1,720,960 research outputs found
Nitrous oxide in blood and urine of operating theatre personnel and the general population
No full textNitrous oxide (N-2O) was assayed in 676 urine samples and 101 blood samples provided after exposure by operating theatre personnel from nine hospitals. The blood and urine assays were repeated in 25 subjects 18 h after the end of exposure. For 80 subjects, environmental N-2O was also measured during intraoperative exposure. Mean urinary N-2O in the 676 subjects at the end of exposure was 40 mu-g/l (range 1-3805 mu-g/l); in 10 of the 676 subjects, urinary N-2O was in the range 279-3805 mu-g/l (mean 1202 mu-g/l). The 98th percentile was 120 mu-g/l. Mean blood N-2O at the end of exposure, measured in 101 subjects, was 21 mu-g/l (median 16 mu-g/l, range 1-75 mu-g/L). Blood and urine N-2O (1.5 mu-g/l and 4.9 mu-g/l, respectively) in 25 subjects, 18 h after exposure, was significantly higher than in occupationally non-exposed subjects (blood 0.91 mu-g/l, urine 1 mu-g/l). Environmental exposure was significantly related to blood and urinary N-2O (r = 0.59 and r = 0.64, respectively). Blood and urinary N-2O were significantly related to each other (r = 0.71), and were equivalent to about 25% of the environmental exposure level. The mean urinary N-2O of 1202 mu-g/l in 10/676 subjects was not related to environmental exposure in the operating theatre. The highest urinary N-2O levels measured in these 10/676 subjects could be explained by an asymptomatic urinary infection
Comparison of breath, blood and urine in biomonitoring of environmental exposure to 1,3-butadiene, 2,5-dimethylfuran and benzene.
No full textIl monitoraggio biologico del cobalto quale metodo di misura per esposizioni professionali ed ambientali dicirca 4 mesi
No full textDati sulla cinetica del Co nel sangue in un gruppo di 32 lavoratori esposti attraverso il monitoraggio per 16 settimane consecutive degli addotti del cobalto alla globin
Sexual reproduction and biometry of the nonzooxanthellate papillose cup coral Paracyathus pulchellus
Full text linkBasic information on the reproductive biology of many scleractinian corals
species is limited or entirely lacking, particularly from temperate zones, though
it is essential for a better understanding of their ecology. This study describes
the morphological aspects and the annual cycle of gametogenesis and
biometric parameters of the papillose cup coral Paracyathus pulchellus
collected at Palinuro (Italy, Southern Tyrrhenian Sea), filling a knowledge gap
about the reproductive biology of a widespread Mediterranean and Northern
Atlantic coral. Samples of P. pulchellus were collected by SCUBA diving
between 5- and 10-meters depth during 18 monthly collections from June
2010 to December 2011. Sexually active polyps displayed either oocytes or
spermaries, indicating that P. pulchellus was gonochoric. The sex ratio of
sexually active polyps was 1:1. Gametogenesis began with undifferentiated
germ cells arose in the gastrodermis that migrated towards the mesoglea of the
mesentery where they completed the development. During spermatogenesis,
spermary diameter increased from 25 to 83 μm. Oocyte diameter ranged from
9 to 146 μm and during oogenesis the nucleus/cytoplasm ratio decreased due
to the accumulation of yolk. The nucleus migrated to the periphery of the
oocyte adhering closely to the cell membrane. No embryo was observed in the
coelenteric cavity of the polyps, suggesting an external development of
planktotrophic larvae due to the small-sized mature oocytes and a possible
broadcast spawning reproductive mode. Gonadal index of both females and
males increased significantly from August until November and fertilization took
place from November to January. Only sexually inactive individuals were
observed from February to April, suggesting a quiescence period in both
males and females. Seasonal variations in water temperature and
photoperiod may have a key role in regulating gametogenesis. The analysis
of the main biometric parameters (polyp width, height, dry skeletal mass, volume, surface/volume ratio and bulk skeletal density) showed a negative
correlation between size and skeletal density, and no sexual dimorphism
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Blood toluene as a biological index of environmental toluene exposure in the "normal" population and in occupationally exposed workers immediately after exposure and 16 hours later.
No full textBlood toluene was measured in a group of 100 workers occupationally exposed to a mean 8-h environmental toluene concentration of 128 mu g/1 (34 ppm), and in a group of 269 ''normal'' subjects without occupational exposure to toluene. The mean blood toluene of the workers at the end of the shift and the following morning, after 16 h, was 457 and 38 mu g/1, respectively, The normal subjects had a blood toluene level of 1.1 mu g/1. On the basis of the highly significant correlation between blood toluene and occupational exposure, it can be calculated that environmental toluene exposure of 188 and 377 mu g/1 (50 and 100 ppm) gives end-of-shift blood toluene levels of 690 and 1390 mu g/1, respectively. The corresponding blood toluene levels on the following morning are 50 and 100 mu g/1, respectively
Reproductive morphology and biometry of the non-zooxanthellate papillose cup coral Paracyathus pulchellus (Scleractinia: Caryophylliidae)
No full textBasic information on the reproductive biology of many scleractinian corals species is limited or entirely lacking, particularly from temperate zones, though it is essential for a better understanding of their ecology. This study describes the morphological aspects of gametogenesis and biometric parameters of the papillose cup coral Paracyathus pulchellus collected at Palinuro (Italy, Southern Tyrrhenian Sea), filling a knowledge gap about the reproductive biology and growth of a widespread Mediterranean and Northern Atlantic coral, which is currently labelled as Data Deficient by IUCN. Samples of P. pulchellus were collected by SCUBA diving between 5- and 10-meters depth during 18 monthly collections from June 2010 to December 2011. Polyps have been analyzed through histological techniques. All 57 polyps displayed either oocytes or spermaries, indicating that P. pulchellus was gonochoric. Gametogenesis began with undifferentiated germ cells arose in the gastrodermis that migrated towards the mesoglea of the mesentery where they completed the development. During spermatogenesis, spermary diameter increased from 25 to 83 μm. Oocyte diameter ranged from 9 to 146 μm and during oogenesis the nucleus/cytoplasm ratio decreased due to the accumulation of yolk. The nucleus migrated to the periphery of the oocyte adhering closely to the cell membrane. No embryo was observed in the coelenteric cavity of the polyps, suggesting a broadcast spawning reproductive mode with a possible planktotrophic larval development due to the small-sized mature oocytes. The analysis of the main biometric parameters (polyp width, height, dry skeletal mass, volume, surface/volume ratio and bulk skeletal density) showed a negative correlation between size and skeletal density, and no sexual dimorphism
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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