我国大豆生产波动动因分析——基于省际面板模型的实证研究

在我国大豆生产波动频繁的情况下,找出影响大豆单产、种植面积的影响因素是实现“提单产、稳面积”的首要举措。研究采用1999~2020年21个省份面板数据,在分析大豆单产、种植面积的变化趋势基础上,根据大豆单产增减趋势,把大豆产区划分成增产区、减产区和波动区,采用改进的面板数据模型分别对三个产区的大豆单产和种植面积的影响因素进行实证分析。结果表明,机械化收割、产研结合、农药投入、小型拖拉机的投入是影响不同区域大豆单产的显著因素;机械化耕作是提升所有区域种植面积的显著因素,玉米种植面积、化肥投入、农药投入、灌溉条件、科研资金与人员投入、产研结合、机械化收割是影响不同区域大豆种植面积显著因素。根据分析,提出了相应政策建议。

异基因移植患者进行Id4基因检测的意义初探

【目的】探讨在行异基因外周血干细胞移植的急性白血病(AL)患者中进行Id4基因甲基化检测对预测临床复发意义。【方法】用甲基化特异性PCR(MS-PCR)方法对16例接受异基因外周血干细胞移植的AL患者,检测其移植前、移植后6个月和12个月的骨髓Id4基因甲基化状态,并随诊分析。【结果】10例患者移植前Id4基因呈甲基化的患者中5例在移植后再次出现Id4基因甲基化,其中4例在随访期出现复发或复发倾向。而5例移植前Id4基因呈非甲基化的患者中,无一例在移植后再次甲基化,随访期间也无复发倾向。【结论】AL患者在移植后进行Id4基因甲基化检测对于预测白血病的复发可能有一定意义。

视神经钳夹伤后凋亡相关基因Bcl-2和Bax在大鼠视网膜上的表达

目的研究视神经钳夹伤后凋亡相关基因Bcl-2和Bax在大鼠视网膜上的表达,探讨Bcl-2和Bax在视神经钳夹伤后视网膜神经元凋亡中的作用。方法将雄性LongEvans大鼠50只,随机分成实验组和对照组,每组25只大鼠。建立大鼠视神经钳夹伤模型,实验组和对照组按视神经夹伤后不同时间分为伤后1 d、3 d、5 d7、d1、4 d 5个时间点,每个时间点5只动物。处死动物后取材,制备大鼠视网膜石蜡切片,进行免疫组化SABC染色,以检测视网膜Bcl-2和Bax的表达。结果视神经钳夹伤后视网膜Bcl-2的表达下降,而Bax表达仍为不变的水平。结论视神经钳夹伤后视网膜Bcl-2表达的下降,导致了视网膜神经元的凋亡。

豚鼠形觉剥夺性近视视网膜早基因c-fos的动态表达

目的建立豚鼠形觉剥夺性近视(form-deprivationmyopia,FDM)动物模型,并对豚鼠形觉剥夺性近视形成及恢复过程中视网膜早基因c-fos的动态变化进行观察,研究豚鼠FDM中视网膜信号转导及抑制近视的可能分子机制。方法3周三色豚鼠40只,随机均分为4组:遮盖前组、单眼遮盖1周组、单眼遮盖2周组及去遮盖组。对各组进行视网膜检影和A超测眼轴,分别运用免疫组化和RT-PCR观察各组视网膜c-fos蛋白及mRNA的表达和变化。结果遮盖2周后,遮盖眼较对照眼呈高度相对近视(-8.8 D),视网膜c-fos表达明显下调,双眼屈光度、眼轴和视网膜c-fos的表达差异均有显著性(P<0.05);遮盖2周后,去遮盖1周,去遮盖眼较对照眼呈中度相对近视(-5.9 D),但去遮盖前后屈光度及眼轴差异无显著性(P>0.05),去遮盖眼较对照眼视网膜c-fos的表达明显上调,差异有非常显著性(P<0.01)。结论形觉剥夺能成功诱导豚鼠近视的发生及发展,并抑制视网膜c-fos的表达,而去除形觉剥夺可抑制近视的发展,并诱导视网膜c-fos的表达上调,证明c-fos的表达规律不仅反映外界视觉环境对眼的刺激,并与近视发展规律呈负相关,可能参与视网膜的信号转导和近视的抑制机制。

腹腔胃肠道外间质瘤临床病理分析

为了研究腹腔胃肠外间质瘤(gastrointestinal stromal tumor,EGIST)的临床病理、免疫组化、鉴别诊断和预后,对7例腹腔EGIST用光镜观察,免疫组化SP法检测CD117和CD34等的表达并进行随访。结果肿瘤直径平均17.2 cm,组织形态、免疫表型等与GIST相似,以短梭形细胞型为主,细胞密集,有不同程度的异形性,结构类似于平滑肌肿瘤。CD117阳性表达率为100%(7/7),CD34为71.4%(5/7)。随访6例,有4例术后2年内死亡。初步研究结果提示,腹腔EGIST好发于中老年人,具有GIST类似的组织学特征及免疫表型,恶性潜能高,预后较差,手术切除是主要的治疗方式。

甲状腺癌45例P21和P53的表达及临床意义分析

目的:探讨P 21和P 53基因在甲状腺癌中的表达及临床意义。方法:运用免疫组化SP法检测45例甲状腺癌石蜡标本中P 21和P 53的表达。结果:P 21和P 53在甲状腺癌和良性甲状腺病变中的表达阳性率分别为86.7%及26.7%和57.8%及33.3%。两者比较,差异有显著性(P<0.05)。有26例同时存在P 21和P 53的过度表达,术后4 a中3例死亡,8例复发。结论:癌基因P 21的激活和抑癌基因P 53的失活在甲状腺癌发生中有协同作用,P 21和P 53在甲状腺癌的共同表达提示预后不良。

肿瘤细胞系血管内皮生长因子及其受体共表达的研究

背景与目的:血管内皮生长因子(vascularendothelialgrowthfactor,VEGF)旁分泌在肿瘤血管新生中的作用已得到证实,但其自分泌作用尚不清楚。本研究的目的是分析VEGF及其受体(Flt-1和KDR)基因在恶性肿瘤细胞系中的共表达。方法:以看家基因为内标,采用半定量逆转录-聚合酶链反应分析VEGF及其受体基因在30种肿瘤细胞系和4种内皮细胞中的表达水平。结果:在29种肿瘤细胞系和3种内皮细胞系检测到中度以上的VEGF基因表达,而人脐静脉内皮细胞仅有低表达;Flt-1基因表达分别见于50%(6/12)的血液肿瘤,28%(5/18)的实体瘤细胞和2种内皮细胞;仅在16.7%(2/12)的血液肿瘤,33.3%(6/18)实体瘤细胞和2种内皮细胞检测到KDR基因表达;而ECV304细胞并无Flt-1或KDR基因的表达。结论:VEGF基因高表达是肿瘤细胞的重要特征,而VEGF及其受体共表达表明肿瘤细胞系中存在自分泌途径。

Chromosome Location of the Male-sterility and Yellow Seedling Gene in Line 1066A of Foxtail Millet

Using foxtail millet (Setaria italica (L.) Beauv.) male-sterile line 1066A as female parent and Yugu 1 primary trisomic series (1 - 7) and tetrasomics 8, 9 as male parents, chromosome location of gene for male-sterility and yellow seedling in line 1066A was studied by primary trisomic analysis. The plants of F-1 generation of trisomics 2 - 9 were obtained by crossing with a great many plants of 1066A. F-1 generation of trisomics was similar to their male parent in morphologic characters, the color of their seedling was green, and pollen was partially fertile. The segregation ratio of fertility to sterility is 3:1 in F-2 generation of trisomics 2, 3, 4, 5, 7, 8 and 9; and 14:1 only in F-2 generation of trisomic 6 (chi(0.05)(2) = 0.012). The segregation ratio of green seedling to yellow seedling is 12:1 only in F-2 generation of trisomic 7 (chi(0.05)(2) = 0.31), but in other cases, this ratio is 3:1. The results indicated that the male-sterility gene was located on chromosome 6, and the gene for yellow seedling was monogenic recessive and located on chromosome 7. The rate of trisomics transmission by pollen was tested, trisomics 8 and 9 were the highest in rates of trisomics transmission and followed by trisomics 6 and 4.

HP相关性胃癌组织中COX-2和Bcl-2的表达及其意义

目的:探讨HP相关性胃癌组织中COX-2和Bcl-2的表达及其意义。方法:选取68例胃癌组织为实验对象,各对应的癌旁组织为对照组,并选取20例正常胃组织为正常对照组。检测各样本的COX-2和Bcl-2蛋白,并对所得数据进行统计分析。结果:COX-2及Bcl-2蛋白在胃癌组织、癌旁组织及正常组织中的阳性表达率分别为61.8%和70.6%,25.0%和27.9%,15.0%和30.0%。COX-2及Bcl-2蛋白在胃癌组织中的阳性表达率均明显高于癌旁组织及正常组织。胃癌组织中COX-2与Bcl-2表达显著正相关。HP感染的胃癌组织中COX-2及Bcl-2的表达明显高于无HP感染的胃癌组织。结论:胃癌组织中,HP的感染率较高,HP相关性胃癌中,COX-2与Bcl-2均高度表达且密切相关。HP感染可能通过COX-2的过度表达,诱导细胞增殖并刺激Bcl-2蛋白表达抑制细胞凋亡,从而使细胞增殖和凋亡失衡,促进胃癌的发生发展。

Complete Sequence and Gene Organization of the Mitochondrial Genome of Tokay (Gekko gecko)

Long-PCR amplification, clone and primer-walking sequencing methods were employed in determine the complete sequence of mitochondrial genome of tokay (Gekko gecko). The genome is 16 435 bp in size, contains 13 protein-coding, 2 ribosomal and 22 transfer RNA genes. The mt genome of Gekko is similar to most of the vertebrates in gene components, order, orientation, tRNA structures, low percentage of guanine and high percentage of thymine, and skews of base GC and AT. Base A was preferred at third codon positions for protein genes is similar to amphibians and fishes rather than amnion vertebrates. The standard stop codes (TAA) present only in three protein genes, less than those of most vertebrates. Transfer RNA genes range in length from 63 to 76 nt, their planar structure present characteristic clover leaf, except for tRNA-Cys and tRNA-Ser (AGY) because of lacking the D arm.

肝癌长期生存患者临床病理特点及P53、c-myc表达研究

目的:探讨肝癌术后长期生存患者临床病理及P53、c-myc癌基因表达的特点和意义。方法:以启东肝癌高发区34例肝癌术后生存10年以上的病例(A组)作为研究对象,42例肝癌术后5年内死亡的病例(B组)为对照,进行临床病理特点观察,并用免疫组化方法检测肝癌及癌旁P53和c-myc表达。结果:肝癌组织中P53、c-myc表达阳性率分别为56.58%(43/76)和60.53%(46/76),A组中分别为47.06%(16/34)和50.00%(17/34),B组中分别为64.29%(27/42)和69.05%(29/42),两组相比无显著差异。癌旁组织中P53、c-myc表达阳性率分别为42.11%(32/76)和57.89%(44/76),A组中分别为26.47%(9/34)和41.18%(14/34),与B组中54.76%(23/42)、71.43%(30/42)相比差异有统计学意义。A组85.29%(29/34)的病人有完整包膜,显著多于B组的21.43%(9/42);5.88%(2/34)有门脉栓塞,38.24%(13/34)伴有肝硬化,显著低于B组(69.05%,78.57%)。结论:癌周组织中P53、c-myc表达与术后生存呈负相关;肝癌包膜完整、无门脉栓塞、无肝硬化的单结节病人,预后好,术后生存期明显延长。

The Inheritance of Early Heading in the Rice Variety USSR5

USSR5, a japonica rice variety from the former Soviet Union, is an extremely early maturing rice variety. To elucidate the genetic basis for its early heading, genetic analysis was carried out by crossing it with a set of major gene nearly isogenic lines （NIL） and QTL-isogenic lines. The early heading of USSR5 was attributed to the presence of photoperiod-insensitive alleles at E1 and Se-1 gene, the photoperiod-sensitive inhibitor gene i-Se-1, and the dominant earliness gene Ef-1. Analysis of a backcrossed population （BCIF1） derived from the cross USSR5 x N22 indicated that two quantitative trait loci （QTL） for early heading were located on chromosomes 7 and 8, accounting for 27.4% and 11.2% of the phenotypic variance, respectively, with both early alleles originating from USSRS. From an F2 population of the same cross, early heading QTLs were detected on chromosomes 1, 2, 7, 9, and 10, with individual QTL accounting for between 4.1% and 15.4% of the phenotypic variance. Early heading alleles at four of these five QTLs originated from USSRS. A comparison of chromosomal locations suggests that one of these QTLs may be identical with the known gene Hd4 （E1）. The relationship between the other QTLs and known genes for heading date are not clear. USSR5 is a promising source for propagating earliness for the development of improved early heading rice varieties.

Molecular Tagging and Effect Analysis of a New Small Grain Dwarf Gene in Rice

Plant height is one of the important agronomic traits of rice. Over higher plant would easily result in plant lodging and output reducing. On the other hand, the dwarf varieties with proper plant height had higher lodging resistance and a greater harvest index, allowing for the increased use of nitrogen fertilizer. Dwarf breeding had made a great breakthrough in the rice breeding. The breeding and extension of excellent dwarf varieties remarkably improved the yield potential of rice. Therefore, the plant height is still one of the focuses in rice genetic research.

Cloning and Sequence Analysis of Actin Gene from Rehmannia glutinosa

[ Objective ] The aim of this study is to clone and analyze the actin gene from Rehmannia glutinosa. [ Method ] Degenerate primers were designed according to the conserved regions of actin sequences of Rehmannia glutinosa and its similar species, RT-PCR was next conducted to amplify the actin gene from Rehmannia glutinosa. [ Result] The amplified fragment is 724 bp and correspondingly 240 amino acids. The BLAST results indicate that the homology between the amplified fragment and other higher plants for aetin gene sequences and amino acid are more than 80% and 90%, respectively, suggesting that the amplified fragment is the actin gene of Rehmannia glutinosa. [ Conclusion] Phylogenetic analysis shows that the actin gene of Rehmannia glutinosa has an intimate genetic relationship with actin7 gene of Nicotiana tabacum.

Analysis on Heredity and Variation of the ORF_5 Gene of Prevalence Strains Porcine Reproductive and Respiratory Syndrome Virus

[ Objective] The aim was to analyze the reason and epidemic trend of PRRSV, and provide theoretical basis for preventing and controlling PRRS. [Methed]According to the sequence of ATCC VR-2332 strain porcine reproductive and respiratory syndrome virus published by the GenBank, the primers were designed and synthesized. ORF5 gene sequences of seven prevalence strains were amplified by RT-PCR. The sequences of ORF5 genes were analyzed by DNAStar and compared with those of ATCC VR-2332, CH-1 a, B J-4, LV-M96262 and MLV vaccine strains, phylogenetic tree among isolates was analyzed. [Result] Analysis of nucleotide sequence showed that the homology was 88.1% - 98.8%, 89.9% -95.2%, 85.6% -98.7% between ORF5 genes of seven prevalence strains and VR-2332, CH-1a, BJ-4, and the homology was 54.7% -56.9% between ORF5 genes and LV. Analysis of amino acid sequence showed that the homology was 88.1% -96.8%, 88.1% - 94.5%, 86.1% -96.5% between ORF5 genes of seven prevalence strains and VR-2332, CH-1a, bBJ-4, the homology was 54.7% -56.2% between the ORF5 genes and LV.[ Conclusion] The variation of prevalence strains was great in the ORF5 gene region, the homology of ORF5 gene sequence was higher and genetic relationship was nearer during prevalence strains in the same region, or was far in different regions.

Expression of Porcine Reproductive and Respiratory Syndrome Virus ORF7 Gene and Purification and Immunological Activity Analysis of the Recombinant Protein

[Objective] The aim of this study was to realize efficient expression of the porcine reproductive and respiratory syndrome virus （PRRSV） ORF7 gene in genetic engineering bacteria and analYze the immunological activity of the recombinant protein after purification. [ Method] The constructed recombinant expression vector pET-ORF7 was transformed into Escherichia co1BL21 （DE3） and induced by IPTG under the optimal condition. After analysis of SDS-PAGE and Western Blot, the expression products were purified by Ni-NTA His · Bind Resin chrom- atographic column under denaturing condition and renatured by gradient dialysis. Subsequently, the immunological activity of the renatured recombinant protein was detected by Westem Blot and indirect ELISA. [ Result] The recombinant plasmid pET-ORF7 expressed in E. coli successfully, and the fusion protein was in the form of inclusion body. By SDS-PAGE detection, the molecular weight of the expression protein was approximate 33 kD, according with the expectation. Analysis by Bandscan software showed that the expressed fusion protein was about 50% of total bacterial protein of BL21 （DE3）. Wastem Blot and indirect ELISA detection showed that the renatured protein could react with PRRSV positive serum specifically, indicating its good immunological activity. [ Conclusion] This study lays a foundation for the preparation of PRRSV monoclonal antibody and diagnostic kit.

胃肠道间质瘤43例临床病理及免疫组化特点

目的:探讨胃肠道间质瘤(gastroin-testinalstromaltumors,GISTs)的组织学起源、病理特点及合理的外科治疗。方法:回顾分析43例经手术治疗的GISTs患者的临床病理资料;免疫组织化学方法检测CD117、CD34、HHF35和S-100的表达情况。结果:免疫组织化学阳性表达率CD117为95·3%(41/43),CD34为74·4%(32/43)。良性、潜在恶性和恶性组之间在肿瘤直径大小(P=0·000)、核分裂相数(P=0·000)、复发/转移率(P=0·016)及CD117阳性率(P=0·021)上的差异有统计学意义。结论:CD117及CD34对GISTs的诊断和治疗具有重要意义。支持将肿瘤直径大小、核分裂相数、复发/转移率及CD117阳性率作为间质瘤恶性潜能的参考指标。核分裂相数多及CD117阳性提示恶性度较高。大多数胃肠道外间质瘤为高恶性潜能。

Cloning and Sequence Analysis of 16S rRNA and COI Gene in Mitochondrial DNA of Scortum barcoo

[Objective] The aim was to provide molecular biological basis for the researches on the genetic resources,genetic relationship among species and phyletic evolution of S.barcoo.[Method] PCR amplification and sequencing were used to study the 16S rRNA and COI gene fragments.[Result] As for 16S rRNA gene fragments,nucleotide sequences of 791 bp were obtained,and the A,T,G and C contents in this fragment were 31.6%,21.4%,20.4% and 26.7%respectively.As for the COI gene fragments,the size was 631 bp and the A,T,G And C contents were 27.7%,23.6%,29.8% and 18.9% respectively.Among these two gene fragments,the content of GC was lower than AT,and AT/GC of these two fragments was 1.13 and 1.05 respectively.[Conclusion] The genetic characteristics of gene fragments of 16S rRNA and COI of S.barcoo suggested that the variation in the same species was relatively low.The sequences of 16S rRNA gene in three samples the same,while the sequences of COI gene was also the same,indicating that these two gene of S.barcoo were conservative.