Simon Musila, Simon Musila, 陈中正, 李权, Richard Yego, 张斌, Kenneth Otieno Onditi, Immaculate Muthoni, 何水旺, Samson Omondi, James Mathenge, Esther Kioko, 蒋学龙, Zhongzheng Chen, Quan Li, Richard Yego, Bin Zhang, Kenneth Otieno Onditi, Immaculate Muthoni, Shui-Wang He, Samson Omondi, James Mathenge, Esther Kioko, Xuelong Jiang,
The distribution of small mammals in mountainous environments across different elevations can provide important information on the effects of climate change on the dispersal of species. However, few studies conducted on Afromontane ecosystems have compared the altitudinal patterns of small mammal diversity. We investigated the species diversity and abundance of non-volant small mammals (hereafter 'small mammals') on Mt. Kenya, the second tallest mountain in Africa, using a standard sampling scheme. ...
Tópico(s): Animal Ecology and Behavior Studies
2019 - Science Press | 动物学研究
Stephen O. Ojwach, George S. Nyamato, Benard Omondi, James Darkwa, Alexander O. Okoth,
The coordination chemistry and cationic binding properties of 2,6-bis(pyrazol-1-ylmethyl)pyridine (L1), 2,6-bis(3,5-dimethylpyrazol-1-ylmethyl)pyridine (L2), and 2,6-bis(3,5-ditertbutylpyrazol-1-ylmethyl)pyridine (L3) with zinc(II) and cadmium(II) have been investigated. Reactions of L2 with zinc(II) and cadmium(II) nitrate or chloride salts produced monometallic complexes [Zn(NO3)2(L2)] (1), [ZnCl2(L2)] (2), [Cd(NO3)2(L2)] (3), and [CdCl2(L2)] (4). Solid state structures of 1 and 3 confirmed that L2 binds ...
Tópico(s): Crystal structures of chemical compounds
2012 - Taylor & Francis | Journal of Coordination Chemistry
Stephen O. Ojwach, George S. Nyamato, Benard Omondi, James Darkwa,
Reactions of 2-(3,5-dimethylpyrazol-1-ylmethyl)pyridine (L2) and 2-(3,5-ditertbutylpyrazol-1-ylmethyl)pyridine (L3) with either Zn(NO3) or Cd(NO3) produced monometallic complexes [Zn(NO3)2(L2)] (1), [Zn(NO3)2(L3)] (2), [Cd(NO3)2(L2)] (3) and [Cd(NO3)2(L3)] (4). In the solid state structures of complexes 1, 3 and 4, L2 and L3 ligate to the zinc and cadmium atoms in a bidentate fashion. The pyrazolyl compounds 2-(pyrazol-1-ylmethyl)pyridine (L1), (L2) and (L3) were also used as model chelating agents for liquid– ...
Tópico(s): Synthesis and Characterization of Heterocyclic Compounds
2012 - Elsevier BV | Inorganica Chimica Acta
P. A. Aloo, William Ojwang, Reuben Omondi, James Njiru, Dalmas O. Oyugi,
Aquatic weeds may be defined as troublesome or unsightly plants growing in abundance in aquatic situations where they are not wanted. These plants are either adapted to continuous supplies of water or are at least tolerant to waterlogged soil conditions for substantial periods of time. The wide range of adaptation to varying amounts of water, and the impossibility of sharply distinguishing between aquatic and terrestrial environments, makes it difficult to precisely define an aquatic plant. The ...
Tópico(s): Aquatic Ecosystems and Phytoplankton Dynamics
2013 - Edizioni Danaus, Palermo | BIODIVERSITY JOURNAL
Lucy M. Ombaka, Patrick Ndungu, Bernard Omondi, James McGettrick, Matthew L. Davies, Vincent O. Nyamori,
Nitrogen-doped carbon nanotubes (N-CNTs) have been synthesized at 850 °C via a CVD deposition technique by use of three ferrocenyl derivative catalysts, i.e. para-CN, -CF3 and -Cl substituted-phenyl rings. The synthesized catalysts have been characterized by NMR, IR, HR-MS and XRD. The XRD analysis of the para-CF3 catalyst indicates that steric factors influence the X-ray structure of 1,1′-ferrocenylphenyldiacrylonitriles. Acetonitrile or pyridine was used as carbon and nitrogen sources to yield mixtures ...
Tópico(s): Catalytic Processes in Materials Science
2016 - Elsevier BV | Journal of Solid State Chemistry
Micky M. Mwamuye, Edward Kariuki, David Omondi, James Kabii, David Odongo, Daniel Masiga, Jandouwe Villinger,
Ticks are important vectors of emerging and re-emerging zoonoses, the majority of which originate from wildlife. In recent times, this has become a global public health concern that necessitates surveillance of both known and unknown tick-borne pathogens likely to be future disease threats, as well as their tick vectors. We carried out a survey of the diversity of ticks and tick-borne pathogens in Kenya's Shimba Hills National Reserve (SHNR), an area with intensified human-livestock-wildlife interactions, ...
Tópico(s): Mosquito-borne diseases and control
2016 - Elsevier BV | Ticks and Tick-borne Diseases
Michele R. Decker, Shannon N. Wood, S. Rachel Kennedy, Zaynab Hameeduddin, Catherine Tallam, Irene Akumu, Irene Wanjiru, Ben Asira, Benjamin Omondi, James Case, Amber Clough, Richard J. Otieno, Morris Mwiti, Nancy Perrin, Nancy Glass,
Abstract Background Intimate partner violence (IPV) is a leading threat to women’s health and safety globally. Women in abusive relationships make critical decisions about safety and harm reduction while weighing multiple competing priorities, such as safety of children, housing and employment. In many low- and middle-income countries (LMIC), IPV prevention and response services are limited and women lack access to safety planning resources. In high-resource settings, an interactive safety decision ...
Tópico(s): Attachment and Relationship Dynamics
2020 - BioMed Central | BMC Public Health
Michele R. Decker, Shannon N. Wood, Zaynab Hameeduddin, S. Rachel Kennedy, Nancy Perrin, Catherine Tallam, Irene Akumu, Irene Wanjiru, Ben Asira, Ariel Frankel, Benjamin Omondi, James Case, Amber Clough, Richard J. Otieno, Morris Mwiti, Nancy Glass,
Introduction Intimate partner violence (IPV) threatens women’s health and safety globally, yet services remain underdeveloped and inaccessible. Technology-based resources exist, however, few have been adapted and tested in low-resource settings. We evaluate the efficacy of a community-partnered technology solution: culturally and linguistically adapted version of the myPlan app, a tailored safety decision-making and planning intervention, administrated by trained lay professionals. Methods This randomised, ...
Tópico(s): Sexual Assault and Victimization Studies
2020 - BMJ | BMJ Global Health
Pauline Winnie Orondo, Steven Ger Nyanjom, Harrysone Atieli, John I. Githure, Benyl M. Ondeto, Kevin O. Ochwedo, Collince J. Omondi, James W. Kazura, Ming‐Chieh Lee, Guofa Zhou, Daibin Zhong, Andrew K. Githeko, Guiyun Yan,
Abstract Background Malaria control in Kenya is based on case management and vector control using long-lasting insecticidal nets (LLINs) and indoor residual spraying (IRS). However, the development of insecticide resistance compromises the effectiveness of insecticide-based vector control programs. The use of pesticides for agricultural purposes has been implicated as one of the sources driving the selection of resistance. The current study was undertaken to assess the status and mechanism of insecticide ...
Tópico(s): Insect Pest Control Strategies
2021 - BioMed Central | Parasites & Vectors
Frankline K. Keter, Margo Nell, Ilia A. Guzei, Bernard Omondi, James Darkwa,
Oxidation of the pyrazol-1-yldithiocarbamate compounds {[3,5-R 2 C 3 HN 2 CS 2 ] - (R = H, Me} and indazol-1-lydithiocarbamate by iodine produces the sulfur-sulfur coupling compounds {R'C(S)S-S(S)CR'} (R’ = pyrazolyl, 3,5-dimethylpyrazolyl, indazolyl). All compounds were spectroscopically characterised, and, in some cases, structurally characterised. The X-ray structures reveal that these compounds contain a disulfide bridging the pyrazolylthiocarbonyl units. Two of the three disulfide compounds showed very ...
Tópico(s): Quinazolinone synthesis and applications
2009 - SAGE Publishing | Journal of Chemical Research
Tópico(s): Invertebrate Immune Response Mechanisms
2001 - Springer Science+Business Media | Applied Biochemistry and Biotechnology
Akudo Ikpeazu, Amaka Momah-Haruna, Baba Mari, Laura H. Thompson, Kayode Ogungbemi, Uduak Daniel, Hafsatu Aboki, Shajy Isac, Marelize Görgens, Elizabeth Mziray, N'Della N'Jie, Francisca Ayodeji Akala, Faran Emmanuel, Willis Omondi Odek, James Blanchard,
Background The HIV epidemic in Nigeria is complex with diverse factors driving the epidemic. Accordingly, Nigeria's National Agency for the Control of AIDS is coordinating a large-scale initiative to conduct HIV epidemic appraisals across all states. These appraisals will help to better characterize the drivers of the epidemic and ensure that the HIV prevention programmes match the local epidemic context, with resources allocated to interventions that have the greatest impact locally. Currently, ...
Tópico(s): HIV, Drug Use, Sexual Risk
2014 - Public Library of Science | PLoS ONE
James Omondi Outa, Chrispin O. Kowenje, Christof Plessl, Franz Jirsa,
This is the first detailed report on the distribution of Ni, As, Sr and Ag in water, sediments and macrophytes from Lake Victoria, complemented with recent data on the heavy metals Cr, Cu, Zn, Cd and Pb. The study was conducted over an 11-month period at five sites in the Kenyan part of Lake Victoria: four sites in the Winam Gulf influenced by various anthropogenic pressures including a site near Kisumu City, and one in the main lake, perceived to have lesser direct anthropogenic influence. Compared ...
Tópico(s): Heavy metals in environment
2019 - Springer Science+Business Media | Environmental Science and Pollution Research
James Omondi Outa, Chrispin O. Kowenje, Annemariè Avenant‐Oldewage, Franz Jirsa,
Abstract This is the first comprehensive report on the accumulation of Cr, Ni, As, and Ag in the fish species Nile tilapia Oreochromis niloticus and Nile perch Lates niloticus from Lake Victoria, complemented with recent data on Cu, Zn, Cd, and Pb. This also is the first report on Cr, Ni, As, and Ag levels in invertebrates: the shrimp Caridina nilotica , gastropod Pila ovata , and bivalve Mutela bourguignati . The study was conducted at five sites in the Kenyan part of Lake Victoria: four sites in Winam ...
Tópico(s): Water Quality and Pollution Assessment
2020 - Springer Science+Business Media | Archives of Environmental Contamination and Toxicology
James Omondi Outa, Helmut Sattmann, Martina Köhsler, Julia Walochnik, Franz Jirsa,
This study investigated the occurrence of digenean trematode larvae in snails from the Kenyan part of Lake Victoria. The survey included caenogastropod snails that have received less focus in parasitological studies in Africa: their trematodes are largely unknown. Out of 1145 snail specimens, 149 (13.0%) were infected with Digenea. The highest prevalence (P) was recorded in Melanoides tuberculata (64.5%), followed by Pila ovata (15.4%), Radix natalensis (9.5%), Bulinus ugandae (9.1%), Bellamya unicolor ( ...
Tópico(s): Helminth infection and control
2020 - Elsevier BV | Acta Tropica
Martha W. Njoroge, Stephen O. Ojwach, George S. Nyamato, Bernard Omondi, James Darkwa,
The coordination chemistry and binding properties of (3,5-dimethyl-1H-pyrazol-1-yl)ethanol (L1) with Cu(II), Zn(II), Cd(II), and Pb(II) have been investigated. Reactions of L1 with Zn(II) and Cd(II) nitrate or chloride salts produced the corresponding monometallic and bimetallic complexes [Zn(NO3)2(L1)] (1), [ZnCl2(L1)] (2), [Cd(NO3)2(L1)2] (3) and [Cd2Cl2(μ-Cl2)(L1)2] (4). Solid-state structures of 3 and 4 confirmed the bidentate coordination mode of L1. The extraction efficiency of the metals by L1 is dependent ...
Tópico(s): Chemical Thermodynamics and Molecular Structure
2013 - Taylor & Francis | Journal of Coordination Chemistry
Elizabeth Murphy, Stacy Stickney Ferguson, Nancy A. Omondi, Lisa Getzendaner, James Gajewski, Gary Goldstein, John R. Wingard, J. Douglas Rizzo, Navneet S. Mahjail,
Although hematopoietic cell transplantation (HCT) is an effective treatment option for patients with life-threatening blood, immune system, or genetic disorders, many barriers besides a lack of suitably matched donors exist and can have an adverse impact on access and outcomes of HCT. In 2008, the National Marrow Donor Program, through its Office of Patient Advocacy, convened a diverse group of experts and transplantation survivors to identify persistent patient barriers throughout the transplantation ...
Tópico(s): Renal Transplantation Outcomes and Treatments
2009 - Elsevier BV | Biology of Blood and Marrow Transplantation
Navneet S. Majhail, Elizabeth Murphy, Nancy A. Omondi, Pam Robinett, James Gajewski, Charles F. LeMaistre, Dennis L. Confer, J. Douglas Rizzo,
Tópico(s): Renal Transplantation Outcomes and Treatments
2011 - Elsevier BV | Biology of Blood and Marrow Transplantation
Collins Obuah, Bernard Omondi, Kyoko Nozaki, James Darkwa,
The pyrazolylamine ligands, 2-(3,5-dimethyl-1H-pyrazol-1-yl)-N-(pyridin-2-ylmethyl)ethan-amine (L1a), 2-(3,5-di-tert-butyl-1H-pyrazol-1-yl)-N-(pyridin-2-ylmethyl)ethan-amine (L2a), 2-(3,5-dimethyl-pyrazol-1-yl)-ethyl-(1H-pyrrol-2-ylmethyl)-amine (L3a), 2-(3,5-di-tert-butyl-pyrazol-1-yl)-ethyl-(1H-pyrrol-2-ylmethyl)-amine (L4a), were prepared by reducing the corresponding imine compounds L1–L4. L1a–L4a were then reacted with [NiBr2(DME)] to form the nickel complexes, [NiBr2(L1a)] (1), [NiBr2(L2a)] (2), [NiBr2( ...
Tópico(s): Coordination Chemistry and Organometallics
2013 - Elsevier BV | Journal of Molecular Catalysis A Chemical
Edwin O. Ogola, Jandouwe Villinger, Danspaid Mabuka, David Omondi, Benedict Orindi, James M. Mutunga, Vincent Owino, Daniel Masiga,
Small islands serve as potential malaria reservoirs through which new infections might come to the mainland and may be important targets in malaria elimination efforts. This study investigated malaria vector species diversity, blood-meal hosts, Plasmodium infection rates, and long-lasting insecticidal net (LLIN) coverage on Mageta, Magare and Ngodhe Islands of Lake Victoria in western Kenya, a region where extensive vector control is implemented on the mainland. From trapping for six consecutive ...
Tópico(s): Parasite Biology and Host Interactions
2017 - BioMed Central | Malaria Journal
Katelyn M. Brown, Katelyn B. Barker, Ryan S. Wagner, Christopher Ward, Lewis Sitoki, James Njiru, Reuben Omondi, James Achiya, Albert Getabu, R. Michael L. McKay, George S. Bullerjahn,
Abstract The Winam Gulf (Kenya) is frequently impaired by cyanobacterial harmful algal blooms (cHABs) due to inadequate wastewater treatment and excess agricultural nutrient input. While phytoplankton in Lake Victoria have been characterized using morphological criteria, our aim is to identify potential toxin‐producing cyanobacteria using molecular approaches. The Gulf was sampled over two successive summer seasons, and 16S and 18S ribosomal RNA gene sequencing was performed. Additionally, key genes ...
Tópico(s): Marine and coastal ecosystems
2024 - Wiley | Environmental Microbiology Reports
Pascaline Fonteh, Afag Y. F. Elkhadir, Bernard Omondi, Ilia A. Guzei, James Darkwa, Debra Meyer,
Label free impedance technology enables the monitoring of cell response patterns post treatment with drugs or other chemicals. Using this technology, a correlation between the lipophilicity of metal complexes and the degree of cytotoxicity was observed. Au(L1)Cl (1), AuPd(L1)(SC4H8)Cl3 (1a) and Au(L2)Cl (2) [L1 = diphenylphosphino-2-pyridine; L2 = 2-(2-(diphenylphosphino)ethyl)-pyridine] were synthesised, in silico drug-likeness and structure–activity relationship monitored using impedance technology. Dose ...
Tópico(s): Advanced biosensing and bioanalysis techniques
2015 - Springer Science+Business Media | BioMetals
James Omondi Outa, Quinton Marco Dos Santos, Annemariè Avenant‐Oldewage, Franz Jirsa,
Tópico(s): Fish Biology and Ecology Studies
2021 - Springer Science+Business Media | Parasitology Research
Hellen Gatakaa, Elizabeth Ombech, Rogers Omondi, James Otiato, Vincent Waringa, Gordon Okomo, Richard Muga, Moses Ndiritu, Samson Gwer,
Fifteen counties contribute 98.7% of the maternal and newborn morbidity and mortality in Kenya. The dismal maternal and newborn (MNH) outcomes in these settings are mostly attributable to limited access to skilled MNH services. Public health services are stretched and limited in reach, and many social programmes are not sustainably designed. We implemented a network of 16 self-sustaining community medical centres (Ubuntu-Afya Kiosks) in Homa Bay County, to facilitate access to MNH and other primary ...
Tópico(s): Poverty, Education, and Child Welfare
2019 - BioMed Central | BMC Health Services Research
Navneet S. Majhail, J. Douglas Rizzo, Theresa Hahn, S J Lee, Philip L. McCarthy, Monique Ammi, Ellen M. Denzen, Rebecca Drexler, Susan Flesch, H. James, Nancy A. Omondi, Tanya L. Pedersen, Elizabeth Murphy, Kate Pederson,
Tópico(s): Childhood Cancer Survivors' Quality of Life
2012 - Springer Nature | Bone Marrow Transplantation
Ellen M. Denzen, Viengneesee Thao, Theresa Hahn, S. J. Lee, Phillip McCarthy, J. Douglas Rizzo, Monique Ammi, Rebecca Drexler, Susan Flesch, H. James, Nancy A. Omondi, Elizabeth Murphy, Kate Pederson, Navneet S. Majhail,
Hematopoietic cell transplantation (HCT) is a procedure that can significantly influence the socioeconomic wellbeing of patients, caregivers and their families. Among 30 allogeneic HCT recipients and their caregivers enrolled on a pilot study evaluating the feasibility of studying financial impact of HCT, 16 agreed to participate in the long-term phase, completed a baseline questionnaire and received phone interviews at 6, 12, 18 and 24 months post HCT. Analyses showed that by 2 years post HCT, 54% ...
Tópico(s): Economic and Financial Impacts of Cancer
2016 - Springer Nature | Bone Marrow Transplantation
Shahin Sayed, Zahir Moloo, Ronald Wasike, Peter Bird, Raymond Oigara, Faith Wambui Njoroge, Asim Jamal Shaikh, Satya Prasad, Sudhir Vinayak, Gretchen L. Gierach, Sanford M. Dawsey, Maya Palakal, Shaoqi Fan, Maeve Mullooly, Rajendra Chauhan, Patricia Okiro, Samuel Gakinya, Ancent Nzioka, Catherine Kyobutungi, Shukri F Mohamed, Tilahun Haregu, Mustafa Mussajee, Betty Bonass, Costa Mariwa, Omar Sherman, Abdihakim Mohammed, Andrew Gachii, Joseph Githaiga, Joseph Karanu, Robert Nyagah, Richard Njoroge, Irene Muramba, James Otieno, Dan Omondi Raburu, Elizabeth Mwachiro, Innocent Abayo, Mansoor N. Saleh,
There are no published data from specific regions of sub-Saharan Africa describing the clinical and pathological characteristics and molecular subtypes of invasive breast cancer by ethnic group. The purpose of this study was to investigate these characteristics among the three major ethno-cultural groupings in Kenya.The study included women with pathologically confirmed breast cancer diagnosed between March 2012 and May 2015 at 11 hospitals throughout Kenya. Sociodemographic, clinical, and reproductive ...
Tópico(s): Breast Cancer Treatment Studies
2017 - Springer Science+Business Media | Breast Cancer Research and Treatment
John I. Githure, Delenasaw Yewhalaw, Harrysone Atieli, Elizabeth Hemming‐Schroeder, Ming‐Chieh Lee, Xiaoming Wang, Guofa Zhou, Daibin Zhong, Christopher L. King, Arlene E. Dent, Wolfgang R Mukabana, Teshome Degefa, Kuolin Hsu, Andrew K. Githeko, Gordon Okomo, Lilyana Dayo, Kora Tushune, Charles O. Omondi, Hiwot Solomon Taffese, James W. Kazura, Guiyun Yan,
ABSTRACT. Malaria control programs in Africa encounter daunting challenges that hinder progressive steps toward elimination of the disease. These challenges include widespread insecticide resistance in mosquito vectors, increasing outdoor malaria transmission, lack of vector surveillance and control tools suitable for outdoor biting vectors, weakness in malaria surveillance, and an inadequate number of skilled healthcare personnel. Ecological and epidemiological changes induced by environmental ...
Tópico(s): Viral Infections and Vectors
2022 - American Society of Tropical Medicine and Hygiene | American Journal of Tropical Medicine and Hygiene
James Omondi Juma, Ruth Simiyu,
The causes of inter-ethnic conflict are complex as they are deeply rooted into the socio-cultural beliefs of the society. This study was guided by the Primordialism theory. The study employed descriptive research design. The study utilized both primary and secondary data. Data collection was done using questionnaires, interviews and Focus Group Discussions. Data were analyzed using the Statistical Packages for Social Scientists (SPSS 17). Data were presented in tables, bar graphs and pie charts. ...
Tópico(s): Global Political and Social Dynamics
2019 - Scientific Research Publishing | Open Journal of Social Sciences
Asheena Budhai, Bernard Omondi, Stephen O. Ojwach, Collins Obuah, Emmanuel Y. Osei‐Twum, James Darkwa,
Three ligands, 1,2-bis(3,5-dimethylpyrazol-1-ylmethyl)benzene (L1), 1,3-bis(3,5-dimethylpyrazol-1-ylmethyl)benzene (L2) and 1,4-bis(3,5-dimethylpyrazol-1-ylmethyl)benzene (L3), were reacted with either nickel(II) chloride or nickel(II) bromide to produce four nickel complexes, Ni(L1)Br2 (1), Ni(L1)Cl2 (2), Ni(L2)Br2 (3), and Ni(L1)Br2 (4). The complexes were either mononuclear, 1 and 2, or polymeric, 3 and 4, depending on the positions of the pyrazolyl units on the benzene linker in the ligand. This was ...
Tópico(s): Asymmetric Hydrogenation and Catalysis
2013 - Royal Society of Chemistry | Catalysis Science & Technology