Some Computational Problems Related to Pseudo-intents

We investigate the computational complexity of several decision, enumeration and counting problems related to pseudo-intents. We show that given a formal context and a set of its pseudo-intents, checking whether this context has an additional pseudo-intent is in conp and it is at least as hard as checking whether a given simple hypergraph is saturated. We also show that recognizing the set of pseudo-intents is also in conp and it is at least as hard as checking whether a given hypergraph is the transversal hypergraph of another given hypergraph. Moreover, we show that if any of these two problems turns out to be conp-hard, then unless p = np, pseudo-intents cannot be enumerated in output polynomial time. We also investigate the complexity of finding subsets of a given Duquenne-Guigues Base from which a given implication follows. We show that checking the existence of such a subset within a specified cardinality bound is np-complete, and counting all such minimal subsets is #p-complete

Formal Concept Analysis Methods for Description Logics

This work presents mainly two contributions to Description Logics (DLs) research by means of Formal Concept Analysis (FCA) methods: supporting bottom-up construction of DL knowledge bases, and completing DL knowledge bases. Its contribution to FCA research is on the computational complexity of computing generators of closed sets

Detection of Pear Vein Yellows Disease caused by Apple stem pitting virus (ASPV) in Hatay province of Turkey

Pear vein yellows disease (PVYD) caused by Apple stem pitting virus (ASPV) was studied in 9 pear orchards and 3 nurseries in Hatay province of Turkey. A survey was carried out to inspect the symptoms of PVYD on pear (Pyrus communis). Leaf symptoms consist of yellow vein banding, reddening and flecking along the veins that were observed during the late spring to winter (dropping leaves). ApMv, ACLSV which are important viruses of pome fruits were also investigated on pear orchards and several quince (Pyrus cydonia) trees in pear orchards. The shoot and leaf samples were taken randomly from inspected trees in orchards and seedlings in nurseries for ApMv, ACLSV and for ASPV in April of 2008 and 2009. A total of 20 pear samples from 15 symptomatic and 5 asymptomatic young trees of local pear cultivars (‘Mustafa Bey’ and ‘Ankara’ cvs.) and 6 from quince (unknown cultivar) were collected. All samples were detected for the presence of the viruses by ELISA. Fifteen samples (ten samples selected from symptomatic plants and 5 samples from asymptomatic trees) were also tested for the viruses by Bioassay-sap inoculation. Sap extracts were mechanically inoculated on some indicator plants (Chenopodium amaranthicolor, C. quinoa, Cucumis sativus, Gompherena globulosa, Nicotiana benthamiana, N. glutinosa, N. occidentalis). Although, mild symptoms including vein clearing and leaf necrosis were observed on N. glutinosa, and N. occidentalis test plants, in general, no symptoms associated with the investigated viruses appeared on test plants. Some samples from local pear cultivars in Hatay were found to be infected with PVYD by serological tests. ASPV was found to be present in 60% of the ELISA-tested samples in 2008. This preliminary study demonstrated that a high rate of ASPV infection was present for local pear cvs. in the province. ApMV, ACLSV infections were not tested in detected samples. Keywords: ELISA, Ilarvirus, pear, pome fruit, test plan

Re: Fascelli et al: Combined biparametric prostate magnetic resonance ımaging and prostate-specific antigen in the detection of prostate cancer: A validation study in a biopsy-naive patient population (urology 2016; 88:125-134)

WOS: 000383698300057PubMed ID: 27112511I read with interest the article by Fascelli et al1The authorsaimed to validate the use of biparametric (T2- and diffusion-weighted) magnetic resonance imaging and prostate-specific antigen (PSA) or PSA density in a biopsy-naivecohort at risk for prostate cancer (PCa) and they used for-mulas for validation

Tomato ringspot nepovirus (ToRSV) in wild blackberry (Rubus fruticosus L.) in Hatay province of Turkey

During observations of virus-like symptoms in wild blackberry (Rubus fruticosus L., Rosaceae) some stunted plants growing in the border of stone-fruit orchards in Hatay were found showing severe yellow blotching and deformity of the leaves. Samples (shoots and leaves) were collected in September 2008 and May 2009 from wild blackberry plants growing at the border of apricot orchards and neighboring stone fruit nurseries in Hatay province in Eastern Mediterranean Region of Turkey. Each of 12 wild blackberry samples taken from 7 symptomatic and 5 symptomless plants were tested for virus by mechanical inoculation of sap to herbaceous plants. Sap was inoculated on Chenopodium amaranthicolor, C. quinoa, Cucumis sativus, Gombhrena globosa L., Nicotiana benthamiana, N. clevelandii, N. glutinosa, Phaseolus vulgaris L. and Vigna unguiculata L. Sap from six symptomatic plants induced symptoms of necrotic or chlorotic lesions, and ringspot on test plants. No symptoms were induced in the test plants inoculated by sap from symptomless blackberry plants. A sap-transmissible virus was obtained from all symptomatic plants and later identified as Tomato ringspot nepovirus (ToRSV) by enzyme-linked immunosorbent assay-ELISA. Thus, results of biological indexing were also confirmed by serological assays (ELISA). Cuttings of symptomatic plants were rooted in pots and kept in an insect-proof growing room for symptom observations and testing. Investigations on the other viruses in wild and cultivated Rubus spp. and its vector/s are still in progress. Further studies are necessary to investigate the distribution and natural transmission of the main virus diseases in cultivated Rubus spp. in particular because of the economic importance of Rubus cultivation and the recent increase in new commercial plantings in Hatay. This work represents the first report of ToRSV in wild blackberry (R. fruticosus) in Turkey. Keywords: Bioassay, Blackberry, ELISA, Rubus, ToRSV, viru

An investigation on Rose Mosaic Disease of Rose in Hatay-Turkey

Field inspections were carried out to investigate Apple mosaic virus (ApMV), Arabis mosaic virus (ArMV) and Prunus necrotic ringspot virus (PNRSV) which are associated with rose mosaic disease (RMD) during the years of 2008 and 2009. Characteristic symptoms, including chlorotic line patterns (zigzag pattern), vein-banding and mottles in leaves were observed during spring. Symptoms were also evident during summer on leaves produced until early summer. Flower abnormalities as phyllody were also exhibited during autumn. Distortion and reduction in flower size and early leaf drop have been observed on symptomatic plants in winter. Leaf samples taken from 15 rose plants from ‘Rosa hybrida L.’ neighboring stone fruit orchards were tested by mechanical inoculation to herbaceous plants and enzymelinked immunosorbent assay (DAS-ELISA) for the presence of ApMV, ArMV and PNRSV, which are the viruses related to RMD. Catharanthus roseus L. G. Don, Chenopodium amaranthicolor Coste and Reyn., C. quinoa Wild, Cucumis sativus L., Gomphrena globosa L., Lagenaria siceraria (Mol.) Standl, Nicotiana benthamiana L., N. clevelandii L., Nicotiana glutinosa L., Phaseolus vulgaris L., Vigna unguiculata L. test plants were incubated after mechanical inoculation for symptom appearance at 25°C±2 and 16:8 h photoperiod (day:night) conditions in an insectproof room. Symptoms including chlorotic local lesions, systemic necrosis, stunting and yellow mottling began to appear on C. quinoa and C. sativus in 2-3 weeks after sap inoculation. Serological tests of test plants are in progress. The rose plants showing symptoms in home gardens were re-tested for the viruses in spring by ELISA. According to the results of the Bioassay by sap inoculation and ELISA on symptomatic rose plants, the causal agent of RMD is PNRSV. The viruses affecting rose plants spread through cuttings from a diseased plant because new plants are generally produced by the rooting of cuttings in home gardens in Hatay. Further detailed investigations are necessary to find out the causal agent/s of RMD in rose in the region, because infected rose plants can be an important factor in the epidemiology of virus diseases caused by these agents in rose plantations. Keywords: ApMV, Bioassay, ELISA, Oil Rose, PNRSV, viru

Ahmet Hamdi Tanpınar'ı anarken

Taha Toros Arşivi, Dosya No: 40-Ahmet Hamdi Tanpınarİstanbul Kalkınma Ajansı (TR10/14/YEN/0033) İstanbul Development Agency (TR10/14/YEN/0033

Ahmed Fakih : Anadolu'da Türkçe Eserler Veren Mutasavvıf Şair

[No Abstract Available

Yusuf Peygamber 'Aleyhi's-Selam-Nıng Ta'bir Kitabı

[No Abstract Available