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81.
Seyed Jafar Mousavy Gholam Hossein Riazi Mahmood Kamarei Hadi Aliakbarian Naghmeh Sattarahmady Ahmad Sharifizadeh Shahrokh Safarian Faizan Ahmad Ali Akbar Moosavi–Movahedi 《International journal of biological macromolecules》2009,44(3):278-285
Widespread use of mobile phones has increased the human exposure to electromagnetic fields (EMFs). It is required to investigate the effect of EMFs on the biological systems. In this paper the effect of mobile phone RF (910 MHz and 940 MHz) on structure and function of HbA was investigated. Oxygen affinity was measured by sodium dithionite with UV–vis spectrophotometer. Structural changes were studied by circular dichroism and fluorescence spectroscopy. The results indicated that mobile phone EMFs altered oxygen affinity and tertiary structure of HbA. Furthermore, the decrease of oxygen affinity of HbA corresponded to the EMFs intensity and time of exposure. 相似文献
82.
Nasiripourdori A Naderi-Manesh H Ranjbar B Khajeh K 《International journal of biological macromolecules》2009,44(4):311-315
The industrial utilization of savinase is mainly constrained by its stability limitations. In the present study, the irreversible thermoinactivation of savinase has been evaluated at 70 degrees C, and various possible mechanisms for irreversible thermoinactivation of savinase were examined. The main process seemed to be autodigestion of savinase at higher temperatures. To improve the thermal stability of the enzyme, the effect of two co-solvents (sorbitol and trehalose) on the enzyme's activity and stability was investigated. Both osmolytes prevented the autolysis of savinase at 70 degrees C without inactivating the enzyme; furthermore, the structural and kinetic stabilities of the enzyme increased in the presence of additives. 相似文献
83.
Behzad Davarniya Hao Hu Kimia Kahrizi Luciana Musante Zohreh Fattahi Masoumeh Hosseini Fariba Maqsoud Reza Farajollahi Thomas F. Wienker H. Hilger Ropers Hossein Najmabadi 《PloS one》2015,10(8)
Cognitive impairment or intellectual disability (ID) is a widespread neurodevelopmental disorder characterized by low IQ (below 70). ID is genetically heterogeneous and is estimated to affect 1–3% of the world’s population. In affected children from consanguineous families, autosomal recessive inheritance is common, and identifying the underlying genetic cause is an important issue in clinical genetics. In the framework of a larger project, aimed at identifying candidate genes for autosomal recessive intellectual disorder (ARID), we recently carried out single nucleotide polymorphism-based genome-wide linkage analysis in several families from Ardabil province in Iran. The identification of homozygosity-by-descent loci in these families, in combination with whole exome sequencing, led us to identify possible causative homozygous changes in two families. In the first family, a missense variant was found in GRM1 gene, while in the second family, a frameshift alteration was identified in TRMT1, both of which were found to co-segregate with the disease. GRM1, a known causal gene for autosomal recessive spinocerebellar ataxia (SCAR13, MIM#614831), encodes the metabotropic glutamate receptor1 (mGluR1). This gene plays an important role in synaptic plasticity and cerebellar development. Conversely, the TRMT1 gene encodes a tRNA methyltransferase that dimethylates a single guanine residue at position 26 of most tRNAs using S-adenosyl methionine as the methyl group donor. We recently presented TRMT1 as a candidate gene for ARID in a consanguineous Iranian family (Najmabadi et al., 2011). We believe that this second Iranian family with a biallelic loss-of-function mutation in TRMT1 gene supports the idea that this gene likely has function in development of the disorder. 相似文献
84.
The effect of Cl−, HCO3−, Br−, acetazolamide, thiocyanate and amiloride on urine formation in Locusta migratoria Malpighian tubules have been determined. The rate of fluid secretion depends markedly on the concentration of Cl− in the bathing solution with concentrations less than 90 mM resulting in reduced fluid secretion. Substitution of Br− for Cl− had no significant effect on the rate of the fluid secretion. Replacement of NaHCO3 with NaCl in Hepes buffered Ringer solution reduced the rate of urine production by 23%. Fluid secretions were reduced in the presence of 10−4–10−2 M acetazolamide, a carbonic anhydrase inhibitor. The combined effect of acetazolamide in the absence of HCO3− appears to be additive. A 1 mM concentration of thiocyanate, an ionic inhibitor, reduced fluid secretion by 35%. Amiloride interferes with the electrogenic entry of Na+ into the cell and a 1 mM solution reduced fluid secretion by 94% with secretion completely inhibited in 80% of the tubules tested. 相似文献
85.
Tafreshi NKh Sadeghizadeh M Emamzadeh R Ranjbar B Naderi-Manesh H Hosseinkhani S 《The Biochemical journal》2008,415(1):27-33
Eukaryotic-type serine/threonine protein kinases in bacteria have been implicated in controlling a host of cellular activities. PknA is one of eleven such protein kinases from Mycobacterium tuberculosis which regulates morphological changes associated with cell division. In the present study we provide the evidence for the ability of PknA to transphosphorylate mMurD (mycobacterial UDP-N-acetylmuramoyl-L-alanine:D-glutamate-ligase), the enzyme involved in peptidoglycan biosynthesis. Its co-expression in Escherichia coli along with PknA resulted in phosphorylation of mMurD. Consistent with these observations, results of the solid-phase binding assays revealed a high-affinity in vitro binding between the two proteins. Furthermore, overexpression of m-murD in Mycobacterium smegmatis yielded a phosphorylated protein. The results of the present study therefore point towards the possibility of mMurD being a substrate of PknA. 相似文献
86.
SA Rad HS Zahiri KA Noghabi S Rajaei R Heidari L Mojallali 《World journal of microbiology & biotechnology》2012,28(1):313-321
In this study a comparison was made between type 1 and type 2 isopentenyl diphosphate isomerases (IDI) in improving lycopene
production in Escherichia coli. The corresponding genes of Bacillus licheniformis and the host (i
Bl
and i
Ec
, respectively) were expressed in lycopene producing E. coli strains by pTlyciBl and pTlyciEc plasmids, under the control of tac promoter. The results showed that the overexpression of i
Ec
improved the lycopene production from 33 ± 1 in E. coli Tlyc to 68 ± 3 mg/gDCW in E. coli TlyciEc. In contrast, the expression of i
Bl
increased the lycopene production more efficiently up to 80 ± 9 mg/gDCW in E. coli TlyciBl. The introduction of a heterologous mevalonate pathway to elevate the IPP abundance resulted in a lycopene production up
to 132 ± 5 mg/gDCW with i
Ec
in E. coli TlyciEc-mev and 181 ± 9 mg/gDCW with i
Bl
in E. coli TlyciBl-mev, that is, 4 and 5.6 times respectively. When fructose, mannose, arabinose, and acetate were each used as an auxiliary
substrate with glycerol, lycopene production was inhibited by different extents. Among auxiliary substrates tested, only citrate
was an improving one for lycopene production in all strains with a maximum of 198 ± 3 mg/gDCW in E. coli TlyciBl-mev. It may be concluded that the type 2 IDI performs better than the type 1 in metabolic engineering attempts for isoprenoid
production in E. coli. In addition, the metabolic engineering of citrate pathway seems a promising approach to have more isoprenoid accumulation
in E. coli. 相似文献
87.
Leila Hatami-Baroogh Shahnaz Razavi Hamid Zarkesh-Esfahani Marziyeh Tavalaee Somayeh Tanhaei Kamran Ghaedi Mohamad Reza Deemeh Farzaneh Rabiee Mohammad Hossein Nasr-Esfahani 《Reproductive biology and endocrinology : RB&E》2010,8(1):17
Background
Leptin, a 167 amino acid peptide hormone, profoundly effects reproduction exerting its biological effects via interaction with the leptin receptor (ObR) which is widely expressed on peripheral tissues. In this study, we have attempted to assess leptin receptor expression in the spermatozoa of fertile males and those diagnosed with male factor infertility; both at the mRNA or protein levels. 相似文献88.
Enhanced development of mouse single blastomeres into blastocysts via the simultaneous inhibition of TGF‐β and ERK pathways in microdroplet culture 下载免费PDF全文
Farshid Yekani Mahnaz Azarnia Fereshteh Esfandiari Seyedeh‐Nafiseh Hassani Hossein Baharvand 《Journal of cellular biochemistry》2018,119(9):7621-7630
Optimization of an in vitro culture that supports blastocyst (BL) development from single blastomeres (SBs) is essential to generate additional embryos for farm animals and humans and unravel the mechanisms that underlie totipotency. In this study, we have examined BL development from SBs that were derived from 2‐cell and 4‐cell mouse embryos in different media. Moreover, BLs were assessed for inner cell mass (ICM) by staining with Oct4. We found that BL development was improved in a lower volume of medium (1 µL) compared with a higher volume (5 µL). Furthermore, the supplementation of medium with the inhibitors of ERK1/2 and TGFβ (R2i) signaling pathways in 1 µL droplets of T6 medium improved BL development. The co‐culture of SBs with intact embryos in the presence of R2i showed more BL development and ICM to trophectoderm cell number ratio in comparison with SB culture and SB group culture. We also observed reduced total cell number, ICM, and trophectoderm cell numbers in all of the SB culture conditions versus intact embryo development. These findings might facilitate the successful generation of additional embryos for biomedical applications and elucidate the mechanisms that underlie totipotency. 相似文献
89.
Mohammad Hossein Soleimani Majid Talebi Badraldin Ebrahim Sayed-Tabatabaei 《Plant Systematics and Evolution》2012,298(6):1141-1149
Sequence-related amplified polymorphism (SRAP) was used to assess the genetic diversity of 63 cultivated, wild, and ornamental pomegranate genotypes from five different geographical regions of Iran. A total of 250 fragments were amplified using 13 primer combinations; among these, 133 bands (53?%) were polymorphic. The average PIC value was 0.28 over all PCs. The genetic distance among genotypes ranged from 0.10 to 0.37 with an average of 0.24. Cluster analysis using the neighbor-joining (NJ) method suggested there are close relationships between ornamental and some wild genotypes. Although AMOVA results revealed significant differences in the genetic diversity among the regions (P?=?0.0048), the genetic variation was mainly caused by variation of intra regions. The results indicated low genetic differentiation (Fst?=?0.025) and high gene flow (Nm?=?2.28) among regions. These results confirmed that SRAP markers could be powerful tools and an effective marker system for determining the genetic diversity and population genetic structure of the pomegranate. 相似文献
90.
Gholivand K Mojahed F Salehi M Naderi-Manesh H Khajeh K 《Journal of enzyme inhibition and medicinal chemistry》2006,21(5):521-525
Two novel structurally related phosphoramidate compounds, 1 and 2, with likely beta-diketone system were synthesized and characterized by 1H, 13C, 31P NMR, IR spectroscopy and elemental analysis. Compound 2 exhibited a 31P NMR signal which was significantly shielded (8 ppm) relative to compound 1. Determination of human erythrocyte acetylcholinesterase (hAChE) inhibitory activity was carried out according to Ellman's modified kinetic method and the IC50 values of compounds 1 and 2 were 1.567 and 2.986 mM, respectively. The k(i) values of 1 and 2 were 1.39 to 2.65 min(-1) respectively. A comparison of the bimolecular rate constant (k(i)) and IC50 values for the irreversible inhibitors 1 and 2 revealed that the oxono analogue has greater affinity for hAChE than the thiono compound. Furthermore effects of two conventional oximes paralidoxime (A) and obidoxime (B) on reactivation of the inhibited hAChE were studied but low reactivity was shown by both the oximes. 相似文献