LFA—3和IL—2对机体免疫增强作用

以绵羊红细胞膜提取的ＬＦＡ－３和猪外周血单个核细胞所产生的ＩＬ－２，同时或分别与新城疫Ⅳ系疫苗胸肌注射２２日龄雏鸡，测定鸡体ＨＩ抗体效阶及Ｅｔｇ花环形成率的变化，结果表明，ＬＦＡ－３组抗体效价与对照组差异极显著，ＩＬ－２也可显著提高ＩＶ系苗免疫后ＨＩ抗体效价，且两者的作用具有剂量依赖性。     

LFA方法在晋西黄土区植被景观功能评价中的应用

 采用LFA(Landscape Function Analysis)方法,通过调查7种地类35组样本,评价植被类型、人类活动对林地景观功能和土壤性能的影响,并验证LFA方法在黄土区的适用性。结果表明:不同植被类型对林地土壤结构稳定性、渗透性能、养分循环性能的影响显著,其中,天然次生林改良土壤结构稳定性、渗透性和养分循环性能的作用最好,其次是刺槐人工林、油松人工林,荒草坡最差;人类活动对人工林地景观功能和林地土壤结构稳定性有显著影响;LFA方法能够较好地评价植被类型对林地土壤性能的影响,以及人类活动对人工林地景观功能和林地土壤结构稳定性的影响,在黄土残塬沟壑区有较好的适用性。     

天然LFA-3对于猪血清溶血作用和猪PBMC Et花环的影响

根据解离、吸收猪血清能够阻止正常猪血清对SRBC的破坏作用和猪PBMCE_1花环的形成,推断正常猪血清中存在天然的LFA—3,并从天然LFA—3与游离CD_2和膜CD_2的可能关系中提出了T淋巴细胞激活中游离CD_2调控途径的设想。     

LFA3降低大鼠血清胆固醇作用机理的探讨

以含ＬＦＡ３０（对照组）和１００ｇ／ｋｇ（试验组）日粮饲喂Ｗｉｓｔａｒ大鼠８周。试验组血清ＴＣ含量下降２３．４５％，ＨＤＬ－Ｃ上升７．０９％，肝ＴＣ下降４．５％。胆管插管，引流胆汁试验，试验组肝胆汁分泌量上升５１％。结果提示，ＬＦＡ３有较高的降血脂作用，这种作用可能同ＬＦＡ３能引起ＨＤＬ－Ｃ含量上升，肝脏对胆固醇代谢转化作用加强，以及通过增加胆汁分泌而加速胆固醇的排泄有关     

LFA方法在晋东采煤区景观结构及功能评价中的应用

煤炭开采区植被退化监测和植被恢复的效果评价较少从景观角度进行,然而对开采区进行景观尺度的研究,有助于了解植被的空间分布规律。本文以晋东(阳泉南庄煤矿)采煤作业区为干扰源,按照扇形取样,依距离设置800、1500、2100、2800、3500和4200m 6条等距线。采用LFA方法,沿垂直于等高线的方向,布设5条长度为100m的样线,通过对斑块数量、单位长度上斑块宽度、单位长度上斑块间平均距离和大小的测量,计算斑块面积指数和景观结构指数;对样线周围土壤进行地表土壤健康评价,评价指标包括地表盖度(降雨溅蚀保护)、多年生植被覆盖度、枯落物状况、隐花植被盖度4项植被层指标以及结皮破碎性、土壤侵蚀程度、沉积物、地表粗糙度、地表特征、土壤崩解系数、土壤质地7项土壤理化性质指标。通过研究揭示煤炭开采对当地景观结构与功能的影响距离及机理。结果表明:随着距煤炭开采区距离的增加,煤炭开采对土壤总孔隙度、土壤饱和含水量的影响削弱,进而造成了土壤稳定性指数、土壤渗透性指数、养分循环指数的同步上升。随着距离的增加,LFA相关的各项指标均呈现由慢速增加至快速增加再到逐步维持的趋势。景观功能向着有利于水分、养分保蓄的方向发展。当煤炭开采强度为320万t/a时,自然保护区及城市规划建设应保证最小生态安全距离为4370m。      

LFA3对饲喂高脂日粮大鼠血脂及SOD含量的影响

用ＬＦＡ３处理饲喂高脂日粮的Ｗｉｓｔａｒ大鼠，检测血脂及超氧化物歧化酶活性。结果表明，ＬＦＡ３能使饲喂高脂日粮的大鼠血清胆固醇、甘油三酯及肝胆固醇、甘油三酯分别下降２２％，３１％，４１％和２２％，而血清ＳＯＤ和肝ＳＯＤ活性分别上升２２％和３７％。提示，ＬＦＡ３有降血脂作用，并通过提高机体的ＳＯＤ活性而具有抗衰老作用。     

Organic Carbon and Alkalinity Increase in Topsoil After Rangeland Restoration Through Atriplex nummularia Plantation

This research studied the impact of fodder shrub plantations (Atriplex nummularia Lindl.) on topsoil properties, with particular reference to organic carbon, nitrogen, and soluble salts, in the Marrakech region (central Morocco). The studied plantation interventions were carried out to rehabilitate degraded rangeland and to mitigate desertification. The field experiment was conducted by drawing seventeen 50‐m‐long transects designed according to the ecological patch–interpatch approach defined by the Landscape Function Analysis. The top soil (0–5 cm) was sampled in 134 microsites, covering the main patch and interpatch types in plantation and control plots. The following variables were determined: pH, carbonates, organic carbon, total nitrogen, electrical conductivity, and soluble ions (Na⁺, K⁺, Ca²⁺, Mg²⁺ Cl⁻, NO₃⁻, SO₄²⁻ and PO₄³⁻). Statistical analyses were carried out to analyse changes between sites and between patch types. Most of the studied properties were strongly affected by the spatial pattern defined by the plantation, particularly when the sites with higher biomass production were considered. Organic carbon increased by around 63% and 117% when the under canopy patches were compared, respectively, to the between‐plants interpatches and to the control plots, a strong positive effect considering the aridity of the study area. On the other hand, a stronger increase was detected under canopy for most soluble salts and sodium adsorption rate. On average, the latter increased by 350% and up to 450% under the best developed plants, a stronger impact than observed in previous research, highlighting the very strong plant effect on the soil surface alkalinity. Copyright © 2015 John Wiley & Sons, Ltd.