Exploring Chemical Variables in Ligustrum lucidum Ait. F. Tricolor (Rehd.) Rehd. in Relation to Air Pollutants and Environmental Conditions

Ligustrum lucidum Ait. f. tricolor (Rehd.) Rehd. in relation to atmospheric pollutants in Córdoba city, Argentina. The study area receives regional pollutants and was categorized taking into account traffic level, industrial density, type of industry, location of the sample point in relation to the street corner, treeless condition, and topographic level. Dried weight/fresh weight ratio (DW/FW) and specific leaf area (SLA) were calculated, and concentrations of chlorophylls, carotenoids, total sulfur, soluble proteins, malondialdehyde (MDA), and hydroperoxy conjugated dienes (HPCD) were determined in leaf samples. Sulfur content correlates positively with traffic density and SLA correlates negatively with some combinations of the categorical variables; MDA correlates positively with topographic level and total protein concentration correlates negatively with treeless condition. On the basis of our results, traffic, location of trees, type of industry, situation of a tree with respect to others, and topographic level are the environmental variables to bear in mind when selecting analogous sampling points in a passive monitoring program. An approximation to predict tree injury may be obtained by measuring DW/FW ratio, proteins, pigments, HPCD, and MDA as they are responsible for the major variability of data.     

Effect of Mountain Relief and Industrial Air Pollution on Biometric Characteristics of Pine Stands

The effect of mountain relief and industrial air pollution on biometric parameters of pine stands was studied. The empirical–statistical models of the dependence of biometric characteristics on the parameters of forest sites were developed using raster modeling and multivariate analysis. The possibility of predicting changes in the biometric parameters at any site on the basis of these models is shown.     

Role of glycine on sulfuric acid-ammonia clusters formation: Transporter or participator

Glycine(Gly) is ubiquitous in the atmosphere and plays a vital role in new particle formation(NPF).However,the potential mechanism of its on sulfuric acid(SA)-ammonia(A)clusters formation under various atmospheric conditions is still ambiguous.Herein,a(Gly)_x·(SA)_y·(A)_z(z≤x+y≤3) multicomponent system was investigated by using density functional theory(DFT) combined with Atmospheric Cluster Dynamics Code(ACDC) at different temperatures and precursor concentrations.The results show that Gly,with one carboxyl(-COOH) and one amine(-NH_2) group,can interact strongly with SA and A in two directions through hydrogen bonds or proton transfer.Within the relevant range of atmospheric concentrations,Gly can enhance the formation rate of SA-A-based clusters,especially at low temperature,low [SA],and median [A].The enhancement(R) of Gly on NPF can be up to 340 at T=218.15 K,[SA]=10~4,[A]=10~9,and [Gly]=10~7 molecules/cm~3.In addition,the main growth paths of clusters show that Gly molecules participate into cluster formation in the initial stage and eventually leave the cluster by evaporation in subsequent cluster growth at low [Gly],it acts as an important "transporter" to connect the smaller and larger cluster.With the increase of [Gly],it acts as a "participator" directly participating in NPF.     

土壤中的铅对三种蔬菜的影响

通过温室栽培萝卜、青菜和莴苣,研究土壤中的铅对蔬菜生长的影响及其在器官中的残留。在低浓度下,铅对蔬菜生长有不同程度的刺激作用。土壤有效态铅浓度与蔬菜各器官含铅浓度存在显著性正相关(P<0.05)。不同蔬菜对铅的敏感性、耐受力不同。     

L型栓子成形及模具结构

简要论述了L型栓子的成形方法、注意事项与模具结构,其方法简单可靠.     

真,假草本咖啡种子的鉴别

在对草本咖啡（Ｃａｓｓｉａｓｏｐｎｅｒａｉｉｎｎ）、望江南（ＣａｓｓｉｓｏｃｃｉｄｅｎｔａｌｉｏＬ．）和决明（ＣａｓｓｉａｔｏｒａＬ．）种子的大小、颜色、形态进行了观察、研究，并对其形态特征进行了解剖学的分析后，提出了鉴别３种种子的方法。     

野生一年蓬的开发利用

阐述了野生植物一年蓬的植物学特性、分布习性、化学成分、开发利用价值等，为其进一步开发利用乃至产业化、现代化生产提供参考。     

菝葜水煎液抗炎活性的实验研究

目的：探讨菝葜水煎液的抗炎活性。方法：利用巴豆油合剂致小鼠耳肿胀、醋酸致小鼠胸膜炎和皮下植入棉球致小鼠生长肉芽等3个实验模型研究菝葜水煎液的抗炎活性。结果：菝葜水煎液对巴豆油合剂引起的小鼠耳肿胀具有显著的抑制作用，而对醋酸引起的小鼠胸膜炎和皮下棉球引起的小鼠肉芽肿则仅有一定的抑制作用。结论：菝葜水煎液具有一定的抗炎活性。     

Effect of selected and non-selected urban waste compost on the initial growth of corn

Brazil produces approximately 242,000 t of waste per day, 76% of it being dumped outdoors and only 0.9% recycled, including composting, which is an alternative still little known in Brazil. In search of a better destination for residues produced by domestic activities, composting stands as a feasible alternative. Organic compost from waste may be used for various purposes, among which are soil recovery, commercial production, pastures, lawns and reforestry and agriculture. However, the quality of the compost determines the growth and the development of plants. The effect of compost made from urban waste on corn plant (Zea mays L.) growth was investigated. Two types of compost were used: the selected compost (SC), produced from organic waste selectively collected; and the non-selected compost (NSC), taken from a 15-year-old cell from the Canabrava land-fill, located in Salvador, Bahia, Brazil (altitude 51 m, 12°22′–13°08′S, 38°08′–38°47′W). Corn was seeded in polyethylene pots, with soil-compost mixing substrate in the proportion of 0, 15, 30, 45 and 60 t ha⁻¹ equivalent doses. Chemical analyses of the compost and growth properties of the plant like chlorophyll content; height and stem diameter; aerial and radicular dry biomasses, were used to evaluate compost quality. Plants cultivated with SC presented a superior gain, being of 52.5% in stem diameter, 71.1 and 81.2% in root and stem biomasses, respectively. Chlorophyl content alterations were observed in plants from treatments using 30 t compost ha⁻¹ dose onwards. Conventional and multivariate statistical methods were used to evaluate these results. The beneficial action of organic compost in plant growth was confirmed with this research.     

砷-菲对蜈蚣草根部不同碳基团的影响

采用离体鲜根实验和固态13C核磁共振技术(13C-NMR)研究蜈蚣草根部对砷和菲的吸收特征及根部碳基团的影响作用.结果表明,蜈蚣草根部在无蒸腾作用的条件下能够有效地吸收砷和菲,添加菲能够促进离体鲜根对砷的吸收,添加砷也可提高菲的吸收,与对照相比,菲提高了15%~53%.蜈蚣草离体鲜根中以烷氧基C为主,羧基C比例最低,且主要为羧酸、酯和酰胺类羧基C,添加砷和菲会显著增加蜈蚣草离体鲜根中羧基C的比例.蜈蚣草离体鲜根为应对砷和菲的胁迫形成了分子结构更为稳定和复杂的芳香类有机质,从而提高离体鲜根的抗性和适应性.