scholarly journals Effect of blue laser on viability of Proteus mirabilis

2021 ◽  
pp. 1438-1446
Author(s):  
Mawada M. Funjan
Keyword(s):  
Exposure Time ◽  
Proteus Mirabilis ◽  
Bacterial Species ◽  
Test System ◽  
Blue Laser ◽  
Diffusion Method ◽  
Biochemical Tests ◽  
Burn Wounds ◽  
Antibiotic Susceptibility Test

The usage of blue laser has been considered as a therapeutic approach to prohibit the viability of bacterial species, but there is no agreement about optimum parameters to be used. The aim of this project is to study the influence of blue laser (450 nm) on the viability of the gram-negative bacteria  Proteus mirabilis isolated from burn wounds, using different exposure times (i.e. doses) in vitro. Seventy swab samples were collected from burn wounds of patients admitted to the burns unit in AL-Yarmouk teaching hospital in Baghdad, during the period from June to August 2019. The Bacteria were isolated and identified depending on their culture characteristics, biochemical tests, gram staining, and morphology, being finally confirmed by API 20E Test System. By using the disk diffusion method, susceptibility of the isolates to 12 different antibiotics was examined. One isolate of P. mirabilis was elected according to susceptibility to all antibiotics used.  To prepare bacterial solution, P. mirabilis was mixed with normal saline solution. Dilution of 10-6 cell/ml for p. mirabilis was selected from other serial dilutions. A number of colonies and colony forming units (CFUs/ml) were achieved and correlated to controls.  P. mirabilis was irradiated by blue diode laser (450 nm, 500mw) and exposed to different doses (24, 48, 72, 96, 120J/cm2) corresponding to respective exposure times (4, 8,12,16,20 minutes). The results of antibiotic susceptibility test indicate that the entire isolates of P. mirabilis were multidrug resistant. With the increase in laser dose (exposure times), the number of colonies and  CFUs/ml were reduced, reaching a highest inhibition in CFU/ml  at exposure time of  20 minutes, i.e. a dose of 120J/cm2 , with  irradiance of 0.1 watt/ cm2. No significant reduction was recorded in CFU/ml   at exposure time of 4 min (a dose of 24J/cm2). As a conclusion, the blue laser irradiation at wavelength of 450 nm and 500mw had antibacterial effects on P. mirabilis isolated from burn wounds with irradiance of 0.1watt/cm2 in vitro, as evidenced by the effective reduction in the viability of bacteria at a dose of 120J/cm2 corresponding to exposure time of 20 minutes.

scholarly journals Antibiotic sensitivity and in vitro antimicrobial activity of plant extracts to pseudomonas fluorescens isolates collected from diseased fish

1970 ◽  
Vol 1 (4) ◽  
pp. 82-88 ◽  
Author(s):  
MJ Foysal ◽  
MM Rahman ◽  
M Alam
Keyword(s):  
Antibacterial Activity ◽  
Pseudomonas Fluorescens ◽  
Plant Extracts ◽  
Antibiotic Sensitivity ◽  
Diffusion Method ◽  
Biochemical Tests ◽  
Leaf Extracts ◽  
Sensitivity Pattern ◽  
Medicinal Plant Extracts

Studies were conducted to identify Pseudomonas fluorescens isolates from a collection of bacteria isolated from bacterial haemorrhagic septicaemia infected carp and catfish, evaluate their antibiotic sensitivity pattern and screen the antibacterial activity of some medicinal plant extracts against the isolates.. A total of 10 isolates were identified as P. fluorescens by morphological, physiological and biochemical tests. In vitro antibiotic sensitivity test of the P. fluorescens isolates were conducted by disc diffusion method for seven antibiotics where, all of the isolates were found to be sensitive only against streptomycin and gentamycin but, most of the isolates (80%) were found resistant to chloramphenicol (C). Moreover, eighty percent of the isolates showed resistance to multiple antibiotics. A total of 118 plant extracts were screened for their antibacterial activity against the P. fluorescens isolates where the isolates exhibited sensitivity to 30 samples. Leaf extracts of Tamarindus indicus, Terminalia chebula, Citrus aurantifolia, Eugenia caryophyllata and Spondias pinnata were found to inhibit the growth of all of the P. fluorescens isolates. DOI: http://dx.doi.org/10.3329/ijns.v1i4.9733 IJNS 2011 1(4): 82-88

scholarly journals Identification and antibiogram study of bacterial species isolated from milk samples of different locations in Bangladesh

2016 ◽  
Vol 1 (3) ◽  
pp. 457-462 ◽  
Author(s):  
Md Nuruzzaman Munsi ◽  
Nathu Ram Sarker ◽  
Razia Khatun ◽  
Mohammed Khorshed Alam
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pathogenic Bacteria ◽  
Bacterial Species ◽  
Salmonella Typhi ◽  
Diffusion Method ◽  
Biochemical Tests ◽  
Public Health Importance ◽  
Milk Samples ◽  
First Choice

Cow’s milk containing pathogenic bacteria is an important threat to the consumers. The objectives of the present study were to identify the bacterial agents of public health importance in milk samples (n=35) of different locations and to determine their sensitivity to different antibiotics. The milk samples were collected and transported aseptically and subsequently allowed for culture in bacteriological media, Gram’s staining and biochemical tests for the identification of bacterial species. The bacteria identified were Staphylococcus aureus, Escherichia coli and Salmonella typhi, and their prevalence, in case of vendor milk specimens (n=28), were 96.43%, 53.57% and 35.71% respectively, and of brand milk specimens (n=7), were 42.86 %, 28.57% and 0%, respectively. This suggests that cautionary measures should be taken for quality milk production and consumption. The antibiotic sensitivity test was done by disc diffusion method and the average inhibition zones, in case of Staphylococcus aureus, were 32 mm for oxytetracycline, 26 mm for amoxicillin, 35 mm for ciprofloxacin, 27 mm for cefotaxime, 30 mm for ceftriaxone, 30 mm for azithromycin, and 26 mm for erythromycin; in case of Escherichia coli, were 5 mm for oxytetracycline, 9 mm for amoxicillin, 22 mm for ciprofloxacin, 30 mm for cefotaxime, 31 mm for ceftriaxone, 15 mm for azithromycin, and 0 mm for erythromycin; in case of Salmonella typhi., were 25 mm for oxytetracycline, 24 mm for amoxicillin, 38 mm for ciprofloxacin, 31 mm for cefotaxime, 34 mm for ceftriaxone, 24 mm for azithromycin, and 0 mm for erythromycin. Therefore, ciprofloxacin and ceftriaxone may be the antibiotics of first choice, and cefotaxime and azithromycin may be the second choice among the test antibiotics for the treatment of illness caused by these bacteria.Asian J. Med. Biol. Res. December 2015, 1(3): 457-462

scholarly journals THE INHIBITORY ACTIVITY OF KELAKAI LEAF EXTRACT AGAINST THE GROWTH OF Porphyromonas gingivalis ATCC® 33277™

2020 ◽  
Vol 5 (2) ◽  
pp. 104
Author(s):  
Destri Khusnul Khotimah ◽  
I Wayan Arya Krishnawan Firdaus ◽  
Maharani Laillyza Apriasari
Keyword(s):  
Porphyromonas Gingivalis ◽  
Leaf Extract ◽  
Alveolar Bone ◽  
Bacterial Species ◽  
Diffusion Method ◽  
Control Group ◽  
Inhibitory Zone ◽  
Mueller Hinton Agar ◽  
Inhibitory Power

ABSTRACTBackground: Chronic periodontitis is an infectious disease that causes damage on periodontal ligament and alveolar bone. The severity of periodontitis is caused by several types of bacterial species which one of them is Porphyromonas gingivalis bacteria with a prevalence of 85% in oral cavity. The extract of kelakai leaf contained antibacterial in the form of flavonoid, alkaloid, tannin, and steroid. Flavonoid consists of some chemical compounds which is one of them is quercetin. The level of quercetin in kelakai leaf is 503.56 mgQE/g. From some secondary metabolites, kelakai leaf has inhibitory power toward gram negative bacterial, Porphyromonas gingivalis. Objective: This research was intended to know the activity of inhibitory power of kelakai leaf toward Porphyromonas gingivalis bacteria. Method: This research was an experimental research consisted of 5 experimental groups that were group of kelakai leaf extract on the concentrations of 100 mh/ml, 75 mg/ml, 50mg/ml, and 25 mg/ml and the control group (0.2% chlorhexidine). Each treatment was done in 4 repetitions. The test of inhibitory power used diffusion method by measuring the inhibitory zone around the growth of Porphyromonas gingivalis on Mueller Hinton Agar media. The data were analyzed by using One Way Anova 95% and then continued with LSD. Results: Based on the LSD test, it was known that the extract of Kelakai leaf had inhibitor power activity toward Porphyromonas gingivalis. The highest inhibitory zone was on the concentration of 100 mg/ml with inhibitory zone of 14.61 mm. Conclusion: The extract of kelakai leaf had inhibitory power activity toward Porphyromonas gingivalis bacteria in vitro. Keywords: 0.2% chlorhexidine, Diffusion method, Inhibitory power, Stenochlaena palustris extract, Porphyromonas gingivalis.

scholarly journals Synthesis , Spectroscopic and Antibacterial Studies of Zinc(II) Complexes Derived from Salicylaldehyde, Leucylalanine and Glycylglycine

2012 ◽  
Vol 9 (3) ◽  
pp. 532-540 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Schiff Base ◽  
Bacterial Species ◽  
Conductivity Measurement ◽  
Growth Inhibitor ◽  
Molar Conductance ◽  
Diffusion Method ◽  
Schiff Base Ligands ◽  
Elemental Analyses ◽  
L1 And L2

Two Schiff base ligands L1 and L2 have been obtained by condensation of salicylaldehyde respectively with leucylalanine and glycylglycine then their complexes with Zn(II)were prepared and characterized by elemental analyses , conductivity measurement , IR and UV-Vis .The molar conductance measurement indicated that the Zn(II) complexes are 1:1 non-electrolytes. The IR data demonstrated that the tetradentate binding of the ligands L1 and L2 . The in vitro biological screening effect of the investigated compounds have been tested against the bacterial species Staphlococcus aureus, Escherichia coil , Klebsiella pneumaniae, Proteus vulgaris and Pseudomonas aeruginosa by the disc diffusion method . A comparative study of inhibition values of the Schiff base ligands and their complexes indicated that the complexes exhibit higher antimicrobial activity than the free ligands . Zinc ions are proven to be essential for the growth-inhibitor effect. The extent of inhibition appeared to be strongly dependent on the initial cell density and on the growth medium .

scholarly journals <i>In-vitro</i> antibacterial sensitivity of <i>Usnea barbata</i> lichen extracted with methanol and ethyl-acetate against selected <i>Staphylococcus</i> species from milk of cows with mastitis

2014 ◽  
Vol 57 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Emrobowansan Monday Idamokoro ◽  
Patrick Julius Masika ◽  
Voster Muchenje ◽  
Daniel Falta ◽  
Ezekiel Green
Keyword(s):  
Antimicrobial Activity ◽  
Medicinal Plant ◽  
Ethyl Acetate ◽  
Ethyl Acetate Extract ◽  
Bovine Milk ◽  
Raw Milk ◽  
Diffusion Method ◽  
Biochemical Tests ◽  
Ethyl Acetate Extracts

Abstract. This study aimed at evaluating the antimicrobial potential of Usnea barbata lichen as a medicinal plant against selected Staphylococcus species isolated from raw milk of cows. In-vitro screening of methanol and ethyl-acetate extracts from Usnea barbata lichen were evaluated to determine their antimicrobial activity against thirteen different Staphylococcus species. The selected organisms were isolated from raw bovine milk and identified using several biochemical tests and confirmed with API staph kit. The antimicrobial activity of the extracts were evaluated using both the agar well diffusion method (at 5 mg/ml, 10 mg/ml and 20 mg/ml) and the broth micro-dilution technique to determine the mean zone of inhibition and the minimum inhibitory concentration (MIC), respectively. Both the methanol and ethyl-acetate extracts showed variable antimicrobial activity against the Staphylococcus species with mean zones of inhibition ranging from 0-34 mm in diameter at 5 mg/ml, 10 mg/ml and 20 mg/ml, respectively. Susceptibility by the Staphylococcus species tested in the methanol and the ethyl-acetate extract was 92.31 % and 53.85 %, respectively. The MIC result for the methanol extract ranged from 0.04 to 10 mg/ml, while that of the ethyl-acetate extract ranged from 0.16 to 5 mg/ml. Results from this study revealed the in vitro microbial activity of Usnea barbata extracts which indicate its potential as a medicinal plant.

scholarly journals Chemical composition and antibacterial activities of Capparis spinosa essential oils from Algeria

2019 ◽  
Vol 21 (1) ◽  
Author(s):  
Halima Benachour ◽  
Messaoud Ramdani ◽  
Takia Lograda ◽  
Pierre Chalard ◽  
Gilles Figueredo
Keyword(s):  
Chemical Composition ◽  
Essential Oils ◽  
Bacterial Species ◽  
Antibacterial Activities ◽  
Diffusion Method ◽  
Hexadecanoic Acid ◽  
Disc Diffusion Method ◽  
E Coli ◽  
Capparis Spinosa

Abstract. Benachour H, Ramdani M, Lograda T, Chalard P, Figueredo J. 2020. Chemical composition and antibacterial activities of Capparis spinosa essential oils from Algeria. Biodiversitas 21: 161-169. The essential oils of Capparis spinosa L. collected from six locations in Algeria were obtained by hydro-distillation. The chemical composition of oils was performed by GC-MS. The disc diffusion method is applied for the antibacterial activity. The extraction produced low yield (0.03%). The result of chromatographic analysis (GC/MS) leads to the identification of 33 components; palmitic acid (38.19%), nonanal-n (12.61%), cymene-2,5-dimethoxy-para (8.94%) and octacosane (5.49%) were the major components of these oils. The result of cluster analysis based on essential oils constituents showed the presence of three chemotypes,i.e., the chemotype of Nonanal-n-Cymen 2,5 dimethoxy para-Dodecanal, the chemotype of Nonanal-n-Hexadecanoic acid-tetracosane and the chemotype Tetracosane-n-pentyl furane-2-octacosane. In-vitro antimicrobial activity of caper oils against nine bacterial species showed that the oils have no activity against E. coli and have modest activities against eight other bacterial species tested; however, the desirability test shows that the oils used were not effective on the bacteria tested.

Incidence and Characterization of Listeria spp. from Foods Available in Korea

2001 ◽  
Vol 64 (4) ◽  
pp. 554-558 ◽  
Author(s):  
YOUNG-CHUN CHOI ◽  
SUN-YOUNG CHO ◽  
BOO-KIL PARK ◽  
DUCK-HWA CHUNG ◽  
DEOG-HWAN OH
Keyword(s):  
Lethal Effect ◽  
Food Samples ◽  
The Other ◽  
Hybridoma Cells ◽  
Biochemical Tests ◽  
Department Of Agriculture ◽  
Listeria Species ◽  
Antibiotic Susceptibility Test ◽  
Serotype 1

A total of 410 domestic Korean food samples were analyzed for the presence of Listeria spp. by the conventional U.S. Department of Agriculture protocol, and presumptive strains were identified by morphological, cultural and biochemical tests according to Bergey's manual and confirmed by API-Listeria kit. Among the total 410 food samples, 46 samples (11.2%) were found to be contaminated with Listeria species. Among the 46 strains of Listeria spp. isolates, 8 strains (17.42%) for Listeria monocytogenes, 3 strains (6.5%) for Listeria seeligeri, 33 strains (71.7%) for Listeria innocua, and 2 strains (4.4%) for Listeria welshimeri were identified, respectively. Also, only beef, chicken, pork, frozen foods, and sausage were contaminated with L. monocytogenes, and the other products were free of L. monocytogenes. Of 46 Listeria spp. isolates, L. innocua (71.7%) was the most predominantly isolated in a variety of foods compared to other Listeria spp. An in vitro virulence assay for Listeria spp. using myeloma and hybridoma cells from murine and human sources was performed. The result showed that only L. monocytogenes killed approximately 95 to 100% hybridoma cells after 6 h and the other Listeria species, such as L. innocua, L. seeligeri, and L. welshimeri strains had about 0 to 10% lethal effect on hybridoma cells. Also, an antibiotic susceptibility test showed that Listeria spp. isolates were very susceptible to the antibiotics tested, except for nalidixic acid. Also, serotyping results showed 75% of L. monocytogenes isolates from beef, chicken, and frozen pizza belonged to serotype 1 and 25% from sauage were type 4.

scholarly journals Microwave-Assisted Synthesis, Structural Characterization and Assessment of the Antibacterial Activity of Some New Aminopyridine, Pyrrolidine, Piperidine and Morpholine Acetamides

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 533
Author(s):  
Abdulmajeed S. H. Alsamarrai ◽  
Saba S. Abdulghani
Keyword(s):  
Antibacterial Activity ◽  
Bacterial Species ◽  
Antibacterial Properties ◽  
Molecular Structures ◽  
Secondary Amines ◽  
Diffusion Method ◽  
Microwave Assisted Synthesis ◽  
Mueller Hinton ◽  
Mueller Hinton Agar

A series of new acetamide derivatives 22–28 of primary and secondary amines and para-toluene sulphinate sodium salt have been synthesized under microwave irradiation and assessed in vitro for their antibacterial activity against one Gram-positive and two Gram-negative bacterial species such as S. pyogenes, E. coli, and P. mirabilis using the Mueller-Hinton Agar diffusion (well diffusion) method. The synthesized compounds with significant differences in inhibition diameters and MICs were compared with those of amoxicillin, ampicillin, cephalothin, azithromycin and doxycycline. All of the evaluated acetamide derivatives were used with varying inhibition concentrations of 6.25, 12.5, 37.5, 62.5, 87.5, 112.5 and 125 µg/mL. The results show that the most important antibacterial properties were displayed by the synthetic compounds 22 and 24, both of bear a para-chlorophenyl moiety incorporated into the 2-position moiety of acetamide 1. The molecular structures of the new compounds were determined using the FT-IR and 1H-NMR techniques.

scholarly journals Proteus mirabilis employs a contact-dependent killing system against competing Enterobacteriaceae

2021 ◽  
Author(s):  
Dara Kiani ◽  
William Santus ◽  
Kaitlyn A Kiernan ◽  
Judith Behnsen
Keyword(s):  
Stationary Phase ◽  
Proteus Mirabilis ◽  
Bacterial Species ◽  
Interference Competition ◽  
Yeast Cells ◽  
Type Vi Secretion System ◽  
Competition System ◽  
Initial Characterization

Many bacterial species encode systems for interference competition with other microorganisms. Some systems are effective without contact (e.g. through secretion of toxins), while other systems (e.g. Type VI secretion system (T6SS)) require direct contact between cells. Here, we provide the initial characterization of a novel contact-dependent competition system for Proteus mirabilis. In neonatal mice, a commensal P. mirabilis strain apparently eliminated commensal Escherichia coli. We replicated the phenotype in vitro and showed that P. mirabilis efficiently reduced viability of several Enterobacteriaceae species, but not Gram-positive species or yeast cells. Importantly, P. mirabilis strains isolated from humans also killed E. coli. Reduction of viability occurred from early stationary phase to 24h of culture and was observed in shaking liquid media as well as on solid media. Killing required contact, but was independent of T6SS, the only contact-dependent killing system described for P. mirabilis. Expression of the killing system was regulated by osmolarity and components secreted into the supernatant. Stationary phase P. mirabilis culture supernatant itself did not kill but was sufficient to induce killing in an exponentially growing co-culture. In contrast, killing was largely prevented in media with low osmolarity. In summary, we provide the initial characterization of a potentially novel interbacterial competition system encoded in P. mirabilis.

scholarly journals Bacteriological Profile of Organisms Isolated from Patients with Conjunctivitis in Katihar, Bihar

2021 ◽  
Vol 10 (15) ◽  
pp. 1079-1082
Author(s):  
Priya Sinha ◽  
Sangeeta Dey ◽  
Aninda Sen ◽  
Kahkashan Akhter ◽  
Alok Kumar ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Viral Infections ◽  
Diffusion Method ◽  
Biochemical Tests ◽  
Bacterial Conjunctivitis ◽  
Disk Diffusion Method ◽  
In Vitro Susceptibility ◽  
Female Ratio ◽  
Medical College

BACKGROUND Conjunctivitis is one of the most common nontraumatic eye complaints and is one of the most frequently reported diseases in the outpatient and emergency departments. Bacterial conjunctivitis has been reported as one of the most common type of infectious conjunctivitis after viral infections. It is also considered as the primary cause of acute conjunctivitis in children. This study was conducted to isolate and identify organisms causing bacterial conjunctivitis and to determine their in vitro susceptibility or resistance. METHODS This descriptive study was conducted in the Departments of Ophthalmology and Microbiology at Katihar Medical College from December 2018 to May 2020. Sociodemographic and clinical data were collected from 175 patients using structured questionnaire. External ocular specimens were collected using sterile swabs and inoculated on blood agar, MacConkey’s agar and chocolate agar. Presumptive isolates were further identified by a series of biochemical tests. All isolated organisms were tested for their in vitro antimicrobial susceptibility against various antibiotics using the Kirby-Baur disk diffusion method. RESULTS A total of 175 samples were collected, out of which, 62.8 % (110 / 175) showed growth of bacteria. Maximum cases of bacterial conjunctivitis were seen in the age group 11 - 20 years. The male to female ratio was 2.7:1. Maximum frequency of bacterial conjunctivitis was observed from May to September. Staphylococcus aureus was the most common bacteria isolate 65.5 % (72 / 110) followed by Staphylococcus epidermidis 19.1 % (21 / 110). Most of the Staphylococcus aureus isolates were found to be sensitive to moxifloxacin 98.6 % (71 / 72) and gentamicin 95.8 % (69 / 72). 25 % (18 / 72) of Staphylococcus aureus strains were found to be resistant to cefoxitin and were considered as methicillin-resistant Staphylococcus aureus (MRSA) strains. Maximum numbers of gram-negative strains were sensitive to moxifloxacin 100.0 % (9 / 9) followed by tobramycin 88.9 % (8 / 9). Pseudomonas aeruginosa strains showed maximum sensitivity to moxifloxacin 100.0 (8 / 8) followed by ofloxacin and ciprofloxacin 62.5 % (5 / 8). CONCLUSIONS This study provides an insight into the organisms isolated from cases of bacterial conjunctivitis in Katihar District of Bihar. Determining the susceptibility pattern of these pathogens to available antibiotics is crucial for effective management of bacterial conjunctivitis especially when treatment has to be given empirically. KEY WORDS Bacterial Conjunctivitis, Antibiogram

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