Primitive erythropoiesis in early chick embryogenesis. II. Correlation between hemoglobin synthesis and the mitotic history.

Primitive erythroblasts in the circulating blood of the chick embryo continue to divide while synthesizing hemoglobin (Hb). Hb measurements on successive generations of erythroblasts show that there is a progressive increase in the Hb content of both interphase and metaphase cells. Furthermore, for any given embryo the Hb content of metaphase cells is always significantly greater than that of interphase cells. The distribution of Hb values for metaphase cells suggests that there are six Hb classes corresponding to the number of cell cycles in the proliferative phase. The location of erythroblasts in the cell cycle was determined by combining Feulgen cytophotometry with thymidine radioautography on the same cells. Measurements of the Hb content for erythroblasts in different compartments of the cell cycle (G1, S, G2, and M) show a progressive increase through the cycle. Thus, the amount of Hb per cell is a function of the number of cell divisions since the initiation of Hb synthesis and, to a lesser degree, the stage of the cell cycle. Earlier generations of erythroblasts synthesize Hb at a faster rate than the terminal generation. Several models have been proposed to explain these findings

CCL19-sorted mature dendritic cells have enhanced lymph node migratory capacity and function

No abstract available

Development of an avocado rapid library tray system for Hass

The Australian avocado industry currently produces 49,500 tonnes of fruit annually worth AU$180M at farm gate and AU$420M at retail level. The industry is growing by 8% per year. In order to accommodate the escalating fruit production, consumption of avocado in Australia will have to increase and/or alternative markets will have to be sought. Consumer surveys have shown that avocado fruit sales continues to be seriously hindered by variable and poor fruit quality. Consumers have indicated that they would be more inclined to purchase avocados if the quality was guarantied. Library tray systems are used in many fruit industries throughout the world to monitor fruit quality through the cold chain. These systems are most commonly used for export lines and involve long cold storage periods mimicking commercial reality. Since the Australian avocado industry is domestic market based and the cold chain is highly variable, a simple rapid ripening regime was developed which accurately reflects commercial out-turn fruit quality

Control of typhoid fever by vaccination

No Abstract

Nearby CFT's in the operator formalism: The role of a connection

There are two methods to study families of conformal theories in the operator formalism. In the first method we begin with a theory and a family of deformed theories is defined in the state space of the original theory. In the other there is a distinct state space for each theory in the family, with the collection of spaces forming a vector bundle. This paper establishes the equivalence of a deformed theory with that in a nearby state space in the bundle via a connection that defines maps between nearby state spaces. We find that an appropriate connection for establishing equivalence is one that arose in a recent paper by Kugo and Zwiebach. We discuss the affine geometry induced on the space of backgrounds by this connection. This geometry is the same as the one obtained from the Zamolodchikov metric.Comment: 24 pp, CTP#215

Development and commercial application of an avocado fruit robustness test

Fruit quality is one of the major factors limiting growth in avocado retail sales. Avocado growers are often unaware of their end-use fruit quality since quality problems only manifest upon fruit ripening and growers receive limited feedback from the supply chain. If growers were aware of their expected fruit quality they would be equipped to make better marketing decisions and if necessary to take remedial actions to improve their fruit quality. Avotest is being developed as a quick and easy method of determining expected end-use fruit quality before the start of the commercial fruit harvest. The test aims at distinguishing between blocks with robust fruit and those with less robust fruit. The test could also be used to predict the resulting fruit quality after the implementation of new farming practices