1,720,977 research outputs found
İç Anadolu'da tarımsal ormancılık ve tarımsal ekosistem gelişim potansiyeli olan, elaeagnaceae'de bir aktinorizal bitki olan Elaeagnus angustifolia için doğrudan kuruluş yöntemlerinin değerlendirilmesi
No full textElaeagnus angustifolia L. gibi aktinorizal bitkiler, geniş tarımsal ormancılık ve tarımsal ekosistem faydaları sağlar. Ancak, İç Anadolu'nun Niğde ilinde doğal yerleşme yaygın olarak gözlenmemiştir. Bu çalışma, E. angustifolia için doğrudan yerleşme yöntemlerini değerlendirmeyi amaçlamıştır. Niğde toprağında Frankia dağılımına ek olarak ekim derinliği, su rejimleri, dolgu derinliği, hidrofilik jel ve toprak dolgu türlerinin etkilerini değerlendirmek için serada ve tarlada altı deneme yapılmıştır. Sulama rejimi ve ekim derinliği, E. angustifolia çıkışını, kök ve sürgün uzunluğunu ve çimlenme oranını etkilemiştir. Dolgu tipi, dolgu miktarı ve ekim derinliği de çıkış ve çimlenme oranını etkilemiştir. Hidrofilik jel dolgu, E. angustifolia'nın çimlenme oranını arttırmış ve 25 mm ekim derinliği daha yüksek çıkış ve bitki büyümesi sağlamıştır. Frankia'nın çalışma alanı boyunca dağılım gçsterdiği bulunmuştur. Tarla koşullarında E. angustifolia'nın kış çimlenmesi düşük olurken, karık uygulaması E. angustifolia'nın çimlenmesini arttırmıştır. Genel olarak, üniversite kampüsü ve çevresinden toplanan E. angustifolia aksesyonları ticari türe göre daha yüksek çimlenme ve büyüme göstermiştir. Anahtar Sözcükler: Elaeagnus angustifolia L., Frankia, Çimlenme, Dolgu, Hidrofilik jelActinorhizal plants such as Elaeagnus angustifolia L. provide vast agroforestry and agroecosystem benefits. However, in Niğde Province, Central Anatolia, natural establishment has not been widely observed. This study aimed at assessing direct establishment methods for E. angustifolia. Six experiments were conducted in greenhouse and on the field to evaluate effects of sowing depth, water regimes, backfilling (of the planting hole) depth, hydrophilic gel and soil backfilling types in addition to Frankia distribution in Niğde soil. Water regime and sowing depth affected the E. angustifolia emergence, root and shoot length and germination rate. The backfilling type, fill quantity and sowing depth also affected the emergence and germination ratio. Hydrophilic gel backfilling enhanced the germination ratios of E. angustifolia and 25 mm sowing depth gave higher emergence and plant growth. Frankia was found to be distributed across the study site. Winter germination of E. angustifolia was low while the furrow application enhanced E. angustifolia germination under field conditions. Generally, accessions of the E. angustifolia collected in and around the university campus had higher germination and growth compared with the commercial type. Keywords: Elaeagnus angustifolia L., Frankia, Germination, Backfill, Hydrophilic ge
Hippophae rhamnoides'in Çamardı, Orta Anadolu, Türkiye'deki yabani populasyonunun karakterizasyonu
Full text linkFen Bilimleri Enstitüsü, Bitkisel Üretim ve Teknolojileri Ana Bilim DalıHalk arasında yalancı iğde olarak adlandırılan Hippohae rhamnoides, ılıman bölge çalısı olup, olumsuz çevre koşullarına dayanıklıdır ve önemli yabani yenilebilir meyvelerden biridir. Bu çalışmada, H. rhamnoides'in Orta Anadolu, Çamardı'daki en güneydeki yabani popülasyonu kullanılarak etnobotanik inceleme ve morfolojik karakterizasyon yapılmıştır. Etnobotanik çalışma, Çamardı'da yaşayan yaşlı nüfus ile yarı yapılandırılmış görüşme şeklinde gerçekleştirilmiş ve bitki halk tarafından daha çok "Karaçalı" olarak adlandırılmıştır. H. rhamnoides'in morfolojik karakterizasyonu için ImageJ görüntü işleme yazılım programı kullanılmıştır. Sonuçlar, Çamardı'dan örneklenen 18 katılımın ağaç analizinde genel olarak klonal bir yapı sergilendiğini göstermiştir. Meyve analizlerinde sahalar arası en büyük farklılık AR parametresinde 1.30 -1.85 aralığında iken, tohum analizlerinde ise 1.71-2.15 olarak bulunmuştur. Sınırlı sayıdaki verilerden elde edilen sonuçlar gelecekte daha fazla katılım dikkate alınarak değerlendirildiğinde, ülke ekonomisine daha faydalı olacaktır. Anahtar Kelimeler: Hippohae rhamnoides, yabani popülasyon, etnobotanik, morfolojik karakterizayon, ImageJHippohae rhamnoides commonly named as sea buckthorn, is a temperate bushes and and resistant to adverse environmental conditions. It is one of the important wild edible fruits that naturally grown in some part of the Turkey. In this stuıdy, ethnobotanical investigation and morphological characterzation were done with using the most southerly wild population of H. rhamnoides in Çamardı, Central Anatolia, Turkey. The ethnobotanical study was conducted in the form of a semi-structured interview with the elderly population living in Çamardı and the plant was mostly called as "Karaçalı" by the people. In order to morphological characterization of H. rhamnoides image processing software program ImageJ was used. Results showed that, tree analysis of 18 accessions sampled from Çamardı generally exhibited a clonal structure. In fruit analysis, the greatest variation among sites was in the AR parameter in the range of 1.30 -1.85 while in seed analysis it was 1.71-2.64. The results obtained from a limited number of data are evaluated by considering more genotypes in the future, has the potential to provide even greater benefits to the economy of the country. Keywords: Hippohae rhamnoides, wild population, ethnobotany, morphologic characterization, Image
Kuş iğdesi(Eleagnus angustifolia) ve yalancı iğde'nin (Hippophae.rhamnoides) tohum biyolojisi, toprak tohum bankasi ve doğal olarak yetiştirilmesi üzerine çalışmalar
Full text linkFen Bilimleri Enstitüsü, Bitkisel Üretim ve Teknolojileri Ana Bilim DalıBu çalışma, Elaeagnus angustifolia ve Hippophae rhamnoides tohum bankalarını değerlendirmektedir. Ayrıca, E. angustifolia ve H. rhamnoides doğal alımını etkileyen koşulların ve her iki türün çimlenmesi için minimum büyüme sıcaklığının değerlendirilmesi yapılmıştır. E. angustifolia tohumları Niğde Ömer Halisdemir Üniversitesi, Niğde, Türkiye'den, H. rhamnoides tohumları Niğde, Çamardı'dan toplanmıştır. E. angustifolia meyve karakterizasyonu, meyve ve endokarp uzunluk, çap ve ağırlığının ağaca ve bölgeye göre değiştiğini göstermiştir. E. angustifolia verileri, bitki atık örneklerinin toprak örnekleriyle karşılaştırıldığında daha fazla tohum içerdiğini göstermiştir. Doğal tohum bankalarının sulanmasından elde edilen sonuçlar, sulanan ağaçların tüm lokasyonlardaki tüm ağaçlarda en yüksek çimlenme oranına sahip olduğunu göstermiştir. Her iki tür için de minimum çimlenme sıcaklığı 15°C'de başlamış ve bu sıcaklık aralığının altında tohum çimlenmemiştir. Ekim derinlikleri kullanılarak sulu ve susuz koşullarda simüle edilen tohum bankası verileri, en yüksek çimlenme oranını 20 mm ekim derinliğinde, en düşük çimlenme oranını ise 30 mm ekim derinliğinde gözlemlemiştir. Anahtar Kelimeler: Tohum Bankaları, Biyoloji, Agroecosystems, Elaeagnus angustifolia, Hippophae rhamnoideThis study aimed to assessed the size and viability of Elaeagnus angustifolia and Hippophae rhamnoides seed banks. Also, the evaluation of conditions that affect natural recruitment of E. angustifolia and H. rhamnoides was done and minimum growth temperature for germination of both these species. Seeds for E. angustifolia were collected from the Nigde Omer Halisdemir University, Nigde, Türkiye, while seed for H. rhamnoides, from Çamardı, Nigde. The fruit characterization of E. angustifolia showed that the length, diameter and weight of the fruit and endocarp varied according to tree and site. Data for E. angustifolia showed that litter samples contain more seeds as compared to soil samples. Results obtained from watering of natural seed banks showed that watered trees had the highest rate of germination in all trees at all locations. The minimum germination temperature for both species was started at 15°C and below this range of temperature no seed germinated. Data for simulated seed bank in underwatered and unwatered conditions by using sowing depths showed highest rate of germination at 20 mm sowing depth and the lowest germination rate was observed at 30 mm sowing depth. Keywords: Seed Banks, Biology, Agroecosystems, Elaeagnus angustifolia, Hippophae rhamnoide
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
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
Extinction by citation deficiency: are botany journals at risk?
Full text linkPurpose With the current dynamics of scientific publishing increasingly driven by citation metrics, it is quite possible this will lead to the loss of some lower-ranked journals as they will be undervalued by authors, research institutions and research funders. This has been specifically predicted for natural science journals, but the efforts of editors of such journals to improve reputation have not been quantitatively assessed. This research aimed to fill this knowledge gap and assess the potential vulnerability of lower-ranked botany journals. Design/methodology/approach Changes in article citation rates since 2009 for 21 lower-ranked general botany journals were examined by least squares linear regression and factors potentially predictive of higher citation potential by principal component analysis. The findings were then examined in a case study of the publishing that followed the celebrated discovery of a living-fossil plant (Wollemia nobilis) in the mid-1990s. Findings Article citation rates steadily declined across most of these 21 journals over the period, and if submissions had been favoured (directly or indirectly) for citation potential, this appears to have been an ineffective, perhaps even a flawed, endeavour. Analysis of quantifiable article attributes across a subset of these journals revealed inconsistent relationships with no predictive value for citation potential. The case study clearly highlighted some processes contributing to declining citation rates and the value of botanical reporting well beyond that indicated by citation metrics. Research limitations/implications It is not possible to know how important prediction of citation potential (directly or indirectly) is when journal editors accept papers for review or publication (such information is not made public, and this might not be a formalised process), so this study is only based what is considered (by the author) to be a reasonable assumption that all journals aim to improve their reputation and use citation metrics as one determinant of this. Social implications Unless we give value to lower-ranked regional botany journals in other ways than citations, the current trends in citation rates could lead to the diminution, even loss, of their valuable contribution biodiversity conservation. Originality/value Although concerns have been expressed about the long-term viability of natural history journals, this is the first research to examine this quantitatively using citation metrics
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
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