Lincoln, Abraham, Letter.

Letter to Mrs. Bixby, Boston, Mass. Letter of condolence. The celebrated Bixby Letter . Facsimile of the original manuscript on exhibition at Huber\u27s Museum in New York City.https://dh.howard.edu/og_corres/1065/thumbnail.jp

Education: The Key to Africa’s Future

Africa, a continent full of abundance and potential, is ironically hindered in desolation, deprivation, and chaos. The growth, future, and potential success of Africa is solely dependent on the education of its children. After identifying a number of educational barriers, defining the need for educational improvement, and documenting the efficiency of Western aid, this paper concludes that the West needs to recognize that it is the Africans who must ultimately save their own countries. However, Western programs and aid can help restore Africa when used thoughtfully and effectively. National programs and foreign funding must promote education that places value on the African “way of life,” assists the ‘people’ of Africa, and gives African children a sense of worth, hope, and acceptance in Christ

Epilogue

Factors that may have been decisive in turning Rancho Santa Ana Botanic Garden into a successful establishment of botanical teaching and a garden devoted to the conservation and showcasing of the native California flora are put forward. In addition to the enthusiasm and tenacity of its founder, Susanna Bixby Bryant, inspiration and advice came from several other key figures, notably Carl Brandt Wolf, Ernest Braunton, Willis Linn Jepson, and Theodore Payne

In the Beginning

This article traces the early history of Rancho Santa Ana Botanic Garden, California, starting ca. 1867 with the Portolà Expedition. The expedition was the first to record the site where the botanic garden later came to be located, in Santa Ana Canyon, northeastern Orange County. Successive changes in land ownership eventually led to the Bixby family purchasing the land in 1875. Susanna Bixby Bryant, the founder of Rancho Santa Ana Botanic Garden, acquired the land in 1925

Bixby\u27s Rainforest Rescue

Promotional material and playbill insert for the April 14, 2012 performance of Bixby\u27s Rainforest Rescue.https://opus.govst.edu/cpa_memorabilia/1100/thumbnail.jp

Experimental investigations in combining primal dual interior point method and simplex based LP solvers

The use of a primal dual interior point method (PD) based optimizer as a robust linear programming (LP) solver is now well established. Instead of replacing the sparse simplex algorithm (SSX), the PD is increasingly seen as complementing it. The progress of PD iterations is not hindered by the degeneracy or the stalling problem of the SSX, indeed it reaches the 'near optimum' solution very quickly. The SSX algorithm, in contrast, is not affected by the boundary conditions which slow down the convergence of the PD. If the solution to the LP problem is non unique, the PD algorithm converges to an interior point of the solution set while the SSX algorithm finds an extreme point solution. To take advantage of the attractive properties of both the PD and the SSX, we have designed a hybrid framework whereby cross over from PD to SSX can take place at any stage of the PD optimization run. The cross over to SSX involves the partition of the PD solution set to active and dormant variables. In this paper we examine the practical difficulties in partitioning the solution set, we discuss the reliability of predicting the solution set partition before optimality is reached and report the results of combining exact and inexact prediction with SSX basis recovery

Developments in linear and integer programming

In this review we describe recent developments in linear and integer (linear) programming. For over 50 years Operational Research practitioners have made use of linear optimisation models to aid decision making and over this period the size of problems that can be solved has increased dramatically, the time required to solve problems has decreased substantially and the flexibility of modelling and solving systems has increased steadily. Large models are no longer confined to large computers, and the flexibility of optimisation systems embedded in other decision support tools has made on-line decision making using linear programming a reality (and using integer programming a possibility). The review focuses on recent developments in algorithms, software and applications and investigates some connections between linear optimisation and other technologies

Neural crest stem cells undergo multilineage differentiation in developing peripheral nerves to generate endoneurial fibroblasts in addition to Schwann cells

Neural crest stem cells (NCSCs) persist in peripheral nerves throughout late gestation but their function is unknown. Current models of nerve development only consider the generation of Schwann cells from neural crest, but the presence of NCSCs raises the possibility of multilineage differentiation. We performed Cre-recombinase fate mapping to determine which nerve cells are neural crest derived. Endoneurial fibroblasts, in addition to myelinating and non-myelinating Schwann cells, were neural crest derived, whereas perineurial cells, pericytes and endothelial cells were not. This identified endoneurial fibroblasts as a novel neural crest derivative, and demonstrated that trunk neural crest does give rise to fibroblasts in vivo, consistent with previous studies of trunk NCSCs in culture. The multilineage differentiation of NCSCs into glial and non-glial derivatives in the developing nerve appears to be regulated by neuregulin, notch ligands, and bone morphogenic proteins, as these factors are expressed in the developing nerve, and cause nerve NCSCs to generate Schwann cells and fibroblasts, but not neurons, in culture. Nerve development is thus more complex than was previously thought, involving NCSC self-renewal, lineage commitment and multilineage differentiation

Dr. Paul W. Bixby as Third Lecturer in the Martha Holden Jennings Lecture Series

News release announcing the third lecturer in the Martha Holden Jennings Lecture Series at the University of Dayton will be Dr. Paul W. Bixby with hid lecture, World Citizen Teachers for the 1970\u27s