Effects of the relative time of emergence and the density of common lambsquarters (Chenopodium album) on corn (Zea mays) yield

Sarabi, Vahid,Mahallati, Mehdi Nassiri,Nezami, Ahmad,Mohassel, Mohammad Hasan Rashed The Korean Society of Weed Science and The Turfgra 2011 Weed Biology and Management Vol.11 No.3

Common lambsquarters (Chenopodium album) is one of the world's worst weeds. In order to study the competitive potential of single-cross 704 corn (Zea mays) in competition with common lambsquarters at different relative times of emergence and density levels of the weed, an experiment was conducted in 2006 at the farm of the Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran. This experiment was designed as a split plot based on a randomized complete block design with three replications. The emergence time of the weed was considered at three levels (7 days and 14 days earlier than corn and simultaneously with corn) as the main plot, while the density of the weed was considered at six levels (0, 4, 8, 12, 16, and 20 plants per $m^2$) as the subplot. The results showed a decrease in the grain yield and biomass of corn, as the emergence time of corn was delayed in comparison with the weed in a way that the maximum reduction was observed at the earlier emergence of the weed, compared to corn, and also at a high density of the weed. As the weed emerged earlier than corn, the rate of yield loss resulting from the first flush of weeds was not that high. However, with every few days that the weed emerged earlier than corn, the rate of yield loss became higher as the density of the weed increased to its maximum. The maximum reduction in the yield components was observed at 14 days earlier emergence of the weed, compared to corn, and at high densities, as the corn plants were overshadowed by the weed canopy and no ear was produced.

MGMT-B Gene Promoter Hypermethylation in Patients with Inflammatory Bowel Disease - A Novel Finding

Mokarram, Pooneh,Kavousipour, Soudabeh,Sarabi, Mostafa Moradi,Mehrabani, Golnosh,Fahmidehkar, Mohammad Ali,Shamsdin, Seyedeh Azra,Alipour, Abbas,Naini, Mahvash Alizade Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.5

Inflammatory bowel disease (IBD) is a disease strongly associated with colorectal cancer (CRC) as a well-known precancerous condition. Alterations in DNA methylation and mutation in K-ras are believed to play an early etiopathogenic role in CRC and may also an initiating event through deregulation of molecular signaling. Epigenetic silencing of APC and SFRP2 in the WNT signaling pathway may also be involved in IBD-CRC. The role of aberrant DNA methylation in precancerous state of colorectal cancer (CRC) is under intensive investigation worldwide. The aim of this study was to investigate the status of promoter methylation of MGMT-B, APC1A and SFRP2 genes, in inflamed and normal colon tissues of patients with IBD compared with control normal tissues. A total of 52 IBD tissues as well as corresponding normal tissues and 30 samples from healthy participants were obtained. We determined promoter methylation status of MGMT-B, SFRP2 and APC1A genes by chemical treatment with sodium bisulfite and subsequent MSP. The most frequently methylated locus was MGMT-B (71%; 34 of 48), followed by SFRP2 (66.6 %; 32 of 48), and APC1A (43.7%; 21 of 48). Our study demonstrated for the first time that hypermethylation of the MGMT-B and the SFRP2 gene promoter regions might be involved in IBD development. Methylation of MGMT-B and SFRP2 in IBD patients may provide a method for early detection of IBD-associated neoplasia.

Investigation by Simulation of X-ray Beams Produced via Interactions of Suitable Quasi-monoenergetic Electrons with Solid Targets

Lida Nikzad,Alireza Ehtesami-Sarabi 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.1

X-ray generation by interactions of quasi-monoenergetic electrons with solid lead targets is studied. Various electron energy spectra generated by a laser-plasma accelerator are employed to generateBremsstrahlung and characteristic X-rays. These X-ray photons are simulated by using theMonte Carlo N-Particle Transport Code (MCNP). The present work is mainly focused on exploringthe influence of two parameters of the electron profile, the peak energy (Ep) and the pulse width(E), on X-ray generation. If an electron source with higher Ep and smaller E is used, the efficiencyof X-ray creation is found to be increased in thick targets. However, in thin samples, theelectron profile with lower Ep and larger E dominates.

HYBRID NANOMATERIALS CONTAINING PAMAM, POLYROTAXANE AND QUANTUM DOT BLOCKS

MOHSEN ADELI,REZA SADEGHI SARABI,ELHAM SADEGHI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.3

Pseudopolyrotaxanes, Ps-PR, consisting of α-cyclodextrin rings, polyethylene glycol axes and end triazine groups were prepared and then were capped by amino-functionalized quantum dots, NH2-QDs, to achieve polyrotaxanes. The amino-functionalized QDs stoppers of polyrotaxanes were used as core to synthesize polyamidoamine, PAMAM, dendrons divergently and hybrid nanomaterials were obtained. Synthesized hybrid nanomaterials were characterized by different spectroscopy, microscopy and thermal analysis methods. They were freely soluble in water and their aqueous solutions were stable at room temperature over several months. Due to their biocompatible backbone, high functionality and water solubility synthesized hybrid nanomaterials are promising carriers and probes in cancer diagnosis and therapy.

Synthesis and characterization of magnetic molecularly imprinted polymer nanoparticles for controlled release of letrozole

Majid Abdouss,Ali Asghar Sarabi,Saeedeh Kazemi 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.11

Synthesis and characterization of magnetic letrozole imprinted polymer nanoparticles is described herein for the first time. Magnetic molecularly imprinted polymers (MMIPs) were synthesized by precipitation polymerization using methacrylic acid (MAA) as functional monomer and trimethylolpropane trimethacrylate (TRIM) as crosslinker in the presence of letrozole as template and MAA-modified magnetite nanoparticles as magnetic component. The nanoparticles were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and a vibrating sample magnetometer (VSM). The synthesized MMIP nanoparticles, with particle size of about 100 nm, showed superparamagnetic features with a saturation magnetization of 12.5 emu·g−1 and had thermal stability below 240 oC. The adsorption experiments indicated better template recognition of MMIP than magnetic nonimprinted polymer (MNIP) nanoparticles. Moreover, the release profile of letrozole from MMIP and MNIP revealed the controlled release ability of MMIP nanoparticles for the letrozole anticancer drug. We also found that applying an external alternative magnetic field results in increasing the rate of the drug release.

Promoter Methylation Status of Two Novel Human Genes, UBE2Q1 and UBE2Q2, in Colorectal Cancer: a New Finding in Iranian Patients

Mokarram, Pooneh,Shakiba-Jam, Fatemeh,Kavousipour, Soudabeh,Sarabi, Mostafa Moradi,Seghatoleslam, Atefeh Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.18

Background: The ubiquitin-proteasome system (UPS) degrades a variety of proteins which attach to specific signals. The ubiquitination pathway facilitates degradation of damaged proteins and regulates growth and stress responses. This pathway is altered in various cancers, including acute lymphoblastic leukemia, head and neck squamous cell carcinoma and breast cancer. Recently it has been reported that expression of newly characterized human genes, UBE2Q1 and UBE2Q2, putative members of ubiquitin-conjugating enzyme family (E2), has been also changed in colorectal cancer. Epigenetics is one of the fastest-growing areas of science and nowadays has become a central issue in biological studies of diseases. According to the lack of information about the role of epigenetic changes on gene expression profiling of UBE2Q1 and UBE2Q2, and the presence of CpG islands in the promoter of these two human genes, we decided to evaluate the promoter methylation status of these genes as a first step. Materials and Methods: The promoter methylation status of UBE2Q1 and UBE2Q2 was studied by methylation-specific PCR (MSP) in tumor samples of 60 colorectal cancer patients compared to adjacent normal tissues and 20 non-malignant controls. The frequency of the methylation for each gene was analyzed by chi-square method. Results: MSP results revealed that UBE2Q2 gene promoter were more unmethylated, while a higher level of methylated allele was observed for UBE2Q1 in tumor tissues compared to the adjacent normal tissues and the non malignant controls. Conclusions: UBE2Q1 and UBE2Q2 genes show different methylation profiles in CRC cases.

The role of risk perception, risk communication, and demographic factors in COVID-19 preventive behaviors: an online survey in Iran

Mansour Rezaei,Nader Rajabi Gilan,Ali Almasi,Mehdi Khezeli,Fatemeh Jamshidi Nazar,Zahra Jorjoran Shushtari,Yahya Salimi,Farid Najafi,Neda Sarabi,Shahram Saeidi,Saeid Saeidi 질병관리본부 2022 Osong Public Health and Research Persptectives Vol.13 No.4

Objectives: This study investigated preventive behaviors toward coronavirus disease 2019 (COVID-19) and related factors in a Kurdish Iranian sample.Methods: This online survey was conducted among the population aged 18 and above in Kermanshah Province, in western Iran, in April 2020. Samples were invited and recruited through social media. Data were collected using a questionnaire consisting of 4 sections (questions on demographic variables, risk perception, risk communication, and COVID-19 preventive behaviors) and analyzed using Stata ver. 8.Results: The Pearson correlation test showed that risk communication was significantly correlated with COVID-19 preventive behaviors (r=0.320, p<0.01). In the final model, where the explanatory power increased with the entry of the risk communication variable, the variables explained a total of 14% of variance in COVID-19 preventive behaviors. Sex (β=−0.482), risk perception (β=0.047), and risk communication (β=0.662) were significant determinants.Conclusion: Risk communication and risk perception related to COVID-19, as well as being a woman, were determinants of COVID-19 preventive behaviors.