夏海黄三元杂种牛生长发育研究

测定分析了夏海黄三元杂交后代（公牛３４头，母牛３７头）与豫北黄牛及海黄Ｆ１初生－２４月龄体尺与体重均较豫北黄牛有较大幅度提高，较海黄Ｆ１提高明显，利用夏海黄三元杂交发展肉牛生产是一条有效途径。     

欧洲赤松—云杉混交林分生长的研究

1966年在苏联弗拉基米尔州设立了“自然纪念林”固定标准地。该林分为Ⅰ_a地位级的单层混交天然林。组成为8松2云,林分年龄150年(松树),每公顷蓄积为927.1 m~3,其中用材占93.3％,木材剩余物占6.4％,薪材占0.3％。用材中98％可造锯材,2％造矿柱。经过15年,林分组成和地位级仍与期初相同。欧洲赤松平均树高增长1.3m;但云杉变化很小。欧洲赤松和云杉平均直径分别增长0.8和1.6 cm。林分内林木虽有枯死,但“自然纪念林”林分仍具有很高生产力,是俄罗斯珍贵的森林。     

西农萨能奶山羊血浆生长激素水平的变化及其与奶产量的关系

本实验用放免测定法(RIA)测定了38只西农萨能奶山羊(其中360～450日龄的青年羊10只,产前一月至产后90天的头胎和2胎羊各14只)血浆GH水平变化,分析了血浆GH水平与奶量的相关性。结果表明:360～450日龄的青年羊血浆GH维持在一个波动较小的范围(20.37±5.17～23.13±5.97ng/ml),头胎羊和二胎羊分娩前后及泌乳早期血浆GH水平的变化趋势相一致,在同一生理状态下,二胎羊血浆GH水平都显著地高于头胎羊。相关分析还表明:头胎羊和二胎羊血浆GH水平都与其奶量呈直线正相关关系(P<0.05)。综上结果可以认为,奶山羊血浆GN水平可作为选育高产奶山羊的一项指标。     

除污器堵塞对供暖系统的影响

作者结合工程实例,分析除污器堵塞现象对供暖系统的影响,提出应定期清理。     

马尾松基因库无性系花期观察分析

在福建省沙县官庄林场石景山工区进行马尾松基因库无性系开花习性、花量、花期的观察。观察结果表明：不同无性系着生球花量的差异显著，始花期也有明显的差异，但也存在一定的同步性，大部分无性系雌花开放时间比雄花早４─９天。     

抗牛布鲁氏菌独特型抗体杂交瘤细胞（Ｆ９）的生长和代谢

用RPMI1640培养基对抗牛布鲁氏菌独特型抗体杂交瘤细胞株(F9)进行培养，并对其生长代谢进行测定。该细胞不论接种1.1×10     

植物根际促生菌普城沙雷菌A21-4对黄瓜生长及土壤微生态的影响

为探讨植物根际促生菌普城沙雷菌A21-4在黄瓜上的应用效果,将A21-4菌悬液灌注到黄瓜根际土壤,调查其对黄瓜生长发育和根际土壤微生态的影响。结果表明,根部灌注A21-4能显著促进苗期和田间生育期黄瓜生长发育,并显著提高根系活力、产量和品质,黄瓜产量比对照增加32.22%,且黄瓜果实中蛋白质、可溶性糖和VC含量均比对照显著增加;同时,A21-4对黄瓜根际土壤具有明显的调节作用,显著提高了黄瓜根际土壤脲酶、磷酸酶、蔗糖酶和过氧化氢酶活性,还提高了黄瓜根际土壤细菌和放线菌的数量及黄瓜根际土壤速效氮、磷、钾的含量。     

基于作物长势实时监测的日光温室物联网系统研究

为了解决日光温室环境监测与调控缺乏科学生长模型和数据支撑的问题,开展了基于作物长势实时监测的日光温室物联网系统的研究和应用案例分析。应用案例表明:将日光温室环境智能监控和作物的长势监测信息相结合能够科学地反映作物的生长情况和作物在不同生长阶段对环境的要求,为下一步制定科学的作物生长调控决策模型提供参考。     

Milk compositional changes of Laoshan goat milk from partum up to 261 days postpartum

Despite the global increasing demand for goat milk, no data exist on the nutrient potential of Laoshan goat milk and limited information exists on its composition according to lactation period. In this study, the measured indicators, including dry matter, protein, immunoglobulin, lactoferrin, fat, ash, lactose, calcium, titratable acidity and pH from partum to 261 days postpartum of Laoshan goat milk, followed the same law of change. There was a significant difference over the first 5 days postpartum, after which no significant difference was observed until days 225 postpartum. However, days 255 postpartum was like a turning point, after which their values showed either an increasing or decreasing trend. We concluded that the colostrum for Laoshan dairy goat was considered from days 1 to 5 postpartum and after 5 days it was as transitioned to milk when all measured parameters were according to the normal ranges as described in this study. This work provided updated information on the current nutritive characteristics of Laoshan goat milk, which may be of importance in the fields of milk production, food technology, and nutritional mutual replenishment.     

Invertebrate drift densities in the Njoro and Kamweti Rivers in the Kenyan highlands that differ in the level of anthropogenic disturbances

Invertebrate drift is one of several fundamental ecological processes in streams. However, little is known about the dynamics of invertebrate drift in Kenyan streams. In this study, we assessed invertebrate drift in two rivers, i.e. Njoro and Kamweti, that differ in the level of anthropogenic disturbances, between February and March, 2016. The aim was to evaluate the effect of river sampling duration (5, 10, 15, 20 and 25 min) and sampling period (day or night) on invertebrate drift densities. The 5-minute sampling period resulted in significantly higher mean drift densities than the other time intervals in both rivers. The highest mean drift density (2.0 ± 0.9 individuals m^?3) was recorded at the Njoro River during the day, whereas the lowest drift density (0.3 ± 0.2 individuals m^?3) was recorded at the Kamweti River during the day. A strong nocturnal drift pattern was noted at the less disturbed river (Kamweti). The present results suggest that anthropogenic perturbations influence invertebrate drift densities, and sampling duration and sampling period are important factors to consider when sampling invertebrate drift.