研究表明，糖苷生物碱具有保护植物防御微生物、昆虫等天敌侵袭的作用，是植物的天然防御物质。
Some investigation have indicated that glycoalkaloids must have been evolved in nature to protect plants against bacteria, fungi, insects, and animals.
顺势疗法可追溯到18世纪，其依据的理念是，导致疾病症状的物质能够促使人体防御机能抑制病症。
Homeopathy, which dates to the 18th century, rests on the notion that substances that cause the same symptoms as an illness can prompt the body's defenses to overpower that illness.
除了抗生素，许多被称为宿主防御增效剂(HDPs)、蛋白束多聚糖或多糖蛋白复合物（PSPCs）的物质已经从蕈类中分离出来。
Besides antibioties, a large number of subtances known as Host Defence Potentiators(HDPs), Protein bound Polysaccharide or Polysaccharide-Protein Complexes(PSPCs) have been isolated from mushrooms.
我们的身体拥有天然的防御机制，能够灭活所有这些化学物质而使之无害。
Our body has a natural defense mechanism that is able to inactivate all these chemicals and make them harmless.
但是，当进食动物蛋白时，这种防御机制就会转而和我们作对，将这些化学物质转变成致癌物。
However, when animal-based protein is eaten, this defense mechanism turns against us and converts these chemicals into carcinogen.
细菌有一种对病毒的防御机制：一种叫做限制性内切酶的化学物质可以切断外源dna。
Bacteria have defences against viruses in the form of chemicals called restriction enzymes, which chop up foreign DNA.
研究显示，这两种食物里的化学物质抑制肿瘤成长，提高身体对抗癌症的天然防御力。
Research suggests chemicals in the foods block tumour growth and boost the body's natural defences against cancer.
这些说明，防御食品中人为的添加化学物质、有害物质有些是可是用肉眼或简单的方法检验出来的。
These instructions, defense artificially added chemicals in food, some harmful substance is but with the naked eye or simple method of inspection.
除了上述典型的过敏性坏死反应特征以外，寄主细胞还产生了细胞壁防御结构和次生物质。
Besides from the above-mentioned typical characters of hypersensitive reaction, the host cells also produced defense structure in cell walls and secondary metabolic materials.
维生素和矿物质，能促进人体的自然防御三个不同的层次。
Vitamins and minerals can contribute to the body's natural defences on three different levels.
增强骨骼。苹果和苹果汁富含矿物质硼。硼的摄入可以增强骨质，有效防御骨质疏松症。
Strengthen bones. Apples and apple juice contain the mineral boron, which has been shown to strengthen bones-a good defense against osteoporosis.
佤族聚落的建筑、防御设施、水利、道路、寨桩、墓地等物质要素都发挥着不可或缺的功能。
The material factors including architecture, defense facilities, water conservancy, road, totem pole in the village, graveyard, etc. play an important role in the village building.
在过去，研究昆虫对植物防御的适应性方面始终关注的是化学反馈，也就是说昆虫如何中和或者改变植物产生的有毒物质。
In the past, scientists who studied insect adaptation to plant defenses have focused on chemical responses. That is, how the insects can neutralize or alter the poisonous substances plants produce.
生物在生存竞争中，产生具有抑制或驱避、毒害作用的反抗物质进行化学防御，这是促进生物协同进化的一个重要因素。
Living things produce anti-compound, which has the function of restraining, expelling and poisoning, and make chemical defense in the struggle of existence.
目前已知的防御化合物主要包括植物次生代谢物质、昆虫消化酶(蛋白)抑制剂、蛋白酶、凝集素、氨基酸脱氨酶和氧化酶。
Major known defense chemicals include plant secondary metabolites, protein inhibitors of insect digestive enzymes, proteases, lectins, amino acid deaminases and oxidases.
人体的循环系统里有一些有害的化学物质，血脑屏障是一道防御这些有害物质的天然屏障，但这道屏障同时也将治疗药物隔于脑外。
This barrier is a natural defence against potentially harmful chemicals floating around the body but has also stopped useful drugs reaching the brain as well.
树脂是树木为防御昆虫侵袭而分泌的物质，变干后呈塑料状，可以留存成百上千万年。
The resin is produced as a defense mechanism against insect infestations. When it dries it becomes a plasticlike substance that can survive for millions of years.
即cdr系统会让细胞暂时停止它们的日常活动，反而让其打开了它们的防御系统，以应对血液中高浓度的，一种称为嘌呤的化学物质。
The CDR makes cells put their ordinary activities on hold and instead switch on their defence systems, in reaction to high levels in the bloodstream of chemicals called purines.
植物防御素是一类小肽物质，具有很广的抑菌谱。
Plant defensins are the low molecular weight peptides, which have a broad spectrum of inhibiting the growth of plant pathogens.
被动的植物自我防御包括物理和化学防护，这些防护保护它们使病原体无法进入，像细菌，或者对侵略者放出一系列的不好闻的气味或是有毒的物质。
Passive plant defense comprises physical and chemical barriers that prevent entry of pathogens, such as bacteria, or render tissues unpalatable or toxic to the invader.
植物与其它有机体种间存在着通过次生物质为媒介的化学作用，这些化学作用在农业生态系统中则表现为植物对有害生物的化学防御。
There are chemical interactions manipulated by plant secondary metabolites between plant and other organisms, which act as plant chemical defense on pests in cropping ecosystems.
它是植物从水生进化到陆生的物质基础，是维持地球碳素循环的重要因素，在植物生长以及对生物与非生物的防御能力方面有着非常重要的作用。
The importance of lignin ranges from its fundamental roles in the evolution of land plants, global carbon cycling, and development, to its role in the biotic and abiotic stress resistance of plants.
BABA是一种化学物质，其可以使植物在面对生物性或非生物性逆境时产生较快的防御反应。
BABA is a chemical which is able to induce rapidly mount defense responses of plants to biotic or abiotic stresses.
BABA是一种化学物质，其可以使植物在面对生物性或非生物性逆境时产生较快的防御反应。
BABA is a chemical which is able to induce rapidly mount defense responses of plants to biotic or abiotic stresses.
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