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101.
农业科研院所科研开发模式研究 总被引:1,自引:0,他引:1
阐述了农业科研院所在科研开发过程中的发展现状,指出了其存在的主要问题:精力与经费不足,科研开发两头难以兼顾;产权制度缺陷可能导致农业科研院所背上沉重的包袱;缺乏与企业合作,低水平重复研究现象比较普遍。提出了农业科研院所科研开发模式的建议:优先考虑技术成果直接转让模式,其次推崇合作开发—技术入股模式,最后要慎用创办企业—科研生产销售一体化模式。 相似文献
102.
103.
美国农业一直处于领先地位,不仅得益于其丰富的自然资源和高科技的农业技术,其合理的农产品分布也不可少的影响因素。中国是一个农业大国,农业的发展离不开农产品,农产品的种植种类、农产品的区域分布、农产品的质量发展都直接影响农产品的发展。美国虽然面积和我国差不多,但因为有合理的布局,农产品贸易一直发展良好。要借鉴美国农产品的发展,研究和分析其农产品分布现状很有必要。 相似文献
104.
Effect of temperature on energetic demands during the last stages of embryonic development and early life of Octopus vulgaris (Cuvier, 1797) paralarvae 下载免费PDF全文
This study describes the effect of seasonal average temperatures (14 and 18°C) in the Ría of Vigo, on the utilization of external yolk over the last five Naef stages of development (XV–XX) for Octopus vulgaris embryos. Also, the transference of the outer yolk to the inner yolk sac, and its use during embryonic development and early life by O. vulgaris paralarvae. Temperature had a marked effect on embryonic development, except during stages XV–XIX (until the second inversion) where development time was the same (14 days), regardless of temperature. There were no significant differences in outer yolk decrease between consecutive Naef stages at 14°C and 18°C. Contrary, significant differences at all Naef stages from XV to XIX (both, with or without outer yolk) were observed for inner yolk between temperatures. A higher accumulation of inner yolk in embryos at 14°C was observed, due to lower yolk consumption. Paralarvae incubated at both temperatures were maintained independently at starvation during 4 days. At 18°C, a reduced accumulation of inner yolk, especially during Naef stage XIX, was observed. In 24 h old paralarvae, there was already significant higher inner yolk content at 14°C than at 18°C. Unfed paralarvae at 18°C lost weight faster than those at 14°C, due to higher energetic requirements. Finally, from these results, we propose a paralarvae rearing protocol during the first days after hatching and during the last five Naef stage (XV–XX) at lower temperatures, since the energy requirements are lower during the initial maturation stage. 相似文献
105.
Catherine Locke Paramita Muljono Cynthia McDougall Miranda Morgan 《Fish and Fisheries》2017,18(5):943-957
There has so far been limited investigation into gender in relation to innovation in fisheries. Therefore, this study investigates how gender relations shape the capacity and motivation of different individuals in fishing communities to innovate. We compare six fishing communities in Cambodia, the Philippines and the Solomon Islands. Our findings suggest that gendered negotiations mediate the capacity to innovate but that wider structural constraints are important constraints for both men and women. Our findings show that men's and women's capacity to innovate is strongly mediated by the behaviour of their marriage partner. Consequently, we argue that gender research from a social relational perspective has an important contribution to make in understanding poor fishing communities where new ways of doing things or new technologies are being promoted. 相似文献
106.
In response to customer concerns related to gluten strength in commercial baking, the Canadian Grain Commission assessed whether the Canadian Short Process (CSP) test bake method was generating useful data related to intrinsic strength of wheat varieties. Assessment of CSP loaf volume data for Canadian variety trials spanning 2003 to 2013 showed very little correlation with dough strength parameters as measured by farinograph and extensigraph. A lean no time (LNT) test baking method was developed that can better discriminate genotypes and provide objective indicators of the effect of intrinsic dough strength on baking quality. From early method development, through method validation and verification using diverse sets of samples targeting different Canadian wheat classes and grown in three different crop years, results showed the LNT method to be more discriminating and easily adopted by other laboratories. In 2015, the LNT method was adopted as the method of choice in future Canadian variety registration trials. The LNT method is fast, simple and well-suited to high throughput test baking conditions encountered in the evaluation of large numbers of breeder lines. A new objective parameter, loaf top ratio, was also introduced and found to correlate well with dough strength and dough handling properties. 相似文献
107.
疣吻沙蚕胚胎发育观察及盐度对其孵化的影响 总被引:2,自引:0,他引:2
采用显微镜观察了疣吻沙蚕(Tylorrhynchus heterochaeta)胚胎发育不同时期特征,并依据疣吻沙蚕人工孵化经验设置6个盐度梯度组(A:0,B:5,C:10,D:13,E:15,F:20),每组3个平行,研究了盐度对疣吻沙蚕受精率和孵化率的影响。结果表明,疣吻沙蚕胚胎发育可分为受精卵、卵裂期、囊胚期、原肠期、前担轮幼虫期、后担轮幼虫期、膜内三刚节疣足幼虫期和三刚节疣足幼虫期8个时期;盐度对疣吻沙蚕孵化影响显著(P0.05),C组受精率和孵化率最高,与其他组存在显著差异(P0.05)。适宜受精的盐度范围为10~13,最适孵化的盐度为10。 相似文献
108.
果品产业高质量发展是兼顾经营者、生产者、消费者利益的更高层面的发展;推动山东果品产业高质量发展对于应对产业面临的挑战与压力、促进乡村振兴、落实新发展理念、增加农民收入等都具有十分重要的意义;山东果品产业发展水平具备了由追求高产量向追求高质量发展转变的客观条件;推动山东果品产业高质量发展,需要在充分发挥市场配置资源的决定性作用的同时,更好地发挥政府作用。 相似文献
109.
菠菜是一种营养丰富、经济价值较高的作物,在我国栽培历史悠久,很多地区都能广泛种植。菠菜在我国蔬菜产业中的地位较高,其产量和品质对于我国蔬菜产业的发展影响较大。我国菠菜产业发展速度很快,但在国际市场上的竞争力仍略显不足。本文对我国菠菜的生产现状进行了分析,发现存在诸如品种缺乏竞争力、生产布局分散、产品品质不高、出口形势不乐观等问题,在此基础上提出了菠菜产业的发展策略,为切实推动我国菠菜产业发展提供理论参考。 相似文献
110.