Migrants inside and outside Africa. Motivations, Paths and Routes

The phenomenon of migration has always existed during the history of man since the beginning of time, just think of the history of the diaspora of the Jewish people until the great migrations of the nineteenth century which involved several European peoples, including Italians, Germans, Poles, and non-Europeans, such as the Japanese, heading to North or South America. This article, using official sources provided by IOM, UNHCR and other accredited international statistical sources, aims to offer a critical reflection about the motivations, routes and paths of migrants outside and inside Africa, showing that only a small part of them reach Europe. In fact, the first attractive centre for internal migration is C\uf4te d'Ivoire, one of the countries, together with Nigeria, which is the driving force behind the sparsely populated economy of West Africa, rich in agricultural raw materials (starting with cocoa and coffee). Finally, particular attention is given to the Italian case because is the geographical area most affected by the landings of migrants. In fact, hostility towards migrants in Italy at the end of last year was on the increase: one Italian in two said he considered immigrants a danger and was afraid of it

The nightlife spaces: the case of bush bars in Abuja

Night time has been constantly neglected in the field of urban studies. Most of the literature in the fields of Urban Geography and Sociology has examined the daytime temporal space, neglecting the nocturnal dynamics. In fact, for only about a decade, geographical works in the sphere of night studies have taken place. This contribution, starting from the reflections of Lefebvre (1991) who claimed that specific activities took place and still take place only at night, examines particular meeting places such as bush bars, which are typical nightclubs developed in Nigeria in recent times. Present in the capital Abuja and not only, closed during the day, they come to life at dusk and are placed in the green areas of urban and peri-urban spaces; finally they enliven the African night and, under the glow of the moon and the stars, they are also the meeting place where meetings take place and important decisions are taken, they are not only a place for fun and entertainment. The aim of the qualitative research, targeted at a sample of convenience, is to inform, to make known how in an urban space referred to a capital of an African country such as Nigeria there can be particular places of aggregation not present in the western cities that they try to imitate, both from design and skyline and in the construction of relational and social dynamics, related to night entertainment

Arachidonic Acid Metabolism In Murine Fibrosarcoma Cells With Differing In Vivo And In Vitro Characteristics

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/144314/1/ijc1985363383.pd

Evaluating the Impedance Field through several transport models: a comparison

J. APPL. PHYS

12/13/1993 - Initiated Into Phi Alpha Eta Jurges Studzinski.pdf

International audienc

Vascular tube formation on matrix metalloproteinase-1-damaged collagen

Connective tissue damage and angiogenesis are both important features of tumour growth and invasion. Here, we show that endothelial cells maintained on a three-dimensional lattice of intact polymerised collagen formed a monolayer of cells with a cobblestone morphology. When the collagen was exposed to organ culture fluid from human basal cell tumours of the skin (containing a high level of active matrix metalloproteinase-1 (MMP-1)), degradation of the collagen matrix occurred. The major degradation products were the $3over 4$- and $1over 4$-sized fragments known to result from the action of MMP-1 on type I collagen. When endothelial cells were maintained on the partially degraded collagen, the cells organised into a network of vascular tubes. Pretreatment of the organ culture fluid with either tissue inhibitor of metalloproteinase-1 (TIMP-1) or neutralising antibody to MMP-1 prevented degradation of the collagen lattice and concomitantly inhibited endothelial cell organisation into the vascular network. Purified (activated) MMP-1 duplicated the effects of skin organ culture fluid, but other enzymes including MMP-9 (gelatinase B), elastase or trypsin failed to produce measurable fragments from intact collagen and also failed to promote vascular tube formation. Together, these studies suggest that damage to the collagenous matrix is itself an important inducer of new vessel formation

Does human education integrate full-time education? What pedagogical practices tell us?

O artigo aborda como a formação humana pode integrar a educação integral nos contextos de resistência à estrutura escolar, em que tempos e espaços cindidos promovem reprodução de relações desumanizantes. Com uma abordagem qualitativa da pesquisa, contextualizou-se política e conceitualmente o tema. Em seguida, foi feito o registro narrativo da experiência com alfabetização de uma professora de escola pública para refletir sobre como as dimensões ética e estética podem se materializar na educação integral. Essa materialização indica a potência de recriação do trabalho pedagógico como ato responsável para o reconhecimento das crianças como autoras de seu processo de aprendizagem.39108177192The article discusses how human education can integrate full-time education in contexts of resistance to school structure in which split time and spaces promote the reproduction of dehumanizing relationships. Using a qualitative approach, the topic is contextualized politically and conceptually. Furthermore, there is a narrative record of literacy experience in a public school in order to reflect on how ethical and aesthetic dimensions can be materialized in fulltime education. This materialization indicates the power of re-creation of pedagogical practice as a responsible act for the recognition of children as authors in their own learning process

Voltage controlled terahertz transmission through GaN quantum wells

We report measurements of radiation transmission in the 0.220--0.325 THz frequency domain through GaN quantum wells grown on sapphire substrates at room and low temperatures. A significant enhancement of the transmitted beam intensity with the applied voltage on the devices under test is found. For a deeper understanding of the physical phenomena involved, these results are compared with a phenomenological theory of light transmission under electric bias relating the transmission enhancement to changes in the differential mobility of the two-dimensional electron gas