Macro and microanatomy of some organs of a juvenile male Ganges River dolphin (Platanista gangetica spp. gangetica)     

Subrata Kumar Shil  Md. Mahiuddin Zahangir  Bhajan Chandra Das  Mohammad Mahbubur Rahman  Saroj Kumar Yadav  Md. Manzoorul Kibria  AMAM Zonaed Siddiki 《Anatomia, histologia, embryologia》2023,52(2):180-189

Ganges River dolphins (Platanista gangetica spp. gangetica) are air-breathing, warm-blooded mammals endemic to the Ganges and Karnaphuli rivers of the Indian subcontinent. Nevertheless, very little basic histomorphological research has been conducted on this endangered species. Therefore, this study aimed to describe the morphological features of different organs of P. gangetica. Despite becoming aquatic animals, they showed similarities with terrestrial mammals, such as the pair of lungs and an apical bronchus in the respiratory system, which are pretty standard in ruminants and pigs. However, unlike the terrestrial animal, the tracheobronchial tree was stiffer due to circularly arranged anastomosing plates of the hyaline cartilaginous ring in the trachea, cartilaginous plates in the bronchiole, and thick alveolar septa. The digestive system showed a three-chambered mechanical and glandular stomach similar to the artiodactyles. However, the intestine showed smaller caecum like the monogastric mammal. The urogenital system showed lobulated kidneys, a urinary bladder, a fibroelastic penis with sigmoid flexure, and a long urethral process similar to some terrestrial ruminants. Considering the aquatic environment, all those modifications, unlike terrestrial mammals, are necessary for their adaptation. Thus, this research will broadly help our clinicians and conservationist to take further steps toward disease diagnosis and monitoring of marine health of this endangered species.  相似文献   

Determinants of adoption behaviour of the fish farmers of Pabda fish culture (Ompok bimaculatus Bloch, 1794) in Tripura,Northeast India     

Shil  Bikash  Lahiri  Biswajit  Pal  Prasenjit  Ghosh  Amitava  Biswas  Pradyut  Singh  Yumlembam Jackie 《Aquaculture International》2022,30(4):2017-2041

Aquaculture International - Most of the adoption studies in catfish culture were restricted to feeding habits, growth rate and morphological studies, neglecting the social factors and adoption of...  相似文献   

Effect of magnesium on crop yields within maize–green manure–T. aman rice cropping pattern on acid soil     

Shamsun Noor  Sohela Akhter  Nirmal Chandra Shil  Md. Abu Kawochar 《Archives of Agronomy and Soil Science》2013,59(10):1381-1392

An experiment was conducted to study the response of maize to magnesium (Mg) and to find out the residual effect of Mg and green manure (GM) on transplanted aman (T. aman) rice in the maize–GM–T. aman cropping pattern. There were six treatments: T₁ (recommended dose of fertilizer (RDF) + 0 kg Mg + 2 t CaCO₃ ha^?1), T₂ (RDF + 10 kg Mg + 2 t CaCO₃ ha^?1), T₃ (RDF + 20 kg Mg +2 t CaCO₃ ha^?1), T₄ (RDF + 30 kg Mg + 2 t CaCO₃ ha^?1), T₅ (RDF) and T₆ (2 t CaCO₃ ha^?1). The response of maize to Mg was quadratic and the optimum dose of Mg was found to be 19 kg ha^?1, which resulted in maximum yield of 10,507 kg ha^?1. The residual effect of Mg along with GM and reduced dose of chemical fertilizer resulted in significant increase of grain yield of rice. Thus, N₂₅₀P₆₀K₁₀₀Mg₁₉S₄₀Zn₅B₂ kg ha^?1 for maize, only 20 kg N ha^?1 for GM (Sesbania) and N₆₀P₉K₃₃S₁₀Zn₁B₁ kg ha^?1 for T. aman appeared as the best combination for maximizing the productivity and may be recommended for this pattern at non-calcareous light-textured soils of Bangladesh. Application of lime increased soil pH, and this together with fertilizer and GM tended to improve soil fertility and thus may be recommended for soil amelioration.  相似文献   

Molecular characterization of myostatin‐like genes expressed highly in the muscle tissue from Morotoge shrimp,Pandalopsis japonica     

Kyoung Sun Kim  Young‐Ji Kim  Jeong Min Jeon  Yang Soon Kang  Young Shil Kang  Chul Woong Oh  Hyun‐Woo Kim 《Aquaculture Research》2010,41(11):e862-e871

Myostatin is one of the transforming growth factor (TGF)‐β family members and plays inhibitory roles in the development and growth of muscle in mammals. Mammalian myostatins have been studied intensively, considering its medical and industrial potential use. Still, limited information is available about myostatin homologues in crustaceans. In the present study, we isolated for the first time cDNA that encodes for myostatin‐like protein (Pj‐MSTN) from Morotoge shrimp, Pandalopsis japonica. The putative mature peptide of Pj‐MSTN was composed of 109 amino acids, which contains an additional amino acid residue compared with mammalian myostatins. Pj‐MSTN exhibited 32% amino acid sequence identity and 52% similarity to human myostatin. Multiple sequence alignment analysis indicated that Pj‐MSTN shared the conserved proteolytic cleavage site (RXXR) for its maturation and nine cysteine residues for disulphide bridges. These results suggest that Pj‐MSTN has conserved the three‐dimensional structure of TGF‐β family members in vertebrates. Phylogenetic analysis suggests that Pj‐MSTN is a primitive form of vertebrate myostatin and GDF11. The expression of Pj‐MSTN was not just identified in muscular tissues, suggesting that Pj‐MSTN functions differently from mammalian myostatin. Ablation of the X‐organ/sinus gland complex significantly reduced the expression of Pj‐MSTN in most tissues, suggesting its potential association with moulting.  相似文献