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https://www.readbyqxmd.com/read/28743156/components-of-mesophyll-resistance-and-their-environmental-responses-a-theoretical-modeling-analysis
#1
Yi Xiao, Xin-Guang Zhu
Mesophyll resistance (rm ), together with stomatal resistance and biochemical limitations, are recognized as three critical factors limiting leaf photosynthesis. Contrary to the expectation of being a constant, rm not only varies with light and CO2 conditions but also shows different responses among species. To elucidate the mechanistic basis of these responses, we derived an analytical model of rm , which incorporates various anatomical and biochemical factors including permeabilities of cell wall and chloroplast envelope to CO2 and HCO3(-) , carbonic anhydrase activities in cytosol and stroma, Rubisco activities, and relative location of mitochondria and chloroplast...
July 25, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28742787/functional-outcomes-of-elderly-patients-with-nonoperatively-treated-acetabular-fractures-that-meet-operative-criteria
#2
Scott P Ryan, Theodore T Manson, Marcus F Sciadini, Jason W Nascone, Christopher T LeBrun, Renan C Castillo, Ragu Muppavarapu, Brian Schurko, Robert V O'Toole
OBJECTIVES: To report functional outcomes of displaced acetabular fractures treated nonoperatively in the geriatric patient population. DESIGN: Retrospective case series. SETTING: Two Level I trauma centers. PATIENTS: Twenty-seven patients age 60 years or older who sustained displaced acetabular fractures during an 11-year period. INTERVENTION: Nonoperative treatment. MAIN OUTCOME MEASUREMENTS: Primary outcome measurements were Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) scores and Short Form 8 (SF-8) scores...
July 24, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28742784/treatment-and-complications-of-patients-with-ipsilateral-acetabular-and-femur-fractures-a-multicenter-retrospective-analysis
#3
Justin M Hire, Preston J Boyer, Heidi Israel, Lisa K Cannada, Hassan Mir, Jason Halvorson, Gregory J Della Rocca, Bryan Ming, Brian Mullis, Chetan Deshpande
OBJECTIVES: The purpose of this study was to review the treatment of ipsilateral acetabular and femur fracture patients to provide descriptive demographic data, injury pattern classification, treatment and evaluate the complication profile reflective of current practices. STUDY DESIGN: Multicenter retrospective cohort. SETTING: Eight Level 1 Trauma Centers. PATIENTS/PARTICIPANTS: 101 patients met inclusion criteria. INTERVENTION: Surgical treatment of both the acetabular and femur fracture...
July 24, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28742679/delayed-treatment-of-a-posterior-cruciate-ligament-tibial-insertion-avulsion-fracture-in-a-child-with-open-physis-a-case-report-with-a-4-year-follow-up
#4
Tales M Guimarães, Paulo V P Helito, Fabio J Angelini, Marco K Demange, José R Pécora, Camilo P Helito
Posterior cruciate ligament avulsion fracture from its tibial insertion is a rare pathology in children. It is usually caused by high-energy traumas and its diagnosis is not always easy. Late diagnosis leads to late treatment, which can result in suboptimal results. We present a case of a 13-year-old boy hit by a car, who had a delay in diagnosis and treatment because of severe head trauma. The patient was treated 4 months after the trauma with open reduction and internal fixation of the avulsion fracture. After 4 years of follow-up, he has no complaints and has achieved good functional outcome...
September 2017: Journal of Pediatric Orthopedics. Part B
https://www.readbyqxmd.com/read/28742610/near-point-of-convergence-and-gait-deficits-in-adolescents-after-sport-related-concussion
#5
David R Howell, Michael J OʼBrien, Aparna Raghuram, Ankoor S Shah, William P Meehan
OBJECTIVE: To prospectively examine gait characteristics of participants acutely after concussion with and without receded near point of convergence (NPC), compared with healthy controls. DESIGN: Cross-sectional study. SETTING: Sports-medicine clinic. PARTICIPANTS: Patients examined after concussion (n = 33; mean ± SD = 7.2 ± 3.1 days) and a group of uninjured athletes (n = 31) completed a Postconcussion Symptom Scale, underwent NPC testing, and single/dual-task gait assessments...
July 21, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28742096/insecticide-resistance-is-mediated-by-multiple-mechanisms-in-recently-introduced-aedes-aegypti-from-madeira-island-portugal
#6
Gonçalo Seixas, Linda Grigoraki, David Weetman, José Luís Vicente, Ana Clara Silva, João Pinto, John Vontas, Carla Alexandra Sousa
BACKGROUND: Aedes aegypti is a major mosquito vector of arboviruses, including dengue, chikungunya and Zika. In 2005, Ae. aegypti was identified for the first time in Madeira Island. Despite an initial insecticide-based vector control program, the species expanded throughout the Southern coast of the island, suggesting the presence of insecticide resistance. Here, we characterized the insecticide resistance status and the underlying mechanisms of two populations of Ae. aegypti from Madeira Island, Funchal and Paúl do Mar...
July 24, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28742073/biological-nitrogen-fixation-in-the-oxygen-minimum-region-of-the-eastern-tropical-north-pacific-ocean
#7
Amal Jayakumar, Bonnie X Chang, Brittany Widner, Peter Bernhardt, Margaret R Mulholland, Bess B Ward
Biological nitrogen fixation (BNF) was investigated above and within the oxygen-depleted waters of the oxygen-minimum zone of the Eastern Tropical North Pacific Ocean. BNF rates were estimated using an isotope tracer method that overcame the uncertainty of the conventional bubble method by directly measuring the tracer enrichment during the incubations. Highest rates of BNF (~4 nM day(-1)) occurred in coastal surface waters and lowest detectable rates (~0.2 nM day(-1)) were found in the anoxic region of offshore stations...
July 25, 2017: ISME Journal
https://www.readbyqxmd.com/read/28741411/intraoperative-evaluation-of-the-effects-of-femoral-component-offset-and-head-size-on-joint-stability-in-total-hip-arthroplasty
#8
Tetsuya Jinno, Daisuke Koga, Yoshinori Asou, Sadao Morita, Atsushi Okawa, Takeshi Muneta
PURPOSE: To evaluate intraoperatively the effects of femoral offset and head size on stability of the hip joints in total hip arthroplasty (THA) via posterior approach. METHODS: Thirty cementless THAs were included in this study. After acetabular shell and femoral broach fixation, trial reduction was repeated using a femoral neck (5- to 8-mm higher or standard offset) and a head (26 mm or 32 mm). To evaluate joint stability, range of internal rotation (IR) in hip flexion prior to posterior subluxation and range of external rotation (ER) in hip extension were measured...
January 1, 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28741327/-prescription-pattern-in-the-management-of-type-i-open-forearm-fractures-in-pediatric-patients
#9
J A López-Tello, B J Torres-Fernández, N G Escalona-Reynoso
BACKGROUND: Pediatric open fractures account for more tan 10% of hospital admissions in a Pediatric Trauma Clinical Department. It is important to identify the predominant surgical management prescription pattern in pediatric patients presenting with Type I open forearm fractures at a referral center in an emerging economy. MATERIAL AND METHODS: Observational, cross-sectional, analytical, secondary-source (logs) sampling study of consecutive cases. The cases included subjects under 17 years of age presenting with Type I open forearm fractures at a Pediatric Trauma Clinical Department from January 1st, 2009 to December 31st, 2013...
January 2017: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/28741323/-osteosynthesis-with-locking-plate-and-minimally-invasive-technique-for-proximal-humeral-fractures
#10
C Arroyo-Sánchez, C Abril-Gaona, D Rincón-Cardozo
OBJECTIVE: To report our experience in the treatment of 2-3 fragment proximal humeral fractures using a minimally invasive technique that involves an angular-stable locking implant and find out the factors affecting patients outcomes. MATERIAL AND METHODS: Descriptive, prospective study of the case series type. Twenty-two patients, 13 females and 9 males, were operated on between February 2010 and August 2012. Mean age was 50.8 years (24-82 years). Patients were placed in a beach-chair position...
January 2017: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/28741148/simultaneous-navigated-cervico-thoracic-and-thoraco-lumbar-fixation
#11
Krunal Patel, Tamara Tajsic, Karol P Budohoski, Mathew R Guilfoyle, Rikin A Trivedi
STUDY DESIGN: Case report. OBJECTIVE: To investigate the feasibility of using two independent image guidance systems to simultaneously fix multiple segment spine fractures. Image guidance is increasingly used to aid spinal fixation. We describe the first use of multiple navigation systems during a single procedure allowing for multi-segment spinal fixations to be performed simultaneously and capitalizing the advantages of navigation. METHOD: Two Medtronic Stealth Station S7™ systems with O-arm image capture were used to guide fixation of C6 and T12, unstable, AO A4, three-column fractures, in a patient with ankylosing spondylitis...
July 24, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28740797/pain-management-in-abdominal-wall-reconstruction
#12
Ibrahim Khansa, Andrew Koogler, Jesse Richards, Richard Bryant, Jeffrey E Janis
BACKGROUND: In abdominal wall reconstruction, adequate pain control and minimization of narcotic consumption are essential to improving patient outcomes and satisfaction. Previous studies have examined the role of individual strategies, such as neuraxial analgesia and multimodal analgesia. However, there has not been a study that examined all potential determinants of postoperative narcotic requirements, including intraoperative strategies. METHODS: Consecutive patients who underwent abdominal wall reconstruction were reviewed...
June 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28740524/a-comparison-of-two-fixation-methods-for-femoral-trochanteric-fractures-a-new-generation-intramedullary-system-vs-sliding-hip-screw
#13
Christian Carulli, Federico Piacentini, Tommaso Paoli, Roberto Civinini, Massimo Innocenti
INTRODUCTION: Trochanteric fractures are frequent and generally associated with bone fragility. There is still debate on the best fixation device to treat stable or rather stable trochanteric fractures: we report our clinical and radiological results of fixation with Proximal Femoral Nail "antirotation" (PFNa) in a population of patients compared to a control group treated by Sliding Hip Screw (SHS). MATERIALS AND METHODS: A prospective study was conducted in 71 consecutive patients treated by PFNa (group A), and 69 by a SHS (group B), with a mean age of 81...
January 2017: Clinical Cases in Mineral and Bone Metabolism
https://www.readbyqxmd.com/read/28740359/a-new-lens-for-observing-fundus-with-a-noncontact-wide-angle-viewing-system
#14
Mihori Kita, Yukiko Fujii, Sachiyo Hama
Drying of the cornea during surgery, which causes poor visibility of the fundus, is one of the most serious problems when using a noncontact-type wide-angle viewing system. This study used a newly commercialized lens for observing the fundus with a noncontact wide-angle viewing system. The lens used has a very thin meniscus made of polymethyl methacrylate and a large outer diameter. Following the application of viscoelastic material, the lens can be put on the cornea without using a contact lens fixation ring...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28739582/gain-modulation-as-a-mechanism-for-coding-depth-from-motion-parallax-in-macaque-area-mt
#15
HyungGoo R Kim, Dora E Angelaki, Gregory C DeAngelis
Observer translation produces differential image motion between objects that are located at different distances from the observer's point of fixation (motion parallax). However, motion parallax can be ambiguous with respect to depth sign (near vs. far), and this ambiguity can be resolved by combining retinal image motion with signals regarding eye movement relative to the scene. We have previously demonstrated that both extra-retinal and visual signals related to smooth eye movements can modulate the responses of neurons in area MT of macaque monkeys, and that these modulations generate neural selectivity for depth sign...
July 24, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28739517/novel-use-of-the-leksell-gamma-frame-for-stereotactic-biopsy-of-posterior-fossa-lesions-technical-note
#16
Shiro Horisawa, Hiroshi Nakano, Takakzu Kawamata, Takaomi Taira
BACKGROUND: Stereotactic transcerebellar biopsies of brainstem tumors have often been reported. The Leksell frame or Cosman-Roberts-Wells frame is often used in transcerebellar approaches. However, to access lesions via the cerebellum, these frames should be secured as inferiorly on the cranium as possible, which can require exaggerated neck flexion and limit the flexible trajectory to the target. To overcome these disadvantages, we have devised a new way to use the Leksell frame for transcerebellar approaches...
July 21, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28739475/posterior-osteosynthesis-with-monoaxial-lateral-mass-screw-rod-system-for-unstable-c1-burst-fractures
#17
Yin-Shun Zhang, Jian-Xiang Zhang, Qing-Guo Yang, Wei Li, Hui Tao, Cai-Liang Shen
BACKGROUND CONTEXT: Surgical treatment for unstable atlas fractures has evolved in recent decades from C1-C2 or C0-C2 fusion to motion-preservation techniques of open reduction and internal fixation (ORIF). However, regardless of transoral or posterior approach, the reduction is still not satisfactory. PURPOSE: The article describes and evaluates a new technique for treating the unstable atlas fractures by using a monoaxial screw-rod system. STUDY DESIGN: This is a retrospective study PATIENT SAMPLE: The sample includes adult patients with unstable C1 fractures treated with a posterior monoaxial screw-rod system...
July 21, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28739384/tumor-heterogeneity-determined-with-a-%C3%AE-h2ax-foci-assay-a-study-in-human-head-and-neck-squamous-cell-carcinoma-hhnscc-models
#18
Treewut Rassamegevanon, Steffen Löck, Ursula Range, Mechthild Krause, Michael Baumann, Cläre von Neubeck
PURPOSE: This study aimed to analyze the intra-tumoral heterogeneity of γH2AX foci in tumor specimens following ex vivo radiation to evaluate the potential of γH2AX foci as predictors for radiosensitivity. MATERIAL AND METHODS: γH2AX foci were quantified in tumor specimens of 3hHNSCC tumor models with known differences in radiosensitivity after reoxygenation in culture medium (10h, 24h), single dose exposure (0Gy, 4Gy), and fixation 24h post-irradiation. Multiple, equally treated samples of the same tumor were analyzed for foci, normalized and fitted in a linear mixed-effects model...
July 21, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28739299/surgical-treatment-of-acute-type-v-acromioclavicular-joint-dislocations-in-professional-athletes-an-anatomic-ligament-reconstruction-with-synthetic-implant-augmentation
#19
Ioannis K Triantafyllopoulos, Kalliopi Lampropoulou-Adamidou, Nikitas P Schizas, Eleftherios V Karadimas
BACKGROUND: Most acromioclavicular (AC) joint injuries occur in men in their third decade of life during high-speed or high-impact body contact sports. The management of acute complete AC joint dislocation is surgical. Current surgical techniques include anatomic reconstruction of the main restraints of the AC joint and aim to improve functional outcomes and to reduce the complication rate. METHODS: We present 10 cases of acute type V AC joint dislocation in professional athletes treated surgically with anatomic reconstruction of the coracoclavicular and AC ligaments and augmentation with the use of a synthetic polyester tape...
July 21, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28738936/favorable-outcomes-in-blunt-chest-injury-with-noninvasive-bi-level-positive-airway-pressure-ventilation
#20
Pascal Udekwu, Sahill Patel, Meagan Farrell, Rhonda Vincent
Recent clinical research in patients with blunt chest injury has focused on the benefits of surgical fixation of rib fractures. Noninvasive ventilation (NIV) has been demonstrated to prevent the need for intubation and ventilation in posttraumatic respiratory failure. The preemptive use of NIV in patients with rib fractures has not been extensively studied. Our study evaluated the outcomes of patients with ≥3 rib fractures and hospitalized for ≥ 4 days. Seventy-one patients treated with NIV were compared with 270 patients without NIV...
July 1, 2017: American Surgeon
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