No description available.

No description available.

A taxonomic revision of the Bulimulidae of Sonora, Mexico is undertaken. The existing species are redescribed and their ranges given. Four new species are described and one species synonymized on the basis of anatomical and conchological characteristics. In addition a new genus, Drymaeus Albers, 1850, is recorded for the state and several species are reassigned from Rabdotus Albers, 1850 to Naesiotus Albers, 1850. The zoogeography of the Sonoran species and genera is also presented along with their relationships to congenerics in the rest of North America. It was determined that one of these genera Naesiotus has a North American-South American disjunct distribution and that both it and Rabdotus probably had Southern Hemisphere origins. The mechanisms of isolation and dispersal are discussed and a microplate tectonics model is presented to explain them. The Gondwanaland distribution of the subfamily is also described.

No description available.

No description available.

No description available.

El Alacran, northern Sonora, Mexico, is a high-level, Laramide porphyry copper deposit encompassing an east-west elongated altered and mineralized area of 2.7 by 6 km. A small quartz latite porphyry plug forcefully intrudes comagmatic(?) Late Cretaceous or Early Tertiary andesitic to quartz latite volcaniclastic rocks.Veinlet-controlled and pervasive potassic, Type I phyllic, and transition type alteration with related base-metal mineralization postdates pervasive propylitic alteration and is related in space and time to the intrusive and its associated intrusion-breccia annulus. Potassic alteration is dated by K-Ar at 55.4 +- 1.2 m.y. Later pervasive and veinlet-controlled Type II phyllic and minor advanced argillic alteration is associated with intrusive breccia dikes and pipes which are genetically related to degassing of the system. Minor veinlet-controlled late-stage alteration followed. Hypogene zoning is exhibited by alteration, mineralization, total sulfide volume, mineralized fracture density, and geochemistry with zoning being centered over or to the east of the exposed intrusive. Supergene enrichment processes have modified hypogene sulfides, oxides, and silicates and have formed a copper enriched blanket which underlies a leached cap. The blanket is characterized by a chalcocite zone which grades downward into a bornite-digenite-covellite zone and then into low-grade protore. Although the enriched blanket appears to be subeconomic, this study indicates potential for a deep, high-grade protore zone.

No description available.

No description available.

The purpose of this study was to validate the Adlerian Parenting Educational Model (APEM) as a means of improving parent-child relationships in urban, Mexican families as measured by the movement toward the development of willingness to contribute and cooperate by family members. Research problems and their corresponding hypotheses were formulated to facilitate the validation of the model. The subjects were 42 mothers whose children attended a preschool program in the geographical area of Caborca, Sonora, Mexico. Each subject was actively committed and willing to participate in the APEM. The study utilized a pretest-posttest control group design to obtain an indication of mothers' development of positive changes in their child's behavior and effectiveness in allowing their children to make more positive changes in their behavior as measured by the Social Interest Index, the Adlerian Parental Assessment of Child Behavior Scale, and the Behavior Concepts Inventory: Educational Model. All subjects were administered each instrument prior to the first session to determine their degree of social interest, understanding of Adlerian principles, and potential behavioral areas for mother and children to work with. The two methods of analysis employed, a test of differences between means and a test of homogeneity of variance, revealed that mothers in the treatment group of this program experienced more positive interpersonal relationships among family members, a more positive attitude toward themselves, positive changes in their perceptions of their child's behavior, a more thorough understanding of Adlerian principles, and related more positively to their children than mothers in a control group. The study presented a number of implications for further research and indicate that the APEM may be applied to different groups.