Ecohydrology
·
2024
·
IF 2.5
Yuqing Lin,Ting Li,Qiuwen Chen,Ruxia Qiao,Shufeng He,Tao Feng,Jun Wang
The establishment of reservoirs, which alter water temperature and flow dynamics, significantly affects the indigenous fish population, yet the underlying molecular mechanisms remain unclear. To investigate effects of the changing water temperature and flow rate on fish ovaries, we subjected female Coreius guichenoti to the combination of different water temperatures (17°C, 20°C and 23°C denoted as L, N and H, respectively) and flow velocities (0 and 0.5 m/s denoted as S and V, respectively). After 30-day experiment period, we identified 393, 545, 300 and 657 differentially expressed transcripts in HV versus NV, LV versus NV, HS versus NV and LS versus NV, respectively. The transcriptome results showed that both environmental factors could significantly influence oogenesis, with water temperature exerting a more pronounced effect than flow velocity. In particular, the higher temperature (HV and HS) led to a tendency towards masculinization and even infertility in females, which were consistent with the histopathology results. By contrast, the lower temperature (LV and LS) promoted the progression of desirable female attributes, where static water conditions (LS) had a greater effect compared with flowing water (LV). These findings were of great significance for the adaptive operation of reservoirs to create reasonable and precise ecological flows for managing fish reproduction.
研究领域:
生态学
·
分子生物学
·
鱼类学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Kexin Li,Mingzhe Dong,Li Han,Mingzhen Li,Huifang Zhang,Xiushen Ye,Haining Liu,Siyuan Zhang,Quan Li,Honghui Liu,Guosheng Shi,Zhijian Wu
The electrolytic production of magnesium metal requires anhydrous MgCl 2 with a high-purity, which is usually prepared through the dehydration of MgCl 2 ·6H 2 O at a relatively high temperature. The Mg 2+ cations in MgCl 2 ·6H 2 O have a high affinity for water and the complete dehydration of MgCl 2 ·6H 2 O is difficult due to the hydrolysis of the hydrated Mg 2+ cations. The hydrolysis usually results in the formation of unwanted oxycompounds of magnesium. In this study, the effects of the addition of AlCl 3 and NH 4 Cl on the dehydration of MgCl 2 ·6H 2 O were investigated by comparing the thermal decomposition processes of MgCl 2 ·6H 2 O, MgCl 2 ·6H 2 O/AlCl 3 , and MgCl 2 ·6H 2 O/NH 4 Cl, using Raman, FT-IR, TG-DSC, XRD techniques and theoretical calculations. It was found that the addition of AlCl 3 or NH 4 Cl significantly reduces the dehydration energy barrier of MgCl 2 ⋅6H 2 O, decreases the dehydration temperature, and suppresses the hydrolysis of MgCl 2 ·6H 2 O. Anhydrous AlCl 3 can extract water from MgCl 2 ·6H 2 O at room temperature. The interactions between Al 3+ or NH 4 + and H 2 O, together with the substitution of Cl - for H 2 O, result in the easier production of anhydrous MgCl 2 . During the dehydration of MgCl 2 ·6H 2 O, several impurities including MgO are generated, indicating that the environment remains to be an important controlling factor for the dehydration of MgCl 2 ⋅6H 2 O. The results obtained would be helpful for understanding the dehydration processes and mechanisms of MgCl 2 ·6H 2 O under the assistance of AlCl 3 and NH 4 Cl, and for exploring new techniques for MgCl 2 ·6H 2 O dehydration.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2020
·
IF 5.647
Shuo Li,Jia Liu,Tianwei Tan,Jiapei Nie,Huili Zhang
To reduce the emission of greenhouse gases, the substitution of fossil fuel by renewable energy sources is increasingly important. Matching energy supply and demand is however required, even more so if intermittent renewable energy sources are employed. Thermal energy storage then offers significant advantages. Thermo-chemical energy storage systems, using reversible reactions, have a high reaction enthalpy that exceeds the storage capacities of sensible and latent heat modes. Magnesium hydroxide is a candidate TCES material for such a system at temperature around 300 °C, and adaptable when doping Mg(OH) 2 with metal salts. Both pure Mg(OH) 2 and its composites with 1, 3, 6 and 10 wt% LiNO 3 are studied. The present work validates this TCES process and develops reaction rate equations needed for its design. The LiNO 3- doping significantly reduces the onset temperature of dehydration. For pure Mg(OH) 2 , the temperature is 325 °C. It is reduced to 289 °C when 1 wt% LiNO 3 is present, and further reduced to 269 °C at a dosage of 10 wt% LiNO 3 . Whereas the dehydration of pure Mg(OH) 2 is slow, with a rate constant k of 1.72 10 −5 s −1 at 300 °C, adding increasing amounts of LiNO 3 progressively increases the reaction rate constant to ~10 −2 s −1 at 300 °C when 10 wt% LiNO 3 is present. The kinetic expressions enable to predict the conversion yield and amount of heat stored or released for any desired temperature and selected duration of the heat-induced dehydration. LiNO 3- doped Mg(OH) 2 have a high potential in TCES applications when the heat source is available at temperatures between 250 and 400 °C, since the equilibrium temperature and the extent of de-hydration Mg(OH) 2 can be tuned to the required temperature range by adding different wt% of LiNO 3 .
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2018
·
IF 13.12
Jin Tan,Jialong Duan,Yuanyuan Zhao,Benlin He,Qunwei Tang
It is a challenge to harvest ocean wave energy by electrokinetic principle. We present here film-type generators made of carbon for wave energy harvest. The electrical signals arise from charge transportation along percolating channels driven by moving electric double-layer boundary at generator/seawater interfaces. Both voltage and current outputs are maximized by optimizing carbon dosage, wave frequency, hoisting angle and seawater temperature, producing a voltage of > 20 mV and a current of > 10 microamp from a 15 cm 2 -sized generator. We illustrate the electricity can be scaled up through series and parallel connections of multiple generators. Upon persistently rushing by waves, these film-type generators are stable over several hours. This approach to ocean wave energy harvest provides new opportunities for unprecedented low-investment, scalable power outputs and high stability.
研究领域:
能源材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
ENERGY
·
2015
·
IF 4.844
Zhihao Pan,C.Y. Zhao
Thermal energy storage systems improve the inefficiency of industrial processes and renewable energy systems (supply versus demand). Chemical reaction is a promising way to store thermal energy because of its high energy storage density , long-term energy storage, etc. This study investigated an MgO/H 2 O chemical thermal storage system that stores thermal energy by decomposing Mg(OH) 2 (endothermic reaction), and supplies thermal energy by combining water vapor with MgO (exothermic reaction). Heat supply is greatly influenced by MgO properties, particularly dehydration temperature. Therefore, the equilibrium hydration fractions of MgO prepared at various dehydration temperatures were measured. Then, the relation between dehydration temperature and the equilibrium hydration fractions of MgO was determined. The equilibrium hydration fractions of MgO at various hydration temperatures and pressures were also measured. The chemical thermal storage system was inefficient at dehydration temperatures lower than 350 °C or higher than 500 °C. The efficiency of this system can be improved by increasing the hydration temperature while keeping the relative vapor pressure unchanged.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 111
·91308-91314
·
IF 3.84
Chunning Heng,Meiying Liu,Ke Wang,Xiaoyan Zheng,Hongye Huang,Fengjie Deng,Junfeng Hui,Xiaoyong Zhang,Yen Wei
A highly benign, simple and effective strategy was successfully developed for the first time for the fabrication of hydrophilic thermo-responsive polymer modified silica nanoparticles (SiO2-PDA-poly(NIPAM)) at low temperature and under mild reaction conditions via a combination of mussel inspired chemistry and SET-LRP. The SiO2 NPs were first modified with polydopamine (PDA), which was formed by the self-polymerization of dopamine under rather mild conditions. 2-Bromo-2-methylpropionyl bromide was covalently attached on the surface of the PDA modified SiO2 NPs. Afterward, the poly(NIPAM) was grown in situ on the surface of the Br-containing SiO2 NPs by the SET-LRP method. Consequently, the surface of the SiO2-PDA nanoparticles is intrinsically covered by a layer of free poly(NIPAM) chains, which enables the poly(NIPAM) to be colloidally stable not only at room temperature, but also upon incubation in the presence of proteins under physiological conditions. After modifying with PNIPAM, the functional SiO2 NPs retain their pristine structure, however their dispersibility was significantly improved in polar and nonpolar solutions. As compared with previous methods, the strategy developed in this work is rather simple and effective. More importantly, due to the universality of mussel inspired chemistry, this novel strategy could also be used for the surface modification of many other materials.
研究领域:
材料科学
·
聚合物化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Animal Nutrition
·
2024
·
IF 6.1
Xiao Li,Jing Li,Kangle Lu,Xueshan Li,Kai Song,Ling Wang,Chunxiao Zhang
A 10-week feeding trial, followed by 24-h nitrite stress, was performed to evaluate the effects of dietary selenium-L-methionine (Se-Met) on growth, Se accumulation, antioxidant capacity, transcripts of selenoproteins and histological changes of muscle as well as resistance to nitrite stress in spotted seabass ( Lateolabrax maculatus ) reared at optimal (27 °C) and high (33 °C) temperatures. Five experimental diets were formulated to contain 0, 0.9, 1.8, 3.5, and 7.0 mg Se-Met/kg. Each diet was fed to fish (2.60 ± 0.2 g) in two parallel treatments at 27 or 33 °C. The results showed that elevated temperature (33 °C) induced thermal stress in fish, and fish under thermal stress exhibited lower weight gain (WG) and hepatosomatic index (HSI) but a higher condition factor (CF) compared to those reared at 27 °C. However, the growth and feed utilisation were promoted in L. maculatus with 0.9 to 3.5 mg/kg Se-Met treatments. The protein and lipid content in the muscle increased with the dietary Se-Met level, and the total Se level in the whole body and muscle showed a linear increase with dietary Se-Met supplementation. Thermal stress changed the histology of the muscle, leading to raised levels of malondialdehyde (MDA), reduced antioxidant parameters in the serum and liver, and a decrease in the transcripts of selenoprotein genes in the muscle. Meanwhile, increased antioxidant capacity of serum and liver and up-regulated transcripts of selenoprotein of muscle were observed in L. maculatus reaching a maximum with 3.5 mg Se-Met/kg treatment. After 24 h of nitrite stress, thermal stress exacerbated oxidative damage caused by nitrite stress in L. maculatus . In contrast, dietary Se-Met enhanced the resistance to nitrite stress of L . maculatus fed with Se-Met enriched diets containing 0.9 to 1.8 mg Se-Met/kg. Based on the effects of dietary Se-Met on the growth, antioxidant capacity and resistance to nitrite stress of L. maculatus , this study suggests that the optimal range of Se-Met supplementation in L. maculatus diets is 1.80 to 2.39 mg Se-Met/kg of diet at 27 °C and 1.80 to 4.46 mg Se-Met/kg of diet at 33 °C.
研究领域:
水产养殖
·
营养学
·
生理学
·
应激生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2024
·Vol. 108
·期 1
·1-17
·
IF 3.9
Li Meng,Ghonimy Abdallah,Chen Dai-Qiang,Li Ji-Tao,He Yu-Ying,López Greco Laura Susana,Dyzenchauz Fernando,Chang Zhi-Qiang
The gut microbial communities interact with the host immunity and physiological functions. In this study, we investigated the bacterial composition in Litopenaeus vannamei shrimp’s gut and rearing water under different host (developmental stage: juvenile and adult; health status: healthy and diseased) and environmental factors (temperature 25 °C and 28 °C; and light intensity: low and high). The PCoA analysis showed that all water samples were clustered together in a quarter, whereas the gut samples spread among three quarters. In terms of functional bacteria, gut samples of adult shrimp, healthy adult shrimp, adult shrimp raised at 28 °C, and juvenile shrimp under high light intensity exhibited a higher abundance of Vibrionaceae compared to each other opposite group. Gut samples of juvenile shrimp, infected adult shrimp, juvenile shrimp with low light intensity, and adult shrimp with a water temperature of 25 °C showed a higher abundance of Pseudoaltromonadaceae bacteria compared to each other opposite group. Gut samples of juvenile shrimp, healthy adult shrimp, adult shrimp raised at a water temperature of 28 °C, and juvenile shrimp with high light intensity showed the higher abundance of Firmicutes / Bacteroidota ratio compared to each other opposite group. Our results showed that L. vannamei juveniles are more sensitive to bacterial infections; besides, water temperature of 28 °C and high light intensity groups were both important conditions improving the shrimp gut bacterial composition under industrial indoor farming systems. Key points • Bacteria diversity was higher among shrimp intestinal microbiota compared to the rearing water . • Shrimp juveniles are more sensitive to bacterial infection compared to adults . • Water temperature of 28 °C and high light intensity are recommended conditions for white shrimp aquaculture . Graphical
研究领域:
水产养殖
·
微生物学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Soft Matter
·
2023
·Vol. 19
·期 34
·6468-6479
·
IF 3.4
Hongyue Wu,Bolun Zhang,Xiaochen Liu,Yuzhou Liu,Jing Cui,Zhongyi Chu
Microstructure adhesive pads can effectively manipulate objects in underwater environments. Current adhesive pads can achieve adhesion and separation with rigid substrates underwater; however, challenges remain in the control of adhesion and detachment of flexible materials. Additionally, underwater object manipulation necessitates considerable pre-pressure and is sensitive to water temperature fluctuations, potentially causing object damage and complicating adhesion and detachment processes. Thus, we present a novel, controllable adhesive pad inspired by the functional attributes of microwedge adhesive pads, combined with a mussel-inspired copolymer (MAPMC). In the context of underwater applications for flexible materials, the use of a microstructure adhesion pad with microwedge characteristics (MAPMCs) is a proficient approach to adhesion and detachment operations. This innovative method relies on the precise manipulation of the microwedge structure's collapse and recovery during its operation, which serves as the foundation for its efficacy in such environments. MAPMCs exhibit self-recovering elasticity, water flow interaction, and tunable underwater adhesion and detachment. Numerical simulations elucidate the synergistic effects of MAPMCs, highlighting the advantages of the microwedge structure for controllable, non-damaging adhesion and separation processes. The integration of MAPMCs into a gripping mechanism allows for the handling of diverse objects in underwater environments. Furthermore, by merging MAPMCs and a gripper within a linked system, our approach enables automatic, non-damaging adhesion, manipulation, and release of a soft jellyfish model. The experimental results indicate the potential applicability of MACMPs in underwater operations.
研究领域:
材料科学
·
仿生学
·
水下机器人
·
粘附技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）