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Andrew M Baker - One of the best experts on this subject based on the ideXlab platform.
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life history breeding biology and movement in a new species of carnivorous marsupial the buff footed antechinus antechinus mysticus and a sympatric congener the subtropical antechinus antechinus subtropicus
Mammal Research, 2017Co-Authors: Thomas Y Mutton, Emma Gray, Susan Fuller, Andrew M BakerAbstract:Antechinus are one of just a few mammal genera worldwide which exhibit semelparous reproduction. Consequently, the life history of many antechinus has been well studied. However, in the last few years, several new species have been described in the genus and their ecology is little known. Here, the first multi-year ecological study of breeding, growth and movement in one of these species, the buff-footed antechinus, Antechinus mysticus, was undertaken. Over a 2-year period, monthly capture-mark-recapture data from two geographically close sites (~2.5 km apart) in south-east Queensland, Australia, were collected. At one site, the subtropical antechinus, Antechinus subtropicus, also occurred. This allowed the investigation of possible competitive effects between this larger Antechinus species and A. mysticus. Intensive trapping across the breeding season of A. mysticus also allowed the growth rates of pouch young of a wild antechinus population to be calculated for the first time. Results showed that A. mysticus followed the synchronous, semelparous breeding strategy seen in all congeners. Male A. mysticus were last caught in August, and females gave birth in September. Average distance moved by A. mysticus was comparable with congeners. Competition with A. subtropicus may affect A. mysticus because A. mysticus weighed more and males moved further when not in sympatry with A. subtropicus. However, female A. mysticus moved further when in sympatry with A. subtropicus, confounding clear interpretation. Overall, the life history information obtained for A. mysticus provides a foundation for further research and will aid the conservation management of this new species.
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a new dasyurid marsupial from eastern queensland australia the buff footed antechinus antechinus mysticus sp nov marsupialia dasyuridae
Science & Engineering Faculty, 2012Co-Authors: Andrew M Baker, Thomas Y Mutton, Steve Van DyckAbstract:Antechinus mysticus sp. nov. occurs in coastal Australia, ranging from just north of the Queensland (Qld)/New South Wales (NSW) border to Mackay (mid-east Qld), and is sympatric with A. flavipes (Waterhouse) and A. subtropicus Van Dyck & Crowther in south-east Qld. The new species can be distinguished in the field, having paler feet and tail base than A. flavipes and a greyish head that merges to buff-yellow on the rump and flanks, compared with the more uniform brown head and body of A. subtropicus and A. stuartii Macleay. Features of the dentary can also be used for identification: A. mysticus differs from A. flavipes in having smaller molar teeth, from A. subtropicus in having a larger gap between front and rear palatal vacuities, and from A. stuartii in having a generally broader snout. Here, we present a morphological analysis of the new species in comparison with every member of the genus, including a discussion of genetic structure and broader evolutionary trends, as well as an identification key to species based on dental characters. It seems likely that the known geographic range of A. mysticus will expand as taxonomic focus on the genus is concentrated in south-east Queensland and north-east New South Wales.
Shiming Deng - One of the best experts on this subject based on the ideXlab platform.
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a study on the thermal comfort in sleeping environments in the Subtropics measuring the total insulation values for the bedding systems commonly used in the Subtropics
Building and Environment, 2008Co-Authors: Zhongping Lin, Shiming DengAbstract:Abstract The total thermal insulation value of a bedding system significantly affects the thermal neutral temperature for sleeping environments and is therefore an important variable in the Comfort Equation developed for sleeping environments reported in a related paper. This paper reports on the measurement of the total insulation values for a wide range of bedding systems (through different combinations of bed, bedding and its percentage coverage over a human body, and sleepwear) commonly used in the subtropical regions using a thermal manikin. The total insulation values of the measured bedding systems varied greatly from 0.90 to 4.89 clo, depending upon bedding, bed and mattress, the type of sleepwear, and percentage coverage of body surface area by bedding and bed. The use of a Chinese traditional style bed—Zongbang bed can provide less insulation than the use of the conventional mattress commonly used in Hong Kong. The use of so-called air conditioning quilt (summer quilt) cannot help lower the total insulation significantly. On the other hand, some factors such as people sweating and moisture permeability of the quilts, etc., were not considered in the current study but may be further studied in future work.
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a study on the thermal comfort in sleeping environments in the Subtropics developing a thermal comfort model for sleeping environments
Building and Environment, 2008Co-Authors: Shiming DengAbstract:In the Subtropics, air conditioning serves to maintain an appropriate indoor thermal environment not only in workplaces during daytime, but also at night for sleeping in bedrooms in residences or guestrooms in hotels. However, current practices in air conditioning, as well as the thermal comfort theories on which these practices are based, are primarily concerned with situations in which people are awake in workplaces at daytime. Therefore, these may not be directly applicable to air conditioning for sleeping environments. This paper, reports on a theoretical study on a thermal comfort model in sleeping environments. A comfort equation applicable to sleeping thermal environments was derived by introducing appropriate modifications to Fanger's comfort model. Comfort charts which were established by solving the comfort equation, and can be used for determining thermally neutral environmental conditions under a given bedding system have been developed. A related paper reports on an experimental study on measuring the total thermal insulation values of a wide range of bedding systems commonly used in the Subtropics, which are an essential input to the comfort equation developed and reported in this paper.
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The characteristics of space cooling load and indoor humidity control for residences in the Subtropics
Building and Environment, 2006Co-Authors: Zheng Li, Wu Yi-chen, Shiming DengAbstract:For residential buildings located in the Subtropics, it is more challenging and difficult to deal with space latent cooling load than space sensible load, using a room air conditioner (RAC), partly due to hot and humid climates. This paper reports a simulation study on the characteristics of space cooling load and indoor humidity control for residences in the Subtropics, using a building energy simulation program. Both the weather conditions and the typical arrangements of high-rise residential blocks in subtropical Hong Kong were used in the simulation study. The simulation results on both the space cooling load characteristics and the hourly application sensible heat ratio (SHR) in the living/dining room and the master bedroom in a selected west-facing apartment under different operating modes of RACs in the summer design day are presented. The problem of indoor humidity control due to the mismatching between an application SHR and an equipment SHR in the two rooms both in the summer design day and during part load operations and the influences of indoor furnishings acting as moisture capacitors on indoor RH level are discussed.
Thomas Y Mutton - One of the best experts on this subject based on the ideXlab platform.
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life history breeding biology and movement in a new species of carnivorous marsupial the buff footed antechinus antechinus mysticus and a sympatric congener the subtropical antechinus antechinus subtropicus
Mammal Research, 2017Co-Authors: Thomas Y Mutton, Emma Gray, Susan Fuller, Andrew M BakerAbstract:Antechinus are one of just a few mammal genera worldwide which exhibit semelparous reproduction. Consequently, the life history of many antechinus has been well studied. However, in the last few years, several new species have been described in the genus and their ecology is little known. Here, the first multi-year ecological study of breeding, growth and movement in one of these species, the buff-footed antechinus, Antechinus mysticus, was undertaken. Over a 2-year period, monthly capture-mark-recapture data from two geographically close sites (~2.5 km apart) in south-east Queensland, Australia, were collected. At one site, the subtropical antechinus, Antechinus subtropicus, also occurred. This allowed the investigation of possible competitive effects between this larger Antechinus species and A. mysticus. Intensive trapping across the breeding season of A. mysticus also allowed the growth rates of pouch young of a wild antechinus population to be calculated for the first time. Results showed that A. mysticus followed the synchronous, semelparous breeding strategy seen in all congeners. Male A. mysticus were last caught in August, and females gave birth in September. Average distance moved by A. mysticus was comparable with congeners. Competition with A. subtropicus may affect A. mysticus because A. mysticus weighed more and males moved further when not in sympatry with A. subtropicus. However, female A. mysticus moved further when in sympatry with A. subtropicus, confounding clear interpretation. Overall, the life history information obtained for A. mysticus provides a foundation for further research and will aid the conservation management of this new species.
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a new dasyurid marsupial from eastern queensland australia the buff footed antechinus antechinus mysticus sp nov marsupialia dasyuridae
Science & Engineering Faculty, 2012Co-Authors: Andrew M Baker, Thomas Y Mutton, Steve Van DyckAbstract:Antechinus mysticus sp. nov. occurs in coastal Australia, ranging from just north of the Queensland (Qld)/New South Wales (NSW) border to Mackay (mid-east Qld), and is sympatric with A. flavipes (Waterhouse) and A. subtropicus Van Dyck & Crowther in south-east Qld. The new species can be distinguished in the field, having paler feet and tail base than A. flavipes and a greyish head that merges to buff-yellow on the rump and flanks, compared with the more uniform brown head and body of A. subtropicus and A. stuartii Macleay. Features of the dentary can also be used for identification: A. mysticus differs from A. flavipes in having smaller molar teeth, from A. subtropicus in having a larger gap between front and rear palatal vacuities, and from A. stuartii in having a generally broader snout. Here, we present a morphological analysis of the new species in comparison with every member of the genus, including a discussion of genetic structure and broader evolutionary trends, as well as an identification key to species based on dental characters. It seems likely that the known geographic range of A. mysticus will expand as taxonomic focus on the genus is concentrated in south-east Queensland and north-east New South Wales.
Abdelhafidh Dhouib - One of the best experts on this subject based on the ideXlab platform.
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phycoremediation potential physiological and biochemical response of amphora subtropica and dunaliella sp to nickel pollution
Journal of Applied Phycology, 2018Co-Authors: Ines Dahmenben Moussa, Haifa Chtourou, Sami Sayadi, Khaled Athmouni, Habib Ayadi, Abdelhafidh DhouibAbstract:Metal pollution can produce many biological effects on aquatic environments. The marine diatom Amphora subtropica and the green alga Dunaliella sp. possess a high metal absorption capacity. Nickel (Ni) removal by living cells of A. subtropica and Dunaliella sp. was tested in cultures exposed to different Ni concentrations (100, 200, 300, and 500 mg L−1). The amount of Ni removed by the microalgae increased with the time of exposure and the initial Ni concentration in the medium. The metal, which was mainly removed by bioadsorption to Dunaliella sp. cell surfaces (93.63% of total Ni (for 500 mg Ni L−1) and by bioaccumulation (80.82% of total Ni (for 300 mg Ni L−1) into Amphora subtropica cells, also inhibited growth. Exposure to Ni drastically reduced the carbohydrate and protein concentrations and increased total lipids from 6.3 to 43.1 pg cell−1, phenolics 0.092 to 0.257 mg GAE g−1 (Fw), and carotenoid content, from 0.08 to 0.59 mg g−1 (Fw), in A. subtropica. In Dunaliella sp., total lipids increased from 26.1 to 65.3 pg cell−1, phenolics from 0.084 to 0.289 mg GAE g−1 (Fw), and carotenoid content from 0.41 to 0.97 mg g−1 (Fw). These compounds had an important role in protecting the algae against ROS generated by Ni. In order to cope with Ni stress shown by the increase of TBARS level, enzymatic (SOD, CAT, and GPx) ROS scavenging mechanisms were induced.
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salinity stress increases lipid secondary metabolites and enzyme activity in amphora subtropica and dunaliella sp for biodiesel production
Bioresource Technology, 2016Co-Authors: Ines Benmoussadahmen, Haifa Chtourou, Fatma Rezgui, Sami Sayadi, Abdelhafidh DhouibAbstract:Amphora subtropica and Dunaliella sp. isolated from Tunisian biotopes were retained for their high lipid contents. Respective optimized parameters for rapid growth were: pH 9 and 10, light period 21 and 24h and temperature 31 and 34°C, respectively. After optimization, Amphora subtropica growth rate increased from 0.2 to 0.5day(-1) and Dunaliella sp. growth rate increased from 0.38 to 0.7day(-1). Amphora subtropica biomass production, productivity and lipid content increased from 0.3 to 0.7gL(-1)(dw), 69-100mgL(-1)d(-1)(dw) and 150-190gkg(-1)(dw), respectively, and Dunaliella sp. from 0.5 to 1.4gL(-1)(dw), 124-200mgL(-1)d(-1) (dw) and 190-280gkg(-1)(dw), respectively. Often to overcome trade-off between microalgae rapid growth and high lipid content which are often conflicting and very difficult to obtain at the same time, separation in a growth stage and a lipid accumulation stage is obvious. Salinity stress in a single stage of culture was studied. Compared to the optimal concentration of growth, excess or deficiency of NaCl engendered the same cellular responses by implication of oxidative stress systems and reactivation of defense and storage systems. Indeed, increasing salinity from 1M to 2M for Amphora subtropica or decreasing salinity from 3M to 2M for Dunaliella sp. have both increased lipids content from (220 and 280) to (350 and 430)gkg(-1), carotenoids from (1.8 and 2.4) to (2.3 and 3.7)pgcell(-1), TBARS amount from (10.4 and 5.3) to (12.1 and 10.7)nmolmg(-1) proteins and SOD activity from of (46.6 and 61.8) to (71.6 and 79.4)Umg(-1) proteins, respectively. With further improved fatty acids profile, the microalgae strains could be potent candidates for biofuel production.
Susan Fuller - One of the best experts on this subject based on the ideXlab platform.
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life history breeding biology and movement in a new species of carnivorous marsupial the buff footed antechinus antechinus mysticus and a sympatric congener the subtropical antechinus antechinus subtropicus
Mammal Research, 2017Co-Authors: Thomas Y Mutton, Emma Gray, Susan Fuller, Andrew M BakerAbstract:Antechinus are one of just a few mammal genera worldwide which exhibit semelparous reproduction. Consequently, the life history of many antechinus has been well studied. However, in the last few years, several new species have been described in the genus and their ecology is little known. Here, the first multi-year ecological study of breeding, growth and movement in one of these species, the buff-footed antechinus, Antechinus mysticus, was undertaken. Over a 2-year period, monthly capture-mark-recapture data from two geographically close sites (~2.5 km apart) in south-east Queensland, Australia, were collected. At one site, the subtropical antechinus, Antechinus subtropicus, also occurred. This allowed the investigation of possible competitive effects between this larger Antechinus species and A. mysticus. Intensive trapping across the breeding season of A. mysticus also allowed the growth rates of pouch young of a wild antechinus population to be calculated for the first time. Results showed that A. mysticus followed the synchronous, semelparous breeding strategy seen in all congeners. Male A. mysticus were last caught in August, and females gave birth in September. Average distance moved by A. mysticus was comparable with congeners. Competition with A. subtropicus may affect A. mysticus because A. mysticus weighed more and males moved further when not in sympatry with A. subtropicus. However, female A. mysticus moved further when in sympatry with A. subtropicus, confounding clear interpretation. Overall, the life history information obtained for A. mysticus provides a foundation for further research and will aid the conservation management of this new species.
