A method to estimate weight and dimensions of aircraft gas turbine engines. Volume 1: Method of analysis

Weight and envelope dimensions of aircraft gas turbine engines are estimated within plus or minus 5% to 10% using a computer method based on correlations of component weight and design features of 29 data base engines. Rotating components are estimated by a preliminary design procedure where blade geometry, operating conditions, material properties, shaft speed, hub-tip ratio, etc., are the primary independent variables used. The development and justification of the method selected, the various methods of analysis, the use of the program, and a description of the input/output data are discussed

A method to estimate weight and dimensions of aircraft gas turbine engines. Volume 2: User's manual

For abstract, see N77-25171

Cancer Stem Cells: Notes for Authors.

Stem Cell Reports frequently receives manuscripts dealing with the topic of cancer stem cells. Many of the submissions on this topic have major shortcomings in their content or limits to the conclusions that can be drawn from the results presented. The purpose of this Commentary is to highlight some of the underlying issues so that authors can enhance the strength of their research contributions

A panel of human lung carcinoma lines: establishment, properties and common characteristics.

A panel of human lung carcinoma lines representing the four main histological types (squamous, small-cell, large-cell and adenocarcinoma), and derived from both primary and metastatic sites, has been established in xenograft and in tissue culture. The highest take rates were achieved when biopsy specimens were obtained from large tumour masses and cultured lines were most readily established after preliminary passages as xenografts. The established lines exhibited an overlapping spectrum of biochemical and morphological characteristics, and showed a tendency to change from one cell type to another, in keeping with the concept of a common endodermal cell of origin. Radiation resistance appeared to be related to the large-cell phenotype

A method to estimate weight and dimensions of aircraft gas turbine engines. Volume 3: Programmer's manual

For abstract, see N77-25171

El decaimiento del alcornoque en Cataluña: síntomas y hongos asociados

The cork oak decline in Catalonia is characterised by low vigour of the trees. Most frequent symptoms are trunk cankers caused by fungi, trunk wounds due to bark-stripping, dieback, reduced branch growth, epicormic shooting, defoliation, low leaf surface area, and chlorosis. No significant differences in decline index were detected among trees of different diameter classes, indicating an homogeneous incidence of the disease unrelated to plant age. Moreover, there is not a clear relationship between plot orientation and decline, although the greatest percentage of diseased trees was found in southwest-facing expositions. Fifty-four fungal taxa were recorded after field surveys carried out in several cork oak forests. Several pathogenic fungi were identified: Biscogniauxia mediterranea, Botryosphaeria stevensii, Phomopsis sp., in branch and trunk; Cystodendron dryophilum, Dendrophoma myriadea, Elsinoë quercus-ilicis and Lembosia quercina, in leaves; and Armillaria sp. and Phytophthora cinnamomi, in roots. Some of these fungal species were especially abundant in the aerial parts of declined trees, thus remarking the importance of cork oak pathogens as a contributory factor to the decline of this forest species.El decaimiento que afecta al alcornoque en Cataluña se caracteriza por el aspecto poco vigoroso de los árboles, cuyos síntomas más frecuentes incluyen niveles altos de clorosis, defoliación y muerte de ramillos, un menor crecimiento longitudinal de las ramas, así como la producción de hojas pequeñas. Los síntomas más frecuentes en tronco corresponden a chancros producidos por hongos y heridas debidas al descorche. Esta patología afecta de forma homogénea a individuos de diferentes clases diamétricas, hecho que indica la relativa independencia respecto de la edad de la planta. Tampoco se ha encontrado una relación clara entre el grado de la enfermedad y el descorche, y entre aquél y la exposición de las parcelas estudiadas, aunque la frecuencia más alta de árboles enfermos se observó en vertientes con orientación SO. A partir de las prospecciones de campo realizadas en alcornocales de diversas comarcas de Cataluña, se han identificado 54 táxones fúngicos, entre los que destacan los patógenos siguientes: Biscogniauxia mediterranea, Botryosphaeria stevensii, Phomopsis sp., en tronco y rama; Cystodendron dryophilum, Dendrophoma myriadea, Elsinoë quercus–ilicis y Lembosia quercina, en hoja; y Armillaria sp. y Phytophthora cinnamomi, en raíz. Algunas de estas especies son particularmente abundantes en el tronco y la copa de alcornoques afectados por decaimiento, razón por la que se considera que estos patógenos contribuyen de una forma decisiva, dentro del conjunto de factores bióticos, al decaimiento de esta especie forestal