This experiment was carried out during the 2019/2020, 2020/2021 seasons at the Khormaksar-Aden Food Research Centre Laboratory to test the bacterial content in two varieties of seeds of Sorghum bicolor by using the powders of Azadiracta  indica leaves, Capsicum annum result, Acacia tortilis ash and Mineral rocks Which was used in the average (25gm/kg seeds) and different storing tools, mental, plastics, jiut. The laboratory tests were done during 3, 6,9,12 months for two planting seasons and the results were analysed by using the factorial experiment conducted in four times for each operation. For decreasing the bacteriara Xanthomonas sp in the two varieties Sanisalah and Bini ,Azadirachta indica was the best (677,630 cell/gmseeds) respectively ,Capsicum annum (1830,1770 cell/gm seeds) respectively, Acacia tortilis ash (2206,2122.5 cell/gm seeds) respectively, then Volcanic rocks (3354,3270cell/gm seeds) respectively as compared to the Control (4579.5,4510cell/gmseeds) respectively.
For reducing the number of bacteria cells that attack the seeds stored for two season, the best storing containers were metal(615,540 cell/gm seeds) respectively, plastic(1087,1015 cell/gm seeds) respectively ,polyethylene(2618,2535 cell/gm seeds) respectively, then Jute (5797,5700 cell/gm seeds)respectively.
According to this study, the bacterial content of seeds increased during the storing period.

     A field experiment was conducted at educational farm of Nasser's Faculty of Agriculture Sciences – university of Aden – Lahj Governorate, during the two auricular seasons 2014 – 2015 and 2015 – 2016, to study the effect of different of fertilizers and Plows  on the characteristics of crop and its components of (Zea mays  L.) Kanja 36   with 16   treatments , four type of fertilizer ( no fertilization , CYM , urea 110 Kg Nitrogen and FYM), and four tillage systems   i.e. no tillage , tillage with mold board plough ,tillage with disc and tillage with chisel plough). The results showed the Application of different types of fertilizers have been significantly  increased (Cob length , Cob width , Cob weight , number of rows cob،  number of grains per row, weight of grains per Cob, , 1000 Kernel weight, inattention ratio),  while CYM + urea treatment had significant effect on grain yield and husk yield, compared with control one (no fertilization) . Different types of fertilizers had o significant effect on the number of cobs per plant ,The highest values in all apartments under study were observed where CYM + urea  was applied .  and that’s tillage with mold bored disc plough had significant effect an  cob length and different types of plows  mold board , Disk and chisel  had  significant effect on the  width of cob, number of rows per cob, number of  g rain per row cob, 1000 kernel weight.

     This experiment was conducted on the seeds of okra Abelmoschus esculentus (L.) in order to study the effect of soaking seeds for an hour in methyl sulfonate on the germination and concentrations of ethyl different growth of local okra seedlings grown in dishes using cotton, in a special laboratory in Aden in the summer season on 06/29/2021 to2021 / 18 / 07 CE.
The results obtained are as follows:
The response of local okra seeds soaked in different concentrations of ethyl methyl sulfonate showed the study indicators represented by (germination speed) the moral superiority achieved by the control treatment (soaking in water only) over the treatments with the highest concentrations of EMS represented by the following concentrations (0.07%, 0.08%, 0.09 %  and 0.1%).
The treatments that were treated with a low concentration of EMS achieved significant superiority in the percentage of germination, represented by the two treatments EMS concentration (0.02% and 0.03%) over the following treatments (0.00%, 0.8%, 0.09 and 0.1%), while it did not reach the significant level with the rest of the other transactions.
EMS treatment achieved a concentration of (0.02%) moral superiority in the stalk length of okra seedlings over all other treatments.
EMS treatment showed a concentration of (0.03%) significantly superior to all treatments except for the treatment of concentration (0.02%) in the characteristics of root length and leaf area of okra seedlings.

      This study was conducted to confine the growing plants in oil spill locations in Shabwah Governorate in three valleys, viz., (Al- Bataneh, Lehyah, and Ghureir), in which oil spill blow-out from the oil pipeline extending from Ayyad, the oil field, to Nishaimah oil tanks, on the Arab Sea coast. 66 plant species belonging to 62 genera  and 31 plant families were identified. The most widely spread was the Mimosaceae, which included 7 species. The distribution of the plants in the study areas was entirely diverse. In Wadi Al-Bataneh, for instance, there were 54 plant species (35 %), while in Wadi Lehyah there were 43 plant species (28 %), and finally in Wadi Ghureir there were 57 plant species (37%). The vegetation near distance affected with crude oil in all study area.The most common plant species are Acacia tortillis (Forssk.)Hayne ,Prosopis  juliflora ,Tephrosia apollinea (del)link, Dipterygium glaucum Decne.

     The present research includeda comparative epidermal and anatomical Study of the leaflets of six species belonging to the genus Senna.Mill. and growing  in Toor  Al- Baha District, Lahj  Gov., Yemen  viz: 1-S. alexandrina 2-S. holosericea 3-S.italica 4- S. obtusifolia 5-S. occidental 6- S. sophera The study involved the epidermal characters such as the ordinary epidermal cells, stomata and epidermal tricomes ( hairs). The results revealed the occurance  some features which were helpful for the differentiation between  the studied  species such as epidermal cells shape, anticlinal cell walls patterns, stomatal types ,stomatal index and epidermal tricomes, and through which an artificial key was made to identify the studied species.

     Most of Yemeni honey have a locally and internationally Fame. Six of Yemeni honeys were selected according to geographical and floral sources and their fame such as (Osymi sidir, Dawani sidir, Jardai sidir, Salam Tohamah, Somara Shabwah and SSAl Tawr Albahah). Physic- chemical properties were conducted on tri replicate, according to chemical standards methods. The results showed that all honeys were dark color; the mean results were as following: the highest value of pH was 3.71 of SSal Honey, while the least mean value was 5.3 of Sidir honeys; total acidity was on limit for all, the highest value of moisture was found on SSal, whereas Sidir honeys showed the least mean value 13.62; Hydroxylmethaylfurfural (HMF) of all studied honeys were on limit that is less than permitted value 40 mg/100g; Daistase number of all were on permitted limit except Somra honey that showed 6 shade units; values of sugars analysis were found on permitted limit except Somra was 16 g/100g; electrical conductivity of Jardani sidir honey was the highest mean value 1220, while Somra honey had the least value 544; as well as in comparison of total phenolic compound results, Jardani Sidir had the highest mean value 274.3 mg/100g of tannic acid, while Somra had the least mean value 82.01 g/100g of tannic acid. All studied honeys were in conformity to local, regional and international standards except Somra honey that has non-conformity to them.

     This research aims at determining some of the physicochemical properties of hot springs in the areas of (Shara’a and Kirsh) Lahij Governorate. 45 samples were collected for 15 sites. The following parameters were measured: acidity number (pH), total dissolved solids (TDS), electrical conductivity (EC), total hardness (TH), Calcium Hardness (TH.Ca), Magnesium Hardness (TH.Mg), Alkalinity, Calcium (Ca²⁺),  Magnesium (Mg²⁺), Sodium (Na⁺), Potassium (K⁺), Bicarbonate (HCO₃^-), Sulfate (SO₄^2-), Nitrate (NO₃^-), Fluoride (F^-), Chloride, and (Cl^-), Sodium Absorption Ratio (SAR). The results showed that the values of Total Dissolved Solids (TDS), Electrical Conductivity (EC), Alkalinity, Sodium, Potassium, Sulfate and Fluoride were higher than the maximum allowable limits of the World Health Organization (WHO) for drinking water by 100%, while the concentration of Chloride in Krish area and alkalinity in Shara'a area exceeded WHO limits by 100%. As for the rest of the parameters, they were less than the permissible limit according to the standard specifications. Also, the results showed that the water of Shara'a and Kirsh hot springs has temperatures (^oC) of 60 and 62.5 respectively. The waters from the hot springs in Shara'a and Krish are thus not fit for human consumption. The study recommends the use of hot spring water for recreational purposes should be closely monitored. It is thus important that the physical and chemical composition of hot springs should be monitored on a regular basis. Finally, the study recommends a comprehensive study of the chemical and therapeutic properties of hot springs water, as well as the geological characteristics of the study area.

     In this paper, certain new results concerning the maximum modulus of the polar derivative and the generalized polar derivative of a polynomial with restricted zeros are obtained. These estimates strengthen some well known inequalities for polynomial due to Tur n, Rather and Dar, Rather, Ali, Shafi and Dar  and others.  

     Mobile ad-hoc networks (MANETs) are self-organized infrastructure-less network of mobile wireless devices that could be deployed for communication. Due to the insecure wireless communication medium, multi-hop routing communication process, and dynamic behavior of the nodes in MANETs, routing protocols are vulnerable to various security attacks, such as Jellyfish attacks.  A Jellyfish node targets TCP-based MANET and exploits its working mechanism to degrade the communication performance. This attack is hard to detect since it is a TCP protocol compliant methodology.
In this paper, we evaluate the performance of the Ad hoc on-demand vector (AODV), Dynamic source routing (DSR), Temporally ordered routing algorithm (TORA), Geographic routing protocol (GRP), and optimized link state routing (OLSR) routing protocols under the Jellyfish delay variance attacks for TCP-based MANETs. Further, the TAHOE, RENO, and SACK variants of TCP protocol are considered for comparison. These routing protocols are simulated using the OPNET simulator to compare their performance, using specific performance metrics on the network. The experimental results show that the AODV protocol performs better than the DSR, TORA, OLSR, and GRP protocols under the jellyfish delay variance attack. Further, the SACK TCP variant performs better than the other TCP variants under the Jellyfish delay variance attack.

     The present study provides a detailed depiction of the floristic composition of Lawder District which located in the Centre of Abyan between longitudinal range 45º 20¯ to 45º 50¯ E and latitudinal range 13º 00¯ to 14º 00¯ N, with and altitudinal range of 1000 masl to 2500masl. This work was carried out to identify the floristic composition in Lawder District. The floristic study of Lawder District indicated the presence of 243 species belonging to 154 genera and 58 families. The major families based on the number of species were Euphorbiaceae, Apocynaceae, Asteraceae, Poaceae, Fabaceae, Solanaceae, Capparaceae and Boraginaceous, The biological spectrum explains that Chamephytes (35.80%), were the dominant, followed by Therophytes (25.52%, Hemicryptophytes (20.16%), Phanerophytes (14.40 %), Geophytes (2.06%),  parasite (1.65 %), and Epiphytes (0.41`%). The dominance of Chamaephytes and Therophytes reveals a thero-chamaephytic  phytoclimate for the investigated area.
The number of species was higher in the Herbs, which was represented by 52.27% of species, followed by the Shrubs 30.45%, Trees were represented by 13.17%, Lianas were represented by 2.90% and Parasite 1.23%.