3,774 research outputs found
Use of cytoceratin-20 in revealing of colorectal cancer metastases in liver
The aim of the study is to evaluate the possibilities of immunohistochemical revealing of colorectal cancer micro-metastases in liver and to determine their prognostic significance. Material et metods. The material of the research was fragments of liver tissue with metastases of 36 patients with colorectal cancer who had undergone resection of liver (main group), and randomly chosen fragments of liver tissue without macro metastases of 18 patients with colorectal cancer who had died in early postoperative period. 5-6 fragments of the liver tissue taken from the margins of the largest macro metastasis with the interval 1-2 cm were investigated in each case. The detection of micro-metastases on the paraffin sections with the thickness of 4 microns was carried out with the use of antibodies to cytoceratin-20. The results showed that micro-metastases in liver in the main group had been found in 75,9%, in the comparative group β just in one observation with accidentally revealed macro metastasis. Correlative analysis showed the direct definite link between the appearance of micro-metastases and the presence of macro metastases in liver. The significance of multimicrometastatic spreading for the development of intrahepatic progression and the worsening of the long term prognosis of the patients with colorectal cancer were noted. Conclusion: the possibility of use cytoceratin-20 for revealing micro-metastases in liver
An Investigation of the Mechanism of Water Molecules Interaction with Hydrophilic Disperse Substances by the NMR Method
The paper presents the results of an investigation of the linewidths
and chemical shifts of, the NMR of protons of water molecules
and some magnetic nuclei of counterions (Li+, F-, NH4+, H+)
in aqueous dispersions of a number of ion-exchange resins and
alumosilicates in solutions of high-molecular compounds. The
spectra have been recorded by the high-resolution NMR type
INM-4H-100 spectrometer with a 100 MHz work frequency for
protons and 40 MHz for 7Li in a wide temperature range from
173 K to 373 K.
The phenomenon that the shift of water Β·signal versus tern-
. perature variation is smaller for electrolyte solutions that for
pure water, is proposed to be utilized for the evaluation of the
hydratation numbers of ions in electrolyte solutions. The activation
energy of molecular motion at low temperatures, calculated, from
temperature dependence of the linewidth is 8-16 kcal moi-1 and
it is in good agreement with the results obtained by other techniques.
A model of interaction of water molecules between each other
and with the active centres Β·Of hydrophilic disperse systems has
been proposed. The peculiarities of the interaction of water molecules
with ions of various electron structure have been elucidated.
The hydratation numbers of counterions have been determined and
compared with those for equeous solutions of corresponding salts.
The special features of water molecules on the interface at low
temperatures have been discussed. The role of hydrogen bonds
in the determination of the freezing temperature of water has been
elucidated
Photon emission by an ultra-relativistic particle channeling in a periodically bent crystal
This paper is devoted to a detailed analysis of the new type of the undulator
radiation generated by an ultra-relativistic charged particle channeling along
a crystal plane, which is periodically bent by a transverse acoustic wave, as
well as to the conditions limiting the observation of this phenomenon. This
mechanism makes feasible the generation of electromagnetic radiation, both
spontaneous and stimulated, emitted in a wide range of the photon energies,
from X- up to gamma-rays
ΠΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ Ρ Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΡΠΈΡΡΠΎΠ²ΠΎΠ³ΠΎ ΡΠΎΡΠΎΠΏΠ»Π΅ΡΠΈΠ·ΠΌΠΎΠ³ΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠ΅Π½ΡΠΎΡΠ°
ΠΠΏΠΈΡΠ°Π½ΠΎ Π½ΠΎΠ²ΠΈΠΉ, Π²ΠΈΡΠΎΠΊΠΎΡΡΡΠ»ΠΈΠ²ΠΈΠΉ ΠΎΠΏΡΠΈΡΠ½ΠΈΠΉ ΡΠ΅Π½ΡΠΎΡ, Π½Π° ΠΎΡΠ½ΠΎΠ²Ρ ΡΠ²ΡΡΠ»ΠΎΠ΄ΡΠΎΠ΄ΡΠ², Π· ΡΠΊΠΈΡ
ΠΎΠ΄ΠΈΠ½ Π²ΠΈΠΊΠΎΠ½ΡΡ ΡΡΠ½ΠΊΡΡΡ Π΄ΠΆΠ΅ΡΠ΅Π»Π° ΡΠ²ΡΡΠ»Π°, Π° Π΄ΡΡΠ³ΠΈΠΉ Π·Π²ΠΎΡΠΎΡΠ½ΠΎ-Π·ΠΌΡΡΠ΅Π½ΠΈΠΉ ΡΡΠ½ΠΊΡΡΠΎΠ½ΡΡ ΡΠΊ ΡΠ²ΡΡΠ»ΠΎ- ΠΏΡΠΈΠΉΠΌΠ°Ρ. ΠΠΎΠΊΠ°Π·Π°Π½Π° ΠΌΠΎΠΆΠ»ΠΈΠ²ΡΡΡΡ Π²ΠΈΠΊΠΎΡΠΈΡΡΠ°Π½Π½Ρ Π΄Π°Π½ΠΎΠ³ΠΎ ΠΏΡΠΈΠ½ΡΠΈΠΏΡ Π²ΠΈΠΌΡΡΡΠ²Π°Π½Π½Ρ Π΄Π»Ρ Π·Π°Π΄Π°Ρ ΠΎΡΡΠΈΠΌΠ°Π½Π½Ρ ΠΏΡΠ»ΡΡΠΎΠ²ΠΎΡ Ρ
Π²ΠΈΠ»ΡDesign of. the new, high-sensitivity optica! sensor, on the basis of the light-emitting diodes is presented, one with which carries out function of a light source, and another back displaced functions as the detector. Availability this principle of measuring for problems of recording pulse waves is shownΠΠΏΠΈΡΠ°Π½ Π½ΠΎΠ²ΡΠΉ, Π²ΡΡΠΎΠΊΠΎΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΡΠΉ ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΡΠ΅Π½ΡΠΎΡ, Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠ²Π΅ΡΠΎΠ΄ΠΈΠΎΠ΄ΠΎΠ², ΠΎΠ΄ΠΈΠ½ ΠΈΠ· ΠΊΠΎΡΠΎΡΡΡ
Π²ΡΠΏΠΎΠ»Π½ΡΠ΅Ρ ΡΡΠ½ΠΊΡΠΈΡ ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠ° ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ, Π° Π΄ΡΡΠ³ΠΎΠΉ ΡΡΠ½ΠΊΡΠΈΠΎΠ½ΠΈΡΡΠ΅Ρ ΠΊΠ°ΠΊ Π΄Π΅ΡΠ΅ΠΊΡΠΎΡ. ΠΠΎΠΊΠ°Π·Π°Π½Π° Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π΄Π°Π½Π½ΠΎΠ³ΠΎ ΠΏΡΠΈΠ½ΡΠΈΠΏΠ° ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ Π΄Π»Ρ Π·Π°Π΄Π°Ρ ΡΠ΅Π³ΠΈΡΡΡΠ°ΡΠΈΠΈ ΠΏΡΠ»ΡΡΠΎΠ²ΠΎΠΉ Π²ΠΎΠ»Π½
From the zero-field metal-insulator transition in two dimensions to the quantum Hall transition: a percolation-effective-medium theory
Effective-medium theory is applied to the percolation description of the
metal-insulator transition in two dimensions with emphasis on the continuous
connection between the zero-magnetic-field transition and the quantum Hall
transition. In this model the system consists of puddles connected via saddle
points, and there is loss of quantum coherence inside the puddles. The
effective conductance of the network is calculated using appropriate
integration over the distribution of conductances, leading to a determination
of the magnetic field dependence of the critical density. Excellent
quantitative agreement is obtained with the experimental data, which allows an
estimate of the puddle physical parameters
Pseudo-transient Continuation, Solution Update Methods, and CFL Strategies for DG Discretizations of the RANS-SA Equations
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/106459/1/AIAA2013-2686.pd
Heavy Flavour Physics at HERA - a Survey
At the HERA collider at DESY, high energy electron and positron beams
interact with proton beams. A review is presented of the variety of ways in
which these collisions produce final states containing charm and beauty quarks.Comment: 45 pages including 30 figures. Submitted to International Journal of
Modern Physics
In-Flight Testing of MEMS Pressure Sensors for Flight Loads Determination
The determination and monitoring of structural loads during flight is an important partof every certification program. It must be proved to the certification authorities that the loads occurring during specific flight maneuvers do not exceed the permissible component loads. Usually conventional strain gauges are used to determine structural loads, however an elaborate calibration process is necessary to determine these loads from the measuredstrains. Recent advances in sensor technology allow determining aerodynamic loads directly from pressure distributions measured by MEMS based sensors. When compared to strain gauges this measurement method has several advantages over conventional strain gauges interms of installation and calibration costs. Flight tests were carried out with the DLR researchglider aircraft Discus-2c in order to compare and investigate the loads determined with the two measuring methods. For this purpose a wing glove equipped with 64 MEMS pressure sensors on the airfoil surface was constructed. Different maneuvers with varying loads were performed during the test flights. A first evaluation of steady flight maneuvers shows that theloads determined from the measured pressure distribution are in very good accordance with
the ones determined from the strain gauge measurements. This paper gives an overview of the flight test setup and the data analysis process, results from evaluations of trimmed wings-level flight and steady turn maneuvers are presented and discussed
Effect of Nb doping at Mn site on thermal expansion of Pr 0.7 Sr
a b s t r a c t In this study we present results on effect of Nb doping on thermal expansion of Pr 0.7 Sr 0.3 MnO 3 . Thermal expansion measurements were done using three terminal capacitance method. The pure sample shows a jump at the insulator-metal (I-M) transition temperature, and with Nb doping, a fourfold decrease in the jump is found. Since thermal expansion is a bulk property, this suggests that the dopants are not in the form of local clusters; rather they are distributed uniformly throughout the sample. Temperature variation of Gruniesen ratio Ξ±/C P shows that for temperatures below I-M transition, the ratio is weakly dependent on temperature. Pressure dependence on the transition temperature, dT P /dP and jump in compressibility, ΞΞ², of these samples has been estimated using well-known Ehrenfest equations. The present results are in fairly good agreement with those reported in the literature
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