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Saba Yavari,Mohammad Esmaeil Hassani,Reza Omidbaigi,Sara Yavari,Mohammad Jamal Saharkhiz 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.4
Artificial autotetraploids of dragonhead (Dracocephalum moldavica L.) were introduced by treating young plants with aqueous solutions of colchicine at two stages, consisting of the emergence of cotyledon leaves and of two true leaves. Six colchicine concentrations of 0, 0.05, 0.1, 0.2, 0.5, and 0.75% were treated in each of these stages. Results showed that application of colchicine at two true leaves stage had desirable results as many treated plants grew and also diversity was observed in characteristics of treated plants. Tetraploid plants were identified by primary morphological selection, studding stomata characteristics, numbering of chloroplasts in the stomatal guard cells, and finally using flow cytometric analyses. Comparison of characteristics of tetraploid plants with diploids indicated that the higher level of ploidy in dragonhead caused changes in some morphological and physiological traits and active substances.
Yavari, Parvin,Abadi, Alireza,Amanpour, Farzaneh,Bajdik, Chris Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.5
Background: The generalized gamma distribution statistics constitute an extensive family that contains nearly all of the most commonly used distributions including the exponential, Weibull and log normal. A saturated version of the model allows covariates having effects through all the parameters of survival time distribution. Accelerated failure-time models assume that only one parameter of the distribution depends on the covariates. Methods: We fitted both the conventional GG model and the saturated form for each of its members including the Weibull and lognormal distribution; and compared them using likelihood ratios. To compare the selected parameter distribution with log logistic distribution which is a famous distribution in survival analysis that is not included in generalized gamma family, we used the Akaike information criterion (AIC; r=l(b)-2p). All models were fitted using data for 369 women age 50 years or more, diagnosed with stage IV breast cancer in BC during 1990-1999 and followed to 2010. Results: In both conventional and saturated parametric models, the lognormal was the best candidate among the GG family members; also, the lognormal fitted better than log-logistic distribution. By the conventional GG model, the variables "surgery", "radiotherapy", "hormone therapy", "erposneg" and interaction between "hormone therapy" and "erposneg" are significant. In the AFT model, we estimated the relative time for these variables. By the saturated GG model, similar significant variables are selected. Estimating the relative times in different percentiles of extended model illustrate the pattern in which the relative survival time change during the time. Conclusions: The advantage of using the generalized gamma distribution is that it facilitates estimating a model with improved fit over the standard Weibull or lognormal distributions. Alternatively, the generalized F family of distributions might be considered, of which the generalized gamma distribution is a member and also includes the commonly used log-logistic distribution.
Karyotypic Study on Some Populations of Thymus migricus Klokov & Desj.-Shost.
Alireza Yavari,Vahideh Nazeri,Fatemeh Sefidkon,Mohammad Esmail Hassani 한국원예학회 2010 Horticulture, Environment, and Biotechnology Vol.51 No.2
Five populations of Thymus migricus Klokov & Desj.-Shost., which is endemic to Flora Iranica area, were studied karyologically. Included in the data set were the basic chromosome number, the ploidy level, the total length of the haploid chromosome complement (TLC) and five different measures of karyotype asymmetry. The basic chromosome number of the studied populations was obtained as x = 14. The presence of 28 chromosomes in Heris, Nazloo and Band populations and 56 chromosomes in Jolfa and Ghushchi populations corresponds to diploidy (2n = 2x = 28) and tetraploidy (2n = 4x = 56) levels, respectively. The size of mitotic chromosomes was very small and the mean length varied from 0.69 to 1.42 μm. The smallest chromosomes were observed in Ghushchi population and the largest in Heris population. Jolfa population had the largest total chromosome length and Nazloo population had the smallest value. In all populations, metacentric chromosomes were the most common whereas sub-metacentric chromosomes were rare. Karyotypic indices obtained for five populations revealed that the karyotypes were slightly asymmetrical. A1 index varied from 0.492 to 0.643, interchromosomal asymmetry index (A₂) ranged between 0.020 and 0.102 and Paszko’s asymmetry index (AI) ranged from 0.07 to 0.20. Heris and Jolfa populations were considered to indicate higher levels of karyotypic heterogeneity.
Electrooxidation of single-carbon molecules by nanostructured Pd-decorated spongy ceria
Zahra Yavari,Mahdi Shafiee Afarani,Amir Masoud Arabi,Meissam Noroozifar 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.10
Solution combustion synthesis is proposed to fabricate spongy ceria by using two different fuels for combustion: glycine and urea. As-prepared samples are labeled as SCOGl and SCOUr. The acid-base properties of the cavities and surfaces of specimens are determined by measuring the pH of zero charges. Both SCOGl and SCOUr powders are decorated by the nanostructured Pd (NSPd) by the wetness incorporation. The NSPd-SCOGl and NSPd-SCOUr represent the high mass current density than NSPd as non-supported palladium for the electrooxidation of single-carbon molecules: methanol, formaldehyde and formic acid. The results show that the NSPd-SCOGl and NSPd-SCOUr are exceptional heterogeneous catalysts. The SCO as the support with porous structural network has been affected considerably on the electrochemical surface area, dispersion, and durability of NSPd. On the other hand, it can be effective for removing the poisoning species of the electrooxidation of single-carbon molecules on NSPd through the lattice oxygen, and the activation of an oxidation-reduction cycle between the high and low chemical valences of cerium, leading to improve the electrocatalytic efficiency of NSPd. Finally, it is confirmed the conversion of methanol to formaldehyde, and then to formic acid during electrooxidation by using cyclic voltammetry studies.
Exact Solutions of the Bianchi Types V and IX via Time-dependent Quasi-Maxwell Equations
Morteza Yavari 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.3
The exact solutions of the Einstein field equations for the Bianchi types V and IX in presence ofa perfect fluid via the time-dependent quasi-Maxwell (TQM) equations are investigated by usingthe threading formalism.
Khodadost, Mahmoud,Yavari, Parvin,Babaei, Masoud,Mosavi-Jarrahi, Alireza,Sarvi, Fatemeh,Mansori, Kamyar,Khodadost, Behnam Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.5
Background: Knowledge of cancer incidences is essential for cancer prevention and control programs. Capture-recapture methods have been recommended for reducing bias and increasing the accuracy of cancer incidence estimations. This study aimed to estimate the completeness of gastric cancer registration by the capture-recapture method based on Ardabil population-based cancer registry data. Materials and Methods: All new cases of gastric cancer reported by three sources, pathology reports, death certificates and medical records that reported to Ardabil population-based cancer registry in 2006 and 2008 were enrolled in the study. The duplicate cases based on the similarity of first name, surname and fathers names were identified between sources. The estimated number of gastric cancers was calculated by the log-linear method using Stata 12 software. Results: A total of 857 new cases of gastric cancer were reported from three sources. After removing duplicates, the reported incidence rates for the years 2006 and 2008 were 35.3 and 32.5 per 100,000 population, respectively. The estimated completeness calculated by log-linear method for these years was 36.7 and 36.0, respectively. Conclusions: These results indicate that none of the sources of pathology reports, death certificates and medical records individually or collectively fully cover the incident cases of gastric cancer. We can obtain more accurate estimates of incidence rates using the capture-recapture method.
Piltan, Mohammad,Yavari, Issa,Moradi, Loghman,Zarei, Seyed Amir Korean Chemical Society 2012 대한화학회지 Vol.56 No.3
Poly(ethylene glycol) (PEG) has been used as a sustainable, non-volatile, and environmentally friendly reaction solvent for the synthesis of functionalized benzene/biaryl and fluoren-9-one derivatives from activated acetylenes and 1,3-diones at $100^{\circ}C$. No additional solvent and catalyst are required.
Associations of Demographic and Socioeconomic Factors with Stage at Diagnosis of Breast Cancer
Mohaghegh, Pegah,Yavari, Parvin,Akbari, Mohammad Esmail,Abadi, Alireza,Ahmadi, Farzane Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.4
Background: Stage at diagnosis is one of the most important prognostic factors of breast cancer survival. Because in the breast cancer case this may vary with socioeconomic characteristics, this study was performed to recognize the relationship between demographic and socioeconomic factors with stage at diagnosis in Iran. Materials and Methods: This cross-sectional, descriptive study conducted on 526 patients suffering from breast cancer and registered in Cancer Research Center of Shahid Beheshti University of Medical Sciences from 2008 to 2013. A reliable and valid questionnaire about family levels of socioeconomic status filled in by interviewing the patients via phone. For analyzing the data, Multinomial logistic regression, Kendal tau-b correlation coefficient and Contingency Coefficient tests were executed by SPSS22. Economic status, educational attainment of patient and household head and/or a combination of these were considered as parameters for socioeconomic status. First, the relationship between stage at diagnosis and demographic and socioeconomic status was assessed in univariate analysis then these relationships assessed in two different models of multinomial logistic regression. Results: The mean age of the patients was 48.3 (SD=11.4). According to the results of this study, there were significant relationships between stage at diagnosis of breast cancer with patient education (p=0.011), living place (p=0.044) and combined socioeconomic status (p=0.024). These relationships persisted in multiple multinomial logistic regressions. Other variables, however, had no significant correlation. Conclusions: Patient education, combined socioeconomic status and living place are important variables in stage at diagnosis of breast cancer in Iranian women. Interventions have to be applied with the aim of raising women's accessibility to diagnostic and medical facilities and also awareness in order to reducing delay in referring. In addition, covering breast cancer screening services by insurance is recommended.