OALib Journal期刊

ISSN: 2333-9721




2019 ( 17 )

2018 ( 92 )

2017 ( 110 )

2016 ( 153 )


匹配条件: “David Kays” ,找到相关结果约52933条。
Diamondback terrapin (Malaclemys terrapin terrapin) research and conservation project on the Atlantic coast of Southern New Jersey, USA
Roger Wood,Daniel McLaughlin,David Kays
Asian Journal of Conservation Biology , 2012,
Neonatal diabetes mellitus and congenital diaphragmatic hernia: coincidence or concurrent etiology?
Emmanuelle S Topiol, Laurie A Minarich, Charles A Williams, Roberto T Zori, David W Kays, Michael J Haller
International Journal of Pediatric Endocrinology , 2012, DOI: 10.1186/1687-9856-2012-21
Editorial - Special Issue: Emergent Learning, Connections, Design for Learning
Rod Sims,Elena Kays
International Review of Research in Open and Distance Learning , 2011,
Large-Range Movements of Neotropical Orchid Bees Observed via Radio Telemetry
Martin Wikelski,Jerry Moxley,Alexander Eaton-Mordas,Margarita M. López-Uribe,Richard Holland,David Moskowitz,David W. Roubik,Roland Kays
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0010738
Abstract: Neotropical orchid bees (Euglossini) are often cited as classic examples of trapline-foragers with potentially extensive foraging ranges. If long-distance movements are habitual, rare plants in widely scattered locations may benefit from euglossine pollination services. Here we report the first successful use of micro radio telemetry to track the movement of an insect pollinator in a complex and forested environment. Our results indicate that individual male orchid bees (Exaerete frontalis) habitually use large rainforest areas (at least 42–115 ha) on a daily basis. Aerial telemetry located individuals up to 5 km away from their core areas, and bees were often stationary, for variable periods, between flights to successive localities. These data suggest a higher degree of site fidelity than what may be expected in a free living male bee, and has implications for our understanding of biological activity patterns and the evolution of forest pollinators.
Evaluation of a social marketing intervention promoting oral rehydration salts in Burundi
Sethson Kassegne, Megan B Kays, Jerome Nzohabonayo
BMC Public Health , 2011, DOI: 10.1186/1471-2458-11-155
Abstract: In 2006 and 2007, PSI conducted household surveys among Burundian females of reproductive age (15-49). Both surveys used a two-stage sampling process to select 30 households in each of 115 rural and urban collines throughout the nation. Survey respondents were asked about diarrhea treatment-related behavior; key behavioral determinants; and exposure to the ORASEL intervention. Data were analyzed to identify trends over time, characteristics of ORASEL users, and associations between exposure to the intervention and changes in ORASEL use and related behavioral determinants.ORASEL use among caregivers at their children's last diarrheal episode increased significantly from 20% in 2006 to 30% in 2007, and there were also desirable changes in several behavioral determinants associated with ORASEL use. Evaluation analysis showed that a higher level of exposure to the social marketing campaign was associated with greater use of ORASEL and with significant improvements in perceived availability, knowledge of the signs of diarrhea and dehydration, social support, and self-efficacy.ORS use can be improved through social marketing and educational campaigns that make the public aware of the availability of the product, encourage dialogue about its use, and increase skills and confidence relating to correct product preparation and administration. Further interventions in Burundi and elsewhere should promote ORS through a variety of mass media and interpersonal communication channels, and should be rigorously evaluated in the context of the total market for diarrhea treatment products.Diarrheal diseases are one of the leading causes of mortality among children under the age of five, resulting in 16.7% of infant and child deaths globally [1]. In Burundi, diarrhea is the third leading cause of death for children under five after malaria and pneumonia, according to national health center data [2].According to a Multiple Indicator Cluster Survey (MICS) conducted in 2005, 20.6% of chil
How long is enough to detect terrestrial animals? Estimating the minimum trapping effort on camera traps
Xingfeng Si,Roland Kays,Ping Ding
PeerJ , 2015, DOI: 10.7717/peerj.374
Abstract: Camera traps is an important wildlife inventory tool for estimating species diversity at a site. Knowing what minimum trapping effort is needed to detect target species is also important to designing efficient studies, considering both the number of camera locations, and survey length. Here, we take advantage of a two-year camera trapping dataset from a small (24-ha) study plot in Gutianshan National Nature Reserve, eastern China to estimate the minimum trapping effort actually needed to sample the wildlife community. We also evaluated the relative value of adding new camera sites or running cameras for a longer period at one site. The full dataset includes 1727 independent photographs captured during 13,824 camera days, documenting 10 resident terrestrial species of birds and mammals. Our rarefaction analysis shows that a minimum of 931 camera days would be needed to detect the resident species sufficiently in the plot, and c. 8700 camera days to detect all 10 resident species. In terms of detecting a diversity of species, the optimal sampling period for one camera site was c. 40, or long enough to record about 20 independent photographs. Our analysis of evaluating the increasing number of additional camera sites shows that rotating cameras to new sites would be more efficient for measuring species richness than leaving cameras at fewer sites for a longer period.
麦类作物学报 , 1998, DOI: 10.7606/j.issn.1009-1041.1998.05.097
Abstract: 高脂或高糖谷物产品与其它谷物产品的近红外(NIR)光谱特性大不相同。将利用预处理反射光谱和偏性最小平方分析来预测谷物产品中纤维素的现有NIR模式扩展为两个模式:(1)“脂肪扩展”模式;(2)“脂肪和糖分扩展”模式,脂肪扩展模式可用于分析高脂肪含量产品,脂肪和糖分扩展模式可用于分析高糖和高结晶糖含量的谷物制品。在实验室用AOAC方法991.43分析干燥并磨碎的谷物和籽粒制品,用扫描单色仪收集NIR反射光谱。数据分析和典型高脂与高糖样品的选择,用商品化分析程序进行。两种扩展模式的交叉验证标准误和R2均与现有模式的相近,当用单个验…
Same day colposcopic examination and loop electrosurgical excision procedure (LEEP) presents minimal overtreatment and averts delay in treatment of cervical intraepithelial neoplasia in Kenyatta National Hospital, Kenya  [PDF]
Kays Muruka, Mugo R. Nelly, Wanyoike Gichuhi, Kihara Anne-Beatrice, Cheserem J. Eunice, Kosgei J. Rose
Open Journal of Obstetrics and Gynecology (OJOG) , 2013, DOI: 10.4236/ojog.2013.33058

Background: Screening for cancer of the cervix at Kenyatta National Hospital (KNH), follows the recommended three-step strategy; Papanicolaou (Pap) smear, colposcopy/biopsy and loop electrosurgical excision procedure (LEEP)/biopsy. This approach poses the following challenges: multiple clinic visits, costly, time consuming, long turnaround time to treatment, non-compliance and loss-to-follow-up. Objective: To determine the agreement between histologies following colposcopy and LEEP amongst women in KNH as a forerunner for opportunity to shift from the three-step approach to the two-step “see and treat” (same-day colposcopy and LEEP) approach. Methods: This was a retrospective descriptive cohort of Women who underwent LEEP procedure between January 2008 and 31st December 2010 following the three-step approach at KNH, Kenya. Results: A total of 124 patients out of the 132 patients who underwent LEEP were included in the analysis. The 8 patients excluded had missing files. HIV infected, uninfected or unknown women are similar socio-demographically. The mean (SD) age for the HIV infected, uninfected and unknown is 37 (6), 33 (10) and 35 (9) years respectively. Colposcopic and LEEP biopsy histology within patients demonstrated a high weighted kappa statistics agreement of 84%. LEEP increased diagnosis of invasive cancer. Patients had a median (IQR) 5 (4 - 6) clinic visits from Pap smear to LEEP treatment. It took median (IQR) 55 (27 - 116) days between Pap smear to colposcopy result and

Increasing safer sexual behavior among Lao kathoy through an integrated social marketing approach
Kim Longfield, Xouchai Panyanouvong, Judy Chen, Megan B Kays
BMC Public Health , 2011, DOI: 10.1186/1471-2458-11-872
Abstract: Quantitative surveys were administered in November 2004 (n = 288) and June 2006 (n = 415) using time location sampling at venues where kathoy were known to congregate. Respondents were aged 15-35 and from three urban centers in Laos. UNIANOVA tests were used to compare baseline and follow-up survey data and to evaluate the impact of PSI's kathoy-specific interventions on items that changed significantly over time.Exposure to the intervention was associated with higher levels of condom use at last anal sex with casual partners and greater use of water-based lubricant. Exposure was also linked to improved perceptions of product availability for condoms and water-based lubricant. Knowledge about the importance of consistent condom use improved over time as well as the need to use condoms with regular partners. Some HIV knowledge decreased over time and the intention to use condoms with casual partners when water-based lubricant is available also declined.Study results demonstrate the feasibility of reaching kathoy with an integrated social marketing approach; combining product promotion, peer education, and other types of interpersonal communication. The approach was successful at increasing condom use with casual partners and water-based lubricant use, but the importance of using condoms along with water-based lubricant must be emphasized and modified strategies are required for improving condom use with boyfriends. Future messages should emphasize consistent condom use with all types of partners as well as improve knowledge and correct misconceptions about HIV and AIDS, STIs, condom use, and lubricant use. It is also important that authorities create an enabling environment to support such interventions and help foster behavior change.Laos has one of Southeast Asia's lowest national HIV prevalence rates, with less than 0.2% of the general population aged 15 to 49, or an estimated 6,000 persons, living with HIV [1]. Expansion of the epidemic remains a concern, however
Predispersal home range shift of an ocelot Leopardus pardalis (Carnivora: Felidae) on Barro Colorado Island, Panama
Mares,Rafael; Moreno,Ricardo S; W. Kays,Roland; Wikelski,Martin;
Revista de Biología Tropical , 2008,
Abstract: home range shifts prior to natal dispersal have been rarely documented, yet the events that lead a subadult to abandon a portion of its home range and venture into unfamiliar territories, before eventually setting off to look for a site to reproduce, are probably related to the causes of dispersal itself. here, we used a combination of manual radio-tracking and an automated radio telemetry system to continuously study the movements of a subadult male ocelot (leopardus pardalis), a solitary carnivore with sex-biased dispersal, on barro colorado island, panama, for 18 months from may 2003 through october 2004. the subadult ocelot?s parents were also radio-tracked to record possible parent-offspring interactions within their home ranges. at the age of ca. 21 months the subadult gradually began to shift its natal home range, establishing a new one used until the end of the study, in an area that had previously been used by another dispersing subadult male. only three parent-offspring interactions were recorded during the four months around the time the range-shift occurred. the apparent peaceful nature of these encounters, along with the slow transition out of a portion of his natal home range, suggest the subadult was not evicted from his natal area by his parents. the timing of the shift, along with the subadult?s increase in weight into the weight range of adult ocelots four months after establishing the new territory, suggests that predispersal home range shifts could act as a low risk and opportunistic strategy for reaching adult size, while minimizing competition with parents and siblings, in preparation for an eventual dispersal into a new breeding territory. rev. biol. trop. 56 (2): 779-787. epub 2008 june 30.

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