Grains de matière et de lumière. 4, Transmutations provoquées / par Jean Perrin

Collection : Actualités scientifiques et industrielles ; n° 193, VI

Grains de matière et de lumière. 3, Noyaux des atomes / par Jean Perrin

Collection : Actualités scientifiques et industrielles ; n° 192, V

Grains de matière et de lumière. 2, Structure des atomes / par Jean Perrin

Collection : Actualités scientifiques et industrielles ; n° 191, IV

Grains de matière et de lumière. 1, Existence des grains / par Jean Perrin

Collection : Actualités scientifiques et industrielles ; n° 190, III

Electricité / par Jean Perrin,...

Collection : Actualités scientifiques et industrielles ; 8

Lumière / par Jean Perrin,...

Collection : Actualités scientifiques et industrielles ; 876, 2

Evolution / par Jean Perrin,...

Collection : Actualités scientifiques et industrielles ; 7

Espace et temps / par Jean Perrin,...

Collection : Actualités scientifiques et industrielles ; 1

L'énergie / par Jean Perrin,...

Collection : Actualités scientifiques et industrielles ; 6

Masse et gravitation / par Jean Perrin,...

Collection : Actualités scientifiques et industrielles ; 5

Pensamento Lean e cuidado do paciente em morte encefálica no processo de doação de órgãos

A doação de órgãos é um processo complexo que desafia os profissionais e gestores do sistema de saúde. Este estudo objetiva apresentar um modelo teórico de organização do cuidado ao paciente em morte encefálica e o processo de doação de órgãos, balizado pelas principais ideias do pensamento Lean que possibilitam a melhoria da produção a partir de ciclos de planejamentos e criação de um ambiente propício para o sucesso da sua implementação. O pensamento Lean pode tornar mais eficaz e eficiente o processo de doação de órgãos e contribuir com a sua melhoria, a partir da sistematização das informações e capacitação dos profissionais para a excelência do cuidado. O modelo apresentado configura-se como um referencial disponível para validação e aplicação pelos profissionais e gestores de saúde e enfermagem na prática da gestão do cuidado ao paciente potencial doador de órgãos em morte encefálica e respectiva demanda por transplante.

Current multiple myeloma treatment strategies with novel agents: a European perspective.

The treatment of multiple myeloma (MM) has undergone significant developments in recent years. The availability of the novel agents thalidomide, bortezomib, and lenalidomide has expanded treatment options and has improved the outcome of patients with MM. Following the introduction of these agents in the relapsed/refractory setting, they are also undergoing investigation in the initial treatment of MM. A number of phase III trials have demonstrated the efficacy of novel agent combinations in the transplant and nontransplant settings, and based on these results standard induction regimens are being challenged and replaced. In the transplant setting, a number of newer induction regimens are now available that have been shown to be superior to the vincristine, doxorubicin, and dexamethasone regimen. Similarly, in the front-line treatment of patients not eligible for transplantation, regimens incorporating novel agents have been found to be superior to the traditional melphalan plus prednisone regimen. Importantly, some of the novel agents appear to be active in patients with high-risk disease, such as adverse cytogenetic features, and certain comorbidities, such as renal impairment. This review presents an overview of the most recent data with these novel agents and summarizes European treatment practices incorporating the novel agents.

La recherche scientifique / par Jean Perrin

Collection : Actualités scientifiques et industrielles ; n° 58, I

Relativité / par Jean Perrin

Collection : Actualités scientifiques et industrielles ; 3

Developmental stage-specific expression of cyclic adenosine 3',5'-monophosphate response element-binding protein CREB during spermatogenesis involves alternative exon splicing.

Spermatogenesis is a temporally regulated developmental process by which the gonadotropin-responsive somatic Sertoli and Leydig cells act interdependently to direct the maturation of the germinal cells. The metabolism of Sertoli and Leydig cells is regulated by the pituitary gonadotropins FSH and LH, which, in turn, activate adenylate cyclase. Because the cAMP-second messenger pathway is activated by FSH and LH, we postulated that the cAMP-responsive element-binding protein (CREB) plays a physiological role in Sertoli and Leydig cells, respectively. Immunocytochemical analyses of rat testicular sections show a remarkably high expression of CREB in the haploid round spermatids and, to some extent, in pachytene spermatocytes and Sertoli cells. Although most of the CREB antigen is detected in the nuclei, some CREB antigen is also present in the cytoplasm. Remarkably, the cytoplasmic CREB results from the translation of a unique alternatively spliced transcript of the CREB gene that incorporates an exon containing multiple stop codons inserted immediately up-stream of the exons encoding the DNA-binding domain of CREB. Thus, the RNA containing the alternatively spliced exon encodes a truncated transcriptional transactivator protein lacking both the DNA-binding domain and nuclear translocation signal of CREB. Most of the CREB transcripts detected in the germinal cells contain the alternatively spliced exon, suggesting a function of the exon to modulate the synthesis of CREB. In the Sertoli cells we observed a striking cyclical (12-day periodicity) increase in the levels of CREB mRNA that coincides with the splicing out of the restrictive exon containing the stop codons. Because earlier studies established that FSH-stimulated cAMP levels in Sertoli cells are also cyclical, and the CREB gene promoter contains cAMP-responsive enhancers, we suggest that the alternative RNA splicing controls a positive autoregulation of CREB gene expression mediated by cAMP.