87 research outputs found
The anatomy of the fundic branches of the stomach: preliminary results
The fundic branches of the stomach can be defined as a group of vessels that
can arise either directly or indirectly from the following source arteries: the left
inferior phrenic artery, the accessory left hepatic artery, the left gastric artery,
the left middle suprarenal artery, the main trunk of the splenic artery, the posterior
gastric artery, the superior polar artery, the gastrosplenic artery, the left
gastroepiploic artery and the splenic artery with its inferior and superior terminal
branches. It is worth mentioning that the fundic branches of the left gastroepiploic
artery and the superior and inferior terminal branches of the splenic
artery, like other vessels arising from these three source arteries and supplying
the stomach, are defined as short gastric arteries.
The anatomy of these fundic branches, particularly relevant to some surgical
procedures, is not sufficiently described, and the current literature suffers from
lack of publications on this particular topic. We therefore decided to explore in
detail the arterial vascularisation of the gastric fundus.
The research was carried out on material consisting of 15 human stomach
specimens. The anatomical analysis comprised the following: the number of
occurrences of fundic branches in each of the source arteries defined above,
the distance between the origins of the source artery and its arising fundic
branch, the way in which the fundic branches arose, the length, diameter at
point of origin and morphology of the fundic braches, as well as the exact
point of perforation of each fundic branch on the fundus.
The highest incidence of the direct-branching pattern of fundic branches was
in the left middle suprarenal artery, the gastrosplenic artery and the left gastrosplenic
artery. The accessory left hepatic artery, the left gastric artery and the
main trunk of the splenic artery were the most frequent site of the indirectly
arising pattern of fundic branch. The highest median value of fundic branch
length was 63.05 mm, found in the accessory left hepatic artery group. The
largest median diameter value of the vessel was encountered among those
originating in the left middle suprarenal artery and reached 2.17 mm. The
posterolateral quadrant of the fundus received the largest number of fundic
branches, amounting to 46.5% of all the fundic branches studied. (Folia Morphol
2008; 67: 120–125
The effects of pesticide mixtures on degradation of pendimethalin in soils
Most agronomic situations involve a sequence of herbicide, fungicide, and insecticide application. On the other hand, use of pesticidal combinations has become a standard practice in the production of many agricultural crops. One of the most important processes influencing the behavior of a pesticide in the environment is its degradation in soil. It is known that due to several pesticide applications in one vegetation season, the pesticide may be present in mixtures with other pesticides or xenobiotics in soil. This study examines the role which a mixture of chemicals plays in pesticide degradation. The influence of other pesticides on the rate of pendimethalin (PDM) degradation in soil was measured in controlled conditions. Mixtures of PDM with mancozeb or mancozeb and thiamethoxam significantly influenced the degradation of pendimethalin under controlled conditions. The second type of mixtures, with metribuzin or thiamethoxam, did not affect the behavior of pendimethalin in soil. Also, we determined the influence of water content on the rate of pendimethalin degradation alone in two soils and compared it to the rate in three pesticide mixtures. We compared two equations to evaluate the predictors of the rate of herbicide dissipation in soil: the first-order kinetic and the non-linear empirical models. We used the non-linear empirical model assuming that the degradation rate of a herbicide in soil is proportional to the difference of the observed concentration of herbicide in soil at time and concentration of herbicide in the last day of measurement
Assessing fitness-to-practice of overseas-trained health practitioners by Australian registration & accreditation bodies
Assessment of fitness-to-practice of health professionals trained overseas and who wish to practice in
Australia is undertaken by a range of organisations. These organisations conduct assessments using a range of
methods. However there is very little published about how these organisations conduct their assessments. The
purpose of the current paper is to investigate the methods of assessment used by these organisations and the
issues associated with conducting these assessments
Comparison of select kinetic models of herbicides degradation in soil
The aim of the paper was to used of three types of
mathematical function: the single
first-order degradation kinetics (SFO), Gustafson and Holden model (FOMC) and the simple
linear bi-phase model, for quantification of the fate of pesticides in soil. For instance data from
laboratory study of dissipation of atrazine in soil
was used. Numerical methods using for
estimate of structural coefficients of degradation
models of this herbicide. For every models
assessed the values of 50, 90 and 100% dissipation
time of substance active. Mathematical
equations and figures of first derivative of functions were presented as the analysis of atrazine
degradation process. Accomplishment of estimate ade
quately of using models. To the last
degree of the kinetics criterions of degradation of substance active and the statistics criterions
make good the Gustafson
and Holden
model. In this work find that analysis of degradation rate
is valuable of study integration of kinetics degradation herbicides in soil
Growth kinetics of three clones of basket willow (Salix viminalis L.) depending on soil salinity
Przeprowadzono wstępne badania, dotyczące wpływu różnych dawek NaCl
(poziomów zasolenia), dodawanych do podłoża glebowego na kinetykę wzrostu trzech
klonów Salix viminalis L. W czasie wegetacji rośliny dwukrotnie podlewano roztworami
chlorku sodu o stężeniach: 0 (kontrola); 1; 1,5; 2%. Miarą wzrostu były przyrosty długości
i grubości pędów; oznaczono też suchą masę roślin. Do opisu procesów wzrostu najbardziej
właściwa okazała się funkcja kwadratowa. Największą dynamiką wzrostu elongacyjnego
charakteryzował się klon Bjor przy poziomie zasolenia 1%. Przy tym samym
zasoleniu największe przyrosty grubości pędu miały klony Jorr i Tora. Ogólnie pod
względem plonu suchej masy najbardziej tolerancyjnym na stres solny okazał się klon
Jorr, a najmniej – klon Tora.Preliminary studies were conducted on the effects of various doses of NaCl (salinity
levels) added to soil on the growth kinetics of three clones of Salix viminalis L. During
vegetation the plants were treated twice with the solution of sodium chloride at the
following concentrations: 0 (control); 1; 1.5; 2%. Growth was measured with increases in
shoot length and thickness; dry matter was also determined. The growth process was best
described with quadratic function. The highest elongation growth dynamics was noted for
Bjor clone at 1% salinity level. At the same salinity the greatest stem thickness increase
was observed in Jorr and Tora. As far as the dry matter yield was concerned, Jorr was
found to be most tolerant to saline stress, while Tora – least tolerant
Ocena wybranych technik TCT w odwzorowywaniu rzeczywistych obiektów
Techniki przyspieszające procesy prototypowania oraz wytwarzania we współczesnym przemyśle oraz nauce są obiektem dużego zainteresowania. Zwiększająca się dostępność nowoczesnych technik skracania czasu sprawia, iż coraz częściej prowadzi się szereg badań mających na celu analizę efektywności zastosowania technologii TCT (Time-Compressing Technologies) w różnorodnych procesach. Celem niniejszej pracy jest przedstawienie oraz ocena wybranych technik przyspieszających wytwarzanie. Zakres pracy obejmuje przedstawienie ogólnego podziału technik TCT oraz ich krótką charakterystykę, omówienie technik Rapid Prototyping oraz Rapid Manufacturing, a także ocenę wykorzystania skanera 3D oraz druku 3D w procesie odwzorowywania rzeczywistych elementów. W pracy przedstawiono rezultaty badań mające na celu porównanie parametrów elementu wytworzonego za pomocą technik TCT z parametrami obiektu rzeczywistego.Rapid Prototyping and Rapid Manufacturing techniques are the subject of great interest in current industry and science. Increasing amount of modern TimeCompressing Technologies causes needs of conduct a lot of research in TCT efficiency analysis area in various processes. The article presents discussing and evaluation of selected Time-Compressing Technologies. First of all, the TCT – Rapid Prototyping and Rapid Manufacturing was outlined. Moreover, the evaluation of using 3D scanner and 3D printer in real objects modelling are presented. In the final part of the paper the authors presented and discussed parameters comparison of real object and model prepared by means of TCT
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