龙葵的室内栽培及利用

对龙葵的室内栽培和生长习性作了深入研究，提出了龙葵室内栽培的几种方法和利用途径。     

Foraging behaviour,nutrient intake from pasture and performance of free-range growing pigs in relation to feed CP level in two organic cropping systems

In organic pig production one of the major challenges is to be able to fulfil amino acid requirements based on organic and locally grown protein feed crops. The pig is an opportunistic omnivore with a unique capacity for foraging above and below the soil surface. It is hypothesized that direct foraging in the range area can pose an important contribution in terms of fulfilling nutrient requirements of growing pigs. Foraging activity, lucerne nutrient intake and pig performance were investigated in 36 growing pigs, foraging on lucerne or grass and fed either a standard organic pelleted feed mixture (HP: high protein) or a grain mixture containing 48% less CP (LP: low protein) compared with the high protein feed mixture, from an average live weight of 58 kg to 90 kg in a complete block design in three replicates. The pigs were fed 80% of energy recommendations and had access to 4 m² of pasture/pig per day during the 40 days experimental period from September to October 2013. Behavioural observations were carried out 12 times over the entire experimental period. For both crops, LP pigs rooted significantly more compared with HP pigs but the effect of CP level was more pronounced in grass (44% v. 19% of all observations) compared with lucerne (28% v. 16% of all observations). Feed protein level turned out not to have any significant effect on grazing behaviour but pigs foraging on lucerne grazed significantly more than pigs foraging on grass (10% v. 4% of all observations). Daily weight gain and feed conversion ratio were significantly affected by feed protein and forage crop interactions. Compared to HP pigs, LP treated pigs had 33% lower daily weight gain (589 v. 878 g) and 31% poorer feed conversion ratio (3.75 v. 2.59 kg feed/kg weight gain) in grass paddocks, whereas in lucerne paddocks LP pigs only had 18% lower daily weight gain (741 v. 900 g) and a 14% poorer feed conversion ratio (2.95 v. 2.54 kg feed/kg weight gain) compared with HP pigs. LP pigs foraging on lucerne used 169 g less concentrate CP/kg weight gain, compared with HP pigs, indicating the nitrogen efficiency of the system. The results indicate that direct foraging of lucerne may be a valuable strategy in terms of accommodating CP and lysine requirements of organic growing pigs.     

Transfer of blood urea nitrogen to cecal microbial nitrogen is increased by mannitol feeding in growing rabbits fed timothy hay diet

The presence of the fermentable sugar d-mannitol in the diet improves nitrogen (N) utilization in rabbits. To clarify the mechanism by which d-mannitol improves N utilization, we studied the effect of d-mannitol on the fate of blood urea N in growing rabbits. Growing rabbits received a control diet or a diet containing d-mannitol, which were formulated by adding 80 g/kg glucose or d-mannitol to timothy hay. After 9 days of feeding of the experimental diets, ¹⁵N-urea was administrated intravenously under anesthesia 1 h before slaughter. The blood urea level (concentration of both urea N (43.6% of the control group (CG), P < 0.05) and ¹⁵N (95% of the CG, P < 0.05) in blood serum) was reduced in the mannitol group. The concentration and amount of N, and ¹⁵N atom % excess in the contents of the cecum and colon were higher (P < 0.05) in the rabbits fed the mannitol diet than in rabbits fed the control diet, especially in the cecum. The consumption of mannitol caused bacterial proliferation in the cecum characterized by marked short-chain fatty acid production (165% of the CG, P < 0.05), decreased cecal ammonia N (73% of the CG, P < 0.05) and elevated cecal bacterial N (150% of the CG, P < 0.05). On the other hand, addition of d-mannitol to the diet decreased N (80% of the CG, P < 0.05) and ¹⁵N (77% of the CG, P < 0.05) excretion in the urine. These results indicate that d-mannitol increases the transfer of blood urea N to the large intestine, where it is used for bacterial N synthesis.     

岭南大学校园规划溯源（1904—1938）

19世纪末20世纪初，流行于美国的布扎式规划（Beaux-arts Planning）影响了中国的一批校园规划和城市规划建设。岭南大学作为一所完全由美国人建立起来的教会大学，其规划布局及建筑和园林的设计都在一定程度上受到当时美国校园建设的影响。目前对岭南大学的研究中，主要侧重于对其建筑的研究，而在校园规划及环境方面的研究内容甚少。通过采用档案研究、情境分析和形式分析等方法，研究岭南大学的规划思想来源、规划演变过程及其规划方案在本土的落地性，不仅可促进人们对岭南大学更加全面的认知，有利于为现今中山大学历史建筑和园林的保护在真实性和完整性方面提供素材和依据，还为研究布扎式规划对近代中国城市规划建设的影响提供重要案例。     

银杏发展态势及其价值分析

银杏(Ginkgo Biloba L.)在中国有悠久的栽培历史。通过综合国内有关资料。从银杏的适应能力、应用价值和经济效益等方面，详尽阐述了近几年银杏栽培迅猛发展之原因，指明其发展趋势，给人们在今后的银杏栽培及开发利用方面以启迪。     

超结瘤大豆和东引3号大豆形态特征及蛋白质电泳比较

本文比较超结瘤大豆和东引3号大豆生育期、形态特征及蛋白质电泳的差异.结果表明,两个品种在生长发育期、形态特征以及蛋白质电泳图谱上都存在较大差异.     

关于探究自然选择对基因频率影响的讨论

讨论自然选择对基因频率影响的探究活动中的情境创设和计算方法,建议将这一探究活动转为课外科技活动,用Excel工具探究基因频率在自然选择下的变化。     

Effect of growing media and their constituents on fungus gnat, Bradysia sp, nr, coprophila （Lintner） adults

This study was conducted to determine the attractiveness of two growing media, commonly utilized in greenhouses, to fungus gnat, Bradysia sp. nr. coprophila adults. The constituents of the most attractive growing medium tested were determined by gas chromatography analysis using a steam-distillation procedure. We found that fungus gnat adults were more attracted to the growing medium, SB300 Universal Professional Growing Mix, which contains composted bark, than to another growing medium （Sunshine LC1 Mix） and their components when tested in a series of laboratory experiments using multiple-choice experimental arenas. A higher percentage of fungus gnat adults were attracted to moist SB300 （92%） than SB300 growing medium that had been oven dried （8%）. In addition, fungus gnat adults preferred SB300 although they had been reared on Sunshine LC1 Mix. When comparing the SB300 fresh from the bag to growing medium that had been pasteurized and moistened with water, gas chromatographic-mass spectroscopic data showed there were declines in several terpenoid constituents as well as an increase in fatty acids and cyclosulfur. The results of this study indicate that B. sp. nr. coprophila adults prefer certain growing media, which may assist greenhouse producers in managing fungus gnats in crop production systems.