【摘 要】
：
植物的种子有大有小,形状也各式各样。小的一粒种子只由几十个细胞组成,长度只有几百微米,每粒种子仅重二百万分之一克(象某些兰科植物的种子)。大的,每粒种子竟重达30多斤,
论文部分内容阅读
植物的种子有大有小,形状也各式各样。小的一粒种子只由几十个细胞组成,长度只有几百微米,每粒种子仅重二百万分之一克(象某些兰科植物的种子)。大的,每粒种子竟重达30多斤,例如长在西印度洋塞舌尔群岛的海椰子种子就是这样。形状有球形(如核桃)、肾形(如大豆、金花菜等的种子)、多角形(如三裂豚草种子)等。颜色也是多种多样,有棕色、黑色、红色、黄色、白色,还有不同颜色组成美丽的花纹。种皮的表面也各异,有的种
Plant seeds are large and small, the shape is also varied. A small seed consists of only a few dozen cells, only a few hundred microns in length, and weighs only about two millionth of a gram (like the seeds of some orchid plants) per seed. Large, each weighing up to 30 kilos of seeds, such as the sea coconut seeds growing in the West Indies Seychelles. The shape of a spherical (such as walnuts), kidney-shaped (such as soybeans, ginned seeds, etc.), polygons (such as three cracked ragweed seeds) and so on. The color is also varied, with brown, black, red, yellow, white, as well as different colors form a beautiful pattern. The surface of the seed coat is also different, some species
其他文献
In recent years, blind source separation (BSS) by independent component analysis (ICA) has been drawing much attention because of its potential applications in
山铝是国家“一五”时期建设的156个重点项目之一。今天历经60年风雨磨砺的“老兵工”精神依然生机勃发。“老兵工”精神入脑入心,滋养了几代山铝人,形成了具有自己独特标识
请下载后查看，本文暂不支持在线获取查看简介。
Please download to view, this article does not support online access to view profile.
曾经的国内前三大视频网站之一的我乐网关停,已经砸入我乐网的3000万美元要想“解套”是何其之难。视频牌照的政策暗礁浮出了水面,也使资本陷入了未知风险的死循环。
Once t
请下载后查看，本文暂不支持在线获取查看简介。
Please download to view, this article does not support online access to view profile.
FRAMIG 2000 is a population-based survey of medical and therapeutic managemen t of migraine in France. A total of 312 migraine sufferers were first identified f
今天一大早,哈维就拉着家里的大山羊出去吃草。在他家附近,有一块边长8米的正方形地,里面长满了绿油油的青草。他刚到草地,托尼也拉着他家的大绵羊过来了。两人一商量,分别把
2月16日晴从前,文具盒里面住着一群好伙伴。一天,它们在讨论,谁的功劳大。铅笔说:“小主人天天用我来画精美的图案,我的功劳大。”尺子说:“小主人划线时要用我才能画出直直
In a recent, hospital-based report, we described a small series of 5 patients with unilateral, more or less chronic, severe forehead pain, that could be tran si
请下载后查看，本文暂不支持在线获取查看简介。
Please download to view, this article does not support online access to view profile.