List of works by Ralph Urbatzka

A New Ergosterol Analog, a New Bis-Anthraquinone and Anti-Obesity Activity of Anthraquinones from the Marine Sponge-Associated Fungus Talaromyces stipitatus KUFA 0207. ⬇️

scientific article

Actinobacteria Isolated From : A Source of New Bioactive Compounds

scientific article published on 09 April 2019

Androgenic and antiandrogenic activities in water and sediment samples from the river Lambro, Italy, detected by yeast androgen screen and chemical analyses

scientific article published on 17 January 2007

Antiproliferative Effects of the Natural Oxadiazine Nocuolin A Are Associated With Impairment of Mitochondrial Oxidative Phosphorylation

scientific article published on 03 April 2019

Application of Bioactive Thermal Proteome Profiling to Decipher the Mechanism of Action of the Lipid Lowering 132-Hydroxy-pheophytin Isolated from a Marine Cyanobacteria

scientific article published on 21 June 2019

Aqueous leaf extracts display endocrine activities in vitro and disrupt sexual differentiation of male Xenopus laevis tadpoles in vivo.

scientific article published on 11 March 2010

Aromatase mRNA expression in the brain of adult Xenopus laevis exposed to Lambro river water and endocrine disrupting compounds

scientific article published on 22 April 2010

Aromatase, steroid-5-alpha-reductase type 1 and type 2 mRNA expression in gonads and in brain of Xenopus laevis during ontogeny

scientific article published on 9 February 2007

Bioactivities and Extract Dereplication of Isolated From Marine Sponges

scientific article published on 09 April 2019

Characterization and Biotechnological Potential of Intracellular Polyhydroxybutyrate by Stigeoclonium sp. B23 Using Cassava Peel as Carbon Source

scientific article published in 2021

Chlorophyll Derivatives from Marine Cyanobacteria with Lipid-Reducing Activities ⬇️

scientific article published on 17 April 2019

Cross-interference of two model peroxisome proliferators in peroxisomal and estrogenic pathways in brown trout hepatocytes.

scientific article published on 6 April 2017

Cytological, immunocytochemical, ultrastructural and growth characterization of the rainbow trout liver cell line RTL-W1.

scientific article published on 7 January 2013

Cytotoxicity of portoamides in human cancer cells and analysis of the molecular mechanisms of action

scientific article published on 7 December 2017

Diversity and Bioactive Potential of Actinobacteria Isolated from a Coastal Marine Sediment in Northern Portugal

scientific article published on 30 October 2020

Does atrazine affect larval development and sexual differentiation of South African clawed frogs?

scientific article

Dynamics of PPARs, fatty acid metabolism genes and lipid classes in eggs and early larvae of a teleost.

scientific article published on February 2013

Effects of ethinylestradiol and of an environmentally relevant mixture of xenoestrogens on steroidogenic gene expression and specific transcription factors in zebrafish.

scientific article published on 7 February 2012

Effects of the PPARα agonist WY-14,643 on plasma lipids, enzymatic activities and mRNA expression of lipid metabolism genes in a marine flatfish, Scophthalmus maximus.

scientific article

Endocrine disrupters with (anti)estrogenic and (anti)androgenic modes of action affecting reproductive biology of Xenopus laevis: I. Effects on sex steroid levels and biomarker expression.

scientific article published on 27 October 2006

Endocrine disrupting chemicals (EDC) with (anti)estrogenic and (anti)androgenic modes of action affecting reproductive biology of Xenopus laevis: II. Effects on gonad histomorphology

scientific article published on 22 October 2007

Endocrine disruption in aquatic vertebrates.

scientific article published on April 2009

Estrogenic and anti-estrogenic influences in cultured brown trout hepatocytes: Focus on the expression of some estrogen and peroxisomal related genes and linked phenotypic anchors.

scientific article published on 24 October 2015

Estrogenicity profile and estrogenic compounds determined in river sediments by chemical analysis, ELISA and yeast assays

scientific article

Exposure of Xenopus laevis tadpoles to finasteride, an inhibitor of 5-alpha reductase activity, impairs spermatogenesis and alters hypophyseal feedback mechanisms.

scientific article published on 24 June 2009

Expression profiles of LHbeta, FSHbeta and their gonadal receptor mRNAs during sexual differentiation of Xenopus laevis tadpoles.

scientific article published on 18 February 2010

GST transcriptional changes induced by a toxic Microcystis aeruginosa strain in two bivalve species during exposure and recovery phases

article

Genome specific PPARαB duplicates in salmonids and insights into estrogenic regulation in brown trout

scientific article published on 14 April 2017

Hierridin B Isolated from a Marine Cyanobacterium Alters VDAC1, Mitochondrial Activity, and Cell Cycle Genes on HT-29 Colon Adenocarcinoma Cells.

scientific article

Identification of Cyanobacterial Strains with Potential for the Treatment of Obesity-Related Co-Morbidities by Bioactivity, Toxicity Evaluation and Metabolite Profiling ⬇️

scientific article published on 10 May 2019

In vitro exposure of Nile tilapia (Oreochromis niloticus) testis to estrogenic endocrine disrupting chemicals: mRNA expression of genes encoding steroidogenic enzymes

scientific article published on July 2011

Insights into the potential of picoplanktonic marine cyanobacteria strains for cancer therapies - Cytotoxic mechanisms against the RKO colon cancer cell line

scientific article published on 27 May 2016

Lipid reducing activity and toxicity profiles of a library of polyphenol derivatives.

scientific article published on 23 March 2018

Luteinizing hormone, follicle stimulating hormone, and gonadotropin releasing hormone mRNA expression of Xenopus laevis in response to endocrine disrupting compounds affecting reproductive biology

scientific article published on 5 December 2005

Mate calling behavior of male South African clawed frogs (Xenopus laevis) is suppressed by the antiandrogenic endocrine disrupting compound flutamide

scientific article published on 4 February 2010

Microplastics in freshwater ecosystems: what we know and what we need to know

scientific article

Morphological and molecular effects of cortisol and ACTH on zebrafish stage I and II follicles

scientific article

New Aromatic Bisabolane Derivatives with Lipid-Reducing Activity from the Marine Sponge Myrmekioderma sp

scientific article published on 22 June 2019

Normalization strategies for gene expression studies by real-time PCR in a marine fish species, Scophthalmus maximus.

scientific article published on 19 March 2013

Pex11α in brown trout (Salmo trutta f. fario): Expression dynamics during the reproductive cycle reveals sex-specific seasonal patterns

scientific article

Portoamides A and B are mitochondrial toxins and induce cytotoxicity on the proliferative cell layer of in vitro microtumours

scientific article published on 27 December 2019

Potential Anti-Obesity, Anti-Steatosis, and Anti-Inflammatory Properties of Extracts from the Microalgae Chlorella vulgaris and Chlorococcum amblystomatis under Different Growth Conditions

scientific article published in 2021

Regulation of Ovarian Development and Function in Teleosts

article

Reproductive hormones affect follicular cells and ooplasm of Stage I and II oocytes in zebrafish

scientific article

Sex-steroids and hypolipidemic chemicals impacts on brown trout lipid and peroxisome signaling — Molecular, biochemical and morphological insights

scientific article published on 07 June 2018

Silencing of PPARαBb mRNA in brown trout primary hepatocytes: effects on molecular and morphological targets under the influence of an estrogen and a PPARα agonist

scientific article published on 07 December 2018

Steroid exposure during larval development of Xenopus laevis affects mRNA expression of the reproductive pituitary-gonadal axis in a sex- and stage-dependent manner

scientific article

Testing the effects of ethinylestradiol and of an environmentally relevant mixture of xenoestrogens as found in the Douro River (Portugal) on the maturation of fish gonads--a stereological study using the zebrafish (Danio rerio) as model

scientific article published on 20 July 2012

The Marine Seagrass Halophila stipulacea as a Source of Bioactive Metabolites against Obesity and Biofouling

scientific article published on 29 January 2020

Uncovering the Bioactive Potential of a Cyanobacterial Natural Products Library Aided by Untargeted Metabolomics

scientific article published in 2021

Viability analysis of oocyte-follicle complexes and gonadal fragments of zebrafish as baseline for toxicity testing

scientific article published on 22 October 2013

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