Using multi-proxy analysis to determine the long-term impacts of catchment dynamics on water reservoirs - A case from a tropical reservoir (Ruiru Basin Kenya).

Globally, siltation of water reservoirs is a major risk and cost to the provision of fresh water. Therefore, managing reservoir sedimentation is a significant task for water management agencies. In Kenya, the Ruiru water reservoir, one of four water reservoirs supplying Nairobi with drinking water has experienced a significant loss of volume since construction in 1949.

Impact of tent shade on heat exposures and simulated heat strain for people experiencing homelessness.

Concurrent increases in homelessness and heat intensity, duration, and frequency translate to an urban heat risk trap for the unsheltered population. Homelessness is both a driver and consequence of poor health, co-creating distinct geographies with various risk factors that exacerbate heat vulnerability. We tested the efficacy of different tent shadings over identical tents often observed in the Phoenix area (white bedsheet, mylar, tarp, and aluminum foil) and compared them to a control tent (uncovered) and ambient conditions.

Dietary supplement of fermented grass forage regulates growth performance, antioxidant capacity, and immune response of broiler chickens.

The current study aimed to determine the effects of different levels of fermented Juncao grass (FG) on growth parameters, blood constituents, immunity, and antioxidative properties of broilers. A total of 240 (21-d-old) broiler chicks were randomly distributed to four dietary treatments of sixty birds, with six replicate pens and ten birds in each. Fermented grass was added to the basal diet at four levels with 0, 5, 10, and 15% FG.

Sheltered from the heat? How tents and shade covers may unintentionally increase air temperature exposures to unsheltered communities.

Objective: Heat vulnerability and homelessness are central public health concerns in cities globally, and public health implementation should address these two challenges in tandem to minimize preventable heat-related morbidity and mortality. Populations facing unsheltered homelessness use tents (or similar shelters) with shading features to minimize sun and heat exposure. This study evaluates the efficacy of different tent cover (shading) materials and how they moderate the in-tent air temperature (T) exposures of tent users during extreme summer conditions.

Resilience of routine childhood immunization services in two counties in Kenya in the face of the COVID-19 pandemic.

The recently emerged coronavirus disease 2019 (COVID-19) has caused considerable morbidity and mortality worldwide and disrupted health services. We describe the effect of the COVID-19 pandemic on utilization of childhood vaccination services during the pandemic. Using a mixed methods approach combining retrospective data review, a cross-sectional survey, focus group discussions among care givers and key informant interviews among nurses, we collected data between May and September 2021 in Mombasa and Nakuru counties.

Rhizosheath: An adaptive root trait to improve plant tolerance to phosphorus and water deficits?

Drought and nutrient limitations adversely affect crop yields, with below-ground traits enhancing crop production in these resource-poor environments. This review explores the interacting biological, chemical and physical factors that determine rhizosheath (soil adhering to the root system) development, and its influence on plant water uptake and phosphorus acquisition in dry soils. Identification of quantitative trait loci for rhizosheath development indicate it is genetically determined, but the microbial community also directly (polysaccharide exudation) and indirectly (altered root hair development) affect its extent.

Weighting mechanics and the spatial pattern of composite metrics of heat vulnerability in Atlanta, Georgia, USA.

This study constructs two biophysical metrics; one based on Land Surface Temperatures (LST) and an integrated spectral index. The latter is an aggregate of Normalized Difference Vegetation Index (NDVI), Normalized Difference Bareness Index (NDBaI), Normalized Difference Water Index (NDWI), and Normalized Difference Built-up Index (NDBI). The goal is to determine how disparate weighting techniques, data transformation approaches, and spatial visualization pathways influence the computation of composite heat metrics.

Abscisic Acid Mediates Drought-Enhanced Rhizosheath Formation in Tomato.

The rhizosheath, commonly defined as soil adhering to the root surface, may confer drought tolerance in various crop species by enhancing access to water and nutrients under drying stress conditions. Since the role of phytohormones in establishing this trait remains largely unexplored, we investigated the role of ABA in rhizosheath formation of wild-type (WT) and ABA-deficient () tomatoes. Both genotypes had similar rhizosheath weight, root length, and root ABA concentration in well-watered soil.

Phosphorus uptake is associated with the rhizosheath formation of mature cluster roots in white lupin under soil drying and phosphorus deficiency.

Phosphorus (P) deficiency largely restricts plant growth and lead to severe yield losses. Therefore, identification of novel root traits to improve P uptake is needed to circumvent yield losses. White lupin (Lupinus albus) is a legume crop that develops cluster roots and has the high phosphorus use efficiency in low P soils.

Mini review: Advances in understanding regulation of cellulase enzyme in white-rot basidiomycetes.

White-rot basidiomycetic fungi have gained a lot of scientific attention in recent years owing to their ability to produce cellulase enzymes that are of great importance in numerous industrial applications. This has seen a rise in number of studies seeking to comprehend both physical and molecular mechanisms that regulate the production of cellulase enzymes in these fungi. Cellulase has several applications in production of food and beverages, biofuel, biological detergents, pharmaceuticals, and deinking in paper and pulp industry.

In Vitro Regeneration Potential of White Lupin ) from Cotyledonary Nodes.

The tissue culture regeneration system of has always been considered as recalcitrant material due to its genotype-dependent response and low regeneration efficiency that hamper the use of genetic engineering. Establishment of repeatable plant regeneration protocol is a prerequisite tool for successful application of genetic engineering. This aim of this study was to develop standardized, efficient protocol for successful shoot induction from cotyledonary node of white lupin.

Female Genital Mutilation/Cutting: Innovative Training Approach for Nurse-Midwives in High Prevalent Settings.

Background: Female genital mutilation/cutting (FGM/C) has no medical benefits and is associated with serious health complications. FGM/C including medicalization is illegal in Kenya. Capacity building for nurse-midwives to manage and prevent FGM/C is therefore critical.

Microstructured FBG hydrogen sensor based on Pt-loaded WO.

Hydrogen gas sensing properties of Pt-WO films on spiral microstructured fiber Bragg grating (FBG) has been demonstrated. Pt-WO film was prepared by hydrothermal method. The spiral microsturctured FBG was fabricated using femtosecond laser.

A Low Frequency FBG Accelerometer with Symmetrical Bended Spring Plates.

To meet the requirements for low-frequency vibration monitoring, a new type of FBG (fiber Bragg grating) accelerometer with a bended spring plate is proposed. Two symmetrical bended spring plates are used as elastic elements, which drive the FBG to produce axial strains equal in magnitude but opposite in direction when exciting vibrations exist, leading to doubling the wavelength shift of the FBG. The mechanics model and a numerical method are presented in this paper, with which the influence of the structural parameters on the sensitivity and the eigenfrequency are discussed.

Micro-structured femtosecond laser assisted FBG hydrogen sensor.

We discuss hydrogen sensors based on fiber Bragg gratings (FBGs) micro-machined by femtosecond laser to form microgrooves and sputtered with Pd/Ag composite film. The atomic ratio of the two metals is controlled at Pd:Ag = 3:1. At room temperature, the hydrogen sensitivity of the sensor probe micro-machined by 75 mW laser power and sputtered with 520 nm of Pd/Ag film is 16.

Factors influencing uptake of contraceptive implants in the immediate postpartum period among HIV infected and uninfected women at two Kenyan District Hospitals.

Background: Family planning is a cost effective strategy for prevention of mother to child transmission of HIV and reduction of maternal/infant morbidity and mortality. Contraceptive implants are a safe, effective, long term and reversible family planning method whose use remains low in Kenya. We therefore set out to determine and compare the uptake, and factors influencing uptake of immediate postpartum contraceptive implants among HIV infected and uninfected women at two hospitals in Kenya.

Medium-high frequency FBG accelerometer with integrative matrix structure.

To meet the requirements for medium-high frequency vibration monitoring, a new type fiber Bragg grating (FBG) accelerometer with an integrative matrix structure is proposed. Two symmetrical flexible gemels are used as elastic elements, which drive respective inertial mass moving reversely when exciting vibration exists, leading to doubling the wavelength shift of the FBG. The mechanics model and a numerical method are presented in this paper, by which the influence of the structural parameters on the sensitivity and eigenfrequency is discussed.

Study protocol for promoting respectful maternity care initiative to assess, measure and design interventions to reduce disrespect and abuse during childbirth in Kenya.

Background: Increases in the proportion of facility-based deliveries have been marginal in many low-income countries in the African region. Preliminary clinical and anthropological evidence suggests that one major factor inhibiting pregnant women from delivering at facility is disrespectful and abusive treatment by health care providers in maternity units. Despite acknowledgement of this behavior by policy makers, program staff, civil society groups and community members, the problem appears to be widespread but prevalence is not well documented.

Goals and activities proposed by countries in seven regions of the world toward prevention of unsafe abortion.

This article describes the goals and activities included in the national plans of action for the prevention of unsafe abortion. With broad variability, all were in line with the initiative's purpose of contributing to reduce the number of women who have unplanned pregnancies and induced abortions, as well as the maternal mortality and morbidity associated with unsafe abortion. The interventions proposed can be classified in 5 groups: (1) to work toward better national policies through obtaining and disseminating accurate evidence-based data on abortion and to sensitize policy makers and health professionals on issues pertaining to unsafe abortion; (2) to reduce the number of unplanned/unwanted pregnancies by increasing the use of modern contraceptive methods, introducing or improving sex education, and improving adolescent-friendly reproductive health services; (3) to make induced abortion safer by making adequate abortion services available, within the full extent of the national laws, and promoting access to safe abortion; (4) to improve postabortion care, including postabortion contraception; and (5) to reduce the need to resort to abortion by working on facilitating the process of adoption.

Comparative acceptability of combined and progestin-only injectable contraceptives in Kenya.

Objective: We compared 12-month continuation rates, menstrual bleeding patterns and other aspects of acceptability between users of Cyclofem and users of Depo-Provera.

Methods: The life-table method was used to calculate quarterly continuation rates. In all, 360 Kenyan women were randomly assigned to one of the two contraceptives.