Receptive Stage Research Articles

Impulse response and spatio-temporal wave-packets: The common feature of rogue waves, tsunami, and transition to turbulence

Here, we present the impulse response of the canonical zero pressure gradient boundary layer from the dynamical system approach. The fundamental physical mechanism of the impulse response is in creation of a spatio-temporal wave-front (STWF) by a localized, time-impulsive wall excitation of the boundary layer. The present research is undertaken to explain the unit process of diverse phenomena in geophysical fluid flows and basic hydrodynamics. Creation of a tsunami has been attributed to localized events in the ocean-bed caused by earthquakes, landslides, or volcanic eruptions, whose manifestation is in the run up to the coast by surface waves of massive amplitude but of very finite fetch. Similarly rogue waves have often been noted; a coherent account of the same is yet to appear, although some explanations have been proposed. Our studies in both two- and three-dimensional frameworks in Sengupta and Bhaumik [“Onset of turbulence from the receptivity stage of fluid flows,” Phys. Rev. Lett. 107(15), 154501 (2011)] and Bhaumik and Sengupta [“Precursor of transition to turbulence: Spatiotemporal wave front,” Phys. Rev. E 89(4), 043018 (2014)] have shown that the STWF provides the central role for causing transition to turbulence by reproducing carefully conducted transition experiments. Here, we furthermore relax the condition of time behavior and use a Dirac-delta wall excitation for the impulse response. The present approach is not based on any simplification of the governing Navier-Stokes equation (NSE), which is unlike solving a nonlinear shallow water equation and/or nonlinear Schrödinger equation. The full nonlinear Navier-Stokes equation (NSE) is solved here using high accuracy dispersion relation preserving numerical schemes and using appropriate formulation of the NSE which minimizes error. The adopted numerical methods and formulation have been extensively validated with respect to various external and internal 2D and 3D flow problems. We also present results from the Orr-Sommerfeld equation to show that the origin of the STWF is via a linear mechanism. Nonlinearity and nonparallelism play the central role in causing these phenomena of geophysics and transition to turbulence.

Análise microbiológica e avaliação das Boas Práticas de Fabricação durante o fluxograma de processamento do repolho branco (Brassica oleracea var. capitata f. alba) cru servido em um restaurante self-service

Introduction: The consumption of meals outside the home has become an increasingly common practice in the life of the Brazilian population and of everyone. Objective: The aim of this work was to evaluate the microbiological quality of raw white cabbage (Brassica oleracea var. capitata f. alba), served in an institutional self-service restaurant, in the different stages of processing (reception, sanitation, slicing, cooling and distribution). In addition, Good Manufacturing Practices (GMP) were evaluated through a checklist. Method: Total coliform, Escherichia coli and total aerobic bacteria were counted and Salmonella spp. was searched. Results: A sample collected at the reception stage showed Salmonella spp. Sanitization eliminated Salmonella spp. and reduced total coliforms and E. coli to undetectable numbers. The environment, the equipment and the manipulation strongly influenced the microbiological quality of food. Samples collected on day 4, after slicing, showed 3.2 log CFU of E. coli per g and at distribution 4.1 log CFU/g, which indicates unsatisfactory hygienic conditions. The restaurant had 55.75% compliance with GMP items, being classified as regular (Group 2), in accordance with RDC n° 275/2002. Conclusions: The non-conformities (37.00%) observed in the exposure to prepared food consumption may be influencing the microbiological quality of raw white cabbage salad served. In this way we highlight the importance of the application of GMP in the production process to obtain a safe food and the compliance with the four POP required by RDC n° 216/2004.

IEEE 802.11n Communications in the Presence of Frequency-Sweeping Interference Signals

This paper presents an analysis of the impact of intentional electromagnetic (EM) interferences on the performance of Wi-Fi communications. The goal is to analyze the susceptibility of orthogonal frequency-division multiplexing (OFDM) signals and to understand how certain parameters of the interference signal act on the degradation of the communication, taking into account the signal processing performed at the reception stage of the communication system. We analyze the relationship between the parameters of the interference and the signal processing at the reception. This study is a contribution for agile communication solutions that would have the ability to reconfigure the signal processing in order to reduce the impact of interference signals. The scenario corresponds to an IEEE 802.11n wireless network affected by a frequency-sweeping interference signal. The interference signal sweeps over a given frequency band, and different sweep periods and interference to signal power ratios are applied. A set of measurements was performed to evaluate the performance of the communication network in the presence of different EM interferences. Bit rate measurements are presented and the impact of the interference characteristics on communication quality is analyzed, by highlighting the effect of the signal processing performed by the OFDM receiver.

Identification and Functional Annotation of Genes Differentially Expressed in the Reproductive Tissues of the Olive Tree (Olea europaea L.) through the Generation of Subtractive Libraries.

The olive tree is a crop of high socio-economical importance in the Mediterranean area. Sexual reproduction in this plant is an essential process, which determines the yield. Successful fertilization is mainly favored and sometimes needed of the presence of pollen grains from a different cultivar as the olive seizes a self-incompatibility system allegedly determined of the sporophytic type. The purpose of the present study was to identify key gene products involved in the function of olive pollen and pistil, in order to help elucidate the events and signaling processes, which happen during the courtship, pollen grain germination, and fertilization in olive. The use of subtractive SSH libraries constructed using, on the one hand one specific stage of the pistil development with germinating pollen grains, and on the other hand mature pollen grains may help to reveal the specific transcripts involved in the cited events. Such libraries have also been created by subtracting vegetative mRNAs (from leaves), in order to identify reproductive sequences only. A variety of transcripts have been identified in the mature pollen grains and in the pistil at the receptive stage. Among them, those related to defense, transport and oxidative metabolism are highlighted mainly in the pistil libraries where transcripts related to stress, and response to biotic and abiotic stimulus have a prominent position. Extensive lists containing information as regard to the specific transcripts determined for each stage and tissue are provided, as well as functional classifications of these gene products. Such lists were faced up to two recent datasets obtained in olive after transcriptomic and genomic approaches. The sequences and the differential expression level of the SSH-transcripts identified here, highly matched the transcriptomic information. Moreover, the unique presence of a representative number of these transcripts has been validated by means of qPCR approaches. The construction of SSH libraries using pistil and pollen, considering the high interaction between male-female counterparts, allowed the identification of transcripts with important roles in stigma physiology. The functions of many of the transcripts obtained are intimately related, and most of them are of pivotal importance in defense, pollen-stigma interaction and signaling.

Komunitas serangga yang berasosiasi dengan buah Ficus racemosa L.

Pollination within syconium (figs) of the fig trees (Ficus spp.) depends on female fig wasps that belong to Family Agaonidae (Order Hymenoptera); on the other hand, the female wasps can only lay eggs inside the fig flowers in which the offspring later develop. Several species of non-pollinating wasps are also known to develop within the figs. A research to investigate the fig wasps community (pollinator and non-pollinator) and their impact on the figs has been conducted on fig tree species of Ficus racemosa L. in Aceh Province. Fig fruits of F. racemosa were sampled when they were on receptive stage (B-phase) and when the figs were almost mature (D-phase) on the same trees. The young figs were dissected to observe the pollinating wasps (foundresses), while the mature figs were incubated until the new generation of fig wasps emerged from the figs. The wasps then were identified and counted. Observations on B-phase figs showed that the pollinating wasps of F. racemosa was Ceratosolen fuscicep (Mayr) (Hymenoptera: Agaonidae) which entered the fig through ostiole. The fig wasps community that emerged from D-phase figs consisted of pollinating and non-pollinating fig wasps, Platyneura fusca dan P. agraensis (Hymenoptera: Agaonidaed) were the competitors of pollinating wasps in taking the ovules for their development, while Apocrypta sp. (Hymenoptera: Pteromalidae) was a parasitoid of the pollinator. However, in this research there was no evident that the presence of these non-pollinating wasps significantlyt affect the number of pollinating wasps and seeds of F. racemosa.

Integrin beta8 (ITGB8) activates VAV-RAC1 signaling via FAK in the acquisition of endometrial epithelial cell receptivity for blastocyst implantation

Integrin beta8 (ITGB8) is involved in the endometrial receptivity. The blastocyst first interacts with the luminal endometrial epithelial cells during its implantation; therefore, we have investigated the signaling of ITGB8 via FAK and VAV-RAC1 in the endometrial epithelial cells. Integrin beta8 was found elevated in epithelial cells at late-pre-receptive (day4, 1600 h) and receptive (day5, 0500 h) stages of endometrial receptivity period in the mouse. Integrins downstream molecule FAK has demonstrated an increased expression and phosphorylation (Y397) in the endometrium as well as in the isolated endometrial epithelial cells during receptive and post-receptive stages. Integrin beta8 can functionally interact with FAK, VAV and RAC1 as the levels of phosphorylated-FAK, and VAV along with the RAC-GTP form was reduced after ITGB8 knockdown in the endometrial epithelial cells and uterus. Further, VAV and RAC1 were seen poorly active in the absence of FAK activity, suggesting a crosstalk of ITGB8 and FAK for VAV and RAC1 activation in the endometrial epithelial cells. Silencing of ITGB8 expression and inhibition of FAK activity in the Ishikawa cells rendered poor attachment of JAr spheroids. In conclusion, ITGB8 activates VAV-RAC1 signaling axis via FAK to facilitate the endometrial epithelial cell receptivity for the attachment of blastocyst.

Geographic variation in floral traits is associated with environmental and genetic differences among populations of the mixed mating species Collinsia heterophylla (Plantaginaceae)

Relatively few studies have investigated how geography, environmental factors, and genetics affect floral trait variation. We used mixed-mating Collinsia heterophylla Buist to explore variation in a suite of floral traits related to mating system in populations representing four geographic regions of California, USA, and relate this variation to geography, climatic factors, and local site characteristics. We evaluated the environmental vs. genetic trait variability in the greenhouse. Stage of anther–stigma contact correlated positively with temperature, stage of stigma receptivity was negatively associated with vegetation cover, and flower size differed among populations without any clear relation to environmental factors. Greenhouse data indicated heritability for stage of anther–stigma contact, flower size, and time to flowering, and positive correlations between field and greenhouse for stage of stigma receptivity and flower size; however, stage of anther–stigma contact showed a high degree of environmental influence. Stage of anther–stigma contact covaried positively with stage of stigma receptivity and flower size across maternal families, indicating genetic correlations between traits. In conclusion, phenotypic floral variation within mixed-mating C. heterophylla is mostly determined by a genetic component. Geography, environment, and genetics affect traits differently, suggesting that ecological and evolutionary processes contribute to shaping variability in mating system-related traits.

Kaizen Application at The Reception Stage in a Sugarcane Plant

The main reasons for the decline of the sugar and alcohol sector in the last decade are the increased cost of production, delayed investment in the recovery of sugarcane plantations aiming higher production volumes, lack of competitiveness of ethanol and sugar and lack of investment in new technologies. This situation faced by the sugarcane industry in Piracicaba/ SP leads the sugarcane companies to seek increasingly competitiveness. This condition leads to continuous improvements, like the development of production systems. In this sense, a new operational and strategic orientation is needed to achieve the objective of profit maximization, and to excel in the current situation through an increase in productivity. In this paper, we intend to achieve the application of kaizen in the production process of a sugar and alcohol plant, specifically, at the reception of sugarcane. Therefore, this paper aims to apply the concept of lean manufacturing to maximize the yield of sugarcane reception process. The research method used was obtained in an exploratory literature review of the main concepts of lean production in order to provide the necessary basis for application of kaizen. A case study was carried out for the implementation of the concept. The contribution of this work is at pointing out improvements in the sugarcane reception process through a lean tool, the Current and Future Value Stream Mapping.

Endoglin (CD105) coordinates the process of endometrial receptivity for embryo implantation

Endoglin is a TGF-β receptor that is expressed in uterine endothelial and stromal cells in addition to trophoblast expression. However, the functional importance of endoglin in the embryo implantation process is not clear. We observed endoglin expression in the endometrium throughout the stages of its receptivity; however, its expression was enhanced during the receptive stage. Endoglin expression was predominant in epithelial cells of the lumen and glands, but showed a milder expression in stromal cells. Endoglin expression was initially observed in the primary decidual zone and later extended to the secondary decidua zone. Knockdown of endoglin via siRNA reduced the implantation sites along with the blastocyst numbers. Mouse blastocyst with endoglin-silenced endometrial epithelial cells (human and mouse origin) showed poor trophoblast outgrowth, which suggests an essential role for endoglin during endometrial receptivity. In conclusion, our findings reveal the association of endoglin with endometrial receptivity, which is important for embryo attachment.

Uterine inactivation of muscle segment homeobox (Msx) genes alters epithelial cell junction proteins during embryo implantation.

Embryo implantation requires that the uterus differentiate into the receptive state. Failure to attain uterine receptivity will impede blastocyst attachment and result in a compromised pregnancy. The molecular mechanism by which the uterus transitions from the prereceptive to the receptive stage is complex, involving an intricate interplay of various molecules. We recently found that mice with uterine deletion ofMsxgenes (Msx1(d/d)/Msx2(d/d)) are infertile because of implantation failure associated with heightened apicobasal polarity of luminal epithelial cells during the receptive period. However, information on Msx's roles in regulating epithelial polarity remains limited. To gain further insight, we analyzed cell-type-specific gene expression by RNA sequencing of separated luminal epithelial and stromal cells by laser capture microdissection fromMsx1(d/d)/Msx2(d/d)and floxed mouse uteri on d 4 of pseudopregnancy. We found that claudin-1, a tight junction protein, and small proline-rich (Sprr2) protein, a major component of cornified envelopes in keratinized epidermis, were substantially up-regulated inMsx1(d/d)/Msx2(d/d)uterine epithelia. These factors also exhibited unique epithelial expression patterns at the implantation chamber (crypt) inMsx1(f/f)/Msx2(f/f)females; the patterns were lost inMsx1(d/d)/Msx2(d/d)epithelia on d 5, suggesting important roles during implantation. The results suggest thatMsxgenes play important roles during uterine receptivity including modulation of epithelial junctional activity.-Sun, X., Park, C. B., Deng, W., Potter, S. S., Dey, S. K. Uterine inactivation of muscle segment homeobox (Msx) genes alters epithelial cell junction proteins during embryo implantation.

Update of Wnt signaling in implantation and decidualization

Embryonic development into an implantation-competent blastocyst, synchronized uterine transformation into a receptive stage, and an intimate cross-talk between the activated blastocyst and the receptive uterus are essential for successful implantation, and therefore for subsequent pregnancy outcome. Evidence accumulating during recent years has underlined the importance of the Wnt signaling pathway in mammalian implantation and decidualization. Herein, this review focuses on the current state of knowledge regarding Wnt signaling in multiple implantation and decidualization events: pre-implantation embryo development, blastocyst activation for implantation, uterine development, and decidualization.

Face-induced expectancies influence neural mechanisms of performance monitoring

In many daily situations, the consequences of our actions are predicted by cues that are often social in nature. For instance, seeing the face of an evaluator (e.g., a supervisor at work) may activate certain evaluative expectancies, depending on the history of prior encounters with that particular person. We investigated how such face-induced expectancies influence neurocognitive functions of performance monitoring. We recorded an electroencephalogram while participants completed a time-estimation task, during which they received performance feedback from a strict and a lenient evaluator. During each trial, participants first saw the evaluator's face before performing the task and, finally, receiving feedback. Therefore, faces could be used as predictive cues for the upcoming evaluation. We analyzed electrocortical signatures of performance monitoring at the stages of cue processing, task performance, and feedback reception. Our results indicate that, at the cue stage, seeing the strict evaluator's face results in an anticipatory preparation of fronto-medial monitoring mechanisms, as reflected by a sustained negative-going amplitude shift (i.e., the contingent negative variation). At the performance stage, face-induced expectancies of a strict evaluation rule led to increases of early performance monitoring signals (i.e., frontal-midline theta power). At the final stage of feedback reception, violations of outcome expectancies differentially affected the feedback-related negativity and frontal-midline theta power, pointing to a functional dissociation between these signatures. Altogether, our results indicate that evaluative expectancies induced by face-cues lead to adjustments of internal performance monitoring mechanisms at various stages of task processing.

Eklesiologická iniciace pastoračního poslání církve. Příspěvek k diskuzi o recepci Druhého vatikánského koncilu

Is the pontificate of Pope Francis the next stage of the Second Vatican Council reception or is the beginning of a new post-conciliar Church situation? Is the way we perceive and understand the Church changing fundamentally now 50 years after the Council? Does the Church's discourse contain things the Council could not even have imagined? These questions lead us to formulating two basic hypotheses which will be developed in detail. First, each phase of the reception and subsequent reflection on the reception of the Council ties together the pluriformity of ecclesiological models and pastoral propedeutics manifested in basic pastoral decisions as responses by faith to the changing world around us. Secondly, finding a new unity in the situation of pluriformity of ecclesiological models, as brought by the phases of reflection on the reception of the Council, will be possible provided that the basic pastoral propedeutics described in the text will be transformed by pastorality as the basic driving force of the initiation by the Council. Pastorality is the interpretative key of the Council brought to the Church by Francis's pontificate.

Understanding and improving endometrial receptivity.

For a successful pregnancy, the synchronic coordination between the embryonic development and the endometrial status is crucial. The endometrium is a hormonally regulated organ that is nonadhesive to embryos throughout most of the menstrual cycle in humans. Endometrial receptivity refers to a hormone-limited period in which the endometrial tissue acquires a functional and transient ovarian steroid-dependent status allowing blastocyst implantation and therefore pregnancy initiation. Our group has developed the endometrial receptivity array (ERA), a customized array based on the expression of 238 genes coupled to a computational predictor capable of diagnosing a functionally receptive endometrium regardless of its histological appearance. Clinical results obtained in our laboratory demonstrate the diagnostic and therapeutic efficiency of the ERA test in patients with implantation failure, allowing the personalization of the optimal day for embryo transfer. To keep improving the global knowledge of endometrial receptivity stage, new high-throughput techniques like RNA-seq or genome-wide association studies will be crucial in the near future. Also the identification of new biomarkers of endometrial receptivity that could be assessed by noninvasive methods has become a challenging goal to help diagnose the endometrial status to increase implantation rates and pregnancy outcomes in patients undergoing assisted reproductive treatments.

Abstract P2-10-06: Group visits to provide gynecologic care for women affected by breast cancer

Abstract Background Advancements in treatment have resulted in a growing number of women now living with or affected by breast cancer. This patient population has complex and unique gynecologic needs. Two thirds of breast cancers are hormone positive and these patients will often be given Tamoxifen or aromatase inhibitors which have specific gynecologic effects. Additionally, oophorectomy may be done as part of breast cancer treatment. Chemotherapy may induce menopause with the need for safe and effective treatments for menopausal symptoms. Gynecologists have a very important role in providing care to women affected by breast cancer. Group visits are increasingly used to provide education and care in the setting of chronic disease, including breast cancer. There is limited data regarding the use of this type of healthcare delivery in providing gynecologic focused care to this complex and growing patient population. Methods This is a cross-sectional study measuring patient expectations and satisfaction with the practice of group visits as a model for providing gynecological health information to women affected by breast cancer. From July 2010 through February 2014 we surveyed women who participated in a two hour new patient visit that involved a one hour information session followed by an approximately 30 minute individual exam with a gynecologist. The goals were to measure the role of a small group format and an individual’s sense of satisfaction with their gynecology clinic experience. Demographic data was collected to determine if there were any correlations with satisfaction and women’s age, stage of disease, hormone receptor and menopausal status. Results A total of 104 women participated during the study period. Over 80% of participants in group visits felt that their expectations were met during the visit. Eight five percent felt they had a better knowledge of treatments for gynecologic side effects from cancer treatments. When assessing disease and demographic factors that might be associated with satisfaction, we found that women with hormone receptor positive breast cancer and those with treatment induced menopause were more likely to prefer group visits than women with hormone receptor negative breast cancer or natural menopause. Women with stage 3-4 disease preferred the group education visit experience more than women with stage 1-2 disease. Conclusion There is a need to provide comprehensive gynecologic care and education to the expanding population of women impacted by breast cancer. Our data suggests that group visits are an effective and well-received strategy for providing gynecologic care to this niche patient practice. Incorporating a group visit model into a practice is a cost-effective educational modality to providing sources of information and support. Based on our observed differences in satisfaction and preference for group visits by stage of disease, menopause status and hormone receptivity, we recommend investigations grouping similar patients to further improve unique patient education and satisfaction. Citation Format: Sally R Greenwald, Sarah Watson, Tami S Rowen, Mindy Goldman. Group visits to provide gynecologic care for women affected by breast cancer [abstract]. In: Proceedings of the Thirty-Seventh Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2014 Dec 9-13; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2015;75(9 Suppl):Abstract nr P2-10-06.

Real Police and Fictional Police: A Study of Public Perceptions Through Online Commentaries

Contemporary police scholars have argued that it is important to study “how representations of the police and policing are produced and received” (Loader, 1997: 5) and what social meanings are created by them. Police scholars have claimed that police television series produce media images which frame social relations, and social relations, in turn, frame media images (Clarke, 1983, 1992; Lassiter, 1996; Leishman and Mason, 2003: 126, 134-138; Reiner, 2008: 315, 317, 2010: 178). Given that there is no common name for these theoretical assumptions, this paper proposes to use ‘feedback loop theory’ to unite these assumptions into a common framework. In addition to analysing the content of police shows, scholars have recently begun to focus on the stage of production (Colbran, 2014; Lam, 2013) and the stage of reception (Cummins et al., 2014; De Bruin, 2011; Dowler et al., 2006; McClean, 2011). The purpose of this study is to add empirically to reception studies and to test the feedback loop theory by analysing how people discussing fictional police dramas refer to the actual police and police-related issues. I answer these questions by carrying out a content analysis of popular Russian-language internet discussion forums where internet users review Russia’s most famous police show Glukhar’ (2008-2011). The paper shows that this police procedural frames what ordinary citizens and the police chiefs expect from the police, and thus the results of the study illustrate the feedback loop theory.

Agency as capabilities: Ukrainian women's narratives of social change and mobility

Synopsis The article argues for the usefulness of the capability approach in understanding agency in situations of social change. It develops the notion of agency as a continuum of capabilities. Agency defined in this way comprises of various stages of resistance, action, reception and adaptation and involves different capabilities intrinsic to individual well-being, including mobility. Agency as a continuum of capabilities accounts for the element of chance inherent in situations where habits and routines cannot guide action in meaningful ways. It also grasps the new forms of action needed in situations of social change better than definitions of agency that emphasise deliberation and reflexivity. The article illustrates this re-conceptualisation of agency through a close-reading and follow-up of the lives of three Ukrainian women who recall post-Soviet ‘transition’, migration to Italy and their trajectories into, and out of, domestic work.

Analysis and Design of a New Dispersion Relation Preserving Alternate Direction Bidiagonal Compact Scheme

In the present work bidiagonal schemes have been analyzed first by using global spectral analysis for wave propagation problem. The properties given by the numerical amplification factor, dispersion and phase error are presented for these schemes to study effects on error propagation for 1D convection equation. Analysis of bidiagonal schemes helps in designing a new alternate direction bidiagonal (ADB) spatial scheme with improved numerical dispersion and dissipation properties. Design of the ADB scheme is facilitated by the prefactorization technique given in Hixon and Turkel (J Comput Phys 158:51---70, 2000) and is obtained here by minimizing the error in computing 1D convection equation using the correct stability and error analysis given in Sengupta et al. (J Comput Phys 226:1211---1218, 2007). The ADB scheme for spatial discretization is coupled with four-stage, fourth order accurate Runge---Kutta time marching scheme and optimized for multiple objective functions by classical tools to obtain a new space-time discretization scheme with desired numerical amplification and dispersion properties up to moderate wavenumbers, preserving physical dispersion relation almost exactly. The resultant optimal DRP scheme is fourth order accurate, both in space and time. We have compared this scheme with an accurate compact scheme in reproducing exact solution of 1D convection equation. Two benchmark problems from computational acoustics are shown for further verification of the accuracy of solution obtained by the present method. To demonstrate the practical utility of the method, we have presented the solution of zero pressure gradient flow past semi-infinite flat plate from the receptivity stage to fully developed inhomogeneous turbulent state without any model and compared with published results in Sengupta et al. (Phys Rev E 85:026308, 2012).

What we can learn from…: It's good to be me

This month, our focus is on a topic very close to a child's heart – It's good to be me – which makes for a excellent topic to start the new school year, whether it be in reception or key stage 1.

Brazil’s Cooperation with Sub-Saharan Africa in the Rural Sector

South-South cooperation is grounded in the idea that partners from the developing world are well placed to propose solutions inspired by their own experiences. A study of the dynamics of the circulation of instruments of public policy framed in the agricultural sector between Brazil and Sub-Saharan Africa under the Lula administration (2003–2010) reveals that political entrepreneurs play a key role in the early transfer stages of this process and that a technical logic of policy transfer through South-South cooperation may pose important challenges to the later stages of reception and adaptation. A notion of complementarity between agribusiness and family farming that reflects recent governmental discourse has been influential in the formulation of initiatives. A cooperação sul-com-sul se baseia na ideia de que os parceiros do mesmo mundo se situam bem para propor soluções inspiradas pela sua própria experiência. Um estudo da dinâmica de como se difundam os instrumentos das políticas públicas adotadas no setor agrícola entre o Brasil e os paises da África sub-saariana dos tempos da administraçõ do Presidente Lula (2003–2010) revela que os empresários públicas tiveram um papel chave nas etapas iniciais deste processo e que uma lógica técnica da transferència das políticas para tal cooperação sul-com-sul pode apresentar desafios importantes às etapas subsequentes da recepção e adaptação. Uma noção de que pode existir uma complementaridade entre os agronegócios e a agricultura familial—algo que se nota atualmente no discurso governamental—estaba influencial em formular os iniciativos.