We investigated the efficacy of green tea extract on Staphylococcus aureus and Klebsiella pneumon... more We investigated the efficacy of green tea extract on Staphylococcus aureus and Klebsiella pneumonia of raw chicken meat. The experiment was conducted using complete randomized design (CRD) having six (6) treatments with three (3) replications. The germicidal activity was determined using the drop plate method. The results indicated that the addition of green tea extract (GTE) decreased microbial population in raw chicken meat. The lowest colony forming unit/ml (CFU ml-1) was found in T5 in 10-3 dilution factor (DF). There was a highly significant difference (p<0.001) in CFU ml-1of Staphylococcus aureus and Klebsiella pneumonia among different treatments i.e., GTE has significant effect (p<0.001) on Klebsiella pneumoniae and Staphylococcus aureus. The maximum number of Staphylococcus aureus in raw chicken meat was 14×105 CFU ml-1in T0 using TVC, while minimum was 4×104 CFU ml-1 in T5. Similar trend was also found in Klebsiella pneumoniae. GTE also showed highly significant (p&l...
Decomposed organic materials, in combination with plant growth-promoting bacteria (PGPB), are env... more Decomposed organic materials, in combination with plant growth-promoting bacteria (PGPB), are environmentally friendly and reduce synthetic fertilizer use in rice production. A bio-organic fertilizer (BoF) was prepared using kitchen waste (79%), chita-dhan (unfilled rice grain) biochar (15%), rock phosphate (5%), and a consortium of 10 PGPB (1%) to supplement 30% nitrogen and to replace triple superphosphate (TSP) fertilizer in rice production with an improvement of soil health. PGPB were local isolates and identified using 16S ribosomal RNA partial gene sequences as Bacillus mycoides, Proteus sp., Bacillus cereus, Bacillus subtilis, Bacillus pumilus, Paenibacillus polymyxa, and Paenibacillus spp. Isolates could fix N2 by 0.7–1.4 g kg–1, solubilize 0.1–1.2 g kg–1 phosphate, and produce 0.1–40 g kg–1 indoleacetic acid. The performance of BoF was evaluated by 16 field experiments and 18 farmers’ field demonstration trials during the year 2017–2020 in different parts of Bangladesh. Per...
Since the first recorded case of SARS-CoV-2 in Bangladesh on 8th March 2020, COVID-19 has spread ... more Since the first recorded case of SARS-CoV-2 in Bangladesh on 8th March 2020, COVID-19 has spread widely through different regions of the country, resulting in a necessity to re-evaluate the delivery of cardiovascular services, particularly procedures pertaining to interventional cardiology in resource-limited settings. Given its robust capacity for human-to-human transmission and potential of being a nosocomial source of infection, the disease has specific implications on healthcare systems and health care professionals faced with performing essential cardiac procedures in patients with a suspected or confirmed diagnosis of COVID-19. The limited resources in terms of cardiac catheterization laboratories that can be designated to treat only COVID positive patients are further compounded by the additional challenges of unavailability of widespread rapid testing on-site at tertiary cardiac hospitals in Bangladesh. This document prepared for our nation by the Bangladesh Society of Cardi...
Journal of Pharmaceutical Research International, 2021
Background: Screening of plant kingdom for various pharmacologic activities with an aim of discov... more Background: Screening of plant kingdom for various pharmacologic activities with an aim of discovering new active constituents is a continuous process and a part of systemic analysis. Purpose: The purpose of this study was to investigate hypoglycemic, hypolipidemic, anti-ulcer, and thrombolytic effects of the ethanolic extract of Grewia hirsuta Vahl. (EEGH) in different in vivo and in vitro paradigms in both Swiss Albino mice and Long Evans rats. Materials and Methods: After an oral acute toxicity study, adult male mice and rats according to the testing procedure were treated with EEGH (200, 400, 2000 and 4000 mg/kg, p.o.) and (1000 mg/70kg B.W. p.o Metformin, 10 mg/70kg, B.W. p.o Simvastatin, and 30 mg/70kg, B.W. p.o Omeprazole), and subjected to three in vivo tests and one in vitro test according to various established testing protocol. Results: After testing glucose tolerance test, for hypoglycemic activities, 400 mg/kg EEGH both in 6 weeks and 12 weeks exhibited moderate anti-di...
Tin perovskites have emerged as promising alternatives to toxic lead perovskites in next-generati... more Tin perovskites have emerged as promising alternatives to toxic lead perovskites in next-generation photovoltaics, but their poor environmental stability remains an obstacle towards more competitive performances. Therefore, a full understanding of their decomposition processes is needed to address these stability issues. Herein, we elucidate the degradation mechanism of 2D/3D tin perovskite films based on (PEA)0.2(FA)0.8SnI3(where PEA is phenylethylammonium and FA is formamidinium). We show that SnI4, a product of the oxygen-induced degradation of tin perovskite, quickly evolves into iodine via the combined action of moisture and oxygen. We identify iodine as a highly aggressive species that can further oxidise the perovskite to more SnI4, establishing a cyclic degradation mechanism. Perovskite stability is then observed to strongly depend on the hole transport layer chosen as the substrate, which is exploited to tackle film degradation. These key insights will enable the future des...
Proceedings of the National Academy of Sciences, 2020
Significance Nipah virus (NiV) is a zoonotic virus and World Health Organization (WHO) priority p... more Significance Nipah virus (NiV) is a zoonotic virus and World Health Organization (WHO) priority pathogen that causes near-annual outbreaks in Bangladesh and India with >75% mortality. This work advances our understanding of transmission of NiV in its natural bat reservoir by analyzing data from a 6-y multidisciplinary study of serology, viral phylogenetics, bat ecology, and immunology. We show that outbreaks in Pteropus bats are driven by increased population density, loss of immunity over time, and viral recrudescence, resulting in multiyear interepizootic periods. Incidence is low, but bats carry NiV across Bangladesh and can shed virus at any time of year, highlighting the importance of routes of transmission to the timing and location of human NiV outbreaks.
Perovskite solar cells containing a mixture of A-site cations show increased activation energies ... more Perovskite solar cells containing a mixture of A-site cations show increased activation energies for iodide diffusion.
Maize (Zea mays L.) is an important food and feed crop in Bangladesh as well as in the world. But... more Maize (Zea mays L.) is an important food and feed crop in Bangladesh as well as in the world. But its cultivation is limited in the soils of Sylhet, Bangladesh. To study the physiological growth indices of maize genotypes an experiment was carried out at the experimental field of Sylhet Agricultural University (SAU), Bangladesh during December 2014 to May 2015. The maize genotypes as the experimental materials were ZM 0001, ZM 0002, ZM 0003, ZM 0004, ZM 0005, ZM 0006 ZM 0007 and BARI Maize 6. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. Seeds were sown on 26 December 2014. Proper cultural management practices were followed as and when necessary during the growing period of the crop. Data were recorded on dry matter partitioning, different growth rate parameters and dry matter production of different plant parts at 30 days interval. The results indicated significant variations in almost all of the growth indices. Dry matter accumul...
In March 2011, a multidisciplinary team investigated 2 human cases of highly pathogenic avian inf... more In March 2011, a multidisciplinary team investigated 2 human cases of highly pathogenic avian influenza A(H5N1) virus infection, detected through population-based active surveillance for influenza in Bangladesh, to assess transmission and contain further spread. We collected clinical and exposure history of the case patients and monitored persons coming within 1 m of a case patient during their infectious period. Nasopharyngeal wash specimens from case patients and contacts were tested with real-time reverse-transcription polymerase chain reaction, and virus culture and isolates were characterized. Serum samples were tested with microneutralization and hemagglutination inhibition assays. We tested poultry, wild bird, and environmental samples from case patient households and surrounding areas for influenza viruses. Two previously healthy case patients, aged 13 and 31 months, had influenzalike illness and fully recovered. They had contact with poultry 7 and 10 days before illness ons...
A novel cobalt orthosilicate, Na2CoSiO4, shows promise as a high voltage (3.3 V vs. Na/Na+) catho... more A novel cobalt orthosilicate, Na2CoSiO4, shows promise as a high voltage (3.3 V vs. Na/Na+) cathode material for sodium-ion batteries.
Soft storey buildings are characterized by having a storey which has a lot of open spaces. This s... more Soft storey buildings are characterized by having a storey which has a lot of open spaces. This soft storey creates a major weak point in an earthquake. Since soft stories are classically associated with retail spaces and parking garages, they are often on the lower stories of a building, which means that when they collapse, they can take the whole building down with them, causing serious structural damage which may render the structure totally unusable. In this study, efforts have been given to examine the effect of incorporation of isolator on the seismic behavior of buildings subjected to the appropriate earthquake for medium risk seismicity region. It duly ensures incorporating isolator with all relevant properties as per respective isolators along with its time period and damping ratio. Effort has also been made here to build up a relationship for increasing storey height and the changes for incorporating isolator with same time period and damping ratio for both lead rubber bea...
We investigated the efficacy of green tea extract on Staphylococcus aureus and Klebsiella pneumon... more We investigated the efficacy of green tea extract on Staphylococcus aureus and Klebsiella pneumonia of raw chicken meat. The experiment was conducted using complete randomized design (CRD) having six (6) treatments with three (3) replications. The germicidal activity was determined using the drop plate method. The results indicated that the addition of green tea extract (GTE) decreased microbial population in raw chicken meat. The lowest colony forming unit/ml (CFU ml-1) was found in T5 in 10-3 dilution factor (DF). There was a highly significant difference (p<0.001) in CFU ml-1of Staphylococcus aureus and Klebsiella pneumonia among different treatments i.e., GTE has significant effect (p<0.001) on Klebsiella pneumoniae and Staphylococcus aureus. The maximum number of Staphylococcus aureus in raw chicken meat was 14×105 CFU ml-1in T0 using TVC, while minimum was 4×104 CFU ml-1 in T5. Similar trend was also found in Klebsiella pneumoniae. GTE also showed highly significant (p&l...
Decomposed organic materials, in combination with plant growth-promoting bacteria (PGPB), are env... more Decomposed organic materials, in combination with plant growth-promoting bacteria (PGPB), are environmentally friendly and reduce synthetic fertilizer use in rice production. A bio-organic fertilizer (BoF) was prepared using kitchen waste (79%), chita-dhan (unfilled rice grain) biochar (15%), rock phosphate (5%), and a consortium of 10 PGPB (1%) to supplement 30% nitrogen and to replace triple superphosphate (TSP) fertilizer in rice production with an improvement of soil health. PGPB were local isolates and identified using 16S ribosomal RNA partial gene sequences as Bacillus mycoides, Proteus sp., Bacillus cereus, Bacillus subtilis, Bacillus pumilus, Paenibacillus polymyxa, and Paenibacillus spp. Isolates could fix N2 by 0.7–1.4 g kg–1, solubilize 0.1–1.2 g kg–1 phosphate, and produce 0.1–40 g kg–1 indoleacetic acid. The performance of BoF was evaluated by 16 field experiments and 18 farmers’ field demonstration trials during the year 2017–2020 in different parts of Bangladesh. Per...
Since the first recorded case of SARS-CoV-2 in Bangladesh on 8th March 2020, COVID-19 has spread ... more Since the first recorded case of SARS-CoV-2 in Bangladesh on 8th March 2020, COVID-19 has spread widely through different regions of the country, resulting in a necessity to re-evaluate the delivery of cardiovascular services, particularly procedures pertaining to interventional cardiology in resource-limited settings. Given its robust capacity for human-to-human transmission and potential of being a nosocomial source of infection, the disease has specific implications on healthcare systems and health care professionals faced with performing essential cardiac procedures in patients with a suspected or confirmed diagnosis of COVID-19. The limited resources in terms of cardiac catheterization laboratories that can be designated to treat only COVID positive patients are further compounded by the additional challenges of unavailability of widespread rapid testing on-site at tertiary cardiac hospitals in Bangladesh. This document prepared for our nation by the Bangladesh Society of Cardi...
Journal of Pharmaceutical Research International, 2021
Background: Screening of plant kingdom for various pharmacologic activities with an aim of discov... more Background: Screening of plant kingdom for various pharmacologic activities with an aim of discovering new active constituents is a continuous process and a part of systemic analysis. Purpose: The purpose of this study was to investigate hypoglycemic, hypolipidemic, anti-ulcer, and thrombolytic effects of the ethanolic extract of Grewia hirsuta Vahl. (EEGH) in different in vivo and in vitro paradigms in both Swiss Albino mice and Long Evans rats. Materials and Methods: After an oral acute toxicity study, adult male mice and rats according to the testing procedure were treated with EEGH (200, 400, 2000 and 4000 mg/kg, p.o.) and (1000 mg/70kg B.W. p.o Metformin, 10 mg/70kg, B.W. p.o Simvastatin, and 30 mg/70kg, B.W. p.o Omeprazole), and subjected to three in vivo tests and one in vitro test according to various established testing protocol. Results: After testing glucose tolerance test, for hypoglycemic activities, 400 mg/kg EEGH both in 6 weeks and 12 weeks exhibited moderate anti-di...
Tin perovskites have emerged as promising alternatives to toxic lead perovskites in next-generati... more Tin perovskites have emerged as promising alternatives to toxic lead perovskites in next-generation photovoltaics, but their poor environmental stability remains an obstacle towards more competitive performances. Therefore, a full understanding of their decomposition processes is needed to address these stability issues. Herein, we elucidate the degradation mechanism of 2D/3D tin perovskite films based on (PEA)0.2(FA)0.8SnI3(where PEA is phenylethylammonium and FA is formamidinium). We show that SnI4, a product of the oxygen-induced degradation of tin perovskite, quickly evolves into iodine via the combined action of moisture and oxygen. We identify iodine as a highly aggressive species that can further oxidise the perovskite to more SnI4, establishing a cyclic degradation mechanism. Perovskite stability is then observed to strongly depend on the hole transport layer chosen as the substrate, which is exploited to tackle film degradation. These key insights will enable the future des...
Proceedings of the National Academy of Sciences, 2020
Significance Nipah virus (NiV) is a zoonotic virus and World Health Organization (WHO) priority p... more Significance Nipah virus (NiV) is a zoonotic virus and World Health Organization (WHO) priority pathogen that causes near-annual outbreaks in Bangladesh and India with >75% mortality. This work advances our understanding of transmission of NiV in its natural bat reservoir by analyzing data from a 6-y multidisciplinary study of serology, viral phylogenetics, bat ecology, and immunology. We show that outbreaks in Pteropus bats are driven by increased population density, loss of immunity over time, and viral recrudescence, resulting in multiyear interepizootic periods. Incidence is low, but bats carry NiV across Bangladesh and can shed virus at any time of year, highlighting the importance of routes of transmission to the timing and location of human NiV outbreaks.
Perovskite solar cells containing a mixture of A-site cations show increased activation energies ... more Perovskite solar cells containing a mixture of A-site cations show increased activation energies for iodide diffusion.
Maize (Zea mays L.) is an important food and feed crop in Bangladesh as well as in the world. But... more Maize (Zea mays L.) is an important food and feed crop in Bangladesh as well as in the world. But its cultivation is limited in the soils of Sylhet, Bangladesh. To study the physiological growth indices of maize genotypes an experiment was carried out at the experimental field of Sylhet Agricultural University (SAU), Bangladesh during December 2014 to May 2015. The maize genotypes as the experimental materials were ZM 0001, ZM 0002, ZM 0003, ZM 0004, ZM 0005, ZM 0006 ZM 0007 and BARI Maize 6. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. Seeds were sown on 26 December 2014. Proper cultural management practices were followed as and when necessary during the growing period of the crop. Data were recorded on dry matter partitioning, different growth rate parameters and dry matter production of different plant parts at 30 days interval. The results indicated significant variations in almost all of the growth indices. Dry matter accumul...
In March 2011, a multidisciplinary team investigated 2 human cases of highly pathogenic avian inf... more In March 2011, a multidisciplinary team investigated 2 human cases of highly pathogenic avian influenza A(H5N1) virus infection, detected through population-based active surveillance for influenza in Bangladesh, to assess transmission and contain further spread. We collected clinical and exposure history of the case patients and monitored persons coming within 1 m of a case patient during their infectious period. Nasopharyngeal wash specimens from case patients and contacts were tested with real-time reverse-transcription polymerase chain reaction, and virus culture and isolates were characterized. Serum samples were tested with microneutralization and hemagglutination inhibition assays. We tested poultry, wild bird, and environmental samples from case patient households and surrounding areas for influenza viruses. Two previously healthy case patients, aged 13 and 31 months, had influenzalike illness and fully recovered. They had contact with poultry 7 and 10 days before illness ons...
A novel cobalt orthosilicate, Na2CoSiO4, shows promise as a high voltage (3.3 V vs. Na/Na+) catho... more A novel cobalt orthosilicate, Na2CoSiO4, shows promise as a high voltage (3.3 V vs. Na/Na+) cathode material for sodium-ion batteries.
Soft storey buildings are characterized by having a storey which has a lot of open spaces. This s... more Soft storey buildings are characterized by having a storey which has a lot of open spaces. This soft storey creates a major weak point in an earthquake. Since soft stories are classically associated with retail spaces and parking garages, they are often on the lower stories of a building, which means that when they collapse, they can take the whole building down with them, causing serious structural damage which may render the structure totally unusable. In this study, efforts have been given to examine the effect of incorporation of isolator on the seismic behavior of buildings subjected to the appropriate earthquake for medium risk seismicity region. It duly ensures incorporating isolator with all relevant properties as per respective isolators along with its time period and damping ratio. Effort has also been made here to build up a relationship for increasing storey height and the changes for incorporating isolator with same time period and damping ratio for both lead rubber bea...
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