科创中国

11岁男孩发现3万年前的猛犸象躯体俄罗斯11岁男孩叶夫根尼·萨林德尔近日在俄罗斯泰梅尔半岛北部发现一具保存良好的长毛猛犸象尸体,死亡时间距今约3万年.科研人员称这一发现是自1901年来最大同类发现.萨林德尔居住在泰梅尔半岛北部的一所极地研究站附近,8月底在叶尼塞河岸散

根据稻水象甲疫情发生面积计算出其年度蔓延距离,并以数字化方法研究疫情传播速度和防控减缓发生面积,为疫情防控及防控效果评估提供科学依据.

Recursion?by?herbivores?is?the?repeated?use?of?the?same?site?or?plants.?Recursion?by?wild?animals?is?rarely?investigated?but?may?be?ubiquitous.?Optimal?foraging?theory?predicts?site?recursion?as?a?function?of?the?quality?of?the?site,?extent?of?its?last?use,?and?time?since?its?last?use?because?these?influence?site?resource?status?and?recovery.?We?used?GPS?collars,?behaviour?and?site?sampling?to?investigate?recursion?to?foraging?sites?for?two?elephant?Elephas?maximus?borneensis?herds?in?the?Lower?Kinabatangan?Wildlife?Sanctuary,?Borneo,?over?a?12?month?period.?Recursion?occurred?to?48?out?of?87?foraging?sites?and?was?most?common?within?48?hours?or?between?151-250?days,?indicating?two?different?types?ofrecursion.?Recursion?was?more?likely?to?occur?if?the?site?had?previously?been?occupied?for?longer.?Moreover,?the?time?spent?at?a?site?at?recursion?was?the?same?as?the?time?spent?at?the?site?on?the?first?occasion.?The?number?of?days?that?had?passed?between?the?first?visit?and?recursion?was?also?positively?correlated?with?how?much?time?was?spent?at?the?site?at?recursion.?Habitat?type?also?influenced?the?intensity?of?site-use,?with?more?time?spent?at?recursion?within?riverine/open?grass?areas?along?forest?margins?compared?to?other?habitat?types.?Recursion?is?a?common?behaviour?used?by?the?elephants?and?its?pattern?suggests?it?may?be?a?foraging?strategy?for?revisiting?areas?of?greater?value.?The?qualities?of?recursion?sites?might?usefully?be?incorporated?into?landscape?management?strategies?for?elephant?conservation?in?the?area?[Current?Zoology?60?(4):?551-559,?2014].

原发性子宫外的子宫内膜间质肿瘤非常罕见,作者报道27例卵巢原发性子宫内膜间质肉瘤的临床病理特征.患者年龄38~76岁,平均56岁.20例为单侧卵巢病变,7例累及双侧卵巢.肿瘤直径1~20 cm,平均9.5 cm.实性区域切面呈典型的黄褐色,6例伴出血和(或)坏死,囊内常存留血性液体.镜检:肿瘤常表现的独特生长模式为小细胞弥漫性生长,小动脉散布其间.14例可见纤维瘤样结构,10例可见模糊的结节状结构,2例有席纹状结构,10例伴有玻璃样物质沉积,7例伴性索样分化,6例伴平滑肌分化,6例见泡沫细胞形成.肿瘤细胞轻度异型性,核分裂象1~17个/10

《周易》有"大道之原"的美称,虽非诠释造物之道,却包含"造物之道".楚国制器工艺是对《周易》哲学思想的具体阐释和应用,是《周易》"道器说"的组成部分,它们分别从理论和实践两个方面衍生、规范了传统制器工艺文化的基本范畴和美学思想.发掘《周易》与楚国制器工艺的内在联系,对于继承和发展中华独具特色的"道器"文脉体系,具有十分重要的理论价值和现实指导意义.