农抗120中脂溶性主要组分A＇的结构鉴别

农抗１２０为刺孢吸水链霉菌北京变种的代谢产物，是一个多种组份的广谱抗真菌生物农药。组分Ａ＇是农抗１２０中脂溶性主要部分，经对其理化性质及光谱研究，鉴别为茴香霉素（Ａｎｉ－ｓｏｍｙｃｉｎ）。     

农抗120防治西瓜枯萎病的试验研究

1987～1989年进行了农抗120与常用化学杀菌剂防治西瓜枯萎病的药效对比,及不同使用期农抗120的防病效果试验,结果表明,全省多点用300倍农抗120,施药2次,防治西瓜枯萎病的效果平均为83.91±11.86％,比常用化学杀菌剂高23～43％,农抗120的防效与施药时期关系密切,两次灌根时间都应在发病之前,第一次施药时间:直播西瓜在4～5片真叶期,移栽西瓜在苗床期,右,据河南省120个县市,11万亩西瓜的防治示范结果,隔7～10天,进行第二次施药,病株率已控制在0～8％左平均防效为70～95％,每亩挽回西瓜损失200～400公斤。     

基于SHT75温湿度传感器的红薯育苗监测系统研究

采用C8051F120单片机设计并实现了一个温湿度监测系统。该系统采用SHT75温湿度传感器实现育苗室中温湿度的检测,满足温湿度测量精度的要求;同时在SHT75温湿度传感器数据传输过程中进行CRC数据校验,从而保证了测量数据的可靠性;并实现了相对湿度、温度与露点的实时数显功能。该系统控制温度范围广泛、可靠性强、使用灵活,达到了预期效果。     

不同自然与技术条件对水稻产量的影响研究

通过对超级杂交早稻新品种株两优819在不同自然与技术条件下种植的产量差异的分析比较．较系统地研究了自然与技术条件对水稻产量的影响。结果表明,自然生态条件对产量的影响大．是影响产量的主要因素;技术条件是影响水稻产量的重要因素。加强配套技术研究、集成与推广、普及对提高大面积水稻产量水平具有重要作用。     

低温诱导的位点特异性重组植物表达载体构建及小麦转化

选择标记基因的剔除是转基因植物商品化种植的重要基础.为建立小麦(Triticum aestivum)低温诱导的位点特异性标记基因删除体系,本研究以小麦西农928基因组DNA为模板,通过PCR扩增获得小麦低温诱导表达wcs120启动子,序列分析表明,该序列与GenBank中序列AF031235相比有一段21 bp插入,与AY493570.1序列完全一致.以含有CinH/RS2单向位点特异性重组系统的植物表达载体pXL5513为框架,成功构建了包含有抗旱相关性基因PYL5(pyrabactin-resistance like gene 5)表达框的低温诱导的位点特异性重组植物表达载体pXL5513-fwcs-RDA;并对小麦绵阳19(M19)幼胚愈伤组织进行基因枪转化,1 745块愈伤组织经筛选分化共获得9株转基因植株,经PYL5基因特异引物PCR检测,6株为阳性植株,低温春化处理后经删除引物PCR检测,6株阳性植株初步证实成功删除了选择标记基因.本研究为利用低温诱导的位点特异性重组系统进行小麦无标记基因转化奠定了基础.     

Prediction,Identification and Preliminary Study on Immune Efficacy of S1 Protein Epitope-polypeptides of Avian Infectious Bronchitis Virus

For the sake of verifying the immunogenicity of candidate epitope-polypeptide, the B and T cell epitopes of S1 protein of avian infectious bronchitis virus (IBV) H120 strain were predicted and the corresponding epitope-polypeptides were synthesized, and then were used to immunize mice, the immune effect was analyzed. Five epitope-polypeptides against S1 protein of IBV H120 strain were selected by epitope prediction software and acquired by chemical synthesis, then were immunized to mice. The specific antibodies, neutralizing antibodies and T lymphocyte subsets induced by each epitope-polypeptides were analyzed by indirect ELISA, neutralization test and flow cytometry. The ELISA results showed that the five epitope-polypeptides had good reactivity. The antibody titers of antisera induced by the five epitope-polypeptides sorted from high to low as follows: Pep76-106, Pep240-257, Pep511-537, Pep403-421, Pep135-172. The neutralization test results showed that the neutralization titers of antisera induced by the five epitope-polypeptides groups in mice were higher than that of the blank control group, and the order of neutralization titers was Pep240-257 = Pep403-421 = Pep511-537 > Pep76-106 = Pep135-172. The flow cytometry results showed that the percentages of CD3⁺, CD4⁺CD8^- and CD8⁺CD4^- T lymphocytes in all the five epitope-polypeptides groups were significantly higher (P<0.01) than those in the blank control group. The number of the CD3⁺ and CD4⁺CD8^- T lymphocytes sorted from large to small as follows: Pep403-421, Pep240-257, Pep76-106, Pep511-537 and Pep135-172. The number of the CD8⁺CD4^- T lymphocytes sorted from large to small as follows: Pep403-421, Pep76-106, Pep511-537, Pep240-257 and Pep135-172. In conclusion, Pep240-257, Pep76-106 and Pep403-421 could induce humoral immunity among the five epitope-polypeptides, while Pep403-421 could induce cellular immunity. Thus, peptide of Pep403-421 could induce cellular immunity and humoral immunity. This study laid a foundation for further understanding the immunological characteristics of the S1 protein and the development of diagnostic reagents and effective epitope vaccines.     

Use of the ADVIA 120 for differentiating extracellular and intracellular hemoglobin

BACKGROUND: The use of cell-free hemoglobin (Hgb) solutions, such as Oxyglobin (Biopure Corp, Cambridge, MA, USA), as a blood substitute for the treatment of acute anemias is increasing in veterinary medicine. These solutions interfere with colorimetric tests, which do not discriminate between cellular Hgb (Hgb-cell) from the patient and extracellular Hgb (Hgb-delta) from the Oxyglobin, and therefore make the monitoring of anemia, based on Hgb concentration, difficult. The ADVIA 120 hematology analyzer (Bayer Diagnostics, Tarrytown, NY, USA) evaluates Hgb by 2 methods, a standard cyanmethemoglobin colorimetric method and flow cytometry, and therefore might provide the means to differentiate extracellular and intracellular Hgb. OBJECTIVE: The objective of this study was to determine the accuracy and precision of the ADVIA 120 in differentiating extracellular from intracellular Hgb. METHODS: Anticoagulated whole blood samples from 10 healthy dogs were analyzed in triplicate on the ADVIA 120. Hgb-delta concentration was determined by adding Oxyglobin (13 g/dL) to the whole blood samples at dilutions of 1:1, 1:2, 1:4, 1:8, 1:16, and 1:32. Hgb-cell and Hgb-total values were calculated and compared with actual values by linear regression. Analyses were done in triplicate and repeated 9 consecutive times to evaluate intra-assay precision of Hgb-total and Hgb-cell determinations. RESULTS: Correlation between Hgb values obtained by colorimetric (Hb-total) and flow cytometric (Hgb-cell) methods on whole blood samples was high (R(2) = .99; n = 10) with a slope of 0.96 and intercept of 0. Correlation between actual and predicted Hgb-cell values also was high (R(2) = .99), with a small positive bias (0.289 +/- 0.185; n = 60). Intra-assay precisions were high, with most coefficients of variation <2%. CONCLUSION: The ADVIA 120 is capable of differentiating Hgb-cell from Hgb-delta. The flow cytometric method is accurate and precise when compared with the cyanmethemoglobin method. A small bias between the results is unlikely to be clinically significant but may affect the ability of the ADVIA to differentiate small quantities (<0.3 g/dL) of Hgb-delta.     

Evaluation of equine hemograms using the ADVIA 120 as compared with an impedance counter and manual differential count

BACKGROUND: The ADVIA 120 is an automated laser cell counter widely used in veterinary medicine. Although specific software for equine samples is available and validated, only a few reports have been published comparing the ADVIA 120 with other methods for equine hemogram evaluation. OBJECTIVES: The purpose of this study was to compare the hematologic values and reference intervals obtained on the ADVIA 120 with those obtained on an impedance cell counter and manual differential counts in healthy horses. METHODS: EDTA-anticoagulated blood samples were obtained from 114 clinically healthy horses of various breeds, both sexes, and 2-6 years of age. Samples were stored for up to 12 hours at 4 degrees C and then analyzed on the ADVIA 120 and the Hemat 8. A 100-cell to 200-cell differential leukocyte count was performed by 3 independent observers on May-Grünwald-Giemsa-stained smears. Intra-assay precision of the ADVIA 120 was determined by analyzing 5 replicates each of 10 of the blood samples. RESULTS: Results from the ADVIA were significantly higher than those from the impedance counter for RBC count, total WBC count, hemoglobin concentration, red cell distribution width, MCH, and MCHC, and significantly lower for HCT and platelet count. Significantly higher neutrophil and basophil counts and significantly lower lymphocyte counts were obtained with the ADVIA 120 compared with manual counts. Based on Passing-Bablok regression analysis, RBC and platelet counts were in good agreement between the 2 analyzers; a constant and proportional bias was present for other values. Coefficients of variation for erythrocyte parameters on the ADVIA were <1%, but were higher for platelet (6%), total WBC (2%), differential WBC (4%-30%), and reticulocyte (75%) counts. CONCLUSIONS: Results obtained with equine samples on the ADVIA 120 were comparable with those obtained on an impedance counter; reference intervals differed statistically but overlapped. The ADVIA had poor precision for reticulocyte and differential leukocyte counts such that the latter should always be verified on smears.     

Mean platelet component as an indicator of platelet activation in foals and adult horses

BACKGROUND: Mean platelet component (MPC) is a new platelet variable, measured by modern commercial complete blood count analyzers, that is reduced during platelet activation in humans and small animals. HYPOTHESIS: MPC decreases in horses with clinical conditions that cause platelet activation and disseminated intravascular coagulation (DIC). ANIMALS: We obtained 418 CBCs from 100 sick and 20 healthy neonates and 178 sick and 45 sound adult horses. Sick neonates were classified into septic and nonseptic, and DIC and non-DIC groups. Adults were grouped by diagnoses (systemic inflammatory disorders, gastrointestinal problems, and thrombocytopenia). METHODS: MPC together with platelet count, mean platelet volume, platelet distribution width, and platelet component distribution width were measured with a commercial analyzer and compared between the different disease and control groups in neonates and in adults. RESULTS: MPC values were significantly lower in the septic and nonseptic neonates (24.0 +/- 3.5 g/dL and 26.6 +/- 2.6 g/dL, respectively) than in the control group (28.1 +/- 1.7 g/dL). Neonates with DIC had the lowest MPC values (23.8 +/- 6.3 g/dL). MPC values in adult horses were significantly lower in the inflammatory (23.5 +/- 4.7 g/dL), gastrointestinal obstruction (23.0 +/- 5.0 g/dL), enteritis (23.6 +/- 4.6 g/dL), ischemic (23.9 +/- 5.1 g/dL), and thrombocytopenia (20.2 +/- 5.7 g/dL) groups when compared with control horses (26.2 +/- 3.5 g/dL). Other platelet variables were not different between the control and the disease groups. CONCLUSION AND CLINICAL IMPORTANCE: MPC might be a useful variable for quickly and easily detecting platelet activation in sick neonates and adult horses.