Subjects: Biology >> Botany >> Applied botany submitted time 2024-04-17 Cooperative journals: 《广西植物》
Abstract： Expansin (EXP) plays an important role in plant response to environmental stress by regulating cell wall relaxation. To explore the role of EXP genes in soybean response to abiotic stress, two soybean EXP genes (GmEXPB5 and GmEXPB7) and their protein sequences were analyzed by bioinformatics, and their expression levels were detected by real-time fluorescent quantitative PCR (qRT-PCR). The results were as follows: (1) The GmEXPB5 and GmEXPB7 were located on chromosomes 10 and 12 of soybean, and encoded proteins containing 272 and 267 amino acids, respectively. The molecular weight of GmEXPB5 protein was 29.07 kD and the theoretical isoelectric point was 7.51. The molecular weight of GmEXPB7 protein was 29.09 kD and the theoretical isoelectric point was 8.66. Both GmEXPB5 and GmEXPB7 were stable hydrophilic proteins localized in the cell wall. Both GmEXPB5 and GmEXPB7 proteins contained a signal peptide sequence and a conserved DPBB_1 domain. (2) GmEXPB5 was closely related to CaEXPB15 of chickpea, and GmEXPB7 was closely related to EXPB3 of chickpea, red bean and cowpea. (3) GmEXPB5 and GmEXPB7 were expressed in soybean roots, stems and leaves, and their expression levels in roots and leaves were significantly higher than those in stems. (4) GmEXPB5 and GmEXPB7 could respond to salt, drought and cold stresses in soybean seedlings. (5) The promoter region of GmEXPB5 contained two types of stress-related cis-elements (ABRE and ARE). The promoter region of GmEXPB7 contained five types of stress-related cis-elements (ABRE、ARE、CGTCA-motif、TC-rich repeats and MBS). These results indicated that GmEXPB5 and GmEXPB7 could participate in the response of soybean to abiotic stress.
Subjects: Biology >> Botany >> Applied botany submitted time 2024-02-07 Cooperative journals: 《广西植物》
ZHANG Yong
MA Yandan
ZHENG Qiuzhu
SU Derong
DONG Shikui
LIANG Kemin
WU Kaiting
YUE Haitao
WANG Xiaorong
Abstract： This study aimed to investigate the effects of environmental disturbances on the stoichiometry characteristics of plants in degraded alpine meadows. To achieve this, a mowing experiment was conducted on an alpine meadow with three degradation levels (i.e., light degradation LD, moderate degradation MD, and severe degradation SD) in Shangri-La from 2018 to 2020. Subsequently, differences in plant carbon (C) content, nitrogen (N) content, phosphorous (P) content, C:N:P ratio, and N-P power function relationship among different mowing durations (i.e., 0 a, 1 a, and 2 a, respectively) were analysed. The results were as follows: (1) Except for the P content of Cyperaceae, plant C, N and P of the entire community, Gramineae and forbs did not vary among degradation levels (P > 0.05) during the mowing experiment. Plant C, N and P tended to increase and then decrease with increasing mowing years, i.e., these indices were the highest after 1 a of mowing (P < 0.05). (2) At the community and functional group levels, there was no significant difference in plant C:N ratio and C:P ratio among degradation levels (P > 0.05). From LD to SD, the N:P ratio of the plant community, Cyperaceae and forbs tended to increase (P < 0.05), while the N:P ratio of Gramineae did not change significantly (P > 0.05). (3) The N:P ratio showed a parabolic trend, while the C:N ratio and C:P ratio showed an inverse trend with increasing mowing duration. Before mowing (i.e., mowing 0 a), the C:P ratio and N:P ratio of Cyperaceae were higher than those of forbs (P < 0.05) but did not vary from those of the plant community and Gramineae (P > 0.05). After mowing (i.e., mowing 1 a or 2 a), the C:P ratio and N:P ratio of Cyperaceae were higher than those of the whole plant community, Gramineae, and forbs (P < 0.05). At each mowing duration, the C:N ratio of plants did not vary among plant communities and functional groups (P > 0.05). (4) Mowing caused a stronger N-P power function relationship and a stable power exponent both at the plant community and functional group levels. And the N-P power exponent of Cyperaceae was less than 0.1, while that of the plant community, Gramineae and forbs remained stable at 0.19-0.22. In conclusion, this study found that plant stoichiometry remained stable across degradation levels but changed significantly with the prolongation of the mowing duration. This implies that different degraded alpine meadows in Northwestern Yunnan Province may share common response mechanisms to mowing disturbance.
Subjects: Medicine, Pharmacy >> Clinical Medicine submitted time 2023-12-06 Cooperative journals: 《中国全科医学》
Abstract： Background As a neurodegenerative disease，Alzheimer's disease（AD） has a high incidence rate and rapid development，which seriously affects the quality of life of patients. In recent years，research on music therapy intervention in AD has gradually increased，lacking effective systematic evaluation and analysis. Objective A meta-analysis was conducted on the intervention effects of music in the treatment of cognition，emotion，living ability and sleep disorders in AD patients. Methods A randomized controlled trial was conducted on the intervention effect of music therapy methods on Alzheimer's patients in the Chinese Journal Full Text Database（CNKI），Wanfang Database（Wanfang），VIP Database（VIP），Medline，Elsevier ScienceDirect，PubMed，and Embase by computer search. The search time was from the establishment of each database until February 2023，and the data was analyzed using Review Manager 5.4 software. Results The study included 15 RCT studies with a total of 1 077 patients. The results of meta-analysis showed：The effects of music therapy on cognitive function（MD=4.35，95%CI=1.64 to 7.05，Z=3.15，P=0.002），negative emotion（SMD=-0.71，95%CI=-1.26 to -0.15，Z=2.51，P=0.01），life ability（SMD=-0.91，95%CI=-1.55 to -0.27，Z=2.77，P=0.006） The effect of intervention was better than that of control group. There was no significant difference in sleep disorder intervention between the two groups （MD=-1.04，95%CI=-3.10 to 1.02，Z=0.99，P=0.32）. Subgroup analysis showed that The treatment period was <12 weeks （P=0.01），the treatment duration was <45min/ time（P=0.02），the treatment frequency was ≥ 3 times/week（P<0.001），the implementation method was individual（P<0.001），the implementation method was individual + group（P=0.002），and the intervention measure was receiving music therapy（P<0.001） The effect of intervention on cognitive function in the group was better than that in the control group. Treatment period ≥ 12 weeks（P=0.004），treatment frequency <3 times/week（P=0.01），implementation method of individual + group（P=0.02），intervention measure of receiving music therapy（P=0.002），intervention measure of active music therapy（P=0.002），the intervention effect of music intervention group on negative emotions was better than the control group. Conclusion Music therapy can improve the cognitive function，mental state，and daily self activity of Alzheimer's patients. However，due to the low quality of case studies included，more large-scale and high#2;quality evidence-based studies are still needed to verify.
Subjects: Psychology >> Developmental Psychology submitted time 2023-03-28 Cooperative journals: 《心理科学进展》
Abstract： In recent times, various tragedies caused by unethical pro-organizational behavior (UPB) — that is, unethical behavior with the intention to potentially benefit the organization, but harm the interests of external stakeholders instead—are proliferating. The existing studies on UPB predominately focus on identifying its antecedents and pro-organizational aspects, ignoring its potential negative outcomes. Given this theoretical gap, the negative effects of UPB from a multilevel perspective are explored. First, the effect of UPB on exhaustion is explored; the moderating effect of moral identity and mediating effect of guilt are examined as well. Second, a firm-level UPB definition is created, and its negative effect on the firm’s long-term performance as well as the mediating role of corporation reputation are examined. Finally, the influence of the firm’s and employees’ UPB on customers' voluntary performance is analyzed, as well as the mediating effect of customer identification on the company and the moderating role of the perceived corporation agent role of employees. The results of this project will not only enrich the theoretical study related to UPB, but also help to discourage the practice or escalation of this kind of unethical behavior.
Subjects: Psychology >> Social Psychology submitted time 2023-03-27 Cooperative journals: 《心理学报》
Abstract： Owing to their distinctive nature, challenge stress and hindrance stress may have different effects on individual creativity. Drawing on social cognitive theory perspective, we conducted a longitudinal empirical study concerning with the relationship between challenge stress and hindrance stress and employees’ self-efficacy and creativity. We also examined whether these relations were moderated by distributive justice and procedure justice. Data were collected from 256 dyads of employees and their immediate supervisors in two divisions of a large enterprise. The questionnaire for employee in Time 1 included challenge stress and hindrance stress, job complexity, and demography variables. The questionnaire for employee in Time 2 included self-efficacy. Employees’ creativity was rated by their immediate supervisors in Time 3. Theoretical hypotheses were tested by hierarchal regression analysis with Mplus 6.0. Results of analyzing the matched sample showed that the relationships between challenge stress and both self-efficacy and creativity were not significant, and the relationship between hindrance stress and both self-efficacy and creativity was negative; where distributive justice was high, challenge stress was positively related to creativity via self-efficacy, whereas where distributive justice was low, this indirect relationship was not significant. The moderating effects of procedure justice on the relationship between hindrance stress and both self-efficacy and creativity were not significant. Extending previous studies, this research demonstrated that challenge stress and hindrance stress have unique influences on self-efficacy and creativity, the results clarified the relationship between stress and creativity in workplace from a new perspective. Second, by examining the mediating effect of self-efficacy, the results contributed to our understanding on the mechanism through which stress influence creativity. Finally, through investigating the moderating effect of procedure justice and distributive justice, we confirmed that there are bounded conditions of the effect of stress on employee creativity. Findings broaden understandings of the process by which and the conditions under which challenge stress and hindrance stress influence creativity. Furthermore, the results also revealed that social cognitive theory was more suitable for explaining the relationship between stress and creativity.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-19 Cooperative journals: 《金属学报》
Abstract： The fundamental theories for the development of high strength aluminum alloys and processing techniques for the materials are briefly reviewed in this paper. It specifically focuses on alloying design, casting, homogenization, solution treatment, quenching, pre-stretching and ageing that have been extensively studied recently. Based on these discussions, some perspectives and suggestions have been proposed, which will benefit the development and applications of high strength aluminum alloys.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract： The La0.6Pr0.4Fe11.4Si1.6B0.2 alloy was produced by using industrial grade raw materials. The phase constituents and thermal magnetic properties of the alloy were characterized by X-ray diffraction with Cu kα radiation and vibration sample magnetism respectively. The influence of hydrogen absorption pressure on magnetocaloric effect and hydrogen desorption process were investigated. Results show that the annealing treated alloy was subjected to hydrogenation at 0.13 and 0.2 MPa, correspondingly its Curie temperature increased to 320 and 321 K respectively. The taking place of dehydrogenation was much easier for the alloy hydrogenated at lower absorption pressure rather than that at higher pressure. The Curie temperature of the alloy hydrogenated at 0.13 MPa and then dehydrogenated at 473K could lower to room temperature range, correpondingly the maximal magnetic entropy of the hydrides decreased while the relative cooling power were increased.
Subjects: Mechanics >> Applied Mechanics submitted time 2022-12-21 Cooperative journals: 《应用力学学报》
Abstract：
Rock mass in cold regions is often affected by the combined effects of dynamic loading and low temperature; therefore,it is of great importance to study the dynamic mechanical response of rocks under low temperature conditions for geotechnical construction in cold regions.First,the water-saturated siltstone specimens were frozen to different negative temperature levels(from -10 ℃ to -50 ℃),and then dynamic impact tests were carried out on the water-saturated specimens at low temperatures using the split Hopkinson pressure bar(SHPB)system to study the changes in the deformation characteristics and mechanical properties.Finally,the dynamic constitutive model of frozen siltstone considering the strain rate and low temperature effect was established.The results show that the crack closure strain of the specimen increases with the increase of strain rate,while the elastic strain and plastic strain do not change significantly with the strain rate.The dynamic elastic modulus and compressive strength show a trend of increase and then decrease with the decrease of the sub-zero temperature,and reach the maximum value at -30 ℃.The mechanical properties of frozen rocks depend on the content of water/ice mixture inside the frozen siltstones and the resulting combined weakening and strengthening effects.The proposed constitutive model considering the strain rate and low temperature effects can better fit the full stress-strain relationship of frozen siltstone strain rate(>150 s-1).
Subjects: Astronomy >> Astrophysical processes submitted time 2021-09-29 Cooperative journals: 《天文研究与技术》
Abstract：三维升降转台是高海拔宇宙线观测站(LHAASO)广角切伦科夫望远镜阵列(WFCFA)成像激光雷达标定系统的核心组成部分，主要由慢控子系统、机械子系统和标准零点子系统构成，用于精确控制激光束的出射方向。本文采用高精度数字图像处理技术对三维升降转台的性能进行研究，结果表明其旋转和升降定位精度分别为0.005°和0.056 mm、重复精度分别为0.003°和0.075 mm，满足成像激光雷达标定系统的实验要求。三维升降转台的自动控制巡航功能，有效减少了人工干预，提高了系统远程使用的可靠性和效率。标准零点的校准功能可以有效地监测三维升降转台的定位精度并且在失准的情况下，能够实现远程校准，以确保三维升降转台长期高精度稳定运行。
Subjects: Psychology >> History of Psychology submitted time 2020-04-27
Abstract： " "
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Geography submitted time 2020-01-06 Cooperative journals: 《干旱区地理》
Abstract：喀喇昆仑山区冰川由于存在正物质平衡或跃动、前进现象，被称之为“喀喇昆仑异常”，不过该地区冰川变化差异显著，尤其是大型表碛覆盖冰川，呈现与其他类型冰川明显的差异性响应，为理解喀喇昆仑冰川异常的机理，冰川尺度的详细变化研究十分必要。音苏盖提冰川位于喀喇昆仑山乔戈里峰北坡，是中国面积最大的冰川，是典型的大型表碛覆盖冰川。通过应用TanDEM-X/TerraSAR-X（2014年2月）与SRTM-X DEM（2000年2月）的差分干涉测量方法计算音苏盖提冰川表面高程变化，并结合冰川表面流速对冰川表面高程变化和跃动进行分析和讨论。结果表明：2000—2014年音苏盖提冰川表面高程平均下降了1.68±0.94 m，即冰川整体厚度在减薄，年变化率为-0.12±0.07 m·a-1。冰川表面高程变化分布不均，其中南分支（S）冰流冰川整体减薄较为显著，冰川南分支冰流运动速度较快，前进/跃动的末端占据了冰川的主干，阻滞原主干冰川物质的向下运移（跃动），导致原主干冰舌表面高程上升；冰川厚度减薄随着海拔升高先下降后保持稳定，同时呈现一定的波动性；低海拔表碛区域消融大于裸冰区，可能存在较薄表碛，因热传导高、覆盖大量冰面湖塘和冰崖存在，加速了冰川消融；在坡度小于30 °的区域，冰川厚度减薄随着坡度的减小而加剧；坡向朝南冰川厚度略微增加（0.01 m），西南坡向冰川厚度略微减薄（-0.03 m），其他坡向冰川厚度减薄明显。近14 a来，表碛覆盖的音苏盖提冰川表面高程整体下降表明物质处于亏损状态，冰川跃动导致局部冰川表面高程的增加。
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-09 Cooperative journals: 《干旱区研究》
Abstract：以吉兰泰荒漠绿洲过渡带为研究区，通过对不同生境条件下的白刺（Nitraria tangutorum）灌丛沙堆形态特征、各形态参数间关系及白刺灌丛生长特征进行定量分析。结果表明：① 随着梭梭（Haloxylon ammodendron）林龄的增加（白刺纯林除外），白刺灌丛沙堆各形态参数变化范围较大，并向长椭球形方向发展，部分向不对称“蝌蚪状”方向演化。② 4种不同生境条件下，白刺灌丛沙堆各形态参数相关系数均在0.782以上（P0.721 7）和幂函数、二次函数关系（R2>0.835 1）且斜率均为正，表明4种生境灌丛沙堆均处于发育阶段。④ 白刺灌丛株高和盖度对灌丛沙堆形态特征有明显影响，即白刺灌丛株高越高、盖度越大，白刺灌丛沙堆高度、底面积和体积也逐渐增大。
Subjects: Energy Science >> Engineering of Energy Sources System Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-07-09
Abstract： The challenges of multi-area power system optimal dispatch exist on how to be in line with certain dispatching mode as well as on the modeling/solution. In this article, a multi-area system day-ahead scheduling, with a provincial systems-reducing method and a generation variances-minimizing objective, is proposed, based on the hierarchical dispatching organization and the long-term bilateral energy contract mode in China. Non-iteratively, the sub-optimal scheduling of ac/dc tie-lines and independent generation units can be derived from solving the model, which also considers some practical constraints like discrete constraints of dc power profiles and power flow limits of local ac interface, etc. Case study is carried out based on the realistic data from the multi-area hybrid ac/dc southern China power system, to verify the effectiveness and feasibility of the proposed model. It is demonstrated that with this method, the upper-level dispatching institution can generate an optimized and reliable transmission power plan with limited information, which decreases the peak-valley difference and standard variance of generation series, relieves the burden of peak regulation of its sub-systems, and hence improves the economic efficiency. The approach suits the dispatching mode of power systems in China well, handles various operation scenarios, and thus has been implemented in the system operator.
Peer Review Status:Awaiting Review
Subjects: Biology >> Bioengineering submitted time 2018-12-16 Cooperative journals: 《中国生物工程杂志》
Abstract：目的：优化AMPs17重组蛋白的原核表达条件，分析重组蛋白的抗真菌活性。方法：比较不同的诱导温度(25 ° C, 28 ° C, 30 ° C, 32 ° C, 34 ° C)、异丙基硫代-β-D半乳糖苷(IPTG)诱导浓度（0.025、 0.05、0.1、0.3、0.5、0.8、1.0mmol·L-1）和诱导时间（12h、15h、18h、21h、24h）对AMPs17重组蛋白表达量的影响，筛选AMPs17重组蛋白的最佳表达条件；采用镍离子金属螯合剂亲和层析柱对重组蛋白进行纯化，SDS-PAGE电泳和ImageJ图像分析系统对表达结果进行分析，Western bolt对AMPs17重组蛋白鉴定，高效液相色谱分析重组蛋白的纯度，微量液体稀释法及菌落计数法检测其抗真菌活性。结果：在诱导温度为32℃、IPTG浓度为0.05mmol·L-1的条件下诱导培养15h，AMPs17重组蛋白的表达量最高且最为稳定；HPLC色谱仪分析显示AMPs17重组蛋白纯度可达到90％以上；优化后的AMPs17重组蛋白能有效抑制白色念珠菌的生长。结论：本研究优化了家蝇抗菌肽AMPs17的诱导表达条件，获得了高表达、稳定且具有抗真菌活性的蛋白，为后续抗菌机制及应用研究提供一定的实验基础。
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-05-02 Cooperative journals: 《计算机应用研究》
Abstract： Aiming at the excessive location error caused by heterogeneous terminal (fingerprint database terminal and test terminal) in WLAN indoor localization system, a solution based on DBSCAN-GRNN-LSSVR algorithm is proposed. In this paper, the least square support vector regression (LSSVR) algorithm is employed to build the mapping relationship model between the received signal strength (RSS) of fingerprint database terminal and physical coordinate locations. The scatter plot is obtained through listing the RSS values collected by the fingerprint database terminal and the test terminal at the calibration point. The boundary points and noise points are eliminated by density-based spatial clustering. Generalized regression neural network (GRNN) is used to construct the heterogeneous terminal mapping function of the RSS. The LSSVR model is used to determine the location of the test point. Proved by experiment, compared with LSSVR algorithm, using the proposed DBSCAN-GRNN-LSSVR algorithm to calibrate the heterogeneous terminal, test terminal positioning accuracy increased by 18-40%, which effectively solves the problem of excessive localization deviation caused by heterogeneous terminals.
Subjects: Biology >> Bioengineering submitted time 2018-04-19 Cooperative journals: 《中国生物工程杂志》
Abstract：SpyCatcher和SpyTag可通过自发反应形成共价键，产生稳定的分子自组装体。酶分子自组装体因具有高效有序的催化特性在合成生物学和纳米技术领域具有重要的应用价值。为探索SpyTag/SpyCatcher在大肠杆菌胞内多酶复合体系形成有序自组装分子能力，将SpyCatcher和SpyTag分别与P450BM3m单加氧酶和葡萄糖脱氢酶GDH进行融合表达，以期产生具有辅酶再生循环系统、高效生物合成靛蓝分子的SpyTag/SpyCatcher双酶自组装复合体。首先，通过电泳及质谱对重组工程菌表达蛋白进行分析，证实SpyCatcher-P450BM3m与SpyTag-GDH在胞内成功形成了自组装多酶复合体；然后，系统分析了不同培养条件下组装体合成靛蓝的能力，结果发现，经0.5mmol/L IPTG诱导后，菌体在16 ℃继续培养18 h后，工程菌对吲哚（2 mmol/L）与葡萄糖（4 mmol/L）的全细胞催化能力最强，靛蓝产量最高达258 mg/L，是未组装多酶系统的1.9倍，比P450BM3m单酶表达系统高约2.4倍；反应70 min后达到反应平衡，转化率为52%。本研究成功实现了SpyTag/SpyCatcher介导的多酶体系在大肠杆菌细胞中的自组装和高效转化体系，为胞内多酶复合物组装体的设计提供了新思路。
Subjects: Biology >> Zoology submitted time 2017-10-23 Cooperative journals: 《动物营养学报》
Abstract：动物的采食量在实际生产中起着重要的作用。因仔猪对鲜味的偏爱，所以常在仔猪饲料中添加鲜味剂以提高仔猪的采食量。鲜味剂提高仔猪采食量的主要途径是通过刺激其味觉，从而促进口腔和胃肠道中的激素等分泌，以增加其对饲料的采食。本文从鲜味剂对猪味觉的调控进行阐述，旨在为鲜味剂在仔猪饲料中的应用提供理论依据。
Subjects: Biology >> Zoology submitted time 2017-10-11 Cooperative journals: 《动物营养学报》
Abstract：动物的鲜味受体包括代谢型谷氨酸受体（mGluR）和味觉受体异源二聚体（T1R1/T1R3），是C型G蛋白偶联受体，N末端捕蝇草模块（VFT）区域可与鲜味配体结合，识别鲜味。本文主要论述了鲜味受体的研究进展、鲜味识别转导机制及鲜味受体基因的表达调控等，以期为相关研究提供参考。
Subjects: Biology >> Zoology submitted time 2017-10-11 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在探讨饲粮中添加三丁酸甘油酯（TB）和牛至油（OEO）对断奶仔猪生长性能、血清生化指标、营养物质表观消化率和粪中微生物菌群的影响。试验选用28日龄平均体重为（7.27±0.68） kg的健康大白断奶仔猪128头，随机分成4组，每组4个重复，每个重复8头猪。各组分别饲喂基础饲粮（对照组）、基础饲粮+1 kg/t TB（TB组）、基础饲粮+1 kg/t OEO（OEO组）、基础饲粮+1 kg/t TB+1 kg/t OEO（TB+OEO组）。试验期28 d。结果表明：1）与对照组相比，OEO组显著提高了断奶仔猪平均日增重（P0.05）。3）与对照组相比，TB+OEO组显著提高了断奶仔猪粗蛋白质表观消化率（P<0.05），极显著提高了粗脂肪表观消化率（P<0.01）。4）与对照组相比，TB组、OEO组和TB+OEO组均极显著降低了粪中大肠杆菌的数量（P<0.01）；TB+OEO组显著提高了粪中双歧杆菌的数量（P<0.05）。综上所述，基础饲粮中添加TB+OEO可提高断奶仔猪生长性能，改善营养物质表观消化率，调节肠道菌群平衡。
Subjects: Biology >> Zoology submitted time 2017-10-10 Cooperative journals: 《动物营养学报》
Abstract：调控猪各个阶段的采食量是动物营养研究的热点问题。风味剂主要有香味剂、甜味剂、鲜味剂，可以改善饲粮的适口性，提高猪对饲粮的喜爱程度，也可以缓解因环境变化、饲料原料改变等应激反应导致的采食量下降。猪的嗅觉系统特别发达，灵敏度很高，味觉也要比人类敏感，因此在饲粮中添加风味剂主要通过刺激猪的嗅觉和味觉来使摄食中枢兴奋，进而促进猪采食。本文综述了饲粮中添加风味剂对猪采食量的影响及其作用机理，为相关试验提供理论依据。
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