Mercury in the Aquatic Environment of the Village of Caimito at the Mojana Region,North of Colombia   总被引：1，自引：0，他引：1  

Olivero-Verbel  Jesus  Johnson-Restrepo  Boris  Mendoza-Marín  Claudia  Paz-Martinez  Ramon  Olivero-Verbel  Rafael 《Water, air, and soil pollution》2004,159(1):409-420

During May–September 1999, several aquatic environmental samples were collected from the village of Caimito, in the San Jorge River basin area, state of Sucre (Colombia), and analyzed for total mercury (T-Hg). Mean T-Hg concentration in sediments from surrounded marshes was 0.155 ± 0.016 g Hg/g. Low Hg concentrations were found in the phytoplanktivorous fish species Prochilodus magdalenae (0.087 ± 0.01 g Hg/g), while four-fold greater concentrations were found in all the carnivorous species. In average, T-Hg concentrations for fish samples did not exceed the limit consumption level (0.5 g Hg/g). However, risk assessment based on the hazard index suggested that the consumption of 0.1 kg per day of carnivorous fish could increase the risk of mercury poisoning in local population.  相似文献   

Habitat selection by the pale-headed brush-finch (Atlapetes pallidiceps) in southern Ecuador: implications for conservation     

Steffen Oppel  H.Martin Schaefer  Boris Schröder 《Biological conservation》2004,118(1):33-40

The pale-headed brush-finch (Atlapetes pallidiceps) is threatened with extinction due to habitat loss, but very little is known about its ecological requirements. We used multiple logistic regression to study habitat selection of this species at landscape, territory, and nest site scales in order to make recommendations about effective management. Habitat selection by the sympatric stripe-headed brush-finch (Buarremon torquatus) was examined with the same methods in order to analyse interspecific resource partitioning and potential competition. The pale-headed brush-finch selected semi-open habitat types with intermediate scrub heights, and avoided forests. Nest sites depended on the presence of vines or bamboo. By contrast, the stripe-headed brush-finch chose dense habitat with low ground cover under tall vegetation and avoided semi-open habitat. The two species had overlapping territories but differed significantly in microhabitat use and the use of vegetation strata. We found no convincing evidence that the stripe-headed brush-finch displaces the pale-headed brush-finch from optimal habitat. The preservation of semi-open scrubland maintained by low-intensity grazing is suggested for future conservation of the pale-headed brush-finch.  相似文献   

Immunomodulatory effect of glucan on specific and nonspecific immunity after vaccination in puppies     

Haladová E  Mojžišová J  Smrčo P  Ondrejková A  Vojtek B  Prokeš M  Petrovová E 《Acta veterinaria Hungarica》2011,59(1):77-86

The objective of the study was to determine the immunostimulatory effect of β-(1,3/1,6)-D-glucan in puppies. The effect exerted on the efficacy of vaccination, especially against canine parvovirus and rabies infection, was studied. The application of vaccine and glucan leads to significant increases in the nonspecific immunological parameters (phagocytic ability of leukocytes, blastogenic response of lymphocytes, metabolic and chemotactic activity of polymorphonuclear cells). The level of antibodies against canine parvovirus (Ab CPV) and rabies infection reached the most statistically significant values on the 28th day after the application of vaccine and a syrup containing β-(1,3/1,6)-D-glucan (Group GV) as compared to the control group (Group V, puppies receiving only vaccine). Dogs without glucan supplementation did not produce such significant levels of antibodies. We can conclude that glucan has relevant immunostimulatory effects in dogs with altered immunity. The glucan product tested in this study (PleraSAN V, PLEURAN, Bratislava, Slovakia) could be used in the small animal clinical practice.  相似文献   

Modeling aluminum solubility in intrazonal podzols using WHAM‐S/Model V     

Boris Jansen  Jan Mulder  Jacobus M. Verstraten 《植物养料与土壤学杂志》2005,168(3):325-333

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Response of a white clover indicator system to tropospheric ozone at eight locations in the United States     

Allen S. Heagle  Joseph E. Miller  Boris I. Chevone  Thomas W. Dreschel  William J. Manning  Patrick M. McCool  C. Lynn Morrison  Grady E. Neely  Joanne Rebbeck 《Water, air, and soil pollution》1995,85(3):1373-1378

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Variability in microsatellite DNA markers in gynogenetic and backcross progenies obtained from ornamental (koi) carp (Cyprinus carpio L.) × goldfish (Carassius auratus L.) hybrid females          下载免费PDF全文

Ammu Anil  Boris Gomelsky  Kyle J Schneider 《Aquaculture Research》2016,47(4):1150-1155

Inheritance and segregation at five microsatellite loci were studied in diploid gynogenetic and triploid backcross progenies obtained from koi × goldfish hybrid females, which produce diploid eggs. Gynogenetic and backcross progenies were obtained from three individual hybrid females by inseminating eggs with genetically inactivated and intact sperm of parental species respectively; no shock treatments were applied to the early embryos. Complete absence of paternally specific alleles at all investigated microsatellite loci has proven successful genetic inactivation of spermatozoa by irradiation and confirmed gynogenetic origin of progenies. Genotypic segregations at microsatellite loci showed almost complete homogeneity of gynogenetic progenies and their identity to female parents. These results correspond with previous cytogenetic data on the occurrence of premeiotic endomitosis in hybrid females producing diploid eggs. Fish from triploid backcross progenies had genotypes resulting from combination of entire diploid female genome and haploid genome from male.  相似文献   

Occurrence of pathogens in outbreak populations of <Emphasis Type="Italic">Pityokteines</Emphasis> spp. (Coleoptera,Curculionidae, Scolytinae) in silver fir forests     

Milan Pernek  Dinka Matošević  Boris Hrašovec  Mladen Kučinić  Rudolf Wegensteiner 《Journal of pest science》2009,82(4):343-349

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A recombinant flagellin fragment,which includes the epitopes flg22 and flgII-28, provides a useful tool to study flagellin-triggered immunity     

Serena Ciarroni  Christopher R. Clarke  Haijie Liu  Noam Eckshtain-Levi  Angelo Mazzaglia  Giorgio M. Balestra  Boris A. Vinatzer 《Journal of General Plant Pathology》2018,84(3):169-175

Plants and animals independently evolved the ability to recognize flagellin (also called FliC), the building block of the bacterial flagellum, as part of their innate immune response. While animals recognize a relatively large region of FliC, most plants recognize one or two short epitopes of FliC: flg22 and flgII-28. However, since most research in plants has focused on flg22 and flgII-28 and not the actual FliC protein, the importance of any FliC region beyond the two epitopes in plant immunity is poorly understood. Here we report cloning, overexpression, and purification of a Pseudomonas syringae FliC fragment from amino acid 1 to 143, which includes both FliC epitopes and the adjacent alpha helices. Exposing Arabidopsis thaliana leaves to FliC_1–143 did not reveal any additional FliC recognition capabilities beyond flg22. However, while the kiwifruit species Actinidia arguta did not respond to either flg22 or flgII-28, treatment of A. arguta leaves with FliC_1–143 triggered a significant reactive oxygen response, indicating recognition. This result suggests that in some plant species, recognition of FliC requires regions of FliC beyond the two well-known epitopes and that FliC_1–143 represents a useful tool in the study of plant immunity.  相似文献   

Diverse antimicrobial killing by Enterococcus faecium E 50-52 bacteriocin     

Svetoch EA  Eruslanov BV  Perelygin VV  Mitsevich EV  Mitsevich IP  Borzenkov VN  Levchuk VP  Svetoch OE  Kovalev YN  Stepanshin YG  Siragusa GR  Seal BS  Stern NJ 《Journal of agricultural and food chemistry》2008,56(6):1942-1948

An effective bacteriocin was identified and characterized. Lactic acid bacteria were screened against Campylobacter jejuni. One bacteriocin producer, Enterococcus faecium (NRRL B-30746), was studied. The isolate was grown, and the bacteriocin was purified to single-band homogeneity. Biochemical traits indicated that the peptide was a Class IIa bacteriocin, and it was named E 50-52. The bacteriocin had a molecular weight of 3339.7 and an isoelectric point of 8.0. The minimal inhibitory concentrations of E 50-52 against C. jejuni, Yersinia spp., Salmonella spp., Escherichia coli O157:H7, Shigella dysenteriae, Morganella morganii, Staphylococcus spp., and Listeria spp. ranged from 0.025 to 32 microg/mL. In therapeutic broiler trials, oral treatment with E 50-52 reduced both C. jejuni and Salmonella enteritidis by more than 100,000-fold in the ceca, and systemic S. enteritidis was reduced in the liver and spleen. The wide range of antibacterial activity of bacteriocin E 50-52 against pathogens provides a promising alternative to antibiotics.  相似文献   

Soil nutrient status,yield and quality of lemon (Citrus limon Burm.) cv. ‘Assam lemon’ as influenced by bio-fertilizers,organics and inorganic fertilizers     

T. K. Hazarika  Boris Aheibam 《Journal of plant nutrition》2019,42(8):853-863

An experiment was conducted at Mizoram University, Aizawl, India during 2015-2017 to study the effect of integrated nutrient management on yield and quality of lemon cv. ‘Assam lemon’ (Citrus limon Burm.). The experiment was comprised of nine treatments viz. T1: 100% recommended dose of fertilizers (RDF) through inorganic fertilizers (IF); T2: 100% N through Farm Yard Manure (FYM); T3: 75% N through FYM + 25% through IF; T4: 50% N through FYM + 50% through IF; T5:75% N through FYM +25% through IF + Azotobacter + phosphate solubilizing bacteria (PSB)+ potash solubilizing bacteria (KSB); T6: 50% N through FYM + 50% through IF+ Azotobacter + PSB?+?KSB; T7: 75% N through FYM + 25% through IF?+?Azospirillum + AMF?+?KSB; T8: 50% N through FYM + 50% through IF+ Azospirillum + arbuscular mychorrhizal fungi (AMF) + KSB; T9: control. Among all treatments, T5 recorded highest value with respect to growth, yield and soil quality. While, T7 showed superiority in quality characters.  相似文献