子午岭林区油松密度管理图的编制

利用先进的计算工具，编制了“子午岭油松人工林密度管理图”，经检验达到了精度要求。该较为子午岭林区人工油松林的抚育间伐，生长量预测，造林设计等经营活动提供了科学依据。     

三江平原蒙古栎次生林效应带生态功能模拟

以三江平原试验区为背景,采用植物生态场技术开展次生林效应带生态功能模拟,研究结果表明:蒙古栎林6m效应带产生斑块效应,8m效应带出现边缘效应;4m,6m和8m带的光能利用与风流动模式与效应带的分布方位关系密切,根据光能利用效率总结出蒙古栎林效应带依照8 m带→6m带→4m带逐步演化。     

Roles of atypical chemokine receptors in progression and metastasis of tumor

Chemokines and their receptors have been implicated mostly in tumor progression and metastasis. Atypical chemokine receptors (ACKRs) comprise a group of 7-transmembrane domain proteins structurally similar to G protein-coupled receptors. However, ACKRs do not induce classical signaling via the typical G protein-mediated pathways. ACKRs efficiently internalize the cognate chemokine ligands and act as scavengers instead. ACJRs are composed of at least 3 members of chemokine receptors:Duffy antigen receptor for chemokines (DARC, also known as ACKR1), D6 (also known as ACKR2) and ChemoCentryx chemokine receptor (CCX-CKR, also known as ACKR4). These receptors bind to and/or internalize their chemoattractant ligands without activating signal transduction cascades leading to cell migration. In this review, we summarize the recent progress regarding the roles of ACKRs in the progression and metastasis of tumor.     

浅谈砌体结构裂缝的控制措施

本文论述了砌体结构裂缝产生的性质和原因 ,并针对裂缝宽度的标准问题及如何防止墙体开裂构造措施提出几点建议。     

太白山锐齿栎树干基部两种蚂蚁的筑巢生态学及其蚁巢、体表真菌组成研究(英文)

本文研究了太白山锐齿栎景观林带树干基部筑巢的两种蚂蚁的筑巢生态学及其巢内真菌的组成。研究结果表明:亮腹黑褐蚁Formica gagatoides Ruzsky是锐齿栎林中的优势蚁种,可在地表及树干上活动,主要取食栎树枝条上蚜虫所分泌的蜜露及其他昆虫和植物材料;盘腹蚁Aphaenogaster sp.仅在蚁巢周围活动,捕食其他小型昆虫;亮腹黑褐蚁F.gagatoides蚁巢材料含水量非常高,而盘腹蚁Aphaenogaster sp.的蚁巢较为干燥。锐齿栎林中树干的平均蚁栖率为20.3%,但蚁栖率随海拔差异而不同(海拔1800m的锐齿栎林带蚁栖率仅为6%,海拔1600m的锐齿栎林带蚁栖率高达38.5%)。两种蚂蚁的长期营巢活动造成树干基部腐朽、孔洞不断扩大,严重影响锐齿栎树干的水分、营养传输及生长,且极易倒伏和风折。两种蚂蚁巢内及其体表真菌的种类组成明显不同,从亮腹黑褐蚁F.gagatoides蚁巢材料中可分离出7种真菌,而从盘腹蚁Aphaenogaster sp.巢中仅分离出2种;从亮腹黑褐蚁F.gagatoides体表可分离出4种真菌,而从盘腹蚁Aphaenogaster sp.体表分离到3种真菌;其中Tri...     

对改进和完善常规木材干燥室设施的探讨

分析了我国当前木材干燥生产中常规干燥室存在的问题,探讨了干燥室的改进措施,提出了合理建议和意见。     

催化α-蒎烯聚合

制备了中孔A1系和Zr系分子筛，用H2SO4和H3BO3处理中孔分子筛(MCM-41)分别得到强酸性SO4^2-／A1-MCM-41、SO4^2-／Zr-MCM-41、BO3^3-／A1-MCM-41及BO3^3-／Zr-MCM-41中孔分子筛催化剂。XRD、FT-IR及Hammet，指示剂测试结果表明：这些中孔分子筛具有一定的长程有序性，结晶较好；强酸基团已进入MCM-41骨架内部，并与骨架原子形成了化学健，从而产生强酸中心；H0值小于-12.76，具有超强酸性。以它们为载体，负载A1C13制成复合催化剂，催化α-蒎烯聚合，考察了载体种类、负载量及溶剂极性对α-蒎烯聚合的影响。     

南京中山陵风景区常绿阔叶树种引进及风景林林相改造技术的研究

根据中山陵风景名胜区森林景观建设的需求和遭受松材线虫病危害，严重影响着森林景观的现状，在遭受松材线虫病危害的松林及杂阔林内应用“林下补阔技术”，引进了若槠、香樟、石楠、大叶女贞、木荷、海桐、乐昌含笑和深山含笑等常绿阔叶树种，进行常绿阔叶树与松树、常绿阔叶树与落叶阔叶树异龄复层混交，以形成较稳定的含常绿树种成分的复层混交森林群落，增加树种的多样性，丰富森林绿景，改善林相结构，进一步提高森林生态系统的稳定性和景观质量。并为风景林林相改造研究出了常绿阔叶树种深山含笑、乐晶含笑异地扩大繁殖播种育苗技术，为林相改造提供了造林新树种。     

兜兰属植物研究现状

介绍兜兰属植物的研究现状,重点介绍其野生资源、栽培繁殖等.并对目前存在的问题,特别是杂交、繁育和可持续利用方面进行分析,指出兜兰属植物开发利用的方向.     

First report of seroprevalence of swine influenza a virus in Tibetan pigs in Tibet, China

Swine influenza A virus (SIV) is zoonotic pathogen that can be acquired by food-borne transmission because food animals, for example pigs, are recognized as a reservoir. The objectives of this study were to determine the seroprevalence of anti-SIV (H1N1 and H3N2) in Tibetan pigs in Tibet Nationality Autonomous Region, China, a region with cold weather and high altitude. A total of 421 serum samples were randomly collected from Tibetan pigs in Tibet and were evaluated for antibodies against SIV using enzyme-linked immunosorbent assay. Overall, 52 % (219/421) of the animals was positive for H1N1, 16.9 % (71/421) positive for H3N2, and 8.8 % (37/421) positive for both H1N1 and H3N2. The results of the present survey indicated that SIV is highly prevalent among Tibetan pigs in Tibet, China. The results of the present investigation have implications for the ongoing control of SIV infection in Tibetan pigs in Tibet, China and elsewhere.