异物特征和断尾处理对断奶仔猪啃咬行为及其生产性能的影响

本文通过在猪栏内添加不同物理特征异物和断尾处理 ,对断奶仔猪的啃咬行为及其生产性能的影响进行了研究。试验中选择 35～ 40日龄大白猪及长白猪断奶仔猪各 6窝 ,从每窝选出健康均匀仔猪 6头 ,转群后放入一栏 ,公母各占一半。其中两个品种各有 2窝在出生后进行了断尾。试验分三个处理组 :T1 ,断尾组 ;T2 ,异物组一 ,在猪栏内放置篮球 ;T3,异物组二 ,在猪栏栅栏近地面处拴系三角皮带。每个试验组包括两个品种各两窝仔猪。试验使用摄像机 ,采取即时性观察方法进行观察。记录每日的采食量和仔猪试验前后的体重以计算日增重和饲料效率。试验结果表明 ,在猪栏内放置异物增加仔猪对添加异物进行探求和啃咬的时间。异物在栏内的位置不同对断奶仔猪咬尾行为、咬耳行为、咬蹄行为和啃栏行为等行为的影响不同。断尾也可以避免咬尾行为的发生 ,且有利于日增重和饲料效率的提高。

呼吸道异物的X线表现及异物特征分析

回顾性分析我院收治的59例呼吸道异物患儿的临床表现、异物种类、位置及X线表现。患儿临床表现为不同程度阵发性呛咳、气急、喘鸣以及呼吸困难;异物种类为植物性异物52例(88.14%),饭菜类异物4例(6.78%),特殊类异物3例(5.08%);2例(3.39%)异物位于喉与气管,51例(86.44%)异物位于单侧支气管,6例(10.17%)异物位于复合部位;X线表现为肺气肿51例(86.44%),其中16例(27.12%)伴有肺炎,单纯肺炎2例(3.39%),肺不张6例(10.17%)。单侧支气管与符合部位异物患儿X线均可见纵膈摆动。X线检查诊断呼吸道异物准确率高,图像清晰。

The New Discoveries of Specific Characteristics of Yulania Spach

The research history and new discoveries of the specific characteristics of Yulania Spach were reported, as to the specific characteristics, such as the terminal , axillary and fascicled similar flower buds,sometimes polycymes; 2-4 flower types of a plant; two spathe-like stipoles of single flower; drape or overlap of tepals, deep split or shallow split on the edge of tepals. The discoveries could provide valuable information for the further studies on the taxonomic system, anthotaxical evolution, phylogenetic relationship and breeding.

MINERALOGICAL FEATURES OF ULTRAMAFIC HYPOXENOLITHS IN ALKALI-RICH PORPHYRY

Ultramafic hypoxenoliths found in the alkali-rich porphyry in the Liuhe Village, Heqing, Yunnan, China, are of great significance in understanding the origin and evolution of the porphyry. This paper discusses the mineralogical features of the hypoxenoliths. It shows that the xenoliths are characterized by the upper mantle rocks modified to certain extent by the enriched mantle fluid metasomatism in the mantle environment, with the enriched mantle property of low-degree partial melting. This constitutes the important mineralogical evidence for the petrogenesis and mineralization of alkali-rich porphyry.

Expression of DLK1 Gene in the Bone Marrow Cells of Patients with Myelodysplastic Syndromes and Its Clinical Significance

Objective This study aims to investigate the expression of delta-like 1 （DLK1） gene in the bone marrow cells of patients with myelodysplastic syndromes （MDS） and to explore its molecular characteristics for the early diagnosis of MDS. Methods The expression of DLK1 mRNA in the bone marrow cells of cases with MDS, acute myeloid leukemia （AML）, and normal control groups were measured by real-time polymerase chain reaction and were analyzed for clinical significance. Results Significantly higher expression of DLK1 mRNA was observed in the bone marrow cells of MDS patients （0.7342±0.3652） compared with the normal control group （0.4801±0.1759） （P〈0.05）. The expression of DLK1 mRNA had a positive correlation with the proportion of bone marrow blasts （r=0.467, P〈0.05）. Moreover, DLK1 mRNA expression was significantly increased as MDS progressed （P〈0.05）. Patients with abnormal karyotypes exhibited significantly higher expression of DLK1 mRNA （0.9007±0.4334） than those with normal karyotypes （0.6411±0.2630） （P〈0.05）. Subsequently, patients with highly expressed DLK1 （≥0.8） presented significantly higher malignant clone burden （0.4134±0.3999） than those with lower DLK1 expression （〈0.8）,（0.1517±0.3109）, （P〈0.05）. Conclusions The DLK1 gene was highly expressed in MDS patients, and was increased as MDS progressed. The expression of DLK1 mRNA was positively correlated with the proportion of the bone marrow blasts. A high expression of DLK1 gene suggested a higher malignant clone burden of MDS.

Variability in the composition and export of silica in the Huanghe River Basin

Concentrations of suspended particle material(SPM), dissolved silicate(DSi), biogenic silica(BSi), phytoliths(plant produced siliceous microscopic structures), and other parameters were analyzed to examine the influence of both natural processes and human activities on silica delivery to the estuary of the Huanghe River(Yellow River). Our results indicate that the concentrations of DSi in the river decreased significantly since 1986. Approximately 34% of dissolved silica was trapped in the basin between 1986 and 2010 due to a reduction of soil erosion. Phytoliths comprised 67.2%–96.3% of BSi, with the smoothing bar type being the dominant form. Concentrations of BSi are significantly higher in the Huanghe River compared to other major rivers throughout the world due to its high sediment yield. We also found that the ratios of BSi/(BSi+DSi) and BSi/SPM were approximately 0.5 and 0.003 at Lijin near the river mouth, indicating that BSi carried in suspension by the Huanghe River was an important component of the rivers silica load. Significant amounts of BSi were also composed of phytoliths in Bohai Sea sediments near the Huanghe River estuary with the smoothing bar form again being the most abundant. The relatively high specific fluxes of BSi in the Huanghe River reflect its high turbidity and high erosion rates in the basin. The high sediment load originating on the Loess Plateau is likely responsible for the higher BSi flux, in agreement with a general trend of increasing BSi flux with increasing sediment flux in global river systems. This study demonstrates that BSi transported by rivers can be composed largely of phytoliths originating from the erosion of topsoils. The flux of phytoliths in river's suspended sediment load may therefore represent a significant contribution to the biogeochemical cycle of silica in coastal waters.

Spatial heterogeneity and population risk analysis of cotton bollworm, Helicoverpa armigera, in ChinaKey words spatial characteristics, spatial pattern, semivariance, population management, geostatistics, Helicoverpa armigera, population regulation

In this study, semivariance was used to quantitatively measure the spatial heterogeneity for the egg population of cotton bollworm during a growing season. The typical characteristic parameters of theoretical semivariance models against lag distances were applied to measure components of spatial heterogeneity： trend, range, spatial dependence, and the strength of spatial dependence. Then, kriging interpolation was used to evaluate the population risk of cotton bollworm exceeding economic thresholds. From early June through early September, the population densities were sampled 10 times in the study field. Results showed that the spatial patterns were related to population density. For its low-density population, the spatially heterogeneous trends were usually of spherical shapes; but for highdensity ones, the trends shifted to Gaussian shapes. The spatial dependence appeared at varied distances ranging from 52 meters to 936 meters, and the spatial dependence was in the range of 0.39-288.60, which changed with population densities. While having high heterogeneity, the strength of spatial dependence became much stronger. Results of population risk analysis showed that there was a high risk during its early stages, especially in mid-June. In August, population risk was so low that it did not need to be controlled.