp sharing button
linkedin sharing button
twitter sharing button
email sharing button
email sharing button
email sharing button
sharethis sharing button