Phonon-phonon interactions in photoexcited graphite studied by ultrafast electron diffraction

We investigated phonon-phonon interactions in photoexcited single-crystalline graphite by ultrafast electron diffraction. Transient electron diffraction profiles from a 35 nm graphite film were observed following laser excitation. Changes in intensities of diffraction spots revealed a two-exponential relaxation process wit

SPECIFICATIONS OF NUTRITION WITH HEALTHY AND PATHOLOGICAL CONDITIONS OF PSORIASIS

Psoriasis is a long-lasting autoimmune disease characterized by patches of abnormal skin. 183 participants in the experiment were selected for the study, half of which are with psoriasis disease. All participants in the study passed the EPIC-Norfolk Food Frequency Questionnaire, which was completed once and included a diet over the past week. The aim of the study was to identify the intakes of different nutrients in two groups by age. AfterquestionnaireFETAtoolwasusedtoanalyzeallanswers (http://www. srl.cam.ac.uk/epic/epicffq/). The output was the results for all nutrients and macro and microelements that are in the food. Significant differences in patients were in eight nutrients, namely: betacarotene, carotene, fructose, potassium, potatoes, fruits, nuts and seeds, and vegetables. All differences are in favor of healthy patients. patients with psoriasis had a diet with low income of fruits and vegetables which brought to the deficiency in some nutrients and vitamins. The used tool for converting food frequency questionnaire data into nutrient and food group values can be used widely for different study populations

STRUCTURAL CHANGES IN THE MICROBIOME IN RATS WITH DSS-INDUCED COLITIS

Microflora plays a critical role in the initiation and development of inflammatory bowel disease (IBD). There are many facts accumulated about the effect of intestinal dysbiosis on the pathogenesis of Crohn’s disease and ulcerative colitis (UC). A biological preparation based on intestinal bacteria can modulate the intestinal normoflora in IBD. We evaluated the effect of the biological drug on rat intestinal microbiome in DSS-induced colitis.Rats were divided into 4 groups: without a colitis model (n = 7); with a colitis model received (n=6); experimental group animals (with a colitis model) received a 10% DSS solution for 7 days, and biology product intragastrically at a dose of 500 mg/kg body weight once per day for 7 days (n = 7); comparison group animals (with a colitis model) received a 10% DSS solution for 7 days and as a treatment the 5-ASA (5-aminosalicylic acid) intragastrically at a dose of 100 mg / kg of animal body weight once for 7 days (n = 6). In our work, we found a decrease in bactericides after 7 days of 10% DSS. An increased in the biodiversity index in the control group is associated with an increase in the following genera: Murimonas, Victivallales, Anaerofustis and etc. Wang W. et. al. shows a decrease in the number of Lactobacillus and Bifidobacteria were significantly reduced in DSS-induced colitis. In our study, the use of biological product show to the partial restoration of certain types of intestinal bacteria such as gram-positive Clostridium XVIII, Faecalibacterium, gram-negative Microbacter, Phascolarctobacterium producing SCFAs, etc

Photoluminescent properties of single crystal diamond microneedles

Single crystal needle-like diamonds shaped as rectangular pyramids were produced by combination of chemical vapor deposition and selective oxidation with dimensions and geometrical characteristics depending on the deposition process parameters. Photoluminescence spectra and their dependencies on wavelength of excitation radiation reveal presence of nitrogen- and silicon-vacancy color centers in the diamond crystallites. Photoluminescence spectra, intensity mapping, and fluorescence lifetime imaging microscopy indicate that silicon-vacancy centers are concentrated at the crystallites apex while nitrogen-vacancy centers are distributed over the whole crystallite. Dependence of the photoluminescence on excitation radiation intensity demonstrates saturation and allows estimation of the color centers density. The combination of structural parameters, geometry and photoluminescent characteristics are prospective for advantageous applications of these diamond crystallites in quantum information processing and optical sensing.Authors are grateful for financial support from Russian Federation President Program for young scientist: Grant# МК-9230.2016.2 (for EAO and FTT) and Grant# MK-5860.2016.2 (for KGK).Peer reviewe

EFFECT OF MARE’S MILK PREBIOTIC SUPPLEMENTATION ON THE GUT MICROBIOME AND THE IMMUNE SYSTEM DURING AND AFTER ANTIBIOTIC THERAPY

Antibiotic treatment can severely affect the gut microbiome with short-term and long-term consequences. Probiotic and prebiotic supplements are widely prescribed to modulate the composition and function of the human gut microbiome. The current study aims to determine the impacts of mare’s milk prebiotic on the diversity of gut bacterial communities and the local immune system when administered during and after a course of antibiotic therapy. Six children aged 4 to 5 years diagnosed with bilateral bronchopneumonia were prescribed cephalosporin (Cefuroxime) antibiotics. During the 60 days of the study, 3 children consumed mare’s milk prebiotics whereas the other 3 did not. Fecal samples were collected daily during antibiotic therapy and every 5 days after antibiotic therapy. Total DNA was isolated and taxonomic composition of the gut microbiome was analyzed by sequencing of the 16S rRNA gene (V1-V3 region). To evaluate the local immune status the MILLIPLEX MAP platform was used. Counts of 11genera were reduced, which did not recover until the last day of the study. The abundance of Bacteroides were not significantly altered in both groups. Christensenella, Rothia, Abiotrophia, Acinetobacter, Anaerotruncus, Holdemania and Turicibacter numbersare significantly increased at day 5 and remained at the same level during the study period. Cephalosporin administration also reduced pro-inflammatory and anti-inflammatory cyto/ chemokines (MIP1α, TNFα, GMCSF, GCSF, sCD40L, FGF2, TGFα, IL1α, IP10)

Effect of Nitrogen Arc Discharge Plasma Treatment on Physicochemical Properties and Biocompatibility of PLA-Based Scaffolds

The effect of low-temperature arc discharge plasma treatment in a nitrogen atmosphere on the modification of the physicochemical properties of PLA-based scaffolds was studied. In addition, the cellular-mediated immune response when macrophages of three donors interact with the modified surfaces of PLA-based scaffolds was investigated. PLA surface carbonization, accompanied by a carbon atomic concentration increase, was revealed to occur because of plasma treatment. Nitrogen plasma significantly influenced the PLA wettability characteristics, namely, the hydrophilicity and lipophilicity were improved, as well as the surface energy being raised. The viability of cells in the presence of the plasma-modified PLA scaffolds was evaluated to be higher than that of the initial cells

Single Crystal Diamond Needle as Point Electron Source

Diamond has been considered to be one of the most attractive materials for cold-cathode applications during past two decades. However, its real application is hampered by the necessity to provide appropriate amount and transport of electrons to emitter surface which is usually achieved by using nanometer size or highly defective crystallites having much lower physical characteristics than the ideal diamond. Here, for the first time the use of single crystal diamond emitter with high aspect ratio as a point electron source is reported. Single crystal diamond needles were obtained by selective oxidation of polycrystalline diamond films produced by plasma enhanced chemical vapor deposition. Field emission currents and total electron energy distributions were measured for individual diamond needles as functions of extraction voltage and temperature. The needles demonstrate current saturation phenomenon and sensitivity of emission to temperature. The analysis of the voltage drops measured via electron energy analyzer shows that the conduction is provided by the surface of the diamond needles and is governed by Poole-Frenkel transport mechanism with characteristic trap energy of 0.2–0.3 eV. The temperature-sensitive FE characteristics of the diamond needles are of great interest for production of the point electron beam sources and sensors for vacuum electronics