检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

9H级燃机燃烧系统夏季调整分析

电力安全技术 2024年第2期26卷 58-62页

作者：索志城马宝华天津军粮城发电有限公司天津300300

以9H级重型燃机为研究对象,介绍了其燃烧系统的结构特点及燃烧模式,通过对燃机燃烧调整相关的数据分析,找出燃料流量与燃机负荷、压气机压比与燃机负荷以及燃机透平冷却时冷却阀运行的规律,为燃机夏季工况下的安全稳定运行提供理论支撑。

关键词：重型燃机燃烧系统燃烧调整燃料流量压气机压比

Effect of the chlortetracycline addition method on methane production from the anaerobic digestion of swine wastewater

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2014年第10期26卷 2001-2006页

作者： Lu Huang Xin Wen Yan Wang Yongde Zou baohua ma Xindi Liao Juanboo Liang Yinbao Wu College of Animal Science National Engineering Research Center for Breeding Swine Industry South China Agricultural University Ministry of Agriculture Key Laboratory of Tropical Agricultural Environment South China Agricultural University Guangdong Enterprise Lab of Healthy Animal Husbandry and Environment Control Nanhai Entry-Exit Inspection and Quarantine Bureau Institute of Tropical Agriculture Universiti Putra Malaysia43400 Serdang Malaysia

Effects of antibiotic residues on methane production in anaerobic digestion are commonly studied using the following two antibiotic addition methods：（1） adding manure from animals that consume a diet containing antibiotics, and（2） adding antibiotic-free animal manure spiked with antibiotics. This study used chlortetracycline（CTC） as a model antibiotic to examine the effects of the antibiotic addition method on methane production in anaerobic digestion under two different swine wastewater concentrations（0.55 and 0.22 mg CTC/g dry manure）. The results showed that CTC degradation rate in which manure was directly added at 0.55 mg CTC/g（HSPIKE treatment） was lower than the control values and the rest of the treatment groups. Methane production from the HSPIKEtreatment was reduced（p 〈 0.05） by 12% during the whole experimental period and 15% during the first 7 days. The treatments had no significant effect on the pH and chemical oxygen demand value of the digesters, and the total nitrogen of the0.55 mg CTC/kg manure collected from mediated swine was significantly higher than the other values. Therefore, different methane production under different antibiotic addition methods might be explained by the microbial activity and the concentrations of antibiotic intermediate products and metabolites. Because the primary entry route of veterinary antibiotics into an anaerobic digester is by contaminated animal manure, the most appropriate method for studying antibiotic residue effects on methane production may be using manure from animals that are given a particular antibiotic, rather than adding the antibiotic directly to the anaerobic digester.

关键词： Chlortetracycline Methane production Psychrophilic anaerobic digestion Addition methods

Photocatalytic performance of TiO_2 immobilized on polystyrene (PS) thin film for mineralization of pollutants

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2003年第2期22卷 137-143页

作者： GAO Yuan, YU Wei, CHEN baohua, ma Yongxiang, and LI HulinDepartment of Chemistry, Lanzhou University, Lanzhou 730000, China (Receeived 2002-02-26) Department of Chemistry Lanzhou University Lanzhou 730000

A new photocatalyst, TiO_2 powder immobilized on polystyrene (PS) thin films,was prepared using a novel method and its photocatalytic activity on the photodegradation ofacridine dye in aqueous solution was tested. By this method, the crystal form and grain size of theimmobilized TiO_2 were well maintained. Compared with TiO_2 powder, the photocatalytic activity ofTiO_2/PS thin films was not significantly reduced. The catalyst is stable and can be reused severaltimes without the loss of activity, which makes wastewater treatment using this photocatalyticdegradation technique of this way possible in the practical application.

关键词： physical chemistry loaded photocatalyst TiO_2 acridine dye fluidifying sedimentation container

Sulforaphane prevents LPS‑induced inflammation by regulating the Nrf2‑mediated autophagy pathway in goat mammary epithelial cells and a mouse model of mastitis

在线全文

学校读者我要写书评

暂无评论

畜牧与生物技术杂志:英文版 2023年第5期14卷 2093-2106页

作者： Dan Shao Wenxiang Shen Yuyang Miao Zhen Gao Menghao Pan Qiang Wei Zuoting Yan Xiaoe Zhao baohua ma Key Laboratory of Animal Biotechnology of the Ministry of Agriculture College of Veterinary MedicineNorthwest A&F UniversityYangling 712100ShaanxiChina Lanzhou Institute of Husbandry and Pharmaceutical Sciences Chinese Academy of Agricultural ScienceLanzhou 730050China

Background mastitis not only deteriorates the composition or quality of milk,but also damages the health and pro-ductivity of dairy ***(SFN)is a phytochemical isothiocyanate compound with various pharmacologi-cal effects such as anti-oxidant and ***,the effect of SFN on mastitis has yet to be *** study aimed to explore the anti-oxidant and anti-inflammatory effects and potential molecular mechanisms of SFN in lipopolysaccharide(LPS)-induced primary goat mammary epithelial cells(GMECs)and a mouse model of *** In vitro,SFN downregulated the mRNA expression of inflammatory factors(tumor necrosis factor-α(TNF-α),interleukin(IL)-1βand IL-6),inhibited the protein expression of inflammatory mediators(cyclooxygenase-2(COX2),and inducible nitric oxide synthase(iNOS))while suppressing nuclear factor kappa-B(NF-κB)activation in LPS-induced ***,SFN exhibited an antioxidant effect by increasing Nrf2 expression and nuclear translocation,up-regulating antioxidant enzymes expression,and decreasing LPS-induced reactive oxygen species(ROS)produc-tion in ***,SFN pretreatment promoted the autophagy pathway,which was dependent on the increased Nrf2 level,and contributed significantly to the improved LPS-induced oxidative stress and inflammatory *** vivo,SFN effectively alleviated histopathological lesions,suppressed the expression of inflammatory factors,enhanced immunohistochemistry staining of Nrf2,and amplified of LC3 puncta LPS-induced mastitis in ***,the in vitro and in vivo study showed that the anti-inflammatory and anti-oxidative stress effects of SFN were mediated by the Nrf2-mediated autophagy pathway in GMECs and a mouse model of *** These results indicate that the natural compound SFN has a preventive effect on LPS-induced inflam-mation through by regulating the Nrf2-mediated autophagy pathway in primary goat mammary epithelial cells and a mouse m

关键词： Autophagy Goat mammary epithelial cells Inflammation Nrf2 Oxidative stress Sulforaphane

Ultra-high NA graphene oxide flat lens on a fiber facet with near diffraction-limited focusing

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2024年第7期12卷 1457-1463页

作者： XIAOKE CHEN LIN ma ZUYUAN HE GUIYUAN CAO HAN LIN baohua JIA State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China School of Science RMIT UniversityMelbourne VIC 3000Australia The Australian Research Council(ARC)Industrial Transformation Training Centre in Surface Engineering for Advanced materials(SEAM) RMIT UniversityMelbourne VIC 3000Australia

The realization of a high numerical aperture(NA) fiber lens is critical for achieving high imaging resolution in endoscopes, enabling subwavelength operation in optical tweezers and high efficiency coupling between optical fibers and photonic chips. However, it remains challenging with conventional design and fabrication. Here we propose an ultrathin(400 nm) graphene oxide(GO) film lens fabricated in situ on a standard single-mode fiber facet using the femtosecond laser direct writing technique. An extremely high NA of 0.89 is achieved with a near diffraction-limited focal spot(FWHM = 0.68λ), which is verified theoretically and experimentally. The diameter of the fabricated fiber GO lens is as small as 12 μm with no beam expansion structure. The proposed fiber GO lens is promising for applications such as super-resolution imaging, compact optical tweezers, medical endoscopes,and on-chip integration.

关键词： fiber high oxide

Enhancing capacitive deionization performance and cyclic stability of nitrogen-doped activated carbon by the electro-oxidation of anode materials

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第5期69卷 23-33页

作者： Xiaona Liu baohua Zhao Yanyun Hu Luyue Huang Jingxiang ma Shuqiao Xu Zhonglin Xia Xiaoying ma Shuangchen ma School of Environmental Science and Engineering North China Electric Power UniversityBaoding 071003China Huadian Zhengzhou machinery Design and Research Institute Co. LtdZhengzhou 450002China Huadian Inner Mongolia Energy Co. Ltd.Baotou Power Generation BranchBaotou 014013China

Electrode materials with high desalination capacity and long-term cyclic stability are the focus of capacitive deionization(CDI) community. Understanding the causes of performance decay in traditional carbons is crucial to design a high-performance material. Based on this, here, nitrogen-doped activated carbon(NAC) was prepared by pyrolyzing the blend of activated carbon powder(ACP) and melamine for the positive electrode of asymmetric CDI. By comparing the indicators changes such as conductivity, salt adsorption capacity, pH, and charge efficiency of the symmetrical ACP-ACP device to the asymmetric ACP-NAC device under different CDI cycles, as well as the changes of the electrochemical properties of anode and cathode materials after long-term operation, the reasons for the decline of the stability of the CDI performance were revealed. It was found that the carboxyl functional groups generated by the electro-oxidation of anode carbon materials make the anode zero-charge potential(E_(pzc)) shift positively,which results in the uneven distribution of potential windows of CDI units and affects the adsorption capacity. Furthermore, by understanding the electron density on C atoms surrounding the N atoms, we attribute the increased cyclic stability to the enhanced negativity of the charge of carbon atoms adjacent to quaternary-N and pyridinic-oxide-N.

关键词： Anodic oxidation Capacitive deionization Cyclic stability N-doping

Development of mouse preimplantation embryos in space

在线全文

学校读者我要写书评

暂无评论

National Science Review 2020年第9期7卷 1437-1446页

作者： Xiaohua Lei Yujing Cao baohua ma Yunfang Zhang Lina Ning Jingjing Qian Liwen Zhang Yongcun Qu Tao Zhang Dehong Li Qi Chen Junchao Shi Xudong Zhang Chiyuan ma Ying Zhang Enkui Duan State Key Laboratory of Stem Cell and Reproductive Biology Institute of ZoologyChinese Academy of Sciences University of Chinese Academy of Sciences Shanghai Institute of Technical Physics Chinese Academy of Sciences Division of Ionizing Radiation National Institute of Metrology College of Veterinary Medicine Northwest A&F University/Key Laboratory of Animal BiotechnologyMinistry of Agriculture

The development of life beyond planet Earth is a long-standing quest of the human race, but whether normal mammalian embryonic development can occur in space is still unclear. Here, we show unequivocally that preimplantation mouse embryos can develop in space, but the rate of blastocyst formation and blastocyst quality are compromised. Additionally, the cells in the embryo contain severe DNA damage, while the genome of the blastocysts developed in space is globally hypomethylated with a unique set of differentially methylated regions. The developmental defects, DNA damage and epigenetic abnormalities can be largely mimicked by the treatment with ground-based low-dose radiation. However,the exposure to simulated microgravity alone does not cause major disruptions of embryonic development,indicating that radiation is the main cause for the developmental defects. This work advances the understanding of embryonic development in space and reveals long-term extreme low-dose radiation as a hazardous factor for mammalian reproduction.

关键词： space-flight radiation microgravity preimplantation development DNA damage DNA methylation

Melatonin alleviates heat stress‑induced testicular damage in dairy goats by inhibiting the PI3K/AKT signaling pathway

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Stress Biology 2022年第1期2卷 120-135页

作者： Yundie Liu Hui Cai Xinrui Guo Aili Aierken Jinlian Hua baohua ma Sha Peng College of Veterinary Medicine Shaanxi Centre of Stem Cells Engineering&TechnologyNorthwest Agriculture and Forestry University of Science and TechnologyYangling 712100ShaanxiChina

Current measures mainly focus on how melatonin reduces physiological heat stress in animals,but its effects on reproductive damage to male dairy goats have been *** study aimed to determine the protective effect of melatonin on male reproduction during heat stress in dairy goats and to further explore its mechanisms.A natural heat stress model of Saanen dairy goats was used to assess testicular tissue damage 7days after heat stress and to examine semen quality changes during a spermatogenic ***-seq,Western blot,RT–qPCR,and immunofluo-rescence staining were used to explore the mechanism by which melatonin protects against heat stress-induced reproductive damage and to validate the *** data suggested that melatonin significantly alleviated the heat stress-induced decrease in sperm quality,protected varicose tubule structure,reduced the levels of heat shock proteins and apoptotic proteins and protected the spermatocytes and round spermatozoa,which are mainly affected by heat ***-seq results suggest that melatonin inhibits the PI3K/AKT signaling pathway,reduces the level of p-AKT,and promotes elevated *** addition,melatonin treatment could upregulate the gene expression of MT2 which was downregulated by heat stress and improve the change in extracellular matrix components and restore serum testosterone *** results suggest that melatonin can protect against testicular and spermatogenic cell damage and improve semen quality in male dairy goats under heat *** study provides an important reference for subsequent studies on the molecular mechanisms of melatonin in protecting male reproductive processes under heat stress and using exogenous melatonin to prevent heat stress.

关键词： Natural heat stress Melatonin PI3K/AKT signaling pathway Spermatocytes Apoptosis

Gut microbiota-derived metabolites contribute negatively to hindgut barrier function development at the early weaning goat model

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Animal Nutrition 2022年第3期10卷 111-123页

作者： Ke Zhang Yangbin Xu Yuxin Yang Mengmeng Guo Ting Zhang Bo Zong Shuhong Huang Langda Suo baohua ma Xiaolong Wang Yujiang Wu Daniel Brugger Yulin Chen Key Laboratory of Animal Genetics Breeding and Reproduction of Shaanxi ProvinceCollege of Animal Science and TechnologyNorthwest A&F UniversityYangling712100China College of Veterinary Medicine Northwest A&F UniversityYangling712100China Institute of Animal Sciences Tibet Academy of Agricultural and Animal Husbandry SciencesLhasa850009China Institute of Animal Nutrition and Dietetics Vetsuisse-FacultyUniversity of Zurich8057ZurichSwitzerland

Early weaning induces intestinal injury,leading to a series of long-term symptoms such as inflammation,malabsorption and *** this study,we hypothesized that microbes and theirmetabolitesmodulate the host's inflammatory response to early weaning stress in a goatmodel.A total of 18 female Tibetan goat kids(n?9)wereweaned fromtheirmothers at 28 d(D28)and 60 d(D60)postpartum.D60 and D28 groupswere fed the same solid diet ad libitum fromweaning to 75 d of *** colonic epithelium was subject to RNAsequencing,the caecal digesta metabolomics were assessed by liquid chromatographyetandem mass spectrometry(LC-MS/MS),and the caecal microbiota composition was analysed by 16S ribosomal RNA gene *** foundthatearlyweaningsubstantially increased the colonic pro-apoptotic gene expressionof B-cell lymphoma associated X(Bax),caspase-9,and caspase-3,and decreased the expression of zonula occludens-1(ZO-1)and claudin-1(P<0.01).In addition,a significant Bacteroides acidifaciens enrichmentwas observed in the hindgut of early-weaned goats(P<0.01),which negatively correlated with lysophosphatidylcholine ***,the chemokine signaling,IL-17 signaling,and peroxisome proliferatorsactivated receptor(PPAR)signaling pathways were upregulated in the colonic mucosa of the early-weaned *** applying caecal microbiota transplantation from goats to defaunated C57/6J mice,we confirmed that caecalmicrobiota of D28 goat kids increased the relative abundance of *** and significantly upregulated the genes of Bax,G proteinecoupled receptor(GPR)109A,GPR 43,fatty acid binding protein 6,nuclear receptor subfamily 1 group H member 3,angiotensin converting enzyme 2,and IL-6 expression(P<0.05),and decreased ZO-1,and claudin-1 protein expression in the mice jejunum and colon(P<0.001).These results proposed that the hindgut microbiota andmetabolites mediate the barrier functionweakening duringearlyweaning,and the relative abundance of *** negatively corr

关键词： Hindgut microbiome Ruminant Dysbiosis Inflammation Colon