Environmental microbial colistin resistance in an elderly south Brazilian long-term care facility.

Colistin resistance is a global health concern, with antibiotics being the last treatment for Gram-negative bacteria infections. We aimed to identify colistin-resistant enterobacteria on environmental surfaces of a long-term care facility (LTCF) for the elderly in southern Brazil. Samples were collected and screened on MacConkey agar plus colistin, followed by API20E identification and PCR.

Short- and Long-Term Social Recognition Memory Are Differentially Modulated by Neuronal Histamine.

The ability of recognizing familiar conspecifics is essential for many forms of social interaction including reproduction, establishment of dominance hierarchies, and pair bond formation in monogamous species. Many hormones and neurotransmitters have been suggested to play key roles in social discrimination. Here we demonstrate that disruption or potentiation of histaminergic neurotransmission differentially affects short (STM) and long-term (LTM) social recognition memory.

4-(3-Aminoazetidin-1-yl)pyrimidin-2-amines as High-Affinity Non-imidazole Histamine H Receptor Agonists with in Vivo Central Nervous System Activity.

Despite the high diversity of histamine H receptor (HR) antagonist/inverse agonist structures, partial or full HR agonists have typically been imidazole derivatives. An in-house screening campaign intriguingly afforded the non-imidazole 4-(3-azetidin-1-yl)pyrimidin-2-amine as a partial HR agonist. Here, the design, synthesis, and structure-activity relationships of analogues are described.

Intracerebellar microinjection of histaminergic compounds on locomotor and exploratory behaviors in mice.

The neural histaminergic system innervates the cerebellum, with a high density of fibers in the vermis and flocculus. The cerebellum participates in motor functions, but the role of the histaminergic system in this function is unclear. In the present study, we investigated the effects of intracerebellar histamine injections and H1, H2 and H3 receptor antagonist injections (chlorpheniramine, ranitidine, and thioperamide, respectively) and H4 receptor agonist (VUF-8430) on locomotor and exploratory behaviors in mice.

Removal of Procion Red dye from colored effluents using HSO-/HNO-treated avocado shells (Persea americana) as adsorbent.

The treatment of colored effluents containing Procion Red dye (PR) was investigated using HSO and HNO modified avocado shells (Persea americana) as adsorbents. The adsorbent materials (AS-HSO and AS-HNO) were properly characterized. The adsorption study was carried out considering the effects of adsorbent dosage and pH.

Intracerebellar vermis histamine facilitates memory consolidation in the elevated T maze model.

Experimental evidence suggests that the cerebellum plays a more complex role in learning than simply regulating the motor response. Rather, it is thought to play a significant role in the consolidation of emotional memory in mice. Due to the difficulty of interpreting fear and anxiety behaviors-the standard methodology for the study of the histaminergic system and emotional memory-in mice, we propose a behavioral assessment of mice subjected to the Elevated T-maze after histamine microinjection of the cerebellar vermis.

Cerebellar vermis H₂ receptors mediate fear memory consolidation in mice.

Histaminergic fibers are present in the molecular and granular layers of the cerebellum and have a high density in the vermis and flocullus. Evidence supports that the cerebellar histaminergic system is involved in memory consolidation. Our recent study showed that histamine injections facilitate the retention of an inhibitory avoidance task, which was abolished by pretreatment with an H2 receptor antagonist.