大学食品科学与工程专业的多模态PPT教学研究

在介绍多模态的基础上,分析多模态PPT教学的优缺点,探讨如何有效将多模态PPT教学应用于大学食品科学专业教学中,对于大学生物科学专业教学具有重要的指导和建设意义.     

广州市儿童公园中植物科普教育类活动项目研究

通过研究广州市13个儿童公园中植物科普教育类活动项目的类型、管理形式、使用状况和使用评价,并结合广州家长及儿童对植物科普教育活动项目的偏好与需求调研结果分析,探讨该类型活动的组织模式和开展方式,总结成功的经验及存在的问题,提出丰富植物资源、规划科普场地、增加活动项目、完善公园管理、培训科普人员等完善建议。     

基于PBL的协同小组分工教－学法在草地保护学实践教学中的应用

以河北农业大学动物科技学院草业科学专业两届学生(实施不同实践教学方法)为例，在拓展实验教学途径、课程实践技能比赛、校外教学实习、企业家实践教学协同指导小组、创新草地保护学实习内容、实践教学信息化改革及课程评价体系等方面进行实践教学改革，在各教学环节实施基于PBL协同小组分工教–学法，探讨产、学、研、地协同背景下，团队协作学习为主的项目导向(project-based learning，PBL)教学法在草地保护学课程实践教学中的应用效果。结果表明：这种教学方法在很大程度上提高了学生考试成绩和教学质量，增强了学生综合专业实践素养，应在草地保护学教学中广泛推广。     

Characterization of Leptospira infection in suckling and weaning rat pups

Rats are known to be the most important reservoirs of Leptospira spp. However, the leptospiral dose and age at which rats become resistant to Leptospira infection are not yet well elucidated. Aimed to characterize leptospirosis in rat pups, we found that suckling pups (4-, 7-, and 14-day old) are susceptible to leptospires and resistance starts from the weaning age (23-day old). Susceptibility of rat pups was also affected by the infecting dose of the organisms. Jaundice, decrease in body weight, and neurological symptoms prior to moribundity was evident in infected suckling pups. However, 23-day-old infected pups did not manifest any pathological changes and were able to survive the infection similar to adult rats. Based on these results, we propose the suckling rat pup as a novel animal model of human leptospirosis to investigate pathogenesis, development of host resistance, and the mechanisms involved in rats becoming maintenance hosts for leptospires.     

国家农业科技园区农业科技创新服务平台设计

针对国家农业科技园区对科技创新服务平台的需求,该文提出了一种基于信息化技术的解决方法。该方法在可察、可考和可用的三重要求下,首先明确角色及其相互关系,规范了角色的业务需求和主要的业务流程。遵循设计的角色、需求和流程,系统开发部署后测试稳定、正常。可以有效支撑国家农业科技园区的相关科技活动。     

面向国际化的木材科学与工程专业英语教学反思及策略

随着当前国际化进程的日益推进,社会对木材科学与工程专业毕业生的专业英语水平提出了更高要求。通过反思当前木材科学与工程专业英语教学存在的问题,从教学目标、教学方法、教学手段、师资队伍和考核方式等方面提出了教学改革建议,为建立以社会需求为导向、以能力培养为目标的木材科学与工程专业教学体系提供指导。     

不同动物对醉马草种子扩散的影响

动物通过皮毛携带、搬运等方式对种子在空间上的扩散产生不同影响,是植物种子实现远距离扩散的重要途径。以草原毒害草醉马草（Achnatherum inebrians）为研究材料,采用野外模拟及控制性试验,测定了马、牛、羊皮毛附着和保留种子的能力,以及鼠类、蚂蚁对种子的搬运能力,分析动物对醉马草种子的扩散规律。结果表明,马、牛、羊模型种子的附着率：羊 > 牛 > 马（P<0.05）,种子掉落率：羊 < 牛 < 马（P<0.05）;随着行走天数的延长,种子在马、牛、羊皮毛上的附着率呈下降趋势。马的背部以及牛、羊的背、侧部最易附着种子;种子的侧部最易附着在皮毛上,以种子顶部附着的种子最不易掉落。24 h内鼠类、蚂蚁对种子的扩散范围分别为0~15 cm和0~40 cm。综上所述,家畜对醉马草种子起到远距离扩散作用,且羊比马、牛更容易增加种子的扩散强度。蚂蚁、鼠类对醉马草种子起到短距离扩散作用。     

Protein and energy concentrations of meat meal and meat and bone meal fed to pigs based on in vitro assays

The objective of this study was to develop equations for estimating ileal digestible crude protein (CP) and metabolizable energy (ME) contents of meat meal (MM) and meat and bone meal (MBM) as feed ingredients for pigs based on in vitro assays. Test ingredients were 4 sources of MM and 3 sources of MBM. Ash and CP contents of the ingredients ranged from 3.8% to 33.1% and 46.8% to 82.9% (as-is basis), respectively. In vitro ileal disappearance (IVID) of CP was determined and ileal digestible CP content was calculated by multiplying CP content by IVID of CP. In vitro total tract disappearance (IVTTD) of dry matter (DM) was determined and ME was calculated using gross energy, CP contents, and IVTTD of DM. The IVID of CP and IVTTD of DM ranged from 77.2% to 88.7% and from 82.7% to 92.4%, respectively. Calculated ileal digestible CP and ME contents ranged from 37.8% to 73.5% DM and 2,405 to 3,905 kcal/kg DM, respectively. Ash contents were negatively correlated (P < 0.001) with CP (r = −0.99), in vitro ileal digestible CP (r = −0.97), gross energy (r = −1.00), in vitro digestible energy (r = −0.97), and adjusted ME (r = −0.97). The most fitting equations for ileal digestible CP and adjusted ME were: ileal digestible CP (% DM) = 11.91 − 0.90 × Ash (% DM) + 0.74 × IVID of CP (%) (R² = 0.99) and adjusted ME (kcal/kg DM) = 130.85 − 50.90 × ash (% DM) + 47.06 × IVTTD of DM (%) (R² = 0.99). To validate the accuracy of the prediction equations for ME, mean bias and linear bias were determined using a regression analysis. Calculated ME values of MM and MBM were in a good agreement with data obtained from animal experiments based on a statistically insignificant bias in the models. In conclusion, ME concentrations of MM and MBM as swine feed ingredients can be calculated using ash concentration and in vitro disappearance of dry matter.