Results 51 to 60 of about 22,536 (161)

Toxic Effects and Mechanisms of Polychlorinated Biphenyls(Aroclor 1254) on Glucose Homeostasis in Male Mice [PDF]

open access: yes, 2015
多氯联苯(PolychlorinatedBiphenyls,PCBs)作为最难以降解的持久性有机污染物之一,其引起的环境问题已经受到了极大的关注。有关环境污染物导致糖尿病的机制已经开展了较多的研究,但是关于环境水平的PCBs长期暴露能否导致糖尿病的发生以及其毒性效应机制还不清楚。本研究以C57BL/6品系青春期雄性小鼠为研究对象,研究环境水平的PCBs长期暴露导致糖尿病发生发展的毒性效应机制。采用浓度分别为0.5、5、50和500μg/kg的Aroclor1254,通过灌胃法对小鼠进行染毒 ...
张诗琦
core  

Internal physiological drivers of leaf development in trees: Understanding the relationship between non‐structural carbohydrates and leaf phenology

open access: yesFunctional Ecology, Volume 40, Issue 5, Page 1151-1164, May 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Plant phenology is crucial for understanding plant growth and climate feedback. It affects canopy structure, surface albedo, and carbon and water fluxes. While the influence of environmental factors on phenology is well‐documented, the role of plant intrinsic factors ...
Yunpeng Luo   +8 more
wiley   +1 more source

Effects of olive oil on osteoporosis after artificial menopause [PDF]

open access: yes, 2015
随着妇科恶性肿瘤发病率的逐年上升及越趋年轻化,给社会和家庭带来了巨大的经济和精神负担。妇科恶性肿瘤主要以手术为主,并辅以放化疗。随着手术切除双侧卵巢及放化疗对卵巢损害的发生,将会导致雌激素急剧下降,从而增加骨质疏松症的发病率。目前激素替代疗法(hormonereplacementtherapy,HRT)广泛用于防治人工绝经后骨质疏松症,但是有临床大样本研究表明,HRT虽然能够减缓绝经后骨质疏松症的发生,但也增加了心血管疾病、乳腺癌、中风、糖尿病、宫颈癌、子宫内膜癌、卵巢癌等的发病率 ...
刘慧兰
core  

Wildfire strengthens the relationship between soil biodiversity and ecosystem multifunctionality in subtropical forests

open access: yesFunctional Ecology, Volume 40, Issue 5, Page 1415-1427, May 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Wildfires are disrupting and regenerating forces in nature that affect all ecosystem components. However, the impact of wildfires on soil multitrophic biodiversity and the resulting consequences for ecosystem multifunctionality (EMF) remain poorly understood.
Juan Zhou   +6 more
wiley   +1 more source

中国南方侵蚀土壤退化指标体系研究

open access: yesShuitu Baochi Xuebao, 2000
介绍了国内外土壤退化的评估方法和建立侵蚀土壤退化指标的原则;根据侵蚀土壤的发展过程和属性变化特点,提出了侵蚀土壤退化指标体系;系统全面地论述了侵蚀土壤物理退化、化学退化和生物退化的具体内容和定量指标。为土壤退化从定性研究走向定量化研究提供了有益的方法,同时为科学评估土壤质量变化和防治土壤退化提供重要依据。
史德明 韦启潘
doaj   +2 more sources

不同脂肪源对异育银鲫的生长、体组成和肌肉脂肪酸的影响 [PDF]

open access: yes, 2011
配制了十种等氮等能的饲料饲喂3.53 g的异育银鲫幼鱼12周,探讨异育银鲫对不同脂肪源的利用效果。十种饲料中分别添加8%的鱼油(FO)、椰子油(CNO)、玉米油(CO)、亚麻油(LO)、大豆油(SO)、菜籽油(RO)、1∶1鱼油-椰子油(FCNO)、1∶1鱼油-玉米油(FCO)、1∶1鱼油-亚麻油(FLO)和1∶1∶1∶1鱼油-椰子油-玉米油-亚麻油混合油(MIX)。每组饲料三个平行,每个平行30尾。实验在循环水养殖系统中进行,水温控制在(24±1)℃。结果表明,在单一脂肪源中 ...
朱晓鸣   +4 more
core  

Placental insufficiency markers to assess the risk of non‐chromosomal genetic conditions in early‐onset fetal growth restriction

open access: yesUltrasound in Obstetrics &Gynecology, Volume 67, Issue 4, Page 492-499, April 2026.
ABSTRACT Objectives To assess the value of placental insufficiency markers for estimating the risk of genetic anomalies in fetuses with isolated early‐onset fetal growth restriction (FGR), defined as an estimated fetal weight ≤ 3rd percentile diagnosed ≤ 28 + 6 weeks' gestation.
M. Armengol‐Alsina   +17 more
wiley   +1 more source

黑麂血液生理生化指标的测定

open access: yes野生动物学报, 2007
首次检测了黑麂血液常规和生理生化等23项指标,并与鹿科梅花鹿做了比较。测定结果显示,黑麂的红细胞、血小板、血红蛋白、红细胞比容高于梅花鹿指标,而白细胞、红细胞体积、红细胞平均血红蛋白浓度、平均血红蛋白量、红细胞体积分布宽度指标低于梅花鹿指标。黑麂白细胞分类结果显示,白细胞和单核细胞约占90%;嗜酸性粒细胞和嗜碱性粒细胞所占百分比各占约2%。黑麂血清生化指标测定结果显示,总胆固醇和血糖两项指标高于梅花鹿的指标;甘油三酯(TG)及极低密度脂蛋白(VLDI-C)含量显著高于梅花鹿 ...
陶勇   +4 more
doaj  

Study on Oxidativestress and Bioaccumulation of Three Typical Brominated Flame Retardants in Oryzias melastigma Embryos [PDF]

open access: yes, 2013
多溴联苯醚(Polybrominateddiphenylethers,PBDE)、四溴双酚A(TetrabromobisphenolA,TBBPA)和六溴环十二烷(Hexabromocyclododecane,HBCD)是目前世界上广泛使用的三大溴代阻燃剂(brominatedflameretardants,BFRs)。由于它们的亲脂性、环境稳定性、在生物体中的富集放大作用以及对水生生态系统和人体健康产生一定的毒性效应而受到各界的广泛关注和重视。本研究选取BDE-47 ...
赵琰琰
core  

急性胰腺炎Balthazar CT分级与生化指标的相关性分析

open access: yesZhongguo shiyan zhenduanxue, 2008
目的探讨急性胰腺炎的X线计算机体层摄影(CT)征象与生化指标变化的相关性,为临床诊断和治疗提供帮助。方法选取急性胰腺炎病例110例,将其CT表现分为5级,各级分别与其相应的生化指标数值进行比较与分析。结果急性胰腺炎CT扫描表现与生化指标对比显示如下:A级时,生化指标数值多轻度升高,B级中度升高,C级显著升高,D级趋于下降,E级显著下降。结论CT扫描检查可以准确及时地反映B、C、D、E级的病理变化,明显优于血尿淀粉酶及C反应蛋白数值的改变,而对早期(A级)仅限于间质水肿的炎性反应,CT诊断困难 ...
王丽英, 苏晓明, 杨海山
doaj  

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