289 research outputs found

    Expression of Distal-less, dachshund, and optomotor blind in Neanthes arenaceodentata (Annelida, Nereididae) does not support homology of appendage-forming mechanisms across the Bilateria

    Get PDF
    The similarity in the genetic regulation of arthropod and vertebrate appendage formation has been interpreted as the product of a plesiomorphic gene network that was primitively involved in bilaterian appendage development and co-opted to build appendages (in modern phyla) that are not historically related as structures. Data from lophotrochozoans are needed to clarify the pervasiveness of plesiomorphic appendage forming mechanisms. We assayed the expression of three arthropod and vertebrate limb gene orthologs, Distal-less (Dll), dachshund (dac), and optomotor blind (omb), in direct-developing juveniles of the polychaete Neanthes arenaceodentata. Parapodial Dll expression marks premorphogenetic notopodia and neuropodia, becoming restricted to the bases of notopodial cirri and to ventral portions of neuropodia. In outgrowing cephalic appendages, Dll activity is primarily restricted to proximal domains. Dll expression is also prominent in the brain. dac expression occurs in the brain, nerve cord ganglia, a pair of pharyngeal ganglia, presumed interneurons linking a pair of segmental nerves, and in newly differentiating mesoderm. Domains of omb expression include the brain, nerve cord ganglia, one pair of anterior cirri, presumed precursors of dorsal musculature, and the same pharyngeal ganglia and presumed interneurons that express dac. Contrary to their roles in outgrowing arthropod and vertebrate appendages, Dll, dac, and omb lack comparable expression in Neanthes appendages, implying independent evolution of annelid appendage development. We infer that parapodia and arthropodia are not structurally or mechanistically homologous (but their primordia might be), that Dll’s ancestral bilaterian function was in sensory and central nervous system differentiation, and that locomotory appendages possibly evolved from sensory outgrowths

    The Effects of Integrating E-Media Piano in Teaching Music

    Get PDF
    Historically, schools, universities and adult education providers have used a “lecture-based” teaching model. This approach to learning was developed during the industrial age, some two centuries ago. The concept is for students to sit passively in rows of chairs or tables all facing the presenter, who usually resides at a lectern. A lecture is a “one-to-many” form of communication, involving little or no audience participation. It is authoritarian, by nature. For an information dump a lecture works fine. The development of engaging lecture activities requires a significant amount of instructor preparation and limits the time available to provide traditional lectures. However, the positive results of this study suggest the need for a restructuring of the plain classroom lecture to incorporate more engaging lectures to improve both the qualitative experiences and performance levels of students. Due to the fast changing society and modernization, there is also change in interest of the students learning styles, so the researchers conducted a study about the effect of educational software in teaching music. This research determined the effects of integrating e-media piano in teaching music at Santiago National High School. Specifically, it dealt with the following: the pretest result of the control and experimental group, the post-test of the two groups; and the significant difference between the pretest and posttest results of the two groups. The input of the study was determined by administering the researcher-made test which is the principal tool for gathering the needed data. The gathered data underwent statistical treatments such as mean, standard deviation, t-test for independent means and t-test for dependent means. A pretest was administered from the two study groups before the conduct of the experiment; this is to determine if the groups were equally comparable in terms of intellectual ability. The validated and reliability teacher-made test is composed of twenty-five (25) items. This covered topics about the different elements of music such as melody, tempo, dynamics, rhythm, pitch, harmony, texture, and timbre. Moreover, both groups were given posttest after the experimental period had been conducted. The same 25 multiple choice item tests was given to the experimental and control group to find out if the use of E- Media piano software had an effect to the students’ performance in music. Nevertheless, the latter was superior than the former. Thus, the effectiveness of E-media is notable, enhancing the learners’ capacity for acquisition and retention of information. The integration of e-media piano software to traditional classroom instruction may be encouraged. Educational software specifically designed to fit the learning objectives can be used as motivation, enrichment activity, and as an assessment tool to classroom instruction. The active participation and interest that educational software may provide to the teaching and learning process should be exploited. Educational software made and developed appropriately to the level of the learners may be adopted not only in music but in the other components of M.A.P.E.H as well. Other strategies which may integrate other trends articulated with the interest of today’s learners may also be adapted as exposing students to modernized school can achieve a quality education and can produce lifelong learning

    Family resources study: part 1: family resources, family function and caregiver strain in childhood cancer

    Get PDF
    <p>Abstract</p> <p>Background</p> <p>Severe illness can disrupt family life, cause family dysfunction, strain resources, and cause caregiver burden. The family's ability to cope with crises depends on their resources. This study sought to assess families of children with cancer in terms of family function-dysfunction, family caregiver strain and the adequacy of family resources using a new family resources assessment instrument.</p> <p>Methods</p> <p>This is a cross-sectional study involving 90 Filipino family caregivers of children undergoing cancer treatment. This used a self-administered questionnaire composed of a new 12-item family resources questionnaire (SCREEM-RES) based on the SCREEM method of analysis, Family APGAR to assess family function-dysfunction; and Modified Caregiver Strain Index to assess strain in caring for the patient.</p> <p>Results</p> <p>More than half of families were either moderately or severely dysfunctional. Close to half of caregivers were either predisposed to strain or experienced severe strain, majority disclosed that their families have inadequate economic resources; many also report inaccessibility to medical help in the community and insufficient educational resources to understand and care for their patients. Resources most often reported as adequate were: family's faith and religion; help from within the family and from health providers. SCREEM-RES showed to be reliable with Cronbach's alpha of 0.80. There is good inter-item correlation between items in each domain: 0.24-0.70. Internal consistency reliability for each domain was also good: 0.40-0.92. Using 2-point scoring system, Cronbach's alpha were slightly lower: full scale (0.70) and for each domain 0.26-.82. Results showed evidence of association between family resources and family function based on the family APGAR but none between family resources and caregiver strain and between family function and caregiver strain.</p> <p>Conclusion</p> <p>Many Filipino families of children with cancer have inadequate resources, especially economic; and are moderately or severely dysfunctional. Many caregivers are predisposed to caregiver strain or are already experiencing severe strain. To provide appropriate care for these families, physicians should regularly assess family function, resources and strain experienced by caregivers. The SCREEM-RES questionnaire used in this study is a helpful and reliable instrument to assess adequacy of family resources.</p

    Chatter that Matters: Word-of-Mouth Marketing of Selected Micro Businesses and Small and Medium Enterprises in Malolos City, Bulacan

    Get PDF
    The study quantified the usage of and range of word-of-mouth (WOM) marketing, and analyzed the present state and satisfaction with WOM marketing tactics of selected micro businesses, small and medium enterprises in Malolos City, Bulacan. Purposive and convenience sampling were employed on marketers and owners who were available and who were willing to participate in the study using structured interview questions. 125 companies situated only in Malolos City proper and proximate places were selected

    Sonic hedgehog expression in zebrafish forebrain identifies the teleostean pallidal signaling center and shows preglomerular complex and posterior tubercular dopamine cells to arise from shh cells

    Get PDF
    Ventralization, a major patterning process in the developing vertebrate neural tube (central nervous system, CNS), depends on Sonic hedgehog (SHH) as a main signaling morphogen. We studied the CNS of late larval and young adult zebrafish in a transgenic shh‐GFP line revealing increased neuroanatomical detail due to the progressed differentiation state compared to earlier stages. Some major findings emerge from the present study. (a) shh –GFP is still expressed along the adult zebrafish CNS neuraxis in most locations seen in larvae. (b) We newly identify a ventroposterior shh pallidal domain representing the basal telencephalic signaling center important for basal ganglia development known in other vertebrates (i.e., the anterior entopeduncular area—basal medial ganglionic eminence of mammals). (c) We further show late‐emerging shh‐GFP positive radial glia cells in the medial zone of the dorsal telencephalon (i.e., the teleostan pallial amygdala). (d) Immunostains for tyrosine hydroxylase demonstrate that there is selective colocalization in adult dopamine cells with shh‐GFP in the posterior tuberculum, including in projection cells to striatum, which represents a striking parallel to amniote mesodiencephalic dopamine cell origin from shh expressing floor plate cells. (e) There is no colocalization of shh and islet1 as shown by respective shh‐GFP and islet1‐GFP lines. (f) The only radially far migrated shh‐GFP cells are located in the preglomerular area. (g) There are no adult cerebellar and tectal shh‐GFP cells confirming their exclusive role during early development as previously reported by our laboratory

    Non-Redundant Selector and Growth-Promoting Functions of Two Sister Genes, buttonhead and Sp1, in Drosophila Leg Development

    Get PDF
    The radically distinct morphologies of arthropod and tetrapod legs argue that these appendages do not share a common evolutionary origin. Yet, despite dramatic differences in morphology, it has been known for some time that transcription factors encoded by the Distalless (Dll)/Dlx gene family play a critical role in the development of both structures. Here we show that a second transcription factor family encoded by the Sp8 gene family, previously implicated in vertebrate limb development, also plays an early and fundamental role in arthropod leg development. By simultaneously removing the function of two Sp8 orthologs, buttonhead (btd) and Sp1, during Drosophila embryogenesis, we find that adult leg development is completely abolished. Remarkably, in the absence of these factors, transformations from ventral to dorsal appendage identities are observed, suggesting that adult dorsal fates become derepressed when ventral fates are eliminated. Further, we show that Sp1 plays a much more important role in ventral appendage specification than btd and that Sp1 lies genetically upstream of Dll. In addition to these selector-like gene functions, Sp1 and btd are also required during larval stages for the growth of the leg. Vertebrate Sp8 can rescue many of the functions of the Drosophila genes, arguing that these activities have been conserved, despite more than 500 million years of independent evolution. These observations suggest that an ancient Sp8/Dlx gene cassette was used in an early metazoan for primitive limb-like outgrowths and that this cassette was co-opted multiple times for appendage formation in multiple animal phyla

    Fetal Demise and Failed Antibody Therapy During Zika Virus Infection of Pregnant Macaques

    Get PDF
    Zika virus (ZIKV) infection of pregnant women is associated with pathologic complications of fetal development. Here, we infect pregnant rhesus macaques (Macaca mulatta) with a minimally passaged ZIKV isolate from Rio de Janeiro, where a high rate of fetal development complications was observed. The infection of pregnant macaques with this virus results in maternal viremia, virus crossing into the amniotic fluid (AF), and in utero fetal deaths. We also treated three additional ZIKV-infected pregnant macaques with a cocktail of ZIKV-neutralizing human monoclonal antibodies (nmAbs) at peak viremia. While the nmAbs can be effective in clearing the virus from the maternal sera of treated monkeys, it is not sufficient to clear ZIKV from AF. Our report suggests that ZIKV from Brazil causes fetal demise in non-human primates (NHPs) without additional mutations or confounding co-factors. Treatment with a neutralizing anti-ZIKV nmAb cocktail is insufficient to fully stop vertical transmission
    corecore