1,720,957 research outputs found
CORRECTING EFFECT OF AQUEOUS EXTRACT FROM DUCKWEED LEMNA MINORFROND ON MORPHOLOGICAL STATE OF THYROID GLAND IN RATS WITH HYPOTHYROIDISM
Full text linkThe present work studied the effect of aqueous extract from duckweed Lemna minor frond on morphological state of the thyroid gland in the experimental hypothyroidism. Healthy albino rats weighing between 120 g and 150 g were used. The animalswere randomly allotted into four groups, each containing ten rats respectively. Three of the groups (II, III and IV) induced with hypothyroidism by 1 % solution of sodium perchlorate with drinking water for 20 days. Control (vehicle) rats were given normal saline. After 20 days hypothyroid groups (III and IV) of rats treated with aqueous extract from duckweed Lemna minor frond at a dose 0.5 ml/100 g of body weight and with Iodomarin 200 (reference drug) at a dose 12 µg/kg daily orally for 21 days. Results obtained from the study showed that the introduction of sodium perchlorate leads to morphological and functional changes in the structure of the thyroid gland in rats, accompanied by sings of hyperplastic tissue proliferation and corresponds with hypofunctional state. It was established that introduction of aqueous extract from duckweed Lemna minor frond has a positive effect on the restructuring of the thyroid gland in rats with hypothyroidism, increasing its functional activity. There is a decrease of proliferative processes by extrafolliсular epithelium and thyrocytes in the follicles. The outer diameter of follicles decreased by 7.65 % (P>0.05), the height and size of thyrocytes in the wall of the follicle were significantly decreased by 58.16 % and 18 41 %, respectively, compared to untreated hypothyroid group. The obtained results have practical significance for the development of drugs with thyroid-stimulating action for preventing or delaying the development of hypothyroidism and its complications
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
Вміст макро- та мікроелементів у щурів при експериментальному автоімунному тиреоїдиті та за дії ряски малої
Full text linkThe aim was to study the effect of aqueous extract and 30 % alcohol tincture of Lemna minor frond (AELM and TLM) on the content of macro- and microelements in rats with experimental autoimmune thyroiditis.
Materials and methods. The effect of AELM and TLM was studied in a model of experimental autoimmune thyroiditis in rats, induced by immunization with human thyroid antigen. The serum levels of total thyroxine, total triiodothyronine, antibodies to thyroglobulin, antibodies to thyroperoxidase, and concentrations of macro- and microelements were studied.
Results. The development of experimental autoimmune thyroiditis led to a decrease in the content of total thyroxine and antibodies to thyroperoxidase in the blood serum, an increase in the content of antibodies to thyroglobulin and a decrease in the concentrations of sodium, chlorine, potassium phosphorus, zinc, copper, iron and magnesium. It was found that the use of AELM and TLM against the background of autoimmune thyroiditis led to the restoration of T4 and elemental balance in rats, which was manifested in an increase in the content of sodium, chlorine, phosphorus, magnesium, zinc, iron, copper and calcium in the blood serum. It was also shown that TLM had a more powerful effect on the normalisation of the content of such elements as chlorine, potassium, copper and zinc. The obtained effect of AELM and TLM on the content of macro- and microelements in the blood serum of animals with experimental AIT can be explained by their positive effect on the functional activity of the thyroid gland. The studied extract and tincture may also affect other physiological and biochemical processes due to the content of macro- and microelements and other biologically active substances, which requires further research.
Conclusions. Administration of AELM and TLM to rats with experimental AIT contributed to lowering the level of Anti-TG and restoring the thyroid and elemental status in the animals' blood serum. The obtained research data allow us to recommend AELM and TLM as a regulator of the elemental status of the body in case of changes in thyroid functionМета – вивчення впливу водного екстракту та 30 % спиртової настойки листеця ряски малої (ВЕЛР та НЛР) на вміст макро- та мікроелементів у щурів з експериментальним автоімунним тиреоїдитом.
Матеріали та методи. Дослідження впливу ВЕЛР і НЛР проводили на моделі експериментального автоімунного тиреоїдиту у щурів, індукованого імунізацією антигеном щитоподібної залози людини. В сироватці крові досліджували вміст загального тироксину, загального трийодтироніну, антитіл до тиреоглобуліну, антитіл до тиреопероксидази та концентрації макро- та мікроелементів.
Результати. Розвиток експериментального автоімунного тиреоїдиту призводив до зниження вмісту у сироватці крові загального тироксину та антитіл до тиреопероксидази, підвищенню вмісту антитіл до тиреоглобуліну та зниженню концентрацій натрію, хлору, калію фосфору, цинку, міді, заліза та магнію. Встановлено, що застосування ВЕЛР і НЛР на тлі автоімунного тиреоїдиту призводило до відновлення Т4 та елементного балансу у щурів, що проявлялося у підвищенні вмісту натрію, хлору, фосфору, магнію, цинку, заліза, міді та кальцію у сироватці крові. Також, показано, що НЛР мала більш потужний вплив щодо нормалізації вмісту таких елементів, як хлор, калій, мідь та цинк. Отриманий ефект ВЕЛР і НЛР на вміст макро- та мікроелементів у сироватці крові тварин з експериментальним АІТ можна пояснити їх позитивним впливом на функціональну активність ЩЗ. Можливо досліджувані екстракт і настойка впливають й на інші фізіологічні та біохімічні процеси за рахунок вмісту в них макро- та мікроелементів та інших біологічно активних речовин, що потребує подальших досліджень.
Висновки. Введення ВЕЛР і НЛР щурам з експериментальним АІТ сприяло зниженню рівня АТ ТГ і відновленню тиреоїдного та елементного статусу у сироватці крові тварин. Отримані дані досліджень дозволяють рекомендувати ВЕЛР і НЛР в якості регуляторів елементного статусу організму при змінах функції Щ
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
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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