Results 31 to 40 of about 25,392 (169)

Hurricane Impacts on the Population Genetics of an Endangered Ecosystem Engineer 飓风对一种濒危生态系统工程师的种群遗传学影响

open access: yesIntegrative Conservation, Volume 4, Issue 4, Page 641-651, December 2025.
Key Largo woodrats are a small and endangered island species, whose individuals tend to occur in family groups. Isolation from mainland populations, predation, and habitat fragmentation have caused genetic drift, leading to low overall diversity. Here, we found that a major category 4 hurricane promoted genetic diversity in the Key Largo woodrat ...
Taylor Ackley   +5 more
wiley   +1 more source

神经生长因子对小鼠睾丸支持细胞生理状态影响初探

open access: yesZhongguo shiyan zhenduanxue, 2014
目的探索最佳的小鼠睾丸支持细胞分离、培养及鉴定方案。研究神经生长因子(nerve growth factor,NGF)对小鼠睾丸支持细胞生理状态的影响。方法通过胶原酶、胰酶等处理分离一周龄小白鼠睾丸支持细胞,通过油红O染色对分离得到的细胞进行鉴定;用加入NGF的培养基和对照培养基分别体外培养小鼠睾丸支持细胞,探索NGF对小鼠睾丸支持细胞生长情况的影响。结果分离得到了较高纯度的小鼠睾丸支持细胞,培养48小时后NGF组的小鼠睾丸支持细胞生长情况明显优于对照组。结论 NGF对小鼠睾丸支持细胞生长有着重要的作用。
付璐璐   +7 more
doaj  

Genetic Confirmations of Dwarf Lemurs Across Madagascar Highlights Complex Biogeographic Patterns 马达加斯加全境鼠狐猴的遗传确认揭示了复杂的生物地理模式

open access: yesIntegrative Conservation, Volume 4, Issue 4, Page 665-674, December 2025.
Using a diagnostic mitochondrial marker gene, we document the presence of furry‐eared dwarf lemurs, a species known from Madagascar's eastern montane rainforests, in several forest fragments across the island's central highlands. These findings raise new questions about when this species colonized these sites, how they tolerate these changing and ...
Marina B. Blanco   +27 more
wiley   +1 more source

Comparative Efficiency of Multiple eDNA Sampling Methods for Monitoring Vertebrate Diversity in Mountainous Region

open access: yesEnvironmental DNA, Volume 7, Issue 4, July–August 2025.
This study evaluates the effectiveness of three environmental DNA sampling approaches–water eDNA, air eDNA, and leech‐derived iDNA–for surveying vertebrate diversity in the Gaoligong Mountains of southwest China. Using five metabarcoding primer sets, we detected 235 vertebrate species.
Yunyu Wang   +6 more
wiley   +1 more source

多重耐药性铜绿假单胞菌的分离鉴定及小鼠烧伤感染模型的建立

open access: yesZhongguo shiyan zhenduanxue, 2017
目的分离鉴定多重耐药性铜绿假单胞菌,制备铜绿假单胞菌感染的小鼠烫伤模型。方法常规方法分离纯化铜绿假单胞菌,并经16sRNA序列分析鉴定铜绿假单胞菌;平板稀释法测定分离菌株对18种抗菌药物的耐药性;应用烫伤仪确定小鼠对100℃下不同烫伤面积和烫伤时间的耐受情况,确定最佳烫伤时间和面积建立小鼠烫伤模型;对小鼠烫伤模型皮下感染不同浓度的铜绿假单胞菌,确定72h内全部小鼠死亡的细菌最小致死量,最小致死量感染组小鼠死亡后立即应用平板稀释法检测肝和脾内细菌荷载量。结果分离鉴定得到5株多重耐药性铜绿假单胞菌 ...
郝羽翀   +3 more
doaj  

TetraDENSITY 2.0—A Database of Population Density Estimates in Tetrapods

open access: yesGlobal Ecology and Biogeography, Volume 33, Issue 12, December 2024.
ABSTRACT Motivation Population density is a fundamental parameter in ecology and conservation, and taxonomic and geographic patterns of population density have been an important focus of macroecological research. However, population density data are time‐consuming and costly to collect, so their availability is limited.
L. Santini   +10 more
wiley   +1 more source

An assessment of potential interventions to reduce the totoaba illegal trade market

open access: yesConservation Biology, Volume 38, Issue 5, October 2024.
Abstract The illegal trade in totoaba (Totoaba macdonaldi) is causing adverse social, ecological, and economic impacts. This illegal activity is accelerating the overexploitation of totoaba and pushing the critically endangered vaquita (Phocoena sinus) closer to extinction.
Rodrigo Oyanedel   +3 more
wiley   +1 more source

亮菌多糖对S180荷瘤小鼠免疫功能的研究

open access: yes四川大学学报. 自然科学版, 2007
通过对荷瘤小鼠腹腔注射亮菌多糖后,观察其对荷瘤小鼠淋巴细胞增殖反应、NK细胞活性及对IL-1I、L-2、TNF-α、IFN-γ诱生的影响.研究结果表明:亮菌多糖能够显著提高荷瘤小鼠NK细胞杀伤活性、对ConA刺激的小鼠淋巴细胞有明显的促进作用,提高荷瘤小鼠脾细胞产生IL-2的能力;促进荷瘤小鼠机体细胞分泌TNF-α;明显提高荷瘤小鼠血清中IFN-γ的含量.提示亮菌多糖可通过调节机体免疫功能而间接起到抗肿瘤的作用.
罗霞   +5 more
doaj  

Southern flying squirrel use of forests managed for red‐cockaded woodpeckers in East‐Central Mississippi 密西西比中东部红顶啄木鸟繁殖林中的南方鼯鼠栖息地利用

open access: yesWildlife Letters, Volume 2, Issue 3, Page 131-139, September 2024.
Southern flying squirrels (flying squirrel; Glaucomys volans) frequently displace endangered red‐cockaded woodpeckers (RCW; Dryobates borealis) within forest partitions managed specifically for RCW cavities (“cluster partitions”). We found little to no evidence of differences in home range size and composition between flying squirrels within or outside
Robert T. Meyer   +2 more
wiley   +1 more source

含脐血MSCs 体系扩增后的脐血重建 NOD/SCID小鼠造血的研究

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 2005
【目的】探讨含人脐血(umbilical cord blood,UCB)来源的间充质干细胞(mesenchymal stem cells,MSCs)联合造血生长因子(hematopoietic growth factors,HGFs)体系扩增后的脐血造血细胞在NOD/SCID小鼠体内植入及重建小鼠造血的能力。【方法】①用含女性胎儿脐血MSCs(UCBMSCs)及HGFs组合的无血清扩增体系体外扩增男性新生儿UCB CD34~+细胞。②收获扩增第6天的UCB细胞,经尾静脉移植给亚致死量照射后的雌性NOD ...
周敦华   +8 more
doaj  

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