1,720,957 research outputs found
Influence of a broad temperature range on the oxygen consumption rates of three desert lizard species.
No full text1. Oxygen consumption rates of three desert lizard species: (Acanthodactylus boskianus, Lacertidae; Scincus mitranus, Scincidae; Diplometopon zarudnyi, Amphisbaenidae) were determined in relation to ambient temperatures ranging from 10 to 35°C using a double-chamber, volumetric closed system.
2. 2. The interspecific differences in the oxygen consumption rates were found to have a close relationship between the characteristics of the M-T curves, the thermoregulatory behaviour and the ecology of the respective species.
3. 3. The M-T curves of the studied lizards were specifically modified and adjusted to their climatic region
Reproductive biology of the horned viper, Cerastes cerastes gasperettii in the central region of Saudi Arabia
No full textAbstractThe reproductive biology of the horned viper, Cerastes cerastes gasperettii, in Riyadh region of Saudi Arabia was investigated over a period of one year. Study of reproductive cycle of male and female C. c. gasperettii revealed that the breeding season is relatively short (April and May). Thereafter females laid eggs by mid of July and hatching probably had taken place by the end of September. No activity was observed during winter, this may indicate just a single clutch per year. Relative testis weight to body weight was drastically increased (X¯=0.88%) during the peak of reproductive activity (May) where maximal expansion of seminiferous tubules was also attained during April and May (X¯=209μm and 191μm, respectively). Likewise, the ovarian activity was the highest during May where ovarian parameters were greater in terms of relative ovarian weight to body weight and ova diameter being 0.46% and 2.29mm, respectively. Fat body weight was increased drastically just before the peak of reproductive activity then started to decline during June. It could be concluded that the harsh desert conditions and similar environments certainly affect reproductive activity of Saudi Arabian reptiles including snakes
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
The effects of walterinnesia aegyptia venom on the serum and tissue metabolites and on some enzyme activities in albino rats. III-effect on lipid metabolism and two dehydrogenases
No full textAn LD 50 (0.2 mglkg) dose of Walterinnesia aegyptia venom to albino rats causes a significant decrease in total serum lipids, triacylglycerols and total cholseterol, with a decline in both glucose-6-phosphate dehydrogenase (G6PDH) and lactate dehydrogenase (LDH) activities, possibly due to lipolytic and specific inhibitors present in the venom. Accumulation of totallipids was observed in the liver, kidneys, heart and brain of envenomated animals with a subsequent insignificant decrease in total cholesterol and triacylglycerols, except in the liver, where the decrease was significant. This suggests mobilization of lipids from peripheral tissues to these organs accompanied by release of other components of totallipids such as phospholipids and fatty acids. Deficiency in the pentose phosphate pathway (PPP) , disturbance in the oxidoreduction system and altered energy metabolism were also detected. Variations in enzyme activities were also seen with the G6PDH level which generally elevated in the all organs studied, except in brain. The level of LDH declined in liver and kidney, but increased in heart and brain. This may suggest prevalence of anaerobic conditions in such organs as a result of venom detoxication.Corresponding Author:
Dr.Ibrahim A. A. Al-Jammaz, Professor, Department of Biology, College Of Teaching, King Saud University, PO Box 4341, Riyadh 11491, Saudi Arabia. Email: [email protected]
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