Genetic diversity of the brown marmorated stink bug <Emphasis Type="Italic">Halyomorpha halys</Emphasis> in the invaded territories of Europe and its patterns of diffusion in Italy

Halyomorpha halys is an invasive stink bug pest originating from East Asia. In Europe, it was first detected in Switzerland in 2004. It is now present in thirteen countries, and seems to be spreading throughout the continent. In Italy, where it has been recorded since 2012, other than being an urban nuisance, it is causing severe damage in commercial fruit orchards. An integrated approach, using current and previous observational data in space and time and molecular information, was used to identify the genetic diversity of this pest in Europe, its invasion history, and the potential pathways of entry and diffusion. The analysis of 1175 bp of mitochondrial DNA cytochrome c oxidase I and II genes (cox1, cox2) led to the identification of twenty previously unknown haplotypes. The European distribution of H. halys is the result of multiple invasions that are still in progress, and, in some cases, it was possible to identify the specific Asian areas of origin. Moreover, secondary invasions could have occurred among European countries by a bridgehead effect. In Italy, the data were more clearly related to their temporal occurrence, allowing for a clearer reading of the patterns of invasion and dispersion. After having successfully established in localized areas, H. halys further expanded its range by an active dispersion process and/or by jump dispersal events due to passive transport. The multiple introductions from different areas of the native range together with the different patterns of diffusion of H. halys, may hamper the pest management strategies for its containment.     

我国螨类研究的最新进展

螨类是一种对人类危害极其严重的小型节肢动物,不论从人的健康方面还是农牧林生产方面来说都需要防治及至根除。主要钛螨类的形态特征、生活史、生态类群、对人类的危害及其防治等5个方面简述了我国螨类研究的最新研究进展概况。     

Synthesis of the immunosuppressive agent 2-morpholinoethyl mycophenolate by a lipase-catalyzed transesterification

The synthesis of 2-morpholinoethyl mycophenolate was realized by an enzymatic transesterification of simple esters of mycophenolic acid with 2-morpholinoethanol. Best results were achieved by a Candida antarctica lipase B (CAL B) catalyzed transesterification of ethyl mycophenolate in toluene. CAL B showed to selectively transform only the ethyl ester function leaving unreacted the other functional groups present on the substrate. By this way 2-morpholinoethyl mycophenolate was obtained in satisfactory yields from mycophenolic acid (84%).     

Age-related changes on marking, marking-like behavior and the scent gland in adult Mongolian gerbils (Meriones unguiculatus).

Marking behavior, marking-like behavior [3], and changes of the scent glands were observed in aged Mongolian gerbils. In Experiment 1, changes in the marking and marking-like behavior with aging were evaluated in adult male and female Mongolian gerbils of an inbred strain aged 6 to 36 months. The frequency of marking behavior in males was significantly higher than females throughout the observation period except at 36 months of age. On the other hand, frequency of marking-like behavior in males, but not in females decreased with aging, significantly. In Experiment 2, changes of the scent gland in adult males and females aged 6 to 36 months were morphologically evaluated. Macroscopic examination revealed an increase in the size length and width of the glands of males aged 12 months and females aged 6 months. Histologically the glands of all the males and females aged 6 months developed moderately or well. Some of the 12-month-old males and females showed acinar atrophy of the glands, and all the females aged 18 months or more had highly atrophied scent glands. From these results, we concluded that there is no relationship between the changes of marking behavior and those of the scent glands in aged male Mongolian gerbils, and assume that marking behavior in aged animals does not have an important meaning as marking. In Experiment 3, marking and marking-like behavior in castrated adult Mongolian gerbils aged 16 weeks were observed. The result showed that marking behavior, not marking-like behavior was inhibited after castration. From these findings, we consider that generally marking behavior in Mongolian gerbils consists of androgen-dependent marking behavior and androgen-independent marking behavior (marking-like behavior).     

新疆地区白念珠菌基因型分析及其体外药物敏感性研究

目的研究新疆地区汉族和维吾尔族患者来源的50株白念珠菌的基因型及其对两性霉素B、5-氟胞嘧啶、米卡芬净、伊曲康唑、氟康唑和咪康唑的体外敏感性。方法采用PCR法扩增白念珠菌rDNA 25S的Ⅰ类内含子包含区,根据扩增产物的大小判断基因型(A型为450 bp,B型为840 bp,C型为450 bp和840 bp)。采用CLSI M27-A液基微量稀释法测定50株白念珠菌对上述6种抗真菌药的体外敏感性。结果 50株菌分为3种基因型:A型30株,B型和C型各10株。所有菌株对两性霉素B、5-氟胞嘧啶、米卡芬净和咪康唑的MIC值较低,MIC范围依次为0.25～0.5μg/mL,0.125～0.5μg/mL,≤0.03μg/mL,0.25～8μg/mL;对伊曲康唑和氟康唑的MIC值较高,MIC范围分别为0.25～8μg/mL,0.5～64μg/mL。B型和C型对5-氟胞嘧啶的MIC值均为0.125μg/mL,对伊曲康唑和氟康唑的耐药率分别为84%、70%。不同族别来源的菌株基因型比较无显著差异(P>0.05),不同基因型菌株的抗真菌药物敏感性比较也无显著差异(P>0.05)。结论新疆地区白念珠菌分A,B,C三种基因型。汉...     

菊苣基生叶中总黄酮提取工艺的研究

采用分光光度法,以亚硝酸钠、硝酸铝、氢氧化钠为试剂,芦丁为对照品,乙醇回流提取菊苣基生叶中总黄酮.在提取过程中,通过单因素实验分析了乙醇浓度、回流温度、回流时间及料液比等4个主要因素对提取率的影响.在单因素的基础上,通过正交实验,得到最佳提取工艺为:乙醇浓度为70%,料液比1:40,回流温度80℃,回流时间为2h.实验结果可靠,方法简便,最佳条件适合批量生产中该药材的提取.     

Time-course changes in potential biomarkers detected using a metabonomic approach in Walker 256 tumor-bearing rats

A metabonomic approach based on complementary hydrophilic interaction chromatography and reversed-phase liquid chromatography combined with tandem mass spectrometry and time-course analysis of metabolites was implemented to find more reliable potential biomarkers in urine of Walker 256 tumor-bearing rats. A major challenge in metabonomics is distinguishing reliable biomarkers that are closely associated with the genesis and progression of diseases from those that are unrelated but altered significantly. In this study, these biomarkers were selected according to the change trends of discriminating metabolites during the genesis and progression of cancer. Seven consecutive batches of urine samples from preinoculation to 16 days after were collected and analyzed. Multivariate analysis revealed 87 discriminating metabolites. Time-course analysis of discriminating metabolites was used to select more reliable biomarkers with regular and reasonable change trends. Finally, 47 were found and 15 were identified including 12 carnitine derivatives, 2 amino acid derivatives, 1 nucleoside. On the basis of time-course behaviors of these potential biomarkers, we hypothesize such disruption might result from elevated cell proliferation, reduced β-oxidation of fatty acids, and poor renal tubular reabsorption. These studies demonstrate that this method can help to find more reliable potential biomarkers and provide valuable biochemical insights into metabolic alterations in tumor-bearing biosystems.     

H2O2 induces abnormal tail flexure in Xenopus embryos: similarities with Paraquat teratogenic effects

BACKGROUND: As previously shown, Paraquat (PQ) treatments of Xenopus developing embryos mainly induce a characteristic developmental alteration we named "abnormal tail flexure." PQ oxidative activity has been indicated as the cause of this malformation. Since PQ evokes reactive oxygen species (ROS), among which hydroxyl radicals (OH(*)), and H(2)O(2) can be converted to (OH(*)) via Fenton reaction, we compared here the lethal and teratogenic potentials of both oxidants by using the Frog Embryo Teratogenesis Assay-Xenopus (FETAX), in order to grasp eventual similarities in their teratogenic activity. METHODS: Xenopus embryos were exposed, from stage 8 to stage 47, at 368, 491, 612, and 735 microM H(2)O(2) and 0.388 microM PQ. The probit analysis of H(2)O(2) mortality and malformed larva percents gave a 598.82 microM Lethal Concentration 50% (LC(50)) and 536.04 microM Teratogenic Concentration 50% (TC(50)) from which a 1.11 Teratogenic Index (T.I.) has been calculated. This T.I. value should allow the classification of H(2)O(2) as a non-teratogenic compound. RESULTS: A comparison of H(2)O(2) mortality and malformed larva percents with those obtained from PQ exposure showed the higher embryotoxicity of PQ, but, markedly, both compounds mainly induced the "abnormal tail flexure." Histological analysis of both H(2)O(2) and PQ malformed embryo tails showed a similar distorted morphology of both somites and myocytes. Some of muscle cells were necrotic and affected by an apical enlargement as well as a detachment from the connective tissue of intersomitic boundaries. CONCLUSIONS: In our opinion, both of the tested chemicals likely weaken the mechanical bridge connecting the myocyte contractile apparatus to the extracellular matrix, therefore causing the detachment of some of tail myocytes from their connectival septum as well as their apical enlargement. This could lead to the unbalance of tail tensional forces and, in turn, to the appearance of the "abnormal tail flexure."     

Emericella appendiculata, a new species from Chinese soil

Emericella appendiculata, a new species isolated from soil of the Pamire Plateau, is described and illustrated. It is characterized by grayish green non-ostiolate ascomata surrounded by a thick layer of hülle cells, membranaceous peridium, prototunicate asci, violet-brown, lenticular ascospores which are ornamented by two stellate equatorial crests, capitate convex surfaces, and long filiform appendages, and anAspergillus anamorph with biseriate conidiogenous cells.