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Browse the failure-mode index

21,681 real negative results, null findings, and replication failures. Search the index →

WASTE indexes published research — it does not host or republish full papers. Each entry is a metadata record compiled from open scholarly databases; the abstract is shown in full only where the paper is openly licensed, otherwise a short excerpt under fair use. Classifications are automated and approximate.

Negative / Null Result ReportOpen accessAgricultural and Biological Sciences

A viroid-derived system to produce large amounts of recombinant RNA in Escherichia coli

José‐Antonio Daròs, Verónica Aragonés, Teresa Cordero · 2018 · Scientific Reports

Viruses have been engineered into useful biotechnological tools for gene therapy or to induce the synthesis of products of interest, such as therapeutic proteins and vaccines, in animal and fungal cells, bacteria or plants. Viroids are a particular class of infectious agents of higher plants that exclusively consist of a small non-protein-coding circular RNA molecule. In the same way as viruses have been transformed into useful biotechnological devices, can viroids be converted into beneficial tools? We show herein that, by expressing Eggplant latent viroid (ELVd) derived RNAs in Escherichia c

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Negative / Null Result ReportOpen accessImmunology and Microbiology

Evaluation of host genetic and viral factors as surrogate markers for HTLV‐1‐associated myelopathy/tropical spastic paraparesis in Peruvian HTLV‐1‐infected patients

Michael Talledo, Giovanni López, Jeroen R. Huyghe et al. · 2010 · Journal of Medical Virology

Human T-lymphotropic virus 1 (HTLV-1)-associated myelopathy/tropical spastic paraparesis (HAM/TSP) is a complication that affects up to 5% of HTLV-1-infected individuals. Several host genetic and viral factors have been associated with the…

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Negative / Null Result ReportOpen accessMedicine

Local Ancestry Adjusted Allelic Association Analysis Robustly Captures Tuberculosis Susceptibility Loci

Yolandi Swart, Caitlin Uren, Paul D. van Helden et al. · 2021 · Frontiers in Genetics

Pulmonary tuberculosis (TB), caused by Mycobacterium tuberculosis , is a complex disease. The risk of developing active TB is in part determined by host genetic factors. Most genetic studies investigating TB susceptibility fail to replicate association signals particularly across diverse populations. South African populations arose because of multi-wave genetic admixture from the indigenous KhoeSan, Bantu-speaking Africans, Europeans, Southeast Asian-and East Asian populations. This has led to complex genetic admixture with heterogenous patterns of linkage disequilibrium and associated traits.

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Negative / Null Result ReportOpen accessEnvironmental Science

Boreal winter low‐frequency variability in CMIP5 models

Yun‐Young Lee, Robert X. Black · 2013 · Journal of Geophysical Research Atmospheres

Abstract This study assesses the capability of CMIP5 models in representing primary modes of boreal winter extratropical low‐frequency variability. Rotated principal component analysis is applied to monthly mean output from historical…

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Negative / Null Result ReportOpen accessMedicine

PCSK9 variation and association with blood pressure in African Americans: preliminary findings from the HyperGEN and REGARDS studies

Ngan T.K. Tran, Stella Aslibekyan, Hemant K. Tiwari et al. · 2015 · Frontiers in Genetics

Proprotein convertase subtilisin/kexin type 9 (encoded by PCSK9) plays a well-known role in the regulation of low-density lipoprotein (LDL) receptors, and an inhibitor of this enzyme is a promising new therapeutic for hyperlipidemia. Recently, animal and human studies also implicate PCSK9 genetic variation in the regulation of blood pressure. The goal of this study was to examine if common and rare polymorphisms in PCSK9 are associated with blood pressure in an African-American population at high risk for cardiovascular disease. Using genomic data assayed on the Affymetrix 6.0 array (n = 1199)

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Negative / Null Result ReportOpen accessBusiness, Management and Accounting

Firm-specific determinants of stock prices in an emerging capital market: Evidence from Ghana Stock Exchange

Felix Kwame Aveh, Dadson Awunyo‐Vitor · 2017 · Cogent Economics & Finance

This study seeks to examine the influence of firm-specific determinants of stock prices in an emerging market with particular reference to firms listed on the Ghana Stock Exchange. The study employs a data-set from all listed firms on the Ghana Stock Exchange from 2008 to 2014. The study used panel regression analysis to analyse the data. In general, the study found that accounting information, specifically earning per share, return on equity, book value and market capitalization of the firms, is relevant in explaining stock prices after the adoption of International Financial Reporting Standa

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Negative / Null Result ReportOpen accessImmunology and Microbiology

Cytokine-dependent and cytokine-independent roles for Mcl-1: genetic evidence for multiple mechanisms by which Mcl-1 promotes survival in primary T lymphocytes

Alexis Dunkle, Ivan Dzhagalov, Y-W He · 2011 · Cell Death and Disease

Myeloid cell leukemia sequence-1 (Mcl-1) is a critical anti-apoptotic factor in T lymphocytes. However, in spite of the many pro-apoptotic proteins with proposed binding to Mcl-1, the specific interactions by which Mcl-1 regulates primary T-cell survival under different conditions have not been fully explored. Further, how different trophic cytokines modulate the specific role(s) of Mcl-1 is unknown. Here, we use genetic mouse models to dissect the roles of Mcl-1 in primary T lymphocytes. Using the inducible Mcl-1-floxed estrogen receptor-Cre fusion protein (Mcl-1(f/f)ERCre) deletion system in

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Negative / Null Result ReportOpen accessMedicine

Significant differences in demographic, clinical, and pathological features in relation to smoking and alcohol consumption among 1,633 head and neck cancer patients

Raquel Ajub Moysés, Rossana Veronica Mendoza López, Patrı́cia Maluf Cury et al. · 2013 · Clinics

OBJECTIVE: As a lifestyle-related disease, social and cultural disparities may influence the features of squamous cell carcinoma of the head and neck in different geographic regions. We describe demographic, clinical, and pathological aspects of squamous cell carcinoma of the head and neck according to the smoking and alcohol consumption habits of patients in a Brazilian cohort. METHODS: We prospectively analyzed the smoking and alcohol consumption habits of 1,633 patients enrolled in five São Paulo hospitals that participated in the Brazilian Head and Neck Genome Project - Gencapo. RESULTS: T

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Negative / Null Result ReportOpen accessAgricultural and Biological Sciences

Variation in Significant Difference of Sausage Textural Parameters Measured by Texture Profile Analysis (TPA) under Changing Measurement Conditions

Sun-Hwa Shin, Won-Seok Choi · 2021 · Food Science of Animal Resources

This study examined the measurement conditions of the texture profile analysis (TPA) experiments that are typically used to measure the physical properties of sausage. As the measurement conditions (compression ratio and cross-head speed)…

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Failed Experiment ReportOpen accessComputer Science

Identification of Novel Cathepsin B Inhibitors with Implications in Alzheimer’s Disease: Computational Refining and Biochemical Evaluation

Nitin Chitranshi, Ashutosh Kumar, Samran Sheriff et al. · 2021 · Cells

Amyloid precursor protein (APP), upon proteolytic degradation, forms aggregates of amyloid β (Aβ) and plaques in the brain, which are pathological hallmarks of Alzheimer's disease (AD). Cathepsin B is a cysteine protease enzyme that catalyzes the proteolytic degradation of APP in the brain. Thus, cathepsin B inhibition is a crucial therapeutic aspect for the discovery of new anti-Alzheimer's drugs. In this study, we have employed mixed-feature ligand-based virtual screening (LBVS) by integrating pharmacophore mapping, docking, and molecular dynamics to detect small, potent molecules that act a

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Negative / Null Result ReportOpen accessEconomics, Econometrics and Finance

Abandonment of High‐Dose Chemotherapy/Hematopoietic Cell Transplants for Breast Cancer Following Negative Trial Results

David H. Howard, Carolyn Kenline, Hillard M. Lazarus et al. · 2011 · Health Services Research

OBJECTIVE: In 1999, three randomized controlled trials concluded that high-dose chemotherapy followed by autologous hematopoietic stem cell transplantation (HDC/HCT) is no better than conventional chemotherapy for women with breast cancer.…

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Negative / Null Result ReportOpen accessBiochemistry, Genetics and Molecular Biology

Diagnostic milk biomarkers for predicting the metabolic health status of dairy cattle during early lactation

S. Heirbaut, Xiaoping Jing, Barbara Stefańska et al. · 2022 · Journal of Dairy Science

Data on metabolic profiles of blood sampled at d 3, 6, 9, and 21 in lactation from 117 lactations (99 cows) were used for unsupervised k-means clustering. Blood metabolic parameters included -hydroxybutyrate (BHB), nonesterified fatty acids, glucose, insulin-like growth factor-1 (IGF-1) and insulin. Clustering relied on the average and range of the 5 blood parameters of all 4 sampling days. The clusters were labeled as imbalanced (n = 42) and balanced (n = 72) metabolic status based on the values of the blood parameters. Various random forest models were built to predict the metabolic cluster

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Negative / Null Result ReportOpen accessSocial Sciences

Teaching Clinical Pharmacology Using Team‐Based Learning: A Comparison Between Third‐ and Fourth‐Year Medical Students

Imad Bou Akl, Fatima Ghaddar, Ramzi Sabra et al. · 2011 · The Journal of Clinical Pharmacology

The purpose of this study was to formulate evidence-based recommendations on whether to deliver the team-based learning (TBL)-designed clinical pharmacology course at the American University of Beirut Faculty of Medicine (AUBFM) during the…

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Negative / Null Result ReportOpen accessDentistry

Spatial and contrast resolution of ultralow dose dentomaxillofacial CT imaging using iterative reconstruction technology

Gerlig Widmann, Alexander Bischel, Andreas Stratis et al. · 2017 · Dentomaxillofacial Radiology

OBJECTIVES: The objective of this study was to determine how iterative reconstruction technology (IRT) influences contrast and spatial resolution in ultralow-dose dentomaxillofacial CT imaging. METHODS: A polymethyl methacrylate phantom with various inserts was scanned using a reference protocol (RP) at CT dose index volume 36.56 mGy, a sinus protocol at 18.28 mGy and ultralow-dose protocols (LD) at 4.17 mGy, 2.36 mGy, 0.99 mGy and 0.53 mGy. All data sets were reconstructed using filtered back projection (FBP) and the following IRTs: adaptive statistical iterative reconstructions (ASIRs) (ASIR

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Negative / Null Result ReportOpen accessEngineering

A Practical Comparison of N-Body Algorithms

Guy E. Blelloch, Girija Narlikar · 2018 · Figshare

This work compares three algorithms for the three dimensional N-body problem, the Barnes-Hut algorithm, Greengard's Fast Multipole Method(FMM), and the Parallel Multipole Tree Algorithm (PMTA) to determine which of the algorithms performs…

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Negative / Null Result ReportAgricultural and Biological Sciences

Effects of within-generation thermal history on flight performance ofCeratitis capitata: colder is better

Nanike Esterhuizen, Susana Clusella‐Trullas, Corné E. van Daalen et al. · 2014 · Journal of Experimental Biology

The influence of thermal history on temperature-dependent flight performance was investigated in an invasive agricultural pest insect, Ceratitis capitata (Diptera: Tephritidae). Flies were exposed to one of four developmental acclimation…

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Negative / Null Result ReportOpen accessMedicine

Common intensive care scoring systems do not outperform age and glasgow coma scale score in predicting mid-term mortality in patients with spontaneous intracerebral hemorrhage treated in the intensive care unit

Marika Fallenius, Markus B. Skrifvars, Matti Reinikainen et al. · 2017 · Scandinavian Journal of Trauma Resuscitation and Emergency Medicine

BACKGROUND: Intensive care scoring systems are widely used in intensive care units (ICU) around the world for case-mix adjustment in research and benchmarking. The aim of our study was to investigate the usefulness of common intensive care scoring systems in predicting mid-term mortality in patients with spontaneous intracerebral hemorrhage (ICH) treated in intensive care units (ICU). METHODS: We performed a retrospective observational study including adult patients with spontaneous ICH treated in Finnish ICUs during 2003-2012. We used six-month mortality as the primary outcome of interest. We

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Negative / Null Result ReportMedicine

No significant association between vitamin D and COVID-19: A retrospective study from a northern Italian hospital

Davide Ferrari, Massimo Locatelli · 2020 · International Journal for Vitamin and Nutrition Research

Abstract. The world is currently overwhelmed by a novel coronavirus disease (COVID-19). Clinically, COVID-19 shows a broad range of manifestations: from asymptomatic to severe and possibly lethal interstitial pneumonia. Several studies…

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Negative / Null Result ReportOpen accessMedicine

Gradient boosted trees with individual explanations: An alternative to logistic regression for viability prediction in the first trimester of pregnancy

Thibaut Vaulet, M. Al‐Memar, H. Fourie et al. · 2021 · Computer Methods and Programs in Biomedicine

BACKGROUND: Clinical models to predict first trimester viability are traditionally based on multivariable logistic regression (LR) which is not directly interpretable for non-statistical experts like physicians. Furthermore, LR requires…

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Negative / Null Result ReportMedicine

Significant association of methylenetetrahydrofolate reductase single nucleotide polymorphisms with prostate cancer susceptibility in taiwan.

Hsi‐Chin Wu, Chao‐Hsiang Chang, Ru-Yin Tsai et al. · 2010 · PubMed

Prostate cancer is the most common cause of cancer death in men and is a major health problem worldwide. Methylene tetrahydrofolate reductase (MTHFR) plays an important role in folate metabolism and is also an important source of DNA…

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Negative / Null Result ReportOpen accessPsychology

Let’s Play Cards: Multi-Component Cognitive Training With Social Engagement Enhances Executive Control in Older Adults

Chun-Yu Kuo, Yang-Ming Huang, Yei‐Yu Yeh · 2018 · Frontiers in Psychology

Cognitive training and social engagement are two of the routes that potentially improve cognitive functions in older adults. The former targets specific functions so that an intervention can trigger the plasticity and efficiency of the underpinning neural systems, and the latter also provides an environment supportive of social and emotional needs. We investigated whether an integration of the two routes could enhance cognitive functions related to executive control, because no prior research has adopted a theory-driven approach to design a group-based cognitive training program for executive

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