Thesis (Ph. D.)--University of Chicago, 1941. / Lithoprinted. Includes bibliographical references (p. 6).

This problem has been concerned with, first, the collection of sixteen species of plants belonging to Cactaceae family; second, the drying of these and the extraction of the oleoresins thereof; third, the determination of the extent to which these substances inhibit the growth of ten gram-positive and ten gram-negative bacterial organisms; and fourth, a determination of the possible utilization of these extracts a prophylactic or chemotherapeutic agents.

4 pp.

4 pp. / How to transplant a cactus (az1376) Problems and pests of aloes,agaves,cacti and yuccas (az1399) Cactus, Agave,Yucca,and Ocotillo (az1225) / Propagation of agaves and cacti from seed and cuttings is an easy-to-accomplish process. Cuttings and seed sown during the appropriate time of year using the methods discussed will produce numerous progeny.

Thesis (Ph. D.)--Texas A&M University, 2005. / Includes bibliographical references (p. 150-159). Also available in PDF format via the Internet.

Title from title page of PDF (University of Missouri--St. Louis, viewed March 2, 2010). Includes bibliographical references (p. 56-60).

No description available.

No description available.

Biólogo con mención Medio Ambiente / La pérdida de frugívoros a nivel mundial representa una seria amenaza para la persistencia de las plantas, ya que las interacciones dispersor-planta son fundamentales para la reproducción de estas últimas. Sin embargo, en algunos lugares donde los frugívoros nativos han desaparecido, herbívoros introducidos de gran tamaño pueden actuar como dispersores sustitutos. Una vez que las semillas se han dispersado, pueden germinar inmediatamente o formar banco de semillas. Eulychnia acida es una cactácea columnar endémica que habita la región semiárida de Chile. Estudios previos indican que no hay frugívoros nativos asociados a la dispersión de semillas de este cactus dentro de la Reserva Nacional Las Chinchillas. Sin embargo, existen reportes de animales como la cabra (Capra aegagrus hircus) y el guanaco (Lama guanicoe) consumiendo sus frutos a lo largo del rango de distribución de esta cactácea. En este estudio se evaluó el efecto del paso de semillas de E. acida por el tracto digestivo de C. a. hircus y L. guanicoe, sobre la germinación, sobrevivencia y crecimiento de plántulas. Para ello se, alimentó directamente a C. a. hircus y L. guanicoe con frutos de E. acida para obtener semillas desde sus heces , las que posteriormente fueron usadas en experimentos de germinación y crecimiento. Adicionalmente, se evaluó la capacidad de E. acida de formar banco de semillas y si el paso por el tracto digestivo de las semillas afecta en la viabilidad del banco de semillas de E. acida. Para esto se llevaron a cabo experimentos adicionales un año después de que las semillas hubieran sido recuperadas de las heces de los mamíferos. Los resultados indican que el paso de las semillas por el tracto digestivo de C. a. hircus no tiene efecto sobre la germinación, sobrevivencia o crecimiento de E. acida, mientras que L. guanicoe tiene un efecto negativo sobre la germinación. C. a hircus podría actuar como dispersor al llevar las vii semillas lejos de la planta parental, donde la mortalidad debido a causas denso-dependientes es usualmente mayor. Se detectó un aumento en el porcentaje de germinación en ambos tratamientos para el segundo año del experimento, lo que indica que E. acida podría formar al menos a corto plazo un banco de semillas, lo que se traduciría en efectos positivos para poblaciones de esta especie que habitan en un ambiente altamente variable. Son necesarios estudios adicionales que evalúen la dirección y magnitud de las interacciones entre C. a. hircus y la vegetación nativa para poder generar planes de manejo adecuados para la capricultura en el Norte chico de Chile compatibles con la conservación de especies de plantas endémicas de la zona. / Frugivore loss worldwide represents a serious threat for plant persistence because animal disperser-plant interactions are essential for plant reproduction. However, in some places where native frugivorous have disappeared, introduced large herbivore vertebrates may act as surrogate dispersal agents. Once seeds have been dispersed, they can germinate immediately or form a seed bank. Eulychnia acida is an endemic columnar cactus that inhabits the semiarid region of Chile. Previous studies indicate no native frugivorous associated with the dispersal of E. acida inside Las Chinchillas National Reserve. Notwithstanding, there have been reports of goats (Capra aegagrus hircus) and guanacos (Lama guanicoe) consuming its fruit throughout its distribution. In this study the effect of gut passage on the germination, growth and survival of seeds and seedlings of E. acida ingested by L. guanicoe and C. a. hircus was evaluated. To this end, no-choice feeding experiments were performed to obtain seeds consumed by L. guanicoe and C. a. hircus, which were later used in germination and growth experiments. The ability of E. acida to form a seed bank was also examined, and also if gut passage affects the viability of E. acida’s seed bank. To achieve this, additional germination experiments one year after seeds were retrieved from the tested mammals were carried out. Results indicate that C. a. hircus gut passage has no effect on germination, seedling survival or growth, while L. guanicoe had a negative effect on seed germination. C. a. hircus could be carry seeds away from the parent plant where density-dependent seed mortality is usually higher, thus acting as a seed disperser of E. acida. Germination increased the second year of the experiment for both treatments, which indicates that E. acida could form at least a short-term seed bank translating into a positive effect on populations of this species that inhabits a highly ix variable environment. Studies that evaluate the direction and magnitude of biotic interactions between C. a. hircus and the native vegetation are necessary for the generation of adequate programs for the management of C. a. hircus livestock in the North central region of Chile along with conservation of endemic plant species. / Al FONDECYT 1140521 y 1150112.

From Introduction: In 1934 the Government started an active campaign on the eradiction of Jointed Cactus. This plant was causing considerable damage to the farms and commonages of the Eastern Province, and was spreading at an alarming rate. The Officer in Charge of eradication, Mr E. du Toit, was stationed at Grahamstown which is fairly centrally situated in the infested area. In 1935 Dr A. Leemann of the Division of Plant Industry made his headquarters at Rhodes University College.