Gastric adenocarcinoma in a patient re-infected with H. pylori after regression of MALT lymphoma with successful anti-H. pylori therapy and gastric resection: a case report

BACKGROUND: Helicobacter pylori (H. pylori) has been etiologically linked with primary gastric lymphoma (PGL) and gastric carcinoma (GC). There are a few reports of occurrence of both diseases in the same patient with H. pylori infection. CASE PRESENTATION: We report a patient with PGL in whom the tumor regressed after surgical resection combined with eradication of H. pylori infection. However, he developed GC on follow up; this was temporally associated with recrudescence / re-infection of H. pylori. This is perhaps first report of such occurrence. CONCLUSIONS: Possible cause and effect relationship between H. pylori infection and both PGL and GC is discussed. This case also documents a unique problem in management of PGL in tropical countries where re-infection with H. pylori is supposed to be high

Dynamics of a Liquid Droplet on a Granular Bed of Microstructured Particles: From Lens Formation to Marble Effect

We explore the dynamics and morphologies of a droplet permeation on a loosely bound granular bed composed of microporous or micropatterned particles. Naturally abundant particles such as Cycas revoluta (sago), Papaver somniferum (poppy), and Sinapis alba (mustard) have been employed to prepare homogeneous and heterogeneous porous-granular beds. The experiments uncovered that a highly porous bed of mustard particles could stabilize a static water lens by pinning the three-phase contact line of the droplet on the micropatterned particle surface. Interestingly, a water-lens could transform into a “liquid marble” when the bed was composed of smaller poppy particles with a micropatterned surface. Simulations uncovered that an upward convective current due to the deformation and recoil of the droplet together with the vertical component of the capillary force near the pinned contact line helped the poppy particles to climb on the water-lens to form the liquid marbles. A bed of microporous sago particles were also found to show a phenomenon similar to the marble effect in which the particles remained partially or fully embedded inside the drop-surface. Simulations uncovered that an air current issuing out of the porous bed due to droplet permeation enforced microporous particles dislodging from the bed. Heterogeneous porous-granular beds composed of poppy-crushed sago particles showed the two different types of marble effects occurring simultaneously from different sides of the same droplet. The study on the kinetics of the drop permeation showed that the rate of permeation was much slower when the drop passed through the bed–air interface than when the droplet was already inside the bed. Addition of surfactant to the water droplet resulted in a faster permeation rate, which also ensured a smaller lifetime for the lens and marble formation. In comparison, an increase in viscosity could kinetically stabilize the lens and delay the formation of the marble. Concisely, the study uncovered a multitude of interesting dynamics of droplets over granular beds composed of particles with microporous and micropatterned surfaces

Dynamics of a Liquid Droplet on a Granular Bed of Microstructured Particles: From Lens Formation to Marble Effect

We explore the dynamics and morphologies of a droplet permeation on a loosely bound granular bed composed of microporous or micropatterned particles. Naturally abundant particles such as Cycas revoluta (sago), Papaver somniferum (poppy), and Sinapis alba (mustard) have been employed to prepare homogeneous and heterogeneous porous-granular beds. The experiments uncovered that a highly porous bed of mustard particles could stabilize a static water lens by pinning the three-phase contact line of the droplet on the micropatterned particle surface. Interestingly, a water-lens could transform into a “liquid marble” when the bed was composed of smaller poppy particles with a micropatterned surface. Simulations uncovered that an upward convective current due to the deformation and recoil of the droplet together with the vertical component of the capillary force near the pinned contact line helped the poppy particles to climb on the water-lens to form the liquid marbles. A bed of microporous sago particles were also found to show a phenomenon similar to the marble effect in which the particles remained partially or fully embedded inside the drop-surface. Simulations uncovered that an air current issuing out of the porous bed due to droplet permeation enforced microporous particles dislodging from the bed. Heterogeneous porous-granular beds composed of poppy-crushed sago particles showed the two different types of marble effects occurring simultaneously from different sides of the same droplet. The study on the kinetics of the drop permeation showed that the rate of permeation was much slower when the drop passed through the bed–air interface than when the droplet was already inside the bed. Addition of surfactant to the water droplet resulted in a faster permeation rate, which also ensured a smaller lifetime for the lens and marble formation. In comparison, an increase in viscosity could kinetically stabilize the lens and delay the formation of the marble. Concisely, the study uncovered a multitude of interesting dynamics of droplets over granular beds composed of particles with microporous and micropatterned surfaces

Bulk Rashba Spin Splitting and Dirac Surface State in p ‐Type (Bi0.9Sb0.1)2Se3(Bi_{0.9}Sb_{0.1})_2Se_3 Single Crystal

Herein, bulk Rashba spin splitting (RSS) and associated Dirac surface state in (Bi0.9Sb0.1)2Se3, exhibiting dominant p-type conductivity is reported. It is argued that the synchrotron diffraction studies that origin of the bulk RSS is due to a structural transition to a non-centrosymmetric 3 phase below ≈30 K. The Shubnikov–de Haas–Van oscillations are observed in the magnetoresistance curves at low temperature. The extrapolation of the linear plots for both the || and ⊥ component in the Landau level fan diagram meet at n = 0.40(6) for 1/H = 0, which is close to n = 0.5 is recommended for the Dirac particles. The magnetization results at low temperature exhibit substantial orbital magnetization consistent with the bulk RSS. The bulk RSS and Dirac surface states are confirmed by the first-principles density functional theory calculations. The coexistence of orbital magnetism, bulk RSS, and Dirac surface state is unique for p-type (Bi0.9Sb0.1)2Se3, making it an ideal candidate for spintronic applications