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101.
Naz Aliya Chowdhury Abhiroop Mishra Brijesh Kumar Karthikeyan K. 《Environmental geochemistry and health》2018,40(5):2155-2175
Environmental Geochemistry and Health - This study accessed the levels of Cd, Cr, Fe, Mn, Ni, Pb and Zn concentration in soils of different locations (mine, roadside, agricultural and control... 相似文献
102.
S. M. Sharifuzzaman M. Shahadat Hossain Sayedur Rahman Chowdhury Subrata Sarker M. Shah Nawaz Chowdhury M. Zahedur Rahman Chowdhury 《Journal of Coastal Conservation》2018,22(6):1167-1176
Resilience has been conceptualized in various ways by anthropologists, ecologists, systems scientists and engineers; the boundaries of resilience are subjective and context dependent. Consequently, choosing the standards and metrics for assessing resilience remains key challenges for policy makers. In this study, using multicriteria evaluation of 40 basic criteria of human, physical, financial, natural and social assets, we have identified several elements, such as experienced fishermen, natural abundance of hilsa (Tenualosa ilisha), ability to assert decision on fish selling, nets and boats ownership, social harmony and capacity of buying food as essential livelihood assets for the fishermen at Hatiya Island, Bangladesh. These assets may enhance the relative resilience of the fishing community of the island to climate change by as much as 20–40%. The results of this study will improve our understanding of the elements that lead to resilience at the community level. 相似文献
103.
Pawel Kosinski Roy Nyheim Vijayshankar Asokan Trygve Skjold 《Journal of Loss Prevention in the Process Industries》2013,26(1):45-51
Explosions of hybrid mixtures, i.e. mixtures containing more than one combustible phase, are not well understood. Most studies in this area involve mixtures of common dusts and gases, such as coal and methane, or polyethylene and ethylene. The present work focuses on explosions of carbon black particles, i.e. almost pure carbon with a very low content of volatiles: this makes the process of explosion less intense. However, addition of some quantities of combustible gases (here: propane) may sustain combustion processes. Another important issue is the fact that the carbon black particles are smaller in size than most dusts encountered in the process industry. The experiments were carried out in a 20-L explosion vessel and the analysis of the results focuses on the maximum explosion pressures and the maximum rates of pressure rise as a function of carbon black and propane concentrations. In addition, some samples of unburnt dust were collected and analysed with a scanning electron microscope and with thermo-gravimetric analysis. 相似文献
104.
Becky L. Williams Vanessa Lovenburg Christine L. Huffard Roy L. Caldwell 《Chemoecology》2011,21(3):131-141
Some pelagic marine larvae possess anti-predator chemical defenses. Occasionally, toxic adults imbue their young with their
own defensive cocktails. We examined paralarvae of the greater blue-ringed octopus (Hapalochlaena lunulata) for the deadly neurotoxin tetrodotoxin (TTX), and if present, whether TTX conferred protection to individual paralarvae.
Paralarvae of H. lunulata possessed 150 ± 17 ng TTX each. These paralarvae appeared distasteful to a variety of fish and stomatopod predators, yet
food items spiked with 200 ng TTX were readily consumed by predators. We conclude that TTX alone does not confer individual
protection to paralarvae of H. lunulata, and that they possess an alternative defense. In larger doses, tetrodotoxin is a deterrent to the predatory stomatopod Haptosquilla trispinosa (mean dose = 3.97 μg/g). This corresponds to 12–13 paralarvae per predator based on the TTX levels of the clutch we examined.
Thus, the basic assumption that individual paralarvae of H. lunulata are defended by TTX alone was disproved. Instead, functionality of TTX levels in paralarvae may arise through alternative
selective pathways, such as deterrence to parasites, through kin selection, or against predator species not tested here. 相似文献
105.
Eleni Costa Christopher Thrasivoulou David L. Becker Jan A. Deprest Anna L. David Tina T. Chowdhury 《黑龙江环境通报》2023,43(10):1284-1295
Objective
The effects of mechanical stimulation in preterm amniotic membrane (AM) defects were explored.Methods
Preterm AM was collected from women undergoing planned preterm caesarean section (CS) due to fetal growth restriction or emergency CS after spontaneous preterm prelabour rupture of the membranes (sPPROM). AM explants near the cervix or placenta were subjected to trauma and/or mechanical stimulation with the Cx43 antisense. Markers for nuclear morphology (DAPI), myofibroblasts (αSMA), migration (Cx43), inflammation (PGE2) and repair (collagen, elastin and transforming growth factor β [TGFβ1]) were examined by confocal microscopy, second harmonic generation, qPCR and biochemical assays.Results
In preterm AM defects, myofibroblast nuclei were highly deformed and contractile and expressed αSMA and Cx43. Mechanical stimulation increased collagen fibre polarisation and the effects on matrix markers were dependent on tissue region, disease state, gestational age and the number of fetuses. PGE2 levels were broadly similar but reduced after co-treatment with Cx43 antisense in late sPPROM AM defects. TGFβ1 and Cx43 gene expression were significantly increased after trauma and mechanical stimulation but this response dependent on gestational age.Conclusion
Mechanical stimulation affects Cx43 signalling and cell/collagen mechanics in preterm AM defects. Establishing how Cx43 regulates mechanosignalling could be an approach to repair tissue integrity after trauma. 相似文献106.
Parveen Naseeba Chowdhury Shamik Goel Sudha 《Environmental science and pollution research international》2022,29(57):85742-85760
Environmental Science and Pollution Research - Chlorinated disinfectants are widely used in hospitals, COVID-19 quarantine facilities, households, institutes, and public areas to combat the spread... 相似文献
107.
Mubarak A. Khan S. Shehrzade M. Sarwar U. Chowdhury M. M. Rahman 《Journal of Polymers and the Environment》2001,9(3):115-124
Jute yarns were grafted with a single impregnating monomer 1,6-hexanediol diacrylate (HDDA) in order to improve the physicomechanical properties. Jute yarns soaked for different soaking times (3, 5, 10, and 30 minutes) in HDDA+MeOH solutions at different proportions (1–10% HDDA in MeOH [v/v] along with photoinitiator Darocur-1664 [3%]) were cured under UV lamp at different UV radiation intensities (two, four, six, and eight passes). Concentration of monomer, soaking time, and intensity of UV radiation were optimized with extent of mechanical properties such as tensile strength, elongation at break, and modulus. Enhanced tensile strength (67%), modulus (108%), and polymer loading (11%) were achieved with 5% HDDA concentration, 5-minute soaking time, fourth pass of UV radiation. To further improve the mechanical properties, the jute yarns were pretreated with UV radiation (5, 10, 15, 30, and 50 passes) and treated with optimized monomer concentration (5%). UV-pretreated samples showed the enhanced properties. The tensile strength and modulus increase up to 84% and 132%, respectively, than that of virgin jute yarn. An experiment involving water absorption capacity shows that water uptake by treated samples was much lower than that of the untreated samples. During the weathering test, treated yarns exhibited less loss of mechanical properties than untreated yarns. 相似文献
108.
Summary. Although terrestrial turtles have served as a model for studies of olfactory neurophysiology, little is known about how they
use chemical information in an ecological sense. We tested whether box turtles (Terrapene carolina) use chemical information to distinguish between predatory and nonpredatory mammals. Box turtles in our study exhibited more
escape behavior when exposed to urine from a predator (coyote, Canis latrans) than when exposed to urine from a nonpredator (white-tailed deer, Odocoileus virginianus) or a blank control. Escape behavior is consistent with an antipredator response. In addition, the turtles decreased their
handling time for food when in the presence of urine from either species of mammal in comparison to the blank, indicating
that chemical cues from mammals in general may result in increased vigilance by terrestrial turtles. Examination of a variety
of response variables may be important for adequate assessment of the ecological role of chemosensory behavior. 相似文献
109.
Grout formulations have been investigated in Nevada Nuclear Waste Storage Investigations Project, for possible nuclear waste repository sealing applications focused in the Yucca Mountain Area (in welded tuff). A shrinkage compensated cement was chemically modified with siliceous reactants to enhance the chemical compatibility with a siliceous tuff. Fluids in contact with the grouts were measured at 150 °C and 200 °C, and the solids were characterized. Well-crystallized Al-substituted tobermorite and truscottite were observed, and sometimes xonotlite as dominant cementitious phases. Comparisons of solid phases and solution phases are made with a second grout incorporating siliceous modifiers in a Class H cement. Exposures to 150 °C hydrothermal conditions have not produced significant detrimental mechanical behavior of the seal material. The thermal decomposition of ettringite, an expansive calcium sulfate aluminate hydrate, resulted in a small increase in the porosity of the grout, but on a very small fine scale. 相似文献
110.
Chakrabortty Rabin Pal Subodh Chandra Arabameri Alireza Ngo Phuong Thao Thi Chowdhuri Indrajit Roy Paramita Malik Sadhan Das Biswajit 《Environment, Development and Sustainability》2022,24(3):3558-3559
Environment, Development and Sustainability - 相似文献