丝素、丝胶质量标准指标的研究

为进一步制订丝素和丝胶的质量标准,并用以指导蚕丝蛋白规范生产,检测分析了丝素与丝胶中的氨基酸含量、干燥失重和灰分等质量指标,砷、铅等重金属含量的安全性指标,以及菌落总数、大肠菌群和致病菌等微生物指标。参照食品、化妆品等国家标准限量规定,结合蚕丝蛋白的特性和生产制备现状,初步提出了评价丝素与丝胶质量优劣的指标及相应的数值范围。     

氨基酸螯合锌在奶山羊肠道消化吸收规律的研究

本试验旨在研究氨基酸螯合锌(Zn-AA)在奶山羊体内的消化吸收规律及其在饲粮中的适宜添加水平.试验选取2.5～3.0岁,体重40～45 kg的关中奶山羊母羊6只,安装永久性瘤胃、十二指肠及回肠瘘管,首先从瘤胃灌注40 mg/kg的Zn-AA溶液,分别在灌注后的24、48、72、96、120、144和168 h采集十二指...     

Zinc‐bearing zeolite clinoptilolite improves tissue zinc accumulation in laying hens by enhancing zinc transporter gene mRNA abundance

A study was conducted to investigate effects of zinc‐bearing zeolite clinoptilolite (ZnCP), as an alternative for zinc sulfate (ZnSO₄), on laying performance, tissue Zn accumulation and Zn transporter genes expression in laying hens. Hy‐Line Brown laying hens were allocated to three treatments, each of which had six replicates with 15 hens per replicate, receiving basal diet supplemented with ZnSO₄ (control, 80 mg Zn/kg diet), 0.23% ZnCP (40.25 mg Zn/kg diet) and 0.46% ZnCP (80.50 mg Zn/kg diet) for 8 weeks, respectively. Compared with control, hens fed diet containing 0.23% ZnCP had similar Zn content in measured tissues (P > 0.05). A higher ZnCP inclusion (0.46%) enhanced Zn accumulation in liver (P < 0.05) and pancreas (P < 0.05). In addition, ZnCP inclusion increased blood iron (Fe) content (P < 0.05). ZnCP supplementation enhanced jejunal metallothionein‐4 (MT‐4) messenger RNA (mRNA) abundance (P < 0.05). ZnCP inclusion at a higher level (0.46%) increased mRNA expression of MT‐4 in pancreas (P < 0.05) and zinc transporter‐1 (ZnT‐1) in jejunum (P < 0.05). The highest ZnT‐2 mRNA abundance in jejunum was found in hens fed 0.23% ZnCP inclusion diet (P < 0.05). The results indicated that ZnCP reached a higher bioavailability as compared with ZnSO₄ as evidenced by enhanced tissue Zn accumulation and Zn transporter genes expression.     

马占相思胶合板,单板贴面人造板,实木家具研制及栲胶浸提的试验

用９年生马占相思的木材研制胶合板，装饰单贴面人造板，家木家具和用树皮浸提栲胶的试验结果表明，其大径级木材纹理美丽、密度中等、胶粘性好、胶合强度高，适宜制度胶合板、装饰贴面人造板，且质量合格；制造白 实木家具外观美丽且实用；其树皮可浸提要，含量达１９．７２％－２１．３０％，马占相思是一种具有较高的利用价值和开发潜力的工业用材树种。     

在农业产业化经营中实施品牌战略的研究

阐述在农业产业化经营中实施品牌战略的重要性、紧迫性,指出辽宁省农产品品牌发展现状及品牌创建中存在的主要问题,提出加快实施品牌战略的有效措施,以提升辽宁农业产业化经营水平,增加农民收入。     

A stable CH<Subscript>4</Subscript> sink responding to extreme precipitation events in a fenced semiarid steppe

Purpose

Climate models predict that amplification of the hydrological cycle results in more extreme (more intensive but less frequent) precipitation events (EPEs) that have larger effects on ecosystem functioning than mean precipitation conditions. Semiarid grassland ecosystems are considered important CH₄ sinks whose functioning is greatly affected by variations in precipitation patterns. An experiment was performed to assess the effects of extreme precipitation events on the functioning of a fenced semiarid steppe grassland on the Inner Mongolian Plateau of China.

Materials and methods

Extreme precipitation events (282 mm over 20 consecutive days) during the middle (Pm) and late (Ps) growing periods of 2014 were simulated to assess the effects of extreme precipitation events on the CH₄ uptake of the ecosystem.

Results and discussion

The extreme precipitation events had no significant effect on the CH₄ uptake rate during the growing season but did result in 62 and 45% reductions in the CH₄ uptake rate during the Pm and Ps events, respectively. There were legacy effects on suppression of the CH₄ uptake rate for approximately 40 and 35 days after the events in the Pm and Ps plots, respectively, but the suppression disappeared rapidly during the late season as a result of faster water loss. No significant differences in cumulative CH₄ uptake were detected between the treatment and the control plots over the growing season as a whole, which demonstrates that the ecosystem functions as a CH₄ sink. The average CH₄ uptake rates were found to be strongly regulated by changes in the soil water content.

Conclusions

The results suggest that the CH₄ uptake budget of this fenced steppe grassland can be maintained even in the face of consecutive extreme precipitation events, regardless of the timing of the events. Nevertheless, long-term experiments are needed to detect the thresholds for CH₄ uptake budget changes, in case of an increasing occurrence of EPEs in the future.

     

暗纹东方(鱼屯)生殖洄游期性腺发育特点及人工繁殖的研究

1996～1998年,作者从长江下游扬中段采捕暗纹东方亲鱼,经暂养促熟处理(微流水刺激、投喂鲜活饵料、不定期注射适量的LHRH-A2),雌鱼的性腺可发育到Ⅳ期末,对外源激素能引起正常的排卵反应.同时观察了Ⅲ、Ⅳ、Ⅴ期性腺发育的特点.催产药物为LHRH-A2和PG,三针注射,雌鱼剂量为3.5mgPG+60μgLHRH-A2/kg,雄鱼剂量减半.在水温18～22℃的条件下,效应时间为10～36小时;在21～22℃时,胚胎发育时间为139～210小时.1997～1998年的平均受精率为83.4%,平均孵化率为78.0%.     

高产杂交稻新组合Ⅱ优3003的选育与应用

高产杂交稻新品种Ⅱ优3003,系四川省宜宾市农科所水稻研究室1999年用三系不育系Ⅱ-32A,与优质重穗型强恢复系宜恢3003组配而成。2002年参加四川中籼迟熟B组区试,平均产量8.49t/hm2,比对照汕优63增产5.91%,居试验第一位;2003年参加四川省中籼迟熟A1组区试,平均产量8.246t/hm2,比对照汕优63增产3.92%,同年参加四川省生产试验,平均产量8.664t/hm2,比对照汕优63增产9.31%。该组合有株型佳,分蘖力强,稳产丰产,优质抗病,适应性好等特点,适应中国南方稻区的平坝、丘陵区及汕优63种植的地方种植。     

辽宁有机水稻栽培技术要点

有机水稻是效益较高、前景广阔的优势特色产业。分析辽宁有机水稻发展的主要原因,介绍有机水稻生产过程中营养土无纺布旱育苗、合理稀植、问题灌溉和病虫害综合防治等技术要点,为辽宁有机水稻生产提供技术指导。