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看过了几种大型食草动物的尿样结晶后,虽然让我大开眼界,惊诧它们与人类完全不同的结晶样式,但没有出现我所预料并期盼的、可以在偏光显微镜下闪出绚烂多彩的光性物质结晶,只是大猩猩的尿样中有一点点光性物质结晶,而且与人类的尿样结晶样式迥然不同,这些结晶到底是什么物质, 相似文献
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麝香鼠是原产于北美洲的一种小型食草动物(鼠类),原名青根貂,又名麝狸等.麝香鼠是它在中国被使用最广泛的名字.这是因为雄性麝香鼠体内能分泌一种类似于麝香和灵猫香的香料. 相似文献
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Nickel accumulation and its effects on the survival rate of Spodoptera litura Fabricius under continuous nickel stress 总被引:2,自引:0,他引:2
SUN HongXia SHU YingHua TANG WenCheng WANG Qi ZHOU Qiang ZHANG GuRen 《科学通报(英文版)》2007,52(14):1957-1963
The artificial diets mixed with various concentrations of nickel were offered to the larvae of the phytophagous insect Spodoptera litura Fabricius for 3 generations. Nickel accumulations in the 6th instar larvae, pupae and newly emerged adults of the corresponding generations of S. litura were investigated by Inductively Coupled Plasma-Atomic Emission Spectrometer (ICP-AES), and the effects of nickel accumulations on the survival rate of S. litura were also evaluated by individual rearing. The results showed that nickel accumulated in the 6th instar larvae, pupae and adults of S. litura, and the accu- mulated nickel in all the tested developmental stages within a generation increased with the increase of the nickel doses in the treated diets and showed significant dose-dependent relationship with the nickel doses in the artificial diets. The results also indicated that the nickel accumulations in the 6th instar larvae, pupae, and newly emerged adults from the 3rd generation were higher than those from the 2nd generation, which were also higher than those from the 1st generation. Nickel concentrations in pupae and adults were significantly lower than those in larvae, which indicated that the excessive nickel might be excreted during metamorphosis. Furthermore, larval survival rate, pupation rate and eclosion rate of S. litura in the tested three generations all decreased with the increase of the nickel doses in the treated diets. 相似文献
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非洲水牛,又称非洲野牛或非洲野水牛,它们的家园主要在中非和东非地区,喜欢栖身在靠近水源和被植物密集覆盖的地方……一天,两个人在非洲的一处大草原上游览,忽然见一群非洲水牛朝他俩这边狂奔而来,他俩极为惊喜——真是难得一见的壮阔场景啊!他俩连忙举起照相机,要将千载难逢的瞬间画面变为永恒的记忆。然而,他俩完全没有想到,非洲水牛的奔跑速度每小时可达60千米,就在他俩刚刚举起相机正 相似文献
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一望无垠的平原,古老的火山坑:坦桑尼亚神奇的土地成为大自然的实验场。一种小型的食草动物成为现今世界上羚羊和河马的祖先。时至今日,这里仍然是世界上哺乳动物最密集的地方。 相似文献
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怀柔地处北京与河北边界。2009年1月,怀柔北部的某片山地发生了猛兽咬死羊的事件,有人说可能是豹子干的。于是,我的北京寻豹之旅便从此开始了。从2009年至2011年,三年间我们在怀柔的一片山林走了不少地方,涵盖面积约有15平方公里。怀柔属燕山山系,我调查的这片林区的海拔最低处位于一个人工水库的水平面,为500米;最高处为我们称之为东山的山顶处,为880米。我们一开始的目标是寻找可能存在的华北豹。通过寻访民间,得知此地曾经存在的兽类主要有猫科动物中的豹、豹猫,犬科动物中的狼、赤狐、貉,鼬科动物中的猪獾、狗獾、黄鼬,灵猫科动物中的果子狸,此外还有食草动物如狍、野猪、斑羚、原麝、野兔、剌猬等。 相似文献
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