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Full-Text Articles in Forest Sciences
Breaking The Enzymatic Latch: Impacts Of Reducing Conditions On Hydrolytic Enzyme Activity In Tropical Forest Soils, Steven J. Hall, Jonathan Treffkorn, Whendee L. Silver
Breaking The Enzymatic Latch: Impacts Of Reducing Conditions On Hydrolytic Enzyme Activity In Tropical Forest Soils, Steven J. Hall, Jonathan Treffkorn, Whendee L. Silver
Steven J. Hall
The enzymatic latch hypothesis proposes that oxygen (O2) limitation promotes wetland carbon (C) storage by indirectly decreasing the activities of hydrolytic enzymes that decompose organic matter. Humid tropical forest soils are often characterized by low and fluctuating redox conditions and harbor a large pool of organic matter, yet they also have the fastest decomposition rates globally. We tested the enzymatic latch hypothesis across a soil O2 gradient in the Luquillo Experimental Forest, Puerto Rico, USA. Enzyme activities expressed on a soil mass basis did not systematically decline across a landscape O2 gradient, nor did phenolics accumulate, the proposed mechanism of …
A Response Surface Methodology Study On The Effects Of Some Phenolics And Storage Period Length On Vegetable Oil Quality: Change In Oxidation Stability Parameters, Safa Karaman, Ömer Sai̇d Toker, İsmet Öztürk, Hasan Yalçin, Ahmed Kayacier, Mahmut Doğan, Osman Sağdiç
A Response Surface Methodology Study On The Effects Of Some Phenolics And Storage Period Length On Vegetable Oil Quality: Change In Oxidation Stability Parameters, Safa Karaman, Ömer Sai̇d Toker, İsmet Öztürk, Hasan Yalçin, Ahmed Kayacier, Mahmut Doğan, Osman Sağdiç
Turkish Journal of Agriculture and Forestry
In the present study, response surface methodology was conducted for the determination of effects of some phenolics (gallic acid, ellagic acid, and quercetin) on some stability parameters of mixed oil prepared with sunflower and hazelnut oils (50:50, v/v). In this respect, peroxide value (PV), free fatty acids (FFAs), p-anisidine value, induction period, and refractive index of mixed oil were investigated. Predictive regression equations were constructed for the estimation of each studied parameter (R^2 > 0.861). The storage period caused a significant increase in the peroxide value, FFAs, p-anisidine, and refractive index values of the mixed oil, while it decreased the induction …
Antioxidant And Radical Scavenging Activities In Fruits Of 6 Sea Buckthorn (Hippophae Rhamnoides L.) Cultivars, Otakar Rop, Sezai̇ Erci̇şli̇, Jiri Mlcek, Tunde Jurikova, Ignac Hoza
Antioxidant And Radical Scavenging Activities In Fruits Of 6 Sea Buckthorn (Hippophae Rhamnoides L.) Cultivars, Otakar Rop, Sezai̇ Erci̇şli̇, Jiri Mlcek, Tunde Jurikova, Ignac Hoza
Turkish Journal of Agriculture and Forestry
Sea buckthorn (Hippophae rhamnoides L.) is a minor fruit crop. The most important breeding activities focused on the production of sea buckthorn fruits as a top-quality food product have been performed in Russia, Germany, and the Czech Republic. Over the past several decades, plant breeders have selected a number of cultivars that show excellent physical and nutritional properties. The aim of this study was to monitor and determine the total contents of phenols and flavonoids as well as antioxidant capacity and scavenging activity of methanolic extracts on reactive oxygen species and lipid peroxidation in some cultivars of sea buckthorn suitable …
Methyl Jasmonate Treatments Influence Bioactive Compounds And Red Peel Color Development Of Braeburn Apple, Burhan Öztürk, Yakup Özkan, Kenan Yildiz
Methyl Jasmonate Treatments Influence Bioactive Compounds And Red Peel Color Development Of Braeburn Apple, Burhan Öztürk, Yakup Özkan, Kenan Yildiz
Turkish Journal of Agriculture and Forestry
The present study was carried out to determine the effects of methyl jasmonate (MeJA) treatments on the fruit peel color parameters, anthocyanin content, ethylene biosynthesis, phenolic content, and antioxidant capacity of Braeburn apples. Experimental trees were treated with 1120, 2240, or 4480 mg L-1 MeJA at 1- and 2-week intervals between the 105th and 175th days of growth after full bloom. L* and hue decreased linearly with increasing MeJA concentrations in both experimental years. While MeJA treatments did not cause significant changes in chroma, except for in the final harvest in 2010, it decreased chroma values significantly on all sampling …
Physicochemical Properties Of Turkish Green Tea Powder: Effects Of Shooting Period, Shading, And Clone, Ayhan Topuz, Cüneyt Di̇nçer, Mehmet Torun, İsmai̇l Tontul, Hi̇lal Şahi̇n Nadeem, Ayhan Haznedar, Feramuz Özdemi̇r
Physicochemical Properties Of Turkish Green Tea Powder: Effects Of Shooting Period, Shading, And Clone, Ayhan Topuz, Cüneyt Di̇nçer, Mehmet Torun, İsmai̇l Tontul, Hi̇lal Şahi̇n Nadeem, Ayhan Haznedar, Feramuz Özdemi̇r
Turkish Journal of Agriculture and Forestry
This study aimed to determine the physicochemical properties of the green tea powders produced from 2 different Turkish tea [Camellia sinensis (L.) O.Kuntze] clones (Derepazarı 7 and Fener) grown under different shade levels and harvested during 2 consecutive shooting periods. Moisture, ash, crude fiber, and total phenolic contents of the green tea powders were determined based on the experimental factors. Products were also evaluated for their water activity, bulk density, particle size, color, extraction yield, and antioxidant activity. The shooting period, specific to Turkish tea cultivation, showed remarkable effects on the main quality parameters of the green tea powders. It …