版纳甜龙竹笋早发多发技术措施试验

对云南省勐海县竹类科技园的版纳甜龙竹笋用林进行4因素3水平正交试验L9(34),即施肥、晒塘、覆盖、断顶4种处理,每种处理3个水平。结果表明,施肥可明显提高竹笋总产量,达到极显著差异;晒塘、覆盖和断顶都能明显提高提前发笋产量,达到显著或极显著差异;施肥、晒塘和覆盖都能提高经济效益,而断顶对提高经济效益没有达到显著差异。版纳甜龙竹笋早发多发技术措施最优组合为在春节后对竹篼晒塘30天,原表土恢复后,再用砻糠覆盖20cm厚,在10中旬施底肥(农家肥),3月中旬施第一次追肥(尿素+复合肥),6月中旬施第二次追肥(尿素+复合肥),能明显提高其发笋总产量、提前发笋产量和经济效益。     

渭南市人和公园植物资源调查及景观分析

采用实地调查法、样方法、查阅文献法和交流讨论法调查分析渭南市人和公园植物资源及景观现状。结果表明:人和公园共有植物48科75属86种,较大的科为禾本科、十字花科、菊科、木犀科、杨柳科;植物的应用频度方面,落叶乔木应用较广泛,常绿乔木缺乏,灌木及草本植物种类单调;植物花色单一,且花期只要集中在春季。针对存在的问题,提出了丰富植物层次,增加不同季节的花种的丰富性,利用垂直绿化拓展公园绿化空间,完善基础设施,设置景观节点以形成完整的景观结构体系,结合风景文化点突出文化古城特色等建议。     

不同浓度ABT植物生长调节剂对麻竹产笋效果的影响

采用不同浓度ABT植物生长调节剂对麻竹丰产效果进行试验研究,结果表明:不同浓度ABT植物生长调节剂处理对麻竹笋产量、笋数量与对照间均存在显著差异,三种不同浓度的ABT植物生长调节剂处理的麻竹笋产量、数量均明显高于对照,以15ppm浓度处理的麻竹产量最高。     

空心胶合木-钢插板螺栓节点承载力试验研究

为研究空心胶合木-钢插板螺栓连接节点承载力及延性性能,探讨了不同胶合木宽度和螺栓直径对破坏模式的影响,分析了不同宽径比、承压宽度对节点承载力、延性等的影响。结果表明:增加宽径比及承压宽度,可有效提高节点延性。宽径比12.5~16.4的节点延性较佳;宽径比10.0~10.9是单、双塑性铰破坏模式的临界点,可作为工程设计参考值。     

不同光质对马铃薯腋芽薯结薯特性及光合性能的影响

将“延薯4号”单叶节茎段转入白光、红光、蓝光、红蓝光（4:1）下,测定了腋芽薯结薯特性、蔗糖和淀粉含量及光合性能等指标。结果表明,蓝光处理腋芽薯形成最早,单薯重和结薯率最高;在腋芽薯形成过程中,叶片蔗糖含量、干物质含量、叶绿素a（Chla）、叶绿素b（Chlb）、净光合速率（P_n）、相对电子传递速率（ETR）、光化学猝灭系数（q_P）、实际量子产量（Y_PSⅡ）显著高于其他光质处理;红光处理叶片的蒸腾速率（T_r）、胞间二氧化碳浓度（C_i）、气孔导度（G_s）显著高于其他光质处理,蓝光处理最低;相同扦插时间叶片的潜在最大光能利用率（F_v/F_m）在不同光质处理间无显著性差异。基于上述结果,蓝光为诱导马铃薯单叶节茎段腋芽薯的理想人工光源。     

Diffusion weighted magnetic resonance imaging is a feasible method for characterizing regional lymph nodes in canine patients with head and neck disease

In dogs diagnosed with solid tumors, regional lymph node involvement or evidence of distant metastasis can predict worse prognoses and significantly decreased survival. Lymph node size alone has been shown to be insufficient as a predictor for the accurate clinical staging of some canine neoplasia. However, certain regional lymph nodes (including those of the oral cavity) are difficult to access for routine tissue sampling. Diffusion weighted magnetic resonance imaging (MRI) has demonstrated the ability to differentiate metastatic from inflammatory/benign lymph nodes in clinical studies with human cancer patients through the calculation of quantitative values of diffusion termed apparent diffusion coefficients (ADC). The objective of this prospective, exploratory study was to evaluate diffusion‐weighted MRI and ADC as potential methods for detecting metastatic lymph nodes in dogs with naturally occurring disease. We hypothesized that diffusion‐weighted MRI would identify significantly different ADC values between benign and metastatic lymph nodes in a group of canine patients with head or neck disease. Our study population consisted of eight client‐owned canine patients, with a total of 20 lymph nodes evaluated (six metastatic, 14 benign). Our results demonstrated that two of four observers identified a significant difference between the mean ADC values of the benign and metastatic lymph nodes. When data from all four observers were pooled, the difference between the mean apparent diffusion coefficients values of the benign and metastatic lymph nodes did not reach significance (P‐value = 0.0566). Findings indicated that diffusion‐weighted MRI is a feasible method for further characterizing enlarged lymph nodes in dogs with head and neck disease, however measured ADC values did not differ for benign vs. metastatic lymph nodes in this small sample of dogs.     

Sentinel lymph node mapping by near‐infrared fluorescence imaging and contrast‐enhanced ultrasound in healthy dogs

Sentinel lymph node (SLN) mapping is a valuable and crucial diagnostic procedure in staging malignancies. We compared two non‐invasive techniques, near‐infrared (NIR) fluorescence imaging and contrast‐enhanced ultrasound (CEUS), to identify the SLNs in three superficial anatomical regions in an animal model. Six healthy laboratory dogs were included in a proof‐of‐concept trial. A NIR fluorescent dye (Indocyanine Green) and microbubbles (Sonovue) were consecutively injected subdermally in the Inguinal, axillary and popliteal region to map the SLNs. Transcutaneous NIR fluorescence imaging identified SLNs in 17 out of a total of 18 occasions. CEUS identified SLNs in all regions (18/18). Whereas NIR fluorescence imaging performed better in the visualization of the afferent lymphatic tract, CEUS demonstrated different filling patterns of the SLNs, a feature potentially critical for the concept of SLN mapping in cancer patients. Both NIR fluorescence imaging and CEUS are safe, non‐invasive, practical and accurate methods to perform real‐time transcutaneous SLN mapping with potential in a clinical setting.     

Cytology and the cell block method in diagnostic characterization of canine lymphadenopathy and in the immunophenotyping of nodal lymphoma

Minimally invasive techniques used to evaluate canine peripheral lymphadenopathy (PLN), including fine needle aspiration biopsy with cytological evaluation (FNAB‐C) and flow cytometry (FC), have benefits and limitations. The cell block (CB) method is an alternate processing technique in which fine needle aspirate biopsy samples are concentrated, fixed, and embedded in paraffin for routine histological processing/staining. Utilizing three observers, we determined the diagnostic value of the CB in evaluating canine PLN across six categories (non‐diagnostic, reactive, inflammatory/infectious, probable lymphoma and lymphoma, metastatic neoplasia) and correlated findings to immunophenotypic and clonal antigen receptor rearrangement results in canine nodal lymphoma. Eighty‐five paired FNAB‐C and CB samples were evaluated from canine patients presenting to the University of Minnesota Veterinary Oncology or Internal Medicine services. Diagnostic quality samples were obtained in 55/85 (65%) CB and 81/85 (95%) FNAB‐C samples, respectively, and nodal pathology impacted CB diagnostic yield. Overall percent agreement between diagnostic‐quality FNAB‐C and CB samples was 86%, but increased to 95% if the categories of lymphoma and probable lymphoma were combined. There was 100% agreement for both the diagnoses of metastatic neoplasia and reactive lymph nodes and 92% agreement for the diagnosis of lymphoma/probable lymphoma. Using immunohistochemistry (IHC), CB samples correctly immunophenotyped 22/23 (96%) cases of B‐cell lymphoma, but only 1/6 (17%) cases of T‐cell lymphoma. IHC was not completed on nine cases of lymphoproliferative disease because of insufficient cellularity. When the CB method (CBM) yielded diagnostic quality samples there was good to excellent agreement with FNAB‐C samples and CB samples were suitable for some IHC tests.     

Relation between age, body weight, and medial retropharyngeal lymph node size in apparently healthy dogs.

The aims of this study were to determine the size of the medial retropharyngeal lymph nodes in apparently healthy dogs using ultrasonography and to investigate relationships between body weight (1.8-59 kg), age (1.0-15 years), and medial retropharyngeal lymph node sizes (width, height, and length). The sample population consisted of 100 apparently healthy, volunteered, adult dogs. The data were normally distributed, thus mean, SD, and Pearson's correlation were used. Repeatability of ultrasound measures was assessed as the percentage of differences between duplicate measures that were within 2 SDs of the differences: all measures were at least 93% repeatable (differences typically were < or = 0.25 cm and always < 1 cm). No difference between sexes was observed. The medial retropharyngeal lymph node increased in size with increased body weight (r = 0.46 to 0.59) and decreased in size with increased age (r = -0.30 to -0.50). Although statistically significant, the actual variation is not likely clinically important due to the small range of sizes, measurement error, and various combinations of age and body weight. Therefore, regardless of body weight or age, the average width is 1.0 cm, height is 0.5 cm, and length is 2.5 cm and maximum width is 2 cm, height is 1 cm, and length is 5 cm. Based on the maximal difference between duplicate measures (with some exception), any change > or = 0.4 cm with width or height, or > or = 1.0 cm in length, in a follow up measurement probably represents a true biological change rather than measurement error.