The traditional method for studying non-stationary signals is spectrogram based on the short-time Fourier transform (STFT). The well known limitation of the STFT is the inherent trade-off between time and frequency resolution. The Wigner-Ville (WV) distribution has the best time-frequency resolution, but its draw back is generating CROSS-terms. The matching pursuit (MP) distribution based on using the Gaussian atom is always positive, does not include CROSSterm, and has convenient resolution. In this paper, we have shown in addition to the known properties, the MP distribution can also remove the additive noise inherently. On the other words, we are able to remove the noise just by limiting the algorithm iterations and without paying any additional cost. Although the MP distribution based on using the Gaussian atoms is always positive and it has convenient resolution, according to the MP the time marginal and the frequency marginal will not be obtained accurately. In this paper, it has been shown that by implementing the minimum CROSS entropy (MCE) technique according to the MP distribution as a priory positive distribution, the new extracted distribution has the most similarity to the MP distribution and it also satisfies the correct time and frequency marginal.

Introduction: Effective plaque removal is an important factor in the long-term clinical success of dental implants. The aim of this study was to compare the clinical efficacy of a powered toothbrush (Power CROSS-Action) and a manual toothbrush (CROSS-Action) in the control of plaque and soft tissue inflammation around implants supporting mandibular overdentures.Materials and Methods: This study was a CROSS-over clinical trial. The subjects included 10 edentulous subjects, aged 47-73 years, with removable mandibular overdentures supported by 2 unsplinted implants, all the subjects wore maxillary complete dentures. The study consisted of two 4-week phases separated by a 2-week interval. In each phase each subject randomly used one toothbrush type. Two days prior to each phase, the implants were polished. Plaque and bleeding indices were recorded before and after brushing. Data was analyzed by t-test using SPSS software (a=0.05).Results: Both toothbrushes reduced the indices under study. Means of plaque index decreases were 0.5 in manual toothbrush and 0.44 in powered toothbrush. Means of bleeding index decreases were 0.27 in manual toothbrush and 0.3 in powered toothbrush. There were no statistically significant differences between the two toothbrush types in changing plaque index (p value=0.88) and bleeding index (p value=0.91).Conclusion: Both toothbrushes were efficient in plaque control around implants which supported mandibular overdentures and there was no difference between them. Patients can use one of these toothbrushes depending on personal preference and comfort.

Objective: Mechanical plaque removal namely tooth brushing is the most commonly used oral hygiene technique. Efficacy of tooth brushing is influenced by the design and shape of toothbrush. This study aimed to compare the efficacy of two common Iranian toothbrushes with a foreign made one in plaque removal.Methods: This clinical trial was conducted on 30 female dental students in Babol University, School of Dentistry using simple randomized sampling. Oral B CROSS Action(Germany), Panberes CROSS Action and Panberes Classic (Iran) toothbrushes were compared. Students were asked not to brush their teeth for 24 hours before the first visit. At the first visit, subjects received oral prophylactic procedures and the baseline plaque index was recorded before brushing for all subjects using 0' Leary plaque index. In order to match the conditions, Bass tooth brushing technique was instructed to subjects. Students were then randomly divided into 3 groups of 10. The subjects were provided with the three toothbrushes for use in the first, second and third weeks. The plaque index was recorded after using each toothbrush for one week. Paired t-test was used to compare the efficacy of toothbrushes in plaque removal in the same subject while ANOV A was applied for the comparison between the three toothbrushes.Results: Significant reductions were observed in plaque index after using each toothbrush. Plaque index reduction was the highest for Oral B CROSS Action and the lowest for Panberes Classic (P=0.001). Oral B CROSS Action and a significant difference with Panberes Classic in mean plaque index reduction (P=0.018). Panberes CROSS Action and Oral B CROSS Action were not significantly different in this respect (P=0=797).Conclusion: Oral B CROSS Action and Panberes CROSS Action were not significantly different in terms of plaque index reduction. However, the mentioned two toothbrushes had a significant difference in this respect with Panberes Classic.

Foot and Mouth Disease (FMD) vaccine is one of the inactivated vaccines and its potency depends on the antigen quality, antigen concentration per dose, and adjuvant. In this study to introduce the better antigen concentration method, both active and inactive of three serotypes O, A05, and Asia of FMD virus were used. Each of the virus type was cultivated in BHK21 cell culture and half of each viral suspension inactivated by ethylene imine. The physical method; ultra filtration (CROSS flow system) and the chemical method; treatment with poly ethylen glycole (PEG6000) were used for virus concentration following safety assay. The quantity of virus recovery was evaluated by virus adsorption by aluminum hydroxide gel, complement fixation, ELISA, TCID50 titration, and sucrose concentration on the collected samples. The results indicate that the concentration rate did not affect virus adoption by aluminum hydroxide gel and the quantity of virus recovery using ultra filtration was higher than PEG precipitation.

Background: Keratoconus is a progressive disease occurring in adolescence or early twenties. In an eye with keratoconus, the cornea thins and bulges out into an irregular cone shape. Although keratoconus may be seen in one eye, in 90% of cases, both eyes are damaged. CROSS-linking is a novel, very chip, and rapid method to treat keratoconus. Since few studies have evaluated this method we assessed the improvement of keratoconus following CROSS-linking.Methods: This clinical trial study was performed in Feiz Hospital, Iran, during 2010-11. The target population was patients with keratoconus who were scheduled for CROSS-linking. Visual acuity was measured before and after the operation. The collected data was analyzed with SPSS20.Findings: The mean ± SD of visual acuity was -2.66 ± 2.2 before the operation and -2.8 ± 4.7 after the operation (P=0.65). While visual acuity was not changed in 29 patients (29%), it decreased in 43 cases (43%) and increased in 28 (28%).Conclusion: According to the results of this study, CROSS-linking had no acceptable effects on visual acuity in cases of keratovonus. More studies are required to clarify the efficacy of this method in improving keratovonus.

Due to soil bio-diversity, many research projects are undertaken by research laboratories affiliated by large international pharmaceutical companies to identify new medicines as well as new antibiotics. Though few of these new compounds find their way into clinics, this search is still valuable and greatly benefits the owners of those companies. In this project, different stages of a screening method have been carried out. Soil samples from eleven different places in Mashhad, Iran, were taken and their representative microorganisms were isolated. Screening for organisms producing anti-microbial agents resulted in identification of 111 potential isolates. Further studies on the isolation and purification of those agents as well as their cytotoxicity as potential anti-tumor agents are underway.      

Background: Recent studies show that dairy consumption and associated nutrients may be protective against some metabolic disease. Especially in Iran, Peak bone mass is lower than that in normal white western population. Men are not exception in this story too.Material and Method: This CROSS sectional study try to demonstrate the food consumption pattern in a randomize collection of people as staff of different part of a military educating hospital and military students who was resident in dormitory.Result: We found that dairy consumption was less than standard recommendation. The high rate of different metabolic disorder specially bones and teeth may be related to this nutritional behavior.Conclusion: It is important to consider the influence of income, education, sex, ethnicity, marital status, and physical activity on food consumption patterns when planning diets, nutrition education programs and interventions for young adult.