共查询到20条相似文献，搜索用时 62 毫秒
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张丽峰 《四川畜牧兽医学院学报》2012,(2):109-110
从Halliday的三大语言功能——概念功能、人际功能以及语篇功能对经济贸易英文合同体裁的特点进行分析得出,技术贸易合同注重物质过程,多用并列句来表达关系过程,用条件句或限制来表达行为过程;合同当事人之间的特殊关系决定了情态的运用和交际的控制;衔接多重复,多用有古语色彩的介词搭配保持意思的严密和确切。 相似文献
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赵小博余诗强黄新蒋林树 《动物营养学报》2023,(1):99-109
天然植物中的功能组分具有抗炎、抗氧化、提高机体免疫力等生物学功能,其机理主要是通过影响生物网络中的潜在靶点进而影响机体的生命活动。鉴于天然植物功能组分的结构复杂性与功能多样性,相关的研究主要集中在组分鉴别、代谢机理及生物功能等方面,而关于功能组分-生物学功能-作用靶点关系的研究甚少。本文综述了功能组分-生物学功能-作用靶点关系网络的研究现状、在饲料营养研究领域的应用、面临的挑战以及未来展望,以期为饲用天然植物功能组分的研究提供理论支撑。 相似文献
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胎盘的功能最新研究进展 总被引：2，自引：0，他引：2
胎盘通常是指由尿囊绒毛膜和子宫黏膜发生联系所形成的构造。其尿囊绒毛膜的绒毛部分称为胎儿胎盘 ,子宫黏膜部分称为母体胎盘。胎盘担负着胎儿的消化、呼吸和排泄器官的作用。使胎儿进行气体交换 ,供给胎儿营养、排泄废物 ,此外还具有内分泌功能 ,防止母体内的抗体、微生物和寄生虫及虫卵进入胎儿体内。这些作用是通过渗透、弥散以及复杂的生化变化来实现的[1] 。现将胎盘的功能的研究进展分述如下。1 内分泌作用 胎盘是母体内的一个重要的内分泌器官 ,其内分泌功能部位主要存在于滋养层细胞 ,它由细胞滋养层细胞和合体滋养层细胞组成… 相似文献
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牛初乳是乳牛正常分娩后最初几天内所分泌的乳汁。牛初乳含许多生理功能组份，有多种保健功效，具有普通乳品无法比拟的特点。近年来，国内外已经利用牛初乳开发出多种功能性食品，受到普遍欢迎。本文简介牛初乳及其制品的保健功能研究现状。 相似文献
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吴妞霞 《养殖与饲料．饲料世界》2009,(6)
随着人们生活水平的不断提高,宠物犬逐渐走进千家万户,这是由于宠物犬具有很多优良的社会功能,如护家功能、休闲功能、愉悦功能、稳定功能、教育功能、友谊功能等等. 相似文献
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冷应激和核黄素对动物免疫、抗氧化功能的影响 总被引：1，自引：0，他引：1
冷应激可引起神经内分泌及免疫功能紊乱,可导致脂质过氧化作用加强,影响动物健康及生产;核黄素作为抗氧化维生素之一,在抗氧化体系中起着重要作用,还能增强免疫功能,进而增强机体的冷适应。文章就冷应激和核黄素对动物免疫、抗氧化功能的影响作一概述。 相似文献
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<正>中医认为脾的主要生理功能是主运化,脾健运则饮食物精微物质消化旺盛,脾不健运,则消化、吸收、运输等功能失常。近几年来对脾实质的研究来看,认为脾概括了现代医学消化系统的大部分功能。现代医学认为胰腺是兼有内外分泌功能的腺体。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献