Previous calibrations of prokaryotic phylogenetic events were based on the vertebrate fossil record because a detailed microbial fossil record does not exist. Recently, compounds (2-methylhopanoids) that are found in cyanobacterial membranes were identified among compounds extracted from late Archean sedimentary rocks. These lipids establish a minimum time, 2.65 Ga (Billion Years Ago), in the g...

a:4:{s:10:"Background";s:2314:"The research made on stem cells through the last decade and following that the great achievements made applying stem cells in treating vast number of diseases have turned the issue of Cord Blood collecting and saving (cryopreserving) to a critical one. A prompt demand and access to stem cells and applying them in treating a wide range of terminal diseases have led...

background: there has been increasing trend towards surgical treatment of metastases across different cancer types, including breast cancer, in the recent decade. single metastasis of breast cancer to sternum is a rare situation. we present a case of sternectomy for metastasis from breast cancer. case presentation: a 58-year-old woman with a history of modified radical mastectomy for breast can...

Variable (feature) selection has attracted much attention in contemporary statistical learning and recent scientific research. This is mainly due to the rapid advancement in modern technology that allows scientists to collect data of unprecedented size and complexity. One type of statistical problem in such applications is concerned with modeling an output variable as a function of a sma...

Accurate and precise age-at-death estimation methods are critical when studying past lifeways. However, adult is often difficult because of diverse physiologies, preservation, timing biological processes in target reference populations. These challenges can complicate the comparison results between studies, which also be impacted by training method preference each bioarchaeologist. In this pape...