26 research outputs found
EFFECTS OF NANO-HYDROXYAPATITE DENTIFRICES WITH AND WITHOUT FLUORIDE ON PRIMARY TEETH ENAMEL: A MICRO-CT AND A SEM STUDY
Objectives: The ideal remineralization system should provide sufficient ion reserves to provide mineral gain on deeper surfaces, as well as being biocompatible and easy to apply with no adverse effect. The aim of this study was to evaluate the remineralization efficiency of dentifrice form of nano-hydroxyapatite alone and its combination with fluoride on initial enamel lesions in primary teeth by micro-CT and SEM. Materials and Methods: The enamel surfaces of 30 extracted primary incisors were treated with nano-hydroxyapatite based (nHAP), nano-hydroxyapatite-fluoride-containing (nHAP+F) and fluoride-containing dentifrice (F), respectively after the pH cycle. Mineral gain and surface properties were evaluated by micro-CT and SEM.Results: nHAP group provided more mineral gain than fluoride containing paste groups but there was no statistically significant difference (p>0.05) according to the micro-CT evaluations.In SEM images, the micropores were completely covered with an apatite layer and mineral precipitations were observed to be wider and more pronounced in the nHAP group. Calcium fluoride crystalline structures exhibited non-homogeneous globular precipitations in the F Group.Conclusions: It was concluded that nHAP dentifrice is as effective as fluoride dentifrice on initial enamel lesions in primary teeth with less caries-resistant enamel surface and therefore it can be safely used
The Investigation of Medical Student Journals
DergiPark: 963050tmsjAims: The aim of our study is to examine and evaluate data of medical student journals from around the world for the year 2020. Methods: In this observational study 20 medical student journals were examined. Data analyzed comprised of the year of foundation, country of origin, number of issues per year, types of articles published, and the total number of articles published in a year. Issues that were published in 2020 only were taken into consideration. Results: In 2020, the majority of medical student journals were based in the United States of America, followed by Canada. There were only four indexed (Scopus, Science Citation Index Expanded, PubMed) medical student journals; three were from the United States of America, and one from Canada. In comparison with other journals, the Yale Journal of Biology and Medicine had the most published issues. They also have the most crowded editorial board. Overall, the median of people on the editorial boards and advisory boards were 17.5 and 14, respectively. The median for issues per year was 2. The median number of publications in medical student journals in 2020 was 23. Among them, 13.1% were original research articles, 10.8% review articles, 9.4% case reports, 4.9% editorials, and 2.9% letters to the editor. The remaining 59.0% were publications that fell into the "others" category. Conclusion: In conclusion, the majority of medical student journals are based in North America and Europe, and a substantial amount of the published articles falls into the “others” category. Considering the lack of effective guidance and regulations with relevance to indexing. Medical student journals face certain challenges regarding visibility, accessibility, and publishing articles. However, provided that the editors of medical student journals remain keen, motivated, and focused, medical student journals will contribute to the scientific community by creating a supportive and intellectual environment for aspiring researchers where they can enhance their understanding of scientific research and publishing skills
Nephrolithiasis during the first 6 months of life in exclusively breastfed infants
Background: We investigated etiology and prognosis of infantile nephrolithiasis, including whether lithogenic and anti-lithogenic content of breast milk affects its formation. Methods: Thirty infants with nephrolithiasis and 30 healthy infants exclusively breastfed for the first 6 months of life were included in this prospective cohort case-control study. At entry, age, sex, and timing of birth of patients and controls were recorded. All patients were diagnosed and followed up periodically using ultrasonography. All infants received oral vitamin D (400 units/day). Lithogenic (calcium, oxalate, uric acid, phosphate) and anti-lithogenic (citrate, magnesium) components of maternal milk, serum calcium, phosphate, magnesium, 25-hydroxy vitamin D and parathormone, as well as spot urine calcium, uric acid, cystine, oxalate, magnesium, citrate/creatinine ratio, and calcium/citrate ratio were compared. Results: Mean follow-up period was 56.1 ± 6.8 months. There was no difference concerning lithogenic and anti-lithogenic content of breast milk. Serum calcium, phosphorus, alkaline phosphatase, and 25-hydroxy vitamin D levels (49.1 ± 19 vs. 26.7 ± 4 ng/ml, p < 0.001) were significantly higher and parathormone level significantly lower in patients. Random urine calcium/creatinine and calcium/citrate ratios were significantly higher in patient group (0.63 ± 0.40 vs. 0.42 ± 0.10 and 0.62 ± 0.12 vs. 0.41 ± 0.25 mg/mg, respectively, p < 0.01). Three patients were lost to follow-up after the first year. At last follow-up, calculi disappeared in 25/27 remaining patients without interventions or therapy. Conclusions: Breast milk does not have an etiologic effect in infantile nephrolithiasis. Higher serum vitamin D levels may have roles in development of lower levels of PTH and higher levels of serum and urine calcium, leading to stone formation. The prognosis for infantile stones is excellent. Graphical abstract[Figure not available: see fulltext.] © 2020, IPNA
İzmir ilinde bulunan termal sularda gelişen bazı termofilik mavi-yeşil alglerin (Siyanobakterilerin) izolasyonu ve moleküler tayini
The aim is the isolation and identification of blue-green algae (cyanobacteria) obtained from thermal waters of Izmir and around by using molecular methods in laboratory. The four types of blue-green algae (cyanobacteria) were collected from 3 centers which are Zeytindalı kaplıcaları, Sifne Termal Otel ve Balcova Termal Otel. The obtained four types of blue green algae (cyanobacteria) are isolated by purifying in culture medium at laboratory. Then DNA from the cells is isolated and amplified by PCR. Afterwards using the primers that are specific for blue green algae (cyanobacteria), 16S rRNA gene spaces are amplified by PCR and the resulting sequence was analyzed filogenetically in order to determine the species. According sequence analysis, three of the species was Geitlerinema sp. and the other one species is unculturedİzmir ili ve çevresindeki termal tesislerden elde edilen mavi-yeşil algler (siyanobakteriler) laboratuar ortamında izole edilip, moleküler yöntemlerle tür tayini çalışılmıştır. Zeytindalı kaplıcaları, Şifne Termal Otel ve Balçova Termal Otel olmak üzere 3 istasyondan elde edilen 4 mavi-yeşil alg (siyanobakteri) türü, laboratuarda kültür ortamında saflaştırılarak izole edilmişlerdir. Daha sonra elde edilen hücrelerden, DNA izolasyonu sonucu elde edilen DNA’lar PCR’da çoğaltılmıştır. Siyanobakterilere özgü primerler kullanılarak 16S rRNA gen bölgeleri tekrar PCR’da çoğaltılarak elde edilen dizi analizi verileri bilgisayar programlarında yorumlanarak filogenetik bakımdan tür tayini yapılmaya çalışılmıştır. Dizi analizlerine göre yapılan tür tayini doğrultusunda, örneklerden üçünün Geitlerinema cinsi olduğu diğer 1 türün ise kültürü belirlenmemiş tür olduğu belirtilmiştir
Diffusion weighted magnetic resonance imaging of kidneys in children with vesicoureteral reflux.
PURPOSE: The apparent diffusion coefficient (ADC) which obtain from diffusion-weighted magnetic resonance imaging (DWI), is a quantitative parameter representing the renal function and parenchymal damage in some renal disorders. The primary aim of this study was to investigate whether renal tissue alterations associated with vesicoureteral reflux (VUR) can be displayed by DWI. The secondary aim was to assess how ADC values change with age in kidneys with and without VUR. MATERIALS AND METHODS: This prospective study included 46 patients (8 boys, 38 girls; mean age 7.3 ± 4.2; range 1-15 years) with VUR and 54 control subjects (21 boys, 33 girls; mean age 7.7 ± 5.2; range 1-17 years). All subjects underwent DWI of the kidneys using b value of 600s/mm(2) in addition to MR urography. The ADC values of 71 kidneys with VUR were compared with those of 81 kidneys without VUR. RESULTS: The mean ADC values were (1.93 ± 0.36)×10(-3)mm(2)/s, (1.97 ± 0.24)× 10(-3)mm(2)/s, (1.83 ± 0.37)× 10(-3)mm(2)/s, (1.98 ± 0.20)×10(-3)mm(2)/s and (2.08 ± 0.42)× 10(-3)mm(2)/s in normal kidneys, and in those with grade 1, grade 2, grade 3 and grade 4 VUR, respectively. There was no significant difference in ADC values between kidneys with and without VUR. There was a significant positive correlation between the age and ADC values both in kidneys with and without VUR (r=0.79, p<0.001 and r=0.82; p<0.001, respectively). CONCLUSION: DWI does not reveal probable parenchymal alterations in reflux nephropathy. ADC values increase with age during childhood not only in normal kidneys but also in kidneys with VUR
Efficacy of magnetic resonance urography in detecting renal scars in children with vesicoureteral reflux.
BACKGROUND: The detection of renal scars is of paramount importance for optimal clinical management of patients with urinary tract infection (UTI) and vesicoureteral reflux (VUR). The aim of our study was to compare the efficacy of unenhanced magnetic resonance urography (MRU) and Tc-99(m) dimercaptosuccinic acid (Tc-DMSA) scintigraphy to dectect renal scars. METHODS: Unenhanced MRU and Tc-DMSA scintigraphy were performed in 49 children (10 boys, 39 girls; mean age 7.4 ± 4.2 years, range 1-15 years) with documented VUR. MR imaging scans were obtained within 7 days after voiding cystourethrogram (VCUG) and Tc-DMSA scintigraphy. The diagnostic performance of MRU in renal scar detection was calculated relative to that of the Tc-DMSA scan. RESULTS: The renal scar detection rate of Tc-DMSA scintigraphy and unenhanced MRU in kidneys with VUR was 32.4 and 25.9%, respectively. The sensitivity and specificity of MRU in the detection of renal scars was 80 and 82.6% in kidneys with VUR, respectively. There was no statistically significant difference in lesion detection between MRU and Tc-DMSA scintigraphy (P > 0.05). MRU and Tc-DMSA scintigraphy showed good agreement (κ = 0.60). CONCLUSIONS: Unenhanced MRU is a robust technique for the morphologic assessment of the urinary system and detection of renal scars. The lack of radiation and contrast material makes this technique a much safer alternative to scintigraphy in children with VUR, particularly in those who require follow-up scanning and, consequently, considerable radiation exposure