Antigen-specific killing ability of effector CD8+ T cells is critical for protective immunity against infection. Here, we describe in vivo cytotoxic T cell assay to examine effector function of antigen-specific CD8+ T cells. Mice infected with Listeria monocytogenes (L. monocytogenes) expressing chicken ovalbumin as a model antigen mount ovalbumin-specific CD8+ T cell responses. Effector CD8+ T...

Tumor cell killing utilizing hematoporphyrin derivative (HPD) phototherapy was studied in a murine tumor model to assess the relative importance of intratumor temperature in causing the tumoricidal effect. Temperature measurements and tumor killing without HPD strongly suggest that HPD phototherapy as reported previously by other workers has at least partially a hyperthermic effect. Also, it is...

We have constructed a synthetic ecosystem consisting of two Escherichia coli populations, which communicate bi-directionally through quorum sensing and regulate each other's gene expression and survival via engineered gene circuits. Our synthetic ecosystem resembles canonical predator-prey systems in terms of logic and dynamics. The predator cells kill the prey by inducing expression of a kille...

Thymidine incorporation by HEp-2 cells was reduced 10-fold by 2.5 mM hydroxyurea (HU). The DNA in lysates from untreated cells sedimented through alkaline sucrose gradients as an aggregate plus a smaller component which could be chased into the aggregate. Only small DNA (ca. 47 S) was synthesized in nuclei when cells were incubated with HU. HU inhibition was reversible up-to 24 hr. Removal of i...

A terbium complex has been designed that may be used to sensitise formation of singlet oxygen (phi(em) 12%), allowing the creation of a ratiometric sensory system for pO(2) (versus the insensitive Eu analogue) and the definition of a reactive probe that can be used to cause local damage to cells loaded with the complex and exposed to laser excitation.

George Floyd’s killing brought us together for this special issue.A year later, we wrapped up the manuscripts issue and witnessed trial conviction of Derek Chauvin. killing...

background: in recent years, immunocompromised patients are at high risk for the development of invasive aspergillosis. due to the increase of antimicrobial resistance, natural agents with medicinal and immunomodulatory effects has gained more attention. honey is a natural substance with documented antimicrobial, anti-inflamatory and wound healing effects. objectives: the purpose of this study ...

We investigate higher rank Killing-Yano tensors showing that third rank Killing-Yano tensors are not always trivial objects being possible to construct irreducible Killing tensors from them. We give as an example the Kimura IIC metric were from two rank Killing-Yano tensors we obtain a reducible Killing tensor and from third rank Killing-Yano tensors we obtain three Killing tensors, one reducib...