Nucleic acids: What they are and what they do

Extract

The study of nucleic acids is without question one of the most vital fields in biochemistry today. The new discipline of “Molecular Biology” which has recently arisen is very largely concerned with the part that these chemicals play in living cells. This great upsurge of interest is perhaps to be understood when it is realized that it has now been established that nucleic acids carry the reserve of genetic information which directs and controls the development of any organism, and they are in addition intimately concerned with the actual mechanism of protein synthesis. Thus, they not only carry the blueprint of the design of an organism, they also control and carry out a good deal of the construction.     

如何让猪用益生素发挥作用

<正>畜禽饲料中抗生素的禁用,已重新引起了人们对使用活菌培养物或直接饲喂微生物(也所谓的益生菌)作为抗生素替代品的兴趣。     

治疗仔猪断奶后腹泻——复合产品是否值得一试

仔猪断奶后腹泻在猪场的发生率很高,这使养猪生产者遭受了严重的经济损失。有机酸可导致胃内pH值下降,不利于致病菌生存。但由于致病菌的固有抵抗力,含有大量游离有机酸的混合物,与植物化学物质和渗透性物质（Biotronic Top3）的联合使用可以更有效地提高动物的生产性能和控制致病菌。     

Cleanliness of broilers when they arrive at poultry processing plants

An eight-point photographic scale from 1 (very clean) to 8 (very dirty) was used to assess the cleanliness of the plumage of 69,783 live broiler chickens delivered in 54 loads to three processing plants which were each visited in spring, summer and winter. There were considerable variations between the plants and between the visits, but most birds were given scores of 6 or 7. The average plant scores were 6.07, 6.56 and 6.84, which were associated with frequencies of birds with scores of 7 or more of approximately 38, 56 and 73 per cent. There was some indication that longer feed-withdrawal times of up to 10 hours were associated with dirtier birds.     

隐性霉菌毒素对养猪者意味着什么

我们都知道霉菌毒素给养猪业造成损失,但是损失到底有多大,很久以来一直是个疑问,直到最近在《农业和食品化学杂志》上发表的一篇学术论文对     

North American veterinary pathology residency training programs: an overview of where they are today and where they were five years ago, with an analysis of trends

An e-mail/telephone survey of all active North American residency training programs in veterinary pathology was conducted in September 2005. The purpose of this survey was to determine current numbers of trainees, their program length and type, and salaries; to compare current numbers to five years earlier; and, finally, to gauge interest in expanding current programs. All 41 training institutions contacted responded to the survey. Briefly, the survey found that there are currently 235 veterinary pathology residents, for a mean of 5.7 residents per training program. The number of residents currently in training programs and the number of applicants for these programs has increased compared to five years earlier. There is widespread interest in further expanding capacity in these programs, and the coalition of the American College of Veterinary Pathologists and the Society of Toxicologic Pathology is a well-known source of possible funding for additional residents. This survey report further documents the numbers of combined residency/PhD programs, average starting salaries for new residents, outside sponsorship effects on pathology training programs, and some of the common concerns regarding veterinary pathology training programs voiced by the respondents. While residency training capacity has expanded in the last five years, and there is widespread desire to further expand these training programs, a shortage of veterinary pathologists for future market needs will need to be addressed by increased funding from as yet unspecified sources.