Breakfast habits among European adolescents and their association with sociodemographic factors: the HELENA (Healthy Lifestyle in Europe by Nutrition in Adolescence) study     

Hallström L  Vereecken CA  Labayen I  Ruiz JR  Le Donne C  García MC  Gilbert CC  Martínez SG  Grammatikaki E  Huybrechts I  Kafatos A  Kersting M  Manios Y  Molnár D  Patterson E  Widhalm K  De Vriendt T  Moreno LA  Sjöström M 《Public health nutrition》2012,15(10):1879-1889

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PiggyBac transposon mutagenesis: a tool for cancer gene discovery in mice   总被引：1，自引：0，他引：1  

Rad R  Rad L  Wang W  Cadinanos J  Vassiliou G  Rice S  Campos LS  Yusa K  Banerjee R  Li MA  de la Rosa J  Strong A  Lu D  Ellis P  Conte N  Yang FT  Liu P  Bradley A 《Science (New York, N.Y.)》2010,330(6007):1104-1107

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Does forest continuity matter in conservation? - A study of epiphytic lichens and bryophytes in beech forests of southern Sweden   总被引：1，自引：0，他引：1  

Örjan Fritz  Lena Gustafsson 《Biological conservation》2008,141(3):655-668

The effects of forest continuity at local scale for red-listed and indicator species of epiphytic lichens and bryophytes were investigated in 150 Fagus sylvatica stands in southern Sweden. Stands having forest continuity (n = 106) had continuous forest cover more than 350 years, whereas stands lacking continuity (n = 44) had forest cover less than 160 years. Forest continuity was identified by comparing a sequence of historical maps with a modern survey of beech forests. In the field woody beech substrates were searched for the epiphytes of interest. A number of environmental and spatial variables were inventoried and compiled for each stand. In all 64 species (51 lichens, 13 bryophytes) were found in the stands having continuity, and 21 (14 lichens, 7 bryophytes) in the stands lacking continuity. Controlling for the different number of surveyed stands, stands having continuity had significantly more species of lichens, but not of bryophytes. In the stands lacking continuity we did not find lichens associated with the very late succession stage. The quantity of substrates, stand age and forest continuity were the three most important factors explaining species richness as well as composition of studied epiphytes. The effect of continuity was probably due to a combination of a higher substrate quality, mainly old beeches, and a longer time available for colonization. Also, we found strong positive correlations between number of indicator and red-listed epiphyte species. In short-term conservation old stands having continuity, containing suitable substrates and indicator species are target areas.  相似文献   

Aqueous Pb Reduction in Pb-Contaminated Soils by Florida Phosphate Rocks   总被引：1，自引：0，他引：1  

Ma  Lena Q.  Rao  Gade N. 《Water, air, and soil pollution》1999,110(1-2):1-16

Lead contamination is of great environmental concern due to its effect on human health. This study investigated the feasibility of using Florida phosphate rocks (PR) to immobilize aqueous Pb from Pb-contaminated soils. Occidental Chemical PR effectively immobilized Pb from 13 Pb-contaminated soils, but its effectiveness was affected by soil pH and extent of Pb contamination, with aqueous Pb reduction ranging from 21.8 to 100%. Longer reaction times improved aqueous Pb reduction. Six out of 7 Florida PR effectively immobilized aqueous Pb from the Burch Loam soil. Phosphate rock from Cargil Fertilizer was ineffective, with aqueous Pb reduction of 4.73%. The relative effectiveness of 6 Florida PR to immobilize aqueous Pb, excluding Cargil Fertilizer PR, was: Occidental Chemical > CF Chemical > Nu Gulf Industries > Agri-Chemical > IMC > Agrico Chemical. Phosphate rock solubility (as estimated by acid extraction and X-ray diffraction) failed to predicate the effectiveness of PR to immobilize aqueous Pb from Pb-contaminated soils, partially due to the complexity and kinetics of reactions between PR and soils. Our results demonstrate that PR has a potential to cost-effectively treat Pb-contaminated soils.  相似文献   

Astaxanthin krill oil enhances the growth performance and fatty acid composition of the Pacific whiteleg shrimp,Litopenaeus vannamei,reared under hypersaline conditions          下载免费PDF全文

O.S. Castro  L. Burri  A.J.P. Nunes 《Aquaculture Nutrition》2018,24(1):442-452

Hypersalinity culture of marine shrimp can lead to poor growth and feed efficiency. This study evaluated the effect of dietary supplementation of three oil sources (krill, fish and soybean) on the growth of Litopenaeus vannamei reared under high salinity. Shrimp of 2.79 ± 0.60 g were reared for 64 days under isosmotic (ISO, 23 ± 1.2 g/L) and hyperosmotic (HOS, 44 ± 2.0 g/L) conditions. Diets varied in their fatty acid composition: Control, 35 g/kg of the diet (as fed basis) soybean oil; Fish, 27 g/kg fish oil and 10 g/kg soybean oil; Krill, 48 g/kg krill oil and 4 g/kg soybean oil; Krill‐, 15 g/kg krill oil and 21 g/kg soybean oil; Krill+, 55 g/kg krill oil and 4 g/kg soybean oil. At harvest, Krill diet promoted the fastest shrimp growth (1.01 ± 0.01 g/week) and body weight (11.97 ± 2.01 g), regardless of water salinity. There were no significant differences in shrimp survival (93.4 ± 5.07%) and yield (554 ± 68.5 g/m²) among different diets. Shrimp fed Fish, Krill and Krill+ had higher concentrations of PUFA compared to those fed Control and Krill‐ diets.  相似文献   

Dormancy breaking in Fagus sylvatica seeds is linked to formation of abscisic acid-glucosyl ester     

Vondráková  Zuzana  Pešek  Bedřich  Malbeck  Jiří  Bezděčková  Lena  Vondrák  Tomáš  Fischerová  Lucie  Eliášová  Kateřina 《New Forests》2020,51(4):671-688

New Forests - Seed dormancy is an adaptive mechanism that allows seed germination under suitable environmental conditions. Germination of stored dormant seeds proceeds after dormancy breaking...  相似文献   

Nature’s Lab for Derivatization: New and Revised Structures of a Variety of Streptophenazines Produced by a Sponge-Derived Streptomyces Strain     

Anna Lena Kunz  Antje Labes  Jutta Wiese  Torsten Bruhn  Gerhard Bringmann  Johannes F. Imhoff 《Marine drugs》2014,12(4):1699-1714

Eight streptophenazines (A–H) have been identified so far as products of Streptomyces strain HB202, which was isolated from the sponge Halichondria panicea from the Baltic Sea. The variation of bioactivities based on small structural changes initiated further studies on new derivatives. Three new streptophenazines (I–K) were identified after fermentation in the present study. In addition, revised molecular structures of streptophenazines C, D, F and H are proposed. Streptophenazines G and K exhibited moderate antibacterial activity against the facultative pathogenic bacterium Staphylococcus epidermidis and against Bacillus subtilis. All tested compounds (streptophenazines G, I–K) also showed moderate activities against PDE 4B.  相似文献   

Prevalence of antibodies against feline coronavirus and Chlamydophila felis in Swedish cats     

Holst BS  Englund L  Palacios S  Renström L  Berndtsson LT 《Journal of Feline Medicine and Surgery》2006,8(3):207-211

Serum samples from 214 Swedish cats with no signs of infectious disease were analysed for the presence of antibodies against Chlamydophila felis (Cp felis), while 209 of these were also analysed for feline coronavirus (FCoV) antibodies. The prevalence of antibodies against Cp felis was 11%, with no significant difference between purebred and mixed breed cats. The overall prevalence of antibodies against FCoV was 31%, significantly higher among pure breed cats (65%) than among mixed breed cats (17%). A high proportion of cats with antibodies against FCoV had relatively high antibody titres, and was therefore likely to be shedding FCoV in faeces. For Cp felis, the majority of seropositive animals had relatively low antibody titres, and the risk of these animals infecting others is not known.  相似文献   

基于ARM的温室环境数据采集与控制系统设计     

苗凤娟  王喆  陶佰睿  刘统凯  杨乐娜 《农机化研究》2015,(3):138-141

针对露水凝结在温室农作物叶表面,诱发由真菌和细菌引起的疾病,危害农作物的生长现象,采用ARM微控制器为核心,利用DHT11温湿度传感器来接收采集温室环境信息。同时,根据需求通过矩阵键盘设定温湿度额度值,由液晶1602实时监测当前环境变化,数据处理模块对信息进行比较分析,判定是否需进行升降温,加湿或干燥的控制,使得温室能够处在一个适宜农作物生长的恒定温湿度状态。实验模拟表明,该系统能有效工作,在温室大棚内具有很好的推广价值。  相似文献   

Effect of earthworm casts on protein synthesis inAgaricus bisporus     

E. Galli  U. Tomati  A. Grappelli  G. Di Lena 《Biology and Fertility of Soils》1990,9(4):290-291

Summary When earthworm casts were used as a casing, an early fructification, a greater stimulation in fruitbody formation, an increase in the carpophore protein content and in L-¹⁴C-leucine incorporation were observed inAgaricus bisporus. The protein-synthesizing capacity of the carpophore and its protein content were tested on samples collected 28 and 35 days after the casing. An increased L-¹⁴C-leucine incorporation of about 34% and an increased protein content of about 25% were recorded.  相似文献