Papers by Md. Monwar Hossain
Bangladesh Journal of Zoology
not available Bangladesh J. Zool. 49(1): 161-167, 2021
Jahangirnagar University Journal of Biological Sciences, 2016
Butterfly is one of the amazing creatures of nature, which possesses some interesting behavior li... more Butterfly is one of the amazing creatures of nature, which possesses some interesting behavior like puddling that includes feeding at mud, dung or carrion. A total of 54 species of butterflies under 8 families were found to gather around two different puddle grounds viz. Jahangirnagar University campus (JU campus) and bank of Bangshi river (BBR), Savar, Dhaka during January 2012 to December 2013. Among the recorded 54 species of butterflies, 6 species belonged to the family Papilionidae, 11 species to Pieridae, 10 species to Lycaenidae, 3 species to Danaidae, 13 species to Nymphalidae, 7 species to Satyridae, 3 species to Hesperiidae and 1 species to Acraeidae. In JU campus several types of puddling sources were used by butterflies viz. mud or wet soil, dung, carrion, wet sands and wet bricks, human sweat, bird-dropping, rotten fruits and flowers. On the other hand, in the bank of Bangshi river, butterflies used polluted water on the river side. In those puddle sources, members of P...
Butterfly is one of the amazing creatures of nature, which possesses some interesting behavior li... more Butterfly is one of the amazing creatures of nature, which possesses some interesting behavior like puddling that includes feeding at mud, dung or carrion. A total of 54 species of butterflies under 8 families were found to gather around two different puddle grounds viz. Jahangirnagar University campus (JU campus) and bank of Bangshi river (BBR), Savar, Dhaka during January 2012 to December 2013. Among the recorded 54 species of butterflies, 6 species belonged to the family Papilionidae, 11 species to Pieridae, 10 species to Lycaenidae, 3 species to Danaidae, 13 species to Nymphalidae, 7 species to Satyridae, 3 species to Hesperiidae and 1 species to Acraeidae. In JU campus several types of puddling sources were used by butterflies viz. mud or wet soil, dung, carrion, wet sands and wet bricks, human sweat, bird-dropping, rotten fruits and flowers. On the other hand, in the bank of Bangshi river, butterflies used polluted water on the river side. In those puddle sources, members of P...
Bangladesh Journal of Zoology, 2016
not availableBangladesh J. Zool. 43(2): 321-326, 2015
EcR expression in the prothoracicotropic hormone-producing neurosecretory cells of the Bombyx mori brain.: An indication of the master cells of insect metamorphosis
Febs Journal, 2006
The steroid hormone 20-hydroxyecdysone (20E) initiates insect molting and metamorphosis through b... more The steroid hormone 20-hydroxyecdysone (20E) initiates insect molting and metamorphosis through binding with a heterodimer of two nuclear receptors, the ecdysone receptor (EcR) and ultraspiracle (USP). Expression of the specific isoforms EcR-A and EcR-B1 governs steroid-induced responses in the developing cells of the silkworm Bombyx mori. Here, analysis of EcR-A and EcR-B1 expression during larval-pupal development showed that both genes were up-regulated by 20E in the B. mori brain. Whole-mount in situ hybridization and immunohistochemistry revealed that EcR-A and EcR-B1 mRNAs and proteins were exclusively located in two pairs of lateral neurosecretory cells in the larval brain known as the prothoracicotropic hormone (PTTH)- producing cells (PTPCs). In the pupal brain, EcR-A and EcR-B1 expression was detected in tritocerebral cells and optic lobe cells in addition to PTPCs. As PTTH controls ecdysone secretion by the prothoracic gland, these results indicate that 20E-responsive PTP...
EcR expression in the prothoracicotropic hormone-producing neurosecretory cells of the Bombyx mori brain
FEBS Journal, 2006
The steroid hormone 20-hydroxyecdysone (20E) initiates insect molting and metamorphosis through b... more The steroid hormone 20-hydroxyecdysone (20E) initiates insect molting and metamorphosis through binding with a heterodimer of two nuclear receptors, the ecdysone receptor (EcR) and ultraspiracle (USP). Expression of the specific isoforms EcR-A and EcR-B1 governs steroid-induced responses in the developing cells of the silkworm Bombyx mori. Here, analysis of EcR-A and EcR-B1 expression during larval-pupal development showed that both genes were up-regulated by 20E in the B. mori brain. Whole-mount in situ hybridization and immunohistochemistry revealed that EcR-A and EcR-B1 mRNAs and proteins were exclusively located in two pairs of lateral neurosecretory cells in the larval brain known as the prothoracicotropic hormone (PTTH)- producing cells (PTPCs). In the pupal brain, EcR-A and EcR-B1 expression was detected in tritocerebral cells and optic lobe cells in addition to PTPCs. As PTTH controls ecdysone secretion by the prothoracic gland, these results indicate that 20E-responsive PTPCs are the master cells of insect metamorphosis.
The insect brain is the center of developmental control, from which ecdysone governs brain morpho... more The insect brain is the center of developmental control, from which ecdysone governs brain morphogenesis and regulates gene-expression cascades associated with molting and metamorphosis. In order to identify the 20-hydroxyecdysone (20E)-inducible genes responsible for molting and metamorphosis, we constructed a 20E-induced subtraction complementary DNA library from the fifth instar larval brain of the silkworm Bombyx mori. We isolated 10 genes, designated as bombeil-1 to bombeil-10, three of which did not show any sequence similarity to previously identified Bombyx genes. Whole-mount in situ hybridization revealed that all of these bombeil messenger RNAs were exclusively located in two pairs of lateral neurosecretory cells in the larval brain, known as prothoracotropic hormone (PTTH)-producing cells. RNA-interference knockdown targeting bombeil-2 resulted in larval-pupal molt defects, and adult wing and leg malformations. These results, together with the cell-specific co-localization of bombeil transcripts with PTTH, suggest that bombeil genes play important roles during larval-pupal-adult development.
The insect brain is the center of developmental control, from which ecdysone governs brain morpho... more The insect brain is the center of developmental control, from which ecdysone governs brain morphogenesis and regulates gene expression cascades associated with molting and metamorphosis. In order to identify the 20-hydroxyecdysone (20E)-inducible genes responsible for molting and metamorphosis, we constructed a 20E-induced subtraction complementary DNA library from the fifth instar larval brain of the silkworm Bombyx mori. We isolated 10 genes, designated as bombeil-1 to bombeil-10, three of which did not show any sequence similarity to previously identified Bombyx genes. Whole-mount in situ hybridization revealed that all of these bombeil messenger RNAs were exclusively located in two pairs of lateral neurosecretory cells in the larval brain, known as prothoracicotropic hormone (PTTH)-producing cells. RNA-interference knockdown targeting bombeil-2 resulted in larval-pupal molt defects, and adult wing and leg malformations. These results, together with the cell-specific co-localization of bombeil transcripts with PTTH, suggest that bombeil genes play important roles during larval-pupal-adult development.
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Papers by Md. Monwar Hossain