RESUMEN
Localized surface plasmon (LSP) modes depend strongly on the morphology of nanoparticle and the surrounding dielectric medium. The hollow nanostructure provides a new way to modulate the surface plasmon modes due to the additional cavity surface. In this work, we study systematically the multipolar surface plasmon modes of hollow silver nanoprism (HSN) by simulation of electron energy loss spectroscopy (EELS) spectra based on the boundary element method (BEM). Herein the effects of the cavity size and position are taken into account. The LSP modes of HSNs are compared with those of perfect silver nanoprism (SN). The red-shift behaviors of multipolar modes can be found as increasing the cavity size. Modes A and C have similar red-shift tendency and obey the plasmon ruler equation, which can be explained by dipole-dipole coupling mode. Meanwhile, the degenerate modes will be split by changing the cavity position, and opposite shift tendencies of split degenerate states are observed. These are caused by different coupling nature of degenerate modes. Moreover, high refractive index sensitivity (RIS) can be obtained for HSN by changing the cavity size and position.
RESUMEN
Two hundred cases of Echinochasmus liliputanus infection were randomly divided into three groups and treated with pyquiton at a single dose of 10.5 and 2.5 mg/kg, respectively. As assessed one month after treatment the egg negativity rates were 100%, 98.7% and 96.5%, respectively. The symptoms such as abdominal pain, distension, diarrhea and anorexia relieved. The results suggest that pyquiton is effective against Echinochasmus liliputanus infection.
Asunto(s)
Praziquantel/administración & dosificación , Infecciones por Trematodos/tratamiento farmacológico , Adolescente , Adulto , Anciano , Niño , Preescolar , Femenino , Humanos , Masculino , Persona de Mediana EdadRESUMEN
Human natural infection with Echinochasmus liliputanus was found for the first time from the inhabitants of Hexian county of Anhui Province in Spring, 1991. Sixty worms collected from 3 infected persons were studied morphologically. The adult worms are leaf-shaped, 1519.4-2056.3 x 466.4-564.0 microns in size. The width of the collar is 235.8-297.3 microns. A row of 24 collar spines with size of 22.5-35.6 x 8.8-10.6 microns is arranged on the collar symmetrically with dorsal and ventral interruption. The oral sucker is terminal, 107.6-148.6 x 102.5-148.6 microns. The length of the prepharynx is 25.6-66.7 microns, the pharynx, 97.3-127.8 microns and the oesophagus 117.9-205.0 microns. The caeca 764.3-1,248.8 x 21.0-39.0 microns extends to the distal end of the body. The acetabulum is anterior to the middle level of the body, 205.0-240.9 x 205.0-235.8 microns in size. Two testes, situated in the posterior one third of the body, is slightly oval, in tandem; the anterior one is 133.3-199.9 x 199.9-256.4 microns in size, and the posterior one, 178.9-251.3 x 164.0-246.0 microns. The Cirrus pouch is kidney-shaped, 211.5-248.5 x 112.8-194.8 microns in size, located between the bifurcation of the intestine and the acetabulum, containing the seminal vesicle and cirrus. The ovary is oval in shape, 71.8-92.3 x 76.8-97.4 microns in size, situated in the middle of the body. The vitellaria are distributed on each side from the acetabulum to subterminal, consisting of many follicles. The uterus is short, convoluted between the anterior testis and the acetabulum, containing 0-6 eggs.(ABSTRACT TRUNCATED AT 250 WORDS)