浅谈蜂胶的保健作用   总被引：1，自引：0，他引：1  

许具晔  许喜兰 《农产品加工．学刊》2007,(2):87-88

论述了蜂胶的来源、原理、保健功能和作用机理,指出生产和食用蜂胶时应注意的问题。  相似文献   

具有保健功能农产品定价策略分析——以蜂蜜为例   总被引：1，自引：0，他引：1  

高芸  赵芝俊 《中国农学通报》2015,31(20):76-81

为掌握蜂蜜市场的价格特征,探讨具有保健功能农产品的定价策略,蜂产业体系课题组2012—2014年对北京、杭州、青岛、郑州、成都市蜂蜜市场开展了调查。基于调查数据文章分析了蜂蜜市场的价格特征及其原因,对不同销售地点同质蜂产品价格进行对比;并结合蜂产业体系经济岗课题组在全国11个省开展的蜂产品生产固定观察点数据分析蜂蜜生产成本构成,探讨蜂蜜价格持续上涨的原因;最后以蜂蜜为例,对保健功能农产品的定价策略进行分析。结果表明:各类蜜种蜂蜜产品价格都略有上升,但巢蜜、中蜂蜂蜜、椴树蜜等产量少、蜜源稀缺的品种上升幅度大;各城市在售同种蜂蜜、国产与进口蜂蜜价差拉大。要解决高质量原料收购价格低,市场上产品质量良莠不齐的问题,关键在于形成从原料蜜收购到终端市场的优质优价机制,产品信息透明,提高顾客对蜂蜜保健功能的认知度。  相似文献   

亚麻籽油的开发利用   总被引：6，自引：1，他引：6  

郭忠贤  赵毅  苏占明  赵萍 《农产品加工．学刊》2005,(4):74-75

亚麻是山西省高寒山区的主要油用作物之一。亚麻籽含油率达到42%,油中不饱和脂肪酸占到主要脂肪酸组成的91%,其中,ω-3脂肪酸含量高达49%,比其他油用作物含量高7倍～50倍。ω-3脂肪酸营养油具有预防冠心病、心脑血管病,降低胆固醇,抗血栓,降血压,提高动脉系统柔性的功能,极具开发价值。ω-3脂肪酸营养油是在常规油脂加工工艺基础上,通过对部分工艺的改进,使产品中α-亚麻酸的含量较传统工艺提高了38.9%。  相似文献   

棉籽和蓖麻籽的冷榨试验与数值模拟   总被引：3，自引：0，他引：3       下载免费PDF全文

郑晓  林国祥  游燕  王经州 《农业工程学报》2007,23(9):260-264

探讨棉籽和蓖麻籽植物油料的冷榨应力-应变关系、应力-压缩比关系以及加载速率对应力-应变关系和应力-压缩比关系的影响，探讨临界压榨压力选取问题。进行了棉籽和蓖麻籽冷榨试验，采用川北方程建立双曲线型应力-应变模型和压缩比的理论计算模型。研究表明，加载速率对油料破碎应力、应变以及应力-应变关系有影响，速率越大，破碎应力和应变越大；棉籽和蓖麻籽的模拟结果与实测值比较吻合。根据压缩比变化率及其斜率曲线近似确定出棉籽和蓖麻籽工程临界压榨压力分别为70 MPa和100 MPa。  相似文献   

地表坡度与薄层水流侵蚀关系的研究   总被引：21，自引：2，他引：21       下载免费PDF全文

吴普特  周佩华 《水土保持通报》1993,13(3):1-5

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Diagnosis of sugar beet (Beta vulgaris L.) nutrient imbalance by DRIS and CND-clr methods at two stages during early growth     

Przemysław Barłóg 《Journal of plant nutrition》2016,39(1):1-16

High yield of sugar beet require adequate mineral nutrition. To be diagnosed across interacting nutrients using appropriate interpretation models, the plant must be sampled at a critical physiological stage. This study aimed to develop and validate norms at the 7-leaf and well-developed rosette stages, for diagnostic purposes using the Diagnosis and Recommended Integrated System (DRIS) and Compositional Nutrient Diagnosis based on centered log ratios (CND-clr). Data on nutrient concentrations and plant performance were obtained from 409 plots in West-Central Poland. With respect to the growth stages, for physiological and practical reasons, the 7-leaf stage is preferable for diagnostic purposes. At this growth stage, the high-yield subpopulation characterized by higher concentration of potassium and sodium compared to other nutrients. CND-clr indices were closely related to DRIS indices (R² > 0.93). The CND-clr indices, however, better explained the differences in the white sugar yield within the validated dataset than the DRIS indices.  相似文献   

Effects of acid deposition on Dutch forest ecosystems     

W. de Vries  E. E. J. M. Leeters  C. M. A. Hendriks 《Water, air, and soil pollution》1995,85(3):1063-1068

Effects of elevated S and N deposition on the solution chemistry of Dutch forest soils are mainly manifested by increased concentrations of Al associated with increased concentrations of SO₄ and NO₄. Presumed critical Al/base cation ratios are often exceeded below 20 cm soil depth. There is also evidence that elevated N deposion during the last decades affected the forest nutrient status and caused large changes in forest vegetation. About half of the Dutch forests have absolute shortage of P and relative Mg deficiencies compared to foliar N contents. Evidence from field studies of a relationship between soil acidification and nutrient imbalances in the soil and the foliage on one hand and the vitality of forests on the other hand is, however, lacking.  相似文献   

利用叶绿素仪和叶色卡实施旱直播稻田的实地氮肥管理   总被引：3，自引：0，他引：3  

A. M. ALI  H. S. THIND  S. SHARMA  YADVINDER-SINGH 《土壤圈》2015,25(1):72-81

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The relationship between salmonid fish densities and critical ANC at exceeded and non-exceeded stream sites in Scotland     

R. Harriman  E. E. Bridcut  H. Anderson 《Water, air, and soil pollution》1995,85(4):2455-2460

The critical load concept is now accepted throughout Europe as a means of estimating the sensitivity of key components of aquatic and terrestrial ecosystems to atmospheric inputs of sulphur (S) and nitrogen (N). Current UK freshwater maps, based on steady-state water chemistry, are derived using a critical acid neutralising capacity (ANC_LIM) value of zero eql^–1, which is based on the probability of occurrence of salmonid fish in lakes. In practice most acidification damage to salmonid fish occurs in nursery streams at the emergence and first feeding stages. In general a clear relationship exists between salmon (Salmo salar L.) and trout (S. trutta L.) densities in Scottish streams and ANC values. However, differences between sites depend on which ANC value is used (eg maximum, minimum or mean). By contrast, when the exceedance of critical loads is compared with salmonid densities the relationship is less clear because many exceeded sites have good salmonid densities. Many of these latter sites are found in north-west Scotland where sea-salt inputs are high and ANC is usually greater than zero eql^–1, although diatom-based studies indicated slight acidification of these waters, with a point of change in diatom flora close to ANC=20 eql^–1. These false exceedances are probably due to preferential adsorption of acidic SO₄ deposition which results in an overestimate of exceedance values. All sites with a mean ANC 0 are fishless but some sites with negative minimum ANC values had normal salmonid densities. Consequently a mean ANC_LIM value of zero in the critical load equations for UK freshwaters appears to be too low to protect salmonid stocks. Values between 20–50 eql^–1 represent a more realistic range if prevention of long term damage to salmonid stocks is to be achieved.  相似文献   

黄土高原长历时土壤侵蚀暴雨标准初探   总被引：2，自引：1，他引：2  

王占礼  焦菊英 《水土保持通报》1992,12(3):25-28

本文从黄土高原的降雨、径流、入渗、暴雨的实际情况及收集暴雨资料的需要出发,阐述了拟定长历时(60～1440min)土壤侵蚀暴雨标准的必要性和思路。根据这个思路,笔者在已拟定的短历时(5～60min)暴雨标准基础上,参考有关资料,拟定了长历时土壤侵蚀暴雨标准。  相似文献