402 research outputs found
Desarrollo de un proceso de salud eco amigable para el tratamiento de cicatrices patolĂłgicas excesivas
An eco-friendly health process has been designed and implemented for the treatment of excessive pathological scars such as keloids, hypertrophic and inesthetic scars through the use of photons from sunlight as a non-invasive, safe and effective alternative technique in contrast to technical techniques currently used that may be ineffective and risky, that use chemical inputs, energy from non-renewable sources (electrical) and that, often problems of prolonged treatment times. This eco-friendly process oriented to the topic of health is made up of three constitutive units: unit of analysis, treatment and cutaneous rehabilitation, which includes from the identification of the pathology and its own characteristics (thickness, size, pigmentation, etc.); until the prescription of the appropriate treatment and rehabilitation for the affected area. The process uses sunlight for treatment and improvements in the recovery of the affected tissue are expected, thus overcoming the functional limitations caused, it also relieves pain and the disappearance of edemas by 100% and up to 90% improvement in consistency, thickness and appearance of the skin. The process can be applied to patients of any age, sex and in any state of health.Un proceso de salud eco-amigable ha sido diseñado e implementado para el tratamiento de cicatrices patolĂłgicas excesivas como queloides, cicatrices hipertrĂłficas e inestĂ©ticas mediante el uso de fotones provenientes de la luz solar como tĂ©cnica alternativa no invasiva, inocua y efectiva en contraste a las tĂ©cnicas convencionales actualmente empleadas que tienden a ser poco efectivas y riesgosas, que emplean insumos quĂmicos, energĂa de fuentes no renovables (elĂ©ctrica) y que, muchas veces requieren de tiempos prolongados en el tratamiento. Este proceso eco amigable orientado al tema de salud está conformado por tres unidades constitutivas: la unidad de análisis, de tratamiento y de rehabilitaciĂłn cutánea, que abarca desde la identificaciĂłn de la patologĂa y sus caracterĂsticas propias (grosor, tamaño, pigmentaciĂłn, etc.); hasta la prescripciĂłn del tratamiento y rehabilitaciĂłn adecuada para la zona afectada. El proceso utiliza luz solar para el tratamiento y se esperan mejoras en la recuperaciĂłn del tejido afectado, superándose asĂ las limitaciones funcionales causadas, asĂ mismo alivia el dolor y la desapariciĂłn de edemas en un 100% y, hasta un 90% de mejorĂa en consistencia, grosor y aspecto de la piel. El proceso puede ser aplicado a pacientes de cualquier edad, sexo y en cualquier estado de salud
Type IV pili-independent photocurrent production by the cyanobacterium Synechocystis sp. PCC 6803
Biophotovoltaic devices utilize photosynthetic organisms such as the model cyanobacterium Synechocystis sp. PCC 6803 (Synechocystis) to generate current for power or hydrogen production from light. These devices have been improved by both architecture engineering and genetic engineering of the phototrophic organism. However, genetic approaches are limited by lack of understanding of cellular mechanisms of electron transfer from internal metabolism to the cell exterior. Type IV pili have been implicated in extracellular electron transfer (EET) in some species of heterotrophic bacteria. Furthermore, conductive cell surface filaments have been reported for cyanobacteria, including Synechocystis. However, it remains unclear whether these filaments are type IV pili and whether they are involved in EET. Herein, a mediatorless electrochemical setup is used to compare the electrogenic output of wild-type Synechocystis to that of a ΔpilD mutant that cannot produce type IV pili. No differences in photocurrent, i.e., current in response to illumination, are detectable. Furthermore, measurements of individual pili using conductive atomic force microscopy indicate these structures are not conductive. These results suggest that pili are not required for EET by Synechocystis, supporting a role for shuttling of electrons via soluble redox mediators or direct interactions between the cell surface and extracellular substrates
Tracing the evolution of nearby early-type galaxies in low density environments. The Ultraviolet view from GALEX
We detected recent star formation in nearby early-type galaxies located in
low density environments, with GALEX Ultraviolet (UV) imaging. Signatures of
star formation may be present in the nucleus and in outer rings/arm like
structures. Our study suggests that such star formation may be induced by
different triggering mechanisms, such as the inner secular evolution driven by
bars, and minor accretion phenomena. We investigate the nature of the (FUV-NUV)
color vs. Mg2 correlation, and suggest that it relates to "downsizing" in
galaxy formation.Comment: Conference "UV Universe 2010" S. Petersburg 31 May - 3 June, 2010
Accepted for publication in Astrophysics & Space Science . The final
publication is available at http://www.springerlink.co
Non-parametric kernel estimation for symmetric Hawkes processes. Application to high frequency financial data
We define a numerical method that provides a non-parametric estimation of the
kernel shape in symmetric multivariate Hawkes processes. This method relies on
second order statistical properties of Hawkes processes that relate the
covariance matrix of the process to the kernel matrix. The square root of the
correlation function is computed using a minimal phase recovering method. We
illustrate our method on some examples and provide an empirical study of the
estimation errors. Within this framework, we analyze high frequency financial
price data modeled as 1D or 2D Hawkes processes. We find slowly decaying
(power-law) kernel shapes suggesting a long memory nature of self-excitation
phenomena at the microstructure level of price dynamics.Comment: 6 figure
Dynamics of escaping Earth ejecta and their collision probability with different Solar System bodies
It has been suggested that the ejection to interplanetary space of
terrestrial crustal material, accelerated in a large impact, may result in the
interchange of biological material between Earth and other Solar System bodies.
In this paper, we analyze the fate of debris ejected from Earth by means of
numerical simulations of the dynamics of a large collection of test particles.
This allows us to determine the probability and conditions for the collision of
ejecta with other planets of the Solar System. We also estimate the amount of
particles falling-back to Earth as a function of time after being ejected. We
find that, in general, the collision rates of Earth ejecta with Venus and the
Moon, as well as the fall-back rates, are consistent with results reported in
the literature. By considering a larger number of particles than in all
previous calculations we have also determined directly the collision
probability with Mars and, for the first time, computed collision probabilities
with Jupiter. We find that the collision probability with Mars is greater than
values determined from collision cross section estimations previously reported.Comment: 9 pages, 4 figures & 1 table. Submitted to Icaru
Feeding restriction impairs milk yield and physicochemical properties rendering it less suitable for sale
Feed shortages are relatively frequent in subtropical pasture-based dairy production systems. The effect of feed restriction on milk yield and physical-chemical traits was evaluated in this study. The experiment was carried out in Brazil’s south region. Treatments consisted of control and restricted diet. Six multiparous and six primiparous cows, with 499 ± 47.20 kg body weight (BW), at mid-lactation (188 ± 124 days in milk), producing 19.35 ± 4.10 kg of milk were assigned to two groups, balanced for parity, each group receiving a different sequence of the dietary treatments for 56 days, in a crossover design. Diet nominated as control included 8 kg DM 100 kg BW–1 of Bermuda grass var. Tifton pasture (Cynodon dactylon (L.) Pers.), 5.00 kg of concentrate and 2.50 kg of Tifton hay per day. The restriction diet consisted of 50 % of the quantity offered in the control diet. Milk production and physicochemical composition were evaluated. Feed restriction reduced milk production by 40 %, body condition score by 5 %, milk magnesium by 14.3 %, lactose by 1.7 %, titratable acidity by 10 % and stability to the ethanol test by 9 % and it tended to increase (7 %) milk potassium content. No changes were found for the remaining characteristics. Since feed restriction is quite frequent in Brazil’s extensive dairy production systems, our concern is that besides decreased milk production, changes can occur in the physiochemical attributes of the milk, mainly a reduction in the stability to the ethanol test, which may increase the volume of milk rejected by the industry
Conservation and prioritization of indigenous vegetables in the Philippines
Nutrition-related problems are a widespread challenge in the Philippines. Many factors contribute to these problems - the availability and affordability of vegetables, for example, which are jeopardized by challenges such as seasonality and inconsistent yields due to the impacts of climate change. Crop improvement and on-farm diversification, particularly using indigenous vegetables (IVs), can help address these challenges, while also improving rural livelihoods, nutrition, and food security; and even safeguarding local culture and tradition
Centrality Dependence of the High p_T Charged Hadron Suppression in Au+Au collisions at sqrt(s_NN) = 130 GeV
PHENIX has measured the centrality dependence of charged hadron p_T spectra
from central Au+Au collisions at sqrt(s_NN)=130 GeV. The truncated mean p_T
decreases with centrality for p_T > 2 GeV/c, indicating an apparent reduction
of the contribution from hard scattering to high p_T hadron production. For
central collisions the yield at high p_T is shown to be suppressed compared to
binary nucleon-nucleon collision scaling of p+p data. This suppression is
monotonically increasing with centrality, but most of the change occurs below
30% centrality, i.e. for collisions with less than about 140 participating
nucleons. The observed p_T and centrality dependence is consistent with the
particle production predicted by models including hard scattering and
subsequent energy loss of the scattered partons in the dense matter created in
the collisions.Comment: 7 pages text, LaTeX, 6 figures, 2 tables, 307 authors, resubmitted to
Phys. Lett. B. Revised to address referee concerns. Plain text data tables
for the points plotted in figures for this and previous PHENIX publications
are publicly available at
http://www.phenix.bnl.gov/phenix/WWW/run/phenix/papers.htm
The PHENIX Experiment at RHIC
The physics emphases of the PHENIX collaboration and the design and current
status of the PHENIX detector are discussed. The plan of the collaboration for
making the most effective use of the available luminosity in the first years of
RHIC operation is also presented.Comment: 5 pages, 1 figure. Further details of the PHENIX physics program
available at http://www.rhic.bnl.gov/phenix
Conserving and prioritizing indigenous fruits in the Philippines
Nutrition-related problems are a widespread challenge in the Philippines. Many factors contribute to these problems - the availability and affordability of fruits, for example, which are jeopardized by challenges such as seasonality and inconsistent yields due to the impacts of climate change. Crop improvement and on-farm diversification, particularly using indigenous fruits (IFs), can help address these challenges, while also improving rural livelihoods, nutrition, food security; and even safeguarding local culture and tradition
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