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1.
Sublethal effects of hexaflumuron on development and reproduction of the diamondback moth,Plutella xylostella (Lepidoptera: Yponomeutidae) 总被引:1,自引:0,他引:1
Mohammad Mahmoudvand Habib Abbasipour Aziz Sheikhi Garjan Ali Reza Bandani 《Insect Science》2011,18(6):689-696
Abstract Effects of hexaflumuron at 10% lethal concentration (LC10) and LC25 on development and reproduction parameters of the diamondback moth, Plutella xylostella (Linnaeus, 1753) (Lep.: Yponomeutidae) were investigated. Estimated LC50, LC10 and LC25 values of leaf dip bioassay of hexaflumuron on the third instar larvae of the P. xylostella were 1.48, 0.59 and 0.91 mg/L, respectively. Hexaflumuron decreased pupal weight in the parent generation at sublethal concentrations but in the offspring generation, this effect was not observed. Sublethal concentrations increased egg, first and second larval instar and pupa developmental time and shortened life span of adults, but did not change the third and fourth larval instars and pre‐pupa developmental period. Also fecundity of females reduced significantly but hatchability of treatments and control were similar. Survival rate of pre‐adult stages declined significantly at LC25 concentration. Reproduction parameters such as reproductive rate (R0) and intrinsic rate of increase in sublethal concentrations were significantly lower compared with control, but gross reproduction rate (GRR) at the LC10 concentration was increased and it could be hormoligosis. Also hexaflumuron significantly increased doubling time (Dt). We conclude that the sublethal effects of hexaflumuron might exhibit significant effects on the population dynamics of P. xylostella. 相似文献
2.
Ghofrani Narges Soltani Sheikhi Maedeh Amirzakaria Javad Zamani Hassani Sorour Aminzadeh Saeed Haghbeen Kamahldin 《The protein journal》2021,40(5):689-698
The Protein Journal - As a safe substitute for hydroquinone, β-arbutin, a natural plant substance, and its synthetic counterpart, α-arbutin, are used in depigmentation formulations.... 相似文献
3.
Razzaghi-Abyaneh M Shams-Ghahfarokhi M Eslamifar A Schmidt OJ Gharebaghi R Karimian M Naseri A Sheikhi M 《Mycopathologia》2006,161(4):245-249
The effects of Akacid plus, a novel guanidine-based polymer first introduced as a biocidal and disinfectant agent were studied on Aspergillus parasiticus growth and its aflatoxin (AF) productivity. The fungus was cultured on yeast extract-sucrose (YES) broth in presence of various twofold serial dilutions of 25% Akacid plus (1.5-96 microL/50 mL medium) and then incubated in shaking condition with 150 rev./min at 28 degrees C for 96 h. Based on obtained results, Akacid plus was found to significantly inhibit both growth and aflatoxin B1 (AFB1) synthesis in very low concentrations in a dose-dependent manner. Fungal growth inhibition was determined in the range of 9.6-99.6% in mycelia exposed to the total concentration range of 1.5-48 microL. A final concentration of 96 microL was necessary to completely inhibit the growth of fungus. Under similar conditions, AFB1 synthesis was found to be strongly inhibited by 8.1-98.0% in presence of 1.5-24 microL Akacid plus with a maximum of 100% by 48 microL concentration. With respect to the unique physico-chemical properties of Akacid plus, its marked inhibitory effects on A. parasiticus growth and its AFB1 synthesis shown for the first time in this study make it a promising candidate for application in prevention programmes of AF contamination of susceptible crops. 相似文献
4.
Fatemeh Sheikhi Mohammad Roayaei Ardakani Naeimeh Enayatizamir Susana Rodriguez-Couto 《Indian journal of microbiology》2012,52(4):701-707
Ligninolytic enzyme complexes are involved in lignin degradation. Among them laccases are outstanding because they use molecular oxygen as a co-substrate instead of hydrogen peroxide as used by peroxidases. Bacterial laccase of Bacillus genus was first reported in Claus and Filip (Microbiol Res 152:209–216, 1997), since then more bacterial laccases have been found. In this research, laccase-producing bacteria were screened from pulp and paper industry wastewater, bagass and sugarcane rhizosphere. Nutrient agar medium containing 0.5 mM of guaiacol was used. It was observed that the laccase-producing strains developed brown colour from which 16 strains of Bacillus were identified. One of the isolated strains was identified as Bacillus subtilis WPI based on the results of biochemical tests and 16S rDNA sequence analysis. This strain showed laccase-like activity towards the oxidizing substrates ABTS and guaiacol. In this study guaiacol was used as the substrate of laccase activity assay. For determination of laccase activity of this isolate guaiacol was used as a substrate of assay for the first time in this study. SDS-PAGE and Native-PAGE confirmed the presence of laccase. 相似文献
5.
Mohammad Mahmoudvand Habib Abbasipour Aziz Sheikhi Garjan Ali Reza Bandani 《Applied Entomology and Zoology》2011,46(1):75-80
The effects of sublethal concentrations of indoxacarb on Plutella xylostella (L.) (Lepidoptera: Yponomeutidae) were examined. In comparison with the control, sublethal concentrations led to a significant
decrease in adult emergence, the percentage of pupation and pupal weight of the parent generation, fecundity, and adult longevity.
They also significantly decreased the net reproductive rate (R
0), intrinsic rate of increase (r
m), finite rate of increase (λ), and gross reproduction rate (GRR), and had significantly increased egg developmental time
and doubling time (Dt) of P. xylostella. However, sublethal concentrations of indoxacarb had no significant affect on adult emergence, percentage of pupation, larva,
prepupa and pupa developmental periods, hatchability, and sex ratio of offspring. The results of this study indicated that
sublethal concentrations can decrease the biological parameters of P. xylostella. 相似文献
6.
Chengbin Xue Huifang Xie James Eichenbaum Yi Chen Yonggang Wang Floor W. van den Dolder Junmin Lee KangJu Lee Shiming Zhang Wujin Sun Amir Sheikhi Samad Ahadian Nureddin Ashammakhi Mehmet R. Dokmeci Han‐Jun Kim Ali Khademhosseini 《Biotechnology journal》2020,15(8)
Injectable shear‐thinning biomaterials (iSTBs) have great potential for in situ tissue regeneration through minimally invasive therapeutics. Previously, an iSTB was developed by combining gelatin with synthetic silicate nanoplatelets (SNPs) for potential application to hemostasis and endovascular embolization. Hence, iSTBs are synthesized by varying compositions of gelatin and SNPs to navigate their material, mechanical, rheological, and bioactive properties. All compositions (each component percentage; 1.5–4.5%/total solid ranges; 3–9%) tested are injectable through both 5 Fr general catheter and 2.4 Fr microcatheter by manual pressure. In the results, an increase in gelatin contents causes decrease in swellability, increase in freeze‐dried hydrogel scaffold porosity, increase in degradability and injection force during iSTB fabrication. Meanwhile, the amount of SNPs in composite hydrogels is mainly required to decrease degradability and increase shear thinning properties of iSTB. Finally, in vitro and in vivo biocompatibility tests show that the 1.5–4.5% range gelatin–SNP iSTBs are not toxic to the cells and animals. All results demonstrate that the iSTB can be modulated with specific properties for unmet clinical needs. Understanding of mechanical and biological consequences of the changing gelatin–SNP ratios through this study will shed light on the biomedical applications of iSTB on specific diseases. 相似文献
7.
Mohammad MAHMOUNDVAND Habib ABBASIPOUR Aziz Sheikhi GARJAN Ali Reza BANDANI 《昆虫学报》2010,53(12):1424-1428
化学防治是世界各地防治小菜蛾Plutella xylostella (L.)的主要方法。选择对小菜蛾各发育阶段高效的杀虫剂有助于很好地控制这一害虫。本研究用浸叶法测定了茚虫威和六伏隆对小菜蛾卵、幼虫和成虫的毒性。茚虫威和六伏隆对小菜蛾卵的LC50值分别为201.40 和 37.32 mg/L。茚虫威和六伏隆对3龄幼虫也有很好的毒性(茚虫威的LC50 为 4.82 mg/L; 六伏隆的LC50 为1.48 mg/L)。对成虫的毒性结果表明, 这两种杀虫剂对成虫均没有理想的毒性(茚虫威的LC50 为845.20 mg/L; 六伏隆的LC50 为3 438 mg/L)。根据计算的LC50值, 六伏隆对小菜蛾卵和幼虫的毒性比茚虫威高, 但是茚虫威对成虫的毒性更高。 相似文献
8.
Negar Dinarvand Hossein Khanahmad Sayyed Mohammadreza Hakimian Abdolkarim Sheikhi Bahman Rashidi Hadi Bakhtiari Morteza Pourfarzam 《Journal of cellular physiology》2020,235(7-8):5835-5846
Breast cancer (BC) is an important cause of female cancer-related death. It has recently been demonstrated that metabolic disorders including lipid metabolism are a hallmark of cancer cells. Lipin-1 is an enzyme that displays phosphatidate phosphatase activity and regulates the rate-limiting step in the pathway of triglycerides and phospholipids synthesis. The objective of this study was to evaluate lipin-1 expression, its prognostic significance, and its correlation with p53 tumor suppressor in patients with BC. In this study, 55 pairs of fresh samples of BC and adjacent noncancerous tissue were used to analyze lipin-1, using quantitative real-time polymerase chain reaction and immunohistochemistry (IHC) staining. The expression of other clinicopathological variables and p53 was also examined using IHC technique. The cell migration was studied in MCF-7 and MDA-MB231 cells following the inhibition of lipin-1 by propranolol. Our results show that the relative expression of lipin-1 messenger RNA was significantly higher in BC tissues compared with the adjacent normal tissue and its inhibition reduced cell migration in cancer cells. This upregulation was negatively correlated with histological grade of tumor and p53 status (p = .001 and p = .034) respectively and positively correlated with the tumor size (p = .006). Our results also seem to indicate that the high lipin-1 expression is related to a good prognosis in patients with BC. The expression of lipin-1 may be considered as a novel independent prognostic factor. The inhibition of lipin-1 may also have therapeutic significance for patients with BC. The correlation between lipin-1 and p53 confirms the role of p53 in the regulation of lipid metabolism in cancer cells. 相似文献
9.
Bahadori-Haghighi Shahram Ghayour Rahim Sheikhi Mohammad Hossein 《Plasmonics (Norwell, Mass.)》2019,14(2):447-456
Plasmonics - Graphene-based optical switches are one of the promising building blocks for future optical integrated circuits. For the first time in this paper, a novel all-optical graphene-based... 相似文献
10.
Shoot meristem: an ideal explant for Zea mays L. transformation. 总被引:1,自引:0,他引:1
R V Sairam M Parani G Franklin Z Lifeng B Smith J MacDougall C Wilber H Sheikhi N Kashikar K Meeker D Al-Abed K Berry R Vierling S L Goldman 《Génome》2003,46(2):323-329
We report on a rapid high-frequency somatic embryogenesis and plant regeneration protocol for Zea mays. Maize plants were regenerated from complete shoot meristem (3-4 mm) explants via organogenesis and somatic embryogenesis. In organogenesis, the shoot meristems were directly cultured on a high-cytokinin medium comprising 5-10 mg x L(-1) 6-benzylaminopurine (BAP). The number of multiple shoots produced per meristem varied from six to eight Plantlet regeneration through organogenesis resulted in just four weeks. Callus was induced in five days of incubation on an auxin-modified Murashige and Skoog (MS) medium. Prolific callus, with numerous somatic embryos, developed within 3-4 weeks when cultured on an auxin medium containing 5 mg 2,4-dichlorophenoxyacetic acid x L(-1). The number of multiple shoots varied from three to six per callus. Using R23 (Pioneer, Hi-Bred, Johnston, Iowa), the frequency of callus induction was consistently in excess of 80% and plant regeneration ranged between 47 and 64%. All regenerated plantlets survived in the greenhouse and produced normal plants. Each transgenic plant produced leaves, glumes, and anthers that uniformly expressed green fluorescent protein (GFP). The GFP gene segregated in the pollen. Based on this data it is concluded that the transgenics arose from single-cell somatic embryos. The rate of transfer DNA (T-DNA) transfer to complete shoot meristems of Zea mays was high on the auxin medium and was independent of using super-virulent strains of Agrobacterium. 相似文献