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11,325 real negative results, null findings, and replication failures in Medicine · Negative / Null Result Report. 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 accessMedicine

The efficacy of valproate in acute mania, bipolar depression and maintenance therapy for bipolar disorder: an overview of systematic reviews with meta-analyses

Flávio Kapczinski, Jair Mari, Luiz Henrique Junqueira Dieckmann et al. · 2024 · BMJ Open

Objective This study aims to conduct an overview on the comparative efficacy of valproate in acute mania, bipolar depression and maintenance treatment of bipolar disorder (BD).Method We performed an overview of systematic reviews with meta-analyses of randomised controlled trials (RCTs), registered in PROSPERO (CRD42024497749). We searched Medline and Cochrane Database of Systematic Reviews. Summary measures comparing valproate with placebo or other active drugs were described.Results We included 26 systematic reviews. For acute mania (31 RCTs, n=4376), valproate showed a significantly better

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Negative / Null Result ReportOpen accessMedicine

SLC26A4 gene copy number variations in Chinese patients with non-syndromic enlarged vestibular aqueduct

Zhao Jiandong, Yuan Yongyi, Chen Jing et al. · 2012 · Journal of Translational Medicine

Abstract Background Many patients with enlarged vestibular aqueduct (EVA) have either only one allelic mutant of the SLC26A4 gene or lack any detectable mutation. In this study, multiplex ligation-dependent probe amplification (MLPA) was used to screen for copy number variations (CNVs) of SLC26A4 and to reveal the pathogenic mechanisms of non-syndromic EVA (NSEVA). Methods Between January 2003 and March 2010, 923 Chinese patients (481 males, 442 females) with NSEVA were recruited. Among these, 68 patients (7.4%) were found to carry only one mutant allele of SLC26A4 and 39 patients (4.2%) lacke

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Negative / Null Result ReportOpen accessMedicine

Investigating the Relationship between Self-Directed Learning and E-Citizenship knowledge and its comparison between Students of University of Mazandaran and Babol University of Medical Sciences

fatemeh marhemati, reza mir arab razi, mostafa azizi · 2020 · آموزش پزشکی

Background and Objective: Creating and developing self-directed learning skills has become one of the goals of education in recent decades, and today's students need to learn and acquire comprehensive information in this regard, or better to say, learn information and communication technology skills, to Be able to use electronic services. The purpose of this study was to investigate the relationship between electronic citizenship knowledge and self-directed learning of students of University of Mazandaran and Babol University of medical sciences. Methods: This study is descriptive-analytical i

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Negative / Null Result ReportOpen accessMedicine

Comparison of polishing effects of three polishing systems on machinable composite resins

LIU Yanan, WANG Likai, LIU Sisi et al. · 2019 · 口腔疾病防治

Objective To compare the polishing effects of three different polishing systems on machinable compos⁃ ite resins and to provide a basis for the rational selection of polishing systems in the clinic. Methods Block HC, Cerasmart, and Hyramic were fabricated into 90 test pieces. Then, 30 test pieces for each material were randomly divid⁃ ed into 3 groups with 10 pieces per group. The pieces were polished with the Vita Enamic® Polishing Set (Vita group), EVE RA341 composite polishing set (Eve group), and Toboo M elastic ceramic polishing set (Tob group). The surface roughness and gloss of each tes

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Negative / Null Result ReportOpen accessMedicine

Duration of Untreated Psychosis in Chinese and Mauritian: Impact of Clinical Characteristics and Patients' and Families' Perspectives on Psychosis.

Jaya Prishni Devi Thakoor, Huixi Dong, Xiaojie Zhang et al. · 2016 · PLoS ONE

Background Duration of untreated psychosis (DUP) is a potentially modifiable prognostic factor of course and prognosis of psychiatric disorders. Few studies have demonstrated that different cultural backgrounds or perspectives on psychosis may be important factors to the DUP. This study attempted to explore whether the DUP was different in Chinese and Mauritians and to clarify potential influencing factors to a long DUP (>3 months). Methods 200 patients from China and 100 patients from Mauritius were enrolled in the study. Their respective family members were also recruited. Demographic and cl

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Negative / Null Result ReportOpen accessMedicine

Effects of Intraosseous Tibial vs. Intravenous Vasopressin in a Hypovolemic Cardiac Arrest Model

Justin Fulkerson, MSN, Robert Lowe, BSN, Tristan Anderson, BSN et al. · 2016 · Western Journal of Emergency Medicine

Introduction: This study compared the effects of vasopressin via tibial intraosseous (IO) and intravenous (IV) routes on maximum plasma concentration (Cmax), the time to maximum concentration (Tmax), return of spontaneous circulation (ROSC), and time to ROSC in a hypovolemic cardiac arrest model. Methods: This study was a randomized prospective, between-subjects experimental design. A computer program randomly assigned 28 Yorkshire swine to one of four groups: IV (n=7), IO tibia (n=7), cardiopulmonary resuscitation (CPR) + defibrillation (n=7), and a control group that received just CPR (n=7).

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Negative / Null Result ReportOpen accessMedicine

Comparison of Characteristics According to Reflux Type in Patients With Laryngopharyngeal Reflux

Jun Seok Lee, Ah Ra Jung, Jung Min Park et al. · 2018 · Clinical and Experimental Otorhinolaryngology

Objectives To analyze laryngopharyngeal reflux (LPR) as an acidic, nonacidic, or mixed type according to 24-hour multi-channel intraluminal impedance (MII) pH monitoring and the clinical characteristics of each type. Methods Ninety patients were prospectively enrolled in this study. All patients underwent 24-hour MII pH monitoring as a diagnostic tool. Eighty-three patients were diagnosed with LPR. The patients were classified into three groups according to the pH of the hypopharyngeal probe: the acid reflux group, nonacid reflux group, and mixed reflux group. Subjective symptoms and objective

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Negative / Null Result ReportOpen accessMedicine

Comparison of Mobilisation with Movement and Cryotherapy in Shoulder Impingement Syndrome-A Randomised Clinical Trial

Saumya Srivastava, Charu Eapen, Harramb Mittal · 2018 · Journal of Clinical and Diagnostic Research

Introduction: Shoulder Impingement Syndrome (SIS) is one of the common cause of shoulder ailment which leads to pain and restriction of the movements. Though Mobilisation with Movement and cryotherapy, both are found to be effective in managing SIS, there is no comparison done between the two treatments. Aim: To compare the effectiveness of Mobilisation With Movement (MWM) and cryotherapy in SIS. Materials and Methods: A randomised clinical trial was conducted on 22 subjects who aged between 18-64 years, and those who had a positive painful arc, three positive tests out of five i.e., Neer’s Im

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Negative / Null Result ReportOpen accessMedicine

Serum Vascular Endothelial Growth Factor in Pregnant Women with Different Types of Assisted Reproductive Techniques

Zainab Y. Ejam, Şevki Adem, Asmaa Kadhim Gatea · 2024 · Medical Journal of Babylon

Background: Vascular endothelial growth factor (VEGF) is crucial for the implantation of a fertilized egg and for the development of placental blood vessels. This study was conducted to detect the serum VEGF level of pregnant with different types of assisted reproductive techniques in relation to the age group, body mass index (BMI), and type of infertility. Objectives: The aim of this study was to determine the levels of serum VEGF in different types of assisted pregnancy. Materials and Methods: Enzyme-linked immunosorbent assay was used for the detection of VEGF levels in the serum of pregna

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Negative / Null Result ReportOpen accessMedicine

Aqueous and methanol extracts of Paullinia pinnata improve MSUc uptake in macrophages and in vitro antioxidant effects

Pius Pum Tseuguem, Télesphore Benoît Nguelefack, Elvine Pami Nguelefack-Mbuyo et al. · 2026 · Scientific Reports

Abstract Extracts of Paullinia pinnata have demonstrated therapeutic effects in monosodium urate (MSU)-induced gout in rats, notably by reducing inflammation and hyperalgesia, as well as enhancing antioxidant activity in vivo. However, their in vitro antioxidant potential and their effects on MSU-stimulated macrophages remain insufficiently explored. This study aims to investigate the in vitro antioxidant properties of P. pinnata, with a particular focus on MSU uptake in stimulated macrophages. The in vitro antioxidant activities of aqueous (AEPP) and methanolic (MEPP) extracts of P. pinnata l

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Negative / Null Result ReportOpen accessMedicine

Temporal and spatial distribution of soil water and nitrate content affected by surface irrigation and fertilizer rate in silage corn fields

Yuchun Liu, Ning Wang, Changsong Jiang et al. · 2020 · Scientific Reports

Abstract Among surface irrigation systems, long border and furrow are more adaptive to mechanized farming but may cause a non-uniform distribution of water and nutrients. In this study, field experiments were carried out in a flat silage corn field in Hebei, China to investigate the uniformity along the length of border or furrow to understand the spatial and temporal distribution characteristics of soil water, electrical conductivity, and nitrate. This will guide irrigation and fertigation management recommendations, land consolidation, and high standard farmland construction. Border and furr

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Negative / Null Result ReportOpen accessMedicine

A Randomized Clinical Trial Comparing the Effect of Rapidly Infused Crystalloids on Acid-Base Status in Dehydrated Patients in the Emergency Department

Hakan Hasman, Orhan Cinar, Ahmet Uzun, Erdem Cevik, Loni Jay, Bilgin Comert · 2012 · International Journal of Medical Sciences

Study objective: To compare the effect of normal saline (NS), lactated Ringer's, and Plasmalyte on the acid-base status of dehydrated patients in the emergency department (ED). Method: We conducted a prospective, double-blind, randomized trial of consecutive adult patients who presented to the emergency department with moderate-severe dehydration. Patients were randomly allocated to blindly receive normal saline (NS), lactated Ringer's or Plasmalyte at 20 ml/kg/h for 2 hours. Outcome measures of the study were pH and changes in electrolytes, including serum potassium, sodium, chloride and bica

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Negative / Null Result ReportOpen accessMedicine

Test-retest reliability and validity of the Importance of Olfaction Questionnaire in Denmark.

Daniel Tchemerinsky Konieczny, Alexander Wieck Fjaeldstad, Kristian Sandberg · 2024 · PLoS ONE

While measures to detect psychophysical olfactory ability are a crucial part of clinicians' assessment of potential olfactory loss, it gives no indication of how olfaction is experienced by the patient and these different aspects often deviate substantially. To ensure quality and reproducibility of subjectively reported olfactory experience and significance, the Importance of Olfaction Questionnaire (IO-Q) was introduced around a decade ago, and while initial validations have produced promising results, important aspects remain nearly unexamined. For example, the test-retest reliability has ra

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Negative / Null Result ReportOpen accessMedicine

Body Mass Index and Risk of Prostate Volume, International Prostate Symptom Score, Maximum Urinary Flow Rate, and Post-Void Residual in Benign Prostatic Hyperplasia Patients

Bing-Hui Li, Tong Deng, Qiao Huang et al. · 2019 · American Journal of Men's Health

The objective of this study was to evaluate association between body mass index (BMI) and prostate volume (PV), international prostate symptom scores (IPSS), maximum urinary flow rate ( Q max ), and post-void residual (PVR) of Chinese benign prostatic hyperplasia (BPH) patients. All newly diagnosed BPH patients between September 2016 and August 2018 were selected and 788 patients were included. According to BMI, the patients were categorized into four groups, while according to PV, IPSS, Q max , and PVR, they were categorized into two groups based on clinical significant cutoffs. Univariable a

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Negative / Null Result ReportOpen accessMedicine

Neuromuscular dynamics during isometric knee contractions: effects of target force, knee angle, and tibial rotation on force steadiness

Han Yuan, Maeng-Kyu KIM · 2025 · Scientific Reports

Abstract This study investigated neuromuscular variations across low to moderate target force levels, three knee joint angles and tibial rotation positions, examining their correlations with muscle morphology and their collective impact on force steadiness (FS). Twelve young adult males performed knee extension tasks under three different tibial rotation conditions: internal rotation (IR), neutral rotation (NR), and external rotation (ER). All tasks involved submaximal isometric contractions at the knee joint. Participants performed submaximal isometric contractions at three knee joint angles

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Negative / Null Result ReportOpen accessMedicine

Application and limitation of a biological clock-based method for estimating time of death in forensic practices

Akihiko Kimura, Yuko Ishida, Mizuho Nosaka et al. · 2023 · Scientific Reports

Abstract Estimating time of death is one of the most important problems in forensics. Here, we evaluated the applicability, limitations and reliability of the developed biological clock-based method. We analyzed the expression of the clock genes, BMAL1 and NR1D1, in 318 dead hearts with defined time of death by real-time RT-PCR. For estimating the time of death, we chose two parameters, the NR1D1/BMAL1 ratio and BMAL1/NR1D1 ratio for morning and evening deaths, respectively. The NR1D1/BMAL1 ratio was significantly higher in morning deaths and the BMAL1/NR1D1 ratio was significantly higher in e

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Negative / Null Result ReportOpen accessMedicine

Is genu varum a risk factor for the prevalence and severity of achilles tendinopathy? A cross-sectional study of Nigerian elite track and field athletes

Ayoola Ibifubara Aiyegbusi, Bosede Abidemi Tella, Ganiyat Adebanke Sanusi · 2020 · Nigerian Postgraduate Medical Journal

Background: Achilles tendinopathy (AT) is one of the most frequently reported ankle and foot overuse injuries. Prior studies have reported altered biomechanical variables of the lower limb as risk factors for the prevalence and severity of AT in athletes, especially in Caucasians, but there are few reports on African elite athletes. Because it is established that anthropometric and biomechanical values vary with racial disposition, this study was designed to investigate the association between selected physical and biomechanical variables of the lower limb and the prevalence and severity of AT

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Negative / Null Result ReportOpen accessMedicine

The dietary patterns of 12-year-old children and their awareness about the effect of diet on oral health in Iran

Maryam Rad, Arash Shahravan, Ali Akbar Haghdoost · 2017 · Journal of Oral Health and Oral Epidemiology

BACKGROUND AND AIM: Foods containing carbohydrates have a major effect on the pathogenesis of dental caries. There is a direct correlation between frequency of consumption of foods containing sugar and dental caries. The purpose of this study was to evaluate the dietary patterns of 12-year-old children and their awareness about the effect of diet on oral health in Iran. METHODS: A cross-sectional survey was conducted on 1554 children aged 12 years in 5 provinces in Iran. Subjects were selected based on a multistage stratified cluster random sampling procedure. Data were collected by a cultural

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Negative / Null Result ReportOpen accessMedicine

Estimation of Serum Ferritin Levels in Blood Donors and its Association with Frequency of Blood Donation and Blood Indices

Amrita S Kumar, A Geetha, Jim Joe et al. · 2021 · Journal of Clinical and Diagnostic Research

Introduction: Blood donation is one of the most significant contributions that a person can make towards the society. A donor generally donates maximum 450 mL of blood at the time of donation. If 450 mL of blood is taken in a donation, men lose 242±17 mg and women lose 217±11 mg of iron. Hence, adequate iron stores are very important in maintenance of the donor’s health. Aim: To assess the influence of frequency of blood donation on iron levels of blood donors by estimating Haemoglobin (Hb) and other blood indices which reflect iron status of blood and serum ferritin which reflects body iron s

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Negative / Null Result ReportOpen accessMedicine

Unmet Nutritional and Psychological Needs of Cancer Patients: An Integrated Multi-Professional Model Approach

Giuseppe Carruba, Maria Luisa Calagna, Ildegarda Campisi et al. · 2022 · Diseases

This paper presents a multi-professional integrated approach toward the recognition and management of the nutritional and psychological needs of cancer patients. In particular, the patients undertook a multi-professional, multistep process that included the collection of both personal and clinical data, the evaluation of anthropometric measures, nutritional status and psychometric indices, and an ensuing personalized nutritional prescription and psychological support, ultimately leading to combined nutritional and psychological interventions to control their adherence to a nutritional program

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Negative / Null Result ReportOpen accessMedicine

Changes in brain white matter structure are associated with urine proteins in urologic chronic pelvic pain syndrome (UCPPS): A MAPP Network study.

Davis C Woodworth, Adelle Dagher, Adam Curatolo et al. · 2018 · PLoS ONE

The Multidisciplinary Approach to the Study of Chronic Pelvic Pain (MAPP) Research Network has yielded neuroimaging and urinary biomarker findings that highlight unique alterations in brain structure and in urinary proteins related to tissue remodeling and vascular structure in patients with Urological Chronic Pelvic Pain Syndrome (UCPPS). We hypothesized that localized changes in diffusion tensor imaging (DTI) measurements might be associated with corresponding changes in urinary protein levels in UCPPS. To test this hypothesis, we created statistical parameter maps depicting the linear corre

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Negative / Null Result ReportOpen accessMedicine

Association between obesity and mortality from hematological malignancies among Japanese adults: The Japan Collaborative Cohort study.

Hana Wakasa, Satoshi Sunohara, Takashi Kimura et al. · 2025 · PLoS ONE

Obesity is a growing global health concern and has been associated with increased mortality from various cancer types, including hematological malignancies. However, evidence for this association in Asian populations, particularly among Japanese adults, remains limited. Thus, this study aimed to examine the association between obesity and mortality due to hematological malignancies. Data from 97,073 participants in the Japan Collaborative Cohort (JACC) Study were analyzed. The participants were followed for a mean duration of 17 years. Body mass index (BMI) was calculated using self-reported h

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Negative / Null Result ReportOpen accessMedicine

Interplay between lipid profiles, thyroid function, and gallstone disease: A clinical perspective

Vivek Nagappa, Akhila Bhandarkar · 2025 · Journal of Family Medicine and Primary Care

Background: New research points to a complicated relationship between gallstone disease (GSD), thyroid function, and lipid profiles. To better understand how to prevent and treat GSD, this study will look at how common thyroid abnormalities are among people with the diagnosis, as well as any dyslipidemias that may be present. Material and Methods: This is a cross-sectional observational study worked out at a tertiary care hospital in southern India’s Department of General Surgery. We enrolled 60 persons with a GSD diagnosis. We divided patients with only gallstones and gallstones with common b

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Negative / Null Result ReportOpen accessMedicine

DIASTASIS RECTI ABDOMINIS AND ITS ASSOCIATED RISK FACTORS IN POSTPARTUM WOMEN

Muhammad Hussain Iqbal, Tanveer Hussain, Fariha Khalid et al. · 2020 · Pakistan Armed Forces Medical Journal

Objective: To determine the frequency of diastasis recti abdominis and its associated risk factors in postpartum women. Study Design: Cross-sectional study. Place and Duration of Study: Omar Medical Center Lahore, Yaseen Medical Center Lahore and Social Security Hospital Lahore, from Sep 2019 to Dec 2019. Methodology: This study included 128 participants fulfilling the eligibility criteria. The assessment of diastasis recti abdominis was done manually by a female physiotherapist using single finger, double finger and three finger methods on abdomen at three levels: at the umbilicus, 4.5 cm bel

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Negative / Null Result ReportOpen accessMedicine

Assessment of Retinal and Choroidal Measurements in Chinese School-Age Children with Cirrus-HD Optical Coherence Tomography.

Tao Li, Xiaodong Zhou, Zhi Wang et al. · 2016 · PLoS ONE

To evaluate retinal thickness (RT), retinal volume (RV) and choroidal thickness (ChT) in Chinese children using Cirrus-HD optical coherence tomography (OCT), and assess their associations with spherical equivalent (SE), age and gender.This was a prospective study that recruited 193 healthy Chinese children (193 eyes) with no ophthalmic disease history between December 2012 and December 2013. RT and RV were acquired using OCT. Subfoveal ChT (SFCT) and ChT1-mm and 2-mm temporal, nasal, superior and inferior to the fovea were measured manually.RT in the inner temporal and nasal regionsdiffered si

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Negative / Null Result ReportOpen accessMedicine

The association between growth factors and blood factors with early childhood caries

Hoda Shamsaddin, Fatemeh Jahanimoghadam, Hamidreza Poureslami et al. · 2017 · Journal of Oral Health and Oral Epidemiology

BACKGROUND AND AIM: Early childhood caries (ECC) is a specific form of rampant dental caries affecting infants and young children. ECC is still a problem that threatens the health of the community and its management is important. It is believed that the majorities of children with ECC also suffer from malnutrition, anemia, low weight and altered physical growth patterns. This study was undertaken to compare blood indices [mean corpuscular volume (MCV), hemoglobin and serum ferritin] in a population of children in Kerman, Iran, and the association between growth factors, blood parameters, and E

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Negative / Null Result ReportOpen accessMedicine

Cancer Incidence in Hemodialysis Patients With End-Stage Renal Disease

Yousef Roosta, Ahmad Nazarpour, Farhad Behzadi et al. · 2025 · Disease and Diagnosis

Background: The number of individuals undergoing dialysis is rising. Impaired renal function has been linked to a heightened risk of cancer. This study aimed to examine cancer incidence among hemodialysis (HD) patients. Materials and Methods: This retrospective cross-sectional study analyzed the medical records of individuals with newly diagnosed end-stage renal disease (ESRD) who initiated HD sessions between July 2018 and December 2023 at Urmia Imam Khomeini hospital. The data collected for this study included patient demographics, underlying diseases, malignancy status, and duration of mali

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Negative / Null Result ReportOpen accessMedicine

Thiopurine methyltransferase genotype and activity cannot predict outcomes of azathioprine maintenance therapy for antineutrophil cytoplasmic antibody associated vasculitis: A retrospective cohort study.

Arno C Hessels, Abraham Rutgers, Jan Stephan F Sanders et al. · 2018 · PLoS ONE

Azathioprine is a widely used immunosuppressive drug. Genetic polymorphisms and activity of the enzyme thiopurine methyltransferase (TPMT) have been associated with azathioprine efficacy and toxicity in several populations. We investigated whether these associations also exist for ANCA associated vasculitis (AAV) patients, who receive azathioprine maintenance therapy after remission induction with cyclophosphamide.207 AAV patients treated with cyclophosphamide induction and azathioprine maintenance therapy were included and followed for 60 months. TPMT genotype and tertiles of TPMT activity we

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Negative / Null Result ReportOpen accessMedicine

Variations of five eIF4E genes across cassava accessions exhibiting tolerant and susceptible responses to cassava brown streak disease.

Shanshan Shi, Xiuchun Zhang, M Alejandra Mandel et al. · 2017 · PLoS ONE

Cassava (Manihot esculenta) is an important tropical subsistence crop that is severely affected by cassava brown streak disease (CBSD) in East Africa. The disease is caused by Cassava brown streak virus (CBSV) and Ugandan cassava brown streak virus (UCBSV). Both have a (+)-sense single-stranded RNA genome with a 5' covalently-linked viral protein, which functionally resembles the cap structure of mRNA, binds to eukaryotic translation initiation factor 4E (eIF4E) or its analogues, and then enable the translation of viral genomic RNA in host cells. To characterize cassava eIF4Es and their potent

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