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Reproductive Isolating Mechanisms in the Bangladesh Coastal Bullfrog Hoplobatrachus litoralis and Its Congeneric Species Revealed by Crossing Experiments and Examination on Spermatogenesis of the Hybrids

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Asian Herpetological Research 2017年第1期18卷 27-38页

作者： Mahmudul hasan Mohammed Mafizul ISLAM md. Mukhlesur Rahman KHAN Ratanasate WANICHANON Atsushi KURABAYASHI Masayuki NUMIDA Amphibian Research Center Hiroshima University 1-3-1 Kagamiyama Higashihiroshima 739-8526 Japan Department of Fisheries Biology and Genetics Bangladesh Agricultural University Mymensingh-2202 Bangladesh Department of Anatomy Phramonkutklao Medical College Rajawithi Rd. Bangkok 10400 Thailand 1-6-15 Ushitaasahi Higashi ku Hiroshima 732-0067 Japan

To elucidate reproductive isolating mechanisms in the Bangladesh coastal bullfrog Hoplobatrachus litoralis and its congeneric species, we performed crossing experiments using three species： H. litoralis, H. tigerinus and H. rugulosus. In addition, we conducted histological observations on spermatogenesis of the hybrids. The reciprocal hybrids between H. litoralis and H. tigerinus developed normally with somewhat lower viability at the metamorphosis stage compared with the controls. Most of the metamorphosed frogs became mature. On the other hand, almost all hybrids between female H. rugulosus and male H. litoralis or H. tigerinus died of underdevelopment at the tadpole stage, and only a few hybrids metamorphosed normally and survived to maturity. The inner structures of the testes of the control H. litoralis and H. tigerinus were completely normal, with seminiferous tubules filled with compact bundles of normal spermatozoa. Those of the reciprocal hybrids between H. litoralis and H. tigerinus were almost normal or slightly abnormal, with seminiferous tubules that contained pycnotic nuclei in addition to normal bundles of normal spermatozoa, which demonstrates slight abnormalities in spermatogenesis. In contrast, the hybrids between female H. rugulosus and male H. litoralis or H. tigerinus had no bundles of spermatozoa nor spermatids in the seminiferous tubules, which indicates entirely abnormal spermatogenesis. Meiotic chromosome figures in the reciprocal hybrids between H. litoralis and H. tigerinus showed slight abnormalities, with the occurrence of univalents and increase of rod-shaped bivalents. These results indicate that H. litoralis and H. tigerinus are not isolated from each other by hybrid inviability nor by hybrid sterility, although the hybrids showed somewhat abnormal spermatogenesis in hybrids and that H. rugulosus is isolated from both H. litoralis and H. tigerinus by incomplete hybrid inviability and complete hybrid sterility.

关键词： Hoplobatrachus reproductive isolation interspecific hybrids spermatogenesis meiotic chromosomes

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Chemically and biologically activated biochars slow down urea hydrolysis and improve nitrogen use efficiency

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Pedosphere 2023年第4期33卷 659-669页

作者： Nazmul H.ANTOR Shamim MIA md.M.hasan Nowrose J.LIPI Keiji JINDO Miguel A.SANCHEZ-MONEDERO md.H.RASHID Department of Agronomy Patuakhali Science and Technology UniversityDumkiPatuakhali 8602(Bangladesh) Agrosystems Research Groups Wageningen University and ResearchWageningen 6700 AA(The Netherlands) Department of Soil and Water Conservation and Organic Waste Management Spanish National Research Council(CEBAS-CSIC)Murcia 30100(Spain)

Biochar is considered a potential technology to enhance chemical fertilizer use efficiency through intensification of the interactions between nutrients and the functional groups on biochar ***,little is known about how the application of activated biochars mixed with urea influences nitrogen(N)mineralization and crop performance in paddy ***,a sawdust-derived fresh biochar(FBC)(ca.400℃)was activated chemically with 15%hydrogen peroxide and biologically with a nutrient solution mixed with a soil inoculum to obtain a chemically activated biochar(CBC)and a biologically activated biochar(BBC),*** chemical and surface properties of FBC,CBC,and BBC were evaluated using spectroscopic methods,i.e.,Fourier transform infrared spectroscopy and 13C nuclear magnetic resonance,and potentiometric charge *** N retention capacity of biochars and their interaction with urea hydrolysis were examined in a laboratory incubation ***,a field experiment was carried out in a paddy field with the biochars unmixed or mixed with urea at a 1:1 *** results showed that negative surface functional groups and negative charges were increased on both activated biochars,especially *** activated biochars contributed to a significant reduction in urea-biochar suspension pH and increased N retention in the incubation *** the enhanced surface properties of the activated biochars,no similar increases in rice biomass and grain yield were observed for these biochars in the field ***,rice biomass,grain yield,apparent N use efficiency,and agronomic N use efficiency were significantly higher with the application of the three biochars compared to no-biochar ***,the results indicate that the application of urea mixed with biochar could enhance crop performance,especially in the case of activated biochar,which would enhance N retention in the soil,reducing N loss.

关键词： chemical property crop yield functionalized biochar nitrogen uptake nutrient use efficiency pyrolysis

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Pervasiveness of microplastics in the gastrointestinal tract of some selected fish species from Turag River alongside the capital city of Bangladesh

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Emerging Contaminants 2024年第3期10卷 77-85页

作者： HM Shahnewaz Khan Jabed hasan Mohammed Manik Murad Ahmed Farukh md Shahjahan Department of Environmental Science Bangladesh Agricultural UniversityMymensingh2202Bangladesh Laboratory of Fish Ecophysiology Department of Fisheries ManagementBangladesh Agricultural UniversityMymensingh2202Bangladesh

Microplastics(MPs)are synthetic contaminants that have received global attention due to their ubiquitous occurrence,extreme durability,and capacity to harm ecosystems and human *** study investigated the occurrence of MPs in three fish species(Channa striata,Puntius sophore and Anabas testudineus)collected from two locations(Ashulia Bridge and Mirpur Road)of the Turag River,which flows alongside the Dhaka city,*** abundance(items/individuals)was highest in Channa striata(3.8±0.6)from the Ashulia Bridge area and lowest in Puntius sophore(1.8±0.4)from the Mirpur Road *** was found to be the most dominant(89e93%)form of MPs followed by fragments(21 e35%),films(0e26%)and foams(0e5%).The dominant color of MPs was blue(69e83%),then red(20 e33%),black(11e14%),green(8e20%),and purple(6e8%).The majority(56e71%)of the MPs assessed were<0.5 mm in size,followed by 0.5e1.0 mm(29e33%)and 1e5 mm(38e53%).ATR-FTIR examination revealed three specific polymer varieties-PP(40%),PS(30%)and LDPE(30%).The results of this study provided a baseline of MPs pollution in one of the major protein sources freshwater fishes and raised concern on public health particularly who consume fishes from the urban waterways.

关键词： Microplastics Polymer Bangladesh Turag river ATR-FTIR

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Some reproductive and biometric features of the endangered Gangetic Leaf Fish,Nandus nandus(Hamilton,1822):Implication to the baor fisheries management in Bangladesh

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Aquaculture and Fisheries 2021年第6期6卷 634-641页

作者： md Mahamudul hasan Mredul md Rushna Alam Antara Binta Akkas Sadia Sharmin Shib Nath Pattadar md Lokman Ali Faculty of Fisheries Patuakhali Science and Technology UniversityDumkiPatuakhali8602Bangladesh School of Environmental and Life Sciences University of New CastleCallaghanNSW2308Australia Department of Coastal Studies and Disaster Management University of BarisalBarisal8200Bangladesh School of Environment and Natural Resources The Ohio State UniversityColumbusOH43210USA

This study reflects the biometric characters of the endangered species Nandus nandus(Hamilton,1822)including sex ratio,length-length relationships(LLRs),and length-weight relationships(LWRs)utilizing the sum of 14 linear variables,various meristic measurements,reproductive biology,and condition factor from the Borni Baor,a large wetland ecosystem of southwestern Bangladesh.A total of 579 specimens of *** have been periodically collected from the Borni Baor throughout the year(January-December,2019)using different traditional fishing *** significant LLRs(r^(2)>0.90)values indicate that length parameters are profoundly associated with one *** the LWR formula(W=aL^(b)),higher exponent b values(b>3.0)were demonstrating a positive allometric growth with a high correlation coefficient(r^(2)>0.94).Moreover,monthly gonadosomatic index and dobriyal index fluctuations suggest the primary breeding season of this fish is from March to *** revealed the breeding time was associated strongly with the rainfall and air temperature(p<0.05).The results of our study exposed a cutting-edge biometric feature of this endangered species that would be applicable for fish stock evaluation and making management strategies and conservation policy for this valuable fish resource.

关键词： Sex ratio Length-length relationship Length-weight relationship GSI Baors

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Sources of Nitrogen in Combination with Systems of Irrigation Influence the Productivity of Modern Rice(Oryza sativa L.)Cultivars during Dry Season in Sub-Tropical Environment

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Phyton-International Journal of Experimental Botany 2022年第8期91卷 1687-1708页

作者： Uttam Kumer Sarker md.Romij Uddin Ahmed Khairul hasan md.Abdur Rahman Sarkar md.Abdus Salam md.Alamgir Hossain Eldessoky S.Dessoky Ismail A.Ismail Department of Agronomy Bangladesh Agricultural UniversityMymensingh2202Bangladesh Department of Crop Botany Bangladesh Agricultural UniversityMymensingh2202Bangladesh Department of Biology College of ScienceTaif UniversityTaif21944Saudi Arabia

In irrigated agricultural systems,nitrogen(N)and water are the vital resources for sustainability of the crop production in the modern era of climate *** current study aimed to assess the impact of water and N management on the productivity of irrigated rice *** the context,a field observation was done at the research farm of Bangladesh Agricultural University,Mymensingh,during dry seasons in consecutive two years(2018–2019 and 2019–2020).The experiments were set up following split-plot design assigning water management in the main plots,nitrogen management in the sub-plots,and the cultivars were approved in the split-split plot with three *** two years observation,it was revealed that rice cultivar Binadhan-8 gave the maximum value of leaf area index,number effective tillers hill-1 and grains panicle-1 which lead to the higher grain yield(GY).Substantial relationships were observed among the concentration of N,growth,total dry matter(TDM)and N content,N uptake,N utilization effectiveness,and ***,with little exception,the Combined effect of water and N,cultivars and water management were varied significantly for all ***,the results of the current study concluded that application of irrigation at 8 days after the disappearance of ponded water and source of 105 kg N ha-1 from PU+Poultry manure are the best management approach for the excellent performance of rice cultivar Binadhan-8.

关键词： Growth stage high yielding rice cultivar internal N use efficiency water productivity

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Phase change material-based rooftop on public transport for thermal management

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Energy Storage and Saving 2023年第4期2卷 549-558页

作者： md Araf Hossan Shams Al Deen Aryan md.Sajadul Haque Noman Dewan hasan Ahmed Department of Mechanical and Production Engineering Ahsanullah University of Science and TechnologyDhakaBangladesh

Phase change materials(PCMs)are used in buildings and automobiles to control the interior temperature,following to their high thermal storage capacity and energy *** summer,controlling the interior temperature of vehicles can be difficult,especially in cities where public transportation is excessively ***,heating,ventilation,and air-conditioning systems are included to provide thermal comfort inside vehicles,but they use a significant amount fuel,which ultimately have negative impacts on the *** this study,a prototype bus model was developed from an actual bus and scaled-down to 1/20th size.A bulb was used as an internal heat source and experiments were conducted under the sun in summer to reflect scenarios of buses stuck in *** cases were considered by opening and closing the windows and doors and placing the PCM layer on the roof and covering the *** results demonstrate that when the PCM is used to cover the bulb and roof,the interior temperature can drop to the ambient temperature and remain there for a longer period of *** fact,keeping the windows and doors open results in a significantly lower indoor temperature than when they are *** results show that the heat from the engine makes a major contribution to raising the temperature inside of the *** results from the opened cases can be applied to various forms of public transportation worldwide,but for many closed vehicles,additional ducting systems integrated with PCM may be the best option.

关键词： Sodium sulfate decahydrate Phase change material Thermal energy storage Transportation

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An in vivo study of the pharmacological activities of a methanolic acetate fraction of Pistia stratiotes L.: An ethno-medicinal plant used in Bangladesh

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Animal Models and Experimental Medicine 2018年第3期1卷 221-227页

作者： md.Saddam Hussain md.Ibrahim md.Murad hasan Mohammad Tarek Aziz Suzia Akter Suchi md.Giash Uddin Department of Pharmacy Noakhali Science and Technology University Department of Pharmacy Atish Dipankar University of Science and Technology Department of microbiology Noakhali Science and Technology University

Background: The present study covered an assessment of methanolic acetate fractions of Pistia stratiotes, commonly known as water lettuce, for analgesic, anti-inflammatory, and CNS depressant ***: The methanol acetate fractions were extracted from Pistia stratiotes and administered to the experimental animals as 200 and 400 mg/kg doses to determine the effect on acetic acid-induced writhing and formalin-induced licking and biting,for the assessment of analgesic activity. The anti-inflammatory assay was done using the carrageenan-induced hind paw edema method, while assessment of CNS depressant activity was done using the open field and hole cross tests. The effects were compared to standard reference ***: At both doses(200 and 400 mg/kg body weight), the methanolic acetate extract of P. stratiotes showed significant analgesic action(P < 0.05) against acetic acid-induced writhing. The extract was also found to give significant protection against licking and biting at both doses. The methanolic acetate extract of P. stratiotes showed a significant(P < 0.05) anti-inflammatory effect from 0 minutes up to 3 hours in the carrageenan-induced paw edema test. In the CNS depressant assay,the methanolic acetate extract showed significant(P < 0.05) depressant activity at both doses from 30 to 120 minutes in both the hole cross and open field ***: Thus we can conclude that P. stratiotes extracts have significant analgesic, anti-inflammatory, and CNS depressant activity, compared to standard compounds, in an animal model.

关键词： acetic acid analgesic anti-inflammatory CNS-depressant formalin P.stratiotes

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Nitrogen-doped graphene quantum dots: Optical properties modification and photovoltaic applications

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Nano Research 2019年第5期12卷 1041-1047页

作者： md Tanvir hasan Roberto Gonzalez-Rodriguez Conor Ryan Kristof Pota Kayla Green Jeffery L.Coffer Anton V.Naumov Department of Physics and Astronomy Texas Christian UniversityTCU Box 298840Fort WorthTexas 76129USA Department cf Chemistry and Eiochemistry Texas Christian UniversityTCU Box 298860Fort WorthTexas 76129USA

In this work,we utilize a bottom-up approach to synthesize nitrogen self-doped graphene quantum dots (NGQDs) from a single glucosamine precursor via an eco-friendly microwave-assisted hydrothermal *** and optical properties of as-produced NGQDs are further modified using controlled ozone ***-treated NGQDs (Oz-NGQDs) are reduced in size to 5.5 nm with clear changes in the lattice structure and/D//G Raman ratios due to the introduction/alteration of oxygen-containing functional groups detected by Fourier-transform infrared (FTIR) spectrometer and further verified by energy dispersive X-ray spectroscopy (EDX) showing increased atomic/weight percentage of oxygen *** with structural modifications,GQDs experience decrease in ultraviolet-visible (UV-vis) absorption coupled with progressive enhancement of visible (up to 16 min treatment) and near-infrared (NIR)(up to 45 min treatment) *** allows fine-tuning optical properties of NGQDs for solar cell applications yielding controlled emission increase,while controlled emission quenching was achieved by either blue laser or thermal *** Oz-NGQDs were further used to form a photoactive layer of solar calls with a maximum efficiency of 2.64% providing a 6-fold enhancement over untreated NGQD devices and a 3-fold increase in fill factor/current *** study suggests simple routes to alter and optimize optical properties of scalably produced NGQDs to boost the photovoltaic performance of solar cells.

关键词： nitrogen-doped graphene quantum dots ozone treatment optical properties photovoltaics solar cells

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Bishop Koop conversion of temporary stoma can be an option to establish gut continuity early when primary anastomosis is not safe

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World Journal of Pediatric Surgery 2019年第2期2卷 16-19页

作者： md Samiul hasan Ashrarur Rahman Umama Huq Kazi Nur Ul Ferdous md Ayub Ali Pediatric Surgery Bangladesh Institute of Child Health(BICH)Dhaka Shishu(Children)HospitalDhakaBangladesh

background Intestinal perforation and sometimes obstruction in neonates demand diverting stomas which are associated with fluid,electrolytes and nutrient *** establishment of gut continuity is the key to the best outcome,though primary anastomosis is not always *** aim of this study was to evaluate the effectiveness of Bishop Koop stoma in establishing early continuity of gut and confirming the function of distal *** Data of patients who underwent Bishop Koop conversion of diverting stoma from July 2016 to June 2018 were reviewed *** and outcome data were recorded and analyzed using Statistical Package for the Social Science(SPSS)V.22 *** permission was taken from hospital ethical *** 29 patients were included(16 male and 13 female).Mean age of conversion was 5.8±2.5 months and mean weight was 4.9±*** bowel movement was established in 26 *** patient died of sepsis on sixth postoperative day and one had anastomotic *** was no significant difference with respect to outcome between perforation and obstruction *** Koop stomas were closed after 6 weeks of *** Bishop Koop conversion of temporary stoma was turned out as a good choice for these patients.

关键词： Bishop continuity establishing

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Graphene-Coated Optical Fiber SPR Biosensor for BRCA1 and BRCA2 Breast Cancer Biomarker Detection:a Numerical Design-Based Analysis

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Photonic Sensors 2020年第1期10卷 67-79页

作者： md.Biplob HOSSAIN md.Muztahidul ISLAM Lway Faisal ABDULRAZAK md.Masud RANA Tarik Bin Abdul AKIB mehedi HASSAN Dept.of Electrical and Electronic Engineering Jashore University of Science and TechnologyJashore-7408Bangladesh Dept.of Electrical and Electronic Engineering Bangladesh Army University of Engineering and TechnologyNatore-6431Bangladesh Dept.of Computer Science Cihan University SlemaniSulaimaniya-46001Iraq Dept.of Electrical and Electronic Engineering Rajshahi University of Engineering&TechnologyRajshahi-6402Bangladesh

This paper provides a simple hybrid design and numerical analysis of the graphene-coated fiber-optic surface plasmon resonance(SPR)biosensor for breast cancer gene-1 early onset(BRCA1)and breast cancer gene-2 early onset(BRCA2)genetic breast cancer *** specific mutations named 916delTT and 6174delT in the BRCA1 and BRCA2 are selected for numerical detection of breast *** sensor is based on the technique of the attenuated total reflection(ATR)method to detect deoxyribonucleic acid(DNA)hybridization along with individual point mutations in BRCA1 and BRCA2 *** have numerically shown that momentous changes present in the SPR angle(minimum:135%more)and surface resonance frequency(SRF)(minimum:136%more)for probe DNA with various concentrations of target DNA corresponding to a mutation of the BRCA1 and BRCA2 *** variation of the SPR angle and SRF for mismatched DNA strands is quite negligible,whereas that for complementary DNA strands is considerable,which is essential for proper detection of genetic biomarkers(916delTT and 6174delT)for early breast *** last,the effect of electric field distribution in inserting graphene layer is analyzed incorporating the finite difference time domain(FDTD)technique by using Lumerical FDTD solution commercial *** the best of our knowledge,this is the first demonstration of such a highly efficient biosensor for detecting BRCA1 and BRCA2 breast ***,the proposed biosensor opens a new window toward the detection of breast cancers.

关键词： ATR BRCA1 BRCA2 cancer DNA hybridization graphene,SPR SRF 6174delT 916delTT

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