地质矿产点源信息系统的开发与应用

谈及到地质矿产点源信息系统，它的应用范围十分广泛，它的开发自然也是十分重要的一个项目。什么叫地质矿产点源信息系统，地质矿产点源信息系统由勘察数据管理，勘察数据处理和地矿资源预测评价三个部分组成的，其结构是技术方法与应用模型的层叠式复合结构，核心是点源主题数据库。这个系统主要应用于地质的勘测分析，建立于基层勘察单位的地质矿产点源信息系统把实现地质矿产勘察全过程数据资料采集，处理信息化等统一协调的放在一起，可以对地产的勘测等方面都有很大的帮助。     

盐胁迫对裸果木幼苗光合特性的影响

本研究以一年生裸果木幼苗为材料，采用盆栽育苗方式，设计7个不同浓度NaCl溶液（CK、0.2%、0.4%、0.6%、0.8%、1.0% 和1.2%）模拟盐分胁迫，测定分析了其叶片气体交换参数、光响应曲线及叶绿素荧光参数的变化规律。结果表明：随着盐浓度的增加，叶片净光合速率（P_n）、气孔导度（G_s）和蒸腾速率（T_r）均呈下降趋势，NaCl浓度≥0.4%时，各处理P_n、G_s和T_r均显著低于CK；气孔限制值（L_s）和瞬时水分利用效率（WUE）随盐浓度增加呈先升后降趋势，胞间CO₂浓度（C_i）呈相反趋势，NaCl浓度为0.4%时，L_s达到最大值，而C_i达到最小值，说明P_n下降以气孔限制因素为主，而当NaCl浓度≥0.6%时，以非气孔限制为主要因素。随着盐胁迫程度的增大，最大净光合速率（P_nmax）、暗呼吸速率（R_d）、光饱和点（L_SP）、表观量子效率（A_QY）逐渐降低，光补偿点（L_CP）逐渐增加，表明盐分抑制了幼苗对光的吸收、利用和转换能力。叶片PSII潜在活性（F_v/F₀）、原初光能转化效率（F_v/F_m）、实际光化学效率（Φ_PSII）、电子传递速率（ETR）和光化学猝灭系数（q_p）随着盐浓度的增加呈下降趋势；非光化学猝灭系数（NPQ）在≤0.4%NaCl处理下较CK显著增加，盐浓度≥0.8%时，NPQ显著下降。基质的NaCl浓度在0.2%和0.4%时，裸果木叶片P_n、F_v/F₀、F_v/F_m下降不显著，WUE有所提高，PSII系统可以通过耗散过剩的光能保护光合机构，表现出一定的耐盐性；但盐浓度超过0.6%时，光合生态幅变窄，光合机构受到明显破坏，显著抑制了光合作用能力。     

Effects of Lactic Acid Bacteria and Fructooligosaccharides on Growth Performance,Nutrient Digestibility and Serum Biochemical Indices of Arctic Foxes (Alopex lagopus) during Early Growth Period北大核心CSCD

This experiment was conducted to study the effects of dietary lactic acid bacteria (LAB) and fructooligosaccharides (FOS) on growth performance, nutrient digestibility and serum biochemical indices of Arctic foxes (Alopex lagopus) during early growth period. Sixty male post-litter Arctic foxes with the average body weight of (1.16±0.15) kg and at the age of (45±3) days were randomly assigned to 4 groups with 3 replicates per group and 5 foxes per replicate. The foxes were fed the following diets, respectively: basal diet (control group), basal diet+3×109 CFU / kg LAB (LAB group), basal diet+5 g / kg FOS (FOS group) and basal diet+3×109 CFU / kg LAB+5 g / kg FOS (LAB+FOS group). The experiment lasted for 30 days. The results showed as follows: 1) on the days 1 to 15, the diarrhea rate of foxes in the LAB group and LAB+FOS group was significantly lower than that in the control group and FOS group (P<0.05). On the days 16 to 30, the average daily gain of foxes in the LAB+FOS group was significantly higher than that in the control group and FOS group (P<0.05), but had no significant difference with LAB group (P>0.05); the diarrhea rate of foxes in the LAB+FOS group was significantly lower than that in the control group and FOS group (P<0.05), but had no significant difference with LAB group (P>0.05); compared with the FOS group, the feed to gain ratio of foxes in the LAB+FOS group was significantly decreased (P<0.05). 2) The dry matter digestibility of foxes in the LAB + FOS group was significantly higher than that in the control group and FOS group (P < 0.05), but had no significant difference with LAB group (P>0.05). There were no significant differences in nitrogen intake, fecal nitrogen, urine nitrogen, nitrogen deposition, net protein utilization and protein biological value among all groups (P>0.05). 3) Serum total protein (TP) content of foxes in the LAB+FOS group was significantly higher than that in the FOS group (P<0.05), but had no significant difference with control group and LAB group (P>0.05). Serum albumin (ALB) content of foxes in the LAB group was significantly higher than that in the control group and FOS group (P<0.05), but had no significant difference with LAB+ FOS group (P>0.05). Serum urea nitrogen (UN) content of foxes in the LAB+FOS group was significantly decreased compared with the control group (P < 0. 05). In conclusion, the combined supplementation of 3 × 109 CFU / kg LAB and 5 g / kg FOS in the diet is beneficial to reduce diarrhea rate, improve dry matter digestibility, improve body immune level, and promote the growth of Arctic foxes during early growth period. © 2023 Chinese Journal of Urology. All rights reserved.     

中草药复方添加剂在禽类生产中的应用

本文对中药饲料添加剂的作用、在禽类生产中的应用情况以及使用中存在的问题作一综述。     

单胃动物脂肪营养研究进展

Fat is an essential element for animal.The paper reviewed recent research progress on fat nutrition in monogastric animal at home and abroad, combining with the fat digestion and absorbing form in animal body, and summarized biological function and application of fat in production, so as to provide theoretical basis for better utilization of fat in animal production and exploration its mechanism of action.     

智慧农业 让山西农民挣更多的钱

<正>曾经全靠人工的农活儿,在机械、新技术的助力下,逐渐变得轻松。如今,智慧农业已不再是梦想。机械做记录农产品插上翅膀西红柿不是长在土里,而是在水里培养;稻田里,植保无人机在空中盘旋喷药;温室大棚的光线能自动调整,果蔬需要快速生长时光线直射,需要慢生长时则可斜射;扫二维码就能查到农产品的种子来源、施肥、用药情况……以上这一切不是未来,是山西已经实现了的智     

偃松播种育苗技术

偃松松籽具有很高的经济价值和广阔的市场前景,是林区企业、职工和群众创收致富的重要经济来源之一。由于多年的掠夺式采摘及森林火灾,资源破坏严重,数量逐年减少,自然条件下偃松球果结实率低、质量差,特别是偃松种子天然散布能力弱,仅靠自然更新根本无法恢复到原来的偃松林状态,培育优质偃松苗是有效恢复偃松林的关键。     

家蚕核型多角体病毒ie0基因对病毒复制和转录的影响

ie0基因是家蚕核型多角体病毒(BmNPV)的一个晚期基因,该基因编码氨基酸序列的高度保守性及多种结构域提示其在病毒感染过程中的重要性。利用Red同源重组技术,分别对BmNPV ie0基因编码不同结构域的序列以及完整序列进行敲除构建ie0缺失型病毒,以野生型病毒为对照,研究ie0序列完全或部分缺失对病毒转录、复制及对宿主细胞致病能力等方面的影响。结果表明ie0基因完整序列或编码各结构域的序列缺失后均会对病毒产生不同影响:宿主细胞中完全缺失型和部分缺失型病毒滴度均有不同程度降低;完全缺失型和部分缺失型病毒基因组的拷贝数均与野生型病毒无显著差异;部分缺失型病毒的晚期和极晚期基因转录水平变化与ie0基因完全缺失型病毒相一致,均显著低于野生型病毒,并且缺失锌指结构域编码序列的影响最为明显。MTT检测结果也显示ie0基因完全缺失后病毒对宿主细胞的致病能力有所下降。亚细胞定位显示IE0蛋白在细胞质、细胞核中均有分布,但主要位于细胞质。综上所述,ie0基因为BmNPV病毒增殖、基因组复制的非必需基因,但对病毒晚期和极晚期基因的转录具有调控作用,影响最为显著的为锌指结构域的编码序列,且该基因的缺失会导致病毒对宿主细胞的致病能力有所下降。