1,720,986 research outputs found
Genotypic Variation in Tolerance to Boron Toxicity in 70 Durum Wheat Genotypes
No full textBy using 70 durum wheat (Triticum durum) genotypes, a greenhouse experiment has been carried out to study genotypic variation in tolerance to boron (B) toxicity in soil. Plants were grown in a soil containing 12 mg extractable B kg-1 soil and treated additionally with (+B: 25 mg kg-1 soil) and without B (-B: 0 mg B kg-1 soil). Following 30 days of growth, only shoots have been harvested and analyzed for dry matter production and shoot concentrations of B. There was a large genotypic variation in tolerance to B toxicity based on the severity of leaf symptoms and decreases in dry matter production caused by B toxicity. Among the genotypes tested, the growth of the genotypes Sabil-1, Stn “S”, Aconhi-89 and Wadelmez-2 was not affected; even, there was a tendency for an increase in growth by B treatment. By contrast, the dry matter production of all other genotypes was markedly decreased by the applied B, particularly in the genotypes Lagost-3, Dicle-74, Brachoua/134xS-61 and Gerbrach. In case of the genotypes Brachoua/134xS-61 and Gerbrach, B application reduced dry weight of the plants by 2-fold. Interestingly, there was no relationship between shoot B concentrations and relative decreases in shoot dry weight by B toxicity. The most B-sensitive genotypes had generally much lower amount of B in shoot than the genotypes showing higher tolerance to B toxicity. This result indicates that the B-exclusion mechanism is not involved in differential expression of B tolerance within 70 durum wheat genotypes. It seems very
likely that the internal mechanisms (e.g., adsorption to cell walls and compartementation of B in vacuoles) could be a more plausible explanation for B tolerance in the durum wheats tested in the present study
DETERMINATION OF MINERAL NUTRITINAL STATUS OF POTATO GROWING REGIONS IN MİSLİ AND ÇUKUROVA PLAIN BY TUBER AND SOIL ANALYSIS
No full textPatates buğday, çeltik ve mısırdan sonra insanlar tarafından en çok tüketilen bir besin kaynağıdır. Patatesin içerdiği karbonhidrat, protein, mineral maddeler ve vitaminler insan beslenmesinde vazgeçilmez niteliktedir. Bu nedenle son yıllarda patatesin verimini arttırmak için aşırı özellikle azotlu gübre kullanılmaktadır. Aşırı N’lu gübre kullanılması patatesin kalitesi ve yumrunun mineral element içeriğini
olumsuzlaştıracağı ve hasatlıklara karşı direncini düşüreceği beklenmektedir. Bu nedenle Türkiye’de patates yetiştiriciliğinin yapıldığı Misli ovasından ve Çukurova bölgesinden yumru ve toprak örneklerinin alınarak element konsantrasyonlarının belirlenmesi patatesin kalite özelliklerinin saptanması açısından
oldukça önemlidir. Bu amaç için Misli ovasından 140 toprak (0-30 cm) ve 138 patates yumrusu, Çukurova bölgesinde ise 86 toprak (0-30 m) ve patates yumru örneği toplanmıştır. Misli ovasından alınan yumru örneklerinde, örneklerin % 65’nin yüksek N’lu olduğu, Çukurova’da ise aynı değerin % 95 olduğu bulunmuştur. Her iki bölgedeki yumruların ayrıca % 64-65 oranında yüksek P konsantrasyonuna sahip olduğu belirlenmiştir. Bu değerlere karşılık, Misli ovasındaki yumruların % 68.6’nın Ca’ca, % 49.3’ünün K’ca ve % 41.4’ünün de Mg’ca yetersiz düzeyde beslendiği saptanmıştır. Çukurova bölgesinde ise söz konusu elementlerin patateslerde özellikle Ca ve K beslenmesiyle ile ilgili önemli bir sorunun olmadığı görülmüştür. Sonuç olarak, Misli ovasında K, Ca ve Mg beslenme yetersizliğinin giderilmesi için bu elementlerin gübrelenmesine önem verilmelidir. Ayrıca aşırı N ve P gübre kullanımından kaçınılmalıdır. Her iki bölge için iklim, toprak ve bitki isteklerini dikkate alan bir gübreleme programına gereksinim vardır
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
RESPONSES OF SOME FRAGARIA CHILOENSIS GENOTYPES TO THE VARIOUS SALT (NaCl) CONCENTRATIONS DURING IN VITRO PROPAGATION
No full textKültür çileği (Fragaria ×ananassa) Güney (F. chiloensis) ve Kuzey Amerika’dan (F. virginiana) iki ayrı türün doğal melezlemesiyle ortaya çıkmıştır. Genellikle ebeveyn türler kültür çileğine oranla daha geniş bir çeşitlilik göstermektedirler. Kültür çileği tuza hassas bitkiler arasında yer almaktayken, ebeveyn türlerden F. chiloensis’in tuza tepkisi daha önce bilinmemektedir. Bu nedenle tuza dayanıklı çilek genotiplerinin elde edilmesinde bu yabani türün tuza dayanıklılığının test edilmesi önem taşımaktadır. Bu çalışmada çilek çekirdek koleksiyonundan dört F. chiloensis’in (2 TAB 4B, CFRA 1267, HM1 ve Scotts Creek) in vitro koşullarda değişik NaCl konsantrasyonlarına (0, 25, 50, 75 ve 100 mM) tepkileri araştırılmıştır. 45 günlük deneme sonucunda çoğaltma katsayısı ve kuru ağırlık ile birlikte bazı besin elementlerinin (K, Ca, Mg, Na) bitkilerdeki konsantrasyonları belirlenmiştir. Deneme sonuçları, yüksek tuz konsantrasyonunun çoğaltma katsayısını azalttığı, kuru ağırlık, Ca, Na konsantrasyonlarını da etkilediği tespit edilmiştir. En yüksek bitki Na konsantrasyonları 75 ve 100 μM NaCl uygulamalarından, en yüksek Ca konsantrasyonu ise 0 ve 25 mM NaCl uygulamalarından elde edilmiştir. Genotiplerin kuru ağırlıklarında, K/Na ve Ca/Na oranlarında genelde NaCl konsantrasyonundaki artışa bağlı olarak bir azalma gözlemlense de, bu azalma en düşük olarak da HM1 genotipinde kaydedilmiştir. Denemede elde edilen sonuçlar doku kültürü yoluyla çilek genotiplerinin yüksek NaCl konsantrasyonlarına tepkilerinin, hızlı ve etkili bir şekilde belirlenebileceğini göstermektedir
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
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