The money trail: a new historiography for networks, patronage, and scientific careers

Money is everywhere in science. Yet historians have only rarely placed the money trail at the center of their analyses. The essays in this Focus section demonstrate that following the money offers a historiographical path for investigating a number of key issues across disciplinary boundaries in the nineteenth and twentieth centuries. Drawing on cases and materials relating to a number of scientific fields, including electrical engineering, aeronautics, agriculture, and paleontology, the essays examine the continuous role of money in industrial and military patronage, personal connections and networks, and spatial and geographical dimensions of science, as well as in relation to state funding and ownership. Together, the contributions demonstrate how following the money offers a way of overcoming hyperprofessionalism in the history of science.     

Motivation profiles in sport: a self-determination theory perspective

The present study examined the link between motivation profiles among adult sports participants and the consequences of enjoyment, effort, positive and negative affect, attitude toward sport participation, intention to continue sport participation, satisfaction, and frequency of attendance in sport. Two samples of participants (n = 590 and n = 555) completed the Sport Motivation Scale and a range of self-report measures to assess the outcome variables. Exploratory cluster analyses applied to Sample 1 and confirmatory cluster analysis applied to Sample 2 identified two clusters of sport participants. The first comprised participants with high scores on both nonself-determined and self-determined motives. The second comprised participants with high scores on self-determined motives but low scores on nonself-determined motives. Participants in the first cluster scored higher on all outcome variables. The results are discussed with reference to a more in-depth understanding of the motivation dynamics of sport participation based on Self-Determination Theory.     

The virtual desktop: the remote access solution

The increasing expectation for easy, yet full remote access to library materials necessitates innovative thinking on the part of libraries. Other traditional methods of providing access don't always meet the needs of the library or the patrons. This paper describes the project of one library to develop a Virtual Desktop, making access easy to grant or withhold, and also making available a wider array of resources.     

Isolation and manipulation of living adherent cells by micromolded magnetic rafts

A new strategy for magnetically manipulating and isolating adherent cells with extremely high post-collection purity and viability is reported. Micromolded magnetic elements (termed microrafts) were fabricated in an array format and used as culture surfaces and carriers for living, adherent cells. A poly(styrene-co-acrylic acid) polymer containing well dispersed magnetic nanoparticles was developed for creating the microstructures by molding. Nanoparticles of γFe(2)O(3) at concentrations up to 1% wt.∕wt. could be used to fabricate microrafts that were optically transparent, highly magnetic, biocompatible, and minimally fluorescent. To prevent cellular uptake of nanoparticles from the magnetic polymer, a poly(styrene-co-acrylic acid) layer lacking γFe(2)O(3) nanoparticles was placed over the initial magnetic microraft layer to prevent cellular uptake of the γFe(2)O(3) during culture. The microraft surface geometry and physical properties were altered by varying the polymer concentration or layering different polymers during fabrication. Cells plated on the magnetic microrafts were visualized using standard imaging techniques including brightfield, epifluorescence, and confocal microscopy. Magnetic microrafts possessing cells of interest were dislodged from the array and efficiently collected with an external magnet. To demonstrate the feasibility of cell isolation using the magnetic microrafts, a mixed population of wild-type cells and cells stably transfected with a fluorescent protein was plated onto an array. Microrafts possessing single, fluorescent cells were released from the array and magnetically collected. A post-sorting single-cell cloning rate of 92% and a purity of 100% were attained.     

神经科学趋势：思想机器

对猴以及最近对人类大脑的研究正在揭示精神的最关键功能之一的工作记忆的神经基础。     

如何用手机和笔记本上网

一、接入方式 目前,手机上网接入方式主要有四种:红外线接入、传输线接入、PC卡接入及WAP(无线应用协议)手机直接接入。采用前三种方式接入Internet,是利用手机内置的调制解调器,通过数据传输线、红外线等方式将手机同笔记本电脑连接起来,从而实现拨号上网、移动办公。从严格意义上来说,有些人认为前三种不能算是手机上网,只是借用了手机来上网而已。只有像最新推出的支持WAP技术的手机,如诺基亚的7110、摩托     

侵蚀怎样形成山脉

对构造力、侵蚀力和气候的力量如何相互作用形成山脉的认识使人们更加清楚地深入了解地球史。     

Cognitive versus stimulus-response theories of learning

In his 1948 address to the Division of Theoretical-Experimental Psychology of the American Psychological Association, Kenneth W. Spence discussed six distinctions between cognitive and stimulus-response (S-R) theories of learning. In this article, I first review these six distinctions and then focus on two of them in the context of my own research. This research concerns the specification of stimulus-stimulus associations in associative learning and the characterization of the neural systems underlying those associations. In the course of describing Spence's views and my research, I hope to communicate some of the richness of Spence's S-R psychology and its currency within modern scientific analyses of behavior.