Results 121 to 130 of about 1,237,061 (158)
, 2012 于2008—2010年在长江上游四川合江和重庆木洞江段共采集圆筒吻鮈样本511尾,研究了其年龄与生长特征,并提出了合理的鱼类资源保护对策。结果表明,所采集的圆筒吻鮈分6个年龄组,2—4龄居多,占95.7%;体长与鳞径为直线正相关,雌雄群体间无显著差异,表达式为L=51.28 R+37.45(r=0.85,n=397);各龄组、雌雄群体的实测体长均值和退算体长均值无明显差异(t=0.751,P>0.05);体长与体重呈幂函数关系,雌雄群体间无显著差异,表达式为W=8×10 6L3.099(r=0.97,n=
王美荣 +5 more
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Identification of spontaneous age-related cataract in Microtus fortis. [PDF]
Zhong Nan Da Xue Xue Bao Yi Xue BanHe T +9 more
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, 2012 认识鱼类的生活史特征及其对生态环境变化的响应,是鱼类物种保护与资源合理利用的基础。于2009年5月至2010年4月研究了黄山地区徽水河中宽鳍鱲(Zacco platypus)的年龄、生长和繁殖。共采集标本352尾,雌雄性比为0.49∶1,与1∶1差异显著。以鳞片为年龄鉴定材料,雌、雄个体的最大寿命均为3龄;年轮主要形成于3月份。全长和体重呈幂函数关系,两性间无显著性差异,关系式表达为W=6×10–6L3.10;全长和鳞径呈线性关系,且两性间差异显著,关系式分别表达为L♀=29.58R+38.84和L ...
储玲 +5 more
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[The study of detection and etiology of delayed sensorineural hearing loss in children]. [PDF]
Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za ZhiHu Y, Xia Z, Yao C.
europepmc +1 more source
[Analyzing the factors influencing speech recognition ability in patients with age-related hearing loss]. [PDF]
Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za ZhiZhang W, Yu S.
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Zhongshan Daxue xuebao. Yixue kexue ban, 1992 应用多重逐步回归对842颗成人牙齿结构变化测量法,分级法和对数转换数据进行分析研究,从而推导出利用单颗牙齿推断年龄方程,根据适用范围和牙齿类型的不同,从实验组得到的方程推断年龄的估计标准误分别为2.4～5.6岁,各方程测试于考核组标本时,估计的标准设分别为1.9～5.4岁,提高了利用单颗牙齿推断年龄的准确性和可靠性,对数转换对提高年龄复相关系数和减少推断年龄的估计的标准误有显著意义 ...
doaj
[Neurodevelopmental catch-up status and correction termination age in preterm infants of different gestational ages]. [PDF]
Zhongguo Dang Dai Er Ke Za ZhiCheng W +4 more
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[Trends in the incidence and mortality of rheumatoid arthritis in China from 1990 to 2021: An age<b>-</b>period<b>-</b>cohort analysis]. [PDF]
Zhong Nan Da Xue Xue Bao Yi Xue BanDou X, Cui W, Han Z, Che Z, Li X, Guo H.
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[A study of mismatched negative in normal hearing patients of different ages]. [PDF]
Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za ZhiZhang L, Xu L, Guan B, Jiao C, Zhu B.
europepmc +1 more source