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Sample records for acipenser transmontanus early

  1. Effects of Columbia River water on early life-stages of white sturgeon (Acipenser transmontanus).

    Science.gov (United States)

    Tompsett, Amber R; Vardy, David W; Higley, Eric; Doering, Jon A; Allan, Marcie; Liber, Karsten; Giesy, John P; Hecker, Markus

    2014-03-01

    The white sturgeon (Acipenser transmontanus) population that resides in the Columbia River in British Columbia (BC), Canada, has suffered recruitment failures for more than three decades. During the summers of 2008 and 2009, studies were performed to determine whether exposure to water downstream of a metal smelter in Trail, BC affected survival or growth of early life-stages of white sturgeon through 60+ days post-fertilization (dpf). In both years, there were no significant differences in survival of fish that were exposed to water from downstream compared to water from upstream of the smelter. At 20-21dpf, average mortality was 2.4 percent and 12 percent in upstream water for 2008 and 2009, respectively, which was similar to the average mortality of 3.8 percent and 7.2 percent in downstream water for 2008 and 2009, respectively. Relatively great mortality after 20-21dpf complicated analysis of the subchronic exposure, but use of a survival analysis indicated that the average fish died at 25-29dpf, regardless of whether the water to which they were exposed came from upstream or downstream of the smelter. In addition, measured concentrations of metals in river water were less than the threshold for adverse effects on early life stages of white sturgeon. Based upon these analyses, it is not likely that current concentrations of metals in the Columbia River in southern BC are adversely affecting survival of early life stages of white sturgeon larvae.

  2. Lethal and sublethal toxicity of didecyldimethylammonium chloride in early life stages of white sturgeon, Acipenser transmontanus.

    Science.gov (United States)

    Teh, Swee Joo; Wong, Cecilia; Furtula, Vesna; Teh, Foo-Ching

    2003-09-01

    This study was conducted to describe the acute lethality and latent toxicity of didecyldimethylammonium chloride (DDAC) on early life stages of white sturgeon (Acipenser transmontanus). Fish responses to 0, 10, 50, 100, 250, 500 microg/L concentrations of DDAC were determined using a 96-h standard static renewal method for acute toxicity testing, with three replicates per concentration. Twenty fish per replicate were tested for 3, 11, and 42-d-old larvae, and 7 fish per replicate were tested for 78-d-old juveniles. Following exposure, survival and growth were evaluated in exposed fish raised in clean water for 2 weeks. The 96-h median lethal concentration (LC50) values for DDAC were 10.0 to 50.0, 58.5, and 99.7 microg/L for 3, 11, and 42-d-old larvae and 100 to 250 microg/L for 78-d-old juveniles. Significant decreases in larval growth and survival were noted at all tested concentrations and in all sturgeon age groups. Results of this study reveal age- and concentration-dependent responses to DDAC. Among the age groups tested, the 3-d-old larvae were the most sensitive group. Results also revealed that 96-h lethality testing alone is not adequate for determining the toxicity of DDAC to white sturgeon.

  3. Effects of subchronic exposure of early life stages of white sturgeon (Acipenser transmontanus) to copper, cadmium, and zinc.

    Science.gov (United States)

    Vardy, David W; Tompsett, Amber R; Sigurdson, Jacinda L; Doering, Jon A; Zhang, Xiaowei; Giesy, John P; Hecker, Markus

    2011-11-01

    Populations of sturgeon (Acipenseridae) are declining in many places in the world because of several potential factors, including overharvesting, habitat alteration, and pollution. In North America, populations of the white sturgeon (Acipenser transmontanus) have been experiencing poor annual recruitment in major river systems for more than three decades. Metal pollution has been hypothesized as a potential contributing factor to the poor recruitment in some of the water bodies. In general, little is known about the toxicity of metals such as Cu, Cd, and Zn to white sturgeon and their potential influence on survival of embryos and juveniles. The present study was conducted to establish baseline toxicity data for the subchronic exposure of early life stages of white sturgeon to Cu, Cd, and Zn that can be used in metal-related risk assessments. Embryos, larvae, and fry were exposed to increasing concentrations of dissolved Cu, Cd, or Zn for 66 d using laboratory-based flow-through exposure systems. Hatching success was greater than 79% for all controls, and no significant differences were observed among treatment groups or between treatments and controls. Chronic lethal concentrations at which 20% mortality occurred (LC20s) for Cd (1.5 µg/L), Cu (5.5 µg/L), and Zn (112 µg/L) obtained for white sturgeon in the present study were comparable to those of sensitive salmonid species. Based on LC20 values for 19 or 58 d posthatch white sturgeon, the United States national ambient water quality criteria and the Canadian water quality guidelines for the protection of aquatic life that have been established for Cd, Cu, and Zn protect white sturgeon early life stages.

  4. Toxicity of smelter slag-contaminated sediments from Upper Lake Roosevelt and associated metals to early life stage White Sturgeon (Acipenser transmontanus Richardson, 1836)

    Science.gov (United States)

    Little, E.E.; Calfee, R.D.; Linder, G.

    2014-01-01

    The toxicity of five smelter slag-contaminated sediments from the upper Columbia River and metals associated with those slags (cadmium, copper, zinc) was evaluated in 96-h exposures of White Sturgeon (Acipenser transmontanus Richardson, 1836) at 8 and 30 days post-hatch. Leachates prepared from slag-contaminated sediments were evaluated for toxicity. Leachates yielded a maximum aqueous copper concentration of 11.8 μg L−1 observed in sediment collected at Dead Man's Eddy (DME), the sampling site nearest the smelter. All leachates were nonlethal to sturgeon that were 8 day post-hatch (dph), but leachates from three of the five sediments were toxic to fish that were 30 dph, suggesting that the latter life stage is highly vulnerable to metals exposure. Fish maintained consistent and prolonged contact with sediments and did not avoid contaminated sediments when provided a choice between contaminated and uncontaminated sediments. White Sturgeon also failed to avoid aqueous copper (1.5–20 μg L−1). In water-only 96-h exposures of 35 dph sturgeon with the three metals, similar toxicity was observed during exposure to water spiked with copper alone and in combination with cadmium and zinc. Cadmium ranging from 3.2 to 41 μg L−1 or zinc ranging from 21 to 275 μg L−1 was not lethal, but induced adverse behavioral changes including a loss of equilibrium. These results suggest that metals associated with smelter slags may pose an increased exposure risk to early life stage sturgeon if fish occupy areas contaminated by slags.

  5. Final critical habitat for the Kootenai River Population of the White Sturgeon (Acipenser transmontanus)

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — To provide the user with a general idea of areas where final critical habitat for White Sturgeon (Acipenser transmontanus) concerning the Kootenai River Population...

  6. A comparative gene index for the white sturgeon Acipenser transmontanus.

    Science.gov (United States)

    Lazzari, Barbara; Mariani, Valentina; Malinverni, Roberto; Caprera, Andrea; Giuffra, Elisabetta

    2008-03-01

    Sturgeons are archaic fishes phylogenetically distinct from Teleosts. They represent an important niche for aquaculture, particularly for the production of caviar and high quality fillets, while many natural populations in various world areas are today threatened by extinction. Knowledge of the sturgeon genome is limited, as it is the case of many other species of interest for fishery, aquaculture and conservation. Sequences from non-normalized libraries of skin and spleen of the American sturgeon (A. transmontanus) produced in our laboratories were analysed via a bioinformatic procedure, and compared to similar resources available for three Teleost species. Data collected during the analyses were stored in a database - the Sturgeon database (db) - that can be queried via a web interface. The Sturgeon db contains a total of 16,404 sequences from Acipenser transmontanus, Ictalurus punctatus, Salmo salar and Takifugu rubripes, each specie being represented by expressed sequence tags (ESTs) from skin and spleen. Data contained in the database are the results of a number of analyses that mostly focus on sequence annotation and intra- and inter-species comparison. Putative SNP sites, tandem repeats, and sequences matching known protein patterns and motifs were also identified. The Sturgeon db is by now the only online resource dedicated to the analysis of A. transmontanus EST sequences, and represents a starting point for the investigation of the genome of sturgeons from a physiological perspective; it will be used to identify polymorphic markers to study, for example, fish pathologies or to survey fish disease resistance, and to produce gene expression arrays. Introduction of sequences from other species in the analysis pipeline allowed inter-species comparisons of transcripts distribution in Gene Ontology categories, as well as orthologs identification, despite the high sturgeon phylogenetic distance from other fish species. As a result of the EST analysis procedure

  7. Acute toxicity of copper, lead, cadmium, and zinc to early life stages of white sturgeon (Acipenser transmontanus) in laboratory and Columbia River water.

    Science.gov (United States)

    Vardy, David W; Santore, Robert; Ryan, Adam; Giesy, John P; Hecker, Markus

    2014-01-01

    Populations of white sturgeon (Acipenser transmontanus) are in decline in North America. This is attributed, primarily, to poor recruitment, and white sturgeon are listed as threatened or endangered in several parts of British Columbia, Canada, and the United States. In the Columbia River, effects of metals have been hypothesized as possible contributing factors. Previous work has demonstrated that early life stage white sturgeon are particularly sensitive to certain metals, and concerns over the level of protectiveness of water quality standards are justified. Here we report results from acute (96-h) toxicity tests for copper (Cu), cadmium (Cd), zinc (Zn), and lead (Pb) from parallel studies that were conducted in laboratory water and in the field with Columbia River water. Water effect ratios (WERs) and sensitivity parameters (i.e., median lethal accumulations, or LA50s) were calculated to assess relative bioavailability of these metals in Columbia River water compared to laboratory water, and to elucidate possible differences in sensitivity of early life stage white sturgeon to the same concentrations of metals when tested in the different water sources. For Cu and Pb, white sturgeon toxicity tests were initiated at two life stages, 8 and 40 days post-hatch (dph), and median lethal concentrations (LC50s) ranged between 9-25 μg Cu/L and 177-1,556 μg Pb/L. LC50s for 8 dph white sturgeon exposed to Cd in laboratory water and river water were 14.5 and 72 μg/L, respectively. Exposure of 8 dph white sturgeon to Zn in laboratory and river water resulted in LC50s of 150 and 625 μg/L, respectively. Threshold concentrations were consistently less in laboratory water compared with river water, and as a result, WERs were greater than 1 in all cases. In addition, LA50s were consistently greater in river water exposures compared with laboratory exposures in all paired tests. These results, in combination with results from the biotic ligand model, suggest that the observed

  8. Bioaccumulation and chronic toxicity of dietary L-selenomethionine in juvenile white sturgeon (Acipenser transmontanus)

    OpenAIRE

    Tashjian, D H; Teh, S.J.; Sogomonyan, A; Hung, SSO

    2006-01-01

    An 8-week growth trial was conducted to determine the sensitivity of white sturgeon (Acipenser transmontanus) to the toxicological effects of elevated dietary selenium (Se). Juvenile white sturgeon were fed diets supplemented with Se in the form Of L-selenomethionine (SeMet), resulting in dietary concentrations of 0.4, 9.6, 20.5, 41.7, 89.8, and 191.1 mu g Se/g diet on a dry weight basis. Effects of dietary SeMet on survival, swimming activity, growth, whole-body proximate composition, tissue...

  9. Columbia River White Sturgeon (Acipenser Transmontanus) Early Life History and Genertics Study, August 1, 1984 to December 31, 1985 Final Report.

    Energy Technology Data Exchange (ETDEWEB)

    Brannon, Ernest L.

    1985-12-01

    Research on Columbia River white sturgeon has been directed at their early life history as it may apply to production and enhancement strategies for management of the species. The river environment in which sturgeon historically migrated, spawned, and reared has changed through development. Habitat changes are expected to precipitate genetic changes in the fish, as well as reduce the fitness in populations. Genetic analysis of samples taken from various locations over the length of the Columbia River have indicated that observed gene frequencies in all areas sampled were not in Hardy-Weinburg equilibrium, which could suggest that the general population is experiencing perturbation in the system. Analysis thus far has exposed few differences between samples from the lower, middle, and upper portions of the system. Allelic differences were identified in fish from the Roosevelt Lake, which may be evidence of unique characteristics among fish from that general area.

  10. Columbia River White Sturgeon (Acipenser Transmontanus) Population Genetics and Early Life History Study, January 1, 1986 to December 31, 1986, Final Report.

    Energy Technology Data Exchange (ETDEWEB)

    Brannon, Ernest L.

    1986-12-01

    The 1986 Columbia River white sturgeon investigations continued to assess genetic variability of sturgeon populations isolated in various areas of the Columbia River, and to examine environmental factors in the habitat that may affect early life history success. Baseline data have been collected for three character sets. Twenty-eight loci have been analyzed for differences using electrophoresis, snout shapes were assessed for multivariate distinction, and scute counts have been examined as an index of variability. Fish that reside in the mid-Columbia and lower river have been sufficiently characterized by electrophoresis to compare with up-river areas. To date, few electrophoretic differences have been identified. However, Lake Roosevelt sturgeon sample size will be increased to determine if some of the observed differences from lower river fish are significant. Snout shape has been shown to be easily quantifiable using the digitizing technique. Scute count data initially indicate that variability exists within as well as between areas. Patterns of differentiation of one or more of these data sets may be used to formulate stock transplant guidelines essential for proper management or enhancement of this species. The historical habitat available to sturgeon in the Columbia River has changed through the development of hydroelectric projects. Dams have reduced the velocity and turbulence, and increased light penetration in the water column from less silt. These changes have affected the ability of sturgeon to feed and have made them more vulnerable to predation, which appear to have altered the ability of populations isolated in the reservoirs to sustain themselves. Present studies support the theory that both the biological and physical habitat characteristics of the Columbia River are responsible for reduced sturgeon survival, and justify consideration of enhancement initiatives above Bonneville to improve sturgeon reproductive success.

  11. Vulnerability of young white sturgeon, Acipenser transmontanus, to predation in the presence of alternative prey

    Science.gov (United States)

    Gadomski, D.M.; Parsley, M.J.

    2005-01-01

    We conducted laboratory trials to test the vulnerability of young white sturgeon, Acipenser transmontanus, to predation when an alternative prey was available. In trials with two species of predators, we observed two feeding patterns. When equal numbers of white sturgeon and goldfish, Carassius auratus, were available, prickly sculpins, Cottus asper, ingested more white sturgeon. Conversely, northern pikeminnow, Ptychocheilus oregonensis, ate more juvenile coho salmon, Oncorhynchus kisutch, than white sturgeon in three out of four sets of trials, but ate more white sturgeon in one set of trials. White sturgeon size and the availability of cover did not affect the proportions of prey species ingested. Our results indicate that predation may be affecting survival of white sturgeon larvae and juveniles in the wild and could be one factor limiting recruitment of young-of-the-year white sturgeon in some locations. ?? Springer 2005.

  12. Comparison of fin ray sampling methods on white sturgeon Acipenser transmontanus growth and swimming performance.

    Science.gov (United States)

    Nguyen, P L; Jackson, Z J; Peterson, D L

    2016-02-01

    Effects of two fin-ray sampling methods on swimming performance, growth and survival were evaluated for hatchery-reared sub-adult white sturgeon Acipenser transmontanus. Fish were subjected to either a notch removal treatment in which a small section was removed from an anterior marginal pectoral-fin ray, or a full removal treatment in which an entire marginal pectoral-fin ray was removed. Control fish did not have fin rays removed, but they were subjected to a sham operation. A modified 3230 l Brett-type swim tunnel was used to evaluate 10 min critical station-holding speeds (SCSH ) of A. transmontanus, immediately after the fin ray biopsies were obtained with each method. Survival and growth were evaluated over a 6 month period for a separate group of fish subjected to the same biopsy methods. Mean ± S.E. 10 min SCSH were 108·0 ± 2·3, 110·0 ± 2·6 and 115·0 ± 3·5 cm s(-1) for the notch removal group, full removal group and control group, respectively, and were not significantly different among treatments. Behavioural characteristics including tail-beat frequency and time spent hunkering were also not significantly different among treatment groups swimming at the same speeds. There were no mortalities and relative growth was similar among treatment groups. Average biopsy time for the notch removal method was lower and the wounds appeared to heal more quickly compared with the full removal method.

  13. Identification and response to metals of metallothionein in two ancient fishes: white sturgeon (Acipenser transmontanus) and lake sturgeon (Acipenser fulvescens).

    Science.gov (United States)

    Doering, Jon A; Beitel, Shawn C; Eisner, Bryanna K; Heide, Timon; Hollert, Henner; Giesy, John P; Hecker, Markus; Wiseman, Steve B

    2015-05-01

    White sturgeon (Acipenser transmontanus) are among the most sensitive species of fishes to Cu, Cd, and Zn, but there is no information about sensitivity of lake sturgeon (Acipenser fulvescens). To begin to elucidate molecular mechanism(s) of sensitivity of sturgeons to metals a cDNA encoding metallothionein (MT) was amplified from livers of white sturgeon (WS-MT) and lake sturgeon (LS-MT), and expression in response to Cu, Cd, or Zn was characterized in liver explants from each species. The primary structure of WS-MT and LS-MT contained 20 cysteine residues, which is the same as MTs of teleost fishes. However, the primary structure of WS-MT and LS-MT contained 63 amino acids, which is longer than any MT identified in teleost fishes. Abundance of transcripts of WS-MT in explants exposed to 0.3, 3, 30, or 100 μg/L of Cu was 1.7-, 1.7-, 2.1-, and 2.6-fold less than in controls, respectively. In contrast, abundances of transcripts of WS-MT were 3.3- and 2.4-fold greater in explants exposed to 30 μg/L of Cd and 1000 μg/L of Zn, respectively. Abundance of transcripts of LS-MT was not significantly different at any concentration of Cu, Cd, or Zn. MT is hypothesized to represent a critical mechanism for detoxification of metals. Therefore, results of this study suggest that sensitivity of sturgeons to exposure to Cu, Cd, or Zn might be a result of the relatively lesser maximal response of MT to metals. The study also suggestslake sturgeon might be more sensitive than white sturgeon to metals.

  14. Status of White Sturgeon (Acipenser transmontanus Richardson, 1863) throughout the species range, threats to survival, and prognosis for the future

    Science.gov (United States)

    Hildebrand, L R; Drauch-Schreier, A; Lepla, K.; McAdam, S. O.; McLellan, J; Parsley, Michael J.; Paragamian, V L; Young, S P

    2017-01-01

    White Sturgeon, Acipenser transmontanus (WS), are distributed throughout three major river basins on the West Coast of North America: the Sacramento-San Joaquin, Columbia, and Fraser River drainages. Considered the largest North American freshwater fish, some WS use estuarine habitat and make limited marine movements between river basins. Some populations are listed by the United States or Canada as threatened or endangered (upper Columbia River above Grand Coulee Dam; Kootenai River; lower, middle and, upper Fraser River and Nechako River), while others do not warrant federal listing at this time (Sacramento-San Joaquin Rivers; Columbia River below Grand Coulee Dam; Snake River). Threats that impact WS throughout the species’ range include fishing effects and habitat alteration and degradation. Several populations suffer from recruitment limitations or collapse due to high early life mortality associated with these threats. Efforts to preserve WS populations include annual monitoring, harvest restrictions, habitat restoration, and conservation aquaculture. This paper provides a review of current knowledge on WS life history, ecology, physiology, behavior, and genetics and presents the status of WS in each drainage. Ongoing management and conservation efforts and additional research needs are identified to address present and future risks to the species.

  15. Quality attributes and microbial storage stability of caviar from cultivated white sturgeon (Acipenser transmontanus).

    Science.gov (United States)

    Shin, Joong-Han; Oliveira, Alexandra C M; Rasco, Barbara A

    2010-01-01

    Caviar was prepared from white sturgeon (Acipenser transmontanus) roe by adjusting the water phase salt (WPS) to 4.0% to 6.3% by adding food grade NaCl. Fish were obtained from 2 different farms from the Inland Northwest (N = 5). Salt was absorbed at a different rate and to a different extent by roe from different fish. The lipid content in the fish roe varied from 10.2% to 14.4% (w/w), with palmitic acid and oleic acid being the most abundant saturated and monounsaturated fatty acids present, respectively. The caviar contained high levels of polyunsaturated fatty acids (PUFA) (35% to 37%) with docosahexanoic acid being the most abundant omega-3 long chain fatty acid. There were no significant differences in microbial storage stability for caviars from different fish stored at 3 degrees C. However, for caviar stored at 7 degrees C, there was less growth of Listeria monocytogenes (using a cocktail of ATCC 19114, 7644, 19113 strains) in 2 samples (2B46 and 0F05) until day 20. In 2 other samples (453F and 2519), which had lower initial microbial loads, less overall microbial growth was observed, indicating that culture and harvest practices result in compositional differences between fish, which may impact both product composition and storage stability.

  16. Adverse health effects and histological changes in white sturgeon (Acipenser transmontanus) exposed to dietary selenomethionine.

    Science.gov (United States)

    Zee, Jenna; Patterson, Sarah; Gagnon, Danielle; Hecker, Markus

    2016-07-01

    It has been shown that selenium (Se) released to the aquatic environment can have devastating effects on local wildlife. White sturgeon (Acipenser transmontanus) have a life history particularly susceptible to contaminants, and their protection is of interest as they are culturally and economically important, and many populations are classified as endangered. During the present 72-d dietary study, multiple signs of decreased health and Se lethality were observed. Juvenile white sturgeon were given diets containing 1.4 μg, 5.6 μg, 22.4 μg, or 104.4 μg selenomethionine/g food (dry mass). Selenium accumulated in muscle and liver tissue in a dose-dependent manner. Edema causing exophthalmos developed within 15 d and 23 d, and lethal effects occurred in 54% and 22% of fish in the high- and medium-dose groups, respectively. Growth and hepatosomatic index were significantly lower in the high-dose group, which also had a high incidence of food avoidance. Histology of the liver revealed a dose-dependent increase in melanomacrophage aggregates and decrease of energy stores, which indicated toxicity. These results indicate that white sturgeon are susceptible to the effects of Se accumulation over relatively short time periods. This stresses the need for continued sturgeon research and studies looking into the environmental fate and regulation of released Se. Environ Toxicol Chem 2016;35:1741-1750. © 2015 SETAC.

  17. Fatty acid composition and volatile compounds of caviar from farmed white sturgeon (Acipenser transmontanus).

    Science.gov (United States)

    Caprino, Fabio; Moretti, Vittorio Maria; Bellagamba, Federica; Turchini, Giovanni Mario; Busetto, Maria Letizia; Giani, Ivan; Paleari, Maria Antonietta; Pazzaglia, Mario

    2008-06-09

    The present study was conducted to characterize caviar obtained from farmed white sturgeons (Acipenser transmontanus) subjected to different dietary treatments. Twenty caviar samples from fish fed two experimental diets containing different dietary lipid sources have been analysed for chemical composition, fatty acids and flavour volatile compounds. Fatty acid make up of caviar was only minimally influenced by dietary fatty acid composition. Irrespective of dietary treatments, palmitic acid (16:0) and oleic acid (OA, 18:1 n-9) were the most abundant fatty acid followed by docosahexaenoic acid (DHA, 22:6 n-3) and eicopentaenoic (EPA, 20:5 n-3). Thirty-three volatile compounds were isolated using simultaneous distillation-extraction (SDE) and identified by GC-MS. The largest group of volatiles were represented by aldehydes with 20 compounds, representing the 60% of the total volatiles. n-Alkanals, 2-alkenals and 2,4-alkadienals are largely the main responsible for a wide range of flavours in caviar from farmed white surgeon.

  18. Pericardial and pericardioperitoneal canal relationships to cardiac function in the white sturgeon (Acipenser transmontanus).

    Science.gov (United States)

    Gregory, Joshua A; Graham, Jeffrey B; Cech, Joseph J; Dalton, Nancy; Michaels, Jim; Chin Lai, N

    2004-06-01

    Sturgeons are primitive bony fishes and their hearts have structural features found in other primitive fishes. Sturgeons have a pericardioperitoneal canal (PPC), a one-way conduit into the peritoneum. A PPC also occurs in elasmobranchs (sharks and rays) and studies with that group demonstrate that pericardial pressure and pericardial fluid loss via the PPC affect stroke volume. A study of white sturgeon (Acipenser transmontanus) heart function was conducted to test for a comparable PPC and pericardial effects. White sturgeon-elasmobranch heart-function similarities include biphasic ventricular filling, a comparable operational pericardial pressure (-0.03 kPa), and a strongly negative pressure (-0.2 to -0.6 kPa) with complete pericardial fluid withdrawal. Differences include the white sturgeon's relatively smaller atrium and ventricle but a larger conus arteriosus. Although white sturgeon heart size is also smaller, its pericardial volume is disproportionately less (2.4 to 2.7 vs. 3.5 to 5.4 ml kg(-1) in elasmobranchs), meaning it has less scope for increasing stroke volume upon PPC fluid release. These differences may reflect the phylogenetic progression from the less complex operation of the elasmobranch heart, which lacks sympathetic innervation and has a mechanically mediated (PPC) stroke volume, to the condition in the more derived bony fishes which have sympathetic and parasympathetic regulation of both stroke volume and heart rate.

  19. Effects of incubation substrates on hatch timing and success of White Sturgeon (Acipenser transmontanus) embryos

    Science.gov (United States)

    Parsley, Michael J.; Kofoot, Eric

    2013-01-01

    The Kootenai River white sturgeon (Acipenser transmontanus) was listed as endangered under the Endangered Species Act in 1994 because several decades of failed spawning had put the population at risk of extinction. Natural spawning is known to occur at several locations in the Kootenai River, Idaho, but there is little natural recruitment. Microhabitat where embryo incubation occurs is known to be an important factor in white sturgeon reproductive success. This study was conducted to address questions regarding the suitability of different substrates as egg attachment and incubation sites for these fish. A comparative laboratory study using six types of incubation substrates—clean river rocks, periphyton- and algae-covered rocks, waterlogged wood, sand, riparian vegetation, and clean glass plates—tested the hypothesis that survival to hatch of white sturgeon eggs differs among incubation substrates. The results showed that sand was unsuitable as an incubation substrate, as the adhesive embryos were easily dislodged. Periphyton- and algae-covered rocks had the lowest hatch success, and all other substrates had similar hatch success.

  20. Bioaccumulation and chronic toxicity of dietary L-selenomethionine in juvenile white sturgeon (Acipenser transmontanus).

    Science.gov (United States)

    Tashjian, Diran H; Teh, Swee J; Sogomonyan, Arutyun; Hung, Silas S O

    2006-10-12

    An 8-week growth trial was conducted to determine the sensitivity of white sturgeon (Acipenser transmontanus) to the toxicological effects of elevated dietary selenium (Se). Juvenile white sturgeon were fed diets supplemented with Se in the form of L-selenomethionine (SeMet), resulting in dietary concentrations of 0.4, 9.6, 20.5, 41.7, 89.8, and 191.1 microg Se/g diet on a dry weight basis. Effects of dietary SeMet on survival, swimming activity, growth, whole-body proximate composition, tissue Se concentrations, and histopathology were determined. Sturgeon survival among treatment groups did not differ significantly with a mean survival rate of 99+/-0.43% across all groups. A significant decrease (psturgeon fed at or above 41.7 microg Se/g diet. Dietary SeMet concentrations were negatively correlated with whole-body protein and lipid content, but positively correlated with ash and moisture content. Selenium accumulated in the kidney, muscle, liver, gill, and plasma tissues in a dose-dependent manner. Histopathological alterations in the liver and kidney were observed in sturgeon fed above 20.5 microg Se/g diet. The threshold dietary Se toxicity concentration for white sturgeon was estimated to lie between 10 and 20 microg Se/g diet based on the histopathological alterations in the kidney. Research examining the consequences of elevated dietary Se concentrations on more sensitive life stages and the interactive effects of Se with other chemical or physical stressors are needed in order to determine if dietary threshold should be lowered to minimize the potential impacts of Se on white sturgeon in the San Francisco Bay-Delta.

  1. Transmission of white sturgeon iridovirus in Kootenai River white sturgeon Acipenser transmontanus.

    Science.gov (United States)

    Drennan, John D; LaPatra, Scott E; Siple, Jack T; Ireland, Sue; Cain, Kenneth D

    2006-06-12

    It is thought that white sturgeon iridovirus (WSIV) is transmitted vertically from adult white sturgeon Acipenser transmontanus to progeny, and that wild adults are carriers of this virus. Based on this assumption, egg disinfection trials were initiated using wild Kootenai River white sturgeon. Over 2 consecutive years, post-fertilized eggs were disinfected with iodine at concentrations ranging from 0 to 400 ppm. Eggs were incubated and progeny were reared on either de-chlorinated municipal or Kootenai River water. Juvenile sturgeon (mean weight 3.0 g) from these treatment groups were then subjected to a density stress (15 or 20 g(-1)) to manifest WSIV disease in individuals harboring the virus. In Year 1, mortality in all groups ranged from 6 to 37% and the use of municipal water was shown to significantly improve survival. However, WSIV infection was not detected in fish from any of the treatment groups or controls, and therefore did not contribute to the observed mortality. In Year 2, all treatment and control groups reared on Kootenai River water tested positive for WSIV infection and exhibited mortality ranging from 59 to 94%, but fish from groups reared on municipal water did not test positive for WSIV infection. This shows that that vertical transmission did not occur in this study. Horizontal transmission played a significant role in WSIV infection, but the lack of infection in Year 1 suggests a cyclic occurrence of the virus in the Kootenai River system. Although survival tended to be better in iodine-treated groups, the effects of iodine treatment in relation to WSIV transmission remain unknown. An important finding is that not all wild white sturgeon broodstock yield WSIV-positive progeny.

  2. White sturgeon (Acipenser transmontanus) acid-base regulation differs in response to different types of acidoses.

    Science.gov (United States)

    Shartau, Ryan B; Baker, Dan W; Brauner, Colin J

    2017-03-11

    White sturgeon (Acipenser transmontanus) completely protect intracellular tissue pH (pHi) despite large reductions in extracellular (blood) pH (pHe), termed preferential pHi regulation, in response to elevated environmental PCO2 (hypercarbia) and in general appear to be relatively resilient to stressors. Preferential pHi regulation is thought to be associated with hypercarbia tolerance in general, but has also recently been observed to protect pHi against metabolic acidoses induced by exhaustive exercise and anoxia in a tropical air breathing catfish. We hypothesized that preferential pHi regulation may also be a general strategy of acid-base regulation in sturgeon. To address this hypothesis, severe acidoses were imposed to reduce pHe, and the presence or absence of preferential pHi regulation was assessed in red blood cells (RBC), heart, brain, liver and white muscle. A respiratory acidosis was imposed using hyperoxia, while metabolic acidoses were induced by exhaustive exercise, anoxia or air exposure. Reductions in pHe occurred following hyperoxia (0.15 units), exhaustive exercise (0.30 units), anoxia (0.10 units) and air exposure (0.35 units); all acidoses reduced RBC pHi. Following hyperoxia, heart, brain and liver pHi were preferentially regulated against the reduction in pHe, similar to hypercarbia exposure. Following all metabolic acidoses heart pHi was protected and brain pHi remained unchanged following exhaustive exercise and air exposure, however, brain pHi was reduced following anoxia. Liver and white muscle pHi were reduced following all metabolic acidoses. These results suggest preferential pHi regulation may be a general strategy during respiratory acidoses but during metabolic acidoses, the response differs between source of acidoses and tissues.

  3. White sturgeon (Acipenser transmontanus) passage at the Dalles Dam, Columbia River, USA

    Science.gov (United States)

    Parsley, M.J.; Wright, C.D.; Van Der Leeuw, B. K.; Kofoot, E.E.; Peery, C.A.; Moser, M.L.

    2007-01-01

    White sturgeon (Acipenser transmontanus) ???95 cm TL were monitored using acoustic and radio telemetry at a large hydroelectric dam (the Dalles Dam) on the Columbia River, during March 2004 through November 2005 to determine timing and routes of passage and to characterize general movements. Transmitters were surgically implanted into 148 fish during the study; 90 were released into the tailrace and 58 into the forebay. We documented 26 passage events by 19 tagged fish: eight upstream via fish ladders and 18 downstream, mostly through open spill gates. During the study 17 fish entered the two ladders one or more times; 11 entered only the east ladder, three entered only the north ladder, and three entered both ladders at sometime. Residence time within the ladders by individual fish was variable, ranging from about 1 min to nearly 6 months (median = 7.7 h). Only six fish successfully ascended the east ladder, one fish twice. We could not unequivocally determine which fish ladder one fish used to pass upstream. Differences in construction between the north and east fish ladders may account for the greater success of the east fish ladder in passing sturgeon upstream. Changes to operations at hydroelectric dams to benefit migrating anadromous salmonids may influence upstream or downstream passage by white sturgeon. Altering patterns and timing of spill discharge, altering fish ladder entrance attraction flows, and the use of lights, sound, and partial barriers to direct other species of fish to preferred passage routes have unknown effects on sturgeon passage. A better understanding of the consequences to the metapopulation of increasing or precluding upstream or downstream passage is needed. ?? 2007 The Authors.

  4. Is hepatic oxidative stress a main driver of dietary selenium toxicity in white sturgeon (Acipenser transmontanus)?

    Science.gov (United States)

    Zee, Jenna; Patterson, Sarah; Wiseman, Steve; Hecker, Markus

    2016-11-01

    Most species of sturgeon have experienced significant population declines and poor recruitment over the past decades, leading many, including white sturgeon (Acipenser transmontanus), to be listed as endangered. Reasons for these declines are not yet fully understood but benthic lifestyle, longevity, and delayed sexual maturation likely render sturgeon particularly susceptible to factors such as habitat alteration and contaminant exposures. One contaminant of particular concern to white sturgeon is selenium (Se), especially in its more bioavailable form selenomethionine (SeMet), as it is known to efficiently bioaccumulate in prey items of this species. Studies have shown white sturgeon to be among the most sensitive species of fish to dietary SeMet as well as other pollutants such as metals, dioxin-like chemicals and endocrine disrupters. One of the primary hypothesized mechanisms of toxicity of SeMet in fish is oxidative stress; however, little is know about the specific mode by which SeMet affects the health of white sturgeon. Therefore, the aim of this study was to characterize oxidative stress and associated antioxidant responses as a molecular event of toxicity, and to link it with the pathological effects observed previously. Specifically, three-year-old white sturgeon were exposed for 72 days via their diet to 1.4, 5.6, 22.4 or 104.4µg Se per g feed (dm). Doses were chosen to range over a necessary Se intake level, current environmentally relevant intakes and an intake representing predicted increases of Se release. Lipid hydroperoxides, which are end products of lipid oxidation, were quantified as a marker of oxidative stress. Changes in gene expression of glutathione peroxidase (GPx), superoxide dismutase, catalase, glutathione S-transferase, apoptosis inducing factor and caspase 3 were quantified as markers of the response to oxidative stress. Concentrations of lipid hydroperoxides were highly variable within dose groups and no dose response was observed

  5. Linking Oxidative Stress and Magnitude of Compensatory Responses with Life-Stage Specific Differences in Sensitivity of White Sturgeon (Acipenser transmontanus) to Copper or Cadmium.

    Science.gov (United States)

    Tang, Song; Doering, Jon A; Sun, Jianxian; Beitel, Shawn C; Shekh, Kamran; Patterson, Sarah; Crawford, Sarah; Giesy, John P; Wiseman, Steve B; Hecker, Markus

    2016-09-06

    Sensitivity of white sturgeon (Acipenser transmontanus) to copper (Cu) or cadmium (Cd) has been shown to significantly differ as a function of life-stage. This study investigated oxidative stress, metal homeostasis, and associated compensatory responses as potential mechanisms of this sensitivity pattern in three early life-stages. Sturgeon were most sensitive to Cu at 15 days post hatch (dph), which was accompanied by a significant increase in lipid peroxidation (LPO). Genes involved with amelioration of oxidative stress were significantly less inducible at this stage than in older, less sensitive fry. At 48 dph, acute lethality of sturgeon exposed to Cd was greatest and body LPO was significantly induced by 3.5-fold at 5 μg Cd/L. Moreover, there was a small but significant increase in antioxidative responses. At 139 dph, sturgeon were most tolerant to Cu and Cd and accumulation of these metals was least. Also, expression of metallothionein (MT) and apoptotic genes were greatest while expression of metal transporters was reduced and concentration of LPO was not different from controls. Our results suggest that life-stage specific sensitivity of white sturgeon to metals is complex, encompassing differences in the ability to mount compensatory responses important for metal homeostasis and combating oxidative stress and concomitant damages.

  6. Monitoring the effects of storage in caviar from farmed Acipenser transmontanus using chemical, SEM, and NMR methods.

    Science.gov (United States)

    Gussoni, Maristella; Greco, Fulvia; Vezzoli, Alessandra; Paleari, Maria Antonietta; Moretti, Vittorio Maria; Beretta, Giuseppe; Caprino, Fabio; Lanza, Barbara; Zetta, Lucia

    2006-09-06

    The effects of storage at 4 degrees C on the quantity and quality of chemical components in the caviar from farmed Acipenser transmontanus have been analyzed by SEM, chemical methods, and NMR and MRI techniques. Particular attention has been focused on the lipid components, the distribution and mobility of which were strongly affected by the storage time. MRI and relaxation data indicated that lipids are endowed with two different mobility regimes, one slow (short T1) and one fast (long T1), both lengthening with the storage time. Chemical analysis assessed a total fat content that remained practically unchanged and a constant fatty acid composition during the total storage time. The combination of the two methods allowed one (a) to suppose that a mechanism of lipid hydrolysis (faster in unsalted than in salted eggs) is still occurring during storage of caviar at 4 degrees C for up to approximately 4 months and (b) to exclude that an intensive oxidative process is active in the same storage period.

  7. Toxicokinetics and biotransformation of p-nitrophenol in white sturgeon (Acipenser transmontanus).

    Science.gov (United States)

    TenBrook, P L; Kendall, S M; Tjeerdema, R S

    2006-07-01

    White sturgeon (Acipencer transmontanus) were exposed to 7.2 microM (1.0 ppm) 14C-labeled p-nitrophenol (PNP) in brackish water for 24 h and then allowed to depurate in clean brackish water for another 24h. Absorption, conditional uptake clearance, and conditional elimination rate constants were 0.08+/-0.04 h(-1), 8.1+/-3.6 mL g(-1) h(-1), and 0.46+/-0.21 h(-1), respectively. A whole-organism total concentration factor of 18.7+/-2.6 was determined from equilibrium tissue and water concentrations. Sturgeon depurated 89.4% of absorbed PNP within 24h, of which 53.0+/-8.3% was unmetabolized parent compound, 9.6+/-3.6% was p-nitrophenyl-beta-d-glucuronide, and 39.1+/-8.3% was p-nitrophenylsulfate.

  8. Ontogenetic behavior and dispersal of Sacramento River white sturgeon, Acipenser transmontanus, with a note on body color

    Science.gov (United States)

    Kynard, B.; Parker, E.

    2005-01-01

    We studied Sacramento River white sturgeon, Acipenser transmontanus, in the laboratory to develop a conceptual model of ontogenetic behavior and provide insight into probable behavior of wild sturgeon. After hatching, free embryos initiated a low intensity, brief downstream dispersal during which fish swam near the bottom and were photonegative. The weak, short dispersal style and behavior of white sturgeon free embryos contrasts greatly with the intense, long dispersal style and behavior (photopositive and swimming far above the bottom) of dispersing free embryos of other sturgeon species. If spawned eggs are concentrated within a few kilometers downstream of a spawning site, the adaptive significance of the free embryo dispersal is likely to move fish away from the egg deposition site to avoid predation and reduce fish density prior to feeding. Larvae foraged on the open bottom, swam white sturgeon populations may be a mis-match between the innate fish dispersal and post-dispersal rearing habitat, which is now highly altered by damming and reservoirs. Sacramento River white sturgeon has a two-step downstream dispersal by the free embryo and juvenile life intervals. Diel activity of all life intervals peaked at night, whether fish were dispersing or foraging. Nocturnal behavior is likely a response to predation, which occurs during both activities. An intense black-tail body color was present on foraging larvae, but was weak or absent on the two life intervals that disperse. Black-tail color may be an adaptation for avoiding predation, signaling among aggregated larvae, or both, but not for dispersal. ?? Springer 2005.

  9. Physiological stress response, reflex impairment and delayed mortality of white sturgeon Acipenser transmontanus exposed to simulated fisheries stressors

    Science.gov (United States)

    McLean, Montana F.; Hanson, Kyle C.; Cooke, Steven J.; Hinch, Scott G.; Patterson, David A.; Nettles, Taylor L.; Litvak, Matt K.; Crossin, Glenn T.

    2016-01-01

    White sturgeon (Acipenser transmontanus) are the largest freshwater fish in North America and a species exposed to widespread fishing pressure. Despite the growing interest in recreational fishing for white sturgeon, little is known about the sublethal and lethal impacts of angling on released sturgeon. In summer (July 2014, mean water temperature 15.3°C) and winter (February 2015, mean water temperature 6.6°C), captive white sturgeon (n = 48) were exposed to a combination of exercise and air exposure as a method of simulating an angling event. After the stressor, sturgeon were assessed for a physiological stress response, and reflex impairments were quantified to determine overall fish vitality (i.e. capacity for survival). A physiological stress response occurred in all sturgeon exposed to a fishing-related stressor, with the magnitude of the response correlated with the duration of the stressor. Moreover, the stress from exercise was more pronounced in summer, leading to higher reflex impairment scores (mean ± SEM, 0.44 ± 0.07 and 0.25 ± 0.05 in summer and winter, respectively). Reflex impairment was also correlated with lactate concentrations (e.g. physiological stress measures related to exhaustive exercise; r = 0.53) and recovery time (r = 0.76). Two mortalities occurred >24 h after the cessation of treatment in the summer. Given that natural habitats for white sturgeon can reach much higher temperatures than those presented in our study, we caution the use of this mortality estimate for a summer season, because latent mortality could be much higher when temperatures exceed 16°C. This is the first experiment investigating the physiological disturbance and reflex impairment of capture and release at two temperatures on subadult/adult white sturgeon, and the results suggest that future research needs to examine the longer term and fitness consequences of extended play and air exposure times, because these are largely unknown for wild populations

  10. Maintaining tissue selenium species distribution as a potential defense mechanism against methylmercury toxicity in juvenile white sturgeon (Acipenser transmontanus).

    Science.gov (United States)

    Huang, Susie Shih-Yin; Hung, Silas S O; Chan, Hing Man

    2014-11-01

    Selenium (Se) has been shown to antagonize mercury (Hg) toxicity. We have previously demonstrated that orally intubated selenomethionine (SeMet) and methylmercury (MeHg) reduced tissue Se accumulation, as well as blood and kidney Hg concentrations in juvenile white sturgeon (Acipenser transmontanus). However, the form of Se accumulated is not known. In this study, three organoseleniums: selenocysteine (Sec), Se-methyl-selenocysteine (MSeCys), and SeMet and two inorganic Se species: selenate and selenite were determined and quantified in the blood at different post-intubation periods (12, 24, 48h) and in the muscle, liver, and kidneys at 48h in white sturgeon orally intubated with a single dose of control (carrier), SeMet (500μg Se/kg body weight; BW), MeHg (850μg Hg/kg BW), and both (Se+Hg; at 500μg Se/kg and 850μg Hg/kg BW). When only SeMet was intubated, the accumulative/unmodified pathway took precedent in the blood, white muscle, liver, and kidneys. In the presence of MeHg, however, active metabolic transformation and de novo synthesis of biologically active Se forms are seen in the liver and kidneys, as indicated by a gradual increase in blood Sec:SeMet ratios and Se metabolites. In the white muscle, mobilization of endogenous Se storage by MeHg is supported by the absence of tissue SeMet and detectable levels of blood SeMet. In contrast, co-intubation with SeMet increased muscle SeMet. The high levels of unknown Se metabolites and detectable levels of selenite in the kidney reflect its role as the major excretory organ for Se. Selenium metabolism is highly regulated in the kidneys, as Se speciation was not affected by MeHg or by its co-intubation with SeMet. In the Se+Hg group, the proportion of SeMet in the liver has decreased to nearly 1/8th of that of the SeMet only group, resulting in a more similar selenocompound distribution profile to that of the MeHg only group. This is likely due to the increased need for Se metabolites necessary for Me

  11. Physiological stress response, reflex impairment and delayed mortality of white sturgeon Acipenser transmontanus exposed to simulated fisheries stressors.

    Science.gov (United States)

    McLean, Montana F; Hanson, Kyle C; Cooke, Steven J; Hinch, Scott G; Patterson, David A; Nettles, Taylor L; Litvak, Matt K; Crossin, Glenn T

    2016-01-01

    White sturgeon (Acipenser transmontanus) are the largest freshwater fish in North America and a species exposed to widespread fishing pressure. Despite the growing interest in recreational fishing for white sturgeon, little is known about the sublethal and lethal impacts of angling on released sturgeon. In summer (July 2014, mean water temperature 15.3°C) and winter (February 2015, mean water temperature 6.6°C), captive white sturgeon (n = 48) were exposed to a combination of exercise and air exposure as a method of simulating an angling event. After the stressor, sturgeon were assessed for a physiological stress response, and reflex impairments were quantified to determine overall fish vitality (i.e. capacity for survival). A physiological stress response occurred in all sturgeon exposed to a fishing-related stressor, with the magnitude of the response correlated with the duration of the stressor. Moreover, the stress from exercise was more pronounced in summer, leading to higher reflex impairment scores (mean ± SEM, 0.44 ± 0.07 and 0.25 ± 0.05 in summer and winter, respectively). Reflex impairment was also correlated with lactate concentrations (e.g. physiological stress measures related to exhaustive exercise; r = 0.53) and recovery time (r = 0.76). Two mortalities occurred >24 h after the cessation of treatment in the summer. Given that natural habitats for white sturgeon can reach much higher temperatures than those presented in our study, we caution the use of this mortality estimate for a summer season, because latent mortality could be much higher when temperatures exceed 16°C. This is the first experiment investigating the physiological disturbance and reflex impairment of capture and release at two temperatures on subadult/adult white sturgeon, and the results suggest that future research needs to examine the longer term and fitness consequences of extended play and air exposure times, because these are largely unknown for wild populations.

  12. Columbia River White Sturgeon (Acipenser Transmontanus) Enhancement, May 1-December 31, 1983 Final Report.

    Energy Technology Data Exchange (ETDEWEB)

    Brannon, E.L.

    1984-12-01

    Studies were undertaken to examine and define the early life history characteristics of Columbia River white sturgeon as a working base from which enhancement measures could be developed. Adult sturgeon were captured and held for spawning at Covert's Landing, the site of the hatchery facilities below Bonneville Dam. Pituitary hormones stimulated ovulation; ripe females were live spawned surgically and the eggs incubated in hatching jars. Larvae were either reared at the hatchery site after incubation to advanced fingerling stages or transferred to the University laboratory for more detailed study. Displacement downstream occurs as a means of distribution and can last several days before a strong substrate preference is manifested. Once bottom contact is sought by the larvae, displacement is abated, and a general preference for sandy surface appears to predominate. Since potentially extensive displacement downstream could result in the distribution of larvae in saltwater, the tolerance of young sturgeon to saltwater was examined. The responsiveness of young sturgeon to artificial feed was positive. With these results, the original concern for identifying an adequate diet and food source that would be readily accepted by fry was greatly attenuated. The readiness of young fry to initiate feeding on the artificial diet made further study on feeding stimulants unnecessary. Examination of the feeding response suggested that as long as the diet used in the present study was initiated at the proper time and with adequate frequency, the fry would feed quite well and survive. 6 refs., 10 figs., 5 tabs.

  13. Acute and chronic sensitivity of white sturgeon (Acipenser transmontanus) and rainbow trout (Oncorhynchus mykiss) to cadmium, copper, lead, or zinc in laboratory water-only exposures

    Science.gov (United States)

    Ingersoll, Christopher G.; Contributions by Wang, Ning; Calfee, Robin D.; Beahan, Erinn; Brumbaugh, William G.; Dorman, Rebecca A.; Hardesty, Doug K.; Kunz, James L.; Little, Edward E.; Mebane, Christopher A.; Puglis, Holly J.

    2014-01-01

    White sturgeon (Acipenser transmontanus) are experiencing poor recruitment in the trans boundary reach of the upper Columbia River in eastern Washington State. Limited toxicity data indicated that early life stages of white sturgeon are sensitive to metals. In acute 4-day (d) exposures with larval white sturgeon, previous studies have reported that the 4-day median lethal concentrations (LC50) based on biotic ligand model (BLM) normalization for copper were below the U.S. Environmental Protection Agency national recommended acute water-quality criterion. In previously published chronic 66-d exposures starting with newly fertilized eggs of white sturgeon, 20-percent lethal effect concentrations (LC20s) for copper, cadmium, or zinc generally were within a factor of two of the chronic values of the most sensitive fish species in the databases of the U.S. Environmental Protection Agency water-quality criteria (WQC) for the three metals. However, there were some uncertainties in the chronic exposures previously performed with white sturgeon, including (1) low control survival (37 percent), (2) more control fish tested in each replicate compared to other treatments, (3) limited replication of treatments (n=2), (4) lack of reported growth data (such as dry weight), and (5) wide dilution factors for exposure concentrations (6- to 8-fold dilutions). The U.S. Environmental Protection Agency concluded that additional studies are needed to generate more toxicity data to better define lethal and sublethal toxicity thresholds for metals for white sturgeon. The objective of the study was to further evaluate the acute and chronic toxicity of cadmium, copper, lead, or zinc to early life stages of white sturgeon in water-only exposures. Toxicity tests also were performed with commonly tested rainbow trout (Oncorhynchus mykiss) under similar test conditions to determine the relative sensitivity between white sturgeon and rainbow trout to these metals. Toxicity data generated from

  14. Simultaneous extraction and cleanup of high-lipid organs from white sturgeon (Acipenser transmontanus) for multiple legacy and emerging organic contaminants using QuEChERS sample preparation.

    Science.gov (United States)

    Morrison, Shane A; Sieve, Kristal K; Ratajczak, Robert E; Bringolf, Robert B; Belden, Jason B

    2016-01-01

    The objective of this research was to utilize the QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) method to extract a broad range of persistent organic pollutants from sturgeon organs (liver and gonad) as indicators of exposure. The analyte list was prioritized to include carcinogenic polyaromatic hydrocarbons (PAHs), the most commonly occurring polybrominated diphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs), persistent bioaccumulative and toxic chemicals (PBTs), and emergent contaminants of concern (ECCs) as indicators of human sewage exposure. White sturgeon (Acipenser transmontanus) were selected for this study to support a larger ecotoxicological study to monitor contaminants as an assessment of fish health. Organ tissues contained high lipid content with percentages of 15% and 34% for liver and gonad, respectively. Overall recoveries from fortified sturgeon tissues were high, 71-98% for PAHs, 60-107% for PBDEs and PCBs, 86-107% for PBT chemicals, and 88-107% for ECCs with the exception of octinoxate (28%) from liver tissues. Analyte recovery trends decreased as analyte lipophilicity and molecular weight increased. These recoveries demonstrate that extraction using QuEChERS can be used for screening of the most common bioaccumulating organic compounds in high lipid fish tissue using a single extraction and analysis.

  15. Effects of feeding on thermoregulatory behaviours and gut blood flow in white sturgeon (Acipenser transmontanus) using biotelemetry in combination with standard techniques.

    Science.gov (United States)

    Gräns, A; Olsson, C; Pitsillides, K; Nelson, H E; Cech, J J; Axelsson, M

    2010-09-15

    The effects of thermoregulatory behaviours on gut blood flow in white sturgeon Acipenser transmontanus before and after feeding was studied using a blood flow biotelemetry system in combination with a temperature preference chamber. This is the first study to look at cardiovascular responses to feeding in white sturgeon, and also the first time behavioural tests in fish have been combined with recordings of cardiac output, heart rate, cardiac stroke volume and gut blood flow. The results showed strong correlations between gut blood flow and temperature choice after feeding (R(2)=0.88+/-0.03, 6-8 h postprandially and R(2)=0.89+/-0.04, 8-10 h postprandially) but not prior to feeding (R(2)=0.11+/-0.05). Feeding did not affect the actual temperature preference (18.4+/-0.7 degrees C before feeding, 18.1+/-0.7 degrees C, 6-8 h postprandially and 17.5+/-0.5 degrees C, 8-10 h postprandially). Fish instrumented with a blood flow biotelemetry device, and allowed to move freely in the water, had a significantly lower resting heart rate (37.3+/-0.26 beats min(-1)) compared with the control group that was traditionally instrumented with transit-time blood flow probes and kept in a confined area in accordance with the standard procedure (43.2+/-2.1 beats min(-1)). This study shows, for the first time in fish, the correlation between body temperature and gut blood flow during behavioural thermoregulation.

  16. Steroidogenic acute regulatory protein in white sturgeon (Acipenser transmontanus): cDNA cloning, sites of expression and transcript abundance in corticosteroidogenic tissue after an acute stressor.

    Science.gov (United States)

    Kusakabe, Makoto; Zuccarelli, Micah D; Nakamura, Ikumi; Young, Graham

    2009-06-01

    The white sturgeon, Acipenser transmontanus, is a primitive bony fish that is recognized as an important emerging species for aquaculture. However, many aspects of its stress and reproductive physiology remain unclear. These processes are controlled by various steroid hormones. In order to investigate the regulation of steroidogenesis associated with acute stress in sturgeon, a cDNA-encoding steroidogenic acute regulatory protein (StAR) was isolated from white sturgeon. The putative amino acid sequence of sturgeon StAR shares high homology (over 60%) with other vertebrates. Phylogenetic analysis grouped sturgeon StAR within Actinopterygii, but it was clearly segregated from teleost StARs. RT-PCR analysis revealed that transcripts were most abundant in yellow corpuscles found throughout the kidney and weaker signals were detected in gonad and kidney. Very weak signals were also detected in brain and spleen by quantitative real-time PCR. In situ hybridization revealed that StAR is expressed in the cells of yellow corpuscles. No significant changes in StAR gene expression were detected in response to an acute handling stress. These results suggest that StAR is highly conserved throughout vertebrates, but the expression of the functional protein during the stress response may be partially regulated post-transcriptionally.

  17. Ancient fish and recent invaders: white sturgeon Acipenser transmontanus diet response to invasive-species-mediated changes in a benthic prey assemblage

    Science.gov (United States)

    Zeug, Steven C; Brodsky, Annie; Kogut, Nina; Stewart, Robin; Merz, Joe

    2014-01-01

    Invasive organisms can have significant impacts on native species, and the San Francisco Estuary (SFE), California, USA, is one of the world's most invaded estuaries. Decline of native white sturgeon Acipenser transmontanus abundance in the SFE has been acknowledged, but underlying mechanisms are poorly understood. Invasion by the overbite clam Potamocorbula amurensis has drastically altered the SFE benthic prey community, yet little is known about how this change has affected sturgeon diets. We investigated changes in the diet of white sturgeon following the overbite clam invasion and subsequent shift in the SFE benthic prey assemblage. Gut content analysis was used to compare white sturgeon prey composition and importance between the pre- and post-invasion periods. Additionally, stable isotope analysis was employed to estimate the assimilation of prey items to sturgeon biomass. Overbite clams dominated diets in the post-invasion period, accounting for 82 to 93% of total volume. Stable isotope analysis confirmed the importance of this prey item, although their assimilated contribution to sturgeon biomass was estimated to be less (70 to 83%) than gut contents indicated. The frequency of fish in white sturgeon guts increased in the post-invasion period, and isotope analysis indicated relatively large contributions of fish to sturgeon biomass (3.7 to 19%). The trophic adaptability of white sturgeon has allowed them to exploit this new prey source (overbite clam). Future conservation and restoration efforts must consider a potentially destabilized food web given the large importance of a single prey item.

  18. Characterization of the contents and histology of the gastrointestinal tracts of White Sturgeon (Acipenser transmontanus) captured from Upper Lake Roosevelt, Washington, October 2008

    Science.gov (United States)

    Parsley, Michael J.; van der Leeuw, Bjorn K.; Elliott, Diane G.

    2010-01-01

    The gastrointestinal tracts of 37 juvenile white sturgeon (Acipenser transmontanus) captured from the upper part of Lake Roosevelt during October 2008, were examined to identify prey taxa and to determine if the fish were consuming smelter slag along with other sediments. Histological examination of the gastrointestinal tract tissues and comparison with similar tissues from hatchery-reared fish also was performed. The contents of the gastro-intestinal tracts (guts) indicated that white sturgeon were actively foraging on various benthic invertebrates and the diet was quite diverse, with more than 50 percent of the fish feeding on five or more different taxa. Slag was present in 76 percent of the guts examined. Although not all guts contained slag particles, larger fish tended to have greater amounts of slag in their guts. Histology of the gut tissues showed the presence of a chronic inflammatory response, and the severity of the response had a significant positive correlation (P = 0.01) with fish length and weight suggesting that the inflammation represented a response to long-term exposure to one or more stressors. However, additional work is needed to determine if the physical or chemical properties of slag contributed to this response.

  19. Chronic sensitivity of white sturgeon (Acipenser transmontanus) and rainbow trout (Oncorhynchus mykiss) to cadmium, copper, lead, or zinc in laboratory water-only exposures

    Science.gov (United States)

    Wang, Ning; Ingersoll, Christopher G.; Dorman, Rebecca A.; Brumbaugh, William G.; Mebane, Christopher A.; Kunz, James L.; Hardesty, Douglas K.

    2014-01-01

    Chronic toxicity of cadmium, copper, lead, or zinc to white sturgeon (Acipenser transmontanus) and rainbow trout (Oncorhynchus mykiss) was evaluated in water-only exposures started with newly hatched larvae or approximately 1-mo-old juveniles. The 20% effect concentration (EC20) for cadmium from the sturgeon tests was higher than the EC20 from the trout tests, whereas the EC20 for copper, lead, or zinc for the sturgeon were lower than those EC20s for the trout. When the EC20s from the present study were included in compiled toxicity databases for all freshwater species, species mean chronic value for white sturgeon was in a relatively low percentile of the species sensitivity distribution for copper (9th percentile) and in the middle percentile for cadmium (55th percentile), zinc (40th percentile), or lead (50th percentile). However, the species mean chronic value for rainbow trout was in a high percentile for copper, lead, and zinc (∼68th–82nd percentile), but in a low percentile for cadmium (23rd percentile). The trout EC20s for each of the 4 metals and the sturgeon EC20s for cadmium or lead were above US Environmental Protection Agency chronic ambient water quality criteria (AWQC) or Washington State chronic water quality standards (WQS), whereas the sturgeon EC20s for copper or zinc were approximately equal to or below the chronic AWQC and WQS. In addition, acute 50% effect concentrations (EC50s) for copper obtained in the first 4 d of the chronic sturgeon test were below the final acute value used to derive acute AWQC and below acute WQS for copper.

  20. Chronic sensitivity of white sturgeon (Acipenser transmontanus) and rainbow trout (Oncorhynchus mykiss) to cadmium, copper, lead, or zinc in laboratory water-only exposures.

    Science.gov (United States)

    Wang, Ning; Ingersoll, Christopher G; Dorman, Rebecca A; Brumbaugh, William G; Mebane, Christopher A; Kunz, James L; Hardesty, Doug K

    2014-10-01

    Chronic toxicity of cadmium, copper, lead, or zinc to white sturgeon (Acipenser transmontanus) and rainbow trout (Oncorhynchus mykiss) was evaluated in water-only exposures started with newly hatched larvae or approximately 1-mo-old juveniles. The 20% effect concentration (EC20) for cadmium from the sturgeon tests was higher than the EC20 from the trout tests, whereas the EC20 for copper, lead, or zinc for the sturgeon were lower than those EC20s for the trout. When the EC20s from the present study were included in compiled toxicity databases for all freshwater species, species mean chronic value for white sturgeon was in a relatively low percentile of the species sensitivity distribution for copper (9th percentile) and in the middle percentile for cadmium (55th percentile), zinc (40th percentile), or lead (50th percentile). However, the species mean chronic value for rainbow trout was in a high percentile for copper, lead, and zinc (∼68th-82nd percentile), but in a low percentile for cadmium (23rd percentile). The trout EC20s for each of the 4 metals and the sturgeon EC20s for cadmium or lead were above US Environmental Protection Agency chronic ambient water quality criteria (AWQC) or Washington State chronic water quality standards (WQS), whereas the sturgeon EC20s for copper or zinc were approximately equal to or below the chronic AWQC and WQS. In addition, acute 50% effect concentrations (EC50s) for copper obtained in the first 4 d of the chronic sturgeon test were below the final acute value used to derive acute AWQC and below acute WQS for copper.

  1. Characterization of Na(+) transport to gain insight into the mechanism of acid-base and ion regulation in white sturgeon (Acipenser transmontanus).

    Science.gov (United States)

    Shartau, Ryan B; Brix, Kevin V; Brauner, Colin J

    2017-02-01

    Freshwater fish actively take up ions via specific transporters to counter diffusive losses to their hypotonic environment. While much is known about the specific mechanisms employed by teleosts, almost nothing is known about the basal fishes, such as white sturgeon (Acipenser transmontanus) which may offer insight into the evolution of osmo- and ionoregulation in fishes. We investigated Na(+) uptake in juvenile white sturgeon in the presence and absence of transporter inhibitors. We found that sturgeon acclimated to 100μmoll(-1) Na(+) have Na(+) uptake kinetics typical of teleosts and that a Na(+)/H(+) exchanger (NHE) is the predominant transporter for Na(+) uptake. White sturgeon are tolerant to hypercarbia-induced respiratory acidoses and recover blood pH (pHe) at 1.5kPa PCO2 but not at higher PCO2 (6kPa PCO2) where they preferentially regulate intracellular pH (pHi). It was hypothesized that during exposure to hypercarbia Na(+) uptake would increase at CO2 tensions at which fish were capable of pHe regulation but decrease at higher tensions when they were preferentially regulating pHi. We found that Na(+) uptake did not increase at 1.5kPa PCO2, but at 6kPa PCO2 Na(+) uptake was reduced by 95% while low water pH equivalent to 6kPa PCO2 reduced Na(+) uptake by 71%. Lastly, we measured net acid flux during hypercarbia, which indicates that net acid flux is not associated with Na(+) uptake. These findings indicate Na(+) uptake in sturgeon is not different from freshwater teleosts but is sensitive to hypercarbia and is not associated with pHe compensation during hypercarbia.

  2. Complete intracellular pH protection during extracellular pH depression is associated with hypercarbia tolerance in white sturgeon, Acipenser transmontanus.

    Science.gov (United States)

    Baker, D W; Matey, V; Huynh, K T; Wilson, J M; Morgan, J D; Brauner, C J

    2009-06-01

    Sturgeons are among the most CO2 tolerant of fishes investigated to date. However, the basis of this exceptional CO2 tolerance is unknown. Here, white sturgeon, Acipenser transmontanus, were exposed to elevated CO2 to investigate the mechanisms associated with short-term hypercarbia tolerance. During exposure to 1.5 kPa Pco2, transient blood pH [extracellular pH (pHe)] depression was compensated within 24 h and associated with net plasma HCO3- accumulation and equimolar Cl- loss, and changes in gill morphology, such as a decrease in apical surface area of mitochondrial-rich cells. These findings indicate that pHe recovery at this level of hypercarbia is accomplished in a manner similar to most freshwater teleost species studied to date, although branchial mechanisms involved may differ. White sturgeon exposed to more severe hypercarbia (3 and 6 kPa Pco2) for 48 h exhibited incomplete pH compensation in blood and red blood cells. Despite pHe depression, intracellular pH (pHi) of white muscle, heart, brain, and liver did not decrease during a transient (6 h of 1.5 kPa Pco2) or prolonged (48 h at 3 and 6 kPa Pco2 blood acidosis. This pHi protection was not due to high intrinsic buffering in tissues. Such tight active cellular regulation of pHi in the absence of pHe compensation represents a unique pattern for non-air-breathing fishes, and we hypothesize that it is the basis for the exceptional CO2 tolerance of white sturgeon and, likely, other CO2 tolerant fishes. Further research to elucidate the specific mechanisms responsible for this tremendous pH regulatory capacity in tissues of white sturgeon is warranted.

  3. Interaction of osmoregulatory and acid-base compensation in white sturgeon (Acipenser transmontanus) during exposure to aquatic hypercarbia and elevated salinity.

    Science.gov (United States)

    Shaughnessy, Ciaran A; Baker, Dan W; Brauner, Colin J; Morgan, John D; Bystriansky, Jason S

    2015-09-01

    Migratory fishes encounter a variety of environmental conditions, including changes in salinity, temperature and dissolved gases, and it is important to understand how these fishes are able to acclimate to multiple environmental stressors. The gill is the primary site of both acid-base balance and ion regulation in fishes. Many ion transport mechanisms involved with acid-base compensation are also required for the regulation of plasma Na(+) and Cl(+), the predominant extracellular ions, potentially resulting in a strong interaction between ionoregulation and acid-base regulation. The present study examined the physiological interaction of elevated dissolved CO2 (an acid-base disturbance) on osmoregulation during seawater acclimation (an ionoregulatory disturbance) in juvenile white sturgeon (Acipenser transmontanus). Blood pH (pHe), plasma [HCO3 (-)], [Na(+)], [Cl(-)] and osmolality, white muscle water content, and gill Na(+)/K(+)-ATPase (NKA) and Na(+)/K(+)/2Cl(-) co-transporter (NKCC) abundance were examined over a 10 day seawater (SW) acclimation period under normocarbia (NCSW) or during prior and continued exposure to hypercarbia (HCSW), and compared with a normocarbic freshwater (NCFW) control. Hypercarbia induced a severe extracellular acidosis (from pH 7.65 to pH 7.2) in HCSW sturgeon, and these fish had a 2-fold greater rise in plasma osmolarity over NCSW by day 2 of SW exposure. Interestingly, pHe recovery in HCSW was associated more prominently with an elevation in plasma Na(+) prior to osmotic recovery and more prominently with a reduction in plasma Cl(-) following osmotic recovery, indicating a biphasic response as the requirements of osmoregulation transitioned from ion-uptake to ion-excretion throughout SW acclimation. These results imply a prioritization of osmoregulatory recovery over acid-base recovery in this period of combined exposure to acid-base and ionoregulatory disturbances.

  4. Mercury concentrations in gonad, liver, and muscle of white sturgeon Acipenser transmontanus in the lower Columbia River.

    Science.gov (United States)

    Webb, M A H; Feist, G W; Fitzpatrick, M S; Foster, E P; Schreck, C B; Plumlee, M; Wong, C; Gundersen, D T

    2006-04-01

    This study determined the partitioning of total mercury in liver, gonad, and cheek muscle of white sturgeon (Acipenser transmonatus) in the lower Columbia River. The relationship between tissue mercury concentrations and various physiologic parameters was assessed. White sturgeon were captured in commercial fisheries in the estuary and Bonneville, The Dalles, and John Day Reservoirs. Condition factor (CF), relative weight (Wr), and gonadosomatic index (GSI) were determined for each fish (n = 57). Gonadal tissue was examined histologically to determine sex and stage of maturity. Liver (n = 49), gonad (n = 49), and cheek muscle (n = 57) were analyzed for total mercury using cold-vapor atomic fluorescence spectrophotometry. Tissue protein concentrations were measured by ultraviolet-visible spectroscopy. Plasma was analyzed for testosterone (T), 11-ketotestosterone (KT), and 17ss-estradiol (E2) using radioimmunoassay. Mean tissue mercury concentrations were higher in muscle compared with liver and gonad at all sampling locations, except Bonneville Reservoir where mean liver mercury content was the highest tissue concentration observed in the study. Significant negative correlations between plasma androgens (T and KT) and muscle mercury content and plasma E2 and liver mercury content were found. A significant positive linear relationship between white sturgeon age and liver mercury concentrations was evident. Significant negative correlations between CF and relative weight and gonad and liver mercury content were found. In addition, immature male sturgeon with increased gonad mercury content had decreased GSIs. These results suggest that mercury, in the form of methylmercury, may have an effect on the reproductive potential of white sturgeon.

  5. Acute sensitivity of white sturgeon (Acipenser transmontanus) and rainbow trout (Oncorhynchus mykiss) to copper, cadmium, or zinc in water-only laboratory exposures.

    Science.gov (United States)

    Calfee, Robin D; Little, Edward E; Puglis, Holly J; Scott, Erinn; Brumbaugh, William G; Mebane, Christopher A

    2014-10-01

    The acute toxicity of cadmium, copper, and zinc to white sturgeon (Acipenser transmontanus) and rainbow trout (Oncorhynchus mykiss) were determined for 7 developmental life stages in flow-through water-only exposures. Metal toxicity varied by species and by life stage. Rainbow trout were more sensitive to cadmium than white sturgeon across all life stages, with median effect concentrations (hardness-normalized EC50s) ranging from 1.47 µg Cd/L to 2.62 µg Cd/L with sensitivity remaining consistent during later stages of development. Rainbow trout at 46 d posthatch (dph) ranked at the 2nd percentile of a compiled database for Cd species sensitivity distribution with an EC50 of 1.46 µg Cd/L and 72 dph sturgeon ranked at the 19th percentile (EC50 of 3.02 µg Cd/L). White sturgeon were more sensitive to copper than rainbow trout in 5 of the 7 life stages tested with biotic ligand model (BLM)-normalized EC50s ranging from 1.51 µg Cu/L to 21.9 µg Cu/L. In turn, rainbow trout at 74 dph and 95 dph were more sensitive to copper than white sturgeon at 72 dph and 89 dph, indicating sturgeon become more tolerant in older life stages, whereas older trout become more sensitive to copper exposure. White sturgeon at 2 dph, 16 dph, and 30 dph ranked in the lower percentiles of a compiled database for copper species sensitivity distribution, ranking at the 3rd (2 dph), 5th (16 dph), and 10th (30 dph) percentiles. White sturgeon were more sensitive to zinc than rainbow trout for 1 out of 7 life stages tested (2 dph with an biotic ligand model-normalized EC50 of 209 µg Zn/L) and ranked in the 1st percentile of a compiled database for zinc species sensitivity distribution.

  6. Tissue specificity of aryl hydrocarbon receptor (AhR) mediated responses and relative sensitivity of white sturgeon (Acipenser transmontanus) to an AhR agonist.

    Science.gov (United States)

    Doering, Jon A; Wiseman, Steve; Beitel, Shawn C; Tendler, Brett J; Giesy, John P; Hecker, Markus

    2012-06-15

    Sturgeons are endangered in some parts of the world. Due to their benthic nature and longevity sturgeon are at greater risk of exposure to bioaccumulative contaminants such as dioxin-like compounds that are associated with sediments. Despite their endangered status, little research has been conducted to characterize the relative responsiveness of sturgeon to dioxin-like compounds. In an attempt to study the biological effects and possible associated risks of exposure to dioxin-like compounds in sturgeon, the molecular and biochemical responses of white sturgeon (Acipenser transmontanus) to a model aryl hydrocarbon receptor (AhR) agonist, β-naphthoflavone (βNF) were investigated. White sturgeon were injected intraperitoneally with one of three doses of βNF (0, 50, or 500mg/kg, bw). Rainbow trout (Oncorhynchus mykiss) were used as a reference species since their responses have been well characterized in the past. Three days following injection with βNF, fish were euthanized and livers, gills, and intestines collected for biochemical and molecular analyses. White sturgeon exposed to βNF had significantly greater ethoxyresorufin O-deethylase (EROD) activity in liver (up to 37-fold), gill (up to 41-fold), and intestine (up to 36-fold) than did unexposed controls. Rainbow trout injected with βNF exhibited EROD activity that was significantly greater in liver (88-fold), than that of controls, but was undetectable in gills or intestine. Abundance of CYP1A transcript displayed a comparable pattern of tissue-specific induction with intestine (up to 189-fold), gills (up to 53-fold), and liver (up to 21-fold). Methoxyresorufin O-deethylase (MROD) and pentoxyresorufin O-deethylase (PROD) activities were undetectable in unexposed white sturgeon tissues while exposed tissues displayed MROD activity that was only moderately greater than the activity that could be detected. Differential inducibility among liver, gill, and intestine following exposure to an AhR agonist is

  7. Effects of thermal regime on ovarian maturation and plasma sex steroids in farmed white sturgeon, Acipenser transmontanus

    Science.gov (United States)

    Webb, M.A.H.; Van Eenennaam, J. P.; Feist, G.W.; Linares-Casenave, J.; Fitzpatrick, M.S.; Schreck, C.B.; Doroshov, S.I.

    2001-01-01

    Recently, commercial aquaculture farms in Northern California have exposed gravid, cultured white sturgeon females to cold water (12 ?? 1??C) throughout the late phase of vitellogenesis and ovarian follicle maturation resulting in improved ovulation rates and egg quality. However, the optimum timing for transfer of broodfish to the cold water and the capacity of transferred broodfish to maintain reproductive competence over an extended time in cold water had not been evaluated. Gravid white sturgeon females that have been raised at water temperatures of 16-20??C were transported to either cold water (12 ?? 1??C; Group 1) in November 1997 or maintained in ambient water temperatures (10-19??C; Group 2) until early spring. In March 1998, half of the fish in Group 2 had regressed ovaries, but the remaining females had intact ovarian follicles and were transported to the cold water. Ovarian follicles and blood were collected from females until they reached the stage of spawning readiness (determined by germinal vesicle position and an oocyte maturation assay) or underwent ovarian regression. Exposure of gravid sturgeon females to ambient water temperatures (14.5 ?? 2.3??C, mean ?? S.D.) from October to March led to a decrease in plasma sex steroids and a high incidence of ovarian regression in fish with a more advanced stage of oocyte development. Transfer of females with intact ovarian follicles to cold water (12 ?? 1??C) in the fall or early spring resulted in normal ovarian development in the majority of females. Holding females in cold water does not seem to override their endogenous reproductive rhythms but extends their capacity to maintain oocyte maturational competence over a longer period of time. A temperature-sensitive phase in ovarian development may occur during the transition from vitellogenic growth to oocyte maturation, and the degree and timing of sensitivity to environmental temperature are dependent on the female's endogenous reproductive rhythm

  8. Identification of the origin and localization of chorion (egg envelope) proteins in an ancient fish, the white sturgeon, Acipenser transmontanus.

    Science.gov (United States)

    Murata, Kenji; Conte, Fred S; McInnis, Elizabeth; Fong, Tak Hou; Cherr, Gary N

    2014-06-01

    In many modern teleost fish, chorion (egg envelope) glycoproteins are synthesized in the liver of females, and the expression of those genes is controlled by endogenous estrogen released from the ovary during maturation. However, among the classical teleosts, such as salmonid, carp, and zebrafish, the chorion glycoproteins are synthesized in the oocyte, as in higher vertebrates. Sturgeon, which are members of the subclass Chondrostei, represent an ancient lineage of ray-finned fishes that differ from other teleosts in that their sperm possess acrosomes, their eggs have numerous micropyles, and early embryo development is similar to that of amphibians. In order to understand the molecular mechanisms of chorion formation and the phylogenetic relationship between sturgeon and other teleosts, we used specific antibodies directed against the primary components of sturgeon chorion glycoproteins, using immunoblotting and immunocytochemistry approaches. The origin of each chorion glycoprotein was determined through analyses of both liver and ovary, and their localization during ovarian development was investigated. Our data indicate that the origin of the major chorion glycoproteins of sturgeon, ChG1, ChG2, and ChG4, derive not only from the oocyte itself but also from follicle cells in the ovary, as well as from hepatocytes. In the follicle cell layer, granulosa cells were found to be the primary source of ChGs during oogenesis in white sturgeon. The unique origins of chorion glycoproteins in sturgeon suggest that sturgeons are an intermediate form in the evolution of the teleost lineage.

  9. Metabolic changes associated with acid-base regulation during hypercarbia in the CO2-tolerant chondrostean, white sturgeon (Acipenser transmontanus).

    Science.gov (United States)

    Baker, Daniel W; Brauner, Colin J

    2012-01-01

    CO(2) tolerance in white sturgeon is associated with the ability to tightly regulate intracellular pH (pHi) despite a large reduction in extracellular pH (pHe) termed preferential pHi regulation. How this regulatory response affects whole animal metabolic rate is unknown. Accordingly, we characterized oxygen consumption rate ( [Formula: see text] ) and metabolically-relevant organismal and cellular responses in white sturgeon during exposure to hypercarbia. White sturgeon were able to protect intracellular pH (pHi) in liver and white muscle as early as 6h (the earliest time period investigated) following exposure to severe (sub-lethal) hypercarbia (45 and 90 mm Hg PCO(2)). Sturgeon exposed to 15 and 30 mm Hg PCO(2) exhibited pHe compensation and significant increases in [Formula: see text] (up to 80% greater than control values). In contrast, severe hypercarbia (≥45 mm Hg PCO(2)) elicited an uncompensated reduction in pHe (up to ~1.0 pH units) and red blood cells (as great as ~0.5 pH units), and was accompanied by 30 and 60% reductions in [Formula: see text] , respectively. While behavioral, respiratory and cellular responses to hypercarbia were observed, none corresponded well with the pattern or magnitude of changes in [Formula: see text] . The findings of this research provide empirical support for the hypothesis that preferential pHi regulation is not metabolically costly, and thus may have been a strategy strongly selected for in fishes encountering short-term hypercarbia.

  10. Identification and expression of aryl hydrocarbon receptors (AhR1 and AhR2) provide insight in an evolutionary context regarding sensitivity of white sturgeon (Acipenser transmontanus) to dioxin-like compounds.

    Science.gov (United States)

    Doering, Jon A; Wiseman, Steve; Beitel, Shawn C; Giesy, John P; Hecker, Markus

    2014-05-01

    Sturgeons are ancient fishes, which are endangered in many parts of the world. Due to their benthic nature and longevity, sturgeon are at great risk of exposure to bioaccumulative contaminants such as dioxin-like compounds (DLCs). Despite their endangered status, little research has been conducted to characterize the relative sensitivity of sturgeons to DLCs. Proper assessment of risk of DLCs posed to these fishes therefore, requires a better understanding of this sensitivity and the factors that are driving it. Adverse effects associated with exposure to DLCs are mediated by the aryl hydrocarbon receptor (AhR). This study identified and characterized two distinct AhRs, AhR1 and AhR2, in white sturgeon (Acipenser transmontanus) for the first time as a first step in studying the relative sensitivities of sturgeons to DLCs. Furthermore, tissue-specific expression of both AhRs under basal conditions and in response to exposure to the model DLC, β-naphthoflavone (βNF), was determined. The sequence of amino acids of AhR1 of white sturgeon had greater similarity to AhRs of tetrapods, including amphibians, birds, and mammals, than to AhR1s of other fishes. The sequence of amino acids in the ligand binding domain of the AhR1 had greater than 80% similarity to AhRs known to bind DLCs and was less similar to AhRs not known to bind DLCs. AhR2 of white sturgeon had greatest similarity to AhR2 of other fishes. Profiles of expression of AhR1 and AhR2 in white sturgeon were distinct from those known in other fishes and appear more similar to profiles observed in birds. Expressions of both AhR1 and AhR2 of white sturgeon were greatest in liver and heart, which are target organs for DLCs. Furthermore, abundances of transcripts of AhR1 and AhR2 in all tissues from white sturgeon were greater than controls (up to 35-fold) following exposure to βNF. Based upon both AhRs having similar abundances of transcript in target organs of DLC toxicity, both AhRs being up-regulated following

  11. 高首鲟背听侧核电感受神经元在电场刺激下的反应特性%Response properties of the electrosensory neurons in hindbrain of the white sturgeon, Acipenser transmontanus

    Institute of Scientific and Technical Information of China (English)

    张旭光; HendrikHerzog; 宋佳坤; 王晓杰; 范纯新; 郭弘艺

    2011-01-01

    目的 软骨硬鳞鱼类的电感受是一种古老的感觉系统,它们通过电感受器官感受生物电场或非生物电场进行摄食等活动.支配电感受器的初级传入神经首先将电感受信息传递至后脑的背听侧核进行处理.本文探讨了鲟鱼背听侧核的电生理特性.方法 采用胞外记录方法记录了高首鲟背听侧核在偶极子电场刺激下的神经元反应.结果 背听侧核神经元有低频(<l0 Hz)自发放电和高频(>10 Hz)自发放电两种,在电场刺激下均产生明显的自发放电的调制和相位耦合反应,同时部分神经元对偶极子电场的方向有选择性.结论 鲟鱼的电感受神经元反应特征与其电感受的生物功能相适应.%Objective The passive electrosense is a primitive sensory modality in the Chondrostei,which include sturgeon and paddlefish.Using electroreceptors,these fish detect the weak electric fields from other animals or geoelectric sources,and use this information for prey detection or other behaviors.The primary afferent fibers innervating the electroreceptors project to a single hindbrain target called the dorsal octavolateral nucleus(DON),where the electrosensory information is first processed.Here,we investigated the electrophysiological properties of DON neurons.Methods Extracellular recording was used to investigate the response properties of DON neurons to dipole electric fields with different amplitudes and frequencies in the white sturgeon,Acipenser transmontanus.Results The DON neurons showed regular spontaneous activity and could be classified into two types:neurons with a low spontaneous rate(<10 Hz)and those with a high spontaneous rate(> 10 Hz).In response to sinusoidal electric field stimuli,DON neurons showed sinusoidally-modulated and phase-locked firing.In addition,neurons showed opposite phase responses corresponding to the different directions of the dipole.Conclusion The response properties of DON neurons match the

  12. Using drift nets to capture early life stages and monitor spawning of the yangtze river chinese sturgeon (Acipenser sinensis)

    Science.gov (United States)

    Wei, Q.W.; Kynard, B.; Yang, D.G.; Chen, X.H.; Du, H.; Shen, L.; Zhang, H.

    2009-01-01

    A sampling system for capturing sturgeon eggs using a D-shaped bottom anchored drift net was used to capture early life stages (ELS) of Chinese sturgeon, Acipenser sinensis, and monitor annual spawning success at Yichang on the Yangtze River, 1996-2004, before and just after the Three Gorges Dam began operation. Captured were 96 875 ELS (early life stages: eggs, yolk-sac larvae = eleuthero embryos, and larvae); most were eggs and only 2477 were yolk-sac larvae. Most ELS were captured in the main river channel and inside the bend at the Yichang spawning reach. Yolk-sac larvae were captured for a maximum of 3 days after hatching began, indicating quick dispersal downstream. The back-calculated day of egg fertilization over the eight years indicated a maximum spawning window of 23 days (20 October-10 November). Spawning in all years was restricted temporally, occurred mostly at night and during one or two spawning periods, each lasting several days. The brief temporal spawning window may reduce egg predation by opportunistic predators by flooding the river bottom with millions of eggs. During 1996-2002, the percentage of fertilized eggs in an annual 20-egg sample was between 63.5 to 94.1%; however, in 2003 the percentage fertilized was only 23.8%. This sudden decline may be related to the altered environmental conditions at Yichang caused by operation of the Three Gorges Dam. Further studies are needed to monitor spawning and changes in egg fertilization in this threatened population. ?? 2009 Blackwell Verlag GmbH.

  13. 50 CFR 600.1400 - Definitions.

    Science.gov (United States)

    2010-10-01

    ... sturgeon: Acipenser oxyrhynchus oxyrhynchus Shortnose sturgeon: Acipenser brevirostrum Gulf sturgeon: Acipenser oxyrhynchus desotoi White sturgeon: Acipenser transmontanus Green sturgeon: Acipenser...

  14. Histopathological alterations of juvenile green (Acipenser medirostris) and white sturgeon (Acipenser transmontanus) exposed to graded levels of dietary methylmercury.

    Science.gov (United States)

    Lee, Jang-Won; Kim, Jae-Won; De Riu, Nicola; Moniello, Giuseppe; Hung, Silas S O

    2012-03-01

    Triplicate groups of juvenile green and white sturgeon (average weight of 30 ± 2 g) were exposed to one of four concentrations of dietary methylmercury (MeHg; 0, 25, 50, and 100 mg MeHg/kg diet) for 8 weeks to determine and compare the sensitivity of the two sturgeon species from a histopathological perspective. After 4- and 8-week exposure, histological changes were examined in the kidney, liver, gill, skeletal muscle, and heart muscle of both species using light microscopy. Marked abnormalities were observed in the kidney and liver of both sturgeon species after each exposure period; the abnormalities showed progressive histological alterations in severity with increasing doses and duration of exposure. Renal lesions included tubular epithelium degeneration and necrosis, renal corpuscular disintegration, and interstitial tissue degeneration. The changes observed in the livers of both sturgeon species were glycogen depletion and vacuolar degeneration. In the gill and skeletal and heart muscle of green and white sturgeon fed MeHg-added diets, mild histological changes were observed but did not show pronounced difference between the two species. Although the lowest observed effect concentration in both species was the 25 mg MeHg/kg diet, the histological changes in the kidney and liver were more pronounced at all treatments groups of green sturgeon than those of white sturgeon. The current results on structural changes of kidney and liver (i.e., more severe glycogen depletion and tubular epithelium degeneration in green sturgeon) confirmed our previous results, in that green sturgeon exhibited a higher mortality, lower growth rate, and lower protein, lipid, and energy contents in their whole body than white sturgeon under the same MeHg exposures.

  15. Olfactory projections in the white sturgeon, Acipenser transmontanus: an experimental study.

    Science.gov (United States)

    Northcutt, R Glenn

    2011-07-01

    Telencephalic evolution in ray-finned fishes shows increasing complexity from polypteriform fishes through sturgeons to teleosts. Telencephalic organization in sturgeons is thus critical to our understanding of ray-finned fish evolution, but it is poorly understood, particularly as regards the roof or pallium. Two major hypotheses exist regarding the medial part of area dorsalis (Dm): that Dm is extended; and that Dm is restricted. The extent and topography of secondary olfactory projections to the pallium are critical in evaluating these hypotheses, but there is little agreement regarding these projections. Olfactory projections in the white sturgeon were therefore examined by using the carbocyanine probe DiI, biocytin, and biotinylated dextrin amine (BDA). Both DiI and BDA revealed primary olfactory projections to the olfactory bulb and primary extrabulbar projections widely in the telencephalon and to more restricted regions of the diencephalon. Myelinated secondary olfactory fibers caused DiI to be less effective in labeling secondary olfactory projections, which terminate in all subpallial nuclei and in the pallium: sparsely in the medial pallial division (Dm); heavily in the posterior pallial division (Dp); and more lightly in the lateral pallial division (Dl). In the diencephalon, substantial secondary olfactory projections were seen to the habenular nuclei, the rostral pole of the inferior lobe, and several nuclei of the posterior tubercle. All secondary olfactory projections were bilateral but heavier ipsilaterally. Bulbopetal neurons were located in both pallial and subpallial centers and were more numerous ipsilaterally. These results corroborate an earlier experimental study on the shovelnose sturgeon and indicate a restricted Dm in sturgeons.

  16. Effects of feed restriction on salinity tolerance in white sturgeon (Acipenser transmontanus).

    Science.gov (United States)

    Lee, Seunghyung; Fadel, James G; Haller, Liran Y; Verhille, Christine E; Fangue, Nann A; Hung, Silas S O

    2015-10-01

    A multistressor study was conducted to investigate interactive effects of nutritional status and salinity on osmoregulation of juvenile white sturgeon. Our hypothesis was that lower nutritional status would decrease the salinity tolerance of juvenile white sturgeon. A four-week feed restriction (12.5%, 25%, 50%, 100% of optimum feeding rate: OFR defined as the rate (% body weight per day) at which growth is maximal) trial was performed, and relevant indices of nutritional status were measured. Following the trial, sturgeon were acutely exposed to various salinities (0, 8, 16, 24 ppt) for 120 h, and relevant osmoregulatory measurements were made at 12, 72, and 120 h post-salinity exposures. The feed-restriction trial resulted in a graded nutritional response with the most feed-restricted group (12.5% OFR) showing the lowest nutritional status. The salinity exposure trial showed clear evidence that lower nutritional status decreased the salinity tolerance of juvenile white sturgeon. Increasing salinities resulted in significant alterations in osmoregulatory indices of all feeding groups; however, a significantly slower acclimatory response to 24 ppt was detected in the most feed-restricted group compared to the non-feed-restricted group (100% OFR). Furthermore, evaluation of the effect of nutritional status on the relationship between osmoregulatory measurements and body size showed that there was a significant negative relationship between osmoregulatory performance and body size within the most feed-restricted group. This suggests that there is a certain body size range (200-300 g based on our finding) where juvenile white sturgeon can maximize osmoregulatory capacity at a salinity of 24 ppt.

  17. Immunohistochemical organization of the forebrain in the white sturgeon, Acipenser transmontanus.

    Science.gov (United States)

    Piñuela, Carmen; Northcutt, R Glenn

    2007-01-01

    The distribution of substance P (SP), leucine-enkephalin (LENK), serotonin (5HT), dopamine (DA), and tyrosine hydroxylase (TH) was examined in the forebrain of the white sturgeon in order to evaluate several anatomical hypotheses based on cytoarchitectonics, and to gain a better understanding of the evolution of the forebrain in ray-finned fishes. The subpallium of the telencephalon has the highest concentration of the neuropeptides SP and LENK, allowing the pallial-subpallial border to be easily distinguished. The distribution of dopamine is similar to that of serotonin in the subpallium, fibers positive for these transmitters are particularly dense in the dorsal and ventral divisions of the subpallium. In addition, a small population of DA- and 5HT-positive cell bodies--which appear to be unique to sturgeons--was identified at the level of the anterior commissure. The internal granular layer of the olfactory bulbs had large numbers of TH-positive cell bodies and fibers, as did the rostral subpallium. The occurrence of cell bodies positive for LENK in the dorsal nucleus of the rostral subpallium supports the hypothesis that this nucleus is homologous to the striatum in other vertebrates. This is further reinforced by the apparent origin of an ascending dopaminergic pathway from cells in the posterior tubercle that are likely homologous to the ventral tegmental area/substantia nigra in land vertebrates. Finally, the differential distribution of SP and TH in the pallium supports the hypothesis that the pallium, or area dorsalis, can be divided medially into a rostral division (Dm), a caudal division (Dp) that is the main pallial target of secondary olfactory projections, and a narrow lateral division (Dd+Dl) immediately adjacent to the attachment of the tela choroidea along the entire rostrocaudal length of the telencephalic hemisphere.

  18. Confirmation of ovarian homogeneity in post-vitellogenic cultured white sturgeon, Acipenser transmontanus.

    Science.gov (United States)

    Talbott, Mariah J; Servid, Sarah A; Cavinato, Anna G; Van Eenennaam, Joel P; Doroshov, Serge I; Struffenegger, Peter; Webb, Molly A H

    2014-02-01

    Assessing stage of oocyte maturity in female sturgeon by calculating oocyte polarization index (PI) is a necessary tool for both conservation propagation managers and caviar producers to know when to hormonally induce spawning. We tested the assumption that sampling ovarian follicles from one section of one ovary is sufficient for calculating an oocyte PI representative of oocyte maturity for an individual animal. Short-wavelength near-infrared spectroscopy (SW-NIR) scans were performed on three positions per ovary for five fish prior to caviar harvest. Samples of ovarian follicles were subsequently taken from the exact location of the SW-NIR scans for calculation of oocyte PI and follicle diameter. Oocyte PI was statistically different though not biologically relevant within an ovary and between ovaries in four of five fish. Follicle diameter was statistically different but not biologically relevant within an ovary in three of five fish. There were no differences in follicle diameter between ovaries. No statistical differences were observed between SW-NIR spectra collected at different locations within an ovary or between ovaries. These results emphasize the importance of utilizing both oocyte PI measurement and progesterone-induced oocyte maturation assays while deciding when to hormonally induce spawning in sturgeon females.

  19. Intersex gonad differentiation in cultured Russian (Acipenser gueldenstaedtii) and Siberian (Acipenser baerii) sturgeon.

    Science.gov (United States)

    Rzepkowska, Malgorzata; Ostaszewska, Teresa; Gibala, Monika; Roszko, Marek Lukasz

    2014-02-01

    Among sturgeons, the occurrence of individuals with gonads containing both testis and ovary components is considered pathological, and such fish are described as intersex individuals or intersexes. Intersexes are observed in both wild and cultured populations of sturgeon, usually at low frequencies. In the present study, intersex Russian (Acipenser gueldenstaedtii) and Siberian (Acipenser baerii) sturgeons constituted 30% of the studied populations. Macroscopically, intersex gonads were recognizable from 500 days posthatching (dph). Initially, gonads with predominantly male characteristics (testis-ova) were observed, but in older fish gonads with predominantly female traits (ova-testis) were more frequent. Using microscopic analysis, intersex gonads were discernible by 130-200 dph. Observations of intersex germinal epithelium development and analysis of sex distribution in the study populations indicated that feminization was occurring. Histological analysis revealed that differentiation of the germinal epithelium in such gonads was accompanied by various morphological alterations (transformations) that were described using quantitative and localization criteria. The most common type of transformations, massive subepithelial transformations, was manifested by the presence of abundant female germinal tissue located under the gonad surface epithelium in the developing testis. These transformations were identified in the early development stage (100-200 dph). In this type of transformation, differentiation of female germinal tissue at the gonad surface and male tissue at the mesorchium/mesovarium resulted in complete formation of both male and female germinal epithelia within the same gonad.

  20. Toxicity of copper to early-life stage Kootenai River white sturgeon, Columbia River white sturgeon, and rainbow trout.

    Science.gov (United States)

    Little, E E; Calfee, R D; Linder, G

    2012-10-01

    White sturgeon (Acipenser transmontanus) populations throughout western North America are in decline, likely as a result of overharvest, operation of dams, and agricultural and mineral extraction activities in their watersheds. Recruitment failure may reflect the loss of early-life stage fish in spawning areas of the upper Columbia River, which are contaminated with metals from effluents associated with mineral-extraction activities. Early-life stage white sturgeon (A. transmontanus) from the Columbia River and Kootenai River populations were exposed to copper during 96-h flow-through toxicity tests to determine their sensitivity to the metal. Similar tests were conducted with rainbow trout (RBT [Oncorhynchus mykiss]) to assess the comparative sensitivity of this species as a surrogate for white sturgeon. Exposures were conducted with a water quality pH 8.1-8.3, hardness 81-119 mg/L as CaCO(2), and dissolved organic carbon 0.2-0.4 mg/L. At approximately 30 days posthatch (dph), sturgeon were highly sensitive to copper with median lethal concentration (LC(50)) values ranging from 4.1 to 6.8 μg/L compared with 36.5 μg/L for 30 dph RBT. White sturgeon at 123-167 dph were less sensitive to copper with LC(50) values ranging from 103.7 to 268.9 μg/L. RBT trout, however, remained more sensitive to copper at 160 dph with an LC(50) value of 30.9 μg/L. The results indicate that high sensitivity to copper in early-life stage white sturgeon may be a factor in recruitment failure occurring in the upper Columbia and Kootenai rivers. When site-specific water-quality criteria were estimated using the biotic ligand model (BLM), derived values were not protective of early-life stage fish, nor were estimates derived by water-hardness adjustment.

  1. The effects of commercial diets on performance, muscle proximate composition and waste loads of white sturgeon (Acipenser transmontanus

    Directory of Open Access Journals (Sweden)

    S. Garavello

    2011-03-01

    Full Text Available The rearing of sturgeons has shown a considerable increase in recent years, also in Italy (Ronyai and Varadi,1995, both for the caviar and for the meat, under increasing demand (Williot and Bourguignon,1991. There is still little information on the nutrient requirements and optimal feeding rates of white sturgeon (Hung, 1991, even if specific diets for this species are now available on market...

  2. Exceptional CO₂ tolerance in white sturgeon (Acipenser transmontanus) is associated with protection of maximum cardiac performance during hypercapnia in situ.

    Science.gov (United States)

    Baker, Daniel W; Hanson, Linda M; Farrell, Anthony P; Brauner, Colin J

    2011-01-01

    White sturgeon rank among the most CO₂-tolerant fish species examined to date. We investigated whether this exceptional CO₂ tolerance extended to the heart, an organ generally viewed as acidosis intolerant. Maximum cardiac output (Q(max)) and maximum cardiac power output (PO(max)) were assessed using a working, perfused, in situ heart preparation. Exposure to a Pco₂ of 3 kPa for 20 min had no significant effect on maximum cardiac performance, while exposure to 6-kPa Pco₂ reduced heart rate, Q(max), PO(max), and rate of ventricular force generation (F(O)) by 23%, 28%, 26%, and 18%, respectively; however, full recovery was observed in all these parameters upon return to control conditions. These modest impairments during exposure to 6-kPa Pco₂ were associated with partially compensated intracellular ventricular acidosis. Maximum adrenergic stimulation (500 nmol L⁻¹ adrenaline) during 6-kPa Pco₂ protected maximum cardiac performance via increased inotropy (force of contraction) without affecting heart rate. Exposure to higher CO₂ levels associated with morbidity in vivo (i.e., 8-kPa Pco₂) induced arrhythmia and a reduction in stroke volume during power assessment. Clearly, white sturgeon hearts are able to increase cardiac performance during severe hypercapnia that is lethal to other fishes. Future work focusing on atypical aspects of sturgeon cardiac function, including the lack of chronotropic response to adrenergic stimulation during hypercapnia, is warranted.

  3. Selenium tissue burden compartmentalization in resident white sturgeon (Acipenser transmontanus) of the San Francisco Bay Delta estuary.

    Science.gov (United States)

    Linares-Casenave, Javier; Linville, R; Van Eenennaam, J P; Muguet, J B; Doroshov, S I

    2015-01-01

    High selenium (Se) loads in the San Francisco Bay Delta are bioaccumulated and biomagnified in food webs and can impair the reproduction of resident oviparous animals such as white sturgeon. The objective of the present study was to determine the Se tissue burden in San Francisco Bay Delta-resident white sturgeon to assess Se bioaccumulation in different organs, including ovaries and liver where egg yolk precursor proteins are synthesized. The authors obtained 54 San Francisco Bay Delta-resident white sturgeon including 26 female and 28 male subadults with immature gonads, 8 females with vitellogenic eggs, and 13 males with maturing gonads. Length, weight, age, reproductive stage of development, and kidney, liver, gonad, and muscle Se concentrations were determined in all fish. Concentrations of Se in muscle, gonads, and liver significantly increased with fish size, whereas kidney Se was not correlated to body size and was at the highest level compared with other organs. There was no difference between the sexes (p > 0.05) in Se concentrations in kidney (12.83 ± 0.51 µg · g(-1) dry wt), liver (11.85 ± 1.04 µg · g(-1) dry wt), and muscle (7.09 ± 0.52 µg · g(-1) dry wt; mean ± standard error, n = 47); but Se concentration was higher in the ovary than in testis (p = 0.04). Females with vitellogenic eggs had higher Se concentrations in the ovaries (20.77 ± 4.11 µg · g(-1) dry wt vs 5.22 ± 2.50 µg · g(-1) dry wt), liver (21.84 ± 2.07 µg · g(-1) dry wt vs 8.03 ± 1.03 µg · g(-1) dry wt), and muscle (10.18 ± 1.93 µg · g(-1) dry wt vs 5.48 ± 0.64 µg · g(-1) dry wt) compared with less advanced, previtellogenic females (p white sturgeon were comparable with levels previously shown to cause reproductive toxicity in dietary Se experiments with captive white sturgeon.

  4. Effects of dietary methylmercury on growth performance and tissue burden in juvenile green (Acipenser medirostris) and white sturgeon (A. transmontanus).

    Science.gov (United States)

    Lee, Jang-Won; De Riu, Nicola; Lee, Seunghyung; Bai, Sungchul C; Moniello, Giuseppe; Hung, Silas S O

    2011-10-01

    Triplicate groups of juvenile green and white sturgeon (30 ± 2 g) were exposed to one of the four nominal concentrations of dietary methylmercury (MeHg, 0 (control), 25, 50, and 100mg MeHg/kg diet) for 8 weeks to determine and compare the effects on growth performance and mercury (Hg) tissue burden in the two sturgeon species. Mortality, growth performance as measured by percent body weight increase per day, hepatosomatic index, proximate composition of whole body, and Hg burden in the whole body, gill, heart, liver, kidney, and white muscle were determined to assess the adverse growth effects and bioaccumulation of dietary MeHg in sturgeon. Significantly higher mortality and lower growth rate (pwhite sturgeon fed the MeHg diets compared to the controls. Green sturgeon fed the MeHg diets exhibited earlier and more severe adverse effects compared to white sturgeon. Mercury accumulated in all tissues in a dose-dependent manner regardless of species, and the highest Hg concentrations were found in the kidneys of both species. Dietary MeHg had no significant effect (p>0.05) on the whole body proximate compositions of either sturgeon species. In conclusion, green sturgeon was more susceptible to dietary MeHg toxicity than white sturgeon in our 8-week growth experiment based on the higher mortality and lower growth rate and body energy contents.

  5. Using blood plasma for monitoring organochlorine contaminants in juvenile white sturgeon, Acipenser transmontanus, from the lower Columbia River.

    Science.gov (United States)

    Gundersen, D T; Webb, M A H; Fink, A K; Kushner, L R; Feist, G W; Fitzpatrick, M S; Foster, E P; Schreck, C B

    2008-09-01

    Organochlorine (OC) pesticide concentrations in blood plasma samples from 88 juvenile white sturgeon collected from the lower Columbia River were measured and compared to plasma sex steroid and OC tissue levels previously measured in corresponding fish. Significant squared correlation coefficients between summation operator DDT concentrations in sturgeon plasma and gonads and livers were 0.37 and 0.32, respectively. Significant negative correlations between plasma testosterone concentration and plasma Sigma DDT concentration in male fish (r(2)=0.26), plasma 17beta estradiol concentration and plasma Sigma DDT concentration in female fish (r(2)=0.38) and condition factor and plasma Sigma DDT concentration in all fish were found (r(2)=0.17). These results suggest that blood plasma may be a suitable nondestructive method for monitoring adult sturgeon population for persistent OC contaminants.

  6. Effects of chronic exposure to dietary selenomethionine on the physiological stress response in juvenile white sturgeon (Acipenser transmontanus).

    Science.gov (United States)

    Patterson, Sarah; Zee, Jenna; Wiseman, Steve; Hecker, Markus

    2017-02-03

    Selenium (Se) is an essential micronutrient, but at low concentrations can be toxic to aquatic organisms. Selenomethionine (SeMeth) is the primary dietary form of Se aquatic organisms are exposed to and is an environmental concern because it persists and bioaccumulates. White sturgeon (WS) might be particularly susceptible to bioaccumulative toxicants, such as SeMeth, due to their longevity and benthic lifestyle. Se exposure is known to have adverse effects on the physiological stress response in teleosts, but these effects are unknown in WS. Therefore, the goal of this study was to determine effects of dietary SeMeth on the ability of WS to mount a stress response. Juvenile WS were administered food spiked with 1.4, 5.6, 22.4 and 104.4μg Se/g dry mass (dm) for 72days. Lower doses were chosen to represent environmentally relevant concentrations, while the high dose represented a worst case scenario exposure. On day 72, fish were subjected to a 2min handling stressor, and they were sampled at 0, 2 and 24h post-stressor. Cortisol, glucose and lactate concentrations were quantified in blood plasma and glycogen concentrations were quantified in muscle and liver. Transcript abundance of genes involved in corticosteroidogenesis and energy metabolism were determined using qPCR. Under basal conditions, WS fed 104.4μg Se/g dm had significantly greater concentrations of plasma cortisol and lactate, and significantly lower concentrations of plasma glucose and liver glycogen, compared to controls. Corticosteroid 11-beta dehydrogenase 2 (hsd11b2) abundance was lower in WS fed 22.4 and 104.4μg Se/g dm, indicating less conversion of cortisol to cortisone. Abundance of the glucocorticoid receptor (gcr) was significantly lower in high dose WS, suggesting lower tissue sensitivity to glucocorticoids. The increasing trend in phosphoenolpyruvate carboxykinase (pepck) abundance, with increasing SeMeth exposure, was consistent with greater cortisol and glucose concentrations in high dose WS. Exposure to an acute handling stressor elicited a typical cortisol response, but the magnitude of the response appeared to be significantly lower than those typically observed in teleosts. SeMeth also did not appear to modulate the cortisol response to a secondary stressor. However, WS exposed to 22.4μg Se/g dm and sampled 2h post-stressor, had significantly higher concentrations of muscle glycogen compared to controls, indicating effects on their ability to utilize muscle glycogen for energy. Overall, the results indicate that chronic exposure to dietary SeMeth concentrations >22.4μg/g can affect cortisol dynamics and mobilization of energy substrates in juvenile WS.

  7. 77 FR 5751 - Marine Recreational Fisheries of the United States; National Saltwater Angler Registry and State...

    Science.gov (United States)

    2012-02-06

    ... pacificus Dolly varden: Salvelinus malma Sheefish or inconnu: Stenodus leucichthys Atlantic sturgeon: Acipenser oxyrhynchus oxyrhynchus Shortnose sturgeon: Acipenser brevirostrum Gulf sturgeon: Acipenser oxyrhynchus desotoi White sturgeon: Acipenser transmontanus Green sturgeon: Acipenser medirostris Angler...

  8. Sensitivity of early life stages of white sturgeon, rainbow trout, and fathead minnow to copper.

    Science.gov (United States)

    Vardy, David W; Oellers, Johanna; Doering, Jon A; Hollert, Henner; Giesy, John P; Hecker, Markus

    2013-01-01

    Populations of white sturgeon (WS; Acipenser transmontanus) are in decline in several parts of the United States and Canada, attributed primarily to poor recruitment caused by degradation of habitats, including pollution with contaminants such as metals. Little is known about sensitivity of WS to contaminants or metals such as copper (Cu). Here, acute (96 h) mortalities of WS early life stages due to exposure to Cu under laboratory conditions are reported. Two standard test species, rainbow trout (Oncorhynchus mykiss) and fathead minnow (Pimephales promelas), were exposed in parallel to determine relative sensitivity among species. Swim-up larvae [15 days post-hatch (dph)] and early juveniles (40-45 dph) of WS were more sensitive to Cu (LC(50) = 10 and 9-17 μg/L, respectively) than were yolksac larvae (8 dph; LC(50) = 22 μg/L) and the later juvenile life stage (100 dph; LC(50) = 54 μg/L). WS were more sensitive to Cu than rainbow trout and fathead minnow at all comparable life stages tested. Yolksac larvae of rainbow trout and fathead minnow were 1.8 and 4.6 times, respectively, more tolerant than WS, while swim-up and juvenile life stages of rainbow trout were between 1.4- and 2.4-times more tolerant than WS. When plotted in a species sensitivity distribution with other fishes, the mean acute toxicity value for early life stage WS was ranked between the 1st and 2nd centile. The WS life stage of greatest Cu sensitivity coincides with the beginning of active feeding and close association with sediment, possibly increasing risk. WS early life stages are sensitive to aqueous copper exposure and site-specific water quality guidelines and criteria should be evaluated closely to ensure adequate protection.

  9. Tandem repeat sequence variation and length heteroplasmy in the mitochondrial DNA D-loop of the threatened Gulf of Mexico sturgeon, Acipenser oxyrhynchus desotoi.

    Science.gov (United States)

    Miracle, A L; Campton, D E

    1995-01-01

    Genetic variability within the Suwannee River, Florida, population of Gulf of Mexico sturgeon, Acipenser oxyrhynchus desotoi, was assessed by examining sequence and length variation within the control region, or D-loop, of the mitochondrial genome. Although once abundant throughout the Gulf of Mexico, Gulf sturgeon are now listed as a threatened species by the U.S. Fish and Wildlife Service. Mitochondrial DNA was analyzed for length variation from 168 individual Gulf sturgeon by PCR amplification and visualization of PCR products using ethidium bromide-stained agarose gels. Of the 168 individual Gulf sturgeon, 31 (18.5%) were heteroplasmic for one to four copies of an 81-base pair, tandemly repeated sequence in the D-loop region. However, no individuals homoplasmic for multiple copies of the repeat sequence were observed. The existence and nature of these tandem repeats in heteroplasmic individuals was confirmed by direct sequencing of the PCR products for a subset of 22 individuals. The results are consistent with the apparent nature and mechanism of heteroplasmy observed in a congeneric species, A. transmontanus. In addition, sequences for 187 base pairs outside of the tandem repeats were identical among all 16 individuals assayed for this region. Lack of variable sequences is concordant with earlier studies involving mtDNA restriction fragment length profiles of Gulf sturgeon found in the Suwannee River. The absence of sequence variation exclusive of the tandem repeats is consistent with the hypothesis that the subspecies has undergone a population or evolutionary bottleneck.

  10. Evaluation of lethal and non-lethal sampling methods for the detection of white sturgeon iridovirus infection in white sturgeon, Acipenser transmontanus (Richardson).

    Science.gov (United States)

    Drennan, J D; Lapatra, S E; Samson, C A; Ireland, S; Eversman, K F; Cain, K D

    2007-06-01

    Pectoral fin tissue of white sturgeon was investigated as a potential non-lethal sample source for the detection of white sturgeon iridovirus (WSIV) infection. Histopathology and polymerase chain reaction (PCR) results using fin tissue were compared with the standard lethal histopathology sampling method that utilizes head tissue. Tissues for each of the three sampling methods were collected weekly for 8 weeks from individual sturgeon undergoing an experimental cohabitation challenge with fish infected with the Abernathy isolate of WSIV. Non-lethal fin histopathological evaluation did not reveal infection during the first 3 weeks of sampling, while non-lethal PCR and the lethal method were variable. However, all three sampling methods were equally capable of identifying infection from 4 to 8 weeks post-exposure. Of the survivors tested, all were negative by PCR and the lethal method, and only one fish was identified as being positive by non-lethal fin histopathology. In another experiment, all three sampling methods were applied to asymptomatic WSIV carriers in a case study conducted at the Kootenai Tribal Sturgeon Conservation Hatchery. Results showed that both lethal and non-lethal fin histopathology were equally effective in detecting infection, but PCR was unable to identify this strain of WSIV. Depending on the virus isolate, these results suggest that non-lethal sampling of fin tissue (histopathology or PCR) is comparable with the lethal sampling method at identifying WSIV infection once infection is established, and under certain circumstances may provide an alternative to lethal sampling.

  11. Can fatty acid and mineral compositions of sturgeon eggs distinguish between farm-raised versus wild white (Acipenser transmontanus) sturgeon origins in California? Preliminary report.

    Science.gov (United States)

    DePeters, Edward J; Puschner, Birgit; Taylor, Scott J; Rodzen, Jeff A

    2013-06-10

    The objective was to investigate the potential of using fatty acid and mineral compositions of sturgeon eggs to distinguish their source, either farm-raised or wild fish. Trafficking of illegally obtained wild white sturgeon eggs is a major concern to the California Department of Fish and Game, but there is no forensic method to separate wild and farm-raised white sturgeon eggs. The extension of these findings in future work will be to use the fatty acid and mineral compositions as forensic indicators of caviar produced legally from farm raised sturgeon compared with illegal caviar produced from sturgeon poached from the wild. Samples (10) of sturgeon eggs were collected from a commercial aquaculture facility in the Sacramento Valley. Eggs from wild sturgeon (9) were obtained primarily from confiscations of illegally caught sturgeon by fish and game law enforcement personnel. The total lipid content of sturgeon eggs was analyzed for fatty acid composition. The most notable difference was the higher concentration (Psturgeon (10.0 mg/kg dry weight) than farm-raised sturgeon (2.7 mg/kg dry weight). Concentrations of iron, zinc, copper, phosphorus, sulfur, calcium, and potassium did not differ between farm-raised and wild eggs. Arsenic concentration in wild eggs was 3.3mg/kg dry weight whereas arsenic was not detected in the farm-raised eggs. Fatty acid and mineral compositions of eggs differed significantly between farm-raised and wild sturgeon and these should be investigated further as biological markers for forensic identification of caviar origin.

  12. Distinguishing ovarian maturity of farmed white sturgeon (Acipenser transmontanus) by Fourier transform infrared spectroscopy: a potential tool for caviar production management.

    Science.gov (United States)

    Lu, Xiaonan; Webb, Molly; Talbott, Mariah; Van Eenennaam, Joel; Palumbo, Amanda; Linares-Casenave, Javier; Doroshov, Serge; Struffenegger, Peter; Rasco, Barbara

    2010-04-14

    Fourier transform infrared spectroscopy (FT-IR, 4000-400 cm(-1)) was applied to blood plasma of farmed white sturgeon (N = 40) to differentiate and predict the stages of ovarian maturity. Spectral features of sex steroids (approximately 3000 cm(-1)) and vitellogenin (approximately 1080 cm(-1)) were identified. Clear segregation of maturity stages (previtellogenesis, vitellogenesis, postvitellogenesis, and follicular atresia) was achieved using principal component analysis (PCA). Progression of oocyte development in the late phase of vitellogenesis was also monitored using PCA based on changes in plasma concentrations of sex steroid and lipid content. The observed oocyte polarization index (PI, a measure of nuclear migration) was correlated with changes in plasma sex steroid levels revealed by FT-IR PCA results. A partial least squares (PLS) model predicted PI values within the range 0.12-0.40 (R = 0.95, SEP = 2.18%) from differences in spectral features. These results suggest that FT-IR may be a good tool for assessing ovarian maturity in farmed sturgeon and will reduce the need for the invasive ovarian biopsy required for PI determination.

  13. Characterization of serum and mucosal antibody responses in white sturgeon (Acipenser transmontanus Richardson) following immunization with WSIV and a protein hapten antigen.

    Science.gov (United States)

    Drennan, John D; Lapatra, Scott E; Swan, Christine M; Ireland, Sue; Cain, Kenneth D

    2007-09-01

    Serum and cutaneous mucus antibodies were monitored in white sturgeon for 15 weeks following intraperitoneal immunization. Ten fish were immunized (50 microg) with white sturgeon iridovirus (WSIV) or white sturgeon gonad (WSGO) tissue culture cells emulsified with or without FCA. An additional group was immunized with FITC:KLH+FCA. Fish were booster immunized at 6 weeks. Fish immunized with FITC:KLH+FCA produced significant serum antibodies to FITC by 6 weeks and this response peaked at 12 weeks (average titer 31,000). Mucosal antibodies to FITC were first detected at 12 weeks and significantly elevated by 15 weeks (average titer 18). Anti-WSIV antibody titers were detected in the serum by 9 weeks in fish immunized with WSIV and WSIV+FCA, but only a small number responded to immunization. At 15 weeks, four fish immunized with WSIV produced serum antibodies (average titer 838) and one fish immunized with WSIV+FCA had a serum titer of 1600. Mucosal anti-WSIV antibody titers of 8 and 16 were observed in two fish from the WSIV group at 12 weeks while four different fish from this group responded at 15 weeks (average titer 4). Western Blot using a monoclonal antibody confirmed immunoglobulin in mucus, and specificity to WSIV was further demonstrated by immunocytochemistry using serum from fish immunized with WSIV. Specific antibody was not detected in mucus of fish immunized with WSIV+FCA, WSGO, or WSGO+FCA. Collectively, these experiments demonstrate that white sturgeon can generate a specific antibody response following immunization, and is the first report showing mucosal immunoglobulin is present in this species.

  14. Evidence of autumn spawning in Suwannee River Gulf sturgeon, Acipenser oxyrinchus desotoi (Vladykov, 1955)

    Science.gov (United States)

    Randall, M.T.; Sulak, K.J.

    2012-01-01

    Evidence of autumn spawning of Gulf sturgeon Acipenser oxyrinchus desotoi in the Suwannee River, Florida, was compiled from multiple investigations between 1986 and 2008. Gulf sturgeon are known from egg collections to spawn in the springtime months following immigration into rivers. Evidence of autumn spawning includes multiple captures of sturgeon in September through early November that were ripe (late-development ova; motile sperm) or exhibited just-spawned characteristics, telemetry of fish that made >175 river kilometer upstream excursions to the spawning grounds in September–October, and the capture of a 9.3 cm TL age-0 Gulf sturgeon on 29 November 2000 (which would have been spawned in late September 2000). Analysis of age-at-length data indicates that ca. 20% of the Suwannee River Gulf sturgeon population may be attributable to autumn spawning. However, with the very low sampling effort expended, eggs or early life stages have not yet been captured in the autumn, which would be the conclusive proof of autumn spawning. More sampling, and sampling at previously unknown sites frequented by acoustic telemetry fish, would be required to find eggs.

  15. 78 FR 59051 - Endangered and Threatened Wildlife and Plants; Recovery Permit Applications

    Science.gov (United States)

    2013-09-25

    ... (Cyprinodon macularius), green sea turtle (Chelonia mydas), and white sturgeon (Acipenser transmontanus) for... requests a permit to take (harass by survey) pallid sturgeon (Scaphirhynchus albus), white...

  16. Structural characteristics and development of ampullary organs in Acipenser naccarii.

    Science.gov (United States)

    Camacho, Susana; Ostos, Maria Del Valle; Llorente, José Ignacio; Sanz, Ana; García, Manuel; Domezain, Alberto; Carmona, Ramón

    2007-09-01

    Ampullary organs of Acipenser naccarii sturgeons were examined by optical and electronic microscopy (transmission electron microscopy and scanning electron microscopy) from hatching until 1 month later when the juvenile phase is completely established. It was observed that, when A. naccarii begins to feed actively, the ultrastructural characteristics of ampullary organs already correspond to those of adult animals. These organs may, therefore, be functional and, together with taste buds, facilitate food search after exhaustion of yolk sac food reserves. Mature ampullary organs of A. naccarii are formed by an ampulla that communicates with the exterior by means of a short channel. These ampullae correspond to the sensory portion of these receptors and are formed by two cell types: receptor cells and support cells. Receptor cells present a kinocilium on their free surface and establish ribbon synapses with axon nerve endings that arise from the underlying conjunctive tissue. Support cells enclose receptor cells, bear stereocilia and occasional cilia, and are of a secretory nature. The mucus associated with ampullary organs mainly comprises neutral mucopolysaccharides, whereas mucopolysaccharides are usually acid in other fish groups.

  17. Population status of North American green sturgeon, Acipenser medirostris

    Science.gov (United States)

    Adams, P.B.; Grimes, C.; Hightower, J.E.; Lindley, S.T.; Moser, M.L.; Parsley, M.J.

    2007-01-01

    North American green sturgeon, Acipenser medirostris, was petitioned for listing under the Endangered Species Act (ESA). The two questions that need to be answered when considering an ESA listing are; (1) Is the entity a species under the ESA and if so (2) is the "species" in danger of extinction or likely to become an endangered species in the foreseeable future throughout all or a significant portion of its range? Green sturgeon genetic analyses showed strong differentiation between northern and southern populations, and therefore, the species was divided into Northern and Southern Distinct Population Segments (DPSs). The Northern DPS includes populations in the Rogue, Klamath-Trinity, and Eel rivers, while the Southern DPS only includes a single population in the Sacramento River. The principal risk factors for green sturgeon include loss of spawning habitat, harvest, and entrainment. The Northern DPS is not considered to be in danger of extinction or likely to become an endangered species in the foreseeable future. The loss of spawning habitat is not large enough to threaten this DPS, although the Eel River has been severely impacted by sedimentation due to poor land use practices and floods. The two main spawning populations in the Rogue and Klamath-Trinity rivers occupy separate basins reducing the potential for loss of the DPS through catastrophic events. Harvest has been substantially reduced and green sturgeon in this DPS do not face substantial entrainment loss. However there are significant concerns due to lack of information, flow and temperature issues, and habitat degradation. The Southern DPS is considered likely to become an endangered species in the foreseeable future. Green sturgeon in this DPS are concentrated into one spawning area outside of their natural habitat in the Sacramento River, making them vulnerable to catastrophic extinction. Green sturgeon spawning areas have been lost from the area above Shasta Dam on the Sacramento River and

  18. Discovery and identification of candidate sex-related genes based on transcriptome sequencing of Russian sturgeon (Acipenser gueldenstaedtii) gonads.

    Science.gov (United States)

    Chen, Yadong; Xia, Yongtao; Shao, Changwei; Han, Lei; Chen, Xuejie; Yu, Mengjun; Sha, Zhenxia

    2016-07-01

    As the Russian sturgeon (Acipenser gueldenstaedtii) is an important food and is the main source of caviar, it is necessary to discover the genes associated with its sex differentiation. However, the complicated life and maturity cycles of the Russian sturgeon restrict the accurate identification of sex in early development. To generate a first look at specific sex-related genes, we sequenced the transcriptome of gonads in different development stages (1, 2, and 5 yr old stages) with next-generation RNA sequencing. We generated >60 million raw reads, and the filtered reads were assembled into 263,341 contigs, which produced 38,505 unigenes. Genes involved in signal transduction mechanisms were the most abundant, suggesting that development of sturgeon gonads is under control of signal transduction mechanisms. Differentially expressed gene analysis suggests that more genes for protein synthesis, cytochrome c oxidase subunits, and ribosomal proteins were expressed in female gonads than in male. Meanwhile, male gonads expressed more transposable element transposase, reverse transcriptase, and transposase-related genes than female. In total, 342, 782, and 7,845 genes were detected in intersex, male, and female transcriptomes, respectively. The female gonad expressed more genes than the male gonad, and more genes were involved in female gonadal development. Genes (sox9, foxl2) are differentially expressed in different sexes and may be important sex-related genes in Russian sturgeon. Sox9 genes are responsible for the development of male gonads and foxl2 for female gonads.

  19. Biomarker responses in persian sturgeon (Acipenser persicus exposed to benzo-a-pyrene and beta-naphthoflavone

    Directory of Open Access Journals (Sweden)

    Karimzadeh Katayoon

    2013-01-01

    Full Text Available Biotransformation enzymes of xenobiotics (ethoxyresorufin-O-deethylase, cytochrome P4501A1 content and glutathione-S-transferase were investigated in the liver of Persian Sturgeon (Acipenser persicus after a 96-hour exposure to polycyclic aromatic hydrocarbons (PAHs, premutagenic benzo[a]pyrene (BaP and beta-naphthoflavone (BNF. The fish were injected 10 mg/kg wet-body weight in corn oil for 96 hours every days. Ethoxyresorufin-O-deethylase activity (EROD and glutathione s-transferase activity (GST were measured in the fish liver. Cytochrome P4501A1 (CYP1A1 content was estimated by indirect enzyme-linked immunosorbent assay (ELISA. The response appeared as early as 12 hours post exposure. A time-dependent response was observed in the EROD activity, being significantly higher at 48 hours post exposure to 10 mg/kg of BaP. The greatest induction occurred in the fish treated with 10 mg/kg BaP, in which a 32.1- fold increase in EROD activity was observed. Results showed that EROD activity in A. persicus is significantly increased by BaP and BNF treatments. Both chemicals showed higher values of EROD activity compared to the liver CYP1A content. There was a rise in glutathione-S-transferase activity in fish exposed to BNF, but no increase was observed in fish treated with BaP. The results showed that hepatic CYP1A expression in terms of induction of EROD activity might be suited as a biomarker of organic contamination in aquatic environments and led to lower sensitivity of the second phase in the detoxification enzyme.

  20. In vitro selection and characterization of putative probiotics isolated from the gut of Acipenser baerii (Brandt, 1869)

    NARCIS (Netherlands)

    Geraylou, Z.; Vanhove, M.P.M.; Souffreau, C.; Rurangwa, E.; Buyse, J.; Ollevier, F.

    2014-01-01

    To select and characterize potential probiotic bacteria from the gut microbiota of Siberian sturgeon (Acipenser baerii), 129 strains isolated from the hindgut were screened for antagonistic activity against five fish pathogens. Ten isolates showed antagonism towards three or more pathogens. Nine of

  1. Microstructure Changes in the Gill Epithelia of Second Filial Acipenser sinensis Juvenile Acclimated to Various Salinities for Different Time%不同盐度和驯养时间中华鲟子二代幼鱼鳃的显微结构变化

    Institute of Scientific and Technical Information of China (English)

    刘娟娟; 王京树; 赵繤; 杨元金

    2015-01-01

    Acipenser sinensis,a typical migratory fish,can acclimate to the very different osmotic environments of fresh water and seawater.The gills play an important role in osmotic and ionic regulation.Morphological and physi-ological changes in the organs that respond to osmotic pressure changes of Acipenseridae under different salinities have been reported and include Russian sturgeon (Acipenser gueldenstaedti),lake sturgeon (Acipenser fulvescens), white sturgeon (Acipenser transmontanus)and Amur sturgeon (Acipenser schrenckii).However,only a few studies have examined the physiological changes of the first filial generation of Acipenser sinensis during seawater acclimation and no relevant research on the second filial generation.Microstructure modifications in the chloride cells of the gill epithelia of juvenile second filial Chinese sturgeon acclimated under different salinities and different time periods were examined by light microscopy and histological photomicrography.Twenty second filial Chinese sturgeon juven-iles with mean full length of 50.7 cm and mean body weight of 441 .9 g were used in the investigation.The test fish were divided into 3 groups and assigned to three circular fiberglass tanks with salinities of 0,10 and 15 g/kg,One juvenile Chinese sturgeon was selected to sample the second gill arch at times of 1,3,6,9,12,24,48,72,96, 120,144,168,192,216,240 and 264 h for the 10 g/kg salinity group and at 24,48 and 72 h for salinity 15 g/kg salinity group.The microstructure of the gill as well as the distribution and structural changes in chloride cells were examined after treatment.Results show that the gill filaments were developed with plump cells in the freshwater group and the gill lamella became wider and longer.A few chloride cells of elliptical shape were ob-served on the base of lamella.In contrast to the freshwater group,gill filaments were narrower in the 10 g/kg salin-ity group.Moreover,there was a little increase in the number and size of

  2. Early

    Directory of Open Access Journals (Sweden)

    Kamel Abd Elaziz Mohamed

    2014-04-01

    Conclusion: Early PDT is recommended for patients who require prolonged tracheal intubation in the ICU as outcomes like the duration of mechanical ventilation length of ICU stay and hospital stay were significantly shorter in early tracheostomy.

  3. Anatomy and early development of the pectoral girdle, fin, and fin spine of sturgeons (Actinopterygii: Acipenseridae).

    Science.gov (United States)

    Dillman, Casey B; Hilton, Eric J

    2015-03-01

    Acipenseriformes hold an important place in the evolutionary history of bony fishes. Given their phylogenetic position as extant basal Actinopterygii, it is generally held that a thorough understanding of their morphology will greatly contribute to the knowledge of the evolutionary history and the origin of diversity for the major osteichthyan clades. To this end, we examined comparative developmental series from the pectoral girdle in Acipenser fulvescens, A. medirostris, A. transmontanus, and Scaphirhynchus albus to document, describe, and compare ontogenetic and allometric differences in the pectoral girdle. We find, not surprisingly, broad congruence between taxa in the basic pattern of development of the dermal and chondral elements of the pectoral girdle. However, we also find clear differences in the details of structure and development among the species examined in the dermal elements, including the clavicle, cleithrum, supracleithrum, posttemporal, and pectoral-fin spine. We also find differences in the internal fin elements such as the distal radials as well as in the number of fin rays and their association with the propterygium. Further, there are clear ontogenetic differences during development of the dermal and chondral elements in these species and allometric variation in the pectoral-fin spine. The characters highlighted provide a suite of elements for further examination in studies of the phylogeny of sturgeons. Determining the distribution of these characters in other sturgeons may aid in further resolution of phylogenetic relationships, and these data highlight the role that ontogenetic and comparative developmental studies provide in systematics.

  4. Surgical removal of cataracts due to Diplostomum species in Gulf sturgeon (Acipenser oxyrinchus desotoi).

    Science.gov (United States)

    Bakal, Robert S; Hickson, Brian H; Gilger, Brian C; Levy, Michael G; Flowers, James R; Khoo, Lester

    2005-09-01

    Twenty 6-yr-old (1995-yr-class) Gulf of Mexico sturgeon (Acipenser oxyrinchus desotoi) were diagnosed as having bilateral cataracts. Histopathologic assessment of the lenses of two of the fish revealed the presence of a diplostomid trematode. Pharmacological treatment of the trematodes may be effective for killing the parasites, but the damage to the lenses and resulting cataracts are nonreversible. Because these animals were to be used in a subsequent study as sentinels in the natural environment, it was necessary to return the animals' vision to as close to normal as possible. Electroretinograms were performed on each fish's eyes to ensure that retinal function was present. Cataracts then were surgically removed by phacoemulsification and aspiration. The animals tolerated the surgical procedures well. This report is the first known report of surgical correction of cataracts in sturgeon species. It also is the first known attempt to correct vision problems in fish being returned to the wild.

  5. Status of scientific knowledge, recovery progress, and future research directions for the Gulf Sturgeon, Acipenser oxyrinchus desotoi Vladykov, 1955

    Science.gov (United States)

    Sulak, Kenneth J.; Parauka, F; Slack, W. Todd; Ruth, T; Randall, Michael; Luke, K; Mette, M. F; Price, M. E

    2016-01-01

    The Gulf Sturgeon, Acipenser oxyrinchus desotoi, is an anadromous species of Acipenseridae and native to North America. It currently inhabits and spawns in the upper reaches of seven natal rivers along the northern coast of the Gulf of Mexico from the Suwannee River, Florida, to the Pearl River, Louisiana, during spring to autumn. Next to the Alligator Gar (Atractosteus spatula), the Gulf Sturgeon is currently the largest fish species occurring in U.S. Gulf Coast rivers, attaining a length of 2.35 m and weights exceeding 135 kg, but historically attained a substantially larger size. Historically, the spawning populations existed in additional rivers from which the species has been wholly or nearly extirpated, such as the Mobile and Ochlockonee rivers, and possibly the Rio Grande River. Most Gulf Sturgeon populations were decimated by unrestricted commercial fishing between 1895–1910. Subsequently most populations remained unrecovered or extirpated due to continued harvest until the 1970s–1980s, and the construction of dams blocking access to ancestral upriver spawning grounds. Late 20th Century harvest bans and net bans enacted by the several Gulf Coast states have stabilized several populations and enabled the Suwannee River population to rebound substantially and naturally. Hatchery supplementation has not been necessary in this regard to date. Sturgeon are resilient and adaptable fishes with a geological history of 150 million years. Research undertaken since the 1970s has addressed many aspects of Gulf Sturgeon life history, reproduction, migration, population biology, habitat requirements, and other aspects of species biology. However, many knowledge gaps remain, prominently including the life history of early developmental stages in the first year of life. Natural population recovery is evident for the Suwannee River population, but seems promising as well for at least four other populations. The Pascagoula and Pearl River populations face a challenging

  6. White Sturgeon Bibliography, 1985 Final Report.

    Energy Technology Data Exchange (ETDEWEB)

    Fickeisen, Duane H. (Pacific Northwest National Laboratory, Richland, WA)

    1986-03-01

    This bibliography presents citations to the majority of published materials on white sturgeon (Acipenser transmontanus). The purpose was to assist in planning and implementing research on white sturgeon in the Columbia River system. (ACR)

  7. Endoscopic sex determination and gonadal manipulation in Gulf of Mexico sturgeon (Acipenser oxyrinchus desotoi).

    Science.gov (United States)

    Hernandez-Divers, Stephen J; Bakal, Robert S; Hickson, Brian H; Rawlings, Clarence A; Wilson, Heather G; Radlinsky, MaryAnn; Hernandez-Divers, Sonia M; Dover, Samuel R

    2004-12-01

    Seventeen Gulf of Mexico sturgeons (Acipenser oxyrinchus desotoi) underwent endoscopic sex determination, gonadal biopsy, and various reproductive surgeries as part of a conservation development plan. The fish were anesthetized with tricaine methanesulfonate (MS-222) buffered with sodium bicarbonate and maintained on a recirculating water anesthesia circuit. A 6-mm Ternamian EndoTip Cannula, placed through the ventral midline, midway between pectoral and pelvic fins, permitted the introduction of a 5-mm telescope. Swim bladder aspiration and CO2 insufflation of the coelomic cavity provided excellent observation. Second and third cannulae were placed under direct visual control, lateral and cranial or caudal to the telescope cannula. Sex determination was successfully performed in all fish; however, five of 17 sturgeons (29%) required endoscopic gonadal biopsy to confirm sex. Bilateral ovariectomy or orchidectomy was successfully performed in three males and four females. Unilateral ovariectomy and bilateral ligation of the müllerian ducts using an extracorporeal suturing technique was accomplished in an additional three females. No apparent morbidity was associated with the anesthesia or endoscopic surgery in any fish. The ability to safely perform minimally invasive reproductive surgery in fish may have important management and conservation benefits.

  8. Unscreened water-diversion pipes pose an entrainment risk to the threatened green sturgeon, Acipenser medirostris.

    Directory of Open Access Journals (Sweden)

    Timothy D Mussen

    Full Text Available Over 3,300 unscreened agricultural water diversion pipes line the levees and riverbanks of the Sacramento River (California watershed, where the threatened Southern Distinct Population Segment of green sturgeon, Acipenser medirostris, spawn. The number of sturgeon drawn into (entrained and killed by these pipes is greatly unknown. We examined avoidance behaviors and entrainment susceptibility of juvenile green sturgeon (35±0.6 cm mean fork length to entrainment in a large (>500-kl outdoor flume with a 0.46-m-diameter water-diversion pipe. Fish entrainment was generally high (range: 26-61%, likely due to a lack of avoidance behavior prior to entering inescapable inflow conditions. We estimated that up to 52% of green sturgeon could be entrained after passing within 1.5 m of an active water-diversion pipe three times. These data suggest that green sturgeon are vulnerable to unscreened water-diversion pipes, and that additional research is needed to determine the potential impacts of entrainment mortality on declining sturgeon populations. Data under various hydraulic conditions also suggest that entrainment-related mortality could be decreased by extracting water at lower diversion rates over longer periods of time, balancing agricultural needs with green sturgeon conservation.

  9. Unscreened water-diversion pipes pose an entrainment risk to the threatened green sturgeon, Acipenser medirostris.

    Science.gov (United States)

    Mussen, Timothy D; Cocherell, Dennis; Poletto, Jamilynn B; Reardon, Jon S; Hockett, Zachary; Ercan, Ali; Bandeh, Hossein; Kavvas, M Levent; Cech, Joseph J; Fangue, Nann A

    2014-01-01

    Over 3,300 unscreened agricultural water diversion pipes line the levees and riverbanks of the Sacramento River (California) watershed, where the threatened Southern Distinct Population Segment of green sturgeon, Acipenser medirostris, spawn. The number of sturgeon drawn into (entrained) and killed by these pipes is greatly unknown. We examined avoidance behaviors and entrainment susceptibility of juvenile green sturgeon (35±0.6 cm mean fork length) to entrainment in a large (>500-kl) outdoor flume with a 0.46-m-diameter water-diversion pipe. Fish entrainment was generally high (range: 26-61%), likely due to a lack of avoidance behavior prior to entering inescapable inflow conditions. We estimated that up to 52% of green sturgeon could be entrained after passing within 1.5 m of an active water-diversion pipe three times. These data suggest that green sturgeon are vulnerable to unscreened water-diversion pipes, and that additional research is needed to determine the potential impacts of entrainment mortality on declining sturgeon populations. Data under various hydraulic conditions also suggest that entrainment-related mortality could be decreased by extracting water at lower diversion rates over longer periods of time, balancing agricultural needs with green sturgeon conservation.

  10. Reduction of vitellogenin synthesis by an aryl hydrocarbon receptor agonist in the white sturgeon (Acipenser transmontamus).

    Science.gov (United States)

    Palumbo, Amanda J; Denison, Michael S; Doroshov, Serge I; Tjeerdema, Ronald S

    2009-08-01

    Migrating white sturgeon (Acipenser transmontamus) may be subject to agricultural, municipal, and industrial wastewater effluents that likely contain different classes of endocrine-disrupting contaminants. Concern is mounting about the negative effects of environmental estrogens on fish reproduction; however, in environmental mixtures, the affects from estrogenic compounds may be suppressed by aryl hydrocarbon receptor (AhR) ligands. Indeed, reductions in 17beta-estradiol-induced (0.01 and 1 mg/kg) vitellogenin (VTG) levels were observed in white sturgeon coinjected with beta-naphthoflavone (BNF; 50 mg/kg), a model for contaminants that activate the AhR. Variation in the time of injection was used to attempt to correlate VTG inhibition to ethoxyresorufin-O-deethylase activity. No evidence was found to suggest that the inhibition of VTG is a direct result of enhanced estrogen metabolism by BNF-induced enzymes. Results of the present study are relevant for monitoring programs that measure VTG, because these results show that AhR-active environmental contaminants can repress VTG synthesis, which commonly is used as an indicator of estrogen-mimicking contaminants. Furthermore, suppression of natural estrogen signaling by AhR agonists may have significant effects on fish reproduction.

  11. Effects of pre-incubation of eggs in fresh water and varying sperm concentration on fertilization rate in sterlet sturgeon, Acipenser ruthenus

    DEFF Research Database (Denmark)

    Siddique, Mohammad Abdul Momin; Butts, Ian; Psěnička, Martin

    2015-01-01

    Standardization of fertilization protocols for sterlet Acipenser ruthenus is crucial for improving reproductive techniques and for conservation purposes. Our objectives were to determine the number of sperm (tested 430,000:1, 43,000:1, 4300:1, 430:1 sperm to egg) required to fertilize eggs...

  12. Effect of nutritional status on the osmoregulation of green sturgeon (Acipenser medirostris).

    Science.gov (United States)

    Haller, Liran Y; Hung, Silas S O; Lee, Seunghyung; Fadel, James G; Lee, Jun-Ho; McEnroe, Maryann; Fangue, Nann A

    2015-01-01

    Anthropogenic climate change is linked to food web and salinity fluctuations in estuarine environments. Both decreased nutritional status and environmental salinity influence the physiological tolerance and health of fish populations; however, limited information on the interaction of these two factors and their physiological consequences is available. The green sturgeon (Acipenser medirostris) is a species of special concern in California, and the southern distinct population segment is listed as threatened. To test the hypothesis that poor nutrition negatively affects osmoregulation, juvenile green sturgeon (222 d posthatch) were randomly assigned to four feed restriction groups (12.5%, 25%, 50%, and 100% of the optimal feeding rate for 4 wk). Fish were then acutely exposed to 0-, 8-, 16-, or 32-ppt salinities and sampled at three time points (12, 72, or 120 h). Feed restriction significantly (P lipids, and protein content as well as plasma glucose, triglycerides, and proteins. Furthermore, feed restriction, salinity concentration, and salinity exposure time had significant effects on hematological indexes (hematocrit, hemoglobin), plasma values (osmolality, Na(+), K(+), Cl(-), glucose, lactate, cortisol), enzymatic activity (gill and pyloric ceca Na(+)/K(+) ATPase), and morphology of gill mitochondria-rich cells. The largest disturbances were observed at the highest salinity treatments across all feeding regimes. In addition, the interaction between feed restriction and acute salinity exposure at the highest salinity treatment resulted in high mortality rates during the first 72 h of salinity exposure. Evaluating the interactions of these environmental stressors and their implications on green sturgeon physiological tolerance will inform restoration and management efforts in rapidly changing estuarine environments.

  13. PERMEABILITY OF STERLET SPERM MEMBRANES (ACIPENSER RUTHENUS L., 1758 FOR WATER MOLECULES

    Directory of Open Access Journals (Sweden)

    A. Puhovkin

    2016-03-01

    Full Text Available Purpose. The literature analysis of the results cryopreservation of different fish species highlights a variation of many parameters, in particular the sperm survival rate during the freezing and unfreezing process. The survival capability of spermatozoa may be called the main parameter, which indentifies the efficiency of the entire process of low temperature freezing of reproductive products. Therefore, the goal of this work was to investigate and find the causes of different degrees of fish sperm cryoimmunity, in particular that of starlet, which is a valuable of sturgeon (Acipenser species. We also studies the possibility to find the optimum ways to improve the efficiency of the survival rate of the defrosted spermatozoa of different fish species for their further use to produce viable offspring. Methodology. The determination of sterlet sperm membrane permeability was performed after carrying out all necessary manipulations with brood males which included: prespawning incubation, hormonal stimulation, determination of sperm maturity degree, obtaining the sperm by stripping. The measurement of sperm membrane permeability for water molecules was performed based on the technique, which had been used earlier to measure carp sperm permeability, but taking account the specific peculiarities inherent to sterlet sperm. Findings. Based on the performed measurements, we determined the sterlet sperm membrane permeability for water molecules with the use of photometric method. The received experimental data show the highest degree of sterlet sperm membrane permeability for water molecules as compared to carp sperm membrane permeability. Originality. As a result of this experiment, we determined for the first time the absolute value of sterlet sperm membrane permeability for water molecules with the use of photometric method as well as compared the results with those obtained during our work with the carp sperm. Practical value. The data obtained during

  14. Size determination of Acipenser ruthenus spermatozoa in different types of electron microscopy.

    Science.gov (United States)

    Psenicka, Martin; Tesarová, Martina; Tesitel, Jakub; Nebesárová, Jana

    2010-07-01

    In this study three types of scanning electron microscopes were used for the size determination of spermatozoa of sterlet Acipenser ruthenus - high vacuum scanning electron microscope (SEM, JEOL 6300), environmental scanning electron microscope (ESEM, Quanta 200 FEG), field emission scanning electron microscope (FESEM, JEOL 7401F) with cryoattachment Alto 2500 (Gatan) and transmission electron microscope (TEM, JEOL 1010). The use of particular microscopes was tied with different specimen preparation techniques. The aim of this study was to evaluate to what degree the type of used electron microscope can influence the size of different parts of spermatozoa. For high vacuum SEM the specimen was prepared using two slightly different procedures. After chemical fixation with 2.5% glutaraldehyde in 0.1M phosphate buffer and post-fixation by 1% osmium tetroxide, the specimen was dehydrated by acetone series and dried either by critical point method or by means of t-butylalcohol. For ESEM fresh, unfixed material was used, which was dropped on microscopic copper grids. In FESEM working in cryo-mode the specimen was observed in a frozen state. Ultrathin sections from chemically fixed and Epon embedded specimens were prepared for TEM observation. Distinct parts of sterlet spermatozoa were measured in each microscope and the data obtained was statistically processed. Results confirmed that the classical chemical procedure of specimen preparation for SEM including critical point drying method led to a significant contraction of all measured values, which could deviate up to 30% in comparison with values measured on the fresh chemically untreated specimen in ESEM. Surprisingly sperm dimensions determinated on ultrathin sections by TEM are comparable with values obtained in ESEM or FESEM.

  15. Microsatellites variation in sterlet sturgeon, Acipenser ruthenus from the Lower Danube

    Directory of Open Access Journals (Sweden)

    Andreea Dudu

    2013-05-01

    Full Text Available Sturgeons represent an ancient group of fish with an important scientific and commercial value. The economical significance of these species is due to their meat and roes that are considered to be a gastronomic delicacy. Unfortunately, precisely due to their economical value the sturgeons have been overexploited by fishing and poaching and nowadays are facing extinction. Currently, in the Ponto-Caspian region is found the greatest diversity of acipenserid species and the Lower Danube is the last refuge for the sturgeons from the Black Sea. Acipenser ruthenus (sterlet is a fresh water sturgeon species which has undergone a large population decline, but local populations are still surviving in most parts of the rivers draining to Black, Azov and Caspian Seas. In order to have successful conservation programs of this species is essential to evaluate its genetic diversity. Microsatellites represent valuable markers for genetic analyses aiming the assessment of genetic variability of population. In our study we analyzed the cross-amplification and the polymorphism in A. ruthenus population from the Lower Danube of seven microsatellite loci (LS-19, LS-34, LS-54, LS-57, LS-68, Aox23 and Aox45, originally isolated in North-American sturgeon species. Among the seven loci, three (LS57, Aox23 and Aox45 have showed a tetrasomic profile. The most polymorphic loci were LS-57 with 12 alleles in population, followed by Aox23 and Aox45 with 11 alleles and LS-68 with 10 alleles. Four loci (LS-19, LS-34 and LS-54 presented a lower level of polymorphism, only three alleles being identified for the analyzed individuals.

  16. Optimization of enzyme-assisted extraction and characterization of collagen from Chinese sturgeon (Acipenser sturio Linnaeus skin

    Directory of Open Access Journals (Sweden)

    Weiwei Feng

    2013-01-01

    Full Text Available Background: Sturgeon (Acipenser sturio Linnaeus skin contains high amount of nutrients including unsaturated fatty acids and collagen. A pepsin-assisted extraction procedure was developed and optimized for the extraction of collagen from Chinese sturgeon (Acipenser sturio Linnaeus skins. Objective: To determine the optimum conditions with the maximum yield of the pepsin-soluble collagen (PSC extraction. Materials and Methods: The conditions of the extraction were optimized using response surface methodology. The Box-Behnken design was used to evaluate the effects of the three independent variables (extraction time, enzyme concentration, and solid-liquid ratio on the PSC yield of the sturgeon skin. Results: The optimal conditions were: solid-liquid ratio of 1:11.88, enzyme concentration of 2.42%, and extraction time of 6.45 h. The maximum yield of 86.69% of PSC was obtained under the optimal conditions. This value was not significantly different from the predicted value (87.4% of the RSM (P < 0.05. Conclusion: The results of this study indicated that the production of PSC from sturgeon skin is feasible and beneficial. The patterns of sodium dodecyl sulfate-polyacrylamide gel electrophoretic patterns (SDS-PAGE indicated that the sturgeon skin contains type I collagen, which is made of α-chain and β-chain. The infrared spectra of the collagens also indicated that pepsin hydrolysis does not affect the secondary structure of collagen, especially triple-helical structure.

  17. Morphofunctional Adaption of the Renal Tissue of Acipenser Ruthenus (Actinopterygii, Acipenseriformes under Transformed Habitation Conditions

    Directory of Open Access Journals (Sweden)

    Koziy M. S.

    2014-08-01

    Full Text Available Светооптическим мето- дом изучено морфофункциональное состояние мезонефроса стерляди (Acipenser ruthenus Linnaeus, 1758 из низовьев р. Днепр. Отмечены адаптивные изменения в структурно-функциональных элементах нефронов туловищной почки. К наиболее ощутимым сдвигам можно отнести очаговые кровоизлияния в ретикуломиелоидной ткани, отёчность эпителия и воспалительные процессы. Отмеченные нарушения являются ответной реакцией на негативные воздействия компонентов сточных вод.

  18. Biology and Resources Status of Amur Sturgeon(Acipenser schrenckii)%施氏鲟 Acipenser schrenckii 的生物学特性及资源状况

    Institute of Scientific and Technical Information of China (English)

    李雷; 马波

    2016-01-01

    鲟类约有2亿年的历史,是现存脊椎动物中起源最早的生物类群之一,具有独特的生物学特性。近年来受水电工程建设、过度捕捞及环境污染的影响,鲟类的自然资源量日益枯竭,70%的种类被世界自然保护联盟( IU C N)列为濒危乃至极危物种。本文综述施氏鲟 Acipenser schrenckii 的生物学特性和资源状况,阐述施氏鲟的分布、地理种群、形态特征、食性、年龄与生长、繁殖、洄游、资源现状及其下降的原因,以期为施氏鲟资源的合理利用及我国珍稀濒危鲟类的保护提供参考。%The sturgeons, as the earliest existing vertebrates, about 200 million years of history, have formed unique biological charac-teristics. In recent years, the varieties of 70% sturgeons are listed as endangered species or critically endangered species by International Union for Conservation of Nature ( IUCN), as the natural resources of the sturgeons have been significantly declined with hydroelec-tricity project, overfishing and environmental pollution. In this article, biological properties and resources of Amur sturgeon( Acipenser schrenckii) are summarized, including distribution, geographic population, morphological characteristics, feeding habit, age and growth, reproduction, migration, resource status and the cause of the stock decline, in order to provide reference with both rational use of Amur sturgeon and development of sturgeon protection theory.

  19. Habitat used by juvenile lake sturgeon (Acipenser fulvescens) in the North Channel of the St. Clair River (Michigan, USA)

    Science.gov (United States)

    Boase, James C.; Manny, Bruce A.; Donald, Katherine A.L.; Kennedy, Gregory W.; Diana, James S.; Thomas, Michael V.; Chiotti, Justin A.

    2014-01-01

    Lake sturgeon (Acipenser fulvescens) occupy the St. Clair River, part of a channel connecting lakes Huron and Erie in the Laurentian Great Lakes. In the North Channel of the St. Clair River, juvenile lake sturgeon (3–7 years old and 582–793 mm in length) were studied to determine movement patterns and habitat usage. Fourteen juveniles were implanted with ultrasonic transmitters and tracked June–August of 2004, 2005 and 2006. Telemetry data, Geographic Information System software, side-scan sonar, video images of the river bottom, scuba diving, and benthic substrate samples were used to determine the extent and composition of habitats they occupied. Juvenile lake sturgeon habitat selection was strongly related to water depth. No fish were found in 700 mm in length selected sand and gravel areas mixed with zebra mussels and areas dominated by zebra mussels, while fish < 700 mm used these habitat types in proportion to their availability.

  20. Effects of acoustic tag implantation on lake sturgeon Acipenser fulvescens: lack of evidence for changes in behavior

    Science.gov (United States)

    Hondorp, Darryl W.; Holbrook, Christopher; Krueger, Charles C.

    2015-01-01

    An assumption of studies using acoustic telemetry is that surgical implantation of acoustic transmitters or tags does not alter behavior of tagged individuals. Evaluating the validity of this assumption can be difficult for large fish, such as adult sturgeons, not amenable to controlled laboratory experimentation. The purpose of this study was to determine if and when this assumption was valid for adult lake sturgeon Acipenser fulvescens tagged with large (34 g) acoustic transmitters and released into the St. Clair River during 2011–2014. The hypothesis that activity and reach-scale distributions of tagged and untagged lake sturgeon did not differ was tested by comparing movement frequencies, movement rates (speed-over-ground), and location-specific detection probabilities between newly-tagged lake sturgeon and presumably fully-recovered conspecifics tagged and released in prior years.

  1. PHYSICO-CHEMICAL LIMITATIVE FACTORS FOR GROWTH AND DEVELOPMENT IN STERLET (ACIPENSER RUTHENUS LINNAEUS, 1758 IN EXTENSIVELY SYSTEM

    Directory of Open Access Journals (Sweden)

    R. C. DIMA

    2013-07-01

    Full Text Available The oldest and most common method of increasing fish is a fish breeding ponds in which the supervision of nutrition and growth of biological material. Sterlet (Acipenser ruthenus ruthenus Linnaeus 1785 is the 4th of sturgeon scale and economic importance as a share of production of these fish .Monitoring of physicochemical parameters of sturgeons ponds has a crucial role to obtain satisfactory yields both in qualitative and quantitative. Chemical characteristics of water were determined in laboratory ecosystems Chemistry of the Institute of Research and Development for Ecology Aquaculture, Fisheries and Aquaculture Galaţi for the samples have been taken of the total water. Determination of the chemical characteristics was performed by standardized methods. Physic-chemical parameters of water were determined according to norm on the classification of surface water quality in order to establish the ecological status of water (Order no. 161/2006, for Class II of quality.

  2. Optimizing the co-feeding strategy of Persian sturgeon (Acipenser persicus larvae using Artemia nauplii and formulated diet

    Directory of Open Access Journals (Sweden)

    Naser Agh

    2013-07-01

    Full Text Available High mortality and labor costs are associated with first-feeding sturgeon culture, particularly during the period of dietary transition from live to formulated feed. Therefore we investigated the effects of various feeding treatments on the survival and growth of the Persian sturgeon (Acipenser persicus larvae during a 20-day culture period. Three replicate groups (250 fish/replicate of first-feeding larvae were fed according to four main feeding regimes: (1 live food (live nauplii of brine shrimp Artemia urmiana; (2 indirect transition (5 days live food followed by gradual transition to formulated diet; (3 direct transition (using different combinations of live and formulated diet from the start feeding onwards; (4 formulated feed (FD from the start feeding. Results indicated that growth and survival were higher in the indirect transition feeding regime than in other regimes. Based on our study, co-feeding of A. persicus should start five days after prior feeding with live food.

  3. Increasing of survival rate to Acipenser persicus by added Clinoptilolite zeolite in acute toxicity test of ammonia

    Directory of Open Access Journals (Sweden)

    Mohammad Farhangi

    2012-03-01

    Full Text Available The experiments were done to increase the survival rate to Acipenser persicus by added Clinoptilolite zeolite in lethal concentration of ammonia. Twelve fishes with average weight 26 ± 3 g were exposed to different concentrations (5, 15, 25, 35 mg L-1 of total ammonia salt. A group of fish was considered as control. Under stable condition, the lethal concentration of total ammonia was 35 mg L-1 during 96 hours. In the lethal concentration of total ammonia different amount of 4, 8, 12 g L-1 Clinoptilolite zeolite were used. Results indicate significant differences between treatments with each other and also control (p-1 concentration of powdered zeolite, the mortality of fish could be prevented after 96 hours. Histopathological findings showed that major lesion were hemorrhage, hyperemia, hyperplasia and epithelial cells necrosis. Also observed was degenerated tubules of kidney, expansion of Bowman’s capsule and hepatocytes necrosis by observations.

  4. Effects of feeding, digestion and fasting on the respiration and swimming capability of juvenile sterlet sturgeon (Acipenser ruthenus, Linnaeus 1758).

    Science.gov (United States)

    Cai, Lu; Johnson, David; Fang, Min; Mandal, Prashant; Tu, Zhiying; Huang, Yingping

    2017-02-01

    The objective of this study is to provide information on changes in swimming capability and respiration of the sterlet sturgeon (Acipenser ruthenus, Linnaeus 1758) caused by different levels of fasting. Before testing, the four groups of sturgeon (body length: 12.1-15.4 cm, body mass: 10.0-20.2 g) fasted for 6 h, 2 days, 1 and 2 weeks, respectively. Swimming tests were then performed to measure critical swimming speed and oxygen consumption at 20 ± 0.5 °C. Results show: (1) Fasting times shorter than 2 days has little effect on swimming capability, but it decreases significantly when the fasting time is longer than a week. (2) After 2 weeks of fasting, swimming efficiency is significantly reduced. (3) Anaerobic capacity increases when digestion nears completion.

  5. Recuperación de Acipenser sturio L., 1758 en Alemania: características del crecimiento de los peces juveniles mantenidos en condiciones experimentales de interior

    OpenAIRE

    Kirschbaum, F.; Gessner, J.; Williot, P.

    2001-01-01

    The survival of the highly endangered Acipenser sturio L., 1758 depends nearly exclusively upon the establishment of captive broodstocks. Such measures were initiated in Germany in 1996, due to a transfer of 40 artificially reproduced individuals from France under a co-operation agreement. We report the results of rearing these fish for a period of 3 years under freshwater conditions. During the first year the fish being exclusively fed frozen chironomid larvae (N = 40) grew from a median of ...

  6. HEAVY METALS IN ORGANS AND TISSUES OF STERLET (ACIPENSER RUTHENUS L. IN THE DNIEPER-BUG ESTUARY

    Directory of Open Access Journals (Sweden)

    Yu. Sytnik

    2016-09-01

    Full Text Available Purpose.To iInvestigate and analyze the peculiarities of the accumulation of heavy metals (Cu, Fe, Zn, Cd, Pb, Co, Ni and Mn in the organs (muscles, gills, liver, kidneys, fins, intestine and tissues of sterlet (Acipenser ruthenus Linnaeus, 1758 for detecting the patterns of their accumulation and predicting the effect of their toxicological load on the organism of sturgeons as well as for evaluating the polymetallic load on this species in the Dnieper-Bug estuary. Methodology. The material for the research was represented by 3+ – 4+ sterlet caught in the spring of 2016 in the Dnieper-Bug estuary. Organs and tissue samples were homogenized and then burned in a mixture of concentrated nitric (HNO3 and hydrochloric acid (HCl. The determination of heavy metals in organs and tissues of fish were performed by flame atomic absorption spectroscopy using an atomic absorption spectrophotometer AAS-3 and AAS-3N company "Carl Zeiss" (Jena, Germany. Findings. The distribution of heavy metals in organs and tissues of sterlet (Acipenser ruthenus L. of the Dnieper-Bug estuary in the spring of 2016 was characterized by heterogeneity and depended on their physico-chemical properties and functional characteristics of organs and tissues of the investigated fish. The highest quantities copper, zinc and iron are accumulated liver, while manganese and cobalt in gills. Toxic metals (lead and cadmium are more concentrated in gills, skin and liver. The maximum contents in the tissues and organs of sterlet were observed for iron and zinc, while the minimals ones — for cadmium and cobalt. Originality. The paper describes the actual data on the contents and peculiarities of heavy metal accumulation in the body of sterlet inhabiting the Dnieper-Bug estuary. Practical value. The paper contains the newest information on the accumulation and content of heavy metals in organs and tissues of sterlet in the Dnieper-Bug estuary. The results of the work will be used for future

  7. Quantitative assessment of benthic food resources for juvenile Gulf sturgeon, Acipenser oxyrinchus desotoi in the Suwannee River estuary, Florida, USA

    Science.gov (United States)

    Brooks, R.A.; Sulak, K.J.

    2005-01-01

    Gulf sturgeon, Acipenser oxyrinchus desotoi, forage extensively in the Suwannee River estuary following emigration out of the Suwannee River, Florida. While in the estuary, juvenile Gulf sturgeon primarily feed on benthic infauna. In June-July 2002 and February-April 2003, random sites within the estuary were sampled for benthic macrofauna (2002 n = 156; 2003 n = 103). A mean abundance of 2,562 ind m-2 (SE ?? 204) was found in the summer, with significantly reduced macrofaunal abundance in the winter (mean density of 1,044 ind m-2, SE ?? 117). Benthic biomass was significantly higher in the summer with an average summer sample dry weight of 5.92 g m-2 (SE ?? 0.82) compared to 3.91 g m-2 (SE ?? 0.67) in the winter. Amphipods and polychaetes were the dominant taxa collected during both sampling periods. Three different estimates of food availability were examined taking into account principal food item information and biomass estimates. All three estimates provided a slightly different view of potential resources but were consistent in indicating that food resource values for juvenile Gulf sturgeon are spatially heterogeneous within the Suwannee River estuary. ?? 2005 Estuarine Research Federation.

  8. Evaluating the function of calcium antagonist on the Cd-induced stress in sperm of Russian sturgeon, Acipenser gueldenstaedtii

    Energy Technology Data Exchange (ETDEWEB)

    Li Zhihua, E-mail: zhihuali06@yahoo.com [University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Zatisi 728/II, 389 25 Vodnany (Czech Republic); Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Jingzhou 434000 (China); Li Ping [University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Zatisi 728/II, 389 25 Vodnany (Czech Republic); Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Jingzhou 434000 (China); Rodina, Marek; Randak, Tomas [University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Zatisi 728/II, 389 25 Vodnany (Czech Republic)

    2010-11-15

    In the current study, the sperm of Russian sturgeon (Acipenser gueldenstaedtii) was used to evaluate the roles of Verapamil (VRP), a calcium channel blocker, against cadmium (Cd)-induced stress. Sturgeon sperm were exposed for 2 h at 50 {mu}g/L VRP, 5.0 {mu}g/L Cd, the mixture of 50 {mu}g/L VRP + 5.0 {mu}g/L Cd, 50 {mu}g/L Cd and the mixture of 50 {mu}g/L VRP + 50 {mu}g/L Cd. After exposure, the sperm motility parameters (motility and velocity), oxidative stress levels (lipid peroxidation [LPO] and carbonyl protein [CP]) and antioxidant enzyme activities (superoxide dismutase [SOD], glutathione reductase [GR], glutathione peroxidase [GPx]) were measured in sturgeon sperm. Compared to the control, Cd-induced stress was apparent as reflected by depressed motility parameters, induced oxidative stress and inhibited antioxidant enzyme activities at both Cd concentrations. In the presence of VRP, Cd-induced stress was reduced in sturgeon sperm, especially all the measured parameters in the sperm exposed at 5.0 {mu}g/L Cd returned to control levels, expect for the sperm motility. The present results indicate that VRP can reduce the Cd-induced stress in sturgeon sperm and suggest that using of sperm in vitro assays may provide a novel and efficient means for evaluating the effects of residual metals in the aquatic environment of sturgeon.

  9. Evaluating the function of calcium antagonist on the Cd-induced stress in sperm of Russian sturgeon, Acipenser gueldenstaedtii.

    Science.gov (United States)

    Li, Zhi-Hua; Li, Ping; Rodina, Marek; Randak, Tomas

    2010-11-15

    In the current study, the sperm of Russian sturgeon (Acipenser gueldenstaedtii) was used to evaluate the roles of Verapamil (VRP), a calcium channel blocker, against cadmium (Cd)-induced stress. Sturgeon sperm were exposed for 2h at 50μg/L VRP, 5.0μg/L Cd, the mixture of 50μg/L VRP+5.0μg/L Cd, 50μg/L Cd and the mixture of 50μg/L VRP+50μg/L Cd. After exposure, the sperm motility parameters (motility and velocity), oxidative stress levels (lipid peroxidation [LPO] and carbonyl protein [CP]) and antioxidant enzyme activities (superoxide dismutase [SOD], glutathione reductase [GR], glutathione peroxidase [GPx]) were measured in sturgeon sperm. Compared to the control, Cd-induced stress was apparent as reflected by depressed motility parameters, induced oxidative stress and inhibited antioxidant enzyme activities at both Cd concentrations. In the presence of VRP, Cd-induced stress was reduced in sturgeon sperm, especially all the measured parameters in the sperm exposed at 5.0μg/L Cd returned to control levels, expect for the sperm motility. The present results indicate that VRP can reduce the Cd-induced stress in sturgeon sperm and suggest that using of sperm in vitro assays may provide a novel and efficient means for evaluating the effects of residual metals in the aquatic environment of sturgeon.

  10. Influence of Glutamine Supplementation on Motility and Fertilization Success of Frozen-Thawed Persian Sturgeon (Acipenser persicus) Sperm.

    Science.gov (United States)

    Aramli, M S; Golshahi, K; Nazari, R M; Golpour, A; Aramli, S

    2016-08-01

    Amino acids have an important biological role for the prevention of cell damage during cryopreservation. The aim of this study was to investigate the effects of glutamine on post-thaw sperm motility and fertilization success in the Persian sturgeon (Acipenser persicus). Sperm collected from six fish was cryopreserved in extenders containing different glutamine concentrations (2.5, 5 and 10 mm). Sperm samples diluted at the ratio of 1 : 1 using the extenders were subjected to cryopreservation. After dilution, the sperm suspensions were sucked into 250-μl straws; the straws were placed on the tray, frozen in nitrogen vapour and plunged into liquid nitrogen. Then, sperm were thawed in a water bath at 40°C for 5 s and used for analysis. Our results revealed that an increase in the concentration of glutamine caused a significant increase in the motility percentage, curvilinear velocity (VCL) and also fertilization success in the Persian sturgeon (p < 0.05). Comparing all concentrations of glutamine, the best concentration for sperm motility and fertilization rate was 10 mm. In addition, higher post-thaw motility percentage, VCL, and fertilization and hatching rates were obtained with the extender at the concentration of 10 mm (p < 0.05). The findings of this study showed that glutamine was of greater benefit to Persian sturgeon sperm motility during frozen-thawed process.

  11. Electronic archival tags provide first glimpse of bathythermal habitat use by free-ranging adult lake sturgeon Acipenser fulvescens

    Science.gov (United States)

    Briggs, Andrew S.; Hondorp, Darryl W.; Quinlan, Henry R.; Boase, James C.; Mohr, Lloyd C.

    2016-01-01

    Information on lake sturgeon (Acipenser fulvescens) depth and thermal habitat use during non-spawning periods is unavailable due to the difficulty of observing lake sturgeon away from shallow water spawning sites. In 2002 and 2003, lake sturgeon captured in commercial trap nets near Sarnia, Ontario were implanted with archival tags and released back into southern Lake Huron. Five of the 40 tagged individuals were recaptured and were at large for 32, 57, 286, 301, and 880 days. Temperatures and depths recorded by archival tags ranged from 0 to 23.5 ºC and 0.1 to 42.4 m, respectively. For the three lake sturgeon that were at large for over 200 days, temperatures occupied emulated seasonal fluctuations. Two of these fish occupied deeper waters during winter than summer while the other occupied similar depths during non-spawning periods. This study provides important insight into depth and thermal habitat use of lake sturgeon throughout the calendar year along with exploring the feasibility of using archival tags to obtain important physical habitat attributes during non-spawning periods.

  12. Hemato-Immunological Responses and Disease Resistance in Siberian Sturgeon Acipenser baerii Fed on a Supplemented Diet of Lactobacillus plantarum.

    Science.gov (United States)

    Pourgholam, Moheb Ali; Khara, Hossein; Safari, Reza; Sadati, Mohammad Ali Yazdani; Aramli, Mohammad Sadegh

    2017-03-01

    A feeding trial was conducted to investigate the effects of different levels of dietary Lactobacillus plantarum on hemato-immunological parameters and resistance against Streptococcus iniae infection in juvenile Siberian sturgeon Acipenser baerii. Fish (14.6 ± 2.3 g) were fed three experimental diets prepared by supplementing a basal diet with L. plantarum at different concentrations [1 × 10(7), 1 × 10(8) and 1 × 10(9) colony-forming units (cfu) g(-1)] and a control (non-supplemented basal) diet for 8 weeks. Innate immune responses (immunoglobulin (Ig), alternative complement activity (ACH50) and lysozyme activity) were significantly higher in fish fed the 1 × 10(8) and 1 × 10(9) cfu g(-1) L. plantarum diet compared to the other groups (P white blood cell (WBC) and monocyte compared to those of the control group (P sturgeon juvenile.

  13. Comparative study of haematological, serum electrolyte and nonelectrolyte parameters of male and female Persian sturgeon (Acipenser persicus) brood stocks

    Institute of Scientific and Technical Information of China (English)

    ADEL Milad; PALANISAMY Satheesh Kumar; SHAFIEI Shafigh; FAZLI Hasan; ZORRIEHZAHRA Mohammad Jalil

    2016-01-01

    Sturgeons are the most important principal market species in the Caspian Sea. In the present study, measurement of blood parameters was carried out with the aim of evaluating the normal value of hematological and serum biochemical parameters of brood stocksAcipenser persicus during spawning season. Blood samples were collected from 36 brood stocks ofA. persicus (18 males and 18 females) during the spawning season. Higher value of red blood cells, white blood cells, haemoglobin, haematocrit was observed in male breeders with significant differences between female breeders (p>0.05). Haemoglobin and haematocrit value in this study was within the range of 8.70 to 9.2 g/dL and 29.73% to 30.26%, respectively. The statistically significant differences between mean corpuscular volumes, mean corpuscular haemoglobin, lymphocyte and neutrophil percentages, aspartate aminotransferase, alkaline phosphatase and creatine kinase were observed in the male and female brood stocks. It is concluded from this study, some of the hematological and serum biochemical parameters of male and female A. persicus breeders were significantly varied from each other. In comparative investigation with earlier reports, the values of red blood cells, haemoglobin and haematocrit are highly varied due to age variations of fish. However, further studies are necessary to understand the impact of sexual, age, size, length, and season and habitat variation. Serum biochemical parameters can be used for confirming the maturity ofA. persicus and monitoring any changes in the water quality parameters and soil.

  14. STUDY ABOUT CORPORAL INDICATORS IN JUVENILE OF RUSSIAN STURGEON (ACIPENSER GÜELDENSTAEDTI RAISED IN RECIRCULATING SYSTEM

    Directory of Open Access Journals (Sweden)

    Z.T. SZELEI

    2013-07-01

    Full Text Available Studies were conducted on a population of Russian sturgeon (Acipenser güeldenstaedti age between 132-175 days, raised in recirculation system. Based on body weight, the population was divided into two categories: 50-100 g and 100-150 g. On the 42 individuals were performed determinations of weight, length, width, height and circumference. It was also determined the number of shields which comprise the five lines of shields, which are endowed with Russian sturgeons. On the basis of weighing and measurements taken have resulted following body indices: the index of profile (height, the index of thickness (width spinal, the fattening index (Fulton index, quality index and the index of fleshiness. At the lot of Russian sturgeons with average body weight of 127.55 ± 3.75 g, body length is 76.27% of total body length, head length is 20.11% of the total length of the body, caudal peduncle length measured 16.39% of total body length and length of snout reaches 45.56% of head length. Index of profile (height has highlighted that juvenile Russian sturgeon has an elongated body and a straight back.

  15. A nuclear DNA perspective on delineating evolutionarily significant lineages in polyploids: the case of the endangered shortnose sturgeon (Acipenser brevirostrum)

    Science.gov (United States)

    King, Timothy L.; Henderson, Anne P.; Kynard, Boyd E.; Kieffer, Micah C.; Peterson, Douglas L.; Aunins, Aaron W.; Brown, Bonnie L.

    2014-01-01

    The shortnose sturgeon, Acipenser brevirostrum, oft considered a phylogenetic relic, is listed as an “endangered species threatened with extinction” in the US and “Vulnerable” on the IUCN Red List. Effective conservation of A. brevirostrum depends on understanding its diversity and evolutionary processes, yet challenges associated with the polyploid nature of its nuclear genome have heretofore limited population genetic analysis to maternally inherited haploid characters. We developed a suite of polysomic microsatellite DNA markers and characterized a sample of 561 shortnose sturgeon collected from major extant populations along the North American Atlantic coast. The 181 alleles observed at 11 loci were scored as binary loci and the data were subjected to multivariate ordination, Bayesian clustering, hierarchical partitioning of variance, and among-population distance metric tests. The methods uncovered moderately high levels of gene diversity suggesting population structuring across and within three metapopulations (Northeast, Mid-Atlantic, and Southeast) that encompass seven demographically discrete and evolutionarily distinct lineages. The predicted groups are consistent with previously described behavioral patterns, especially dispersal and migration, supporting the interpretation that A. brevirostrum exhibit adaptive differences based on watershed. Combined with results of prior genetic (mitochondrial DNA) and behavioral studies, the current work suggests that dispersal is an important factor in maintaining genetic diversity in A. brevirostrum and that the basic unit for conservation management is arguably the local population.

  16. Development of polysomic microsatellite markers for characterization of population structuring and phylogeography in the shortnose sturgeon (Acipenser brevirostrum)

    Science.gov (United States)

    Henderson, Anne P.; King, Tim L.

    2012-01-01

    Shortnose sturgeon Acipenser brevirostrum is an endangered polyploid fish species for which no nuclear DNA markers previously existed. To address this need, 86 polysomic loci were developed and characterized in 20 A. brevirostrum from five river systems and eight members (parents and six progeny) of a captive-bred family. All markers proved to be polymorphic, polysomic, and demonstrated direct inheritance when tested in a captive family. Eleven loci were included in a range-wide survey of 561 fish sampled from 17 geographic collections. Allelic diversity at these markers ranged from 7 to 24 alleles/locus and averaged 16.5 alleles/locus; sufficient diversity to produce unique multilocus genotypes. In the range-wide survey, a Mantel comparison of an ecological (1-Jaccard’s) and genetic (ΦPT; an analog to FST) distance metrics, identified a strong positive correlation (r = 0.98, P PT represents a viable metric for assessing genetic relatedness using this class of marker.

  17. Dietary Administration of Lactobacillus plantarum Enhanced Growth Performance and Innate Immune Response of Siberian Sturgeon, Acipenser baerii.

    Science.gov (United States)

    Pourgholam, Moheb Ali; Khara, Hossein; Safari, Reza; Sadati, Mohammad Ali Yazdani; Aramli, Mohammad Sadegh

    2016-03-01

    We investigated the effects of Lactobacillus plantarum used as a dietary supplement on the growth performance and innate immune response in juvenile Siberian sturgeon Acipenser baerii. Juvenile fish (14.6 ± 2.3 g) were fed three experimental diets prepared by supplementing a basal diet with L. plantarum at different concentrations [1 × 10(7), 1 × 10(8) and 1 × 10(9) colony-forming units (cfu) g(-1)] and a control (non-supplemented basal) diet for 8 weeks. Growth performance indices were increased in fish fed the 1 × 10(8) cfu g(-1) L. plantarum diet compared to the other groups. There was an increased innate immune response in fish fed the experimental diets. The highest levels of lysozyme activity, total immunoglobulin (IgM) and complement component 3 (C3) were observed in fish fed the diet containing L. plantarum at a concentration of 1 × 10(8) cfu g(-1), but there was no significant difference in the level of complement component 4 (C4) in fish fed the experimental diets or the control diet. The present study underlying some positive effects (growth performance and immune indices) of dietary administration of L. plantarum at a concentration of 1 × 10(8) cfu g(-1) in the Siberian sturgeon.

  18. Discovery and evaluation of candidate sex-determining genes and xenobiotics in the gonads of lake sturgeon (Acipenser fulvescens).

    Science.gov (United States)

    Hale, Matthew C; Jackson, James R; Dewoody, J Andrew

    2010-07-01

    Modern pyrosequencing has the potential to uncover many interesting aspects of genome evolution, even in lineages where genomic resources are scarce. In particular, 454 pyrosequencing of nonmodel species has been used to characterize expressed sequence tags, xenobiotics, gene ontologies, and relative levels of gene expression. Herein, we use pyrosequencing to study the evolution of genes expressed in the gonads of a polyploid fish, the lake sturgeon (Acipenser fulvescens). Using 454 pyrosequencing of transcribed genes, we produced more than 125 MB of sequence data from 473,577 high-quality sequencing reads. Sequences that passed stringent quality control thresholds were assembled into 12,791 male contigs and 32,629 female contigs. Average depth of coverage was 4.2 x for the male assembly and 5.5x for the female assembly. Analytical rarefaction indicates that our assemblies include most of the genes expressed in lake sturgeon gonads. Over 86,700 sequencing reads were assigned gene ontologies, many to general housekeeping genes like protein, RNA, and ion binding genes. We searched specifically for sex determining genes and documented significant sex differences in the expression of two genes involved in animal sex determination, DMRT1 and TRA-1. DMRT1 is the master sex determining gene in birds and in medaka (Oryzias latipes) whereas TRA-1 helps direct sexual differentiation in nematodes. We also searched the lake sturgeon assembly for evidence of xenobiotic organisms that may exist as endosymbionts. Our results suggest that exogenous parasites (trematodes) and pathogens (protozoans) apparently have infected lake sturgeon gonads, and the trematodes have horizontally transferred some genes to the lake sturgeon genome.

  19. Expression and phylogeny of candidate genes for sex differentiation in a primitive fish species, the Siberian sturgeon, Acipenser baerii.

    Science.gov (United States)

    Berbejillo, Julio; Martinez-Bengochea, Anabel; Bedo, Gabriela; Brunet, Frédéric; Volff, Jean-Nicolas; Vizziano-Cantonnet, Denise

    2012-08-01

    The molecular mechanisms underlying testis differentiation in basal actinopterygian fish remains poorly understood. The sex differentiation period was investigated in the Siberian sturgeon, Acipenser baerii, by expression profiling of Sertoli cell transcription factors (dmrt1, sox9) that control testis differentiation in vertebrates; Leydig cell factors (cyp17a1, star) affecting androgen production; the androgen receptor (ar); a growth factor controlling testis development (igf1); and a gene coding for a gonadotropin hormone (lh). Two genes were characterised for the first time in the Siberian sturgeon (dmrt1, cyp17a1), while the others came from public databases. Sturgeon gonad development is very slow, with a late sexual differentiation time during their juvenile stage, and are still immature at 3 years of age. Immature fish showed a sex-dimorphic pattern; all the genes studied displayed a higher expression level in male gonads. We took advantage of the presence of juvenile fish with pre- and post-differentiated gonads (16 and 18 months old) to characterise them at the molecular level. The post-differentiated fish displayed a sex dimorphism of gene expression in their gonads for all genes studied, with the exception of sox9. The trends in undifferentiated fish lead us to propose that sturgeons undergoing male differentiation express high levels of Sertoli cell factors (dmrt1, sox9) and of genes involved in the production and receptivity of androgens (cyp17a1, star and ar) together with lh. Expression profiles and phylogenetic studies suggest that these genes are potential regulators of testis development in the Siberian sturgeon.

  20. Survival of hatchery Gulf sturgeon (Acipenser oxyrinchus desotoi Mitchill, 1815) in the Suwannee River, Florida: a 19-year evaluation

    Science.gov (United States)

    Sulak, Kenneth J.; Randall, Michael; Clugston, J.P.

    2014-01-01

    An experimental release of 1192 hatchery-reared, individually PIT tagged, 220 days old (296–337 mm TL) Gulf sturgeon, Acipenser oxyrinchus desotoi, was undertaken in 1992 in the Suwannee River, Florida. The original objectives of the 1992 release experiment were to: (1) evaluate survival rate of cultured Gulf sturgeon in the wild vs survival rate of their wild 1992 cohort counterparts, (2) determine the differential effect of release site within the river upon long-term survival, and (3) evaluate comparative growth rates of recaptured hatchery vs captured wild 1992 cohort Gulf sturgeon. The present investigation addressed those original objectives, plus an additional fourth objective: (4) evaluation of hatchery fish recapture rate change over the 19-year experiment. The primary objective was to determine efficacy of potential conservation aquaculture for this species in terms of long-term survival in the wild. Follow-up 1993–2011 gill net sampling in freshwater reaches (rkm 4–237) and the estuarine river mouth (rkm −6 to 4) yielded recaptures representing 13.0% of the total released. Mean annual hatchery fish mortality (including emigration) rate estimated for the 19-year period (1993–2011) was more than twice that for same cohort wild fish. Mark-recapture survival probability (phi) for hatchery fish, 1993–2011, was substantially lower (0.733) than for their wild counterparts (0.888). Mean annual hatchery fish recapture rate, as a percentage of all 1992 cohort fish recaptures, declined significantly after age-7, coinciding with age of onset of migration into the open Gulf of Mexico. Hypothesized causal factors may be differentially lower fitness in the marine habitat or permanent outmigration due to natal river imprinting failure. Hatchery fish recapture rates varied significantly for fish from the ten release sites, being highest near the river mouth, and lowest for the furthest upriver sites in the Suwannee River and its Santa Fe River tributary

  1. Temporal trends of polychlorinated biphenyls, polybrominated diphenyl ethers, and perfluorinated compounds in Chinese sturgeon (Acipenser sinensis) eggs (1984-2008).

    Science.gov (United States)

    Jianxian, Sun; Hui, Peng; Jianying, Hu

    2015-02-03

    Because investigation on the temporal trends of persistent halogenated compounds (PHCs) is necessary to predict their future impacts on the environment and human health and evaluate the effectiveness of regulations on their production and usage, it is of concern to investigate annual temporal trends of PHCs in biota samples. This study examined the temporal trends of polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), and perfluorinated compounds (PFCs) in Chinese sturgeon (Acipenser sinensis) eggs over a period of 25 years (1984-2008), and 62 PCBs (19.2-1030 ng/g dw for total PCBs), 16 PBDEs (4.7-572 ng/g dw for total PBDEs), and 14 PFCs (26-46 ng/g dw for total PFCs) were detected. Although a decreasing temporal trend was observed for total PCBs with annual reduction rate of 3.4% (ρ = 0.005), a clear break point was observed around 1991, indicating their continuing emission in the 1980s in China. All major PBDEs showed increasing temporal trends, with annual change rates at 3.5-10.2% over the 25 years, but a sharp decreasing trend was observed after 2006, indicating a rapid response to the banning of PBDE usage in China in 2004. The greatest annual rate of increase was observed for BDE-28 (10.2%) followed by BDE-100 (7.7%), which would be due to metabolism input from higher brominated PBDEs. Significantly increasing temporal trends were observed for all PFCs, and the annual rates of increase were 7.9% and 5.9% for total perfluorinated carboxylic acids and perfluorooctanesulfonate (PFOS), respectively. A peak concentration for PFOS was observed in 1989, which may be related to the import history of PFCs in China. The present study is the first report of systematic temporal trends of PHCs in biota samples from China and shows that regulatory policy is needed to reduce their potential health and ecological risk in China considering the increasing temporal trends of PBDEs and PFCs.

  2. Effects of diazinon on adaptation to sea-water by the endangered Persian sturgeon, Acipenser persicus, fingerlings.

    Science.gov (United States)

    Hajirezaee, Saeed; Mirvaghefi, Ali Reza; Farahmand, Hamid; Agh, Naser

    2016-11-01

    To replenish the depleting populations of sturgeon fishes especially Persian sturgeon, Acipenser persicus in the Caspian Sea, millions of Persian sturgeon fingerlings are farmed through artificial propagation and released into the Iranian river estuaries annually. Fish osmoregulation is a vital physiological process that can be affected during the release. Many Iranian river estuaries are under the influence of pesticides originating from farming activities that may affect osmoregulation. In this study, Persian sturgeon fingerlings were exposed to sublethal concentrations (0, 0.18, 0.54, 0.9mgL(-)(1)) of diazinon for 96h (short-term trial) and 12 days (long-term trial) in fresh water (FW) and then fish were exposed in brackish water (BW) for 24h. After 96h and 12 days of exposure in FW, the lower levels of plasma triidothyronine (T3), thyroxine (T4), Na(+), Cl(-), K(+), gill Na(+)/K(+)- ATPase activity and number of chloride cells were observed in exposed fish (0.54 and 0.9mgL(-)(1) diazinon) compared to control group and 0.18mgL(-)(1) diazinon treatment. Also, higher levels of plasma cortisol (except 0.18mgL(-)(1) diazinon treatment in long-term trial) were observed in diazinon exposed fish compared to control group. However, gill Na(+)/K(+)-ATPase activity and the number of chloride cells were higher in fingerlings exposed to diazinon compared than control. When fish were exposed in BW for 24h, the following changes occurred: (a) in short-term trial: increases in cortisol and Cl(-) levels (0.54mgL(-)(1) diazinon ), Na(+) (0.9mgL(-)(1) diazinon ) and gill Na(+)/K(+)-ATPase activity (0.18mgL(-)(1) diazinon ). In control group, cortisol, T4, Na(+), gill Na(+)/K(+)-ATPase activity and the number of chloride cells increased significantly. (b) In long-term trial: increases in K(+) levels in fish exposed to 0.9mgL(-)(1) diazinon, Na+ in all diazinon concentrations and decreases in chloride cells number in fish exposed to 0.18mgL(-)(1) diazinon. In control group

  3. Vertebral Development and Ossification in the Siberian Sturgeon (Acipenser Baerii), with New Insights on Bone Histology and Ultrastructure of Vertebral Elements and Scutes.

    Science.gov (United States)

    Leprévost, Amandine; AzaÏs, Thierry; Trichet, Michael; Sire, Jean-Yves

    2017-03-01

    In order to improve our knowledge on the vertebral development, structure and mineralization in Acipenseriformes, we undertook a study in a growth series of reared Siberian sturgeons (Acipenser baerii) using in toto clear and stain specimens, histological and ultrastructural observations, X-ray micro-tomography, and solid state NMR analyses. Scutes were also studied to compare the tissue structure and mineralization of endoskeletal and dermal skeletal elements. This study completes and clarifies previous investigations on vertebral development and architecture in sturgeons, and brings original data on the structure of (i) the perichondral bone that is progressively deposited around the vertebral elements during ontogeny, (ii) the typical cartilage composing these elements, and (iii) the scutes. In addition we provide data on the mineralization process, on the nature of the bone mineral phase, and on the growth dynamics of the vertebral elements. Anat Rec, 300:437-449, 2017. © 2016 Wiley Periodicals, Inc.

  4. Effect of dietary macronutrient proportion on intermediate metabolism and oxidative status in sturgeon (Acipenser naccarii) and trout (Oncorhynchus mykiss): comparative study.

    Science.gov (United States)

    Furné, M; García-Gallego, M; Hidalgo, M C; Sanz, A

    2016-08-01

    Three isoenergetic diets varying the proportion of dietary energy supplied by each of the macronutrients (carbohydrate, lipid, or protein) were delivered, to farmed sturgeon (Acipenser naccarii) and trout (Oncorhynchus mykiss), to test the possible effects on the intermediate metabolism and oxidative status in liver, white muscle, and heart. In trout, there is an adaptive metabolic response to an increase in lipids and carbohydrates in the diet. However, this does not happen in the sturgeon. These differences may be due to different dietary habits of both species. In terms of oxidative status, only the liver displayed oxidative stress in both species, showing an increase in the lipid peroxidation and antioxidant enzyme activities after feeding with the high-lipid and high-protein diet.

  5. Larval green and white sturgeon swimming performance in relation to water-diversion flows

    OpenAIRE

    Verhille, Christine E.; Poletto, Jamilynn B.; Cocherell, Dennis E.; DeCourten, Bethany; Baird, Sarah; Joseph J Cech; Fangue, Nann A.

    2014-01-01

    Little is known of the swimming capacities of larval sturgeons, despite global population declines in many species due in part to fragmentation of their spawning and rearing habitats by man-made water-diversion structures. Larval green (Acipenser medirostris) and white sturgeon (Acipenser transmontanus) inhabit the highly altered Sacramento–San Joaquin watershed, making them logical species to examine vulnerability to entrainment by altered water flows. The risk of larval sturgeon entrainment...

  6. Recovery of white sturgeon populations through natural production: Understanding the influence of abiotic and biotic factors on spawning and subsequent recruitment

    Science.gov (United States)

    Parsley, M.J.; Anders, P.J.; Miller, A.I.; Beckman, L.G.; McCabe, G.T.

    2002-01-01

    Recovery or maintenance of sturgeon populations through natural production in perturbed rivers requires adequate knowledge of the abiotic and biotic factors that influence spawning and cause mortality of embryonic, larval, and juvenile life stages. Although it is known that year-class strength of white sturgeon Acipenser transmontanus is determined within 2-3 months after spawning, little is known about specific causes of mortality to early life stages during this period. Initial spawning success is critical in the development of a strong year-class, and maximized recruitment may be dependent upon water temperature and the availability of optimal in-river habitat. Analyses have shown that increased river discharge combined with suitable water temperatures during spawning, egg incubation, yolk sac larvae dispersal, and first exogenous feeding result in greater recruitment. However, little is known about the importance of other variables, such as food availability or losses due to predation that influence year-class strength. ?? 2002 by the American Fisheries Society.

  7. First record predation on white sturgeon eggs by sympatric fishes

    Science.gov (United States)

    Miller, A.I.; Beckman, L.G.

    1996-01-01

    We report the occurrence of white sturgeon Acipenser transmontanus eggs in guts of four species of fish from the Columbia River. Three of the species—northern squawfish Ptychocheilus oregonensis, largescale sucker Catostomus macrocheilus, and prickly sentpin Cottus asper—are native to the river and one, common carp Cvprinus carpio, is exotic.

  8. Growth Performance and Feed Utilization of Russian Sturgeon Acipenser gueldenstaedtii Brandt&Ratzeburg, 1833 in Grow-out Phase Cultured in the Black Sea

    Directory of Open Access Journals (Sweden)

    Mehmet Kocabaş

    2015-10-01

    Full Text Available The aim of present study was to determine the growth performance of Russian sturgeon Acipenser gueldenstaedtii throughout 5 years and to investigate problems encountered in grow-out phase. Fish samples (2750.88±351.18 g, 80.18±6.49 cm mean±SD were equally stocked into fiberglass tanks, three replicate per treatment and fed for 5 years. Gain of weight and length, Specific Growth Rate (SGR, Condition Factor (CF and Feed Conversion Ratio (FCR were determined. Our results indicated that mean final length and weight were 106.34±2.79 (cm and 6651.16±3.16 (g. The mean condition factor (CF at year 5 was 0.51. FCR values fluctuated and the highest value of food conversion rate (FCR was determined in 4th year. During the rearing period of Russian sturgeon, SGR values decreased dramatically from 2.88 to 1.83. In conclusion, slow growth was determined in Russian sturgeon A. gueldenstaedtii. Therefore, there is need for extensive evaluation and comparison of data obtained from field studies and those obtained from laboratory studies.

  9. Feeding habitats of the Gulf sturgeon, Acipenser oxyrinchus desotoi, in the Suwannee and Yellow rivers, Florida, as identified by multiple stable isotope analyses

    Science.gov (United States)

    Sulak, Kenneth J.; Berg, James J.; Randall, Michael

    2012-01-01

    Stable 13C, 15N, and 34S isotopes were analyzed to define the feeding habitats of Acipenser oxyrinchus desotoi in the Suwannee and Yellow River populations. For the majority (93.9%) of Suwannee subadults and adults, 13C and 34S signatures indicate use of nearshore marine waters as primary winter feeding habitat, probably due to the limiting size of the Suwannee Sound estuary. In the Yellow River population, 13C isotope signatures indicate that adults remain primarily within Pensacola Bay estuary to feed in winter, rather than emigrating to the open Gulf of Mexico. A minor Suwannee River subset (6% of samples), comprised of juveniles and subadults, displayed 13C signatures indicating continued feeding in freshwater during the spring immigration and fall emigration periods. This cannot be interpreted as incidental feeding since it resulted in a 20.5% turnover in tissue δ13C signatures over a 1–3 month period. Cessation of feeding in the general population does not coincide with high river water temperatures. The hypothesis of reduced feeding in freshwater due to localized prey depletion as a result of spatial activity restriction is not supported by the present study. Instead, Suwannee River A. o. desotoi appear to follow two trophic alternatives; 1) complete cessation of feeding immediately upon immigration in spring, continuing through emigration 8–9 months later (the predominant alternative); 2) continued intensive feeding for 1–3 months following immigration, switching to freshwater prey, selected primarily from high trophic levels (i.e., large prey). Stable –34S data verifies that recently immigrated, fully-anadromous A. o. desotoi adults had fed in nearshore marine waters, not offshore waters.

  10. Effects of pre-incubation of eggs in fresh water and varying sperm concentration on fertilization rate in sterlet sturgeon, Acipenser ruthenus.

    Science.gov (United States)

    Siddique, Mohammad Abdul Momin; Butts, Ian Anthony Ernest; Psenicka, Martin; Linhart, Otomar

    2015-08-01

    Standardization of fertilization protocols for sterlet Acipenser ruthenus is crucial for improving reproductive techniques and for conservation purposes. Our objectives were to determine the number of sperm (tested 430,000:1, 43,000:1, 4300:1, 430:1 sperm to egg) required to fertilize eggs and explore how pre-incubation of eggs in freshwater for 0min, 0.5min, 1min, and 10min interacts with different sperm ratios. Fertilization success ranged from 29.7% at 430:1 to 84.2% at 430,000:1. Pre-incubation time had no effect on fertilization success at 430,000:1 and 43,000:1 sperm to egg ratios, while it was significant at the 4300:1 and 430:1 ratios. The use of adequate experimental suboptimal sperm to egg ratio revealed a positive effect of pre-incubation time, such that at the 430:1 ratio, 0.5min pre-incubation increased the fertilization rate than 10min. At 0min pre-incubation the proportion of fertilized eggs increased at the 430,000:1 ratio, while at 1min fertilization increased at the 4300:1 ratio. At the 10min pre-incubation time, fertilization increased at the 43,000:1 ratio. Moreover, at the 0.5min pre-incubation time, the 43,000:1 ratio increased the fertilization rate than the 430:1 ratio. Generally, for 430:1 ratio, the fertilization rate is lower than in control. Transmission electron microscopy showed that pre-incubation of eggs in water for sperm to egg ratio 0.5 to 1min pre-incubation of eggs in freshwater prior to fertilization can enhance fertilization rate of sterlet.

  11. Neomycin damage and regeneration of hair cells in both mechanoreceptor and electroreceptor lateral line organs of the larval Siberian sturgeon (Acipenser baerii).

    Science.gov (United States)

    Fan, Chunxin; Zou, Sha; Wang, Jian; Zhang, Bo; Song, Jiakun

    2016-05-01

    The lateral line found in some amphibians and fishes has two distinctive classes of sensory organs: mechanoreceptors (neuromasts) and electroreceptors (ampullary organs). Hair cells in neuromasts can be damaged by aminoglycoside antibiotics and they will regenerate rapidly afterward. Aminoglycoside sensitivity and the capacity for regeneration have not been investigated in ampullary organs. We treated Siberian sturgeon (Acipenser baerii) larvae with neomycin and observed loss and regeneration of sensory hair cells in both organs by labeling with DASPEI and scanning electron microscopy (SEM). The numbers of sensory hair cells in both organs were reduced to the lowest levels at 6 hours posttreatment (hpt). New sensory hair cells began to appear at 12 hpt and were regenerated completely in 7 days. To reveal the possible mechanism for ampullary hair cell regeneration, we analyzed cell proliferation and the expression of neural placodal gene eya1 during regeneration. Both cell proliferation and eya1 expression were concentrated in peripheral mantle cells and both increased to the highest level at 12 hpt, which is consistent with the time course for regeneration of the ampullary hair cells. Furthermore, we used Texas Red-conjugated gentamicin in an uptake assay following pretreatment with a cation channel blocker (amiloride) and found that entry of the antibiotic was suppressed in both organs. Together, our results indicate that ampullary hair cells in Siberian sturgeon larvae can be damaged by neomycin exposure and they can regenerate rapidly. We suggest that the mechanisms for aminoglycoside uptake and hair cell regeneration are conserved for mechanoreceptors and electroreceptors. J. Comp. Neurol. 524:1443-1456, 2016. © 2015 Wiley Periodicals, Inc.

  12. Predicted effects of future climate warming on thermal habitat suitability for Lake Sturgeon (Acipenser fulvescens, Rafinesque, 1817) in rivers in Wisconsin, USA

    Science.gov (United States)

    Lyons, John D.; Stewart, Jana S.

    2015-01-01

    The Lake Sturgeon (Acipenser fulvescens, Rafinesque, 1817) may be threatened by future climate warming. The purpose of this study was to identify river reaches in Wisconsin, USA, where they might be vulnerable to warming water temperatures. In Wisconsin, A. fulvescens is known from 2291 km of large-river habitat that has been fragmented into 48 discrete river-lake networks isolated by impassable dams. Although the exact temperature tolerances are uncertain, water temperatures above 28–30°C are potentially less suitable for this coolwater species. Predictions from 13 downscaled global climate models were input to a lotic water temperature model to estimate amounts of potential thermally less-suitable habitat at present and for 2046–2065. Currently, 341 km (14.9%) of the known habitat are estimated to regularly exceed 28°C for an entire day, but only 6 km (0.3%) to exceed 30°C. In 2046–2065, 685–2164 km (29.9–94.5%) are projected to exceed 28°C and 33–1056 km (1.4–46.1%) to exceed 30°C. Most river-lake networks have cooler segments, large tributaries, or lakes that might provide temporary escape from potentially less suitable temperatures, but 12 short networks in the Lower Fox and Middle Wisconsin rivers totaling 93.6 km are projected to have no potential thermal refugia. One possible adaptation to climate change could be to provide fish passage or translocation so that riverine Lake Sturgeon might have access to more thermally suitable habitats.

  13. Evidence of circadian rhythm, oxygen regulation capacity, metabolic repeatability and positive correlations between forced and spontaneous maximal metabolic rates in lake sturgeon Acipenser fulvescens.

    Directory of Open Access Journals (Sweden)

    Jon C Svendsen

    Full Text Available Animal metabolic rate is variable and may be affected by endogenous and exogenous factors, but such relationships remain poorly understood in many primitive fishes, including members of the family Acipenseridae (sturgeons. Using juvenile lake sturgeon (Acipenser fulvescens, the objective of this study was to test four hypotheses: 1 A. fulvescens exhibits a circadian rhythm influencing metabolic rate and behaviour; 2 A. fulvescens has the capacity to regulate metabolic rate when exposed to environmental hypoxia; 3 measurements of forced maximum metabolic rate (MMR(F are repeatable in individual fish; and 4 MMR(F correlates positively with spontaneous maximum metabolic rate (MMR(S. Metabolic rates were measured using intermittent flow respirometry, and a standard chase protocol was employed to elicit MMR(F. Trials lasting 24 h were used to measure standard metabolic rate (SMR and MMR(S. Repeatability and correlations between MMR(F and MMR(S were analyzed using residual body mass corrected values. Results revealed that A. fulvescens exhibit a circadian rhythm in metabolic rate, with metabolism peaking at dawn. SMR was unaffected by hypoxia (30% air saturation (O(2sat, demonstrating oxygen regulation. In contrast, MMR(F was affected by hypoxia and decreased across the range from 100% O(2sat to 70% O(2sat. MMR(F was repeatable in individual fish, and MMR(F correlated positively with MMR(S, but the relationships between MMR(F and MMR(S were only revealed in fish exposed to hypoxia or 24 h constant light (i.e. environmental stressor. Our study provides evidence that the physiology of A. fulvescens is influenced by a circadian rhythm and suggests that A. fulvescens is an oxygen regulator, like most teleost fish. Finally, metabolic repeatability and positive correlations between MMR(F and MMR(S support the conjecture that MMR(F represents a measure of organism performance that could be a target of natural selection.

  14. 西伯利亚鲟仔稚鱼胚后发育的形态学和组织学观察%Observations on morphology of post-embryonic development and histology of sensory organs in larval and juvenile Siberian sturgeon,Acipenser baerii

    Institute of Scientific and Technical Information of China (English)

    宋炜; 宋佳坤

    2012-01-01

    Siberian sturgeon, Acipenser baerii, one of the oldest extant cold-water fish species in the world, are of considerable research and economic value. We documented the postembryonic development of the Siberian sturgeon by monitoring morphological characteristics and cell types in retina, taste buds, olfactory sac, and ampullary organs in the larvae. The stages of postembryonic development were defined based on both the external morphology and the internal organ characteristics. Larvae were reared at a water temperature of (18.0±1.0)℃ and a pH of 7.0-7.5. The newly hatched larvae (day 0) were (9.05±0.14) mm long. During the early-stages of development (days 0-7), the larvae were nurtured by a large yolk sac and the eye was the primary sense organ. The late-stage larvae (day 8-22) were characterized by the disappearance of the yolk sac and initiation of active feeding, the formation of fins and fin rays, a shift in habitat use towards the bottom of the water column, and the completion of organ differentiation. As larvae reached the juvenile stage (day 23-57), the scutes begin to form, the organs tended to become fully developed, and the external morphology and body color pattern gradually matured into the adult pattern. We observed some differences in the development characteristics of the primary sensory organs in Siberian sturgeon relative to other teleosts. Our observations suggest that Siberian sturgeon is an ancient species that occupy a unique position during the evolution of teleosts.%应用形态学和组织学研究技术对西伯利亚鲟(Acipenser baerii)仔稚鱼发育进行了较详细的观察,通过外部形态变化和内部器官发育情况,对西伯利亚鲟仔稚鱼发育各阶段进行区分.在水温(18.0±1.0)℃,pH 7.0~7.5的条件下,初孵仔鱼平均全长(9.05±0.14) mm,出膜后7日内为早期仔鱼阶段,仔鱼以卵黄囊作为营养来源,视觉是主要的感觉功能;8日龄至22日龄为晚期仔鱼阶段,最显著的特点

  15. 史氏鲟鱼皮制革工艺研究%On leatherworking technology of Amur sturgeon ( Acipenser schrenckii) fishskin

    Institute of Scientific and Technical Information of China (English)

    许永安; 吴靖娜

    2011-01-01

    The Amur sturgeon cartilaginous taked as the material, the leatherworking technology was studied. Results showed that the optimum formaldehyde addition was 0.4% ; 8% lime, 3% sodimum sulfide (60% content) and 1.5% sodium hydrosulfide (60% content) , the sensory evaluation of leather by this ratio was better; the sensory evaluation of leather in the condition of 0.8 enzyme amount , 35 ℃, and 1.5 h was better; and the combination of 2% sodium chlorite and 1.5% sodium bisulfite showed the best bleaching effect. Based on above research, the optimizing leather technology of amur sturgeon fishskin was established. The physical and chemical properties of amur sturgeon leather by this technology were better than the standard of shoe upper leather QB/T 1873 -2004 and the standard of clothes leather QB 1872 -1993.%以史氏鲟(Acipenser schrenckii鱼皮为原料,对其制革工艺进行研究,结果表明,预浸水中添加0.4%的甲醛,防止鲟鱼皮大骨板松动的效果最佳;浸灰液配比为8%石灰、3%硫化钠(含量60%)、1.5%硫氢化钠(含量60%)时,研制的皮革感官评价较佳;软化工艺以酶量0.8%、温度35℃、时间1.5h研制的皮革感官评价较好;鲟鱼皮的脱色效果以亚氯酸钠(2%)和亚硫酸氢钠(1.5%)组合的氧化还原漂白法效果最佳.研究确立了鲟鱼皮制革优化工艺,该工艺试制的鲟鱼皮革其物理、化学性能指标总体上大大优于QB/T 1873-2004鞋面用皮革标准和QB 1872-1993服装用皮革标准.

  16. Length-weight relationship and a relative condition factor equation for lake sturgeon (Acipenser fulvescens) from the St. Clair River system (Michigan, USA)

    Science.gov (United States)

    Craig, Jaquelyn; Thomas, Michael V.; Nichols, Susan Jerrine

    2005-01-01

    Several USA state, federal, and Canadian agencies study lake sturgeon (Acipenser fulvescens) within the St Clair River and Lake St Clair, collectively referred to hereafter as the St Clair River (SCR) system. Previously, there has been no set standard for determining condition for SCR system lake sturgeon. Condition measures the variation from the expected weight for length as an indicator of fatness, general well-being, gonad development, etc. The aim of this project was to determine the length–weight relationship of lake sturgeon caught from the SCR system, from which a relative condition factor (Kn) equation could be derived. Total length (TL, mm) and weight (W, kg) were measured for 1074 lake sturgeon (101 males and 16 females were identifiable) collected by setline and bottom trawl from the SCR system in May–September, 1997–2002. Analysis of covariance found no difference in the length–weight relationship between sampling gear or sex. Least-squares regression of log10W × log10TL produced the overall equation logW = 3.365logTL − 9.320. Using the exponential form of the slope and y-intercept, relative condition factor for lake sturgeon from the SCR system can be calculated as Kn = W/[(4.786 × 10−10)(TL3.365)]. Equations for males and females were also developed. Overall, body condition was significantly correlated with both age and girth; no significant difference in Kn by sex was found. In general, the SCR lake sturgeon population was near the upper ends of growth and condition ranges listed in the literature, comparable with those populations that are at similar latitudes. Although condition factors should be interpreted with caution, proper use of a standard equation provides a non-lethal measure of overall fish health that can be used by biologists and managers in ongoing efforts to restore lake sturgeon throughout the Great Lakes.

  17. 中华鲟子二代仔鱼对光照强度的趋性行为%Phototactic behavior of second filial Acipenser sinensis larva

    Institute of Scientific and Technical Information of China (English)

    郭柏福; 袁涛; 石小涛; 高勇

    2013-01-01

    设计4种点光源(100 lx、320 lx、960 lx、1920 lx)光照模式,以黑暗和面光源(68 lx)模式为对照,以30 min为实验周期,对中华鲟(Acipenser sinensis)子二代仔、幼鱼(5~29日龄)的趋光行为进行观察和统计分析。结果表明,仔鱼处于平游期(5~8日龄)时,点光源光照条件下活动鱼苗的趋光率显著高于对照组(黑暗环境和面光源)(P<0.05),而且点光源光照条件下活动鱼苗的趋光率随着光照强度的增强而增加,并在1920 lx与100 lx和320 lx间存在显著性差异(P<0.05)。平游期仔鱼的趋光性最为明显,在设定的4种点光源光照强度中,在100 lx的低强度光照下趋光性最强,在960 lx光照强度下趋光性最弱,且二者存在显著性差异(P<0.05);中华鲟子二代进入沉底期以后,光照的影响作用明显减弱,仔鱼基本失去趋光性。研究表明,中华鲟子二代仔鱼具有平游期趋光性最强、趋弱光和沉底之后基本失去趋光性等行为特点,这种趋光行为与野生中华鲟仔鱼基本一致。研究结果可为阐明中华鲟全人工繁殖后代生态适应性提供参考。%Chinese sturgeon (Acipenser sinensis) is a species of anadromous migratory large fish living for decades, and is a special rare fish in China. In 2009, we got the second filial generation (F2) from the F1 of this species by complete artificial propagation under fresh water, which meant China got successful progress in conservation of A. sinensis. But the question is if there exists difference in biologic characteristics between the wild species and arti-ficial F2. In this study, we tested the response of larval A.sinensis F2 to four light intensities (100, 320, 960, and 1 920 lx), and two modes of illumination (dark and surface light source). The phototactic behavior of each indi-vidual was observed for 30 min/d for 24 consecutive days. Between 0-8 d after hatch (dah), the individual ratio of phototaxis movement in

  18. 三、水产资源

    Institute of Scientific and Technical Information of China (English)

    1998-01-01

    980069 加利福尼亚州圣弗兰西期科湾的高首鲟的生殖条件=The reproductive condi-tion of white sturgeon,Acipenser transmon-tanus,in San Francisco Bay,California[刊,英]/Chapman F A//Fish.Bull..—1996,94(4).—628~634在加利福尼亚圣弗兰西斯科湾高首鲟Acipenser transmontanus 摄饵场采捕成鱼(855尾),用组织学评价其性别和性成熟阶

  19. 多倍体中华鲟微卫星亲子鉴定体系的建立%Parentage identification of polyploidy Acipenser sinensis based on microsatellite markers

    Institute of Scientific and Technical Information of China (English)

    辛苗苗; 张书环; 汪登强; 汪珂; 张磊; 霍来江; 危起伟

    2015-01-01

    应用荧光引物和自动测序技术,检测了10个自主研发的微卫星分子标记在68个中华鲟( Acipenser sinensis)个体中的遗传多态性。结果表明,10个微卫星标记共检测到124个等位基因,等位基因数为7~22,期望杂合度为0.73026~0.87395, Shannon-Wiener多样性指数为1.56161~2.21960。基于亲子鉴定排除率不低于0.99的标准,最终确定Asi-75067、 Asi-67648、 Asi-67123、 Asi-73843、 Asi-72040、 Asi-70421和Asi-56700等7个微卫星标记为中华鲟亲子鉴定的核心体系,其单亲、父权和双亲的累积排除率分别为99.12%、99.95%和99.99%。该微卫星标记组合为中华鲟准确高效经济的亲子鉴定体系建立提供了科学依据。%10 novel microsatellite markers were used for assessing genetic diversity of 68 Acipenser sinensis individuals.The results demonstrated that there were 124 alleles in 10 loci and the number of alleles, mean expected heterozygosities and Shannon-Wiener Diversity Indices per locus ranged from 7 to 22, from 0.730 26 to 0.873 95 and from 1.561 61 to 2.219 60, respectively.With the criterion that cumulative exclusion probabilities were not lower than 0.99, the 7 high polymor-phic microsatellite markers (Asi-75067, Asi-67648, Asi-67123, Asi-73843, Asi-72040, Asi-70421 and Asi-56700) made up the system of paternity test for A.sinensis.The cumulative exclusion probabilities over the 7 loci of single parent, paternity and pair parent were 0.991 232, 0.999 503 and 0.999 997, respectively.These high polymorphic mic-rosatellite markers provided a scientific basis for validating paternity testing efficiently with a lower cost in A.sinensis.

  20. Prediction of Secondary Structure and B Cell Epitope of GH Protein from Acipenser sinensis%中华鲟GH蛋白二级结构和B细胞抗原表位的预测

    Institute of Scientific and Technical Information of China (English)

    刘红艳; 杨东; 张繁荣; 余来宁

    2009-01-01

    [Objective] The aim was to predict the secondary structure and B cell epitope of growth hormone (GH) protein from Acipenser sinensis. [Method] With the amino acid sequence of GH protein from A.sinensis as the base, the secondary structure of GH protein from A.sinensis was predicted by the method of Garnier-Robson, Chou-Fasman and Karplus-Schulz, and its cell epitope was predicted by the method of Kyte-Doolittle, Emini and Jameson-Wolf. [Result] The sections of 18-23, 55-56, 67-73, 83-86, 112-114, 151-157 and 209-211 in the N terminal of GH protein molecule had softer structure and these sections could sway or fold to produce more complex tertiary structure. The sections of 19-23, 51-71, 84-95, 128-139, 164-176 and 189-196 in the N terminal of GH protein could be the epitope of B cell and there were flexible regions in these sections or near these sections of GH protein molecule. So the dominant regions could be in these sections or near these sections. [Conclusion] The research provided the basis for the preparation of monoclonal antibody of GH protein from A.sinensis and provided the reference for the discussion for the molecular regulation mechanism of A.sinensis.

  1. Larval green and white sturgeon swimming performance in relation to water-diversion flows.

    Science.gov (United States)

    Verhille, Christine E; Poletto, Jamilynn B; Cocherell, Dennis E; DeCourten, Bethany; Baird, Sarah; Cech, Joseph J; Fangue, Nann A

    2014-01-01

    Little is known of the swimming capacities of larval sturgeons, despite global population declines in many species due in part to fragmentation of their spawning and rearing habitats by man-made water-diversion structures. Larval green (Acipenser medirostris) and white sturgeon (Acipenser transmontanus) inhabit the highly altered Sacramento-San Joaquin watershed, making them logical species to examine vulnerability to entrainment by altered water flows. The risk of larval sturgeon entrainment is influenced by the ontogeny of swimming capacity and dispersal timing and their interactions with water-diversion structure operations. Therefore, the aim of this study was to describe and compare the ontogeny and allometry of larval green and white sturgeon swimming capacities until completion of metamorphosis into juveniles. Despite the faster growth rates and eventual larger size of larval white sturgeon, green sturgeon critical swimming velocities remained consistently, though modestly, greater than those of white sturgeon throughout the larval life stage. Although behavioural interactions with water-diversion structures are also important considerations, regarding swimming capacity, Sacramento-San Joaquin sturgeons are most vulnerable to entrainment in February-May, when white sturgeon early larvae are in the middle Sacramento River, and April-May, when green sturgeon early larvae are in the upper river. Green sturgeon migrating downstream to the estuary and bays in October-November are also susceptible to entrainment due to their movements combined with seasonal declines in their swimming capacity. An additional inter-species comparison of the allometric relationship between critical swimming velocities and total length with several sturgeon species found throughout the world suggests a similar ontogeny of swimming capacity with growth. Therefore, although dispersal and behaviour differ among river systems and sturgeon species, similar recommendations are applicable

  2. Early clerkships

    NARCIS (Netherlands)

    Kamalski, Digna M. A.; Ter Braak, Edith W. M. T.; Ten Cate, Olle Th. J.; Borleffs, Jan C. C.

    2007-01-01

    Background: Early clinical experience is being introduced in innovative, vertically integrated undergraduate medical curricula. While in many cases, this early clinical experience is limited to the presence of patients during lectures, in Utrecht students gain 'hands on' experience of daily clinical

  3. Quantifying fish swimming behavior in response to acute exposure of aqueous copper using computer assisted video and digital image analysis

    Science.gov (United States)

    Calfee, Robin D.; Puglis, Holly J.; Little, Edward E.; Brumbaugh, William G.; Mebane, Christopher A.

    2016-01-01

    Behavioral responses of aquatic organisms to environmental contaminants can be precursors of other effects such as survival, growth, or reproduction. However, these responses may be subtle, and measurement can be challenging. Using juvenile white sturgeon (Acipenser transmontanus) with copper exposures, this paper illustrates techniques used for quantifying behavioral responses using computer assisted video and digital image analysis. In previous studies severe impairments in swimming behavior were observed among early life stage white sturgeon during acute and chronic exposures to copper. Sturgeon behavior was rapidly impaired and to the extent that survival in the field would be jeopardized, as fish would be swept downstream, or readily captured by predators. The objectives of this investigation were to illustrate protocols to quantify swimming activity during a series of acute copper exposures to determine time to effect during early lifestage development, and to understand the significance of these responses relative to survival of these vulnerable early lifestage fish. With mortality being on a time continuum, determining when copper first affects swimming ability helps us to understand the implications for population level effects. The techniques used are readily adaptable to experimental designs with other organisms and stressors.

  4. Early literacy

    DEFF Research Database (Denmark)

    Jensen, Anders Skriver

    2012-01-01

    This paper discusses findings from the Danish contribution to the EASE project, a European research project running from 2008 to 2010 on early literacy in relation to the transition from childcare to school. It explores a holistic, inclusive approach to early literacy that resists a narrow...... and schools. The paper also draws on Gee’s (2001, 2003, 2004, 2008) sociocultural approach to literacy, and Honneth’s (2003, 2006) concept of recognition. Emphasizing participation and recognition as key elements, it claims that stakeholders in early liter- acy must pay attention to how diverse early literacy...... opportunities empower children, especially when these opportunities are employed in a project-based learning environ- ment in which each child is able to contribute to the shared literacy events....

  5. 达氏鲟生长激素基因cDNA克隆、表达及免疫荧光定位研究%cDNA CLONING, EXPRESSION AND IMMUNOLOCALIZATION OF GROWTH HORMONE GENE IN ACIPENSER DABRYANUS

    Institute of Scientific and Technical Information of China (English)

    单喜双; 岳华梅; 陈细华; 叶欢; 杨晓鸽; 李创举

    2015-01-01

    为研究达氏鲟(Acipenser dabryanus)生长激素(Growth Hormone, GH)基因的功能,合成了达氏鲟垂体SMART cDNA,克隆得到GH全长cDNA序列。达氏鲟GH全长cDNA序列为1008 bp,由52 bp的5′端非编码区(Untranslated region, UTR)、编码214个氨基酸的645 bp开放阅读框(Open reading frame, ORF)和311 bp的3′UTR构成。运用GH氨基酸序列构建进化树分析发现,达氏鲟与两栖类、爬行类和哺乳类的一致性要高于真骨鱼类。实时荧光定量PCR结果表明,达氏鲟GH mRNA主要在垂体和下丘脑中表达,且垂体中GH的表达量约为下丘脑的110倍; Western-blot研究结果与qRT-PCR一致,仅在垂体和下丘脑中检测到生长激素蛋白,且垂体中GH的表达量远高于下丘脑。免疫荧光定位结果显示, GH主要定位于垂体中部,下丘脑中也有少量荧光信号;苏木精-伊红组织切片染色研究表明, GH主要是由嗜酸性的生长激素分泌细胞分泌。研究为深入研究脊椎动物生长激素基因的进化和人工养殖达氏鲟的生长调控提供了基础。%The Dabry’s sturgeon (Acipenser dabryanus Dumeril, 1868) mainly distributes in the upper Yangtze River of China. It is currently endangered due to the destruction of their spawning grounds and other anthropogenic interferences. In this study, the full-length cDNA sequence of GH was cloned from SMART cDNAs of pituitary in A. dabryanus. The Dabry’s sturgeon GH cDNA was 1008 bp in length, including a 52 bp 5′-untranslated region (UTR), a 311 bp 3′ UTR and a 645 bp open reading frame (ORF) encoding a peptide of 143 amino acids. Amino acid sequence alignment revealed that A. dabryanus GH shared extremely high identities (over 95%) with its counterparts in other sturgeons. Moreover, sturgeons showed lower GH sequence identities with other bony fish than that of Amphibia, Reptilia, Aves, and Mammalia. By quantitative real-time PCR, GH mRNAs were detected in the pituitary and hypothalamus but

  6. Status and Habitat Requirements of the White Sturgeon Populations in the Columbia River Downstream from McNary Dam, 1990-1991 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Nigro, Anthony A. (Oregon Department of Fish and Wildlife, Portland, OR)

    1991-09-01

    We report on our effort from April 1990 to March 1991 to describe the life history and population dynamics of white sturgeon Acipenser transmontanus in.John Day Reservoir. We set 1188 set lines and 26 gill nets. We caught 623 white sturgeon with set lines and 236 with gill nets. Catch per unit effort was much higher in areas near the tailrace than in downstream sites. Our setlines were size selective. We recaptured 3 fish released in John Day Reservoir in 1989 and 28 fish released in 1990. Sport and commercial fishermen recovered 62 tags from fish we tagged in Bonneville, The Dalles and John Day reservoirs, 1987-1990. We observed extensive movements of marked sturgeon within the reservoirs. We completed aging of available samples from all three reservoirs from 1987-1990. We aged fish as old as 46 years. Bone marks were observed on 74 of 78 fish previously injected with oxytetracycline and annulus formation was generally complete after June. We estimated parameters in a length-weight equation. About 1.5% of the female white sturgeon we examined to date had early or late vitellogenic eggs and would be expected to spawn the following year.

  7. Modeling white sturgeon movement in a reservoir: The effect of water quality and sturgeon density

    Science.gov (United States)

    Sullivan, A.B.; Jager, H.I.; Myers, R.

    2003-01-01

    We developed a movement model to examine the distribution and survival of white sturgeon (Acipenser transmontanus) in a reservoir subject to large spatial and temporal variation in dissolved oxygen and temperature. Temperature and dissolved oxygen were simulated by a CE-QUAL-W2 model of Brownlee Reservoir, Idaho for a typical wet, normal, and dry hydrologic year. We compared current water quality conditions to scenarios with reduced nutrient inputs to the reservoir. White sturgeon habitat quality was modeled as a function of temperature, dissolved oxygen and, in some cases, suitability for foraging and depth. We assigned a quality index to each cell along the bottom of the reservoir. The model simulated two aspects of daily movement. Advective movement simulated the tendency for animals to move toward areas with high habitat quality, and diffusion simulated density dependent movement away from areas with high sturgeon density in areas with non-lethal habitat conditions. Mortality resulted when sturgeon were unable to leave areas with lethal temperature or dissolved oxygen conditions. Water quality was highest in winter and early spring and lowest in mid to late summer. Limiting nutrient inputs reduced the area of Brownlee Reservoir with lethal conditions for sturgeon and raised the average habitat suitability throughout the reservoir. Without movement, simulated white sturgeon survival ranged between 45 and 89%. Allowing movement raised the predicted survival of sturgeon under all conditions to above 90% as sturgeon avoided areas with low habitat quality. ?? 2003 Elsevier B.V. All rights reserved.

  8. Effects of Dietary Garlic Extracts on Whole Body Amino Acid and Fatty Acid Composition, Muscle Free Amino Acid Profiles and Blood Plasma Changes in Juvenile Sterlet Sturgeon, Acipenser ruthenus.

    Science.gov (United States)

    Lee, Dong-Hoon; Lim, Seong-Ryul; Ra, Chang-Six; Kim, Jeong-Dae

    2012-10-01

    A series of studies were carried out to investigate the supplemental effects of dietary garlic extracts (GE) on whole body amino acids, whole body and muscle free amino acids, fatty acid composition and blood plasma changes in 6 month old juvenile sterlet sturgeon (Acipenser ruthenus). In the first experiment, fish with an average body weight of 59.6 g were randomly allotted to each of 10 tanks (two groups of five replicates, 20 fish/tank) and fed diets with (0.5%) or without (control) GE respectively, at the level of 2% of fish body weight per day for 5 wks. Whole body amino acid composition between the GE and control groups were not different (p>0.05). Among free amino acids in muscle, L-glutamic acid, L-alanine, L-valine, L-leucine and L-phenylalanine were significantly (pexperiment, the effects of dietary garlic extracts on blood plasma changes were investigated using 6 month old juvenile sterlet sturgeon averaging 56.5 g. Fish were randomly allotted to each of 2 tanks (300 fish/tank) and fed diets with (0.5%) or without (control) GE respectively, at the rate of 2% of body weight per day for 23 d. At the end of the feeding trial, blood was taken from the tail vein (n = 5, per group) at 1, 12, and 24 h after feeding, respectively. Blood plasma glucose, insulin and the other serological characteristics were also measured to assess postprandial status of the fish. Plasma glucose concentrations (mg/dl) between two groups (GE vs control) were significantly (p0.05) were noticed at 12 h (74.6 vs 73.0). Plasma insulin concentrations (μIU/ml) between the two groups were significantly (p<0.05) different at 1 (10.56 vs 5.06) and 24 h (32.56 vs 2.96) after feeding. The present results suggested that dietary garlic extracts could increase dietary glucose utilization through the insulin secretion, which result in improved fish body quality and feed utilization by juvenile sterlet sturgeon.

  9. LES FRAYÈRES POTENTIELLES DE L’ESTURGEON EUROPÉEN ACIPENSER STURIO L. 1758 DANS LE BASSIN GARONNE-DORDOGNE. MÉTHODES D’INVESTIGATION, ÉTAT ACTUEL ET PERSPECTIVES.

    Directory of Open Access Journals (Sweden)

    JEGO S.

    2002-04-01

    Full Text Available Dans le cadre du programme de restauration de l’esturgeon européen Acipenser sturio L. 1758, nous avons recensé et caractérisé l’ensemble des frayères potentielles de cette espèce sur les fleuves Garonne et Dordogne. L’objectif de ce travail était de réaliser un premier bilan sur l’état actuel de ces zones et d’évaluer leur possible utilisation comme frayère. Avant ce travail, les seules données disponibles étaient constituées par une liste de frayères et de zones de pêche de géniteurs répertoriées en 1952 et 1980 par enquêtes auprès des pêcheurs. Une analyse des données publiées sur les autres espèces d’esturgeons a permis de cerner les principales caractéristiques physiques d’une frayère d’esturgeons. En croisant les informations issues de ces 2 sources, historique et bibliographique, nous avons retenu une liste de sites qui ont ensuite été caractérisés lors de campagnes sur le terrain. Cette caractérisation a porté sur la bathymétrie, le courant, la nature du substrat, la position dans le paysage et les impacts anthropiques immédiats. Les résultats de cette étude ont montré que la majorité des 28 sites étudiés répondait aux caractéristiques d’une frayère d’esturgeon en terme de courant, profondeur et substrat. Ils pouvaient donc être considérés comme frayères potentielles et leur capacité d’accueil était suffisante à moyen terme. Néanmoins il apparaît nécessaire de protéger réglementairement l’ensemble de ces sites afin de les soustraire aux impacts négatifs d’activité anthropiques.

  10. 西伯利亚鲟侧线神经丘发育过程的观察%OBSERVATION ON THE DEVELOPMENT OF THE LATERAL LINE NEUROMAST OF SIBERIAN STURGEON (ACIPENSER BAERII)

    Institute of Scientific and Technical Information of China (English)

    程千千; 施志仪; 陈晓武; 宋佳坤; 轩兴荣

    2011-01-01

    研究对西伯利亚鲟(Acipenser baerii)的胚后幼鱼进行石蜡切片HE染色,同时利用荧光染料DiA[4-(4-Diethylaminostyryl)-1-methylpyridinium iodide]对侧线管中侧线神经丘毛细胞特异性标记的特点,示踪了西伯利亚鲟胚后仔鱼各个时期侧线神经丘分化发育的过程.结果显示,西伯利业鲟侧线管内侧线神经丘毛细胞如纤毛状,呈竖立紧密排列.出膜3d仔鱼眼眶后神经基板发育分化活动剧烈,出膜10d的仔鱼眼眶后方的神经基板分化出眼眶上下侧线神经丘的两个分支,同时眼眶后神经基板进一步向后分化发育在眼眶后部形成躯干侧线神经丘,但整个侧线神经丘还未完全发育完成,待出膜15d时,眼眶上下和躯干侧线神经丘已基本发育完全,出膜22d的仔鱼侧线神经丘发育基本完成.研究为今后深入研究西伯利亚鲟侧线发育过程中的神经分化发育、细胞迁移奠定了初步形态学基础.%Acipenseriformes fish is a kind of the ancient chondrichthyes fish, and Siberian sturgeon (Acipenser baerii) plays an important part in the evolutionary history of vertebrates. Lateral line neuromast is the key part of the lateral line system-a very important sense organ of fish. Therefore, it is necessary to pay attention to the development of the lateral line neuromast of the Siberian sturgeon. In order to observing the morphology and tracking the development of lateral line neuromast of the Siberian sturgeon larvae in the different development periods after hatching. The 5μm of the paraffin sections of the adult fish of the Siberian sturgeon were prepared and then stained with HE. Meanwhile, the Siberian sturgeon larvae in different periods after hatching stained with 10μmol/L DiA [4-(4-Diethylaminostyryl)-lmethylpyridinium iodide] which can be used as the neuromast specific markers. The results showed morphology of the neuromast in the lateral line canal: The hair cells erected and arranged closely

  11. The bacteria distribution and sterilization effect of four kinds of natural baits for cultured Acipenser sinensis%养殖中华鲟四种天然饵料的细菌分布及灭菌效果

    Institute of Scientific and Technical Information of China (English)

    张艳珍; 张晓雁; 王彦鹏

    2014-01-01

    To prevent the bacterial disease caused by the bait in cultured Chinese sturgeon ( Acipenser sinensis) in Beijing aquarium, the bacterial distributions and sterilization effects of four kinds of live and frozen baits , Hexagrammos otakii, Acanthogobius ommaturus, Penaeus Vannamei and Malltus villosus, were studied.The results showed that two types of dominant bacteria were discovered with serious pathogenicity , belong to the Aeromonas and Acinetobacter.The species of bacteriain live baits and frozen baits were different.The dominant bacteria in live baits were A.hydrophila and two kinds of Non-Fermentative Gram-negative Bacteria , one was A.baumanii.The dominant bacteria in frozen baits were A.lwoffii, A.hydrophila and A.Verona.The treatment methods of live and frozen baits included disinfection , temporarily raised , fro-zen and ultraviolet sterilization.For Hexagrammos otakii, the sterilization effect was not obvious.After 3days raising in a suitable pool , the flora structure tended to be stable , while the ultraviolet sterilization could reduce the total number of bacteria, but could not kill the dominant bacterial pathogens.For Acanthogobius ommaturus, the species of bacteria changed obviously after 1 d, 4 d, 40 d and 110 d freezing.The dominant bacteria were stable in differentfreezingdays.Also, the ultraviolet sterilization could be stable , but could not kill the dominant bacterial patho-gens.For Penaeus Vannamei and Malltus villosus, the ultraviolet sterilization could reduce the numbers of bacteria and kill part of the dominant bacterial pathogens.%为预防北京海洋馆养殖中华鲟( Acipenser sinensis )因饵料引起的细菌性疾病暴发,对鲜活大泷六线鱼(Hexagrammos otakii)、冷冻斑尾刺虾虎鱼(Acanthogobius ommaturus)、南美白对虾(Penaeus Vannamei)和多春鱼( Malltus villosus)的细菌分布及不同方式灭菌效果进行了研究。结果显示:饵料优势菌类型为致病力较强的2类条

  12. Early Astronomy

    Science.gov (United States)

    Thurston, Hugh

    The earliest investigations that can be called scientific are concerned with the sky: they are the beginnings of astronomy. Many early civilizations produced astronomical texts, and several cultures that left no written records left monuments and artifacts-ranging from rock paintings to Stonehenge-that show a clear interest in astronomy. Civilizations in China, Mesopotamia, India and Greece had highly developed astronomies, and the astronomy of the Mayas was by no means negligible. Greek astronomy, as developed by the medieval Arab philosophers, evolved into the astronomy of Copernicus. This displaced the earth from the central stationary position that almost all earlier astronomies had assumed. Soon thereafter, in the first decades of the seventeenth century, Kepler found the true shape of the planetary orbits and Galileo introduced the telescope for astronomical observations.

  13. Fish community structure in intertidal area of Acipenser sinensis Natural Reserve in Yangtze River estuary%长江口中华鲟自然保护区潮间带鱼类群落结构

    Institute of Scientific and Technical Information of China (English)

    杨刚; 洪巧巧; 张涛; 侯俊利; 智玉龙; 庄平; 章龙珍

    2012-01-01

    为深入了解鱼类对潮间带水域的利用,2010年5月、8月、11月在长江口中华鲟自然保护区潮间带水域进行了插网调查.结果表明:调查期间共出现28种鱼类,隶属于10目16科,鲤形目种类最多,其次为鲈形目;群落优势种为中国花鲈(Lateolabrax maculates)、鲅(Liza haematocheila)和窄体舌鳎(Cynoglossus gracilis);长江口中华鲟自然保护区潮间带鱼类群落可以分为河口定居鱼类、海洋偶见鱼类、降海洄游鱼类、溯河洄游鱼类、海洋洄游鱼类和淡水鱼类6种生态类群,其中河口定居鱼类和海洋洄游鱼类占据明显优势.对调查水域鱼类群落进行聚类分析,结果表明秋季和春夏季差异显著,(鲮)、中国花鲈、斑尾刺虾虎鱼(Acanthogobius ommaturus)是对季节差异贡献最大的3种鱼类.主成分分析结果表明,夏季鱼类群落主要受到海洋洄游鱼类的影响,而秋季主要受到河口定居鱼类的影响,这2种鱼类的幼鱼在不同季节利用潮间带水域索饵肥育可能是造成季节差异的主要原因.%In order to understand the utilization of intertidal water area by fishes, an investigation with fyke was conducted on the fish community structure in the intertidal area of Acipenser sinensis Natural Reserve in Yangtze River estuary in May, August and November 2010. A total of 28 fish species belonging to 16 families and 10 orders were collected, among which, Lateolabrax maculates , Liza haematocheila, and Cynoglossus gracilis were the dominant species. Cypriniformes had the largest species number, followed by Perciformes. The fish communities could be classified into 6 ecological groups, i. e. , estuarine species, marine stragglers, catadromous species, anadro-mous species, marine migrants, and freshwater species, and the estuarine species and marine migrants took up distinct advantage. Cluster analysis showed that there was a significant difference in the fish communities in autumn and in spring

  14. 饲料中不同糖源对杂交鲟幼鱼生长性能、血清生化指标和肌肉营养成分的影响%Effects of dietary carbohydrate sources on growth, feed utilization and haematological parameters of juvenile hybrid sturgeon Acipenser baeri ♀× A. schrenckii ♂

    Institute of Scientific and Technical Information of China (English)

    宋娇; 姜海波; 姜志强; 陈立侨; 王庆奎; 袁海文; 杨家和; 姚俊杰

    2016-01-01

    An 8-week feeding trial was conducted to investigate the effects of different carbohydrate sources on growth, feed utilization, haematological parameters and muscle composition of juvenile hybrid sturgeon Acipenser baeri♀×A. schrenckii ♂(initial weight, 31. 88 g±1. 96 g). In the experiment, the juvenile hybrid sturgeon was fed five experimental diets containing 20% of glucose, sucrose, dextrin, corn starch and wheat starch. The results showed that there were no significant differences in survival rate and daily food intake rate in the hybrids fed the di-ets containing different carbohydrate sources ( P>0 . 05 ) . The juvenile hybrid sturgeon fed the diets containing glu-cose had significantly lower final body weight, weight gain rate, specific growth rate and protein deposition rate and higher food conversion ratio than the juveniles fed the control diet ( P0 . 05 ) . There was significantly higher serum glu-cose level in the hybrids fed the diets containing glucose than that in the others, without significant differences be-tween sucrose, dextrin and corn starch groups (P>0. 05),in which there was significantly higher than in the wheat starch group ( P0. 05). However, the minimal liver glycogen content was observed in dextrin group, significantly lower than in the hybrids in glucose and wheat starch groups ( P0 . 05 ) . The findings indicated that corn starch and wheat starch were the optimal dietary carbohydrate sources for juvenile hybrid sturgeon under the conditions in present experiment.%为探讨不同糖源对鲟鱼生长、饲料利用、血清生化指标和肌肉营养组成的影响,共配制5种含有不同糖源(葡萄糖、蔗糖、糊精、玉米淀粉、小麦淀粉)的等氮、等脂试验饲料,饲养初始体质量为(31.88±1.96) g的杂交鲟Acipenser baerii♀×Acipenser schrenckii♂幼鱼8周。结果表明:各试验组的成活率和日摄食率无显著性差异(P>0.05);葡萄糖组终末体质量、增重率、特定生长

  15. Length changes in white sturgeon larvae preserved in ethanol or formaldehyde

    Science.gov (United States)

    Bayer, J.M.; Counihan, T.D.

    2001-01-01

    We examined the effects of two preservatives on the notochord and total lengths of white sturgeon (Acipenser transmontanus) larvae. White sturgeon larvae that were one, seven, and 14 days old were measured live and then preserved in 95% ethanol or 10% formaldehyde. Length changes were then determined at 20 and 95 days after preservation. We found mean length changes ranging from 0.4% to 3.4% shrinkage. Length changes varied with preservative, age of larvae, and length of time preserved. Constant length correction factors are provided for 10% formaldehyde or 95% ethanol valid for larvae between 1 and 14 days old preserved for less than 100 days.

  16. Accumulation and evaluation of heavy metals Cu, Cd and Hg in prey species of juvenile Chinese sturgeons (Acipenser Sinensis) in the Yangtze River estuary, China%长江口中华鲟幼鱼主要饵料生物体内重金属Cu、Cd和Hg的积累与评价

    Institute of Scientific and Technical Information of China (English)

    张慧婷; 庄平; 章龙珍; 侯俊利; 张涛; 闫文罡; 冯广朋

    2011-01-01

    In order to discuss the different biological absorption of Gu, Cd and Hg, and evaluate them in food organisms for juvenile Acipenser Sinensis in Yangtze estuary, Macrobraohium nipponense, Acetes chinensis,Taenioides rubicundus, Chaeturichthys stigrnatias and Cynoglossus gracilis were collected and analyzed.Results showed that, individual pollution index (Pi) of Gu in shrimps was less than 0.5, Pi of Cu in fish was more than 0.5, and Pi of Cd and Hg in all selected prey species were more than 1. This indicated that the 5 selected prey species for juvenile Acipenser Sinensis were all contaminated by heavy metals to different extent.The shrimps were contaminated more seriouslly than fish. Compared with the historical data, the heavy metal pollution of fish in Yangtze estuary showed aggravating trend. Heavy metal pollution has been threatening juvenile Chinese sturgeon which migrate to sea via Yangtze estuary.%为评价重金属污染对长江口中华鲟幼鱼生长的影响,在长江口水域采集了日本沼虾(Macrobraohium nipponense)、中国毛虾(Acetes chinensis)、狼牙鳗虾虎鱼(Taenioides rubicundus)、矛尾虾虎鱼(Chaeturichthys stigmatias)、窄体舌鳎(Cynoglossus gracilis)等5种中华鲟幼鱼重要饵料生物,研究了Cu、Cd、Hg3种重金属元素在这些饵料生物体内的积累特征,评价了饵料生物受重金属污染的程度.结果显示,虾类Cu的单项污染指数(P)均大于0.5,鱼类Cu的P均小于0.5;5种饵料生物Cd和Hg的P均大于1.表明它们均不同程度受到重金属污染,虾类的重金属污染程度比鱼类严重.与历史资料比较发现,长江口鱼虾的重金属污染存在加重趋势,重金属污染已对洄游人海的中华鲟幼鱼构成威胁.

  17. Changes of enzyme activity in blood and liver of juvenile Chinese sturgeon (Acipenser sinensis) during starvation%饥饿期间中华鲟幼鱼血液与肝脏酶活力的变化

    Institute of Scientific and Technical Information of China (English)

    冯广朋; 庄平; 章龙珍; 黄晓荣; 刘鉴毅; 段明; 侯俊利

    2011-01-01

    将中华鲟幼鱼持续饥饿43 d,每隔6 d采样1次,研究饥饿期间中华鲟幼鱼血液与肝脏7项酶活力指标的变化.结果表明,饥饿期间中华鲟幼鱼血液丙氨酸转氨酶活力波动范围为42.1~134.6 U/L,在第13天与第37天均出现显著下降;天冬氨酸转氨酶活力在饥饿19 d后出现下降,最低值与最高值分别为310.1±52.4 U/L与420.8±83.4 U/L;溶菌酶活力呈现上升趋势,饥饿43 d组与饥饿前期的4个组之间具有显著差异;总抗氧化能力在饥饿19 d后下降至较低水平,饥饿13 d组显著高于饥饿37 d组;肝脏Na-K-ATP酶活力在饥饿前期下降,在饥饿37 d后显著升高,与饥饿前期的4个组之间具有显著差异;乳酸脱氢酶活力在饥饿13 d后显著下降,波动范围为5.101~3.154 U/g;碱性磷酸酶活力呈现上升趋势,饥饿19~43 d的5个组显著高于饥饿1 d组.从总体上看,中华鲟幼鱼生理指标在饥饿19~25 d后产生较大变化,这可能与其新陈代谢与能量供应水平下降有关,在人工养殖与救护工作中应防止中华鲟幼鱼受到长期的饥饿胁迫.%The effects of starvation on the enzyme activity in blood and liver of juvenile Chinese sturgeon (Acipenser sinensis) were studied. Blood and liver were sampled every six days during 43 days of starvation.The activity of alanine aminotransferase decreased significantly after 13 and 37 days of starvation. The levels ranged from 42. 1 to 134. 6 U/L. The activity of aspartate aminotransferase decreased after 19 days of starvation. The levels ranged from 310. 1 ± 52.4 to 420.8 ± 83.4 U/L. The activity of lysozyme increased generally and there were significant differences between 43-day starvation group and 4 starvation groups of 1 -19 days. Total antioxidative capacity remained low level after 19-day starvation and the level in 13-day starvation group was significantly higher than that of 37-day starvation group. The activity of Na + -K + -ATPase decreased first and then

  18. 中华鲟初次全人工繁殖的特性研究%THE REPRODUCTIVE BIOLOGY OF FIRST FILIAL GENERATION OF ACIPENSER SINENSIS GROWING UP IN THE FRESHWATER ENVIRONMENT

    Institute of Scientific and Technical Information of China (English)

    郭柏福; 常剑波; 肖慧; 朱滨; 万建义; 田家元; 舒德斌

    2011-01-01

    Chinese sturgeon (Acipenser sinensis Gary) is an endangered anadromous species in the IUCN Red List. It was characterized as the national level key protected animal of China in 1988 and under the protection of CITES Appendix II in 1998. In order to realize the artificial propagation, mature Chinese sturgeons were captured below the Gezhouba Dam in the Yangtze River every year since 1982. And the induction of wild Chinese sturgeon succeeded in 1984. From then on, the artificially reproduced larvae of Chinese sturgeon were released every year. With the declining of the population, capture of wild Chinese sturgeon was prohibited by the government from 2008, so induction of cultured sturgeons was necessary to increase the quantity of larvae in the Yangtze River. From 1987 to 1997, many progenies of induced Chinese sturgeons captured from the Yangtze River were tried to culture in complete freshwater environment in Chinese sturgeon Institute. Twenty four growing-up individuals were selected for the attempts of the artificial propagation study in 2006. We successfully made the gonads of these individuals develop into mature in freshwater environment via controlling culture environment temperature, lowering temperature to induce and supplying particular nutrient in 2009. The gonads were monitored by the combination of ultrasound detection and manual puncture detection. Primary biological data of egg, such as egg diameter and egg weight, the migration of the egg polar nucleus, were checked to confirm whether the female were mature and the microscope was used to check whether the male were mature. There were totally eight individuals whose gonads reached Phase III in 2008 and 2009. We found two mature brood fish (No. 6B7A and 391D) suitable to conduct artificial propagation via checking gonads in September 2009, and then we tried to conduct the first artificial induction in 29 September 2009, and part of the semen were Cryopreservation. In 22 November 2009, we confirmed

  19. Autism: Why Act Early?

    Science.gov (United States)

    ... What's this? Submit Button Past Emails CDC Features Autism: Why Act Early? Language: English Español (Spanish) Recommend ... helped the world make sense." Florida teenager with Autism Spectrum Disorder "Because my parents acted early, I ...

  20. Early Retirement Programs.

    Science.gov (United States)

    Everett, Peter W.

    1984-01-01

    Early retirement programs offer individuals an alternative to the work ethic while allowing them to maintain job security. Examples are given of several early, partial, and phased retirement programs currently being used in universities and public school systems. (DF)

  1. Optimizing Early Retirement Decisions.

    Science.gov (United States)

    2007-11-02

    the military. The U.S. Army’s early retirement program is a temporary one designed to allow some soldiers to leave the service prior to 20 years of...whether it makes financial sense for an officer to select early retirement . A spreadsheet formulation is developed and used to indicate if and when...an officer should select early retirement . The program investigates the decision that various civilian salary levels and various assumed discount rates.

  2. 淡水和半咸水条件下中华鲟幼鱼鳃上皮泌氯细胞的形态特征与数量分布%Characters of morphology,distribution and quantity of branchial chloride cells of juvenile Acipenser sinensis acclimated in freshwater and brackish water

    Institute of Scientific and Technical Information of China (English)

    赵峰; 杨刚; 张涛; 王妤; 庄平

    2016-01-01

    To understand the adaptive changes of branchial chloride cells (CCs)in juvenile Chinese sturgeon Acipenser sinensis in the Yangtze Estuary,juveniles were acclimated to 0 (freshwater,FW)and brackish water (salinity 15,BW)for 60 days.Histological and ultrastructural observation on branchial CCs were comparatively studied in juveniles adapted either in FW or BW.Results showed that:CCs were slightly oval, and mainly distributed in the base of lamellae and interlamellar regions of filaments.When juveniles were adapted in BW,the number and size of branchial CCs on filaments increased significantly.However,there was no change on number of CCs,and there was a significant increase on size of CCs on lamellae.The morphology of CCs on filaments and lamellae did not change in fish adapted to FW or BW.Apical opening of CCs was largely classified into the following three types:Ⅰ,convex type;Ⅱ,concave type;Ⅲ,deep-hole type.In FW,apical opening of CCs on juvenile Chinese surgeon gills presented as type Ⅰ and Ⅱ,and no type Ⅲ was found.After the fish was adapted in BW,apical opening of CCs on juvenile gills was mainly type Ⅲ, and a small amount of type Ⅰ and Ⅱ apical opening appeared.The increase of number and size of branchial CCs on filaments and the morphological changes of apical opening of CCs is the adapting adjustment of juvenile Acipenser sinensis for osmoregulation and maintaining osmotic balance.%为了探讨中华鲟幼鱼进入长江口半咸水环境后,渗透压适应调节过程中鳃上皮泌氯细胞的适应性变化,将幼鱼在淡水(盐度0)和半咸水(盐度15)两种条件下驯养60 d,利用光镜和扫描电镜技术对比分析鳃上皮泌氯细胞的形态、分布与数量特征.结果表明:幼鱼鳃上皮泌氯细胞主要集中分布于鳃小片基部和鳃小片之间的鳃丝上,细胞略呈椭圆形.半咸水条件下,幼鱼鳃丝上皮泌氯细胞数量和大小显著增加,鳃小片上皮泌氯细胞数量则未发生改变,但

  3. Effects of chronic crowding stress on growth, feeding, and behavior in Chinese sturgeon Acipenser sinensis F2 juveniles%中华鲟幼鱼对慢性拥挤胁迫的生长、摄食及行为反应

    Institute of Scientific and Technical Information of China (English)

    张建明; 郭柏福; 高勇

    2013-01-01

      设置低、中、高3个初始养殖密度(1 g/L、4 g/L、8 g/L),进行40 d的养殖实验,研究慢性拥挤胁迫对子二代中华鲟(Acipenser sinensis Gray)幼鱼生长、摄食及行为的影响。研究表明,慢性拥挤胁迫对子二代中华鲟的生长和摄食有显著影响,体质量、体质量特定生长率、体长特定生长率、日增重随着养殖密度的升高显著降低(P<0.05),实验结束时,高密度组肥满度显著低于中、低密度组(P<0.05);各实验组的摄食率随着养殖密度的升高而降低,饵料系数随着养殖密度的升高而升高(P<0.05)。慢性拥挤胁迫对子二代中华鲟的行为也有显著的影响,随着养殖密度的增大,表现为呼吸频率、摆尾频率和游动速度显著加快等应急行为。研究结果表明高养殖密度对中华鲟的生长、摄食和行为存在显著的负面作用,不利于中华鲟幼鱼生长发育。%Chinese sturgeon(Acipenser sinensis) are an endangered anadromous species listed on the IUCN Red List. The species was characterized as a national level key protected animal of China in 1988 and fell under the protection of CITES Appendix II in 1998. Because of their perilous status, there is considerable interest in artifi-cial breeding and species conservation. To aid development of conservation breeding programs, we evaluated the effects of chronic crowding stress on growth, feeding, and behavior in F2 Chinese sturgeon. The fish were cultured at three stocking densities (low:1 g/L, medium:4 g/L, high:8 g/L) for 40 d to evaluate the influence of stocking density on growth, feeding and behavior. Density had a significant effect on growth and feeding. The body weight, growth efficiency, specific growth rate, and daily weight gain decreased significantly as stocking density increased. The feeding rate for the experimental groups also decreased as the stocking density increased and the feed conver-sion ratio increased as the

  4. The effects of three probiotics on the growth and immune system of hybrid sturgeon (Huso dauricus♀×Acipenser schrenckii♂)%三种微生态制剂对杂交鲟(达氏鳇♀×史氏鲟♂)生长性能及免疫机能的影响

    Institute of Scientific and Technical Information of China (English)

    李斌; 杨军; 黄建华; 韩文利; 何洪超

    2014-01-01

    通过在杂交鲟(达氏鳇(Huso dauricus)♀×史氏鲟(Acipenser schrenckii)♂)((50.26±0.55)g)饲料中分别添加2000 mg/kg的枯草芽孢杆菌( Bacillus subtilis)、光合细菌和酵母多糖三种微生态制剂,研究其对杂交鲟的生长指标、血液指标和消化酶活性的影响。结果显示,与对照组相比,添加微生态制剂明显提高了杂交鲟的存活率,其平均增重率分别提高了31.95%、21.06%、45.09%,饵料系数分别降低了22.04%、7.50%、28.49%,蛋白质转化效率分别提高了22.90%、13.76%、26.61%;各项血液指标得到明显优化,其中,红细胞和白细胞数目增加,白细胞组成成分变化不大,血细胞脆性降低,血沉升高;此外,饲料中添加微生态制剂,提高了淀粉酶、脂肪酶及蛋白酶的活性。研究表明,三种微生态制剂中,酵母多糖对杂交鲟的作用效果最明显。%We evaluated the effects dietary supplementation with three different probiotics , Bacillus subtilis, photosynthetic bacteria and yeast polysaccharide on growth index , blood index and digestive enzyme activity of the hybrid sturgeon ( Huso dauricus♀ ×Acipenser schrenckii♂)((50.26 ±0.55)g).The hybrid sturgeons were randomly assigned to four groups containing one control group without probiotic and three experimental groups fed the same diet with 0.2% each probiotic , respectively.The results showed that the survival rate of experimental groups was obviously higher than control group . Mean weight gain ratio of the hybrid sturgeon increased by 31.95%, 21.06%and 45.09%, the feed conversion ratio de-creased by 22.04%, 7.50%and 28.49%and the quantity of the protein conversion was improved by 22.90%, 13.76%and 26.61%, respectively, compared with the control group .Additionally, the blood indicators of hybrid sturgeons were obviously optimized , of which the amount of red and white blood cells was increasing and

  5. The immunocross-reaction between pathogenic Aeromonas hydrophila isolated from Siberian sturgeon Acipenser baerii and other three Aeromonas strains%西伯利亚鲟嗜水气单胞菌与其它3株气单胞菌间的免疫交叉反应

    Institute of Scientific and Technical Information of China (English)

    姜有声; 杨倩; 杨先乐; 吕利群; 邱军强

    2012-01-01

    The immunological characteristics of four Aeromonas strains like pathogenic bacteria strain Xl(Aeromonas hydrophlia) isolated from Siberian sturgeon (Acipenser baerii) suffering with bacterial septicaemia, pathogenic bacteria strain XL2-T strain (Aeromonas caviae ) isolated from the sturgeon septicemia, pathogenic strain Wl (Aeromonas sobria) and non-pathogenic M3 strain (Aeromonas hydrophlia) , were detected through the cross-reactions between four Aeromonas strains and antiserums by indirect immunofluoresence assay. The results showed that the pathogenic XI strain, XL2 -T strain and Wl strain had strong cross reactions, and weak cross reactions were found on non-pathogenic M3 strain with other three pathogenic strains.%采用间接免疫荧光技术分析了西伯利亚鲟细菌性败血症致病菌嗜水气单胞菌(Aeromonas hydrophlia)X1菌株、豚鼠气单胞菌(Aeromonas caviae)XL2-T菌株、致病性温和气单胞菌(Aeromonas sobria)W1菌株与无致病性嗜水气单胞菌(Aeromonas hydrophlia)M3菌株等水产养殖主要病原菌与抗血清之间的免疫交叉反应.结果显示具有致病性的同属菌株X1菌株、XL2-T菌株、W1菌株交叉反应程度较大,说明这3株菌表面存在较多相同抗原决定簇.而无致病性菌株M3与其他3株致病性菌株免疫交叉反应程度较小.

  6. Early Retirement Payoff

    Science.gov (United States)

    Fitzpatrick, Maria D.; Lovenheim, Michael F.

    2014-01-01

    As public budgets have grown tighter over the past decade, states and school districts have sought ways to control the growth of spending. One increasingly common strategy employed to rein in costs is to offer experienced teachers with high salaries financial incentives to retire early. Although early retirement incentive (ERI) programs have been…

  7. Early Option Exercise

    DEFF Research Database (Denmark)

    Heje Pedersen, Lasse; Jensen, Mads Vestergaard

    A classic result by Merton (1973) is that, except just before expiration or dividend payments, one should never exercise a call option and never convert a convertible bond. We show theoretically that this result is overturned when investors face frictions. Early option exercise can be optimal when...... it reduces short-sale costs, transaction costs, or funding costs. We provide consistent empirical evidence, documenting billions of dollars of early exercise for options and convertible bonds using unique data on actual exercise decisions and frictions. Our model can explain as much as 98% of early exercises...

  8. Early Option Exercise

    DEFF Research Database (Denmark)

    Jensen, Mads Vestergaard; Heje Pedersen, Lasse

    2016-01-01

    A classic result by Merton (1973) is that, except just before expiration or dividend payments, one should never exercise a call option and never convert a convertible bond. We show theoretically that this result is overturned when investors face frictions. Early option exercise can be optimal when...... it reduces short-sale costs, transaction costs, or funding costs. We provide consistent empirical evidence, documenting billions of dollars of early exercise for options and convertible bonds using unique data on actual exercise decisions and frictions. Our model can explain as much as 98% of early exercises...

  9. Early Head Start Evaluation

    Data.gov (United States)

    U.S. Department of Health & Human Services — Longitudinal information from an evaluation where children were randomly assigned to Early Head Start or community services as usual;direct assessments and...

  10. Biogeochemistry: Early phosphorus redigested

    Science.gov (United States)

    Poulton, Simon W.

    2017-02-01

    Atmospheric oxygen was maintained at low levels throughout huge swathes of Earth's early history. Estimates of phosphorus availability through time suggest that scavenging from anoxic, iron-rich oceans stabilized this low-oxygen world.

  11. Early childhood aggression

    OpenAIRE

    Alink, Lenneke Rosalie Agnes

    2006-01-01

    In this thesis the development, stability, and correlates of early childhood aggression were investigated. The normative development was examined in a general population sample using questionnaires completed by the parents of 12-, 24-, and 36-month-old children and again one year later. Results showed an early childhood aggression curve, with increasing rates of aggression in the second year of life and decreasing rates in the fourth year. One-year stabilities were moderate for 12-month-olds ...

  12. Embracing early literacy indicators

    DEFF Research Database (Denmark)

    Broström, Stig; Hansen, Ole Henrik; Jensen, Anders Skriver

    2010-01-01

    Abstract til paper om early literacy indikatorer. Det paper abstractet er knyttet til var en del af et inviteret, selvorganiseret symposium som afrapporterede EASE-projektet (www.ease-eu.com) på OMEP's 26. verdenskongres.......Abstract til paper om early literacy indikatorer. Det paper abstractet er knyttet til var en del af et inviteret, selvorganiseret symposium som afrapporterede EASE-projektet (www.ease-eu.com) på OMEP's 26. verdenskongres....

  13. Early Mover Advantages

    OpenAIRE

    Bijwaard, Govert; Janssen, Maarten; Maasland, Emiel

    2005-01-01

    This paper analyzes empirically whether and if so to what extent later entrants in the European mobile telephony industry have a disadvantage vis-à-vis incumbents and early mover entrants. To analyze this question a dynamic model of market share development and a series of static models are considered. There is clear evidence of early mover advantage, mainly caused by the influence of the penetration rate: it pays to enter when still few people have acquired a mobile telephone. Another import...

  14. Early Prediction of Preeclampsia

    Directory of Open Access Journals (Sweden)

    Leona C. Poon

    2014-01-01

    Full Text Available Effective screening for the development of early onset preeclampsia (PE can be provided in the first-trimester of pregnancy. Screening by a combination of maternal risk factors, uterine artery Doppler, mean arterial pressure, maternal serum pregnancy-associated plasma protein-A, and placental growth factor can identify about 95% of cases of early onset PE for a false-positive rate of 10%.

  15. How early is early dark energy?

    CERN Document Server

    Pettorino, Valeria; Wetterich, Christof

    2013-01-01

    We investigate constraints on early dark energy (EDE) from the Cosmic Microwave Background (CMB) anisotropy, taking into account data from WMAP9 combined with latest small scale measurements from the South Pole Telescope (SPT). For a constant EDE fraction we propose a new parametrization with one less parameter but still enough to provide similar results to the ones previously studied in literature. The main emphasis of our analysis, however, compares a new set of different EDE parametrizations that reveal how CMB constraints depend on the redshift epoch at which Dark Energy was non negligible. We find that bounds on EDE get substantially weaker if dark energy starts to be non-negligible later, with early dark energy fraction Omega_e free to go up to about 5% at 2 sigma if the onset of EDE happens at z < 100. Tight bounds around 1-2% are obtained whenever dark energy is present at last scattering, even if its effects switch off afterwards. We show that the CMB mainly constrains the presence of Dark Energy ...

  16. Early bile duct cancer

    Institute of Scientific and Technical Information of China (English)

    Jae Myung Cha; Myung-Hwan Kim; Se Jin Jang

    2007-01-01

    Bile duct cancers are frequently diagnosed as advanced diseases. Over half of patients with advanced bile duct cancer present with unresectable malignancies and their prognosis has been very poor even after curative resections. Although there has been a need to diagnose bile duct cancer at its early stage, it has been a difficult goal to achieve due to our lack of knowledge regarding this disease entity. Early bile duct cancer may be defined as a carcinoma whose invasion is confined within the fibromuscular layer of the extrahepatic bile duct or intrahepatic large bile duct without distant metastasis irrespective of lymph node involvement. Approximately 3%-10% of resected bile duct cancers have been reported to be early cancers in the literature. The clinicopathological features of patients with early bile duct cancer differ from those of patients with advanced bile duct cancer, with more frequent asymptomatic presentation, characteristic histopathological findings,and excellent prognosis. This manuscript is organized to emphasize the need for convening an international consensus to develop the concept of early bile duct cancer.

  17. Early Reionization in Cosmology

    CERN Document Server

    Durrer, R

    1993-01-01

    The cosmic microwave background (CMB) anisotropies have turned out to represent one of the most stringent 'bottle necks' for scenarios of large scale structure formation. As a possibility to relax this constraint, it has been proposed that early reionization can damp CMB fluctuations on small scales due to photon diffusion in the ionized plasma. As an example, I investigate the recently proposed scenario with cold dark matter (CDM) and texture seeds. There, an analysis of CMB anisotropies shows that early reionization is a crucial ingredient for this scenario. Without damping, the small scale anisotropies would dominate and exceed observed limits. In this paper I present analytical and numerical results for the amount of damping due to early reionization for CMB perturbations induced by a collapsing texture. Furthermore, the spectral distortion of the CMB due to Compton scattering of the hotter plasma electrons is calculated. Next I discuss the physical processes which lead to a system of coupled ordinary dif...

  18. Defining early mycosis fungoides.

    Science.gov (United States)

    Pimpinelli, Nicola; Olsen, Elise A; Santucci, Marco; Vonderheid, Eric; Haeffner, Andreas C; Stevens, Seth; Burg, Guenter; Cerroni, Lorenzo; Dreno, Brigitte; Glusac, Earl; Guitart, Joan; Heald, Peter W; Kempf, Werner; Knobler, Robert; Lessin, Stuart; Sander, Christian; Smoller, Bruce S; Telang, Gladys; Whittaker, Sean; Iwatsuki, Keiji; Obitz, Erik; Takigawa, Masahiro; Turner, Maria L; Wood, Gary S

    2005-12-01

    This editorial review summarizes the results of 5 meetings sponsored by the International Society for Cutaneous Lymphoma at which the clinicopathologic and ancillary features of early mycosis fungoides were critically examined. Based on this analysis, an algorithm was developed for the diagnosis of early mycosis fungoides involving a holistic integration of clinical, histopathologic, immunopathologic, and molecular biological characteristics. A novel aspect of this algorithm is that it relies on multiple types of criteria rather than just one, for example, histopathology. Before its finalization, the proposed diagnostic algorithm will require validation and possibly further refinement at multiple centers during the next several years. It is anticipated that a more standardized approach to the diagnosis of early mycosis fungoides will have a beneficial impact on the epidemiology, prognostication, treatment, and analysis of clinical trials pertaining to this most common type of cutaneous lymphoma.

  19. Early detection of psychosis

    DEFF Research Database (Denmark)

    Larsen, T. K.; Melle, I.; Auestad, B.

    2011-01-01

    Background During the last decades we have seen a new focus on early treatment of psychosis. Several reviews have shown that duration of untreated psychosis (DUP) is correlated to better outcome. However, it is still unknown whether early treatment will lead to a better long-term outcome....... This study reports the effects of reducing DUP on 5-year course and outcome.Method During 1997â€"2000 a total of 281 consecutive patients aged >17 years with first episode non-affective psychosis were recruited, of which 192 participated in the 5-year follow-up. A comprehensive early detection (ED) programme...... with public information campaigns and low-threshold psychosis detection teams was established in one healthcare area (ED-area), but not in a comparable area (no-ED area). Both areas ran equivalent treatment programmes during the first 2 years and need-adapted treatment thereafter.Results At the start...

  20. Early Islamic Syria

    DEFF Research Database (Denmark)

    Walmsley, Alan

    After more than a century of neglect, a profound revolution is occurring in the way archaeology addresses and interprets developments in the social history of early Islamic Syria-Palestine. This concise book offers an innovative assessment of social and economic developments in Syria...... for considerable cultural and economic continuity rather than devastation and unrelenting decline. Much new, and increasingly non-elite, architectural evidence and an ever-growing corpus of material culture indicate that Syria-Palestine entered a new age of social richness in the early Islamic period, even...

  1. The Earth's early evolution.

    Science.gov (United States)

    Bowring, S A; Housh, T

    1995-09-15

    The Archean crust contains direct geochemical information of the Earth's early planetary differentiation. A major outstanding question in the Earth sciences is whether the volume of continental crust today represents nearly all that formed over Earth's history or whether its rates of creation and destruction have been approximately balanced since the Archean. Analysis of neodymium isotopic data from the oldest remnants of Archean crust suggests that crustal recycling is important and that preserved continental crust comprises fragments of crust that escaped recycling. Furthermore, the data suggest that the isotopic evolution of Earth's mantle reflects progressive eradication of primordial heterogeneities related to early differentiation.

  2. 75 FR 20830 - Early Learning

    Science.gov (United States)

    2010-04-21

    ... Early Learning AGENCY: Office of the Secretary, Department of Education. ACTION: Notice of public..., is seeking input from State agencies responsible for early learning and development, families..., researchers of early learning, stakeholders who work with early learning and development for young...

  3. Early Adolescent Ego Development.

    Science.gov (United States)

    James, Michael A.

    1980-01-01

    Presented are the theoretical characteristics of social identity in early adolescence (ages 10 to 15). It is suggested that no longer is identity thought to begin with adolescence, but may have its beginnings in the preteen years. The article draws heavily on Eriksonian concepts. (Editor/KC)

  4. Early Childhood Trauma

    Science.gov (United States)

    National Child Traumatic Stress Network, 2010

    2010-01-01

    Early childhood trauma generally refers to the traumatic experiences that occur to children aged 0-6. Because infants' and young children's reactions may be different from older children's, and because they may not be able to verbalize their reactions to threatening or dangerous events, many people assume that young age protects children from the…

  5. Early Developments, 2002.

    Science.gov (United States)

    Winton, Pam, Ed.; Buysse, Virginia, Ed.

    2002-01-01

    This document consists of the three 2002 issues of a journal reporting new research in early child development conducted by the Frank Porter Graham Child Development Center (FPG) at the University of North Carolina at Chapel Hill. Articles in the Winter 2002 issue highlight some current work at FPG on factors that enhance or inhibit social and…

  6. Early malignant syphilis*

    Science.gov (United States)

    Ortigosa, Yara Martins; Bendazzoli, Paulo Salomão; Barbosa, Angela Marques; Ortigosa, Luciena Cegatto Martins

    2016-01-01

    Early malignant syphilis is a rare and severe variant of secondary syphilis. It is clinically characterized by lesions, which can suppurate and be accompanied by systemic symptoms such as high fever, asthenia, myalgia, and torpor state. We report a diabetic patient with characteristic features of the disease showing favorable evolution of the lesions after appropriate treatment. PMID:28300925

  7. Early Mover Advantages

    NARCIS (Netherlands)

    G.E. Bijwaard (Govert); M.C.W. Janssen (Maarten); E. Maasland (Emiel)

    2004-01-01

    textabstractIn this paper we analyze empirically whether and if so to what extent later entrants in the European mobile telephony industry have a disadvantage vis-à-vis incumbents and early mover entrants. To analyze this question we consider a series of static models and a dynamic model of market s

  8. Early childhood aggression

    NARCIS (Netherlands)

    Alink, Lenneke Rosalie Agnes

    2006-01-01

    In this thesis the development, stability, and correlates of early childhood aggression were investigated. The normative development was examined in a general population sample using questionnaires completed by the parents of 12-, 24-, and 36-month-old children and again one year later. Results show

  9. Creativity: The Early Years

    Science.gov (United States)

    Shade, Rick; Shade, Patti Garrett

    2016-01-01

    There is a myth that some people are creative and others are not. However, all children are born creative. They love to explore, ask questions, and are incredibly imaginative. Parents are key in nurturing their child's creativity in the early years. This article offers resources and strategies parents can use at different ages and stages (newborn,…

  10. Early Cosmology Constrained

    CERN Document Server

    Verde, Licia; Pigozzo, Cassio; Heavens, Alan F; Jimenez, Raul

    2016-01-01

    We investigate our knowledge of early universe cosmology by exploring how much additional energy density can be placed in different components beyond those in the $\\Lambda$CDM model. To do this we use a method to separate early- and late-universe information enclosed in observational data, thus markedly reducing the model-dependency of the conclusions. We find that the 95\\% credibility regions for extra energy components of the early universe at recombination are: non-accelerating additional fluid density parameter $\\Omega_{\\rm MR} < 0.006$ and extra radiation parameterised as extra effective neutrino species $2.3 < N_{\\rm eff} < 3.2$ when imposing flatness. Our constraints thus show that even when analyzing the data in this largely model-independent way, the possibility of hiding extra energy components beyond $\\Lambda$CDM in the early universe is seriously constrained by current observations. We also find that the standard ruler, the sound horizon at radiation drag, can be well determined in a way ...

  11. Teaching polymorphism early

    DEFF Research Database (Denmark)

    2005-01-01

    Is it possible to teach dynamic polymorphism early? What techniques could facilitate teaching it in Java. This panel will bring together people who have considered this question and attempted to implement it in various ways, some more completely than others. It will also give participants an oppo...

  12. Introduction to "Early psychosis

    DEFF Research Database (Denmark)

    McGorry, Patrick; Nordentoft, Merete; Simonsen, Erik

    2005-01-01

    warrants careful analysis. The Third International Early Psychosis Conference proved to be a watershed and was the largest and most vibrant meeting to that point. This preface aims to set the scene for a selection of contributions, derived from the array of new evidence reported in Copenhagen, and recently...

  13. Early Learning in CRESPAR.

    Science.gov (United States)

    Wasik, Barbara A.; Karweit, Nancy; Bond, Mary Alice; Woodruff, Lannette Burns; Jaeger, Gary; Adee, Sarah

    2000-01-01

    Summarizes research conducted by the Early Learning Program during the first 5 years of operation of the Center for Research on the Education of Children Placed At Risk (CRESPAR). Describes two integrated areas of research: practices that promote the development of language and literacy skills and systemic issues of school policy and teacher…

  14. Diagnosis of an unidentified sturgeon species using the complete mitochondrial DNA.

    Science.gov (United States)

    Yu, Jeong-Nam; Kwak, Myounghai; Kweon, Seon-Man; Kwon, O-Nam

    2015-01-01

    A sturgeon of unknown species of 11 kg body weight was caught in Gosung-gun, Gangwon Province, Korea (38°17'10.67″N, 128°33'20.28″E). The morphological characteristics were similar to species of the genus Acipenser such as Acipenser medirostris, A. schrenckii and A. baerii, but it was not an obvious match. To identify the species using genetic tools, we analysed the complete mitogenome of this unidentified sturgeon, and found it to comprise 16,526 bp. The genome encoded 2 rRNAs, 22 tRNAs, 13 protein-coding genes and 1 control region. The nucleotide divergence between the complete mitogenome of the unidentified sturgeon and those of four Acipenser spp. (A. transmontanus, A. dabryanus, A. schrenckii and A. baerii) was 0.736%, 3.875%, 0.085% and 5.580%, respectively. This study suggests that the unidentified sturgeon is able to predict the least maternal lines with A. schrenckii.

  15. Early life vaccination

    DEFF Research Database (Denmark)

    Nazerai, Loulieta; Bassi, Maria Rosaria; Uddbäck, Ida Elin Maria

    2016-01-01

    Intracellular pathogens represent a serious threat during early life. Importantly, even though the immune system of newborns may be characterized as developmentally immature, with a propensity to develop Th2 immunity, significant CD8+ T-cell responses may still be elicited in the context of optimal...... priming. Replication deficient adenoviral vectors have been demonstrated to induce potent CD8+ T-cell response in mice, primates and humans. The aim of the present study was therefore to assess whether replication-deficient adenovectors could overcome the risk of overwhelming antigen stimulation during...... the first period of life and provide a pertinent alternative in infant vaccinology. To address this, infant mice were vaccinated with three different adenoviral vectors and the CD8+ T-cell response after early life vaccination was explored. We assessed the frequency, polyfunctionality and in vivo...

  16. Early Childhood Caries

    Directory of Open Access Journals (Sweden)

    Yumiko Kawashita

    2011-01-01

    Full Text Available Dental caries is one of the most common childhood diseases, and people continue to be susceptible to it throughout their lives. Although dental caries can be arrested and potentially even reversed in its early stages, it is often not self-limiting and progresses without proper care until the tooth is destroyed. Early childhood caries (ECC is often complicated by inappropriate feeding practices and heavy infection with mutans streptococci. Such children should be targeted with a professional preventive program that includes oral hygiene instructions for mothers or caregivers, along with fluoride and diet counseling. However, these strategies alone are not sufficient to prevent dental caries in high-risk children; prevention of ECC also requires addressing the socioeconomic factors that face many families in which ECC is endemic. The aim of this paper is to systematically review information about ECC and to describe why many children are suffering from dental caries.

  17. Early Detection Of Cancer

    Directory of Open Access Journals (Sweden)

    V B Bhatnagar

    1987-04-01

    Full Text Available Farly detection of cancer is based upon three fundamental assumptions, firstly that the trea'ment of benign and precancerous lesions reduces the incidence of cancer, secondly, that the treatment of in situ cancers is conducive to total cure and thirdly that early diagnosis and management of invasive cancer ensures be.ter survival. When patient seeks medical advice for vague symptoms, which could however be due to a possible malignant tumour at a particular site, the alert clinician should investigate the patient immediately to exclude cancer. At this stage cancer is usually not significantly advanced.Currently the U. I. C. C. (International Union for Cancer Control} is studying the epidemiology of cancers in various countries The importance of this is two folds : Firstly by focussing attention on a section of population vulnerable to a particular cancer an early detection is facilitated Secondly by changing the causative factors responsible to a particular cancer, the incidence of that cancer can be reduced e. g. reduction in lung cancer following campaigns against ciguette smoking and reductioi in breast cancer after campaigns for advocating breast feeding of infants, lowering fat consumption and encouraging self palpation of breast regularly.Indeed early diagnosis of cancer implies diagnosis of cancer in almost a symptomatic stage It involves motiva’ion of the population towards acquisitio : of knowledge, attitude and practice.. Epidemiologies and clinicians should be able to recognise high risk cases exposed to particular neoplasia and knowledge of alarming symptoms should be pro- pogated for wide publicity through common available media and means. Probable cases should have regular clhrcal examination periodically and relevant investigations including radiological, imaging techniques and Bio-Chemical examination should be undertaken as and when desired Suspicious lesions should be investigated by specific tests including smear cytology

  18. Early Life Exposures and Cancer

    Science.gov (United States)

    Early-life events and exposures have important consequences for cancer development later in life, however, epidemiological studies of early-life factors and cancer development later in life have had significant methodological challenges.

  19. Early Onset Werner Syndrome

    Directory of Open Access Journals (Sweden)

    Berna İmge Aydoğan

    2015-09-01

    Full Text Available Werner syndrome (WS is a rare autosomal recessive adult-onset progeroid disorder characterized by the early onset of aged-appearance and age-related metabolic disorders. Symptoms of premature aging usually first develop in the second-third decades of life. We report a 27-year-old female who was admitted to our clinic at the age of eighteen with hyperglycemia. She was diagnosed with diabetes and type 4 dyslipidemia at the age of seven. In her family history, her parents were first cousins and she had three healthy brothers. On her first physical examination; she had bird-like face appearance, global hair loss, beaked nose, short stature and she was overweight. She had global hair loss with gray and thin hair. Hoarseness of voice and hyperkeratosis of skin were observed. She had bilateral cataracts and moderate sensorineural hearing loss. On psychiatric examination, borderline mental retardation was detected. She had severe insulin resistance and hypertriglyceridemia despite levothyroxine, gemfibrozil, omega-3 and intensive insulin treatment. Routine lipid apheresis was performed to lower the triglyceride levels reaching 5256 mg/dL. She also had focal segmental glomerulosclerosis, hepatosteatosis, osteoporosis and epilepsy. Disease was accompanied by several congenital deformities, such as Rathke’s cleft cyst, angiomyolipoma and femoral neck hypoplasia. WS is a rare genetic disorder characterized by multiple endocrine manifestations as well as soft tissue changes. We present a case of early disturbances that were diagnosed before typical clinical signs and symptoms. We propose that WS should be kept in mind when type 2 diabetes and hyperlipidemia are diagnosed early in childhood. Turk Jem 2015; 19: 99-104

  20. Early prevention of obesity

    Directory of Open Access Journals (Sweden)

    Claudio Maffeis

    2014-06-01

    Full Text Available Childhood obesity is the metabolic disorder with the highest prevalence in both children and adults. Urgency to treat and prevent childhood obesity is based on the clear evidence that obesity tends to track from childhood to adulthood, is associated to morbidity also in childhood and to long-term mortality. Early life, i.e., intrauterine life and the first two years, is a sensitive window for prevention. Anatomical and functional maturation of the hypothalamic structures devoted to regulating energy intake and expenditure and body size mainly occurs in the first 1,000 days of life. Therefore, factors affecting the foetal exposition to maternal metabolic environment and early postnatal nutrition are crucial in modulating the definition of the metabolic programming processes in the brain. Maternal diseases, mainly malnutrition for defect or excess, obesity and diabetes, placental disorders and dysfunctions, maternal use of alcohol and drugs, smoking, affect long term metabolic programming of the foetus with lifelong consequences. Similarly, early nutrition contributes to complete the long-term metabolic regulating framework initiated in the uterus. Breastfeeding, adequate weaning, attention to portion size and diet composition are potential tools for reducing the obesity risk later in childhood. Longitudinal randomized controlled studies are needed for exploring the efficacy of obesity prevention strategies initiated after conception.Proceedings of the 10th International Workshop on Neonatology · Cagliari (Italy · October 22nd-25th, 2014 · The last ten years, the next ten years in Neonatology Guest Editors: Vassilios Fanos, Michele Mussap, Gavino Faa, Apostolos Papageorgiou

  1. Early Childhood Special Music Education

    Science.gov (United States)

    Darrow, Alice-Ann

    2011-01-01

    The process of early intervention is a critical component of Early Childhood Special Music Education. Early intervention is the process of providing services, education, and support to young children who have disabilities or to children who are at-risk of developing needs that may affect their physical, cognitive, or emotional development. The…

  2. 西伯利亚鲟致病性嗜水气单胞菌外膜蛋白及其抗原性分析%Antigenicity of outer membrane proteins of pathogenic Aeromonas hydrophila isolated from Siberian sturgeon Acipenser baerii

    Institute of Scientific and Technical Information of China (English)

    姜有声; 杨倩; 李圆圆; 杨先乐; 吕利群; 邱军强

    2012-01-01

    A pathogenic strain Aeromonas hydrophila was isolated from Siberian sturgeon ( Acipenser baerii ) suffering with bacterial septicaemia. In this experiment, OMPs of four strains of Aeromonas were obtained by Sarkosyl method combining super centrifugal purification. SDS-PAGE showed that the strain had 14 membrane proteins with molecular weights of from 26 kDa to 120 kDa. OMPs of the pathogencial and unpathogencial Aeromonas hydrophila, Aeromonas caviae and Aeromonas sobria were analyzed and compared by using SDS-PAGE. The results showed that molecular weights focused on from 26 kDa to 120 kDa. After SDS-PAGE, in the Western-blotting with rabbit antiserum against Aeromonas hydrophila isolated from Siberian sturgeon, only 6 OMPs of the strain with molecular weights at 75 kDa, 52 kDa,43 kDa,40 kDa,34 kDa and 28kDa were detected. It showed that the 6 OMPs had some antigenicity. And the other 3 strains of Aeromonas all had positive reaction. The band of 28kDa and 34kDa had visible positive reaction in all 4 Aeromonas strains, the band of 43kDa and 75 kDa had positive reaction in some Aeromonas strains.%采用十二烷基肌氨酸钠(Sarkosyl)法提取西伯利亚鲟嗜水气单胞菌(Aeromonas hydrophila)外膜蛋白,电泳显示所提取的主要外膜蛋白分子量为26~120 kDa;为比较该菌株与气单胞菌菌属其他细菌外膜蛋白组分及抗原性异同,以致病性豚鼠气单胞菌(A.caviae)、温和气单胞菌(A.sobria)和无致病力的嗜水气单胞菌为对照,电泳图谱显示4种气单胞菌外膜蛋白的分子量主要集中在26~120 kDa之间;利用抗西伯利亚鲟嗜水气单胞菌血清的免疫印迹试验表明该菌株外膜蛋白中分子量为75 kDa、52 kDa、43 kDa、40 kDa、34 kDa、28 kDa的蛋白条带呈现阳性反应,其他3种气单胞菌外膜蛋白中均有与该抗血清反应的条带,且分子量为28 kDa、34 kDa的反应条带为4株菌共有;43 kDa与75 kDa反应条带为部分菌株共有.为进一步筛选和

  3. Sonority and early words

    DEFF Research Database (Denmark)

    Kjærbæk, Laila; Boeg Thomsen, Ditte; Lambertsen, Claus

    2015-01-01

    Syllables play an important role in children’s early language acquisition, and children appear to rely on clear syllabic structures as a key to word acquisition (Vihman 1996; Oller 2000). However, not all languages present children with equally clear cues to syllabic structure, and since the spec......Syllables play an important role in children’s early language acquisition, and children appear to rely on clear syllabic structures as a key to word acquisition (Vihman 1996; Oller 2000). However, not all languages present children with equally clear cues to syllabic structure, and since...... acquisition therefore presents us with the opportunity to examine how children respond to the task of word learning when the input language offers less clear cues to syllabic structure than usually seen. To investigate the sound structure in Danish children’s lexical development, we need a model of syllable......-29 months. For the two children, the phonetic structure of the first ten words to occur is compared with that of the last ten words to occur before 30 months of age, and with that of ten words in between. Measures related to the sonority envelope, viz. sonority types and in particular sonority rises...

  4. Artritis Temprana Early Arthritis

    Directory of Open Access Journals (Sweden)

    2011-02-01

    Full Text Available Hasta la década de los años ochenta se consideraba a la artritis reumatoide (AR como una enfermedad poco frecuente, de gravedad leve a moderada, que tenía una evolución lentamente, progresiva hacia el daño articular y la incapacidad. El aborde terapéutico convencional hasta ese momento, era el tratamiento clásico de la pirámide.Until the early the eighties was considered rheumatoid arthritis to (RA as a rare disease of mild to moderate severity, which had a slowly evolution towards joint damage and disability. The conventional therapeutic option until then, was the classic treatment of the pyramid.

  5. Early times in tunneling

    CERN Document Server

    García-Calderón, G; Garcia-Calderon, Gaston; Villavicencio, Jorge

    2000-01-01

    Exact analytical solutions of the time-dependent Schr\\"odinger equation with the initial condition of an incident cutoff wave are used to investigate the traversal time for tunneling. The probability density starts from a vanishing value along the tunneling and transmitted regions of the potential. At the barrier width it exhibits, at early times, a distribution of traversal times that typically has a peak $\\tau_p$ and a width $\\Delta \\tau$. Numerical results for other tunneling times, as the phase-delay time, fall within $\\Delta \\tau$. The B\\"uttiker traversal time is the closest to $\\tau_p$. Our results resemble calculations based on Feynman paths if its noisy behaviour is ignored.

  6. Early-Onset Dementia

    DEFF Research Database (Denmark)

    Konijnenberg, Elles; Fereshtehnejad, Seyed-Mohammad; Kate, Mara Ten;

    2017-01-01

    BACKGROUND: Early-onset dementia (EOD) is a rare condition, with an often atypical clinical presentation, and it may therefore be challenging to diagnose. Specialized memory clinics vary in the type of patients seen, diagnostic procedures applied, and the pharmacological treatment given. The aim...... of this study was to investigate quality-of-care indicators in subjects with EOD from 3 tertiary memory clinics in 3 European countries. METHODS: We included 1325 newly diagnosed EOD patients, ages 65 years or younger, between January 1, 2007 and December 31, 2013, from the Danish Dementia Registry...... (Rigshospitalet, Copenhagen), the Swedish Dementia Registry ("SveDem", Karolinska University Hospital, Stockholm), and the Amsterdam Dementia Cohort (VU University Medical Center). RESULTS: The frequency of EOD among all dementia patients was significantly lower in Copenhagen (410, 20%) and Stockholm (284, 21...

  7. Icebergs on early Mars

    Science.gov (United States)

    Uceda, E.; Fairen, A.; Woodworth-Lynas, C.; Palmero Rodriguez, A.

    2015-12-01

    The smooth topography of the Martian northern lowlands has been classically equated to an ancient ocean basin. The High-Resolution Imaging Science Experiment (HiRISE) onboard the Mars Reconnaissance Orbiter (MRO) is providing unprecedented images of the Martian surface at scales of 25 to 32 cm per pixel. The analysis of this high-resolution imaging reveals the presence of three differentiated geomorphologies throughout the northern lowlands of Mars and the Hellas basin, which are informative of the presence of icebergs floating in ancient oceans and/or seas. These morphologies are: (i) scattered scour marks, including curvilinear furrows several km long and some meters deep; (ii) boulders ranging in size from 0.5 m to ~2 m in diameter, distributed forming clusters with sizes from several hundred meters to 1-2 km; and (iii) flat-topped and conical circular fractured mounds. The association of plough marks, clusters of boulders and mounds on the northern plains of Mars can be related to the dual processes of ice keel scouring and ice rafting of both glacial and non-glacial detritus by a floating ice canopy and icebergs. These processes are well documented on Earth and result in distinct morphologies on the ocean floor, which are analogous to features observed in the Martian basins. Importantly, the features are located in elevated areas of the northern plains and Hellas, near the dichotomy boundary and on local topographic highs. Such distribution is expected, as these relatively shoal areas are where the iceberg-related features should occur on Mars: these areas had shallow water depths, less than the iceberg's keel depth, and therefore keels reached through the full depth of the water column to impinge on the sediments below. The presence of icebergs floating in cold oceans early in Mars' history imply the occurrence of continental glaciers forming in the highlands and streaming northward towards the lowlands, and towards the Hellas and Argyre Basins. Glacier

  8. Peer Bullying During Early Childhood

    OpenAIRE

    Uysal, Hatice; DİNÇER, Çağlayan

    2012-01-01

    Peer bullying during early childhood is discussed along with the literature reviewed in this article with the purpose of drawing attention to peer bullying during early childhood and its significance, and contributing to studies which are few in number in Turkey. Peer bullying during early childhood was considered with its definition and types, people who play key roles in peer bullying, factors (gender, age, parents, and friendship) that relate to peer bullying, and what should be done befor...

  9. Assessing Impacts of Navigation Dredging on Atlantic Sturgeon (Acipenser oxyrinchus)

    Science.gov (United States)

    2014-11-01

    navigation channel along with other behavioral aspects of the target species. To assess potential entrainment by a CSD operating in the James River...documented entrainment rates for fishes, shellfishes and specific threatened and endangered species. To minimize potential impacts on fish species...of potential entrainment ” in the James River Federal navigation channel might be defined as that volume of the water column below 6 m. Time budgets

  10. EARLY ENTRANCE COPRODUCTION PLANT

    Energy Technology Data Exchange (ETDEWEB)

    John S. Abughazaleh; Mushtaq Ahmed; Ashok Anand; John H. Anderson; Charles Benham; Fred D. Brent; Thomas E. Chance; William K. Davis; Raymond F. Drnevich; Larry Hall; Ming He; Stephen A. Lang; Jimmy O. Ong; Sarah J. Patel; George Potoczniak; Adela G. Sanchez; Charles H. Schrader; Lalit S. Shah; Phil J. Shires; Rae Song

    2000-10-26

    The overall objective of this project is the three phase development of an Early Entrance Coproduction Plant (EECP) which produces at least one product from at least two of the following three categories: (1) electric power (or heat), (2) fuels, and (3) chemicals. The objective is to have these products produced by technologies capable of using synthesis gas derived from coal and/or other carbonaceous feedstock. The objective of Phase I is to determine the feasibility and define the concept for the EECP located at a specific site and to develop a Research, Development, and Testing Plan (RD and T) for implementation in Phase II. The objective of Phase II is to implement the RD and T as outlined in the Phase I RD and T Plan to enhance the development and commercial acceptance of coproduction technology that produces high-value products, particularly those that are critical to our domestic fuel and power requirements. The project will resolve critical knowledge and technology gaps on the integration of gasification and downstream processing to coproduce some combination of power, fuels, and chemicals from coal and other feedstocks. The objective of Phase III is to develop an engineering design package and a financing plan for an EECP located at a specific site. The project's intended result is to provide the necessary technical, economic, and environmental information that will be needed to move the EECP forward to detailed design, construction, and operation by industry.

  11. EARLY ENTRANCE COPRODUCTION PLANT

    Energy Technology Data Exchange (ETDEWEB)

    Mushtaq Ahmed; John H. Anderson; Charles Benham; Earl R. Berry; Fred Brent; Belma Demirel; Ming He; Troy Raybold; Manuel E. Quintana; Lalit S. Shah; Kenneth A. Yackly

    2003-06-09

    The overall objective of this project is the three phase development of an Early Entrance Coproduction Plant (EECP) which produces at least one product from at least two of the following three categories: (1) electric power (or heat), (2) fuels, and (3) chemicals. The objective is to have these products produced by technologies capable of using synthesis gas derived from coal and/or other carbonaceous feedstocks. The objectives of Phase I were to determine the feasibility and define the concept for the EECP located at a specific site; develop a Research, Development, and Testing (RD&T) Plan for implementation in Phase II; and prepare a Preliminary Project Financing Plan. The objective of Phase II is to implement the work as outlined in the Phase I RD&T Plan to enhance the development and commercial acceptance of coproduction technology that produces high-value products, particularly those that are critical to our domestic fuel and power requirements. The project will resolve critical knowledge and technology gaps on the integration of gasification and downstream processing to coproduce some combination of power, fuels, and chemicals from coal and/or other carbonaceous feedstocks. The objective of Phase III is to develop an engineering design package and a financing and testing plan for an EECP located at a specific site. The project's intended result is to provide the necessary technical, economic, and environmental information needed by industry to move the EECP forward to detailed design, construction, and operation.

  12. EARLY ENTRANCE COPRODUCTION PLANT

    Energy Technology Data Exchange (ETDEWEB)

    John S. Abughazaleh; Mushtaq Ahmed; Ashok Anand; John H. Anderson; Charles Benham; Fred D. Brent; Thomas E. Chance; William K. Davis; Raymond F. Drnevich; Larry Hall; Ming He; Stephen A. Lang; David Mintner; Wendy Moore; Jimmy O. Ong; George Potoczniak; Adela G. Sanchez; Charles H. Schrader; Lalit S. Shah; Kalapi D. Sheth; Phil J. Shires; Rae Song

    2001-05-17

    The overall objective of this project is the three-phase development of an Early Entrance Coproduction Plant (EECP) that produces at least one product from at least two of the following three categories: Electric power (or heat); Fuels; and Chemicals. The objective is to have these products produced by technologies capable of using synthesis gas derived from coal and/or some other carbonaceous feedstock, such as petroleum coke. The objective of Phase I was to determine the feasibility and define the concept for the EECP located at a specific site and to develop a Research, Development, and Testing (RD and T) Plan for implementation in Phase II. This objective has now been accomplished. A specific site, Motiva Refinery in Port Arthur, Texas, has been selected as the location best suited for the EECP. The accomplishments of Phase I are discussed in detail in this Phase I Concept Report. A RD and T Plan and a preliminary project financing plan have been developed and are submitted separately from this report.

  13. Freud's early clinical work.

    Science.gov (United States)

    Vogel, L Z

    1994-01-01

    Freud became a medical practitioner because it was impossible for him to pursue the desired career of a microscopic researcher. His education and training had not prepared him for the task of being a practicing physician. In his private practice he began treating some very intelligent, chaotic, demanding, volatile and disturbed patients. Anna von Lieben was one of these patients whom Freud treated very intensively for a long period of time. Elise Gomperz was another talented and severely pained early patient of Freud. Over a number of years, Freud was her psychiatrist and provided her with attentive care using a variety of treatment methods that were available to him at that time. Emmy von N.'s condition was also fluctuating and very demanding. The dramatic sense and chronic clinical course of these patients is compatible with the contemporary diagnostic category of Borderline Personality Disorder. Freud provided these patients with long-term supportive care while he attempted to cure them. At the same time, Freud committed himself to the theory of radical cure and downplayed the supportive, draining and difficult clinical work that he was doing.

  14. Early reionization by miniquasars

    CERN Document Server

    Madau, P; Oh, S P; Rees, Martin J; Volonteri, M; Madau, Piero; Rees, Martin J.; Volonteri, Marta; Haardt, Francesco

    2004-01-01

    Motivated by the recent detection by WMAP of a large optical depth to Thomson scattering -- implying a very early reionization epoch -- we assess a scenario where the universe was reionized by `miniquasars' powered by intermediate-mass black holes (IMBHs), the remnants of the first generation of massive stars. Pregalactic IMBHs form within minihalos above the cosmological Jeans mass collapsing at z=24, get incorporated through mergers into larger and larger systems, sink to the center owing to dynamical friction, and accrete cold material. The merger history of dark halos and associated IMBHs is followed by Monte Carlo realizations of the merger hierarchy in a LCDM cosmology. While seed IMBHs that are as rare as the 3.5-sigma peaks of the primordial density field evolve largely in isolation, a significant number of black hole binary systems will form if IMBHs populate the more numerous 3-sigma peaks instead. In the case of rapid binary coalescence a fraction of IMBHs will be displaced from galaxy centers and ...

  15. Early Repolarization Syndrome

    Directory of Open Access Journals (Sweden)

    Frederic Sacher

    2015-04-01

    Full Text Available The electrocardiographic pattern of early repolarization (ER is common, with a particularly high prevalence reported amongst athletes and adolescents. It has long been associated with benign outcome [1-3]. Recently, an association between inferolateral ER pattern and sudden cardiac death (SCD has been established by different groups [4-7]. Population-based studies have also reported an increased mortality rate among patients with inferolateral ER pattern compared to controls [7-9]. To bring back together these differences, it is important to focus on the definition of ER pattern used in these different studies as well as the population included. The definition of ER pattern associated with sudden cardiac death was the presence of J point elevation more than or equal to 0.1mV in at least 2 contiguous inferior and/or lateral leads of a standard 12-lead ECG and not ST elevation as it was often the case in the studies with benign outcome. Any study dealing with ER should clearly indicate the definition used. Otherwise it cannot be interpreted. Talking about definition, ER syndrome is an ER pattern (as defined above associated with symptoms (syncope or aborted SCD and/or familial history of SCD as mentioned in the last HRS/EHRA/APHRS Expert Consensus Statement on the Diagnosis and Management of Patients with Inherited Primary Arrhythmia Syndromes [10]. It is important to recognise that having only an ER pattern is not a disease.

  16. Is credit for early action credible early action?

    Energy Technology Data Exchange (ETDEWEB)

    Rolfe, C. [West Coast Environmental Law Research Foundation, Vancouver, BC (Canada); Michaelowa, A.; Dutschke, M. [Hamburg Institute for Economic Research, Hamburg, (Germany)

    1999-12-01

    Credit for early action as a tool for greenhouse gas emissions reduction is compared with various market instruments as a means of narrowing the gap between projected emssions and those of the Kyoto Protocol. Market instruments work by creating a market price for emissions and use the market to encourage reductions at the lowest price, which is done by placing limits on greenhouse gas emissions and allowing the market to decide where reductions occur, or by imposing a carbon tax or emissions charge. While they can be applied within a sector, they are usually used to encourage reductions throughout the economy or across large sectors. Credit for early action also creates an incentive for emissions reductions throughout the economy or at least across many sectors. Credit for early action tools do not work by either imposing a carbon tax or emissions charge or placing limits on emissions, rather they promise that entities that take action against greenhouse gases prior to the imposition of a carbon tax or emissions limits will receive a credit against future taxes or limits. An overview is provided of the Kyoto Protocol and the rationale for taking early action, and a review is included of the theory and specific proposals for market instruments and credit for early action. A comparative analysis is provided of these approaches by examining their relative efficiency, environmental effectiveness, and impacts on the redistribution of wealth. Credit for early action is viewed as problematic on a number of counts and is seen as an interim strategy for imposition while political support for market instruments develop. The environmental effectiveness of credit for early action is very difficult to predict, and credit for early action programs do not yield the lowest cost emissions reductions. Credit for early action programs will not achieve compliance with the Kyoto Protocol at the lowest cost, and credits for early action will increase the compliance costs for those who

  17. Early onset sebaceous carcinoma

    Directory of Open Access Journals (Sweden)

    Kaltreider Sara A

    2011-09-01

    Full Text Available Abstract Background Ocular sebaceous carcinoma can masquerade as benign lesions resulting in delay of diagnosis. Early recognition is even more difficult in young patients where the disease rarely occurs. Here, we provide a clinicopathological correlation of ocular sebaceous carcinoma in a young individual lacking history of hereditary cancer or immunosuppression. Findings A detailed histopathological study including p53 DNA sequencing was performed on an aggressive sebaceous carcinoma presenting in a healthy 32 year-old Caucasian woman. She had no history of retinoblastoma, evidence for a hereditary cancer syndrome, or radiation therapy. However, she potentially was at risk for excessive UV light exposure. A detailed review of the literature is also provided. A moderately well differentiated sebaceous carcinoma was established histopathologically arising from the meibomian gland of the upper eyelid. In most areas, the cytoplasm contained small but distinct Oil-red-O positive vacuoles. Direct sequencing of p53 identified a G:C→A:T mutation at a dipyrimidine site. The mutation results in substitution of arginine for the highly conserved glycine at residue 199 located at the p53 dimer-dimer interface. Energy minimization structural modeling predicts that G199R will neutralize negative charges contributed by nearby inter- and intramonomeric glutamate residues. Discussion This study points to the importance of recognizing that sebaceous carcinoma can occur in young patients with no evidence for hereditary cancer risk or radiation therapy. The G199R substitution is anticipated to alter the stability of the p53 tetrameric complex. The role of UV light in the etiology of sebaceous carcinoma deserves further study. Our findings, taken together with those of others, suggest that different environmental factors could lead to the development of sebaceous carcinoma in different patients.

  18. Teachers in Early Childhood Policy

    Science.gov (United States)

    Kilderry, Anna

    2014-01-01

    This paper examines teacher accountability and authority in early childhood policy. It reports on data from a study that investigated the influences affecting early childhood teacher decision-making at the preschool level in Victoria, Australia. Using a question raised by Ball "Where are the teachers in all this [policy]?" provided a…

  19. Early Childhood Inclusion in Spain

    Science.gov (United States)

    Giné, Climent; Balcells-Balcells, Anna; Cañadas, Margarita; Paniagua, Gema

    2016-01-01

    This article describes early childhood inclusion in educational settings in Spain. First, we address the legislative framework of preschool education in Spain and offer a brief analysis of some relevant issues, including the current situation of early childhood education and inclusion at this stage. Second, current policies and practices relating…

  20. Voluntary Incentive Early Retirement Programs.

    Science.gov (United States)

    Research Dialogues, 1988

    1988-01-01

    Arrangements in educational institutions for voluntary early retirement programs are discussed. Retirement at any age can be a profound and stressful lifetime change; and it can also represent a welcome transition into newly satisfying and rewarding opportunities. The focus is on: mandatory retirement (exceptions and the new meaning of "early");…

  1. Expertise of Early Childhood Educators

    Science.gov (United States)

    Happo, Iiris; Määttä, Kaarina

    2011-01-01

    Every preschool age child in Finland has the right to day care and the expertise of educators is multidimensional. The aim of this article is to clarify the expertise of those early childhood educators, who have the competence of kindergarten teachers (n = 80). The data consisted of the early educators' stories of their growth towards expertise.…

  2. Missouri: Early Head Start Initiative

    Science.gov (United States)

    Center for Law and Social Policy, Inc. (CLASP), 2012

    2012-01-01

    Missouri's Early Head Start/Child Care Partnership Project expands access to Early Head Start (EHS) services for children birth to age 3 by developing partnerships between federal Head Start, EHS contractors, and child care providers. Head Start and EHS contractors that participate in the initiative provide services through community child care…

  3. Early intervention services in psychosis

    DEFF Research Database (Denmark)

    Csillag, Claudio; Nordentoft, Merete; Mizuno, Masafumi

    2016-01-01

    AIM: Early intervention (EI) in psychosis is a comprehensive and evidence-based approach aimed at detection and treatment of psychotic symptoms in their early stages. This paper presents core features and noteworthy aspects of the evidence basis and limitations of EI, the importance of programme...

  4. A review of sturgeon virosis

    Institute of Scientific and Technical Information of China (English)

    HUA Yu-ping; WANG Di

    2005-01-01

    Sturgeon, as a kind of rare large-scale economic fish, has high scientific research and commercial value. But virosis was a significant cause of mortality among farm-raised juvenile sturgeon, which brought tremendous loss in the last decades. In this paper, we reviewed the studies on four sturgeon viruses: white sturgeon (Acipenser transmontanus) iridovirus (WSIV), white sturgeon herpesvirus-1,2 (WSHV-1,2) and shovelnose sturgeon (Scaphirhynchus Scaphirhynchus) iridovirus (SSIV). The content of this review were mainly focused on clinic symptom of infected fish, diagnostic method, virus isolation, prophylactic and remedy. Based on a detailed conclusion and analysis, it is reasonable that molecular biology techniques might be a potential method for sturgeon virosis diagnosis.

  5. Persistence of identifiable remains of white sturgeon juveniles in digestive tracts of northern pikeminnow

    Science.gov (United States)

    Gadomski, D.M.; Frost, C.N.

    2004-01-01

    Juvenile white sturgeon, Acipenser transmontanus, have not been commonly identified as prey items in digestive tracts of fishes collected in the wild. In particular, the diet of northern pikeminnow, Ptychocheilus oregonensis, an abundant Pacific Northwest freshwater predator which has been widely studied, has not included juvenile white sturgeon. To aid in interpreting these results and help in planning future feeding studies, we determined the persistence of identifiable remains of white sturgeon juveniles in this predator's digestive tract. Northern pikeminnow (mean total length = 476 mm), were force-fed meals of 2 or 3 juvenile white sturgeon (mean total length = 91 mm). After digestive periods of 4, 8, 16, 24, 28, and 32h at a water temperature of about 17 ??C, fish were sacrificed, digestive tracts removed, and contents examined. Our results indicate that juvenile white sturgeon would be readily discernable in digestive tracts of northern pikeminnow at least a day after feeding, with scutes remaining undigested and identifiable for 28 h.

  6. White sturgeon spawning areas in the lower Snake River

    Science.gov (United States)

    Parsley, M.J.; Kappenman, K.M.

    2000-01-01

    We documented 17 white sturgeon Acipenser transmontanus spawning locations in the Snake River from the mouth to Lower Granite Dam (river km 0 to 173). Spawning locations were determined by the collection of fertilized eggs on artificial substrates or in plankton nets. We collected 245 eggs at seven locations in McNary Reservoir, 22 eggs at three locations in Ice Harbor Reservoir, 30 eggs from two locations in Lower Monumental Reservoir, and 464 eggs at five locations in Little Goose Reservoir. All 17 locations were in high water velocity areas and between 1.0 and 7.0 km downstream from a hydroelectric dam. The documentation of spawning areas is important because this habitat is necessary to maintain natural and viable populations.

  7. Influence of externally attached trasmitters on the swimming performance of juvenile white sturgeon

    Science.gov (United States)

    Counihan, T.D.; Frost, C.N.

    1999-01-01

    We measured the critical swimming speed of juvenile white sturgeons Acipenser transmontanus equipped with externally attached dummy ultrasonic transmitters and of untagged control fish in the laboratory. White sturgeons ranging from 31.9 to 37.0 cm fork length were subjected to one of three treatments: Control (handled but not tagged), tag attached below the dorsal fin, and tag attached with the anterior insertion point between the fourth and fifth dorsal scutes. Although transmitters were of recommended weight, we found that the swimming performance of tagged white sturgeons was significantly less than that of untagged control fish. Swimming performance of tagged fish was not differentially affected by tag location. Our results suggest that data from ultrasonic telemetry studies of externally tagged juvenile white sturgeons should be interpreted with caution due to the reduced swimming performance caused by external transmitters.

  8. Polycystic lesions in the liver of the white sturgeon.

    Science.gov (United States)

    Taylor, Peter; Smith, Charlie E; Blair, Marilyn J

    2009-03-01

    Polycystic lesions have been reported from the kidney and liver of many different fish species and are attributed to pollution and genetic anomalies. In June 2002, eggs and milt were collected from two female and five male white sturgeon Acipenser transmontanus below Bonneville Dam on the Columbia River. Fertilized eggs were hatched at the Abernathy Fish Technology Center in Longview, Washington, and 20,000 juveniles were raised for approximately 1 year before release into the wild. Just before release, 12,000 juveniles were scute-marked, during which it was noticed that about 30 fish had distended abdomens. Gross necropsy revealed a large, jellylike mass in the peritoneal cavity. Histopathological examination of four fish showed that this growth was a polycystic lesion of liver tissue. This is the first report of this type of lesion in white sturgeon and is presumed to be the product of a genetic anomaly.

  9. Influence of externally attached transmitters on the swimming performance of juvenile white sturgeon

    Science.gov (United States)

    Counihan, T.D.; Frost, C.N.

    1999-01-01

    We measured the critical swimming speed of juvenile white sturgeons Acipenser transmontanus equipped with externally attached dummy ultrasonic transmitters and of untagged control fish in the laboratory. White sturgeons ranging from 31.9 to 37.0 cm fork length were subjected to one of three treatments: control (handled but not tagged), tag attached below the dorsal fin, and tag attached with the anterior insertion point between the fourth and fifth dorsal scutes. Although transmitters were of recommended weight, we found that the swimming performance of tagged white sturgeons was significantly less than that of untagged control fish. Swimming performance of tagged fish was not differentially affected by tag location. Our results suggest that data from ultrasonic telemetry studies of externally tagged juvenile white sturgeons should be interpreted with caution due to the reduced swimming performance caused by external transmitters.

  10. White sturgeon spawning and rearing habitat in the lower Columbia River

    Science.gov (United States)

    Parsley, Michael J.; Beckman, Lance G.

    1994-01-01

    Estimates of spawning habitat for white sturgeons Acipenser transmontanus in the tailraces of the four dams on the lower 470 km of the Columbia River were obtained by using the Physical Habitat Simulation System of the U.S. Fish and Wildlife Service's Instream Flow Incremental Methodology to identify areas with suitable water depths, water velocities, and substrates. Rearing habitat throughout the lower Columbia River was assessed by using a geographic information system to identify areas with suitable water depths and substrates. The lowering of spring and summer river discharges from hydropower system operation reduces the availability of spawning habitat for white sturgeons. The four dam tailraces in the study area differ in the amount and quality of spawning habitat available at various discharges; the differences are due to channel morphology. The three impoundments and the free-flowing Columbia River downstream from Bonneville Dam provide extensive areas that are physically suitable for rearing young-of-the-year and juvenile white sturgeons.

  11. Capture of white sturgeon larvae downstream of The Dalles Dam, Columbia River, Oregon and Washington, 2012

    Science.gov (United States)

    Parsley, Michael J.; Kofoot, Eric

    2013-01-01

    Wild-spawned white sturgeon (Acipenser transmontanus) larvae captured and reared in aquaculture facilities and subsequently released, are increasingly being used in sturgeon restoration programs in the Columbia River Basin. A reconnaissance study was conducted to determine where to deploy nets to capture white sturgeon larvae downstream of a known white sturgeon spawning area. As a result of the study, 103 white sturgeon larvae and 5 newly hatched free-swimming embryos were captured at 3 of 5 reconnaissance netting sites. The netting, conducted downstream of The Dalles Dam on the Columbia River during June 25–29, 2012, provided information for potentially implementing full-scale collection efforts of large numbers of larvae for rearing in aquaculture facilities and for subsequent release at a larger size in white sturgeon restoration programs.

  12. Sediment transport and evaluation of sediment surrogate ratings in the Kootenai River near Bonners Ferry, Idaho, Water Years 2011–14

    Science.gov (United States)

    Wood, Molly S.; Fosness, Ryan L.; Etheridge, Alexandra B.

    2015-12-14

    The Kootenai River white sturgeon (Acipenser transmontanus) and other native fish species are culturally important to the Kootenai Tribe of Idaho, but their habitat and recruitment have been affected by anthropogenic changes to the river. Although the interconnections among anthropogenic changes and their impacts on fish are complex, the Kootenai Tribe of Idaho, in cooperation with other agencies, has been trying to understand and promote native fish recruitment through the development and implementation of the Kootenai River Habitat Restoration Program. As part of this effort, the U.S. Geological Survey collected sediment and streamflow information and evaluated use of acoustic backscatter as a sediment surrogate for estimating continuous suspended-sediment concentration at three sites in the Kootenai River white sturgeon critical habitat during water years 2011–14.

  13. Early sound distribution in auditorium

    Institute of Scientific and Technical Information of China (English)

    JIANG Guorong; WANG Jiqing

    2000-01-01

    The importance of early sound, i.e., the direct sound and the first reflections, has long been recognized in auditorium design, but the distributions of early sound in auditorium received less investigation in the past. As we know, the early sound level in the audience area varies not only with the source/receiver distance and room constant, but also related with the room geometry, the absorption arrangement and the location of the source and receiver. The early reflections are of discrete components, so it can not be predicted by the diffused field theory. This paper presents the results of measurement in four halls showing the attenuation rates of early sound level with the source/receiver distance are often much larger than the theoretical predictions. Therefore, they may give overestimated results in acoustical design.

  14. Early diagnosis and early intervention in cerebral palsy

    Directory of Open Access Journals (Sweden)

    Mijna eHadders-Algra

    2014-09-01

    Full Text Available This paper reviews the opportunities and challenges for early diagnosis and early intervention in cerebral palsy (CP. CP describes a group of disorders of the development of movement and posture, causing activity limitation, that are attributed to disturbances that occurred in the fetal or infant brain. Therefore the paper starts with a summary of relevant information from developmental neuroscience. Most lesions underlying CP occur in the second half of gestation, when developmental activity in the brain reaches its summit. Variations in timing of the damage not only result in different lesions, but also in different neuroplastic reactions and different associated neuropathologies. This turns CP into a heterogeneous entity. This may mean that the best early diagnostics and the best intervention methods may differ for various subgroups of children with CP. Next, the paper addresses possibilities for early diagnosis. It discusses the predictive value of neuromotor and neurological exams, neuro-imaging techniques and neurophysiological assessments. Prediction is best when complementary techniques are used in longitudinal series. Possibilities for early prediction of CP differ for infants admitted to neonatal intensive care and other infants. In the former group best prediction is achieved with the combination of neuro-imaging and the assessment of general movements, in the latter group best prediction is based on carefully documented milestones and neurological assessment. The last part reviews early intervention in infants developing CP. Most knowledge on early intervention is based on studies in high risk infants without CP. In these infants early intervention programs promote cognitive development until preschool age; motor development profits less. The few studies on early intervention in infants developing CP suggest that programs that stimulate all aspects of infant development by means of family coaching are most promising. More research is

  15. Kootenai River White Sturgeon Investigations; White Sturgeon Spawning and Recruitment Evaluation, 1999 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Paragamian, Vaughn L.; Kruse, Gretchen L.; Wakkinen, Virginia

    2001-11-01

    Sampling for adult Kootenai River white sturgeon Acipenser transmontanus began in March and continued through April 1999. Forty-six adult sturgeon were captured with 4,091 hours of angling and set-lining effort, while an additional three adult sturgeon were captured during gillnetting for juveniles. Flows for Kootenai River white sturgeon spawning were expected to be high because the snow pack in the basin was estimated at 130% of normal, but runoff came very slowly. Discharge from Libby Dam from mid-March through mid-June was maintained at 113 m{sup 3}/s (4,000 cfs). Flows in the Kootenai River at Bonners Ferry during early April, including local inflow, were 227-255 m{sup 3}/s (8,000-9,000 cfs) but increased gradually in late April to a peak of 657 m{sup 3}/s (23,200 cfs). Flows subsided in early May to about 340 m{sup 3}/s (12,000 cfs), but rose to 1,031 m{sup 3}/s (36,370 cfs) by Mary 26 because of local runoff, and white sturgeon began spawning. However, flows subsided again to 373 m{sup 3}/s (13,200 cfs) June 11, 1999 and some female white sturgeon with transmitters began leaving the spawning reach. Water temperature ranged from about 8 C to 10 C (45 F to 50 F) during these two weeks. On June 13 (two weeks after sturgeon began spawning), spawning and incubation flows from Libby Dam began. The flow was brought up to 1,136 m{sup 3}/s (40,100 cfs) and temperature rose to about 11 C (52 F). They sampled for 3,387 mat days (one mat day is a single 24 h set) with artificial substrate mats and captured 184 white sturgeon eggs. The Middle Shorty's Island reach (river kilometer [rkm] 229.6-231.5) produced the most eggs (144), with 388 mat days of effort; the Refuge section (rkm 234.8 to 237.5) with 616 mat days of effort produced 23 eggs; and the Lower Shorty's section produced 19 eggs with 548 days of mat effort. No eggs were collected above the Refuge section (> rkm 240.5) with 988 mat days of effort. They do not believe flows for sturgeon spawning in 1999

  16. EARLY ENTRANCE COPRODUCTION PLANT

    Energy Technology Data Exchange (ETDEWEB)

    David Storm; Govanon Nongbri; Steve Decanio; Ming He; Lalit Shah; Charles Schrader; Earl Berry; Peter Ricci; Belma Demirel; Charles Benham; Mark Bohn

    2004-01-12

    The overall objective of this project is the three phase development of an Early Entrance Coproduction Plant (EECP) which uses petroleum coke to produce at least one product from at least two of the following three categories: (1) electric power (or heat), (2) fuels, and (3) chemicals using ChevronTexaco's proprietary gasification technology. The objective of Phase I is to determine the feasibility and define the concept for the EECP located at a specific site; develop a Research, Development, and Testing (RD&T) Plan to mitigate technical risks and barriers; and prepare a Preliminary Project Financing Plan. The objective of Phase II is to implement the work as outlined in the Phase I RD&T Plan to enhance the development and commercial acceptance of coproduction technology. The objective of Phase III is to develop an engineering design package and a financing and testing plan for an EECP located at a specific site. The project's intended result is to provide the necessary technical, economic, and environmental information needed by industry to move the EECP forward to detailed design, construction, and operation. The partners in this project are Texaco Energy Systems LLC or TES (a subsidiary of ChevronTexaco), General Electric (GE), Praxair, and Kellogg Brown & Root (KBR) in addition to the U.S. Department of Energy (DOE). TES is providing gasification technology and Fischer-Tropsch (F-T) technology developed by Rentech, Inc., GE is providing combustion turbine technology, Praxair is providing air separation technology, and KBR is providing engineering. During Phase I, a design basis for the Fischer-Tropsch Synthesis section was developed based on limited experience with the specified feed gas and operating conditions. The objective of this Task in Phase II RD&T work was to confirm the performance of the F-T reactor at the set design conditions. Although much of the research, development, and testing work were done by TES outside of this project, several

  17. EARLY ENTRANCE COPRODUCTION PLANT

    Energy Technology Data Exchange (ETDEWEB)

    John Anderson; Charles Schrader

    2004-01-26

    In 1999, the U. S. Department of Energy (DOE) awarded a Cooperative Agreement to Texaco Energy Systems Inc. to provide a preliminary engineering design of an Early Entrance Coproduction Plant (EECP). Since the award, continuous and diligent work has been undertaken to achieve the design of an economical facility that makes strides toward attaining the goal of DOE's Vision 21 Program. The objective of the EECP is to convert coal and/or petroleum coke to power while coproducing transportation fuels, chemicals, and useful utilities such as steam. This objective is being pursued in a three-phase effort through the partnership of the DOE with prime contractor Texaco Energy Systems, LLC. (TES), the successor to Texaco Energy Systems, Inc. The key subcontractors to TES include General Electric (GE), Praxair, and Kellogg Brown and Root. ChevronTexaco provided gasification technology and Rentech Inc.'s Fischer-Tropsch (F-T) technology that has been developed for non-natural gas sources. GE provided gas turbine technology for the combustion of low energy content gas. Praxair provided air separation technology and KBR provided engineering to integrate the facility. A conceptual design was completed in Phase I and the report was accepted by the DOE in May 2001. The Phase I work identified risks and critical research, development, and testing that would improve the probability of technical success of the EECP. The objective of Phase II was to mitigate the risks by executing research, development, and testing. Results from the Phase II work are the subject of this report. As the work of Phase II concluded, it became evident that sufficient, but not necessarily complete, technical information and data would be available to begin Phase III - Preliminary Engineering Design. Work in Phase II requires additional technical development work to correctly apply technology at a specific site. The project's intended result is to provide the necessary technical, economic, and

  18. What Works Clearinghouse Quick Review: "Early College, Early Success: Early College High School Initiative Impact Study"

    Science.gov (United States)

    What Works Clearinghouse, 2013

    2013-01-01

    The study examined in this quick review concerns whether attending Early College High Schools increased postsecondary outcomes. This study is a randomized experiment examining the impact of Early Colleges on a number of outcomes. The study had relatively low attrition rates (approximately 7% in the intervention group and 13% in the comparison…

  19. EFFECTS OF ACUTE THERMAL STRESS ON HSP70 MRNA, PHYSIOLOGY AND NONSPECIFIC IMMUNITY IN SIBERIAN STURGEON (ACIPENSER BAERII)%急性热应激对西伯利亚鲟HSP70mRNA表达、血清皮质醇和非特异性免疫的影响

    Institute of Scientific and Technical Information of China (English)

    田照辉; 徐绍刚; 王巍; 胡红霞; 马国庆

    2013-01-01

    The effect of acute thermal stress on HSP1Q mRNA expression, physiology and nonspecific immunity were investigated in Siberian sturgeon. In the experiment, ten fish were transferred froml7.5℃ to 27.5℃ water, then data were measured at lh and 3h. Fish in 17.5℃ water were taken as Oh group. Respiratory rate increased from 80-90 breaths/min to 210 breaths/min, then decreased to 180 breaths/min after 0.5h. Among the three tissues including gill, spleen and brain, the HSP70 mRNA expression in gill rose most quickly after lh stress, and was about 1.63 fold compared with the Oh group (P<0.05), then remained this level to 3h; The HSP10 mRNA expression in spleen and brain had nearly no change in lh thermal stress, then rose quickly from lh to 3h in the two tissues, especially in brain at 3h rose most quickly to about 1.77 fold compared with the lh group (P<0.05). Compared with the Oh group, serum cortisol increased quickly and was 5.14 fold (PO.05) at lh, then decreased quickly to 2.1 fold at 3h. Spleen macrophage respiratory burst achieved the maximum (P<0.05) at lh, then reduced to the Oh group level. Serum complement C3 increased at lh and decreased significantly at 3h (P<0.05). Serum lysozyme activity firstly elevated then decreased but had no significant differences. Serum SOD activity decreased when thermal stress time prolonged, and achieved the minimum at 3h (P<0.05). Serum MDA content decreased when thermal stress time prolonged and had no significant difference. The results showed that lh acute thermal stress promoted the nonspecific immunity and tolerance, but 3h acute thermal stress decreased it.%为研究西伯利亚鲟(Acipenser baerii)对急性热应激的抗逆机理,将体质量为(155.47±19.50) g的鱼从17.5 ℃迅速转至27.5 ℃水中,在1h和3h取样测定HSP70 mRNA表达变化、血清皮质醇和非特异性免疫指标.结果显示:急性热应激时鳃、脾和脑的HSP70 mRNA表达量升高,具有组织特异性,热应激1h时

  20. Early vision and visual attention

    Directory of Open Access Journals (Sweden)

    Gvozdenović Vasilije P.

    2003-01-01

    Full Text Available The question whether visual perception is spontaneous, sudden or is running through several phases, mediated by higher cognitive processes, was raised ever since the early work of Gestalt psychologists. In the early 1980s, Treisman proposed the feature integration theory of attention (FIT, based on the findings of neuroscience. Soon after publishing her theory a new scientific approach appeared investigating several visual perception phenomena. The most widely researched were the key constructs of FIT, like types of visual search and the role of the attention. The following review describes the main studies of early vision and visual attention.

  1. Early eruption of permanent canines

    Directory of Open Access Journals (Sweden)

    S Madhu

    2012-01-01

    Full Text Available Systemic and local factors can modify the eruption time of teeth. Generalized eruption time changes could be due to some systemic diseases like hyperthyroidism, hypophosphatasia, precocious puberty, Proteus syndrome, etc. Localized early eruption of permanent teeth could be due to early extraction of deciduous teeth. Presented here is an extremely rare case of early eruption of permanent canines in a 7-year old female child. Though the number of such cases is very limited, the clinician should poses adequate knowledge and keeps an open eye to identify such cases.

  2. Morphogenesis of early stage melanoma

    Science.gov (United States)

    Chatelain, Clément; Amar, Martine Ben

    2015-08-01

    Melanoma early detection is possible by simple skin examination and can insure a high survival probability when successful. However it requires efficient methods for identifying malignant lesions from common moles. This paper provides an overview first of the biological and physical mechanisms controlling melanoma early evolution, and then of the clinical tools available today for detecting melanoma in vivo at an early stage. It highlights the lack of diagnosis methods rationally linking macroscopic observables to the microscopic properties of the tissue, which define the malignancy of the tumor. The possible inputs of multiscale models for improving these methods are shortly discussed.

  3. Early traumatic events in psychopaths.

    Science.gov (United States)

    Borja, Karina; Ostrosky, Feggy

    2013-07-01

    The relationship between diverse early traumatic events and psychopathy was studied in 194 male inmates. Criminal history transcripts were revised, and clinical interviews were conducted to determine the level of psychopathy using the Psychopathy Checklist-Revised (PCL-R) Form, and the Early Trauma Inventory was applied to assess the incidence of abuse before 18 years of age. Psychopathic inmates presented a higher victimization level and were more exposed to certain types of intended abuse than sociopathic inmates, while the sum of events and emotional abuse were associated with the PCL-R score. Our studies support the influence of early adverse events in the development of psychopathic offenders.

  4. Peer Bullying During Early Childhood

    Directory of Open Access Journals (Sweden)

    Hatice UYSAL

    2012-10-01

    Full Text Available Peer bullying during early childhood is discussed along with the literature reviewed in this article with the purpose of drawing attention to peer bullying during early childhood and its significance, and contributing to studies which are few in number in Turkey. Peer bullying during early childhood was considered with its definition and types, people who play key roles in peer bullying, factors (gender, age, parents, and friendship that relate to peer bullying, and what should be done before and after peer bullying.

  5. EARLY ENTRANCE COPRODUCTION PLANT

    Energy Technology Data Exchange (ETDEWEB)

    Charles Benham; Mark Bohn; John Anderson; Earl Berry; Fred Brent; Ming He; Randy Roberts; Lalit Shah; Marjan Roos

    2003-09-15

    The 1999 U. S. Department of Energy (DOE) award to Texaco Energy Systems Inc. (presently Texaco Energy Systems LLC, a subsidiary of ChevronTexaco) was made to provide a Preliminary Engineering Design of an Early Entrance Coproduction Plant (EECP). Since the award presentation, work has been undertaken to achieve an economical concept design that makes strides toward the DOE Vision 21 goal. The objective of the EECP is to convert coal and/or petroleum coke to electric power plus transportation fuels, chemicals and useful utilities such as steam. The use of petroleum coke was added as a fuel to reduce the cost of feedstock and also to increase the probability of commercial implementation of the EECP concept. This objective has been pursued in a three phase effort through the partnership of the DOE with prime contractor Texaco Energy Systems LLC and subcontractors General Electric (GE), Praxair, and Kellogg Brown and Root (KBR). ChevronTexaco is providing gasification technology and Rentech's Fischer-Tropsch technology that has been developed for non-natural gas feed sources. GE is providing gas turbine technology for the combustion of low energy content gas. Praxair is providing air separation technology, and KBR is providing engineering to integrate the facility. The objective of Phase I was to determine the feasibility and define the concept for the EECP located at a specific site; develop a Research, Development, and Testing (RD&T) Plan to mitigate technical risks and barriers; and prepare a Preliminary Project Financing Plan. The objective of Phase II is to implement the work as outlined in the Phase I RD&T Plan to enhance the development and commercial acceptance of coproduction technology. The objective of Phase III is to develop an engineering design package and a financing and testing plan for an EECP located at a specific site. Phase I Preliminary Concept Report was completed in 2000. The Phase I Preliminary Concept Report was prepared based on making

  6. EARLY ENTRANCE COPRODUCTION PLANT

    Energy Technology Data Exchange (ETDEWEB)

    John Anderson; Mark Anselmo; Earl Berry; Mark Bohn; Roko Bujas; Ming He; Ken Kwik; Charles H. Schrader; Lalit Shah; Dennis Slater; Donald Todd; Don Wall

    2003-08-21

    The overall objective of this project is the three phase development of an Early Entrance Coproduction Plant (EECP) which uses petroleum coke to produce at least one product from at least two of the following three categories: (1) electric power (or heat), (2) fuels, and (3) chemicals using ChevronTexaco's proprietary gasification technology. The objective of Phase I is to determine the feasibility and define the concept for the EECP located at a specific site; develop a Research, Development, and Testing (RD&T) Plan to mitigate technical risks and barriers; and prepare a Preliminary Project Financing Plan. The objective of Phase II is to implement the work as outlined in the Phase I RD&T Plan to enhance the development and commercial acceptance of coproduction technology. The objective of Phase III is to develop an engineering design package and a financing and testing plan for an EECP located at a specific site. The project's intended result is to provide the necessary technical, economic, and environmental information needed by industry to move the EECP forward to detailed design, construction, and operation. The partners in this project are Texaco Energy Systems LLC (TES), a subsidiary of ChevronTexaco, General Electric (GE), Praxair, and Kellogg Brown & Root (KBR) in addition to the U.S. Department of Energy (DOE). TES is providing gasification technology and Fischer-Tropsch (F-T) technology developed by Rentech, Inc. GE is providing combustion turbine technology, Praxair is providing air separation technology, and KBR is providing engineering. Each of the EECP subsystems were assessed for technical risks and barriers. A plan was identified to mitigate the identified risks (Phase II RD&T Plan, October 2000). The RD&T Plan identified catalyst/wax separation as a potential technical and economic risk. To mitigate risks to the proposed EECP, Phase II RD&T included tests of an alternative (to Rentech's Dynamic Settler) primary catalyst

  7. EARLY ENTRANCE COPRODUCTION PLANT

    Energy Technology Data Exchange (ETDEWEB)

    Fred D. Brent; Lalit Shah; Earl Berry; Charles H. Schrader; John Anderson; Ming He; James F. Stevens; Centha A. Davis; Michael Henley; Jerome Mayer; Harry Tsang; Jimell Erwin; Jennifer Adams; Michael Tillman; Chris Taylor; Marjan J. Roos; Robert F. Earhart

    2004-01-27

    The overall objective of this project is the three phase development of an Early Entrance Coproduction Plant (EECP) which uses petroleum coke to produce at least one product from at least two of the following three categories: (1) electric power (or heat), (2) fuels, and (3) chemicals using ChevronTexaco's proprietary gasification technology. The objective of Phase I is to determine the feasibility and define the concept for the EECP located at a specific site; develop a Research, Development, and Testing (RD&T) Plan to mitigate technical risks and barriers; and prepare a Preliminary Project Financing Plan. The objective of Phase II is to implement the work as outlined in the Phase I RD&T Plan to enhance the development and commercial acceptance of coproduction technology. The objective of Phase III is to develop an engineering design package and a financing and testing plan for an EECP located at a specific site. The project's intended result is to provide the necessary technical, economic, and environmental information needed by industry to move the EECP forward to detailed design, construction, and operation. The partners in this project are Texaco Energy Systems LLC or TES (a subsidiary of ChevronTexaco), General Electric (GE), Praxair, and Kellogg Brown & Root (KBR) in addition to the U.S. Department of Energy (DOE). TES is providing gasification technology and Fischer-Tropsch (F-T) technology developed by Rentech, GE is providing combustion turbine technology, Praxair is providing air separation technology, and KBR is providing engineering. Each of the EECP subsystems was assessed for technical risks and barriers. A plan was developed to mitigate the identified risks (Phase II RD&T Plan, October 2000). The potential technical and economic risks to the EECP from Task 2.5 can be mitigated by demonstrating that the end-use products derived from the upgrading of the F-T synthesis total liquid product can meet or exceed current specifications for the

  8. Early Retiree Reinsurance Program Reports

    Data.gov (United States)

    U.S. Department of Health & Human Services — The Early Retiree Reinsurance Program (ERRP) was established by section 1102 of the Patient Protection and Affordable Care Act (the Affordable Care Act) enacted on...

  9. NASA Early Career Fellowship Program

    Science.gov (United States)

    Smith, H. D.

    2012-12-01

    The Early Career Fellowship program was established in 2005 to facilitate the integration of outstanding early career planetary science researchers into established research funding programs by providing tools and experience useful to maintain a successful research program. Executing a successful research program requires a few key elements such as: successful proposal writing; adequate (paid) research time; management of a laboratory; collaboration and networking; frequent and high-quality publications; and adequate start-up equipment funds. These elements may be particularly critical for early career researchers searching for a tenure- track or equivalent position. The Early Career Fellowship program recognizes the importance of these skills and provides extra funding and resources to begin a successful research program. For consideration into The Early Career Fellowship program, the candidate needs to be the P. I. or Science P.I. of a funded research proposal from one of the participating R&A program areas, be within 7 years of earning a PhD, hold a non-tenure track position, and indicate the early career candidacy when submitting the research proposal. If the research proposal is funded and the discipline scientist nominates the candidate as an early career fellow, the candidate is then considered a Fellow and eligible to propose for Step 2. Upon obtaining a tenure-track equivalent position the Fellow submits a Step 2 proposal for up to one hundred thousand dollars in start-up funds. Start-up funds may be used for salary; undergraduate and/or graduate research assistants; supplies and instrument upgrades; travel to conferences, meetings, and advisory groups; time and travel for learning new skills; publication page charges; books and journal subscriptions; computer time and/or specialized software; and other justified research-specific needs. The early career fellowship program provides resources that a more established scientist would have acquired allowing

  10. NGIPS Early Design Space Assessment

    Science.gov (United States)

    2014-07-17

    cycles). The results of this case are shown in Fig. 4. It can be seen that the fault causes a momentary outage of some loads and that the system...perform shipboard power system performance metric refinements, early- stage assessment computational tool investigation, and the application of these...early-stage design space exploration methods and tools were pursued in support of the Navy’s Next Generation Integrated Power Systems (NGIPS

  11. EARLY ENTRANCE COPRODUCTION PLANT

    Energy Technology Data Exchange (ETDEWEB)

    Fred D. Brent; Lalit Shah; Earl Berry; Charles H. Schrader; John Anderson; J. Erwin; Matthew G. Banks; Terry L. Ullman

    2004-01-12

    The overall objective of this project is the three phase development of an Early Entrance Coproduction Plant (EECP) which uses petroleum coke to produce at least one product from at least two of the following three categories: (1) electric power (or heat), (2) fuels, and (3) chemicals using ChevronTexaco's proprietary gasification technology. The objective of Phase I is to determine the feasibility and define the concept for the EECP located at a specific site; develop a Research, Development, and Testing (RD&T) Plan to mitigate technical risks and barriers; and prepare a Preliminary Project Financing Plan. The objective of Phase II is to implement the work as outlined in the Phase I RD&T Plan to enhance the development and commercial acceptance of coproduction technology. The objective of Phase III is to develop an engineering design package and a financing and testing plan for an EECP located at a specific site. The project's intended result is to provide the necessary technical, economic, and environmental information needed by industry to move the EECP forward to detailed design, construction, and operation. The partners in this project are Texaco Energy Systems LLC or TES (a subsidiary of ChevronTexaco), General Electric (GE), Praxair, and Kellogg Brown & Root (KBR) in addition to the U.S. Department of Energy (DOE). TES is providing gasification technology and Fischer-Tropsch (F-T) technology developed by Rentech, GE is providing combustion turbine technology, Praxair is providing air separation technology, and KBR is providing engineering. Each of the EECP subsystems was assessed for technical risks and barriers. A plan was developed to mitigate the identified risks (Phase II RD&T Plan, October 2000). Phase II RD&T Task 2.6 identified as potential technical risks to the EECP the fuel/engine performance and emissions of the F-T diesel fuel products. Hydrotreating the neat F-T diesel product reduces potentially reactive olefins, oxygenates, and acids

  12. EARLY ENTRANCE COPRODUCTION PLANT

    Energy Technology Data Exchange (ETDEWEB)

    Fred D. Brent; Lalit Shah; Earl Berry; Charles H. Schrader; John Anderson; J. Erwin; Matthew G. Banks; Terry L. Ullman

    2004-01-12

    The overall objective of this project is the three phase development of an Early Entrance Coproduction Plant (EECP) which uses petroleum coke to produce at least one product from at least two of the following three categories: (1) electric power (or heat), (2) fuels, and (3) chemicals using ChevronTexaco's proprietary gasification technology. The objective of Phase I is to determine the feasibility and define the concept for the EECP located at a specific site; develop a Research, Development, and Testing (RD&T) Plan to mitigate technical risks and barriers; and prepare a Preliminary Project Financing Plan. The objective of Phase II is to implement the work as outlined in the Phase I RD&T Plan to enhance the development and commercial acceptance of coproduction technology. The objective of Phase III is to develop an engineering design package and a financing and testing plan for an EECP located at a specific site. The project's intended result is to provide the necessary technical, economic, and environmental information needed by industry to move the EECP forward to detailed design, construction, and operation. The partners in this project are Texaco Energy Systems LLC or TES (a subsidiary of ChevronTexaco), General Electric (GE), Praxair, and Kellogg Brown & Root (KBR) in addition to the U.S. Department of Energy (DOE). TES is providing gasification technology and Fischer-Tropsch (F-T) technology developed by Rentech, GE is providing combustion turbine technology, Praxair is providing air separation technology, and KBR is providing engineering. Each of the EECP subsystems was assessed for technical risks and barriers. A plan was developed to mitigate the identified risks (Phase II RD&T Plan, October 2000). Phase II RD&T Task 2.6 identified as potential technical risks to the EECP the fuel/engine performance and emissions of the F-T diesel fuel products. Hydrotreating the neat F-T diesel product reduces potentially reactive olefins, oxygenates, and acids

  13. [Autism: An early neurodevelopmental disorder].

    Science.gov (United States)

    Bonnet-Brilhault, F

    2017-02-27

    With approximately 67 million individuals affected worldwide, autism spectrum disorder (ASD) is the fastest growing neurodevelopmental disorder (United Nations, 2011), with a prevalence estimated to be 1/100. In France ASD affects approximately 600,000 individuals (from childhood to adulthood, half of whom are also mentally retarded), who thus have a major handicap in communication and in adapting to daily life, which leads autism to be recognized as a national public health priority. ASD is a neurodevelopmental disorder that affects several domains (i.e., socio-emotional, language, sensori-motor, executive functioning). These disorders are expressed early in life with an age of onset around 18 months. Despite evidence suggesting a strong genetic link with ASD, the genetic determinant remains unclear. The clinical picture is characterized by impairments in social interaction and communication and the presence of restrictive and repetitive behaviors (DSM-5, ICD-10). However, in addition to these two main dimensions there is significant comorbidity between ASD and other neurodevelopmental disorders such as attention deficit hyperactivity disorder or with genetic and medical conditions. One of the diagnostic features of ASD is its early emergence: symptoms must begin in early childhood for a diagnosis to be given. Due to brain plasticity, early interventions are essential to facilitate clinical improvement. Therefore, general practitioners and pediatricians are on the front line to detect early signs of ASD and to guide both medical explorations and early rehabilitation.

  14. Early Learner Engagement in the Clinical Workplace

    NARCIS (Netherlands)

    Chen, H.C.

    2015-01-01

    Introduction Recent calls for medical education reform advocate for the integration of knowledge with clinical experience through early clinical immersion. Yet, early learners rarely are invited to participate in workplace activities and early clinical experiences remain largely observational. We

  15. Can Ovarian Cancer Be Found Early?

    Science.gov (United States)

    ... Ovarian Cancer Early Detection, Diagnosis, and Staging Can Ovarian Cancer Be Found Early? About 20% of ovarian cancers ... cancer in its earliest stage. Ways to find ovarian cancer early Regular women's health exams During a pelvic ...

  16. Effects of Fish Meal Replacement by Plant Protein Blend on Growth and Flesh Quality of Japanese Seabass (Lateolabrax japonicus) and Siberian Sturgeon (Acipenser baeri Brandt)%混合植物蛋白质替代鱼粉对花鲈和西伯利亚鲟生长和肉质影响的比较研究

    Institute of Scientific and Technical Information of China (English)

    张志勇; 薛敏; 王嘉; 吴秀峰; 郑银桦; 韩芳

    2013-01-01

    A 16-week growth trial were conducted to compare the effects of fish meal replacement by plant protein blend (PPB) on growth and flesh quality of Japanese seabass (Lateolabrax japonicus) and Siberian sturgeon (Acipenser baeri Brandt).In control diets,56.9% and 51.0% of low-temperature steam dried fish meal (white fish meal) were used as an only protein source to formulate the diets containing 36% and 40% of crude protein for Japanese seabass and Siberian sturgeon,and named as LJ-FM and AB-FM,respectively.The other four iso-nitrogen and iso-energy diets were prepared to replace 25%,50%,75% and 100% fish meal of the control diet by PPB (soybean meal:wheat gluten meal was 1.00:1.67 and the crude protein content was 64.84%) and correspondingly named as LJ-PPB25,LJ-PPB50,LJ-PPB75,LJ-PPB100 and AB-PPB25,ABPPB50,AB-PPB75,AB-PPB100,respectively.There were 5 groups for each species with 4 replicates per group and 30 Japanese seabass or 22 Siberian sturgeon per replicate,and the Japanese seabass and Siberian sturgeon had the initial weight of (7.34 ±0.01) g and (49.48 ± 1.00) g,respectively.The results showed as follows:the feed intake rate (FIR) of Japanese seabass was significantly decreased when fish meal was replaced by PPB (P <0.05) ; LJ-PPB25 group had the highest value of the final body weight (FBW),and was significantly higher than LJ-PPB75 and LJ-PPB100 groups (P < 0.05) ; the feed conversation ratio (FCR) in LJ-PPB100 group was significantly higher than that in other groups (P < 0.05) ; the contents of moisture and crude ash in whole fish of Japanese seabass were significantly increased (P < 0.05),and the crude fat content was significantly decreased (P < 0.05),while the crude protein content and gross energy had no significant changes (P > 0.05).No significant differences in FIR,FBW,FCR and body composition of Siberian sturgeon were found among all groups (P > 0.05).Generally,each of muscle free amino acids (FAA) content of

  17. Kootenai River White Sturgeon Investigations; White Sturgeon Spawning and Recruitment Evaluation, 2003-2004 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Rust, Pete; Wakkinen, Virginia (Idaho Department of Fish and Game, Boise, ID)

    2005-06-01

    The objective of this research was to determine the environmental requirements for successful spawning and recruitment of the Kootenai River white sturgeon Acipenser transmontanus population. Annual tasks include monitoring and evaluating the various life stages of Kootenai River white sturgeon. Sampling for adult Kootenai River white sturgeon in 2003 began in March and continued through April. Eighty-one adult white sturgeon were captured with 3,576 hours of angling and set-lining effort in the Kootenai River. Discharge from Libby Dam and river stage at Bonners Ferry in 2003 peaked in May and early June. Flows remained above 500 m{sup 3}/s throughout June, decreased rapidly through mid July, and increased back to near 500 m{sup 3}/s after mid July and through mid August. By late August, flows had decreased to below 400 m{sup 3}/s. We monitored the movements of 24 adult sturgeon in Kootenay Lake, British Columbia (BC) and the Kootenai River from March 15, 2003 to August 31, 2003. Some of the fish were radio or sonic tagged in previous years. Twelve adult white sturgeon were moved upstream to the Hemlock Bar reach (rkm 260.0) and released as part of the Set and Jet Program. Transmitters were attached to seven of these fish, and their movements were monitored from the time of release until they moved downstream of Bonners Ferry. Eight additional radio-tagged white sturgeon adults were located in the traditional spawning reach (rkm 228-240) during May and June. Sampling with artificial substrate mats began May 21, 2003 and ended June 30, 2003. We sampled 717 mat d (a mat d is one 24 h set) during white sturgeon spawning. Three white sturgeon eggs were collected near Shortys Island on June 3, 2003, and five eggs were collected from the Hemlock Bar reach on June 5, 2003. Prejuvenile sampling began June 17, 2003 and continued until July 31, 2003. Sampling occurred primarily at Ambush Rock (rkm 244.0) in an attempt to document any recruitment that might have occurred from

  18. Emergency Fish Restoration Project; Final Report 2002.

    Energy Technology Data Exchange (ETDEWEB)

    LeCaire, Richard

    2003-03-01

    Lake Roosevelt is a 151-mile impoundment created by the construction of Grand Coulee Dam during the early 1940's. The construction of the dam permanently and forever blocked the once abundant anadromous fish runs to the upper Columbia Basin. Since the construction of Grand Coulee Dam in 1943 and Chief Joseph Dam in 1956 this area is known as the blocked area. The blocked area is totally dependant upon resident fish species to provide a subsistence, recreational and sport fishery. The sport fishery of lake Roosevelt is varied but consists mostly of Rainbow trout (Oncorhynchus mykiss), Kokanee salmon (Oncorhynchus nerka), Walleye (Stizostedion vitreum) Small mouth bass (Micropterus dolomieui) and white sturgeon (Acipenser transmontanus). Currently, Bonneville Power Administration funds and administers two trout/kokanee hatcheries on Lake Roosevelt. The Spokane Tribe of Indians operates one hatchery, the Washington Department of Fish and Wildlife the other. In addition to planting fish directly into Lake Roosevelt, these two hatcheries also supply fish to a net pen operation that also plants the lake. The net pen project is administered by Bonneville Power funded personnel but is dependant upon volunteer labor for daily feeding and monitoring operations. This project has demonstrated great success and is endorsed by the Colville Confederated Tribes, the Spokane Tribe of Indians, the Washington Department of Fish and Wildlife, local sportsmen associations, and the Lake Roosevelt Forum. The Lake Roosevelt/Grand Coulee Dam area is widely known and its diverse fishery is targeted by large numbers of anglers annually to catch rainbow trout, kokanee salmon, small mouth bass and walleye. These anglers contribute a great deal to the local economy by fuel, grocery, license, tackle and motel purchases. Because such a large portion of the local economy is dependant upon the Lake Roosevelt fishery and tourism, any unusual operation of the Lake Roosevelt system may have a

  19. Macro finance early warning system

    Institute of Scientific and Technical Information of China (English)

    Guihuan ZHENG; Xun ZHANG; Wei SHANG; Shanying XU

    2009-01-01

    In this paper, a financial early warning informa-tion system is developed based on the multi-dimensional cli-mate approach that is featured with a multi-dimensional in-dex construction and the relevant multi-dimensional analy-sis. Requirement analysis and design issues of building an information system supporting this multi-dimensional cli-mate approach are discussed in detail. And a case using this system to study the macro financial issues is presented to illustrate how the proposed multi-dimensional approach works in the information system we design. This research is an interdisciplinary work of economic theories, macro finan-cial empirical studies, and software engineering. With ad-vanced macro financial early warning theories implemented in a web application, the Macro Financial Early Warning System (FEWS) developed in this research has been proved to be effective in a trial running in the Forecasting research institute of the Chinese Academy of Sciences.

  20. Early Literacy and Early Numeracy: The Value of Including Early Literacy Skills in the Prediction of Numeracy Development

    Science.gov (United States)

    Purpura, David J.; Hume, Laura E.; Sims, Darcey M.; Lonigan, Cristopher J.

    2011-01-01

    The purpose of this study was to examine whether early literacy skills uniquely predict early numeracy skills development. During the first year of the study, 69 3- to 5-year-old preschoolers were assessed on the Preschool Early Numeracy Skills (PENS) test and the Test of Preschool Early Literacy Skills (TOPEL). Participants were assessed again a…

  1. Do Early Outs Work Out? Teacher Early Retirement Incentive Plans.

    Science.gov (United States)

    Brown, Herb R.; Repa, J. Theodore

    1993-01-01

    School districts offer teacher early retirement incentive plans (TERIPs) as an opportunity to hire less expensive teachers, reduce fringe benefits costs, and eliminate teaching positions. Discusses reasons for teachers to accept TERIP, and describes a computer model that allows school officials to calculate and compare costs incurred if an…

  2. Early exit: Estimating and explaining early exit from drug treatment

    Directory of Open Access Journals (Sweden)

    Sanders Melony

    2008-04-01

    Full Text Available Abstract Background Early exit (drop-out from drug treatment can mean that drug users do not derive the full benefits that treatment potentially offers. Additionally, it may mean that scarce treatment resources are used inefficiently. Understanding the factors that lead to early exit from treatment should enable services to operate more effectively and better reduce drug related harm. To date, few studies have focused on drop-out during the initial, engagement phase of treatment. This paper describes a mixed method study of early exit from English drug treatment services. Methods Quantitative data (n = 2,624 was derived from three English drug action team areas; two metropolitan and one provincial. Hierarchical linear modelling (HLM was used to investigate predictors of early-exit while controlling for differences between agencies. Qualitative interviews were conducted with 53 ex-clients and 16 members of staff from 10 agencies in these areas to explore their perspectives on early exit, its determinants and, how services could be improved. Results Almost a quarter of the quantitative sample (24.5% dropped out between assessment and 30 days in treatment. Predictors of early exit were: being younger; being homeless; and not being a current injector. Age and injection status were both consistently associated with exit between assessment and treatment entry. Those who were not in substitution treatment were significantly more likely to leave treatment at this stage. There were substantial variations between agencies, which point to the importance of system factors. Qualitative analysis identified several potential ways to improve services. Perceived problems included: opening hours; the service setting; under-utilisation of motivational enhancement techniques; lack of clarity about expectations; lengthy, repetitive assessment procedures; constrained treatment choices; low initial dosing of opioid substitution treatment; and the routine requirement

  3. Shocks in the Early Universe.

    Science.gov (United States)

    Pen, Ue-Li; Turok, Neil

    2016-09-23

    We point out a surprising consequence of the usually assumed initial conditions for cosmological perturbations. Namely, a spectrum of Gaussian, linear, adiabatic, scalar, growing mode perturbations not only creates acoustic oscillations of the kind observed on very large scales today, it also leads to the production of shocks in the radiation fluid of the very early Universe. Shocks cause departures from local thermal equilibrium as well as create vorticity and gravitational waves. For a scale-invariant spectrum and standard model physics, shocks form for temperatures 1  GeVUniverse as early as 10^{-30}  sec after the big bang.

  4. Gesturing in the early universities.

    Science.gov (United States)

    O'Boyle, C

    2000-01-01

    Research into the oral and literary traditions of scholastic education usually emphasizes the significance of the world in late medieval pedagogy. This paper suggests that coded hand signals provided early university scholars with an important non-verbal means of communication too. Using illustrations of classroom scenes from early university manuscripts, this paper analyzes the artistic conventions for representating gestures that these images embody. By building up a typology of these gesticulations, it demonstrates that the producers of these images and their audience shared a perception of scholastic education that embraced a sophisticated understanding of the activities associated with university education.

  5. Early Modern English:Morphology

    OpenAIRE

    2012-01-01

    By the end of the Middle English period there is already considerable loss of inflectional morphology, and in Early Modern English we see the last reflexes of a shift from synthetic Old English to analytic Modern English (Lass 1999: 139). In fact, the inflectional system of Early Modern English is not very different from what we have today (Go¨rlach 1991: 79). The changes in inflection which do take place between 1500 and 1700 show marked sociolinguistic differentiation and are the subject of...

  6. Early Planetary Differentiation: Comparative Planetology

    Science.gov (United States)

    Jones, John H.

    2006-01-01

    We currently have extensive data for four different terrestrial bodies of the inner solar system: Earth, the Moon, Mars, and the Eucrite Parent Body [EPB]. All formed early cores; but all(?) have mantles with elevated concentrations of highly sidero-phile elements, suggestive of the addition of a late "veneer". Two appear to have undergone extensive differentiation consistent with a global magma ocean. One appears to be inconsistent with a simple model of "low-pressure" chondritic differentiation. Thus, there seems to be no single, simple paradigm for understand-ing early differentiation.

  7. Early life origins of obesity.

    Science.gov (United States)

    Newnham, John P; Pennell, Craig E; Lye, Stephen J; Rampono, Jonathan; Challis, John R G

    2009-06-01

    There is increasing evidence that obesity has its origins in early life. Predisposition is based on interactions between the genome and environmental influences acting through epigenetic modifications. Individuals most at risk are those whose ancestral line has made a rapid transition from a traditional to a Westernized style of life. The process involves not only metabolism, but also behavior. As a result, those people who are most at risk of obesity may be those least likely to respond to educational programs based on lifestyle modification. Understanding the mechanisms and pathways that underpin the early origins of obesity is vital if we are to make progress in addressing this major problem of modern life.

  8. Early Childhood Intervention in China

    Science.gov (United States)

    Zheng, Yuzhu; Maude, Susan P.; Brotherson, Mary Jane

    2015-01-01

    With rapid economic development and increasing awareness of the importance of early childhood intervention (ECI), China is re-examining its social and educational practices for young children with disabilities. This re-examination may have a significant impact on young children with disabilities in China. It may also set an example for other…

  9. Early Childhood Inclusion in Croatia

    Science.gov (United States)

    Ljubešic, Marta; Šimleša, Sanja

    2016-01-01

    This article explains early childhood inclusion in Croatia from its beginnings up to challenges in current policy and practice. The first preschool education for children with disabilities dates back to the 1980s and was provided in special institutions. In the last 10 years, mainstream kindergartens have been enrolling children with disabilities…

  10. Early Childhood Inclusion in Australia

    Science.gov (United States)

    Kemp, Coral R.

    2016-01-01

    From the introduction of early intervention services in Australian in the mid-1970s, the families of children with intellectual and multiple disabilities have been encouraged to enroll their children in local preschools and childcare centers. Children with disabilities have also accessed a range of alternatives to full inclusion, such as reverse…

  11. Early Signs of Entrepreneurial Giftedness

    Science.gov (United States)

    Shavinina, Larisa V.

    2008-01-01

    Although successful entrepreneurship is important for the economic prosperity of any society, one should acknowledge that entrepreneurial giftedness is terra incognita from a research viewpoint. This article analyzes early manifestations of entrepreneurial giftedness in the cases of Richard Branson, Michael Dell, and Bill Gates and thus opens a…

  12. Glucocorticoids in early rheumatoid arthritis

    NARCIS (Netherlands)

    Everdingen, Amalia A. van

    2002-01-01

    For 50 years, glucocorticoids (GC) are used for symptomatic treatment of rheumatoid arthritis (RA). In the last decade, results from clinical studies of treatment with GC as additional therapy to long-acting antirheumatic drugs in patients with early RA suggested also disease-modifying properties of

  13. Intraovarian Control of Early Folliculogenesis

    NARCIS (Netherlands)

    Hsueh, Aaron J. W.; Kawamura, Kazuhiro; Cheng, Yuan; Fauser, Bart C. J. M.

    2015-01-01

    Although hormonal regulation of ovarian follicle development has been extensively investigated, most studies concentrate on the development of early antral follicles to the preovulatory stage, leading to the successful use of exogenous FSH for infertility treatment. Accumulating data indicate that p

  14. Early Writing: A Developmental Approach.

    Science.gov (United States)

    Goetz, Elizabeth; And Others

    This document consists of four papers on the acquisition of writing skills by young children. The first paper provides a historical and developmental perspective on early writing. Children's development of manual dexterity is briefly overviewed and aspects of the educational approaches of Pestalozzi, Montessori, Chomsky, Rogers and Ashton-Warner…

  15. Effects of Early Sun Exposure

    Science.gov (United States)

    ... can be harmful. It can lead to:Skin changes. Some skin cells with melanin can form a clump. This creates freckles and moles. Over time, these can develop cancer.Early aging. Time spent in the sun makes your skin age faster than normal. Signs of this are wrinkled, tight, or leathery ...

  16. Early Learning Theories Made Visible

    Science.gov (United States)

    Beloglovsky, Miriam; Daly, Lisa

    2015-01-01

    Go beyond reading about early learning theories and see what they look like in action in modern programs and teacher practices. With classroom vignettes and colorful photographs, this book makes the works of Jean Piaget, Erik Erikson, Lev Vygotsky, Abraham Maslow, John Dewey, Howard Gardner, and Louise Derman-Sparks visible, accessible, and easier…

  17. Bullying in Early Educational Settings

    Science.gov (United States)

    Kirves, Laura; Sajaniemi, Nina

    2012-01-01

    The aim of this research was to study the prevalence of bullying in early educational settings in Finnish kindergartens. In addition, the study investigated whether bullying in kindergartens differs from school bullying and what forms bullying takes among under-school-age children. Two kinds of data were collected for the study: data from a survey…

  18. Early Intervention Approaches. Chapter 9.

    Science.gov (United States)

    1996

    This collection of papers presented at a 1996 conference on children's mental health focuses on early intervention approaches. Papers have the following titles and authors: (1) "Child Maltreatment and Prenatal Exposure to Alcohol and Other Drugs: Some Preliminary Findings" (Patrick A. Curtis and Mary Wood Schneider); (2) "Evaluation…

  19. Choreography of early thalamocortical development.

    Science.gov (United States)

    Molnár, Zoltán; Higashi, Shuji; López-Bendito, Guillermina

    2003-06-01

    Thalamic axons, which carry most of the information from the sensory environment, are amongst the first projections to reach the cerebral cortex during embryonic development. It has been proposed that the scaffold of early generated cells in the ventral thalamus, internal capsule and preplate play a pivotal role in their deployment through sharp gene expression boundaries. These ideas were recently evaluated in various strains of mutant mice. In Tbr1, Gbx2, Pax6 KO both thalamic and corticofugal projections fail to traverse the striatocortical junction. In both Emx2 and Pax6 KO brains, the misrouted thalamic afferents are accompanied by displacements of the pioneering projections from the internal capsule. Regardless of their altered route, thalamic afferents in the reeler and L1 KO mice seem to be able to redistribute themselves on the cortical sheet and establish normal periphery-related representation in the somatosensory cortex. Early neural activity delivered through the thalamic projections is thought to be involved in the realignment process of thalamic axons at the time of their accumulation in the subplate layer. However, axonal growth and the early topographic arrangement of thalamocortical fiber pathways appear normal in the Snap25 KO, where action potential mediated synaptic vesicle release is disrupted. We therefore suggest that intercellular communication mediated by constitutive secretion of transmitters or growth factors might play a dominant role during early thalamocortical development.

  20. Early School Leaving in Scandinavia

    DEFF Research Database (Denmark)

    Jakobsen, Vibeke; Bäckman, Olof; Lorentzen, Thomas;

    2015-01-01

    The article explores the extent to which the organization of vocational tracks in upper secondary school affects the labour market risks associated with early school exit. The Nordic countries share many features, but the upper secondary school systems differ significantly in how their vocational...

  1. Sustainable early-career networks

    Science.gov (United States)

    Rauser, Florian; Schemann, Vera; Sonntag, Sebastian

    2015-10-01

    A truly global science community for the next generation of researchers will be essential if we are to tackle Earth system sustainability. Top-down support from funders should meet bottom-up initiatives -- at a pace fast enough to meet that of early-career progress.

  2. HPLC: Early and Recent Perspectives.

    Science.gov (United States)

    Karger, Barry L.

    1997-01-01

    Provides a perspective on what it was like in the early days of high-performance liquid chromatography (HPLC) and several of the key developments. Focuses on the advances in HPLC generally, and more specifically for the biological sciences, that were necessary for the method to reach the preeminent stage of today. Contains 20 references. (JRH)

  3. Defeating cancer with early detection

    CERN Multimedia

    2003-01-01

    A meeting of scientists and industry experts will hold an open review of the Three Dimension Complete Body Screening System (3D-CBS) on the 1st of July 2003. This new imaging technlogy is potentially powerful and safe enough to offer routine screening of healthy patients for early signs of cancer (1 page).

  4. Excess Early Mortality in Schizophrenia

    DEFF Research Database (Denmark)

    Laursen, Thomas Munk; Nordentoft, Merete; Mortensen, Preben Bo

    2014-01-01

    Schizophrenia is often referred to as one of the most severe mental disorders, primarily because of the very high mortality rates of those with the disorder. This article reviews the literature on excess early mortality in persons with schizophrenia and suggests reasons for the high mortality as ...

  5. Boys' Bodies in Early Childhood

    Science.gov (United States)

    Drummond, Murray

    2012-01-01

    This paper is based on qualitative research data from a project investigating early childhood boys' constructions of masculinities in relation to sport, health and the body. The focus group data, with 33 boys, has been collected in each of the boys' first three years at school. It is part of the data that will be collected over eight years with…

  6. Early Children's Literature and Aging

    Science.gov (United States)

    McGuire, Sandra L.

    2016-01-01

    Increased longevity is a worldwide phenomenon placing emphasis on the need for preparation for life's later years. Today's children will be the older adults of tomorrow. A resource that can help to educate them about aging and prepare them for the long life ahead is early children's literature (Preschool-Primary). This literature can provide…

  7. The Climate of Early Mars

    Science.gov (United States)

    Wordsworth, Robin D.

    2016-06-01

    The nature of the early martian climate is one of the major unanswered questions of planetary science. Key challenges remain, but a new wave of orbital and in situ observations and improvements in climate modeling have led to significant advances over the past decade. Multiple lines of geologic evidence now point to an episodically warm surface during the late Noachian and early Hesperian periods 3-4 Ga. The low solar flux received by Mars in its first billion years and inefficiency of plausible greenhouse gases such as CO2 mean that the steady-state early martian climate was likely cold. A denser CO2 atmosphere would have caused adiabatic cooling of the surface and hence migration of water ice to the higher-altitude equatorial and southern regions of the planet. Transient warming caused melting of snow and ice deposits and a temporarily active hydrological cycle, leading to erosion of the valley networks and other fluvial features. Precise details of the warming mechanisms remain unclear, but impacts, volcanism, and orbital forcing all likely played an important role. The lack of evidence for glaciation across much of Mars's ancient terrain suggests the late Noachian surface water inventory was not sufficient to sustain a northern ocean. Though mainly inhospitable on the surface, early Mars may nonetheless have presented significant opportunities for the development of microbial life.

  8. Early Childhood Educator's Nutrition Handbook.

    Science.gov (United States)

    Olson, Christine; And Others

    This nutrition handbook is designed to provide enough information on nutrition and food habits to enable early childhood educators to add a nutrition dimension to children's learning activities. Topics covered are the role of nutrition in growth during the preschool years; nutrients and their functions; selecting a healthy diet; common nutritional…

  9. Famines in Africa: is early warning early enough?

    Directory of Open Access Journals (Sweden)

    Jeeyon Janet Kim

    2012-06-01

    Full Text Available Following the second Sahelian famine in 1984–1985, major investments were made to establish Early Warning Systems. These systems help to ensure that timely warnings and vulnerability information are available to decision makers to anticipate and avert food crises. In the recent crisis in the Horn of Africa, alarming levels of acute malnutrition were documented from March 2010, and by August 2010, an impending food crisis was forecast. Despite these measures, the situation remained unrecognised, and further deteriorated causing malnutrition levels to grow in severity and scope. By the time the United Nations officially declared famine on 20 July 2011, and the humanitarian community sluggishly went into response mode, levels of malnutrition and mortality exceeded catastrophic levels. At this time, an estimated 11 million people were in desperate and immediate need for food. With warnings of food crises in the Sahel, South Sudan, and forecast of the drought returning to the Horn, there is an immediate need to institutionalize change in the health response during humanitarian emergencies. Early warning systems are only effective if they trigger an early response.

  10. Planck Early Results: The Early Release Compact Source Catalog

    CERN Document Server

    Ade, P A R; Arnaud, M; Ashdown, M; Aumont, J; Baccigalupi, C; Balbi, A; Banday, A J; Barreiro, R B; Bartlett, J G; Battaner, E; Benabed, K; Benoît, A; Bernard, J -P; Bersanelli, M; Bhatia, R; Bonaldi, A; Bonavera, L; Bond, J R; Borrill, J; Bouchet, F R; Bucher, M; Burigana, C; Butler, R C; Cabella, P; Cantalupo, C M; Cappellini, B; Cardoso, J -F; Catalano, A; Cayón, L; Challinor, A; Chamballu, A; Chary, R -R; Chen, X; Chiang, L -Y; Chiang, C; Christensen, P R; Clements, D L; Colombi, S; Couchot, F; Coulais, A; Crill, B P; Cuttaia, F; Danese, L; Davis, R J; de Bernardis, P; de Rosa, A; de Zotti, G; Delabrouille, J; Delouis, J -M; Désert, F -X; Dickinson, C; Diego, J M; Dolag, K; Dole, H; Donzelli, S; Doré, O; Dörl, U; Douspis, M; Dupac, X; Efstathiou, G; En\\sslin, T A; Eriksen, H K; Finelli, F; Forni, O; Fosalba, P; Frailis, M; Franceschi, E; Galeotta, S; Ganga, K; Giard, M; Giraud-Héraud, Y; González-Nuevo, J; Górski, K M; Gratton, S; Gregorio, A; Gruppuso, A; Haissinski, J; Hansen, F K; Harrison, D; Helou, G; Henrot-Versillé, S; Hernández-Monteagudo, C; Herranz, D; Hildebrandt, S R; Hivon, E; Hobson, M; Holmes, W A; Hornstrup, A; Hovest, W; Hoyland, R J; Huffenberger, K M; Huynh, M; Jaffe, A H; Jones, W C; Juvela, M; Keihänen, E; Keskitalo, R; Kisner, T S; Kneissl, R; Knox, L; Kurki-Suonio, H; Lagache, G; Lähteenmäki, A; Lamarre, J -M; Lasenby, A; Laureijs, R J; Lawrence, C R; Leach, S; Leahy, J P; Leonardi, R; León-Tavares, J; Leroy, C; Lilje, P B; Linden-V\\ornle, M; López-Caniego, M; Lubin, P M; Macías-Pérez, J F; MacTavish, C J; Maffei, B; Maggio, G; Maino, D; Mandolesi, N; Mann, R; Maris, M; Marleau, F; Marshall, D J; Martínez-González, E; Masi, S; Massardi, M; Matarrese, S; Matthai, F; Mazzotta, P; McGehee, P; Meinhold, P R; Melchiorri, A; Melin, J -B; Mendes, L; Mennella, A; Mitra, S; Miville-Deschênes, M -A; Moneti, A; Montier, L; Morgante, G; Mortlock, D; Munshi, D; Murphy, A; Naselsky, P; Natoli, P; Netterfield, C B; N\\orgaard-Nielsen, H U; Noviello, F; Novikov, D; Novikov, I; O'Dwyer, I J; Osborne, S; Pajot, F; Paladini, R; Partridge, B; Pasian, F; Patanchon, G; Pearson, T J; Perdereau, O; Perotto, L; Perrotta, F; Piacentini, F; Piat, M; Piffaretti, R; Plaszczynski, S; Platania, P; Pointecouteau, E; Polenta, G; Ponthieu, N; Poutanen, T; Pratt, G W; Prézeau, G; Prunet, S; Puget, J -L; Rachen, J P; Reach, W T; Rebolo, R; Reinecke, M; Renault, C; Ricciardi, S; Riller, T; Ristorcelli, I; Rocha, G; Rosset, C; Rowan-Robinson, M; Rubi\; Rusholme, B; Sajina, A; Sandri, M; Santos, D; Savini, G; Schaefer, B M; Scott, D; Seiffert, M D; Shellard, P; Smoot, G F; Starck, J -L; Stivoli, F; Stolyarov, V; Sudiwala, R; Sunyaev, R; Sygnet, J -F; Tauber, J A; Tavagnacco, D; Terenzi, L; Toffolatti, L; Tomasi, M; Torre, J -P; Tristram, M; Tuovinen, J; Türler, M; Umana, G; Valenziano, L; Valiviita, J; Varis, J; Vielva, P; Villa, F; Vittorio, N; Wade, L A; Wandelt, B D; White, S D M; Wilkinson, A; Yvon, D; Zacchei, A; Zonca, A

    2011-01-01

    A brief description of the methodology of construction, contents and usage of the Planck Early Release Compact Source Catalogue (ERCSC), including the Early Cold Cores (ECC) and the Early Sunyaev-Zeldovich (ESZ) cluster catalogue is provided. The catalogue is based on data that consists of mapping the entire sky once and 60% of the sky a second time by Planck. A Monte-Carlo algorithm based on the injection and extraction of artificial sources into the Planck maps was implemented to select reliable sources among all extracted candidates such that the cumulative reliability of the catalogue is >=90%. As a result of the Monte-Carlo assessment of the reliability of sources from different techniques, the PowellSnakes source extraction technique was used at the 5 frequencies between 30 and 143 GHz while the SExtractor technique was used between 217 and 857 GHz. The 10 sigma photometric flux density limit of the catalogue at |b|>30 deg is 0.49, 1.0, 0.67, 0.5, 0.33, 0.28, 0.25, 0.47 and 0.82 Jy at each of the nine f...

  11. Pompe disease: early diagnosis and early treatment make a difference.

    Science.gov (United States)

    Chien, Yin-Hsiu; Hwu, Wuh-Liang; Lee, Ni-Chung

    2013-08-01

    Pompe disease (glycogen storage disease type II or acid maltase deficiency) is a lysosomal disorder in which acid α-glucosidase (GAA) deficiencies lead to intralysosomal accumulation of glycogen in all tissues; most notably in skeletal muscles. Both the patient's age at the onset of Pompe disease symptoms and the rate of deterioration caused by the disease can vary considerably. In classical infant-onset Pompe disease (IOPD), symptoms start very early in life, and death occurs soon afterward if the disease remains untreated. In later-onset Pompe disease, symptoms are slower to appear, and patients often progress to wheelchair confinement and eventual respiratory failure. A diagnosis can be made by screening for GAA in dried blood samples, followed either by GAA assessment in lymphocytes or in fibroblasts or by the genetic analysis of mutations. Treatment by enzyme replacement therapy (ERT) with alglucosidase alfa was approved for human use in 2006. In classical IOPD, treatment significantly lengthens survival and improves motor development and cardiac function. The sooner ERT begins, the better are the results. Newborn screening aims to take advantage of different technologies for diagnosing and treating newborns early on and it yields better outcomes. However, newborns diagnosed early and other long-term survivors may encounter fresh problems, making up a new phenotype of IOPD patients. Further modifications of the treatment, such as a decrease in immune responses to ERT, a higher dosage, a better uptake formulation, and gene therapy delivered locally or systemically are being explored.

  12. Epidemiology of early neonatal mortality.

    Science.gov (United States)

    Tyagi, N K; Bharambe, M S; Garg, B S; Mathur, J S; Goswami, K

    1994-01-01

    During 1981-1991 at a rural teaching hospital (Kasturba Hospital) of Mahatma Gandhi Institute of Medical Sciences in Sevagram, Wardha, India, 454 of 13,939 newborns died during the early neonatal period for an early neonatal mortality rate (ENMR) of 33.7/1000 live births. The ENMR for boys was not significantly different from that for girls (36.1 vs. 28.6). Community medicine specialists analyzed data on these early neonatal deaths to examine distribution of early neonatal mortality, especially its relationship with prematurity, low birth weight, birth order, and by sex. They calculated average percent deaths (APD) per hour to examine the dynamics in early neonatal mortality. The mean age at death was lower among newborns of birth order greater than 2 than those of birth order less than 2 (23.47 vs. 26.85 hours; p 0.001). ENMR was higher for newborns of birth order greater than 2 than those of birth order less than 2 (41.74% vs. 27.35%; P 0.001). The mean age at death increased as gestation increased (10.34 for 28 weeks; 24.27 for 28-33 weeks, 31.53 for 33-37 weeks, and 34.43 for 37 weeks; p 0.001). ENMR decreased as gestation increased (850 for 28 weeks; 375 for 28-33 weeks, 147.02 for 33-37 weeks, and 8.77 for 37 weeks; p 0.001). The mean age at death increased as birth weight increased for newborns weighing less than 1500 gms through 2000-2500 gms (23.36-37.13 hours; p 0.001). It was lowest among those weighing more 3000 gms (11.55 gms). ENMR fell as birth weight increased (614.33 for 1500 gms, 116.19 for 1500-2000 gms, 19.38 for 2000-2500 gms, 10.99 for 2500-3000 gms, and 5.41 for 3000 gms; p 0.001). The APD/hour for the first hour of life was 3.74% for a relative risk of 12.9. It decreased steadily as the hours of life increased (3.08% for 1-6 hours, 1.19% for 6-24 hours, 0.67% for 24-72 hours, and 0.29% for 72-168 hours). Knowledge of time of likely death can help providers know where they need to focus their attention to prevent early neonatal deaths.

  13. Early detection of tubular dysfunction.

    Science.gov (United States)

    Piscator, M

    1991-11-01

    The determination of low-molecular-weight proteins in urine as a tool for early detection of damage to the proximal tubules is briefly discussed. Beta 2-microglobulin, retinol-binding protein and alpha 1-microglobulin are at present the most widely used markers for tubular dysfunction. The determination of beta 2-microglobulin has earlier been the method of choice, but due to its instability at low pH there are certain disadvantages. Available data indicate that alpha 1-microglobulin may replace beta 2-microglobulin for screening purposes. The low-molecular-weight proteins are at present the best markers for early detection of tubular dysfunction; other constituents are not as well suited for this, even if the determination of urine enzymes has its supporters.

  14. Proteomics of early zebrafish embryos

    Directory of Open Access Journals (Sweden)

    Heisenberg Carl-Philipp

    2006-01-01

    Full Text Available Abstract Background Zebrafish (D. rerio has become a powerful and widely used model system for the analysis of vertebrate embryogenesis and organ development. While genetic methods are readily available in zebrafish, protocols for two dimensional (2D gel electrophoresis and proteomics have yet to be developed. Results As a prerequisite to carry out proteomic experiments with early zebrafish embryos, we developed a method to efficiently remove the yolk from large batches of embryos. This method enabled high resolution 2D gel electrophoresis and improved Western blotting considerably. Here, we provide detailed protocols for proteomics in zebrafish from sample preparation to mass spectrometry (MS, including a comparison of databases for MS identification of zebrafish proteins. Conclusion The provided protocols for proteomic analysis of early embryos enable research to be taken in novel directions in embryogenesis.

  15. Nanotechnology for Early Cancer Detection

    Directory of Open Access Journals (Sweden)

    Joon Won Park

    2010-01-01

    Full Text Available Vast numbers of studies and developments in the nanotechnology area have been conducted and many nanomaterials have been utilized to detect cancers at early stages. Nanomaterials have unique physical, optical and electrical properties that have proven to be very useful in sensing. Quantum dots, gold nanoparticles, magnetic nanoparticles, carbon nanotubes, gold nanowires and many other materials have been developed over the years, alongside the discovery of a wide range of biomarkers to lower the detection limit of cancer biomarkers. Proteins, antibody fragments, DNA fragments, and RNA fragments are the base of cancer biomarkers and have been used as targets in cancer detection and monitoring. It is highly anticipated that in the near future, we might be able to detect cancer at a very early stage, providing a much higher chance of treatment.

  16. Embryology of the early foregut.

    Science.gov (United States)

    Metzger, Roman; Wachowiak, Robin; Kluth, Dietrich

    2011-08-01

    In embryology, no agreement exists how the early foregut differentiates into the respiratory tract and the intestinal tract. In particular, the formation of the early lung anlage as well as the process of separation of trachea and esophagus remains unclear. This process is explained in a rather schematic way and aims more to explain pathologic findings, whereas true embryologic investigations are extremely rare in this field. Here, scanning electron microscopy of the normal foregut development illustrates the steps, which finally leads to the development of larynx and trachea on the one hand, and pharynx and esophagus on the other hand. This study was performed in chicken embryos in accordance to the developmental stages described. As the main results from these illustrations show, we found no evidence for lateral foregut ridges inside the undivided foregut chamber and no fusion of lateral foregut components to form a trachea-esophageal septum.

  17. Health lifestyles in early childhood.

    Science.gov (United States)

    Mollborn, Stefanie; James-Hawkins, Laurie; Lawrence, Elizabeth; Fomby, Paula

    2014-12-01

    This study integrates two important developments, the concept of health lifestyles (which has focused on adults and adolescents) and the increased attention to early childhood. We introduce the concept of children's health lifestyles, identifying differences from adult health lifestyles and articulating intergenerational transmission and socialization processes shaping children's health lifestyles. Using the nationally representative Early Childhood Longitudinal Study-Birth Cohort (2001-2007; N ≈ 6,150), latent class analyses identify predominant health lifestyles among U.S. preschoolers. Five distinct empirical patterns representing health lifestyles emerge, two capturing low and medium levels of overall risk across domains and three capturing domain-specific risks. Social background predicts children's health lifestyles, but lower household resources often explain these relationships. Across kindergarten measures of cognition, behavior, and health, preschool health lifestyles predict children's development even after controlling for social disadvantage and concurrent household resources. Further research on health lifestyles throughout childhood is warranted.

  18. Shocks in the Early Universe

    CERN Document Server

    Pen, Ue-Li

    2015-01-01

    We point out a surprising consequence of the usually assumed initial conditions for cosmological perturbations. Namely, a scale-invariant spectrum of Gaussian, linear, adiabatic, scalar, growing mode perturbations not only creates acoustic oscillations, of the kind observed in great detail on large scales today, it also leads to the production of shock waves in the radiation fluid of the very early universe. At very early epochs, $1$ GeV$

  19. Early Management and Fluid Resuscitation

    Directory of Open Access Journals (Sweden)

    Kaya Yorgancı

    2011-07-01

    Full Text Available Initial management of severely burned patient is similar with a trauma victim. Determination of airway patency, evaluation of respiration and circulation, early recognition of concomitant trauma has vital importance in burn patients. In the early phase, mortality mainly depends on missed or un-treated severe injuries or pathologies, but not burn injury itself.In patients that have TBSA greater than 15 %, fluid resuscitation should be started. In the first 24 hours, crystalloid solutions should be preferred. .Several formulas can guide fluid resuscitation; however the amount of fluid that is given to the patient should be individualized according to the patient’s need. (Journal of the Turkish Society Intensive Care 2011; 9 Suppl: 7-10

  20. Early Detection of Disease Outbreaks

    OpenAIRE

    2005-01-01

    BACKGROUND: The ability to detect disease outbreaks early is important in order to minimize morbidity and mortality through timely implementation of disease prevention and control measures. Many national, state, and local health departments are launching disease surveillance systems with daily analyses of hospital emergency department visits, ambulance dispatch calls, or pharmacy sales for which population-at-risk information is unavailable or irrelevant. METHODS AND FINDINGS: We propose a pr...

  1. Interpersonal relationships in early adulthood

    OpenAIRE

    2014-01-01

    Interpersonal relationships in early adulthood, in people aged 25 to 30 vary considerably among individuals. Some place emphasis on partnership, and others on relations with friends. Even the relationship with parents and siblings are experienced by young adults in a variety of ways. Some have frequent and regular contact with their parents while some no longer have any relationship with their parents. These are two frequent situations hiding much more in between. Relationships are complex an...

  2. The Climate of Early Mars

    CERN Document Server

    Wordsworth, Robin

    2016-01-01

    The nature of the early Martian climate is one of the major unanswered questions of planetary science. Key challenges remain, but a new wave of orbital and in situ observations and improvements in climate modeling have led to significant advances over the last decade. Multiple lines of geologic evidence now point to an episodically warm surface during the late Noachian and early Hesperian periods 3-4 Ga. The low solar flux received by Mars in its first billion years and inefficiency of plausible greenhouse gases such as CO2 means that the steady-state early Martian climate was likely cold. A denser CO2 atmosphere would have caused adiabatic cooling of the surface and hence migration of water ice to the higher altitude equatorial and southern regions of the planet. Transient warming caused melting of snow and ice deposits and a temporarily active hydrological cycle, leading to erosion of the valley networks and other fluvial features. Precise details of the warming mechanisms remain unclear, but impacts, volca...

  3. Planets in the Early Universe

    CERN Document Server

    Shchekinov, Yu A; Murthy, J

    2012-01-01

    Several planets have recently been discovered around old and metal-poor stars, implying that the planets are also old, formed in the early universe. The canonical theory suggests that the conditions for their formation could not have existed at such early epochs. The required conditions such as sufficiently high dust-to-gas ratio, could in fact have existed in the early universe immediately following the first episode of metal production. Metal-rich regions may have existed in multiple isolated pockets of enriched and weakly-mixed gas close to the massive stars. Observations of quasars and gamma-ray bursts show a very wide spread of metals in absorption from $\\rm [X/H] \\simeq -3$ to $\\simeq -0.5$. This suggests that physical conditions in the metal-abundant clumps could have been similar to where protoplanets form today. However, planets could have formed even in low-metallicity environments, where formation of stars is expected to proceed at higher densities. In such cases, the circumstellar accretion disks ...

  4. Oxygen and Early Animal Evolution

    Science.gov (United States)

    Xiao, S.

    2012-12-01

    It is often hypothesized that the rise of animals was triggered by an increase in O2 levels in the atmosphere and oceans. However, this hypothesis is remarkably difficult to test, because the timing of animal divergences is poorly resolved, the physiology of early animals is often unknown, estimates of past pO2 levels come with large error bars, and causal relationships between oxygenation and animal evolution are difficult to establish. Nonetheless, existing phylogenetic, paleontological, and geochemical data indicate that the evolution of macroscopic animals and motile macrometazoans with energetically expensive lifestyles may be temporally coupled with ocean oxygenation events in the Ediacaran Period. Thus, it is plausible that ocean oxygenation may have been a limiting factor in the early evolution of macroscopic, complex, and metabolically aggressive animals (particularly bilaterian animals). However, ocean oxygenation and animal evolution were likely engaged in two-way interactions: Ediacaran oxygenation may have initially lifted a physiological barrier for the evolution of animal size, motility, and active lifestyles, but subsequent animal diversification in the Paleozoic may have also changed oceanic redox structures. Viewed in a broader context, the early evolutionary history of animals was contingent upon a series of events, including genetic preparation (developmental genetics), environmental facilitation (oceanic oxygenation), and ecological escalation (Cambrian explosion), but the rise of animals to ecological importance also had important geobiological impacts on oceanic redox structures, sedimentary fabrics, and global geochemical cycles.

  5. Can Thyroid Cancer Be Found Early?

    Science.gov (United States)

    ... Thyroid Cancer Early Detection, Diagnosis, and Staging Can Thyroid Cancer Be Found Early? Many cases of thyroid cancer ... Health Care Team About Thyroid Cancer? More In Thyroid Cancer About Thyroid Cancer Causes, Risk Factors, and Prevention ...

  6. An Early Retirement Option for Australian Academics?

    Science.gov (United States)

    Over, Ray

    1987-01-01

    Issues of early retirement of college and university faculty are examined as they relate to Australia's aging faculty population, and the conditions necessary to promote early retirement successfully in this context are considered. (MSE)

  7. Do 'Early Birds' Get the Healthier Worm?

    Science.gov (United States)

    ... medlineplus.gov/news/fullstory_163902.html Do 'Early Birds' Get the Healthier Worm? Late-to-bed types ... 2017 FRIDAY, March 3, 2017 (HealthDay News) -- Early birds may have a leg up over night owls ...

  8. Can Thymus Cancer Be Found Early?

    Science.gov (United States)

    ... Thymus Cancer Early Detection, Diagnosis, and Staging Can Thymus Cancer Be Found Early? Screening is testing for ... Ask Your Doctor About Thymus Cancer? More In Thymus Cancer About Thymus Cancer Causes, Risk Factors, and ...

  9. Early detection of first-episode psychosis

    DEFF Research Database (Denmark)

    Larsen, Tor K; Melle, Ingrid; Auestad, Bjørn

    2006-01-01

    Early intervention is assumed to improve outcome in first-episode psychosis, but this has not been proven.......Early intervention is assumed to improve outcome in first-episode psychosis, but this has not been proven....

  10. Early Identification of Psychosis: A Primer

    OpenAIRE

    Early Psychosis Initiative of British Columbia

    2000-01-01

    This document is an educational resource concerning the early identification of psychosis. Primary topics addressed include: an outline of the importance of early intervention; signs and symptoms of psychosis; and strategies for recognizing psychosis.  

  11. Can Testicular Cancer Be Found Early?

    Science.gov (United States)

    ... Testicular Cancer Early Detection, Diagnosis, and Staging Can Testicular Cancer Be Found Early? Most testicular cancers can be ... Ask Your Doctor About Testicular Cancer? More In Testicular Cancer About Testicular Cancer Causes, Risk Factors, and Prevention ...

  12. Early School Dropout: Configurations and Determinants.

    Science.gov (United States)

    Cairns, Robert B.; And Others

    1989-01-01

    Examined behavioral, cognitive, and demographic factors associated with early school dropout in 475 seventh graders. Clusters of students most vulnerable to early school dropout were characterized by high levels of aggressiveness and low levels of academic performance. (RJC)

  13. Genetics Home Reference: early-onset glaucoma

    Science.gov (United States)

    ... Home Health Conditions early-onset glaucoma early-onset glaucoma Enable Javascript to view the expand/collapse boxes. Download PDF Open All Close All Description Glaucoma is a group of eye disorders in which ...

  14. Breast Cancer Early Detection and Diagnosis

    Science.gov (United States)

    ... En Español Category Cancer A-Z Breast Cancer Breast Cancer Early Detection and Diagnosis Breast cancer is sometimes ... cancer screening is so important. Learn more. Can Breast Cancer Be Found Early? Breast cancer is sometimes found ...

  15. Early detection of contagious diseases

    Science.gov (United States)

    Colston, Jr., Billy W.; Milanovich, Fred P.; Estacio, Pedro; Chang, John

    2011-08-09

    This invention provides an electronic proximity apparatus and a surveillance method using such an apparatus for alerting individuals that are exposed to a contagious disease. When a person becomes symptomatic and is diagnosed as positive for a given contagious agent, individuals that have recently maintained a threshold proximity with respect to an infected individual are notified and advised to seek immediate medial care. Treatment of individuals in the very early phases of infection (pre-symptomatic) significantly reduces contagiousness of the infected population first exposed to the contagious disease, thus preventing spread of the disease throughout the general population.

  16. Early Detection of Ovarian Cancer

    Directory of Open Access Journals (Sweden)

    Donna Badgwell

    2007-01-01

    Full Text Available Despite advances in therapy, ovarian cancer remains the most deadly of the gynecological cancers. Less than 30% of women with advanced stage disease survive long-term. When diagnosed in stage I, up to 90% of patients can be cured with conventional surgery and chemotherapy. At present, only 25% of ovarian cancers are detected in stage I due, in part, to the absence of specific symptoms and to lack of an effective screening strategy. Early detection of ovarian cancer might significantly improve the overall survival rate of women with ovarian cancer if 1 most cancers are clonal and unifocal, arising in the ovary rather than in the peritoneum, 2 metastatic disease results from progression of clinically detectable stage I lesions, and 3 cancers remain localized for a sufficient interval to permit cost-effective screening. Given the prevalence of ovarian cancer, strategies for early detection must have high sensitivity for early stage disease (> 75%, but must have extremely high specificity (99.6% to attain a positive predictive value of at least 10%. Transvaginal sonography (TVS, serum markers and a combination of the two modalities have been evaluated for early detection of ovarian cancer. Among the serum markers, CA125 has received the most attention, but lacks the sensitivity or specificity to function alone as a screening test. Greater specificity can be achieved by combining CA125 and TVS and/or by monitoring CA125 over time. Two stage screening strategies promise to be cost effective, where abnormal serum assays prompt TVS to detect lesions that require laparotomy. Accrual has been completed for a 200,000 woman trial in the United Kingdom that will test the ability of a rising CA125 to trigger TVS and subsequent exploratory surgery. Given the heterogeneity of ovarian cancer, it is unlikely that any single marker will be sufficiently sensitive to provide an effective initial screen. Sensitivity of serum assays might be enhanced by utilizing a

  17. Early management of acute pancreatitis.

    Science.gov (United States)

    Schepers, Nicolien J; Besselink, Marc G H; van Santvoort, Hjalmar C; Bakker, Olaf J; Bruno, Marco J

    2013-10-01

    Acute pancreatitis is the most common gastro-intestinal indication for acute hospitalization and its incidence continues to rise. In severe pancreatitis, morbidity and mortality remains high and is mainly driven by organ failure and infectious complications. Early management strategies should aim to prevent or treat organ failure and to reduce infectious complications. This review addresses the management of acute pancreatitis in the first hours to days after onset of symptoms, including fluid therapy, nutrition and endoscopic retrograde cholangiography. This review also discusses the recently revised Atlanta classification which provides new uniform terminology, thereby facilitating communication regarding severity and complications of pancreatitis.

  18. Early detection of congenital syphilis

    Directory of Open Access Journals (Sweden)

    Nagalakshmi Chowdhary

    2014-01-01

    Full Text Available Late congenital syphilis is a very rare clinical entity, and its early diagnosis and treatment is essential. Dental findings often provide valuable evidence for the diagnosis of late congenital syphilis. It occurs due to the transmission of the disease from an infected mother to her fetus through placenta. This long forgotten disease continues to effect pregnant women resulting in perinatal morbidity and mortality. Congenital syphilis is a preventable disease, and its presence reflects a failure of prenatal care delivery system, as well as syphilis control programs. We are reporting a case of late congenital syphilis with only Hutchinson′s teeth.

  19. Early planetary differentiation: Geophysical consequences

    Science.gov (United States)

    Schubert, G.

    1992-01-01

    Differentiation of a planet can have profound consequences for its structure and thermal evolution, including core formation and crystal growth. Recent theories for the origin and evolution of the terrestrial planets and the Moon have all these bodies forming hot and cooling thereafter. Early core formation, and in the cases of Earth and Moon, a deep magma ocean possibly encompassing the entire mantle are characteristic features of these models. Secular cooling of Mars from a hot origin and cooling of Moon from a hot initial state with a deep magma ocean have been criticized on the basis of their tectonic implications. The cases of Mars and the Moon are discussed.

  20. Early Childhood Inclusion in the United Kingdom

    Science.gov (United States)

    Blackburn, Carolyn

    2016-01-01

    A policy-to-practice paper is presented of early childhood inclusion in England. The article aims to report the benefits of early intervention services and early childhood inclusion for children with special educational needs and disabilities (SEND), document the chronology of policy development, and discuss research evidence about…

  1. Ethics dilemmas of early detection of obesity

    DEFF Research Database (Denmark)

    Vallgårda, Signild

    2016-01-01

    Aim: To discuss the ethics dilemmas of the early detection of overweight and obesity. Methods: Analysis of the ethical aspects of early detection. Results: The early detection of overweight and obesity entails a number of ethical dilemmas because it may both be helpful and harmful. It may help...

  2. Project ELI: Improving Early Literacy Outcomes

    Science.gov (United States)

    Young, Robin Miller; Chandler, Lynette K.; Shields, LuAnn; Laubenstein, Pam; Butts, Jill; Black, Kristine

    2008-01-01

    Early childhood and elementary-level educators are engaging in conversations about how to coordinate their efforts to develop fluent readers. There is evidence that key early literacy skills that are predictive of subsequent literacy achievement in kindergarten and first grade can be taught to preschool-age children. Moreover, early childhood…

  3. Early Smoking, Education, and Labor Market Performance

    NARCIS (Netherlands)

    Palali, Ali

    2015-01-01

    This study investigates the effects of early smoking on educational attainment and labor market performance. The results show that early smoking adversely affects educational attainment and initial labor market performance, but only for males. The effect of early smoking on initial labor market perf

  4. Early identification and intervention in cerebral palsy

    DEFF Research Database (Denmark)

    Herskind, Anna; Greisen, Gorm; Nielsen, Jens Bo

    2015-01-01

    Infants with possible cerebral palsy (CP) are commonly assumed to benefit from early diagnosis and early intervention, but substantial evidence for this is lacking. There is no consensus in the literature on a definition of 'early', but this review focuses on interventions initiated within the fi...

  5. Early infection and prognosis after acute stroke

    DEFF Research Database (Denmark)

    Kammersgaard, L P; Jørgensen, H S; Reith, J;

    2001-01-01

    Infection is a frequent complication in the early course of acute stroke and may adversely affect stroke outcome. In the present study, we investigate early infection developing in patients within 3 days of admission to the hospital and its independent relation to recovery and stroke outcome....... In addition, we identify predictors for early infections, infection subtypes, and their relation to initial stroke severity....

  6. Early Learning and Educational Technology Policy Brief

    Science.gov (United States)

    Lee, Joan

    2016-01-01

    Recognizing the growth of technology use in early learning settings, the U.S. Department of Education and U.S. Department of Health and Human Services collaborated in the development of the "Early Learning and Educational Technology Policy Brief" to promote developmentally appropriate use of technology in homes and early learning…

  7. [Early diagnosis of ectopic pregnancy].

    Science.gov (United States)

    Belics, Zoran; Gérecz, Balázs; Csákány, M György

    2014-07-20

    Ectopic pregnancy is a high-risk condition that occurs in 2% of reported pregnancies. This percentage is fivefold higher than that registered in the 1970s. Since 1970 there has been a two-fold increase in the ratio of ectopic pregnancies to all reported pregnancies in Hungary and in 2012 7.4 ectopic pregnancies per thousand registered pregnancies were reported. Recently, the majority (80%) of cases can be diagnosed in early stage, and the related mortality objectively decreased in the past few decades to 3.8/10,000 ectopic pregnancies. If a woman with positive pregnancy test has abdominal pain and/or vaginal bleeding the physician should perform a work-up to safely exclude the possibility of ectopic pregnancy. The basis of diagnosis is ultrasonography, especially vaginal ultrasound examination and measurement of the β-subunit of human chorionic gonadotropin. The ultrasound diagnosis is based on the visualization of an ectopic mass rather than the inability to visualize an intrauterine pregnancy. In some questionable cases the diagnostic uterine curettage or laparoscopy may be useful. The actuality of this topic is justified by practical difficulties in obtaining correct diagnosis, especially in the early gestational time.

  8. Early history of scapular fractures.

    Science.gov (United States)

    Bartoníček, Jan; Kozánek, Michal; Jupiter, Jesse B

    2016-01-01

    The first to use the term Scapula was Vesalius (1514-1564) and thus it has remained ever since. Probably the oldest injured scapula, from 250 million years ago, was described by Chinese authors of a skeletal examination of a fossilised remains of a dinosaur Yangchuanosaurus hepingensis. In humans, the oldest known scapular fractures date back to the prehistoric and early historic times. In ancient times, a fracture of acromion was described in the treatises of Hippocrates. Early modern history of the treatment of scapular fractures is closely interlinked with the history of the French surgery. The first to point out the existence of these fractures were Petit, Du Verney and Desault in the 18th century. The first study devoted solely to scapular fractures was published by Traugott Karl August Vogt in 1799. Thomas Callaway published in 1849 an extensive dissertation on injuries to the shoulder girdle, in which he discussed a number of cases known at that time. The first radiograph of a scapular fracture was published by Petty in 1907. Mayo Robson (1884), Lambotte (1913) and Lane (1914) were pioneers in the surgical treatment of these fractures, followed in 1923 by the French surgeons Lenormat, Dujarrier and Basset. The first internal fixation of the glenoid fossa, including a radiograph, was published by Fischer in 1939.

  9. Recent Coverage of Early Childhood Education Approaches in Open Access Early Childhood Journals

    Science.gov (United States)

    Keskin, Burhanettin

    2016-01-01

    A content analysis of the coverage of the major approaches to early childhood education in the early childhood research journals, published between 2010 and 2014, that are early childhood research oriented and have free online access were investigated. Among 21 journals in early childhood education, two journals were selected for the content…

  10. Mission to Very Early Earth

    Energy Technology Data Exchange (ETDEWEB)

    Hutcheon, I D; Weber, P K; Fallon, S J; Smith, J B; Aleon, J; Ryerson, F J; Harrison, T M; Cavosie, A J; Valley, J W

    2007-03-13

    The Hadean Earth is often viewed as an inhospitable and, perhaps, unlikely setting for the rise of primordial life. However, carbonaceous materials supplied by accreting meteorites and sources of chemical energy similar to those fueling life around modern deep-sea volcanic vents would have been present in abundance. More questionable are two other essential ingredients for life - liquid water and clement temperatures. Did the Hadean Earth possess a hydrosphere and temperate climate compatible with the initiation of biologic activity? If so, the popular model of an excessively hot planetary surface characterized by a basaltic crust, devoid of continental material is invalid. Similarly, establishment of an Hadean hydrosphere prior to the cessation of heavy asteroid bombardment may mean that primitive life could have evolved and then been extinguished, only to rise again. The most effective means of determining the environmental conditions on this young planet is through geochemical analysis of samples retrieved from the Early Earth. While rocks older than 4 billion years (4 Ga) have not been found, individual zircon grains, the detritus of rocks long since eroded away, have been identified with ages as old as 4.4 Ga - only {approx}160 million years younger than the Earth itself. If we can use the geochemical information contained in these unique samples to infer the nature of their source rocks and the processes that formed them, we can place constraints on the conditions prevailing at the Earth's surface shortly after formation. This project utilizes a combined analytical and experimental approach to gather the necessary geochemical data to determine the parameters required to relate the zircons to their parent materials. Mission to Early Earth involves dating, isotopic and chemical analyses of mineral and melt inclusions within zircons and of the zircons themselves. The major experimental activity at LLNL focused on the partitioning of trace elements between

  11. Early sexual experience and prostitution.

    Science.gov (United States)

    James, J; Meyerding, J

    1977-12-01

    The authors compared several aspects of early sexual experience found in two earlier studies of prostitutes with results of research on "normal" women. The prostitutes had in common many negative experiences not found or found less often in other populations of young women. These include incestuous and/or coerced sex, lack parental guidance, intercouse at a young age, and few or no meaningful relationships with males. These women had discovered that sex could lead to a kind of status, even though that status is negatively labeled by the wider culture. In a society that values women on the basis of their sexuality, a woman who views herself as "debased" may see prostitution as a viable alternative--perhaps the only alternative.

  12. Myelopoiesis during Zebrafish Early Development

    Institute of Scientific and Technical Information of China (English)

    Jin Xu; Linsen Du; Zilong Wen

    2012-01-01

    Myelopoiesis is the process of producing all types of myeloid cells including monocytes/macrophages and granulocytes.Myeloid cells are known to manifest a wide spectrum of activities such as immune surveillance and tissue remodeling.Irregularities in myeloid cell development and their function are known to associate with the onset and the progression of a variety of human disorders such as leukemia.In the past decades,extensive studies have been carried out in various model organisms to elucidate the molecular mechanisms underlying myelopoiesis with the hope that these efforts will yield knowledge translatable into therapies for related diseases.Zebrafish has recently emerged as a prominent animal model for studying myelopoiesis,especially during early embryogenesis,largely owing to its unique properties such as transparent embryonic body and external development.This review introduces the methodologies used in zebrafish research and focuses on the recent research progresses of zebrafish myelopoiesis.

  13. LHCb Early Career Scientist Awards

    CERN Multimedia

    Patrick Koppenburg for the LHCb Collaboration

    2016-01-01

    On 15 September 2016, the LHCb collaboration awarded the first set of prizes for outstanding contributions of early career scientists.   From left to right: Guy Wilkinson (LHCb spokesperson), Sascha Stahl, Kevin Dungs, Tim Head, Roel Aaij, Conor Fitzpatrick, Claire Prouvé, Patrick Koppenburg (chair of committee) and Sean Benson. Twenty-five nominations were submitted and considered by the committee, and 5 prizes were awarded to teams or individuals for works that had a significant impact within the last year. The awardees are: Roel Aaij, Sean Benson, Conor Fitzpatrick, Rosen Matev and Sascha Stahl for having implemented and commissioned the revolutionary changes to the LHC Run-2 high-level-trigger, including the first widespread deployment of real-time analysis techniques in High Energy Physics;   Kevin Dungs and Tim Head for having launched the Starterkit initiative, a new style of software tutorials based on modern programming methods. “Starterkit is a group of ph...

  14. LEP vacuum chamber, early prototype

    CERN Multimedia

    1978-01-01

    The structure of LEP, with long bending magnets and little access to the vacuum chamber between them, required distributed pumping. This is an early prototype for the LEP vacuum chamber, made from extruded aluminium. The main opening is for the beam. The small channel to the right is for cooling water, to carry away the heat deposited by the synchroton radiation from the beam. The 4 slots in the channel to the left house the strip-shaped ion-getter pumps (see 7810255). The ion-getter pumps depended on the magnetic field of the bending magnets, too low at injection energy for the pumps to function well. Also, a different design was required outside the bending magnets. This design was therefore abandoned, in favour of a thermal getter pump (see 8301153 and 8305170).

  15. [Early outcomes of Asperger's syndrome].

    Science.gov (United States)

    Bobrov, A E; Somova, V M

    2013-01-01

    Mental state of adult patients, who since childhood had features of Asperger's syndrome (AS), was studied. We examined 107 patients (89 men and 18 women). At the moment of inclusion in the study, all the patients met criteria of ICD=10 for AS. This was confirmed by the examination of the patients with the help of ASDASQ and ASDI scales. Based on the results of psychopathological and psychological five variants of AS outcomes in the age of early adulthood were identified as follows: integrated, inhibitory, peculiar, border-line and hypernormative. At the moment of examination, psychosocial compensation was observed in 38% of patients, only 28% of patients were on treatment and 20% had a history of transitory psychotic episodes. The authors conclude that the results of the study suggest the relatively favorable prognosis of AS. The differential clinical evaluation of this group as well as implication of adequate psychosocial and psychotherapeutic methods in their treatment is needed.

  16. Early passive acquisition in Inuktitut.

    Science.gov (United States)

    Allen, S E; Crago, M B

    1996-02-01

    Passive structures are typically assumed to be one of the later acquired constructions in child language. English-speaking children have been shown to produce and comprehend their first simple passive structures productively by about age four and to master more complex structures by about age nine. Recent crosslinguistic data have shown that this pattern may not hold across languages of varying structures. This paper presents data from four Inuit children aged 2;0 to 3;6 that shows relatively early acquisition of both simple and complex forms of the passive. Within this age range children are productively producing truncated, full, action and experiential passives. Some possible reasons for this precociousness are explored including adult input and language structure.

  17. Early laparotomy after lung transplantation

    DEFF Research Database (Denmark)

    Bredahl, Pia; Zemtsovski, Mikhail; Perch, Michael;

    2014-01-01

    BACKGROUND: Gastrointestinal complications after lung transplantation have been reported with incidence rates ranging from 3% to 51%, but the reasons are poorly understood. We aimed to investigate the correlations between pulmonary diseases leading to lung transplantation and early gastrointestinal...... complications requiring laparotomy after transplantation with outcomes for patients at increased risk. METHODS: In this study we performed a retrospective analysis of data of patients who underwent lung transplantation at our institution from 2004 to 2012. The study period was limited to the first 90 days after...... for time on mechanical ventilation. Among pulmonary diseases and demographics of the patients, no other risk factors were identified for laparotomy. CONCLUSIONS: A1AD was the only significant risk factor identified for gastrointestinal complications that required laparotomy within 3 months after lung...

  18. Women, motherhood and early childhood

    DEFF Research Database (Denmark)

    Ravnbøl, Camilla Ida

    This paper explores the question of how Roma women’s situation influences Roma children’s survival, growth and development in the early years. It focuses specifically on the barriers and opportunities for action that Roma women experience and how these influence their possibilities to engage...... in efforts for their young children. The paper adopts the perspective that in poor and socially excluded Roma communities, young children’s survival, growth and development cannot be addressed effectively if the rights of women are overlooked. Roma women navigate in contexts where they, as women, experience...... multiple barriers to their agency in particular due to multiple forms of discrimination and living in poverty on the margins of society. In such contexts of disempowerment, programme responses are likely to meet with limited success if they seek to teach mothers about child care and rearing, without...

  19. How early and how long?

    Directory of Open Access Journals (Sweden)

    Mette Løvgren

    2012-01-01

    Full Text Available Abstract: Day care centres have become a normal part of Norwegian childhood, even among quite small children. In 1970 less than 3 per cent of Norwegian children of pre-school were enrolled. At the end of 2009 as much as 70 per cent of children aged 12 to 24 months were enrolled and for 90 per cent of them a full day stay had been arranged. Norwegian children with small children opt for an early start at a day care centre. However, the day care centre employees do not share the same views as the users of the services they provide. Only one third of them express the opinion that children may start at the age of one and have a full day stay at this age. The article discusses this discrepancy between the users and providers of public financed day care.

  20. Women, motherhood and early childhood

    DEFF Research Database (Denmark)

    Ravnbøl, Camilla Ida

    This paper explores the question of how Roma women’s situation influences Roma children’s survival, growth and development in the early years. It focuses specifically on the barriers and opportunities for action that Roma women experience and how these influence their possibilities to engage...... in efforts for their young children. The paper adopts the perspective that in poor and socially excluded Roma communities, young children’s survival, growth and development cannot be addressed effectively if the rights of women are overlooked. Roma women navigate in contexts where they, as women, experience...... an assessment of the mothers’ capacity to internalize and act upon advice. It is argued that supporting Roma women’s access to human rights is likely to have positive outcomes for the women and their families, especially the young children...

  1. Acute leukemia in early childhood

    Directory of Open Access Journals (Sweden)

    M. Emerenciano

    2007-06-01

    Full Text Available Acute leukemia in early childhood is biologically and clinically distinct. The particular characteristics of this malignancy diagnosed during the first months of life have provided remarkable insights into the etiology of the disease. The pro-B, CD10 negative immunophenotype is typically found in infant acute leukemia, and the most common genetic alterations are the rearrangements of the MLL gene. In addition, the TEL/AML1 fusion gene is most frequently found in children older than 24 months. A molecular study on a Brazilian cohort (age range 0-23 months has detected TEL/AML1+ve (N = 9, E2A/PBX1+ve (N = 4, PML/RARA+ve (N = 4, and AML1/ETO+ve (N = 2 cases. Undoubtedly, the great majority of genetic events occurring in these patients arise prenatally. The environmental exposure to damaging agents that give rise to genetic changes prenatally may be accurately determined in infants since the window of exposure is limited and known. Several studies have shown maternal exposures that may give rise to leukemogenic changes. The Brazilian Collaborative Study Group of Infant Acute Leukemia has found that mothers exposed to dipyrone, pesticides and hormones had an increased chance to give birth to babies with infant acute leukemia [OR = 1.48 (95%CI = 1.05-2.07, OR = 2.27 (95%CI = 1.56-3.31 and OR = 9.08 (95%CI = 2.95-27.96], respectively. This review aims to summarize recent clues that have facilitated the elucidation of the biology of early childhood leukemias, with emphasis on infant acute leukemia in the Brazilian population.

  2. New treatment of early fetal chylothorax

    DEFF Research Database (Denmark)

    Nygaard, Ulrikka; Sundberg, Karin; Nielsen, Henriette Svarre

    2007-01-01

    OBJECTIVE: To evaluate OK-432, a preparation of Streptococcus pyogenes, in the treatment of early fetal chylothorax. METHODS: A prospective study of all fetuses (n=7) with persistent early chylothorax (gestational ages 16-21 weeks) referred to the tertiary center of fetal medicine in Denmark in 2...... effusions, lung hypoplasia, or hydrops. CONCLUSION: Persistent early chylothorax is a condition with a high mortality rate and no established treatment option. Use of OK-432 is a promising therapy for selected fetuses with persistent chylothorax early in the second trimester....

  3. Noncommutativity in the early universe

    Science.gov (United States)

    Oliveira-Neto, G.; Silva de Oliveira, M.; Monerat, G. A.; Corrêa Silva, E. V.

    In the present work, we study the noncommutative version of a quantum cosmology model. The model has a Friedmann-Robertson-Walker (FRW) geometry, the matter content is a radiative perfect fluid and the spatial sections have zero constant curvature. In this model, the scale factor takes values in a bounded domain. Therefore, its quantum mechanical version has a discrete energy spectrum. We compute the discrete energy spectrum and the corresponding eigenfunctions. The energies depend on a noncommutative parameter β. We compute the scale factor expected value () for several values of β. For all of them, oscillates between maxima and minima values and never vanishes. It gives an initial indication that those models are free from singularities, at the quantum level. We improve this result by showing that if we subtract a quantity proportional to the standard deviation of a from , this quantity is still positive. The behavior, for the present model, is a drastic modification of the behavior in the corresponding commutative version of the present model. There, grows without limits with the time variable. Therefore, if the present model may represent the early stages of the universe, the results of the present paper give an indication that may have been, initially, bounded due to noncommutativity. We also compute the Bohmian trajectories for a, which are in accordance with , and the quantum potential Q. From Q, we may understand why that model is free from singularities, at the quantum level.

  4. Early vision and focal attention

    Science.gov (United States)

    Julesz, Bela

    1991-07-01

    At the thirty-year anniversary of the introduction of the technique of computer-generated random-dot stereograms and random-dot cinematograms into psychology, the impact of the technique on brain research and on the study of artificial intelligence is reviewed. The main finding-that stereoscopic depth perception (stereopsis), motion perception, and preattentive texture discrimination are basically bottom-up processes, which occur without the help of the top-down processes of cognition and semantic memory-greatly simplifies the study of these processes of early vision and permits the linking of human perception with monkey neurophysiology. Particularly interesting are the unexpected findings that stereopsis (assumed to be local) is a global process, while texture discrimination (assumed to be a global process, governed by statistics) is local, based on some conspicuous local features (textons). It is shown that the top-down process of "shape (depth) from shading" does not affect stereopsis, and some of the models of machine vision are evaluated. The asymmetry effect of human texture discrimination is discussed, together with recent nonlinear spatial filter models and a novel extension of the texton theory that can cope with the asymmetry problem. This didactic review attempts to introduce the physicist to the field of psychobiology and its problems-including metascientific problems of brain research, problems of scientific creativity, the state of artificial intelligence research (including connectionist neural networks) aimed at modeling brain activity, and the fundamental role of focal attention in mental events.

  5. Cosmology and the early universe

    Science.gov (United States)

    Joshi, Abhigna

    2017-01-01

    In the beginning the universe was in a hot dense state nearly 13.8 billion years ago. The thermal history of the universe was traced back to an era when the temperature was about 1012K. At this early time, the universe was filled with particles-mostly photons and leptons- whose interactions are hopefully weak enough to allow this medium to be treated as a more or less ideal gas. However, if we look back a little further, into the first 0.0001 second of cosmic history when the temperature was above 1012K. At such temperatures, there will be present in thermal equilibrium copious numbers of strongly interacting particles-mostly masons and baryons-with a mean interparticle distance less than a Compton wavelength. These particles will be in a state of continual mutual interaction, and cannot reasonably be expected to obey any simple equation of state. The inflationary epoch lasted from 10-36seconds after the Big Bang to sometime between 10-33and 10-32seconds. Matter and energy created in this time. Right after that space expanded exponentially with enormous rate of 74.3 +/-2.1Km per second per Mpc. Undergraduate student and researcher of the string theory, quantum gravity, cosmology and quantum biology.

  6. Early flavor experiences: research update.

    Science.gov (United States)

    Mennella, J A; Beauchamp, G K

    1998-07-01

    Anyone who has observed infants for any period of time can testify to the intense activity occurring in and around their mouths--the primary site for learning in the first few months of life. Before they are even able to crawl, infants have learned much about their new sensory world. Though recent research we have begun to explore the impact of these early experiences on infants' acceptance of solid foods and how they explore objects in their environment. We have also begun to focus on the sensory experiences of the formula-fed infant, in particular, how their responses to particular formulas, which are extremely unpalatable to older children and adults, change during infancy. This is a relatively new and exciting area of study, with much research yet to be done. It is clear, however, that infants are not passive receptacles for flavored foods. Parents who offer a variety of foods will provide both a nutritious, well-balanced diet, as well as an opportunity for their children's own personal preferences to develop.

  7. Early detection of hearing loss

    Directory of Open Access Journals (Sweden)

    Schade, Götz

    2008-01-01

    Full Text Available The universal newborn hearing screening (UNHS is currently spreading in Germany, as well, even though there can be no talk of a comprehensive establishment. The introduction of UNHS in several federal states such as Hamburg, Hessen, and Schleswig-Holstein can be ascribed to the personal commitment of individual pediatric audiologists. Apart from the procurement of the screening equipment and the training of the staff responsible for the examination of the newborns, the tracking, i.e. the follow-up on children with conspicuous test results, is of utmost importance. This involves significant administration effort and work and is subject to data protection laws that can differ substantially between the various federal states. Among audiologists, there is consensus that within the first three months of a child’s life, a hearing loss must be diagnosed and that between the age of 3 and 6 months, the supply of a hearing aid must have been initiated. For this purpose, screening steps 1 (usually a TEOAE measurement and 2 (AABR testing need to be conducted in the maternity hospital. The follow-up of step 1 then comprises the repetition of the TEOAE- and AABR measurement for conspicuous children by a specialized physician. The follow-up of step 2 comprises the confirmatory diagnostics in a pediatric audiological center. This always implies BERA diagnostics during spontaneous sleep or under sedation. The subsequent early supply of a hearing aid should generally be conducted by a (pediatric acoustician specialized on children.

  8. Theories of early language acquisition.

    Science.gov (United States)

    Plunkett, K

    1997-07-01

    What features of brain processing and neural development support linguistic development in young children? To what extent is the profile and timing of linguistic development in young children determined by a pre-ordained genetic programme? Does the environment play a crucial role in determining the patterns of change observed in children growing up? Recent experimental, neuroimaging and computational studies of developmental change in children promise to contribute to a deeper understanding of how the brain becomes wired up for language. In this review, the muttidisciplinary perspectives of cognitive neuroscience, experimental psycholinguistics and neural network modelling are brought to bear on four distinct areas in the study of language acquisition: early speech perception, word recognition, word learning and the acquisition of grammatical inflections. It is suggested that each area demonstrates how linguistic development can be driven by the interaction of general learning mechanisms, highly sensitive to particular statistical regularities in the input, with a richly structured environment which provides the necessary ingredients for the emergence of linguistic representations that support mature language processing. Similar epigenetic principles, guiding the emergence of linguistic structure, apply to all these domains, offering insights into phenomena ranging from the precocity of young infant's sensitivity to speech contrasts to the complexities of the problem facing the young child learning the arabic plural.

  9. VIRUS early installation and commissioning

    Science.gov (United States)

    Tuttle, Sarah E.; Hill, Gary J.; Vattiat, Brian L.; Lee, Hanshin; Drory, Niv; Kelz, Andreas; Ramsey, Jason; Peterson, Trent; Noyola, Eva; DePoy, Darren L.; Marshall, Jennifer L.; Chonis, Taylor S.; Dalton, Gavin; Fabricius, Maximilian; Farrow, Daniel; Good, John M.; Haynes, Dionne M.; Indahl, Briana; Jahn, Thomas; Kriel, Hermanus; Nicklas, Harald; Montesano, Francesco; Prochaska, Travis; Allen, Richard D.; Landriau, Martin; MacQueen, Phillip J.; Roth, Martin M.; Savage, Richard; Snigula, Jan M.

    2016-08-01

    VIRUS is a massively replicated spectrograph built for HETDEX, the Hobby Eberly Telescope Dark Energy Experiment. It consists of 156 channels within 78 units fed by 34944 fibers over the 22 arcminute field of the upgraded HET. VIRUS covers a relatively narrow bandpass (350-550nm) at low resolution (R 700) to target the emission of Lyman-alpha emitters (LAEs) for HETDEX. VIRUS is a first demonstration of industrial style assembly line replication in optical astronomy. Installation and testing of VIRUS units began in November of 2015. This winter we celebrated the first on sky instrument activity of the upgraded HET, using a VIRUS unit and LRS2-R (the upgraded facility Low Resolution Spectrograph for the HET). Here we describe progress in VIRUS installation and commissioning through June 2016. We include early sky data obtained to characterize spectrograph performance and on sky performance of the newly upgraded HET. As part of the instrumentation for first science light at the HET, the IFU fed spectrographs were used to test a full range of telescope system functionality including the field calibration unit (FCU).We also use placement of strategic IFUs to map the new HET field to the fiber placement, and demonstrate actuation of the dithering mechanism key to HETDEX observations.

  10. Casebooks in Early Modern England:

    Science.gov (United States)

    Kassell, Lauren

    2014-01-01

    summary Casebooks are the richest sources that we have for encounters between early modern medical practitioners and their patients. This article compares astrological and medical records across two centuries, focused on England, and charts developments in the ways in which practitioners kept records and reflected on their practices. Astrologers had a long history of working from particular moments, stellar configurations, and events to general rules. These practices required systematic notation. Physicians increasingly modeled themselves on Hippocrates, recording details of cases as the basis for reasoned expositions of the histories of disease. Medical records, as other scholars have demonstrated, shaped the production of medical knowledge. Instead, this article focuses on the nature of casebooks as artifacts of the medical encounter. It establishes that casebooks were serial records of practice, akin to diaries, testimonials, and registers; identifies extant English casebooks and the practices that led to their production and preservation; and concludes that the processes of writing, ordering, and preserving medical records are as important for understanding the medical encounter as the records themselves. PMID:25557513

  11. Early detection of materials degradation

    Science.gov (United States)

    Meyendorf, Norbert

    2017-02-01

    Lightweight components for transportation and aerospace applications are designed for an estimated lifecycle, taking expected mechanical and environmental loads into account. The main reason for catastrophic failure of components within the expected lifecycle are material inhomogeneities, like pores and inclusions as origin for fatigue cracks, that have not been detected by NDE. However, material degradation by designed or unexpected loading conditions or environmental impacts can accelerate the crack initiation or growth. Conventional NDE methods are usually able to detect cracks that are formed at the end of the degradation process, but methods for early detection of fatigue, creep, and corrosion are still a matter of research. For conventional materials ultrasonic, electromagnetic, or thermographic methods have been demonstrated as promising. Other approaches are focused to surface damage by using optical methods or characterization of the residual surface stresses that can significantly affect the creation of fatigue cracks. For conventional metallic materials, material models for nucleation and propagation of damage have been successfully applied for several years. Material microstructure/property relations are well established and the effect of loading conditions on the component life can be simulated. For advanced materials, for example carbon matrix composites or ceramic matrix composites, the processes of nucleation and propagation of damage is still not fully understood. For these materials NDE methods can not only be used for the periodic inspections, but can significantly contribute to the material scientific knowledge to understand and model the behavior of composite materials.

  12. Early to Bed, Early to Rise a Back-To-School Challenge

    Science.gov (United States)

    ... medlineplus.gov/news/fullstory_160532.html Early to Bed, Early to Rise a Back-to-School Challenge ... idea. Allow your kids some quiet time before bed to unwind. "That can include relaxing activities, such ...

  13. Seeing Touches Early in Life

    Science.gov (United States)

    Addabbo, Margaret; Longhi, Elena; Bolognini, Nadia; Senna, Irene; Tagliabue, Paolo; Macchi Cassia, Viola; Turati, Chiara

    2015-01-01

    The sense of touch provides fundamental information about the surrounding world, and feedback about our own actions. Although touch is very important during the earliest stages of life, to date no study has investigated infants’ abilities to process visual stimuli implying touch. This study explores the developmental origins of the ability to visually recognize touching gestures involving others. Looking times and orienting responses were measured in a visual preference task, in which participants were simultaneously presented with two videos depicting a touching and a no-touching gesture involving human body parts (face, hand) and/or an object (spoon). In Experiment 1, 2-day-old newborns and 3-month-old infants viewed two videos: in one video a moving hand touched a static face, in the other the moving hand stopped before touching it. Results showed that only 3-month-olds, but not newborns, differentiated the touching from the no-touching gesture, displaying a preference for the former over the latter. To test whether newborns could manifest a preferential visual response when the touched body part is different from the face, in Experiment 2 newborns were presented with touching/no-touching gestures in which a hand or an inanimate object—i.e., a spoon- moved towards a static hand. Newborns were able to discriminate a hand-to-hand touching gesture, but they did not manifest any preference for the object-to-hand touch. The present findings speak in favour of an early ability to visually recognize touching gestures involving the interaction between human body parts. PMID:26366563

  14. Seeing Touches Early in Life.

    Directory of Open Access Journals (Sweden)

    Margaret Addabbo

    Full Text Available The sense of touch provides fundamental information about the surrounding world, and feedback about our own actions. Although touch is very important during the earliest stages of life, to date no study has investigated infants' abilities to process visual stimuli implying touch. This study explores the developmental origins of the ability to visually recognize touching gestures involving others. Looking times and orienting responses were measured in a visual preference task, in which participants were simultaneously presented with two videos depicting a touching and a no-touching gesture involving human body parts (face, hand and/or an object (spoon. In Experiment 1, 2-day-old newborns and 3-month-old infants viewed two videos: in one video a moving hand touched a static face, in the other the moving hand stopped before touching it. Results showed that only 3-month-olds, but not newborns, differentiated the touching from the no-touching gesture, displaying a preference for the former over the latter. To test whether newborns could manifest a preferential visual response when the touched body part is different from the face, in Experiment 2 newborns were presented with touching/no-touching gestures in which a hand or an inanimate object-i.e., a spoon- moved towards a static hand. Newborns were able to discriminate a hand-to-hand touching gesture, but they did not manifest any preference for the object-to-hand touch. The present findings speak in favour of an early ability to visually recognize touching gestures involving the interaction between human body parts.

  15. Is early intervention worth it?

    Science.gov (United States)

    Yelin, Edward

    2005-01-01

    Historically, the largest components of costs associated with rheumatoid arthritis (RA), the most common inflammatory rheumatic disease, were hospitalizations, principally for joint replacement surgery, and work loss. Thus, for expensive interventions such as biological agents to be "worthwhile," they must reduce the prevalence of joint replacement and assist persons with RA in maintaining employment. However, joint replacement surgery and work losses tend to occur at least several years after onset of disease, even in severe cases. Assessing the cost-effectiveness of expenditures becomes computationally and politically difficult when the expenditure and the outcome are separated in time. The computational issue concerns the translation of future benefits--surgeries avoided and jobs held onto years from now--into present monetary values. The computational issue may be even more complex when the benefits are less tangible than surgery and wages; for example, when measured by quality-adjusted life-years. The political issue concerns the disjuncture between the agents making the expenditures--provincial health insurance in Canada or an employer's health plan in the US--and the agents reaping the benefits, a private disability insurance company or provincial or state workers' compensation fund. In addition, there is an ethical dilemma. In the US, many of the advances in the care for RA such as the biological agents derive, at least in part, from federal research expenditures. Such expenditures are financed by increasingly regressive taxes. Yet the individuals bearing an increasing share of the tax burden find themselves relegated to more restrictive health insurance plans less likely to provide access to those agents. Thus, whether expenditures for early interventions are worthwhile may turn on such issues as how long the expenditure and the benefits are separated in time, how well the interests of the agent making the expenditure and the agent reaping the rewards are

  16. WMAP Detection of Early Reionization

    Science.gov (United States)

    Kogut, A.

    2003-01-01

    The Wilkinson Microwave Anisotropy Probe (WMAP) has mapped the full sky in Stokes I, Q, and U parameters at frequencies 23, 33, 41, 61, and 94 GHz. We detect correlations between the temperature and polarization maps significant at more than 10 standard deviations. The correlations are inconsistent with instrument noise and are significantly larger than the upper limits established for potential systematic errors. The correlations are present in all WMAP frequency bands with similar amplitude from 23 to 94 GHz, and are consistent with a superposition of a CMB signal with a weak foreground. The fitted CMB component is robust against different data combinations and fitting techniques. On small angular scales the WMAP data show the temperature-polarization correlation expected from adiabatic density perturbations. The data for $\\ell > 20$ agree well with the signal predicted solely from the temperature power spectra, with no additional free parameters. The existence of correlations on super-horizon scales provides significant support for inflationary cosmologies. We detect excess power on large angular scales compared to predictions based on the temperature power spectra alone. The excess power is well described by reionization at redshift $11 reionization optical depth yields results consistent with the best-fit $\\Lambda$CDM model, with best fit value $\\tau = 0.17 \\pm 0.04$ at 68\\% confidence, including systematic and foreground uncertainties. This trough in the absorption spectra of distant quasars, and implies that the universe has a complex ionization history. I will discuss the WMAP data and its implications for reionization in the early universe.

  17. The Early History of Life

    Science.gov (United States)

    Nisbet, E. G.; Fowler, C. M. R.

    2003-12-01

    The youth of the Earth is strange to us. Many of the most fundamental constraints on life may have been different, especially the oxidation state of the surface. Should we suddenly land on its Hadean or early Archean surface by some sci-fi accident, we would not recognize our home. Above, the sky may have been green or some other unworldly color, and above that the weak young Sun might have been unrecognizable to someone trying to identify it from its spectrum. Below, seismology would show a hot, comparatively low-viscosity interior, possibly with a magma ocean in the deeper part of the upper mantle (Drake and Righter, 2002; Nisbet and Walker, 1982), and a core that, though present, was perhaps rather smaller than today. The continents may have been small islands in an icy sea, mostly frozen with some leads of open water, ( Sleep et al., 2001). Into these icy oceans, huge protruding Hawaii-like volcanoes would have poured out vast far-spreading floods of komatiite lavas in immense eruptions that may have created sudden local hypercane storms to disrupt the nearby icebergs. And meteorites would rain down.Or perhaps it was not so strange, nor so violent. The child is father to the man; young Earth was mother to Old Earth. Earth had hydrogen, silicate rock below and on the surface abundant carbon, which her ancient self retains today. Moreover, Earth was oxygen-rich, as today. Today, a tiny part of the oxygen is free, as air; then the oxygen would have been in the mantle while the surface oxygen was used to handcuff the hydrogen as dihydrogen monoxide. Oxygen dihydride is dense, unlikely to fly off to space, and at the poles, rock-forming. Of all the geochemical features that make Earth unique, the initial degassing (Genesis 2 : b) and then the sustained presence of liquid water is the defining oddity of this planet. Early Earth probably also kept much of its carbon, nitrogen, and sulfur as oxide or hydride. And, after the most cataclysmic events had passed, ˜4.5 Ga

  18. Early life factors and adult mammographic density

    NARCIS (Netherlands)

    Lokate, M.; Duijnhoven, van F.J.B.; Berg, van den S.W.; Peeters, P.H.; Gils, van C.H.

    2013-01-01

    Purpose Early life factors have shown to be related to breast cancer risk. The pathophysiological link could be mammographic density, a strong risk factor for breast cancer. Mammary gland development already starts in utero and early life factors might affect the number of mammary cells at risk. In

  19. Dislocation generation during early stage sintering.

    Science.gov (United States)

    Sheehan, J. E.; Lenel, F. V.; Ansell, G. S.

    1973-01-01

    Discussion of the effects of capillarity-induced stresses on dislocations during early stage sintering. A special version of Hirth's (1963) theoretical calculation procedures modified to describe dislocation nucleation on planes meeting the sintering body's neck surface obliquely is shown to predict plastic flow at stress levels know to exist between micron size metal particles in the early stages of sintering.

  20. Striving for Quality in Early Childhood Inclusion

    Science.gov (United States)

    Brancato, Kimberly

    2013-01-01

    An essential component of best practice in the field of early childhood special education is the inclusion of children with disabilities in typical early childhood settings. As the practice of inclusion has increased in recent years it has become imperative to ensure that children with disabilities attend quality programs. The main purpose of this…

  1. Early Retirement Incentive Programs for Teachers.

    Science.gov (United States)

    Tarter, Scott E.; McCarthy, Martha M.

    1989-01-01

    Despite their popularity, early retirement incentive programs (ERIPs) remain controversial. Although early retirement may be appealing to some teachers, others bristle at being shoved into retirement. Following a historical overview, this article summarizes recent state legislation and addresses ERIP legal status under the Age Discrimination in…

  2. Predictors of Early Retirement Among University Faculty.

    Science.gov (United States)

    Monahan, Deborah J.; Greene, Vernon L.

    1987-01-01

    Interviews with faculty at a university having an incentive early retirement plan revealed that those choosing to retire early were in poorer health, faced smaller proportional income decrement upon retirement, were less satisfied with teaching assignments, and considered themselves lower in research productivity and higher in teaching and…

  3. Mid-Career Change and Early Retirement.

    Science.gov (United States)

    Patton, Carl V.

    1978-01-01

    An NSF study suggests that important qualitative changes in the faculty may be obtained through increased attention to mid-career change and early retirement programs. Interest in career options, early retirement alternatives, evaluation criteria, mid-career change alternatives, internship, fellowship programs, and retraining programs are…

  4. Preschool Teachers' Constructions of Early Reading

    Science.gov (United States)

    Walker, Karen E.

    2015-01-01

    Research concerning preschool teachers' constructions of early reading has potential to influence teachers' curricular decisions and classroom practice. Six preschool teachers in North Texas were interviewed in regard to what they think about early reading and how they develop these understandings or constructions. The systematic, inductive…

  5. Early Fives Program Evaluation: Farmington Public Schools.

    Science.gov (United States)

    Peper, H. Robert

    An evaluation of the Early Fives program of the Farmington (Michigan) Public Schools is reported. This extra-year program began in the 1980-81 school year. By the 1982-83 school year, tuition was no longer charged, and a systematic screening effort was implemented. Each Early Fives classroom contains a maximum of 15 children with a certified…

  6. Fatigue in early Parkinson’s disease

    Institute of Scientific and Technical Information of China (English)

    秦朝晖

    2012-01-01

    Objective To investigate the prevalence,character-istics and risk factors of fatigue in a large cohort of subjects with early Parkinson’s disease (PD).Methods A total of 391 individuals with PD,recrutied in Linzhi trial, were re-screened. Early, non-depressed subjects

  7. Early Stuttering, Temperament and Anxiety: Two Hypotheses

    Science.gov (United States)

    Kefalianos, Elaina; Onslow, Mark; Block, Susan; Menzies, Ross; Reilly, Sheena

    2012-01-01

    Purpose: The topic of temperament and early stuttering and the extent to which it involves anxiety is theoretically and clinically relevant. The topic can contribute to theory development and clinical practices with early stuttering. Method: We present a review of the empirical literature for this area with a view to determining which of two…

  8. Good practices in early childhood education:

    DEFF Research Database (Denmark)

    Sanders, Lise; Gregoriadis, Athanasis; Zachopoulou, Evridiki;

    Good practices in early childhood education er en undersøgelse fortaget efter Early Childhood Environmental Rating Scale - R (ECERS-R). I undersøgelsen deltog Akademikere, pædagoger og kommunalt personale fra de 6 partnerlande bestående af Grækenland, Portugal, Finland, Danmark, Rumænien og Cyper...

  9. Moving beyond Colorblindness in Early Childhood Classrooms

    Science.gov (United States)

    Boutte, Gloria Swindler; Lopez-Robertson, Julia; Powers-Costello, Elizabeth

    2011-01-01

    Countering the position that colorblindness is desirable for teachers and children, this article encourages early childhood education teachers to engage in conversations about race and racism with young children. We discuss why the early childhood years are important for interrupting racism and make suggestions for helping children develop tools…

  10. Early detection of COPD in general practice

    DEFF Research Database (Denmark)

    Ulrik, Charlotte Suppli; Løkke, Anders; Dahl, Ronald

    2011-01-01

    Early detection enables the possibility for interventions to reduce the future burden of COPD. The Danish National Board of Health recommends that individuals >35 years with tobacco/occupational exposure, and at least 1 respiratory symptom should be offered a spirometry to facilitate early detect...

  11. Early Sport Specialization: A Psychological Perspective

    Science.gov (United States)

    Gould, Daniel

    2010-01-01

    Specializing too early in life can lead to emotional stress, loss of motivation, and burnout, but the research is inadequate to resolve the question of whether early specialization or diversification is more beneficial from a psychological perspective. Nevertheless, some best practices are recommended based on the known benefits and detriments.…

  12. Quality Measurement in Early Childhood Settings

    Science.gov (United States)

    Zaslow, Martha, Ed.; Martinez-Beck, Ivelisse, Ed.; Tout, Kathryn, Ed.; Halle, Tamara, Ed.

    2011-01-01

    What constitutes quality in early childhood settings, and how can it best be measured with today's widely used tools and promising new approaches? Find authoritative answers in this book, a must-have for high-level administrators and policymakers as more and more states adopt early childhood Quality Rating and Improvement Systems. The most…

  13. The transcriptome landscape of early maize meiosis

    Science.gov (United States)

    Meiosis, particularly meiotic recombination, is a major factor affecting yield and breeding of plants. To gain insight into the transcriptome landscape during early initiation steps of meiotic recombination, we profiled early prophase I meiocytes from maize using RNA-seq. Our analyses of genes prefe...

  14. Early Years Students' Relationships with Mathematics

    Science.gov (United States)

    Takeuchi, Miwa Aoki; Towers, Jo; Plosz, Jennifer

    2016-01-01

    Early years mathematics experiences have been shown to be a significant predictor for students' school readiness and future mathematics achievement. Previous research also indicates an important connection between emotion and mathematics learning. How do students in early years education in Alberta describe their emotional relationship with…

  15. The Public Health Burden of Early Adversity

    Science.gov (United States)

    Schlueter, Lisa J.; Watamura, Sarah Enos

    2017-01-01

    Severe and chronic stress in early childhood has enormous physical and mental health costs across an individual's lifespan. Unfortunately, exposure to early life adversity is common, and costs accrue to individuals and society. This article highlights several promising approaches to buffer children from the negative health consequences associated…

  16. 23 CFR 710.501 - Early acquisition.

    Science.gov (United States)

    2010-04-01

    ... 23 Highways 1 2010-04-01 2010-04-01 false Early acquisition. 710.501 Section 710.501 Highways... REAL ESTATE Property Acquisition Alternatives § 710.501 Early acquisition. (a) Real property acquisition. The State may initiate acquisition of real property at any time it has the legal authority to...

  17. Linking Families and Early Childhood Education.

    Science.gov (United States)

    Hildebrand, Verna

    1985-01-01

    Discusses and uses a global human ecological system framework to analyze family needs in relation to early childhood education. Topics emphasized include family support systems, population trends, health care, employment patterns, and political systems. Suggestions for meeting these needs are addressed to early childhood educators. (DST)

  18. Formative Assessment: Guidance for Early Childhood Policymakers

    Science.gov (United States)

    Riley-Ayers, Shannon

    2014-01-01

    This policy report provides a guide and framework to early childhood policymakers considering formative assessment. The report defines formative assessment and outlines its process and application in the context of early childhood. The substance of this document is the issues for consideration in the implementation of the formative assessment…

  19. Music and the Baby's Brain: Early Experiences.

    Science.gov (United States)

    Fox, Donna Brink

    2000-01-01

    States that brain research may be too immature to use it as the only rationale for early music education. Proposes integrated instruction for music education and addresses the need for teacher preparation in early childhood music education. Discusses future collaborations providing three examples of models of childhood music collaborations and…

  20. Isocurvature fluctuations induce early star formation

    NARCIS (Netherlands)

    Sugiyama, N; Zaroubi, S; Silk, J

    2004-01-01

    The early reionization of the Universe inferred from the WMAP polarization results, if confirmed, poses a problem for the hypothesis that scale-invariant adiabatic density fluctuations account for large-scale structure and galaxy formation. One can only generate the required amount of early star for

  1. The EHDI and Early Intervention Connection

    Science.gov (United States)

    Nelson, Lauri; Bradham, Tamala S.; Houston, K. Todd

    2011-01-01

    State coordinators of early hearing detection and intervention (EHDI) programs completed a strengths, weaknesses, opportunities, and threats, or SWOT, analysis that examined 12 areas within state EHDI programs. For the early intervention focus question, 48 coordinators listed 273 items, and themes were identified within each SWOT category. A…

  2. Children's Early Numeracy in Finland and Iran

    Science.gov (United States)

    Aunio, Pirjo; Korhonen, Johan; Bashash, Laaya; Khoshbakht, Fariba

    2014-01-01

    This research investigates similarities and differences in young children's early numeracy skills related to age, nationality and gender. The participants were five- to seven-year-old children from Finland and Iran. Early numeracy was investigated by using tasks measuring number-related relational skills (e.g. comparison, one-to-one…

  3. Reforming Ontario Early Learning: A Review

    Science.gov (United States)

    Ryan, Thomas; Date, Gavin

    2014-01-01

    Herein, we address the reformation of Ontario early learning. Over the next 3 years, all 4- and 5-year-olds in Ontario (Canada) will be able to attend full-day early learning with child care, before and after school provided by the Government of Ontario Ministry of Education. The benefits of such a change are both academic and societal and are…

  4. Early and Late Rate of Force Development

    DEFF Research Database (Denmark)

    Andersen, Lars L; Andersen, Jesper L; Zebis, Mette K

    2010-01-01

    males participated in a 14-week resistance training intervention for the lower body and 10 matched subjects participated as controls. Maximal muscle strength (MVC) and RFD were measured during maximal voluntary isometric contraction of the quadriceps femoris muscle. Muscle biopsies were obtained from...... the vastus lateralis. The main findings were that RFD in the late phase of rising muscle force increased in response to resistance training whereas early RFD remained unchanged and early relative RFD (i.e., RFD/MVC) decreased. Quantitatively, muscle fiber cross-sectional area and MVC increased whereas......, qualitatively, the relative proportion of type IIX muscle fibers decreased. Multiple regression analysis showed that while increased MVC positively influenced both early and late RFD, decreased-type IIX negatively influenced early RFD only. In conclusion, early and late RFD responded differently to high...

  5. Early adversity, neural development, and inflammation.

    Science.gov (United States)

    Chiang, Jessica J; Taylor, Shelley E; Bower, Julienne E

    2015-12-01

    Early adversity is a risk factor for poor mental and physical health. Although altered neural development is believed to be one pathway linking early adversity to psychopathology, it has rarely been considered a pathway linking early adversity to poor physical health. However, this is a viable pathway because the central nervous system is known to interact with the immune system via the hypothalamic-pituitary-adrenal (HPA) axis and autonomic nervous system (ANS). In support of this pathway, early adversity has been linked to changes in neural development (particularly of the amygdala, hippocampus, and prefrontal cortex), HPA axis and ANS dysregulation, and higher levels of inflammation. Inflammation, in turn, can be detrimental to physical health when prolonged. In this review, we present these studies and consider how altered neural development may be a pathway by which early adversity increases inflammation and thus risk for adverse physical health outcomes.

  6. Sophisticated digestive systems in early arthropods.

    Science.gov (United States)

    Vannier, Jean; Liu, Jianni; Lerosey-Aubril, Rudy; Vinther, Jakob; Daley, Allison C

    2014-05-02

    Understanding the way in which animals diversified and radiated during their early evolutionary history remains one of the most captivating of scientific challenges. Integral to this is the 'Cambrian explosion', which records the rapid emergence of most animal phyla, and for which the triggering and accelerating factors, whether environmental or biological, are still unclear. Here we describe exceptionally well-preserved complex digestive organs in early arthropods from the early Cambrian of China and Greenland with functional similarities to certain modern crustaceans and trace these structures through the early evolutionary lineage of fossil arthropods. These digestive structures are assumed to have allowed for more efficient digestion and metabolism, promoting carnivory and macrophagy in early arthropods via predation or scavenging. This key innovation may have been of critical importance in the radiation and ecological success of Arthropoda, which has been the most diverse and abundant invertebrate phylum since the Cambrian.

  7. Bolatu's pharmacy theriac in early modern China.

    Science.gov (United States)

    Nappi, Carla

    2009-01-01

    In early modem China, natural history and medicine were shifting along with the boundaries of the empire. Naturalists struggled to cope with a pharmacy's worth of new and unfamiliar substances, texts, and terms, as plants, animals, and the drugs made from them travelled into China across land and sea. One crucial aspect of this phenomenon was the early modern exchange between Islamic and Chinese medicine. The history of theriac illustrates the importance of the recipe for the naturalization of foreign objects in early modem Chinese medicine. Theriac was a widely sought-after and hotly debated product in early modern European pharmacology and arrived into the Chinese medical canon via Arabic and Persian texts. The dialogue between language and material objects was critical to the Silk Road drug trade, and transliteration was ultimately a crucial technology used to translate drugs and texts about them in the early modern world.

  8. Early Retirement. A New Issue in Higher Education: The Financial Consequences of Early Retirement.

    Science.gov (United States)

    Jenny, Hans H.; Acton, Mary Ann

    This essay attempts to do the following: first, offer a definition of early retirement in order to establish boundaries for the discussion. Second, sketch some of the background and reasons why early retirement may be desirable; also it suggests why early retirement might not always be a constructive practice. Then the essay turns to the main…

  9. The Association between Early Conduct Problems and Early Marijuana Use in College Students

    Science.gov (United States)

    Falls, Benjamin J.; Wish, Eric D.; Garnier, Laura M.; Caldeira, Kimberly M.; O'Grady, Kevin E.; Vincent, Kathryn B.; Arria, Amelia M.

    2011-01-01

    Early conduct problems have been linked to early marijuana use in adolescence. The present study examines this association in a sample of 1,076 college students that was divided into three groups: (1) early marijuana users (began marijuana use prior to age 15; N = 126), (2) late marijuana users (began marijuana use at or after age 15; N = 607),…

  10. Early diastolic filling dynamics in diastolic dysfunction

    Directory of Open Access Journals (Sweden)

    Crean Peter A

    2003-07-01

    Full Text Available Abstract Background The aim of the study was to determine the relationship between the rate of peak early mitral inflow velocity and the peak early diastolic mitral annular tissue velocities in normal controls and to compare them with subjects with diastolic dysfunction. Methods The relationship between early passive diastolic transmitral flow and peak early mitral annular velocity in the normal and in diastolic dysfunction was studied. Two groups comprising 22 normal controls and 25 patients with diastolic dysfunction were studied. Results Compared with the normal group, those with diastolic dysfunction had a lower E/A ratio (0.7 ± 0.2 vs. 1.9 ± 0.5, p 2 vs. 871 ± 128.1 cm/sec2, p Conclusions This investigation provides information on the acceleration of early diastolic filling and its relationship to mitral annular peak tissue velocity (Ea recorded by Doppler tissue imaging. It supports not only the premise that recoil is an important mechanism for rapid early diastolic filling but also the existence of an early diastolic mechanism in normal.

  11. Ethics dilemmas of early detection of obesity

    DEFF Research Database (Denmark)

    Vallgårda, Signild

    2016-01-01

    Aim: To discuss the ethics dilemmas of the early detection of overweight and obesity. Methods: Analysis of the ethical aspects of early detection. Results: The early detection of overweight and obesity entails a number of ethical dilemmas because it may both be helpful and harmful. It may help...... people to lead a healthier life and non-detection could be considered neglectful. It may, however, cause anxiety, interfere with people’s integrity, focus only on individual causes and responsibilities, cause stigmatization and have adverse effects by inducing weight gain. Conclusions: Documentation...

  12. Early detection of ecosystem regime shifts

    DEFF Research Database (Denmark)

    Lindegren, Martin; Dakos, Vasilis; Groeger, Joachim P.;

    2012-01-01

    methods may have limited utility in ecosystem-based management as they show no or weak potential for early-warning. We therefore propose a multiple method approach for early detection of ecosystem regime shifts in monitoring data that may be useful in informing timely management actions in the face......Critical transitions between alternative stable states have been shown to occur across an array of complex systems. While our ability to identify abrupt regime shifts in natural ecosystems has improved, detection of potential early-warning signals previous to such shifts is still very limited...

  13. [Early detection and treatment of strabismus].

    Science.gov (United States)

    Mojon, Daniel

    2016-01-01

    An early diagnosis of strabismus is important in order to rule out treatable organic causes and in children, if indicated, to start as early as possible with an amblyopia treatment. Early detection will also decrease the risk for accidents secondary to diplopia, to the loss of binocular vision and to the restriction of the binocular visual field in case of esodeviations. The following therapeutic options exist: in some cases the prescription of the correct refraction will be sufficient, for small deviations a prismatic correction may allow a longstanding treatment, for larger or incomitant deviations strabismus surgery will be necessary, which nowadays can be performed using minimal-invasive technique on an outpatient base.

  14. Diastolic and autonomic dysfunction in early cirrhosis

    DEFF Research Database (Denmark)

    Dahl, Emilie Kristine; Møller, Søren; Kjær, Andreas

    2014-01-01

    cirrhosis during maximal β-adrenergic drive. MATERIAL AND METHODS. Nineteen patients with Child A (n = 12) and Child B cirrhosis (n = 7) and seven matched controls were studied during cardiac stress induced by increasing dosages of dobutamine and atropine. RESULTS. Pharmacological responsiveness was similar...... indicate that patients with early stage cirrhosis exhibit early diastolic and autonomic dysfunction as well as elevated pro-ANP. However, the cardiac chronotropic and inotropic responses to dobutamine stress were normal. The dynamics of ventricular repolarization appears normal in patients with early stage...

  15. Preclinical lung disease in early rheumatoid arthritis.

    Science.gov (United States)

    Robles-Perez, Alejandro; Luburich, Patricio; Rodriguez-Sanchon, Benigno; Dorca, Jordi; Nolla, Joan Miquel; Molina-Molina, Maria; Narvaez-Garcia, Javier

    2016-02-01

    Early detection and treatment of lung disease in patients with rheumatoid arthritis (RA) may ameliorate disease progression. The objectives of this study were to investigate the frequency of asymptomatic lung abnormalities in early RA patients and the potential association of positive RA blood reactive biomolecules with lung involvement. A prospective observational study was performed in a cohort of patients with early RA (joint symptoms disease with a baseline chest radiograph (CR) and complete pulmonary function tests (PFTs). In those patients with lung abnormalities on the CR or PFTs, a high-resolution chest computed tomography scan (HRCT) was performed. We included 40 patients (30 women). Altered PFTs were detected in 18 (45%) of these patients. These cases had a diffusion lung transfer capacity of carbon monoxide (DLCO) of disease is present in up to 45% of early RA patients and can be determined by PFTs and ACPA levels.

  16. Fecal Transplant Shows Early Promise Against Autism

    Science.gov (United States)

    ... 163263.html Fecal Transplant Shows Early Promise Against Autism Small study found giving healthy gut bacteria to ... study suggests a novel treatment for kids with autism: Give these young patients a fresh supply of ...

  17. Survey and Analysis of Early Retirement Policies

    Science.gov (United States)

    Taylor, Alton L.; Coolidge, Herbert E.

    1974-01-01

    Presents data from a study of member institutions of the Association of American Universities to determine the extent to which early retirement is being used in the nation's higher education institutions. (Editor/PG)

  18. An Argument for Early Retirement Incentive Planning.

    Science.gov (United States)

    Baenen, Leonard B.; Ernest, Robert C.

    1982-01-01

    Early retirement incentive programs are discussed as a humanitarian way of reducing payroll costs and rewarding long-tenured employees. The incentives to be considered, program communication, and problems found in incentive programs are addressed. (Author/MLF)

  19. Early Retirement: A Need for Reassessment.

    Science.gov (United States)

    Morrell, Louis

    1987-01-01

    Institutions must provide good counseling regarding retirement program benefits, since when in doubt about their financial position faculty members are inclined to remain employed. Colleges should consider offering nonfinancial incentives for early retirement as well as financial. (MLW)

  20. DNA Methylation, Behavior and Early Life Adversity

    Institute of Scientific and Technical Information of China (English)

    Moshe Szyf

    2013-01-01

    The impact of early physical and social environments on life-long phenotypes is well known.Moreover,we have documented evidence for gene-enviromnent interactions where identical gene variants are associated with different phenotypes that are dependent on early life adversity.What are the mechanisms that embed these early life experiences in the genome? DNA methylation is an enzymaticallycatalyzed modification of DNA that serves as a mechanism by which similar sequences acquire cell type identity during cellular differentiation and embryogenesis in the same individual.The hypothesis that will be discussed here proposes that the same mechanism confers environmental-exposure specific identity upon DNA providing a mechanism for embedding environmental experiences in the genome,thus affecting long-term phenotypes.Particularly important is the environment early in life including both the prenatal and postnatal social environments.

  1. Kidney Disease: Early Detection and Treatment

    Science.gov (United States)

    ... Bar Home Current Issue Past Issues Special Section Kidney Disease: Early Detection and Treatment Past Issues / Winter ... called a "urine albumin-to-creatinine ratio." Treating Kidney Disease Kidney disease is usually a progressive disease, ...

  2. Early and Periodic Screening, Diagnosis and Treatment

    Data.gov (United States)

    U.S. Department of Health & Human Services — The Early and Periodic Screening, Diagnostic and Treatment (EPSDT) benefit provides comprehensive and preventive health care services for children under age 21 who...

  3. Current early diagnostic biomarkers of prostate cancer

    Directory of Open Access Journals (Sweden)

    Min Qu

    2014-08-01

    Full Text Available Prostate cancer (PCa has become to have the highest incidence and the second mortality rate in western countries, affecting men's health to a large extent. Although prostate-specific antigen (PSA was discovered to help diagnose the cancer in an early stage for decades, its specificity is relative low, resulting in unnecessary biopsy for healthy people and over-treatment for patients. Thus, it is imperative to identify more and more effective biomarkers for early diagnosis of PCa in order to distinguish patients from healthy populations, which helps guide an early treatment to lower disease-related mortality by noninvasive or minimal invasive approaches. This review generally describes the current early diagnostic biomarkers of PCa in addition to PSA and summarizes the advantages and disadvantages of these biomarkers.

  4. EARLY CHILDHOOD CARE & EDUCATION: AN ICT PERSPECTIVE

    Directory of Open Access Journals (Sweden)

    Pradeep Kumar Mishra

    2012-03-01

    Full Text Available In the 21st century, technology serves to reinforce the educational bedrock of any country. Technology has revolutionized the teaching learning process by integrating different source of knowledge - clearly visible from primary to post-tertiary level. This paper examines the introduction of ICT in early childhood years centred on the relationship of ICT with the cognitive, emotional and social development of children. The paper discusses various aspects of the ongoing debate around ICT usage in the early years and tries to answer some of the relevant issues namely, the rationale for early introduction of ICT, the perceived risks and benefits involved in its usage, the role of the parents, and fostering appropriate application of ICT in the early childhood classrooms.

  5. Brain mechanisms in early language acquisition.

    Science.gov (United States)

    Kuhl, Patricia K

    2010-09-09

    The last decade has produced an explosion in neuroscience research examining young children's early processing of language. Noninvasive, safe functional brain measurements have now been proven feasible for use with children starting at birth. The phonetic level of language is especially accessible to experimental studies that document the innate state and the effect of learning on the brain. The neural signatures of learning at the phonetic level can be documented at a remarkably early point in development. Continuity in linguistic development from infants' earliest brain responses to phonetic stimuli is reflected in their language and prereading abilities in the second, third, and fifth year of life, a finding with theoretical and clinical impact. There is evidence that early mastery of the phonetic units of language requires learning in a social context. Neuroscience on early language learning is beginning to reveal the multiple brain systems that underlie the human language faculty.

  6. Moral Development Interventions in Early Adolescence.

    Science.gov (United States)

    Enright, Robert D; And Others

    1983-01-01

    Strategies for promoting moral development in early adolescence reviewed include the "plus-one" model, Deliberate Psychological Education, didactic courses in social studies, and a high school Just Community on moral reasoning. (CJ)

  7. New Eczema Drug Promising in Early Trial

    Science.gov (United States)

    ... page: https://medlineplus.gov/news/fullstory_163883.html New Eczema Drug Promising in Early Trial Nemolizumab significantly ... the appearance of moderate to severe eczema, a new, preliminary trial finds. Nemolizumab is a man-made, ...

  8. [Diagnosis and early treatment of juvenile delinquency].

    Science.gov (United States)

    Barbagallo, A; Bellia, A; Benvenuto, G; Cosentino, F; Riggio, T M

    1975-09-12

    Longitudinal research has shown that social failure to adjust can be prevented by early removal of ambiental factors encouraging pathological development of the Ego, and the detection and treatment of psychological tendencies towards the acquisition of deviant stimuli.

  9. Early School Leaving: Reasons and Consequences

    Directory of Open Access Journals (Sweden)

    Erika GYÖNÖS

    2011-11-01

    Full Text Available Early school leaving represents a loss of potential that has effects on both social and economic scale (reduced social cohesion, lower financial incomes, increase of social allocations. Early school leaving has various reasons that can be either social or economic. Due to the average statistics of the 27 countries of the European Union, in 2008 78,5% of the populations of these countries went to school regularly, whereas the same statistics applied for Romania showed an extent of 78,3%. The statistics of early school leaving showed some 14, 9% in the countries of the EU, whereas in Romania this index was higher (15, 9%. Sequel to some analyses we can state that there is a strong relationship between the variables named participation in education and early school leaving; more than that, there is a strong relationship between the extent of school studies completion and the rate of unemployment.

  10. Early detection of COPD in general practice

    DEFF Research Database (Denmark)

    Ulrik, Charlotte Suppli; Løkke, Anders; Dahl, Ronald

    2011-01-01

    Early detection enables the possibility for interventions to reduce the future burden of COPD. The Danish National Board of Health recommends that individuals >35 years with tobacco/occupational exposure, and at least 1 respiratory symptom should be offered a spirometry to facilitate early...... detection of COPD. The aim, therefore, was to provide evidence for the feasibility and impact of doing spirometry in this target population....

  11. Shifts in Color Discrimination during Early Pregnancy

    OpenAIRE

    Levente L. Orbán; Farhad N. Dastur

    2012-01-01

    The present study explores two hypotheses: a) women during early pregnancy should experience increased color discrimination ability, and b) women during early pregnancy should experience shifts in subjective preference away from images of foods that appear either unripe or spoiled. Both of these hypotheses derive from an adaptive view of pregnancy sickness that proposes the function of pregnancy sickness is to decrease the likelihood of ingestion of foods with toxins or teratogens. Changes to...

  12. Radiation Therapy for Early Stage Lung Cancer

    OpenAIRE

    Parashar, Bhupesh; Arora, Shruthi; Wernicke, A. Gabriella

    2013-01-01

    Radiation therapy for early stage lung cancer is a promising modality. It has been traditionally used in patients not considered candidates for standard surgical resection. However, its role has been changing rapidly since the introduction of new and advanced technology, especially in tumor tracking, image guidance, and radiation delivery. Stereotactic radiation therapy is one such advancement that has shown excellent local control rates and promising survival in early stage lung cancer. In a...

  13. Solar Index prediction methodology for early delivery

    Energy Technology Data Exchange (ETDEWEB)

    Lantz, L.J.

    1980-01-01

    Since the beginning of the Solar Index project in 1978, it has been one of the primary objectives to deliver the Indices in mid-afternoon local standard time. This was desirable because it would make it possible to have the numbers broadcast in the early evening news. A short description of the current project is presented and then a summary of the work that led to the early delivery of the Solar Index is given.

  14. Early x-ray diagnosis of coxarthrosis

    Energy Technology Data Exchange (ETDEWEB)

    Lingg, G.; Nebel, G.

    Radiological and pathological comparisons on specimen of femur head and neck at autopsy have shown a statistical relationship between osteophytosis of the femoral head and ulcerations of the joint cartilage. Especially, there are highly significant relationships between the length of osteophytes and the diameter of the ulcera. The 'plaque'-sign is shown to be a very sensitive indicator of early arthrosis. So there exist semiquantitative parameters for the X-ray diagnosis of early coxarthrosis.

  15. Persistent akathisia associated with early tardive dyskinesia.

    OpenAIRE

    Barnes, T. R.; Braude, W M

    1984-01-01

    Two psychiatric patients developed moderate or severe oro-facial dyskinesia, and limb dyskinesia, at a relatively young age and within a year of starting antipsychotic drug-treatment. This early appearance of tardive dyskinesia was preceded by akathisia that had developed at the beginning of drug therapy and persisted, despite the reduction of their drug doses to maintenance levels. The possibility that persistent akathisia may herald the early onset of tardive dyskinesia, is discussed.

  16. The SuperNova Early Warning System

    OpenAIRE

    Scholberg, K.

    2008-01-01

    A core collapse in the Milky Way will produce an enormous burst of neutrinos in detectors world-wide. Such a burst has the potential to provide an early warning of a supernova's appearance. I will describe the nature of the signal, the sensitivity of current detectors, and SNEWS, the SuperNova Early Warning System, a network designed to alert astronomers as soon as possible after the detected neutrino signal.

  17. Early development of the aplacophoran mollusc Chaetoderma

    DEFF Research Database (Denmark)

    Nielsen, Claus; Haszprunar, Gerhard; Ruthensteiner, Bernhard;

    2007-01-01

    The early development of the trochophore larva of the aplacophoran Chaetoderma nitidulum (Mollusca: Caudofoveata = Chaetodermomorpha) is described using scanning and transmission electron microscopy and using fluorescence staining and confocal laser scanning microscopy of the muscle system...... of the early anlagen of the circular body wall muscles does not show the anterior-posterior mode of formation that is typical for annelids, thus strengthening the hypothesis of a non-segmented ancestry of Mollusca....

  18. Supersymmetry: Early Roots That Did Not Grow

    Directory of Open Access Journals (Sweden)

    Cecilia Jarlskog

    2015-01-01

    Full Text Available This paper is about early roots of supersymmetry, as found in the literature from 1940s and early 1950s. There were models where the power of “partners” in alleviating divergences in quantum field theory was recognized. However, other currently known remarkable features of supersymmetry, such as its role in the extension of the Poincaré group, were not known. There were, of course, no supersymmetric nonabelian quantum field theories in those days.

  19. Sterile neutrinos in the early universe

    Energy Technology Data Exchange (ETDEWEB)

    Malaney, R.A. (Lawrence Livermore National Lab., CA (USA)); Fuller, G.M. (California Univ., San Diego, La Jolla, CA (USA). Dept. of Physics)

    1990-11-14

    We discuss the role played by right-handed sterile neutrinos in the early universe. We show how well known {sup 4}He constraint on the number of relativistic degrees of freedom at early times limits the equilibration of the right handed neutrino sea with the background plasma. We discuss how this allows interesting constraints to be placed on neutrino properties. In particular, a new limit on the Dirac mass of the neutrino is presented. 12 refs.

  20. Music as therapy in early history.

    Science.gov (United States)

    Thaut, Michael H

    2015-01-01

    The notion of music as therapy is based on ancient cross-cultural beliefs that music can have a "healing" effect on mind and body. Explanations for the therapeutic mechanisms in music have almost always included cultural and social science-based causalities about the uses and functions of music in society. However, it is also important to note that the view of music as "therapy" was also always strongly influenced by the view and understanding of the concepts and causes of disease. Magical/mystical concepts of illness and "rational" medicine probably lived side by side for thousands of years. Not until the late-nineteenth and early-twentieth centuries were the scientific foundations of medicine established, which allowed the foundations of music in therapy to progress from no science to soft science and most recently to actual brain science. Evidence for "early music therapy" will be discussed in four broad historical-cultural divisions: preliterate cultures; early civilizations in Mesopotamia, Egypt, Israel; Greek Antiquity; Middle Ages, Renaissance, and Baroque. In reviewing "early music therapy" practice, from mostly unknown periods of early history (using preliterate cultures as a window) to increasingly better documented times, including preserved notation samples of actual "healing" music, five theories and applications of early music therapy can be differentiated.

  1. [Early neurological-neurosurgical rehabilitation. Current state].

    Science.gov (United States)

    Bertram, M; Brandt, T

    2007-10-01

    In German neurorehabilitation, the ambiguous term "early rehabilitation" reflects the multidisciplinary, rehabilitative treatment of severely impaired patients in continuing need of acute and intensive care (including weaning from the respirator in selected cases). The actual definition of this treatment is discussed, which hitherto corresponded to Phase B according to recommendations of the German Federal Study Group for Rehabilitation (BAR) and now has started to be integrated into the diagnosis-related group system. The tasks and aims of early rehabilitation are to support and enhance neuroplastic remission of nervous system functional loss and continued medical care, improve vigilance, establish cooperativity, and evaluate the rehabilitation potential including compensatory and adaptive strategies organizing posthospital care, reducing the need of nursing support, and improving quality of life. Some special aspects of early rehabilitative care are presented here in more detail. To fulfill these tasks, a multidisciplinary team is required including various therapists qualified for neurorehabilition, physicians (including a neurologist), nurses, and social workers. Outcome data were assessed using our 5-year prospective early rehabilitation registry. Fifty-five percent of patients improved to reach the next step of neurorehabilitation (Phase C), with significant gain in function even in the subgroup of aged and most severely disabled patients. The trend to transfer patients very early in the postacute Phase to early rehabilitation facilities, with open medical problems and increased risk of complications, makes close cooperation and interaction with acute medical centers necessary.

  2. Role of early audiological screening and intervention

    Directory of Open Access Journals (Sweden)

    Isha Preet Tuli

    2012-01-01

    Full Text Available Objectives: The aim of our study is to find out whether early identification and intervention prevents severe linguistic and communication delays, minimizing the need for more elaborate rehabilitation during the school years. Design and Study Sample: A Cross-sectional study was carried out on one hundred and eleven children with documented deaf-mutism presenting at the Department of Oto-Rhino-Laryngology in two different geographical regions of India. Detailed history, clinical and audiological assessment along with assessment of the language and communication skills according to American Speech Language Hearing Association (ASHA guidelines was done. Results: The children were predominantly male, of low socio-economic background, presented for rehabilitation, mostly after the age of six years. They commonly had more than 70dBHL (decibel hearing level hearing threshold. The study found that the children who presented early for diagnosis and hearing aid usage had better response to rehabilitation. Conclusion: It is important that hearing loss be detected at an early age and amplification should be introduced as early as possible once there has been a diagnosis of a hearing loss. So that early intervention can have an impact on speech and language development. Without concurrent follow-up program, identification of hearing loss early in children is meaningless.

  3. Precursors of adolescent substance use from early childhood and early adolescence: testing a developmental cascade model.

    Science.gov (United States)

    Sitnick, Stephanie L; Shaw, Daniel S; Hyde, Luke W

    2014-02-01

    This study examined developmentally salient risk and protective factors of adolescent substance use assessed during early childhood and early adolescence using a sample of 310 low-income boys. Child problem behavior and proximal family risk and protective factors (i.e., parenting and maternal depression) during early childhood, as well as child and family factors and peer deviant behavior during adolescence, were explored as potential precursors to later substance use during adolescence using structural equation modeling. Results revealed that early childhood risk and protective factors (i.e., child externalizing problems, mothers' depressive symptomatology, and nurturant parenting) were indirectly related to substance use at the age of 17 via risk and protective factors during early and middle adolescence (i.e., parental knowledge and externalizing problems). The implications of these findings for early prevention and intervention are discussed.

  4. Early Career Support Program: Telecommunication Mentoring for Rural Teachers.

    Science.gov (United States)

    Thoresen, Carol

    1997-01-01

    Describes the Early Career Support Program (STEP) which uses the Montana Educational Telecommunication Network (METNET) to connect early career teachers in Montana with mentors. Contains 20 references. (DDR)

  5. Notes on the discovery of Permian Acipenseriformes in China

    Institute of Scientific and Technical Information of China (English)

    LU Liwu; LI Daqing; YANG Liangfeng

    2005-01-01

    @@ Acipenseriformes is a primitive group of Osteichthyan fishes. Most of its living representatives, such as Psephurus gladius and Acipenser sinensis of the Yangtze River, are fishes facing extinction. Up to now, the earliest fossil Acipenseriformes is Chondrosteus found in the Early Jurassic of England[1].

  6. Salinity effects on Atlantic sturgeon growth and osmoregulation

    Science.gov (United States)

    The Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus Mitchill, 1815) is an anadromous sturgeon species, yet little is known with regard to its osmoregulatory ability and habitat use at early life stages. In order to examine whether salinity poses a physiological challenge to juvenile Atlantic stur...

  7. Exemestane in early breast cancer: a review

    Directory of Open Access Journals (Sweden)

    Michael Untch

    2008-12-01

    Full Text Available Michael Untch1, Christian Jackisch21Interdisciplinary Breast Centre, Helios Klinikum Berlin-Buch, University Charité, Berlin, Germany; 2Department of Gynecology/Obstetrics, Klinikum Offenbach GmbH, Offenbach, GermanyAbstract: The adjuvant treatment of women with endocrine-sensitive early breast cancer has been dominated for the last 40 years by tamoxifen. However, the side-effects associated with this therapy have prompted a search for safer and biochemically more selective endocrine agents and led to the development of the third-generation aromatase inhibitors (AIs anastrozole, letrozole and exemestane. Promising results in advanced disease have paved the way for treating early breast cancer, and AIs are increasingly replacing tamoxifen in the adjuvant setting. Several large, randomized trials with AIs have been completed or are ongoing in women with early-stage breast cancer, documenting the significant impact that these drugs are making on the risk for recurrence of breast cancer. As a result, there is increasing and widespread use of AI therapy for the treatment of early-stage endocrine-responsive breast cancer. This review summarizes the data for exemestane in the adjuvant setting, showing that a switch to exemestane after 2 to 3 years of tamoxifen therapy is associated with a statistically significant survival benefit and is regarded as being sensitive by international and national experts.Keywords: early breast cancer, adjuvant setting, endocrine-sensitive, tamoxifen, aromatase inhibitor, exemestane, switch, IES 31, NSABP B-33, TEAM

  8. Design Application Early Childhood Education Based Mobile

    Directory of Open Access Journals (Sweden)

    Annah

    2016-02-01

    Full Text Available This study aims to make learning media for Early Childhood Education in the form especially its mobile applications for Android-based smartphones. In the process of teaching and learning for Early Childhood Education is still often found constraints experienced teaching force is limited props so that learners are less eager to learn. In addition, parents also have difficulty returning to guide or teach the learning materials at home because it has no alternative instructional media. In compiling this research report author uses the Android-based Mobile Devices Applications created using the Java programming language through the Eclipse editor. Based on the results of the research, concluded that these applications can be applied in the latest version of the Android platform to its current platform version of Jellybean. Application of Learning can be used as an alternative way of learning for Early Childhood Education so as to overcome the lack of props in institutions of Early Childhood Education, can be used to be taught at home, and provide new teaching methods to early childhood so that a form of learning that is obtained is not the monotony of one form of learning how.

  9. Environmental and genetic influences on early attachment

    Directory of Open Access Journals (Sweden)

    Gervai Judit

    2009-09-01

    Full Text Available Abstract Attachment theory predicts and subsequent empirical research has amply demonstrated that individual variations in patterns of early attachment behaviour are primarily influenced by differences in sensitive responsiveness of caregivers. However, meta-analyses have shown that parenting behaviour accounts for about one third of the variance in attachment security or disorganisation. The exclusively environmental explanation has been challenged by results demonstrating some, albeit inconclusive, evidence of the effect of infant temperament. In this paper, after reviewing briefly the well-demonstrated familial and wider environmental influences, the evidence is reviewed for genetic and gene-environment interaction effects on developing early attachment relationships. Studies investigating the interaction of genes of monoamine neurotransmission with parenting environment in the course of early relationship development suggest that children's differential susceptibility to the rearing environment depends partly on genetic differences. In addition to the overview of environmental and genetic contributions to infant attachment, and especially to disorganised attachment relevant to mental health issues, the few existing studies of gene-attachment interaction effects on development of childhood behavioural problems are also reviewed. A short account of the most important methodological problems to be overcome in molecular genetic studies of psychological and psychiatric phenotypes is also given. Finally, animal research focusing on brain-structural aspects related to early care and the new, conceptually important direction of studying environmental programming of early development through epigenetic modification of gene functioning is examined in brief.

  10. Treatment modalities for early gastric cancer

    Institute of Scientific and Technical Information of China (English)

    Jesús; Espinel; Eugenia; Pinedo; Vanesa; Ojeda; Maria; Guerra; del; Rio

    2015-01-01

    Different treatment modalities have been proposed in the treatment of early gastric cancer(EGC). Endoscopic resection(ER) is an established treatment that allows curative treatment, in selected cases. In addition, ER allows for an accurate histological staging, which is crucial when deciding on the best treatment option for EGC. Recently, endoscopic mucosal resection(EMR) and endoscopic submucosal dissection(ESD) have become alternatives to surgery in early gastric cancer, mainly in Asian countries. Patients with "standard" criteria can be successfully treated by EMR techniques. Those who meet "expanded" criteria may benefit from treatment by ESD, reducing the need for surgery. Standardized ESD training system is imperative to promulgate effective and safe ESD technique to practices with limited expertise. Although endoscopic resection is an option in patients with EGC, surgical treatment continues to be a widespread therapeutic option worldwide. In this review we tried to point out the treatment modalities for early gastric cancer.

  11. Early Detection of Alzheimer's - A Crucial Requirement

    CERN Document Server

    Bukhari, Ijaz

    2013-01-01

    Alzheimer's, an old age disease of people over 65 years causes problems with memory, thinking and behavior. This disease progresses very slow and its identification in early stages is very difficult. The symptoms of Alzheimer's appear slowly and gradually will have worse effects. In its early stages, not only the patients themselves but their loved ones are generally unable to accept that the patient is suffering from disease. In this paper, we have proposed a new algorithm to detect patients of Alzheimer's at early stages by comparing the Magnetic Resonance Images (MRI) of the patients with normal persons of their age. The progress of the disease can also be monitored by periodic comparison of the previous and current MRI.

  12. DYNAMICS OF INTERHEMISPHERIC RELATIONSHIPS IN EARLY ONTOGENESIS

    Directory of Open Access Journals (Sweden)

    E.M. Berdichevskaia

    2011-12-01

    Full Text Available Studying cerebral hemispheric interaction and the principles of their coordination allow to understand the central adaptational and compensatory mechanisms in the early developmental process of children. Objectification of the level of motor function development in children in early ontogenesis, its relationship with the profile of interhemispheric organization of the brain, and its dynamics with age is highly relevant today. With the participation of 260 practically healthy children, including 74 children age 3 to 4 years and 186 age 6 to 7 years, we studied intra- and interhemispheric relations in the motor domain using the test of finger synkinesis in the early stages of childhood. Results showed that the amount of finger synkineses, and consequently the level of integration of intra- and interhemispheric relations in the brain of the child, depended on the child’s age. Besides, the magnitude, character, positive and negative dynamics of synkineses in the process of adaptation to school depend on the lateral phenotype.

  13. Interactive early warning technique based on SVDD

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    After reviewing current researches on early warning,it is found that"bad" data of some systems is not easy to obtain,which makes methods proposed by these researches unsuitable for monitored systems.An interactive early warning technique based on SVDD(support vector data description)is proposed to adopt"good" data as samples to overcome the difficulty in obtaining the"bad"data.The process consists of two parts:(1)A hypersphere is fitted on"good"data using SVDD.If the data object are outside the hypersphere,it would be taken as"suspicious";(2)A group of experts would decide whether the suspicious data is"bad"or"good",early warning messages would be issued according to the decisions.And the detailed process of implementation is proposed.At last,an experiment based on data of a macroeconomic system is conducted to verify the proposed technique.

  14. Early Universes with Effective Discrete Time

    CERN Document Server

    Baulieu, Laurent

    2016-01-01

    The mechanism for triggering the universe inflation could be that at very early periods the time variable was discrete instead of smooth. Alternatively, and perhaps equivalently, it could be the consequence that the metrics of the early universe was a strongly concentrated gravitational coherent state with very high frequency oscillations, allowing local pair creations by a generalisation to gravity of the Schwinger mechanism, perhaps by creation of black holes of masses superior to the Planck scale. The lattice spacing between two clicks in the discrete time picture corresponds to the inverse frequency of the gravitational coherent state in the other picture. In both cases, a much lower time than the Planck time might represent a new fundamental scale, giving new type of physics. To make possible a concrete estimation of the pair production probability, we propose that the oscillating coherent state metrics that defines this very early geometry minimises the Einstein gravity action coupled to interacting 1-,...

  15. Early executive function predicts reasoning development.

    Science.gov (United States)

    Richland, Lindsey E; Burchinal, Margaret R

    2013-01-01

    Analogical reasoning is a core cognitive skill that distinguishes humans from all other species and contributes to general fluid intelligence, creativity, and adaptive learning capacities. Yet its origins are not well understood. In the study reported here, we analyzed large-scale longitudinal data from the Study of Early Child Care and Youth Development to test predictors of growth in analogical-reasoning skill from third grade to adolescence. Our results suggest an integrative resolution to the theoretical debate regarding contributory factors arising from smaller-scale, cross-sectional experiments on analogy development. Children with greater executive-function skills (both composite and inhibitory control) and vocabulary knowledge in early elementary school displayed higher scores on a verbal analogies task at age 15 years, even after adjusting for key covariates. We posit that knowledge is a prerequisite to analogy performance, but strong executive-functioning resources during early childhood are related to long-term gains in fundamental reasoning skills.

  16. Early childhood caries: a New Zealand perspective

    Directory of Open Access Journals (Sweden)

    Bach K

    2014-06-01

    Full Text Available Dental caries, primarily a preventable disease, remains the most common chronic disease of childhood and one of the most common reasons for hospital admissions for children in New Zealand. The most vulnerable children are shouldering the burden of the disease, with Maori and Pacific children having greater experience and severity of dental caries. Early childhood caries has deleterious effects on a child’s oral and general health and significant numbers of preschool-aged children experience pain and infection. Early identification by primary health care providers of children at high risk of developing early childhood caries can ensure these children are referred to the appropriate oral health services to receive appropriate and timely management.

  17. Automatic earthquake confirmation for early warning system

    Science.gov (United States)

    Kuyuk, H. S.; Colombelli, S.; Zollo, A.; Allen, R. M.; Erdik, M. O.

    2015-07-01

    Earthquake early warning studies are shifting real-time seismology in earthquake science. They provide methods to rapidly assess earthquakes to predict damaging ground shaking. Preventing false alarms from these systems is key. Here we developed a simple, robust algorithm, Authorizing GRound shaking for Earthquake Early warning Systems (AGREEs), to reduce falsely issued alarms. This is a network threshold-based algorithm, which differs from existing approaches based on apparent velocity of P and S waves. AGREEs is designed to function as an external module to support existing earthquake early warning systems (EEWSs) and filters out the false events, by evaluating actual shaking near the epicenter. Our retrospective analyses of the 2009 L'Aquila and 2012 Emilia earthquakes show that AGREEs could help an EEWS by confirming the epicentral intensity. Furthermore, AGREEs is able to effectively identify three false events due to a storm, a teleseismic earthquake, and broken sensors in Irpinia Seismic Network, Italy.

  18. Bursts from the very early universe

    Energy Technology Data Exchange (ETDEWEB)

    Silk, J. [Department of Physics, University of Oxford, Oxford OX1 3RH (United Kingdom); Stodolsky, L. [Max-Planck-Institut fuer Physik, Foehringer Ring 6, 80805 Munich (Germany)]. E-mail: les@mppmu.mpg.de

    2006-07-27

    Bursts of weakly interacting particles such as neutrinos or even more weakly interacting particles such as wimps and gravitons from the very early universe would offer a much deeper 'look back time' to early epochs than is possible with photons. We consider some of the issues related to the existence of such bursts and their detectability. Characterizing the burst rate by a probability P per Hubble four-volume we find, for events in the radiation-dominated era, that the natural unit of description is the present intensity of the CMB times P. The existence of such bursts would make the observation of pheno associated with very early times in cosmology at least conceptually possible. One might even hope to probe the transplanckian epoch if complexes more weakly interacting than the graviton can exist. Other conceivable applications include the potential detectability of the formation of 'pocket universes' in a multiverse.

  19. The Political Economy of Early Exit

    DEFF Research Database (Denmark)

    Schmitt, Carina; Starke, Peter

    2016-01-01

    Large-scale exit from the labour market began in the 1970s in many OECD countries. The literature indicates that individual early retirement decisions are facilitated by generous and accessible ‘pathways’ into retirement in the public pension system, unemployment insurance or disability benefits....... It is unclear, however, why early exit became so much more prevalent in some countries than in others and why such differences remain, despite a recent shift back towards higher employment rates and ‘active ageing’. We test a logic of sectoral cost-shifting politics involving cross-class alliances...... in the tradable sector, against a more traditional class-based logic of welfare state policy-making. Quantitative analysis of employment outcomes in 21 countries shows that the political economy of early exit clearly rests on the sectoral politics of cost-shifting....

  20. Food Policing in Early Modern Danish Towns

    DEFF Research Database (Denmark)

    2016-01-01

    This article explores the efforts of early modern authorities to provide food security in three different Danish towns in order to understand the goals and methods of early modern food policing. As in other European countries, urban authorities were expected as part of the regulation called ‘the...... police’ to control the guilds and fix the prices on bread, meat, beer and other life necessities in order to avoid scarcity among the urban poor. In 1682-83 the Danish king a police force in Copenhagen and the other market towns. The goal of the metropolitan police was to increase the population...... of the capital and thus increase the military-fiscal power of the absolutist state, by providing food security and even a comfortable life. In practice, the vigilant policing of bakers, butchers and brewers proved difficult. The positive economic effect of food policing was doubted early on and was reduced...

  1. A Survey Study of Early Childhood Teachers' Beliefs and Confidence about Teaching Early Math

    Science.gov (United States)

    Chen, Jie-Qi; McCray, Jennifer; Adams, Margaret; Leow, Christine

    2014-01-01

    This study reports on results from the Early Mathematics Beliefs and Confidence Survey, administered to 346 preschool teachers in a large public school system in the Midwest. Survey results depict a much more positive view of teachers' beliefs and confidence in early math teaching than previously reported. Results also suggest that teacher…

  2. Early Entries into Adult Roles: Associations with Aggressive Behavior from Early Adolescence into Young Adulthood

    Science.gov (United States)

    Roche, Kathleen M.; Ensminger, Margaret E.; Ialongo, Nicholas; Poduska, Jeanne M.; Kellam, Sheppard G.

    2006-01-01

    This study examines how early entries into adult roles are associated with aggressive and violent behavior occurring from early adolescence to young adulthood among 499 males and 578 females living in low-income, central-city neighborhoods. Among males, engagement in adult roles accounted for the relationship between higher levels of aggressive…

  3. Implementation of the Integrated Early Childhood Policy in Senegal. Early Childhood and Family Policy Series.

    Science.gov (United States)

    Rayna, Sylvie

    As part of a UNESCO-sponsored series of studies examining how integrated and coordinated early childhood policies are implemented, this case study focuses on Senegal's integrated early childhood policy. The case study examines the context for policy development and analyzes the structure and resources of the Ministry for the Family and Early…

  4. Early treatment of trans-tibial amputees: retrospective analysis of early fitting and elastic bandaging

    NARCIS (Netherlands)

    Velzen, van A.D.; Nederhand, M.J.; Emmelot, C.H.; IJzerman, M.J.

    2005-01-01

    This study investigates the effects of early fitting in trans-tibial amputees. The assumption is that compared to elastic bandaging, the use of a rigid dressing in early fitting will result in quicker wound healing and earlier ambulation. A retrospective file search was carried out in three differen

  5. Explaining Why Early-Maturing Girls Are More Exposed to Sexual Harassment in Early Adolescence

    Science.gov (United States)

    Skoog, Therése; Bayram Özdemir, Sevgi

    2016-01-01

    In this study, we tested two competing explanations of the previously established link between early female puberty and sexual harassment in early adolescence. The sample included 680 seventh-grade Swedish girls (M[subscript age] = 13.40, SD = 0.53). Findings revealed that looking more sexually mature and being sexually active mediated the link…

  6. Meal frequencies in early adolescence predict meal frequencies in late adolescence and early adulthood

    DEFF Research Database (Denmark)

    Pedersen, Trine Pagh; Holstein, Bjørn E; Flachs, Esben Meulengracht

    2013-01-01

    Health and risk behaviours tend to be maintained from adolescence into adulthood. There is little knowledge on whether meal frequencies in adolescence are maintained into adulthood. We investigated whether breakfast, lunch and evening meal frequencies in early adolescence predicted meal frequencies...... in late adolescence and in early adulthood. Further, the modifying effect of gender and adolescent family structure were investigated....

  7. A Survey Study of Early Childhood Teachers' Beliefs and Confidence about Teaching Early Math

    Science.gov (United States)

    Chen, Jie-Qi; McCray, Jennifer; Adams, Margaret; Leow, Christine

    2014-01-01

    This study reports on results from the Early Mathematics Beliefs and Confidence Survey, administered to 346 preschool teachers in a large public school system in the Midwest. Survey results depict a much more positive view of teachers' beliefs and confidence in early math teaching than previously reported. Results also suggest that teacher…

  8. Early Holocene environmental change, the presence and disappearance of early Mesolithic habitation near Zutphen (The Netherlands)

    NARCIS (Netherlands)

    Bos, J.A.A.; Geel, B. van; Groenewoudt, B.J.; Lauwerier, R.C.G.M

    2005-01-01

    The Early Holocene landscape near Zutphen (The Netherlands) is reconstructed by means of microfossil, macroremain and bone analyses. In this area early Mesolithic sites were found on a river dune along a former river channel. AMS14C dating provided a detailed chronology for the sites and river chann

  9. Family Income Dynamics, Early Childhood Education and Care, and Early Child Behavior Problems in Norway

    Science.gov (United States)

    Zachrisson, Henrik D.; Dearing, Eric

    2015-01-01

    The sociopolitical context of Norway includes low poverty rates and universal access to subsidized and regulated Early Childhood Education and Care (ECEC). In this context, the association between family income dynamics and changes in early child behavior problems was investigated, as well as whether high-quality ECEC buffers children from the…

  10. Early Head Start: Research Findings. Early Childhood Highlights. Volume 1, Issue 2

    Science.gov (United States)

    Child Trends, 2010

    2010-01-01

    Early Head Start is a federally funded community-based program for low-income families with infants and toddlers and for low-income pregnant women. Created in 1995, Early Head Start strives to promote healthy prenatal outcomes for pregnant women, to enhance the development of children ages birth to three, and to promote healthy family functioning.…

  11. THE LONG REACH OF EDUCATION: EARLY RETIREMENT.

    Science.gov (United States)

    Venti, Steven; Wise, David A

    2015-12-01

    The goal of this paper is to draw attention to the long lasting effect of education on economic outcomes. We use the relationship between education and two routes to early retirement - the receipt of Social Security Disability Insurance (DI) and the early claiming of Social Security retirement benefits - to illustrate the long-lasting influence of education. We find that for both men and women with less than a high school degree the median DI participation rate is 6.6 times the participation rate for those with a college degree or more. Similarly, men and women with less than a high school education are over 25 percentage points more likely to claim Social Security benefits early than those with a college degree or more. We focus on four critical "pathways" through which education may indirectly influence early retirement - health, employment, earnings, and the accumulation of assets. We find that for women health is the dominant pathway through which education influences DI participation. For men, the health, earnings, and wealth pathways are of roughly equal magnitude. For both men and women the principal channel through which education influences early Social Security claiming decisions is the earnings pathway. We also consider the direct effect of education that does not operate through these pathways. The direct effect of education is much greater for early claiming of Social Security benefits than for DI participation, accounting for 72 percent of the effect of education for men and 67 percent for women. For women the direct effect of education on DI participation is not statistically significant, suggesting that the total effect may be through the four pathways.

  12. Early Pavlovian conditioning impairs later Pavlovian conditioning.

    Science.gov (United States)

    Lariviere, N A; Spear, N E

    1996-11-01

    Four experiments tested the effects in the rat of very early experience with stimuli to be used later for Pavlovian conditioning. Beginning on postnatal Day 12, prior to the development of substantial detection and effective perception of visual and auditory stimuli, rats were given five daily experiences with either lights or tones and a footshock known to be an effective unconditioned stimulus at these ages. Twenty-four hours after the last of these experiences, pairings of either the light or tone and the unconditioned stimulus were given with parameters established to yield a moderate degree of conditioning in untreated preweanlings (Experiment 1). Experiment 2 determined that early experience with paired or unpaired presentations of either the light or tone and the unconditioned stimulus resulted in a failure to condition to these same lights or tones on postnatal Day 17, although nontreated pups from the same litters conditioned quite effectively. Experiment 3 determined that this early conditioning experience with either paired or unpaired presentations of the lights or tones and the unconditioned stimulus yielded impaired conditioning on postnatal Day 17 in the alternative sensory modality as well, although again nontreated siblings conditioned quite effectively. Experiment 4 replicated the results of each of Experiments 2 and 3 and determined in addition that despite the impairment in conditioning that resulted from early paired or unpaired experience with the stimuli of conditioning, early experience with the individual stimuli of conditioning-with only the CS, the US, or the context-did not result in a similar impairment in conditioning. Although the results were unexpected, they may be understood in part in terms of intersensory competition during development, and there is precedent in the literature for similar interfering effects of early learning on later learning in a variety of species.

  13. Research Funding Opportunities for Early Career Scientists

    Science.gov (United States)

    Wiener, Richard

    2009-10-01

    This talk will describe opportunities for early career faculty members in the physical sciences to obtain funding for scientific research and educational projects. I will discuss programs offered by Research Corporation for Science Advancement, a private nonprofit foundation, which include opportunities for scientists at primarily undergraduate institutions and at research universities. I will emphasize strategies for successful grant writing. The target audience is early career academic scientists in Astronomy, Physics, and related fields, as well as graduate students and postdoctoral researchers considering careers in these academic disciplines.

  14. Parental experiences of early postnatal discharge

    DEFF Research Database (Denmark)

    Nilsson, Ingrid; Danbjørg, Dorthe B.; Aagaard, Hanne

    2015-01-01

    OBJECTIVE: the aim of this study was to investigate new parents׳ experiences of early postnatal discharge. DESIGN: a meta-synthesis including 10 qualitative studies was conducted using Noblit and Hare׳s method of meta-synthesis development. SETTING: qualitative studies performed in western...... postnatal care that included both parents, having influence on time of discharge, and getting individualised and available support focused on developing and recognising their own experiences of taking care of the baby. CONCLUSIONS AND IMPLICATIONS FOR PRACTICE: the new parents׳ experiences of early...

  15. Sulphur tales from the early Archean world

    Science.gov (United States)

    Montinaro, A.; Strauss, H.

    2016-07-01

    Sedimentary and magmatic rocks and their distinct sulphur isotopic signatures indicate the sources and processes of sulphur cycling, in particular through the analysis of all four stable sulphur isotopes (32S, 33S, 34S and 36S). Research over the past 15 years has substantially advanced our understanding of sulphur cycling on the early Earth, most notably through the discovery of mass-independently fractionated sulphur isotopic signatures. A strong atmospheric influence on the early Archean global sulphur cycle is apparent, much in contrast to the modern world. Diverse microbially driven sulphur cycling is clearly discernible, but its importance for Earth surface environments remains to be quantified.

  16. Early labour market returns to college subjects

    DEFF Research Database (Denmark)

    Buonanno, Paolo; Pozzoli, Dario

    This paper aims at estimating early labour market outcomes  of Italian university graduates across college subjects. We devote great attention to endogenous selection issues using alternative methods to control for potential self-selection associated with the choice of the degree subject in order...... to unravel the causal link between college major and subsequent outcomes in the labour market.  Our results suggest that "quantitative" fields (i.e. Sciences, Engineering and Economics) increase not only the speed of transition into the first job and employment probability but also early earnings...

  17. Early Labour Market Returns to College Subject

    DEFF Research Database (Denmark)

    Buonanno, Paolo; Pozzoli, Dario

    2009-01-01

    We estimate early labour market outcomes of Italian university  graduates across college subjects. We devote great attention to endogenous selection issues using alternative methods to control for potential self-selection associated with the choice of the degree subject in order to unravel...... the causal link between college major and subsequent outcomes in the labour market. Our results suggest that 'quantitative' fields (i.e. Sciences, Engineering, and Economics) increase not only the speed of transition into the first job and employment probability but also early earnings, conditional...

  18. Early labour market returns to college subject

    DEFF Research Database (Denmark)

    Pozzoli, Dario; Buonanno, Paolo

    This paper aims at estimating early labour market outcomes  of Italian university graduates across college subjects. We devote great attention to endogenous selection issues using alternative methods to control for potential self-selection associated with the choice of the degree subject in order...... to unravel the causal link between college major and subsequent outcomes in the labour market.  Our results suggest that "quantitative" fields (i.e. Sciences, Engineering and Economics) increase not only the speed of transition into the first job and employment probability but also early earnings...

  19. Internet worm early detection and response mechanism

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    In recent years, fast spreading worm has become one of the major threats to the security of the Internet and has an increasingly fierce tendency.In view of the insufficiency that based on Kalman filter worm detection algorithm is sensitive to interval, this article presents a new data collection plan and an improved worm early detection method which has some deferent intervals according to the epidemic worm propagation model, then proposes a worm response mechanism for slowing the wide and fast worm propagation effectively.Simulation results show that our methods are able to detect worms accurately and early.

  20. International Orders in the Early Modern World

    DEFF Research Database (Denmark)

    This book challenges the Eurocentric foundations of modern International Relations scholarship. Its primary empirical focus is the early modern era, when European primacy had yet to develop in many parts of the globe. It presents a series of regional case studies from experts on East Asia....... Focusing on a crucial period of global history that has been neglected in the field of International Relations, the book reveals profound differences between the early modern era and the more familiar colonial conquests of the second half of the nineteenth century. It will be interest to students...

  1. New Method for Early Cancer Diagnosis

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    @@ The NSFC funded Key Program project"A real-time analysis of the early diagnosis of cancer mark-ers",undertaken by Changchun Institute of Applied Chemistry,Chinese Academy of Sciences (CAS),re-cently received recognition from an expert team for assessment.Experts pointed out that the research was of great value for the fast ascertain of cancer markers and the early warning and diagnosis.The research team was headed by Academician Wang Erkang,CAS and Prof.Kong Jilie,Fudan University.

  2. PROBLEM OF DIAGNOSIS OF EARLY CONGENITAL SYPHILIS

    Directory of Open Access Journals (Sweden)

    G. P. Martynova

    2013-01-01

    Full Text Available The paper presents a case of delayed diagnosis of early congenital syphilis in a child whose mother was observed in prenatal clinic starting from the 14th week of pregnancy. The child had specific skin rash already in maternity. The child was discharged home without examination in the hospital. Only manifestations of nephritis lead to admission of the child into an inpatient hospital. Only at the age of 1 month and 23 days the child was suspected of early congenital syphilis with severe polisimptomnym, and the patient was transferred to specialized hospital. 

  3. Early Home Supported Discharge of Stroke Patients:

    DEFF Research Database (Denmark)

    Larsen, Torben; Olsen, T. Skyhøj; Sørensen, Jan

    2006-01-01

    OBJECTIVES: A comprehensive and systematic assessment (HTA) of early home-supported discharge by a multidisciplinary team that plans, coordinates, and delivers care at home (EHSD) was undertaken and the results were compared with that of conventional rehabilitation at stroke units. METHODS......: A systematic literature search for randomized trials (RCTs) on "early supported discharge" was closed in April 2005. RCTs on EHSD without information on (i) death or institution at follow-up, (ii) change in Barthél Index, (iii) length of hospital stay, (iv) intensity of home rehabilitation, or (v) baseline...

  4. WMAP - A Glimpse of the Early Universe

    Science.gov (United States)

    Wollack, Edward

    2009-01-01

    The early Universe was incredibly hot, dense, and homogeneous. A powerful probe of this time is provided by the relic radiation which we refer to today as the Cosmic Microwave Background (CMB). Images produced from this light contain the earliest glimpse of the Universe after the "Big Bang" and the signature of the evolution of its contents. By exploiting these clues, precise constraints on the age, mass density, and geometry of the early Universe can be derived. The history of this intriguing cosmological detective story will be reviewed. Recent results from NASA's Wilkinson Microwave Anisotropy Probe (WMAP) will be presented.

  5. Specifications in early conceptual design work

    DEFF Research Database (Denmark)

    Hansen, Claus Thorp; Andreasen, Mogens Myrup

    2007-01-01

    In early conceptual design the design team is working in an uncertain situation, where the understanding of a need is limited and not much is known about the solution space. In this situation the design team has to both analyse need and explore solution space. Thus, the team has to formulate design...... specification in early conceptual design consists of few specification statements, which express value, important aspects of product context and articulate key functions. A product design specification, which contains a lot of specification statements about product properties, is not productive to support...

  6. Early mathematics intervention in a Danish municipality

    DEFF Research Database (Denmark)

    Lindenskov, Lena; Weng, Peter

    2013-01-01

    We describe a pilot project 2009 – 2010 about early intervention in second grade mathematics (about 8 years old) in Frederiksberg, a Danish urban municipality. We shortly describe the background of the pilot project, aims and organisation in four design cycles. We explore the pilot teachers' feed...... as a starting point. We find an urgent need to develop and research projects on early intervention in Nordic school culture, preferably in critical dialogue with international research in this field. , while critically discussing ideas and experiences from other countries....

  7. Early Paralysis for the Management of ARDS.

    Science.gov (United States)

    Grawe, Erin S; Bennett, Suzanne; Hurford, William E

    2016-06-01

    The use of neuromuscular blocking agents (NMBAs) early in the development of ARDS has been a strategy of interest for many years. The use of NMBAs with a concomitant deep sedation strategy can increase oxygenation and possibly decrease mortality when used in the early stages of ARDS. The mechanism by which this occurs is unclear but probably involves a combination of factors, such as improving patient-ventilator synchrony, decreasing oxygen consumption, and decreasing the systemic inflammatory response associated with ARDS. The use of NMBA and deep sedation for these patients is not without consequence. This discussion describes the rationale and evidence behind the use of NMBAs in the setting of ARDS.

  8. Gamma-Ray Burst Early Afterglows

    CERN Document Server

    Zhang, B

    2005-01-01

    The successful launch and operation of NASA's Swift Gamma-Ray Burst Explorer open a new era for the multi-wavelength study of the very early afterglow phase of gamma-ray bursts (GRBs). GRB early afterglow information is essential to explore the unknown physical composition of GRB jets, the link between the prompt gamma-ray emission and the afterglow emission, the GRB central engine activity, as well as the immediate GRB environment. Here I review some of the recent theoretical efforts to address these problems and describe how the latest Swift data give answers to these outstanding questions.

  9. ENDOSCOPIC TECHNOLOGIES IN EARLY RECTAL CANCER TREATMENT

    Directory of Open Access Journals (Sweden)

    D. V. Samsonov

    2015-01-01

    Full Text Available Total mesorectal excision is the “golden standard” of surgical treatment for rectal cancer. Development of endoscopic technologies allowed to implement the benefits of minimally invasive surgery in early rectal cancer treatment, decrease morbidity and mortality, improve functional outcome and quality of life. Oncological safety of this method is still a subject for discussion due to lack of lymph node harvest. Endoscopic operations for early rectal cancer are being actively implemented in daily practice, but lack of experience does not allow to include this method in national clinical prac-tice guidelines.

  10. Detection and monitoring of early caries lesions

    DEFF Research Database (Denmark)

    Pretty, I A; Ekstrand, K R

    2016-01-01

    AIM: To review the current evidence base of detecting and monitoring early carious lesions in children and adolescents and a rationale proposed to ensure that such lesions are identified and appropriately managed. METHODS: The systematic literature search identified initially a review by Gomez...... of existing visible and radiographical systems to monitor lesions over time. Using low-cost intra-oral cameras facilitates the recording of lesion appearance in the patient record and may be of significant benefit in monitoring early lesions over time following their detection. This benefit extends...

  11. Actionable Intelligence about Early Childhood Risks in Philadelphia

    Science.gov (United States)

    LeBoeuf, Whitney A.; Barghaus, Katherine; Fantuzzo, John; Coe, Kristen; Brumley, Benjamin

    2016-01-01

    "Early childhood risks" are markers of early childhood experiences that extensive research has shown to be detrimental to later academic and behavioral outcomes. In Philadelphia, evidence indicates that seven early childhood risks tracked by public agencies have negative effects on early school outcomes. These risks include low…

  12. Early Requestive Development in Consecutive Third Language Learning

    Science.gov (United States)

    Safont-Jorda, Maria-Pilar

    2011-01-01

    While research on early simultaneous bilingual acquisition is well-documented, studies on multiple language acquisition in early childhood are still needed. Existing studies have mainly focused on early simultaneous acquisition of three or more languages. Some attention has already been paid to early pragmatic differentiation and cross-linguistic…

  13. Geometry in the Early Years: A Commentary

    Science.gov (United States)

    Dindyal, Jaguthsing

    2015-01-01

    The primary goal of this paper is to provide a commentary on the teaching and learning of geometry in the early years of schooling with the set of papers in this issue as a guiding factor. It is structured around issues about geometry education of young learners, such as: what should we teach in geometry and why; representation of geometrical…

  14. Elegiac moods: Early Greek elegy and more

    Directory of Open Access Journals (Sweden)

    Krystyna Bartol

    2011-01-01

    Full Text Available This article explores the relationships and correlations between early Greek elegy (7th—5th c. BC and the elegiac mood of a poem understood today as a nostalgic and melancholic attitude of the subject evoked in a poem. The known surviving ancient texts prove the thematic heterogeneity of the elegiac genre at its early stage of development, while this elegiac emotionality is by no means a distinctive feature of this particular poetical category within the archaic parental context even though it does occur in some works composed in distichs that are traditionally labeled as elegiac (e.g. works of Archilochus and Mimnermus. Elegiac attitude, within modern understanding of the term, is also to be fundin the melic poetry of early Greek poets (such as Sappho, Anacreon and Simonides of Ceos which were, in fact, considered by ancient theoreticians as non elegiac as far as their genre was concerned. The attribution of the elegiac character, not linked genetically with any of genres, to one poetical category is thus a result of multilayered processes of cultural interaction and the reception of the early Greek literature rather than the substance of the genre.

  15. Privatization of Early Childhood Education in Iceland

    Science.gov (United States)

    Dýrfjörð, Kristín; Magnúsdóttir, Berglind Rós

    2016-01-01

    The overall aim of this paper is to give a comprehensive picture of the marketization of early childhood education in Iceland. Our theoretical framework is based on Hursh's (2007) analysis of how the governance of schools is reshaped to serve a neoliberal agenda with the help of internal and external privatization (Ball and Youdell, 2007). In this…

  16. Inclusive discourses in early childhood education?

    DEFF Research Database (Denmark)

    Warming, Hanne

    2011-01-01

    This article explores the discursive formation of inclusion in early childhood education and after-school (recreation) centres in a Danish municipality. While inclusion has been a central educational issue in research and practice for well over quarter of a century, with continuing emphasis...

  17. The discovery and early understanding of leukemia

    NARCIS (Netherlands)

    Kampen, Kim R.

    2012-01-01

    The early history of leukemia reaches back 200 years. In 1811, Peter Cullen defined a case of splenitis acutus with unexplainable milky blood. Alfred Velpeau defined the leukemia associated symptoms, and observed pus in the blood vessels (1825). Alfred Donne detected a maturation arrest of the white

  18. Early Childhood Inclusion in Aotearoa New Zealand

    Science.gov (United States)

    Foster-Cohen, Susan H.; van Bysterveldt, Anne K.

    2016-01-01

    Early childhood education is encouraged for all 3- to 5-year-old children in New Zealand (known in the Maori language as Aotearoa) and is supported by a well-constructed bicultural curriculum (Te Whariki) and reasonably generous government funding. However, a number of factors mitigate against inclusion of children with developmental delays and…

  19. Radiotherapy versus combined modality in early stages

    DEFF Research Database (Denmark)

    Specht, L.; Carde, P.; Mauch, P.;

    1992-01-01

    In early stage Hodgkin's disease the optimal choice of treatment for the individual patient is still an unresolved issue. So far, twenty-two randomized trials of radiotherapy alone versus radiotherapy plus combination chemotherapy have been carried out worldwide. The preliminary results of a glob...

  20. Early Identification of Reading Comprehension Difficulties

    Science.gov (United States)

    Catts, Hugh W.; Nielsen, Diane Corcoran; Bridges, Mindy Sittner; Liu, Yi-Syuan

    2016-01-01

    Most research on early identification of reading disabilities has focused on word reading problems and little attention has been given to reading comprehension difficulties. In this study, we investigated whether measures of language ability and/or response to language intervention in kindergarten uniquely predicted reading comprehension…

  1. Risk Factors for Depression in Early Adolescence

    Science.gov (United States)

    MacPhee, Angela R.; Andrews, Jac J. W.

    2006-01-01

    The purpose of this study was to identify salient risk factors for depression in early adolescence from a group of common predictors. The following nine predictors were examined: (1) perceived quality of peer relationships, (2) perceived parental nurturance, (3) perceived parental rejection, (4) self-esteem, (5) body image, (6) pubertal status,…

  2. Social Early Stimulation of Trisomy-21 Babies

    Science.gov (United States)

    Aparicio, Maria Teresa Sanz; Balana, Javier Menendez

    2003-01-01

    This study was initiated with twenty Down's syndrome babies to verify whether subjects undergoing social early stimulation would benefit from this type of treatment. An experimental study was designed with two training groups: visual or written instructions. The analyses of the results established statistically significant differences in the…

  3. English-speaking in early Surinam?

    NARCIS (Netherlands)

    Smith, N.S.H.; Selbach, R.; Cardoso, H.C.; van den Berg, M.

    2009-01-01

    I assess the opportunities of English-learning for slaves in early Surinam. Under the gradualist approach no creole could develop until the population balance had shifted significantly in favour of the slaves. With the population figures given by Arends for the years 1675, 1684 and 1695, I calculate

  4. Early psychosocial intervention in Alzheimer's disease

    DEFF Research Database (Denmark)

    Søgaard, Rikke; Sørensen, Jan; Waldorff, Frans Boch

    2014-01-01

    OBJECTIVE: To assess the cost utility of early psychosocial intervention for patients with Alzheimer's disease and their primary caregivers. DESIGN: Cost utility evaluation alongside a multicentre, randomised controlled trial with 3 years of follow-up. SETTING: Primary care and memory clinics in ...

  5. Speech-Language Pathology: Preparing Early Interventionists

    Science.gov (United States)

    Prelock, Patricia A.; Deppe, Janet

    2015-01-01

    The purpose of this article is to explain the role of speech-language pathology in early intervention. The expected credentials of professionals in the field are described, and the current numbers of practitioners serving young children are identified. Several resource documents available from the American Speech-­Language Hearing Association are…

  6. Early Onset Charcot-Marie-Tooth Disease

    Directory of Open Access Journals (Sweden)

    J Gordon Millichap

    2005-06-01

    Full Text Available The clinical signs and genetic analysis of early-onset Charcot-Marie-Tooth disease (CMT in a 2-year-old boy and members of his family are reported from the Academic Medical Center, Amsterdam, and Sophia Children’s Hospital, Rotterdam, the Netherlands.

  7. Transcriptome Encyclopedia of Early Human Development.

    Science.gov (United States)

    Sahakyan, Anna; Plath, Kathrin

    2016-05-01

    Our understanding of human pre-implantation development is limited by the availability of human embryos and cannot completely rely on mouse studies. Petropoulos et al. now provide an extensive transcriptome analysis of a large number of human pre-implantation embryos at single-cell resolution, revealing previously unrecognized features unique to early human development.

  8. The Effect of Early Entrepreneurship Education

    DEFF Research Database (Denmark)

    Huber, Laura Rosendahl; Sloof, Randolph; Van Praag, Mirjam

    2014-01-01

    The aim of this study is to analyze the effectiveness of early entrepreneurship education. To this end, we conduct a randomized field experiment to evaluate a leading entrepreneurship education program that is taught worldwide in the final grade of primary school. We focus on pupils׳ development ...

  9. Early Identification of Ineffective Cooperative Learning Teams

    Science.gov (United States)

    Hsiung, C .M.; Luo, L. F.; Chung, H. C.

    2014-01-01

    Cooperative learning has many pedagogical benefits. However, if the cooperative learning teams become ineffective, these benefits are lost. Accordingly, this study developed a computer-aided assessment method for identifying ineffective teams at their early stage of dysfunction by using the Mahalanobis distance metric to examine the difference…

  10. Anti-early pregnancy by PDT

    Science.gov (United States)

    Ding, Ai-Hua; Chen, Hui-Ling

    1993-03-01

    The effect of laser on anti-early pregnancy in rabbits showed that laser in combination with HPD could induce necrosis of blastocysts and complete absorption. The anti-fertility efficiency of the combined treatment was more effective than that of the He-Ne laser or the HPD treatment alone. The fluorescence spectrum of HPD determined by PNQ3 showed that its affinity to embryonic tissue was about 4 times greater than that to uterine tissue. This may underlie the mechanisms of anti-early pregnancy of the laser. The operation of artificial abortion is a routine method to terminate early pregnancy. Though it is simple and easy, its syndrome and complications can not be absolutely avoided. Many antifertility drugs have been reported, however, they often bring in general reaction. Our present work is to explore a new way of anti-early pregnancy in rabbits by means of the light inhibitory and light sensitive effects of laser. It is a quite safe and painless treatment without expanding and scraping of the uterus.

  11. The role of semantics in early reading

    NARCIS (Netherlands)

    Gijsel, M.A.R.

    2007-01-01

    The aim of the dissertation was to obtain insight in semantic effects in word identification of Dutch children. Chapter 2 focused on the predictive value of risk factors, cognitive factors, and teachers' judgments in a sample of 462 kindergartners for their early reading skills in Grade 1. The discr

  12. A new perspective on early cosmology

    CERN Document Server

    Alesci, Emanuele

    2013-01-01

    We present a new perspective on early cosmology based on Loop Quantum Gravity. We use projected spinnetworks, coherent states and spinfoam techniques, to implement a quantum reduction of the full Kinematical Hilbert space of LQG, suitable to describe inhomogeneous cosmological models. Some preliminary results on the solutions of the Scalar constraint of the reduced theory are also presented.

  13. Stellar Relics from the Early Galaxy

    Indian Academy of Sciences (India)

    T. Sivarani

    2013-03-01

    We reviewed the recent progress in the field of stellar/galactic archeology, which is a study of the relics from the early galaxy. The oldest and most pristine objects that can be observed in the galaxy are the low mass metal poor stars of the Milky Way. They were formed during the early phases, when the ISM might have been polluted only by the Pop-III supernovae. With the recent large spectroscopic surveys (e.g. HK survey by Beers and collaborators, the Hamburg-ESO survey by Christlieb and collaborators and Sloan Digital Sky Survey) it has been possible to get clues on the nature of the first stars that has contributed to the heavy elements. Most of these metal-poor low mass stars also retain their signature of the early dynamical evolution of the galaxy, which can be studied through their orbits around the galaxy and spatial distribution. Here, we discuss the connection between the chemical and the kinematical properties of metal-poor stars in order to probe the early galaxy formation. We also discuss about the globular clusters, the satellite galaxies around the Milky Way and its possible contribution to the formation of the galaxy halo.

  14. Practitioner Review: Early Adversity and Developmental Disorders

    Science.gov (United States)

    Taylor, Eric; Rogers, Jody Warner

    2005-01-01

    Background: Knowledge of genetic influences, on developmental disorders such as autism spectrum, attention deficit/hyperactivity disorder and learning disabilities, has increased the opportunities for understanding the influences of the early environment. Methods: This paper provides a selective, narrative review for clinicians of the effects of…

  15. Impact Factor: Early Career Research & Digital Scholarship

    Science.gov (United States)

    Pasquini, Laura A.; Wakefield, Jenny S.; Roman, Tiffany

    2014-01-01

    It is becoming increasingly vital to publish and share research as well as get citations for the purpose of researcher visibility. The publishing options available for research distribution seem endless. It really is an academic jungle out there! This article reviews why early career researchers and graduate scholars should consider their research…

  16. American Sign Language and Early Intervention

    Science.gov (United States)

    Snoddon, Kristin

    2008-01-01

    Since the beginning of the twenty-first century, the introduction in several countries of universal neonatal hearing screening programs has changed the landscape of education for deaf children. Due to the increasing provision of early intervention services for children identified with hearing loss, public education for deaf children often starts…

  17. Honoring Diversity in Early Childhood Education Materials.

    Science.gov (United States)

    Corso, Robert M.; Santos, Rosa Milagros; Roof, Virginia

    2002-01-01

    This article summarizes guidelines developed by the Culturally and Linguistically Appropriate Services Early Childhood Research Institute for selecting and adapting materials for young children and their families. Recommendations are provided that community teams should consider in collecting, selecting, and reflecting on materials. Tips are also…

  18. Luncheon address: Early days of CANDU fuel

    Energy Technology Data Exchange (ETDEWEB)

    Page, R.D. [Atomic Energy of Canada Limited (Canada)

    1997-07-01

    This will briefly describe how the original dimensions of the fuel bundle were defined and how that early designs of fuel evolved. I will also touch on some of the historical events of the materials and experiments which effected the fuel programme. Also how I became with Canada's Nuclear Fuel programme. (author)

  19. Early word recognition and later language skill

    NARCIS (Netherlands)

    Junge, Caroline; Cutler, Anne

    2014-01-01

    Recent behavioral and electrophysiological evidence has highlighted the long-term importance for language skills of an early ability to recognize words in continuous speech. We here present further tests of this long-term link in the form of follow-up studies conducted with two (separate) groups of

  20. Multiple early gastric cancer with duodenal invasion

    Directory of Open Access Journals (Sweden)

    Okino Tetsuya

    2007-10-01

    Full Text Available Abstract Background Early gastric cancers with duodenal invasion are rare, and no previous case of multiple early gastric cancer, one invading the duodenal bulb, has been reported. Case presentation A 79-year-old woman was investigated for upper abdominal discomfort. Endoscopic examination revealed an irregular nodulated lesion in the antrum area, and a reddish aggregated-type semi-circumferential nodulated lesion extending from the prepyloric area to the duodenal bulb through the normal mucosa with the antrum lesion. Biopsy revealed a tubular adenoma for the antrum lesion and a well-differentiated tubular adenocarcinoma for the prepyloric lesion. Distal gastrectomy with sufficient duodenal resection was performed. Microscopically, the antrum lesion appeared as a papillary adenocarcinoma, and the prepyloric lesion as a mainly papillary adenocarcinoma which partially invaded the submucosa without any sequential elongation for endoscopic findings. The lesion extended into the duodenal bulb, and was 12 mm in length from the oral end of Brunner's gland's area and limited within the duodenal mucosa. Conclusion Here, we present an unusual case of multiple early gastric cancer, one of which invaded the duodenum with relative wide mucosal spreading. This case illustrates that even early stage cancers located in the gastric antrum, particularly in the prepyloric area can invade the duodenum directly.