检索结果-南通市图书馆

The release and catabolism of ferulic acid in plant cell wall by rumen microbes:A review

在线全文

学校读者我要写书评

暂无评论

Animal Nutrition 2022年第2期9卷 335-344页

作者： Yan-Lu Wang Wei-Kang Wang Qi-Chao Wu hong-jian yang State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China

Ferulic acid(FA)is one of the most abundant hydroxycinnamic acids in the plant world,especially in the cell wall of grain bran,in comparison with forage and crop *** studies noted that FA was mainly linked with arabinoxylans and lignin in plant cell walls in ester and ether covalent *** forages were ingested by ruminant animals or encountered rumen microbial fermentation in vitro,these cross-linkages form physical and chemical barriers to protect cell-wall carbohydrates from microbial attack and enzymatic ***,increasing studies noted that FA presented some toxic effect on microbial growth in the *** recent decades,many studies have addressed the relationships of ester and/or ether-linked FA with rumen nutrient digestibility,and there is still some controversy whether these linkages could be used as a predicator of forage digestibility in *** authors in this review summarized the possible relationships between ester and/or ether-linked FA and fiber digestion in *** microbes,especially bacteria and fungi,were found capable of breaking down the ester linkages within plant cell walls by secreting feruloyl and p-coumaroyl esterase,resulting in the release of free FA and improvement of cell wall *** increasing evidence noted that these esterases secreted by rumen microbes presented synergistic effects with xylanase and cellulase to effectively hydrolyze forage cell *** released FA were absorbed through the rumen wall directly and entered into blood circulation and presented antioxidant effects on host *** others were partially catabolized into volatile fatty acids by rumen microbes,and the possible catabolic pathways *** better understand plant cell wall degradation in the rumen,the metabolic fate of FA along with lignin decomposition mechanisms are needed to be explored via future microbial isolation and incubation studies with aims to maximize dietary fiber intake

关键词： Rumen microbes Ferulic acid Fiber digestion

Unilateral hemilaminectomy for patients with intradural extramedullary tumors

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第7期12卷 575-581页

作者： Cai-xing SUN Xu-li MENG Shang-nao XIE yang YU hong-jian yang Bin WU Zhejiang Traditional Medical University Hangzhou 310009 China Department of Neurooncology Zhejiang Cancer Hospital Hangzhou 310009 China

A modified hemilaminectomy was introduced in an attempt to explore the operative techniques and the values of the limited approach to spinal cord ***-five consecutive patients with intradural extramedullary lesions,who underwent modified hemilaminectomy,were studied *** intraspinal tumors were removed via the limited bone window with a 3.3-cm mean length (range: 2.0–6.5 cm) and a 1.2-cm mean width (range: 0.6–1.5 cm),in which the inner parts of the medial and lateral laminae were mostly undercut for wider *** lesions were cervical in 21 cases,thoracic in 12 cases,lumbar in 10 cases,and multiple in 2 ***-three cases were completely excised via hemilaminectomy *** subjects with dumbbell neurinoma underwent two-stage tumor removal via anterolateral cervical approach following *** respect to neurological status,the percentage of good Frankel scale (D+E grade) was markedly improved from 22.2% on admission to 93.3% at *** the median 26-month follow-up evaluation by magnetic resonance imaging (MRI),none of the subjects showed spinal deformity or *** preserving musculoligamentous attachments and posterior bony elements as much as possible,the modified approach is minimally invasive and may be routinely used to remove intradural and extramedullary tumors,especially in patients with meningiomas and neurinomas.

关键词： Hemilaminectomy Spinal cord tumors Microsurgery

Optimization of Grasping Efficiency of a Robot Used for Sorting Construction and Demolition Waste

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2020年第5期17卷 691-700页

作者： Yue-Dong Ku jian-hong yang Huai-Ying Fang Wen Xiao jiang-Teng Zhuang College of Mechanical Engineering and Automation Huaqiao UniversityXiamen 361000China

The recycling of construction and demolition waste(CDW)remains an urgent problem to be *** the industry,raw CDW needs to be manually *** achieve high efficiency and avoid the risks of manual sorting,a sorting robot can be designed to grasp and sort CDW on a conveyor *** dynamic grasping on the conveyor belt is a *** collected location information with a three-dimensional camera and then evaluated the method of dynamic robotic *** paper discusses the grasping strategy of rough processed CDW on the conveyor belt,and implements the function of grasping and sorting on the recycling ***,two new mathematical models for a robotic locating system are established,the accuracy of the model is tested with Matlab,and the selected model is applied to actual working conditions to verify the sorting ***,the robot kinematics parameters are optimized to improve the sorting efficiency through experiments in a real system,and it was concluded that when the conveyor speed was kept at around 0.25 m/s,better sorting results could be *** the speed and shortening the acceleration/deceleration time would reach the maximum efficiency when the load would allow ***,the sorting efficiency reached approximately 2000 pieces per hour,showing a high accuracy.

关键词： Construction and demolition waste sorting robot grasping strategy mathematical models robot kinematics parameters

Gossypol detoxification in the rumen and Helicoverpa armigera larvae:A review

在线全文

学校读者我要写书评

暂无评论

Animal Nutrition 2021年第4期7卷 967-972页

作者： Wei-Kang Wang hong-jian yang Yan-Lu Wang Kai-Lun yang Lin-Shu jiang Sheng-Li Li State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China Beijing Engineering Technology Research Center of Raw Milk Quality and Safety Control College of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China College of Animal Sciences Xinjiang Agricultural UniversityUrumuqi830052China College of Animal Science and Technology Beijing University of AgricultureBeijing102206China

Gossypol,a phenolic compound found in the cotton plant,is widely distributed in cottonseed *** ruminant animals are believed to be more tolerant of gossypol toxicity than monogastric animals due to rumen microbial fermentation,the actual mechanisms of detoxification remain *** contrast,the metabolic detoxification of gossypol by Helicoverpa armigera(Lepidoptera:Noctuidae)larvae has achieved great *** present review discusses the clinical signs of go ssypol in ruminant animals,as well as summarizing advances in the study of gossypol detoxification in the *** also examines the regulatory roles of several key enzymes in gossypol detoxification and transformation known in *** the rapid development of modern molecular biotechnology and-omics technology strategies,evidence increasingly indicates that research into the biological degradation of gossypol in *** larvae and some microbes,in terms of these key enzymes,could provide scientific insights that would underpin future work on microbial gossypol detoxification in the rumen,with the ultimate aim of further alleviating gossypol toxicity in ruminant animals.

关键词： Detoxification Gossypol Helicoverpa armigera Rumen

Two new compounds from Coriaria nepalensis

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第9期22卷 1078-1080页

作者： jian hong yang jian Xin Pu Xue Du Hai Bo Zhang Wei Lie Xiao Han Dong Sun State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of Botany Chinese Academy of Sciences Kuming 650204 China

Two new compounds. corialins A （1） and B （2） were isolated from Coriaria nepulensis Wall. These new compounds were established as 7-hydroxy-3-[2,3-acetonidc-（3-methylhutane）] coumarin （1） and 3-O-β-D-glucopyr... 详细信息

关键词： Coriaria nepalensis Corialin A Corialin B NMR techniques

Symptom of the Shrunk-Grain Panicle and the Change Characteristics in Its Grain

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2008年第1期7卷 10-18页

作者： ZHANG Zu-jian LANG You-zhong PAN Mei-hong yang jian-chang ZHU Qing-sen Key Laboratory of Crop Genetics and Physiology of jiangsu Province Yangzhou University Yangzhou 225009 P.R.China

Over the past two years, an abnormal growth phenomenon jiangsu Province of China. The phenomenon is described in called shrunk-grain panicle has occurred in a large area in details by figures and characters in this article. The method with a japonica rice Wuyujing 3 as the experimental material, the characteristics of grain morphology distribution and the grain weight were studied. Normal and shrunk-grain panicles were sampled from several representative areas. The length, width, and weight of the normal grains were distributed as regular, continuous, and single peaks. Plant growth typically had a right-leaning tendency. On the contrary, the distribution of the grain morphology and weight were irregular and nearly double that of the shrunk-grain panicle. The proportion of the cumulative distribution in the two kinds of peaks was closely related to the degree of shrunk-grain panicle. The article discusses the phenomenon＇s symptoms, problems, and diagnosis.

关键词： rice japonica shrunk-grain panicle symptom grain weight distribution

Effects of high-energy proton irradiation on separate absorption and multiplication GaN avalanche photodiode

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2018年第10期29卷 155-162页

作者： Gui-Peng Liu Xin Wang Meng-Nan Li Zheng-Peng Pang Yong-Hui Tian jian-hong yang Institute of Microelectronics School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China China Academy of Electronic and Information Technology Beijing 100041China

The effect of high-energy proton irradiation on GaN-based ultraviolet avalanche photodiodes(APDs) is investigated. The dark current of the GaN APD is calculated as a function of the proton energy and proton fluences. By considering the diffusion, generation–recombination, local hopping conductivity, band-to-band tunneling, and trap-assisted tunneling currents, we found that the dark current increases as the proton fluence increases, but decreases with increasing proton energy.

关键词： Proton irradiation GaN avalanche photodiode(APD) Dark current Detectors

Wheat silage partially replacing oaten hay exhibited greater feed efficiency and fibre digestion despite low feed intake by feedlot lambs

在线全文

学校读者我要写书评

暂无评论

Animal Nutrition 2023年第4期15卷 332-340页

作者： Zhao-yang Cui Wen-Juan Li Wei-Kang Wang Qi-Chao Wu Yao-Wen jiang Ailiyasi Aisikaer Fan Zhang He-Wei Chen hong-jian yang State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China

This study aimed to investigate the feeding effect of wheat silage on growth performance,nutrient digestibility,rumen fermentation,and microbiota composition in feedlot ***-four male crossbred Chinese Han lambs(BW=27.8±0.67 kg,3 months of age)were randomly assigned to four ration groups with wheat silage replacing 0%(WS0),36%(WS36),64%(WS64),and 100%(WS100)of oaten hay on forage dry matter *** concentrate-to-forage ratio was 80:20 and the feeding trial lasted 52 *** wheat silage inclusion linearly decreased dry matter intake by 4%to 27%(P<0.01).However,increasing the wheat silage replacement of oaten hay by no more than 64%improved the feed efficiency by 14%as noted by the feed-to-gain ratio(P=0.04).Apparent digestibility of organic matter(P<0.01),neutral detergent fibre(P=0.04)and acid detergent fibre(P<0.01)quadratically *** nitrogen(P=0.01)decreased while microbial protein production(P<0.01)increased with the increase of wheat silage *** volatile fatty acids concentration increased quadratically with the increase of wheat silage inclusion(P<0.01),and the highest occurred in *** molar proportion of acetate(P<0.01)and acetate-to-propionate ratio(P=0.04)decreased while butyrate(P<0.01)and isovalerate(P=0.04)*** wheat silage inclusion increased the Firmicutes-toBacteroidota ratio by 226%to 357%,resulting in Firmicutes instead of Bacteroidota being the most abundant *** relative abundance of cellulolytic Ruminococcus numerically increased but that of amylolytic Prevotella(P<0.01)decreased as increasing wheat silage *** together,increasing wheat silage replacement of oaten hay by no more than 64%exhibited greater feed efficiency and fibre digestion despite low feed intake by feedlot lambs due to the change of Firmicutes-to-Bacteroidota ratio in the rumen.

关键词： Wheat silage Oaten hay Growth performance Nutrient digestibility Rumen fermentation Feedlot lamb

Analysis of the decrease of two-dimensional electron gas concentration in GaN-based HEMT caused by proton irradiation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第2期30卷 467-471页

作者： Jin-Jin Tang Gui-Peng Liu Jia-Yu Song Gui-Juan Zhao jian-hong yang School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China National&Local Joint Engineering Laboratory of Light-conversion Materials and Technology School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China

Gallium nitride(Ga N)-based high electron mobility transistors(HEMTs)that work in aerospace are exposed to particles radiation,which can cause the degradation in electrical *** investigate the effect of proton irradiation on the concentration of two-dimensional electron gas(2 DEG)in Ga N-based *** Schr¨odinger’s and Poisson’s equations are solved to calculate the band structure and the concentration of 2 DEG by the self-consistency method,in which the vacancies caused by proton irradiation are taken into *** irradiation simulation for Ga N-based HEMT is carried out using the stopping and range of ions in matter(SRIM)simulation software,after which a theoretical model is established to analyze how proton irradiation affects the concentration of 2 *** by protons with high fluence and low energy,a large number of Ga vacancies appear inside the *** results indicate that the ionized Ga vacancies in the Ga N cap layer and the Al Ga N layer will affect the Fermi level,while the Ga vacancies in the Ga N layer will trap the two-dimensional electrons in the potential *** irradiation significantly reduced the concentration of 2 DEG by the combined effect of these two mechanisms.

关键词： proton irradiation GaN-based HEMT two-dimensional electron concentration