mostafa govahi

In recent years, the use of electrospun pads with cross-linking agents has attracted significant attention due to their improved mechanical and biological properties. These pads have great potential for applications in tissue engineering and the repair of damaged tissues. In this study, the effects of different cross-linking agents, including calcium chloride, citric acid, glutaraldehyde, and zinc chloride, on the mechanical properties of electrospun polyvinyl alcohol (PVA), sodium alginate (NaAlg), and cellulose nanofibers (CNF) pads were investigated.

To prepare the electrospun pads, process variables were first optimized. Then, a combination of PVA, NaAlg, and CNF solution was prepared and added to it different amounts of cross-linking agents at different levels. The electrospinning of these solutions was carried out under optimal conditions and the Tensile Strength of the pads were measured. To evaluate the functional groups and morphology of the pads, Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) and Scanning Electron Microscopy (SEM) analyses were performed. Response surface methodology (RSM) was used through central composite design (CCD) to investigate the effect of experimental variables. Data analysis was also performed using Design Expert 12 software.

The analysis of obtained results using the Response Surface Methodology (RSM) showed that the addition of crosslinking agents significantly increased the tensile strength of the electrospun pads. The electrospun pads containing calcium chloride and glutaraldehyde exhibited an increase in tensile strength by 77 % and 40 %, respectively. Also, Citric acid and zinc chloride increased the tensile strength of the pads by up to 29 % compared to the control sample.SEM images indicated that the crosslinking agent calcium chloride caused the fibers to come closer and increase the number of connections. ATR-FTIR results indicated changes and the creation of new functional groups, which were observed in the stretching vibration regions of O-H and C=O bonds. Furthermore, ATR-FTIR analysis showed that in the presence of calcium chloride, the interaction of calcium ions with hydroxyl and carboxyl groups in the polymers led to the formation of hydrogen bonds and new linkages.

The use of cross-linking agents of calcium chloride and Glutaraldehyde effectively improved the mechanical and structural properties of the PVA-NaAlg-NFC electrospun pads. Overall, the results of this study showed that the appropriate selection of cross-linking agent can lead to the preparation of electrospun pads with high strength to be used as a substrate for various research applications. Also, this research can be a guide for the development of advanced and innovative materials in the field of tissue engineering and other biological and medical applications.

Ginkgo biloba is a plant with many therapeutic characteristics because it’s rich in polyphenolic contents. This study was done to evaluate the antibacterial activities of Ginkgo and to compare the antibacterial potential of ethanolic, methanolic and aqueous leaf extracts of Ginkgo biloba.

The antibacterial activity of Ginkgo extracts was evaluated using a disc diffusion method against four strains of bacteria: Escherichia coli, Salmonella typhimurium, Bacillus subtilis, and Staphylococcus aureus. The Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of the extracts were assessed.

The results indicated that all extracts of Ginkgo possess distinguished antibacterial activity. Among them the methanolic extract exhibited maximum antibacterial activity and the aqueous extract showed minimum antibacterial activity. The highest MIC and MBC were determined at 3.13 and 6.25 µg/mL of aqueous extract against Bacillus subtilis, respectively.

Regarding the acquired results from this study, the leaves of Ginkgo biloba possess a considerable amount of antibacterial activity that can make them one of the most valuable antibacterial resources that could be used in food and therapeutic industries. Therefore, more studies should be conducted on this plant.

Reactive oxygen species cause disease by damaging the chemical compounds in our body. On the other hand, drug resistance is becoming a serious issue in infection treatment, globally. Ginkgo biloba has many therapeutically features. The objective of this study was to evaluate antioxidant and antibacterial activity of Iranian Ginkgo’s leaf extracts.

In this experimental study, aqueous, ethanolic (%70) and methanolic (%80) extracts were made using Ginkgo. Total Phenolic and Flavonoids Content were measured by folin– ciocalteu reagent and Chloride Aluminum color assays. The extracts’ antioxidant activity was assessed by their potential in scavenging DPPH free radicals. Disc Diffusion assay was carried out to test antibacterial potency against two strains of bacteria (Enterococcus faecalis, Listeria monocytogenes). Data analysis was performed using factorial experiment within a completely randomized design. SPSS version 16 software and Duncan's multiple range tests were used to compare the means.

Based on results, all three extracts contained extensive amount of phenolic and especially flavonoid compounds with methanolic extract being the richest in phenolic and flavonoids while aqueous extract having the least of these compounds. The most antioxidant activity was found in methanolic extract of 300 mg/mL concentration with %84.73 (P<0.05) and the least was in aqueous extract of 40 mg/mL with %18.17 (P<0.05) ROS scavenging rate, this result was proportional to the measured bioactive components of the extracts. Antibacterial activity in 200 mg/mL concentration of methanolic extract was maximum against Enterococcus faecalis while it was minimum at 50 mg/µl concentration of aqueous extract against Listeria monocytogenes strain. Antibacterial activity of all three extracts was found out to be concentration dependent.

The results indicated that Ginkgo leaves are rich in phenolic and flavonoids contents that may be reason behind their notable antioxidant and antibacterial activity. Thus, Ginkgo could be a treasure trove of antioxidants and therapeutic compounds. However, more studies are required in regard to Ginkgo’s various characteristics.

Due to various antioxidant and antimicrobial compounds, plants are considered valuable sources. Ferula gummosa Boiss plant is one of the most important species of the Apiaceae family and is scattered in the eastern and western regions of Iran. This study aimed to investigate the antioxidant and antimicrobial properties of aqueous and hydroalcoholic extracts of Ferula gummosa Boiss plant gum.

The levels of phenolic and flavonoid compounds and the antioxidant capacity (by the iron reduction and 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging methods) were determined in this laboratory study. The antimicrobial activity of the extracts was evaluated using the disc diffusion method, the minimum inhibitory concentration (MIC) and minimum bactericidal concentration were determined for some bacteria. Data analysis was performed using a factorial experiment within a completely randomized design, and Duncan's multiple range test was used to compare the means.

The highest content of phenolic compounds and flavonoids in methanol extract were (53.21±2.43 mg GAE/g dw) and (38.42±1.78 mg QE/g dw), respectively. The highest percentage of free radical scavenging and iron reduction power related to the methanolic extract was 96.43±3.56% and 1.963±0.012 µg/ml, respectively. Antimicrobial activity using the disk diffusion method and the MIC of Bacillus subtilis bacteria in all three extracts showed the most sensitivity compared to other bacteria.

The results of this study showed that the methanolic extract of the Ferula gummosa Boiss plant had antimicrobial activity, antioxidant potential, and higher phenolic and flavonoid content than the ethanolic and aqueous extracts.

Due to the increasing resistance of bacteria to antibiotics and the presence of antibacterial compounds in plants, in this study, the effect of hydro-alcoholic and aqueous extracts of Physalis alkekengi on some pathogenic bacteria was investigated.

In this experimental study, the dried fruits of the Physalis alkekengi were purchased from a medicinal plant shop and after extraction, the antibacterial effect of the aqueous, ethanolic, and methanolic extracts of the plant against standard strains of Escherichia coli, Salmonella typhimurium, Bacillus subtilis, Staphylococcus aureus were evaluated. Antibacterial activity, Minimum Inhibitory Concentration (MIC), and Minimum Bactericidal Concentration (MBC) of the extracts were determined using serial dilution and disk diffusion methods.

In the disk diffusion method, all concentrations of the methanolic extract of Physalis alkekengi had an inhibitory effect on Bacillus subtilis and Staphylococcus aureus. However, the inhibitory effect of the methanolic extract was considerably higher than the aqueous extract. The lowest inhibitory concentration of the methanolic extract was 12.5 mg/ml, and the minimum lethal concentration was 25 mg/ml. Aqueous and ethanolic extracts of the plant had the minimal effect on the standard strain of Staphylococcus aureus.

Aqueous, ethanolic, and methanolic extracts showed different levels of antibacterial properties in a concentration-dependent method. Therefore, the inhibitory effects against each bacterium can probably be attributed to the activity of the active ingredients of the plant, the extraction method, and the properties of the solvent used.

Medicinal plants contain a high level of antioxidant compounds such as flavonoids, phenolic, carotenoids, and tannins, which can be used to eliminate excess free radicals in the body. This study aimed to determine the total phenolic and flavonoid content and to investigate the antioxidant and antibacterial effects of Berberis integerrima and Graminifolius tragopogon methanolic extracts on some Gram-positive and Gram-negative microorganisms.

In this descriptive-analytical study, methanolic extracts of B. integerrima and G. tragopogon were prepared using 80% methanol. Total phenol and flavonoid contents were determined by Folin–Ciocalteu and aluminum chloride colorimetric methods, respectively. The antioxidant capacity was assessed by 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity and reducing power methods. The antibacterial activity of the extracts of B. integerrima and G. tragopogon on Escherichia coli, Bacillus subtilis, Listeria monocytogenes, Staphylococcus aureus, and Salmonella typhimurium were determined by the disk diffusion method. Butylated hydroxytoluene and ciprofloxacin were used as positive controls for antioxidant activity and bacterial strains, respectively.

Total phenol and flavonoid compounds in the extracts of B. integerrima and G. tragopogon were 46.90±0.70 and 22.63±0.59 mg gallic acid per gram of extract and 5.61±0.01 and 46.74±0.81 mg quercetin per gram of extract, respectively. The extracts of B. integerrima and G. tragopogon showed significant antibacterial activity. B. subtilis and S. typhimurium showed the highest sensitivity and resistance to the extracts, respectively. Moreover, the extract of B. integerrima had the most potent inhibitory effect on the examined microorganisms.

B. integerrima extract exhibits higher phenolic content, antioxidant properties, and antimicrobial activity than G. tragopogon extract.

Trametes versicolor is important for its medicinal rather than nutritional value. Given the various pharmacological activities of this plant, this study aimed to investigate the antioxidant and antimicrobial potential of the aqueous extract of T. versicolor.

In this descriptive-analytical study, an aqueous extract of T. versicolor was prepared. Antioxidant activity, flavonoid content and total phenol were measured by diphenyl picryl hydrazyl (DPPH) and reducing power (RP) methods, aluminum chloride (AlCl3), and Folin-Ciocalteu assays. The antibacterial and antifungal activity of the aqueous extract of T. versicolor on Staphylococcus aureus, Escherichia coli and Fusarium thapsinum was determined by the disk diffusion method. Butylated hydroxytoluene (BHT), ciprofloxacin and amphotericin-B were used as positive controls for antioxidant activity and bacterial and fungal strains, respectively.

Total phenolic content was 27.6±0.38 (mg GAE/g), and total flavonoid content was 4.2±0.04 (mg QE/g). Based on DPPH radical scavenging activity, the extract of T. versicolor showed strong scavenging activity (93.8±1.2 %) with IC50 of 103.9±0.8 μg/mL when compared with the standard BHT (IC50 of 30.0±0.6 μg/mL). In addition, it was observed that increasing the concentration of aqueous extract of turkey tail increased the reducing power of iron. The zone of inhibition around the extract ranged from 13.0±0.65 mm (in F. thapsinum at 75 mg/ml) to 21±0.73 mm (in S. aureus at 300 mg/ml) (P<0.05).

The aqueous extract of  T. versicolor contains a significant amount of phenolic compounds and also has strong antimicrobial and antioxidant properties.

Due to the increase of environmental problems as well as microbial resistance against antibiotics in recent years, the efforts to expand and develop bioactive compounds with antimicrobial capability have been greatly increased. Plant extracts are very important as potential sources of these compounds. The present study aims to investigate and compare the antimicrobial activity of aqueous and methanolic extracts of Ferula assafoetida.

In this experimental study, the antibacterial activity of aqueous and methanolic extracts of Ferula assafoetida was evaluated by the disk diffusion method. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were evaluated. Data analysis was performed using factorial experiment within a completely randomized design and using SPSS 25 software.

Results showed that the aqueous extract had a higher antimicrobial activity compared to the methanolic extract. The highest zone of inhibition with a diameter of 30±0.2 mm was observed for aqueous extract at the concentration of 400 mg/mL against gram-positive Bacillus subtilis. The lowest values of MIC and MBC were observed for aqueous extract against gram-positive Bacillus subtilis at concentrations of 0.77 and 1.55 mg/mL, respectively.

In general, the results of this study showed that the type of solvent and extraction method has a significant effect on the antibacterial effects of bioactive compounds. Different extracts of Ferula assafoetida, having appropriate antibacterial activity against bacteria strains, especially gram-positive ones, can be used as a promising source in health and therapeutic products.

Medicinal plants are valuable sources of different antioxidant and antimicrobial compounds. In this study, the effects of different extraction methods with aqueous and methanolic solvents were investigated on the antioxidant and antimicrobial activities of Teucrium hyrcanicum L.

In this basic experimental study, aqueous and methanolic extraction was carried out using three methods, including a magnetic stirrer, a Bain-Marie bath, and Shaker. The antioxidant effects were then determined using DPPH and RP methods along with the determination of total phenol and total flavonoid. The antibacterial effect of aqueous and methanolic extracts against Staphylococcus aureus, Bacillus cereus, and Escherichia coli was determined through the disk diffusion method.
(Ethic code: IR.ausmt.rec.1398.11.34)

The evaluation of antioxidant properties showed that methanolic extract had a stronger effect than aqueous extract. Moreover, it was demonstrated that the magnetic stirrer method was superior to the other two extraction methods. The same results were obtained for total phenol and total flavonoid as well. Evaluation of antibacterial properties revealed that methanolic extract had antibacterial activity, while aqueous extract did not show antibacterial activity.

The results of this study showed that Teucrium hyrcanicum L. was more effectively extracted through the magnetic stirrer method than other extraction methods. Both aqueous and methanolic extracts had antioxidant properties, while only methanol extracts showed antibacterial properties. Therefore, this plant can have good therapeutic application in the treatment of diseases due to its antioxidant properties.

Latent third molar extraction is the most common surgery in dentistry. Common complications of this surgery include pain, swelling, and trismus. To control these side effects, several drugs have been developed and evaluated in various studies. However, the present study is the first one to compare the effects of ibuprofen and ketorolac on pain, swelling, and trismus after molar surgery.

This study was a split-mouth clinical trial. To conduct the trial, 20 candidates were selected from among patients referring to Surgery Department of the Dentistry School at Yazd Shahid Sadoughi University of Medical Sciences for mandibular third molar removal surgery. The patients were divided into two groups after the surgery: one group received ibuprofen, and the other one received ketorolac. Pain, swelling, and trismus were evaluated prior to the surgical procedure, 24 hours later, and one week after the surgery. Data were analyzed by SPSS software version 22 by using Wilcoxon statistical tests and paired t test.

Ibuprofen and ketorolac had similar effects on pain relief (P value>0.05). Studying the two groups produced similar results regarding improvement in mouth opening (P value>0.05). Improvement pace of the postoperative swelling was significantly faster in the group receiving ketorolac compared to the one receiving ibuprofen (P value <0.05).

It was concluded that ibuprofen and ketorolac had positive and almost similar effects on pain control, edema, and trismus after molar surgery. However, ketorolac was more effective in controlling edema after surgery.

Broccoli sprout extract (Brassica oleracea) has extensive biological activities that are mainly attributed to the presence of bioactive compounds, such as sulforaphane. This study aimed to investigate the antioxidant and antibacterial activities of cooked and raw extracts of broccoli sprouts.

The amount of sulforaphane in broccoli sprout extract was evaluated by high-performance liquid chromatography (HPLC). Moreover, the amount of phenolic and flavonoid compounds and antioxidant capacity were investigated by the DPPH free radical scavenging method. In addition, the antibacterial activity of raw and cooked sprout extracts on some bacteria was explored using disk diffusion assay and minimum inhibitory concentration (MIC) by macro dilution method. Significant differences were analyzed by one-way analysis of variance (ANOVA) through Duncanchr('39')s multiple range test.

Based on the results obtained by HPLC, the amount of sulforaphane in the raw broccoli sprout extract was determined to be 787.46 μg/mL. Moreover, the antioxidant activity of raw and cooked sprout extracts depicted a higher antioxidant activity with an increase in concentration. Furthermore, the antibacterial study showed that cooked sprout extract had higher antimicrobial activity, compared to the raw sprout extract (at a significance level of 0.05). The highest growth inhibition zone was found against Gram-positive Bacillus cereus strain with a diameter of 18±0.6 mm; moreover, the lowest amounts of MIC and MBC were obtained at 0.39 and 0.78 mg/mL, respectively.

In general, the results show that cooked broccoli sprout extract has significant antioxidant and antibacterial activities, compared to the raw sprout. Accordingly, it can be utilized in food, health, and medical products as a highly promising source. However, further studies are required to be conducted in this regard.

The glial cell-derived neurotrophic factor (GDNF) family plays essential roles in the maintenance,growth, regulatory and signalling pathways of spermatogonial stem cells (SSCs). In this study, we analysed the expressionof anti-GDNF family receptor alpha 1 antibody (GFRa1) by immunohistochemistry (IHC), immunocytochemistry(ICC), Fluidigm real-time polymerase chain reaction (RT-PCR) and flow cytometry analyses. In this experiment study, ICC, IHC, Fluidigm RT-PCR and flow cytometry were used toanalyse the expression of the germ cell marker GFRa1 in testis tissue and SSC culture. IHC analysis showed that there were two groups of GFRa1 positive cells in the seminiferous tubules basedon their location and expression shape - a small round punctuated shape on the basal compartment donut shape anda C-shaped expression located between the basal and the luminal compartments of the seminiferous tubules. OCT4and PLZF positive cells may have similar patterns of expression as the first group. Assessment of the seminiferoustubule sections demonstrated that about 27% of the SSCs were positive for GFRa1. Fluidigm RT-PCR confirmed thesignificant expression (p <0.001) of GFRa1 in the SSCs compared to testicular stromal cells (TSCs). Flow cytometryanalysis demonstrated that about 75% of the isolated SSCs colonies were positive for GFRa1. The results indicated that GFRa1 had a specific expression pattern both In Vivo and In Vitro . This finding could be helpful for understanding the proliferation, maintenance and signalling pathways of SSCs, and differentiation
of meiotic and haploid germ cells.

The growing demands of consumers for edible seed oils containing high unsaturated fatty acid and antioxidant content have resulted in considerable efforts to investigate plants as possible sources of oils and nuts. In this research, the amount of fatty acid compositions, total flavonoid, phenol and antioxidant properties of Pistacia atlantica and Pistacia khinjuk were evaluated. The kernel oil content of P. atlantica and P. khinjuk were 24.33 ± 0.333% and 31.00 ± 0.577%, respectively. Palmitic acid, Stearic acid, Oleic acid, Linoleic acid, and Palmitoleic acid were the main components in the oil of the two Pistacia species. The results showed that unsaturated fatty acids accounted for approximately 77.65% and 74.87% of total fatty acids in P. atlantica and P. khinjuk, respectively. The two Pistacia species were rich in phenolic compounds (130.77± 3.11 and 126.91± 4.41 mg quercetin/100 g oil) and had high antioxidant properties (4.545± 0.655 and 15.733± 0.689 mg/g oil) in P. atlantica and P. khinjuk, respectively. Oil content and Oleic acid of the two species of Pistacia are shown/known to be higher than some other edible oils. This research showed that the kernel oil of the two species of Pistacia have the same value in terms of quality, taste and natural antioxidant qualities with other edible oils.

The scope of oral and maxillofacial surgery (OMFS) is extensive and good knowledge about OMFS among different healthcare providers will be essential for referral of the patient. Therefore, this study aimed to evaluate the knowledge of general physicians of Yazd Province about the field of oral and maxillofacial surgery.

In this cross-sectional study, 112 general physicians of Yazd Province in 2017 were randomly selected. A valid and reliable questionnaire was used to collect data. The questionnaire included personal information (years of graduation, work experience and university) and one knowledge question (16 parts) from referral to specialists. Data analysis was performed using statistical software SPSS 17 and T-test.

The mean scores of physicians' knowledge about the oral and maxillofacial surgery were 13.22 ± 2.68 of 16 scores. There was no significant correlation between the years of graduation, work experience, university, with knowledge of referral to the oraland maxillofacial surgeon.

The findings of this study showed that knowledge of general physicians in Yazd about the role of oral and maxillofacial surgeons in the management of injuries and oral and maxillofacial problems is high.

We aimed to examine the expression levels of the VASA gene and protein in testis sections of neonate and adult mice as well as testicular cell cultures.

In this experimental study, in order to investigate the expression of this germ cell marker gene in more detail, we analyzed the expression of VASA by immunocytochemistry, immunohistochemistry and fluidigm reverse transcription-polymerase chain reaction (RT-PCR).

The immunohistochemical assays showed that the VASA protein was exclusively expressed in germ cells in the seminiferous tubules of the neonate and adult testis and not in somatic cells. VASA was not detectable in PLZF positive spermatogonial stem cells (SSCs), was weakly expressed in proliferating spermatogonia, and became abundant in spermatocytes and round spermatozoa. Counting VASA-positive cells in the seminiferous tubules of the neonate and adult testis depicted significant higher expression (P<0.05) of VASA in the adult testis in comparison to its neonate counterpart. SSC colonies were established in vitro after digestion of the testis and characterized by immunocytochemistry for CD90 and stage-specific embryonic antigens 3 (SSEA3). Immunocytochemistry confirmed that in contrast to the not detectable signal in vivo, VASA protein was strongly localized in the cytoplasm of both neonate and adult mouse SSCs under in vitro conditions. The results of Fluidigm RT-PCR revealed a significant higher expression of the germ cell gene VASA in adult SSCs in comparison to neonate SSCs in cell culture (P<0.05).

The VASA protein is, therefore, an extremely specific marker of testicular germ cell differentiation in vivo and mostly expressed in the adult testis in spermatocytes and round spermatids. The immunohistochemical signal in spermatogonia is very low. So, PLZF positive SSCs are negative for VASA in vivo, while in contrast, once isolated from the testicular niche VASA is also strongly expressed in SSCs under in vitro conditions.

Scutellaria pekinensis is one of the most valuable Medicinal species of the Lamiaceae family. The present study aimed to investigate the antibacterial and the antioxidant effects of Scutellaria pekinensis.
 

In this study, after extracting the aqueous and methanol extracts, the antioxidant effect of the extract was measure-using DPPH and FRAP methods. Disk diffusion method was use to investigate the antibacterial effect against three types of bacteria.In addition, the study examined phenolic and flavonoidal.
 

The results showed that the highest amount of phenol and flavonoid were obtained by methanol extract and shaker extraction method. The highest amount of free radical scavenging (DPPH) and FRAP were related to aqueous extract and shaker extraction method. The highest inhibition zone diameter for Bacillus cereus and Escherichia coli in the concentration of 600 mg/ml were 15.67±0.58, and 25.33±3.15 respectively, and for Staphylococcus aureus, the concentration of 900 mg / ml was 26±2.
 

The results showed that the solvent type and extraction method had a great impact on the amount of antioxidant compounds and antibacterial effects. Considering the few studies performed about this plant, the results of this study can be a good report for further research.

Dislocation of the mandibular condyle has been described as a clinical condition when the condylehead is displaced out of the glenoid fossa but still remains within the capsule of the joint. This dislocation of mandibular condyle can occur in anterior, posterior, lateral and superior direction. Here, we report a case of superolateral dislocation of bilateral condyles associated with symphysisfracture. The purpose of this report is to present this dislocation and its clinical management. Keywords: Mandible fracture, Condylar dislocation, Bilateral superolateral dislocation.