124,193 results match your criteria vertical


Anisotropic compliance of robot legs improves recovery from swing-phase collisions.

Bioinspir Biomim 2021 Jun 15. Epub 2021 Jun 15.

Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Dr, La Jolla, California, 92093, UNITED STATES.

Uneven terrain in natural environments challenges legged locomotion by inducing instability and causing limb collisions. During the swing phase, the limb releases from the ground and arcs forward to target a secure next foothold. In natural environments leg-obstacle collisions may occur during the swing phase which can result in instability, and may require contact sensing and trajectory re-planning if a collision occurs. Read More

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Volume of the whale shark and their mechanism of vertical feeding.

Zoology (Jena) 2021 May 3;147:125932. Epub 2021 May 3.

Okinawa Churashima Research Center, Okinawa Churashima Foundation, 888, Motobu-cho, Okinawa, 905-0206, Japan; Okinawa Churaumi Aquarium, 424, Motobu-cho, Okinawa, 905-0206, Japan.

The present study provides a noninvasive method to estimate the body volume of sharks (Elasmobranchii, Selachii) using a computational geometric model. This method allows the volume of sharks to be estimated from lateral and ventral photographs assuming an elliptical body cross-sectional geometry. A comparison of the estimated and actual body volumes of several shark species showed that the estimation error was < 0. Read More

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Mat pilates method improve postural alignment women undergoing hormone therapy adjunct to breast cancer treatment. Clinical trial.

Complement Ther Clin Pract 2021 Jun 1;44:101424. Epub 2021 Jun 1.

Department of Physical Education at the Center for Health Sciences and Sports and Professor Postgraduate Program in Human Movement Sciences, Santa Catarina State University, Brazil.

The purpose of the study is to analyze the effects of a mat Pilates intervention on the postural alignment and balance of breast cancer women receiving hormone therapy. A two-arm randomized clinical trial included 34 breast cancer survivors divided randomly between a mat Pilates group (n = 18), that performed 16 weeks of mat Pilates exercises, and a control group (n = 16), who were invited to maintain their daily routine activities and received three educational sessions. Data collection occurred at baseline and at post-intervention time. Read More

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Quantitative analysis of the biomechanical response of semicircular canals and nystagmus under different head positions.

Hear Res 2021 Jun 6;407:108282. Epub 2021 Jun 6.

School of Information and Communication Engineering, Dalian University of Technology, Dalian 116024, China. Electronic address:

The semicircular canals (SCCs) in the vestibular system can sense angular motion of the head, which performs a crucial role in maintaining the human's sense of balance. The different spatial orientations of the head affect the response of human SCCs to rotational movement. In this study, we combined the numerical model of bilateral human SCCs with vestibulo-ocular reflex experiments, and quantitatively investigated the responses of SCCs to constant angular acceleration when the head was in different left-leaning positions, including the head tilted 0°, 15°, 30°, 45°, 60°, 70°, 80°, and 90° to the left. Read More

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Technical framework for wastewater-based epidemiology of SARS-CoV-2.

Sci Total Environ 2021 Jun 11;791:148271. Epub 2021 Jun 11.

Department of Pharmaceutical & Biological Engineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, China. Electronic address:

Wastewater-based epidemiology (WBE) is expected to become a powerful tool to monitor the dissemination of SARS-CoV-2 at the community level, which has attracted the attention of scholars all over the world. However, there is not yet a standard protocol to guide its implementation. In this paper, we proposed a comprehensive technical and theoretical framework of relative quantification via qPCR for determining the virus abundance in wastewater and estimating the infection ratio in corresponding communities, which is expected to achieve horizontal and vertical comparability of the data using a human-specific biomarker as the internal reference. Read More

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Effect of osteoporosis on adjacent segmental degeneration following posterior lumbar interbody fusion under whole body vibration.

World Neurosurg 2021 Jun 12. Epub 2021 Jun 12.

School of Chinese medicine, Jinan university, Guangzhou, China. Electronic address:

Background: Adjacent segmental degeneration (ASD) is one of the common complications following posterior lumbar interbody fusion (PLIF). Both whole body vibration (WBV) and osteoporosis are important factors associated with the biomechanics of the lumbar spine. However, up to now, no literature has been published to investigate the effect of osteoporosis on ASD following PLIF under WBV. Read More

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Intra operative assessment of the coronal balance in spinal deformity surgery : a technical note and retrospective study.

Acta Orthop Belg 2021 Mar;87(1):175-179

Obtaining a spine that is well balanced after fusion for scoliotic deformity is primordial for the patients' quality of life. A simple T-shaped instrument combined with standard intraoperative fluoroscopy can be of great help to evaluate the coronal alignment quickly. The aim of this study was to evaluate if a T-shaped device could predict the postoperative coronal balance. Read More

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Mechanistic understanding of the pollutant removal and transformation processes in the constructed wetland system.

Water Environ Res 2021 Jun 15. Epub 2021 Jun 15.

Environmental Hydrology Division, National Institute of Hydrology, Jalvigyan Bhawan, Roorkee, Uttarakhand, 247667, India.

Constructed wetland systems (CWs) are biologically and physically engineered systems to mimic the natural wetlands which can potentially treat the wastewater from the various point and non-point sources of pollution. The present study aims to review the various mechanisms involved in the different types of CWs for wastewater treatment and to elucidate their role in the effective functioning of the CWs. Several physical, chemical, and biological processes substantially influence the pollutant removal efficiency of CWs. Read More

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Comparison of foot strike sound between rearfoot, midfoot and forefoot strike runners.

J Athl Train 2021 Jun 15. Epub 2021 Jun 15.

Gait & Motion Analysis Laboratory, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong.

Context: There are three common foot strike techniques in runners. Whether these techniques generate different sounds at the point of impact with the ground may influence lower limb kinetics. No previous studies have determined whether such relationships exist. Read More

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Low Carbon Footprint Recycling of Post-Consumer PET Plastic with a Metagenomic Polyester Hydrolase.

ChemSusChem 2021 Jun 15. Epub 2021 Jun 15.

Leipzig University: Universitat Leipzig, Department of Chemistry and Mineralogy, GERMANY.

Our planet is flooded with plastics and the need for sustainable recycling strategies of polymers has become increasingly urgent. Enzyme-based hydrolysis of post-consumer plastic is an emerging strategy for closed-loop recycling of polyethylene terephthalate (PET). The polyester hydrolase PHL7 isolated from a compost metagenome completely hydrolyzed amorphous PET films, releasing 91 mg of terephthalic acid per hour and mg of enzyme. Read More

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A new optical coherence tomography method for subfoveal choroidal thickness measurement: A single-center observational study.

Medicine (Baltimore) 2021 Jun;100(24):e26355

Department of Ophthalmology, Keimyung University School of Medicine, Keimyung University Dongsan Hospital, Daegu, Republic of Korea.

Abstract: Several macular pathologies are associated with choroidal vascular supply and thus require choroidal thickness evaluation. However, there is no standard subfoveal choroidal thickness (SFCT) measurement method. This study investigated a new method of SFCT measurement, using optical coherence tomography. Read More

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Immediate Reconstruction of Large Ptotic Breasts following Vertical Reduction Pattern Nipple-Sparing Mastectomy.

J Breast Cancer 2021 Apr 29. Epub 2021 Apr 29.

Department of Plastic and Reconstructive Surgery, Korea University Medical Center, Seoul, Korea.

Purpose: Women with large and/or ptotic breasts are generally not considered candidates for nipple-sparing mastectomy because of concerns regarding the high incidence of postoperative complications including ischemic complications. Therefore, we adopted a vertical skin resection technique for nipple-sparing mastectomy, and obtained satisfactory results following immediate autologous breast reconstruction. In this study, we aimed to describe our operative technique and review its outcomes. Read More

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Measurements of exhaled airflow velocity through human coughs using particle image velocimetry.

Build Environ 2021 Jun 9:108020. Epub 2021 Jun 9.

School of Engineering, The University of Tokyo, Tokyo, Japan.

The sudden outbreak of coronavirus (COVID-19) has infected over 100 million people and led to over two million deaths (data in January 2021), posing a significant threat to global human health. As a potential carrier of the novel coronavirus, the exhaled airflow of infected individuals through coughs is significant in virus transmission. The research of detailed airflow characteristics and velocity distributions is insufficient because most previous studies utilize particle image velocimetry (PIV) with low frequency. Read More

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Thermal injury induces early blood vessel occlusion in a porcine model of brass comb burn.

Sci Rep 2021 Jun 14;11(1):12457. Epub 2021 Jun 14.

Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, 301 University Boulevard, Galveston, TX, 77555-0647, USA.

Burn wound progression is an important determinant of patient morbidity and mortality after injury. In this study, we used the brass comb contact burn to determine burn wound vertical injury progression with a focus on blood vessel occlusion and endothelial cell death. Class A 3-month-old Yorkshire pigs received a brass comb contact burn. Read More

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Prevalence of malocclusion and assessment of orthodontic treatment needs among Syrian refugee children and adolescents: a cross-sectional study.

BMC Oral Health 2021 Jun 14;21(1):305. Epub 2021 Jun 14.

Restorative Dentistry, Division of Dentistry, School of Medical Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.

Background: There is a scarcity of data concerning the prevalence and pattern of malocclusion and orthodontic treatment needs in Syrian refugee. In this study, extra and intra-oral features of malocclusion and the dental health component of the Index of Orthodontic Treatment Need (IOTN) were reported.

Methods: Examination of 606 Syrian children/adolescents refugees attending Zaatari clinic was carried out (males = 280, females = 326, mean age = 11. Read More

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Rare earth element migration and impact of Dicranopteris dichotoma at mines in south China.

Chemosphere 2021 Sep 31;278:130433. Epub 2021 Mar 31.

State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province, Fujian Normal University, Fuzhou, Fujian, China; Institute of Geography, Fujian Normal University, Fuzhou, Fujian, China; School of Geographical Sciences, Fujian Normal University, Fuzhou, Fujian, China.

The migration of rare earth elements (REEs) has a major influence on the environment. However, little is known about REEs migration control by Dicranopteris dichotoma at REEs mines. Therefore, this study examined the horizontal and vertical migration of REEs using artificial rainfall and naive soil column experiments, respectively, and the REEs migration control of Dicranopteris dichotoma at REEs mines in south China. Read More

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September 2021

Chemical control of competing electron transfer pathways in iron tetracyano-polypyridyl photosensitizers.

Chem Sci 2020 Apr 16;11(17):4360-4373. Epub 2020 Apr 16.

Stanford PULSE Institute, SLAC National Accelerator Laboratory, Stanford University Menlo Park California 94025 USA

Photoinduced intramolecular electron transfer dynamics following metal-to-ligand charge-transfer (MLCT) excitation of [Fe(CN)(2,2'-bipyridine)] (), [Fe(CN)(2,3-bis(2-pyridyl)pyrazine)] () and [Fe(CN)(2,2'-bipyrimidine)] () were investigated in various solvents with static and time-resolved UV-Visible absorption spectroscopy and Fe 2p3d resonant inelastic X-ray scattering (RIXS). This series of polypyridyl ligands, combined with the strong solvatochromism of the complexes, enables the MLCT vertical energy to be varied from 1.64 eV to 2. Read More

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Shape-directed self-assembly of nanodumbbells into superstructure polymorphs.

Chem Sci 2020 Mar 27;11(16):4065-4073. Epub 2020 Mar 27.

Department of Chemistry, Shenzhen Engineering Research Center for Frontier Materials Synthesis at High Pressures, Southern University of Science and Technology (SUSTech) Shenzhen Guangdong 518055 China

Self-assembly of colloidal nanoparticles into ordered superstructures provides a promising route to create novel/enhanced functional materials. Much progress has been made in self-assembly of anisotropic nanoparticles, but the complexity and tunability of superstructures remain restricted by their available geometries. Here we report the controlled packing of nanodumbbells (NDs) with two spherical lobes connected by one rod-like middle bar into varied superstructure polymorphs. Read More

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Impacts of global warming on marine microbial communities.

Sci Total Environ 2021 May 21;791:147905. Epub 2021 May 21.

Sathyabama Institute of Science and Technology, Chennai 600119, Tamil Nadu, India; School of Medicine, Loma Linda University, CA, USA; Musculoskeletal Disease Research Laboratory, US Department of Veteran Affairs, Loma Linda, CA, USA. Electronic address:

Global warming in ocean ecosystems alters temperature, acidification, oxygen content, circulation, stratification, and nutrient inputs. Microorganisms play a dominant role in global biogeochemical cycles crucial for a planet's sustainability. Since microbial communities are highly dependent on the temperature factor, fluctuations in the same will lead to adverse effects on the microbial community organization. Read More

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Engineering a 3D collective cancer invasion model with control over collagen fiber alignment.

Biomaterials 2021 Jun 4;275:120922. Epub 2021 Jun 4.

Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, United States; Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States. Electronic address:

Prior to cancer cell invasion, the structure of the extracellular matrix (ECM) surrounding the tumor is remodeled, such that circumferentially oriented matrix fibers become radially aligned. This predisposed radially aligned matrix structure serves as a critical regulator of cancer invasion. However, a biomimetic 3D model recapitulating a tumor's behavioral response to these ECM structures is not yet available. Read More

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Diverse symbiovars nodulating cowpea (Vigna unguiculata L. Walp.) in highly adaptable agro-ecological zones in Mozambique.

Syst Appl Microbiol 2021 May 26;44(4):126220. Epub 2021 May 26.

Department of Chemistry, Tshwane University of Technology, South Africa. Electronic address:

The presence of effective microsymbionts in the soil and their compatibility with the host plant are the key determinants to the N fixation process. In Sub-Saharan Africa, nitrogen fixation in locally adapted cowpea and the distribution of their symbiovars are not well understood. The Aim of the study was to assess the distribution and symbiotic phylogenetic position of cowpea microsymbionts. Read More

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Relationship between vertical stratification and feeding habits of mosquito (Diptera: Culicidae) assemblages collected in conservation units in the green belt of the city of São Paulo, Brazil.

Acta Trop 2021 Jun 11:106009. Epub 2021 Jun 11.

Department of Epidemiology, School of Public Health, University of São Paulo, São Paulo, SP, Brazil. Electronic address:

São Paulo is one of the largest cities in the world and has several characteristics that favor a diversity of urban and wild mosquitoes. Little is known about how variations in mosquito diversity and feeding preferences for different hosts in different vegetation strata can influence the risk of pathogen transmission to humans. We investigated vertical stratification of mosquitoes and its relationship with vertebrate hosts in environments with different degrees of conservation in two conservation units in the city of São Paulo. Read More

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Three-Dimensional Perovskite Nanopixels for Ultrahigh-Resolution Color Displays and Multilevel Anticounterfeiting.

Nano Lett 2021 Jun 14. Epub 2021 Jun 14.

Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China.

Hybrid perovskites are emerging as a promising, high-performance luminescent material; however, the technological challenges associated with generating high-resolution, free-form perovskite structures remain unresolved, limiting innovation in optoelectronic devices. Here, we report nanoscale three-dimensional (3D) printing of colored perovskite pixels with programmed dimensions, placements, and emission characteristics. Notably, a meniscus comprising femtoliters of ink is used to guide a highly confined, out-of-plane crystallization process, which generates 3D red, green, and blue (RGB) perovskite nanopixels with ultrahigh integration density. Read More

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Toward an Accurate Description of Low-Lying Singlet Excited States of Polyenes.

J Chem Theory Comput 2021 Jun 14. Epub 2021 Jun 14.

Department of Chemistry, Lomonosov Moscow State University, Moscow, 119991, Russia.

The low-lying excited states of carotenoids play a crucial role in many important biophysical processes such as photosynthesis. Most of these excited states are strongly correlated, which makes them both challenging for a qualitative description and an engaging model system for trying out emerging multireference methods. Among these methods, driven similarity renormalization group (DSRG) and its perturbative version (DSRG-MRPT2) are especially attractive in terms of both accuracy and moderate numerical complexity. Read More

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Massive Pontine Hemorrhage by Dual Injection of Autologous Blood.

J Vis Exp 2021 May 29(171). Epub 2021 May 29.

The Second Affiliated Hospital of Guangzhou Medical University;

We provide a protocol to establish a massive pontine hemorrhage model in a rat. Rats weighing about 250 grams were used in this study. One hundred microliters of autologous blood was taken from the tail vein and stereotaxically injected into the pons. Read More

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Complicated Postoperative Flat Back Deformity Correction With the Aid of Virtual and 3D Printed Anatomical Models: Case Report.

Front Surg 2021 28;8:662919. Epub 2021 May 28.

Department of Industrial Engineering, Alma Mater Studiorum, Universita di Bologna, Bologna, Italy.

The number of patients with iatrogenic spinal deformities is increasing due to the increase in instrumented spinal surgeries globally. Correcting a deformity could be challenging due to the complex anatomical and geometrical irregularities caused by previous surgeries and spine degeneration. Virtual and 3D printed models have the potential to illuminate the unique and complex anatomical-geometrical problems found in these patients. Read More

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Effects of COVID-19 on Pregnant women: Evidence-based review.

J Family Med Prim Care 2021 Apr 29;10(4):1530-1533. Epub 2021 Apr 29.

Department of Medicine, AIIMS, Bibinagar, Hyderabad, Telangana, India.

Corona virus infection (COVID-19) is increasing exponentially globally. It is also affecting pregnant women among others. Complications arising during pregnancy because of COVID-19 must be considered a health issue. Read More

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Noncontact Knee Ligament Injury Prevention Screening in Netball: A Clinical Commentary with Clinical Practice Suggestions for Community-Level Players.

Authors:
Nicholas C Clark

Int J Sports Phys Ther 2021 Jun 1;16(3):911-929. Epub 2021 Jun 1.

University of Essex.

Netball is a predominantly female team court-sport which is played worldwide. Netball is becoming more popular in the United States following its countrywide introduction to schools and community centers. A unique characteristic of netball is the footwork rule which restricts players to a one-step landing after catching the ball. Read More

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Recommendations for Plyometric Training after ACL Reconstruction - A Clinical Commentary.

Int J Sports Phys Ther 2021 Jun 1;16(3):879-895. Epub 2021 Jun 1.

Education & Research Department, Isokinetic Medical Group, FIFA Medical Centre of Excellence, Bologna, Italy.

This paper presents a four-stage plyometric program to be undertaken as part of criterion-based rehabilitation for athletes with anterior cruciate ligament reconstruction (ACLR). After ACLR, the patient experiences alterations of joint mobility, gait and movement patterns, neuromuscular function and general physical fitness. Plyometric training is an important component for neuromuscular and movement re-conditioning after ACLR. Read More

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Female Adolescent Soccer Players Utilize Different Neuromuscular Strategies Between Limbs During the Propulsion Phase of a Lateral Vertical Jump.

Int J Sports Phys Ther 2021 Jun 2;16(3):695-703. Epub 2021 Jun 2.

Northwestern University.

Background: Multiplanar dynamic stability is an important unilateral function in soccer performance but has been scarcely examined in female soccer players. The lateral vertical jump task assesses unilateral functional performance, and energy generation contribution examines how each joint (hip, knee, ankle) contributes to the vertical component of the vertical jump phase to measure inter- and intra-limb differences.

Purpose: To examine dominant versus non-dominant limb performance using energy generation contribution of the hip, knee, and ankle during the vertical jump component of the lateral vertical jump. Read More

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