David Emmanuel M. General
Museum of Natural History
UP Los Baños
First Global Molecular Phylogeny and Biogeographical Analysis of Two Arachnid Orders (Schizomida and Uropygi) Supports a Tropical Pangean Origin and Mid-Cretaceous Diversification. Journal of Biogeography, 44 (11): 2660–2672, November 2017.
Mount Hamiguitan, in Davao Oriental, is famous for a large (~225 has.) pygmy forest and is a UNESCO World Heritage Site. We sampled ants in four zones (elevations in brackets): 1) near the Research Center [400 meters above sea level (masl)]; 2) established trail to Camp 4 [no fixed elevation]; 3) Camp 4 [940 masl], a semi-permanent campsite for researchers and forest guards; and 4) Camp 3 [1150 masl], another semi-permanent campsite for researchers and forest guards. Except for Zone 2, we used a suite of techniques to sample the ants, namely: pitfall trapping; Winkler extraction of leaf litter ants; breaking of rotten twigs and logs; and opportunistic collecting. In Zone 2, we only collected opportunistically. A total of 1,677 ant specimens were collected. Using current taxonomic references to many ant genera, we identified 122 species of ants, belonging to 51 genera and 8 subfamilies in the Family Formicidae. At least two ant species are new to science. We present a table of ant species and in which zone and how they were collected. This is the first ever transect study of the ants of Mt. Hamiguitan.
Link to the article: http://onlinelibrary.wiley.com/doi/10.1111/jbi.13076/abstract
Impact Factor: (2016/2017) 4.248
Rosario R. Rubite
Department of Biology
College of Arts and Sciences
Three New Species of Begonia sect. Baryandra from Panay Island, Philippines. Botanical Studies, 58: 28, 13 pages, December 2017.
Three new species of Panay assignable to Begonia sect. Baryandra endemic to the Philippines is here described and illustrated. Studies of literature, herbarium specimens, and living plants support the recognition of the three new species: Begonia culasiensis, B. merrilliana, and B. sykakiengii. Somatic chromosomes at metaphase were determined to be 2n = 30 for B. culasiensis and 2n = 28 for both B. merrilliana and B. sykakiengii, congruent with those of most species in sect. Baryandra.
Link to the article: https://link.springer.com/article/10.1186/s40529-017-0182-x
Impact Factor: (2016/2017) 1.452
Clarissa L. Velayo
Department of Physiology
College of Medicine
Ultrasound Imaging of Mouse Fetal Intracranial Hemorrhage Due to Ischemia/Reperfusion. Frontiers in Physiology, 8: 340, 9 pages, May 2017.
Despite vast improvements in perinatal care during the last 30 years, the incidence rate of brain damage in babies detected after delivery remains unchanged. Brain injury while in the womb, including fetal intracranial hemorrhage or bleeding within the brain, caused by a sudden loss then return of blood flow (ischemia/reperfusion) is known as one of the primary triggers of neonatal injury. However, the mechanisms of brain injury prior to birth are poorly understood. Here we show a live mouse model for fetal intracranial hemorrhage developed to investigate the actual timing of hypoxia-ischemic events and their related mechanisms of injury. Brain injury in a baby mouse was stimulated without directly touching the fetal body but by using repeated occlusion and opening of the uterine and ovarian arteries in the mother. The fetal brains were monitored in real time by ultrasound imaging. The disappearance of blood flow in certain parts of the brain signified abnormal vascular maintenance (autoregulation) which triggered brain injury. Brain samples were then studied using microscopic techniques which confirmed earlier ultrasound findings. This study revealed “where” and “when” the intracranial hemorrhage occurs. However, “why” it occurs is subject to further investigation.
Link to the article:
Impact Factor: (2016/2017) 4.134