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RISS 인기검색어
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- 저자 : Al Baki, Md. Abdullah (검색결과 14 건)
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Al Baki, Md. Abdullah,Jung, Jin Kyo,Kim, Yonggyun Elsevier 2018 Peptides Vol.106 No.-
<P><B>Abstract</B></P> <P>A disaccharide, trehalose, is a main hemolymph sugar of the legume pod borer, <I>Maruca vitrata</I> larvae, but its titers fluctuated with feeding activity. During diurnal feeding in the photophase, hemolymph trehalose remained at a relatively low level (69 mM) and increased (98 mM) during scotophase. Starvation significantly increased the hemolymph trehalose level, in which the elevation of trehalose titers was dependent on the non-feeding period. The down-regulation of the trehalose level during the active feeding period seemed to result from mediation of the insulin/IGF signal (IIS). Injection of a porcine insulin suppressed the trehalose level in a dose-dependent manner. Genes associated with IIS of <I>M. vitrata</I> were predicted from its larval transcriptome, and their expression was confirmed in different developmental stages and tissues. All seven IIS genes selected were expressed in all developmental stages and different tissues. Silencing of four IIS genes (insulin receptor, Forkhead box O, a serine-threonine protein kinase, target of rapamycin) by RNA interference significantly modulated the hemolymph trehalose level. Starvation treatment changed expression of two trehalose metabolism-associated genes (trehalose phosphate synthase (TPS) and trehalase (TRE)) as well as the IIS genes. Silencing of <I>TPS</I> or <I>TRE</I> expression significantly down- or up-regulated the hemolymph trehalose level, respectively. In addition, silencing of IIS genes altered both <I>TPS</I> and <I>TRE</I> expression, indicating a functional link between IIS and trehalose metabolism. These results suggest that nutrients obtained from feeding activate IIS of <I>M. vitrata</I>, which then down-regulates the hemolymph trehalose level by altering trehalose metabolism.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An ILP/IGF signal (IIS) pathway is predicted from <I>Maruca vitrata</I>. </LI> <LI> Feeding rhythm coincides with IIS expression to maintain plasma trehalose level. </LI> <LI> RNA interference of IIS gene expression resulted in significant increase of plasma trehaloe level. </LI> </UL> </P>
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Age grading and gene flow of overwintered Bactrocera scutellata populations
Abdullah Al Baki,금은선,김현정,송영림,김용균,권기명,박영진 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4
The striped fruit fly, Bactrocera scutellata, belongs to family Tephritidae. It infests pumpkin flowers. It is known to overwinter as adult stage with possible diapause development. However, its overwintering biology remains unclear. The objective of this study was to determine its overwintering regions in Korea. First, overwintering adults were collected and used to measure supercooling point (SCP) to understand its low limit temperature for survival. Male adults exhibited mean SCP at −7.2 °C. During winter, Jeju and some southern mainland regions with temperatures above −7 °C might be overwintering regions for B. scutellata. Based on such putative overwintering zone, male adult monitoring was performed from January to June in five different localities. Jeju and southern mainland regions (Yangsan, Uiryeong) had overwintered populations whereas mid- and northern regions (Andong, Guri) did not have such overwintered population. Amounts of pterin amounts in heads of overwintered populations were most increased in May and June, suggesting adult development and relatively long lifespan. Males collected in late spring possessed melanized testis filled with apparently matured spermatozoa. Genetic distances between overwintered populations of Jeju and mainland regions were measured using random amplification of polymorphic DNA. They showed separate clustering between Jeju and mainland populations. These results indicate that B. scutellata overwinters in both Jeju and southern mainland regions of Korea.
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Insulin/IGF signaling regulates female reproduction by stimulating stem cells in germarium
Md. Abdullah Al Baki,Yonggyun Kim 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04
Insulin/IGF signaling (IIS) regulates different physiological processes such as metabolism, trehalose level, growth, and reproduction. Four IIS components are identified from the bean pod borer, Maruca vitrata (Lepidoptera: Crambidae). RNA interference (RNAi) of insulin receptor (InR), Forkhead Box O (FOXO), Target of Rapamycin (TOR) or Akt led to ovary dysfunction. Especially, the RNAi treatment significantly reduced the stem cell division in the germarium. However, an addition of a porcine insulin stimulated the cell division. Immature diets significantly influenced on the ovarian stem cell development.
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Application of gene expression of insulin signaling pathway to insect growth modeling
Md. Abdullah Al Baki,Yonggyun Kim 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.10
Insect growth depends on temperature and nutrient. Intake nutrients activate insulin signaling pathway, which mediatesthe nutrient signal to coordinate growth in entire body. A subtropical species, Maruca vitrata (Lepidoptera: Crambidae),gives serious damages on various Fabaceae crops. This study predicted seven components (InR, IRS, PI3K, PTEN, Akt,mTOR, FOXO) of the insulin signal and showed that some of the insulin gene expression levels are highly correlatedwith developmental rates. These correlations may be applied to amend a temperature-dependent growth modeling of M.vitrata.
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Validation of insulin signaling pathway using CRISPR-Cas9 in Maruca vitrata
Md. Abdullah Al Baki,Yonggyun Kim 한국응용곤충학회 2019 한국응용곤충학회 학술대회논문집 Vol.2019 No.04
Insulin/IGF signaling (IIS) regulates multiple physiological processes such as larval growth, reproduction, and life span in many organisms including legume pod borer, Maruca vitrata (Lepidoptera: Crambidae). RNA interference of IIS components, insulin receptor (InR) and Forkhead Box O (FOXO), impaired larval growth and female reproduction. To further validate the physiological roles of InR and FOXO, we generated knock-out (KO) mutants using CRISPR/Cas9-mediated genome-editing technology. Both KO mutants exhibited delayed larval growth and reduced pupal and adult body sizes. In conclusion, these results demonstrated the critical role of insulin signaling (IIS) pathway to control M. vitrata growth and development.
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Abdel‐Baki Abdel‐Azeem S.,Aboelhadid Shawky M.,Sokmen Atalay,Al‐Quraishy Saleh,Hassan Ahmed O.,Kamel Asmaa A. 한국곤충학회 2021 Entomological Research Vol.51 No.11
The present study was designed to evaluate the insecticidal activity of different concentrations of Foeniculum vulgare and two of its components, trans-anethole and fenchone, against the different stages of Musca domestica. The tested concentrations were applied through a residual film method and topical application on larvae and pupae respectively. Trans-anethole achieved the best results against larvae when compared with those of the fennel or fenchone with LC50 values of 0.58%, 1.57%, and 17.22%, respectively. Moreover, tans-anethole killed 100% of larvae at concentration of 2.5% and fennel achieved the same effect at concentration of 10%, meanwhile fenchone did not reach such an effect at any of the tested concentrations. At the concentration of 10%, fennel oil and trans-anethole induced morphological deformation in the dead larvae such as shrunk bodies with dark colored integument. Regarding the pupicidal activity, fennel oil showed percentage inhibition rate (PIR) of 100% at the concentration of 10% while the same effect was achieved by trans-anethole at concentration of 5%. On the contrary, fenchone did not show any pupicidal activity. Treatment of the third instar house fly larvae with LC5o of fennel oil, trans-anethole, and fenchone significantly inhibited the acetylcholinestrase (AchE) when compared with the control untreated larvae. Additionally, the glutathione-s-transferase (GST) and malondialdehyde (MDA) production significantly increased in the larvae treated with trans-anethole. The results of the present study indicate that the insecticidal activity of fennel oil was mainly attributed to the presence of trans-anethole as a major constituent.
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Kinematic geometry of a line trajectory in spatial motion
Reem A. Al-Ghefari,Rashad A. Abdel-Baky 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.9
This paper derives the equations of line-trajectory in spatial motion by means of the E. Study dual-line coordinates. A special emphasisgoes to the second-order motion properties for deriving a new proof of the Disteli formulae. As an application concise explicit expressionsof the inflection line congruence are directly obtained. Also, a new metric is developed and used to investigate the geometricalproperties and kinematics of line trajectory as well as Disteli axis. Finally, a theoretical expressions of point trajectories with special valuesof velocity and acceleration, which can be considered as a form Euler-Savary equation, for spherical and planar motions are discussed.
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김용균,Md. Abdullah Al Baki,권기면,김동순,박계청,안정준 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.3
The striped fruit fly, Zeugodacus scutellata, exhibits generation overlap due to its relatively long lifespan. This study clarified the fly generations by age-grading technique and traced migration of local populations using genetic markers. Male adults were monitored using Cue-lure in two different places (Andong and Guri) of mainland Korea during the entire host cultivating period. They showed two occurrence peaks (from late July to early August and from mid-August to mid-October). A developmental model of Z. scutellata using rate summation method predicted four generations during this period. Pterin amounts in fly heads increased with adult age and indicated at least 3 cycles of age variation during the occurrence period with an additional adult generation after the third cycle. The additional peak was supported by field monitoring using protein diet supplemented with terpinyl acetate, which showed an additional occurrence peak during October. These seasonal populations were monitored through their migration by gene flow analysis using randomly amplified polymorphic DNA (RAPD) markers. In each locality, three seasonal populations at July, August, and September were discrete. Although local populations were genetically discrete at July, they were not separate at late seasons except for Jeju populations. These results indicate the usefulness of the head pterin quantification in age-grading of adult populations and suggest that Z. scutellata occurs at least four generations a year. In addition, gene flow analysis using RAPD suggests frequent movements among local populations along with season progression.
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