Thyroidectomy in dogs with thyroid tumors: Survival analysis in 144 cases (1994-2018)     

Daniela Enache  Livia Ferro  Emanuela M. Morello  Federico Massari  Giorgio Romanelli  Stefano Nicoli  Stefano Guazzetti  Federico Porporato  Eric Zini 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2023,37(2):635-647

  相似文献   

Emerging Marine Biotoxins in European Waters: Potential Risks and Analytical Challenges     

Paz Otero  Marisa Silva 《Marine drugs》2022,20(3)

Harmful algal blooms pose a challenge regarding food safety due to their erratic nature and forming circumstances which are yet to be disclosed. The best strategy to protect human consumers is through legislation and monitoring strategies. Global warming and anthropological intervention aided the migration and establishment of emerging toxin producers into Europe’s temperate waters, creating a new threat to human public health. The lack of information, standards, and reference materials delay effective solutions, being a matter of urgent resolution. In this work, the recent findings of the presence of emerging azaspiracids, spirolildes, pinnatoxins, gymnodimines, palitoxins, ciguatoxins, brevetoxins, and tetrodotoxins on European Coasts are addressed. The information concerning emerging toxins such as new matrices, locations, and toxicity assays is paramount to set the risk assessment guidelines, regulatory levels, and analytical methodology that would protect the consumers.  相似文献   

某锑矿区土壤重金属污染及潜在生态风险评价（英文）     

张伟  葛建团 《农业科学与技术》2015,(3):600-602

为研究某锑矿区土壤质量现状,对锑矿区土壤进行布点取样,分析了Sb、Cd、Cr、Cu、Zn、Pb、Hg、Ni、As 9种元素含量,并运用单因子污染指数、内梅罗指数及潜在生态风险指数对土壤重金属污染状况进行了评价。结果表明,采用内梅罗指数法对该锑矿区土壤重金属污染程度进行评价时,各采样点的内梅罗指数均小于0.7,属清洁状态;采用潜在生态风险指数法对该锑矿区土壤重金属污染情况进行潜在生态风险评估时,各采样点综合潜在生态风险指数均小于150,属轻度污染。  相似文献   

农业风险的认识与管理对策     

魏文迪 《安徽农业科学》2007,35(11):3420-3422

通过对农业风险的各种具体形式、特性的分析,加深了对农业风险的认识和了解,进而提出了一些对农业风险的管理对策,以化解农业风险,保障农业安全.  相似文献   

农业保险保费补贴政策是否缓解了农产品市场风险     

宋长鸣  赵方潇  韩梦娟 《农业现代化研究》2022,43(4):598-605

最近几年的中央一号文件均有涉及深化农业保险发展的内容,在进一步推进农业保险前,探究农业保险保费补贴政策是否有效降低农产品市场风险有显著的政策和现实意义。本文以首批中央财政农业保险保费补贴的农产品水稻、玉米、小麦、大豆和棉花为例,首先利用Chow检验判断中央财政出台农业保险保费补贴政策是否为大宗农产品价格变化的一个间断点,之后利用GARCH模型探究中央财政施行农业保险保费补贴后,农产品市场价格波动的风险是否发生显著变化。结果表明,农业保险保费补贴政策实施后,水稻、玉米、小麦、大豆和棉花价格的变异系数明显下降;中央财政对农业保险保费补贴是这5类农产品价格变动的一个间断点。GARCH模型证实了农业保险保费补贴政策降低了这5类农产品价格的波动程度,即农业保险保费补贴政策缓解了大宗粮棉油农产品市场风险。研究表明,中央财政补贴农业保险保费的政策,实际上是利用市场化手段间接管控农业风险,这种方式是有效的,夯实了农业保险扩面、增品、提标的必要性。  相似文献   

一种基于PSO的改进光流算法     

刘建  李峰  周书仁  黄龙 《湖南农业大学学报(自然科学版)》2014,(4):68-73

在假设各个业务线的增量已决赔款服从伽玛分布、逆高斯分布和对数正态分布的基础上, 建立了各个业务线增量已决赔款的GAMLSS模型, 并将此模型应用于一组具有明显异方差的车险数据, 拟合效果优于均值回归模型. 另外, 在多个业务线的准备金估计中, 不同业务线之间的相依性通过藤Copula函数来描述. 用D藤Copula描述相依关系的GAMLSS模型对准备金的评估结果既优于独立假设下的GAMLSS模型和链梯法对准备金的评估结果,同时还刻画了不同业务线之间的尾部相依性.  相似文献   

转基因食品感知风险对消费者购买意愿的影响研究——基于武汉市消费者的调查分析     

董园园  齐振宏  张董敏  冯良宣 《中国农业大学学报》2014,19(3):27-33

消费者对转基因食品(Genetically Modified Foods,GMF)的感知风险及购买意愿不仅事关政府和企业的相关决策,而且事关转基因食品的可持续发展。本研究基于武汉市384名消费者的调查数据,通过因子分析和回归分析的二步模型,对消费者的GMF感知风险及其对购买意愿的影响进行实证分析。研究表明,消费者对GMF的感知风险主要集中在4个方面,即:人体健康风险、社会经济风险、生态环境风险和食品功能风险。其中,前三者显著影响消费者对GMF的购买意愿,食品功能感知风险对GMF购买意愿的影响并不显著。  相似文献   

Death from anthropogenic causes is partially compensatory in recovering wolf populations     

Dennis L. Murray  Douglas W. Smith  Curtis Mack  Joe Fontaine  Michael Jiminez  Thomas J. Meier  James Holyan 《Biological conservation》2010,143(11):2514-2524

There is substantial interest in how mortality rates affect animal populations, but mechanisms explaining when and under what circumstances particular causes of death incur demographic responses are far from clear. In theory, small or expanding populations should experience additive mortality from anthropogenic causes of death, but whether such effects are homogenous across a population or expressed only in certain high-risk individuals is open for debate. We used competing risks models to analyze mortality patterns among radio-collared wolves (Canis lupus, n = 711) from three populations in northwestern United States (1982-2004), and evaluated the degree to which anthropogenic mortality was additive vs. compensatory to natural demographic processes. Almost 80% (n = 320) of wolves dying of known fates were killed by anthropogenic causes (legal control, illegal killing, harvest in Canada, vehicle collision), and additive effects of anthropogenic mortality were most pronounced in northwestern Montana where wolf exposure to humans and livestock was high compared to either the Greater Yellowstone Area or central Idaho, where anthropogenic risk was lower. In contrast, risk from natural hazards was lower in northwestern Montana than in the other areas, implying some degree of compensatory mortality from anthropogenic risk. Animals recruited to the study following human-wolf conflict had markedly higher anthropogenic risk than those recruited for standard monitoring purposes, and juvenile wolves as well as dispersers, succumbed to higher anthropogenic risk. Multivariate models revealed that increasing wolf population density promoted higher anthropogenic risk and reduced natural risk, indicating that partially-compensatory effects of anthropogenic mortality actually became increasingly additive with population density. The observed compensatory mortality and hazard heterogeneity in our study implies that demographic responses to mortality risk may be complex and more subtle than previously thought; the density-dependent effect of anthropogenic mortality portends a stabilizing influence of humans on recovering wolf populations. We conclude that future assessment of the role of anthropogenic mortality should include individual-based hazard estimation as a complement to traditional population-level approaches.  相似文献   

Risks in Mortgaged Real Estate Appraisal     

《保鲜与加工》2002,(6):80

  相似文献   

The Need and Efforts to Industrialized Housing from Developers     

WU Ya jun 《保鲜与加工》2001,(3):47-49

There exists the problems of low technology, low quality of components and lacked process in the traditional houses. This article states the experience and lesson in the development of Chongqing Longhu Garden, and the efforts of developers in the industrialized housing.  相似文献