Effective temperatures of hot Brownian motion

We derive generalized Langevin equations for the translational and rotational motion of a heated Brownian particle from the fluctuating hydrodynamics of its non-isothermal solvent. The temperature gradient around the particle couples to the hydrodynamic modes excited by the particle itself so that the resulting noise spectrum is governed by a frequency-dependent temperature. We show how the effective temperatures at which the article coordinates and (angular) velocities appear to be thermalized emerge from this central quantity.Comment: 11 pages, 4 figure

Generalised Einstein Relation for Hot Brownian Motion

The Brownian motion of a hot nanoparticle is described by an effective Markov theory based on fluctuating hydrodynamics. Its predictions are scrutinized over a wide temperature range using large-scale molecular dynamics simulations of a hot nanoparticle in a Lennard-Jones fluid. The particle positions and momenta are found to be Boltzmann distributed according to distinct effective temperatures $T_\mathrm{HBM}$ and $T_\mathrm{k}$ . For $T_\mathrm{HBM}$ we derive a formally exact theoretical prediction and establish a generalised Einstein relation that links it to directly measurable quantities

Hot Brownian Motion

We derive the generalized Markovian description for the non-equilibrium Brownian motion of a heated particle in a simple solvent with a temperature-dependent viscosity. Our analytical results for the generalized fluctuation-dissipation and Stokes-Einstein relations compare favorably with measurements of laser-heated gold nano-particles and provide a practical rational basis for emerging photothermal technologies.Comment: 10 pages, 5 figure

Survey of the Moths (Lepidoptera) Inhabiting the Funk Bottoms Wildlife Area, Wayne and Ashland Counties, Ohio

Author Institution: Department of Entomology, Ohio Agricultural Research and Development Center, The Ohio State UniversityIn 1995, the Funk Bottoms Wildlife Area was the subject of an ongoing series of insect surveys intended to establish benchmark information on arthropod diversity of wetlands in northeast Ohio. This article concentrates on the moths which were collected at ultraviolet light traps within the Funk Bottoms Wildlife Area. A companion report will follow focusing on the Coleoptera along with several orders of aquatic insects. 3252 specimens were identified to 306 species in 19 families. These species are classified as follows: Abundant = 34; Locally Abundant = 1; Common = 257; Locally Common = 2; Uncommon = 10; Rare = 1; and Special Interest = 1

A two-species continuum model for aeolian sand transport

Starting from the physics on the grain scale, we develop a simple continuum description of aeolian sand transport. Beyond popular mean-field models, but without sacrificing their computational efficiency, it accounts for both dominant grain populations, hopping (or "saltating") and creeping (or "reptating") grains. The predicted stationary sand transport rate is in excellent agreement with wind tunnel experiments simulating wind conditions ranging from the onset of saltation to storms. Our closed set of equations thus provides an analytically tractable, numerically precise, and computationally efficient starting point for applications addressing a wealth of phenomena from dune formation to dust emission.Comment: 23 pages, 9 figure

Animal movements in the Kenya Rift and evidence for the earliest ambush hunting by hominins

Animal movements in the Kenya Rift Valley today are influenced by a combination of topography and trace nutrient distribution. These patterns would have been the same in the past when hominins inhabited the area. We use this approach to create a landscape reconstruction of Olorgesailie, a key site in the East African Rift with abundant evidence of large-mammal butchery between ~1.2 and ~0.5 Ma BP. The site location in relation to limited animal routes through the area show that hominins were aware of animal movements and used the location for ambush hunting during the Lower to Middle Pleistocene. These features explain the importance of Olorgesailie as a preferred location of repeated hominin activity through multiple changes in climate and local environmental conditions, and provide insights into the cognitive and hunting abilities of Homo erectus while indicating that their activities at the site were aimed at hunting, rather than scavenging

Determinants of bone mineral density in healthy term-born children at age 6 months and 3 years

Background &amp; aims: The first 6 months of life are a critical window for adiposity programming, which could potentially also be true for bone mineral density (BMD) development. It is, however, currently unknown which determinants associate with BMD during early childhood. Our objective was to assess which determinants associate with BMD at 6 months and 3 years of age, with focus on growth during the first 6 months of life and macronutrient intake. Methods: In 428 healthy term-born infants, aged 6 months and 3 years, we measured anthropometrics, BMD total body less head (BMDTBLH) and body composition by Dual-energy X-ray absorptiometry (DXA), and collected feeding characteristics by questionnaires. At age 3 months, macronutrient intake was measured in formula-fed and exclusively breastfed infants using a Human Milk Analyzer. At age 3 years, feeding diaries were analyzed regarding macronutrients and vitamin D intake. Associations of BMDTBLH standard deviation score (SDS) with child characteristics, growth and macronutrient intake were investigated with regression analyses. Results: Reference values for BMDTBLH at age 6 months were constructed. Weight SDS, lean body mass (LBM) and fat mass (FM) associated positively with BMDTBLH SDS at age 6 months. The same variables associated positively with BMDTBLH SDS at age 3 years, with also length SDS. Protein intake at age 3 months associated positively with BMDTBLH SDS at age 6 months, and fat intake at 3 years inversely with BMDTBLH SDS at 3 years. Conclusion: Lean body mass is the most important determinant of BMDTBLH SDS at age 6 months and 3 years. Higher protein intake at age 3 months and lower fat intake at age 3 years associate with higher BMDTBLH SDS.</p

Pharmacological and Parenteral Nutrition-Based Interventions in Microvillus Inclusion Disease

Microvillus inclusion disease (MVID) is a rare inherited and invariably fatal enteropathy, characterized by severe intractable secretory diarrhea and nutrient malabsorption. No cure exists, and patients typically die during infancy because of treatment-related complications. The need for alternative treatment strategies is evident. Several pharmacological interventions with variable successes have been tried and reported for individual patients as part of their clinical care. Unfortunately, these interventions and their outcomes have remained hidden in case reports and have not been reviewed. Further, recent advances regarding MVID pathogenesis have shed new light on the outcomes of these pharmacological interventions and offer suggestions for future clinical research and trials. Hence, an inventory of reported pharmacological interventions in MVID, their rationales and outcomes, and a discussion of these in the light of current knowledge is opportune. Together with a discussion on MVID-specific pharmacokinetic, -dynamic, and -genetic concerns that pose unique challenges regarding pharmacological strategies, we envision that this paper will aid researchers and clinicians in their efforts to develop pharmacological interventions to combat this devastating disease

Anthropometrics and fat mass, but not fat-free mass, are compromised in infants requiring parenteral nutrition after neonatal intestinal surgery

BACKGROUND: Children with intestinal failure (IF) receiving long-term parenteral nutrition (PN) have altered body composition (BC), but data on BC changes from start of PN onwards are lacking. OBJECTIVE: We aimed to assess growth and BC in infants after neonatal intestinal surgery necessitating PN and at risk for IF, and to explore associations with clinical parameters. DESIGN: Prospective cohort study in infants after intestinal surgery. IF was defined as PN-dependency for > 60 days. Standard deviation scores (SDS) for anthropometry were calculated until 6 months corrected age. In a subgroup, fat mass (FM) and fat-free mass (FFM) were measured with air-displacement plethysmography at 2- and 6-months corrected age. SDS for length-adjusted FM index and FFM index were calculated. Associations between cumulative amount of PN and BC parameters were analyzed with linear mixed-effect models. RESULTS: Ninety-five neonates were included (54% male, 35% born < 32 weeks). Thirty-nine infants (41%) had IF. Studied infants had compromised anthropometric parameters during follow-up. At 6 months corrected age, they remained smaller (median weight-for-age SDS -0.9 [interquartile range -1.5, 0.1], P < 0.001) than the normal population. In 57 infants, 93 BC measurements were performed. FM index SDS was lower than in healthy infants at 2- and 6-months corrected age (-0.9 [-1.6, -0.3], P < 0.001 and -0.7 [-1.3, 0.1], P = 0.001, respectively), but FFM index SDS did not differ. A higher cumulative amount of PN predicted higher FM index in female infants but lower FM index in male infants. CONCLUSIONS: In this cohort of infants receiving PN after intestinal surgery, compromised anthropometrics, decreased FM and adequate FFM were observed during the first 6 months. Male and female infants seemed to respond differently to PN when it comes to FM index. Continuing growth monitoring after 6 months of age is strongly recommended, while further research should explore the benefit of incorporating ongoing BC monitoring during follow-up.Clinical Trial Registration: Dutch Trial Register NTR6080, https://www.trialregister.nl/trial/5892