Establishing that climate exerts an important general influence on topography in tectonically active settings has proven an elusive goal. Here, we show that climates ranging from arid to humid consistently influence fluvial erosional efficiency and thus topography, and this effect is captured by a simple metric that combines channel steepness and mean annual rainfall, . Accounting for spatial rainfall variability additionally increases the sensitivity of channel steepness to lithologic and tectonic controls on topography, enhancing predictions of erosion and rock uplift rates, and supports the common assumption of a reference concavity near 0.
View Article and Find Full Text PDFThe lack of evidence for large-scale glacial landscapes on Mars has led to the belief that ancient glaciations had to be frozen to the ground. Here we propose that the fingerprints of Martian wet-based glaciation should be the remnants of the ice sheet drainage system instead of landforms generally associated with terrestrial ice sheets. We use the terrestrial glacial hydrology framework to interrogate how the Martian surface gravity affects glacial hydrology, ice sliding, and glacial erosion.
View Article and Find Full Text PDFUnderstanding of the relationships between tectonic deformation and exhumation in the Himalaya remains incomplete, especially at the ends of the chain.
View Article and Find Full Text PDFThe establishment of continental-scale drainage systems on Earth is largely controlled by topography related to plate boundary deformation and buoyant mantle. Drainage patterns of the great rivers in Asia are thought to be highly dynamic during the Cenozoic collision of India and Eurasia, but the drainage pattern and landscape evolution prior to the development of high topography in eastern Tibet remain largely unknown. Here we report the results of petro-stratigraphy, heavy-mineral analysis, and detrital zircon U-Pb dating from late Cretaceous-early Palaeogene sedimentary basin strata along the present-day eastern margin of the Tibetan Plateau.
View Article and Find Full Text PDFThe ongoing debate about the nature of coupling between climate and tectonics in mountain ranges derives, in part, from an imperfect understanding of how topography, climate, erosion, and rock uplift are interrelated. Here, we demonstrate that erosion rate is nonlinearly related to fluvial relief with a proportionality set by mean annual rainfall. These relationships can be quantified for tectonically active landscapes, and calculations based on them enable estimation of erosion where observations are lacking.
View Article and Find Full Text PDFAn adult dog was presented for chronic cough and a recent development of ulcerated, erythematous nares with nasal discharge. Cytology of enlarged peripheral lymph nodes revealed many intracellular and extracellular organisms. These round or rarely oval organisms measured approximately 5-9 µm in diameter and frequently contained several globular structures, ranging from deeply basophilic to magenta.
View Article and Find Full Text PDFBackground: The accuracy of laboratory data is of utmost importance. Data regarding laboratory error in human laboratories are often extrapolated into veterinary settings. One study investigated the rate and type of errors in a European commercial veterinary laboratory, but that data might not directly apply to an educational setting.
View Article and Find Full Text PDFAn 8-year-old, neutered male Labrador Retriever presented with acute forelimb lameness. Clinical signs progressed over one week. On physical examination, right cubital joint effusion and bilateral axillary lymphadenomegaly were noted, and severe internal lymphadenomegaly was observed ultrasonographically.
View Article and Find Full Text PDFJ Acad Ophthalmol (2017)
January 2019
Importance: Interest is growing in targeting physician attire to improve the patient experience. Few studies in ophthalmology have examined patient preferences for physician attire.
Objective: To understand patient preferences for physician attire in ophthalmology practices in the United States.
To meet Council on Education for Public Health (CEPH) accreditation standards for a standalone undergraduate public health program, faculty at the University of North Carolina Wilmington conducted a matrix exercise to assess curricular alignment with the CEPH Domains of Public Health (PHDs) and the National Commission for Health Education Credentialing (NCHEC) competencies. Addressing gaps in the undergraduate public health program identified by the matrix exercise drove development of a new course, Public Health Practice. The course was designed to use real world experience to provide students with the tools and skills needed for the practice of public health.
View Article and Find Full Text PDFThyroid-related orbitopathy (TRO) is a common and recognizable manifestation of Graves' disease, caused by an increase in orbital fat volume, increased extraocular muscle diameter, and fibrosis. Together, within the bony confines of the orbit, these changes might alter the shape and position of the globe, potentially inducing refractive shifts. These refractive changes may then be affected by corrective surgical interventions for TRO such as orbital decompression and strabismus surgery.
View Article and Find Full Text PDFOphthalmic Plast Reconstr Surg
March 2017
Glomuvenous malformations (GVMs), previously referred to as glomus tumors or glomangiomas, are benign, mesenchymal venous malformations arising from glomus bodies. Glomus bodies are modified smooth muscle neuromyoarterial structures involved in temperature regulation via blood shunting. These classically occur in the digits but can occur in other locations.
View Article and Find Full Text PDFOphthalmic Plast Reconstr Surg
February 2017
Purpose: Blow-out fractures cause expansion of the bony orbital walls and prolapse of orbital contents in the sinuses. This can result in diplopia, enophthalmos, and hypoglobus. Early surgical repair has been previously recommended, however, recent reports show that delayed surgery can also be effective.
View Article and Find Full Text PDFOphthalmic Plast Reconstr Surg
June 2014
Purpose: Dacryocystorhinostomy (DCR) is the standard procedure for the treatment of acquired nasolacrimal duct obstruction (NLDO) that can be performed through an external or endonasal approach. Both techniques create a fistula from the lacrimal sac into the nasal cavity via a bony osteotomy. Historically, external DCR has been considered the gold standard; however, recent reports suggest endonasal DCR is an effective alternative.
View Article and Find Full Text PDFPurpose: Spontaneous superior ophthalmic vein thrombosis (SOVT) is a rare entity. We describe three patients with spontaneous ophthalmic vein thrombosis, each with various risk factors.
Patients And Methods: A retrospective review of three patients with a diagnosis of superior ophthalmic vein thrombosis.
A 42-year-old man presented with right-sided epiphora, a fleshy lesion emanating from the right inferior punctum and a painless mass below the medial canthal tendon. Biopsy of the lacrimal sac mass disclosed papillary squamous cell carcinoma in situ. The patient underwent wide local excision with clear surgical margins and remained disease free until 28 months later when he returned with hemorrhagic epiphora of the OS and fullness overlying the left lacrimal sac.
View Article and Find Full Text PDFFacial Plast Surg Clin North Am
November 2013
The goal of this article is to enhance the surgical precision and accuracy of surgeons performing upper and lower eyelid blepharoplasty. The most common blepharoplasty complications are described and how to avoid them is discussed in detail. Complications range from mild to severe and for each, preoperative measures to prevent, perioperative measures to avoid, and postoperative measures to minimize complications are detailed.
View Article and Find Full Text PDFRetrobulbar hemorrhage is a feared potentially sight threatening complication after orbital decompression surgery. We present a patient, 36 hours after surgery, while forcefully biting, suddenly developed a retrobulbar hemorrhage arising from the temporalis muscle causing an orbital compartment syndrome. Rapid intervention with canthotomy and cantholysis was associated with recovery of vision from absent light perception to 20/20.
View Article and Find Full Text PDFA 43-year-old man was struck in the left orbit with his board while surfing and sustained a 3-cm laceration above his left eyebrow. The laceration was sutured closed primarily at a local emergency room. When he presented to UCSD oculoplastics for suture removal, he complained of diplopia with upgaze and was found to have hypoglobus on clinical exam.
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