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广州健仑生物科技有限公司
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芬兰供应流感胶体金法检测试剂盒
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【公司名称】 广州健仑生物科技有限公司
【市场部】 欧
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【腾讯 】
【公司地址】 广州清华科技园创新基地番禺石楼镇创启路63号二期2幢101-103室
但平均说来只有一半(约47%)到达地面,另一半(约53%)于途中被反射或吸收掉。生物圈各部分实际接受的太阳辐射量差别很大,这是由于纬度、季节以及大气透明度(云层)的影响造成的。热带地区全年接受比较直射的阳光,因而辐射量Z大。随着纬度的ZG,阳光入射角也加大,单位地表接受的辐射量降低。辐射量按千兰/年计算(1兰=1卡/厘米)。Z高值(200千兰/年以上)出现于荒漠地区,例如在北非的撒哈拉沙漠和西亚的阿拉伯沙漠,80%以上的太阳常数能到达地面,原因除纬度低外,主要是干燥少云。Z低值(低于100千兰/年)出现于高纬度地区,包括高于50的大陆地区和高于40的海洋地区。太阳辐射量因季节变化而产生的差异在高纬度地区更为明显,因为那里的日照时间随季节变化很大。
太阳辐射在地球上的不均匀分布,造成了不同的气候类型,从而影响了地球上的生物分布;它也是地面气流(风)、水流和水汽循环的主要动因。
生物圈中的能流与物流是相伴随的,因为太阳辐射能先通过光合作用被植物体固定下来,然后以化学能的形式沿食物链逐级传递。动物和微生物的取食活动就是传递能量的方式。一般说来,化学元素之进入生物体内是靠生物的主动摄取,而化学元素在自然界中的循环运动则是由气流和水流来完成的。陆地生物生存于大气之中,气态营养物和废物很容易在生物与环境间循环运动。一般可溶性物质是随水进出生物体的。就来讲,江河中所携带的可溶性物质,只能随水流由高向低移动,Z后归入湖泊和海洋。当湖水和海水蒸发时,这些物质被留下,有的还形成沉积物。能以气溶胶等形式回到陆地的极少。因此液态的物质循环常常是不完全的。
变,通过的大气距离人是生物圈中占统治地位的生物,能大规模地改变生物圈,使其为人类的需要服务。然而,人类毕竟是生物圈中的一个成员,必需依赖于生物圈提供一切生活资料。人类对生物圈的改造应有一定限度,超过限度就会破坏生物圈的动态平衡,造成严重后果。在地球上出现人类以后大约300万年的时期里,人类与其周围的生物和环境处于合理的平衡之中。人在生物圈中的地位,从对生物圈能施加的影响而言,并不明显地超过其他动物。食物缺乏以及疾病等因素限制着人口密度。
On average, however, only about half (about 47%) reached the ground and the other half (about 53%) were reflected or absorbed on the way. The amount of solar radiation that is actually accepted by various parts of the biosphere varies widely, due to the effects of latitude, season and atmospheric transparency (clouds). The tropical region receives more direct sunlight throughout the year and thus has the highest amount of radiation. As the latitude increases, the incident angle of sunlight also increases, and the amount of radiation accepted by the surface of a unit decreases. Radiation by 1000 Lan / year calculation (1 blue = 1 card / cm). The highest values (over 200 kyrms / yr) occur in desert areas. For example, in the Sahara Desert in North Africa and the Arabian Desert in West Asia, more than 80% of the solar constant can reach the ground due to low dryness and cloudiness, except for low latitudes. The lowest value (below 100 kyrms / year) occurs in high latitudes, including over 50 in the mainland and over 40 in the ocean. The differences in the amount of solar radiation due to seasonal changes are more pronounced in the high latitudes where the sunshine hours vary greatly with the seasons.
The uneven distribution of solar radiation on Earth creates different climate types that affect the biodistribution on Earth; it is also a major driver of surface air currents (winds), currents and vapor cycles.
Energy flow and logistics in the biosphere are companions, because the solar radiation can first be fixed by photosynthesis plant body, and then in the form of chemical energy along the food chain level transfer. The feeding of animals and microorganisms is the way to deliver energy. In general, the chemical elements into the body by biological take initiative, and chemical elements in the nature of the circular motion is by air and water to complete. Terrestrial organisms live in the atmosphere, and gaseous nutrients and wastes can easily circulate between organisms and the environment. Soluble substances generally enter and leave the body with water. Globally, the soluble substances carried in rivers can only move from high to low with the flow of water, and finally fall into lakes and oceans. When the lake and sea water evaporate, these substances are left behind, and some also form sediments. Very few can return to the land in the form of aerosols. Therefore, the liquid material circulation is often incomplete.
Change, the atmospheric distance that passes Man is the dominant creature in the biosphere, capable of altering the biosphere on a large scale to serve the needs of mankind. However, human beings, after all, are members of the biosphere and must rely on the biosphere to provide all living resources. Human beings should have some limits to the transformation of the biosphere. Exceeding the limit will destroy the dynamic balance of the biosphere and cause serious consequences. About 300 million years have passed since mankind appeared on earth, humans and their surrounding organisms and environments are in a reasonable balance. The status of human beings in the biosphere does not significantly exceed that of other animals in terms of their impact on the biosphere. Lack of food and diseases limit the population density.