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Effect Of Polyamines On In Vitro Anther Cultures Of Carrot (Daucus Carota L.)., Krystyna Górecka, Waldemar Kiszczak, Dorota Krzyzanowska, Urszula Kowalska, Agata Kapuscinska

Turkish Journal of Biology

This study examines the influence of the polyamines putrescine and spermidine on the efficiency of androgenesis in anther cultures of 2 carrot cultivars, Kazan F_1 and Narbonne F_1, and the effect of putrescine on the process of plant regeneration from androgenetic embryos. In the Kazan F_1 variety, an increase in the number of obtained embryos was achieved using each of the 2 polyamines separately and in combination. In contrast, no beneficial effects of polyamines on the efficiency of androgenesis were observed in the Narbonne F_1 variety. Putrescine added to the regeneration medium increased the number of obtained plants. For embryos …

In Vitro Regeneration And Conservation Of The Lentisk (Pistacia Lentiscus L.), İbrahi̇m Koç, Ahmet Onay, Yelda Özden Çi̇ftçi̇

Turkish Journal of Biology

Pistacia lentiscus L. (lentisk or mastic tree) is an economically important member of the genus Pistacia due to its valuable mastic resin. Shoot tips and nodal segments were used as explant sources from in vitro-germinated seeds of lentisk. Shoot tips were found to be suitable for multiple shoot formation. Thereafter, the influences of different growth regulators [N6-benzyladenine (BA), gibberellic acid (GA_3), naphthalene acetic acid (NAA), or jasmonic acid (JA)] together with various elicitors [silver nitrate (AgNO_3) or phloroglucinol (PG)] were assessed to develop efficient micropropagation protocol. Our results showed that the combination of all tested concentrations of GA_3 with 1.0 …

Biodegradation Of The Synthetic Pyrethroid Insecticide Α-Cypermethrin By Stenotrophomonas Maltophilia Og2, Özlem Gür, Murat Özdal, Ömer Faruk Algur

Turkish Journal of Biology

A novel gram-negative bacterium, OG2, was isolated from the body microflora of cockroaches (Blatta orientalis). Based on morphological, biochemical, and 16S ribosomal DNA sequence analysis, the isolated strain OG2 was identified as Stenotrophomonas maltophilia. This bacterial strain was screened for its alpha-cypermethrin-degrading potential with minimal salt medium (MSM). The alpha-cypermethrin degradation and utilization ability of the isolated organism was verified. Bacterial growth was measured by optical density in the presence of the pesticide at different concentrations (50-200 mg/L). S. maltophilia OG2 utilized alpha-cypermethrin as the sole carbon source for growth, and alpha-cypermethrin degradation increased when MSM was supplemented with glucose. …

Cover And Contents

Turkish Journal of Biology

No abstract provided.

Aging And Cancer: Molecular Facts And Awareness For Turkey, Gülgün Gündüz, Kayahan Fişkin

Turkish Journal of Biology

Two important subjects concerning extension of the human life-span are biological aging processes and their relationship to diseases, and especially to the formation of cancer. It is clear that an aging population poses some challenges for developing countries. We set out to show the demographic structure of Turkey and to discuss the feasibility of decreasing the prevalence of cancer. We overviewed the literature on the relationship between biological aging and cancer formation, the environmental causes of cancer, and age-related characteristics of cancer in the elderly. In addition, some statistical data on the changing demography of Turkey were reviewed. It is …

It Takes 2 Antioxidants To Tango: The Interaction Between Manganese Superoxide Dismutase And Glutathione Peroxidase-1, Dede N. Ekoue, Alan M. Diamond

Turkish Journal of Biology

Reactive oxygen species (ROS) are generated during mitochondrial oxidative metabolism. Accumulation of ROS without an effective antioxidant response can lead to oxidative stress, resulting in macromolecular damage that is implicated in the etiology of various diseases including cancer. ROS detoxification is regulated by various antioxidant proteins, specifically manganese superoxide dismutase (MnSOD), which catalyzes the conversion of superoxide into H_{2}O_{2}, and the subsequent conversion of H_{2}O_{2} into water is catalyzed by glutathione peroxidase 1 (GPx-1). In vitro and in vivo evidence supports a conflicting role of MnSOD in tumor biology and indicates that an interaction between MnSOD and GPx-1 can modulate …

Multidrug Resistance In Chronic Myeloid Leukemia, Mi̇ray Ünlü, Yağmur Ki̇raz, Fatma Necmi̇ye Kaci, Mehmet Ali̇ Özcan, Yusuf Baran

Turkish Journal of Biology

Chronic myeloid leukemia (CML) is characterized by the accumulation of Philadelphia chromosome-positive (Ph+) myeloid cells. Ph+ cells occur via a reciprocal translocation between the long arms of chromosomes 9 and 22 resulting in constitutively active Bcr-abl fusion protein. Tyrosine kinase inhibitors (TKIs) are used against the kinase activity of Bcr-abl fusion protein for the effective treatment of CML. However, the development of drug resistance, directed by different genetic mechanisms, is the major problem of clinical applications of TKIs. These mechanisms include mutations in the TKI binding site of Bcr-abl, overexpression of Bcr-abl, overexpression of ATP binding cassette transporters, aberrant ceramide …

Cancer Stem Cells: Emerging Actors In Both Basic And Clinical Cancer Research, Di̇dem Karakaş, Buse Cevatemre, Engi̇n Ulukaya

Turkish Journal of Biology

Cancer stem cells (CSCs) are a small subset of cancer cells within a tumor that are responsible for tumorigenesis and contribute to drug resistance. The CSC displays an anchorage-independent survival, active DNA-repair capacity, and relative quiescence and is capable of self-renewing and maintaining tumor growth and heterogeneity. At the molecular level, there are several signaling pathways (e.g., Wnt/Beta-catenin, Notch, and Hedgehog) to control CSC properties and alteration of these pathways has been recognized as an essential step for CSC transformation. Emerging evidence suggests that CSCs are clinically relevant. These cells are resistant to conventional chemotherapy and radiation treatment. Therefore, CSCs …

Cover And Contents

Turkish Journal of Biology

No abstract provided.

Blanche Dubois: Feminist Forerunner, Andrea M. Grey

Theses

Andrea M. Grey’s thesis, Blanche Dubois: Feminist Forerunner, explores Blanche Dubois from Tennessee Williams’ A Streetcar Named Desire as a proto-feminist figure. Challenging traditional interpretations of Blanche as merely fragile or delusional, Grey argues that Blanche exhibits traits of modern feminism, advocating for female independence, financial self-sufficiency, and resistance to patriarchal oppression.

Blanche’s education, career as a teacher, and efforts to manage her family’s estate position her as an independent woman in a male-dominated world. However, societal constraints and gendered double standards undermine her agency. Her sexual autonomy is condemned while her male counterparts’ indiscretions are ignored. Blanche’s opposition …

The Triangle Factory Fire Project Master's Thesis, Theresa Nigus

Theses

T71e Triangle Factory Fire Project brin.gs to light one or the worst industrial accidents in the history of New York City. The lives of 142 young immigrant workers were lost in a literal inferno, greatly due to the lack of safety regulations within the factory. Witness statements and actuc:11 transcript from the trial of factory co-owners Max Blanck and Isaac Harris illustrate the events that brought about some of the greatest change in safety regulations in American history.