检索结果-南通市图书馆

Succinite, Baltic Amber:A Chemical Masterpiece of Nature

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

宝石和宝石学杂志（中英文） 2023年第4期25卷 69-87页

作者： Ewa.wagner-Wysiecka Department of Chemistry and Technology of Functional Materials Faculty of ChemistryGdańsk University of TechnologyNarutowicza Street 11/1280-233 GdańskPoland Advanced Materials Center Faculty of ChemistryGdańsk University of TechnologyNarutowicza Street 11/1280-233 GdańskPoland International Amber Association Warzywnicza Street 180-838 GdańskPoland

Succinite,Baltic amber,is one of the most appreciated fossil *** beauty has fascinated people since prehistoric *** is a substance,and also gemstone,whose uniqueness is due to its compelling,though still not fully understood,physicochemical *** this article,some facts about the physical and chemical properties of succinite in order to find an answer for questions about the unique properties of this resin,such as color,transparency,texture etc.,are *** properties are among the factors that determine the choice of Baltic amber as a *** known properties of succinite,but also some less obvious features,have been linked to the organic and inorganic chemical composition and structural factors,including the sophisticated supramolecular structure masterfully created by *** of the properties of succinite used as a jewelry stone are discussed as a reflection of changes in its physicochemical *** this light,some methods that can be used to identify succinite(i.e.,infrared spectroscopy and nuclear magnetic resonance spectroscopy)and their relevance to the classification of fossil resins are briefly *** article highlights an important point:only by understanding the chemical and physical nature of the material we able to identify,modify and effectively use the goods that have been given to us by mother nature.

关键词： Baltic amber succinite chemical composition property

Nanoparticles for targeted cancer radiotherapy

在线全文

学校读者我要写书评

暂无评论

Nano Research 2020年第11期13卷 2887-2897页

作者： roger M.Pallares Rebecca J.Abergel Chemical Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA94720USA Department of Nuclear Engineering University of CaliforniaBerkeleyCA94720USA

Radiotherapy,where ionizing radiation is locally delivered either through an external beam or by surgically implanting radionuclide-based seeds in the tumor,is one of the gold standard treatments for *** to the non-selective nature of radiation,healthy tissue surrounding the cancerous region is usually affected by the ***,new strategies,including targeted alpha therapy,are being studied to improve the selectivity of the treatment and minimize side *** challenges,however,limit the current development of targeted radiotherapy,such as the functionalization of the therapeutic agent with targeting vectors and controlling the release of recoiling *** offer unique opportunities as drug delivery vehicles,since they are biocompatible,enhance the cellular uptake of drugs,and are easily functionalized with targeting *** this review,we examine how nanoparticles can be used for targeted radiotherapy,either as sensitizers of external beams or as delivery vehicles for therapeutic *** describe the clinical relevance of different types of nanoparticles,followed by an analysis of how these nanoconstructs can solve some of the main limitations of conventional ***,we critically discuss the current situation of nanoparticle-based radiotherapy in clinical settings and challenges that need to be overcome in the future for further development of the field.

关键词： radiotherapy targeted cancer radiotherapy nanoparticles cancer targeted alpha therapy external beam

Spatial variance and assessment of nitrogen dioxide pollution in major cities of Pakistan along N5-Highway

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 Environmental Sciences 2016年第5期28卷 4-14页

作者： Yasir Shabbir Muhammad Fahim Khokhar Reza Shaiganfar Thomas wagner Institute of Environmental Sciences and Engineering (IESE) National University of Sciences and Technology (NUST)Islamabad Pakistan Satellite Remote Sensing Group Max-Planck-Institute for Chemistry

This paper discusses the findings of the first car MAX-DOAS（multi-axis differential optical absorption spectroscopy） field campaign（300 km long） along the National Highway-05（N5-Highway） of Pakistan conducted on 13 and 14 November, 2012. The main objective of the field campaign was to assess the spatial distribution of tropospheric nitrogen dioxide（NO_2）columns and corresponding concentrations along the N5-Highway from Islamabad to *** identification of NO_2 revealed that the concentrations were higher within major cities along the highway. The highest NO_2 vertical column densities（NO_2VCDs） were found around two major cities of Rawalpindi and Lahore. This study also presents a comparison of NO_2 VCDs measured by the ozone monitoring instrument（OMI） and car MAX-DOAS observations. The comparison revealed similar spatial distribution of the NO_2 columns with both car MAX-DOAS and satellite observations, but the car MAX-DOAS observations show much more spatial details. Maximum NO_2 VCD retrieved from car MAX-DOAS observations was up to an order of magnitude larger than the OMI observations in urban areas.

关键词： Car MAX-DOAS Satellite remote sensing Nitrogen dioxide N5-Highway Pakistan National Environmental Quality Standards

Influence of organic and inorganic properties of coal-shale on spontaneous combustion liability

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2019年第6期29卷 851-857页

作者： M.Onifade B.Genc N.wagner The School of Mining Engineering University of the WitwatersrandJohannesburg 2050South Africa Department of Geology University of JohannesburgJohannesburg 2092South Africa

Coal and coal-shale undergo low-temperature oxidation when exposed to air,potentially leading to spontaneous ***-shale found in association with coal seams vary considerably in their intrinsic properties and spontaneous combustion liability *** coal-shale samples collected from four different coal mines in Witbank Coalfield,South Africa,were experimentally *** influence of coal-shale intrinsic properties and spontaneous combustion liability indices(determined by the WitsEhac Index and the Wits-CT Index)were *** liability indices indicate relationships with the intrinsic factors and thus,identifying the major intrinsic factors affecting liability toward spontaneous combustion in these coal-shale *** XRF analysis indicated that the coal-shale samples are rich in Si O2,Al2O3 and Fe2O3,while the XRD showed that same coal-shale samples are generally dominated with kaolinite and *** coal-shale occurred in association with medium Rank C bituminous coal and contained varying proportion of *** Wits-Ehac Index was unable to reliably determine liability indices of some coal-shale samples,and hence the Wits-CT Index was *** results obtained from the characterisation tests may be used as a tool to predict the spontaneous combustion liability in carbonaceous material and may serve as a reference when comparing coal-shale from different coal mines.

关键词： Wits-Ehac Index Wits-CT Inde Witbank Coalfield and self-heating

Functional neuroanatomy in panic disorder:Status quo of the research

在线全文

学校读者我要写书评

暂无评论

World Journal of Psychiatry 2017年第1期7卷 12-33页

作者： Thomas Sobanski Gerd wagner Department of Psychiatry Psychotherapyand Psychosomatic MedicineThueringen-Kliniken GmbH Psychiatric Brain and Body Research Group Jena Department of Psychiatry and PsychotherapyJena University Hospital

AIM To provide an overview of the current research in the functional neuroanatomy of panic *** Panic disorder(PD) is a frequent psychiatric disease. Gorman et al(1989; 2000) proposed a comprehensive neuroanatomical model of PD, which suggested that fear-and anxiety-related responses are mediated by a so-called "fear network" which is centered in the amygdala and includes the hippocampus, thalamus, hypothalamus, periaqueductal gray region, locus coeruleus and other brainstem sites. We performed a systematic search by the electronic database PubMed. Thereby, the main focus was laid on recent neurofunctional, neurostructural, and neurochemical studies(from the period between January 2012 and April 2016). Within this frame, special attention was given to the emerging field of imaging genetics. RESULTS We noted that many neuroimaging studies have reinforced the role of the "fear network" regions in the pathophysiology of panic disorder. However, recent functional studies suggest abnormal activation mainly in an extended fear network comprising brainstem, anterior and midcingulate cortex(ACC and MCC), insula, and lateral as well as medial parts of the prefrontal cortex. Interestingly, differences in the amygdala activation were not as consistently reported as one would predict from the hypothesis of Gorman et al(2000). Indeed, amygdala hyperactivation seems to strongly depend on stimuli and experimental paradigms, sample heterogeneity and size, as well as on limitations of neuroimaging techniques. Advanced neurochemical studies have substantiated the major role of serotonergic, noradrenergic and glutamatergic neurotransmission in the pathophysiology of PD. However, alterations of GABAergic function in PD are still a matter of debate and also their specificity remains questionable. A promising new research approach is "imaging genetics". Imaging genetic studies are designed to evaluate the impact of genetic variations(polymorphisms) on cerebral function in reg

关键词： Panic disorder Anterior cingulate cortex Amygdala Insula Functional magnetic resonance imaging Diffusion tensor imaging Voxel-based morphometry Imaging genetics Serotonin Noradrenaline

Is it time to abandon the biological species concept? No

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

National Science Review 2020年第8期7卷 1400-1401页

作者： roger K.Butlin Sean Stankowski Department of Animal and Plant Sciences University of Sheffield Department of Marine Sciences University of Gothenburg

The Oxford English Dictionary defines a concept as, ‘an idea of a class of objects, a general notion’. It follows from this definition that a concept cannot be rejected in the way that a hypothesis might be rejected if its predictions are inconsistent with observations. Instead, a concept must be judged by its heuristic value:does it help in making sense of the natural world?

关键词：

New Food Safety Law of China and the special issue on food safety in China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2015年第11期14卷 2136-2141页

作者： Shu Geng LIU Xu roger Beachy Journal of Integrative Agriculture Chinese Academy of Agricultural Sciences Sino-US Joint Food Safety Research Center Northwest A&F University Chinese Academy of Engineering World Food Center University of California

1. IntroductionThere have been a number of serious incidents of compro- mised food safety in China in recent years. To list a few, these include： a Salmonella outbreak, the use of horse- meat in burgers, the illegal use of phthalates as a clouding agent, the contamination of formula milk by melamine, the meat scandal of Shanghai Husi Food Company which sold reprocessed stale meat to many fast food chains includ- ing McDonald＇s, Burger King, and KFC across theworld,

关键词： New Food Safety Law of China and the special issue on food safety in China FSMA

Transplantation of primary and reversibly immortalized human liver cells and other gene therapies in acute liver failure and decompensated chronic liver disease

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2000年第5期6卷 636-642页

作者： Stephen M.Riordan roger Williams Institute of Hepatology University College London and University College London HospitalsLondonEngland Department of GastroenterologyThe Prince of Wales HospitalSydneyAustralia Institute of Hepatology University College London and University College London HospitalsLondonEngland

Studies performed in experimental small animalswith hepatic-based metabolic disorders but nostructural liver disease,including Gunn andanalbuminaemic rats and rabbits with inherited low-density lipoprotein receptor deficiency,have shownthat up to 95% of hepatocytes transplanted into thespleen or liver remain in these sites,withimprovement in metabolic function

关键词： liver failure acute liver diseases liver transplantation gene therapy animals laboratory transfering growth factor beta

Sampling errors of the global mean sea level derived from TOPEX/Poseidon altimetry

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

Acta Oceanologica Sinica 2011年第6期30卷 12-18页

作者： wagner Carl National Oceanic and Atmospheric Administration National Environmental Stellite Data and Information Service

Sampling errors of the global mean sea level derived from TOPEX/Poseidon （T/P） altimetry are explored using 31/ 4a of eddy-resolving numerical model outputs for sea level. By definition, the sampling errors would not exist if data were available everywhere at all times. Four problems with increasing and progressively added complexities are examined to understand the causes of the sampling errors. The first problem （P1） explores the error incurred because T/P with turning latitudes near 66° latitudes does not cover the entire globe. The second problem （P2） examines, in addition, the spatial sampling issue because samples are only available along T/P ground tracks. The third problem （P3） adds the additional complexity that sea level at any along track location is sampled only once every 10 d versus every 3 d for the model （i.e., the temporal sampling issue）. The fourth problem （P4） incorporates the full complexity with the addition of real T/P data outages. The numerical model （Los Alamos POP model Run 11） conserves the total water volume, thus generating no global mean sea level variation. Yet when the model sea level is sampled in the four problems （with P4 using the real T/P sampling）, variations occur as manifestations of the sampling errors. The results show root-mean-squares （rms） sampling errors for P1 of 0.67 （0.75） mm for 10 d （3 d） global mean sea level, 0.78 （0.86） mm for P2, 0.79 mm for P3, and 1.07 mm for P4, whereas the amplitudes of the sampling errors can be as large as 2.0 （2.7） mm for P1, 2.1 （2.7） mm for P2, 2.2 mm for P3, and 2.5 mm for P4. The results clearly show the largest source of the sampling errors to be the lack of global coverage （i.e., P1）, which the model has actually underestimated due to its own less-than-global coverage （between latitudes about 77° latitudes）. We have extrapolated that a truly global model would show the rms sampling error to be 1.14 （1.28） mm for P1, thus implying a substantially larger sampling error for P4.

关键词： sea level global warming remote sensing physical oceanography