黑杨派南方型无性系引种及选择的研究

对黑杨派南方型８个无性系的引种试验进行了总结。主要考察了高，径，材积冠幅和抗病能力，应用方差分析和系统聚类分析，将参试无性系划为３个等级，确定了适宜江西省江，湖冲积滩地推广的优良无性系，处于第１级的Ｓ１－８和７２５，其材积生长量分别比１－７２杨提高３２．６％和３０．２％，且有较好的抗病性能，处于第２级的５０、７１０、５５／５６和Ｓ１－６，它们的材积生长量比Ｉ－７２杨提高１７．６％￣２１．７％。     

饮高碘水对肉仔鸡生产性能及组织器官碘含量的影响

试验用艾维茵肉仔鸡１２０只，随机分为４组，分别饮用每千克含碘量为１５ｍｇ，２５ｍｇ，４５ｍｇ和０ｍｇ的饮水，饮用３７ｄ。结果表明：不同的碘水平对肉鸡生产性能、器官发育均未产生不良影响。但高碘饮水组鸡的组织碘含量均显著高于对照组鸡。     

浅析坡向、坡度、坡位对卫片色调的影响

文章以大兴安岭地区图强林业局 1999年森林资源二类调查成果为依据 ,探讨了坡向、坡度、坡位对卫片色调的影响 ,有助于建立目视解译标志 ,进行目视判读。从而减少林业调查外业工作量 ,降低成本 ,提高林业调查速度 ,缩短林业调查周期     

四川盆地丘陵区坡地农林复合系统林带类型、农作物复种方式的选择

针对四川盆地丘陵区农、林业生产特点和坡地农林复合系统特征，运用层次分析法（ＡＨＰ），从结构、功能，效益方面设置评价指标，分别对系统中的６种林带类型和１０种农作物复种方式进行综合评价，结果提出了３种较好的林带类型（即桤、柏混交和栎，柏混交－灌－草结构的林分以及桤木－草结构的林分）和４种较好的农作物复种方式（即小麦－花生、小麦／西瓜／蔬菜，蚕豆／玉米／红薯和蚕豆／西瓜／红薯等）；为该区坡地农林复合系统     

8203号杨木材基本性质的测定

本文对８２０３号和木材基本性质进行了测定，其结果：基本密度０．３４５ｇ／ｃｍ＾２；气干密度０．４０ｇ／ｃｍ＾２；干缩系数０．３６；纤维长度１３３７μｍ，长宽比５１；综纤维素含量８０％。８２０３号杨适宜制作各种板材及建筑用材，同时也是较理想的制浆、造纸材种。     

家蚕血液酯酶缺失型的遗传学研究

家蚕血液酯酶电泳图谱中A区酯酶缺失型东34,是共显性等位血液酯酶A区酶带不表达基因BesAo的纯合子,基因符号Bes Ao/Ao。东34是其亲本交配后代的分离,选择,固定后的产物。东34缺失的A区酶带属胆碱酯酶类。     

The effects of physostigmine on the electroretinogram in the beagle dog

The purpose of the study was to correlate electroretinogram (ERG) parameters with increasing levels of plasma, erythrocyte and ocular tissue cholinesterase inhibition using the beagle dog as a model for human neurovisual toxicity. The anticholinesterase compound physostigmine was administered at various steady-state intravenous infusion rates based on pharmacokinetic estimates of plasma and red blood cell cholinesterase inhibition. The most sensitive parameter was the b-wave amplitude of the rod response, which was significantly depressed compared to pretreatment at all levels of acute cholinesterase depression. The overall maximal ERG response demonstrated a trend of declining a-and b-wave amplitudes, which corresponded with the increased levels of cholinesterase depression, but these differences were not significant. The depression of the electroretinogram rod and cone amplitudes appeared to parallel plasma cholinesterase inhibition more closely than erythrocyte cholinesterase activity. Ocular tissue cholinesterase activity was significantly depressed in the retina (70%), cornea (60%) and dorsal rectus extraocular muscle (46%). Electroretinography may be a useful physiological tool for evaluating the ocular toxicity of certain chemicals or pharmaceuticals associated with cholinesterase biomarker activity.Abbreviations AChE acetylcholinesterase - Amp amplitude - BuChE butyrylcholinesterase - C _p plasma level - C _ss steady-state plasma concentration - D _L loading dose - e ^–kt the rate of elimination over time (t) - ERG electroretinogram - k elimination rate constant - Lat latency - MBW metabolic body weight - O₁–O₅ consecutive oscillatory potential wavelets - PreTx pretreatment - R rate of infusion - R _Inf rate of infusion - V _d volume of distribution     

科尔沁草地植被特征

科尔沁草地有维管束植物１６４２种，隶属１２４科，５４属，其中菊科，禾本科，豆科，蔷薇科合计１５６属，５９１种，分别占全地区总属数，总种数的２８．８４％和３５．９９％，全部植物属于１５个区系成分，以达乌尔－蒙古成分起主导作用。多年生草本植物（１００９种）是构成科尔沁草地植被的主体，中生植物（１１４１种）居优势地位，沙生植物和盐生植物的广泛分布也是本地区植被的重要特征，草原植被水平分布规律基本上呈西北     

北美红杉不同个体间插穗生根能力的研究

对北美红杉不同个体间插穗生根能力的试验研究表明:北美红杉不同个体间插穗生根能力存在着很大的变异性,其中生根率的变异范围在16%~100%,插穗的平均生根时间变异范围在39~110d;生根率与平均生根时间的负相关关系达到了极显著水平(相关系数r=-0.846 6);对31个单株个体插穗的生根类型研究表明,有27个为以愈伤组织生根为主的类型,有4个为中间生根类型;插穗生根率随着生根类型多样性的增加呈现升高的趋势。     

Characterization of the goldfish fecal microflora by the fluorescent in situ hybridization method

ABSTRACT:   Bacterial populations in goldfish feces were characterized by the fluorescent in situ hybridization (FISH) method. A total of nine different group-specific rRNA-targeted oligonucleotide probes were used. Approximately half of the microbial cells (57.8 ± 16.7%) were detected with a probe EUB338 and found to be bacteria. The microbial cells in 33–35 of the 35 samples from five specimens strongly hybridized with probes ALF1b, BET42a and GAM42a, suggesting that goldfish intestinal bacteria are mainly composed of α, β and γ-subclasses of Proteobacteria. The fact that a probe AER66 reacted with 25.6 ± 14.2% of the total microbial cells in all 35 samples, demonstrated that genus Aeromonas was the dominant species in the goldfish intestines. Genus Bacteroides including Bacteroides type A detected with a probe BAC303 was observed in 15 of 35 samples while other taxonomic groups determined with HGC69a, CF39a and P72 were detected in 6–11 of 35 samples. These results strongly suggest that Bacteroides shows the greatest daily fluctuation and interindividual variation in the intestines of goldfish. Moreover, the FISH method was proven to be useful for rapid enumeration of taxonomic groups of fish intestinal bacteria.