检索结果-南通市图书馆

Different maternal investment strategies for male and female calves in a polygynous mammal

Current Zoology 2019年第3期65卷 269-277页

作者： Francisco CEACERO Martina KOMARKOVA Andres J.GARCIA Laureano GALLEGO Department of Animal Science and Food Processing Faculty of Tropical AgriSciencesCzech University of Life Sciences Kamycka 12916500 Praha 6-Suchdol Czech Republic Department of Ethology Institute of Animal Science Pratelstvi 815 10401 Praha - Uhnneves Czech Republic Instituto de Investigacion en Recursos Cinegeticos (IREC) Consejo Superior de Investigaciones Cientificas-Universidad de Castilla-La Mancha-Junta de Comunidades de Castilla-La Mancha (CSIC-UCLM-JCCM) Ronda de Toledo s/n 13071 Ciudad RealSpain Seccion de Recursos Cinegeticos y Ganaderos Instituto de Desarrollo Regional (IDR)02071 AlbaceteSpain Departamento de Ciencia y Tecnologia Agroforestal y Genetica ETSIAM Universidad de Castilla-La Mancha(UCLM)02071 AlbaceteSpain

Mater nal effects occur whe n the phe no type of the mother in flue nces that of the young to the detriment of her survival, growth or fitn ess. The in vestment of the mother can be affected by mater nal body condition and/or experience. Trivers-Willard Hypothesis (TWH) and Local Resource Competition Hypothesis (LRCH) are the main hypotheses used to explain bias in birth sex-ratios in mammals, as well as for sex-biased maternal investment. Both hypotheses suggest that a different amount of investment must be expected according to the sex of the young. However, recent studies suggest that these differences are not in quantity but in the strategies: mechanisms and objectives may differ for each sex. We studied how maternal characteristics (age, body mass, body condition, and domi nance status) influence re leva nt aspects of the birth and early growth of the calf (birth date, birth body mass, body mass at weaning, and body condition at weaning) separately for each sex;and how that investment is mediated by milk production and composition (lactose, fat, and protein). One hundred eighty-eight newborns from 75 captive red deer hinds aged from 2 to 19 years were analyzed. The main differential investment observed was related to birth date: when producing a female, hinds give birth earlier in the season only if they have a good body condition;however, when gestating a male it is the older hinds those which deliver earlier. Subsequently, milk production and composition are correlated with birth body mass in female calves, but to weaning body mass in males. Thus, only hind body mass affects the weaning body mass of female calves, compared with age and hind body mass in males. These results suggest that while TWH fits the maternal investment strategy found for male calves, it is LRCH which correlates with the maternal investment patterns observed for females.

关键词： birth date body condition local resources competition hypothesis milk production sex-ratio Trivers-Willard hypothesis

来源：

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

Leaf area index estimated by direct, semi-direct, and indirect methods in European beech and sycamore maple stands

引用

Journal of Forestry Research 2020年第3期31卷 827-836页

作者： Jakub Cerny Pavel Haninec Radek Pokorny The Forestry and Game Management Research Institute Research Station at OpocnoNa Olive 55051773 OpocnoCzech Republic The Department of Silviculture and Forest Establishment Faculty of Forestry and Wood TechnologyMendel UniversityZemedelska 361300 BrnoCzech Republic

Leaf area index(LAI)is one of the most important characteristics of forest stands that affects the fundamentals of tree physiological processes,biomass production,and mechanical *** LAI results obtained by the semi-direct and indirect methods(the needle technique and an LAI-2000 PCA)in three European beech(Fagus sylvatica L.)stands and one sycamore maple(Acer pseudoplatanus L.)stand were compared with LAI estimated by litter traps during the 2013 growing *** LAI was estimated using an LAI-2000 PCA which showed similar trends among the stands and strongly corresponded to phenological phases of deciduous stands in Europe,with the fastest rate of leaf area increment occurring during the first month following bud *** the growing season,maximum stand LAI value was on June 19th and reached 4.5–5.1,and 4.0 in the beech and maple stands,*** needle technique significantly underestimated(p05)LAI on average by 15.1%and 5.8%in the beech and maple stands,*** methods for LAI estimation at the stand level could be applicable in deciduous forest stands(beech,maple)with similar site and stand ***,calibration by direct method is necessary to obtain the required precision.

关键词： Leaf area index Specific leaf area Litter trap Needle technique LAI-2000 PCA

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Screening of phenolic compounds in australian grown grapes and their potential antioxidant activities

引用

Food Bioscience 2022年第3期47卷 544-556页

作者： Gia Toan Vo Ziyao Liu Osbert Chou Biming Zhong Colin J.Barrow Frank R.Dunshea Hafiz A.R.Suleria School of agriculture and Food Faculty of Veterinary and Agricultural SciencesThe University of MelbourneParkvilleVIC3010Australia CAS Key Laboratory of Quantitative Engineering Biology Synthetic Biochemistry CenterShenzhen Institute of Synthetic BiologyShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China Centre for Chemistry and Biotechnology School of Life and Environmental SciencesDeakin UniversityWaurn PondsVIC3217Australia faculty of Biological Sciences The University of LeedsLeedsLS2 9JTUK

Grapes(Vitis Vinifera)are one of the world's most utilised and prized *** are a great source of antioxidants due to the abundance of phenolic *** pulp is the main part of the grape being *** pulp of five Australian grown grapes–Dawn Seedless(DS),Calmeria(CG),Golden Globe(GG),Menindee Seedless(MS),and Thompson Seedless(TS)will be qualitatively and quantitatively analysed for its phenolic composition and antioxidant *** general trend followed:GG>TS>MS>DS>CG,and the phenolic content of the pulp also presented a significant positive correlation with the antioxidant *** revealing the highest levels of TPC(4.31±0.11 mg GAE/g)and TFC(0.48±0.09 mg QE/g)while TS were highest in TTC(0.94±0.12 mg CE/g).Similarly,GG exhibited higher antioxidant capacity in DPPH(5.84±0.17 mg AAE/g),FRAP(4.91±0.14 mg AAE/g),and TAC(6.78±0.12 mg AAE/g),while TS revealed highest radical scavenging ability for ABTS(4.56±0.19 mg AAE/g).The LC-ESI-QTOF-MS/MS tentatively identified 78 phenolic compounds consisting of flavonoids(36),phenolic acids(31),lignans(3),stilbenes(1),and other polyphenols(7)in five grapes *** most abundant fruit-based targeted polyphenols were *** had a higher phenolic concentration in HPLC-PDA quantification,particularly for phenolic acids(gallic acid and chlorogenic acid)and flavonoids(kaempferol).Our study provides relatively adequate information on grape pulp's phenolic content and antioxidant capacity,providing confidence and research prospects to promote grape pulp use in different food,pharmaceutical and supplement industries,and even influencing grape cultivation.

关键词： Australian grown grapes Phenolic compounds LC-ESI-QTOF-MS/MS Antioxidant activity HPLC-PDA

来源：

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

Index of Atmospheric Purity reflects the ecological conditions better than the environmental pollution in the Carpathian forests

引用

Journal of Mountain Science 2020年第11期17卷 2691-2706页

作者： Magdalena TANONA Pawel CZARNOTA Department of Ecology and Environmental Protection University of RzeszówZelwerowicza 4 Street35-601 RzeszówPoland

The Index of Atmospheric Purity(IAP)is a popular tool used for the assessment of air quality in polluted urban areas,on the basis of phytosociological data of epiphytic lichen *** hypothesized that this indicator could also be used in less polluted forest areas to determine the quality of ecological conditions for *** aim of the present study was to verify the use of IAP method in the assessment of environmental pollution,and alternatively for the assessment of general ecological conditions in protected mountain forests of Gorce National Park(Polish Western Carpathians)based on the epiphytic lichen biota associated with Picea *** spatial distribution of IAP values on monitored sites in GNP was compared with:1)spatial distribution of accumulated sulfur,nitrogen,selected heavy metals,and total heavy metals in Hypogymnia physodes thalli in 1993 and 2018(30 sites),2)mean ecological indicator values characterizing species requirements for light(L),substrate reaction(R)and nutrients(N),in 1993,2013 and 2018(33 sites).Generalized linear model and redundancy analysis were performed for disclosing most influencing factors affecting lichen *** study revealed a few negligible relationships between IAP values and accumulation of such elements as Ni,Mn,Cd,and Cr in both monitoring ***,IAP can be useful for the identification of forest areas with a high degree of naturalness.

关键词： Biomonitoring Lichens Forest ecology Norway spruce Ecological indices Environmental pollution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chromosome-scale genome assembly of Prunus pusilliflora provides novel insights into genome evolution, disease resistance, and dormancy release in Cerasus L.

引用

Horticulture Research 2023年第5期10卷 220-235页

作者： Songtao Jiu Baozheng Chen Xiao Dong Zhengxin Lv Yuxuan Wang Chunjin Yin Yan Xu Sen Zhang Jijun Zhu Jiyuan Wang Xunju Liu Wanxia Sun Guoqian Yang Meng Li Shufeng Li Zhuo Zhang Ruie Liu Lei Wang Muhammad Aamir Manzoor Quero-García José Shiping Wang Yahui Lei Ling Yang Elisabeth Dirlewanger Yang Dong Caixi Zhang Department of Plant Science School of Agriculture and BiologyShanghai Jiao Tong UniversityShanghai200240P.R.China College of Food Science and Technology Yunnan Agricultural UniversityKunmingYunnan Province650201P.R.China Dali Bai Autonomous Prefecture Academy of Agricultural Sciences and Extension DaliYunnan Province671600P.R.China Shanghai Botanical Garden Shanghai200231P.R.China College of Biology and the Environment Nanjing Forestry UniversityNanjingJiangsu Province200037P.R.China INRAe UMR 1332 de Biologie du Fruit et Pathologie33140 Villenave d’OrnonFrance

Prunus pusilliflora is a wild cherry germplasm resource distributed mainly in Southwest *** its ornamental and economic value,a high-quality assembled *** genome is unavailable,hindering our understanding of its genetic background,population diversity,and evolutionary ***,we de novo assembled a chromosome-scale *** genome using Oxford Nanopore,Illumina,and chromosome conformation capture *** assembled genome size was 309.62 Mb,with 76 scaffolds anchored to eight *** predicted 33035 protein-coding genes,functionally annotated 98.27%of them,and identified repetitive sequences covering 49.08%of the *** found that *** is closely related to Prunus serrulata and Prunus yedoensis,having diverged from them∼41.8 million years ago.A comparative genomic analysis revealed that *** has 643 expanded and 1128 contracted gene ***,we found that *** is more resistant to Colletotrichum viniferum,Phytophthora capsici,and Pseudomonas syringae ***(Pst)DC3000 infections than cultivated Prunus *** also has considerably more nucleotide-binding site-type resistance gene analogs than ***,which explains its stronger disease *** cytochrome P450 and WRKY families of 263 and 61 proteins were divided into 42 and 8 subfamilies respectively in ***,81 MADS-box genes were identified in ***,accompanying expansions of the SVP and AGL15 subfamilies and loss of the TM3 *** assembly of a high-quality *** genome will be valuable for further research on cherries and molecular breeding.

关键词： Prunus resistance release

来源：

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

Ethylene Production and 1-Aminocyclopropane-l-Carboxylate （ACC） Synthase Gene Expression in Tomato （ L ycopsicon esculentum Mill.） Leaves Under Enhanced UV-B Radiation

引用

Journal of Integrative Plant Biology 2006年第10期48卷 1190-1196页

作者： Lizhe An Xiaofeng Xu Hongguan Tang Manxiao Zhang Zongdong HOU Yanhong Liu Zhiguang Zhao Huyuan Feng Shijian Xu Xunling Wang Key Laboratory of Arid and Grassland Ecology of Ministry of Education Lanzhou University Lanzhou 730000 China Cold and Arid Regions Environmental and Engineering Research Institute the Chinese Academy of Sciences Lanzhou 730000 China

Tomato （Lycopslcon esculentum Mill.） plants grown in a greenhouse were irradiated with two different levels of UV-B, namely 8.82 （T1） and 12.6 kJ/m^2 per day （T2）. Ethylene production, 1-aminocyclopropane-1-carboxylate （ACC） content, 1-（malonylamino） cyclopvopane-1-carboxylic acid （MACC） content, gene expression of ACC aynthase （EC 4.***.1.14）, and ACC oxidase activity in tomato leaves were determined. The results Indicated that ACC content, the activity of ACC synthase and ACC oxidase, and ethylene production Increased continuously under low doses of UV-B radiation, whereas at high doses of radiation these parameters Increased during the first 12 d and then started to decrease. The MACC content increased continuously over 18 d under both doses of UV-B irradiation. The changes in ACC content, ACC synthaae activity, ACC oxidase activity, the transcriptional level of the ACC synthase gene, and ethylene production were consistent with each other, suggesting that ACC synthase was the key enzyme in ethylene biosynthesis and that ethylene production in tomato leaf tissues under UV-B radiation could be regulated by the expression of the ACC synthase gene. The results also indicate that the change in ethylene metabolism may be an adaptive mechanism to enhanced UV-B radiation.

关键词： enhanced UV-B radiation ethylene production gene expression of 1-aminocyclopropane-l-carboxylate (ACC) synthase Lycopsicon esculentum

来源：

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

Effects of Dry-Milling and Wet-Milling on Chemical, Physical and Gelatinization Properties of Rice Flour

引用

Rice science 2016年第5期23卷 274-281页

作者： Jitranut LEEWATCHARARONGJAROEN Jirarat ANUNTAGOOL Department of Food Technology Faculty of Science Chulalongkorn University

Rice flour from nine varieties, subjected to dry- and wet-milling processes, was determined for its physical and chemical properties. The results revealed that milling method had an effect on properties of flour. Wet-milling process resulted in flour with significantly lower protein and ash contents and higher carbohydrate content. Wet-milled flour also tended to have lower lipid content and higher amylose content. In addition, wet-milled rice flour contained granules with smaller average size compared to dry-milled samples. Swelling power at 90℃ of wet-milled samples was higher while solubility was significantly lower than those of dry-milled flour. Dry milling process caused the destruction of the crystalline structure and yielded flour with lower crystallinity compared to wet-milling process, which resulted in significantly lower gelatinization enthalpy.

关键词： rice flour physicochemical property crystallinity amylose content milling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Deep learning for smart agriculture:Concepts,tools,applications,and opportunities

引用

International Journal of Agricultural and Biological Engineering 2018年第4期11卷 32-44页

作者： Nanyang Zhu Xu Liu Ziqian Liu Kai Hu Yingkuan Wang Jinglu Tan Min Huang Qibing Zhu Xunsheng Ji Yongnian Jiang Ya Guo Key Laboratory of Advanced Process Control for Light Industry Ministry of EducationJiangnan UniversityWuxi 214122China School of Internet of Things Jiangnan UniversityWuxi 214122China Chinese Academy of Agricultural Engineering Beijing 100125China Department of Bioengineering University of MissouriColumbiaMO 65211USA Jiangsu Zhongnong IoT Technology Co. LTDYixing 214200China

In recent years,Deep Learning(DL),such as the algorithms of Convolutional Neural Networks(CNN),Recurrent Neural Networks(RNN)and Generative Adversarial Networks(GAN),has been widely studied and applied in various fields including *** in the fields of agriculture often use software frameworks without sufficiently examining the ideas and mechanisms of a *** article provides a concise summary of major DL algorithms,including concepts,limitations,implementation,training processes,and example codes,to help researchers in agriculture to gain a holistic picture of major DL techniques *** on DL applications in agriculture is summarized and analyzed,and future opportunities are discussed in this paper,which is expected to help researchers in agriculture to better understand DL algorithms and learn major DL techniques quickly,and further to facilitate data analysis,enhance related research in agriculture,and thus promote DL applications effectively.

关键词： deep learning smart agriculture neural network convolutional neural networks recurrent neural networks generative adversarial networks artificial intelligence image processing pattern recognition

来源：

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

Prediction of dissolved oxygen in a fishery pond based on gated recurrent unit (GRU)

引用

Information Processing in agriculture 2021年第1期8卷 185-193页

作者： Wuyan Li Hao Wu Nanyang Zhu Yongnian Jiang Jinglu Tan Ya Guo Key Laboratory of Advanced Process Control for Light Industry(Ministry of Education) School of Internet of Things EngineeringJiangnan UniversityWuxi 214122China Jiangsu Internet Agricultural Development Center Nanjing 210017China Jiangsu Zhongnong IoT Technology Co. LTDYixing 214200China University of Missouri ColumbiaMO 65211USA

Dissolved oxygen(DO),an important water quality indicator in aquaculture,affects the survival rate of aquatic creatures and the yield of aquatic ***,it is important to predict DO in fishery ponds for applying artificial aeration with low energy and ***,deep learning models,such as recurrent neural network(RNN),long short-term memory(LSTM),and gated recurrent unit(GRU),are often used to predict the trend of time series,but it is unclear which one of them is more suitable for prediction of DO in fishery *** this work,the RNN model,LSTM model,and GRU model were used to build three DO predicting *** performance of the three models were compared by mean absolute error(MAE),mean square error(MSE),mean absolute percentage error(MAPE),and the coefficient of determination(R2).The performance of RNN is worse result than LSTM and *** four evaluation indicators of GRU are 0.450 mg/L,0.411,0.054,and 0.994,and the four indicators of LSTM are 0.407 mg/L,0.294,0.059,and 0.970,which shows that the performance of GRU is similar to LSTM,but the time cost and number of parameters used for GRU is much lower than *** is concluded that the GRU has overall better performance and can be applied to practical applications.

关键词： Dissolved oxygen RNN model LSTM model GRU model

来源：

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

Hydrodynamic parameters in a flood impacted boulder block ramp： Krzczonówka mountain stream, Polish Carpathians

引用

Journal of Mountain Science 2018年第11期15卷 2335-2346页

作者： RADECKI-PAWLIK Artur PLESINSKI Karol RADECKI-PAWLIK Bartosz KUBON Piotr MANSON Russell Institute of Structural Mechanics Cracow University of Technology Krakow 31-155 Poland Department of Hydraulics Engineering and Geotechnics University of Agricultural in Krakow Krakow 30-059Poland School of Natural Sciences and Mathematics Stockton University Galloway NJ 08205-9441 USA

Boulder block ramps are river engineering structures used to stabilise river beds. Block ramps provide a semi-natural and aesthetically pleasing solution to certain river engineering problems in mountain streams. When constructing block ramps,one can use the dissipative behaviour of large macroroughness elements randomly placed on the river bed to enhance fish migration in an upstream direction thus, in this sense, meeting the requirements of the EU Water Framework Directive. Block ramps are often designed and constructed to replace damaged drop hydraulic structures in the channels of mountain streams. This paper investigates the resilience of a particular block ramp placed in the Krzczonówka stream(Polish Carpathians) in terms of the engineering design function and its durability against damaging. A hydrodynamic analysis of a block ramp is presented before and after a flood event that changed the configuration of the blocks. The seminatural unstructured hydraulic structure was built on the Krzczonowka stream to protect gas pipes which are located beneath it. As a result of several floods, the boulder block chute described in this paper was damaged, and some boulders were dislodged and transported downstream. Our post-flood investigations of bathymetry and velocity revealed that even damaged boulder blocks, removed from the chute and displaced downstream of the structure, still provide significant energy dissipation of the flowing water. The novel of our paper is for the first time showing very detailed analysis of unstructured block ramp hydrodynamics parameters done in the *** the novel finding of our investigations shows that before and after the flood event the unstructured block ramp structure, is still fish friendly in terms of hydrodynamics.

关键词： Boulder ramp Mountain stream Hydrodynamic Ramp chute

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：