Results 41 to 50 of about 596,639 (164)
Environmental 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
四川大学学报. 自然科学版, 2010 对段木栽培不同生长期的赤芝水煎液样品,分别进行小鼠负重游泳试验、戊巴比妥钠诱导小鼠睡眠试验、小鼠急性缺血性缺氧试验、对S180荷瘤小鼠瘤重影响试验及对PCI2细胞分化影响试验,并分别测定其多糖和三萜的含量.研究发现,赤芝菌柄期的样品对戊巴比妥钠所致的小鼠睡眠时间有一定的延长作用,对急性脑缺血性耐缺氧的小鼠的喘气时间有显著的增加,并对PC12细胞分化影响最为明显,赤芝子实体期的样品能明显延长小鼠负重游泳时间,抑制S180荷瘤小鼠瘤重.
郑林用 +5 more
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TetraDENSITY 2.0—A Database of Population Density Estimates in Tetrapods
Global 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
Conservation 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
银莲花素A对S180、H22和U14细胞小鼠移植瘤的抑制作用
, 2008 背景与目的:有研究证明,从两头尖中分离得到的三萜皂甙银莲花素A在体外具有较好的抑瘤活性。本研究将观察银莲花素A在体内对小鼠移植瘤的抑制活性。方法:MTT法检测银莲花素A对人鼻咽癌KB细胞和人卵巢癌SKOV3细胞的抑制率。体内实验选取小鼠肉瘤S180细胞、小鼠肝癌H22细胞和小鼠宫颈癌U14细胞,观察银莲花素A注射给药对S180、H22和U14细胞小鼠移植瘤的抑瘤率,以及灌胃给药对小鼠肉瘤S180移植瘤的抑瘤率。测定银莲花素A的急性毒性。结果:银莲花素A在体外对KB细胞和SKOV3细胞的IC50分别为4.
丁立生, 吴凤锷, 王明奎
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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
Wildlife 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
Zhongguo 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
Conservation Biology, Volume 38, Issue 4, August 2024.Abstract Eradicating invasive predators from islands can result in substantial recovery of seabirds, but the mechanisms that drive population changes remain poorly understood. Meta‐analyses have recently revealed that immigration is surprisingly important to the recovery of philopatric seabirds, but it is not known whether dispersal and philopatry ...
Jeremy P. Bird +2 more
wiley +1 more source
, 2017 目的初步探讨紫甘薯花青素对小鼠酒精性肝损伤的保护作用。方法用50%乙醇制备小鼠酒精性肝损伤模型,分别ig给予慢性酒精性肝小鼠不同浓度的紫甘薯花青素,给药20 d后,观察小鼠的生长状况,测定脏器指数及血清中天门冬氨酸氨基转移酶(AST)、丙氨酸氨基转移酶(ALT)、乙醇脱氢酶(ADH)、谷胱甘肽还原酶活性系数(GRAC)等生化指标,对肝脏组织行HE染色分析。结果紫甘薯花青素可显著降低酒精性肝模型小鼠血清中AST、ALT的活性及肝、脾脏指数,增加ADH的含量及肾脏指数,可明显减轻小鼠的肝组织损伤程度 ...
王禹 +4 more
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