检索结果-南通市图书馆

Fur glowing under ultraviolet:in situ analysis of porphyrin accumulation in the skin appendages of mammals

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2023年第1期18卷 15-26页

作者： Séverine L.D.TOUSSAINT Jasper PONSTEIN Mathieu THOURY Rémi MÉTIVIER Daniela c.KALTHOFF Benoît HABERMEYER Roger GUILARD Steffen BOcK Peter MORTENSEN Sverre SANDBERG Pierre GUERIAU Eli AMSON AG Vergleichende Zoologie Institut für BiologieHumboldt Universität zu BerlinBerlinGermany Museum für Naturkunde Berlin Leibniz Institute for Evolution and Biodiversity ScienceBerlinGermany AG paläobiologie und Evolution Institut für BiologieHumboldt Universität zu BerlinBerlinGermany IPANEMA CNRSministère de la CultureUVSQMNHNUSR3461UniversitéParis-SaclayGif-sur-YvetteFrance UniversitéParis-Saclay ENS Paris-SaclayCNRSPPSMGif-sur-YvetteFrance Department of Zoology Swedish Museum of Natural HistoryStockholmSweden Porphychem SAS DijonFrance IcMUB UMR CNRS 6302Universitéde Bourgogne Franche-ComtéFrance Norwegian Porphyria centre(NAPOS) Haukeland University HospitalNorwegian Organization for Quality Improvement of Laboratory Examinations(Noklus)and Department of Global Public Health and Primary CareFaculty of MedicineUniversity of BergenNorway Institute of Earth Sciences University of LausanneLausanneSwitzerland Staatliches Museum für Naturkunde Stuttgart StuttgartGermany

Examples of photoluminescence(PL)are being reported with increasing frequency in a wide range of organisms from diverse ***,the chemical basis of this PL remains poorly deﬁned,and our understanding of its potential ecological function is still superﬁ*** mammals,recent analyses have identiﬁed free-base por-phyrins as the compounds responsible for the reddish ultraviolet-induced photoluminescence(UV-PL)observed in the pelage of springhares and ***,the localization of the pigments within the hair largely remains to be ***,we use photoluminescence multispectral imaging emission and excitation spec-troscopy to detect,map,and characterize porphyrinic compounds in skin appendages in *** also document new cases of mammalian UV-PL caused by free-base porphyrins in distantly related *** distribution of the UV-PL is strongly suggestive of an endogenous origin of the porphyrinic *** argue that reddish UV-PL is predominantly observed in crepuscular and nocturnal mammals because porphyrins are ***-sequently,this phenomenon may not have a speciﬁc function in intra-or interspeciﬁc communication but rather represents a byproduct of potentially widespread physiological processes.

关键词： in situ analysis mammal multispectral imaging porphyrin UV photoluminescence

Implementing physically active learning:Future directions for research,policy,and practice

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

Journal of Sport and Health Science 2020年第1期9卷 41-49,F0003页

作者： Andy Daly-Smith Thomas Quarmby Victoria S.J.Archbold Ash c.Routen Jade L.Morris catherine Gammon John B.Bartholomew Geir Kare Resaland Bryn Llewellyn Richard Allman Henry Dorling School of Sport Leeds Beckett UniversityLeedsLS63QSUK School of Sport Exercise and Health SciencesLoughborough UniversityE152GZUK School of Health Promotion and Human Performance Eastern Michigan UniversityYpsilantiMI 48197USA centre for Diet and Activity Research MRC Epidemiology UnitUniversity of CambridgeCambridgeCB21TNUK Department of Kinesiology and Health Education The University of Texas at AustinAustinTX 78705USA center for Physically Active Learning Faculty of EducationArts and SportsWestern Norway University of Applied SciencesSogndal5020 BergenNorway Tagtiv8 Ltd and Move&Learn LeedsWF27BSUK School of Sport Health and Social ScienceSolent UniversitySouthamptonSO 14 ORTUK

Purpose:To identify co-produced multi-stakeholder perspectives important for successful widespread physically active learning(pal) adoption and ***:A total of 35 stakeholders(policymakers n=9;commercial education sector,n=8;teachers,n=3;researchers,n=15) attended a design thinking pal *** formed 5 multi-disciplinary groups with at least 1 representative from each stakeholder *** group,facilitated by a researcher,undertook 2 tasks:(1) using Post-it Notes,the following question was answered:within the school day,what are the opportunities for learning combined with movement?and(2) structured as a washing-line task,the following question was answered:how can we establish pal as the norm?All discussions were audio-recorded and *** analyses were conducted by 4 *** the analyses were complete,the main themes and subthemes were assigned to 4 predetermined categories:(1) pal design and implementation,(2) priorities for practice,(3) priorities for policy,and(4) priorities for ***:The following were the main themes for pal implementation:opportunities for pal within the school day,delivery environments,learning approaches,and the intensity of *** main themes for the priorities for practice included teacher confidence and competence,resources to support delivery,and community of *** main themes for the policy for priorities included self-governance,the Office for Standards in Education,children’s Services,and Skill,policy investment in initial teacher training,and curriculum *** main themes for the research priorities included establishing a strong evidence base,school-based pal implementation,and a whole-systems ***:The present study is the first to identify pal implementation factors using a combined multi-stakeholder *** achieve wider pal adoption and implementation,future interventions should be evidence based and address implementation factors

关键词： children Physical activity Physically active learning Policy School

<i>Azospirillum</i>Growth Promotion Is Related to changes in Ferulate and Dehydrodiferulate contents in cell Wall of Inoculated cucumber Seedlings Hypocotyls

在线全文

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2015年第10期6卷 1650-1661页

作者： claudia c. Dal Lago cecilia M. creus M. Alejandra Pereyra Laboratorio de Bioquímica Vegetal y Microbiana Unidad Integrada Balcarce Facultad de Ciencias Agrarias Universidad Nacional de Mar del Plata EEA Balcarce INTA Balcarce Argentina

Azospirillum brasilense is a well known plant growth-promoting rhizobacterium. Plant cell growth is constrained by the primary cell wall (cW) which contains polysaccharide-bound hydroxycinammic acids (HcAs). They derive from phenylpropanoid metabolism, which first step is the reaction catalyzed by phenylalanine ammonia-lyase (pal;Ec 4.***.1.24). Also cW peroxidases (FAPOD;Ec 1.***.1.7) play a key role in the stiffening of the cW, and in the cessation of cell elongation. Knowledge of the biochemical effects the bacteria could elicit into plant cW and how these responses could change the hypocotyl physiology still remains scarce. The objective of this work was to unravel the effects of A. brasilense Sp245 inoculation on HcAs of the primary cW in apical and basal segments of cucumber seedlings hypocotyls. Azospirillum inoculation increased hypocotyls’ length. Transferulate and p-coumarate were the major HcAs. Dimmers were detected only in the basal region of 13- and 15-d-old hypocotyls. The ratio t-ferulate/dimmer (an inverse index of cW cross-linking) was five times higher in inoculated seedlings. Enzyme activities determined were not directly involved in HcAs content changes. It was previously reported that the cW was a target for A. brasilense growth promotion. This work corroborates that the phenolics, FA, DFA, and p-coumarate bound to the cW are also involved in Azospirillum plant growth promoting strategies.

关键词： Azospirillum Plant Growth Promotion Plant cell Wall Hydroxycinammic Acids

The first shrimp preserved in mid-cretaceous Kachin amber:systematics,palaeoecology,and taphonomy

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

Science Bulletin 2021年第17期66卷 1723-1726,M0003页

作者： Lida Xing Yu Liu Ryan c.McKellar Javier Luque Gang Li Yanping Wang Qiru Yi Rui Sun Enze Wang Denis Audo State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesBeijing 100083China School of the Earth Sciences and Resources China University of GeosciencesBeijing 100083China Yunnan Key Laboratory for palaeobiology Institute of PalaeontologyYunnan UniversityKunming 650500China MEc International Joint Laboratory for palaeobiology and palaeoenvironment Yunnan UniversityKunming 650500China Royal Saskatchewan Museum ReginaSaskatchewan S4P 4W7Canada Biology Department University of ReginaReginaSaskatchewan S4S 0A2Canada Department of Ecology and Evolutionary Biology University of KansasLawrence KS 66045USA Museum of comparative Zoology Department of Organismic and Evolutionary BiologyHarvard UniversityCambridge MA 02138USA Department of Earth&Planetary Sciences Yale UniversityNew Haven CT 06520-8109USA Smithsonian Tropical Research Institute Balboa-Ancon 0843-03092Panama Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of chinese Academy of Sciences Beijing 100049China State Key Laboratory of palaeobiology and Stratigraphy Center for Excellence in Life and PaleoenvironmentNanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China centre de Recherche en paléontologie Sorbonne UniversitéMuséum national d’Histoire naturelleParis F-75005France

Amber from Kachin,Myanmar offers a unique window into mid-cretaceous ecosystems because it provides large sample sets that span a wide range of taxa preserved in exquisite detail at approximately 99 Ma[1].A fringe benefit of such extensive sampling is that inclusions rarely captured in other amber deposits are represented in Kachin amber—even subaquatic *** studies have documented inclusions of fully marine groups,such as ammonites[2]and bivalves[3].

关键词：琥珀古生态学虾类海洋环境菊石类同步辐射系统学动物化石

在线全文

学校读者我要写书评

暂无评论

电视接收机中的数字信号处理

电讯技术 1989年第3期29卷 60-68,59页

作者： M.J.J.c.安纳加恩王丕

本文从全电视信号的频谱特征出发,讨论了各种数字梳状滤波器的分析设计。这些数字梳状滤波器,使亮度和色度信号达到了最大限度的分离,从而大大地降低了亮—色交调失真及相互串扰,提高了电视接收机的观看效果。文章在最后给出了进一步彩... 详细信息

本文从全电视信号的频谱特征出发,讨论了各种数字梳状滤波器的分析设计。这些数字梳状滤波器,使亮度和色度信号达到了最大限度的分离,从而大大地降低了亮—色交调失真及相互串扰,提高了电视接收机的观看效果。文章在最后给出了进一步彩电观看效果的方法,如降低大面积场间闪烁和局部行间闪烁。总之,所有这些对未来视频系统的分析设计提供了不少启迪和借鉴。

关键词：电视机数字信号处理

高磷鲕状赤铁矿深度还原过程中磷灰石还原热力学研究

在线全文

学校读者我要写书评

暂无评论

矿产保护与利用 2018年第2期38卷 52-56,62页

作者：赵立鹏李国峰张涛杨含蓄白丽梅华北理工大学矿业工程学院河北唐山063210

某高磷鲕状赤铁矿磷含量为1.31%,主要以磷灰石的形式存在。采用热力学分析、模拟计算及试验验证的方法,对该矿石深度还原过程中磷灰石的还原热力学行为进行了研究。结果显示,在预定的深度还原温度范围内,矿石中的磷灰石可以被还原;杂质... 详细信息

某高磷鲕状赤铁矿磷含量为1.31%,主要以磷灰石的形式存在。采用热力学分析、模拟计算及试验验证的方法,对该矿石深度还原过程中磷灰石的还原热力学行为进行了研究。结果显示,在预定的深度还原温度范围内,矿石中的磷灰石可以被还原;杂质氧化物参与反应可降低起始反应温度;升高还原温度、增大c/O摩尔比和延长反应时间均有利于磷灰石的还原,在还原温度1 548 K、还原时间50 min、c/O摩尔比2.0的条件下,磷灰石的还原度达到78.57%。上述研究内容对高磷鲕状赤铁矿深度还原过程中磷元素迁移走向的选择有指导意义。

关键词：鲕状赤铁矿磷灰石深度还原热力学

在线全文

学校读者我要写书评

暂无评论

长期存活肿瘤患儿不良预后的医学评估

美国医学会杂志（中文版） 2008年第3期27卷 137-147页

作者： Maud M. Geenen, MD Mathilde c. cardous-Ubbink, MSc Leontien c. M. Kremer, MD, PhD cor van den Bos, MD, PhD Helena J. H. van der pal, MD Richard c. Heinen, MSc Monique. M. Jaspers, PhD, MSc caro c. E. Koning, MD, PhD Foppe Oldenburger, MD Nelia E. Langeveld, PhD, RN Augustinus A. M. Hart, MSc Piet J. M. Bakker, MD, PhD Huib N. caron, MD, PhD Flora E. van Leeuwen, PhD, MSc 张成海(译) 武爱文(译) 徐光炜(校) Late Effects Study Group and Outpatient clinic/Polikliniek Late Effecten Kindertumoren(PLEK) Emma children's Hospital/Academic Medical center: Departments of Medical Oneology Department of Pediatric Oncology Academic Medical center:and Departments of Radiotherapy Netherlands cancer Institute Amsterdamthe Netherlands Late Effects Study Group and Outpatient clinic/Polikliniek Late Effecten Kindertumoren(PLEK) Department of Pediatric Oncology Epidemiology Netherlands cancer Institute Amsterdamthe Netherlands Late Effects Study Group and Outpatient clinic/Polikliniek Late Effecten Kindertumoren(PLEK) Medical Informatics Netherlands cancer Institute Amsterdamthe Netherlands Late Effects Study Group and Outpatient clinic/Polikliniek Late Effecten Kindertumoren(PLEK) Radiotherapy Netherlands cancer Institute Amsterdamthe Netherlands Radiotherapy Netherlands cancer Institute Amsterdamthe Netherlands

背景：癌症患儿存活改善与多种治疗相关并发症相伴。然而，绝大多数有关癌症儿童生存率的研究仅局限于单一的远期效应。目的：在一个有完整的长期随访资料的大型儿童癌症生存队列中对癌症长期存活的不良预后（临床或亚临床病症）的总负... 详细信息

背景：癌症患儿存活改善与多种治疗相关并发症相伴。然而，绝大多数有关癌症儿童生存率的研究仅局限于单一的远期效应。目的：在一个有完整的长期随访资料的大型儿童癌症生存队列中对癌症长期存活的不良预后（临床或亚临床病症）的总负荷进行评估。设计、地点及人群：于1362例已生存5年的儿童癌症患者中进行回顾性队列研究。患儿1966至1996年在荷兰一家医疗机构接受治疗。所有生存者均被邀请到晚期效应诊所进行不良事件医学评估。2004年1月以前发生的不良事件依据标准方式进行严重度分级。主要观测指标：随访结束时治疗别不良事件（依据严重性）的发生率以及各种治疗相关疾病高度或严重负荷（危险度92或危及生命或致残的不良事件≥1个）的相对危险度。结果：94．3％的生存者完成了随访（中位随访时间17年）。随访结束时中位年龄为24、4岁。大约75％的生存者有1个或更多不良事件，24．6％发生5个或以上不良事件。而且，40％的生存者至少有1个严重、危及生命或致残的不良事件。在接受单纯放疗的生存者中，55％的患者观察到高度或严重不良事件负荷。接受单纯化疗的生存者发生率为15％，而单纯手术治疗的存活者相应发生率则为25％（校正后相对危险分别为2．18[95％可信区间，1．62—2．95]和0．65[95％可信区间，0．46—0．90]）。不良事件高度或严重负荷最常见于骨肿瘤生存者（64％），较少见于白血病或Wilms瘤生存者（12％）。结论：在成年时，很大一部分儿童癌症生存者都存在高度或严重疾病负荷，尤其是在放疗后。这强调了对儿童癌症生存者根据危险分层进行终生医学监视的必要性。

关键词：医学评估肿瘤患儿长期存活不良预后单纯手术治疗癌症生存者相对危险度不良事件

D-和D2-MAc/packet——完全在基带内传送的MAc制电视标准

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

广播与电视技术 1987年第5期 51-61页

作者： c.Dosch 潘振昌

D-和D2MAc/packet是在c-MAc/Packet基础上发展起来、原本是想用于电缆电视系统的。欧广联最近公布了用于直播卫星的D2-MAc/packet传送技术标准。c-MAc/packet制的信息可以在宽带电缆通道(至少10.5MHz)中以D-MAc/packet的残留边带调幅方... 详细信息

D-和D2MAc/packet是在c-MAc/Packet基础上发展起来、原本是想用于电缆电视系统的。欧广联最近公布了用于直播卫星的D2-MAc/packet传送技术标准。c-MAc/packet制的信息可以在宽带电缆通道(至少10.5MHz)中以D-MAc/packet的残留边带调幅方式传送。而在窄带电缆通道(至少7MHz)中也可将c-MAc/packet的码转换成D2-MAc/packet传送,不过得削减一半声音/数据信息,而且由于残留边带的带宽限制,图像的水平分解力也有所降低。与c-方式不同,D-和D2-MAc/packet中数字的声音/数据群不是二进制,而是双值二进制编码,然后将这个双值二进制信号插入到基带信号中去共同调制载波。就视频规格本身(MAc)来说,这三种MAc/packet之间没有区别,但就D2来说,使今后有可能扩大图像宽高比的方法,受到不能缩短数据串的限制。联邦德国政府和法国政府于1985年6月达成协议,同意在直播卫星TV-SAT和TDF-1中直接使用D2-MAc/packet,而不经过pal/SEcAM的中间过渡。因此D2-MAc/packet的解码器必须在1986年底之前提供使用,这第一批解码器还不能完全符合欧广联的技术标准,其中与法国约定的起码的技术标准见文后附录(未译出,见原文)。

关键词： MAc 图像电缆残留边带 D2-MAc/packet 基带

composition and structure of vegetation between southern glacial refugia and steppic areas of southwestern Europe

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Composition and structure of vegetation between southern gla...