玉米秸秆热值性状杂种优势及配合力分析

采用NCⅡ交配设计以13个玉米亲本自交系组配42个杂交组合，对其玉米秸秆热值性状的杂种优势及配合力进行分析。结果表明，热值、纤维素含量、和木质素含量3个指标性状表现出明显杂种优势，热值杂种优势与纤维素含量、木质素含量的杂种优势关系密切，但不受半纤维素含量杂种优势的影响。一般配合力方差和特殊配合力方差均达到1%的极显著水平，说明不同自交系间存在较大的遗传差异。X178、掖52106的热值、纤维素含量、木质素含量的一般配合力较大，而半纤维素含量一般配合力较低；沈137的热值、木质素含量的一般配合力较高，纤维素含量的一般配合力居中，半纤维素含量的一般配合力低；这3个亲本在培育高热值玉米杂交种上具有较大应用潜力。沈137×黄C、齐319×昌7-2在热值、木质素含量、纤维素含量等性状上具有较高的特殊配合力，产生较强的杂种优势。笔者认为，玉米秸秆热值可作为玉米育种的目标之一，改变只注重产量和品质育种的做法，选育和推广既高产、优质，又高热值的玉米杂交种，提高玉米综合经济效益。     

Growth Response and Fatty Acid Composition of Juvenile Procambarus clarkii Fed Different Sources of Dietary Lipid

An experiment was conducted to evaluate the effects of feeding various sources of dietary lipidon weight gain, feed conversion, survival and fatty acid composition of juvenile red swamp crawfish, Procam-barus clarkii. Six semi-purified diets containing vitamin-free casein, defatted soybean meal, 0.5% cholinechloride, 0.5 % glycine and 0.5 % cholesterol were supplemented with 6.0 % of either anchovy oil, linseed oil,soybean oil, rapeseed oil, safflower oil or pork lard. Each diet was fed to crawfish (3.07±0.21 g averageweight) in three replicate aquaria for 60 days. Survival rate, weight gain and feed conversion were best forcrawfish fed the diet containing anchovy oil. Crawfish fed the linseed oil diet had the second highest weightgain, followed by crawfish on soybean oil, repaseed oil, safflower oil and pork lard diets, respectively. Feedconversion values were a reflection of weight gain. Results showed that both n-6 and n-3 fatty acids are dietaryessential for juvenile Procambarus clarkii, although n-3 fatty acids promoted faster growth than n-6. Howev-er, highly unsaturated fatty acids (HUFA) (20 : 5n-3 and 22 : 6n-3) had better growth-promoting effect than18 : 3n-3, due probably to the limited ability of crawfish to bioconvert fatty acids to polyenoic forms of longerchain length. The fatty acid composition of the crawfish generally reflected that of the dietary lipids, especial-ly for the diets containing unsaturated fatty acids.     

Rescue therapy with doxorubicin-based chemotherapy for relapsing or refractory feline lymphoma: a retrospective study of 23 cases

This study examined the efficacy of doxorubicin-based chemotherapy used for rescue therapy in refractory feline lymphoma. Records of 23 cats with lymphoma treated with chemotherapy who received doxorubicin for the first time in a rescue setting were reviewed. Seventeen (74%) of the 23 cats had only one treatment of doxorubicin. Five (22%) of the 23 cats had a positive response to doxorubicin and were given additional doses. The response to therapy in 4/5 of these responders could be assessed objectively, of which, two cats (9%) achieved partial remission (PR) and two cats (9%) achieved complete remission (CR). The two cats that achieved CR had differing response durations (6 weeks and greater than 47 months). Three of these five (60%) responders had also received concurrent other chemotherapy in addition to doxorubicin. Cell type and the use of concurrent chemotherapy were significant predictors of response. Cats with small-medium cell lymphomas (P=0.001) and cats that received concurrent chemotherapy with doxorubicin rescue (P=0.007) were more likely to respond favorably. This study suggests that doxorubicin-based chemotherapy is not an effective rescue protocol for feline lymphoma.     

新疆喀什地区的杏及其栽培技术要点

新疆喀什地区目前有杏树13.3万hm2,占全区果园面积的80%以上.大佳娜丽、冰佳娜丽、乔丽番、阿克木克牙格勒克等11个品种栽培较多.本文着重介绍11个杏品种并指出其栽培技术要点.     

免耕覆盖对春小麦灌浆期干物质积累特性及最终产量的影响

以常规耕作处理作对照,研究了免耕覆盖下春小麦灌浆期间干物质积累分配特性和产量变化,结果表明,高、低秸秆覆盖量下春小麦灌浆期间干物质积累量比常规耕作分别高16.1%、9.8%,免耕秸秆覆盖为春小麦籽粒和产量形成提供了更充足的物质来源;与常规耕作比,免耕覆盖处理的春小麦在花后21-28 d时干物质积累量有个快速增加阶段;在干物质的运转分配中,免耕覆盖对春小麦灌浆期积累的干物质在各个器官间的分配比例影响较小。相对于常规耕作而言,免耕秸秆覆盖处理提高了春小麦产量,其产量的增加主要依赖于花前光合产物的积累,对花后光合产物调用较少。低覆盖量下春小麦较常规耕作增产11.68%,高量覆盖较常规增产18.52%。     

全球开放获取学术交流联盟平台政策、资源与服务研究

[目的/意义]随着开放获取运动的不断开展,书目多样性正被纳入全球开放科学战略框架内进行分析和讨论。全球开放获取学术交流联盟（GLOALL）各平台的政策、资源与服务等体现了对地域、语言以及学术评价等多样性的重视,同时有利于实现书目多样性所强调的多种文化和思想的碰撞与兼容。[方法/过程]本文主要以书目多样性研究为理论基础,与当今开放获取实践相结合,对GLOALL各成员平台的政策、资源和服务进行阐释、对比和分析。[结果/结论]GLOALL的建设经验对国内推进开放获取实践、构建高端学术交流平台具有一定的借鉴意义。对其平台模式的研究有利于国内更好地把握开放获取运动中的机遇,弥补当前服务机制存在的缺口,探索更适合国内的OA模式。